System and method for co-processing biomass and preparing formed biochar in coal-fired power plant

Abstract

The invention discloses a system and method for co-processing biomass and preparing formed biochar in a coal-fired power plant. A high-temperature flue gas connector and a medium-temperature flue gas connector are connected with a flue gas mother pipe, and an outlet of the flue gas mother pipe is connected with a flue gas inlet of a pretreatment system; an outlet of the pretreatment system is connected with an inlet of the integrated treatment system, an outlet of the integrated treatment system is connected with an inlet of the gas-solid separation system, and a gaseous outlet of the gas-solid separation system is connected with a hearth of the pulverized coal boiler through a fan and a burner; a solid outlet of the gas-solid separation system is connected with an inlet of the magnetic separation iron removal system; a non-metal material outlet of the magnetic separation iron removal system is connected with an inlet of the forming system, a metal material outlet of the magnetic separation iron removal system is connected with an inlet of the iron collection box, and the system and the method can be used for co-processing biomass and preparing formed biochar in a coal-fired power plant.

Description

Technical Field

[0001] The present invention belongs to the field of solid waste disposal, and relates to a system and method for collaboratively disposing biomass and preparing formed biochar in a coal-fired power plant. Background Art

[0002] Biomass, as the world's fourth largest energy source, has a two-way cleansing effect on energy and the environment, and is an ideal energy source that is consistent with sustainable development.

[0003] Converting biomass into biochar for comprehensive utilization is an effective way to improve the utilization rate of biomass. Biochar can also be compressed and molded into efficient and clean molded fuel, thereby improving the performance of biomass resources and increasing their value. Biochar compression molding technology can greatly improve the utilization rate of biomass resources and reduce the utilization rate of non-renewable resources.

[0004] Under the pressure of environmental pollution and resource shortage facing the world, the development of effective and economical biochar preparation and molding technology can not only reduce the environmental burden, but also realize the recycling of resources, which has important scientific value and social significance. The furnace temperature of coal-fired power plants can reach 1500℃, which can effectively decompose pollutants. They also have abundant heat, electricity and steam resources. Through technical transformation, they can use their own technical advantages and perfect environmental protection design to achieve clean and efficient preparation of biochar. Therefore, there is a good prospect for the coordinated disposal of biomass and the preparation of molded biochar in coal-fired power plants. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a system and method for the coordinated disposal of biomass and preparation of formed biochar in a coal-fired power plant. The system and method can coordinate the disposal of biomass and preparation of formed biochar in a coal-fired power plant.

[0006] To achieve the above-mentioned purpose, the present invention discloses a system for the coordinated disposal of biomass and preparation of formed biochar in a coal-fired power plant, including a biomass storage system, a pretreatment system, a pulverized coal boiler, a flue gas main pipe, an integrated treatment system, a gas-solid separation system, a pulverized coal boiler, a magnetic separation and iron removal system, an iron collection box and a forming system;

[0007] The outlet of the biomass storage system is connected to the material inlet of the pretreatment system; a high-temperature flue gas interface is arranged on the flue between the furnace outlet of the pulverized coal boiler and the economizer, and a medium-temperature flue gas interface is arranged on the economizer outlet flue of the pulverized coal boiler. The high-temperature flue gas interface and the medium-temperature flue gas interface are connected to the flue gas main pipe, and the outlet of the flue gas main pipe is connected to the flue gas inlet of the pretreatment system;

[0008] The outlet of the pretreatment system is connected to the inlet of the integrated treatment system, the outlet of the integrated treatment system is connected to the inlet of the gas-solid separation system, the gaseous outlet of the gas-solid separation system is connected to the furnace of the pulverized coal boiler via a fan and a burner; the solid outlet of the gas-solid separation system is connected to the inlet of the magnetic separation and iron removal system; the non-metallic material outlet of the magnetic separation and iron removal system is connected to the inlet of the forming system, and the metal material outlet of the magnetic separation and iron removal system is connected to the inlet of the iron collecting box.

[0009] Furthermore, the outlet of the biomass storage system is connected to the material inlet of the pretreatment system via the biomass crushing system and the feeding system in sequence.

[0010] Furthermore, a high-temperature stop valve and a high-temperature regulating valve are provided between the flue gas main pipe and the high-temperature flue gas interface.

[0011] Furthermore, a medium-temperature stop valve and a medium-temperature regulating valve are provided between the flue gas main pipe and the medium-temperature flue gas interface.

[0012] Furthermore, the fire steam interface of the fire steam manifold is connected to the fire steam main pipe, the fire steam main pipe is connected to the inlet of the steam fire extinguishing system, and the outlet of the steam fire extinguishing system is connected to the fire steam inlet of the pretreatment system and the fire steam inlet of the integrated treatment system.

[0013] Furthermore, a steam stop valve is provided on the fire steam main pipe.

[0014] Furthermore, a No. 1 steam regulating valve is provided at the outlet of the steam fire extinguishing system and the fire steam inlet of the pretreatment system.

[0015] Furthermore, a No. 2 steam regulating valve is provided at the outlet of the steam fire extinguishing system and the fire steam inlet of the integrated treatment system.

[0016] Furthermore, the solid outlet of the gas-solid separation system is connected to the inlet of the magnetic separation and iron removal system through the cooling system.

[0017] The present invention discloses a method for co-processing biomass and preparing formed biochar in a coal-fired power plant, comprising the following steps:

[0018] 1) The high-temperature flue gas of 600-700°C extracted from the high-temperature flue gas interface and the medium-temperature flue gas of 300-400°C extracted from the medium-temperature flue gas interface are mixed to form a mixed flue gas with a temperature of 550-600°C, and the mixed flue gas is sent to the pretreatment system through the flue gas main pipe;

[0019] 2) The biomass raw materials in the biomass storage system are sent to the pretreatment system, and the biomass materials and the mixed flue gas are pre-carbonized in the pretreatment system by indirect contact;

[0020] 3) The biochar particles, tar, flue gas and combustible gas outputted from the pretreatment system enter the integrated treatment system, where they are pyrolyzed, crushed, degreased, carbonized and transported;

[0021] 4) The output product of the integrated processing system enters the gas-solid separation system, and the gas-solid separation system separates the solid matter and gaseous matter in the product, wherein the separated gaseous product passes through the fan and the burner in turn into the furnace of the pulverized coal boiler for harmless incineration, and the separated solid matter passes through the magnetic separation and iron removal system to separate metal and non-metal, wherein the magnetically separated metal material enters the iron collection box for further recycling, and the non-metallic material enters the molding system to prepare molded biochar.

[0022] The present invention has the following beneficial effects:

[0023] The system and method for the coordinated disposal of biomass and preparation of formed biochar in a coal-fired power plant described in the present invention, during specific operation, pre-carbonizes the biomass raw materials through a pretreatment system, and then sends them into an integrated processing system for pyrolysis, crushing, oil removal, carbonization and transportation, and then separates them, wherein the separated gaseous products are sent to the furnace for combustion, and the separated solid substances are deironed, and then prepared into formed biochar through a forming system, thereby achieving the purpose of coordinated disposal of biomass and preparation of formed biochar in a coal-fired power plant, and the system is extremely practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 It is a structural diagram of the present invention.

[0026] Among them, 1 is a biomass storage system, 2 is a biomass crushing system, 3 is a feeding system, 4 is a pretreatment system, 5 is an integrated treatment system, 6 is a gas-solid separation system, 7 is a fan, 8 is a burner, 9 is a pulverized coal boiler, 10 is a high-temperature flue gas interface, 11 is a high-temperature stop valve, 12 is a high-temperature regulating valve, 13 is a medium-temperature flue gas interface, 14 is a medium-temperature stop valve, 15 is a medium-temperature regulating valve, 16 is a cooling system, 17 is a magnetic separation and iron removal system, 18 is a molding system, 19 is a fire steam manifold, 20 is a fire steam interface, 21 is a steam stop valve, 22 is a steam fire extinguishing system, 23 is No. 1 steam regulating valve, 24 is No. 2 steam regulating valve, and 25 is an iron collecting box. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0029] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0030] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0031] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0032] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0035] Embodiment 1

[0036] refer to Figure 1 The system for collaboratively treating biomass and preparing formed biochar in a coal-fired power plant of the present invention comprises a biomass storage system 1, a pretreatment system 4, a pulverized coal boiler 9, a flue gas main pipe, an integrated treatment system 5, a gas-solid separation system 6, a pulverized coal boiler 9, a magnetic separation and iron removal system 17, an iron collecting box 25 and a forming system 18; the outlet of the biomass storage system 1 is connected to the material inlet of the pretreatment system 4; a high-temperature flue gas interface 10 is arranged on the flue between the furnace outlet of the pulverized coal boiler 9 and the economizer, and a medium-temperature flue gas interface 13 is arranged on the economizer outlet flue of the pulverized coal boiler 9, and the high-temperature flue gas interface 10 and the medium-temperature flue gas interface 13 are arranged on the economizer outlet flue of the pulverized coal boiler 9. The gas interface 13 is connected to the flue gas main pipe, and the outlet of the flue gas main pipe is connected to the flue gas inlet of the pretreatment system 4; the outlet of the pretreatment system 4 is connected to the inlet of the integrated treatment system 5, and the outlet of the integrated treatment system 5 is connected to the inlet of the gas-solid separation system 6, and the gaseous outlet of the gas-solid separation system 6 is connected to the furnace of the pulverized coal boiler 9 via the fan 7 and the burner 8; the solid outlet of the gas-solid separation system 6 is connected to the inlet of the magnetic separation and iron removal system 17; the non-metallic material outlet of the magnetic separation and iron removal system 17 is connected to the inlet of the forming system 18, and the metal material outlet of the magnetic separation and iron removal system 17 is connected to the inlet of the iron collecting box 25.

[0037] The method for the coal-fired power plant to collaboratively dispose of biomass and prepare formed biochar according to the present invention comprises the following steps:

[0038] 1) The high-temperature flue gas of 600-700°C extracted from the high-temperature flue gas interface 10 and the medium-temperature flue gas of 300-400°C extracted from the medium-temperature flue gas interface 13 are mixed to form a mixed flue gas with a temperature of 550-600°C, and the mixed flue gas is sent to the pretreatment system 4 through the flue gas main pipe;

[0039] 2) The biomass raw materials in the biomass storage system 1 are sent to the pretreatment system 4, and the biomass materials and the mixed flue gas are pre-carbonized in the pretreatment system 4 by indirect contact;

[0040] 3) The biochar particles, tar, flue gas and combustible gas outputted from the pretreatment system 4 enter the integrated treatment system 5, where they are pyrolyzed, crushed, degreased, carbonized and transported;

[0041] 4) The product output by the integrated processing system 5 enters the gas-solid separation system 6, which separates the solid matter and gaseous matter in the product, wherein the separated gaseous product passes through the fan 7 and the burner 8 in turn into the furnace of the pulverized coal boiler 9 for harmless incineration, and the separated solid matter passes through the magnetic separation and iron removal system 17 to separate metals from non-metals, wherein the magnetically separated metal materials enter the iron collection box 25 for further recycling, and the non-metallic materials enter the molding system 18 to prepare molded biochar.

[0042] Embodiment 2

[0043] refer to Figure 1 The system for collaboratively disposing biomass and preparing formed biochar in a coal-fired power plant of the present invention comprises a biomass storage system 1, a biomass crushing system 2, a feeding system 3, a pretreatment system 4, an integrated treatment system 5, a gas-solid separation system 6, a fan 7, a burner 8, a pulverized coal boiler 9, a high-temperature flue gas interface 10, a high-temperature stop valve 11, a high-temperature regulating valve 12, a medium-temperature flue gas interface 13, a medium-temperature stop valve 14, a medium-temperature regulating valve 15, a cooling system 16, a magnetic separation and iron removal system 17, a forming system 18, a fire steam manifold 19, a fire steam interface 20, a steam stop valve 21, a steam fire extinguishing system 22, a No. 1 steam regulating valve 23, a No. 2 steam regulating valve 24 and an iron collecting box 25;

[0044] The outlet of the biomass storage system 1 is connected to the inlet of the biomass crushing system 2, the outlet of the biomass crushing system 2 is connected to the inlet of the feeding system 3, and the outlet of the feeding system 3 is connected to the material inlet of the pretreatment system 4; a high-temperature flue gas interface 10 is arranged on the flue between the furnace outlet of the pulverized coal boiler 9 and the economizer, and a medium-temperature flue gas interface 13 is arranged on the economizer outlet flue of the pulverized coal boiler 9. The high-temperature flue gas interface 10 and the medium-temperature flue gas interface 13 are connected to the flue gas main pipe, and a high-temperature stop valve 11 and a high-temperature regulating valve 12 are arranged between the flue gas main pipe and the high-temperature flue gas interface 10, and a medium-temperature stop valve 14 and a medium-temperature regulating valve 15 are arranged between the flue gas main pipe and the medium-temperature flue gas interface 13. The temperature regulating valve 15, the outlet of the smoke main pipe is connected to the smoke inlet of the pretreatment system 4; the fire steam interface 20 of the fire steam manifold 19 is connected to the fire steam main pipe, the fire steam main pipe is connected to the inlet of the steam fire extinguishing system 22, and a steam stop valve 21 is arranged on the fire steam main pipe; the outlet of the steam fire extinguishing system 22 is connected to the fire steam inlet of the pretreatment system 4 and the fire steam inlet of the integrated treatment system 5, and the outlet of the steam fire extinguishing system 22 and the fire steam inlet of the pretreatment system 4 are provided with a No. 1 steam regulating valve 23; the outlet of the steam fire extinguishing system 22 and the fire steam inlet of the integrated treatment system 5 are provided with a No. 2 steam regulating valve 24.

[0045] The outlet of the pretreatment system 4 is connected to the inlet of the integrated treatment system 5, the outlet of the integrated treatment system 5 is connected to the inlet of the gas-solid separation system 6, the gaseous outlet of the gas-solid separation system 6 is connected to the inlet of the fan 7, the outlet of the fan 7 is connected to the inlet of the burner 8, and the outlet of the burner 8 is connected to the furnace of the pulverized coal boiler 9; the solid outlet of the gas-solid separation system 6 is connected to the inlet of the cooling system 16, and the outlet of the cooling system 16 is connected to the inlet of the magnetic separation and iron removal system 17; the non-metallic material outlet of the magnetic separation and iron removal system 17 is connected to the inlet of the forming system 18, and the metal material outlet of the magnetic separation and iron removal system 17 is connected to the inlet of the iron collecting box 25.

[0046] The method for the coal-fired power plant to collaboratively dispose of biomass and prepare formed biochar according to the present invention comprises the following steps:

[0047] 1) The high-temperature flue gas of 600-700°C extracted from the high-temperature flue gas interface 10 and the medium-temperature flue gas of 300-400°C extracted from the medium-temperature flue gas interface 13 are mixed to form a mixed flue gas with a temperature of 550-600°C, wherein the extraction ratio of the high-temperature flue gas and the medium-temperature flue gas is controlled by adjusting the opening of the high-temperature regulating valve 12 and the medium-temperature regulating valve 15, and then the temperature of the mixed flue gas is controlled so that it can adapt to different types (physical properties) of biomass, and the mixed flue gas is sent to the pretreatment system 4 through the flue gas main pipe.

[0048] 2) The biomass raw materials in the biomass storage system 1 are sent to the biomass crushing system 2 to be crushed into granular materials of suitable sizes, and then sent to the pretreatment system 4 through the feeding system 3. The biomass materials and the mixed flue gas are pre-carbonized in the pretreatment system 4 by indirect contact. The main function is that different types (physical properties) of biomass can ensure the overall carbonization degree through different residence times in the pretreatment system 4.

[0049] 3) The biochar particles, tar, flue gas and combustible gas output by the pretreatment system 4 enter the integrated treatment system 5, where they are pyrolyzed, crushed, degreased, carbonized and transported. The integrated treatment system 5 is a key process for preparing biochar and recycling its by-products. The high-temperature flue gas provides an oxygen-deficient environment, which can not only dry, carbonize and pyrolyze biomass, but also convert the large molecular tar produced in the process into small molecular gas or solid.

[0050] 4) The product temperature at the outlet of the integrated processing system 5 is controlled at about 350°C, and enters the gas-solid separation system 6 through a closed pipeline. The gas-solid separation system 6 separates the solid matter and the gaseous matter in the product, wherein the separated gaseous product passes through the closed pipeline in sequence through the fan 7 and the burner 8 into the furnace of the pulverized coal boiler 9 for harmless incineration, and the pollutants generated by the incineration are efficiently removed by the original pollutant removal system at the tail of the pulverized coal boiler 9; the separated solid matter is cooled by the cooling system 16, and then passes through the magnetic separation and iron removal system 17 to separate metals from non-metals, wherein the magnetically separated metal materials enter the iron collection box 25 for further recycling, and the non-metallic materials (i.e., biochar) enter the molding system 18 to prepare molded biochar.

[0051] In addition, the present invention is provided with a steam fire extinguishing system 22. A fire steam interface 20 is provided at the fire steam manifold 19, which is connected to the steam fire extinguishing system 22 through a fire main pipe. The steam fire extinguishing system 22 is respectively connected to the pretreatment system 4 and the integrated treatment system 5. When a fire hazard occurs, fire steam extinguishing can be used to eliminate the hazard.

[0052] The present invention has the following characteristics:

[0053] The present invention extracts the high-temperature flue gas between the furnace outlet and the economizer of a coal-fired power plant and the medium-temperature flue gas at the economizer outlet, and determines the flue gas temperature at the inlet of the pretreatment system 4 and the temperature of the outlet product according to the different physical and chemical properties of the biomass. The pre-carbonized biochar particles, tar, flue gas, combustible gas, etc. enter the integrated treatment system 5, where they are pyrolyzed, crushed, degreased, carbonized and transported. Among them, the high-temperature flue gas provides an oxygen-deficient environment, and at the same time can not only dry, carbonize, and pyrolyze biomass, but also convert the macromolecular tar generated in the process into small molecular gas or solid. The gaseous product at the outlet of the integrated treatment system 5 enters the furnace of the pulverized coal boiler 9 for incineration disposal to improve the utilization rate, and the pollutants generated by the combustion of the waste gas in the pulverized coal furnace are removed by the tail pollutant removal facility.

[0054] The present invention adopts a combination of indirect and direct contact methods to pyrolyze and carbonize biomass, which can not only ensure the uninterrupted and continuous operation of the system, but also enhance the heat exchange efficiency, reduce energy consumption, and increase output.

[0055] The present invention is provided with a magnetic separation and iron removal system 17 and an iron collecting box 25, which not only ensures the quality of the biochar, but also can recycle and utilize metals such as iron, thus avoiding waste of resources.

[0056] The present invention sets up a molding system 18 separately, which can realize the preparation and molding of biochar at the same time, that is, improve the utilization rate of biomass, and compress and mold the biochar into efficient and clean molded fuel, thereby improving the use performance of biomass resources and enhancing its value. Coal-fired power plants are transformed from energy converters to energy producers and processors, making greater contributions to the development of the clean energy field.

[0057] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0058] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0059] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A system for co-processing biomass and preparing biochar in a coal-fired power plant, characterized in that: It comprises a biomass storage system (1), a pretreatment system (4), a pulverized coal boiler (9), a flue gas main pipe, an integrated treatment system (5), a gas-solid separation system (6), a pulverized coal boiler (9), a magnetic separation and iron removal system (17), an iron collecting box (25) and a molding system (18); The outlet of the biomass storage system (1) is connected to the material inlet of the pretreatment system (4); a high-temperature flue gas interface (10) is arranged on the flue between the furnace outlet of the pulverized coal boiler (9) and the economizer, and a medium-temperature flue gas interface (13) is arranged on the economizer outlet flue of the pulverized coal boiler (9); the high-temperature flue gas interface (10) and the medium-temperature flue gas interface (13) are connected to the flue gas main pipe, and the outlet of the flue gas main pipe is connected to the flue gas inlet of the pretreatment system (4); The outlet of the pretreatment system (4) is connected to the inlet of the integrated treatment system (5), the outlet of the integrated treatment system (5) is connected to the inlet of the gas-solid separation system (6), the gaseous outlet of the gas-solid separation system (6) is connected to the furnace of the pulverized coal boiler (9) via the fan (7) and the burner (8); the solid outlet of the gas-solid separation system (6) is connected to the inlet of the magnetic separation and iron removal system (17); the non-metallic material outlet of the magnetic separation and iron removal system (17) is connected to the inlet of the molding system (18), and the metal material outlet of the magnetic separation and iron removal system (17) is connected to the inlet of the iron collecting box (25).

2. The system for co-processing biomass and preparing formed biochar in a coal-fired power plant according to claim 1, characterized in that: The outlet of the biomass storage system (1) is connected to the material inlet of the pretreatment system (4) via the biomass crushing system (2) and the feeding system (3) in sequence.

3. The system for co-processing biomass and preparing formed biochar in a coal-fired power plant according to claim 1, characterized in that: A high-temperature stop valve (11) and a high-temperature regulating valve (12) are provided between the flue gas main pipe and the high-temperature flue gas interface (10).

4. The system for co-processing biomass and preparing formed biochar in a coal-fired power plant according to claim 1, characterized in that: A medium-temperature stop valve (14) and a medium-temperature regulating valve (15) are provided between the flue gas main pipe and the medium-temperature flue gas interface (13).

5. The system for co-processing biomass and preparing formed biochar in a coal-fired power plant according to claim 1, characterized in that: The fire steam interface (20) of the fire steam header (19) is connected to the fire steam main pipe, the fire steam main pipe is connected to the inlet of the steam fire extinguishing system (22), and the outlet of the steam fire extinguishing system (22) is connected to the fire steam inlet of the pretreatment system (4) and the fire steam inlet of the integrated treatment system (5).

6. The system for co-processing biomass and preparing formed biochar in a coal-fired power plant according to claim 5, characterized in that: A steam stop valve (21) is provided on the fire steam main pipe.

7. The system for co-processing biomass and preparing formed biochar in a coal-fired power plant according to claim 5, characterized in that: A No. 1 steam regulating valve (23) is provided between the outlet of the steam fire extinguishing system (22) and the fire steam inlet of the pretreatment system (4).

8. The system for co-processing biomass and preparing formed biochar in a coal-fired power plant according to claim 5, characterized in that: The outlet of the steam fire extinguishing system (22) and the fire steam inlet of the integrated processing system (5) are provided with a No. 2 steam regulating valve (24).

9. The system for co-processing biomass and preparing formed biochar in a coal-fired power plant according to claim 1, characterized in that: The solid outlet of the gas-solid separation system (6) is connected to the inlet of the magnetic separation and iron removal system (17) via the cooling system (16).

10. A method for co-processing biomass and preparing formed biochar in a coal-fired power plant, characterized in that: The system for co-processing biomass and preparing formed biochar in a coal-fired power plant according to claim 1 comprises the following steps: 1) The high-temperature flue gas of 600-700° C. extracted from the high-temperature flue gas interface (10) and the medium-temperature flue gas of 300-400° C. extracted from the medium-temperature flue gas interface (13) are mixed to form a mixed flue gas with a temperature of 550-600° C., and the mixed flue gas is sent to the pretreatment system (4) through the flue gas main pipe; 2) The biomass raw materials in the biomass storage system (1) are sent to the pretreatment system (4), and the biomass materials and the mixed flue gas are pre-carbonized in the pretreatment system (4) by indirect contact; 3) The biochar particles, tar, flue gas and combustible gas outputted from the pretreatment system (4) enter the integrated treatment system (5), where they are pyrolyzed, crushed, degreased, carbonized and transported; 4) The product output by the integrated processing system (5) enters the gas-solid separation system (6), and the gas-solid separation system (6) separates the solid matter and the gaseous matter in the product, wherein the separated gaseous product passes through the fan (7) and the burner (8) in turn and enters the furnace of the pulverized coal boiler (9) for harmless incineration, and the separated solid matter passes through the magnetic separation and iron removal system (17) to separate metal and non-metal, wherein the magnetically separated metal material enters the iron collection box (25) for further recycling, and the non-metal material enters the molding system (18) to prepare molded biochar.

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