• 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 present invention relates to a heat recovery device, comprising at least one lower closed circuit for collecting heat by thermal radiation, tubular thermosyphons having an open end portion connected to the lower circuit and a closed upper end portion, and a fluid pipe in free circulation which extends transversely to the thermosyphons and which receives the upper end portions of the thermosyphons, the lower circuit and the thermosyphons forming a vacuum circuit containing a working heat transfer fluid capable of evaporating under the effect of radiation and of rising in the thermosyphons to condense in the upper end portion after heat transfer by convection to the fluid present in the upper pipe. The invention also relates to a storage installation comprising at least one such device.
    公开号:BE1021752B1
    申请号:E2013/0763
    申请日:2013-11-07
    公开日:2016-01-15
    发明作者:Ludovic Ferrand；Maria Zoghaib；Matthieu Durand
    申请人:Cockerill Maintenance & Ingenierie S.A.；
    IPC主号:
    专利说明:

    Heat recovery device and hot product storage facility
    The present invention relates to the recovery of heat in an industrial environment and, in particular, the recovery of heat released by hot products, for example during storage. The recovered heat is for example used to heat a fluid and reduce the energy consumption of an installation.
    Many industrial installations, and especially heat treatment installations, require, in order to operate, to consume a relatively large amount of energy. This energy results mainly from the combustion of fossil materials such as coal, hydrocarbons or gas, or can be of nuclear origin when it is consumed in the form of electricity. For an industrialist, energy represents, in terms of purchase, a significant cost that continues to increase and both its production and its consumption generate pollution that must be treated, further increasing the expenses related to energy. The result is a growing desire to reduce the energy consumption of industrial installations.
    Among the research axes most commonly explored for this purpose, we find the optimization of energy consumption and the reduction of energy losses, the use of renewable energies ...
    Taking as an example a thermal treatment process implemented by means of a furnace operating by natural gas combustion, it has been envisaged to: reduce the consumption of natural gas by improving the efficiency of the burners, the heat transfer to the products to be heated and the thermal insulation of the oven, - to recover the heat in the vicinity of the burners, this is called regenerative burners, or in the fumes emanating from the oven, - to use the recovered heat for example to preheat the air in the oven .
    This type of measurement provides substantial savings but generates other costs related in particular to the purchase and maintenance of heat recovery devices. Indeed, these heat recovery devices are generally formed of a heat transfer fluid heat exchanger circulating in a circuit connected to a circulation pump controlled by a control unit.
    An object of the invention is to provide a solution for improving the heat recovery in industrial facilities especially when heated products are left in the open air to cool. For this purpose, there is provided, according to the invention, a heat recovery device, comprising at least one closed bottom heat collection circuit by thermal radiation, tubular thermosiphons having an open end portion connected to the lower circuit and a portion closed end end, and a free-flowing fluid line which extends transversely to the thermosyphons and which receives the upper end portions · of the thermosyphons, the lower circuit and the thermosyphons forming a vacuum circuit containing a heat transfer fluid of work likely to evaporate under the effect of radiation and rise in the thermosyphons to condense in the upper end portion after heat transfer by convection to the fluid in the upper pipe.
    This device has many advantages. In particular, its operation does not require a pump to ensure the flow of fluids: no movable member or external energy source is mandatory and no regulation is necessary. This results in high reliability and low maintenance. This device also requires a small investment in both purchase and maintenance. In addition, since the device exploits the latent heat associated with the change of state of the working heat transfer fluid, the heat transfers for a given temperature difference are relatively large. The invention also relates to a hot product storage facility comprising an enclosure defining a hot product receiving zone and at least one heat recovery device of the above type mounted above the receiving zone.
    The thermal radiation emanating from the hot products will come to heat the coolant working fluid in the lower circuit. The working fluid will evaporate before recondensing in the upper end portion of the thermosyphons by yielding its heat by convection to the fluid present in the upper conduit. It is understood that the heat recovery is more effective than the lower circuit is close to the heated products. Other features and advantages of the invention will emerge on reading the following description of particular non-limiting embodiments of the invention.
    Reference is made to the accompanying drawings, in which: FIG. 1 is a schematic perspective view of a recovery device according to the invention, FIG. 2 is an enlarged view of zone II of FIG. Figure 3 is a schematic view of a storage facility according to the invention, mounted downstream of a heat treatment plant.
    With reference to the figures, the heat recovery device according to the invention is here used in a hot product storage installation 100. The storage facility 100 includes an enclosure 101 which delimits a receiving zone 102 of hot products. Heat recovery devices generally designated 1 are mounted in the enclosure 101 above the reception zone 102. The storage installation 100 is disposed downstream of a heat treatment plant 200 of metal products such as slabs, beams, sheets ... The heat treatment plant 200 is known per se and comprises for example a furnace provided with burners fed with air via a feed circuit 201.
    Each recovery device 1 comprises at least one lower circuit 2, closed, heat capture by thermal radiation, tubular thermosiphons 3 having a lower end portion 3.1 open connected to the lower circuit 2 and an upper end portion 3.2 close , and an upper pipe 4 which extends transversely to the thermosyphons 3 and which receives the upper end portions 3.2 of the thermosyphons.
    The upper pipe 4 has a rectangular cross-section and has a flat horizontal bottom wall through which the thermosyphons 3. The upper pipe 4 has its ends provided respectively with means for connecting it to an external air intake and cooling means. its connection to the supply circuit 201 for transporting the air drawn outside and heated in the upper pipe 4 to the burners of the heat treatment furnace. It is thus achieved a preheating of the air which will be mixed with the gas to form the mixture which will be burned in the heat treatment furnace. It will be noted that the upper end portions 3.2 of the thermosyphons 3 extend over the entire height of the upper pipe 4 in such a way that the air present in the pipe 4 is necessarily brought into contact with the said upper end portions 3.2.
    The device here comprises several lower circuits 2 each in the form of a horizontal pipe along which the thermosyphons 3 are stitched. The thermosyphons 3 are attached to the pipes of the lower circuit 2 so as to ensure a seal between the thermosyphons 3 and each pipe. in which they are stitched. The thermosyphons 3 extend vertically and the pipes of the lower circuits 3 extend parallel to the upper pipe 4.
    The upper end portions 3.2 of the thermosyphons 3 are provided externally with fins 3.3. These fins 3.3 make it possible to increase the possibilities of convective heat exchange between the upper end portions 3. 2 of the thermosyphons 3 and the air flowing in the upper duct 4. In order to facilitate the assembly of the thermosyphons on the upper duct 4, the upper end portions 3.2 may be attached to the lower end portions 3.1. The fins may also be attached to the upper end portions 3.2 after they have been put in place through the flat bottom wall of the upper pipe 4 and before said flat bottom wall is covered with the other walls constituting the upper pipe 4.
    Each lower circuit 2 and associated thermosyphons 3 forming a vacuum circuit containing a working heat-transfer fluid capable of evaporating under the effect of the radiation and mounting in the thermosyphons 3 to condense in the upper end portion 3.2 after heat transfer by convection to the air present in the upper duct 4. In a range of use of the coolant from 20 ° C to 350 ° C, the water provides the best heat transfer properties in boiling and condensation and this for a low cost of implementation. The use of other heat transfer fluids such as thermal oils is also possible but limited by their temperature of thermal degradation, directly related to the amount of heat received by radiation. The choice of the appropriate heat transfer fluid will depend on its temperature of use and thus on the intensity of the thermal radiation between the system and the hot products. The use of water reduces the overall cost of manufacturing the system and is here recommended. The reference case used for sizing the system uses water at 25bar and a temperature of 226 ° C. The portion of the thermosyphons 3 extending between the upper pipe 4 and the lower circuit 2 is insulated so that the working heat transfer fluid can undergo an adiabatic transformation. The lower circuits 2 comprise unrepresented taps allowing the filling of the lower circuits 2 with the heat transfer fluid and the evacuation of the lower circuits 2.
    The working pressure in the lower circuits 2 and the thermosyphons 3 may be 20 or 25 bars or more depending on the heat radiation to which the lower circuits 2 are subjected. The means ensuring the sealing of the circuits must be able to withstand such pressure.
    The lower circuits 2, the thermosyphons 3 and the upper pipe 4 are preferably rectilinear to reduce the manufacturing cost of the device.
    Safety valves are provided to prevent overpressure in the lower circuits 2, in the thermosyphons 3.
    The upper duct 4 is advantageously provided with a discharge duct in such a way that, in the event of the furnace stopping, an air flow is maintained in the upper duct 4.
    Of course, the invention is not limited to the embodiments described but encompasses any variant within the scope of the invention as defined by the claims.
    In particular, the heat recovery device may have a different geometry from that shown in the figures. The device can for example be made by means of curved tubes.
    The thermosyphons may be devoid of fins.
    Although the invention has been more particularly described in application to the steel field, the invention is used in any industrial environment.
    权利要求:
    Claims (6)
    [1]
    A heat recovery device, comprising at least one closed bottom thermal radiation heat sensing circuit, tubular thermosyphons having an open end portion connected to the bottom circuit and a closed upper end portion, and a fluid conduit. in free circulation which extends transversely to the thermosiphons and which receives the upper end portions of the thermosiphons, the lower circuit and the thermosiphons forming a vacuum circuit containing a heat transfer fluid capable of evaporating under the effect of radiation and mounting in the thermosyphons to condense in the upper end portion after convective heat transfer to the fluid in the upper conduit.
    [2]
    2. Device according to claim 1, wherein the upper end portions of the thermosyphons are provided externally with fins.
    [3]
    3. Device according to claim 1, comprising several lower circuits each in the form of a horizontal pipe along which the thermosiphons are stitched. 4. Device according to claim 3, wherein the pipes of the lower circuits extend parallel to the upper pipe.
    [5]
    5. Device according to claim 1, wherein the upper pipe has a rectangular cross section.
    [6]
    6. Device according to claim 1, wherein the lower circuit, the thermosyphons and the upper line are straight.
    [7]
    7. Hot product storage installation comprising an enclosure defining a hot product receiving zone and in which is mounted at least one device, according to any one of the preceding claims, extending above the receiving zone.
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    同族专利:
    公开号 | 公开日
    BR202013029639U2|2015-07-21|
    FR2998359A1|2014-05-23|
    CN203550708U|2014-04-16|
    FR2998359B1|2014-12-12|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US5806583A|1995-04-14|1998-09-15|Nippondenso Co. Ltd.|Easily manufactured cooling apparatus using boiling and condensing refrigerant and method of manufacturing the same|
    EP0952612A1|1998-04-23|1999-10-27|Ferraz Date Industries|Heat exchanger, in particular for cooling an electronic power component, and its method for fabrication|
    EP1387139A2|2002-08-02|2004-02-04|Mitsubishi Aluminum Co.,Ltd.|Heat pipe unit and heat pipe type heat exchanger|
    US20040105235A1|2002-12-02|2004-06-03|Tai-Sol Electronics Co., Ltd.|Heat sink|
    JP2006313056A|2005-04-05|2006-11-16|Denso Corp|Heat pipe, and exhaust heat recovery system using the same|
    法律状态:
    2020-08-21| MM| Lapsed because of non-payment of the annual fee|Effective date: 20191130 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1203095|2012-11-19|
    FR1203095A|FR2998359B1|2012-11-19|2012-11-19|HEAT RECOVERY DEVICE AND STORAGE FACILITY FOR HOT PRODUCTS|
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