• 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:
    Method for controlling a stream of waste water in a purification device 10 comprising a pump 1 connected to a reservoir 2 and pumping waste water from the reservoir 2 to the purification plant 4 via a discharge line 3 between the pump 1 and a purification plant 4 the reservoir 2 is provided with a level sensor 5 with which a waste water level is measured in the pump reservoir 2, wherein a pressure sensor 6 is placed in the discharge line 3 with which the pressure in the waste water is measured, wherein the pressure via a control unit 7th pump 1 on an energy -efficient point of the pump curve works as long as the level in the reservoir 2 is above a minimum value.
    公开号:BE1025338B1
    申请号:E2017/6003
    申请日:2017-12-27
    公开日:2019-01-31
    发明作者:Rijsbergen Adrianus Jacobus Van
    申请人:Fvc Holding B.V.；
    IPC主号:
    专利说明:

    Brief indication: Method for controlling a stream of waste water and a device for carrying out the method.
    Description
    The invention relates to a method for controlling a stream of waste water in a purification device comprising a pump connected to a reservoir and pumping waste water from the reservoir to the purification plant via a discharge line between the pump and a purification plant, wherein in the reservoir a level sensor is fitted with which a waste water level in the reservoir is measured.
    Such a method is described in US 8,983,667 B2. According to this known method, the pump is switched on when the level sensor indicates a maximum value of the waste water level in the reservoir and is switched off again when the level sensor indicates a minimum value of the waste water level. This known method has the drawback that the energy consumption of the pump is high and that the capacity of the reservoir is not optimally utilized.
    According to the invention, these disadvantages are eliminated and this method is characterized in that a pressure sensor is placed in the discharge line with which the pressure in the waste water is measured, wherein the pressure via a control unit causes the pump to operate at an energy-efficient point of the pump curve as long as the level in the reservoir is above a minimum value.
    The method according to the invention has the advantage that the pump is used in the most energy-efficient manner for pumping away the waste water. The pump is constantly on as long as the waste water is above a certain minimum level in the reservoir. Compared to conventional installations where the pump is switched on or off when a maximum or minimum waste water level is detected in the reservoir, an energy saving of approximately 30% is possible. An additional advantage is that the capacity of the reservoir is optimally utilized. According to the known method mentioned above, the pump is switched off as soon as a minimum waste water level in the reservoir has been reached and the pump is no longer switched on before a maximum level in the reservoir has been reached again. This means that on average more waste water is present in the reservoir. After all, as soon as the pump is switched off, the level of the waste water rises as there is no more
    2017/6003
    B E2017 / 6003 pumped. In the method according to the invention, pumping is always carried out as soon as the minimum level of the waste water is exceeded.
    A further advantage is that according to this method the level sensor must only indicate a minimum waste water level, making the device simpler, ie less complex or fewer components are required, e.g. only one level sensor instead of two, namely one for the minimum and a second for the maximum level.
    Although the method can advantageously be used with many types of waste water such as, for example, in a chemical plant, the method is preferably used with sewage as waste water. Conventional sewage treatment plants cause more and more problems because they consume too much energy and are often no longer sufficient in terms of capacity. Usually sewage treatment plants are combinations of sewage and rainwater treatment plants. The increased amount of precipitation due to climate change, and in particular the unpredictability of extreme weather, often causes conventional sewage systems problems with heavy showers that cause flooded houses and streets. Because according to the invention the capacity of the reservoir is utilized more optimally or, on average, a much larger capacity is available in the reservoir, a sudden thunderstorm or an extreme supply of waste water will cause fewer problems. Moreover, large costs are avoided that have to be made to enlarge existing reservoirs.
    Preferably a control unit is used which, with the help of a variable speed inverter (VSI) and a programmable logic controller (PLC), makes the pump work at the most energy-efficient point of the pump curve. The PLC is then programmed such that, depending on the signal from the pressure sensor, the pump is used in the most efficient manner. A so-called pump curve is available for each pump via a manufacturer or supplier. This is a graph in which the pressure supplied by the pump or the delivery head is plotted against the delivered waste water flow. This graph also indicates at which pressure the pump works most efficiently. The PLC and the VSI arrange that the pump works in its most energy-efficient position.
    The invention also relates to a device for purifying waste water which comprises a pump which is connected to a reservoir and is connected via a discharge line to a purification plant, wherein in the reservoir a
    2017/6003
    B E2017 / 6003 level sensor is provided for measuring a waste water level in the reservoir. Such a device is also known from US 8,983,667B2. According to the known device, the pump is switched on when the level sensor indicates a maximum value of the waste water level in the reservoir and is switched off again when the level sensor indicates a minimum value of the waste water level. The known device has the drawback that the energy consumption of the pump is high and that the capacity of the reservoir is not optimally utilized. According to the invention, the device is characterized in that a pressure sensor is placed in the discharge line for measuring the pressure in the waste water, the pressure sensor being connected to a control unit that is programmed such that as long as a signal from the level sensor indicates that the waste water level is above is a minimum value, the control unit can operate the pump at an energy-efficient point of the pump curve using the pressure sensor.
    US 5,941,690 discloses a pump in which a pressure sensor is included in a high-pressure line of the pump to keep the pressure in the high-pressure line constant. However, this pump is used in a clean water system to maintain a constant high pressure on a water pipe in high buildings so that water taps and showers also function well on upper floors. A waste water system is not designed for a constant pressure. Moreover, there is no indication whatsoever that the pump in the clean water system is being used in an energy-efficient manner.
    The invention further relates to an above-mentioned device wherein the waste water is sewage water. The device is then more energy efficient than existing sewage treatment plants, while, as mentioned above, the capacity of the reservoir is greater and flooding can be avoided more often. Moreover, large costs are avoided that have to be made to enlarge existing reservoirs.
    The invention also relates to a device, wherein the control unit comprises a "variable speed inverter" (VSI) and a "Programmable Logic Controller" (PLC). Such a control unit has far fewer components compared to a conventional pump control unit. The combination of VSI and PLC also makes it possible to use software in the PLC to tune the control unit to the pump and the drain pipe. As an added benefit, this control unit can be used for additional functions
    2017/6003
    B E2017 / 6003 are added to the device, such as detecting a defect in the pump and cleaning the pump or drain line.
    The invention also relates to a device in which the discharge line is provided with a non-return valve and the pressure sensor is placed between the non-return valve and the purification installation. The non-return valve prevents waste water from flowing back into the pump. The pressure sensor therefore indicates the pressure in the discharge line to the treatment plant when the non-return valve is closed.
    The invention also relates to a pump unit provided with a pressure sensor and control unit for use in a device according to the above description. Such a pump unit can be used in existing waste water treatment installations with the above-mentioned advantages.
    The invention also relates to a sewage treatment plant comprising a sewage treatment plant connected via drain pipes to a number of reservoirs containing the sewage water from a number of houses or factories, the reservoirs being connected to pumps connected via the drain pipes with the sewage treatment plant, wherein a level sensor is arranged in the reservoirs for measuring a waste water level in the relevant reservoir, characterized in that a pressure sensor is placed in discharge pipes for measuring the pressure in the waste water, the pressure sensor being connected to a control unit which is programmed such that as long as a signal from the level sensor indicates that the waste water level in a particular reservoir is above a minimum value, the pressure sensor can cause the pump associated with that reservoir to operate at an energy efficient point of the pump curve.
    The invention is further elucidated with reference to the following description, wherein reference is made to the figure description in which:
    Figure 1 shows a method and a device for controlling a waste water stream.
    Figure 2 relates to a pump curve,
    Figure 3 shows a pump curve and a characteristic of a drain line and
    Figure 4 concerns a sewage treatment system.
    Figure 1 illustrates a method for controlling a stream of waste water in a purification device 10 which comprises a pump 1 connected to a reservoir 2 and via a discharge line 3 between the pump 1 and a purification installation
    4, pumps wastewater from the reservoir 2 to the purification plant 4, whereby in the
    2017/6003
    A level sensor 5 is provided with reservoir 2 with which a waste water level in the reservoir 2 is measured. The pump 1 is connected to the reservoir 2 in figure 1 by placing the pump 1 on the bottom of reservoir 2. The pump is then immersed in the waste water during use. The pump 1 can also be placed outside the reservoir 2 and be connected to the reservoir 2 via a supply line.
    Figure 1 also shows a purification device 10 that can pump waste water from a reservoir 2 to a purification plant 4.
    Such a method is described in US 8,983,667B2. In the known method, a pump is switched on when a level sensor indicates a maximum value of the waste water level in a reservoir and is switched off again when a level sensor indicates a minimum value of the waste water level. The known method has the drawback that the energy consumption of the pump is high and that the capacity of the reservoir is not optimally utilized.
    According to the invention, these disadvantages are eliminated in that a pressure sensor 6 is placed in the discharge line 3 with which the pressure in the waste water is measured and wherein the pressure via a control unit 7 causes the pump to operate at an energy-efficient point of the pump curve as long as the waste water level in the reservoir 2 is above a minimum value.
    The method according to the invention has the advantage that the pump 1 is used in the most energy-efficient manner for pumping away the waste water. The pump 1 is constantly on as long as the waste water is above a certain minimum level in the reservoir 2. Compared to conventional installations where the pump is switched on or off when a maximum or minimum waste water level is detected in the reservoir, an energy saving of approximately 30% is possible. An additional advantage is that the capacity of the reservoir 2 is optimally utilized. According to the known method mentioned above, the pump is switched off as soon as a minimum waste water level in the reservoir has been reached and the pump is no longer switched on before a maximum level in the reservoir has been reached again. This means that on average more waste water is present in the reservoir. After all, as soon as the pump is switched off, the level of the waste water rises since no more pumping is carried out. In the method according to the invention, pumping is carried out continuously as soon as the minimum level of the waste water is exceeded. A further advantage is that according to this method the level sensor 5 must only indicate a minimum waste water level, whereby the device becomes simpler, i.e.
    2017/6003
    B E2017 / 6003 less complex, for example a small level sensor 5 instead of a large one that can measure the minimum and maximum level, or fewer components are needed, for example only one simple level sensor 5 instead of two level sensors, namely one for the minimum and a second for the maximum level.
    Figure 2 shows an example of pump curves as supplied by the manufacturer or supplier of a pump 1. Figure 2A shows the pressure in the discharge line 3 of the pump 1 for two different pumps 1A and 1B (expressed in [m] head) as a function of the flow in [1 / s] of waste water through the pump 1. Figure 2B shows the efficiency as a function of the flow and Figure 2C the power on the axis of the pumps 1A and 1B as a function of the flow. The pumps 1A or 1B are used by the control unit 7 at or around the maximum MAX1A and MAX1B of the efficiency curve 2B. Figure 2A indicates that for pump 1A the maximum MAX1A is at a pressure of 9 m head and for pump 1B MAX1B is at a pressure of 7.5 m head.
    Figure 3 shows two curves. Curve P1 shows how the pressure [m] supplied by the pump depends on the flow in [l / s] as in graph 2A. Curve A3 shows how the pressure in the discharge line 3 depends on the flow. The discharge line and the pump can be adapted to each other in such a way that the pump can work as much as possible in the working point W. In many waste water systems, however, the drain pipe is dimensioned to a maximum capacity for emergencies.
    The control unit 7 preferably comprises a 'variable speed inverter' (VSI) and special software in a 'Programmable Logic Controller' (PLC) to control the number of revolutions and thus the flow through the pump 1 such that the pump 1 constantly pumps up a most efficient point of the MAX1A or MAX1B pump curve for that particular pump. The combination of VSI and PLC also makes it possible to use software in the PLC to tune the control unit 7 to the pump 1 and the drain line 3. The pressure sensor 6 is installed as much as possible flushed into the drain line 3 to prevent the flow of waste water to prevent and damage the sensor 6. In Figure 1, the pressure sensor 6 is installed in the discharge line 3 immediately after a non-return valve 8. The non-return valve prevents backflow of waste water into the pump when the pump is not running or is defective. The pressure sensor 6 is preferably installed close to the pump and may even be built into the pump 1 itself. The high pressure side of the pump 1 is part of the discharge line 3. In a practical example, a pressure sensor 6 supplies an analogue
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    B E2017 / 6003 signal of approximately 4-20mA. This signal is a reference signal for the pressure in the discharge line 3. The reference signal for the pressure is supplied to a control unit 7 comprising a VSI provided with a PLC or it is supplied to a control unit 7 which comprises a PLC which includes a VSI via a Modbus for example Control TCP bus connection. Such a control unit 7 comprises much fewer components than a conventional pump control unit. In practice, for example, the number of components for the control unit can be reduced from approximately 35 to approximately 5 components.
    The invention is further elucidated on the basis of an example. The level sensor 5 emits an analog signal of approximately 4-20mA that is a reference signal for the minimum waste water level in the reservoir 2. A pump 1 according to pump curve 1A from figure 2 stands on the bottom of the reservoir 2. The essence of the level sensor 5 is that the pump 1 is not started when no waste water is present in the reservoir 2 and the pump 1 can be damaged by dry running. The signal from the level sensor 5 is also supplied to the control unit 7. The control unit 7 then switches off the pump 1 when the waste water in the reservoir 2 has reached a minimum level. The pressure sensor 6 provides a reference signal of approximately 4-20mA that is a measure of the pressure in the discharge line 3. The control unit 7 now ensures that the pump 1 in the discharge line has a pressure of 9m head (see figure 1A), which corresponds to a maximum MAX1A on the efficiency curve of figure 2B. Such a device consumes approximately 30% less energy than conventional known devices. Moreover, the average available capacity of the reservoir 2 appears to have increased by at least 30%. In dry weather the increase is even 65%.
    The level sensor 5 can work with different detection methods such as hydrostatic, ultrasonic or with the help of radar. The level sensor 5 can also be arranged in the pump 1 or the crankcase of the pump 1. Part of the housing of the pump 1 then forms part of the discharge line 3.
    As an additional advantage, additional functions can be added to the device 10 with the aid of the control unit 7. This occurs in particular by detecting deviations in the relationship pressure versus power supplied to the pump. To know:
    • detection of a defect or wear on the pump 1: pressure does not rise with more power to the pump, • cleaning of the pump or discharge line: high pressure and high power to pump 1 for high flow,
    2017/6003
    B E2017 / 6003 • detection of blockages: pressure in discharge line 3 reacts abnormally to extra power supply to the pump 1, • temperature control of the pump 1: switching off the pump for long-term high power use, for example when blockages in the discharge line 3, • upgrading of the pump using new software for example to EU specifications IE3 or even to EI4, • to give pump 1 an increased pressure on start-up: hydraulic 'boost',
    Figure 4 shows a sewage treatment plant which comprises a sewage treatment plant 4 which is connected via drain pipes 3 to a number of reservoirs 2 containing the sewage water of a number of houses H or factories F, the reservoirs 2 being connected to pumps 1, are connected via the discharge pipes 3 to a joint sewage treatment plant 4, wherein a level sensor 5 is fitted in the reservoirs 2 for measuring a waste water level in the relevant reservoir 2, wherein a pressure sensor 6 is placed in the discharge pipes 3 for measuring the pressure in the waste water wherein the pressure sensor 6 is connected to a control unit 7 which is programmed such that as long as a signal from the level sensor 5 indicates that the waste water level in a respective reservoir 2 is above a minimum value, the control unit using the pressure sensor 6 the relevant pump 1 can operate at an energy efficient point of the pump curve. The device according to figure 4 comprises a number of pumping devices 10 according to the invention, with reference to figure 1. Waste water from a plurality of reservoirs 2 is pumped to a joint purification plant 4. Figure 4A shows an outer area where the houses H or factories F are connected via their own pumping devices 10 with reservoirs 2 and discharge pipes 3 to a final pumping station for an area EG. A part of the discharge line 3 does not have to be a high-pressure line if there is a natural decay V in the discharge line 3. The pumping station EG again comprises a pumping device 10 with two pumps 1 with a joint discharge line 3 to a transport pumping station TG which again also comprises a pumping device 10 with a number of pumps 1 according to the invention with a joint discharge line 3 to the sewage treatment plant 4. In figure 4B shows the situation in a village or town where houses H or factories F drain waste water through a pipeline with free fall V to a WG district pumping station. The district pumping station WG again comprises a pumping device 10 with a reservoir 2 provided with pumps 1. The district pumping station WG is again connected to the
    2017/6003
    B E2017 / 6003 transport pump WG. When several pumps are used, such as in the ground EG, WG and TG, several pumps 1 are controlled by a common control unit 7. The device according to figure 4 can also comprise a control which comprises all pumping devices, for example, in an emergency situation for all pumps to operate at maximum power.
    In a sewage treatment plant according to figure 4 the invention can be applied to increase the capacity of the sewer system without making structural adjustments to reservoirs 2. The invention ensures that on average much less waste water is present in the reservoirs 2 than with conventional pumping devices 10 with an on-off control. The system can also be optimized for, for example, a constant flow in the main sewer system between district pumping station WG, a final pumping station area EG and the transport pumping station TG.
    权利要求:
    Claims (10)
    [1]
    CONCLUSIONS
    Method for controlling a flow of waste water in a purification device comprising a pump connected to a reservoir and pumping waste water from the reservoir to the purification plant via a discharge line between the pump and a purification plant, wherein a level sensor is arranged in the reservoir with which a waste water level in the reservoir is measured, characterized in that a pressure sensor is placed in the discharge line with which the pressure in the waste water is measured, whereby the pressure via a control unit causes the pump to operate at an energy-efficient point of the pump curve as long as the level in the reservoir is above a minimum value.
    [2]
    The method of claim 1 wherein the waste water is sewage.
    [3]
    Method according to one of the preceding claims, wherein the control unit makes the pump work at the most energy-efficient point of the pump curve via a "variable speed inverter" (VSI) and a "Programmable Logic Controller" (PLC).
    [4]
    4. Device for purifying waste water comprising a pump connected to a reservoir and connected via a discharge line to a purification installation, wherein a level sensor is arranged in the reservoir for measuring a waste water level in the reservoir, characterized in that: that a pressure sensor is placed in the discharge line for measuring the pressure in the waste water, the pressure sensor being connected to a control unit that is programmed such that as long as a signal from the level sensor indicates that the waste water level is above a minimum value, the control unit can operate the pump at an energy-efficient point of the pump curve using the pressure sensor.
    [5]
    5. Device as claimed in claim 4, wherein the waste water is sewage water.
    [6]
    Device according to claims 4-5, wherein the control unit comprises a "variable speed inverter" and a "Programmable Logic Controller" (PLC).
    [7]
    Device as claimed in claims 4-6, wherein the discharge line is provided with a non-return valve and the pressure sensor is placed between the non-return valve and the purification installation.
    [8]
    Pump unit provided with a pressure sensor and control unit for use in a device according to claims 4-7.
    [9]
    9. A sewage treatment plant comprising a sewage treatment plant connected via drain pipes to a number of reservoirs containing the sewage water
    2017/6003
    B E2017 / 6003 of a number of houses or factories in which the reservoirs are connected to pumps connected to the sewage treatment plant via the discharge pipes, wherein a level sensor is fitted in the reservoirs for measuring a waste water level in the relevant reservoir, characterized in that in
    5, a pressure sensor is placed for measuring the pressure in the waste water, the pressure sensor being connected to a control unit that is programmed such that as long as a signal from the level sensor indicates that the waste water level in a particular reservoir is above a minimum value, the pressure sensor the pump belonging to that reservoir at an energy efficient point of the
    [10]
    10 pump curve can work.
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    同族专利:
    公开号 | 公开日
    BE1025338A1|2019-01-24|
    NL2018093B1|2018-07-06|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US20150168957A1|2013-12-16|2015-06-18|Schneider Toshiba Inverter Europe Sas|Control process to save electrical energy consumption of a pump equipment|
    法律状态:
    2019-02-25| FG| Patent granted|Effective date: 20190131 |
    2020-08-27| MM| Lapsed because of non-payment of the annual fee|Effective date: 20191231 |
    优先权:
    申请号 | 申请日 | 专利标题
    NL2018093A|NL2018093B1|2016-12-29|2016-12-29|Method for controlling a stream of waste water and device for carrying out the method.|
    NL2018093|2016-12-29|
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