A thermal desorption device for organic matter contaminated soil

Abstract

The invention relates to the technical field of soil thermal desorption, and discloses a thermal desorption device for soil contaminated by organic matter, comprising a first storage tank for storing soil and calcium oxide, and a second storage tank for storing coal powder; the device can effectively absorb and fix pollutants, and avoid the problem that pollutants are easily released again during the treatment process, thereby improving the treatment efficiency and safety; a mixer connected to the discharge port of the first storage tank and the discharge port of the second storage tank, respectively, the first storage tank can add soil and calcium oxide into the mixer, and the second storage tank can add coal powder into the mixer; a heat carrier heater for adding heat carrier into the mixer through a pipeline, the heat carrier of the heat carrier heater can be activated alumina ceramic balls and coke, and the mixer is used to fully mix the soil, calcium oxide, coal powder, activated alumina ceramic balls and coke inside the mixer, so that the soil is evenly distributed, thereby solving the problem of uneven heat transfer in thermal desorption treatment.

Description

Technical Field

[0001] The invention relates to the technical field of soil thermal desorption, and more specifically to a thermal desorption device for soil contaminated by organic matter. Background Art

[0002] Industries such as petrochemicals, coking, and pesticides that involve organic solvents such as arsenic, benzene, and halogenated hydrocarbons will have their raw materials and products flow into water bodies and soil. When reclaiming or developing and constructing on the original site, the pollutants must be reduced to within the limit before such land can be used, which requires the use of a thermal desorption device.

[0003] A patent application with publication number CN206731797U discloses a thermal desorption device for organic contaminated soil, comprising a pretreatment device with a feed port, a thermal desorption device with a discharge port, and an exhaust gas treatment device which are arranged in sequence. The pretreatment device is provided with a pretreatment chamber connected to the feed port, and at least two parallel cutting plates which are slidably connected to the inner wall of the pretreatment chamber are provided in the pretreatment chamber below the discharge port. The cutting plate comprises a cutting frame and a plurality of cutting blocks which are arranged in parallel in the cutting frame. All the cutting plates are connected to a driving member which drives the cutting plates to reciprocate. There is an angle between the movement direction of the cutting blocks and the cutting plates, and the movement trajectory of the cutting plates is parallel to the plane where the cutting plates are located.

[0004] However, in the prior art, it is difficult to effectively absorb and fix pollutants, making it easy for pollutants to be released again during the treatment process, thereby reducing the treatment efficiency and safety. At the same time, due to the uneven distribution of soil, the heat transfer in the thermal desorption treatment is uneven, resulting in unsatisfactory treatment results.

[0005] To this end, the present invention provides a thermal desorption device for organic matter contaminated soil. Summary of the invention

[0006] The present invention provides a thermal desorption device for organic contaminated soil, which solves the technical problem in the related art that due to large or unevenly distributed soil particles, heat transfer in thermal desorption treatment is uneven, resulting in unsatisfactory treatment effect.

[0007] The invention provides a thermal desorption device for organic polluted soil, comprising a first storage tank for storing soil and calcium oxide. In an initial state, stones, plastics and other sundries in the polluted soil are first sorted out, and the soil blocks are crushed to less than 1 mm, so as to crush the soil into small particles, increase the surface area of ​​contact between subsequent reactants and the soil, and improve the efficiency of subsequent reactions. Then, 0-1 mm calcium oxide or calcium carbonate is mixed into the soil in proportion, so as to allow the calcium oxide or calcium carbonate to generate corresponding compounds with chlorine and arsenic, reduce the gas phase chlorine and arsenic content in the soil, effectively absorb and fix pollutants, and avoid the problem that pollutants are easily released again during the treatment process, thereby improving the treatment efficiency and safety. Then, the mixture of calcium oxide and soil is stored in the first storage tank; a second storage tank for storing coal powder is used to store the mixture of calcium oxide and soil. A storage tank; a mixer connected to a first storage tank discharge port and a second storage tank discharge port respectively through pipelines, wherein the first storage tank discharge port and the second storage tank discharge port are both connected to a mixer feed port, wherein the first storage tank can add soil and calcium oxide to the mixer, and the second storage tank can add coal powder to the mixer; a heat carrier heater for adding heat carrier to the mixer through pipelines, wherein the heat carrier of the heat carrier heater can be activated alumina ceramic balls and coke, and wherein the mixer is used to fully mix the soil, calcium oxide, coal powder, activated alumina ceramic balls and coke therein, so that the soil is evenly distributed, thereby solving the problem of uneven heat transfer in thermal desorption treatment; a first riser connected to the mixer, wherein the mixer discharge port is connected to the feed port of the first riser through a pipeline;The gasifier is connected to the first lifting pipe, the first lifting pipe is used to transfer the mixture in the mixer to the gasifier, the first lifting pipe can be a spiral lifting machine, the first lifting pipe outlet is connected to the feed port of the gasifier through a pipeline, the gasifier can be a graded gasifier, the graded gasifier is divided into three chambers from top to bottom, namely a drying chamber, a retorting chamber and a cooling chamber, by setting the graded gasifier, the coal powder is gasified in the retorting chamber of the graded gasifier, the organic matter on the soil absorbs heat and gasifies and precipitates and reacts with oxygen, wherein the pollution components such as arsenic and chlorine react with calcium oxide to generate corresponding Oxides, when the soil temperature in the gasifier rises to above the boiling point of toluene, chlorobenzene, etc., escape from the soil surface and are oxidized into water and carbon dioxide. The generated acidic gases such as HCl and arsenic trioxide react with calcium oxide to generate corresponding calcium salts, which reduce the impact of harmful components such as chlorine on the catalyst. The generated water is absorbed by calcium chloride, which can reduce the corrosion of chlorine to equipment and pipelines. The outlet of the gasifier is equipped with a gas-solid separation device and a pulse blowing device. The gas-solid separation device can use a gas settling chamber, which is used to remove larger solid particles in the gas. Its working principle is to use gravity sedimentation. By decelerating the airflow, solid particles are allowed to settle to the bottom of the settling chamber in the airflow, so that semi-coke, activated alumina and raw coal gas can be separated. A pulse blowing device is used to generate short and strong pulses through compressed air, which can effectively peel off fine powders and remove fine powders on the surface of semi-coke and activated alumina, thereby increasing the active sites of semi-coke and activated alumina. The raw coal gas can be discharged into the heat carrier heater through a pipeline, and the raw coal gas exchanges heat with the heat carrier in the heat carrier heater, transferring the heat energy in the gas to the heat carrier, thereby realizing effective recovery and utilization of heat energy. The gasifier The upper part is provided with an exhaust port connecting pipeline for discharging the raw coal gas generated by the gasifier into the heat carrier heater, and the lower part of the gasifier is provided with a discharge port; and a second riser connected to the discharge port of the gasifier and the feed port of the heat carrier heater through a pipeline, and the second riser can be a spiral elevator, and the second riser is used to transfer the semi-coke and activated alumina discharged from the gasifier to the heat carrier heater. The semi-coke discharged from the gasifier is the semi-coke generated in the coal powder gasification process, which can be used as a heat carrier and circulated to the heat carrier heater for use, saving resources, and can also be used to absorb pollutants such as sulfur dioxide. ;

[0008] Preferably, the mixer includes a mounting plate, and a conveying motor is fixedly mounted on the side of the mounting plate. The conveying motor is connected to the mounting plate by bolts to ensure the stability and firmness of the conveying motor during operation, and this connection method is convenient for disassembly and maintenance. A spiral conveying rod is installed at the output end of the conveying motor, and the spiral conveying rod is connected to the conveying motor through a coupling. The coupling can effectively reduce vibration and ensure the smooth rotation and transmission efficiency of the spiral conveying rod. A heating pipe is fixedly mounted on the inner wall of the furnace body, and the heating pipes are arranged at equal distances on the inner wall of the furnace body. The heating pipes are fixed on the inner wall of the furnace body by welding or flange connection. Such a connection method can ensure that the heating pipe can still work stably at high temperatures and is easy to maintain and replace. A channel matching the size of the spiral conveying rod is opened on the side of the partition, and the spiral conveying rod can evenly transport the mixture to the other side of the furnace body through the channel. The furnace body is fixedly mounted on the side of the mounting plate, and the top surface of the furnace body is connected with a heat pipe for connecting the discharge port of the heat carrier heater. The heat pipe is fixed by threaded or flange connection to ensure that the exhaust gas can be discharged smoothly and has good sealing. The bottom surface of the furnace body is connected with a discharge hopper, which is used to connect the feed port of the first lifting pipe. The discharge hopper is connected to the furnace body by welding to ensure the strength and sealing of the structure and adapt to the high temperature working environment. The top surface of the furnace body is connected with a feed box, and the top of the feed box is connected with a soil inlet pipe and a coal powder inlet pipe. The soil inlet pipe is used to connect the first storage tank, and the coal powder inlet pipe is used to connect the second storage tank. The soil inlet pipe and the coal powder inlet pipe are fixed by a threaded connection method, which is convenient for installation and disassembly to ensure smooth feeding of materials. A motor is fixedly installed on the top of the feed box, and the motor is fixedly connected to the feed box through a flange. The flange connection method can provide higher stability and precision, and adapt to the long-term operation of the motor. A rotating shaft is installed at the output end of the motor, and the rotating shaft is connected to the motor through a coupling. The coupling can absorb part of the vibration and protect the service life of the motor and the rotating shaft. A stirring blade is fixedly installed on the surface of the rotating shaft. The material of the stirring blade can be selected from high temperature and wear-resistant stainless steel, which has high strength and durability to ensure that it will not be damaged during the stirring process. The soil and coal powder can be fully mixed by the rotation of the stirring blades. The coal powder as an adsorbent can effectively adsorb organic pollutants in the soil and enhance the removal rate of pollutants. A crushing barrel is fixedly installed on the inner wall of the furnace body. The crushing barrel and the furnace body are fixed by bolt connection or snap connection, which is easy to disassemble and clean, ensuring that the mixture enters the crushing barrel smoothly.

[0009] Preferably, a cutter is fixedly installed on the surface of the rotating shaft near the bottom position, and the cutter is fixed to the rotating shaft by a thread, which is convenient for the removal and replacement of the cutter. The cutters are arranged in a circular shape on the surface of the rotating shaft, and can efficiently break up the mixture into small particles. Such a design can increase the surface area of ​​the mixture and further improve the thermal desorption effect. Filter holes are provided on the bottom surface of the crushing barrel, and the filter holes are evenly distributed on the bottom surface of the crushing barrel. The material of the filter holes can be stainless steel or wear-resistant cast iron to ensure long-term use without wear in high temperature and friction environment. A partition is fixedly installed on the inner wall of the furnace body, and the partition is fixed to the inner wall of the furnace body by welding. The presence of the partition helps to guide the flow of materials and optimize the heat conduction effect.

[0010] Preferably, the bottom surface of the crushing barrel is provided with a dredging mechanism, which includes a cylinder, which is fixedly mounted on the bottom surface of the crushing barrel, and the cylinder is fixed by welding to ensure durability in high temperature environments. A sliding rod is provided through the bottom end of the cylinder, and the sliding rod is slidably connected to the cylinder. The sliding rod adopts a bearing sliding method to ensure smooth sliding and less wear, thereby extending the service life. A bottom block is fixedly mounted on the bottom end of the sliding rod, and a vertical pole is fixedly mounted on the top surface of the bottom block. The material of the vertical pole can be selected from high temperature resistant materials, such as stainless steel, to ensure stability and durability in long-term use. An insert block is fixedly mounted on the top of the vertical pole, and the insert block is adapted to the size of the filter hole. When the filter hole is blocked, the insert block can be driven to be inserted into the filter hole for dredging by pushing the bottom block upwards. The dredging process does not require the disassembly of the equipment, and the operation is simple and effective, avoiding a complicated maintenance process.

[0011] Preferably, the inner wall of the discharge hopper is provided with an opening and closing mechanism, which includes a short rod, which is arranged through the inner wall of the discharge hopper, and the short rod is connected to the discharge hopper through a guide chute to ensure the smooth movement of the short rod. A closing plate is fixedly installed at one end of the short rod, and the closing plate is connected to the short rod through a hinge. The hinge connection method can provide a smooth opening and closing action to ensure that the closing plate can rotate flexibly. A short block is fixedly installed at the other end of the short rod, and a plug rod is arranged through the side of the short block, and the plug rod is slidably connected to the short block through a sliding bearing to ensure that the movement of the plug rod is smooth and high in precision. A pull block is fixedly installed at one end of the plug rod, and a tension spring is sleeved on the surface of the pull block. The tension spring is made of spring steel material, has high elasticity and durability, and ensures the stable performance of the tension spring in long-term use. One end of the tension spring is fixedly connected to the pull block, and the other end is fixedly connected to the short block to ensure that when the pull block is pulled, the tension spring can generate sufficient pull-back force. There are sockets A and B on the side of the discharge hopper. When the pull block is pulled, the insertion rod can be withdrawn from the socket A, and then the closing plate can be rotated 90 degrees around the hinge to open the discharge hopper for discharging operations. After releasing the pull block, the tension spring automatically pulls the insertion rod back to the socket B, and the closing plate is re-locked. The operation is convenient and safe, avoiding complicated manual operations.

[0012] The beneficial effects of the present invention are as follows: the soil blocks are crushed to less than 1 mm, the purpose of which is to crush the soil into small particles, which can increase the surface area of ​​contact between subsequent reactants and the soil and improve the efficiency of subsequent reactions; and 0-1 mm calcium oxide or calcium carbonate is mixed into the soil in proportion, the purpose of which is to allow the calcium oxide or calcium carbonate to generate corresponding compounds with chlorine and arsenic, reduce the gaseous chlorine and arsenic content in the soil, effectively absorb and fix pollutants, avoid the problem of easy re-release of pollutants during the treatment process, and thus improve the treatment efficiency and safety.

[0013] The beneficial effect of the present invention is that the mixer is used to fully mix the soil, calcium oxide, coal powder, activated alumina ceramic balls and coke therein, so that the soil is evenly distributed, solving the problem of uneven heat transfer in thermal desorption treatment.

[0014] The beneficial effect of the present invention is that the raw coal gas can be discharged into the heat carrier heater through a pipeline, and the raw coal gas exchanges heat with the heat carrier in the heat carrier heater, transferring the heat energy in the gas to the heat carrier, thereby realizing effective recovery and utilization of heat energy.

[0015] The beneficial effect of the present invention is that the soil and coal powder can be fully mixed through the rotation of the stirring blades, and the coal powder as an adsorbent can effectively adsorb organic pollutants in the soil and enhance the removal rate of pollutants.

[0016] The beneficial effect of the present invention is that the cutters are arranged in a circular shape on the surface of the rotating shaft, which can efficiently break up the mixture into small particles. Such a design can increase the surface area of ​​the mixture and further improve the thermal desorption effect.

[0017] The beneficial effect of the present invention is that when the treated soil needs to be discharged, it is only necessary to pull the pull block outward, and the pull block can then drive the insertion rod to leave the socket A, and then the closing plate can be rotated ninety degrees, at which time the discharge hopper is opened, and then the pull block is released, and then due to the tension of the tension spring, the tension spring pulls the pull block to move, and the pull block can then drive the insertion rod to insert into the socket B, at which time the closing plate can be limited, and when the closing plate needs to be closed, the above operation is repeated to allow the insertion rod to be inserted into the socket A to close the closing plate. The present invention controls the opening and closing of the discharge hopper by simply pulling the pull block. This mechanism greatly simplifies the operation process, making it easier for operators to master and perform the discharge operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the processing flow of the first embodiment of the present invention;

[0019] Figure 2 is a stereogram of a mixer in the present invention;

[0020] Figure 3 is a cross-sectional view of a mixer in the present invention;

[0021] Figure 4 is a cross-sectional view from a bottom up angle of the mixer of the present invention;

[0022] Figure 5 yes Figure 4 A partial enlarged view of the middle part;

[0023] Figure 6 is a bottom view of the mixer of the present invention;

[0024] Figure 7 yes Figure 6 A partial enlarged view of point B in the middle.

[0025] In the figure: 100, first storage tank; 200, second storage tank; 300, mixer; 400, heat carrier heater; 500, first lifting pipe; 600, gasifier; 700, second lifting pipe; 1, mounting plate; 2, furnace body; 3, discharge hopper; 4, feed box; 5, soil inlet pipe; 6, coal powder inlet pipe; 7, motor; 8, rotating shaft; 9, stirring blade; 10, crushing barrel; 11, cutter; 12, filter hole; 13, partition; 14, conveying motor; 15, spiral conveying rod; 16, heating pipe; 17, heat pipe; 18, cylinder; 19, sliding rod; 20, bottom block; 21, vertical rod; 22, plug block; 23, channel; 24, short rod; 25, closing plate; 26, short block; 27, plug rod; 28, pull block; 29, tension spring; 30, socket A; 31, socket B. DETAILED DESCRIPTION

[0026] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the contents of this specification. Each example may omit, replace or add various processes or components as needed. In addition, the features described relative to some examples may also be combined in other examples.

[0027] Embodiment 1

[0028] like Figures 1 to 7 As shown, the thermal desorption device for organic contaminated soil according to the embodiment of the present invention is particularly referred to Figure 1, including a first storage tank 100 for storing soil and calcium oxide. In the initial state, stones, plastics and other debris in the contaminated soil are first sorted out, and the soil blocks are crushed to less than 1 mm. The purpose is to crush the soil into small particles, which can increase the surface area of ​​contact between subsequent reactants and soil and improve the efficiency of subsequent reactions. Then, 0-1 mm calcium oxide or calcium carbonate is mixed into the soil in proportion. The purpose is to allow calcium oxide or calcium carbonate to generate corresponding compounds with chlorine and arsenic, reduce the gas phase chlorine and arsenic content in the soil, effectively absorb and fix pollutants, and avoid the problem of easy re-release of pollutants during the treatment process, thereby improving the treatment efficiency and safety. Then, the mixture of calcium oxide and soil is stored in the first storage tank 100; a second storage tank 200 for storing coal powder; and a second storage tank 200 connected to the discharge port of the first storage tank 100 and the discharge port of the second storage tank 200 through pipelines. The mixer 300 of the material inlet, the material outlet of the first storage tank 100 and the material outlet of the second storage tank 200 are both connected to the material inlet of the mixer 300, the first storage tank 100 can add soil and calcium oxide into the mixer 300, and the second storage tank 200 can add coal powder into the mixer 300; a heat carrier heater 400 for adding heat carrier into the mixer 300 through a pipeline, the heat carrier of the heat carrier heater 400 can be activated alumina ceramic balls and coke, the mixer 300 is used to fully mix the soil, calcium oxide, coal powder, activated alumina ceramic balls and coke inside it, so that the soil is evenly distributed, solving the problem of uneven heat transfer in thermal desorption treatment; a first riser 500 connected to the mixer 300, the material outlet of the mixer 300 is connected to the material inlet of the first riser 500 through a pipeline;The gasifier 600 is connected to the first riser 500. The first riser 500 is used to transfer the mixture in the mixer 300 to the gasifier 600. The first riser 500 can be a spiral elevator. The discharge port of the first riser 500 is connected to the feed port of the gasifier 600 through a pipeline. The gasifier 600 can be a graded gasifier. The graded gasifier is divided into three chambers from top to bottom, namely, a drying chamber, a retorting chamber, and a cooling chamber. By setting the graded gasifier, the coal powder is gasified in the retorting chamber of the graded gasifier, and the organic matter on the soil absorbs heat, gasifies and precipitates and reacts with oxygen, wherein the pollutants such as arsenic and chlorine react with oxygen. The calcium chloride reaction generates corresponding oxides. The soil temperature in the gasifier 600 rises to above the boiling point of toluene, chlorobenzene, etc., escapes from the soil surface, and is oxidized into water and carbon dioxide. The generated acidic gases such as HCl and arsenic trioxide react with calcium oxide to generate corresponding calcium salts, which reduce the impact of harmful components such as chlorine on the catalyst. The generated water is absorbed by calcium chloride, which can reduce the corrosion of chlorine to equipment and pipelines. The outlet of the gasifier 600 is equipped with a gas-solid separation device and a pulse blowing device. The gas-solid separation device can use a gas settling chamber. The gas settling chamber is used to remove larger solid particles in the gas. Its working principle is to use gravity sedimentation to decelerate the airflow. , so that the solid particles settle to the bottom of the settling chamber in the air flow, and the semi-coke, activated alumina and raw coal gas can be separated. The pulse blowing device is used to generate short and strong pulses through compressed air, which can effectively peel off fine powders and remove fine powders on the surface of semi-coke and activated alumina, and can increase the active sites of semi-coke and activated alumina. Among them, the raw coal gas can be discharged into the heat carrier heater 400 through a pipeline. The raw coal gas exchanges heat with the heat carrier in the heat carrier heater 400, and the heat energy in the gas is transferred to the heat carrier, thereby realizing the effective recovery and utilization of heat energy. The upper part of the gasifier 600 is provided with an exhaust port connecting pipeline for gasifying The raw coal gas produced by the gasifier 600 is discharged into the heat carrier heater 400. The lower part of the gasifier 600 is provided with a discharge port; and a second riser 700 connected to the discharge port of the gasifier 600 and the feed port of the heat carrier heater 400 through a pipeline. The second riser 700 can be a spiral elevator. The second riser 700 is used to transfer the semi-coke and activated alumina discharged from the gasifier 600 to the heat carrier heater 400. The semi-coke discharged from the gasifier 600 is the semi-coke generated during the coal powder gasification process. It can be used as a heat carrier and circulated to the heat carrier heater 400 for use, saving resources, and can also be used to absorb pollutants such as sulfur dioxide. ;

[0029] like Figures 2 to 7As shown, in contrast to Example 2, another embodiment of the present invention is as follows: the mixer 300 includes a mounting plate 1, and a conveying motor 14 is fixedly mounted on the side of the mounting plate 1. The conveying motor 14 is connected to the mounting plate 1 by bolts to ensure the stability and firmness of the conveying motor 14 during operation, and this connection method is convenient for disassembly and maintenance. A spiral conveying rod 15 is installed at the output end of the conveying motor 14, and the spiral conveying rod 15 is connected to the conveying motor 14 through a coupling, and the coupling can effectively reduce vibration and ensure the smooth rotation and transmission efficiency of the spiral conveying rod 15. A heating tube 16 is fixedly mounted on the inner wall of the furnace body 2, and the heating tube 16 is arranged at equal distances on the inner wall of the furnace body 2. The heating tube 16 is fixed on the inner wall of the furnace body 2 by welding or flange connection. Such a connection method can ensure that the heating tube 16 can still work stably at high temperatures and is easy to maintain and replace. A channel 23 that is adapted to the size of the spiral conveying rod 15 is opened on the side of the partition 13, and the spiral conveying rod 15 can evenly convey the mixture to the other side of the furnace body 2 through the channel 23. The furnace body 2 is fixedly mounted on the side of the mounting plate 1. The top surface of the furnace body 2 is connected with a heat pipe 17 for connecting the discharge port of the heat carrier heater. The heat pipe 17 for connecting the heat carrier heater 400 is fixed by threaded or flanged connection to ensure that the exhaust gas can be discharged smoothly and has good sealing. The bottom surface of the furnace body 2 is connected with a discharge hopper 3, which is used to connect the feed port of the first lifting pipe 500. The discharge hopper 3 is connected to the furnace body 2 by welding to ensure the strength and sealing of the structure and adapt to high-temperature working environment. The top surface of the furnace body 2 is connected with a feed box 4, and the top of the feed box 4 is connected with a soil inlet pipe 5 and a coal powder inlet pipe 6. The soil inlet pipe 5 is used to connect the first storage tank 100, and the coal powder inlet pipe 6 is used to connect the second storage tank 200. The soil inlet pipe 5 and the coal powder inlet pipe 6 are fixed by threaded connection, which is convenient for installation and disassembly to ensure smooth feeding of materials. A motor 7 is fixedly installed on the top of the feed box 4, and the motor 7 is fixedly connected to the feed box 4 through a flange. The flange connection method can provide higher stability and precision, and is suitable for the long-term operation of the motor 7. A rotating shaft 8 is installed on the output end of the motor 7, and the rotating shaft 8 is connected to the motor 7 through a coupling. The coupling can absorb part of the vibration and protect the service life of the motor 7 and the rotating shaft 8. A stirring blade 9 is fixedly installed on the surface of the rotating shaft 8. The material of the stirring blade 9 can be selected from high-temperature resistant and wear-resistant stainless steel, which has high strength and durability to ensure that it will not be damaged during the stirring process. Through the rotation of the stirring blade 9, the soil and coal powder can be fully mixed. The coal powder can effectively absorb organic pollutants in the soil as an adsorbent and enhance the removal rate of pollutants. A crushing barrel 10 is fixedly installed on the inner wall of the furnace body 2. The crushing barrel 10 is fixed to the furnace body 2 by bolt connection or snap connection, which is easy to disassemble and clean, and ensures that the mixture enters the crushing barrel 10 smoothly.

[0030] like Figures 3 to 5As shown, a cutter 11 is fixedly installed on the surface of the rotating shaft 8 near the bottom position, and the cutter 11 is fixed on the rotating shaft 8 by a thread, which is convenient for the removal and replacement of the cutter 11. The cutters 11 are arranged in a circular shape on the surface of the rotating shaft 8, which can efficiently break up the mixture and break it into small particles. Such a design can increase the surface area of ​​the mixture and further improve the thermal desorption effect. The bottom surface of the crushing barrel 10 is provided with filter holes 12, and the filter holes 12 are evenly distributed on the bottom surface of the crushing barrel 10. The material of the filter holes 12 can be stainless steel or wear-resistant cast iron to ensure long-term use without wear under high temperature and friction environment. The inner wall of the furnace body 2 is fixedly installed with a partition 13, and the partition 13 is fixed to the inner wall of the furnace body 2 by welding. The existence of the partition 13 helps to guide the flow of materials and optimize the heat conduction effect.

[0031] like Figures 4 to 5 As shown, the bottom surface of the crushing barrel 10 is provided with a dredging mechanism, which includes a cylinder 18, which is fixedly mounted on the bottom surface of the crushing barrel 10, and is fixed by welding to ensure durability in a high temperature environment. A sliding rod 19 is provided through the bottom end of the cylinder 18, and the sliding rod 19 is slidably connected to the cylinder 18. The sliding rod 19 adopts a bearing sliding method to ensure smooth sliding and less wear, thereby extending the service life. A bottom block 20 is fixedly mounted on the bottom end of the sliding rod 19, and a vertical rod 21 is fixedly mounted on the top surface of the bottom block 20. The material of the vertical rod 21 can be selected from high temperature resistant materials, such as stainless steel, to ensure stability and durability in long-term use. An insert block 22 is fixedly mounted on the top of the vertical rod 21, and the insert block 22 is adapted to the size of the filter hole 12. When the filter hole 12 is blocked, the insert block 22 can be driven to be inserted into the filter hole 12 for dredging by pushing the bottom block 20 upwards. The dredging process does not require the disassembly of the equipment, and the operation is simple and effective, avoiding a complicated maintenance process.

[0032] like Figure 6 to Figure 7As shown, the inner wall of the discharge hopper 3 is provided with an opening and closing mechanism, which includes a short rod 24, which is arranged through the inner wall of the discharge hopper 3, and the short rod 24 is connected to the discharge hopper 3 by a guide slide groove to ensure the smooth movement of the short rod 24. A closing plate 25 is fixedly installed at one end of the short rod 24, and the closing plate 25 is connected to the short rod 24 by a hinge. The hinge connection method can provide a smooth opening and closing action, ensuring that the closing plate 25 can rotate flexibly. A short block 26 is fixedly installed at the other end of the short rod 24, and a plug rod 27 is arranged through the side of the short block 26. The plug rod 27 is slidably connected to the short block 26 by a sliding bearing, ensuring that the movement of the plug rod 27 is smooth and high in precision. A pull block 28 is fixedly installed at one end of the plug rod 27, and a tension spring 29 is sleeved on the surface of the pull block 28. The tension spring 29 is made of spring steel material, has high elasticity and durability, and ensures the stable performance of the tension spring 29 in long-term use. One end of the tension spring 29 is fixedly connected to the pull block 28, and the other end is fixedly connected to the short block 26, ensuring that when the pull block 28 is pulled, the tension spring 29 can generate sufficient pullback force. The side of the discharge hopper 3 is provided with a socket A30 and a socket B31. When the pull block 28 is pulled, the insertion rod 27 can be withdrawn from the socket A30, and then the closing plate 25 can be rotated 90 degrees around the hinge to open the discharge hopper 3 for discharging. After the pull block 28 is released, the tension spring 29 automatically pulls the insertion rod 27 back to the socket B31, and the closing plate 25 is re-locked. The operation is convenient and safe, avoiding complicated manual operations.

[0033] Specifically, the soil is introduced through the soil inlet pipe 5, and at the same time, the stones, plastics and other debris in the soil are pre-sorted, the soil blocks in the soil are crushed to less than 1 mm, and then 0-1 mm calcium oxide or calcium carbonate is proportionally added to the crushed soil, the purpose is to generate corresponding compounds with chlorine and arsenic, reduce the gas phase chlorine and arsenic content, and then enter the coal powder through the coal powder inlet pipe 6, and then the motor 7 drives the shaft 8 to rotate, and the shaft 8 can then drive the stirring blade 9 to stir and mix the coal powder and the soil. The coal powder can absorb pollutants, and then the mixed mixture falls into the crushing barrel 10. At this time, when the shaft 8 rotates, it can drive the cutter 11 to rotate, and the mixture can be broken by the cutter 11. At this time, the mixture can be broken into small particles, thereby increasing the surface area of ​​the particles, and then Improve the thermal desorption effect. After being crushed, it falls into the furnace body 2 through the filter hole 12, and then is heated by the heating tube 16. Then, the conveying motor 14 drives the screw conveying rod 15 to rotate. At this time, the screw conveying rod 15 can convey the mixture to the other side of the furnace body 2 through the channel 23. The present invention mixes the coal powder with the contaminated soil. The coal powder can be used as an adsorbent to absorb organic pollutants in the soil, which can effectively improve the removal rate of pollutants. Because the coal powder has high surface activity and adsorption capacity, at the same time, the coal powder and the soil are evenly mixed by the stirring blade 9, and then the mixture is broken into small particles by the cutter 11. When the filter hole 12 is blocked, the staff only needs to push the bottom block 20 upwards when disassembling the furnace body 2 for maintenance, and the bottom block 20 then drives the slide The rod 19 slides in the cylinder 18, and the bottom block 20 drives the vertical rod 21 to move upward. The vertical rod 21 can then drive the plug block 22 to insert into the filter hole 12, and the filter hole 12 can be unblocked. When the bottom block 20 is released, due to the effect of gravity, the bottom block 20 naturally moves downward to reset. In the present invention, when the filter hole 12 is blocked, the filter hole 12 can be directly unblocked by simply pushing the bottom block 20 upward, avoiding complicated disassembly steps, making maintenance faster and more direct. At the same time, when unblocking, the operator does not need to use additional tools or equipment for maintenance, which reduces maintenance costs and reduces the complexity of operation. It allows the operator to respond quickly and deal with it immediately when the filter hole 12 is found to be blocked, which helps to prevent the equipment from being blocked. The bottom block 20 can be reset by natural downward movement due to gravity after being released, which means that the entire dredging process can automatically complete the start and end operations without additional manual intervention, thereby improving the convenience and safety of operation. When the treated soil needs to be discharged, it is only necessary to pull the pull block 28 outward, and the pull block 28 can then drive the insertion rod 27 to leave the socket A30, and then the closing plate 25 can be rotated ninety degrees. At this time, the discharge hopper 3 is opened, and then the pull block 28 is released. Then, due to the tension of the tension spring 29, the tension spring 29 pulls the pull block 28 to move, and the pull block 28 can then drive the insertion rod 27 to insert into the socket B31, at this time, the closing plate 25 can be limited, and when the closing plate 25 needs to be closed,Repeat the above operation to insert the plug rod 27 into the socket A30 to close the closing plate 25. The present invention controls the opening and closing of the discharge hopper 3 by simply pulling the pull block 28. This mechanism greatly simplifies the operation process and makes it easier for operators to master and perform the discharge operation. The tension spring 29 in the design can automatically pull back the pull block 28, so that the plug rod 27 is repositioned to the socket B31, which simplifies the operation and reduces the labor intensity of the operator. The user does not need to manually reposition the components, thereby enhancing the convenience of use and the safety of the equipment. The rotation and positioning of the closing plate 25 is achieved through the combination of the physical plug rod 27 and the socket. This mechanical locking method is more reliable than electronic or pneumatic control, especially in high temperature or harsh working environments, which reduces the equipment failure rate.

[0034] The above describes an embodiment of the present embodiment, but the present embodiment is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present embodiment, ordinary technicians in this field can also make many forms, all of which are within the protection of the present embodiment.

Claims

1. A thermal desorption device for organic contaminated soil, characterized in that: include A first storage tank (100) for storing soil and calcium oxide; A second storage tank (200) for storing pulverized coal; a mixer (300) connected to a discharge port of a first storage tank (100) and a discharge port of a second storage tank (200), wherein the first storage tank (100) is used to add soil and calcium oxide into the mixer (300), and the second storage tank (200) is used to add coal powder into the mixer (300); A heat carrier heater (400) for adding heat carrier into the mixer (300); A first riser (500) connected to the mixer (300), wherein the outlet of the mixer (300) is connected to the inlet of the first riser (500); a gasifier (600) connected to a first riser (500), the first riser (500) being used to transfer the mixture in the mixer (300) into the gasifier (600), the discharge port of the first riser (500) being connected to the feed port of the gasifier (600), the upper portion of the gasifier (600) being provided with an exhaust port communicating pipeline for discharging the raw coal gas generated by the gasifier (600) into the heat carrier heater (400), and the lower portion of the gasifier (600) being provided with a discharge port; and A second lifting pipe (700) connected to the discharge port of the gasifier (600) and the feed port of the heat carrier heater (400) is used to transfer the semi-coke and activated alumina discharged from the gasifier (600) to the heat carrier heater (400); the mixer (300) comprises a mounting plate (1), a furnace body (2) is fixedly mounted on the side of the mounting plate (1), the bottom surface of the furnace body (2) is connected to a discharge hopper (3), the discharge hopper (3) is used to be connected to the feed port of the first lifting pipe (500), the top surface of the furnace body (2) is connected to a feed box (4), the top of the feed box (4) is connected to a soil inlet pipe (5) and a coal powder inlet pipe (6), the soil inlet pipe (5) is used to be connected to the first storage tank (100), the coal powder inlet pipe (6) is used to be connected to the second storage tank (200), the top of the feed box (4) is fixedly mounted with a motor (7), the output end of the motor (7) A rotating shaft (8) is installed, and a stirring blade (9) is fixedly installed on the surface of the rotating shaft (8); a crushing barrel (10) is fixedly installed on the inner wall of the furnace body (2); a cutting knife (11) is fixedly installed on the surface of the rotating shaft (8) near the bottom end; a filter hole (12) is opened on the bottom surface of the crushing barrel (10); a partition plate (13) is fixedly installed on the inner wall of the furnace body (2); and the cutting knives (11) are arranged in a circular shape on the surface of the rotating shaft (8); a dredging mechanism is arranged on the bottom surface of the crushing barrel (10), and the dredging mechanism comprises a cylinder (18), and the cylinder (18) is fixedly installed on the bottom surface of the crushing barrel (10); a sliding rod (19) is penetrated at the bottom end of the cylinder (18); a bottom block (20) is fixedly installed at the bottom end of the sliding rod (19); a vertical rod (21) is fixedly installed on the top surface of the bottom block (20); and an insert block (22) is fixedly installed on the top end of the vertical rod (21).

2. The thermal desorption device for organic contaminated soil according to claim 1, characterized in that: The filter holes (12) are evenly distributed on the bottom surface of the crushing barrel (10).

3. The thermal desorption device for organic contaminated soil according to claim 2, characterized in that: The top surface of the furnace body (2) is connected to a heat pipe (17) for connecting to the discharge port of the heat carrier heater (400).

4. The thermal desorption device for organic contaminated soil according to claim 1, characterized in that: The insert block (22) is adapted to the size of the filter hole (12), and the slide rod (19) is slidably connected to the cylinder (18).

5. The thermal desorption device for organic contaminated soil according to claim 1, characterized in that: A conveying motor (14) is fixedly mounted on the side of the mounting plate (1), a screw conveying rod (15) is mounted on the output end of the conveying motor (14), a heating tube (16) is fixedly mounted on the inner wall of the furnace body (2), the heating tubes (16) are arranged at equal distances on the inner wall of the furnace body (2), and a channel (23) of a size matching that of the screw conveying rod (15) is opened on the side of the partition plate (13).

6. The thermal desorption device for organic contaminated soil according to claim 1, characterized in that: The inner wall of the discharge hopper (3) is provided with an opening and closing mechanism, and the opening and closing mechanism comprises a short rod (24), the short rod (24) is arranged through the inner wall of the discharge hopper (3), a closing plate (25) is fixedly mounted on one end of the short rod (24), a short block (26) is fixedly mounted on the other end of the short rod (24), an insertion rod (27) is arranged through the side of the short block (26), a pulling block (28) is fixedly mounted on one end of the insertion rod (27), a tension spring (29) is sleeved on the surface of the insertion rod (27), and a plug hole A (30) and a plug hole B (31) are provided on the side of the discharge hopper (3).

7. The thermal desorption device for organic contaminated soil according to claim 6, characterized in that: The insertion rod (27) is slidably connected to the short block (26).

8. The thermal desorption device for organic contaminated soil according to claim 7, characterized in that: One end of the tension spring (29) is fixedly connected to the pull block (28), and the other end of the tension spring (29) is fixedly connected to the short block (26).

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