Integrated production of electricity and carbon from shells

Abstract

The present application provides a kind of fruit shell electric carbon co-production method and device, wherein the method includes that biomass fruit shell raw material is pretreated, and is sent into stove front biomass bin temporary storage;Pretreated fruit shell raw material is sent into carbonization furnace in the lower part of biomass fuel steam carbon coupling boiler by screw feeder, and generates crude activated carbon and volatile biomass gas by preset processing process;The volatile biomass gas enters the gas boiler in the upper part of biomass fuel steam carbon coupling boiler after passing through biomass gas production and carbonization adjusting device, heats the gas boiler and generates high-temperature high-pressure steam;The high-temperature high-pressure steam is divided into two ways, one way is sent into steam turbine to drive generator to generate electricity, and the electric energy generated by the generator is connected to power grid after passing through transformer;The other way is sent into activated carbon activation reaction kettle as activation medium, and the crude activated carbon is activated to obtain target activated carbon. The above application can realize the efficient co-production of continuous production of activated carbon and high-temperature steam power generation.

Description

Technical Field

[0001] This invention relates to the field of biomass energy utilization and environmental protection technology, specifically to a method and apparatus for cogeneration of carbon from fruit shells. Background Technology

[0003] In existing technologies, activated carbon production and biomass energy utilization typically employ a separate process: activated carbon production companies collect and store the biomass gas generated during the carbonization process, and then transport it to power generation companies via pipelines or tank trucks for combustion and power generation. This process has the following significant drawbacks: biomass gas is subject to leakage losses during storage and transportation, and the transportation process requires additional power, resulting in low overall energy utilization efficiency; furthermore, separate biomass gas storage tank areas and transportation pipelines need to be constructed, leading to high investment costs. Additionally, since the steam required for activated carbon activation usually needs to be purchased externally, steam costs also account for a significant proportion of the activated carbon production cost.

[0004] Furthermore, traditional fixed-bed carbonization furnaces are mostly intermittent in operation, resulting in long production cycles per furnace, high labor intensity, and poor product quality stability. Traditional flue gas desulfurization often employs wet processes, generating large amounts of desulfurization wastewater that requires the construction of wastewater treatment systems, further increasing operating costs and environmental risks. In addition, although some research has attempted to combine carbonization with combustion, these efforts often suffer from low coupling between the two processes, poor temperature control precision, and inadequate activated carbon activation, making it impossible to achieve continuous and stable industrial-scale production.

[0005] Therefore, developing an efficient, environmentally friendly, and low-cost integrated process for cogeneration of carbon from fruit shells is of great practical significance. Summary of the Invention

[0006] The purpose of this invention is to provide a method and apparatus for cogeneration of activated carbon from fruit shells, which solves the technical problems in the prior art, such as low energy utilization rate, high production cost, inability of carbonization furnace to produce continuously, high cost of purchasing activation steam, and wastewater generation from traditional flue gas treatment, caused by the separation of activated carbon production and energy utilization.

[0007] The method for cogeneration of biomass shells into electricity and carbon provided by the present invention includes: pre-treating the biomass shell raw material and then temporarily storing it in a pre-furnace biomass silo. The pre-treated nutshell raw material is fed into the carbonization furnace at the bottom of the biomass fuel gas-carbon coupling boiler via a screw feeder, and crude activated carbon and volatile biomass gas are generated through a preset treatment process; The volatile biomass gas enters the gas boiler at the top of the biomass fuel gas-carbon coupling boiler after passing through the biomass gas production and carbonization regulating device, heating the gas boiler and generating high-temperature and high-pressure steam. The high-temperature and high-pressure steam is divided into two paths. One path is sent to a steam turbine to drive a generator to generate electricity. The electricity generated by the generator is then connected to the power grid after passing through a transformer. The other path is sent to an activated carbon activation reactor as an activation medium to activate the crude activated carbon and obtain the target activated carbon. The tail flue gas of the biomass fuel gas-carbon coupled boiler is treated sequentially by a desulfurization device and a bag filter, and then discharged through a chimney after meeting the standards.

[0008] In addition, an optional technical solution is that the pretreatment includes: crushing the fruit shell raw material to a particle diameter of 10~30cm; The preset processing technology includes: moving the fruit shell raw material with the grate in an oxygen-limited environment, and sequentially passing it through a drying section at 150~250℃, a surface carbonization section at 350~450℃, and a deep carbonization section at 450~650℃ to generate the crude activated carbon and the volatile biomass gas.

[0009] In addition, an optional technical solution is that the grate is cooled by cold air, and short-circuit regulating devices are installed on both sides of the air inlet of the grate to control the surface temperature of the grate to ≤150℃. The cooled hot air is sent to the combustion chamber of the gas boiler through a bypass to participate in combustion.

[0010] In addition, an alternative technical solution is to control the oxygen limit, carbonization reaction rate, and volatile biomass gas production in the carbonization furnace by adjusting the opening degree of the biomass gas production and carbonization regulating device and the running speed of the grate.

[0011] In addition, an optional technical solution is that the steam pressure in the activation reactor is in the range of 0.8~2.5MPa, the temperature is in the range of 180~350℃, and the activation time is 60~120min; The target activated carbon is cooled to below 60°C by a second water-cooled screw conveyor before being loaded and transported.

[0012] In addition, an optional technical solution is that the fruit shell raw material includes any one or more combinations of coconut shells, walnut shells, apricot shells, peanut shells, wood scraps, and bamboo shavings.

[0013] On the other hand, the present invention also provides a fruit shell cogeneration device for realizing the above-mentioned fruit shell cogeneration method, the device comprising a biomass feeding system, a biomass fuel steam-carbon coupling boiler, an activated carbon activation system, a steam power generation system, and a flue gas purification system connected in sequence; wherein... The biomass fuel gas-carbon coupling boiler has an integrated structure, with a grate-type carbonization furnace at the bottom and a gas-fired boiler at the top. The feed inlet of the carbonization furnace is connected to the biomass feeding system, and the discharge outlet is connected to the first water-cooled screw conveyor. A biomass gas production and carbonization regulation device is provided on the upper side wall of the carbonization furnace. The gas outlet of the biomass gas production and carbonization regulation device is directly connected to the combustion zone of the gas-fired boiler. The steam outlet of the gas-fired boiler is connected to the steam power generation system and the activated carbon activation system, respectively. The flue gas purification system includes a semi-dry desulfurization device, a bag filter, a boiler induced draft fan, and a chimney connected in sequence. The air inlet of the desulfurization device is connected to the tail flue of the biomass fuel gas-carbon coupled boiler.

[0014] In addition, an optional technical solution is that the biomass feeding system includes a biomass feeding device, a pre-furnace biomass bin, and a screw feeder connected in sequence; Both the feed inlet and discharge outlet of the carbonization furnace are equipped with sealing regulating gates, which, together with the biomass gasification and carbonization regulating device, form a closed oxygen-limiting system.

[0015] In addition, an optional technical solution is that the steam power generation system includes a steam turbine, a generator and a main transformer connected in sequence, and the output end of the main transformer is connected to the power grid; The activated carbon activation system includes an activation reactor and the first water-cooled spiral conveyor. The feed inlet of the activation reactor is connected to the first water-cooled spiral conveyor, and the steam inlet of the activation reactor is connected to the steam outlet of the biomass fuel gas-carbon coupling boiler. The outlet of the activation reactor is connected to a second water-cooled spiral conveyor, which is used for loading and transportation. The biomass fuel gas-carbon coupled boiler is also equipped with at least two boiler electric feedwater pumps; the bottom of the grate is equipped with an air-cooled air intake system, which is connected to the bypass flue to the combustion chamber of the gas boiler.

[0016] In addition, optional technical solutions include a PLC automatic control system and an online flue gas monitoring device; among which, The PLC automatic control system is electrically connected to the drive device of the grate, the electric actuator of the biomass gas production and carbonization adjustment device, the steam regulating valve, and the flue gas online monitoring device to monitor and automatically adjust the carbonization temperature, grate speed, steam parameters, and flue gas emissions in real time.

[0017] According to the above-mentioned fruit shell cogeneration method and apparatus provided by the present invention, an integrated biomass fuel gas-carbon coupling boiler is adopted, which allows the fruit shell raw materials to be directly burned and utilized in the boiler, eliminating losses in the storage and transportation process, improving energy utilization efficiency, and at the same time, it can dispose of agricultural and forestry waste, reduce environmental pollution caused by straw burning, and meet environmental protection emission requirements.

[0018] To achieve the above and related objectives, the present invention will be described in conjunction with the following specific technical features. Exemplary embodiments of the present invention are described in detail below and in the accompanying drawings, but these are only one of many possible ways to apply the principles of the present invention. Furthermore, the present invention aims to cover all such embodiments and their equivalents. Attached Figure Description

[0019] Figure 1 This is a flowchart of the fruit shell co-generation method according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the fruit shell cogeneration device according to an embodiment of the present invention; Figure 3 This is a partially enlarged view of the fruit shell co-generation device according to an embodiment of the present invention.

[0020] The reference numerals in the accompanying drawings include: 201 Biomass feeding device, 202 Furnace front biomass silo, 203 Screw feeder, 204 Biomass fuel gas-carbon coupled boiler, 205 First water-cooled screw conveyor, 206 Boiler electric feedwater pump, 207 Silencer, 208 Semi-dry desulfurization device, 209 Bag filter, 210 Boiler induced draft fan, 211 Chimney, 301 Activation reactor, 302 Second water-cooled screw conveyor, 303 Transport vehicle, 401 Steam turbine, 402 Generator, 403 Main transformer, 404 Power grid, and 501 High-temperature and high-pressure steam.

[0021] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. In the description of the embodiments of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B; the term "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone.

[0023] In the embodiments of this application, unless otherwise stated, "multiple" refers to two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of a single item or a plurality of items. Furthermore, to facilitate a clear description of the technical solutions of the embodiments of this application, the terms "first," "second," etc., are used in the embodiments of this application to distinguish identical or similar items with substantially the same function and effect. Those skilled in the art will understand that the terms "first," "second," etc., do not limit the quantity or execution order, and that "first," "second," etc., do not necessarily imply differences.

[0024] In this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being better or more advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner to facilitate understanding.

[0025] The technical solution of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Figure 1 A flowchart of a method for cogeneration of carbon from nut shells according to an embodiment of the present invention is shown.

[0027] like Figure 1 As shown, the present invention provides a method for co-producing carbon from fruit shells, comprising the following steps: S100: After pretreatment, the biomass shell raw material is temporarily stored in the pre-furnace biomass silo.

[0028] The pretreatment of the nut shell raw materials includes crushing the raw materials to a particle diameter range of 10-30cm, and then feeding them into the pre-furnace biomass silo for temporary storage via a belt conveyor, such as a screw feeder. At the same time, a level gauge can be installed in the pre-furnace biomass silo to realize automatic feeding control and avoid the raw material level of the nut shell raw materials being too low or too high.

[0029] S200: The pre-treated nutshell raw material is fed into the carbonization furnace at the bottom of the biomass fuel gas-carbon coupling boiler by a screw feeder, and crude activated carbon and volatile biomass gas are generated through a preset treatment process.

[0030] Specifically, the pre-designed processing technology includes moving the fruit shell raw material with the grate in an oxygen-limited environment, and sequentially passing it through a drying section at 150~250℃, a surface carbonization section at 350~450℃, and a deep carbonization section at 450~650℃ to generate crude activated carbon and volatile biomass gas.

[0031] In addition, the grate can be cooled by cold air. Short-circuit regulating devices are installed on both sides of the air inlet of the grate to control the surface temperature of the grate to ≤150℃. The cooled hot air is sent to the combustion chamber of the gas boiler through a bypass to participate in combustion.

[0032] S300: The volatile biomass gas enters the gas boiler at the top of the biomass fuel gas-carbon coupling boiler after passing through the biomass gas production and carbonization regulating device, heating the gas boiler and generating high-temperature and high-pressure steam.

[0033] Among them, by adjusting the opening degree of the biomass gas production and carbonization regulating device and the running speed of the grate, the oxygen limit, carbonization reaction rate and volatile biomass gas production in the carbonization furnace can be controlled.

[0034] S400: The high-temperature and high-pressure steam is divided into two paths. One path is sent to a steam turbine to drive a generator to generate electricity. The electricity generated by the generator is connected to the power grid after passing through a transformer. The other path is sent to an activated carbon activation reactor as an activation medium to activate the crude activated carbon and obtain the target activated carbon.

[0035] The steam pressure in the activation reactor can be set to 0.8~2.5MPa, the temperature range can be set to 180~350℃, and the activation time can be set to 60~120min. The target activated carbon is cooled to below 60℃ by the second water-cooled spiral conveyor before being loaded and transported.

[0036] S500: The tail flue gas of the biomass fuel gas-carbon coupled boiler is treated sequentially by a desulfurization device and a bag filter, and is discharged through a chimney after meeting the standards.

[0037] In the fruit shell cogeneration method of the present invention, the fruit shell raw materials may include any one or more combinations of coconut shells, walnut shells, apricot shells, peanut shells, wood scraps, and bamboo shavings. After the fruit shell raw materials are crushed, they are fed into an integrated biomass fuel gas-carbon cogeneration boiler. The lower grate-type carbonization furnace achieves segmented temperature-controlled continuous carbonization, and the generated volatile biomass gas can directly enter the upper combustion chamber to generate high-temperature and high-pressure steam. The high-temperature and high-pressure steam is further divided into two paths: one path drives a steam turbine to generate electricity and feeds into the power grid, and the other path serves as an activation medium for activated carbon. Finally, the boiler flue gas can be treated by semi-dry desulfurization and bag filter dust removal processes to achieve zero wastewater discharge.

[0038] As a specific example, the fruit shell co-generation method of the present invention may include: Step 1: Pre-processing of fruit shell raw materials. This involves crushing coconut shells, walnut shells, and other fruit shell raw materials to a particle size of 10-30cm, then conveying them via belt conveyor to a pre-furnace biomass silo for temporary storage. A level gauge is installed inside the silo to achieve automatic feeding control.

[0039] Step Two: Segmented temperature-controlled continuous carbonization of the fruit shell raw material. The fruit shell raw material is fed into the carbonization furnace via a screw feeder through a sealed inlet gate, moving slowly towards the tail of the furnace at a speed of 0.5-2 m / h with the grate. During this process, it sequentially passes through a 150-250℃ drying section to remove moisture, a 350-450℃ surface carbonization section to release volatile components, and a 450-650℃ deep carbonization section to enrich fixed carbon, generating crude activated carbon. This crude activated carbon is then transported to the activation reactor via a first water-cooled screw conveyor. The carbonization furnace is maintained in a slightly negative pressure sealed state throughout the process, and the carbonization reaction progress is controlled by adjusting the grate speed and the opening of the gas-generating valve.

[0040] Step 3: Biomass gas combustion treatment. The volatile biomass gas produced during carbonization accumulates at the top of the carbonization furnace and enters the upper combustion chamber through a gas generation regulating device. There, it mixes thoroughly with preheated air and combusts. The furnace temperature in the combustion chamber is controlled at 850-1100℃, heating the boiler feedwater to generate high-temperature, high-pressure steam at 1.6-2.5 MPa and 200-300℃.

[0041] Step Four: Utilization of High-Temperature and High-Pressure Steam. The high-temperature and high-pressure steam 501 is distributed by a steam distribution cylinder. 60%-70% of the steam is sent to a steam turbine to drive a generator, which then generates electricity. The electricity is stepped up by the main transformer and fed into the power grid. The remaining 30%-40% of the steam is sent to an activated carbon activation reactor, where crude activated carbon is steam-activated for 60-120 minutes at a pressure of 0.8-1.5 MPa, creating a well-developed pore structure to obtain the target activated carbon.

[0042] Step 5: Product processing and flue gas purification. The activated carbon (i.e., the target activated carbon) is cooled to below 60℃ by the second water-cooled screw conveyor 302, then sieved and packaged for sale. The boiler tail flue gas first enters a semi-dry desulfurization unit, where SO2 is removed by spraying quicklime powder, and then enters a bag filter to collect dust. After treatment, the SO2 concentration in the flue gas is ≤35mg / m³, and the dust concentration is ≤10mg / m³. After meeting the standards, it is discharged through the chimney.

[0043] As can be seen, the fruit shell cogeneration method provided by the present invention can produce activated carbon and generate high-temperature and high-pressure steam for power generation. It is highly efficient, produces high-quality finished products, and can greatly increase the porosity and active area of ​​activated carbon.

[0044] Corresponding to the above-mentioned method for co-producing carbon from fruit shells, the present invention also provides a device for co-producing carbon from fruit shells. Figure 2 and Figure 3 The schematic structure of the fruit shell cogeneration device according to an embodiment of the present invention is shown from different angles.

[0045] As attached Figure 2 and Figure 3 As shown in the figure, the shell-based cogeneration device of this invention includes: a biomass feeding system, a biomass fuel gas-carbon coupling boiler 204, an activated carbon activation system, a steam power generation system, and a flue gas purification system connected in sequence; wherein, the biomass fuel gas-carbon coupling boiler 204 is an integrated structure, with a grate-type carbonization furnace at the bottom and a gas-fired boiler at the top; the inlet of the carbonization furnace is connected to the biomass feeding system, and the outlet is connected to a first water-cooled screw conveyor 205, through which crude activated carbon is conveyed to the activation reactor; a biomass gas generation and carbonization regulation device is provided on the upper side wall of the carbonization furnace, the gas outlet of which is directly connected to the combustion zone of the gas-fired boiler, and the steam outlet of the gas-fired boiler is connected to the steam power generation system and the activated carbon activation system respectively.

[0046] The flue gas purification system includes a semi-dry desulfurization unit 208, a bag filter 209, a boiler induced draft fan 210, and a chimney 211 connected in sequence. The inlet of the semi-dry desulfurization unit 208 is connected to the tail flue of the biomass fuel gas-carbon coupling boiler 204. The biomass feeding system includes a biomass feeding device 201, a pre-furnace biomass silo 202, and a screw feeder 203 connected in sequence. Sealed regulating valves are installed at both the inlet and outlet of the carbonization furnace. The sealed regulating valves, together with the biomass gas production and carbonization regulating devices, form a closed oxygen-limiting system.

[0047] Furthermore, the steam power generation system includes a steam turbine 401, a generator 402, and a main transformer 403 connected in sequence, wherein the output end of the main transformer 403 is connected to the power grid 404.

[0048] The activated carbon activation system includes an activation reactor 301 and a first water-cooled screw conveyor 205. The inlet of the activation reactor 301 is connected to the first water-cooled screw conveyor 205, and the outlet of the activation reactor 301 is connected to a second water-cooled screw conveyor 302. The target activated carbon is transported to the transport vehicle 303 through the second water-cooled screw conveyor 302 to complete the loading and transportation. The steam inlet of the activation reactor 301 is connected to the steam outlet of the biomass fuel gas-carbon coupling boiler 204.

[0049] In addition, the biomass fuel gas-carbon coupled boiler 204 is also equipped with at least two boiler electric feedwater pumps 206 and silencers 207. The bottom of the grate is equipped with an air-cooled air intake system, which is connected to the bypass flue to the combustion chamber of the gas boiler.

[0050] In a specific real-time mode of the present invention, the fruit shell cogeneration device further includes a PLC automatic control system and an online flue gas monitoring device; wherein, the PLC automatic control system is electrically connected to the grate drive device, the electric actuator of the biomass gasification and carbonization adjustment device, the steam regulating valve, and the online flue gas monitoring device, respectively, so as to monitor and automatically adjust the carbonization temperature, grate speed, steam parameters, and flue gas emissions in real time.

[0051] The above-described method and apparatus for cogeneration of activated carbon from nut shells according to the present invention employs an integrated biomass fuel gas-carbon coupling boiler, in which volatile biomass gas is directly burned and utilized within the furnace, eliminating losses during storage and transportation. The overall energy utilization rate is increased from less than 60% in traditional processes to over 85%. Power generation revenue can cover more than 30% of production energy consumption, achieving energy self-sufficiency. Furthermore, it eliminates the construction investment and operating costs of biomass gas storage and transportation facilities; high-temperature, high-pressure steam can be produced and used independently, reducing the overall production cost per unit of activated carbon; and the continuous grate carbonization process increases the daily processing capacity of nut shell raw materials per furnace. Combined with segmented temperature control technology and a PLC automatic control system, the carbonization reaction process is controllable, ensuring stable product quality.

[0052] 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. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for cogeneration of carbon from fruit shells, characterized in that, include: After pretreatment, the biomass shell raw materials are temporarily stored in the pre-furnace biomass silo. The pre-treated nutshell raw material is fed into the carbonization furnace at the bottom of the biomass fuel gas-carbon coupling boiler via a screw feeder, and crude activated carbon and volatile biomass gas are generated through a preset treatment process; The volatile biomass gas enters the gas boiler at the top of the biomass fuel gas-carbon coupling boiler after passing through the biomass gas production and carbonization regulating device, heating the gas boiler and generating high-temperature and high-pressure steam. The high-temperature and high-pressure steam is divided into two paths. One path is sent to a steam turbine to drive a generator to generate electricity. The electricity generated by the generator is then connected to the power grid after passing through a transformer. The other path is sent to an activated carbon activation reactor as an activation medium to activate the crude activated carbon and obtain the target activated carbon. The tail flue gas of the biomass fuel gas-carbon coupled boiler is treated sequentially by a desulfurization device and a bag filter, and then discharged through a chimney after meeting the standards.

2. The method for cogeneration of carbon from fruit shells according to claim 1, characterized in that, The pretreatment includes: crushing the fruit shell raw material to a particle diameter of 10-30 cm; The preset processing technology includes: moving the fruit shell raw material with the grate in an oxygen-limited environment, and sequentially passing it through a drying section at 150~250℃, a surface carbonization section at 350~450℃, and a deep carbonization section at 450~650℃ to generate the crude activated carbon and the volatile biomass gas.

3. The method for cogeneration of carbon from fruit shells according to claim 2, characterized in that, The grate is cooled by cold air, and short-circuit regulating devices are provided on both sides of the air inlet of the grate to control the surface temperature of the grate to ≤150℃. The cooled hot air is sent to the combustion chamber of the gas boiler through a bypass to participate in combustion.

4. The method for cogeneration of carbon from fruit shells according to claim 2, characterized in that, By adjusting the opening degree of the biomass gas production and carbonization regulating device and the running speed of the grate, the oxygen limitation degree, carbonization reaction rate and volatile biomass gas production in the carbonization furnace are controlled.

5. The method for cogeneration of carbon from fruit shells according to claim 1, characterized in that, The steam pressure in the activation reactor ranges from 0.8 to 2.5 MPa, the temperature ranges from 180 to 350°C, and the activation time is 60 to 120 minutes. The target activated carbon is cooled to below 60°C by a second water-cooled screw conveyor before being loaded and transported.

6. The method for cogeneration of carbon from fruit shells according to claim 1, characterized in that, The raw materials for the fruit shells include any one or more combinations of coconut shells, walnut shells, apricot shells, peanut shells, wood scraps, and bamboo shavings.

7. A fruit shell co-generation apparatus for implementing the fruit shell co-generation method as described in any one of claims 1 to 6, characterized in that, The device comprises, in sequence, a biomass feeding system, a biomass fuel steam-carbon coupled boiler, an activated carbon activation system, a steam power generation system, and a flue gas purification system; wherein... The biomass fuel gas-carbon coupling boiler has an integrated structure, with a grate-type carbonization furnace at the bottom and a gas-fired boiler at the top. The feed inlet of the carbonization furnace is connected to the biomass feeding system, and the discharge outlet is connected to the first water-cooled screw conveyor. A biomass gas production and carbonization regulation device is provided on the upper side wall of the carbonization furnace. The gas outlet of the biomass gas production and carbonization regulation device is directly connected to the combustion zone of the gas-fired boiler. The steam outlet of the gas-fired boiler is connected to the steam power generation system and the activated carbon activation system, respectively. The flue gas purification system includes a semi-dry desulfurization device, a bag filter, a boiler induced draft fan, and a chimney connected in sequence. The air inlet of the desulfurization device is connected to the tail flue of the biomass fuel gas-carbon coupled boiler.

8. The fruit shell cogeneration device according to claim 7, characterized in that, The biomass feeding system includes a biomass feeding device, a pre-furnace biomass bin, and a screw feeder connected in sequence. Both the feed inlet and discharge outlet of the carbonization furnace are equipped with sealing regulating gates, which, together with the biomass gasification and carbonization regulating device, form a closed oxygen-limiting system.

9. The fruit shell cogeneration device according to claim 7, characterized in that, The steam power generation system includes a steam turbine, a generator, and a main transformer connected in sequence, with the output terminal of the main transformer connected to the power grid. The activated carbon activation system includes an activation reactor and the first water-cooled spiral conveyor. The feed inlet of the activation reactor is connected to the first water-cooled spiral conveyor, and the steam inlet of the activation reactor is connected to the steam outlet of the biomass fuel gas-carbon coupling boiler. The outlet of the activation reactor is connected to a second water-cooled spiral conveyor, which is used for loading and transportation. The biomass fuel gas-carbon coupled boiler is also equipped with at least two boiler electric feedwater pumps; the bottom of the grate is equipped with an air-cooled air intake system, which is connected to the bypass flue to the combustion chamber of the gas boiler.

10. The fruit shell cogeneration device according to claim 7, characterized in that, It also includes a PLC automatic control system and an online flue gas monitoring device; among which, The PLC automatic control system is electrically connected to the drive device of the grate, the electric actuator of the biomass gas production and carbonization adjustment device, the steam regulating valve, and the flue gas online monitoring device to monitor and automatically adjust the carbonization temperature, grate speed, steam parameters, and flue gas emissions in real time.

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