Biomass pyrolysis coupling thermal power generation system

Abstract

The biomass pyrolysis coupling thermal power generation system comprises a biomass pyrolysis gasification reaction device, the biomass pyrolysis gasification reaction device comprises a plurality of pyrolysis gasification furnaces, and each pyrolysis gasification furnace is provided with a fused salt inlet, a fused salt outlet, a synthesis gas outlet and a material opening; an inlet of the fused salt storage tank is connected with the fused salt outlet of each pyrolysis gasification furnace, and an outlet of the fused salt storage tank is connected with the fused salt inlet of each pyrolysis gasification furnace through a first pipeline; the thermal power generation device comprises a boiler, a steam turbine and a generator; the heating part comprises at least one heat exchanger, the heat exchanger is arranged on the first pipeline so as to heat the fused salt in the first pipeline, and a heat source of the heat exchanger is at least one of smoke exhausted by the boiler, steam exhausted by the boiler and steam exhausted by the steam turbine. Therefore, according to the biomass pyrolysis coupling thermal power generation system, the pyrolysis effect is good, and flexible peak regulation of the thermal power generation device can be facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of biomass pyrolysis, in particular to a biomass pyrolysis coupled thermal power generation system. BACKGROUND

[0002] The development of thermal power generating units is restricted by three factors, i.e. coal consumption, water resources and ecological environment. In order to improve the power generation efficiency of thermal power generating units, reduce coal consumption and CO2 emission intensity, the thermal power plants have carried out flexible transformation in the fuel side. In the fuel flexible transformation, the coal-biomass coupled power generation is the main direction. The coal-biomass coupled power generation can not only promote the substitution of coal energy and increase the supply of biomass energy, but also promote the development of low-carbon emission technology of thermal power generating units, and solve the environmental remediation problems of direct incineration of agricultural and forestry waste, and disorderly stacking of sludge and garbage. In the related technology, the utilization value of biomass products is low, and the combustion efficiency is low. SUMMARY

[0003] The present application aims to at least solve one of the problems in the related art. To this end, the embodiments of the present application propose a biomass pyrolysis coupled thermal power generation system.

[0004] The biomass pyrolysis coupled thermal power generation system of the embodiments of the present application comprises:

[0005] A biomass pyrolysis gasification reaction device, the biomass pyrolysis gasification reaction device comprises a plurality of pyrolysis gasification furnaces, each of the pyrolysis gasification furnaces has a molten salt inlet, a molten salt outlet, a synthesis gas outlet and a material port, the pyrolysis gasification furnaces use molten salt to pyrolyze the biomass raw materials therein, and the gas generated by the pyrolysis of the pyrolysis gasification furnaces can be discharged from the synthesis gas outlet;

[0006] A molten salt storage tank, the inlet of the molten salt storage tank is connected with the molten salt outlet of each of the pyrolysis gasification furnaces, and the outlet of the molten salt storage tank is connected with the molten salt inlet of each of the pyrolysis gasification furnaces through a first pipeline;

[0007] A thermal power generation device, the thermal power generation device comprises a boiler, a steam turbine and a generator, the steam discharged from the boiler can be introduced into the steam turbine so that the steam turbine drives the generator to generate electricity;

[0008] A heating part, the heating part comprises at least one heat exchanger, the heat exchanger is arranged in the first pipeline so as to heat the molten salt in the first pipeline, and the heat source of the heat exchanger is at least one of the flue gas discharged from the boiler, the steam discharged from the boiler and the steam discharged from the steam turbine.

[0009] Therefore, the biomass pyrolysis coupling thermal power generation system has good pyrolysis effect and can facilitate flexible peak regulation of the thermal power generation device.

[0010] In some embodiments, the heating part comprises

[0011] The first heat exchanger has a heat source of steam discharged by at least one of the boiler and the steam turbine;

[0012] The second heat exchanger has a heat source of flue gas discharged by the boiler.

[0013] In some embodiments, the heating part comprises a third heat exchanger, which heats the molten salt in the first pipeline by using electric energy;

[0014] The first heat exchanger, the second heat exchanger and the third heat exchanger are sequentially arranged on the first pipeline in a direction away from the inlet of the first pipeline;

[0015] The molten salt discharged from the cold source outlet of the third heat exchanger has a temperature greater than or equal to 850℃.

[0016] In some embodiments, the steam turbine comprises a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder;

[0017] The main steam outlet of the boiler, the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder, a condenser, a steam pipeline and the steam inlet of the boiler are sequentially connected, and the steam pipeline is provided with a heater;

[0018] The reheated steam outlet of the boiler is connected with the medium-pressure cylinder;

[0019] The heat source inlet of the first heat exchanger is connected with the main steam outlet of the boiler through a first steam extraction pipeline, and / or the heat source inlet of the first heat exchanger is connected with the reheated steam outlet of the boiler through a second steam extraction pipeline;

[0020] The heat source outlet of the first heat exchanger is connected with the inlet of the heater on the steam pipeline;

[0021] The heat source inlet of the second heat exchanger is connected with the first flue gas outlet of the flue duct of the boiler, and the heat source outlet of the second heat exchanger is connected with the flue duct through an exhaust pipeline.

[0022] In some embodiments, the molten salt discharged from the cold source outlet of the first heat exchanger has a temperature greater than or equal to 450℃ and less than or equal to 500℃;

[0023] The molten salt discharged from the cold source outlet of the second heat exchanger has a temperature greater than or equal to 700℃ and less than or equal to 750℃;

[0024] The first flue gas outlet is located between the furnace outlet of the boiler and the location of the economizer in the flue in the extension direction of the flue, and the exhaust duct is provided with a dryer and an induced draft fan;

[0025] The heater on the steam pipeline comprises a low-pressure heater, a deaerator and a high-pressure heater, and the heat source outlet of the first heat exchanger is connected with the inlet of the high-pressure heater.

[0026] In some embodiments, the plurality of pyrolysis gasifiers comprises a plurality of pyrolysis groups, each of which comprises at least one pyrolysis gasifier, and the plurality of pyrolysis groups are sequentially and alternately connected with the first pipeline so that the plurality of pyrolysis groups sequentially and alternately pyrolyze the biomass.

[0027] In some embodiments, each of the molten salt inlets is provided with a second pipeline, and the outlet of the first pipeline is connected with the inlets of the plurality of second pipelines through a first multi-way valve;

[0028] Each of the molten salt outlets is provided with a third pipeline, the inlet of the molten salt storage tank is provided with a fourth pipeline, the inlet of the fourth pipeline is connected with the outlets of the plurality of third pipelines through a second multi-way valve, and the fourth pipeline is provided with a flow regulating valve;

[0029] The outlet of the molten salt storage tank is connected with the first pipeline through a fifth pipeline, the fifth pipeline is provided with a regulating pump, the regulating pump is interlocked with a thermometer in the pyrolysis gasifier, and the regulating pump can adjust the rotating speed according to the temperature in the pyrolysis gasifier;

[0030] Each of the syngas outlets is provided with an eighth pipeline, and the eighth pipeline is provided with an on-off valve.

[0031] In some embodiments, the molten salt storage tank is provided with a breather valve;

[0032] The fifth pipeline is provided with a bypass pipeline, the inlet and outlet of the bypass pipeline are connected with the fifth pipeline, the inlet of the bypass pipeline is located between the regulating pump and the outlet of the fifth pipeline in the extension direction of the fifth pipeline, the outlet of the bypass pipeline is located between the regulating pump and the inlet of the fifth pipeline in the extension direction of the fifth pipeline, and the bypass pipeline is provided with a bypass valve for regulating the flow thereof;

[0033] The outlet of the first pipeline is connected with the molten salt storage tank through a backflow pipeline, and the backflow pipeline is provided with a backflow valve for regulating the flow thereof;

[0034] The bypass valve and the backflow valve are interlocked, and when the opening degree of one of the bypass valve and the backflow valve increases, the opening degree of the other decreases;

[0035] The outlet of the eighth pipeline is connected with the gas inlet of the boiler through a gas pipeline, and a gas control valve is arranged on the gas pipeline.

[0036] In some embodiments, when it is required to increase the power generation of the thermal power plant, the amount of steam supplied by the boiler to the first heat exchanger is reduced;

[0037] When it is required to reduce the power generation of the thermal power plant, the amount of steam supplied by the boiler to the first heat exchanger is increased;

[0038] When it is required to maintain the minimum stable combustion load of the thermal power plant, the boiler stops supplying steam to the first heat exchanger.

[0039] In some embodiments, when it is required to increase the power generation of the thermal power plant, the amount of steam supplied by the boiler to the first heat exchanger is reduced to 50% of the rated load, the backflow valve is closed and the bypass valve is opened;

[0040] When it is required to reduce the power generation of the thermal power plant, the amount of steam supplied by the boiler to the first heat exchanger is increased to 120% of the rated load, the backflow valve is opened and the bypass valve is closed;

[0041] When it is required to maintain the minimum stable combustion load of the thermal power plant, the backflow valve is closed and the bypass valve is opened. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 is a schematic diagram of a biomass pyrolysis gasification reaction device according to an embodiment of the present application.

[0043] Figure 2 is a schematic diagram of a biomass pyrolysis gasification reaction device according to another embodiment of the present application.

[0044] Figure 3 is a schematic diagram of a thermal power plant according to an embodiment of the present application.

[0045] Figure 4 is a schematic diagram of a catalytic section according to an embodiment of the present application.

[0046] Figure 5 is a top view of a catalytic section according to an embodiment of the present application.

[0047] Figure 6 is a schematic diagram of a spray head position according to an embodiment of the present application.

[0048] Figure 7 is a schematic diagram of a filtering section according to an embodiment of the present application.

[0049] Figure 8 is a schematic view of a stack basket according to an embodiment of the present application.

[0050] Reference signs:

[0051] 1. Boiler, 101. Steam outlet, 102. Reheated steam outlet, 103. Steam inlet, 104. Drum, 11. Steam turbine, 111. High pressure cylinder, 112. Intermediate pressure cylinder, 113. Low pressure cylinder, 12. Generator, 13. Condenser, 14. Steam pipe, 141. Low pressure heater, 142. Deaerator, 143. High pressure heater, 15. Flue gas duct;

[0052] 2. Pyrolysis gasifier, 201. First shell, 202. Second shell, 203. Third shell, 21. Molten salt inlet, 22. Molten salt outlet, 23. Syngas outlet, 24. Material inlet, 25. Sealing door, 26. Spray head;

[0053] 31. First pipe, 32. Second pipe, 33. Third pipe, 34. Fourth pipe, 35. Fifth pipe, 36. Fuel gas pipe, 361. Fuel gas control valve, 37. Return pipe, 371. Return valve, 38. Eighth pipe, 39. Bypass pipe, 391. Bypass valve;

[0054] 4. Molten salt storage tank, 42. Flow regulating valve, 43. Regulating pump, 44. Breather valve, 45. On-off valve, 46. First multi-way valve, 47. Second multi-way valve;

[0055] 5. Filtration section, 51. Filtration support, 52. Filtration member, 53. First support frame, 54. Second support frame;

[0056] 6. Catalysis section, 61. Catalysis support, 62. Catalyst;

[0057] 7. Biomass cylinder stack;

[0058] 8. Stack basket, 81. Bottom frame, 82. Top frame, 83. Stud, 84. Rib;

[0059] 91. First heat exchanger, 911. First steam extraction pipe, 912. Second steam extraction pipe, 92. Second heat exchanger, 921. Flue gas duct, 922. Dryer, 923. Induced draft fan, 93. Third heat exchanger. DETAILED DESCRIPTION

[0060] Embodiments of the present application are described in detail below with reference to examples illustrated in the accompanying drawings. The embodiments described below through reference to the drawings are exemplary and are intended to explain the present application, and should not be understood as limiting the present application.

[0061] A biomass pyrolysis coupled thermal power generation system according to an embodiment of the present application is described below with reference to the accompanying drawings. As shown in Figures 1 to 8 The biomass pyrolysis coupled thermal power generation system according to an embodiment of the present application includes a biomass pyrolysis gasification reaction device, a molten salt storage tank 4, a thermal power generation device, and a heating unit.

[0062] The biomass pyrolysis gasification reaction device includes a plurality of pyrolysis gasification furnaces 2. Each pyrolysis gasification furnace 2 has a molten salt inlet 21, a molten salt outlet 22, a syngas outlet 23, and a material port 24. The pyrolysis gasification furnace 2 pyrolyzes biomass raw materials in the furnace using molten salt, and the gas generated by the pyrolysis can be discharged from the syngas outlet 23. Specifically, the pyrolysis gasification furnace 2 has a sealing door 25 for closing the material port 24, and biomass raw materials and pyrolysis solid products can be fed into or discharged from the material port 24. The pyrolysis gasification furnace 2 pyrolyzes biomass raw materials in the furnace using molten salt, thereby generating combustible syngas and pyrolysis solid products.

[0063] The molten salt storage tank 4 is connected to the molten salt outlet 22 of each pyrolysis gasification furnace 2, and the outlet of the molten salt storage tank 4 is connected to the molten salt inlet 21 of each pyrolysis gasification furnace 2 through a first pipeline 31. The molten salt storage tank 4 is used to store molten salt, and the molten salt discharged from the pyrolysis gasification furnace 2 can be fed into the molten salt storage tank 4 and then fed into the pyrolysis gasification furnace 2 again through the first pipeline 31.

[0064] The thermal power generation device includes a boiler 1, a steam turbine 11, and a generator 12. The steam discharged from the boiler 1 can be fed into the steam turbine 11 to drive the generator 12 to generate electricity. Specifically, the steam turbine 11 includes a high-pressure cylinder 111, an intermediate-pressure cylinder 112, and a low-pressure cylinder 113. The main steam outlet 101 of the boiler 1, the high-pressure cylinder 111, the intermediate-pressure cylinder 112, and the low-pressure cylinder 113, a condenser 13, a steam pipeline 14, and the steam inlet 103 of the boiler 1 are connected in sequence, and the steam pipeline 14 is provided with a heater. For example, the outlet of the steam drum 104 on the boiler 1 constitutes the main steam outlet 101 of the boiler 1, and the main steam discharged from the main steam outlet 101 of the boiler 1 refers to the high-temperature and high-pressure dry steam generated by the boiler 1 after being heated by a superheater, which is directly sent to the high-pressure cylinder 111 to do work.

[0065] In some embodiments, the reheated steam outlet 102 of the boiler 1 is connected to the intermediate-pressure cylinder 112. The reheated steam discharged from the reheated steam outlet 102 of the boiler 1 refers to the steam that is heated for the second time in the boiler 1 after the main steam does work in the high-pressure cylinder 111, and is then sent to the intermediate-pressure cylinder 112 or the low-pressure cylinder 113 to continue to do work.

[0066] As shown in Figures 1 to 3As shown, the heating section includes at least one heat exchanger disposed in the first pipe 31 to heat the molten salt within the first pipe 31. The heat source for the heat exchanger is at least one of the flue gas discharged from the boiler 1, the steam discharged from the boiler 1, and the steam discharged from the turbine 11. Thus, at least one of the flue gas discharged from the boiler 1, the steam discharged from the boiler 1, and the steam discharged from the turbine 11 can be used to heat the molten salt within the first pipe 31 using the heat exchanger.

[0067] In some embodiments, the heating element includes a first heat exchanger 91 and a second heat exchanger 92. The heat source for the first heat exchanger 91 is steam discharged from at least one of the boiler 1 and the steam turbine 11. The heat source for the second heat exchanger 92 is flue gas discharged from the boiler 1. The second heat exchanger 92 is located between the first heat exchanger 91 and the outlet of the first pipe 31 in the extension direction of the first pipe 31.

[0068] like Figure 2 As shown, in some embodiments, the heating unit includes a third heat exchanger 93, which uses electrical energy to heat the molten salt in the first pipe 31. The first heat exchanger 91, the second heat exchanger 92, and the third heat exchanger 93 are arranged sequentially on the first pipe 31 in a direction away from the inlet of the first pipe 31, that is, the first heat exchanger 91, the second heat exchanger 92, and the third heat exchanger 93 sequentially heat the molten salt in the first pipe 31.

[0069] In some embodiments, molten salt enters from the cold source inlets of the first heat exchanger 91, the second heat exchanger 92, and the third heat exchanger 93, and is discharged from the cold source outlet after heating. The temperature of the molten salt discharged from the cold source outlet of the first heat exchanger 91 is greater than or equal to 450°C and less than or equal to 500°C, that is, the temperature of the molten salt after heating in the first heat exchanger 91 is greater than or equal to 450°C and less than or equal to 500°C. The temperature of the molten salt discharged from the cold source outlet of the second heat exchanger 92 is greater than or equal to 700°C and less than or equal to 750°C, that is, the temperature of the molten salt after heating in the second heat exchanger 92 is greater than or equal to 700°C and less than or equal to 750°C. The temperature of the molten salt discharged from the cold source outlet of the third heat exchanger 93 is greater than or equal to 850°C, that is, the temperature of the molten salt after heating in the third heat exchanger 93 is greater than or equal to 850°C.

[0070] like Figures 1 to 3As shown, in some embodiments, the heat source inlet of the first heat exchanger 91 is connected to the main steam outlet 101 of the boiler 1 via a first steam intake pipe 911 (pipe a), and / or, the heat source inlet of the first heat exchanger 91 is connected to the reheat steam outlet 102 of the boiler 1 via a second steam intake pipe 912 (pipe b). For example, the heat source inlet of the first heat exchanger 91 is connected to the main steam outlet 101 of the boiler 1 via the first steam intake pipe 911 (pipe a), and the heat source inlet of the first heat exchanger 91 is connected to the reheat steam outlet 102 of the boiler 1 via the second steam intake pipe 912 (pipe b), so that main steam and reheat steam can enter the first heat exchanger 91 through the heat source inlet of the first heat exchanger 91.

[0071] The heat source outlet of the first heat exchanger 91 is connected to the inlet of the heater on the steam pipeline 14. Specifically, the heater on the steam pipeline 14 includes a low-pressure heater 141, a deaerator 142, and a high-pressure heater 143, which are arranged sequentially along the extension direction of the steam pipeline 14 away from its inlet. The heat source outlet of the first heat exchanger 91 (via pipeline e) is connected to the inlet of the high-pressure heater 143 so that the steam after heat exchange in the first heat exchanger 91 can be heated by the high-pressure heater 143.

[0072] like Figures 1 to 3 As shown, the heat source inlet of the second heat exchanger 92 is connected to the first flue gas outlet of the flue 15 of the boiler 1, and the heat source outlet of the second heat exchanger 92 is connected to the flue 15 via the exhaust pipe 921. Specifically, the first flue gas outlet is located between the furnace outlet of the boiler 1 and the economizer in the flue 15 in the extension direction of the flue 15. The exhaust pipe 921 is equipped with a dryer 922 and an induced draft fan 923. The flue gas in the exhaust pipe 921 passes through the dryer 922 and the induced draft fan 923 in sequence before entering the flue 15 and then the chimney.

[0073] like Figures 1 to 8 As shown, in some embodiments, the multiple pyrolysis gasifiers 2 include multiple pyrolysis groups, each pyrolysis group including at least one pyrolysis gasifier 2. The multiple pyrolysis groups are sequentially and alternately connected to the first pipeline 31 so that the multiple pyrolysis groups sequentially and alternately pyrolyze the biomass. Specifically, one of the multiple pyrolysis groups is connected to the first pipeline 31 so that high-temperature molten salt enters the pyrolysis gasifier 2 in that group for pyrolysis, while the pyrolysis gasifiers 2 of other pyrolysis groups can be prepared for feed or undergo maintenance. That is, when other pyrolysis gasifiers 2 are working, at least one pyrolysis group is kept in the raw material preparation and production preparation stage, or in the maintenance stage. For the entire process, production is continuous and stable; for a single pyrolysis group (pyrolysis gasifier 2), production is intermittent.

[0074] Each of the molten salt inlets 21 is provided with a second pipe 32, and the outlet of the first pipe 31 is connected to the inlets of the second pipes 32 through a first multi-way valve 46. Thus, the first pipe 31 can be connected to the corresponding ones of the second pipes 32 through the first multi-way valve 46.

[0075] Each of the molten salt outlets 22 is provided with a third pipe 33, and the inlet of the molten salt tank 4 is provided with a fourth pipe 34, the inlet of the fourth pipe 34 is connected to the outlets of the third pipes 33 through a second multi-way valve 47, and the fourth pipe 34 is provided with a flow regulating valve 42. Thus, the fourth pipe 34 can be connected to the corresponding ones of the third pipes 33 through the second multi-way valve 47. The flow regulating valve 42 can regulate the flow of the molten salt in the fourth pipe 34. For example, the first multi-way valve 46 and the second multi-way valve 47 are multi-way valves, which can open and close multiple inlets and outlets to control the connection of the multiple inlets and outlets. The first multi-way valve 46 and the second multi-way valve 47 can be two-way valves, three-way valves, four-way valves, etc.

[0076] The outlet of the molten salt tank 4 is connected to the first pipe 31 through a fifth pipe 35, and the fifth pipe 35 is provided with a regulating pump 43, which is interlocked with a thermometer in the pyrolysis gasification furnace 2 and can regulate the rotating speed according to the temperature in the pyrolysis gasification furnace 2. The molten salt in the molten salt tank 4 can be discharged through the fifth pipe 35, so that the flow rate (flow) of the molten salt in the fifth pipe 35 can be regulated to allow an appropriate amount of molten salt to enter the first pipe 31.

[0077] Each of the syngas outlets 23 is provided with an eighth pipe 38, and the eighth pipe 38 is provided with an on-off valve 45. The corresponding eighth pipe 38 can be opened or closed through the on-off valve 45.

[0078] The molten salt tank 4 is provided with a breather valve 44, which can discharge steam and gas in the molten salt tank 4 to regulate the pressure in the molten salt tank 4. For example, when the pressure in the molten salt tank 4 is greater than or equal to a first preset value, the breather valve 44 is opened to reduce the pressure in the molten salt tank 4.

[0079] The type of molten salt is determined according to the requirements of the downstream pyrolysis gasification process, and low-temperature molten salt systems, medium-temperature molten salt systems, or high-temperature molten salt systems can be selected. For example, nitrate systems, nitrite systems (KNO3, NaNO3, NaNO2, etc.), chloride systems (NaCl, KCl, MgCl2, CaCl2, etc.), carbonate systems (K2CO3, Na2CO3, Li2CO3), and fluoride systems, etc. Carbonate systems and sulfate systems are preferred.

[0080] The fifth pipeline 35 is provided with a bypass pipeline 39, the inlet and outlet of the bypass pipeline 39 are connected with the fifth pipeline 35, the inlet of the bypass pipeline 39 is located between the regulating pump 43 and the outlet of the fifth pipeline 35 in the extension direction of the fifth pipeline 35, the outlet of the bypass pipeline 39 is located between the regulating pump 43 and the inlet of the fifth pipeline 35 in the extension direction of the fifth pipeline 35, and the bypass pipeline 39 is provided with a bypass valve 391 for regulating the flow thereof. The bypass pipeline 39 can realize accurate regulation of the temperature, pressure and flow of the system by shunting the flow of the molten salt.

[0081] The outlet of the first pipeline 31 is connected with the molten salt storage tank 4 through a return pipeline 37 (pipeline d), and the return pipeline 37 is provided with a return valve 371 for regulating the flow thereof, so that the molten salt discharged from the first pipeline 31 can enter the molten salt storage tank 4.

[0082] The bypass valve 391 is interlocked with the return valve 371, and when the opening of one of the bypass valve 391 and the return valve 371 is increased, the opening of the other is decreased. In this way, the temperature, pressure and flow of the molten salt discharged from the first pipeline 31 can be conveniently controlled. For example, when the bypass valve 391 is opened, the return valve 371 is closed; when the bypass valve 391 is fully closed, the return valve 371 is fully opened.

[0083] The outlet of the eighth pipeline 38 is connected with the gas inlet of the boiler 1 through a gas pipeline 36, and the gas pipeline 36 (pipeline c) is provided with a gas control valve 361. In this way, the synthesis gas discharged from the outlet of the eighth pipeline 38 can enter the boiler 1 for combustion.

[0084] In some embodiments, when it is necessary to increase the power generation of the thermal power plant, the amount of steam introduced by the boiler 1 into the first heat exchanger 91 is reduced. Specifically, when it is necessary to increase the power generation of the thermal power plant, the amount of steam introduced by the boiler 1 into the first heat exchanger 91 is reduced so that the amount of steam introduced by the first heat exchanger 91 is 50% of the rated load, the return valve 371 is closed and the bypass valve 391 is opened.

[0085] When it is necessary to reduce the power generation of the thermal power plant, the amount of steam introduced by the boiler 1 into the first heat exchanger 91 is increased. Specifically, when it is necessary to reduce the power generation of the thermal power plant, the amount of steam introduced by the boiler 1 into the first heat exchanger 91 is increased so that the amount of steam introduced by the first heat exchanger 91 is 120% of the rated load, the return valve 371 is opened and the bypass valve 391 is closed.

[0086] When the thermal power plant needs to be maintained at the minimum stable combustion load (when the thermal power plant needs to be maintained at 20%-30% of the minimum stable combustion load), the boiler 1 stops feeding steam into the first heat exchanger 91. Specifically, when the thermal power plant needs to be maintained at the minimum stable combustion load, the backflow valve 371 is closed and the bypass valve 391 is opened, and the biomass pyrolysis gasification reaction device system is operated only by relying on the molten salt in the molten salt storage tank 4. Thus, the flexibility of the thermal power plant can be realized.

[0087] The biomass pyrolysis coupled thermal power system according to the embodiment of the present application can couple the thermal power plant and the biomass pyrolysis gasification reaction device through the energy storage and heat transfer working medium molten salt. On the one hand, the biomass can be efficiently treated, and high-quality crude synthesis gas (high effective gas content) and biomass coke (the Na and K elements in the biomass coke are partially removed) are by-produced. On the other hand, by changing the storage and release heat mode of the energy storage and heat transfer working medium molten salt, the biomass can be efficiently pyrolyzed and gasified, high-quality synthesis gas and high-value-added biomass coke can be by-produced, and the flexibility of the thermal power plant can be realized.

[0088] Therefore, the biomass pyrolysis coupled thermal power system according to the embodiment of the present application has good pyrolysis effect and can facilitate the flexibility of the thermal power plant.

[0089] As shown in Figures 1 to 8 The present application also provides a pyrolysis gasification furnace 2 suitable for the biomass pyrolysis gasification reaction device according to the embodiment of the present application. The pyrolysis gasification furnace 2 according to the embodiment of the present application comprises a shell, a catalytic part 6 and a filtering part 5.

[0090] The shell has a molten salt inlet 21, a molten salt outlet 22, a synthesis gas outlet 23 and a material port 24. The molten salt inlet 21 is used for feeding molten salt into the pyrolysis gasification furnace 2, the molten salt outlet 22 is used for discharging the molten salt in the pyrolysis gasification furnace 2, and the gas generated by pyrolysis can be discharged from the synthesis gas outlet 23.

[0091] The shell of the pyrolysis gasification furnace 2 comprises a first shell plate, which is a flat plate structure. A sealing door 25 for closing the material port 24 is arranged on the first shell plate, and the sealing door 25 is used for opening and closing the material port 24. Specifically, the first shell plate is a flat plate-shaped plate body on the shell of the pyrolysis gasification furnace 2. Compared with an arc-shaped plate body, the sealing door 25 is more mature in technology on the flat plate structure, and is more convenient to seal. The first shell plate is a flat plate structure, so that after the material port 24 and the sealing door 25 are arranged on the first shell plate, the sealing door 25 has good sealing performance. When the biomass is pyrolyzed, the sealing door 25 can prevent the gas in the pyrolysis gasification furnace 2 from leaking, so as to increase the safety of the pyrolysis process.

[0092] As shown in Figures 4 to 6As shown, the catalytic part 6 is arranged in the housing, and is arranged at the upper part of the pyrolysis gasifier 2. The catalytic part 6 comprises a catalytic support 61 and a catalyst 62, the catalyst 62 is arranged on the catalytic support 61, and the circumferential side of the catalytic support 61 is connected with the inner wall surface of the housing. The synthesis gas outlet 23 is arranged above the catalytic part 6. Specifically, the catalytic support 61 is used to support the catalyst 62, and the catalyst 62 has a plurality of through holes penetrating in the up-down direction, so that the pyrolysis gas passes through the catalyst 62 upwardly and is discharged from the synthesis gas outlet 23. Thus, during the pyrolysis of the biomass raw material, the catalyst 62 can optimize the composition of the gas product and reduce the tar content.

[0093] As shown in the drawings, Figure 5 In some embodiments, the catalyst 62 is a plurality of catalysts 62, and the plurality of catalysts 62 are distributed on the catalytic support 61 in the horizontal direction. For example, four catalysts 62 arranged in a matrix on the catalytic support 61, so that the catalysts 62 can be replaced conveniently.

[0094] As shown in the drawings, Figure 6 In some embodiments, the pyrolysis gasifier 2 is provided with a spray head 26 connected with the molten salt inlet 21, and the spray head 26 is arranged below the catalytic part 6. Specifically, the spray pipe on the spray head 26 penetrates the catalytic part 6 (catalytic support 61) upwardly and downwardly, and is connected with the molten salt inlet 21, so that the catalytic part 6 does not affect the spraying of the molten salt to the biomass raw material.

[0095] As shown in the drawings, Figure 6 and Figure 7 The filter part 5 is arranged in the housing, and is arranged at the lower part of the pyrolysis gasifier 2. The filter part 5 comprises a filter support 51 and a filter 52, the filter 52 is arranged on the filter support 51, and the circumferential side of the filter support 51 is connected with the inner wall surface of the housing. The molten salt outlet 22 is arranged below the filter part 5. Specifically, the filter support 51 is used to support the filter 52, and the filter 52 has a plurality of filter holes for the molten salt to pass through, so that the molten salt can pass through the filter 52 downwardly and be discharged from the molten salt outlet 22 after being heat released in the pyrolysis gasifier 2, so that the discharged molten salt has less impurities.

[0096] In some embodiments, the filter support 51 comprises a first support 53 arranged above the filter 52 and a second support 54 arranged below the filter 52, and the distance between the first support 53 and the second support 54 in the up-down direction is greater than or equal to the thickness of the filter 52. Specifically, the first support 53 can support the biomass raw material, and the second support 54 can support the filter 52.

[0097] In some embodiments, the thickness of the filter element 52 is greater than or equal to 30 mm and less than or equal to 50 mm, and the vertical distance between the first support frame 53 and the second support frame 54 is greater than or equal to 40 mm and less than or equal to 60 mm. For example, the thickness of the filter element 52 is 40 mm, and the vertical distance between the first support frame 53 and the second support frame 54 is 50 mm.

[0098] like Figure 1 As shown, in some embodiments, the shell of the pyrolysis gasification furnace 2 includes a first shell 201, a second shell 202, and a third shell 203 connected sequentially from top to bottom. A molten salt inlet 21 and a syngas outlet 23 are located in the first shell 201, a material outlet 24 is located in the second shell 202, and a molten salt outlet 22 is located in the third shell 203. That is, the second shell 202 is located below the first shell 201 and above the third shell 203, thereby allowing the molten salt inlet 21 and the syngas outlet 23 to be located above the material outlet 24, and the molten salt outlet 22 to be located below the material outlet 24.

[0099] The cavity inside the second shell 202 is the area for biomass pyrolysis. The catalyst section 6 is located in the upper part of the second shell 202 so that the gas generated by biomass pyrolysis can pass through the catalyst section 6 before being discharged upwards, so that the catalyst 62 in the catalyst section 6 can optimize the composition of the syngas products. The filter section 5 is located in the lower part of the second shell 202 so that the molten salt after exothermic discharge can be filtered by the filter section 5 when discharged from the second shell 202.

[0100] The second shell 202 includes two first shell plates and two second shell plates. The two first shell plates are arranged opposite each other in a first horizontal direction, and the thickness direction of both first shell plates is in the first horizontal direction. The two second shell plates are arranged opposite each other in a second horizontal direction, and the thickness direction of both second shell plates is in the second horizontal direction. Any two of the first horizontal direction, the second horizontal direction, and the vertical direction are perpendicular to each other. The sealing door 25 is provided on at least one of the two first shell plates. Specifically, the first shell plates and the second shell plates are alternately connected in the circumferential direction to form the side shell (second shell 202) of the pyrolysis gasifier 2. The two sides of the first shell plate in the second horizontal direction are connected to the two second shell plates respectively, and the two sides of the second shell plate in the first horizontal direction are connected to the two first shell plates respectively. That is to say, the inner and outer circumferential contours of the cross-section of the second shell 202 are both rectangular, thereby facilitating the installation and sealing of the sealing door 25. For example, the sealing door 25 is installed on the furnace wall. The front and rear furnace walls of the pyrolysis gasifier 2 can be opened and closed in pairs or individually. That is, for a single pyrolysis gasifier 2, during intermittent production, the loading of biomass raw materials and the discharge of pyrolysis gasification semi-coke are completed by opening and closing the furnace walls.

[0101] For example, the second shell 202 has a driving cavity, and a driving mechanism is installed in the driving cavity. The driving mechanism includes a telescopic rod arranged in the driving cavity, and a moving part of the telescopic rod is connected with the sealing door 25, so that the driving mechanism can move the sealing door 25. The second shell 202 has a moving groove in communication with the driving cavity, and at least part of the side of the sealing door 25 is located in the moving groove. The moving groove has a sealing member in contact with the sealing door 25. The sealing member is made of a high-temperature-resistant sealing material.

[0102] In some embodiments, the inner circumferential profile of the cross section of one of the first shell 201 and the third shell 203 is circular or rectangular. That is, the first shell 201 and the third shell 203 can be rectangular shells or cylindrical shells. For example, the inner circumferential profile of the cross section of one of the first shell 201 and the third shell 203 is circular.

[0103] In some embodiments, the biomass raw material of the pyrolysis gasifier 2 is a biomass cylindrical pile 7, and the biomass cylindrical pile 7 is a pile made of biomass raw material.

[0104] The pyrolysis gasifier 2 is arranged in a pile basket 8 matched therewith, and the biomass cylindrical pile 7 is matched in the pile basket 8 for pyrolysis. The pile basket 8 includes a bottom frame 81, a top frame 82, vertical ribs 83, and rib ribs 84 located outside the biomass cylindrical pile 7. The outer circumferential profiles of the bottom frame 81 and the top frame 82 are circular, and the bottom frame 81 and the top frame 82 are connected by a plurality of vertical ribs 83 extending in the up-down direction. The rib rib 84 is a circular ring structure, and the rib rib 84 is connected with a plurality of vertical ribs 83. In this way, the pile basket 8 can limit the biomass cylindrical pile 7.

[0105] The distance between the catalytic part 6 and the filtering part 5 in the up-down direction is greater than the size of the biomass cylindrical pile 7 in the up-down direction by a first preset value, and the first preset value is greater than or equal to 300 mm and less than or equal to 800 mm. Thus, the biomass cylindrical pile 7 can be pyrolyzed in the cavity between the catalytic part 6 and the filtering part 5. For example, the distance between the catalytic part 6 and the filtering part 5 in the up-down direction is greater than the size of the biomass cylindrical pile 7 in the up-down direction by 500 mm.

[0106] The size of the cavity of the second shell 202 in the first horizontal direction and the second horizontal direction is greater than the diameter of the biomass cylindrical pile 7 by a second preset value, and the second preset value is greater than or equal to 10 mm and less than or equal to 50 mm. In this way, the cavity of the second shell 202 can accommodate the biomass cylindrical pile 7, reduce space waste, and facilitate pyrolysis of the biomass raw material. For example, the size of the cavity of the second shell 202 in the first horizontal direction and the second horizontal direction is greater than the diameter of the biomass cylindrical pile 7 by 30 mm or 40 mm.

[0107] The biomass pyrolysis coupled power generation system according to the embodiments of the present application includes the following steps when in use:

[0108] S1, the broken and dried biomass is sent into the corresponding pyrolysis gasifier 2. Specifically, in step S1, the biomass is first broken and dried, and then the broken and dried biomass is loaded into the stacking basket 8, and then the stacking basket 8 is sent into the corresponding pyrolysis gasifier 2, so as to send the biomass into the pyrolysis gasifier 2, and complete the feeding.

[0109] In some embodiments, in step S1, the particle size of the broken biomass is less than or equal to 2 centimeters, and / or the moisture content of the dried biomass is less than or equal to 20%. For example, the moisture content of the dried biomass is less than or equal to 10%. For example, the particle size of the broken biomass is 1 centimeter, and the moisture content of the dried biomass is 8%.

[0110] S2, the molten salt heated to the first preset temperature in the heat absorber 1 is introduced into the pyrolysis gasifier 2 filled with biomass to perform pyrolysis, so as to facilitate the production of synthesis gas after the pyrolysis of the biomass.

[0111] In some embodiments, in step S1, the broken and dried biomass is sent into the pyrolysis gasifier 2 of another of the plurality of pyrolysis groups before the biomass in the pyrolysis gasifier 2 of one of the plurality of pyrolysis groups completes pyrolysis. In step S2, after the biomass in the pyrolysis gasifier 2 of one of the plurality of pyrolysis groups completes pyrolysis, the molten salt heated to the first preset temperature in the heat absorber 1 is introduced into the pyrolysis gasifier 2 of another of the plurality of pyrolysis groups filled with biomass to perform pyrolysis.

[0112] Specifically, one of the plurality of pyrolysis groups is in communication with the first outlet 11 in the heat absorber 1, so that the high-temperature molten salt enters the pyrolysis gasifier 2 in the one to perform pyrolysis, and the pyrolysis gasifiers 2 of the other pyrolysis groups can be prepared or maintained. That is, when the other pyrolysis gasifiers 2 are working, one group of pyrolysis groups is in the raw material preparation and production preparation stage, or in the maintenance stage, and the production is continuous and stable for the whole process; for the pyrolysis gasifier 2 of a single pyrolysis group, the production is intermittent. In this way, the plurality of pyrolysis groups can be alternately used to perform pyrolysis on the biomass, so that the production of the biomass pyrolysis gasification method of the present application is continuous and stable, so as to continuously produce synthesis gas.

[0113] As Figure 1As shown, in some embodiments, the plurality of pyrolysis gasifiers 2 comprises two pyrolysis groups. For example, the two pyrolysis gasifiers 2 are divided into two pyrolysis groups, and the two pyrolysis gasifiers 2 are respectively a first pyrolysis gasifier 27 and a second pyrolysis gasifier 28, and the first pyrolysis gasifier 27 and the second pyrolysis gasifier 28 are arranged to be alternately used for pyrolysis. That is, when the first pipeline 31 is communicated with the second pipeline 32 on the first pyrolysis gasifier 27 through the first multi-way valve 46 and the fourth pipeline 34 is communicated with the third pipeline 33 on the first pyrolysis gasifier 27 through the second multi-way valve 47, the first pipeline 31 is not communicated with the second pipeline 32 on the second pyrolysis gasifier 28, and the fourth pipeline 34 is not communicated with the third pipeline 33 on the second pyrolysis gasifier 28, so that the second pyrolysis gasifier 28 can be prepared or maintained.

[0114] In step S1, before the pyrolysis of the biomass in the pyrolysis gasifier 2 of one of the two pyrolysis groups is completed, the crushed and dried biomass is fed into the pyrolysis gasifier 2 of the other of the two pyrolysis groups. In step S2, after the pyrolysis of the biomass in the pyrolysis gasifier 2 of one of the two pyrolysis groups is completed, the molten salt heated to the first preset temperature in the heat absorber 1 is introduced into the pyrolysis gasifier 2 filled with biomass of the other of the two pyrolysis groups for pyrolysis. For example, after the pyrolysis of the biomass in the first pyrolysis gasifier 27 is completed, the molten salt heated to the first preset temperature in the heat absorber 1 is introduced into the second pyrolysis gasifier 28 filled with biomass for pyrolysis, and after the pyrolysis of the biomass in the second pyrolysis gasifier 28 is completed, the molten salt heated to the first preset temperature in the heat absorber 1 is introduced into the first pyrolysis gasifier 27 filled with biomass for pyrolysis.

[0115] In some embodiments, in step S2, after the pyrolysis of the biomass in the pyrolysis gasifier 2 of one of the plurality of pyrolysis groups is completed, the pyrolyzed biomass in the pyrolysis gasifier 2 is discharged. Specifically, the molten salt in the pyrolysis gasifier 2 is discharged first, and then the biomass is discharged.

[0116] In some embodiments, in step S2, the molten salt heated to the first preset temperature in the heat absorber 1 is introduced into the pyrolysis gasifier 2 filled with biomass, so that the molten salt in the pyrolysis gasifier 2 submerges the biomass, and the temperature in the pyrolysis gasifier 2 rises to the pyrolysis temperature. In this way, the requirements of the pyrolysis liquid level and the pyrolysis temperature can be met, so that the pyrolysis of the biomass can be facilitated.

[0117] In some embodiments, in step S2,

[0118] In the initial state, the on-off valve 45 on the eighth pipeline 38 and the flow regulating valve 42 on the fourth pipeline 34 are closed. For example, in the initial state, all the on-off valves 45 on the eighth pipelines 38 are closed.

[0119] Adjust the first multi-way valve 46 so that the first pipeline 31 is connected to the second pipeline 32 of the corresponding biomass-filled pyrolysis gasifier 2 through the first multi-way valve 46, thereby allowing the molten salt discharged from the absorber 1 to enter the corresponding biomass-filled pyrolysis gasifier 2. For example, adjust the first multi-way valve 46 so that the first pipeline 31 is connected to the first pyrolysis gasifier 27 through the first multi-way valve 46, but not connected to the second pyrolysis gasifier 28.

[0120] Adjust the second multi-way valve 47 so that the fourth pipeline 34 is connected to the third pipeline 33 of the corresponding biomass-filled pyrolysis gasifier 2 via the second multi-way valve 47, thereby allowing molten salt from the corresponding biomass-filled pyrolysis gasifier 2 to flow into the fourth pipeline 34. For example, adjust the second multi-way valve 47 so that the fourth pipeline 34 is connected to the first pyrolysis gasifier 27 via the second multi-way valve 47, but not connected to the second pyrolysis gasifier 28.

[0121] Turn on the regulating pump 43 to pass the molten salt heated to the first preset temperature in the absorber 1 into the corresponding biomass-filled pyrolysis gasification furnace 2, so that the biomass-filled pyrolysis gasification furnace 2 can start pyrolysis. For example, pass the molten salt heated to the first preset temperature in the absorber 1 into the first pyrolysis gasification furnace 27.

[0122] When the molten salt introduced into the corresponding biomass-filled pyrolysis gasifier 2 reaches the pyrolysis liquid level, the flow regulating valve 42 on the fourth pipeline 34 is opened. The speed of the regulating pump 43 and the opening degree of the flow regulating valve 42 on the fourth pipeline 34 are adjusted to maintain the pyrolysis liquid level and pyrolysis temperature in the pyrolysis gasifier 2 for pyrolysis of biomass. For example, when the molten salt introduced into the first pyrolysis gasifier 27 reaches the pyrolysis liquid level, the flow regulating valve 42 on the fourth pipeline 34 is opened. The speed of the regulating pump 43 and the opening degree of the flow regulating valve 42 on the fourth pipeline 34 are adjusted to maintain the pyrolysis liquid level and pyrolysis temperature in the first pyrolysis gasifier 27 for pyrolysis of biomass.

[0123] By opening the on / off valve 45 on the eighth pipe 38 of the corresponding pyrolysis gasifier 2 for pyrolysis of biomass, the generated syngas can be discharged. For example, the on / off valve 45 on the eighth pipe 38 of the first pyrolysis gasifier 27 can be opened.

[0124] After performing the above steps on one of the pyrolysis gasifiers 2 in the multiple pyrolysis groups, the on / off valve 45 on the eighth pipeline 38 of the pyrolysis gasifier 2 after pyrolysis is completed is closed, and the pyrolysis gasifier 2 after pyrolysis is completed is emptied. The above steps are then performed on the pyrolysis gasifier 2 of the other pyrolysis group. That is, after pyrolysis is completed, the on / off valve 45 is closed, and the molten salt and pyrolyzed biomass (coke) are discharged, while the other pyrolysis gasifier 2 can simultaneously begin pyrolysis.

[0125] For example, after the above-mentioned steps are implemented on the first pyrolysis gasifier 27, the on-off valve 45 on the eighth pipeline 38 on the first pyrolysis gasifier 27 after pyrolysis is completed is closed, and the first pyrolysis gasifier 27 after pyrolysis is completed is emptied. After the first pyrolysis gasifier 27 is emptied, the flow regulating valve 42 on the fourth pipeline 34 is closed, the first multi-way valve 46 is adjusted so that the first pipeline 31 communicates with the second pyrolysis gasifier 28 through the first multi-way valve 46, and the first pyrolysis gasifier 27 is not communicated, and the molten salt heated to the first preset temperature in the heat absorber 1 is introduced into the second pyrolysis gasifier 28. The second multi-way valve 47 is adjusted so that the fourth pipeline 34 communicates with the second pyrolysis gasifier 28 through the second multi-way valve 47, and the first pyrolysis gasifier 27 is not communicated.

[0126] When the molten salt introduced into the second pyrolysis gasifier 28 reaches the pyrolysis liquid level, the flow regulating valve 42 on the fourth pipeline 34 is opened. The rotating speed of the regulating pump 43 and the opening degree of the flow regulating valve 42 on the fourth pipeline 34 are adjusted so that the pyrolysis liquid level and the pyrolysis temperature for pyrolyzing the biomass in the second pyrolysis gasifier 28 are maintained. Then, the on-off valve 45 on the eighth pipeline 38 on the first pyrolysis gasifier 27 of the second pyrolysis gasifier 28 is opened. The first pyrolysis gasifier 27 and the second pyrolysis gasifier 28 are alternately operated in turn.

[0127] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0128] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly and specifically limited.

[0129] In the present application, unless specifically defined otherwise, the terms "mounting", "connected", "connecting", "fixed", "fixedly connected", "connection", "fixedly connected", "connected", "fixed", and the like should be construed broadly, for example, can be fixed connection, can be detachable connection, or integral; can be mechanical connection, can be electrical connection or communication with each other; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0130] In the present application, unless specifically defined otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0131] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in the specification and the features of different embodiments or examples without contradiction.

[0132] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and cannot be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A biomass pyrolysis coupled with a thermal power generation system, characterized in that, The biomass pyrolysis gasification reaction device comprises a plurality of pyrolysis gasification furnaces, each of which has a molten salt inlet, a molten salt outlet, a synthetic gas outlet and a material port, and the pyrolysis gasification furnaces pyrolyze biomass raw materials in the pyrolysis gasification furnaces by using molten salt, and the pyrolysis gas produced by the pyrolysis gasification furnaces can be discharged from the synthetic gas outlet. The molten salt storage tank is connected with the molten salt outlet of each pyrolysis gasification furnace through an inlet, and the molten salt storage tank is connected with the molten salt inlet of each pyrolysis gasification furnace through an outlet and a first pipeline. The thermal power generation device comprises a boiler, a steam turbine and a generator, and the steam discharged from the boiler can enter the steam turbine so that the steam turbine drives the generator to generate electricity. The heating part comprises at least one heat exchanger arranged in the first pipeline to heat the molten salt in the first pipeline, and the heat source of the heat exchanger is at least one of the flue gas discharged from the boiler, the steam discharged from the boiler and the steam discharged from the steam turbine. The heating part comprises 2. The biomass pyrolysis integrated with power generation system according to claim 1, wherein, The first heat exchanger, and the heat source of the first heat exchanger is the steam discharged from at least one of the boiler and the steam turbine; The second heat exchanger, and the heat source of the second heat exchanger is the flue gas discharged from the boiler.

3. The biomass pyrolysis coupled thermal power generation system according to claim 2, wherein The heating part comprises a third heat exchanger, and the third heat exchanger uses electric energy to heat the molten salt in the first pipeline; The first heat exchanger, the second heat exchanger and the third heat exchanger are arranged in the first pipeline in sequence in a direction away from the inlet of the first pipeline; The temperature of the molten salt discharged from the cold source outlet of the third heat exchanger is greater than or equal to 850℃.

4. The biomass pyrolysis coupled thermal power generation system according to claim 2, wherein The steam turbine comprises a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder; The main steam outlet of the boiler, the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder, a condenser, a steam pipeline and the steam inlet of the boiler are connected in sequence, and a heater is arranged on the steam pipeline; The reheated steam outlet of the boiler is connected with the medium-pressure cylinder; The heat source inlet of the first heat exchanger is connected with the main steam outlet of the boiler through a first steam extraction pipeline, and / or the heat source inlet of the first heat exchanger is connected with the reheated steam outlet of the boiler through a second steam extraction pipeline; The heat source outlet of the first heat exchanger is connected with the inlet of the heater on the steam pipeline; The heat source inlet of the second heat exchanger is connected with the first flue gas outlet of the flue duct of the boiler, and the heat source outlet of the second heat exchanger is connected with the flue duct through an exhaust gas pipeline.

5. The biomass pyrolysis coupled thermal power generation system according to claim 4, wherein The temperature of the molten salt discharged from the cold source outlet of the first heat exchanger is greater than or equal to 450℃ and less than or equal to 500℃; The temperature of the molten salt discharged from the cold source outlet of the second heat exchanger is greater than or equal to 700℃ and less than or equal to 750℃. ​ The first flue gas outlet is located between the furnace outlet of the boiler and the location of the economizer in the flue in the extension direction of the flue, and the exhaust duct is provided with a dryer and an induced draft fan; The heater on the steam pipeline comprises a low-pressure heater, a deaerator and a high-pressure heater, and the heat source outlet of the first heat exchanger is connected with the inlet of the high-pressure heater.

6. The biomass pyrolysis integrated power generation system according to any one of claims 2-5, wherein, A plurality of the pyrolysis gasifiers comprises a plurality of pyrolysis groups, each of the pyrolysis groups comprises at least one of the pyrolysis gasifiers, and the plurality of the pyrolysis groups are communicated with the first pipeline in turn so that the plurality of the pyrolysis groups pyrolyze the biomass in turn.

7. The biomass pyrolysis coupled thermal power generation system according to claim 6, wherein, Each of the molten salt inlets is provided with a second pipeline, and the outlet of the first pipeline is connected with the inlets of the plurality of the second pipelines through a first multi-way valve; Each of the molten salt outlets is provided with a third pipeline, the inlet of the molten salt storage tank is provided with a fourth pipeline, the inlet of the fourth pipeline is connected with the outlets of the plurality of the third pipelines through a second multi-way valve, and the fourth pipeline is provided with a flow regulating valve; The outlet of the molten salt storage tank is connected with the first pipeline through a fifth pipeline, the fifth pipeline is provided with a regulating pump, the regulating pump is interlocked with a thermometer in the pyrolysis gasifier, and the regulating pump can adjust the rotating speed according to the temperature in the pyrolysis gasifier; Each of the syngas outlets is provided with an eighth pipeline, and the eighth pipeline is provided with an on-off valve.

8. The biomass pyrolysis coupled thermal power generation system according to claim 7, wherein, The molten salt storage tank is provided with a breather valve; The fifth pipeline is provided with a bypass pipeline, the inlet and the outlet of the bypass pipeline are connected with the fifth pipeline, the inlet of the bypass pipeline is located between the regulating pump and the outlet of the fifth pipeline in the extension direction of the fifth pipeline, the outlet of the bypass pipeline is located between the regulating pump and the inlet of the fifth pipeline in the extension direction of the fifth pipeline, the bypass pipeline is provided with a bypass valve for regulating the flow of the bypass pipeline; The outlet of the first pipeline is communicated with the molten salt storage tank through a backflow pipeline, and the backflow pipeline is provided with a backflow valve for regulating the flow of the backflow pipeline; The bypass valve and the backflow valve are interlocked, and when the opening of one of the bypass valve and the backflow valve is increased, the opening of the other one is decreased; The outlet of the eighth pipeline is connected with the gas inlet of the boiler through a gas pipeline, and the gas pipeline is provided with a gas control valve.

9. The biomass pyrolysis coupled thermal power generation system according to claim 8, wherein, When it is needed to increase the power generation of the thermal power plant, the amount of steam introduced into the first heat exchanger from the boiler is reduced; When it is needed to reduce the power generation of the thermal power plant, the amount of steam introduced into the first heat exchanger from the boiler is increased; When it is needed to maintain the minimum stable combustion load of the thermal power plant, the boiler stops introducing steam into the first heat exchanger.

10. The biomass pyrolysis coupled thermal power generation system according to claim 9, wherein, When it is required to increase the power generation of the thermal power plant, the amount of steam from the boiler to the first heat exchanger is reduced so that the amount of steam to the first heat exchanger is 50% of the rated load, the backflow valve is closed and the bypass valve is opened; When it is required to reduce the power generation of the thermal power plant, the amount of steam from the boiler to the first heat exchanger is increased so that the amount of steam to the first heat exchanger is 120% of the rated load, the backflow valve is opened and the bypass valve is closed; When it is required to maintain the minimum stable combustion load of the thermal power plant, the backflow valve is closed and the bypass valve is opened.

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