CN220646223U - 700MW unit circulating water pump broken shaft protection system - Google Patents
700MW unit circulating water pump broken shaft protection system Download PDFInfo
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- CN220646223U CN220646223U CN202321397132.3U CN202321397132U CN220646223U CN 220646223 U CN220646223 U CN 220646223U CN 202321397132 U CN202321397132 U CN 202321397132U CN 220646223 U CN220646223 U CN 220646223U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 238000001816 cooling Methods 0.000 claims abstract description 16
- 239000000498 cooling water Substances 0.000 claims abstract description 8
- 230000008676 import Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 241000242583 Scyphozoa Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
A700 MW unit circulating water pump broken shaft protection system. At present, the circulating water pump is arranged far away from the condenser, if the circulating water pump is disconnected, the standby circulating water pump is started in a linked mode, but the circulating water flows back due to the fact that an outlet butterfly valve is not connected in a linked mode, and the condenser loses circulating water. A700 MW unit circulating water pump broken axle protection system, its constitution includes: the cooling tower (1), low pressure condenser (15) and high pressure condenser (16), the cooling tower passes through condenser outlet pipe and is connected with the high pressure condenser, the cooling tower passes through condenser inlet pipe and is connected with the low pressure condenser, the high pressure condenser passes through cooling water outlet pipe and cooling water inlet pipe and is connected with the low pressure condenser, the cooling tower is connected with three circulating pump outlet pipe parallel connection, circulating pump outlet pipe and condenser inlet pipe are connected, install circulating pump and circulating pump outlet pressure valve and circulating pump outlet butterfly valve connection on every circulating pump outlet pipe respectively. The utility model is applied to the field of circulating water pumps.
Description
Technical Field
The utility model relates to a broken shaft protection system of a 700MW unit circulating water pump.
Background
The circulating water is an important auxiliary machine of the thermal power generating unit, the circulating water pump is high in power, low in rotating speed and high in pump shaft power, and the safe and stable operation of the circulating water pump is an important guarantee for guaranteeing the safe operation of the unit. For the 700MW unit, the circulating water pump is arranged far away from the condenser, if the circulating water pump is disconnected, the standby circulating water pump is started in a linked mode, but the circulating water flows back due to the fact that an outlet butterfly valve is not connected, so that the condenser loses circulating water, the condenser is in vacuum low-protection action, and the unit trips. Therefore, ensuring the safety of the circulating water is an important guarantee for ensuring the safe operation of the unit.
And the circulating pumps are arranged at a position 50 m away from the factory building, three circulating pumps are arranged, when the machine set operates normally, two circulating pumps AB operate, the circulating pumps C are standby, the circulating pumps B are disconnected, the circulating pump current suddenly drops, the condenser vacuum suddenly rises to a tripping value within 40 seconds, and the machine set trips. After the shaft of the circulating pump is disconnected, the butterfly valve is not connected, although the standby circulating pump is connected and started, a large amount of circulating pump water flows backwards, the condenser loses circulating water, and the unit loses circulating water tripping.
Disclosure of Invention
The utility model aims to provide a broken shaft protection system of a circulating water pump of a 700MW unit.
The above object is achieved by the following technical scheme:
a700 MW unit circulating water pump broken axle protection system, its constitution includes: the cooling tower is connected with the high-pressure condenser through a condenser outlet pipe, the cooling tower is connected with the low-pressure condenser through a condenser inlet pipe, the high-pressure condenser is connected with the low-pressure condenser through a cooling water outlet pipe and a cooling water inlet pipe, the cooling tower is connected with three circulating pump outlet pipes in parallel, the circulating pump outlet pipes are connected with the condenser inlet pipes, and each circulating pump outlet pipe is respectively provided with a circulating pump, a circulating pump outlet valve and a circulating pump outlet butterfly valve.
The 700MW unit circulating water pump broken shaft protection system, condenser import pipe on be equipped with condenser outer lane import butterfly valve and condenser inner circle import butterfly valve, condenser outer lane water inlet pressure valve and condenser inner circle pressure valve respectively.
The 700MW unit circulating water pump broken shaft protection system, condenser outlet pipe on be equipped with condenser outer lane export butterfly valve and condenser inner circle export butterfly valve respectively.
The utility model has the beneficial effects that:
1. the utility model utilizes the circulating pump outlet pressure of the C circulating pump outlet pressure valve, the circulating pump inlet pressure valve of the condenser outer ring, the condenser inner ring pressure valve and the C circulating pump current less than 182A (the normal operation current is 280 x 0.65, the circulating pump has been operated for 90 seconds, the four conditions are all satisfied, the butterfly valve of the circulating pump is connected, the low current when the circulating pump is started is avoided after the circulating pump is operated for 90 seconds, the shaft breakage of the circulating pump is avoided when the current feedback is normal after the circulating pump is started, the shaft breakage action is ensured and the shaft breakage misoperation is avoided if the conditions are reached.
2. When the circulating water pump breaks the shaft during operation, the outlet butterfly valve can be quickly closed, so that the phenomenon that circulating water does not flow backwards, and the condenser loses the circulating water is avoided, and the safe operation of the unit is ensured. The protection of the broken shaft of the circulating pump is added, if the A-level alarm is sent immediately after the broken shaft of the circulating pump, the outlet butterfly valve is simultaneously connected, the safety of circulating water of the unit is ensured, an operator does not need to manually close the outlet butterfly valve, and the operator only checks that the outlet butterfly valve is normally closed, so that the expansion of an event caused by the fact that the operator finds out not timely is avoided.
3. After the technical improvement of the utility model, the unit operates normally, and no misoperation occurs, and after the pump of other units is disconnected at one time, the outlet butterfly valve is connected normally, the circulating water pressure is stable, the condenser vacuum is normal, the occurrence of the failure of the circulating water tripping event of the condenser is avoided, and the safe and stable operation of the unit is ensured. At present, each power plant controls the non-stop index of the unit very tightly, the non-stop index is 0.5 unit/year/unit, the non-stop primary company of the unit checks for 70 ten thousand yuan, and the non-stop aggravation check is repeated. Once the unit is started, the country consumes 60 ten thousand yuan.
Drawings
Fig. 1 is a schematic diagram of the structure of the present utility model.
Fig. 2 is a logic diagram of broken axle protection.
1 cooling tower, 2A circulation pump, 3A circulation pump outlet pressure valve, 4A circulation pump outlet butterfly valve, 5B circulation pump, 6B circulation pump outlet pressure valve, 7B circulation pump outlet butterfly valve, 8C circulation pump, 9C circulation pump outlet pressure valve, 10C circulation pump outlet butterfly valve, 11 condenser outer race water inlet pressure valve, 12 condenser inner race pressure valve, 13 condenser outer race inlet butterfly valve, 14 condenser inner race inlet butterfly valve, 15 low pressure condenser A, 16 high pressure condenser B, 17 condenser inner race outlet butterfly valve, 18 condenser outer race outlet butterfly valve.
Detailed Description
Examples
A700 MW unit circulating water pump broken axle protection system, its constitution includes: the cooling tower 1, the low-pressure condenser 15 and the high-pressure condenser 16, the cooling tower pass through condenser outlet pipe with the high-pressure condenser be connected, the cooling tower pass through condenser inlet pipe and be connected with the low-pressure condenser, the high-pressure condenser pass through cooling water outlet pipe and cooling water inlet pipe and be connected with the low-pressure condenser, the cooling tower with three circulating pump outlet pipe parallel connection, the circulating pump outlet pipe with condenser inlet pipe connect, every the circulating pump outlet pipe on install respectively and circulate pump and pump outlet pressure valve and circulating pump outlet butterfly valve and be connected.
The 700MW unit circulating water pump broken shaft protection system, condenser import pipe on be equipped with condenser outer lane import butterfly valve 13 and condenser inner circle import butterfly valve 14, condenser outer lane water inlet pressure valve 11 and condenser inner circle pressure valve 12 respectively.
The 700MW unit circulating water pump broken shaft protection system, condenser outlet pipe on be equipped with condenser outer lane export butterfly valve 18 and condenser inner circle export butterfly valve 17 respectively.
Broken shaft protection logic:
the circulating pump is operated for 90 seconds, so that the phenomenon that the circulating pump current is low during starting, the pressure is low, the circulating pump is broken, the shaft is protected from being accidentally sent, and the outlet butterfly valve is closed in an action mode.
Pump-following off-axis interlock protection control logic:
the pressure of the circulating pump is less than 125KPa, the pressure AB of the main pipe is less than 125KPa, the circulating pump is operated for 90 seconds, the circulating pump current is less than 182A (the normal operation current is 280 times 0.65), and the conditions are met, and the circulating pump outlet butterfly valve is connected.
The pump is prevented from being started by the aid of the pump outlet pressure, the circulating jellyfish pipe pressure and the pump circulating current < 182A (the normal running current is 280 times 0.65, the pump circulating operation is completed for 90 seconds), the four conditions are met, the butterfly valve of the pump circulating pump is connected, the current is prevented from being low when the pump circulating is started after the pump circulating is operated for 90 seconds, after the current is fed back normally after the pump circulating is started, the pump circulating is stopped when the condition is achieved, the pump circulating is judged to be disconnected, the reliable pump circulating disconnected shaft action is ensured, and the shaft interruption misoperation is avoided.
After the technical improvement, the unit operates normally, and the situation of misoperation does not occur, so that the safe and stable operation of the unit is ensured.
Claims (3)
1. A700 MW unit circulating water pump broken axle protection system, its constitution includes: cooling tower, low pressure condenser and high pressure condenser, characterized by: the cooling tower pass through condenser outlet pipe with high-pressure condenser be connected, the cooling tower pass through condenser inlet pipe and low-pressure condenser be connected, high-pressure condenser pass through cooling water outlet pipe and cooling water inlet pipe with low-pressure condenser be connected, the cooling tower with three circulating pump outlet pipe parallel connection, the circulating pump outlet pipe with condenser inlet pipe connect, every the circulating pump outlet pipe on install respectively and circulate pump and pump outlet pressure valve and pump outlet butterfly valve connection.
2. The 700MW unit circulating water pump broken axle protection system according to claim 1, characterized in that: the inlet pipe of the condenser is respectively provided with a butterfly valve at the inlet of the outer ring of the condenser, a butterfly valve at the inlet of the inner ring of the condenser, a water inlet pressure valve at the outer ring of the condenser and a pressure valve at the inner ring of the condenser.
3. The 700MW unit circulating water pump broken axle protection system according to claim 1, characterized in that: the condenser outer ring outlet butterfly valve and the condenser inner ring outlet butterfly valve are respectively arranged on the condenser outlet pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321397132.3U CN220646223U (en) | 2023-06-04 | 2023-06-04 | 700MW unit circulating water pump broken shaft protection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321397132.3U CN220646223U (en) | 2023-06-04 | 2023-06-04 | 700MW unit circulating water pump broken shaft protection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220646223U true CN220646223U (en) | 2024-03-22 |
Family
ID=90293569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321397132.3U Active CN220646223U (en) | 2023-06-04 | 2023-06-04 | 700MW unit circulating water pump broken shaft protection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220646223U (en) |
-
2023
- 2023-06-04 CN CN202321397132.3U patent/CN220646223U/en active Active
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