CN211854955U - Liquid level adjusting device for condenser hot well for steam turbine - Google Patents
Liquid level adjusting device for condenser hot well for steam turbine Download PDFInfo
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- CN211854955U CN211854955U CN201922371261.5U CN201922371261U CN211854955U CN 211854955 U CN211854955 U CN 211854955U CN 201922371261 U CN201922371261 U CN 201922371261U CN 211854955 U CN211854955 U CN 211854955U
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Abstract
The utility model discloses a hot well liquid level regulating device of condenser for steam turbine, including the hot well, level sensor, a controller, the water tank, the condensate trunk line, drainage pipe and return water pipeline, the entry and the hot well intercommunication of condensate trunk line, the first export and the outside drainage system intercommunication of condensate trunk line, be equipped with normally open water pump on the condensate trunk line, drainage pipe intercommunication water tank and the second export that the condensate was responsible for, and dispose the normal close and open the drain valve soon on the drainage pipe, return water pipeline intercommunication hot well and water tank, be equipped with the normal close return water valve that opens soon on the return water pipeline, a water pump, level sensor, the normal close opens the drain valve soon, the normal close opens the return water valve soon all and is connected with the controller electricity. This hot well liquid level adjusting device of condenser for steam turbine is more for practicing thrift the electric energy, can reduce fortune dimension cost, and liquid level control precision is higher to more do benefit to miniaturized design.
Description
Technical Field
The utility model relates to a condenser technical field especially relates to a hot well liquid level regulating device of condenser for steam turbine.
Background
The steam turbine is a rotary power device which utilizes the internal energy of steam to do work through turbine stage expansion to drive a generator, a pump, a fan, a compressor and the like, and is widely applied to the fields of power plants, steel, petrochemical industry and the like. The condenser is one of the important auxiliary machines of the steam turbine set, and the exhaust steam of the condensing steam turbine is condensed into water after passing through the condenser, and the water is stored in a hot well of the condenser, and then the condensed water is sent to subsequent process equipment such as a low-pressure heater or a deaerator by a condensed water pump.
The condenser mainly comprises a shell, a tube plate, a tube bundle, a middle tube plate and the like. The condenser shell is divided into a steam condensation area and a circulating cooling water inlet and outlet water chamber by the tube plate; the intermediate tube sheet is used for supporting and positioning the tube bundle. The lower part of the condenser is also provided with a hot well which is used for collecting main condensed water generated by continuous condensation of a large amount of dead steam and providing a certain static pressure head for the condensed water pump. When the liquid level of the hot well is too low or too high, the safe and economic operation of the steam turbine is influenced, when the heat exchange tube of the condenser is submerged by the too high liquid level of the hot well, the heat exchange area of the heat exchanger is reduced, the heat exchange effect is weakened, the efficiency of the steam turbine is reduced, the supercooling degree of condensed water is increased, oxygen dissolved in the condensed water is increased, a pipeline valve between the condenser and a deaerator and a heater are corroded, and the supercooling of the condensed water increases the heat taken away by cooling water, so that the economical efficiency of the steam turbine is reduced; when the liquid level of the hot well is too low, the condensate pump is cavitated, the liquid level of the deaerator is further low, and the feed pump is vaporized when the liquid level is serious, so that the normal water supply of the boiler is further influenced. Therefore, the condenser hot well liquid level regulating device needs to be designed.
At present, the liquid level of a condenser hot well is regulated by controlling the flow of a condensation water main pipe and a recirculation pipe. Specifically, as shown in fig. 1, an electric or pneumatic control valve is provided in each of the condensate main pipe 2 and the recirculation pipe 5, the condensate pump 3 is disposed in the condensate main pipe 2, the inlet of the recirculation pipe 5 is located between the condensate pump 3 and the condensate main pipe control valve 4, and when the condenser 1 is under an initial load or cold condition, the condensate main pipe control valve 4 is closed, and the liquid level of the hot well 11 is maintained within a given range by controlling the opening degree of the recirculation pipe control valve 5. When the liquid level of the hot well 11 is higher than a given value, opening the main condensed water regulating valve 4, and gradually closing the recirculation pipe regulating valve 6 to reduce the liquid level of the hot well and maintain the liquid level in a given range; and conversely, when the liquid level of the hot well is lower than the given value, the regulating valve 6 of the recirculation pipe is opened, and the regulating valve 4 of the main condensed water pipe is gradually closed, so that the liquid level of the hot well is gradually increased.
However, when the steam turbine is in a starting condition or the steam turbine is not in a full-load operation state, the liquid level of the hot well is always in a gradually reduced state, in order to maintain the liquid level of the hot well in a given range, the adjusting valve of the condensate main pipe must be opened all the time, and a part of the condensate water flows back to the hot well of the condenser through the recirculation pipe, namely, a part of the work done by the condensate pump is specially used for maintaining the liquid level of the hot well, which means that the current method for controlling the liquid level of the hot well is very energy-saving, and the operation and maintenance cost is overhigh.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to provide a more energy-conserving hot well liquid level regulating device of condenser for steam turbine to reduce the fortune dimension cost, the liquid level control precision is higher, and more do benefit to miniaturized design.
The purpose of the utility model is realized by adopting the following technical scheme:
condenser hot well liquid level adjusting device for steam turbine, including the hot well, be used for monitoring level sensor, controller, water tank, condensate main pipe, drainage pipe and the return water pipeline of the liquid level change of hot well, the entry and the hot well intercommunication of condensate main pipe, the first export and the external drainage system intercommunication of condensate main pipe, be equipped with normally open water pump on the condensate main pipe, drainage pipe intercommunication the water tank with the second export that the condensate is responsible for to dispose the normal close quick-open drain valve on the drainage pipe, return water pipeline intercommunication the hot well with the water tank, be equipped with the normal close quick-open return water valve on the return water pipeline, water pump, level sensor, normal close quick-open drain valve, normal close quick-open return water valve all with the controller electricity is connected, when the liquid level in the hot well is higher than when setting for the liquid level, and when the liquid level in the hot well is lower than a set liquid level, the water return valve is opened, so that the water in the water tank flows into the hot well.
Furthermore, return water pipe configuration has two, the quantity of normal close quick-opening return water valve with return water pipe's quantity equals.
Further, a first filter is arranged on the drain pipe and located between a second outlet of the condensed water main pipe and the normally closed quick-opening drain valve.
Further, a second filter is arranged on the water return pipeline and located between the normally-closed quick-opening water return valve and the water tank.
Furthermore, the water tank is provided with a water replenishing port and a water discharging port, the water replenishing port is communicated with an external water source system and used for replenishing water liquid to the water tank, and the water discharging port is communicated with an external water discharging system and used for discharging excessive water liquid in the water tank.
Further, the liquid level sensor is a liquid level transmitter, and the liquid level transmitter is used for detecting the liquid level change of the hot well and sending the detected liquid level ascending or descending signal to the controller.
Further, the liquid level sensor includes high level sensor and low level sensor, high level sensor is used for detecting the high liquid level of hot-well, low level sensor is used for detecting the low liquid level of hot-well.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the normally closed quick-opening drain valve or the normally closed quick-opening water return valve can be started only in the abnormal state of the hot well liquid level, and the normally closed quick-opening drain valve does not need to be opened all the time, so that the structure of the condenser hot well liquid level adjusting device for the steam turbine with the structure can save electric energy, and the operation and maintenance cost can be reduced;
in addition, because the precision of normally closed quick-opening drain valve or normally closed quick-opening return water valve is higher and the size is littleer, therefore make this condenser hot well liquid level control device for steam turbine's liquid level control precision higher to more do benefit to this condenser hot well liquid level control device for steam turbine's miniaturized design, thereby can reduce occupation space.
Drawings
FIG. 1 is a schematic structural diagram of a condenser hot well liquid level regulating device for a steam turbine in the prior art;
fig. 2 is the utility model discloses a steam turbine is with hot well liquid level control device of condenser's structural schematic.
In the figure: 10. a condenser; 101. a hot well; 20. a normally open water pump; 30. a condensate main pipe; 301. a first outlet; 40. a water discharge pipeline; 50. a first filter; 60. a normally closed quick-opening drain valve; 70. a water return pipe; 80. a normally closed quick-opening water return valve; 90. a second filter; 100. a water tank; 101. a water replenishing pipe; 102. an overflow pipe; 110. a liquid level sensor; 120. and a controller.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.
Referring to fig. 2, a condenser hot well liquid level adjusting device for a steam turbine according to a preferred embodiment of the present invention is shown, which comprises a hot well 101 located at a lower portion of a condenser 10, a liquid level sensor 110 for monitoring a liquid level change of the hot well 101, a controller 120, a water pump, 30 channels of a main condensate pipe, a water discharge pipe 40, a normally closed quick-opening drain valve 60, a water return pipe 70, a normally closed quick-opening water return valve 80, and a water tank 100, wherein an inlet of the main condensate pipe 30 is communicated with the hot well 101, a first outlet 301 of the main condensate pipe 30 is communicated with an external drainage system, the main condensate pipe 30 is provided with a normally open water pump 20, the normally open water pump 20 is a centrifugal pump, the water discharge pipe 40 is communicated with the water tank 100 and a second outlet of the main condensate pipe 30, the drainage pipe 40 is provided with the normally closed quick-opening drain valve 60, the water return pipe 70 is communicated with the hot well 101 and the, the water pump, the liquid level sensor 110, the normally closed quick-opening drain valve 60 and the normally closed quick-opening return valve 80 are all electrically connected with the controller 120, and the controller 120 is used for receiving a liquid level signal of the liquid level sensor 110 and controlling the normally closed quick-opening drain valve 60 and the normally closed quick-opening return valve 80 to be opened or closed according to the liquid level signal so as to adjust the liquid level in the hot well 101 to a stable state.
The working principle of the condenser hot well liquid level adjusting device for the steam turbine is as follows:
when the liquid level in the hot well 101 is in a stable state, the normally closed quick-opening drain valve 60 and the normally closed quick-opening return valve 80 are both in a closed state, and condensed water in the hot well 101 is drained to an external drainage system by the normally open water pump 20;
when the liquid level in the hot well 101 is lower than a set minimum liquid level, the liquid level sensor 110 detects that the liquid level of the hot well 101 is lower than the set minimum liquid level, the controller 120 receives a liquid level signal of the liquid level sensor 110 and controls the normally closed and quickly opened water return valve 80 to be opened according to the liquid level signal, so that water in the water tank 100 flows into the hot well 101 to replenish water to the hot well 101, the water level is prevented from being too low, and the normally closed and quickly opened water return valve 80 is closed until the liquid level in the hot well 101 is normal;
when the liquid level in the hot well 101 is higher than the set maximum liquid level, the liquid level sensor 110 detects that the liquid level of the hot well 101 is higher than the set maximum liquid level, the controller 120 receives the liquid level signal of the liquid level sensor 110 and controls the drain valve to be opened according to the liquid level signal, and simultaneously, the outlet flow of the normally open water pump 20 is automatically increased, so that the water in the hot well 101 is drained to an external drainage system or water tank 100 from the hot well 101 until the liquid level in the hot well 101 is recovered to be normal, and the normally closed quickly open drain valve 60 is closed.
The utility model discloses a steam turbine is with condenser hot well liquid level adjusting device can the liquid level of automatically regulated hot well 101, makes the liquid level of hot well 101 remain stable, and it only just can start normally closed quick-open drain valve 60 or normally closed quick-open return water valve 80 at hot well 101 liquid level abnormal state, and need not open normally closed quick-open drain valve 60 always, and the steam turbine of this kind of structure is with condenser hot well liquid level adjusting device's structure more practices thrift the electric energy to can reduce fortune dimension cost. In addition, because the precision of normally closed quick-opening drain valve 60 or normally closed quick-opening return water valve 80 is higher and the size is littleer, therefore make this condenser hot well liquid level control device for steam turbine's liquid level control precision higher to more do benefit to this condenser hot well liquid level control device for steam turbine's miniaturized design, thereby can reduce occupation space.
In a preferred embodiment, two water return pipes 70 are provided, and the number of the normally closed quick-opening water return valves 80 is equal to the number of the water return pipes 70, so that the water replenishing efficiency can be increased.
Further, a first filter 50 for filtering impurities is arranged on the drain pipe, and the first filter 50 is located between the second outlet of the main condensed water pipe 30 and the normally closed quick-opening drain valve 60, so that the impurities in the condensed water are prevented from being stuck in the normally closed quick-opening drain valve 60.
Further, a second filter 90 for filtering impurities is disposed on the water return pipe 70, and the second filter 90 is disposed between the normally closed quick-opening water return valve 80 and the water tank 100 to prevent impurities in the water pumped from the water tank 100 from blocking the normally closed quick-opening water return valve 80.
Further, the water tank 100 is provided with a water replenishing port and a water discharging port, the water replenishing port is communicated with an external water source system through a water replenishing pipe 101 for replenishing water to the water tank 100, and the water discharging port is communicated with an external water discharging system through an overflow pipe 102 for discharging excessive water in the water tank 100.
In a preferred embodiment, the liquid level sensor 110 may be a liquid level transmitter for detecting a liquid level change of the hot well 101 and transmitting a detected liquid level rising or falling signal to the controller 120, so that the controller 120 controls the opening or closing of the normally closed quick-opening drain valve 60 and the normally closed quick-opening return valve 80.
Of course, the liquid level sensor 110 may also include a high liquid level sensor 110 and a low liquid level sensor 110, the high liquid level sensor 110 being used for detecting a high liquid level of the thermal well 101, and the low liquid level sensor 110 being used for detecting a low liquid level of the thermal well 101.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.
Claims (7)
1. Condenser hot well liquid level adjusting device for steam turbine, including the hot well, be used for monitoring level sensor and the controller of the liquid level change of hot well, its characterized in that still includes water tank, condensate trunk line, drainage pipe and return water pipe, the entry and the hot well intercommunication of condensate trunk line, the first export and the external drainage system intercommunication of condensate trunk line, be equipped with normally open water pump on the condensate trunk line, the drainage pipe intercommunication the water tank with the second export that the condensate trunk was responsible for to dispose the fast-open drain valve of normal close on the drainage pipe, return water pipe intercommunication the hot well with the water tank, be equipped with the fast-open return water valve of normal close on the return water pipe, water pump, level sensor, the fast-open drain valve of normal close, the fast-open return water valve of normal close all with the controller electricity is connected, when the liquid level in the hot well is higher than when setting for the highest liquid level, and when the liquid level in the hot well is lower than the set lowest liquid level, the normally closed quick-opening water return valve is opened, so that the water in the water tank flows into the hot well.
2. The steam turbine condenser hot well liquid level adjusting device as claimed in claim 1, wherein the number of the water return pipes is two, and the number of the normally closed quick-opening water return valves is equal to the number of the water return pipes.
3. The apparatus of claim 1, wherein the drain pipe is provided with a first filter, and the first filter is located between the second outlet of the main condensate pipe and the normally closed quick-opening drain valve.
4. A condenser hot well liquid level regulating device for a steam turbine according to claim 1, wherein a second filter is provided on the return pipe, and the second filter is located between the normally closed quick-opening return valve and the water tank.
5. The liquid level adjusting device for the steam turbine condenser hot well as claimed in claim 1, wherein the water tank is provided with a water replenishing port and a water discharging port, the water replenishing port is used for being communicated with an external water source system to replenish water in the water tank, and the water discharging port is used for being communicated with an external water discharging system to discharge excessive water in the water tank.
6. The apparatus of claim 1, wherein the liquid level sensor is a liquid level transmitter for detecting a liquid level change of the hot well and transmitting a detected liquid level up or down signal to the controller.
7. The apparatus of claim 1, wherein the level sensor comprises a high level sensor for detecting a high level of the hot well and a low level sensor for detecting a low level of the hot well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922371261.5U CN211854955U (en) | 2019-12-25 | 2019-12-25 | Liquid level adjusting device for condenser hot well for steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922371261.5U CN211854955U (en) | 2019-12-25 | 2019-12-25 | Liquid level adjusting device for condenser hot well for steam turbine |
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| Publication Number | Publication Date |
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| CN211854955U true CN211854955U (en) | 2020-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922371261.5U Active CN211854955U (en) | 2019-12-25 | 2019-12-25 | Liquid level adjusting device for condenser hot well for steam turbine |
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| CN (1) | CN211854955U (en) |
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- 2019-12-25 CN CN201922371261.5U patent/CN211854955U/en active Active
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