Pyrolysis and electric hydrogen production and methanol co-production system based on fluidized bed coal-fired power plant

Abstract

The invention discloses a pyrolysis and electric hydrogen production and methanol co-production system based on a fluidized bed coal-fired power plant, which comprises a tire pyrolysis unit, a zeolite heat storage and heat pump heating unit, a methanol synthesis unit and an oxygen-enriched fluidized bed supercritical CO2 power generation unit, and the tire pyrolysis unit cleanly utilizes waste through tire pyrolysis to realize energy conservation and emission reduction; part of pyrolysis products provide part of energy for self pyrolysis, pyrolysis energy consumption is reduced, and combustion products are CO2 and can provide clean raw materials for methanol synthesis; the zeolite heat storage and heat pump heating unit adopts zeolite thermochemical energy storage equipment with higher energy storage density to recover flue gas waste heat, and supplies heat together with air energy through an absorption heat pump at night, so that the heat supply capacity is improved; electric power of an electrolytic cell in the methanol synthesis unit comes from the system, so that purchase of external expensive electric power is reduced, and on-site utilization of energy is realized; the oxygen-enriched fluidized bed supercritical CO2 power generation unit adopts three-stage compression supercritical CO2 power generation circulation and has high power generation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of clean conversion of high-risk wastes, and in particular to a pyrolysis and electric hydrogen production and methanol co-production system based on a fluidized bed coal-fired power station. Background Art

[0003] The supercritical CO2 Brayton cycle (sCO2 cycle) is a highly efficient power generation technology that has received increasing attention as an alternative to the steam cycle in coal-fired power plants. The sCO2 cycle can achieve higher cycle efficiency and faster response to load changes. In addition, it uses non-toxic, non-flammable and inexpensive CO2 as a working fluid, making it an environmentally friendly choice. Adding a recompression cycle is a practical and feasible way to improve system efficiency, and intercooling and reheating are effective ways to improve the efficiency of the recompression cycle. The intercooling process reduces the power consumption of the compressor, and the reheating process increases the average endothermic temperature of the cycle.

[0004] Circulating fluidized bed boiler technology is a relatively mature clean combustion technology with great potential in fuel flexibility, low nitrogen oxide emissions and furnace desulfurization. In addition, circulating fluidized bed boilers have excellent load tracking capabilities and can maintain stable combustion even at 30% of the rated load capacity. Oxygen-enriched combustion fluidized bed boilers are a high-efficiency, low-pollution combustion equipment. Its working principle is to use the fluidization characteristics of the fluidized bed to mix solid fuel and gaseous oxygen for combustion. Compared with traditional combustion methods, oxygen-enriched combustion technology has been optimized in terms of oxygen supply, fuel distribution, combustion reaction, etc., so as to achieve a more complete combustion effect and higher thermal efficiency. Since pure oxygen is used for combustion, although a large amount of oxygen consumption will be generated, the exhaust gas will not contain nitrogen in the air, so the generation of nitrogen oxides can be avoided or greatly reduced, and the emission of other harmful substances can also be reduced, thereby reducing the degree of air pollution. Oxygen-enriched combustion fluidized bed boilers are widely used in chemical, petrochemical, electric power and other fields, and are a very effective technology for energy utilization and environmental protection.

[0005] Waste tires are a common type of waste. Due to their heat-resistant, anti-biological and anti-degradation refractory polymer rubber materials, long-term stacking in the environment will cause serious pollution to the ecological environment. In order to solve this problem, the most widely used method for treating waste tires is pyrolysis technology. By pyrolyzing waste tires under high temperature and oxygen-deficient conditions, they can be converted into high-value products, including pyrolysis oil, pyrolysis gas, carbon black and metal slag. Among them, pyrolysis gas is a combustible gas with a high calorific value and has a wide range of application prospects. Pyrolysis oil can be used as a substitute for fuel oil, thereby reducing the use of fossil fuels. At the same time, the waste residue produced by tire pyrolysis can be recycled after separation and grinding, further improving resource utilization efficiency. Although pyrolysis technology is relatively mature, its yield is still affected by many factors, such as tire type, pyrolysis temperature and pressure, reactor type and catalyst.

[0006] Electrolysis of water is a chemical reaction that decomposes water molecules into oxygen and hydrogen by delivering electrical energy to water. During the electrolysis of water, the chemical bonds of water molecules (H2O) are broken by electrical energy to form hydrogen ions (H + ) and hydroxide ions (OH - ), and then the ions are transferred through electrons to form hydrogen and oxygen. In the electrolysis of water, there are two electrodes: the anode and the cathode. When the current passes through the water, the water molecules are oxidized at the anode to form oxygen molecules (O2) and hydrogen ions (H + ), while a reduction reaction occurs at the cathode to form hydrogen molecules (H2) and hydroxide ions (OH - ). During the process of water electrolysis, electrolytes (such as salt or acid) can be added to water to increase the conductivity of water and improve the reaction efficiency. In addition, conditions such as temperature, pressure and voltage will also affect the efficiency and product selection of water electrolysis. Water electrolysis can be used for hydrogen production, oxygen production, cleaning and disinfection. It is a clean, environmentally friendly and efficient way of energy conversion and can be used as part of the future energy system.

[0007] Traditional methanol synthesis technology uses fossil energy to produce raw gas, which not only pollutes the environment, but also releases a large amount of carbon dioxide, which is not conducive to achieving my country's long-term goal of carbon neutrality. Methanol is a colorless, flammable, and toxic liquid at room temperature and pressure, and is widely used in the fields of transportation, energy, and chemical industry. At present, the production of methanol raw gas mainly comes from fossil fuels, that is, it is produced through coal and natural gas reforming. When raw gas is produced from coal as raw material, it is mainly through coal gasification reaction. The nitrogen and sulfur elements contained in coal will react with water, hydrogen, oxygen, etc. to produce a part of nitrides and sulfides. Although these products will not directly participate in methanol synthesis, they will also cause pollution to the environment.

[0008] Therefore, using hydrogen produced by water electrolysis and CO2 produced by tire pyrolysis to synthesize methanol is a good choice. The product oxygen will not be wasted, but will be used by oxygen-enriched boilers to reduce oxygen production energy consumption. The electricity for water electrolysis can be supplied by its own power generation system, reducing the purchase of expensive external electricity.

[0009] At present, there is no research in this field on the combined use of supercritical CO2 power generation and tire pyrolysis, energy storage, methanol synthesis and other technologies. Therefore, it is necessary to provide a pyrolysis and electric hydrogen production and methanol co-production system based on a fluidized bed coal-fired power plant. Summary of the invention

[0010] The present invention provides a pyrolysis and electric hydrogen production and methanol co-production system based on a fluidized bed coal-fired power plant, aiming to solve the above-mentioned problems existing in the background technology.

[0011] The technical solution provided by the present invention is as follows:

[0012] A pyrolysis and electric hydrogen production and methanol co-production system based on a fluidized bed coal-fired power plant, comprising:

[0013] A tire pyrolysis unit, the tire pyrolysis unit comprising a pyrolyzer, a separator and a supplementary combustion boiler, the pyrolyzer is connected to the separator, the tire enters the pyrolyzer for pyrolysis, is separated by the separator, and the carbon black generated after separation enters the supplementary combustion boiler to provide a heat source for the pyrolyzer;

[0014] A zeolite heat storage and heat pump heating unit, the zeolite heat storage and heat pump heating unit comprising a zeolite thermochemical heat storage device and an absorption heat pump, the zeolite thermochemical heat storage device is connected to the supplementary combustion boiler, a loop is formed between the absorption heat pump and the zeolite thermochemical heat storage device, and the absorption heat pump absorbs and utilizes the heat in the zeolite thermochemical heat storage device;

[0015] A methanol synthesis unit, the methanol synthesis unit comprising an electrolyzer, a mixer and a synthesizer connected in sequence, the mixer being connected to the zeolite thermochemical heat storage device, the H2 generated by the cathode of the electrolyzer and the CO2 generated by the supplementary combustion boiler being mixed in the mixer, and then methanol is synthesized in the synthesizer;

[0016] An oxygen-enriched fluidized bed supercritical CO2 power generation unit includes a fluidized bed boiler and a generator. The O2 produced by the anode of the electrolyzer is utilized by the oxygen-enriched fluidized bed to heat the CO2 fluid and enter the turbine to generate electricity for the generator, and the generator provides electricity to the electrolyzer.

[0017] Furthermore, the upper outlet of the separator is connected to a first condenser and an air-oil separator in sequence;

[0018] The lower outlet of the separator is connected with a solid separator, the solid separator is connected with the supplementary combustion boiler, and the supplementary combustion boiler is connected with an air compressor.

[0019] Furthermore, the absorption heat pump comprises a generator, a second condenser, an evaporator and an absorber connected end to end, the second condenser is connected to the absorber, and the generator is connected to the zeolite thermochemical heat storage.

[0020] Furthermore, a humidifier and an air circulation pump are also provided on the loop between the generator and the zeolite thermochemical heat storage device.

[0021] Furthermore, the electrolyzer is connected to a water tank and a water heater, a compressor is arranged between the electrolyzer and the mixer, a heater is arranged between the mixer and the synthesizer, the outlet end of the synthesizer is connected to a flash evaporator and a gas separator, and the gas separator is connected to a methanol storage tank.

[0022] Further, the fluidized bed boiler is connected to an air separator, the fluidized bed boiler comprises a boiler superheater and a fluidized bed, and the outlet of the boiler superheater is connected to the inlet of the turbine;

[0023] The outlet of the turbine is connected to the low-pressure side inlet of the high-temperature regenerator, the high-pressure side outlet of the high-temperature regenerator is connected to the working medium inlet of the boiler superheater, the low-pressure side outlet of the high-temperature regenerator is connected to the low-pressure side inlet of the medium-temperature regenerator, the low-pressure side outlet of the medium-temperature regenerator is respectively connected to the low-pressure side inlets of the first recompressor and the low-temperature regenerator, the outlet of the first recompressor is connected to the high-pressure outlet of the medium-temperature regenerator and then connected to the high-pressure inlet of the high-temperature regenerator, the low-pressure outlet of the low-temperature regenerator is respectively connected to the low-pressure side inlets of the second recompressor and the secondary low-temperature regenerator, the second recompressor is connected to the high-pressure outlet of the low-temperature regenerator and then connected to the high-pressure inlet of the medium-temperature regenerator, the low-pressure outlet of the secondary low-temperature regenerator is connected to the second condenser and the second main compressor, the outlet of the second main compressor is respectively connected to the first condenser and the third recompressor, the first condenser is connected to the first main compressor, the first main compressor is connected to the high-pressure inlet of the secondary low-temperature regenerator, the high-pressure outlet of the secondary low-temperature regenerator is connected to the high-pressure inlet of the low-temperature regenerator and then connected to the third recompressor.

[0024] Furthermore, the turbine is connected to the first re-compressor, the second re-compressor, the third re-compressor, the first main compressor, the second main compressor and the generator in sequence.

[0025] Furthermore, the working medium in the generator is aqueous ammonia;

[0026] The second condenser and the absorber are networked with the user's water pipeline.

[0027] Furthermore, the CO2 fluid entering the turbine has a temperature of 630°C and a pressure of 29.4 MPa;

[0028] The temperature of the flue gas entering the zeolite thermochemical heat storage device is 250°C-300°C.

[0029] Furthermore, the hydrogen gas produced by the cathode of the electrolyzer enters the compressor and is compressed to 8.0 MPa, mixed with the CO2 flue gas produced by the supplementary combustion boiler in the mixer, and the product is heated to 220° C. in the heater.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. Tire pyrolysis cleanly utilizes waste to achieve energy conservation and emission reduction. Part of the pyrolysis products provide part of the energy for its own pyrolysis, reducing the energy consumption of pyrolysis. The combustion product is CO2, which can provide clean raw materials for methanol synthesis.

[0032] 2. Use zeolite thermochemical energy storage equipment with higher energy storage density to recover flue gas waste heat, and provide heating through absorption heat pump and air energy at night to improve heating capacity.

[0033] 3. The electricity for the electrolyzer in methanol synthesis comes from the system itself, reducing the purchase of expensive external electricity and achieving local energy utilization.

[0034] 4. The hydrogen synthesized from methanol comes from the electrolyzer, CO2 comes from the combustion of carbon black produced by tire pyrolysis, and the generated oxygen is used in the oxygen-enriched fluidized bed boiler, which reduces the energy consumption of oxygen production in the air separator, saves energy and reduces emissions, and realizes multi-effective utilization of energy.

[0035] 5. It adopts a three-stage compressed supercritical CO2 power generation cycle, which has a higher power generation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic flow diagram of a pyrolysis and electric hydrogen production and methanol co-production system based on a fluidized bed coal-fired power station of the present invention;

[0037] The reference numerals are as follows:

[0038] 1-tire, 2-pyrolyzer, 3-separator, 4-first condenser, 5-gas-oil separator, 6-pyrolysis gas, 7-pyrolysis oil, 8-solid separator, 9-metal slag, 10-air, 11-air compressor, 12-supplementary boiler, 13-carbon black, 14-zeolite thermochemical heat storage, 15-humidifier, 16-air circulation pump, 17-absorption heat pump, 18-generator, 19-second condenser, 20-absorber, 21-evaporator, 22-user, 23-water tank, 24-water heater, 25-electrolyzer, 26-compressor, 27-mixer, 28-heater, 29-synthesizer, 30-flash evaporator, 31-gas separator , 32-methanol storage tank, 33-air separator, 34-fluidized bed boiler, 35-boiler superheater, 36-fluidized bed, 37-coal powder, 38-turbine, 39-first recompressor, 40-second recompressor, 41-third recompressor, 42-first main compressor, 43-second main compressor, 44-generator, 45-high temperature regenerator, 46-medium temperature regenerator, 47-low temperature regenerator, 48-secondary low temperature regenerator, 49-first condenser, 50-second condenser, 100-tire pyrolysis unit, 200-zeolite heat storage and heat pump heating unit, 300-methanol synthesis unit, 400-oxygen-enriched fluidized bed supercritical CO2 power generation unit. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the embodiments described below are part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0040] Therefore, the detailed description of the embodiments of the present application provided below in conjunction with the accompanying drawings is intended to represent only selected embodiments of the present application, and is not intended to limit the scope of protection claimed in the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0041] It should be understood that in the description of the embodiments of the present invention, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features.

[0042] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0043] See also Figure 1 The present invention provides a pyrolysis and electric hydrogen production and methanol co-production system based on a fluidized bed coal-fired power plant, which is applied to a coal-fired power plant and includes:

[0044] The tire pyrolysis unit 100 includes a pyrolyzer 2, a separator 3 and a supplementary combustion boiler 12. The pyrolyzer 2 is connected to the separator 3. The tire enters the pyrolyzer 2 for pyrolysis and is separated by the separator 3. The carbon black 13 generated after the separation enters the supplementary combustion boiler 12 to provide a heat source for the pyrolyzer 2.

[0045] Zeolite heat storage and heat pump heating unit 200, the zeolite heat storage and heat pump heating unit includes a zeolite thermochemical heat storage device 14 and an absorption heat pump 17, the zeolite thermochemical heat storage device 14 is connected to the supplementary combustion boiler 12, and a loop is formed between the absorption heat pump 17 and the zeolite thermochemical heat storage device 14, and the absorption heat pump 17 absorbs and utilizes the heat in the zeolite thermochemical heat storage device 14.

[0046] The methanol synthesis unit 300 includes an electrolytic cell 25, a mixer 27 and a synthesizer 29 connected in sequence. The mixer 27 is connected to the zeolite thermochemical heat storage device 14. The H2 generated at the cathode of the electrolytic cell 25 and the CO2 generated in the supplementary combustion boiler 12 are mixed in the mixer 27 and then synthesized into methanol in the synthesizer 29.

[0047] The oxygen-enriched fluidized bed supercritical CO2 power generation unit 400 includes a fluidized bed boiler 34 and a generator 44. The O2 produced at the anode of the electrolyzer 25 is utilized by the oxygen-enriched fluidized bed to heat the CO2 fluid and enter the turbine 38 to generate electricity for the generator 44. The generator 44 provides electricity to the electrolyzer 25.

[0048] Optionally, the upper outlet of the separator 3 is connected to the first condenser 4 and the gas-oil separator 5 in sequence. The tire 1 enters the pyrolyzer 2 (720°C) and the pyrolysis product enters the separator 3. The product at the upper outlet of the separator 3 enters the first condenser 4 and is sent to the gas-oil separator 5. After separation, pyrolysis gas 6 and pyrolysis oil 7 are generated.

[0049] The lower outlet of the separator 3 is connected to a solid separator 8, which is connected to a supplementary combustion boiler 12, and the supplementary combustion boiler 12 is connected to an air compressor 11. One of the products of the solid separator 8 is metal slag 9, and another product is partly sent to the supplementary combustion boiler 12, and partly sent out as carbon black 13. Air 10 enters the air compressor 11 (compressed to 8.3 MPa), and then burns in the supplementary combustion boiler 12 together with the carbon black 13 to provide a heat source for the pyrolyzer 2.

[0050] Optionally, the absorption heat pump 17 includes a generator 18 , a second condenser 19 , an evaporator 21 and an absorber 20 connected end to end, the second condenser 19 is connected to the absorber 20 , and the generator 18 is connected to the zeolite thermochemical heat storage 14 .

[0051] Optionally, a humidifier 15 and an air circulation pump 16 are further provided on the loop between the generator 18 and the zeolite thermochemical heat storage device 14 .

[0052] The flue gas (289°C) generated by the supplementary combustion boiler 12 enters the zeolite thermochemical energy storage device 14 (150°C) during the day, heats and dries the zeolite particles therein, and the crystal water absorbs and loses heat, thereby achieving heat storage.

[0053] The circulating air is driven by the air circulation pump 16 at night, humidified by the humidifier 15, and enters the zeolite thermochemical energy storage device 14. The dried zeolite inside absorbs moisture in the circulating air after storing energy during the day. The zeolite captures water molecules and releases heat. The circulating air is heated (110°C) and sent to the absorption heat pump 17 generator 18 to drive the heat pump.

[0054] Optionally, the electrolyzer 25 is connected to a water tank 23 and a water heater 24, a compressor 26 is arranged between the electrolyzer 25 and the mixer 27, a heater 28 is arranged between the mixer 27 and the synthesizer 29, the outlet end of the synthesizer 29 is connected to a flash evaporator 30 and a gas separator 31, and the gas separator 31 is connected to a methanol storage tank 32.

[0055] Optionally, the fluidized bed boiler 34 is connected to an air separator 33 . The fluidized bed boiler 34 includes a boiler superheater 35 and a fluidized bed 36 . The outlet of the boiler superheater 35 is connected to the inlet of a turbine 38 .

[0056] Specifically, the water in the water tank 23 enters the water heater 24 and then enters the electrolyzer 25. The electricity for the electrolyzer 25 is provided by the oxygen-enriched fluidized bed supercritical CO2 power generation unit. The hydrogen produced by the cathode of the electrolyzer 25 enters the compressor 26 for compression (8.0 MPa), and then is mixed with the CO2 flue gas produced by the supplementary combustion boiler 12 in the mixer 27. The product is heated in the heater 28 (220°C), and after heating, enters the synthesizer 29 to generate the product. The product is separated into crude methanol in the flash evaporator 30, and the crude methanol is separated into methanol in the gas separator 31 and sent to the methanol storage tank 32 for storage.

[0057] The outlet of the turbine 38 is connected to the low-pressure side inlet of the high-temperature regenerator 45, the high-pressure side outlet of the high-temperature regenerator 45 is connected to the working medium inlet of the boiler superheater 35, the low-pressure side outlet of the high-temperature regenerator 45 is connected to the low-pressure side inlet of the medium-temperature regenerator 46, the low-pressure side outlet of the medium-temperature regenerator 46 is respectively connected to the low-pressure side inlets of the first recompressor 39 and the low-temperature regenerator, the outlet of the first recompressor 39 merges with the high-pressure outlet of the medium-temperature regenerator 46 and is connected to the high-pressure inlet of the high-temperature regenerator 45, the low-pressure outlet of the low-temperature regenerator 47 is respectively connected to the outlet of the second recompressor 40 and the secondary low-temperature regenerator 48. The low-pressure side inlet is connected, the second re-compressor 40 is connected to the high-pressure outlet of the low-temperature regenerator 47 and then connected to the high-pressure inlet of the medium-temperature regenerator 46, the low-pressure outlet of the secondary low-temperature regenerator 48 is connected to the second condenser 50 and the second main compressor 43, the outlet of the second main compressor 43 is respectively connected to the first condenser 49 and the third re-compressor 41, the first condenser 49 is connected to the first main compressor 42, the first main compressor 42 is connected to the high-pressure inlet of the secondary low-temperature regenerator 48, and the high-pressure outlet of the secondary low-temperature regenerator 48 is connected to the high-pressure inlet of the low-temperature regenerator after merging with the third re-compressor 41.

[0058] Specifically, the oxygen generated by the air separator 33 and the anode product oxygen of the electrolytic cell 25 are sent to the fluidized bed boiler 34 together, and the coal powder 37 enters the fluidized bed 36 of the fluidized bed boiler 34 and burns to generate heat to heat the CO2 fluid in the boiler superheater 35.

[0059] The power generation unit adopts a three-stage compression cycle, in which the heated CO2 fluid (630℃ / 29.4MPa) enters the turbine 38 to perform work, and after performing work (520℃), enters the high-temperature regenerator 45 to cool (400℃), and then enters the medium-temperature regenerator 46 to cool again (250℃), and part of the fluid at the outlet of the medium-temperature regenerator 46 enters the first recompressor 39 for compression (380℃), and the outflowing fluid enters the high-temperature regenerator 45 for heating (500℃), and another part of the fluid at the outlet of the medium-temperature regenerator 46 enters the low-temperature regenerator 47 for cooling (90℃), and part of the fluid at the outlet of the low-temperature regenerator 47 enters the second recompressor 40 for compression (210℃) The outflowing working fluid enters the medium-temperature reheater 46 for heating (390°C), and another part of the working fluid at the outlet of the low-temperature reheater 47 enters the secondary low-temperature reheater 48 for cooling (70°C). The working fluid at the outlet of the secondary low-temperature reheater 48 enters the second condenser 50 (40°C) and is sent to the second main compressor 43 for compression (55°C). A part of the compressed working fluid is sent to the first condenser 49 (50°C) and is compressed by the first main compressor 42 (60°C) and sent to the secondary low-temperature reheater 48 for heating (65°C). Another part of the compressed working fluid is sent to the third re-compressor 41 for compression (65°C) and sent to the low-temperature reheater 47 for heating (230°C).

[0060] Optionally, the turbine 38 is connected to the first re-compressor 39 , the second re-compressor 40 , the third re-compressor 41 , the first main compressor 42 , the second main compressor 43 and the generator 44 in sequence.

[0061] The oxygen-enriched fluidized bed supercritical CO2 power generation unit generates electricity through the generator 44 and sends part of the electricity to the electrolyzer 25, reducing the purchase of external electricity.

[0062] Optionally, the working medium in the generator 18 is aqueous ammonia.

[0063] The second condenser 19 and the absorber 20 are networked with the water pipeline of the user 22 .

[0064] The working medium (ammonia water) of the absorption heat pump 17 is heated in the generator 18, and the low-boiling-point working fluid inside is evaporated and sent to the second condenser 19. The condensed low-boiling-point working fluid is cooled and reduced in pressure and sent to the evaporator 21 to be heated and evaporated by the air, and then sent to the absorber 20 to be absorbed by the concentrated solution of the low-boiling-point working fluid and release heat. The heat released is absorbed by the hot network water in the absorber 20.

[0065] The hot water (50°C) from the user 22 at night is first heated (65°C) in the absorber 20 of the absorption heat pump 17, then heated (80°C) in the second condenser 19, and sent back to the user for heating.

[0066] Optionally, the CO2 fluid entering the turbine 38 has a temperature of 630°C and a pressure of 29.4 MPa;

[0067] The temperature of the flue gas entering the zeolite thermochemical heat storage device 14 is 250°C-300°C.

[0068] The above is only the best specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application shall be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A pyrolysis and electric hydrogen production and methanol co-production system based on a fluidized bed coal-fired power plant, characterized in that: include: A tire pyrolysis unit, the tire pyrolysis unit comprising a pyrolyzer, a separator and a supplementary combustion boiler, the pyrolyzer is connected to the separator, the tire enters the pyrolyzer for pyrolysis, is separated by the separator, and the carbon black generated after separation enters the supplementary combustion boiler to provide a heat source for the pyrolyzer; A zeolite heat storage and heat pump heating unit, the zeolite heat storage and heat pump heating unit comprising a zeolite thermochemical heat storage device and an absorption heat pump, the zeolite thermochemical heat storage device is connected to the supplementary combustion boiler, a loop is formed between the absorption heat pump and the zeolite thermochemical heat storage device, and the absorption heat pump absorbs and utilizes the heat in the zeolite thermochemical heat storage device; A methanol synthesis unit, the methanol synthesis unit comprising an electrolyzer, a mixer and a synthesizer connected in sequence, the mixer being connected to the zeolite thermochemical heat storage device, the H2 generated by the cathode of the electrolyzer and the CO2 generated by the supplementary combustion boiler being mixed in the mixer, and then methanol is synthesized in the synthesizer; An oxygen-enriched fluidized bed supercritical CO2 power generation unit includes a fluidized bed boiler and a generator. The O2 produced by the anode of the electrolyzer is utilized by the oxygen-enriched fluidized bed to heat the CO2 fluid and enter the turbine to generate electricity for the generator, and the generator provides electricity to the electrolyzer.

2. The pyrolysis and electric hydrogen production and methanol co-production system based on a fluidized bed coal-fired power plant according to claim 1 is characterized by: The upper outlet of the separator is connected to the first condenser and the gas-oil separator in sequence; The lower outlet of the separator is connected with a solid separator, the solid separator is connected with the supplementary combustion boiler, and the supplementary combustion boiler is connected with an air compressor.

3. The pyrolysis and electric hydrogen production and methanol co-production system based on a fluidized bed coal-fired power plant according to claim 1 is characterized by: The absorption heat pump comprises a generator, a second condenser, an evaporator and an absorber connected end to end, the second condenser is connected to the absorber, and the generator is connected to the zeolite thermochemical heat storage.

4. The pyrolysis and electric hydrogen production and methanol co-production system based on a fluidized bed coal-fired power plant according to claim 3 is characterized by: A humidifier and an air circulation pump are also provided on the loop between the generator and the zeolite thermochemical heat storage device.

5. The pyrolysis and electric hydrogen production and methanol co-production system based on a fluidized bed coal-fired power plant according to claim 1 is characterized by: The electrolyzer is connected to a water tank and a water heater, a compressor is arranged between the electrolyzer and the mixer, a heater is arranged between the mixer and the synthesizer, the outlet end of the synthesizer is connected to a flash evaporator and a gas separator, and the gas separator is connected to a methanol storage tank.

6. The pyrolysis and electric hydrogen production and methanol co-production system based on a fluidized bed coal-fired power plant according to claim 1 is characterized by: The fluidized bed boiler is connected to an air separator, the fluidized bed boiler comprises a boiler superheater and a fluidized bed, and the outlet of the boiler superheater is connected to the inlet of the turbine; The outlet of the turbine is connected to the low-pressure side inlet of the high-temperature regenerator, the high-pressure side outlet of the high-temperature regenerator is connected to the working medium inlet of the boiler superheater, the low-pressure side outlet of the high-temperature regenerator is connected to the low-pressure side inlet of the medium-temperature regenerator, the low-pressure side outlet of the medium-temperature regenerator is respectively connected to the low-pressure side inlets of the first recompressor and the low-temperature regenerator, the outlet of the first recompressor is connected to the high-pressure outlet of the medium-temperature regenerator and then connected to the high-pressure inlet of the high-temperature regenerator, the low-pressure outlet of the low-temperature regenerator is respectively connected to the low-pressure side inlets of the second recompressor and the secondary low-temperature regenerator, the second recompressor is connected to the high-pressure outlet of the low-temperature regenerator and then connected to the high-pressure inlet of the medium-temperature regenerator, the low-pressure outlet of the secondary low-temperature regenerator is connected to the second condenser and the second main compressor, the outlet of the second main compressor is respectively connected to the first condenser and the third recompressor, the first condenser is connected to the first main compressor, the first main compressor is connected to the high-pressure inlet of the secondary low-temperature regenerator, the high-pressure outlet of the secondary low-temperature regenerator is connected to the high-pressure inlet of the low-temperature regenerator and then connected to the third recompressor.

7. The pyrolysis and electric hydrogen production and methanol co-production system based on a fluidized bed coal-fired power plant according to claim 6 is characterized by: The turbine is connected to the first recompressor, the second recompressor, the third recompressor, the first main compressor, the second main compressor and the generator in sequence.

8. The pyrolysis and electric hydrogen production and methanol co-production system based on a fluidized bed coal-fired power plant according to claim 3 or 4, characterized in that: The working medium in the generator is ammonia water; The second condenser and the absorber are networked with the user's water pipeline.

9. The pyrolysis and electric hydrogen production and methanol co-production system based on a fluidized bed coal-fired power plant according to claim 6, characterized in that: The CO2 fluid entering the turbine has a temperature of 630°C and a pressure of 29.4 MPa; The temperature of the flue gas entering the zeolite thermochemical heat storage device is 250°C-300°C.

10. The pyrolysis and electric hydrogen production and methanol co-production system based on a fluidized bed coal-fired power plant according to claim 5, characterized in that: The hydrogen gas produced by the cathode of the electrolyzer enters the compressor and is compressed to 8.0 MPa, mixed with the CO2 flue gas produced by the supplementary combustion boiler in the mixer, and the product is heated to 220° C. in the heater.

Images