CN115324876A - Compressed air energy storage and carbon capture coupling system - Google Patents

Compressed air energy storage and carbon capture coupling system Download PDF

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Publication number
CN115324876A
CN115324876A CN202211062838.4A CN202211062838A CN115324876A CN 115324876 A CN115324876 A CN 115324876A CN 202211062838 A CN202211062838 A CN 202211062838A CN 115324876 A CN115324876 A CN 115324876A
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China
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gas
heat exchanger
liquid
inlet
outlet
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CN202211062838.4A
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Chinese (zh)
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陈龙祥
张留淦
叶楷
汪凤翔
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Quanzhou Institute of Equipment Manufacturing
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Quanzhou Institute of Equipment Manufacturing
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Priority to CN202211062838.4A priority Critical patent/CN115324876A/en
Publication of CN115324876A publication Critical patent/CN115324876A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B41/00—Pumping installations or systems specially adapted for elastic fluids
    • F04B41/02—Pumping installations or systems specially adapted for elastic fluids having reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/06—Cooling; Heating; Prevention of freezing
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

The invention relates to a compressed air energy storage and carbon capture coupling system which comprises a first heat exchanger, a first gas-liquid separator, an engine, a low-pressure compressor, a high-pressure compressor, a second heat exchanger, a third heat exchanger, a first absorption tower, a gas storage tank, a first water turbine, a second gas-liquid separator, a first water pump, a second absorption tower, a second water turbine, a third gas-liquid separator, a second water pump, a gas recovery compressor, a fourth heat exchanger, a throttling valve, a fifth heat exchanger, a high-pressure turbine, a sixth heat exchanger, a low-pressure turbine, a generator, a first cold accumulation device, a first oil pump, a first heat accumulation device, a second oil pump, a second heat accumulation device and a third oil pump.

Description

Compressed air energy storage and carbon capture coupling system
Technical Field
The invention relates to a compressed air energy storage and carbon capture coupling system.
Background
The amino solvent absorption method has wide application range, good absorption capacity and reaction performance, but has the defects of equipment corrosion, high regeneration energy consumption and SO-bearing solvent 2 And O 2 The influence causes degradation and the like. The adsorption separation method has low regeneration energy consumption and reversibility and is suitable for low-concentration CO 2 Capture, but CO 2 The trapping performance needs to be improved, and different adsorbent materials need to be considered in different scenes. The membrane separation method has simple technology, low energy consumption and higher separation purity, but has the problems that the permeability and the selectivity of a polymer membrane are mutually restricted, and the performance is influenced by the conditions of temperature and pressure. The low-temperature separation method can capture and recover liquid CO 2 Is favorable to CO 2 Transportation and sealing. But the energy consumption is high, and the method is only suitable for CO under high concentration and high pressure conditions 2 And (4) trapping. The traditional water-based capture method is simple in technology and environment-friendly, but the method is applied to CO 2 The water demand is large when the concentration is low, the energy consumption is high, and the competitiveness is relatively weak.
Accordingly, the present inventors have made extensive studies to solve the above problems and have made the present invention.
Disclosure of Invention
The invention aims to provide an environment-friendly compressed air energy storage and carbon capture coupling system capable of reducing water resource consumption.
In order to achieve the purpose, the invention adopts the following technical scheme:
a compressed air energy storage and carbon capture coupling system comprises a first heat exchanger, a first gas-liquid separator, an engine, a low-pressure compressor, a high-pressure compressor, a second heat exchanger, a third heat exchanger, a first absorption tower, a gas storage tank, a first water turbine, a second gas-liquid separator, a first water pump, a second absorption tower, a second water turbine, a third gas-liquid separator, a second water pump, a gas recovery compressor, a fourth heat exchanger, a throttle valve, a fifth heat exchanger, a high-pressure turbine, a sixth heat exchanger, a low-pressure turbine, a generator, a first cold accumulation device, a first oil pump, a first heat accumulation device, a second oil pump, a second heat accumulation device and a third oil pump, wherein an air inlet of the first heat exchanger is connected to a flue gas outlet of a power plant, an air outlet of the first heat exchanger is connected to an air inlet of the first gas-liquid separator, the gas outlet of the first gas-liquid separator is connected to the gas inlet of the low-pressure compressor, the gas outlet of the low-pressure compressor is connected to the gas inlet of the second heat exchanger, the gas outlet of the second heat exchanger is connected to the gas inlet of the high-pressure compressor, the gas outlet of the high-pressure compressor is connected to the gas inlet of the third heat exchanger, the gas outlet of the third heat exchanger is connected to the gas inlet of the first absorption tower, the gas outlet of the first absorption tower is connected to the gas storage tank, the liquid outlet of the first absorption tower is connected to the liquid inlet of the second gas-liquid separator through a first water turbine, the gas outlet of the second absorption tower is connected to the liquid inlet of the first absorption tower through a first water pump, the gas outlet of the second absorption tower is connected to the gas inlet of the gas recovery compressor, and the liquid outlet of the second absorption tower is connected to the liquid inlet of the third gas-liquid separator through a second water turbine, the liquid outlet of the third gas-liquid separator is connected to the liquid inlet of the second absorption tower through a second water pump, the gas outlet of the second absorption tower is connected to the gas inlet of a fourth heat exchanger, the gas outlet of the fourth heat exchanger is connected to a gas storage tank, the liquid inlet of the fourth heat exchanger is connected with the liquid outlet of the second cold accumulation device, the liquid outlet of the fourth heat exchanger is connected with the liquid inlet of the second heat accumulation device, the gas storage tank is connected with the gas inlet of the fifth heat exchanger through a throttle valve, the gas outlet of the fifth heat exchanger is connected with the gas inlet of a high-pressure turbine, the gas outlet of the high-pressure turbine is connected with the gas inlet of the sixth heat exchanger, the gas outlet of the sixth heat exchanger is connected with the gas inlet of a low-pressure turbine, a generator, the low-pressure turbine and the high-pressure turbine are in transmission connection, the liquid inlet of the second heat exchanger and the liquid inlet of the third heat accumulation device are both connected with the liquid inlet of the first heat accumulation device, the liquid inlet and the liquid outlet of the fifth heat exchanger are both connected with the liquid inlet of the first heat accumulation device.
As a preferable mode of the present invention, the first cold storage device is connected to both the liquid inlet of the second heat exchanger and the liquid inlet of the third heat exchanger through a first oil pump.
As a preferable mode of the present invention, a liquid outlet of the first heat storage device is connected to both a liquid inlet of the fifth heat exchanger and a liquid inlet of the sixth heat exchanger through a third oil pump.
As a preferable mode of the present invention, a liquid inlet of the fourth heat exchanger is connected to a liquid inlet of the second cold storage device through a second oil pump.
After the technical scheme of the invention is adopted, the invention has the following beneficial effects:
1. the amine solvent carbon capture method commonly used in industry has high energy consumption, can cause the problems of equipment corrosion, solvent degradation and the like, and the water-based carbon capture method is used in the method, has simple technology and is environment-friendly.
2. The traditional water-based carbon capture method directly captures CO at normal pressure 2 The demand for water resources is great. This patent uses pressurized circulating water to absorb CO 2 And then reducing the pressure to CO 2 The water is volatilized and recycled through a water pump and a water turbine, so that the consumption of water resources is greatly reduced.
3. The heat of compression in the traditional compressed air energy storage charging process is absorbed by the heat conduction oil and then used for preheating gas in the discharging process so as to improve the cycle efficiency. This patent is because capture CO in the charging process 2 When the volume of the gas storage tank is constant, more compression heat is absorbed by the heat transfer oil in the charging process. The heat of the heat storage device can be supplied to preheat gas in the discharging process, and can also be used for heating domestic water of residents, so that cogeneration and multiple-effect utilization are realized.
4. The traditional single compressed air energy storage can only achieve the purpose of energy storage and has only single benefit. This patent can also gather the CO that the power plant discharged when again for the peak regulation of power plant's surplus electric power energy storage with compressed air energy storage and carbon gathering coupling 2 And environmental influence is reduced, so that the system has higher application value.
Drawings
FIG. 1 is a flow chart of the system of the present invention.
In the figure:
1-a first heat exchanger; 2-a first gas-liquid separator; 3-an engine; 4-a low pressure compressor; 5-a second heat exchanger; 6-a high-pressure compressor; 7-a third heat exchanger; 8-a first absorption column; 9-a gas storage tank; 10-a first hydraulic turbine; 11-a second gas-liquid separator; 12-a first water pump; 13-a second absorption column; 14-a second hydraulic turbine; 15-a third gas-liquid separator; 16-a second water pump; 17-a gas recovery compressor; 18-a fourth heat exchanger; 19-a throttle valve; 20-a fifth heat exchanger; 21-a high-pressure turbine; 22-a sixth heat exchanger; 23-a low pressure turbine; 24-a generator; 25-a first cold storage device; 26-a first oil pump; 27-a first heat storage device, 28-a second cold storage device, 29-a second oil pump; 30-a second thermal storage device; 31-third oil pump
Detailed Description
In order to further explain the technical solution of the present invention, the following detailed description is made with reference to the embodiments.
Referring to fig. 1, a compressed air energy storage and carbon capture coupling system assists in pressurizing flue gas discharged by a power plant through a compressor unit to improve CO in the flue gas 2 The solubility in water can effectively reduce the energy consumption of the water-based carbon capture method and improve the economic benefit. The system utilizes the surplus power of the power plant to drive the compressor, can store power while performing carbon capture, and improves the power generation flexibility of the power plant.
The flue gas discharged by the power plant mainly consists of H 2 O、CO 2 、N 2 、O 2 And (4) forming. When the high-temperature and high-humidity flue gas is directly introduced into the compressor unit, greater energy consumption is caused. Therefore, a pre-treatment of the flue gas is required before it enters the compressor train. The power plant flue gas (322.15k, 100kpa) is first cooled to near ambient temperature in the first heat exchanger 1. The saturated water in the flue gas is then converted to a liquid phase for discharge from the first separator 2, leaving a CO rich stream 2 Is sent to the compressor train for compression.
In flue gas compressionIn the process (charging process), the surplus power generated by the power plant is used to power the engine 3 for driving the 2-stage compressor set (the low-pressure compressor 4 and the high-pressure compressor 6). After each compression, the heat transfer oil is used to absorb the compressed CO-rich from the second and third heat exchangers 5, 7 2 Of the air. The heat transfer oil is sent from the first cold storage device 25 to each heat exchanger by the first oil pump 26, and is stored in the first heat storage device 27 after heat exchange. Compressed CO-rich 2 After being cooled to near ambient temperature in the third heat exchanger 7, the air enters the first absorption tower 8 for CO 2 And (4) absorbing and trapping.
CO 2 The absorption process is divided into two stages. In the first stage, CO enrichment from the third heat exchanger 7 2 Is in full contact with the circulating water in the first absorption tower 8. Rich in CO 2 Most of the CO in the air 2 And a small amount of N 2 、O 2 Dissolved in the circulating water, so that CO in the water 2 Is higher than the mass fraction of the other gases. The undissolved high pressure gas is sent to a gas storage tank 9 for storage and, at the appropriate time, is released for expansion in a turbine for power generation. Dissolving N 2 、O 2 、CO 2 The circulating water of the mixed gas flows into the first hydraulic turbine 10 to expand and reduce the pressure and generate electricity to recover a part of the electric power. The pressure drop results in a decrease in the solubility of the gas, which allows a portion of the gas to be released from the circulating water. Volatilized gas (N) 2 、O 2 、CO 2 ) And the circulating water are separated in the second gas-liquid separator 11, and then the circulating water is pressurized by the first water pump 12 and flows into the first absorption tower 8 to repeat the absorption process. Volatilizing CO in gas 2 Higher than the mass fraction rich in CO in the compressor train 2 Of air (c). To further enrich CO 2 The same operation is used to introduce the second stage. At this stage, the undissolved gas in the second absorption tower 13 is compressed by the gas recovery compressor 17 and cooled by the fourth heat exchanger 18, and then sent to the gas storage tank 9 for storage, and the heat is stored in the second thermal storage device 30. High purity CO 2 Is discharged from the third gas-liquid separator 15 and is subjected to mineral carbonization or other carbon storage techniquesAnd (7) sealing and storing.
The high-pressure gas stored in the gas storage tank 9 is released at the peak of the power demand (during the discharge process), and converts the pressure energy into electric energy to assist the power plant in supplying power and balance the load of the power grid. The pressure in the gas storage tank 9 will decrease as the gas is discharged, so a throttle valve 19 is required to keep the pressure of the gas entering the turbine constant. Before entering the high-pressure turbine 21 and the low-pressure turbine 23 for expansion, the throttled gas exchanges heat through the fifth heat exchanger 20 and the sixth heat exchanger 22, absorbs heat from heat-conducting oil in the first heat storage device 27, raises the temperature of the inlet gas of the turbine, and increases the output work of the turbine. The heat transfer oil after heat exchange flows into the first cold accumulation device 25 for storage and recycling. The two-stage turbine set drives a generator 24 to generate electricity, which outputs electricity to the grid.
In order to solve the existing industrial CO 2 The problem of high energy consumption in the trapping process of trapping and sealing technology is that a method combining water-based trapping and compressed air energy storage is proposed to carry out CO treatment on the flue gas discharged by a coal-fired power plant 2 And trapping and sealing. Energy consumption of water-based capture process is dependent on CO 2 The solubility in water is realized by introducing a compressed air energy storage technology and utilizing the surplus power of a power plant to drive a compressor unit, so that the smoke is improved to the high pressure of 7.5MPa, and correspondingly CO 2 The partial pressure of (b) also increases. Under the limit of the flue gas concentration of the power plant, CO 2 The partial pressure is increased, so that the solubility of the carbon dioxide in water is improved, and the CO capture is reduced 2 Energy consumption of (2). The unabsorbed gas is stored in a gas storage tank 9 and is released during the peak period of power utilization of the power grid to drive a turbine set to generate power so as to balance the load of the power grid. In addition, the water requirement of the traditional water-based capture method is large, and the CO capture method is used for capturing CO according to the solubility difference formed by the gas pressure difference 2 Dissolving CO under high pressure 2 And then reducing the pressure to CO 2 And the circulating water is separated, and the pressure rising and reducing processes of the circulating water are realized by adopting a water pump and a water turbine, so that the demand on water resources is greatly reduced, and the economic benefit of the system is improved.
The product form of the present invention is not limited to the embodiments, and any suitable changes or modifications of the similar ideas by anyone should be considered as not departing from the patent scope of the present invention.

Claims (4)

1. Compressed air energy storage and carbon entrapment coupled system, its characterized in that: comprises a first heat exchanger, a first gas-liquid separator, an engine, a low-pressure compressor, a high-pressure compressor, a second heat exchanger, a third heat exchanger, a first absorption tower, a gas storage tank, a first water turbine, a second gas-liquid separator, a first water pump, a second absorption tower, a second water turbine, a third gas-liquid separator, a second water pump, a gas recovery compressor, a fourth heat exchanger, a throttle valve, a fifth heat exchanger, a high-pressure turbine, a sixth heat exchanger, a low-pressure turbine, a generator, a first cold accumulation device, a first oil pump, a first heat accumulation device, a second oil pump, a second heat accumulation device and a third oil pump, wherein the gas inlet of the first heat exchanger is connected to a flue gas outlet of a power plant, the gas outlet of the first heat exchanger is connected to the gas inlet of the first gas-liquid separator, the gas outlet of the first gas-liquid separator is connected to the gas inlet of the low-pressure compressor, the gas outlet of the low-pressure compressor is connected to the gas inlet of the second heat exchanger, the gas outlet of the second heat exchanger is connected to the gas inlet of the high-pressure compressor, the gas outlet of the high-pressure compressor is connected to the gas inlet of the third heat exchanger, the gas outlet of the third heat exchanger is connected to the gas inlet of the first absorption tower, the gas outlet of the first absorption tower is connected to the gas storage tank, the liquid outlet of the first absorption tower is connected to the liquid inlet of the second gas-liquid separator through the first water pump, the gas outlet of the second absorption tower is connected to the gas inlet of the gas recovery compressor, the liquid outlet of the second absorption tower is connected to the liquid inlet of the third gas-liquid separator through the second water pump, the liquid outlet of the third gas-liquid separator is connected to the liquid inlet of the second absorption tower through the second water pump, the gas outlet of the second absorption tower is connected to the gas inlet of a fourth heat exchanger, the gas outlet of the fourth heat exchanger is connected to a gas storage tank, the liquid inlet of the fourth heat exchanger is connected with the liquid outlet of a second cold storage device, the liquid outlet of the fourth heat exchanger is connected with the liquid inlet of a second heat storage device, the gas storage tank is connected with the gas inlet of a fifth heat exchanger through a throttle valve, the gas outlet of the fifth heat exchanger is connected with the gas inlet of a high-pressure turbine, the gas outlet of the high-pressure turbine is connected with the gas inlet of a sixth heat exchanger, the gas outlet of the sixth heat exchanger is connected with the gas inlet of a low-pressure turbine, the generator, the low-pressure turbine and the high-pressure turbine are in transmission connection, the liquid inlet of the second heat exchanger and the liquid inlet of the third heat exchanger are both connected with the liquid outlet of the first heat storage device, the liquid outlet of the second heat exchanger and the liquid outlet of the third heat exchanger are both connected with the liquid inlet of the first heat storage device, the liquid inlet and the sixth liquid inlet of the fifth heat exchanger are both connected with the first heat storage device, and the liquid outlet of the fifth heat exchanger are both connected with the liquid inlet of the first heat storage device.
2. The compressed air energy storage and carbon capture coupling system of claim 1, wherein: the first cold accumulation device is connected with the liquid inlet of the second heat exchanger and the liquid inlet of the third heat exchanger through a first oil pump.
3. The compressed air energy storage and carbon capture coupling system of claim 2, wherein: and a liquid outlet of the first heat storage device is connected with a liquid inlet of the fifth heat exchanger and a liquid inlet of the sixth heat exchanger through a third oil pump.
4. The compressed air energy storage and carbon capture coupling system of claim 3, wherein: and a liquid inlet of the fourth heat exchanger is connected with a liquid inlet of the second cold accumulation device through a second oil pump.
CN202211062838.4A 2022-08-31 2022-08-31 Compressed air energy storage and carbon capture coupling system Pending CN115324876A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211062838.4A CN115324876A (en) 2022-08-31 2022-08-31 Compressed air energy storage and carbon capture coupling system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211062838.4A CN115324876A (en) 2022-08-31 2022-08-31 Compressed air energy storage and carbon capture coupling system

Publications (1)

Publication Number Publication Date
CN115324876A true CN115324876A (en) 2022-11-11

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CN202211062838.4A Pending CN115324876A (en) 2022-08-31 2022-08-31 Compressed air energy storage and carbon capture coupling system

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