CN-121994044-A - Energy-storage water-saving demisting device and method for coupling compressed air energy storage with wet cooling tower

CN121994044ACN 121994044 ACN121994044 ACN 121994044ACN-121994044-A

Abstract

The invention discloses an energy-storage water-saving demisting device and method for coupling compressed air energy storage and a wet cooling tower, comprising the wet cooling tower, a demisting heat exchanger, a compressed air energy storage system, a heat storage tank and a water-saving tank, wherein the demisting heat exchanger is arranged at the upper part of the wet cooling tower, the compressed air energy storage system comprises a compressor unit, an expansion unit, a high-pressure air storage tank, the heat storage tank and the cold storage tank, an outlet of the compressor unit is connected with an inlet of the high-pressure air storage tank, an outlet of the high-pressure air storage tank is connected with an inlet of the expansion unit, the heat storage tank is connected with the compressor unit to recover compression heat, the cold storage tank is connected with the expansion unit to recover expansion cold, the water recovery system comprises a gas-water separator and a water-saving tank, an air outlet of the wet cooling tower is connected with an inlet of the compressor unit, a liquid outlet of the gas-water separator is connected with the water-saving tank, and a heat exchange fluid inlet of the demisting heat exchanger is selectively connected with an outlet of the heat storage tank or an outlet of the cold storage tank. The invention aims to store energy and simultaneously realize low-energy-consumption water conservation and demisting of the wet cooling tower.

Inventors

DENG JIANQIANG
WANG GUOYU
ZHANG LI
LIU YAOSEN
XU CHENGYANG
SHAO QINGSONG
WU QIYANG
WANG CHANGAN

Assignees

西安交通大学

Dates

Publication Date: 20260508
Application Date: 20260317

Claims (10)

1. An energy storage water conservation defogging device of compressed air energy storage and wet cooling tower coupling, characterized in that includes: a wet cooling tower (1); A demisting heat exchanger (2), wherein the demisting heat exchanger (2) is arranged at the upper part of the wet cooling tower (1); The compressed air energy storage system comprises a compressor unit, an expansion unit, a high-pressure air storage tank (3), a heat storage tank (4) and a cold storage tank (5), wherein an outlet of the compressor unit is connected with an inlet of the high-pressure air storage tank (3), an outlet of the high-pressure air storage tank (3) is connected with an inlet of the expansion unit, the heat storage tank (4) is connected with the compressor unit to recover compression heat, and the cold storage tank (5) is connected with the expansion unit to recover expansion cold; a water recovery system comprising a gas-water separator (6) and a water saving tank (7); wherein the air outlet of the wet cooling tower (1) is connected with the inlet of the compressor unit; The gas-water separator (6) is connected to a gas flow path between the compressor unit and the high-pressure gas storage tank (3), and a liquid outlet of the gas-water separator (6) is connected with the water-saving tank (7); The heat exchange fluid inlet of the demisting heat exchanger (2) is selectively connected with the outlet of the heat storage tank (4) or the outlet of the cold storage tank (5).
2. The energy-storage water-saving demisting device coupled with a wet cooling tower according to claim 1, wherein the compressed air energy storage system further comprises a plurality of compressor stage post heat exchangers (8) and a normal temperature tank (9); the compressor unit comprises a plurality of stages of compressors (10), and the outlet of each stage of compressors (10) is connected with the air side inlet of the corresponding compressor stage rear heat exchanger (8); The air side outlet of the compressor stage post heat exchanger (8) is connected with the inlet of a next stage compressor (10) or the high-pressure air storage tank (3); The heat exchange fluid inlet of the compressor-stage post-heat exchanger (8) is connected with the normal-temperature tank (9), and the heat exchange fluid outlet of the compressor-stage post-heat exchanger (8) is connected with the heat storage tank (4).
3. The energy-storing water-saving demisting device coupled with a wet cooling tower according to claim 2, characterized in that the gas-water separator (6) is connected between an air-side outlet of the compressor-stage after-heat exchanger (8) and an inlet of a next-stage compressor (10).
4. The energy-storage water-saving demisting device coupled with a wet cooling tower according to claim 1, wherein the compressed air energy storage system further comprises a plurality of expander-stage pre-heat exchangers (11), a plurality of expander-stage post-heat exchangers (12) and a normal-temperature tank (9); The expansion unit comprises a multi-stage expansion machine (13), wherein the inlet of each stage of expansion machine (13) is connected with the air side outlet of the corresponding expander stage front heat exchanger (11), and the outlet of each stage of expansion machine (13) is connected with the air side inlet of the corresponding expander stage rear heat exchanger (12); The heat exchange fluid inlet of the expander stage front heat exchanger (11) is connected with the heat storage tank (4), and the heat exchange fluid outlet of the expander stage front heat exchanger (11) is connected with the normal temperature tank (9); The heat exchange fluid inlet of the expander-stage heat exchanger (12) is connected with the normal-temperature tank (9), and the heat exchange fluid outlet of the expander-stage heat exchanger (12) is connected with the cold storage tank (5).
5. The energy-storage water-saving demisting device coupled with the compressed air energy storage and wet cooling tower according to claim 1, wherein a valve is arranged between a heat exchange fluid inlet of the demisting heat exchanger (2) and an outlet of the heat storage tank (4), and a valve is arranged between a heat exchange fluid inlet of the demisting heat exchanger (2) and an outlet of the cold storage tank (5).
6. The energy-storage water-saving demisting device coupled with a wet cooling tower by compressed air energy storage according to claim 1, wherein a heat exchange fluid outlet of the demisting heat exchanger (2) is connected with an inlet of the heat storage tank (4) or an inlet of the cold storage tank (5).
7. A method of energy storage and water conservation defogging coupled with a wet cooling tower based on compressed air energy storage of the device of any of claims 1 to 6, comprising: Detecting the working state of the compressed air energy storage system; when the compressor unit is in a working state, introducing hot and humid air exhausted by the wet cooling tower (1) into the compressor unit; compressing and cooling the introduced hot and humid air to condense water vapor in the air; Condensed water is separated through a gas-water separator (6) and stored in a water saving tank (7), and separated compressed air is stored in a high-pressure air storage tank (3); recovering the compression heat and storing in the heat storage tank (4), and When the compressor unit stops working and the wet cooling tower (1) operates, hot water in the heat storage tank (4) or cold water in the cold storage tank (5) is led into the demisting heat exchanger (2), and hot and humid air discharged by the wet cooling tower (1) is treated to eliminate white fog.
8. The energy storage water conservation defogging method coupled to a wet cooling tower of claim 7 wherein said compressing and cooling the incoming hot humid air comprises: the hot and humid air is compressed in multiple stages and cooled after each stage of compression.
9. The energy-storage water-saving demisting method according to claim 7, wherein hot water in the heat storage tank (4) is introduced into the demisting heat exchanger (2) to heat the hot and humid air.
10. The energy-storage water-saving demisting method according to claim 7, wherein cold water in the cold storage tank (5) is introduced into the demisting heat exchanger (2) to cool the hot and humid air.

Description

Energy-storage water-saving demisting device and method for coupling compressed air energy storage with wet cooling tower Technical Field The invention relates to the technical field of energy storage and industrial water conservation, in particular to an energy storage and water conservation defogging device and method for coupling compressed air energy storage with a wet cooling tower. Background The compressed air energy storage is used as a large-scale physical energy storage technology, and is widely applied to the fields of power grid peak shaving and renewable energy source consumption. Meanwhile, the industrial wet cooling tower is used as core equipment of a circulating water system in the industries of electric power, chemical industry, metallurgy and the like, and the running performance of the industrial wet cooling tower directly influences the stability and the economical efficiency of industrial production. The wet cooling tower exchanges heat in a mode of directly contacting water with air, and the water contacts with the air and performs evaporation heat exchange in the heat exchange process, so that the cooling purpose of the working medium to be cooled is realized. This heat exchange mechanism inevitably results in the loss of significant moisture evaporation, resulting in the continued consumption of valuable fresh water resources. Meanwhile, the air discharged from the outlet of the cooling tower is usually in or near a saturated state, and after the saturated wet air meets with the ambient air with relatively low temperature, the water vapor in the saturated wet air is rapidly condensed to form tiny liquid drops, and the tiny liquid drops appear as white plumes. This feathering not only causes visual pollution, but may also have some effect on the surrounding microenvironment in some cases. Aiming at the problem of water resource consumption of the cooling tower, the prior art mainly adopts two types of solutions. One type is to install a mechanical dehydrator in the cooling tower or at the outlet, and to trap the entrained drips by means of impact, centrifugation, etc. For example, patent application publication No. CN113720194A proposes adding a centrifugal fan and a condensing tube on the top of the tower to centrifugally separate and condense the exhaust gas, and patent application publication No. CN222617649U adopts a mechanical vibration filter screen to realize gas-water separation. Such solutions are capable of recovering part of the liquid water, but have limited recovery effect on the gaseous moisture and wear and maintenance problems for long-term operation of the mechanical parts. Another type of solution employs active air water intake technology, which extracts moisture from air by means of cooling condensation, solid adsorption or liquid absorption. However, the technology has the bottleneck of higher energy consumption generally, and literature researches show that the energy consumption per unit water production of the main flow active air water intake technology is about 0.38-1.16 kWh/kg, and the economy is poor when the technology is applied to a large-scale industrial scene. In terms of cooling tower defogging, common technical paths include cooling the exhaust air to precipitate moisture or heating the exhaust air to reduce relative humidity. The two modes respectively need to consume cold energy or heat, and generally depend on external cold and heat source supply, so that the problems of high energy consumption and complex system exist. Some schemes attempt to utilize electric fans or semiconductor refrigeration and the like, and essentially still belong to the category of exchanging energy for environmental benefits. On the other hand, researches on compressed air energy storage systems mainly focus on system efficiency improvement and comprehensive utilization of heat energy. During the energy storage (compression) phase, the air compression process generates a large amount of compression heat, and during the energy release (expansion) phase, the air expansion process generates significant expansion coldness. The prior art generally balances these compression heat and expansion cold within the system to improve the overall electrical energy conversion efficiency of the energy storage system. Disclosure of Invention The invention provides an energy-storage water-saving demisting device and method for coupling compressed air energy storage with a wet cooling tower, aiming at solving the problems existing in the prior art, and achieving low-energy-consumption water saving and demisting of the wet cooling tower while storing energy. In order to solve the technical problems, the invention is realized by the following technical scheme: According to a first aspect of the present invention there is provided an energy storage water conservation demisting device for coupling compressed air energy storage with a wet cooling tower, comprising: A wet cooling tower; The demi