Pyrolysis power generation integrated system and method of use

Abstract

The application discloses a pyrolysis power generation integrated system and a use method, a coal mill is communicated with a reactor, the reactor is communicated with a carbon burner, the reactor is communicated with a pulverized coke buffer bin, the pulverized coke buffer bin is communicated with a CFB boiler through a boiler feeding device, an air duct burner is communicated with the CFB boiler, the carbon burner is communicated with the boiler feeding device and the air duct burner, the CFB boiler is provided with a flue gas outlet pipeline, and the flue gas outlet pipeline is communicated with the coal mill through a flue gas circulation pipeline.The reactor is communicated with the CFB boiler, the complete utilization of high-temperature pulverized coke sensible heat is realized, flue gas after desulfurization and denitrification in the CFB boiler is extracted and transported to the coal mill as a drying medium of a coal drying system, and an inert gas generator system is saved.The carbon burner is communicated with the CFB boiler, high-temperature flue gas is discharged to a flue gas purification system relying on the power generation CFB boiler to realize the heat energy utilization and purification treatment of the flue gas.

Description

Technical Field

[0001] This invention belongs to the field of coal quality differentiation and utilization technology, specifically relating to an integrated pyrolysis power generation system and its usage method. Background Technology

[0002] Existing pyrolysis and power generation technologies each have their own mature processes. However, conventional pyrolysis and power generation systems are relatively independent, with high investment costs and poor economic efficiency.

[0003] Patent application CN107163961A, entitled "Pyrolysis Coupled Power Generation System and its Pyrolysis Method," describes a pyrolysis coupled power generation system comprising: a pyrolysis reactor with a first inlet and a second inlet; a pyrolysis furnace body; heating pipes; a mixing component including multiple mixing furnace bodies and multiple mixers, the mixing furnace bodies being located below and connected to the pyrolysis furnace body, and the mixers used to mix materials within the furnace body; a gas-solid separation device connected to the pyrolysis reactor; a combustion device connected to the pyrolysis reactor and the gas-solid separation device to collect solid products and dust formed after pyrolysis for combustion to generate electricity; and a gas-liquid separation device connected to the gas-solid separation device. This patent application can reduce system energy consumption and operating costs, and improve the yield of pyrolysis tar and the quality of pyrolysis oil and gas. However, this patent application cannot solve the problems of effective utilization of high-temperature pulverized coke, effective utilization of flue gas after desulfurization and denitrification, and saving on waste heat boilers and flue gas purification devices in the pyrolysis process. Summary of the Invention

[0004] In order to overcome the problems existing in the prior art, the purpose of this invention is to provide an integrated pyrolysis power generation system and its usage method. Through system integration and optimization, the pyrolysis system and the power generation system are coupled together, reducing costs while improving energy utilization and reducing the overall energy consumption of the system.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A pyrolysis-power generation integrated system, comprising:

[0007] A coal milling and drying module, which includes a coal mill;

[0008] The reaction charcoal-burning module includes a reactor and a charcoal burner;

[0009] CFB boiler module, which includes CFB boiler, coke buffer bin, air duct burner and economizer;

[0010] The coal mill is connected to the reactor, the reactor is connected to the coke burner, and the reactor is also connected to a coke buffer silo. The coke buffer silo is connected to the CFB boiler via a boiler feeding device, and the air duct burner is connected to the CFB boiler. The coke burner is connected to the CFB boiler via a smoke-coal mixer, the coke burner is connected to the boiler feeding device, and the coke burner is connected to the air duct burner. The CFB boiler is equipped with a flue gas outlet pipe, the economizer is installed on the flue gas outlet pipe, and the flue gas outlet pipe is connected to the coal mill via a flue gas circulation pipe.

[0011] Optionally, a coal feeder is provided next to the coal mill, which can deliver raw materials into the coal mill, and the coal feeder is connected to a raw coal bunker.

[0012] Optionally, the pyrolysis power generation integrated system further includes a gas circulation pipeline, one end of which is connected to a booster fan, and the other end is connected to the reactor.

[0013] Optionally, the reactor is connected to a fractionation tower, the fractionation tower is connected to the booster fan via a pipeline, the booster fan is connected to a gas product pipeline via the gas circulation pipeline, and the fractionation tower is connected to a tar product pipeline.

[0014] Optionally, the coal grinding and drying module further includes a raw material collection tank, which is connected to the coal mill. The raw material collection tank is connected to a metering buffer tank, which is connected to the gas circulation pipeline. The charcoal burner is connected to the gas circulation pipeline.

[0015] Optionally, the raw material collection tank is connected to a bag filter, the bag filter is connected to a flue gas circulation fan, and the outlet of the flue gas circulation fan is provided with two branch pipes, one of which is connected to the flue gas circulation pipe and the other is connected to the exhaust outlet pipe.

[0016] Optionally, the bag filter is connected to an impeller feeder, and the other end of the impeller feeder is connected to the tobacco powder mixer.

[0017] Optionally, the charcoal burner is connected to a flue gas turbine, and the flue gas turbine is connected to a main fan via a drive shaft. The main fan is connected to the charcoal burner, and the outlet of the flue gas turbine is provided with two branch pipes. One branch pipe is connected to the flue gas mixer, and the other branch pipe is connected to two secondary branch pipes. One secondary branch pipe is connected to the air duct burner, and the other secondary branch pipe is connected to the boiler feeding device.

[0018] Optionally, the CFB boiler module also includes an air preheater, the duct burner is connected to the air side of the air preheater, the air side of the air preheater is connected to a primary air fan through a cold primary air duct, the flue gas outlet duct passes through the flue gas side of the air preheater and is connected to the purification system, the coal mill is connected to a sealing fan through a sealing duct, and the sealing duct is connected to the cold primary air duct.

[0019] A method of using an integrated pyrolysis power generation system includes the following steps:

[0020] S1: The raw coal is fed into a coal mill for grinding, and a drying medium is introduced into the coal mill;

[0021] S2: Nitrogen is used as the transport material to send raw coal to the reactor for pyrolysis. It is mixed with the heat carrier from the charcoal burner and then fed into the reactor for pyrolysis.

[0022] S3: The coke powder is separated from the oil and gas through the reactor. A portion of the coke powder flows into the charcoal burner for further combustion and is circulated back to the reactor as a heat carrier. The remaining coke powder flows into the CFB boiler through the coke powder buffer bin.

[0023] S4: The high-temperature and high-pressure flue gas generated by the charcoal burner is introduced into the CFB boiler in three ways; the first way is introduced into the CFB boiler from the charcoal burner through the boiler feeding device; the second way is to feed non-pyrolytic fine coal powder into the CFB boiler through the flue gas mixer; and the third way is introduced into the air duct burner to replace part of the primary air.

[0024] S5: The flue gas in the CFB boiler is discharged through the flue gas outlet pipe, and the waste heat is absorbed by the economizer on the flue gas outlet pipe.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] Given the wide range of fuel adaptability and pre-furnace feeding characteristics of CFB boilers, the reactor of the pyrolysis-power generation integrated system of this invention is connected to the CFB boiler. This allows the high-temperature pulverized coke, a byproduct of pyrolysis, to flow uniformly into the CFB boiler by gravity for combustion, achieving complete utilization of the sensible heat of the high-temperature pulverized coke and avoiding the risks associated with immature high-temperature pulverized coke conveying technology. Simultaneously, a pulverized coke buffer silo is installed to prevent fluctuations in the pyrolysis unit from affecting the safe and stable operation of the boiler. This eliminates the need for conventional pulverized coke cooling, storage, and conveying systems, reducing investment and operating costs and improving overall economic efficiency. Considering the environmentally friendly characteristics of CFB boilers, the flue gas, after desulfurization and denitrification within the CFB boiler, is extracted and transported to the coal mill through a flue gas circulation pipeline as a drying medium for the coal mill drying system. This results in higher flue gas quality and prevents corrosion of the coal mill drying system. This eliminates the need for an inert gas generator system, further reducing investment and operating costs. Conventional pyrolysis and power generation devices are equipped with their own boilers and flue gas purification systems. This invention integrates the pyrolysis and power generation system, connecting the charcoal burner to the CFB boiler. The generated high-temperature flue gas can be discharged to the matching flue gas purification system through the power generation CFB boiler to realize the thermal energy utilization and purification of the flue gas, eliminating the need for waste heat boilers and flue gas purification devices in conventional pyrolysis processes.

[0027] Furthermore, the present invention first guides the high-temperature and high-pressure flue gas generated by the charcoal burner to the flue gas turbine to drive the main fan, thereby realizing the utilization of pressure energy.

[0028] Furthermore, the present invention introduces the high-temperature flue gas after it has been powered by the flue gas turbine into the boiler feeding device so that the dispersed coke powder evenly covers the furnace, ensuring the uniformity of combustion in the furnace. The high-temperature flue gas is also fed into the CFB boiler through the flue gas-coke mixer to ensure the full utilization of coal.

[0029] Furthermore, the present invention connects the coal gas and tar generated by the pyrolysis reaction to the tar product pipeline and the coal gas product pipeline respectively through a fractionation tower, which can be further processed into high value-added products.

[0030] Furthermore, this invention connects the pipeline between the coal mill and the sealing fan to the cold primary air pipeline, enabling the coal mill to use the cold primary air from the CFB boiler for sealing air. During start-up, the sealing air for the coal mill is provided by the sealing fan. Multiple coal mills only require one sealing fan, reducing the required number of sealing fans. Attached Figure Description

[0031] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely schematic to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. In the drawings:

[0032] Figure 1 This is a diagram of the integrated pyrolysis power generation system of the present invention.

[0033] Among them: 1-Coal mill drying module, 11-Raw coal bunker, 12-Coal feeder, 13-Coal mill, 14-Raw material collection tank, 15-Metering buffer tank, 16-Bag filter, 17-Sealing fan, 2-Reaction charcoal burning module, 21-Reactor, 22-Charcoal burner, 23-Fracturing tower, 24-Booster fan, 25-Flue gas turbine, 26-Main fan, 3-CFB boiler module, 31-CFB boiler, 32-Powdered coke buffer silo, 33-Primary air fan, 34-Flue gas circulation fan, 35-Air preheater, 36-Duct burner, 37-Economizer. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0035] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0037] The present invention will now be described in detail with reference to the accompanying drawings.

[0038] See Figure 1 The present invention provides an integrated pyrolysis power generation system, comprising a pyrolysis coal milling and drying module 1, a reaction charcoal burning module 2, and a CFB boiler module 3, wherein the reaction charcoal burning module 2 is disposed between the pyrolysis coal milling and drying module 1 and the CFB boiler module 3.

[0039] The coal milling and drying module 1 includes: a raw coal bunker 11, a coal feeder 12, a coal mill 13, a raw material collection tank 14, a metering buffer tank 15, a bag filter 16, and a sealing fan 17.

[0040] The reaction charcoal burning module 2 includes: reactor 21, charcoal burner 22, distillation tower 23, booster fan 24, flue gas turbine 25, and main fan 26.

[0041] CFB boiler module 3 includes: CFB boiler 31, coke buffer bin 32, primary air fan 33, flue gas recirculation fan 34, air preheater 35, duct burner 36, and economizer 37.

[0042] The pyrolysis-powered integrated system of the present invention also includes a gas circulation pipeline, one end of which is connected to the booster fan 24, and the other end is connected to the bottom of the reactor 21. A gas product pipeline is connected to the other side of the gas circulation pipeline where it connects to the booster fan 24, for external delivery of the gas product.

[0043] The discharge port of the raw coal bunker 11 is located above the coal feeder 12, used to feed raw coal into the coal feeder 12. The discharge port of the coal feeder 12 is located above the top feed port of the coal mill 13, used to transport raw coal into the coal mill 13. Flue gas is introduced into the coal mill 13 as a drying medium to dry the raw coal. The top feed port of the coal mill 13 is connected to the raw material collection tank 14 via a pipeline.

[0044] The coal mill 13 has a side opening on its side, which is connected to the sealing fan 17 through a sealed pipe.

[0045] The raw material collection tank 14 is located on the side of the coal mill 13. The bottom of the raw material collection tank 14 is connected to the top of the metering buffer tank 15 via a pipe. The bottom of the metering buffer tank 15 is equipped with a bottom impeller feeder.

[0046] The bottom of the metering buffer tank 15 is connected to the gas circulation pipeline via a pipe.

[0047] The top of the raw material collection tank 14 is connected to the bag filter 16 via a pipe.

[0048] The bottom of the bag filter 16 is connected to an impeller feeder via a pipe, and the other end of the impeller feeder is connected to a dust mixer via a pipe. The dust mixer is connected to the middle of the CFB boiler 31 via a pipe.

[0049] The top of the reactor 21 is connected to the middle or upper part of the fractionation tower 23 via a pipe, and the top of the fractionation tower 23 is connected to the booster fan 24 via a pipe.

[0050] The bottom of the fractionation tower 23 is equipped with a tar product pipeline for external delivery of the tar product.

[0051] The lower part of the reactor 21 is connected to the charcoal burner 22 via a pipe, and the other side of the bottom of the reactor 21 is connected to the coke buffer chamber 32 via a pipe.

[0052] A cyclone separator is installed inside the reactor 21.

[0053] The bottom of the coke buffer silo 32 is connected to the boiler feeding device located at the bottom of the CFB boiler 31.

[0054] The top of the charcoal burner 22 is connected to the flue gas turbine 25 via a pipe. The flue gas turbine 25 is connected to the main fan 26 via a drive shaft. The outlet of the flue gas turbine 25 is provided with two branch pipes. One branch pipe is connected to the pulverized coal mixer, and the other branch pipe is further divided into two secondary branch pipes. One secondary branch pipe is connected to the air duct burner 36, and the other secondary branch pipe is divided into two tertiary branch pipes. Both tertiary branch pipes are connected to the boiler feeding device. One tertiary branch pipe is connected to the port of the boiler feeding device to provide a sealing function. The other tertiary branch pipe is connected to the boiler feeding device downstream in the flow direction at the connection between the pulverized coke buffer bin 32 and the boiler feeding device to increase disturbance and disperse the pulverized coke.

[0055] The main blower 26 is connected to the middle or bottom of the charcoal burner 22 via a pipe.

[0056] The bottom of the charcoal burner 22 is connected to the gas circulation pipe via a pipe.

[0057] The top of the CFB boiler 31 is provided with a flue gas outlet pipe, which passes through the flue gas side of the air preheater 35 and connects to the purification system. The economizer 37 is installed on the flue gas outlet pipe.

[0058] On the flue gas outlet pipe, the economizer 37 and the air preheater 35 are connected to the side port of the coal mill 13 through a flue gas circulation pipe.

[0059] The bottom of the CFB boiler 31 is connected to a duct burner 36, which is connected to the air side of the air preheater 35 via a pipe. The primary air fan 33 is connected to the air side of the air preheater 35 via a cold primary air duct.

[0060] The sealed pipe is connected to the cold primary air pipe.

[0061] The top of the bag filter 16 is connected to the inlet of the flue gas recirculation fan 34 via a pipe. The outlet of the flue gas recirculation fan 34 is provided with two branch pipes, one of which is connected to the flue gas recirculation pipe and the other is connected to the exhaust outlet pipe.

[0062] Example

[0063] See Figure 1 The pyrolysis-power generation integrated system of the present invention has the following pyrolysis process:

[0064] During startup, nitrogen gas is first introduced into the flue gas recirculation pipeline as the gas for transporting the pyrolysis feedstock. Raw coal is conveyed to the raw coal bunker 11 via a conveyor belt, and then enters the coal feeder 12 from the bottom of the bunker. The coal feeder 12 then transports the coal to the coal mill 13 for grinding. Since flue gas is introduced into the coal mill 13 as a drying medium, the raw coal is dried. The dried coal powder is then transported through a pipeline to the raw material collection tank 14 via the flue gas inside the coal mill 13. The pyrolysis feedstock in the raw material collection tank 14 is then sent through a pipeline to the metering buffer tank 15 for buffering. The raw material is then output from the metering buffer tank 15 by the impeller feeder at the bottom of the tank for weighing. The pressurized gas is then introduced into the raw material conveying pipeline through the pressurized gas recirculation pipeline via the booster fan 24, and mixed with the heat carrier from the charcoal burner 22 before entering the reactor 21 for pyrolysis.

[0065] After the raw materials and heat carrier undergo pyrolysis in reactor 21, coal chemical products are produced. These products are then rapidly separated from the oil and gas by a built-in cyclone separator in reactor 21.

[0066] Part of the coke is recycled into the coke burner 22 for further combustion and is circulated back to the reactor 21 as a heat carrier. The air required for combustion is provided by the main blower 26. Another part of the coke first passes through the coke buffer bin 32 and then flows into the CFB boiler 31 as fuel. This achieves full utilization of the sensible heat of the high-temperature coke and avoids the risks caused by the immaturity of the high-temperature coke conveying technology.

[0067] The oil and gas obtained from reactor 21 enters fractionation tower 23 for gas-liquid separation to obtain coal gas and tar. After being pressurized by booster fan 24, part of the coal gas is used as circulating coal gas and transported to reactor 21 as raw material, and part of the coal gas is sent to the downstream industrial chain; the tar is directly sent to the downstream industrial chain.

[0068] See Figure 1 The process flow of the coal grinding and drying medium in the pyrolysis power generation integrated system of the present invention is as follows:

[0069] Part of the flue gas that has undergone in-furnace desulfurization and denitrification is drawn from the pipeline between the economizer 37 and the air preheater 35 and fed into the coal mill 13 through the flue gas circulation pipeline. Using the desulfurized and denitrified flue gas as the drying medium for the coal mill drying system results in higher flue gas quality, prevents corrosion of the coal mill drying system, and eliminates the need for an inert gas generator system. The coal mill 13 dries the raw coal and conveys pulverized coal to the raw material collection tank 14. Most of the coarse pulverized coal is separated by a cyclone separator built into the raw material collection tank 14 and sent to a metering buffer tank 15 for pyrolysis. The remaining fine pulverized coal, which cannot be used for pyrolysis, is removed and collected with the flue gas through a bag filter 16. This collected pulverized coal is then fed into the CFB boiler 31 for power generation after the flue gas turbine 25 has performed work, serving as fuel. After being filtered by the bag filter 16, the flue gas is introduced into the flue gas circulation fan 34 and then divided into two paths: one path is connected to the flue gas side of the air preheater 35 and introduced into the purification system, and discharged after treatment to meet the standards; the other path is connected to the side port of the coal mill 13 through the flue gas circulation pipe to adjust the inlet flue gas temperature of the coal mill 13 to meet the inlet flue gas temperature requirements of the coal mill 13.

[0070] See Figure 1 The pyrolysis-power generation integrated system of this invention utilizes the following process for the exhaust gas energy of the charcoal burner 22: The high-temperature, high-pressure flue gas generated by the charcoal burner 22 is first guided to the flue gas turbine 25 to drive the main fan 26, thus utilizing pressure energy. The high-temperature flue gas, after being powered by the flue gas turbine 25, is introduced into the CFB boiler 31 via three paths. The first path enters the boiler feed device of the CFB boiler 31, distributing coke powder evenly to cover the furnace and ensuring uniform combustion. The second path delivers non-pyrolytic fine coal powder into the CFB boiler 31 through the flue gas mixer, ensuring complete utilization of the coal. The third path is introduced into the air duct burner 36 as bed fluidizing air, replacing part of the primary air. After entering the CFB boiler 31, the high-temperature flue gas's thermal energy is fully utilized, and it can be treated by the power plant boiler flue gas purification system to meet emission standards, eliminating the need for a waste heat boiler and flue gas purification device in conventional pyrolysis processes.

[0071] Unless otherwise specified, the equipment components involved in the above embodiments are all conventional equipment components, and the structural settings, working methods or control methods involved are all conventional settings, working methods or control methods in the art unless otherwise specified.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention, as long as they do not depart from the spirit and scope of the technical solutions of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. A pyrolysis-powered integrated system, characterized in that, include: Coal grinding and drying module (1), which includes a coal mill (13); The reaction charcoal-burning module (2) includes a reactor (21) and a charcoal burner (22); CFB boiler module (3), which includes CFB boiler (31), coke buffer bin (32), air duct burner (36) and economizer (37). The coal mill (13) is connected to the reactor (21), the reactor (21) is connected to the charcoal burner (22), and the reactor (21) is also connected to a coke buffer silo (32). The coke buffer silo (32) is connected to the CFB boiler (31) through a boiler feeding device, so that the high-temperature coke, a pyrolysis byproduct in the reactor (21), flows uniformly into the CFB boiler (31) by gravity for combustion. The air duct burner (36) is connected to the CFB boiler (31). The charcoal burner (22) is connected to the CFB boiler (31) through a smoke-powder mixer. The charcoal burner (22) is connected to the boiler feeding device, and the charcoal burner (22) is connected to the air duct burner (36). The top of the charcoal burner (22) is connected to a flue gas turbine (25) through a pipe. The outlet of the flue gas turbine (25) is provided with two branch pipes. One branch pipe is connected to the flue gas mixer, and the other branch pipe is further divided into two secondary branch pipes. One secondary branch pipe is connected to the air duct burner (36), and the other secondary branch pipe is divided into two tertiary branch pipes. Both tertiary branch pipes are connected to the boiler feeding device. One of the tertiary branch pipes is connected to the boiler feeding device. The port of the device is connected to the boiler feeder to provide a seal. Another third-level branch pipe is connected downstream of the coke buffer silo (32) and the boiler feeder in the direction of flow to increase disturbance and disperse the coke powder. The pyrolysis power generation integrated system also includes a gas circulation pipe. One end of the gas circulation pipe is connected to a booster fan, and the other end is connected to the reactor. The reactor is connected to a fractionation tower. The fractionation tower is connected to the booster fan through a pipe. The booster fan is connected to a gas product pipe through the gas circulation pipe. The fractionation tower is connected to a tar product pipe. The coal mill drying module also includes The system includes a raw material collection tank connected to the coal mill, a metering buffer tank connected to the raw material collection tank, a gas circulation pipeline connected to the raw material collection tank, a bag filter connected to the bag filter connected to an impeller feeder, the other end of the impeller feeder connected to the flue gas mixer, a flue gas outlet pipe provided with a CFB boiler (31), an economizer (37) provided on the flue gas outlet pipe, and the flue gas outlet pipe connected to the coal mill (13) through a flue gas circulation pipeline; the bottom of the charcoal burner (22) is connected to the gas circulation pipeline through a pipe.

2. The pyrolysis-power generation integrated system according to claim 1, characterized in that, A coal feeder (12) is provided next to the coal mill (13). The coal feeder (12) can deliver raw materials to the coal mill (13). The coal feeder (12) is connected to a raw coal bunker (11).

3. The pyrolysis-power generation integrated system according to claim 1, characterized in that, The coal grinding and drying module (1) also includes a raw material collection tank (14), which is connected to the coal mill (13). The raw material collection tank (14) is connected to a metering buffer tank (15), which is connected to the gas circulation pipeline. The charcoal burner (22) is connected to the gas circulation pipeline.

4. The pyrolysis-power generation integrated system according to claim 3, characterized in that, The raw material collection tank (14) is connected to a bag filter (16), and the bag filter (16) is connected to a flue gas circulation fan (34). The outlet of the flue gas circulation fan (34) is provided with two branch pipes, one of which is connected to the flue gas circulation pipe and the other is connected to the exhaust outlet pipe.

5. The pyrolysis-power generation integrated system according to claim 1, characterized in that, The charcoal burner (22) is connected to a flue gas turbine (25), and the flue gas turbine (25) is connected to a main fan (26) via a drive shaft. The main fan (26) is connected to the charcoal burner (22). The outlet of the flue gas turbine (25) is provided with two branch pipes. One branch pipe is connected to the flue gas mixer, and the other branch pipe is connected to two secondary branch pipes. One secondary branch pipe is connected to the air duct burner (36), and the other secondary branch pipe is connected to the boiler feeding device.

6. The pyrolysis-power generation integrated system according to claim 1, characterized in that, The CFB boiler module (3) also includes an air preheater (35), the duct burner (36) is connected to the air side of the air preheater (35), the air side of the air preheater (35) is connected to a primary air fan (33) through a cold primary air duct, the flue gas outlet duct passes through the flue gas side of the air preheater (35) and is connected to the purification system, the coal mill (13) is connected to a sealing fan (17) through a sealing duct, and the sealing duct is connected to the cold primary air duct.

7. A method of using an integrated pyrolysis power generation system according to any one of claims 1-6, characterized in that, Includes the following steps: S1: The raw coal is fed to the coal mill (13) for grinding, and a drying medium is introduced into the coal mill (13); S2: Using nitrogen as the transport material, the raw coal is sent to the reactor (21) for pyrolysis and mixed with the heat carrier from the charcoal burner (22) and then fed into the reactor (21) for pyrolysis. S3: The coke powder is separated from the oil and gas through the reactor (21). A portion of the coke powder flows into the charcoal burner (22) for further combustion and is circulated back to the reactor (21) as a heat carrier. The remaining coke powder flows into the CFB boiler (31) through the coke powder buffer bin (32). S4: The high-temperature and high-pressure flue gas generated by the charcoal burner (22) is introduced into the CFB boiler (31) in three ways; the first way is introduced into the CFB boiler (31) from the charcoal burner (22) through the boiler feeding device; the second way is to feed non-pyrolyzable fine coal powder into the CFB boiler (31) through the flue gas mixer. The third path introduces the air duct burner (36) to replace part of the primary air function; S5: The flue gas in the CFB boiler (31) is discharged through the flue gas outlet pipe and the waste heat is absorbed by the economizer (37) on the flue gas outlet pipe.

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