Mine geothermal and solar heating, refrigerating and carbon dioxide capturing system

Abstract

The invention relates to the technical field of carbon dioxide capture, in particular to a mine geothermal and solar heating, refrigerating and carbon dioxide capture system. According to the system, low-grade mine water geothermal energy serves as a low-temperature heat source, the high-temperature heat pump system and the solar energy system are used for preparing high-temperature hot water, the prepared hot water can be used for heating a user and can drive the regenerative absorption jet refrigeration system to refrigerate, and chilled water prepared by the regenerative absorption jet refrigeration system can be used for refrigerating a cold user; the refrigerating capacity of the regenerative jet refrigerating system can be a carbon dioxide adsorption bed cold source in the carbon dioxide capture system, and the carbon dioxide adsorption bed is regenerated. Heat collection is achieved through the solar system matched with the high-temperature heat pump system, the heat collection system, the regenerative absorption jet refrigeration system and the carbon dioxide capture system are coupled, the effects of supplying cold and heat and reducing the content of carbon dioxide in the mine environment are achieved, and then the mine operation environment is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon dioxide capture, and in particular to a mine geothermal and solar heating, cooling and carbon dioxide capture system. Background Art

[0003] In terms of mine water cooling and heat conversion equipment, ordinary heat pumps are currently mainly used, and the output hot water temperature is 45°C. There are few reports on the use of high-temperature heat pumps.

[0004] Among them, carbon dioxide is a harmful gas in coal mines, mainly existing in coal seams and coal blocks, and is discharged together with biogas during the mining process. In addition, carbon dioxide is also produced by the decay of wood in the tunnel, breathing of people and blasting. Due to its high density, carbon dioxide generally accumulates in the lower part of the tunnel and in waste tunnels with poor ventilation. High concentrations of carbon dioxide can cause symptoms such as suffocation, headaches, and difficulty breathing.

[0005] In addition, as an inexhaustible renewable resource, solar energy has attracted extensive attention from countries around the world due to its many advantages such as rich energy storage, wide distribution, cleanliness and safety. Solar thermal utilization is one of the technologies with the highest technical content, the fastest industrial development and the largest market contribution in the current new energy field.

[0006] Based on this, there is an urgent need for a system that can fully utilize mine geothermal and / or solar thermal energy and achieve heating, cooling and carbon dioxide capture to avoid waste of resources. Summary of the invention

[0007] The purpose of the invention is to solve the problems existing in the prior art. The present invention provides a mine water geothermal solar-driven heating, cooling and mine air carbon dioxide capture system.

[0008] In order to solve the problems existing in the prior art, the present invention adopts the following technical solutions:

[0009] A mine geothermal and solar heating, cooling and carbon dioxide capture system, comprising a heat collection system, a heat recovery absorption jet refrigeration system and a carbon dioxide capture system respectively connected to the heat collection system;

[0010] The heat collection system includes a high-temperature heat pump circulation system that utilizes the heat of mine water, a solar energy system and a hot water tank. The high-temperature heat pump system and / or the solar energy system use the obtained heat energy to produce hot water, and the hot water is stored in the hot water tank;

[0011] The mine water geothermal energy is used as a low-temperature heat source, and hot water is produced by the high-temperature heat pump system, and hot water is produced by the solar energy system at the same time. The hot water produced by the solar energy system and the hot water produced by the high-temperature heat pump system are collected in the hot water tank;

[0012] The heat recovery absorption jet refrigeration system utilizes the hot water in the hot water tank to drive the heat recovery absorption jet refrigeration system to achieve a refrigeration effect;

[0013] The carbon dioxide capture system includes a carbon dioxide adsorption bed connected to the hot water tank. The carbon dioxide desorbed from the carbon dioxide adsorption bed is stored in a carbon dioxide tank to reduce the carbon dioxide concentration in the mine.

[0014] As an improvement on the technical solution of the mine geothermal and solar heating, cooling and carbon dioxide capture system of the present invention, the water outlet of the hot water tank is respectively connected to the heat recovery absorption jet refrigeration system, the heat user and the carbon dioxide capture system, which are respectively used for cooling, heating and carbon dioxide desorption regeneration.

[0015] As an improvement of the technical solution of the mine geothermal and solar heating, refrigeration and carbon dioxide capture system of the present invention, the heat recovery absorption jet refrigeration system includes a generator and a lithium bromide solution circulation system;

[0016] The outlet end of the generator is connected to the lithium bromide solution circulation system and the heat collection system respectively.

[0017] As an improvement on the technical solution of the mine geothermal and solar heating, cooling and carbon dioxide capture system of the present invention, the lithium bromide solution circulation includes the generator, a solution regenerator connected to the generator in sequence, a solution pressure reducing valve and an absorber, and the absorber also returns to the solution regenerator and / or the generator through a solution pump. The heat recovery absorption jet refrigeration system utilizes the absorption effect of the lithium bromide solution to achieve refrigeration.

[0018] As an improvement on the technical solution of the mine geothermal and solar heating, cooling and carbon dioxide capture system of the present invention, the outlet end of the generator is also connected to an ejector, the outlet of the ejector is connected to a regenerator and an evaporator in sequence, the outlet of the evaporator is connected to the inlet of the ejector, and the ejector, the regenerator and the evaporator form a cycle.

[0019] As an improvement on the technical solution of the mine geothermal and solar heating, refrigeration and carbon dioxide capture system of the present invention, the outlet of the evaporator is also respectively connected to the absorber and the chilled water tank in the lithium bromide solution circulation system, and the chilled water tank is respectively connected to the cold user and the carbon dioxide adsorption bed, which are used for refrigeration and mine air carbon dioxide capture respectively; and the carbon dioxide adsorption bed is connected to the outside world, the outside mine air enters the carbon dioxide adsorption bed, and the treated low-temperature mine air is again introduced into the mine.

[0020] Beneficial effects of the present invention:

[0021] 1. In the present invention, low-grade mine water geothermal energy is used as a low-temperature heat source, and a high-temperature heat pump system and a solar energy system are used to produce high-temperature hot water. The produced hot water can be used for heating users, and can drive a heat recovery type absorption jet refrigeration system for refrigeration. The chilled water produced by the heat recovery type absorption jet refrigeration system can be used for refrigeration for cooling users. The refrigeration capacity of the heat recovery type absorption jet refrigeration system can be used as a cold source for the carbon dioxide adsorption bed in the carbon dioxide capture system, regenerating the carbon dioxide adsorption bed, and under the action of the carbon dioxide adsorption bed, the carbon dioxide desorbed from the carbon dioxide adsorption bed is stored in a carbon dioxide tank to reduce the carbon dioxide concentration in the mine;

[0022] 2. The present invention is aimed at the fields of industrial preheating, solar energy, geothermal energy, biomass energy, etc., and realizes heat collection by cooperating with the solar energy system of the high-temperature heat pump system, and realizes the effects of cooling, heating and reducing the carbon dioxide content in the mine environment by coupling the heat collection system, the heat recovery absorption jet refrigeration system and the carbon dioxide capture system, thereby improving the mine working environment;

[0023] 3. The present invention has the advantages of simple and compact structure, significant energy-saving effect, stable and reliable operation, and convenient control. It can switch different operation strategies according to different energy requirements of heat, cold, and reducing carbon dioxide content in mine air, so as to realize flexible and intelligent operation of the system;

[0024] 4. The present invention integrates a solar energy system, a high-temperature heat pump system, a heat recovery absorption jet refrigeration system and a carbon dioxide capture system. It is the first time to use the geothermal energy of mine water and solar energy to reduce the carbon dioxide content in the mine environment. The treated low-temperature mine air is introduced into the mine again, thereby improving the working environment of the mine.

[0025] 5. The present invention can also be applied to scenarios such as biomass energy and industrial waste heat recovery, and plays an important role in alleviating mine energy shortages, reducing environmental pollution, and improving mine working environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the present invention.

[0027] Explanation of the reference numerals: 1- mine water pool; 2- heat pump evaporator; 3- compressor; 4- heat pump condenser; 5- heat pump throttle valve; 6- solar collector; 7- hot water tank; 8- carbon dioxide adsorption bed; 9- carbon dioxide tank; 10- heat user; 11- generator; 12- ejector; 13- condenser; 14- throttle valve; 15- evaporator; 16- absorber; 17- chilled water tank; 18- mine air; 19- cold user; 20- regenerator; 21- solution pump; 22- solution pressure reducing valve; 23- solution regenerator. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and beneficial effects of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] like Figure 1 As shown, a heating, cooling and mine air 18 carbon dioxide capture system includes a heat collection system, a heat recovery absorption jet refrigeration system and a carbon dioxide capture system respectively connected to the heat collection system; the heat collection system includes a high-temperature heat pump circulation system using the heat of mine water, a solar energy system and a hot water tank 7, and the high-temperature heat pump system and / or the solar energy system use the obtained heat energy to produce hot water, and the hot water is stored in the hot water tank 7;

[0030] The mine water geothermal energy is used as a low-temperature heat source, and hot water is produced by a high-temperature heat pump system. At the same time, hot water is produced by a solar energy system. The hot water produced by the solar energy system and the hot water produced by the high-temperature heat pump system are collected in a hot water tank 7;

[0031] The heat recovery absorption jet refrigeration system utilizes the hot water in the hot water tank 7 to drive the heat recovery absorption jet refrigeration system to achieve the refrigeration effect;

[0032] The carbon dioxide capture system includes a carbon dioxide adsorption bed 8 connected to a hot water tank 7. The carbon dioxide desorbed from the carbon dioxide adsorption bed 8 is stored in a carbon dioxide tank 9 to reduce the carbon dioxide concentration in the mine.

[0033] In the present invention, low-grade mine water geothermal energy is used as a low-temperature heat source, and a high-temperature heat pump system and a solar energy system are used to produce high-temperature hot water. The produced hot water can be used for heating users 10, and can drive a heat recovery absorption jet refrigeration system for refrigeration. The chilled water produced by the heat recovery absorption jet refrigeration system can be used for refrigeration by cold supply users 19. The cooling capacity of the heat recovery absorption jet refrigeration system can be a cold source for the carbon dioxide adsorption bed 8 in the carbon dioxide capture system, regenerating the carbon dioxide adsorption bed 8, and the carbon dioxide desorbed from the carbon dioxide adsorption bed 8 is stored in the carbon dioxide tank 9 to reduce the carbon dioxide concentration in the mine.

[0034] That is, in the present invention, for the fields of industrial preheating, solar energy, geothermal energy, biomass energy, etc., heat collection is achieved through a solar energy system in conjunction with a high-temperature heat pump system, and the coupling of the heat collection system, the heat recovery absorption jet refrigeration system, and the carbon dioxide capture system is achieved to achieve the effects of cooling, heating and reducing the carbon dioxide content in the mine environment, thereby improving the mine working environment.

[0035] The solar energy system includes a solar energy collector 6 , which is connected to a hot water tank 7 , so that the solar energy collector 6 can produce hot water and store it in the hot water tank 7 .

[0036] Among them, in the heat recovery absorption injection refrigeration system, the injection system is coupled with the absorption system, the refrigerant flow of the condenser 12 and the evaporator 15 is increased, and the system performance is improved.

[0037] In some embodiments of the present invention, the high-temperature heat pump circulation system includes a heat pump evaporator 2 connected to the mine, and the heat pump evaporator 2 is connected to the compressor 3, the heat pump condenser 4, the heat pump throttle valve 5 and the heat pump evaporator 2 in sequence through a pipeline to form a high-temperature heat pump cycle, and the circulating working fluid is used to release heat in the high-temperature heat pump cycle to obtain high-temperature hot water through the heat and store it in the hot water tank 7.

[0038] Preferably, the circulating working fluid is R245fa. R245fa is a hydrofluorocarbon, also known as pentafluoropropane or HFC-245fa, with a chemical formula of CF3CH2CHF2. It is a colorless, transparent, easy-flowing liquid with volatility, a boiling point of 15.3°C, and is stable at room temperature and pressure. R245fa is mainly used in the fields of refrigeration and foaming agents. As a refrigerant, it is widely used in organic Rankine cycle systems (ORC), for power generation systems such as low-temperature waste heat (such as flue gas waste heat, industrial gases, high-temperature fluids, etc.), solar energy, biomass energy, geothermal energy industry, and ocean temperature difference. In addition, R245fa can also be used as a foaming agent for polyurethane foam plastics, replacing traditional CFCs and HCFCs, and is widely used in polyurethane (PU) foaming of refrigerators, cold storages, and building panels. Based on the characteristics of R245fa, the circulating working fluid is R245fa, which can better ensure the safety and stability of the present invention.

[0039] In some embodiments of the present invention, the water outlet of the hot water tank 7 is connected to the heat recovery absorption jet refrigeration system, the heat user 10 and the carbon dioxide capture system, respectively, for refrigeration, heating and carbon dioxide desorption regeneration.

[0040] In some embodiments of the present invention, the heat recovery absorption jet refrigeration system includes a generator 11 and a lithium bromide solution circulation system; the outlet end of the generator 11 is connected to the lithium bromide solution circulation system and the heat collection system respectively.

[0041] The lithium bromide solution circulation includes a generator 11, a solution regenerator 20 connected to the generator 11 in sequence, a solution pressure reducing valve 22 and an absorber 16. The absorber 16 also returns to the solution regenerator 20 and / or the generator 11 through a solution pump 21. The heat recovery absorption jet refrigeration system realizes refrigeration by utilizing the absorption and generation of lithium bromide solution.

[0042] The outlet of the generator 11 is also connected to an ejector 12, the outlet of the ejector 12 is connected to the regenerator 20 and the evaporator 15 in sequence, the outlet of the evaporator 15 is connected to the inlet of the ejector 12, and the ejector 12, the regenerator 20 and the evaporator 15 form a cycle.

[0043] Furthermore, the outlet of the evaporator 15 is also connected to the absorber 16 and the chilled water tank 17 in the lithium bromide solution circulation system respectively. The chilled water tank 17 is connected to the cold user 19 and the carbon dioxide adsorption bed 8 respectively, which are used for refrigeration and carbon dioxide capture of mine air 18 respectively; and the carbon dioxide adsorption bed 8 is connected to the outside world, and the mine air 18 from the outside enters the carbon dioxide adsorption bed 8, and the treated low-temperature mine air 18 is introduced into the mine again.

[0044] In the present invention, low-grade mine water geothermal energy is used as a low-temperature heat source, and a high-temperature heat pump system and a solar energy system are used to produce high-temperature hot water. The produced hot water can be used for heating users 10, and can drive a heat recovery absorption jet refrigeration system for refrigeration. The chilled water produced by the heat recovery absorption jet refrigeration system can be used for refrigeration by cold supply users 19. The cooling capacity of the heat recovery absorption jet refrigeration system can be a cold source for the carbon dioxide adsorption bed 8 in the carbon dioxide capture system to regenerate the carbon dioxide adsorption bed 8.

[0045] In detail, in the present invention, the circulating working fluid absorbs heat from the mine water in the mine water pool 1 in the heat pump evaporator 2 and enters the compressor 3. The compressed high-temperature and high-pressure circulating working fluid steam enters the heat pump condenser 4 to release heat. The water working fluid in the heat pump condenser 4 forms high-temperature hot water, and the high-temperature hot water enters the hot water tank 7. After releasing heat in the heat pump condenser 4, the circulating working fluid passes through the heat pump throttle valve 5 and enters the heat pump evaporator 2 again to complete the high-temperature heat pump cycle.

[0046] At the same time, the high-temperature hot water produced by the solar collector 6 in the solar energy system under the action of solar thermal energy also enters the hot water tank 7. In this way, the effect of using low-grade mine water geothermal energy as a low-temperature heat source and using a high-temperature heat pump system and a solar energy system to produce high-temperature hot water is achieved.

[0047] The hot water in the hot water tank 7 achieves the effect of heating, or based on different purposes, the outlet of the hot water tank 7 is divided into three routes, one of which enters the carbon dioxide adsorption bed 8 in the carbon dioxide capture system to achieve desorption and regeneration through the carbon dioxide adsorption bed 8, and the desorbed carbon dioxide is stored in the carbon dioxide tank 9; the second route enters the heat user 10, so that the heat user 10 can use the prepared hot water for heating or use, thereby solving the heat use problem; the third route enters the generator 11 of the heat recovery absorption jet refrigeration system to achieve driving the heat recovery jet refrigeration system.

[0048] Among them, the regenerative ejector refrigeration system is a refrigeration system using an ejector 12 as a refrigerator. Compared with the traditional compression refrigeration system, the ejector refrigeration system has the advantages of simple structure, no moving parts, few wearing parts, high reliability, long life, low maintenance cost, low-grade heat source, low cost, and easy operation.

[0049] In the present invention, the heat-recovery jet refrigeration system is a refrigeration technology based on the principle of heat pump, which realizes the refrigeration effect through the injection, mixing and pressure expansion process of the working medium in the ejector. At the same time, the introduction of the regenerator enables the system to recover and utilize part of the heat, thereby improving the energy efficiency of the system. The heat-recovery jet refrigeration system includes a lithium bromide solution circulation system, which realizes refrigeration by utilizing the absorption and action of the lithium bromide solution.

[0050] Among them, hot water enters the generator 11 of the heat recovery absorption jet refrigeration system, heats the lithium bromide solution to generate water vapor, and uses the water vapor as the working fluid and is ejected by the ejector 12; at the same time, a part of the water vapor at the outlet of the evaporator 15 passes through the regenerator 20 to heat the low-pressure water vapor, and the water vapor merges and enters the condenser 12, at which time the refrigerant vapor condenses into liquid water; then it enters the evaporator 15 through the throttle valve 14, the liquid evaporates rapidly under low pressure and absorbs heat from the surrounding environment, thereby generating a refrigeration effect, and the produced chilled water enters the chilled water tank 17; at the same time, the high-temperature refrigerant at the outlet of the ejector 12 passes through the regenerator 20 to heat a part of the low-temperature refrigerant at the outlet of the evaporator 15, and after heating, it enters the ejector 12, realizing heat energy recovery and improving system efficiency.

[0051] Another part of the low-temperature and low-pressure steam at the outlet of the evaporator 15 directly enters the absorber 16 in the lithium bromide solution circulation, is absorbed by the lithium bromide concentrated solution in the absorber 16, and produces a re-circulated lithium bromide dilute solution, which enters the solution regenerator 20 through the pressurization effect of the solution pump 21, and after indirect heat exchange with the lithium bromide concentrated solution, enters the generator 11.

[0052] That is, the water vapor at the outlet of the evaporator 15 is divided into two paths, one path directly enters the absorber 16 and is absorbed by the concentrated lithium bromide solution, and the other path serves as an ejector fluid, is ejected by the high-temperature and high-pressure working fluid water vapor at the outlet of the generator 11 through the regenerator 20, and enters the condenser 12 through the ejector 12. The introduction of the ejector 12 increases the refrigerant flow rate of the condenser 12 and the evaporator 15, and the system performance is improved.

[0053] In the generator 11, the lithium bromide solution is used to generate the lithium bromide concentrated solution. The lithium bromide concentrated solution generated in the generator 11 enters the solution regenerator 20, and after indirect heat exchange with the lithium bromide dilute solution, enters the absorber 16 through the solution pressure reducing valve 22 to complete the lithium bromide solution circulation. The solution regenerator 20 is used to recover the heat of the high-temperature lithium bromide concentrated solution generated in the generator 11.

[0054] The outlet of the evaporator 15 is also connected to a chilled water tank 17. The chilled water in the chilled water tank 17 is divided into two paths. One path enters the cold user 19 to provide cooling for the cold user 19, meet the cold user 19's demand for cooling, and then re-enters the evaporator 15.

[0055] The chilled water in the chilled water tank 17 enters the carbon dioxide adsorption bed 88 through another route, absorbs the heat released by the carbon dioxide adsorption bed 8 when adsorbing carbon dioxide in the mine air 18 to maintain the adsorption process, and then enters the evaporator 15.

[0056] The present invention is aimed at the fields of industrial preheating, solar energy, geothermal energy, biomass energy, etc., and realizes heat collection by cooperating with a solar energy system of a high-temperature heat pump system, and couples the heat collection system, a heat recovery absorption jet refrigeration system, and a carbon dioxide capture system to achieve the effects of cooling, heating and reducing the carbon dioxide content in the mine environment, thereby improving the mine working environment.

[0057] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. A mine geothermal and solar heating, cooling, and carbon dioxide capture system, characterized in that: It includes a heat collection system, a heat recovery absorption jet refrigeration system and a carbon dioxide capture system respectively connected to the heat collection system; The heat collection system includes a high-temperature heat pump circulation system that utilizes the heat of mine water, a solar energy system and a hot water tank. The high-temperature heat pump system and / or the solar energy system use the obtained heat energy to produce hot water, and the hot water is stored in the hot water tank; The mine water geothermal energy is used as a low-temperature heat source, and hot water is produced by the high-temperature heat pump system, and hot water is produced by the solar energy system at the same time. The hot water produced by the solar energy system and the hot water produced by the high-temperature heat pump system are collected in the hot water tank; The heat recovery absorption jet refrigeration system utilizes the hot water in the hot water tank to drive the heat recovery absorption jet refrigeration system to achieve a refrigeration effect; The carbon dioxide capture system includes a carbon dioxide adsorption bed connected to the hot water tank. The carbon dioxide desorbed from the carbon dioxide adsorption bed is stored in a carbon dioxide tank to reduce the carbon dioxide concentration in the mine.

2. The mine geothermal and solar heating, cooling, and carbon dioxide capture system according to claim 1, characterized in that: The water outlet of the hot water tank is connected to the heat recovery absorption jet refrigeration system, the heat user and the carbon dioxide capture system, respectively, for refrigeration, heating and carbon dioxide desorption regeneration.

3. The mine geothermal and solar heating, cooling, and carbon dioxide capture system according to claim 1, characterized in that: The regenerative absorption jet refrigeration system comprises a generator and a lithium bromide solution circulation system; The outlet end of the generator is connected to the lithium bromide solution circulation system and the heat collection system respectively.

4. The mine geothermal and solar heating, cooling, and carbon dioxide capture system according to claim 3, characterized in that: The lithium bromide solution cycle includes the generator, a solution regenerator connected to the generator in sequence, a solution pressure reducing valve and an absorber. The absorber also returns to the solution regenerator and / or the generator through a solution pump. The heat recovery absorption jet refrigeration system realizes refrigeration by utilizing the absorption effect of the lithium bromide solution.

5. The mine geothermal and solar heating, cooling, and carbon dioxide capture system according to claim 3, characterized in that: The outlet end of the generator is also connected to an ejector, the outlet of the ejector is connected to a regenerator and an evaporator in sequence, the outlet of the evaporator is connected to the inlet of the ejector, and the ejector, the regenerator and the evaporator form a cycle.

6. The mine geothermal and solar heating, cooling, and carbon dioxide capture system according to claim 5, characterized in that: The outlet of the evaporator is also connected to the absorber and the chilled water tank in the lithium bromide solution circulation system respectively. The chilled water tank is connected to the cold user and the carbon dioxide adsorption bed respectively, and is used for refrigeration and mine air carbon dioxide capture respectively; and the carbon dioxide adsorption bed is connected to the outside world, and the mine air outside enters the carbon dioxide adsorption bed, and the treated low-temperature mine air is introduced into the mine again.

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