CN210977837U - Device for supplying sealing water to water feeding pump of power plant condensate system - Google Patents
Device for supplying sealing water to water feeding pump of power plant condensate system Download PDFInfo
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- CN210977837U CN210977837U CN201921233047.7U CN201921233047U CN210977837U CN 210977837 U CN210977837 U CN 210977837U CN 201921233047 U CN201921233047 U CN 201921233047U CN 210977837 U CN210977837 U CN 210977837U
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Abstract
The utility model discloses a device of supply with water pump sealing water of power plant's condensate system, including condensate pump, the sealed water system of vapor pump, feed pump and condenser, its characterized in that: the steam pump sealing water system comprises sealing water booster pump A, sealing water booster pump B, bypass, filter screen, subsidiary pipeline and valve, and sealing water booster pump A, sealing water booster pump B and bypass are parallelly connected through pipeline and valve group, the one end and the condensate pump intercommunication of steam pump sealing water system, condensate pump and converter pass through wire electric connection, the one end that the steam pump sealing water system deviates from condensate pump communicates with feed pump A and feed pump B, feed pump A and feed pump B are parallelly connected through pipeline and valve group, feed pump A and feed pump B deviate from the one end and the condenser intercommunication of steam pump sealing water system. The utility model discloses have better stability and interference killing feature, reduce condensate pump's energy consumption simultaneously.
Description
Technical Field
The utility model relates to a power generation facility technical field specifically is a device of supply water pump sealing water of power plant's condensate system.
Background
At present, a steam pump of a 1000MW double-reheating generator set in a certain factory adopts a floating ring sealing mode, a sealing water source is condensed water, and the pressure range is 1.5-3.8 Mpa.
The sealing water return temperature is higher than 90 ℃, the water feeding pump is adjusted in an interlocking mode, in order to ensure the safety of the floating ring sealing of the water feeding pump, the condensate pump adopts frequency conversion adjustment, but higher condensate water pressure needs to be ensured, and therefore the sealing water pressure and the return water temperature are ensured to be normal. Therefore, the coagulation pump runs in a high-frequency state for a long time, the deep frequency conversion cannot be realized, and the power consumption of the coagulation pump is extremely high.
The air pump sealing water flow at the present stage is as follows: condensed water in the condenser is boosted by a variable-frequency condenser pump and then enters a steam pump sealing water system, impurities in the water are filtered out by a filter screen, the sealing water quantity is controlled by a sealing water temperature regulating valve according to the sealing water return water temperature and then enters a water supply pump floating ring sealing cooling system, and the sealing water return water is recycled to the condenser.
The logic of the condensed water control is that the water feeding main regulating valve of the deaerator maintains the water level of the deaerator at a set value by regulating three impulse quantities according to the water level of the deaerator, the water inlet flow rate of the deaerator and the water supply quantity. The condensate pump frequency-converts the condensate pressure, which is a function of the load.
However, the sealing water system and condensate control logic currently employed may lead to the following: if the condensate system breaks down, the pressure of the condensate pump outlet suddenly drops, and the temperature of the sealing water can suddenly rise due to certain hysteresis of the sealing water temperature regulating valve, so that the two feed pumps trip, and unnecessary non-stop of the unit is caused.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a device of supply with water pump sealing water of power plant's condensate system to solve the problem that proposes in the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a device of feed pump sealing water of power plant's condensate system, includes condensate pump, the sealed water system of steam pump, feed pump and condenser, the sealed water system of steam pump comprises sealed water booster pump A, sealed water booster pump B, bypass, filter screen, subsidiary pipeline and valve, and sealed water booster pump A, sealed water booster pump B and bypass are parallelly connected through pipeline and valve group, the one end and the condensate pump intercommunication of the sealed water system of steam pump, condensate pump passes through wire electric connection with the converter, the sealed water system of steam pump deviates from condensate pump's one end and feed pump A and feed pump B intercommunication, feed pump A and feed pump B are parallelly connected through pipeline and valve group, feed pump A and feed pump B deviate from the one end and the condenser intercommunication of the sealed water system of steam pump.
Preferably, the sealing water booster pump A and the sealing water booster pump B are respectively provided with a recirculation pipeline for ensuring the minimum flow rate when the sealing water booster pump A and the sealing water booster pump B start or stop, and preventing the sealing water booster pump A and the sealing water booster pump B from cavitation.
Preferably, the seal water booster pump A and the seal water booster pump share one bypass system, when the seal water booster pump A and the seal water booster pump B are not started, the seal water is supplied to the water feeding pump by condensed water, the bypass system is provided with a check valve, and after the booster pump is started, the check valve is closed; when the operating booster pump is tripped and the standby booster pump cannot be started in an interlocking manner, the check valve is opened, and the condensed water is supplied to the water supply pump to seal water, so that the sealing water is ensured not to be interrupted.
Preferably, a sealing water regulating valve is arranged between the steam pump sealing water system and the water feeding pump A and the water feeding pump B, the sealing water regulating valve regulates the amount of sealing water entering the water feeding pump, cooling of the sealing ring is guaranteed, and sealing water return water is finally recycled to the condenser.
Preferably, the operating pressure of the condensed water system is 1.5MPa to 3.8MPa, the sealing water pressure of the water feeding pump A and the water feeding pump B is 1.5MPa to 3.8MPa, the inlet pressure of the sealing water booster pump A and the sealing water booster pump B is 0.9MPa to 3.5MPa, the lift of the sealing water booster pump A and the sealing water booster pump B is 170m, and the sealing water flow rate of the water feeding pump A and the water feeding pump B is 17L/s.
Compared with the prior art, the beneficial effects of the utility model are that: the existing air pump sealing water system and control logic are improved, so that the air pump sealing water system has good stability and anti-interference capability, and meanwhile, the energy consumption of a condensate pump is reduced.
Drawings
FIG. 1 is a block diagram of the frequency conversion pressure regulation control of a condensate pump of the present invention;
FIG. 2 is a diagram of the steam pump sealing water system after modification;
fig. 3 is the utility model discloses a frequency conversion water level control block diagram of condensate pump.
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. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element to which the reference is made must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, and for example, "connected" may be either fixedly connected or detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 to 3, an embodiment of the present invention provides a device for supplying sealing water to a water feed pump of a condensate system of a power plant, including a condensate pump, a steam pump seal water system, a water feed pump and a condenser, wherein the operating pressure of the condensate system is 1.5MPa-3.8MPa, the steam pump seal water system is composed of a seal water booster pump a, a seal water booster pump B, a bypass, a filter screen, an auxiliary pipeline and a valve, the seal water booster pump a, the seal water booster pump B and the bypass are connected in parallel through the pipeline and the valve set, the seal water booster pump a, the inlet pressure of the seal water booster pump B is 0.9MPa-3.5MPa, the seal water booster pump a, the lift of the seal water booster pump B is 170m, the seal water booster pump a and the seal water booster pump B are respectively provided with recirculation pipelines for ensuring the minimum flow rate when the seal water booster pump a, the seal water feed pump B is started or stopped, the seal water booster pump B prevents the seal water booster pump a, the seal water booster pump B from corroding, one end of the seal water pump seal water system is communicated with the condensate pump, the condensate pump is electrically connected with the water feed pump through the water pump, the seal water pump B is communicated with the seal water pump, the seal water pump B, the seal water pump B is communicated with the seal water pump, the seal water pump B is communicated with the seal water pump, the seal.
The working principle is as follows: as shown in fig. 2, one path of the condensed water miscellaneous user main pipe is taken, and is divided into three paths after passing through a water inlet main valve of a sealed water system; the first path and the second path respectively enter the two booster pumps for boosting after passing through the manual isolation valves, and enter a water supply pump sealing water main pipe after passing through the check valve and the manual valve at the outlet of the booster pumps, the sealing water main pipe is provided with two filter screens and inlet and outlet isolation valves thereof, and after impurities are filtered, the impurities respectively enter driving end and non-driving end sealing rings of the two water supply pumps through four pressure regulating valves. And the third path enters the sealed water main pipe after passing through the check valve and the front and rear manual isolation valves of the check valve.
A recirculation pipeline is arranged between the outlet of the booster pump and the check valve, and the recirculation pipeline is provided with an electric isolation valve and a manual isolation valve.
The control system of the invention adjusts the condensate water pressure under different loads of the unit, ensures the minimum control requirement of the condensate water main pipe pressure, and mainly aims at the control optimization when the condensate water pump is abnormal or the booster pump is abnormal, the condensate water main pipe pressure is greatly fluctuated or the seal water pressure of the water supply pump is greatly fluctuated, adopts the adjusting method of 'override quick response and subsequent tracking control value', can solve the contradiction between the high pressure head operation requirement of the condensate water miscellaneous users and the variable-frequency low-speed operation energy saving of the condensate water pump, and can always keep the seal water pressure of the water supply pump stable under the accident condition.
FIG. 3 shows the condensate pump control logic after the sealing water booster pump is added, and the control process is as follows:
(1) the rotating speed control of the condensate pump is adjusted by switching to a water level control mode according to the water level of the deaerator, the total water supply quantity and the three-impulse of the condensate flow, so that the stability of the water level of the deaerator is ensured. When the pressure of the condensate pump outlet main pipe is lower than 1.5MPa, the command of the locking frequency converter is reduced.
(2) And adjusting the opening according to the load to ensure that the pressure of the condensed water is not lower than the combined starting value of the backup pump.
(3) When the rotating speed of the small machine 4A or 4B is more than 3000rpm and any one of the following conditions is met, the pressure regulation is automatically switched to be performed: a. tripping both the pump feeding sealed water booster pumps; b. the two pump sealing water booster pumps do not operate for 10 seconds; c. the pressure of a main pipe of the sealed water booster pump is less than 2 MPa.
(4)2 sealing water booster pumps are all in an off state and have a load greater than 150MW, and when the condensate pump is in variable frequency operation, the following actions will occur: 1. automatically switching the frequency conversion mode of the condensate pump from the liquid level of the deaerator to the outlet pressure; 2. sending a 15-second pulse to set the variable frequency rotating speed instruction of the coagulation pump to 1450 rpm; 3. sending 5-second pulse to set the main liquid level regulating valve of the deaerator to 50 percent; 4. sending a 30-second pulse to set the instructions of the 4A/B air pump water inlet end sealing water inlet temperature regulating valve and the 4A/B air pump water outlet end sealing water inlet temperature regulating valve to 100 percent; the logic can improve the condensed water pressure in time under the accident condition to supply the sealing water through the bypass, and the stability of the return water temperature of the sealing water of the steam pump is ensured.
When the pump frequency conversion mode is automatically switched to the outlet pressure by the deaerator liquid level, the deaerator water level main regulating valve is switched to the deaerator liquid level automatic mode from the manual mode, the deaerator water level auxiliary regulating valve instruction is set to 0, and the deaerator liquid level set value is the liquid level set value of the original pump water level control mode.
Protection tripping logic of the steam pump sealing water booster pump: the booster pump A is interlockingly stopped when the pressure of the condensate pump outlet main pipe is more than 4.5MPa, the pressure of the steam pump seal water booster pump outlet main pipe is more than 4.5MPa and the temperature of the steam pump seal water is not high (lower than 60 ℃), and the booster pump B is interlockingly stopped after 5 seconds of delay; this logic is used to ensure that seal water pressure does not exceed limits.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (5)
1. The utility model provides a device of feed pump sealing water of power plant's condensate system, includes condensate pump, steam pump sealing water system, feed pump and condenser, its characterized in that: the steam pump sealing water system comprises sealing water booster pump A, sealing water booster pump B, bypass, filter screen, subsidiary pipeline and valve, and sealing water booster pump A, sealing water booster pump B and bypass are parallelly connected through pipeline and valve group, the one end and the condensate pump intercommunication of steam pump sealing water system, condensate pump and converter pass through wire electric connection, the one end that the steam pump sealing water system deviates from condensate pump communicates with feed pump A and feed pump B, feed pump A and feed pump B are parallelly connected through pipeline and valve group, feed pump A and feed pump B deviate from the one end and the condenser intercommunication of steam pump sealing water system.
2. The apparatus for supplying seal water to a feed pump of a power plant condensate system as claimed in claim 1, wherein: the seal water booster pump A and the seal water booster pump B are respectively provided with a recirculation pipeline for ensuring the lowest flow rate when the seal water booster pump A and the seal water booster pump B start or stop, and preventing the seal water booster pump A and the seal water booster pump B from cavitation.
3. The apparatus for supplying seal water to a feed pump of a power plant condensate system as claimed in claim 1, wherein: the sealing water booster pump A and the sealing water booster pump share one bypass system, when the sealing water booster pump A and the sealing water booster pump B are not started, the sealing water is supplied to the water pump by condensed water, the bypass system is provided with a check valve, and after the booster pumps are started, the check valve is closed; when the operating booster pump is tripped and the standby booster pump cannot be started in an interlocking manner, the check valve is opened, and the condensed water is supplied to the water supply pump to seal water, so that the sealing water is ensured not to be interrupted.
4. The apparatus for supplying seal water to a feed pump of a power plant condensate system as claimed in claim 1, wherein: and a sealing water regulating valve is arranged between the steam pump sealing water system and the water feeding pump A and between the steam pump sealing water system and the water feeding pump B, the sealing water regulating valve regulates the amount of sealing water entering the water feeding pump, the cooling of the sealing ring is ensured, and the return water of the sealing water is finally recovered to the condenser.
5. The device for supplying sealing water to the water feeding pump of the power plant condensation water system as claimed in claim 1, wherein the operating pressure of the condensation water system is 1.5MPa-3.8MPa, the sealing water pressure of the water feeding pump A and the water feeding pump B is 1.5MPa-3.8MPa, the inlet pressure of the sealing water booster pump A and the sealing water booster pump B is 0.9MPa-3.5MPa, the lift of the sealing water booster pump A and the sealing water booster pump B is 170m, and the sealing water flow rate of the water feeding pump A and the water feeding pump B is 17L/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921233047.7U CN210977837U (en) | 2019-08-01 | 2019-08-01 | Device for supplying sealing water to water feeding pump of power plant condensate system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921233047.7U CN210977837U (en) | 2019-08-01 | 2019-08-01 | Device for supplying sealing water to water feeding pump of power plant condensate system |
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| CN210977837U true CN210977837U (en) | 2020-07-10 |
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| CN201921233047.7U Active CN210977837U (en) | 2019-08-01 | 2019-08-01 | Device for supplying sealing water to water feeding pump of power plant condensate system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112443761A (en) * | 2020-11-24 | 2021-03-05 | 华能汕头海门发电有限责任公司 | System and method for improving sealing water supply performance of water supply pump set of thermal power plant |
| CN113031681A (en) * | 2021-03-03 | 2021-06-25 | 江苏南通发电有限公司 | Condensation depth frequency conversion optimization method for thermal generator set |
| CN114352942A (en) * | 2021-12-09 | 2022-04-15 | 华电国际电力股份有限公司天津开发区分公司 | Water pump mechanical sealing system capable of automatically switching sealing water source and adjusting pressure |
-
2019
- 2019-08-01 CN CN201921233047.7U patent/CN210977837U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112443761A (en) * | 2020-11-24 | 2021-03-05 | 华能汕头海门发电有限责任公司 | System and method for improving sealing water supply performance of water supply pump set of thermal power plant |
| CN113031681A (en) * | 2021-03-03 | 2021-06-25 | 江苏南通发电有限公司 | Condensation depth frequency conversion optimization method for thermal generator set |
| CN113031681B (en) * | 2021-03-03 | 2022-04-15 | 江苏南通发电有限公司 | Condensation depth frequency conversion optimization method for thermal generator set |
| CN114352942A (en) * | 2021-12-09 | 2022-04-15 | 华电国际电力股份有限公司天津开发区分公司 | Water pump mechanical sealing system capable of automatically switching sealing water source and adjusting pressure |
| CN114352942B (en) * | 2021-12-09 | 2023-07-25 | 华电国际电力股份有限公司天津开发区分公司 | Water pump mechanical sealing system capable of automatically switching sealing water source and adjusting pressure |
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