Gas-steam-organic working fluid combined cycle cooling, heating and power system

Abstract

The present invention provides a gas-steam-organic working fluid combined cycle cooling, heating and power cogeneration system, which relates to the technical field of gas treatment. The gas-steam-organic working fluid combined cycle cooling, heating and power cogeneration system includes a heating device, an organic working fluid power generation system, a waste heat power generation system and a heating system. The heating device of the gas-steam-organic working fluid combined cycle cooling, heating and power cogeneration system provided by the present invention can generate electricity by burning gas, and utilize the heating system to perform heat exchange with an organic working fluid condenser and a steam condenser, so that the gas-steam-organic working fluid combined cycle cooling, heating and power cogeneration system can be applied to places where the distance between coal mine industrial sites and gas power generation sites is long, solving the problem that the extraction heating parallel lithium bromide absorption refrigeration method is restricted by the distance between the coal mine industrial sites and the gas power generation sites, thereby improving the adaptability of the system.

Description

Technical Field

[0001] The invention relates to the technical field of gas treatment, and in particular to a gas-steam-organic working medium combined cycle cooling, heating and power cogeneration system. Background Art

[0002] Coalbed methane, commonly known as "gas", refers to hydrocarbon gas stored in coal seams with methane as the main component, mainly adsorbed on the surface of coal matrix particles, and partially free in coal pores or dissolved in coal seam water. It is a mineral resource associated with coal and an unconventional natural gas. It is a clean, high-quality energy and chemical raw material that has emerged internationally in the past 10 to 20 years. Its calorific value is 2-5 times that of general coal. The calorific value of 1 cubic meter of pure coalbed methane is equivalent to 1.13kg of gasoline and 1.21kg of standard coal. Its calorific value is equivalent to that of natural gas. It can be mixed with natural gas for transportation and use, and it is very clean after combustion. When the concentration of coalbed methane in the air reaches 5%-16%, it will explode when it encounters open flames. This is the root cause of coal mine gas explosion accidents. Coalbed methane is directly discharged into the atmosphere, and its greenhouse effect is about 21 times that of carbon dioxide, which is extremely destructive to the ecological environment. If coalbed methane is mined before coal mining, the coal mine gas explosion rate will be reduced by 70% to 85%. In the past two decades, coalbed methane has been widely developed and utilized, generating huge economic, environmental and social benefits.

[0003] Low-concentration gas refers to coalbed methane with a methane concentration of less than 30%. When the low gas concentration is ≥8%, the internal combustion engine power generation technology has been widely used; when the ultra-low gas concentration is 1%≤<8%, it is utilized through thermal storage oxidation technology, and there are successful industrial application cases at coal mine sites.

[0004] Among the publicly available technical solutions for utilizing gas for combined cooling, heating and power generation, the following two have the highest efficiency:

[0005] 1. Low-concentration heating device power generation + waste heat boiler + steam Rankine cycle power generation + air extraction, cylinder jacket water heating and parallel lithium bromide absorption refrigeration.

[0006] 2. Ultra-low concentration gas oxidation + waste heat boiler + steam Rankine cycle power generation + exhaust heating in parallel with lithium bromide absorption refrigeration.

[0007] If the disclosed steam Rankine-organic working fluid Rankine combined cycle power generation and heating technology is combined, the efficiency can be further improved and the following two technical routes can be obtained:

[0008] 3. Power generation by low-concentration heating device + waste heat boiler + steam Rankine cycle power generation + organic working fluid Rankine cycle power generation (using steam condenser heat + cylinder jacket water heat + exhaust heat) + exhaust air, cylinder jacket water heating and parallel lithium bromide absorption refrigeration.

[0009] 4. Ultra-low concentration gas oxidation + waste heat boiler + steam Rankine cycle power generation + organic working fluid Rankine cycle power generation (using steam condenser heat + exhaust heat) + exhaust air heating in parallel with lithium bromide absorption refrigeration.

[0010] Taking the third option as an example, the power generation efficiency can be increased by about 10% compared with power generation using only a low-concentration heating device, and about 2.5% compared with the first option; taking the fourth option as an example, the power generation efficiency combined with the organic working fluid Rankine cycle is about 1.5% higher than that of the second option.

[0011] However, the current investment per kilowatt for organic working fluid Rankine cycle power generation is very high. In order to pursue the highest theoretical power generation efficiency, the third and fourth schemes sacrifice the steam Rankine cycle power generation and increase the organic working fluid Rankine cycle power generation, resulting in a significant increase in the system's unit kilowatt investment.

[0012] On the other hand, the cooling and heating demands of coal mining enterprises are mainly concentrated in industrial sites, mainly including the following demands: 1. Cooling demand in deep mining coal mines (summer or all year round); 2. Cooling demand for ground buildings (summer); 3. Antifreeze demand for ground shafts (winter); 4. Heating demand for ground buildings (winter); 5. Heating demand for ground bathing hot water (all year round). The cooling and heating loads of these demands have large fluctuations, with seasonal fluctuations of 20% to 100% (such as in the early stages of heating or cooling and extreme weather).

[0013] If the gas utilization system is to match the above heating and cooling needs while taking into account power generation efficiency, the following typical situations will occur:

[0014] 1. Conventional load < waste heat of flue gas at the tail end of gas power generation < extreme load for heating or cooling.

[0015] 2. The waste heat of flue gas at the tail end of gas power generation ≥ the extreme load of heating or cooling.

[0016] For the first case, other alternative heat sources need to be connected in parallel, and for the second case, no other alternative heat sources are needed. However, in the above two cases, the parameters and power generation of the steam-organic working fluid cycle system need to be continuously adjusted according to the changes in the cold and hot loads. This makes the management of the steam Rankine cycle power generation and organic working fluid Rankine cycle power generation systems complicated and not conducive to stable operation.

[0017] In addition, this type of combined cold and heat supply system requires the heat load center to be close to the gas power generation system. If the gas power generation system is far away from the industrial site (or involves land acquisition), there are difficulties in pipeline investment or external worker-farmer relationship coordination, making it difficult to apply. Summary of the invention

[0018] The purpose of the present invention is to provide a gas-steam-organic working fluid combined cycle cooling, heating and power cogeneration system to solve the technical problem that the existing gas utilization system has poor applicability in coal mine industrial sites.

[0019] The present invention provides a gas-steam-organic working fluid combined cycle cooling, heating and power cogeneration system, comprising a heating device, an organic working fluid power generation system, a waste heat power generation system and a heating system;

[0020] The organic working fluid power generation system comprises an organic working fluid expander, an organic working fluid condenser and a first heater; the organic working fluid heated by the first heater sequentially passes through the organic working fluid expander, the organic working fluid condenser and the organic working fluid pressure pump and then enters the first heater to form a cycle;

[0021] The waste heat power generation system comprises a waste heat boiler, a steam expander and a steam condenser. The steam in the waste heat boiler enters the steam expander and the steam condenser in sequence. The condensed water condensed in the steam condenser enters the waste heat boiler under the action of a water pressure pump to form a cycle.

[0022] The heating system includes an exhaust gas heater. The heating device is connected to a gas supply system. The exhaust gas after combustion in the heating device passes through the waste heat boiler, the first heater and the exhaust gas heater in sequence and is then discharged into the atmosphere.

[0023] The heating system is connected to the organic working medium condenser and the steam condenser respectively. The organic working medium performs heat exchange with the water of the heating system in the organic working medium condenser; the steam performs heat exchange with the water of the heating system in the steam condenser.

[0024] Furthermore, the heat supply device is a thermal storage oxidation device.

[0025] Furthermore, the heating device is a gas internal combustion engine, and the organic working fluid power generation system also includes a second heater arranged in parallel with the first heater.

[0026] The gas internal combustion engine has an inner sleeve, the inner sleeve is connected to a water supply pipeline, and water in the water supply pipeline flows back to the gas internal combustion engine after passing through the second heater;

[0027] A first temperature control valve and a first cooling tower are also arranged in parallel on the water supply pipeline, and the first temperature control valve is opened or closed according to the temperature of the water after passing through the second heater.

[0028] Furthermore, it also includes a first heat exchange system connected to the heating system; the heating system also includes a second temperature control valve and a second cooling tower, and the water of the heating system flows into the first heat exchange system after passing through the exhaust gas heater, the organic working fluid condenser and the steam condenser in sequence; the water passing through the first heat exchange system flows into the second temperature control valve and the second cooling tower arranged in parallel, and the second temperature control valve is opened or closed according to the temperature of the water after passing through the first heat exchange system.

[0029] Furthermore, the heating system further comprises an internal circulation pipeline; when the heating system is disconnected from the first heat exchange system, the internal circulation pipeline is used to circulate internally of the heating system.

[0030] Furthermore, it also includes a second heat exchange system and a cold and hot supply system, the second heat exchange system is connected to the cold and hot supply system, and the first heat exchange system and the second heat exchange system can communicate, and the cold and hot supply system and the heating system can communicate.

[0031] Furthermore, the cold and hot supply system includes a first heat pump unit, and the first heat pump unit is used to perform heat exchange between water passing through the first heat exchange system and water in the second heat exchange system.

[0032] Furthermore, the cold and hot supply system also includes a third cooling tower, and the first heat pump unit can perform heat exchange between water passing through the third cooling tower and water in the second heat exchange system.

[0033] Furthermore, the first heat pump unit is connected to a heating system for heating or is connected to a third cooling tower for cooling through a valve on the pipeline.

[0034] Furthermore, the cold and hot supply system also includes a second heat pump unit, which is used to connect to a second heat source. Through a valve on the pipeline, the second heat pump unit is connected to the second heat source for heating or connected to a third cooling tower for cooling.

[0035] The heating device of the gas-steam-organic working fluid combined cycle cooling, heating and power cogeneration system provided by the present invention can generate electricity by burning gas, and utilizes the heating system to exchange heat with an organic working fluid condenser and a steam condenser, so that the gas-steam-organic working fluid combined cycle cooling, heating and power cogeneration system can be applied to places where the distance between coal mine industrial sites and gas power generation sites is long, thereby solving the problem that the exhaust gas heating and parallel lithium bromide absorption refrigeration method is restricted by the distance between the coal mine industrial sites and the gas power generation sites, thereby improving the adaptability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 A schematic diagram of the structure of a gas-steam-organic working fluid combined cycle cooling, heating and power cogeneration system provided in an embodiment of the present invention;

[0038] Figure 2 for Figure 1 The schematic diagram of the connection structure of the power generation system of the gas-steam-organic working fluid combined cycle cooling, heating and power system shown;

[0039] Figure 3 for Figure 1 A schematic diagram of the connection structure between the first heat exchange system and the second heat exchange system of the gas-steam-organic working fluid combined cycle cooling, heating and power cogeneration system shown;

[0040] Figure 4 for Figure 1 Another connection structure schematic diagram of the power generation system of the gas-steam-organic working fluid combined cycle cooling, heating and power system is shown.

[0041] Icons: 100-gas supply system; 200-heating device; 300-second temperature control valve; 400-second heater; 500-first heater; 600-waste heat boiler; 700-exhaust gas heater; 800-first cooling tower; 900-first temperature control valve; 110-organic working fluid expander; 120-organic working fluid condenser; 130-steam expander; 140-steam condenser; 150-second cooling tower; 160-first heat pump unit; 170-second heat pump unit; 180-third cooling tower; 190-organic working fluid power generation system; 210-waste heat power generation system; 220-heating system; 230-first heat exchange system; 240-second heat exchange system; 250-internal circulation pipeline; 260-thermal storage oxidation device; 270-cold and hot supply system. DETAILED DESCRIPTION

[0042] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] like Figure 1-Figure 4 As shown, the present invention provides a gas-steam-organic working fluid combined cycle cooling, heating and power cogeneration system, including a heating device, an organic working fluid power generation system, a waste heat power generation system and a heating system;

[0044] The organic working fluid power generation system 190 includes an organic working fluid expander 110, an organic working fluid condenser 120 and a first heater 500; the organic working fluid heated by the first heater 500 sequentially passes through the organic working fluid expander 110, the organic working fluid condenser 120 and the organic working fluid pressure pump and then enters the first heater 500 to form a cycle;

[0045] The waste heat power generation system 210 includes a waste heat boiler 600, a steam expander 130 and a steam condenser 140. The steam in the waste heat boiler 600 enters the steam expander 130 and the steam condenser 140 in sequence. The condensed water condensed in the steam condenser 140 enters the waste heat boiler 600 under the action of a water pressure pump to form a cycle.

[0046] The heating system 220 includes an exhaust gas heater 700. The heating device is connected to the gas supply system 100. The exhaust gas after combustion in the heating device 200 passes through the waste heat boiler 600, the first heater 500 and the exhaust gas heater 700 in sequence and is discharged into the atmosphere.

[0047] The heating system is connected to the organic working medium condenser 120 and the steam condenser 140 respectively. The organic working medium performs heat exchange with the water of the heating system 220 in the organic working medium condenser 120 ; the steam performs heat exchange with the water of the heating system in the steam condenser 140 .

[0048] In some embodiments, the organic working fluid expander 110 of the organic working fluid power generation system 190 can act externally, that is, the organic working fluid expander 110 is connected to the power generation device for power generation, and the organic working fluid passing through the organic working fluid expander 110 enters the organic working fluid condenser 120 and condenses at the organic working fluid condenser 120; the organic working fluid pressure pump injects the condensed organic working fluid into the first heater 500, and exchanges heat with the tail gas in the first heater 500, so that the temperature of the organic working fluid is increased and vaporized. Generally, low-boiling-point organic substances, such as pentane, are selected as organic working fluids.

[0049] The water in the waste heat power generation system 210 exchanges heat with the high-temperature exhaust gas in the waste heat boiler 600, causing the water to evaporate and form steam. The steam passes through the steam expander 130, and the steam expander 130 is connected to the power generation device to convert mechanical energy into electrical energy, thereby realizing power generation; the steam passing through the steam expander 130 enters the steam condenser 140, and exchanges heat with the water in the heating system 220 in the steam condenser 140, thereby increasing the temperature of the water in the heating system 220 to meet the heating needs of the coal mining enterprise.

[0050] The condensed water at the steam condenser 140 re-enters the waste heat boiler 600 under the action of the water pressure pump, forming a cycle.

[0051] The gas burned in the heating device 200 generates high-temperature exhaust gas, which enters the waste heat boiler 600 of the waste heat power generation system 210. The high-temperature exhaust gas heats the water in the waste heat boiler 600, generating a large amount of steam in the waste heat boiler 600. The waste heat power generation system 210 uses the steam to generate electricity.

[0052] A water pump is provided on the water supply pipeline, and the water passing through the first temperature control valve 900 or the first cooling tower 800 returns to the inner jacket of the heating device 200 under the action of the water pump.

[0053] The water in the heating system 220 enters the organic working medium condenser 120 , and exchanges heat with the organic working medium in the organic working medium condenser 120 , so that the temperature of the organic working medium is reduced and condensed, and the temperature of the water is increased, thereby increasing the temperature of the water in the heating system 220 .

[0054] After the water of the heating system 220 is heated by the tail gas heater 700 , the organic working fluid condenser 120 and the steam condenser 140 , water with a sufficiently high temperature is obtained, thereby realizing the heating of the heating system 220 .

[0055] Since the temperature of the water in the heating system 220 has a certain upper limit, the exhaust gas after combustion of the heating device 200 and the heated water in the jacket are used to heat the heating system 220 after generating electricity through the organic working fluid power generation system 190 and the waste heat power generation system 210, thereby fully utilizing the heat generated by the gas and meeting the electricity and heating needs of the coal mining enterprise.

[0056] The heating system 220 includes an exhaust gas heater 700 , and the exhaust gas is discharged into the atmosphere after passing through the exhaust gas heater 700 .

[0057] The temperature of the exhaust gas passing through the waste heat boiler 600 is reduced, and the reduced temperature exhaust gas exchanges heat with the water in the exhaust gas heater 700 of the heating system 220, so that the temperature of the water in the heating system 220 is increased, thereby achieving heating.

[0058] The gas-steam-organic working fluid combined cycle cooling, heating and power cogeneration system can utilize the gas stored in the coal seam to generate electricity and utilize the exhaust gas for heating, thus meeting the electricity heating needs of coal mining enterprises.

[0059] like Figure 4 As shown, based on the above embodiment, further, the heat supply device 200 is a thermal storage oxidation device 260.

[0060] The heating device 200 adopts a thermal storage oxidation device 260, and the gas supply system 100 is used to input the stored coal seam gas into the thermal storage oxidation device 260. Generally, the gas stored in the coal seam passes through a mixing device, and after being mixed with air in the mixing device, it enters the thermal storage oxidation device 260, and flameless combustion is achieved in the thermal storage oxidation device 260.

[0061] Based on the above embodiment, further, the heating device 200 is a gas internal combustion engine, the organic working fluid power generation system 190 further includes a second heater 400 arranged in parallel with the first heater 500, the gas internal combustion engine has an inner sleeve, the inner sleeve is connected to the water supply pipeline, and the water in the water supply pipeline flows back to the gas internal combustion engine after passing through the second heater 400;

[0062] A first temperature control valve 900 and a first cooling tower 800 are also provided in parallel on the water supply pipeline. The first temperature control valve 900 is opened or closed according to the temperature of the water after passing through the second heater 400.

[0063] The gas supply system 100 is used to input the gas stored in the coal seam into the gas internal combustion engine. Generally, the gas stored in the coal seam passes through a mixing device, is mixed with air in the mixing device, and then enters the gas internal combustion engine to burn in the gas internal combustion engine. The mechanical energy of the gas internal combustion engine can be used to generate electricity, and after the water in the gas internal combustion engine jacket is heated, it enters the first heater 500 of the organic working fluid power generation system 190 through the water supply pipeline, and the heat is transferred to the organic working fluid power generation system 190 in the first heater 500. The organic working fluid power generation system 190 generates electricity using the heat absorbed by the water supply pipeline.

[0064] The temperature of the water after passing through the first heater 500 decreases, and the first temperature control valve 900 controls whether to open the first temperature control valve 900 according to the temperature of the water passing through the first heater 500. When the temperature of the water passing through the first heater 500 is too high, the first temperature control valve 900 is closed, so that the water passing through the first heater 500 enters the first cooling tower 800 and continues to cool down in the first cooling tower 800, thereby ensuring that the temperature of the water entering the jacket of the gas in the gas is low enough.

[0065] The gas burned in the gas internal combustion engine generates high-temperature exhaust gas, which enters the waste heat boiler 600 of the waste heat power generation system 210. The high-temperature exhaust gas heats the water in the waste heat boiler 600, generating a large amount of steam in the waste heat boiler 600. The waste heat power generation system 210 uses the steam to generate electricity.

[0066] A water pump is provided on the water supply pipeline, and the water passing through the first temperature control valve 900 or the first cooling tower 800 returns to the inner jacket of the gas internal combustion engine under the action of the water pump.

[0067] like Figure 2As shown, based on the above embodiments, further, the heating system 220 includes an exhaust gas heater 700, a second temperature control valve 300 and a second cooling tower 150. The water of the heating system 220 flows into the first heat exchange system 230 after passing through the exhaust gas heater 700, the organic working fluid condenser 120 and the steam condenser 140 in sequence; the water passing through the first heat exchange system 230 flows into the second temperature control valve 300 and the second cooling tower 150 arranged in parallel, and the second temperature control valve 300 opens or closes the second temperature control valve 300 according to the temperature of the water after passing through the first heat exchange system 230.

[0068] The heating system 220 is connected to the first heat exchange system 230, which can be set in a building, a mine wellhead room, or other places. The first heat exchange system 230 exchanges heat between the hot water provided by the heating system 220 and the air in the first heat exchange system 230 to reduce the water temperature and increase the air temperature in the building.

[0069] The water exchanged with heat by the first heat exchange system 230 passes through the second temperature control valve 300, and the second temperature control valve 300 is opened or closed according to the temperature of the water. When the water temperature is high, the second temperature control valve 300 is closed, and the water entering the first heat exchange system 230 from the heating system 220 flows into the second cooling tower 150. After being cooled in the second cooling tower 150, it enters the heating system 220 again. The cooled water passes through the exhaust gas heater 700 first, which can reduce the temperature of the exhaust gas passing through the exhaust gas heater 700, reduce the temperature of the exhaust gas discharged into the atmosphere, and reduce energy waste.

[0070] Based on the above embodiment, further, an internal circulation pipeline 250 is included. When the heating system 220 does not need to be connected to the first heat exchange system 230, the internal circulation pipeline 250 enables the internal circulation of the heating system 220.

[0071] The heating system 220 is provided with an internal circulation pipeline 250. When it needs to be separated from the first heat exchange system 230, the water in the heating system 220 does not flow through the first heat exchange system 230 and flows back into the heating system 220, but directly flows through the internal circulation pipeline 250 and then flows back into the heating system 220; when the heating system 220 is not needed for heating, the heating system 220 is separated from the first heat exchange system 230.

[0072] Based on the above embodiment, further, it also includes a second heat exchange system 240 and a cold and hot supply system 270, the second heat exchange system 240 is connected to the cold and hot supply system 270, and the first heat exchange system 230 and the second heat exchange system 240 can be connected, and the cold and hot supply system 270 can be connected to the heating system 220.

[0073] like Figure 3 As shown, based on the above embodiment, further, the second heat exchange system 240 includes a first heat pump unit 160, and the first heat pump unit 160 is used to perform heat exchange between the water passing through the first heat exchange system 230 and the water in the second heat exchange system 240.

[0074] The heat of the heating system 220 can generally meet the heating needs of the first heat exchange system 230 for the building. The temperature of the water passing through the first heat exchange system 230 is reduced and cannot meet the heating needs of the second heat exchange system 240 for the building. The first heat pump unit 160 exchanges heat between the water in the second heat exchange system 240 and the water passing through the first heat exchange system 230, extracts the return water heat of the first heat exchange system 230 to increase the water temperature in the second heat exchange system 240, thereby meeting the heating needs of the second heat exchange system 240 for the building.

[0075] The first heat pump unit 160 transfers the heat of the water passing through the first heat exchange system 230 to the water in the second heat exchange system 240 through a medium, thereby increasing the temperature of the water in the second heat exchange system 240 and making the temperature of the water in the second heat exchange system 240 meet the heating demand, so that the heating system 220 can provide heating in a wider range, such as air heating in dormitories and mine wellhead rooms.

[0076] The medium may be a refrigerant, such as R134A. Generally, the water flowing through the first heat exchange system 230 enters the evaporator of the first heat pump unit 160, and the water of the second heat exchange system 240 enters the condenser of the first heat pump unit 160. The condenser increases the temperature of the water, and the evaporator decreases the temperature of the water, thereby increasing the temperature of the water in the second heat exchange system 240 and meeting the heating demand of the second heat exchange system 240.

[0077] Based on the above embodiment, further, the cold and hot supply system 270 also includes a third cooling tower 180 , and the first heat pump unit 160 can perform heat exchange between the water passing through the third cooling tower 180 and the water in the second heat exchange system 240 .

[0078] When the cold and hot supply system 270 needs to be cooled, the water in the third cooling tower 180 flows into the condenser of the first heat pump unit 160, and the water in the second heat exchange system 240 flows into the evaporator of the first heat pump unit 160. The evaporator transfers the heat of the water in the second heat exchange system 240 to the water in the third cooling tower 180 of the condenser, thereby cooling the water in the second heat exchange system 240, thereby cooling the building.

[0079] In summer, the outlet water of the condenser of the first heat pump unit 160 can be cooled by the third cooling tower 180 to discharge the heat into the outdoor atmosphere, and the outlet water of the evaporator of the first heat pump unit 160 enters the second heat exchange system 240 for cooling and cooling in summer; in winter, the third cooling tower 180 is cut off from working by a valve, and the hot water of the heating system 220 enters the first heat exchange system 230 and the return water temperature is relatively low (generally below 35°C), and cannot directly heat the building. The return water passing through the first heat exchange system 230 enters the evaporator of the first heat pump unit 160 to extract energy, and returns to the heating system 220 again after the temperature is further reduced (generally not less than 4°C).

[0080] Based on the above embodiments, further, the first heat pump unit 160 is connected to the first heat exchange system 230 for heating or the first heat pump unit 160 is connected to the third cooling tower 180 for cooling through valves on the pipeline.

[0081] When heating is required for the building, the heating system 220 realizes internal circulation through the internal circulation pipeline 250 to meet the heat exchange requirements of the organic working fluid condenser 120 and the steam condenser 140, and a second cooling tower 150 is provided in the heating system 220, which can meet the cooling requirements of the water in the heating system.

[0082] The pipelines of the first heat exchange system 230 and the second heat exchange system 240 are provided with valves, through which the hot water flowing into the first heat pump unit 160 is replaced with cold water of the third cooling tower 180, thereby realizing the refrigeration function of the first heat pump unit 160; the first heat exchange system 230 and the second heat exchange system 240 are connected with each other through the valves on the pipelines, and the water of the first heat exchange system 230 and the second heat exchange system 240 enters the first heat pump unit 160 and exchanges heat with the water passing through the third cooling tower 180, so that the second heat exchange system 240 and the first heat exchange system 230 can cool the building and make the building have a comfortable temperature.

[0083] Based on the above embodiments, further, the cold and hot supply system 270 also includes a second heat pump unit 170, which is used to connect to a second heat source, and connect the second heat pump unit 170 to the second heat source for heating or connect the second heat pump unit 170 to the third cooling tower 180 for cooling through a valve on the pipeline.

[0084] The second heat pump unit 170 can be connected to a second heat source to transfer the heat of the second heat source to the second heat exchange system 240 through the second heat pump unit 170, thereby achieving heating of the building.

[0085] When the second heat pump unit 170 is needed to cool the building, the second heat pump unit 170 is cut off from the second heat source by a valve and connected to the third cooling tower 180; the water in the third cooling tower 180 enters the second heat pump unit 170, and the water heat exchange is realized by the second heat pump unit 170 with the second heat exchange system 240, so that the water in the second heat exchange system 240 is cooled.

[0086] Generally, the first cooling tower 800 and the second cooling tower 150 are closed cooling towers, and the third cooling tower is an open cooling tower.

[0087] The second heat source can be mine return air or mine drainage, etc.

[0088] In winter, the evaporator of the second heat pump unit 170 is used to connect to the second heat source. The condenser of the second heat pump unit 170 heats the return water passing through the first heat exchange system 230, and the return water enters the second heat exchange system 240 again after the temperature rises. To facilitate the operation and adjustment of the system, the heating buildings of the condensers of the first heat pump unit 160 and the second heat pump unit 170 are relatively independent and isolated from the hot water supply of the self-heating system 220 by a valve. The evaporator of the second heat pump unit 170 extracts the heat of the second heat source. The low-grade heat of the second heat source (generally 10-30°C) is extracted by the second heat pump unit 170 and then sent to the second heat exchange system 240 for heating.

[0089] In summer, when the first heat exchange system 230 and the second heat exchange system 240 are not needed for heating, the second heat pump unit 170 is operated in parallel with the first heat pump unit 160 through a valve, and the condenser of the second heat pump unit 170 can continue to be connected to the second heat source for reverse cooling, or it can cut off the connection with the second heat source to achieve the same function as the first heat pump unit 160, and the condenser of the second heat pump unit 170 is connected to the third cooling tower 180, and the evaporators of the first heat pump unit 160 and the second heat pump unit 170 are operated in parallel, cooperating with the first heat exchange system 230 and the second heat exchange system 240 to cool the indoor environment of the surrounding buildings.

[0090] The gas-steam-organic working fluid combined cycle cogeneration system can provide electricity, heating and cooling for coal mining enterprises, and efficiently solve the electricity heating and cooling needs of coal mining enterprises far away from industrial sites. The gas-steam-organic working fluid combined cycle cogeneration system can utilize coal seam gas with a concentration of more than 1% to stably discharge the gas, and the utilization of coal seam gas is beneficial to reduce greenhouse gas emissions (the absolute emission of 1-8% concentration gas is more than twice that of 8% concentration gas), while reducing the probability of coal mine gas explosions and improving the safety of underground workers.

[0091] The first heat pump unit 160 and the second heat pump unit 170 are both prior art, generally including an evaporator, a condenser, a compressor and an expansion valve. A connecting pipe and a water valve are provided between the evaporator and the condenser of the heat pump unit to realize the heating exchange between the evaporator and the condenser.

[0092] The heating device 200 of the gas-steam-organic working fluid combined cycle cooling, heating and power cogeneration system provided by the present invention can generate electricity by burning gas, and utilize the heating system 220 to exchange heat with the organic working fluid condenser 120 and the steam condenser 140, so that the gas-steam-organic working fluid combined cycle cooling, heating and power cogeneration system can be applied to places where the distance between the coal mining industrial site and the gas power generation site is long, solving the problem that the exhaust gas heating parallel lithium bromide absorption refrigeration method is restricted by the distance between the coal mining industrial site and the gas power generation site, thereby improving the adaptability of the system.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A gas-steam-organic working fluid combined cycle cooling, heating and power cogeneration system, characterized in that: It includes a heating device, an organic working fluid power generation system, a waste heat power generation system and a heating system; The organic working fluid power generation system comprises an organic working fluid expander, an organic working fluid condenser and a first heater; the organic working fluid heated by the first heater sequentially passes through the organic working fluid expander, the organic working fluid condenser and the organic working fluid pressure pump and then enters the first heater to form a cycle; The waste heat power generation system comprises a waste heat boiler, a steam expander and a steam condenser. The steam in the waste heat boiler enters the steam expander and the steam condenser in sequence. The condensed water condensed in the steam condenser enters the waste heat boiler under the action of a water pressure pump to form a cycle. The heating system includes an exhaust gas heater, the heating device is connected to the gas supply system, and the exhaust gas after combustion of the heating device passes through the waste heat boiler, the first heater and the exhaust gas heater in sequence before being discharged into the atmosphere; The heating system is connected to the organic working medium condenser and the steam condenser respectively, the organic working medium performs heat exchange with the water of the heating system in the organic working medium condenser; the steam performs heat exchange with the water of the heating system in the steam condenser; The heat supply device is a thermal storage oxidation device; The heating device is a gas internal combustion engine, and the organic working fluid power generation system further includes a second heater connected in parallel with the first heater. The gas internal combustion engine has an inner sleeve, the inner sleeve is connected to a water supply pipeline, and water in the water supply pipeline flows back to the gas internal combustion engine after passing through the second heater; A first temperature control valve and a first cooling tower are also arranged in parallel on the water supply pipeline, and the first temperature control valve is opened or closed according to the temperature of the water after passing through the second heater; It also includes a first heat exchange system connected to the heating system; the heating system also includes a second temperature control valve and a second cooling tower, and the water of the heating system flows into the first heat exchange system after passing through the exhaust gas heater, the organic working fluid condenser and the steam condenser in sequence; the water passing through the first heat exchange system flows into the second temperature control valve and the second cooling tower arranged in parallel, and the second temperature control valve is opened or closed according to the temperature of the water after passing through the first heat exchange system.

2. The gas-steam-organic working fluid combined cycle cooling, heating and power cogeneration system according to claim 1, characterized in that: The heating system further comprises an internal circulation pipeline; when the heating system is disconnected from the first heat exchange system, the internal circulation pipeline is used to circulate inside the heating system.

3. The gas-steam-organic working fluid combined cycle cooling, heating and power system according to claim 1, characterized in that: It also includes a second heat exchange system and a cold and hot supply system, the second heat exchange system is connected to the cold and hot supply system, the first heat exchange system and the second heat exchange system can communicate, and the cold and hot supply system and the heat supply system can communicate.

4. The gas-steam-organic working fluid combined cycle cooling, heating and power cogeneration system according to claim 3, characterized in that: The cold and hot supply system includes a first heat pump unit, which is used to perform heat exchange between water passing through the first heat exchange system and water in the second heat exchange system.

5. The gas-steam-organic working fluid combined cycle cooling, heating and power cogeneration system according to claim 4, characterized in that: The cold and hot supply system also includes a third cooling tower, and the first heat pump unit can perform heat exchange between water passing through the third cooling tower and water in the second heat exchange system.

6. The gas-steam-organic working fluid combined cycle cooling, heating and power cogeneration system according to claim 5, characterized in that: The first heat pump unit is connected to the heating system for heating through valves on the pipeline, or the first heat pump unit is connected to the third cooling tower for cooling.

7. The gas-steam-organic working fluid combined cycle cooling, heating and power cogeneration system according to claim 6, characterized in that: The cold and hot supply system also includes a second heat pump unit, which is used to connect to a second heat source. Through a valve on the pipeline, the second heat pump unit is connected to the second heat source for heating or connected to the third cooling tower for cooling.

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