A device for removing tar from biomass char by waste treatment

Abstract

The utility model discloses a device is removed to waste biomass charcoal tar with waste, and it includes: gasification furnace, tar adsorption tower and exhaust pipe, the top of gasification furnace is provided with raw material import and first gas outlet, and the bottom is equipped with gasification agent import, the bottom of tar adsorption tower is equipped with first gas import, and first gas import communicates with the first gas outlet of gasification furnace, the top of tar adsorption tower is provided with carbon particle import and second gas outlet, the waste carbon particle that obtains in gasification furnace is filtered, extruded and then enters tar adsorption tower from carbon particle import and adsorbs tar, and is reused, the exhaust pipe is connected with second gas outlet, and is provided with tar detector and air draught fan on the exhaust pipe, the device in the utility model utilizes the waste carbon produced in the gasification process to prepare adsorbent, constructs the closed loop circulation system of waste carbon adsorbing tar-absorbed carbon back to gasification, realizes the double goal of tar efficient removal and waste carbon resource utilization.

Description

Technical Field

[0001] This utility model relates to the field of tar removal technology, and more specifically to a device for removing tar using biochar from waste. Background Technology

[0002] Biomass energy, as a clean and renewable energy source, has attracted widespread attention for its development and utilization. Biomass gasification technology is a technique that converts biomass (such as straw, sawdust, rice husks, etc.) into combustible gas (mainly composed of CO, H2, CH4, etc.) through reactions such as pyrolysis, oxidation, and reduction under anaerobic or hypoxic conditions. This technology can convert dispersed biomass resources into centrally utilized gas and has broad application prospects in fields such as industrial heating and power generation.

[0003] However, a core technical challenge in biomass gasification is tar formation. Tar is a complex mixture of aromatic compounds produced during biomass pyrolysis, typically accounting for 5%-10% of the calorific value of biomass gas. The presence of tar severely restricts the widespread application of biomass gas: on the one hand, tar easily condenses during gas transportation, adhering to the inner walls of pipes, valves, heat exchangers, and other equipment, causing blockages and corrosion, reducing equipment lifespan and operational stability; on the other hand, in fields with stringent requirements for gas cleanliness, tar in the gas can cause surface defects (discoloration, spots, odors) on products, affecting product quality and even preventing biomass gas from meeting industry standards.

[0004] Currently, existing biomass tar removal technologies are mainly divided into three categories: physical methods, chemical methods, and biological methods.

[0005] Physical methods include cyclone separation, filtration, washing, and adsorption. Cyclone separation can only remove larger tar particles, resulting in low removal efficiency. Filtration requires filter media such as quartz sand and ceramic fibers, which can improve tar removal efficiency, but the filter media is prone to clogging and requires frequent replacement, increasing operating costs and complexity. Washing absorbs tar through water spraying; while the equipment is simple, it generates tar-containing wastewater, causing secondary pollution, and wastewater treatment is difficult and extremely costly. Adsorption typically uses adsorbents such as activated carbon and molecular sieves, achieving high tar removal efficiency, but the adsorbents are expensive, require regeneration or replacement after saturation, and the regeneration process is energy-intensive. Furthermore, discarded adsorbents easily cause secondary pollution, making sustainable utilization difficult.

[0006] Chemical methods mainly include catalytic cracking and thermal cracking. Catalytic cracking uses catalysts such as Ni-based catalysts, dolomite, and olivine to break down tar into small-molecule combustible gases (CO, H2, CH4), achieving the resource conversion of tar. However, it suffers from problems such as easy carbon deposition and deactivation of catalysts, a service life of only 3-6 months, and high catalyst preparation costs. Thermal cracking requires high temperatures above 1000℃, resulting in high energy consumption and stringent requirements for the high-temperature resistance of equipment, increasing equipment investment costs.

[0007] Biological method: Utilizing microorganisms to degrade tar has the advantages of mild reaction conditions (normal temperature and pressure) and environmental friendliness. However, at present, the degradation efficiency of microorganisms is low and the reaction cycle is long, which makes it difficult to meet the requirements of industrial-scale production for gas treatment efficiency. It is still in the laboratory research stage.

[0008] Furthermore, biomass gasification also generates a large amount of waste carbon (also known as gasification coke), whose main components are fixed carbon content typically between 60% and 80%, ash, and a small amount of unreacted biomass residue. In current technologies, most of this waste carbon is directly disposed of through landfill or incineration, resulting in a serious waste of carbon resources. Landfilling also occupies land resources and pollutes soil and groundwater, while incineration releases pollutants such as CO2 and SO2, which does not conform to the development requirements of "carbon peaking and carbon neutrality" and the concept of a circular economy.

[0009] Meanwhile, the existing structural design of biomass gasifiers also has shortcomings. The height-to-diameter ratio (the ratio of the furnace height to the furnace diameter) of traditional biomass gasifiers is usually (2.4-2.7):1. This height-to-diameter ratio design results in a short residence time of biomass gas in the furnace, insufficient gas cooling, and a large amount of high-temperature gas carrying tar being directly discharged from the gasifier, increasing the difficulty and load of subsequent tar removal processes.

[0010] Therefore, developing a device for removing tar using biomass char that has high tar removal efficiency and utilizes waste carbon resources is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0011] In view of this, the present invention provides a device for removing tar using biomass char, which has high tar removal efficiency and utilizes waste carbon resources.

[0012] To achieve the above objectives, the present invention adopts the following technical solution:

[0013] A device for removing tar from waste biochar, comprising:

[0014] A gasifier, wherein the top of the gasifier has a raw material inlet and a first gas outlet, and the bottom has a gasifying agent inlet;

[0015] The tar adsorption tower has a first gas inlet at its bottom, which is connected to the first gas outlet of the gasifier; the top of the tar adsorption tower has a carbon particle inlet and a second gas outlet; the waste carbon particles obtained in the gasifier are filtered and compressed, and then enter the tar adsorption tower through the carbon particle inlet to adsorb tar and are reused.

[0016] An exhaust pipe is connected to the second gas outlet, and a tar detector and an induced draft fan are installed on the exhaust pipe.

[0017] The beneficial effects of adopting the above technical solution are that by connecting the gasifier, tar adsorption tower, and exhaust pipe in a three-stage series, the waste carbon particles produced by the gasifier are directly made into a flowable adsorbent, which comes into countercurrent contact with the tar-containing gas in the tar adsorption tower, thus achieving waste treatment with waste. The adsorbed carbon particles can be recycled back into the furnace for gasification, forming a closed loop of waste carbon → adsorbent → gasification feedstock. This not only saves the cost of purchasing activated carbon, but also solves the secondary pollution caused by waste carbon landfill or incineration, achieving the dual goals of efficient tar removal and waste resource utilization.

[0018] Preferably, the ratio of the furnace height to the furnace diameter of the gasifier is (3.2-3.5):1. Increasing the furnace height-to-diameter ratio from the traditional (2.4-2.7):1 to (3.2-3.5):1 prolongs the residence time of the gas in the furnace, allowing the high-temperature gas to cool naturally inside the furnace. This causes the high-boiling-point tar to be condensed, trapped, and subjected to secondary cracking by the material layer inside the furnace, reducing the tar load at the inlet of the subsequent adsorption tower.

[0019] Preferably, the interior of the gasifier is divided into an oxidation zone, a reduction zone, a pyrolysis zone, and a drying zone from bottom to top. Temperature sensors are installed on the inner walls of each of the oxidation, reduction, pyrolysis, and drying zones, with multiple temperature sensors in the same reaction zone arranged in a ring along the inner wall of the gasifier. The evenly distributed ring of temperature sensors in the four zones (oxidation, reduction, pyrolysis, and drying) allows for real-time monitoring of temperature deviations within the furnace. When the temperature on one side exceeds the average by more than 50°C, it is determined to be "off-center burning," providing a quantitative basis for zoned airflow adjustment, preventing localized overheating, and ensuring uniform furnace temperature.

[0020] Preferably, an arc-shaped air duct is provided on the side wall of the oxidation zone of the gasifier, and multiple arc-shaped air ducts are arranged in a ring on the inner wall of the gasifier.

[0021] Preferably, the surface of the arc-shaped air duct is provided with an air outlet, and a regulating valve is provided on the pipeline of the arc-shaped air duct; all of the arc-shaped air ducts are connected to the gasification annular fan.

[0022] Preferably, a water-cooled jacket is provided on the side wall of the gasifier.

[0023] Preferably, a cooling water pipeline is provided on the inner wall of the tar adsorption tower. The cooling water pipeline on the inner wall of the tar adsorption tower can further cool the gas, causing the low-boiling-point tar to condense into a liquid state, making it easier for the carbon particles to capture it.

[0024] Preferably, the second gas outlet is connected to a two-stage cyclone dust collector, and the exhaust port of the second-stage cyclone dust collector is connected to the exhaust pipe.

[0025] Preferably, the carbon particles that have adsorbed tar and are discharged from the tar adsorption tower are mixed with biomass raw materials at a ratio of 1:15 and then transported back into the gasifier.

[0026] Preferably, the waste carbon particles discharged from the gasifier are screened and retained to have a particle size of less than 10 mm, and then extruded to obtain carbon particles with a particle size of more than 100 mm and a bulk density of 0.5-1.5 g / cm3.

[0027] As can be seen from the above technical solution, compared with the prior art, this utility model discloses a device for removing tar from waste biochar, the beneficial effects of which are:

[0028] (1) The device directly processes the waste carbon particles generated by the gasifier into adsorbents to capture tar in the gas. After the adsorption is saturated, it is sent back to the furnace for high-temperature pyrolysis. This saves the cost of purchasing high-priced adsorbents such as activated carbon and molecular sieves, and also eliminates the secondary pollution caused by waste carbon landfill and incineration, realizing a closed-loop cycle of "waste-raw material-re-waste-re-raw material".

[0029] (2) By increasing the height of the furnace body and expanding the height-to-diameter ratio, and by combining the water-cooled jacket and the zoned temperature control structure, the residence time of the gas in the furnace is significantly extended and the outlet temperature is reduced, so that most of the high-boiling-point tar is condensed, intercepted and cracked in the furnace, reducing the tar load entering the subsequent process from the source and reducing the pressure of subsequent adsorption and purification. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0031] Figure 1 The attached figure is a schematic diagram of the overall structure of the device provided by this utility model;

[0032] Figure 2 The attached figure shows the invention provided by this utility model. Figure 1 Enlarged view of the structure at point A in the middle;

[0033] Figure 3 The attached figure shows the invention provided by this utility model. Figure 1 Enlarged view of the structure at point B;

[0034] Figure 4 The attached figure is a structural schematic diagram of the regulating valve and the arc-shaped air duct connection provided by this utility model.

[0035] In the figure,

[0036] 1-Gasifier;

[0037] 11-Raw material import; 12-First gas outlet; 13-Gasification agent import;

[0038] 2-Tar adsorption tower;

[0039] 21-First gas inlet; 22-Carbon pellet inlet; 23-Second gas outlet;

[0040] 3-Exhaust pipe; 4-Tar detector; 5-Exhaust fan; 6-Blower; 7-Temperature sensor; 8-Regulating valve; 9-Arc-shaped duct; 10-Gasification ring fan; 011-Heat exchanger; 012-Circulating cooling water tank; 013-Water pump; 014-Cyclone dust collector. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0042] This utility model discloses a device for removing tar from biochar used in waste treatment, comprising:

[0043] Gasifier 1 has a raw material inlet 11 and a first gas outlet 12 at the top and a gasifying agent inlet 13 at the bottom.

[0044] The tar adsorption tower 2 has a first gas inlet 21 at the bottom, which is connected to the first gas outlet 21 of the gasifier 1; the top of the tar adsorption tower 2 has a carbon particle inlet 22 and a second gas outlet 23; the waste carbon particles obtained in the gasifier 1 are filtered and squeezed and then enter the tar adsorption tower 2 from the carbon particle inlet to adsorb tar and reuse it.

[0045] Exhaust pipe 3 is connected to the second gas outlet 23. Tar detector 4 and induced draft fan 5 are installed on exhaust pipe 3.

[0046] In one embodiment, the ratio of the height to the diameter of the gasifier 1 is (3.2-3.5):1. Increasing the height-to-diameter ratio of the gasifier 1 can increase the height of the biomass oxidation layer and improve the efficiency of the gasifier 1.

[0047] In this application, the ratio of the height to the diameter of the conventional gasifier 1 is increased from (2.4-2.7):1 to (3.2-3.5):1. By increasing the height-to-diameter ratio, the residence time of biomass gas in the gasifier 1 is extended, allowing the gas to cool down naturally inside the furnace (the temperature drops from 100-300℃ to 50-80℃).

[0048] In one embodiment, biomass feedstock enters the biomass gasifier 1 from the feedstock inlet at the top of the gasifier 1 via a feeding conveyor and a screw conveyor. A gasifying agent is blown in from the bottom of the gasifier 1 using a blower 6. The gasifying agent undergoes pyrolysis, oxidation, and reduction reactions in the pyrolysis reaction zone (temperature 800-900℃) at the bottom of the gasifier 1 to generate biomass fuel gas. The rising biomass fuel gas causes some of the high-boiling-point tar in the fuel gas to condense into a liquid state, adsorbed onto the surface of the biomass feedstock, and remaining inside the gasifier 1, achieving initial tar separation. Furthermore, the tar adsorbed on the surface of the biomass feedstock is decomposed into small-molecule combustible gases (CO, H2, CH4, etc.) at high temperature within the gasifier 1 as the biomass material descends.

[0049] In one embodiment, the interior of the gasifier 1 consists of an oxidation zone, a reduction zone, a pyrolysis zone, and a drying zone, arranged from bottom to top. Temperature sensors 7 are installed on the inner walls of the oxidation zone, reduction zone, pyrolysis zone, and drying zone of the gasifier 1. Multiple temperature sensors 7 in the same reaction zone of the gasifier 1 are arranged in a ring along the inner wall of the gasifier 1.

[0050] Four temperature sensors (7) can be installed in the same reaction zone of the gasifier 1, evenly distributed in a ring. Temperature sensors (7) detect the combustion temperature within the gasifier 1. If the temperature on one side is too high, the corresponding regulating valve (8) is controlled to adjust the airflow and control combustion, preventing uneven combustion. Four arc-shaped air ducts (9) can be installed. If the temperature on one side of the gasifier (7) is more than 50°C higher than other sensors, uneven combustion is detected, and the opening of the regulating valve (8) on the higher temperature side is reduced. Reducing the valve opening decreases the airflow, thus reducing combustion.

[0051] In one embodiment, an arc-shaped air duct 9 is provided on the side wall of the oxidation zone of the gasifier 1, and multiple arc-shaped air ducts 9 are arranged in a ring on the inner wall of the gasifier 1. Figure 4 As shown, the gasification annular fan 10 is connected to the annular pipe, and multiple arc-shaped air ducts 9 are connected to the annular pipe through pipelines. The regulating valve 8 is installed on the pipeline connecting the arc-shaped air ducts 9 and the annular pipe.

[0052] In one embodiment, the surface of the arc-shaped air duct 9 is provided with an air outlet, and a regulating valve 8 is provided on the pipeline of the arc-shaped air duct 9; multiple arc-shaped air ducts 9 are connected to the gasification annular fan 10.

[0053] In one embodiment, a water-cooled jacket is provided on the side wall of the gasifier 1. The water-cooled jacket of the gasifier 1, through circulating water, protects the gasification reaction. The gasification combustion temperature is 900-1000℃. The circulating water protects the gasifier body from burn-through and also lowers the temperature of the gasified fuel, causing tar to condense inside the gasifier 1. A heat exchanger 011 is externally connected to the water-cooled jacket to cool the water flowing out of the jacket. Simultaneously, the heat exchanger 011 is also connected to the blower 6 to increase the inlet air temperature of the blower 6, thereby heating the gasifying agent and improving combustion efficiency.

[0054] In one embodiment, the waste carbon produced by the gasification reaction is deposited at the bottom of the gasifier 1. A rotary grate is installed at the discharge port at the bottom of the gasifier 1 to discharge the waste carbon particles. The biomass gas after preliminary cooling (containing 200-300 mg / m³ of tar) 3 It is discharged from the first gas outlet 12 at the top of the gasifier 1 and enters the subsequent tar adsorption process.

[0055] In one embodiment, a cooling water pipeline is installed on the inner wall of the tar adsorption tower 2. The cooling water pipeline lowers the temperature of the biomass gas, causing small-molecule tar to condense and be adsorbed by carbon particles. Circulating cooling water (controlled at 20-30°C) is supplied to the cooling water pipeline of the tar adsorption tower 2 via a circulating cooling water tank 012 and a water pump 013, cooling the gas and carbon particles inside the tar adsorption tower 2, reducing the gas temperature from 50-100°C to 30-50°C. This low-temperature environment causes the remaining low-boiling-point tar in the gas to condense into a liquid or semi-solid state, making it easier for the carbon particles to adsorb, further improving the tar removal efficiency.

[0056] In one embodiment, the second gas outlet 23 is connected to a two-stage cyclone dust collector 014, and the exhaust port of the second-stage cyclone dust collector 014 is connected to the exhaust pipe 3. The cyclone dust collector 014 is installed after the tar adsorption tower 2. After the tar adsorption is completed, the gas will carry out some ash and carbon in the tar adsorption tower 2. The ash and carbon can be filtered out by the two-stage cyclone dust collector 014.

[0057] A tar detector 015 is installed at the gas outlet of the cyclone dust collector 014 to monitor the tar content in the purified gas in real time. When the value of the tar detector 015 rises, the rotary grate at the bottom of the tar adsorption tower 2 discharges the adsorbed carbon particles, forming a closed-loop control system. When the tar detector 015 detects that the tar content of the purified gas exceeds the control value (here, it exceeds the set value, which is slightly smaller than the actual range value, so as to ensure that even if the tar content exceeds the set value, it is still within the actual required range), the controller sends a signal to start the rotary grate to increase the discharge of carbon particles and accelerate the entry speed of carbon particles, ensuring that there is always a sufficient amount of fresh adsorbent in the tar adsorption tower 2; when the tar detector 015 detects that the tar content of the purified gas is lower than the control value, the controller sends a signal to stop the grate speed and reduce the amount of fresh carbon particles added to avoid wasting adsorbent; through the above control, the tar content of the purified gas is stably controlled within the control value range, meeting the requirements of gas cleanliness.

[0058] In one embodiment, the carbon particles discharged from the tar adsorption tower 2, after adsorbing tar, are mixed with biomass feedstock at a ratio of 1:15 and then reintroduced into the gasifier 1. The mixed feedstock is added to the gasifier 1 via a biomass feeding belt and a screw feeder to participate in the pyrolysis gasification reaction. The fixed carbon in the carbon particles after tar adsorption can continue to participate in the gasification reaction to generate combustible gases. The adsorbed tar can be decomposed into small molecule combustible gases (CO, H2, CH4, etc.) at high temperatures (800-900℃), achieving deep resource utilization of tar while avoiding secondary pollution from adsorbed carbon, forming a closed-loop cycle of waste carbon-adsorbent-gasification feedstock.

[0059] In one embodiment, waste carbon particles discharged from gasifier 1 are screened to retain those smaller than 10 mm, and then extruded to obtain carbon particles with a particle size of 100 mm or more and a bulk density of 0.5-1.5 g / cm3.

[0060] The waste carbon particles discharged from gasifier 1 are conveyed to a screening device to remove hard lumps (particle size greater than 10 mm) and impurities (soil, stones, metal fragments, etc.). The screening device ensures that the waste carbon particles obtained after screening have a particle size of less than 10 mm. This particle size range ensures the feasibility of subsequent granulation and provides sufficient specific surface area for tar adsorption. The screened waste carbon particles are then conveyed to carbon particle production equipment, where they are extruded and shaped under ambient temperature and an extrusion pressure of 10-15 MPa to produce particles with a diameter of more than 100 mm and a bulk density of 0.5-1.5 g / cm³. 3 The carbon particles retain the fixed carbon in the waste carbon, have a rich porous structure, and possess good tar adsorption performance, making them suitable for use as tar adsorbents.

[0061] The prepared carbon particles are conveyed to the upper carbon particle inlet 22 of the tar adsorption tower 2 via a screw conveyor. Under the action of gravity, the carbon particles move downward from the top of the coke adsorption tower 2. At the same time, the tar-containing biomass gas discharged from the top of the gasifier 1 is introduced into the lower first gas inlet 21 of the tar adsorption tower 2. Under the action of pressure difference, the gas moves upward from the bottom of the coke adsorption tower 2, realizing countercurrent contact between the carbon particles and the gas. Countercurrent contact can extend the contact time between the carbon particles and the gas to 4-5 seconds, which greatly improves the adsorption efficiency.

[0062] Work process:

[0063] Biomass feedstock is conveyed to the top feedstock inlet of the gasifier by a belt conveyor. A blower sends the gasifying agent into the gasifier through the bottom gasifying agent inlet. The high-temperature gas flows counter-currently upwards, significantly extending its residence time in the furnace: high-boiling-point tar condenses upon cooling and is trapped by the feed layer; the descending material carries the tar into the high-temperature oxidation zone for further cracking into small-molecule combustible gas; the waste carbon particles generated in the gasifier are screened and compressed into carbon particles of about φ100mm, which then enter the tar adsorption tower to adsorb tar; the gas discharged from the first gas outlet at the top of the furnace enters the tower through the first gas inlet at the bottom of the tar adsorption tower, coming into counter-current contact with the carbon particles falling evenly from the top; the tower wall cooling water pipes cool down, causing the residual low-boiling-point tar to condense into a liquid state; the 100mm large carbon particles adsorb tar; the gas flows out from the second gas outlet at the top of the tower, is dusted by a two-stage cyclone dust collector, and is then monitored in real time by a line tar detector; if the tar content increases, the system automatically increases the feeding speed of fresh carbon particles and simultaneously discharges the carbon particles that have adsorbed tar. The carbon particles that adsorb tar are discharged from the bottom of the tower via a rotary grate, mixed evenly with biomass feedstock at a ratio of 1:15, and then fed back into the gasifier via the feeding system.

[0064] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0065] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for removing tar from biochar used in waste treatment, characterized in that, include: A gasifier, wherein the top of the gasifier has a raw material inlet and a first gas outlet, and the bottom has a gasifying agent inlet; The tar adsorption tower has a first gas inlet at its bottom, which is connected to the first gas outlet of the gasifier; the top of the tar adsorption tower has a carbon particle inlet and a second gas outlet; the waste carbon particles obtained in the gasifier are filtered and compressed, and then enter the tar adsorption tower through the carbon particle inlet to adsorb tar and are reused. An exhaust pipe is connected to the second gas outlet, and a tar detector and an induced draft fan are installed on the exhaust pipe.

2. The device for removing tar from biochar using waste treatment according to claim 1, characterized in that, The ratio of the furnace height to the furnace diameter of the gasifier is (3.2-3.5):

1.

3. The device for removing tar from biochar using waste treatment according to claim 1, characterized in that, The interior of the gasifier consists of an oxidation zone, a reduction zone, a pyrolysis zone, and a drying zone, arranged from bottom to top. Temperature sensors are installed on the inner walls of the oxidation zone, reduction zone, pyrolysis zone, and drying zone of the gasifier. Multiple temperature sensors in the same reaction zone of the gasifier are arranged in a ring along the inner wall of the gasifier.

4. The device for removing tar from biochar in waste treatment according to claim 3, characterized in that, An arc-shaped air duct is installed on the side wall of the oxidation zone of the gasifier, and multiple arc-shaped air ducts are arranged in a ring on the inner wall of the gasifier.

5. The device for removing tar from biochar using waste treatment according to claim 4, characterized in that, The surface of the arc-shaped air duct is provided with air outlet holes, and the pipeline of the arc-shaped air duct is provided with a regulating valve; multiple arc-shaped air ducts are connected to a gasification ring fan.

6. The device for removing tar from biochar using waste treatment according to claim 1, characterized in that, The gasifier is equipped with a water-cooled jacket on its side wall.

7. The apparatus for removing tar from biochar using waste treatment according to claim 1, characterized in that, Cooling water pipes are installed on the inner wall of the tar adsorption tower.

8. The device for removing tar from biochar using waste treatment according to claim 1, characterized in that, The second gas outlet is connected to a two-stage cyclone dust collector, and the exhaust port of the second-stage cyclone dust collector is connected to the exhaust pipe.

9. The apparatus for removing tar from biochar in waste treatment according to claim 1, characterized in that, The carbon particles that have adsorbed tar and are discharged from the tar adsorption tower are mixed with biomass raw materials at a ratio of 1:15 and then transported back into the gasifier.

10. The apparatus for removing tar from biochar in waste treatment according to claim 9, characterized in that, The waste carbon particles discharged from the gasifier are screened to retain those smaller than 10mm, and then extruded to obtain particles with a diameter of 100mm or larger and a bulk density of 0.5-1.5g / cm³. 3 Carbon particles.

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