CN108180465B - Front-mounted pump control system of water feed pump - Google Patents
Front-mounted pump control system of water feed pump Download PDFInfo
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- CN108180465B CN108180465B CN201810138610.6A CN201810138610A CN108180465B CN 108180465 B CN108180465 B CN 108180465B CN 201810138610 A CN201810138610 A CN 201810138610A CN 108180465 B CN108180465 B CN 108180465B
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- pump
- valve
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- outlet
- supply pump
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 230000001105 regulatory effect Effects 0.000 claims abstract description 7
- 238000002955 isolation Methods 0.000 claims description 18
- 230000001276 controlling effect Effects 0.000 claims 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
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- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a water supply pump pre-pump control system, which comprises a deaerator, wherein an outlet of the deaerator is sequentially connected with a pre-pump, a water supply flowmeter and a main water supply pump, the outlet of the main water supply pump is divided into two paths, one path of water supply pump flows back to an inlet of the deaerator through a water supply pump recirculation valve, and the other path of water supply pump flows out through an outlet valve; an inlet valve is arranged between the pre-pump and the deaerator, and a regulating bypass used for preventing a recirculation valve of the main feed water pump from being opened in advance to reduce the running economy of the unit is connected in parallel between the pre-pump and the inlet valve. According to the invention, the recirculation pipeline, the valve and the measuring point are additionally arranged on the front pump outlet of the water supply pump unit, and when the coal-fired unit is in deep peak-shaving operation, the recirculation valve of the front pump is moderately opened, so that the operation safety of the front pump is ensured, and the recirculation valve of the main water supply pump is prevented from being opened in advance, so that the operation economy of the unit is reduced. The invention can solve the problem of matching of the operation characteristics of the front-end pump which operates at a constant speed and the main water supply pump which operates at a variable speed when the coal-fired unit deeply peak-shaving operation, and improves the operation safety and economy of the water supply pump set.
Description
Technical Field
The invention belongs to the field of coal-fired power generation, and relates to a water supply pump pre-pump control system.
Background
The existing coal-fired power generator set is generally provided with a water supply pump set to send the water supply in the deaerator water tank to the inlet of the boiler economizer, and simultaneously provide high-side desuperheating water, primary and secondary desuperheating water of the superheater, desuperheating water of the reheater and the like. The water supply pump set is generally provided with a main water supply pump and a front-end pump, the front-end pump operates at a constant speed, and the main water supply pump operates at a variable speed to regulate the water supply flow. With the improvement of the peak regulation depth of the unit, the water supply flow rate is greatly changed, the matching degree of the operation characteristics of the front-end pump operated at a constant speed and the main water supply pump operated at a variable speed is poor, and the abnormal phenomena of shaft channeling, increased tile vibration, higher tile temperature and the like of certain front-end pumps occur, so that the water supply pump outlet recirculation valve is opened, the flow rate of the pump set is increased to relieve, the power consumption or the steam consumption of the water supply pump set is increased, and the overall operation economy of the unit is reduced.
Disclosure of Invention
The invention aims to solve the problem of matching of the operation characteristics of a front-end pump operated at a constant speed and a main water supply pump operated at a variable speed when a coal-fired unit is operated in deep peak-shaving, and provides a water supply pump front-end pump control system which can improve the operation safety and economy of a water supply pump set.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
The utility model provides a feed pump pre-pump control system, includes the deaerator, and the export of deaerator connects gradually pre-pump, feed water flowmeter and main feed water pump, and the export of main feed water pump divide into two ways, and one of them flows back to the entry of deaerator through the feed water pump recirculation valve, and another route flows by the outlet valve outflow; an inlet valve is arranged between the pre-pump and the deaerator, and a regulating bypass used for preventing a recirculation valve of the main feed water pump from being opened in advance to reduce the running economy of the unit is connected in parallel between the pre-pump and the inlet valve.
The invention further improves that:
The regulating bypass comprises a pre-pump recirculation flowmeter and a pre-pump recirculation valve which are sequentially connected, wherein an inlet of the pre-pump recirculation flowmeter is communicated with an outlet of the pre-pump, and an outlet of the pre-pump recirculation valve is communicated with an inlet of the inlet valve.
A first front isolation valve is arranged between the pre-pump recirculation flowmeter and the pre-pump recirculation valve, and a first rear isolation valve is arranged at the outlet of the pre-pump recirculation valve.
The inlet of the water feed pump recirculation valve is provided with a second front isolation valve, and the outlet is provided with a second rear isolation valve.
Compared with the prior art, the invention has the following beneficial effects:
According to the invention, the recirculation pipeline, the valve and the measuring point are additionally arranged on the front pump outlet of the water supply pump unit, and when the coal-fired unit is in deep peak-shaving operation, the recirculation valve of the front pump is moderately opened, so that the operation safety of the front pump is ensured, and the recirculation valve of the main water supply pump is prevented from being opened in advance, so that the operation economy of the unit is reduced. The invention can solve the problem of matching of the operation characteristics of the front-end pump which operates at a constant speed and the main water supply pump which operates at a variable speed when the coal-fired unit deeply peak-shaving operation, and improves the operation safety and economy of the water supply pump set.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the present invention.
Wherein: 1-a deaerator; 2-inlet valve; 3-a pre-pump; 4-a feedwater flowmeter; 5-a main feed pump; 6-outlet valve; 7-a pre-pump recirculation flow meter; 8-a first front isolation valve; 9-a pre-pump recirculation valve; 10-a first post isolation valve; 11-a second front isolation valve; 12-a feed pump recirculation valve; 13-a second post isolation valve.
Detailed Description
The invention is described in further detail below with reference to the attached drawing figures:
Referring to fig. 1, the water supply pump pre-pump control system comprises a deaerator 1, wherein an outlet of the deaerator 1 is sequentially connected with a pre-pump 3, a water supply flowmeter 4 and a main water supply pump 5, the outlet of the main water supply pump 5 is divided into two paths, one path flows back to an inlet of the deaerator 1 through a water supply pump recirculation valve 12, and the other path flows out through an outlet valve 6; an inlet valve 2 is arranged between the pre-pump 3 and the deaerator 1, and a regulating bypass for preventing a main feed water pump recirculation valve from being opened in advance to reduce the running economy of the unit is connected in parallel between the pre-pump 3 and the inlet valve 2. The regulating bypass comprises a pre-pump recirculation flow meter 7 and a pre-pump recirculation valve 9 which are connected in sequence, wherein the inlet of the pre-pump recirculation flow meter 7 is communicated with the outlet of the pre-pump 3, and the outlet of the pre-pump recirculation valve 9 is communicated with the inlet of the inlet valve 2. A first front isolation valve 8 is arranged between the pre-pump recirculation flow meter 7 and the pre-pump recirculation valve 9, and a first rear isolation valve 10 is arranged at the outlet of the pre-pump recirculation valve 9. The feed pump recirculation valve 12 is provided with a second front isolation valve 11 at the inlet and a second rear isolation valve 13 at the outlet.
The principle and the working process of the invention are as follows:
The invention is led out from a proper position of a pipeline between a pre-pump 3 and a water supply pump flowmeter 4, a pre-pump recirculation flow meter 7, a first front isolation valve of a pre-pump recirculation valve, a pre-pump recirculation valve 9, a first rear isolation valve 10 of the pre-pump recirculation valve and the like are arranged in sequence, and the pipeline is connected to a position, close to a deaerator 1, in front of an inlet valve 2 of the pre-pump or a standby port of the deaerator 1.
As the load of the unit is reduced, the measured value of the water feeding pump flowmeter 4 is gradually reduced, and according to the actual working condition of the front-end pump, the sum of the measured values of the water feeding pump flowmeter 4 and the front-end pump recirculation flowmeter 7 is taken as a control value, and the front-end pump recirculation valve 9 is reasonably opened; the unit load continues to decrease, and the water feed pump recirculation valve 12 is reasonably opened by taking the measured value of the water feed pump flowmeter 4 as a control value.
The above is only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited by this, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (1)
1. The utility model provides a feed pump pre-pump control system which is characterized in that, including deaerator (1), the export of deaerator (1) connects gradually pre-pump (3), feed water flowmeter (4) and main feed water pump (5), and the export of main feed water pump (5) divide into two-way, and one of them flows back to the entry of deaerator (1) through feed water pump recirculation valve (12), and another one flows out by outlet valve (6); an inlet valve (2) is arranged between the pre-pump (3) and the deaerator (1), and a regulating and controlling bypass for preventing a main feed water pump recirculation valve from being opened in advance to reduce the running economy of the unit is connected in parallel between the pre-pump (3) and the inlet valve (2);
The regulating bypass comprises a pre-pump recirculation flow meter (7) and a pre-pump recirculation valve (9) which are sequentially connected, wherein the inlet of the pre-pump recirculation flow meter (7) is communicated with the outlet of the pre-pump (3), and the outlet of the pre-pump recirculation valve (9) is communicated with the inlet of the inlet valve (2);
a first front isolation valve (8) is arranged between the front pump recirculation flow meter (7) and the front pump recirculation valve (9), and a first rear isolation valve (10) is arranged at the outlet of the front pump recirculation valve (9);
The inlet of the feed water pump recirculation valve (12) is provided with a second front isolation valve (11), and the outlet is provided with a second rear isolation valve (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810138610.6A CN108180465B (en) | 2018-02-10 | 2018-02-10 | Front-mounted pump control system of water feed pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810138610.6A CN108180465B (en) | 2018-02-10 | 2018-02-10 | Front-mounted pump control system of water feed pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108180465A CN108180465A (en) | 2018-06-19 |
| CN108180465B true CN108180465B (en) | 2024-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810138610.6A Active CN108180465B (en) | 2018-02-10 | 2018-02-10 | Front-mounted pump control system of water feed pump |
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| CN (1) | CN108180465B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110397909A (en) * | 2019-08-20 | 2019-11-01 | 华能国际电力股份有限公司 | Water supply feedforward control system and method based on feed pump recycle valve state |
| CN113431787B (en) * | 2021-07-30 | 2022-07-08 | 西安热工研究院有限公司 | System for preventing recirculation valve of feed pump from leaking under condition of adapting to frequent peak regulation situation |
| CN115523079A (en) * | 2022-10-19 | 2022-12-27 | 上海申信凯能源科技有限公司 | Self-adaptive adjustment system method for electric power depth peak regulation supply water flow |
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|---|---|---|---|---|
| JPH06147409A (en) * | 1992-10-30 | 1994-05-27 | Hitachi Ltd | Controlling device for recirculation valve for feed water pump |
| CN202182459U (en) * | 2011-06-29 | 2012-04-04 | 内蒙古大唐国际托克托发电有限责任公司 | Circulation line system for booster pump of turbine driven boiler feed water pump and deaerator water tank |
| CN203949155U (en) * | 2014-06-20 | 2014-11-19 | 河北省电力勘测设计研究院 | 1000MW ultra supercritical unit water supply system |
| CN104595885A (en) * | 2015-02-05 | 2015-05-06 | 广东电网有限责任公司电力科学研究院 | Control method of minimum-flow recirculation valve of water supply pump of power station boiler |
| CN204460172U (en) * | 2015-01-14 | 2015-07-08 | 陕西万方节能科技股份有限公司 | A kind of pulverized-coal fired boiler adjacent stove heating coil start up system |
| CN107355770A (en) * | 2017-06-26 | 2017-11-17 | 华电电力科学研究院 | Pass through method of the steam feed pump to boiler water filling during a kind of Unit Commitment |
| CN206786697U (en) * | 2017-05-15 | 2017-12-22 | 山东电力基本建设总公司 | Feedwater recirculating system |
| CN207990591U (en) * | 2018-02-10 | 2018-10-19 | 西安西热节能技术有限公司 | A kind of preposition pump control system of feed pump |
-
2018
- 2018-02-10 CN CN201810138610.6A patent/CN108180465B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06147409A (en) * | 1992-10-30 | 1994-05-27 | Hitachi Ltd | Controlling device for recirculation valve for feed water pump |
| CN202182459U (en) * | 2011-06-29 | 2012-04-04 | 内蒙古大唐国际托克托发电有限责任公司 | Circulation line system for booster pump of turbine driven boiler feed water pump and deaerator water tank |
| CN203949155U (en) * | 2014-06-20 | 2014-11-19 | 河北省电力勘测设计研究院 | 1000MW ultra supercritical unit water supply system |
| CN204460172U (en) * | 2015-01-14 | 2015-07-08 | 陕西万方节能科技股份有限公司 | A kind of pulverized-coal fired boiler adjacent stove heating coil start up system |
| CN104595885A (en) * | 2015-02-05 | 2015-05-06 | 广东电网有限责任公司电力科学研究院 | Control method of minimum-flow recirculation valve of water supply pump of power station boiler |
| CN206786697U (en) * | 2017-05-15 | 2017-12-22 | 山东电力基本建设总公司 | Feedwater recirculating system |
| CN107355770A (en) * | 2017-06-26 | 2017-11-17 | 华电电力科学研究院 | Pass through method of the steam feed pump to boiler water filling during a kind of Unit Commitment |
| CN207990591U (en) * | 2018-02-10 | 2018-10-19 | 西安西热节能技术有限公司 | A kind of preposition pump control system of feed pump |
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| CN108180465A (en) | 2018-06-19 |
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