CN217819263U - Constant-pressure continuous replacement system for cooling water tank of generator stator - Google Patents
Constant-pressure continuous replacement system for cooling water tank of generator stator Download PDFInfo
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- CN217819263U CN217819263U CN202220910420.3U CN202220910420U CN217819263U CN 217819263 U CN217819263 U CN 217819263U CN 202220910420 U CN202220910420 U CN 202220910420U CN 217819263 U CN217819263 U CN 217819263U
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Abstract
The utility model provides a constant-pressure continuous replacement system for a generator stator cooling water tank, which comprises a first pressure reducing valve, a first isolation valve, a second isolation valve, a pressure gauge, a needle valve, a third isolation valve, a hydrogen concentration detector, a fourth isolation valve, a first constant-pressure valve, a flowmeter, a fixed cooling water tank and a nitrogen cylinder; the nitrogen cylinder export is through first relief pressure valve switch-on main line, the main line communicates in proper order on the road has first isolating valve, the needle valve, decide the cold water storage cistern, the fourth isolating valve, first constant pressure valve and flowmeter, between first isolating valve and needle valve, still be provided with the manometer, the manometer passes through second isolating valve and main line intercommunication, it is provided with the hydrogen concentration detector to decide between cold water storage cistern and the fourth isolating valve, the hydrogen concentration detector passes through third isolating valve and main line intercommunication. The utility model discloses can realize the incessant continuous replacement to deciding hydrogen in the cold water storage cistern, greatly reduced operating personnel work load.
Description
Technical Field
The utility model relates to a thermal power technical field, concretely relates to generator stator cooling water tank constant voltage is replacement system in succession.
Background
In order to solve the problem that the generator generates heat due to the fact that current flows through the stator bar when the generator operates, the generator is provided with a set of stator cooling water system. Through a plurality of hollow bars, cooling water is continuously introduced into the bars to take away heat generated in the bars.
As most domestic large generators are hydrogen-cooled generators, namely, the generator rotor and the iron core surface are cooled by hydrogen. In order to ensure the hydrogen cooling effect and avoid the leakage of the stator cooling water into the generator, the hydrogen pressure of the generator is set to be high in stator cooling water pressure. The rated hydrogen pressure of a common large and medium-sized generator is 0.4MPa, and the stator cooling water pressure is about 0.25MPa. And the stator bar is connected with the stator cooling water inlet and outlet pipes by the connectors. Inevitably, there are imprecise places where hydrogen will leak into the stator cooling water. And the cooling water along the stator is collected in the stator cooling water tank. Resulting in accumulation of hydrogen gas in the water tank and increase in hydrogen gas concentration.
In order to monitor the hydrogen leakage amount of the generator and avoid the hydrogen concentration of the cooling water exceeding the explosion limit, in recent years, hydrogen concentration detection devices are additionally arranged in a plurality of generator stator cooling water tanks and are generally arranged at the top of an exhaust pipe of the water tank.
According to the requirement of countermeasures, the concentration of hydrogen in the stator cooling water tank is not more than 4%. Generally, when the hydrogen concentration detection device detects that the concentration of hydrogen in the water tank is increased to 2% -3%, an alarm is sent out, and after an alarm signal is received, an operator can manually operate a relevant valve to perform replacement operation, namely, nitrogen is filled into the stator cooling water tank through a nitrogen cylinder and a nitrogen filling pipeline, hydrogen is discharged, and the concentration of the hydrogen is reduced. In order to prevent air from leaking into the stator cooling water tank, the nitrogen is filled to ensure the micro-positive pressure in the water tank. A conventional stator cooling water system can be seen in fig. 1.
However, in the prior art, because the hydrogen density is low, even if trace hydrogen leaks into a stator cooling water system, the hydrogen floats to the top of a water tank and is detected by a hydrogen concentration detector, and the concentration exceeding alarm is triggered. Thus, the detected concentration value cannot represent the entire tank concentration level. Although trace hydrogen leakage does not reflect the actual concentration of the water tank, the numerical value exceeds the standard, manual replacement has to be carried out, so that a large amount of human resource waste is brought, and the labor intensity of personnel is increased. And frequent nitrogen replacement, basically, a batch of nitrogen bottles are consumed in each replacement work, and the nitrogen consumption cost is high.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model provides a constant-pressure continuous replacement system for a cooling water tank of a generator stator, which comprises a first pressure reducing valve, a first isolation valve, a second isolation valve, a pressure gauge, a needle valve, a third isolation valve, a hydrogen concentration detector, a fourth isolation valve, a first constant-pressure valve, a flowmeter, a cooling water tank and a nitrogen cylinder; the nitrogen cylinder export is through first relief pressure valve switch-on main line, the last intercommunication in proper order of main line has first isolating valve, needle valve, decide cold water tank, fourth isolating valve, first constant pressure valve and flowmeter, the flowmeter export passes through pipeline and atmosphere intercommunication. And a pressure gauge is further arranged between the first isolation valve and the needle valve and is communicated with the main pipeline through a second isolation valve, a hydrogen concentration detector is arranged between the constant-cold water tank and the fourth isolation valve and is communicated with the main pipeline through a third isolation valve.
In one embodiment, the water seal device further comprises a sixth isolation valve, a seventh isolation valve and a water seal device, wherein an inlet of the water seal device is communicated between the needle valve and the fixed cold water tank on the main pipeline through the sixth isolation valve, and the on-off of the needle valve and the fixed cold water tank is controlled through the seventh isolation valve.
In one embodiment, the system further comprises a second pressure reducing valve and a fifth isolating valve which are arranged on the main pipeline, and the second pressure reducing valve and the fifth isolating valve are arranged between the first isolating valve and the needle valve in sequence.
In one embodiment, the hydraulic seal device further comprises a second constant pressure valve which is arranged between the sixth isolation valve and the water seal device.
In one embodiment, the device further comprises a bypass valve, wherein the bypass valve is arranged between the needle valve and the seventh isolation valve and is communicated with a bypass pipeline which is connected with the sixth isolation valve in parallel.
In one embodiment, the sewage treatment system further comprises a first sewage discharge valve, wherein the first sewage discharge valve is arranged on a first sewage discharge pipeline, and the first sewage discharge pipeline is arranged between the fifth isolation valve and the needle valve.
In one embodiment, the sewage treatment device further comprises a second sewage draining valve, wherein the second sewage draining valve is arranged on a second sewage draining pipeline, and the second sewage draining pipeline is arranged on the water sealing device.
In one embodiment, the pressure meter and flow meter include a data transmission module.
In one embodiment, a pressure transmitter is also included, the pressure transmitter being located between the seventh isolation valve and the fourth isolation valve.
The utility model discloses can realize the incessant continuous replacement to deciding hydrogen in the cold water storage cistern, through the numerical value trend of change of record flowmeter, can reach the purpose of monitoring the increase of hydrogen leakage volume equally, avoid hydrogen gathering in the water tank to exceed explosion limit, eliminate the hydrogen and explode the hidden danger. And after the system is put into operation, the nitrogen consumption is greatly reduced, and the workload of operators is greatly reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
FIG. 1 is a schematic diagram of a conventional generator stator cooling water system;
FIG. 2 is a schematic view of a constant pressure continuous replacement system for a cooling water tank of a generator stator according to a first embodiment of the present invention;
FIG. 3 is a schematic view of a constant pressure continuous replacement system for a cooling water tank of a generator stator according to a second embodiment of the present invention;
FIG. 4 is a schematic view of a constant pressure continuous replacement system for a cooling water tank of a generator stator according to a third embodiment of the present invention;
fig. 5 is a schematic view of a constant-pressure continuous replacement system for a cooling water tank of a generator stator according to a fourth embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
The utility model provides a generator stator cooling water tank constant voltage is replacement system in succession, as shown in figure 2, including first relief pressure valve 1, first isolation valve 2, second isolation valve 5, manometer 6, needle valve 8, third isolation valve 12, hydrogen concentration detector 13, fourth isolation valve 14, first constant pressure valve 15, flowmeter 20, decide cold water storage cistern 30, nitrogen gas bottle 40. An outlet of the nitrogen cylinder 40 is communicated with a main pipeline through a first pressure reducing valve 1, and the main pipeline is sequentially communicated with a first isolation valve 2, a needle valve 8, a cold water tank 30, a fourth isolation valve 14, a first constant pressure valve 15 and a flowmeter 20. And a pressure gauge 6 is also arranged between the first isolation valve 2 and the needle valve 8, and the pressure gauge 6 is communicated with the main pipeline through a second isolation valve 5. A hydrogen concentration detector 13 is arranged between the cooling water tank 30 and the fourth isolation valve 14, and the hydrogen concentration detector 13 is communicated with the main pipeline through the third isolation valve 12.
Therefore, in the embodiment, the nitrogen gas cylinder 40 is connected to the stator cooling water system for a long time to fill nitrogen gas into the system, the first pressure reducing valve 1 is used for controlling the nitrogen filling pressure of the fixed cold water tank 30, the pressure gauge 6 is used for monitoring the pressure after pressure reduction, the needle valve 8 is used for limiting the nitrogen filling flow of the fixed cold water tank 30, and the first constant pressure valve 15 is used for maintaining the micro-positive pressure of the fixed cold water tank 30. The purpose of monitoring whether the hydrogen leakage amount is increased or not can be achieved through the numerical value change trend of the flowmeter 20, so that the size of the needle valve 8 can be adjusted according to the reading of the flowmeter 20, and the nitrogen output flow of the nitrogen cylinder 40 can be further adjusted. Thereby avoiding excessive consumption of nitrogen gas caused by adjusting the nitrogen gas output flow rate of the nitrogen gas cylinder 40 based only on the data of the hydrogen concentration detector 13.
This embodiment can realize deciding the incessant continuous replacement of hydrogen in the cold water storage cistern, under the prerequisite of avoiding prior art needs artifical periodic replacement, avoids hydrogen gathering in the water tank to exceed explosion limit, eliminates the hydrogen explosion hidden danger. And, owing to the above-mentioned institutional advancement to the cooling pipe network, can make the accurate balanced relation of controlling nitrogen gas output quantity and hydrogen leakage quantity of technical staff, avoid only based on the excessive consumption of nitrogen gas that nitrogen gas output flow of hydrogen concentration detector 13's data adjustment nitrogen cylinder 40 caused, the system is put into operation the back, and the nitrogen gas quantity significantly reduces. Thereby greatly reducing the workload of operators and reducing the replacement work of once operation every day to 15 days for replacing the gas cylinder.
As shown in fig. 3, in one embodiment, the system further comprises a sixth isolation valve 9, a seventh isolation valve 11 and a hydro seal 19. The inlet of the water seal device 19 is communicated between the needle valve 8 on the main pipeline and the fixed cold water tank 30 through a sixth isolation valve 9, and the on-off of the fixed cold water tank 30 is controlled through a seventh isolation valve 11.
By providing the water seal 19, when the flowmeter 20 fails, the water seal breaks and the exhaust gas is discharged from the water seal through the discharge pipe 18, so that the normal exhaust of the system is not affected and the overpressure of the cooling water tank is prevented.
In one embodiment, the system further comprises a second pressure reducing valve 3 and a fifth isolating valve 4 which are arranged on the main pipeline, the second pressure reducing valve 3 and the fifth isolating valve 4 are sequentially arranged between the first isolating valve 2 and the second isolating valve 5, and the nitrogen pressure can be greatly reduced through two-stage pressure reduction, so that fine flow control is facilitated. And, when the second reducing valve 3 is failed, the first isolation valve 2 and the fifth isolation valve 4 can realize online maintenance of the second reducing valve 3.
In one embodiment, the system further comprises a second constant pressure valve 10, the second constant pressure valve 10 being arranged between the sixth isolation valve 9 and the water seal arrangement 19. Through the arrangement of the second constant pressure valve 10, the pressure relief can be automatically opened when the inlet pressure of the water tank exceeds 35kPa, and the overpressure protection of the water tank is realized. Meanwhile, the water tank can be used for standby of the constant pressure valve 15, when the constant pressure valve 15 breaks down, the pressure of the water tank exceeds 35kPa, the constant pressure valve 10 is opened, the pressure of the water tank is maintained at 35kPa, and double protection of the water tank is realized.
In one embodiment, the system further comprises a bypass valve 17, as shown in fig. 4, the bypass valve 17 being provided between the needle valve 8 and the seventh isolation valve 11, communicating with a bypass line in parallel with the sixth isolation valve 9, so that a pressure relief effect in case of a fault is achieved.
In one embodiment the system further comprises a first blow down valve 7, as shown in fig. 5, the first blow down valve 7 being arranged between the fifth isolation valve 4 and the needle valve 8, the first blow down valve 7 being at the lowest point of the system for blow down of the main line.
In one embodiment, the system further comprises a second waste valve 18, wherein the second waste valve 18 is arranged on the second waste pipeline and is arranged on a water seal device 19 and is used for waste disposal when the system pipeline is purged, flushed and cleaned.
In one embodiment, the pressure gauge 6 and the flow meter 20 comprise a data transmission module, which can transmit system pressure and flow signals to a central control room, can realize monitoring of nitrogen charging pressure, can timely process the failure of a pressure reducing valve or the exhaustion of nitrogen, can realize continuous monitoring of exhaust flow, and can timely find the increasing trend of hydrogen leakage.
In one embodiment, the system further comprises a pressure transmitter, which is arranged on the pipeline between the seventh isolation valve 11 and the fourth isolation valve 14, so that the pressure can be transmitted to the central centralized control room, and the continuous monitoring of the pressure of the water tank can be realized.
Through the pipeline arrangement of the embodiment, after the system is started, the isolation valves 2, 4, 5, 9, 11, 12 and 14 are opened, the drain valves 7 and 17 are closed, the bypass valve 10 is closed, the water seal 19 is filled with the brine from the top until water escapes from the drain pipe, the pressure reducing valves 1 and 3 are adjusted to be minimum, the needle valve 8 is closed to be minimum, the pressure of the nitrogen cylinder is confirmed to be normal and is generally larger than 0.1MPa, the pressure reducing valve 1 is slowly adjusted, the outlet pressure of the pressure reducing valve is controlled to be 0.1MPa, the pressure reducing valve 2 is slowly adjusted, the outlet pressure of the pressure reducing valve is controlled to be 0.01MPa, the needle valve 8 is slowly opened, after the pressure of the water tank exceeds 7kPa, the constant pressure valve 15 is automatically opened to maintain the pressure of the water tank to be 7kPa, the size of the needle valve 8 is adjusted according to the reading number of the flowmeter 20, the reading number of the flowmeter 20 is guaranteed to be 0.2 liter/minute, or the flow is confirmed according to the actual situation on site. The opening degree of the needle valve 8 is maintained, the outlet pressure of the nitrogen cylinder is monitored, and if the outlet pressure of the nitrogen cylinder is lower than 0.1MPa, a new nitrogen cylinder is replaced. Can realize deciding incessant continuous replacement of hydrogen in the cold water storage cistern, through the numerical value trend of change of record flowmeter, can monitor and leak the hydrogen volume and increase, avoid hydrogen gathering in the water storage cistern to exceed explosion limit, eliminate the hydrogen explosion hidden danger. The system can keep long-term micro-positive pressure operation, air leakage is avoided, double overpressure protection is provided on the water tank side and the exhaust side of the system, and safe operation of the water tank can be guaranteed. After the signal is remotely transmitted and accessed into the control system, the pressure and the flow of the system can be remotely and continuously monitored. After the system is put into operation, the nitrogen consumption is greatly reduced, the workload of operators is reduced, and the operation is reduced to 15 days per day and the gas cylinder is replaced.
Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (9)
1. A constant-pressure continuous replacement system of a generator stator cooling water tank is characterized in that,
the device comprises a first pressure reducing valve, a first isolating valve, a second isolating valve, a pressure gauge, a needle valve, a third isolating valve, a hydrogen concentration detector, a fourth isolating valve, a first constant pressure valve, a flowmeter, a fixed cold water tank and a nitrogen cylinder;
the outlet of the nitrogen cylinder is communicated with a main pipeline through a first reducing valve,
the main pipeline is sequentially communicated with a first isolating valve, a needle valve, a fixed cold water tank, a fourth isolating valve, a first constant pressure valve and a flowmeter, the outlet of the flowmeter is communicated with the atmosphere through a pipeline,
a pressure gauge is arranged between the first isolation valve and the needle valve and is communicated with the main pipeline through a second isolation valve,
a hydrogen concentration detector is arranged between the fixed cold water tank and the fourth isolating valve and is communicated with the main pipeline through the third isolating valve.
2. The constant pressure continuous replacement system for the cooling water tank of the generator stator of claim 1,
also comprises a sixth isolating valve, a seventh isolating valve and a water seal device,
and the inlet of the water seal device is communicated between the needle valve and the fixed cold water tank on the main pipeline through a sixth isolation valve, and the on-off of the needle valve and the fixed cold water tank is controlled through a seventh isolation valve.
3. The constant pressure continuous replacement system for the cooling water tank of the generator stator as claimed in claim 2,
further comprising a second pressure reducing valve and a fifth isolation valve arranged on the main pipeline,
and the second pressure reducing valve and the fifth isolating valve are sequentially arranged between the first isolating valve and the needle valve.
4. The constant pressure continuous replacement system for the cooling water tank of the generator stator as claimed in claim 2,
the water seal device is characterized by further comprising a second constant pressure valve, wherein the second constant pressure valve is arranged between the sixth isolating valve and the water seal device.
5. The constant pressure continuous replacement system of the cooling water tank of the generator stator as claimed in claim 2,
the needle valve is arranged on the first isolation valve, the needle valve is arranged on the second isolation valve, and the seventh isolation valve is arranged on the fourth isolation valve.
6. The constant pressure continuous replacement system for the cooling water tank of the generator stator as claimed in claim 3,
still include first blowoff valve, first blowoff valve sets up on first blowdown pipeline, first blowdown pipeline set up in the main line least significant end.
7. The constant pressure continuous replacement system of the cooling water tank of the generator stator as claimed in claim 2,
the sewage treatment device is characterized by further comprising a second sewage valve, wherein the second sewage valve is arranged on a second sewage pipeline, and the second sewage pipeline is arranged on the water sealing device.
8. The constant pressure continuous replacement system of the cooling water tank of the generator stator as claimed in claim 1,
the pressure meter and the flow meter comprise a data transmission module.
9. The constant pressure continuous replacement system for the cooling water tank of the generator stator as claimed in claim 2,
the pressure transmitter is positioned between the seventh isolation valve and the fourth isolation valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220910420.3U CN217819263U (en) | 2022-04-19 | 2022-04-19 | Constant-pressure continuous replacement system for cooling water tank of generator stator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220910420.3U CN217819263U (en) | 2022-04-19 | 2022-04-19 | Constant-pressure continuous replacement system for cooling water tank of generator stator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217819263U true CN217819263U (en) | 2022-11-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220910420.3U Active CN217819263U (en) | 2022-04-19 | 2022-04-19 | Constant-pressure continuous replacement system for cooling water tank of generator stator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217819263U (en) |
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2022
- 2022-04-19 CN CN202220910420.3U patent/CN217819263U/en active Active
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