• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The snow melting apparatus comprises a melting tank (10) for melting snow, melting means for melting snow in the melting tank into melting water, the melting means comprising a liquid circulating initial melting circuit, a post-melting circuit for circulating melt water in The heat exchanger assembly further includes a second heat exchanger (35b) such that the first heat exchanger is arranged to heat the melt water recycled in the after-melting circuit and the second heat exchanger is arranged to heat the liquid recyclable in the initial melting circuit. In the method, snow is melted with snow melting equipment connected to the district heating network.
    公开号:FI20205554A1
    申请号:FI20205554
    申请日:2020-05-28
    公开日:2021-04-30
    发明作者:Pekka Purola
    申请人:Lumipower Oy；
    IPC主号:
    专利说明:

    FIELD OF THE INVENTION a heat exchanger assembly to be connected to a single heat source, wherein the heat exchanger assembly has a first heat exchanger.
    The invention further relates to a method for melting snow with a snow melting apparatus.
    Background Art Snow in winter makes it difficult to navigate streets and roads as well as courtyards.
    To enable movement, the snow is plowed from the areas to be served and stored on small yards.
    In densely built-up areas, such as cities and residential suburbs, there is often no storage space for snow, which means that the snow has to be transported by trucks to separate snow dumps.
    The transport distance from the snow collection site to the snow removal site is typically several kilometers.
    Transporting snow - generates transport costs and emissions that are harmful to the climate.
    In addition, snow trucks slow down other traffic.
    One way to reduce snow transportation costs is to melt the snow into water, which is discharged into a rainwater drain after cleaning.
    F1123033 B and F120145732 describe equipment for melting snow.
    The equipment comprises a heat-treated N 25 tank into which the snow to be melted is transferred.
    Inside the tank there are pipes N in which the flowing water is heated by a heat exchanger connected to the district heating network, whereby the snow in the tank melts into water.
    FI123033 B discloses the connection of the equipment to the inlet piping of the district heating network, whereby the price of the thermal energy used by the equipment is in accordance with the normal selling price of the district heating. 3 30 Melting snow with such equipment is therefore expensive.
    Publication O F120145732 discloses that the apparatus would be connected to the return pipe of the district heating network, whereby the thermal energy used by the apparatus could possibly be priced more advantageously.
    The temperature of the water flowing in the district heating return pipe is clearly lower than the water temperature in the inlet pipe, which limits the melting capacity of the equipment.
    It is an object of the invention to provide a snow melting apparatus with which the drawbacks associated with the prior art can be eliminated. The objects of the invention are achieved by a snow melting apparatus characterized by what is set out in the independent claim. Some preferred embodiments of the invention are set out in the dependent claims. SUMMARY OF THE INVENTION The snow melting apparatus of the invention comprises a melting tank for melting snow, melting means for melting snow in a melting tank into melting water, the melting means comprising a liquid circulating initial melting circuit, at least , wherein the heat exchanger assembly has a first heat exchanger. The heat exchanger assembly further includes a second heat exchanger such that the first heat exchanger is arranged to heat the melt water recycled in the after-melting circuit and the second heat exchanger is arranged to heat the liquid recyclable in the initial melting circuit. In a preferred embodiment of the snow melting apparatus according to the invention, said initial melting circuit comprises an initial melting tube which is at least partly of its length inside the melting tank. Alternatively or in addition, the initial defrost circuit may be - arranged at least partially inside the wall and / or bottom of the defrost tank. In another preferred embodiment of the snow melting apparatus according to the invention, said after-melting circuit comprises a circulating pipe and a collecting pipe for conducting melt water from the melt tank to the first heat exchanger and N manifolds and at least one
    O 2 Another preferred embodiment I of a snow melting apparatus according to the invention comprises a first inlet connection for connection to a first heat source, a second inlet connection for connection to a second heat source and a return connection 3 for connection to a first or second heat source. Preferably, the first heat source is a district heating pipe return pipe and the second heat source S is a district heating pipe inlet pipe, wherein the first inlet connection is connectable to the district heating pipe return pipe, the second inlet connection is connectable to the district heating pipe inlet pipe and the return pipe is connected to the district heating pipe.
    Yet another preferred embodiment of the snow melting apparatus according to the invention comprises a first pipe leading from the first inlet through the first heat exchanger to the return and a second pipe leading from the second inlet to the first pipe, the inlet and the pipe section between the first heat exchanger.
    In another preferred embodiment of the snow melting apparatus according to the invention, the first pipe, the pipe section between the first inlet connection and the junction of the second pipe has a first control valve and the second pipe has a third control valve.
    Another preferred embodiment of the snow melting apparatus according to the invention comprises a third pipe leading from the first pipe, the pipe section between the second pipe connection point and the first heat exchanger through the second heat exchanger to the first pipe, to the pipe section between the first heat exchanger and the return connection.
    In the method of the invention for melting snow with a snow melting apparatus connected to at least one heat source and having a melting tank, melting snow is metered into the melting tank, melting the snow in the melting tank The melt water recycled in the after-melting circuit is heated by the first heat exchanger and the liquid recycled in the initial melting circuit is heated by the second heat exchanger.
    In a preferred embodiment of the method, the snow melting device o is connected to the first heat source with a first inlet connection, to the second heat source with a second inlet connection O 25, a lower limit temperature water is supplied to the snow melting apparatus from both the first heat source and the second heat source. Preferably, the snow melting device is connected with a first inlet connection to the return pipe of the district heating pipeline, with a second inlet connection to the inlet pipe of the district heating pipeline and on the return connection to the return pipe of the district heating pipeline N. The return pipe of the district heating pipeline then acts as the first heat source and the inlet pipe of the district heating pipeline acts as the second heat source.
    In another preferred embodiment of the method, a target temperature is set for the water supplied to the first heat exchanger and / or the second heat exchanger, the temperature of the water supplied to the first heat exchanger (35a) and / or the second heat exchanger is measured and the amount of water from the first supply and second to maintain the measured temperature substantially at the target temperature. In another preferred embodiment of the method, water is supplied to the snow melting equipment only from the return pipe of the district heating pipeline if the temperature of the water flowing from the return pipe of the district heating pipeline to the snow melting equipment exceeds the lower limit temperature. The advantage of the invention is that it is able to melt a large amount of snow in a short time with the lowest possible energy. BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described in detail. In the description, reference is made to the accompanying drawings, in which Figure 1 shows an example of a snow melting apparatus according to the invention seen from above, Figure 2a shows an example of the apparatus shown in Figure 1 in longitudinal cross-section, Figure 2b shows the apparatus of Figure 1 in Figure 2; N mixing means included in the apparatus in longitudinal cross - sectional view; and
    Fig. 3 shows the apparatus according to the invention in a simplified diagrammatic view. 00 - Detailed description of the invention a a + 25 - Figure 1 shows by way of example an apparatus according to the invention seen from above. The apparatus comprises a box-shaped melting tank 10 made of steel, preferably stainless steel, with a watertight wall
    O N me. The wall comprises a base 12, a front wall 14 and a rear wall 16 and first and second side walls 13, 15. The free edges of the front and rear walls and the side walls - define an opening through which snow can be transferred inside the melting tank. Melting-
    the container further includes an openable lid 22 attached from one edge to the other side wall. The lid can be turned to a closed position in which it substantially completely covers the opening delimited by the free edges of the front and rear walls and side walls, and to an open position in which it has moved away from the front of the said opening. 5 The bottom, front and rear walls, side walls and / or cover may have a thermal insulation layer made of, for example, polystyrene or polyurethane. The size of the defrost tank can be suitably selected according to the amount of snow to be treated. The size of the melting tank of the mobile equipment shown in Figure 1 may be, for example, 25 m . At the first end of the defrost tank, on the other side of the front wall 14, there is a technical space 38. The technical space is a closed space with double doors opening to the end of the equipment.
    40. Within the prior art is a heat exchanger assembly 35, a first circulating water pump 29 for pumping hot water from the district heating network to the heat exchanger assembly 35, and a second circulating water pump 31 and a third circulating water pump 33 for circulating melt water in the apparatus. The heat exchanger assembly 35 has a first inlet 42a, a second inlet 42b and a return 46 for connection to the district heating network piping as described below such that hot water flows from the district heating network through the inlets to the heat exchanger and cooled water flows back through the return. In the technical mode, there is also an automatic control unit 47 for controlling the operation of the devices included in the equipment. The snow melting apparatus further includes a conveyor 28 having a first portion within the melting tank 10 and a second portion outside the melting tank. The rear wall 16 of the melting tank has an outlet 30 through which the conveyor passes. The snowmelt equipment is built in the form of a mobile container. S 25 - Fig. 2a shows by way of example the apparatus shown in Fig. 1 in a longitudinal cross-sectional view N, and Fig. 2b shows a cross-sectional view 3 at the section plane A-A. In the following, both images will be described simultaneously. E At the bottom of the melting tank 10 there is a stainless steel initial melting tube x 30, the ends of which pass through the first and second side walls to the sides of the melting tank 3 and further into the technical space 38. Inside the melting tank, the initial melting tube N bottom 12. In the prior art, the ends of the initial defrost tube are connected to the heat exchanger assembly 35 so that the initial defrost tube forms a closed initial defrost circuit passing through the heat exchanger assembly 35, where the water is circulated by a second circulating water pump 31 (Figure 3). The initial melting tube forms the first melting means by which the snow transferred to the melting tank is melted into melting water. There may be an electrically operated heating cable inside the pre-defrost pipe to prevent water from freezing inside the pre-defrost pipe during equipment outages (the heating cable is not shown in the figures). In addition, there are other melting means inside the melting tank, which raise the temperature of the melting water and lead the heated melting water to the still unmelted snow in the melting tank. The second defrosting means comprise circulating pipes 37, the first ends of which open into the defrosting tank and the second ends connect via a collector pipe 37a (Fig. 3) to a heat exchanger assembly 35. The collector pipe passes through a heat exchanger assembly. The heated melt water exits the heat exchanger to a manifold 32a (Figure 3), from which a plurality of after-melt pipes 32 branch. The after-melt pipes are straight pipes located inside the melt tank on the first and second side walls. - The collector pipe 37a has a third circulating water pump 33 (Fig. 3) for pumping melt water from the lower part of the melt tank along the circulation pipes and the collector pipe to the heat exchanger assembly 35 and from the heat exchanger assembly through the manifold 32a and after-melt pipes 32 to the melt tank. The snow melting apparatus shown in the figures has two circulating tubes 37 on each long side of the melting tank and - two circulating tubes at the front end of the melting tank. The ends of the circulating pipes on the sides of the melting tank open into the side walls 13, 15 of the melting tank and the circulating pipes at the front end of the melting tank open into the front wall 14 near the bottom of the melting tank 12. When a snow melting apparatus is used, there is meltable snow inside the melting tank, whereby the heated melting water jet coming through the nozzles is directed towards the melting snow from many directions.
    O 2 The front wall 14 of the melting tank has mixing means by means of which the melting water inside the melting tank and the snow and ice clumps floating therein are moved - 30 - inside the melting tank 10. The mixing means comprises a supply pipe 18, the imaginary central axis of which is substantially parallel to the direction of the bottom, i.e. it S is substantially horizontal when the melting device is in its operating position S on a substantially horizontal base. The structure of the mixing means will be described in more detail in connection with the description of Figure 2c.
    The snow melting apparatus further includes a conveyor 28 having an inner portion inside the melting tank 10 and an outer portion outside the melting tank. The first end of the inner portion of the conveyor extends almost to the front wall 14. The obliquely rising outer portion of the conveyor begins at one end of the bottom inner portion and rises through the outlet 30 in the second end wall 16 to the outside of the melting tank. The other end of the conveyor is outside the melting tank at the height of the upper edge of the melting tank wall. The outer surface of the second end wall 16 has a waterproof protective trough 52 surrounding the outer portion of the conveyor. and substantially perpendicular to the base 12. The distance between the lower parts of the side walls is equal to the distance between the opposite side walls of the protective trough and less than the distance between the upper parts of the side walls. The first chain is arranged inside the melting tank next to the lower part of the first side wall 13 and the second chain is arranged next to the lower part of the second side wall 15. The lower parts of the side walls and the side walls of the protective trough have rails (not shown) along which the chains run. The chains are connected to each other by beams 56 transverse to the longitudinal direction of the conveyor. The mutual distance between the beams is about 50 cm. The end roller at the other end of the conveyor has a motor for rotating the end roller. As the end roller rotates, the chains rotate around the end rollers so that the upper portion of the chain moves toward the front wall 14 and the lower portion of the chain moves away from the front wall. The conveyor is mounted on the side walls so that as the chains rotate, the beams attached to the chains and moving away from the front wall run very close to the bottom of the melting tank, pushing the heavier water accumulating to the bottom and the inclined wall surface towards the other end of the conveyor. O The initial defrost tube 34 is within the defrost tank 10 near the bottom 12 so that the conveyor beams 56 move toward the front wall as it passes above the initial melt tube and away from the front wall as it passes below the initial melt tube.
    N E 30 - Between the upper and lower parts of the side walls there is a central part which is inclined in position + to the upper and lower part of these. The sloping central portions O of the sidewalls of the melt tank direct heavier contaminants than the water in the snow to be melted, such as sandblasting S, to the bottom of the melt tank, from where they travel outside the melt tank as the conveyor rotates. The width of the conveyor is dimensioned so that the beams - extend from the lower part of the first side wall to the lower part of the second side wall.
    Each side wall 13,15 of the melting tank has an overflow pipe 48 in a position substantially perpendicular to the base 12, the upper end of which opens inside the melting tank. The oblique central parts of the side walls have recesses 64 in which the overflow pipes are placed. The overflow pipes are connected at their lower end to an outlet pipe 62 (Fig. 2b) outside the melting tank. The distance of the first end of the overflow pipe from the bottom can be, for example, 100 cm, in which case - the water volume is 9-10 m3. Around the first end of the overflow pipe is a protective frame 50 which prevents snow floating on the surface of the melt water and leaves access to the overflow pipe.
    Figure 2c shows, by way of example, the mixing means belonging to the snow melting apparatus according to the invention in a longitudinal cross-sectional view. The mixing means includes a feed tube 18 attached at its first end to the front wall 14 of the melting tank such that the imaginary central axis of the feed tube is substantially perpendicular to the plane of the front wall. The feed pipe is shown in the figure in a longitudinally split cross-sectional view. The other end of the supply pipe is open and points towards the rear wall of the defrost tank. The distance of the central axis of the supply pipe from the bottom of the mixing tank can be 500-600 mm. The diameter of the supply pipe can be 15-50 cm, preferably 20-30 cm. The length of the supply pipe can be 25-60 cm, preferably 30-50 cm. The wall of the first end of the supply pipe has an inlet 19 through which melt water can flow into the supply pipe.
    Inside the N supply pipe there is a shaft 20, the longitudinal direction of which is substantially the same as the direction of the central axis of the N supply pipe 18. The shaft has a first end facing the rear wall of the melting tank <Q and a second end extending through a hole in the front wall and extending to the technical space 38. At the other end is a motor (E 30), not shown, by means of which the shaft is rotated. The outer surface of the shaft has a propeller 21 with four + blades. The propeller blades are oriented S so that the rotation of the shaft causes the propeller attached to it to form a flow inside the supply pipe, which pushes the melt water in the supply pipe through the open other end of the supply pipe out of the supply pipe. In place of the melt water leaving the supply pipe, melt water flows inside the supply pipe through the inlet.
    ta.
    The rotating propeller thus generates a flow of melting water inside the melting tank from the supply pipe towards the rear wall of the melting tank, which mixes the melting water with the snowflakes floating in the melting water.
    Inside the shaft there is a flow channel 24, the first end of which opens through the flow holes 25 at the first end of the shaft to the outer surface of the shaft.
    The other end of the flow channel opens through the other end of the shaft to the technical space, where it connects to the connecting pipe 86 supplying heated melt water from the heat exchanger (Fig. 3). The connecting pipe has a shut-off valve 84, by means of which the flow of melt water into the flow channel can be prevented.
    When the apparatus is operated, heated - melt water is pumped from the heat exchanger assembly along manifolds 32a to a flow channel where it discharges through flow holes into the supply pipe and mixes with the rotating propeller flow melt water stream, raising the flow temperature.
    The elevated temperature of the melt water flow promotes the melting of the snow clumps that hit the flow. - Inside the shaft there is further an air duct 26, the first end of which opens through the air holes 27 at the first end of the shaft to the outer surface of the shaft.
    The other end of the air duct opens through the other end of the shaft to the technical space, where it connects to the compressed air pipe coming from the compressor. (compressor and compressed air pipe not shown). When using the equipment, compressed air can be led to the air duct, from where it discharges through air holes into the supply pipe and mixes with the flow of melt water formed by the rotating propeller.
    The compressed air causes the melt water flow to effervesce, which is believed to contribute to the disintegration of the snow clumps that hit the flow into smaller parts.
    The air duct is not a necessary part of the mixing means, but the mixing equipment can also be implemented without it.
    S 25 - Figure 3 shows an apparatus according to the invention in a simplified diagrammatic view.
    The heat exchanger assembly 35 of the apparatus comprises a first heat exchanger 35a and a second heat exchanger 35b.
    The assembly has two inlet units for conducting hot water from the district heating network inside the heat exchanger assembly I and one return connection 46 for returning water circulating through the heat exchanger assembly to the district heating network.
    The first inlet 3a 42a is designed to be connected to the district heating network return pipe 102 and the second inlet connection is designed to be connected to the district heating network inlet pipe 100. S The equipment return connection is designed to be connected to the district heating network return pipe.
    keen.
    Inlet pipe here means a pipe in a district heating network with current
    - hot water from a district heating plant and return pipe means a pipe carrying partially cooled water returning to the district heating plant.
    Return-
    the temperature of the water flowing in the pipe is thus clearly lower than the temperature of the water flowing in the inlet pipe.
    The heat exchanger assembly has a first pipe 80 starting from the first inlet 42a, circulating through the first heat exchanger 35a and ending at the return connection 46. The pipe section between the first inlet 42a and the first heat exchanger has a first circulating water pump 29, a first control valve 66 and a first thermometer 70. and the pipe section between the return connection has a second thermometer 71 and a second control valve 67. The assembly further includes a second pipe 81 starting from the second inlet 42b and joining the first pipe 80 to the pipe section between the first valve and the first thermometer. The second tube has a third control valve 68. The assembly further includes a third tube 82 that branches off from the first tube, circulates through the second heat exchanger 35b, and reconnects to the first tube. The branch point of the third pipe is in the pipe section between the first thermometer 70 and the first heat exchanger 35a and the connection point in the pipe section between the second control valve 67 and the return connection 46. The third pipe has a third thermometer 73 and a fourth control valve 69 located on the pipe section between the second heat exchanger 35b and the connection point to the first pipe.
    In the snow melting apparatus, the initial melting tube 34 circulates through the second heat exchanger 35b, i.e. the water flowing in the initial melting circuit is heated by the second heat exchanger. The temperature of the water in the initial melting tube is measured by a fourth thermometer 74 in the initial melting tube and the water is circulated in the initial melting tube by a first circulating water pump 29. through back to the melting tank 10. The melt water circulating inside the melting tank, i.e. the water recirculated in the after-melting circuit, is thus heated by means of N first heat exchangers 35a. Melt water flowing through the first heat exchanger E 30 is circulated by a third circulating water pump 33. Melt water is discharged from the melt tank via an outlet pipe 62. 3 The heating of the water recycled in the initial melting tube requires less heat energy than the heating of the melt water recycled through the after-melting tubes and the mixer, so that the second heat exchanger can be clearly less efficient than the first heat exchanger. The first heat exchanger may have a capacity of 5 MW and the second heat exchanger may have a capacity of 0.5 MW.
    The snow melting apparatus according to the invention is operated by means of an automatic control unit 47 (Fig. 1) as follows. When the system is started, the control unit starts the first circulating water pump 29, whereby the water coming from the return pipe 102 of the district heating network starts circulating through the heat exchangers 35a, 35b. The temperature of the water returning from the second heat exchanger is measured by a third thermometer 73 and the flow is regulated by a fourth control valve 69. The control valve is used to keep the return water temperature at the desired setpoint. The setting value is preferably 30 ° C. The control unit starts the second circulating water pump 31, whereby the water starts to circulate in the initial defrost pipe 34. The control system allows the lid 22 to be opened, so that the snow to be melted can be transferred inside the defrost tank 10. The snow transferred inside the melting tank begins to melt under the influence of the heat of the initial melting tube, whereupon melting water begins to accumulate in the melting tank. Inside the melting tank, there are means for measuring the melt water level not shown in the figures, and the control unit is pre-set with surface height thresholds. The thresholds can be adjusted to the desired level. The first threshold value may be 35% and the second value 70% of the maximum value of the melt water level, which is determined by the height of the first end of the overflow pipe. When the melt water level reaches the first threshold, the control unit starts the third circulating water pump 33, whereby the melt water starts to flow from the melt tank 10 through circulating pipes 37 and collector pipes 37a to the first heat exchanger 35a, from where it returns heated When the melt water level reaches the second threshold, the control unit opens the shut-off valve 84 and starts the mixing means. The melt water heated by the first heat exchanger then starts to flow back into the melt tank also through the mixer. N During operation of the system, the temperature of the water returning from the first heat exchanger to the district heating network is measured by a second thermometer 71 and the flow N in the first pipe is controlled by a second control valve 67 so that the temperature E30 - remains at the desired value. The aim is that the difference between the temperature of the water + from the district heating network (measured by the first thermometer 70) and the temperature of the water returning to it remains at the desired level.
    O O If the temperature of the water from the district heating network return pipe 102 measured by the first thermometer 70 drops below 40 ° C, the control unit opens the third control valve 68 and reduces the first control valve 66. In the first pipe 80, the district heating
    takes 100 hotter water flowing along the second pipe 81, whereby the temperature of the district heating water flowing through the heat exchangers rises. The control system adjusts the first and third control valves so that the temperature of the water flowing in the first pipe, measured by the first thermometer 70, remains at the desired level, preferably at about 50 ° C. The rotational speed of the first circulating water pump 29 is adjusted simultaneously in order to successfully combine the flows coming along the first pipe and along the second pipe. When the operation of the snow melting equipment is stopped, the control unit switches off the third circulating water pump 33, whereby the circulation of the melting water in the melting tank ceases. If the third control valve 68 is open in the stop position, then it is closed. During the interruption, the second circulating water pump 31 is kept running, whereby the set basic temperature remains in the melting tank due to the heating effect of the initial melting pipe 34. The basic temperature can be set to e.g. 10 * C, which ensures that the water in the defrost tank cannot freeze. The control unit adjusts - the third control valve 68 so that a sufficient amount of water from the district heating network flows through the second heat exchanger to heat the water flowing in the initial defrost pipe. If necessary, the control unit adjusts the speed of the first circulating water pump sufficiently to increase the heating capacity of the second heat exchanger. The apparatus according to the invention is transported to a suitable location in the area of the property along the district heating network. The location can be, for example, the yard of a housing association, an industrial plant or a commercial building. The equipment is then connected to the district heating network by connecting the inlet connections 42a, 42b and the return connection 46 of the equipment to the district heating network piping. The overflow pipe 48 of the equipment is connected to the rainwater drain by means of a connecting pipe and the equipment is connected to the electrical network. The hardware is then ready for use. The equipment is used during the winter, when it is raining snow to be removed in N traffic areas. For summer time when there is no snow, N equipment can be moved out of the property area.
    O 2 The fallen snow is collected from the area to be cleaned with snow removal equipment and transferred to the equipment's defrost tank 10. The equipment is used continuously for as long as there is enough snow to be defrosted. In continuous operation, new snow is continuously introduced into the melting tank so that the interior of the melting tank is substantially filled with snow S and melt water. The melt water generated when the snow melts is continuously discharged through an overflow pipe to the rainwater drain. When the snow to be melted runs out, the equipment can be stopped and the melt water left in the melt tank can be discharged to the rainwater drain via a drain valve.
    The equipment shown in the figures is arranged in the form of a container movable by a truck. Embodiments can also be built from the equipment in a fixed manner. The fixed installation may have a melting tank which can be at least partially immersed in the ground. The submersible defrosting tank may have a filling opening extending to the ground surface and closed by an openable lid.
    The snow melting apparatus and method according to the invention is particularly well suited for melting snow with thermal energy produced in a district heating plant, so that the return pipe of the district heating pipeline acts as the first heat source and the inlet pipe of the district heating pipeline acts as the second heat source. However, the invention is not limited to the use of district heating as a heat source, but the first and / or second heat source can be, for example, a geothermal or air source heat pump, a geothermal power plant, a biogas power plant, a solar collector or a burner using fossil or renewable fuel.
    - Some preferred embodiments of the snow melting apparatus according to the invention have been described above. The invention is not limited to the solutions described above, but the inventive idea can be applied in various ways within the limits set by the claims. O OF O OF
    LÖ <Q 00 OF
    I a a + LO LO LO O OF O OF
    Reference number list: - defrost tank 46 return connection 12 bottom 47 control unit 13 first side wall 48 — overflow pipe 14 front wall 50 —shield frame - second side wall 52 —shield tray 16 rear wall 56 beam 18 - feed pipe 58 - end roller 19 —hole 60 - chain shaft 64 outlet pipe 21 propeller 21 propeller 22 cover 66 first control valve 24 —flow channel 67 second control valve - flow hole 68 third control valve 26 —air passage 69 fourth control valve 27 —air hole 70 first thermometer 28 - conveyor 71 - second thermometer 29 first circulating water pump 73 third thermometer outlet 80 - fourth thermometer 31 - fourth thermometer first pipe 32 — post-defrost pipe 81 second pipe 32a manifold 82 third pipe 33 third circulating water pump 84 - shut-off valve o 34 initial defrost pipe 86 connecting pipe
    S 35 heat exchanger assembly 100 inlet pipe ro 35a first heat exchanger 102 return pipe
    0 35b second heat exchanger z 36 - nozzle
    + 37 - circulation tube
    O 37a manifold
    S 38 —technical mode
    & 40 double doors 42a first input connection 42b second input connection
    权利要求:
    Claims (13)
    [1]
    A snow melting apparatus comprising a melting tank (10) for melting snow, melting means for melting snow in a melting tank into melting water, said melting means comprising heating a circulating initial melting circuit ), wherein the heat exchanger assembly (35) has a first heat exchanger (35a), characterized in that the heat exchanger assembly further comprises a second heat exchanger (35b) such that the first heat exchanger (35a) is arranged to heat the melt water circulating in the after-melting circuit and the second heat exchanger (35b). ) is arranged to heat the liquid recycled in the initial melting circuit.
    [2]
    Snow melting apparatus according to claim 1, characterized in that - said initial melting circuit comprises an initial melting tube (34) which is at least part of its length inside the melting tank (10).
    [3]
    Snow melting apparatus according to claim 1 or 2, characterized in that said post-melting circuit comprises a circulation pipe (37) and a collecting pipe (37a) for conducting melt water from the melt tank (10) to the first heat exchanger (35a) and a distribution pipe (32a) and at least one distribution pipe (32a) a combined post-melt pipe (32) for conducting heated melt water from the first heat exchanger (35a) to the melt tank (10).
    [4]
    Snow melting apparatus according to one of Claims 1 to 3, characterized in that it comprises a first inlet connection (42a) for connection to the first heat source, a second inlet connection (42b) for connection to the second heat source and a return connection (46) for the first or for connection to another heat source. Q
    [5]
    Snow melting device according to one of Claims 1 to 4, characterized in that the first inlet connection (42a) can be connected to the district heating pipe return pipe (102), the second inlet connection (42b) can be connected to the district heating pipe inlet pipe (100) and the return connection (46) can be connected to the return pipe 3 (102) of the district heating pipeline.
    [6]
    Snow melting apparatus according to claim 4 or 5, characterized in that it comprises a first pipe (80) leading from the first inlet connection (42a) through the first heat exchanger (35a) to the return connection (46) and an inlet connection (80b) from the second inlet connection (42b) to the first pipe (80) 42a) and a second pipe (81) leading to the pipe section between the first heat exchanger (35a).
    [7]
    Snow melting apparatus according to claim 6, characterized in that in the first pipe (80) the pipe section between the first inlet connection (42a) and the connection point of the second pipe (81) has a first control valve (66) and the second pipe (81) has a third control valve (68). ).
    [8]
    Snow melting apparatus according to claim 6 or /, characterized in that it comprises a first tube (80), a pipe section between the connection point of the second tube (81) and the first heat exchanger (35a) via a second heat exchanger (35b) to the first tube (80), a third pipe (82) leading to the pipe section between the first heat exchanger (35a) and the return connection (46).
    [9]
    A method of melting snow with a snow melting apparatus connected to at least one heat source and having a melting tank (10), the method comprising dispensing melted snow into a melting tank (10), melting snow in the melting tank into melting water ) in the after-melting circuit, characterized in that the melt water recyclable in the after-melting circuit is heated by a first heat exchanger (35a) and the liquid recyclable in the initial melting circuit is heated by a second heat exchanger (35b).
    [10]
    A method according to claim 9, characterized in that a first inlet connection (42a) of the melting device is connected to the first heat source, a second inlet connection (42b) to the second heat source, a lower limit temperature is set for the water to be melted, the measured temperature to the lower limit temperature and if the measured temperature falls below the lower limit temperature, water is supplied to the snow melting device from both the first heat source and the second heat source. Method according to Claim 10, characterized in that the + snow melting device is connected with a first inlet connection (42a) to the district heating pipe pipe (102), a second inlet connection (42b) to the district heating pipe inlet pipe (100) N and a return connection (46) to the district heating pipe return pipe.
    [11]
    OF
    [12]
    Method according to Claim 10 or 11, characterized in that a target temperature is set for the water supplied to the first heat exchanger (35a) and / or the second heat exchanger, measured in the first heat exchanger.
    (35a) and / or the temperature of the water supplied to the second heat exchanger and adjusting the amount of water from the first inlet (42a) and the second inlet (42b) to maintain the temperature measured by the control valves (66, 68) substantially at the target temperature.
    [13]
    Method according to Claim 11 or 12, characterized in that if the temperature of the water flowing from the district heating pipeline return pipe (102) to the snowmelt system exceeds the lower limit temperature, only water from the district heating pipeline return pipe (102) is supplied to the snowmelt system.
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    FI129005B|2021-04-30|
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