CN110686526A - Energy-saving method for cooling water system of coal-fired unit - Google Patents

Energy-saving method for cooling water system of coal-fired unit Download PDF

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Publication number
CN110686526A
CN110686526A CN201910173819.0A CN201910173819A CN110686526A CN 110686526 A CN110686526 A CN 110686526A CN 201910173819 A CN201910173819 A CN 201910173819A CN 110686526 A CN110686526 A CN 110686526A
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China
Prior art keywords
closed
cooling water
water system
water
open
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CN201910173819.0A
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Chinese (zh)
Inventor
叶茂
张学锁
朱勇军
姚兴令
吴立兵
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Anhui Wanneng Electric Power Operation And Maintenance Co Ltd
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Anhui Wanneng Electric Power Operation And Maintenance Co Ltd
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Priority to CN201910173819.0A priority Critical patent/CN110686526A/en
Publication of CN110686526A publication Critical patent/CN110686526A/en
Pending legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28BSTEAM OR VAPOUR CONDENSERS
    • F28B9/00Auxiliary systems, arrangements, or devices
    • F28B9/04Auxiliary systems, arrangements, or devices for feeding, collecting, and storing cooling water or other cooling liquid
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28BSTEAM OR VAPOUR CONDENSERS
    • F28B9/00Auxiliary systems, arrangements, or devices
    • F28B9/08Auxiliary systems, arrangements, or devices for collecting and removing condensate

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)

Abstract

The invention provides an energy-saving method for a cooling water system of a coal-fired unit, which comprises an open cooling water system and a closed circulating cooling water system, wherein a pipeline is connected between the open cooling water system and the closed circulating cooling water system. One end of the pipeline is connected to one side of the outlet of the closed circulating cooling water closed pump, and the other end of the pipeline is connected to one side of the outlet of the starting water pump of the open cooling water system. The closed circulating cooling water system also comprises a closed water tank, a closed pump, a closed water heat exchanger, a closed water user and a closed pump which are sequentially connected. And a dosing tank is also arranged on the inlet pipeline of the closed circulating cooling water pump. According to the invention, according to the condition that the open water and the circulating water are the same water source and the pressure of the condenser inlet of the circulating water system is equivalent to the pressure of the outlet of the open water pump, the user cooled by the open water is changed into the direct cooling of the circulating water. After the change, the open water pump is not powered, the power consumption is reduced, the equipment maintenance cost is reduced, and the operation cost is saved.

Description

Energy-saving method for cooling water system of coal-fired unit
Technical Field
The invention belongs to the technical field of coal burners, and particularly relates to an energy-saving method for a cooling water system of a coal-fired unit.
Background
The open type circulating cooling water system of the coal-fired unit comprises an electric rotary filter screen, an open type cooling water pump, a closed type circulating cooling water heat exchanger, a steam side vacuum pump heat exchanger, a connecting pipeline, a valve and the like. The water supply pipe is taken from a circulating water inlet main pipe of a condenser outside the plant, and the return water of the cooling water is connected to a circulating water outlet main pipe of the condenser. The devices in the system are configured according to 100% capacity and connected in parallel, and one device runs and is standby. The water flow in the open cooling water system cools the cooling water in the closed circulating cooling water system through the closed circulating cooling water heat exchanger. Operating in the above manner will increase the amount of equipment maintenance while increasing plant power consumption.
Disclosure of Invention
The invention aims to solve the technical problem of providing an energy-saving method for a cooling water system of a coal-fired unit.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
an energy-saving method for a cooling water system of a coal-fired unit comprises an open cooling water system and a closed circulating cooling water system, wherein a pipeline is connected between the open cooling water system and the closed circulating cooling water system. One end of the pipeline is connected to one side of the outlet of the closed circulating cooling water closed pump, and the other end of the pipeline is connected to one side of the outlet of the starting water pump of the open cooling water system.
The closed circulating cooling water system also comprises a closed water tank, a closed pump, a closed water heat exchanger, a closed water user and a closed pump which are sequentially connected.
And a dosing tank is also arranged on the inlet pipeline of the closed circulating cooling water pump.
The invention has the beneficial effects that: according to the invention, according to the condition that the open water and the circulating water are the same water source and the pressure of the condenser inlet of the circulating water system is equivalent to the pressure of the outlet of the open water pump, the user cooled by the open water is changed into the direct cooling of the circulating water. After the change, the open water pump is not powered, the power consumption is reduced, the equipment maintenance cost is reduced, and the operation cost is saved.
Detailed Description
The present invention will be further described with reference to the following examples.
An energy-saving method for a cooling water system of a coal-fired unit comprises an open cooling water system and a closed circulating cooling water system, wherein a pipeline is connected between the open cooling water system and the closed circulating cooling water system. One end of the pipeline is connected to one side of the outlet of the closed circulating cooling water closed pump, and the other end of the pipeline is connected to one side of the outlet of the starting water pump of the open cooling water system.
The closed circulating cooling water system also comprises a closed water tank, a closed pump, a closed water heat exchanger, a closed water user and a closed pump which are sequentially connected.
And a dosing tank is also arranged on the inlet pipeline of the closed circulating cooling water pump.
The following are detailed experimental data for technical adaptation:
1. and in the running process of the unit, the open water pumps are completely stopped, the two open water pump outlet doors are opened, and the change of each relevant parameter of the open water system is observed for verification. In order to ensure the safety of the operation of the unit, the test starting time is selected under the condition that the load of the unit is low (350MW), if the parameters are not abnormal, the load is slowly increased to the rated value.
2. And if any parameter is abnormal in the test process, the open type water pump is started to run and stop the test immediately, and the test is carried out after the reason is analyzed and further improved.
3. And recording relevant parameters of the open water system at every 100MW load in the test process.
4. And fully mating the participating testers before the test, and coordinating the specialties for cooperation.
Test results are examined in the following table
Figure BDA0001988891480000031
Figure BDA0001988891480000041
Benefit analysis
1. Economic benefits are researched and tested through continuous efforts, and the open water system can be found from the table above that all relevant system parameters of the open water system are normal and stable under the condition that the open water pump is not started, so that the open-type-free water pump can run, and the equipment maintenance amount caused by the long-term running loss of equipment is reduced.
2. Calculating the annual consumed service power of the open water pump (current, voltage, power factor, 24h, 365/1000); 287A 380V 0.85 24h 365d/1000 812060 KWH.
Therefore, the circulating water is used for replacing the open water cooling operation mode, the plant power consumption can be saved by 812060KWH every year, considerable economic benefit is achieved, and the approval of owners is obtained
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to explain the principles of the invention, and that various modifications and alterations can be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims (4)

1. The energy-saving method for the cooling water system of the coal-fired unit comprises an open cooling water system and a closed circulating cooling water system, and is characterized in that: a pipeline is connected between the open type cooling water system and the closed type circulating cooling water system.
2. The energy-saving method for the cooling water system of the coal-fired unit according to claim 1, characterized in that: one end of the pipeline is connected to one side of the outlet of the closed circulating cooling water closed pump, and the other end of the pipeline is connected to one side of the outlet of the starting water pump of the open cooling water system.
3. The energy-saving method for the cooling water system of the coal-fired unit according to claim 1, characterized in that: the closed circulating cooling water system also comprises a closed water tank, a closed pump, a closed water heat exchanger, a closed water user and a closed pump which are sequentially connected.
4. The energy-saving method for the cooling water system of the coal-fired unit according to claim 2, characterized in that: and a dosing tank is also arranged on the inlet pipeline of the closed circulating cooling water pump.
CN201910173819.0A 2019-03-08 2019-03-08 Energy-saving method for cooling water system of coal-fired unit Pending CN110686526A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910173819.0A CN110686526A (en) 2019-03-08 2019-03-08 Energy-saving method for cooling water system of coal-fired unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910173819.0A CN110686526A (en) 2019-03-08 2019-03-08 Energy-saving method for cooling water system of coal-fired unit

Publications (1)

Publication Number Publication Date
CN110686526A true CN110686526A (en) 2020-01-14

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CN201910173819.0A Pending CN110686526A (en) 2019-03-08 2019-03-08 Energy-saving method for cooling water system of coal-fired unit

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3932212A (en) * 1972-12-26 1976-01-13 Kraftwerke Union Aktiengesellschaft Apparatus and method for depressurizing, degassing and affording decay of the radioactivity of weakly radioactive condensates in nuclear power plants
FR2483587A1 (en) * 1980-05-30 1981-12-04 Hudson Italiana Spa Secondary water cooling system for power station - passes secondary cooling water through two forced draught cooling towers with humidified and normal ambient air respectively
CN202102727U (en) * 2011-06-08 2012-01-04 中广核工程有限公司 Closed type cooling water system for nuclear power plant
CN203607105U (en) * 2013-12-17 2014-05-21 中广核工程有限公司 Closed cooling water system for nuclear power plant
CN104478137A (en) * 2014-12-18 2015-04-01 中国第一重型机械股份公司 Energy-saving recycling combination system for industrial circulating cooling water

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3932212A (en) * 1972-12-26 1976-01-13 Kraftwerke Union Aktiengesellschaft Apparatus and method for depressurizing, degassing and affording decay of the radioactivity of weakly radioactive condensates in nuclear power plants
FR2483587A1 (en) * 1980-05-30 1981-12-04 Hudson Italiana Spa Secondary water cooling system for power station - passes secondary cooling water through two forced draught cooling towers with humidified and normal ambient air respectively
CN202102727U (en) * 2011-06-08 2012-01-04 中广核工程有限公司 Closed type cooling water system for nuclear power plant
CN203607105U (en) * 2013-12-17 2014-05-21 中广核工程有限公司 Closed cooling water system for nuclear power plant
CN104478137A (en) * 2014-12-18 2015-04-01 中国第一重型机械股份公司 Energy-saving recycling combination system for industrial circulating cooling water

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
雷铭: "《发电节能手册》", 30 November 2005, 中国电力出版社 *

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