CN110195961B - Water level linkage control system in air cooling photo-thermal unit and linkage control method thereof - Google Patents

Water level linkage control system in air cooling photo-thermal unit and linkage control method thereof Download PDF

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Publication number
CN110195961B
CN110195961B CN201910570424.4A CN201910570424A CN110195961B CN 110195961 B CN110195961 B CN 110195961B CN 201910570424 A CN201910570424 A CN 201910570424A CN 110195961 B CN110195961 B CN 110195961B
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water
cooling
storage tank
cooling fan
liquid level
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CN110195961A (en
Inventor
高霞娥
高志广
付文刚
张爱军
李�诚
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Northwest Electric Power Design Institute of China Power Engineering Consulting Group
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Northwest Electric Power Design Institute of China Power Engineering Consulting Group
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25DREFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D17/00Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/02Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating liquids, e.g. brine
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25DREFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D29/00Arrangement or mounting of control or safety devices
    • F25D29/001Arrangement or mounting of control or safety devices for cryogenic fluid systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25DREFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2600/00Control issues
    • F25D2600/06Controlling according to a predetermined profile
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/40Solar thermal energy, e.g. solar towers

Abstract

The invention discloses a water level linkage control system and a linkage control method thereof in an air cooling photo-thermal unit, and belongs to the field of solar energy development and utilization. According to the interlocking control method of the water level interlocking control system in the air cooling photo-thermal unit, when the control system operates normally, circulating water in auxiliary equipment enters a branch where a cooling fan section is located through an auxiliary cooling water pipe, enters a corresponding cooling fan section through a valve on the branch, is cooled in the cooling fan section, and enters auxiliary equipment again through an auxiliary return water pipe; when the water temperature is lower than the preset temperature, cooling water in the auxiliary machine dry cooling tower flows back to the water storage tank from the first inlet through the outlet of the corresponding cooling fan section; circulating water in the auxiliary machine cooling water pipe enters the water storage tank from the second inlet. The linkage control method greatly reduces the hidden danger of system freeze protection caused by frequent start and stop of the optothermal unit, and improves the safety of equipment operation.

Description

Water level linkage control system in air cooling photo-thermal unit and linkage control method thereof
Technical Field
The invention belongs to the field of solar energy development and utilization, and particularly relates to a water level linkage control system in an air cooling photo-thermal unit and a linkage control method thereof.
Background
Solar energy is a clean renewable energy source, is inexhaustible, and has been vigorously developed in recent years. The solar energy direct radiation resources and the available land resources in China are intensively distributed in the northwest area of China, and the northwest area is extremely cold in winter, so that the antifreezing situation is particularly severe. The conventional auxiliary machine system of the thermal power generating unit only depends on an electric tracing method, so that the problem is that when the auxiliary machine system is started under a severe cold working condition in winter, a radiator fin tube at the tail end of water flow is frozen and a pipeline is blocked due to limited water flow speed in the process of filling cooling medium into each cooling fan section. Meanwhile, the frequent start and stop of the light-heat machine set can bring the requirement of frequent water filling and draining of the water storage tank, and if the water level is controlled to be higher than the highest liquid level, the water tank overflows and drains, so that water resources are wasted; meanwhile, especially in the severe cold working condition in winter, water in each sector of the dry cooling tower cannot enter the water storage tank, namely, the radiator also has the risk of frost cracking, and the overhaul and maintenance period and the cost of equipment are increased.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a water level linkage control system and a linkage control method thereof in an air cooling photo-thermal unit.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
the water level linkage control system in the air cooling photo-thermal unit comprises an auxiliary machine cooling water pipe, an auxiliary machine water return pipe, an auxiliary machine dry cooling tower, a water storage tank, a water conveying pump, a water supplementing pump and a plurality of valves, wherein the auxiliary machine dry cooling tower comprises a plurality of cooling fan sections, and the valves are arranged on branches of inlets and outlets of the cooling fan sections;
the water storage tank is provided with a liquid level transmitter and a circulating water inlet, a first outlet of the water storage tank is communicated with the inlets of all the cooling fan sections, and a water delivery pump is arranged between the first outlet and the inlet; the outlets of the cooling fan sections are communicated with the first inlet of the water storage tank;
the second outlet of the water storage tank is communicated with an auxiliary machine water return pipe, and a water supplementing pump is arranged between the second outlet and the auxiliary machine water return pipe;
the cooling water pipe of the auxiliary machine is communicated with the inlet of the cooling fan section, and the outlet of the cooling fan section is communicated with the water return pipe of the auxiliary machine;
the auxiliary machine cooling water pipe is communicated with a second inlet of the water storage tank;
valves are arranged on the communicating pipes;
an antifreezing solution is added into the circulating water in the control system.
Further, the circulating water comprises desalted water and antifreeze solution in a volume ratio of 1:1.
Further, the method comprises the following operations:
when the water is filled, circulating water in the water storage tank enters the branch where the inlet of each cooling fan section is positioned through the first outlet and the water delivery pump, and enters the corresponding cooling fan section through the valve; circulating water in the water storage tank enters an auxiliary machine water return pipe from a second outlet through a water supplementing pump;
when the control system normally operates, circulating water in auxiliary equipment enters a branch circuit where the cooling fan section is located through an auxiliary cooling water pipe, enters a corresponding cooling fan section through a valve on the branch circuit, is cooled in the cooling fan section, and enters the auxiliary equipment again through an auxiliary water return pipe;
when the water temperature is lower than the preset temperature, cooling water in the auxiliary machine dry cooling tower flows back to the water storage tank from the first inlet through the outlet of the corresponding cooling fan section;
circulating water in the auxiliary machine cooling water pipe enters the water storage tank from the second inlet.
Further, the method also comprises the following operations:
when the liquid level displayed by the liquid level transmitter is higher than the highest liquid level, the liquid in the water storage tank is lifted and discharged by the water delivery pump until the liquid level in the water storage tank is lower than the highest liquid level.
Further, the method also comprises the following operations:
when the liquid level displayed by the liquid level transmitter is lower than the lowest liquid level, circulating water enters the water storage tank through the circulating water inlet until the liquid level in the circulating water is higher than the lowest liquid level.
Compared with the prior art, the invention has the following beneficial effects:
according to the water level linkage control system in the air cooling photo-thermal unit, the water level linkage is arranged in the water storage tank, so that the requirements of running the fan section for draining water and not running the water filling of the fan section at any time can be met; the system can realize the cooling of auxiliary equipment circulating water and the draining of supercooled water, and the circulating water contains antifreeze solution, and the two modes act together to prevent the freezing of the air cooling photo-thermal unit.
According to the interlocking control method of the water level interlocking control system in the air cooling photo-thermal unit, water filling, normal operation and water draining of the water level interlocking control system in the air cooling photo-thermal unit are realized through interlocking control of different states, and the interlocking control method greatly reduces the hidden danger of system freezing prevention caused by frequent start and stop of the photo-thermal unit and improves the safety of equipment operation. Furthermore, the linkage control method can monitor the liquid level of the water storage tank to enable the liquid level to be in a normal liquid level range.
Drawings
FIG. 1 is a diagram of a water level linkage control system in an air cooling photo-thermal unit of the invention.
Wherein: 1-an auxiliary machine cooling water pipe; 2-an auxiliary machine return pipe; 3-an auxiliary machine dry cooling tower; 4-a circulating water inlet; 5-a water storage tank; 6-a liquid level transmitter; 7-a drain pipe; 8-a water charging pipeline; 9-a water supplementing pump; 10-a water conveying pump; 11-a water supplementing pipeline; 12-cooling sector.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the attached drawing figures:
referring to fig. 1, fig. 1 is a diagram of a water level linkage control system in an air cooling photo-thermal unit according to the present invention; the water level linkage control system in the air cooling photo-thermal unit comprises an auxiliary machine cooling water pipe 1, an auxiliary machine water return pipe 2, an auxiliary machine dry cooling tower 3, a circulating water inlet 4, a water storage tank 5, a liquid level transmitter 6, a water drain pipe 7, a water filling pipeline 8, a water supplementing pump 9, a water delivery pump 10, a water supplementing pipeline 11 and a cooling fan section 12, wherein the cooling fan section 12 in the figure comprises a first cooling fan section, a second cooling fan section, a third cooling fan section and a fourth cooling fan section;
the water storage tank is provided with a liquid level transmitter and a circulating water inlet, a first outlet of the water storage tank is communicated with the inlets of all the cooling fan sections through a water filling pipeline 8, and a water conveying pump is arranged on the water filling pipeline 8; the outlets of the cooling fan sections are communicated with the first inlet of the water storage tank through a drain pipe 7; the second outlet of the water storage tank is communicated with an auxiliary machine water return pipe through a water supplementing pipeline 11, and a water supplementing pump is arranged on the water supplementing pipeline 11; the cooling water pipe of the auxiliary machine is communicated with the inlet of the cooling fan section, and the outlet of the cooling fan section is communicated with the water return pipe of the auxiliary machine; the auxiliary machine cooling water pipe is communicated with a second inlet of the water storage tank; valves are arranged on the communicating pipes; an antifreezing solution is added into circulating water in the control system;
when the water is filled, circulating water in the water storage tank enters the branch where the inlet of each cooling fan section is positioned through the first outlet and the water delivery pump, and enters the corresponding cooling fan section through the valve; circulating water in the water storage tank enters an auxiliary machine water return pipe from a second outlet through a water supplementing pump;
when the control system normally operates, circulating water in auxiliary equipment enters a branch circuit where the cooling fan section is located through an auxiliary cooling water pipe, enters a corresponding cooling fan section through a valve on the branch circuit, is cooled in the cooling fan section, and enters the auxiliary equipment again through an auxiliary water return pipe;
when the water temperature is lower than the preset temperature, cooling water in the auxiliary machine dry cooling tower flows back to the water storage tank from the first inlet through the outlet of the corresponding cooling fan section;
circulating water in the auxiliary machine cooling water pipe enters the water storage tank from the second inlet;
when the liquid level displayed by the liquid level transmitter is higher than the highest liquid level, lifting and discharging the liquid in the water storage tank through the water delivery pump until the liquid level in the water storage tank is lower than the highest liquid level;
when the liquid level displayed by the liquid level transmitter is lower than the lowest liquid level, circulating water enters the water storage tank through the circulating water inlet until the liquid level in the circulating water is higher than the lowest liquid level.
According to the invention, whether the cooling fan sections are in the operation working condition is judged by the opening states and the number of the cooling fan section valves, the operation number of the cooling fan sections is calculated and the lowest liquid level and the highest liquid level of the water storage tank 5 under the operation working condition of the corresponding cooling fan sections are determined, and the water supplementing or draining valve of the water storage tank 5 is opened in a chained manner, so that the auxiliary machine system can realize flexible opening of each cooling fan section and meet the emergency water draining requirement of each operation cooling fan section under the severe cold working condition in winter. In the severe cold working condition, for example, the ambient temperature is less than or equal to minus 20 ℃, when the auxiliary machine dry cooling tower is provided with a plurality of cooling sectors, referring to fig. 1, the invention takes 4 cooling sectors as an example, and the lowest and highest liquid level and the interlocking control method of the water storage tank are as follows:
when 0 cooling fan sections are operated, the lowest liquid level L min0 =4 cooling sector volumes corresponding to liquid level+pump-on minimum liquid level of the water pump; when 0 cooling fan sections are operated, the highest liquid level L max0 Total volume of water storage tank V Total (S) -a liquid level corresponding to a volume of 0 cooling sectors;
when 1 cooling fan is operated, the lowest liquid level L min1 =3 cooling sector volumes corresponding to liquid level+pump-on minimum liquid level of the water pump; when 1 cooling fan is operated, the highest liquid level L max1 Total volume of water storage tank V Total (S) -1 liquid level corresponding to the volume of the cooling sectors;
when 2 cooling sectors are operated, the minimum level L min2 =2 cooling sector volumes corresponding to liquid level+pump-on minimum liquid level of the water pump; when 2 cooling sectors are operated, the highest level L max2 Total volume of water storage tank V Total (S) -2 liquid levels corresponding to cooling sector volumes;
when the 3 cooling sectors are operated, the minimum level L min3 =1 cooling sector volume corresponding to liquid level+pump-on minimum liquid level of water pump; maximum level L when 3 cooling sectors are operating max3 Total volume of water storage tank V Total (S) -3 liquid levels corresponding to cooling sector volumes;
when 4 cooling sectors are operated, the minimum level L min4 =0 cooling sector volumes corresponding to liquid level+pump-on minimum liquid level of the water pump; when the 4 cooling sectors are operated, the highest liquid level L max4 Total volume of water storage tank V Total (S) -liquid level corresponding to 4 cooling sector volumes
When the unit normally operates, if the liquid level of the water storage tank 5 is lower than the lowest liquid level of the corresponding cooling fan section, the low water level alarms and automatically opens a valve for supplementing water of circulating water, and water is automatically supplemented to the water storage tank 5; when the liquid level of the water storage tank 5 is higher than the highest liquid level of the corresponding opened cooling fan section, the high water level alarms, the water supplementing valve of the water storage tank is closed, and redundant liquid in the water storage tank 5 is pumped out through the water conveying pump 10, so that the liquid level of the water storage tank 5 is ensured to be between the highest liquid level and the lowest liquid level of the corresponding opened cooling fan section.
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 (4)

1. The interlocking control method of the water level interlocking control system in the air cooling photo-thermal unit is characterized in that the system comprises an auxiliary machine cooling water pipe (1), an auxiliary machine water return pipe (2), an auxiliary machine dry cooling tower (3), a water storage tank (5), a water delivery pump (10), a water supplementing pump (9) and a plurality of valves, wherein the auxiliary machine dry cooling tower (3) comprises a plurality of cooling fan sections, and the valves are arranged on branches of inlets and outlets of the cooling fan sections;
a liquid level transmitter (6) and a circulating water inlet (4) are arranged on the water storage tank (5), a first outlet of the water storage tank (5) is communicated with each cooling sector inlet, and a water conveying pump (10) is arranged between the first outlet and the second outlet; the outlets of the cooling fan sections are communicated with a first inlet of a water storage tank (5);
the second outlet of the water storage tank (5) is communicated with an auxiliary machine water return pipe (2), and a water supplementing pump (9) is arranged between the second outlet and the auxiliary machine water return pipe;
the auxiliary machine cooling water pipe (1) is communicated with the inlet of the cooling fan section, and the outlet of the cooling fan section is communicated with the auxiliary machine water return pipe (2);
the auxiliary machine cooling water pipe (1) is communicated with a second inlet of the water storage tank (5);
valves are arranged on the communicated pipelines;
an antifreezing solution is added into circulating water in the control system;
the linkage control method comprises the following operations:
when the water is filled, circulating water in the water storage tank (5) enters a branch where the inlet of each cooling fan section is positioned through a first outlet and a water delivery pump (10), and enters the corresponding cooling fan section (12) through a valve; circulating water in the water storage tank (5) enters the auxiliary machine water return pipe (2) from a second outlet through the water supplementing pump (9);
when the control system normally operates, circulating water in auxiliary equipment enters a branch where the cooling fan section (12) is located through the auxiliary cooling water pipe (1), enters the corresponding cooling fan section (12) through a valve on the branch, is cooled in the cooling fan section (12), and enters the auxiliary equipment again through the auxiliary return water pipe (2);
when the water temperature is lower than the preset temperature, cooling water in the auxiliary machine dry cooling tower (3) flows back to the water storage tank (5) from the first inlet through the outlet of the corresponding cooling fan section (12);
circulating water in the auxiliary machine cooling water pipe (1) enters the water storage tank (5) from the second inlet;
judging whether the cooling fan sections are in the operation working condition or not through the opening states and the quantity of the cooling fan section valves, calculating and determining the lowest liquid level and the highest liquid level of the water storage tank (5) under the operation working condition of the corresponding cooling fan sections, and opening the water supplementing or draining valves of the water storage tank (5) in a linkage mode so as to ensure that the auxiliary machine system can realize flexible opening of each cooling fan section and meet the emergency water draining requirement of each operation cooling fan section under the severe cold working condition in winter.
2. The interlocking control method of the water level interlocking control system in the air cooling photo-thermal unit according to claim 1, wherein the circulating water comprises desalted water and antifreeze solution in a volume ratio of 1:1.
3. The interlock control method of a water level interlock control system in an air-cooled photo-thermal unit according to claim 1, further comprising the operations of:
when the liquid level displayed by the liquid level transmitter (6) is higher than the highest liquid level, the liquid in the water storage tank (5) is lifted and discharged through the water conveying pump (10) until the liquid level in the water storage tank (5) is lower than the highest liquid level.
4. The interlock control method of a water level interlock control system in an air-cooled photo-thermal unit according to claim 1, further comprising the operations of:
when the liquid level displayed by the liquid level transmitter (6) is lower than the lowest liquid level, circulating water enters the water storage tank (5) through the circulating water inlet (4) until the liquid level in the circulating water is higher than the lowest liquid level.
CN201910570424.4A 2019-06-27 2019-06-27 Water level linkage control system in air cooling photo-thermal unit and linkage control method thereof Active CN110195961B (en)

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CN205262031U (en) * 2015-12-05 2016-05-25 内蒙古电力勘测设计院有限责任公司 high back pressure heat supply unit auxiliary engine recirculating cooling water system
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CN207262801U (en) * 2017-09-28 2018-04-20 公安部天津消防研究所 A kind of compound cooling water system
CN208186957U (en) * 2018-02-26 2018-12-04 李涛 A kind of hydraulic dynamometer water tank automatic cycle control reverse flow cooling system
CN210107861U (en) * 2019-06-27 2020-02-21 中国电力工程顾问集团西北电力设计院有限公司 Water level interlocking control system in air cooling light and heat unit

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06180176A (en) * 1992-10-23 1994-06-28 Hitachi Ltd Cold water circulating device
CN101025343A (en) * 2006-02-21 2007-08-29 许建壮 Generating plant circulation-water electrothermal combined production and air-cooling spraying combined cooling system
JP2017053597A (en) * 2015-09-11 2017-03-16 三菱重工業株式会社 Cooling tower control device, cooling tower control method and heat source system
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