CN115608758B - Continuous soil thermal desorption system - Google Patents
Continuous soil thermal desorption system Download PDFInfo
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- CN115608758B CN115608758B CN202211099595.1A CN202211099595A CN115608758B CN 115608758 B CN115608758 B CN 115608758B CN 202211099595 A CN202211099595 A CN 202211099595A CN 115608758 B CN115608758 B CN 115608758B
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- thermal desorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/005—Extraction of vapours or gases using vacuum or venting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
Abstract
The invention discloses a continuous soil thermal desorption system, which comprises a cylinder assembly, a gas treatment assembly and a transmission assembly, wherein the cylinder assembly is arranged on the cylinder assembly; the cylinder component comprises a cylinder and a conveying shaft; the cylinder is hollow to form a closed thermal desorption cavity, a soil inlet and a soil outlet which are communicated with the thermal desorption cavity are formed in the cylinder, a heating assembly for heating the soil in the thermal desorption cavity is arranged on the cylinder between the soil inlet and the soil outlet, and the gas treatment assembly is communicated with the thermal desorption cavity in the area where the heating assembly is located; the conveying shaft is arranged in the thermal desorption cavity, one end of the conveying shaft extends out of the thermal desorption cavity and is in transmission connection with the transmission assembly, and the volume of the thermal desorption cavity corresponding to the area where the heating assembly is located is larger than the volume of the areas on two sides of the heating assembly. The invention has simple integral structure, can effectively improve the soil desorption rate and the thermal desorption effect, leads the soil thermal desorption to be more thorough and can effectively prevent the toxic gas from leaking.
Description
Technical Field
The invention relates to the technical field of soil remediation, in particular to a continuous soil thermal desorption system.
Background
The thermal desorption treatment technology is a common organic contaminated soil remediation technology at present, and is divided into in-situ treatment and ex-situ treatment. The in-situ treatment needs less equipment and has small site disturbance, but the treatment efficiency is low, the energy consumption is relatively high, and the repair effect is poor. The ectopic treatment transfers the polluted soil to a special site for treatment through excavation, the treatment efficiency is high, the repair effect is good, but a large amount of time and funds need to be invested for one-time site construction every time, and the waste is serious. The heterotopic thermal desorption technology is divided into a continuous type and an intermittent type, the intermittent type thermal desorption generally adopts a method of piling and sealing indirect thermal desorption, the demand field is large, the energy consumption is high, so that the intermittent type thermal desorption technology is difficult to popularize and develop, and the continuous type thermal desorption technology becomes the main development direction of the thermal desorption technology at present.
In the prior art, CN 110548759B discloses a rotary kiln type continuous soil thermal desorption device, the rotary kiln designed by the invention adopts an inner-outer layer structure, and has an inner cavity and an outer cavity, soil to be desorbed is placed in the outer cavity, the inner cavity provides high temperature for a combustion cavity, and high temperature tail gas after the inner cavity is combusted is introduced into the outer cavity to complete secondary heating, so that desorption efficiency and gas utilization rate are improved. The method belongs to direct thermal desorption, secondary pollution is easily caused when fuel gas is in direct contact with pollutants, and the feed inlet is of an open structure, so that toxic gas overflows from the feed inlet to cause pollution.
In the prior art, CN 217121257U discloses an adopt device of indirect thermal desorption of electrical heating, adopt the electrical heating mode to heat desorption section of thick bamboo, transmit for soil again, soil is discharged by shaftless screw conveyer after the high temperature thermal desorption, the device still forms a complete set and is provided with tail gas processing system, water treatment system, the high temperature soil after the device handles directly discharges, energy utilization is not high, tail gas processing system relies on the negative pressure to take out the toxic gas that generates in the desorption section of thick bamboo simultaneously, the atmospheric pressure balancing unit is not set up, can remain a small amount of toxic gas in the soil and lead to the desorption incomplete.
The soil thermal desorption belongs to the high energy consumption industry, the problem of how to improve the energy utilization efficiency, simplify the process flow and improve the desorption rate is the current urgent need to be solved, and meanwhile, the technical problems of integration, miniaturization and light weight of the soil thermal desorption equipment, the problem of how to solve the toxic gas residue faced by negative pressure extraction and the problem of utilization of high-temperature soil waste heat are also the current problems.
Based on the defects and technical difficulties of the prior art, the invention is particularly provided.
Disclosure of Invention
The invention aims to provide a continuous soil thermal desorption system which is simple in structure, capable of effectively improving the soil desorption rate and the thermal desorption effect, more thorough in soil thermal desorption and capable of effectively preventing toxic gas from leaking.
The purpose of the invention is mainly realized by the following technical scheme: the continuous soil thermal desorption system comprises a cylinder assembly, a gas treatment assembly and a transmission assembly; the cylinder component comprises a cylinder and a conveying shaft; the cylinder body is provided with a soil inlet and a soil outlet which are communicated with the thermal desorption cavity, a heating assembly for heating the soil in the thermal desorption cavity is arranged between the soil inlet and the soil outlet, and the gas treatment assembly is communicated with the thermal desorption cavity in the area where the heating assembly is located; the conveying shaft is arranged in the thermal desorption cavity, one end of the conveying shaft extends out of the thermal desorption cavity and is in transmission connection with the transmission assembly, and the volume of the thermal desorption cavity corresponding to the area where the heating assembly is located is larger than the volume of the areas on two sides of the heating assembly.
Based on above technical scheme, barrel inner wall or transport the axle and be reducing structure, the heat desorption chamber is based on the reducing structure of barrel inner wall or transport axle forms the reducing cavity body structure that the volume that corresponds the regional volume that heating element place is greater than the regional volume in heating element both sides.
Based on the technical scheme, the conveying shaft is of a reducing structure; the conveying shaft sequentially forms a first shaft body section, a second shaft body section and a third shaft body section, the second shaft body section is located in the area where the heating assembly is located, and the shaft diameter of the second shaft body section is smaller than the shaft diameters of the first shaft body section and the third shaft body section.
Based on above technical scheme, carry the axle and still include the fourth shaft body section that is located soil inlet region, first shaft body section, second shaft body section, third shaft body section and fourth shaft body section form in order, fourth shaft body section one end stretch out to the thermal desorption chamber outside with transmission assembly transmission is connected, just the shaft diameter of fourth shaft body section is less than the shaft diameter of third shaft body section.
Based on the above technical solution, the first shaft body segment and the third shaft body segment have the same shaft diameter, and the second shaft body segment and the fourth shaft body segment have the same shaft diameter.
Based on above technical scheme, smooth transition is between first shaft body section, second shaft body section, third shaft body section and the fourth shaft body section, and the transition surface inclination between third shaft body section and the fourth shaft body section is less than the transition surface inclination of second shaft body section and third shaft body section.
Based on above technical scheme, first shaft body section, second shaft body section and third shaft body section surface all are provided with temperature sensor.
Based on the technical scheme, the conveying shaft is a spiral conveying shaft, and the spiral of the conveying shaft is in clearance fit with the inner wall of the cylinder body.
Based on above technical scheme, the surface that the delivery shaft is located the second shaft body section still is provided with first stirring rake teeth.
Based on the technical scheme, the cylinder comprises an outer shell and an inner shell, the inner shell is arranged in the outer shell, and the heat desorption cavity is formed in the inner shell; the interval sets up and forms confined heating chamber between shell body and the interior casing, heating element sets up in the heating chamber, just second shaft section is located the heating chamber inboard.
Based on the technical scheme, a closed preheating cavity and a closed cooling cavity are formed between the outer shell and the inner shell respectively; the preheating cavity, the heating cavity and the cooling cavity are sequentially arranged and are mutually independent; the preheating cavity and the cooling cavity are internally provided with heat exchange assemblies, the soil inlet is arranged on the cylinder body of the area where the preheating cavity is located, and the soil outlet is arranged on the cylinder body of the area where the cooling cavity is located; the first shaft body section is located in a heat desorption cavity of an area corresponding to the cooling cavity, and the third shaft body section is located in a heat desorption cavity of an area corresponding to the preheating cavity.
Based on the technical scheme, the heat exchange assemblies in the preheating cavity and the cooling cavity are communicated through a pipeline to form a heat exchange circulating system.
Based on the technical scheme, the heat exchange assemblies in the preheating cavity and the cooling cavity are both heat exchangers, the outlet end of the heat exchanger in the preheating cavity is communicated with the inlet end pipeline of the heat exchanger in the cooling cavity, and the inlet end of the heat exchanger in the preheating cavity is communicated with the outlet end pipeline of the heat exchanger in the cooling cavity.
Based on the technical scheme, the two ends of the cylinder body respectively seal the heat desorption cavity through the fixed cylinder cover and the movable cylinder cover; one end of the conveying shaft penetrates through the fixed cylinder cover and extends out of the thermal desorption cavity to be in transmission connection with the transmission assembly; the other end of the conveying shaft penetrates through the movable cylinder cover and is positioned; the movable barrel cover can move under the action of soil in the thermal desorption cavity so as to conduct or isolate the thermal desorption cavity and the soil outlet.
Based on above technical scheme, the tip that carries the axle to run through movable cover is still recessed to be formed with the hole, is connected with the back shaft through the bearing in the hole, and the back shaft stretches out the hole and rotates and support on the support, the support is located the movable cover outside.
Based on above technical scheme, the movable barrel cover includes lid and elastic element, and elastic element one end is connected with the barrel, and the other end is connected in the lid, the lid can be based on elastic element's elastic force pressure tight seal in order to completely cut off heat desorption chamber and soil export at barrel tip, or remove under the inside soil pressure effect in heat desorption chamber in order to switch on heat desorption chamber and soil export.
Based on above technical scheme, fixed cover and activity cover are located and all are provided with the sealing washer in the transport axle department of running through.
Based on the technical scheme, the side wall of the fixed cylinder cover, which is positioned on one side of the thermal desorption cavity, is also provided with a pressure sensor.
Based on the technical scheme, the cylinder is provided with an air exhaust port and a gas return port which are communicated with the thermal desorption cavity; the air pumping port is arranged above the cylinder body in the area where the heating assembly is located and is close to one side of the soil outlet; the gas backflow port is arranged below the cylinder body in the area where the heating assembly is located and close to one side of the soil inlet; the gas pumping port pipeline is communicated with a gas inlet end of the gas processing assembly, and the gas return port pipeline is communicated with a gas outlet end of the gas processing assembly.
Based on the technical scheme, a first one-way valve is arranged on the gas outlet end of the gas treatment component, the gas return port pipeline is communicated between the first one-way valve and the gas treatment component, and a second one-way valve is arranged on the pipeline of the gas return port communicated with the gas treatment component; the cracking pressure of the second one-way valve is larger than that of the first one-way valve.
Based on the technical scheme, the soil inlet is also connected with a feeding mechanism; the feeding mechanism comprises a feeding hopper communicated with a soil inlet, a spiral conveying mechanism is arranged in the feeding hopper, and a second stirring rake tooth and a material height sensor are further arranged on the spiral conveying mechanism.
Based on above technical scheme, the barrel outer wall is provided with thermal-insulated heat preservation, the barrel inside wall that the heat desorption chamber corresponds all sets up the wearing layer with carry the off-axial wall, it still is provided with thermal-insulated wear-resisting coating to carry the off-axial to be located the wearing layer skin.
Based on above technical scheme, heating element is electromagnetic induction coil or gas combustion nozzle.
Based on above technical scheme, still include the base, barrel subassembly and transmission assembly all set up on the base.
Based on above technical scheme, still include controlling means, controlling means and transmission assembly, gaseous processing subassembly and the equal electric connection of heating element.
Compared with the prior art, the invention has the following beneficial effects:
1. the volume of the area of the thermal desorption cavity corresponding to the heating assembly is larger than the volume of the areas on the two sides of the heating assembly, so that the soil is extruded in the thermal desorption cavities on the two sides of the heating assembly, the thermal desorption cavity entering the area of the heating assembly becomes loose, the heating efficiency of the soil can be increased, the thermal desorption rate of the soil under the action of the heating assembly is improved, the soil specific desorption effect is good, and the generated toxic gas can be completely isolated in the area of the heating assembly and extracted by the communicated gas treatment assembly for treatment due to the fact that the thermal desorption cavities on the two sides of the heating assembly are extruded and isolated by the soil, and further the residual and leakage of the toxic gas are reduced.
2. The thermal desorption cavity is divided into a plurality of areas with different volumes by utilizing the reducing structure of the conveying shaft, and soil is limited and extruded by the cylinder and the conveying shaft integrally, so that the thermal desorption cavity in the area where the heating assembly is located can be isolated and sealed by changing the compactness of the soil, the desorption rate is improved, the toxic gas is prevented from leaking, and the environmental pollution caused by the leakage of the polluted gas is avoided.
3. According to the invention, the preheating cavity, the heating cavity and the cooling cavity are sequentially arranged to respectively realize the preheating, heating and cooling of soil, and the preheating cavity and the cooling cavity are communicated through a pipeline to form a heat exchange circulating system, so that the soil heat after cold desorption can be used for preheating the soil to be desorbed, the heating speed and the energy utilization efficiency are improved, the heating energy consumption and the cost are effectively reduced, and the purposes of energy conservation and emission reduction are achieved.
4. According to the gas treatment component, the first one-way valve and the second one-way valve are arranged, so that when the absorption pressure of the polluted gas in the thermal desorption cavity of the area where the heating component is located is low, the treated oxygen-free clean gas can be filled into the soil by opening the second one-way valve, the emission of the polluted gas in the soil is accelerated, and when a large amount of toxic gas volatilizes in the soil, so that the gas pressure in the thermal desorption cavity of the area where the heating component is located is increased, the second one-way valve is closed, the toxic gas is ensured to be completely extracted, and the thermal desorption effect of the soil is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic view of the structure of the present invention;
FIG. 2 is a structural elevation view of the present invention;
FIG. 3 is a left side view of the structure of the present invention;
FIG. 4 is a right side view of the structure of the present invention;
FIG. 5 is a cross-sectional view of the structure of the present invention, with the arrows showing the direction of the soil;
FIG. 6 is a schematic view of the structure of the transport shaft;
FIG. 7 is a graph showing the change in soil compaction in different areas of the cylinder, with arrows indicating the direction of the soil;
the numbers in the figures are indicated as:
1. a gas processing assembly; 2. a transmission assembly; 3. a barrel; 4. a delivery shaft; 5. a thermal desorption chamber; 6. a soil inlet; 7. a soil outlet; 8. a heating assembly; 9. a temperature sensor; 10. a first stirring rake tooth; 11. an outer housing; 12. an inner housing; 13. a heating cavity; 14. a preheating chamber; 15. a cooling chamber; 16. a heat exchange assembly; 17. fixing the cylinder cover; 18. a cover body; 19. an elastic element; 20. an inner bore; 21. a bearing; 22. a support shaft; 23. a support; 25. an air extraction opening; 26. a gas return port; 27. a first check valve; 28. a second one-way valve; 29. a feed hopper; 30. a screw conveying mechanism; 31. a second stirring rake tooth; 32. a material height sensor; 33. a base; 34. and a control device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
As shown in fig. 1-5, the continuous thermal soil desorption system of the present embodiment mainly includes a cylinder assembly, a gas treatment assembly 1 and a transmission assembly 2; the cylinder component comprises a cylinder 3 and a conveying shaft 4; the cylinder 3 is hollow to form a closed thermal desorption cavity 5, the cylinder 3 is provided with a soil inlet 6 and a soil outlet 7 which are communicated with the thermal desorption cavity 5, the cylinder 3 between the soil inlet 6 and the soil outlet 7 is provided with a heating assembly 8 for heating soil in the thermal desorption cavity 5, and the gas treatment assembly 1 is communicated with the thermal desorption cavity 5 in the area where the heating assembly 8 is located; the conveying shaft 4 is arranged in the thermal desorption cavity 5, one end of the conveying shaft extends out of the thermal desorption cavity 5 to be in transmission connection with the transmission assembly 2, and the volume of the area, corresponding to the heating assembly 8, of the thermal desorption cavity 5 is larger than the volume of the areas on two sides of the heating assembly 8.
In this embodiment, contaminated soil enters the barrel 3 through the soil inlet 6, the conveying shaft 4 conveys the soil to the thermal desorption cavity 5 and discharges the soil from the soil outlet 7 under the transmission of the transmission assembly 2, when the soil passes through the thermal desorption cavity 5 in the area of the heating assembly 8, thermal desorption is performed under the heating action of the heating assembly 8, the generated toxic gas is extracted and processed through the gas treatment assembly 1, because the volume of the area of the thermal desorption cavity 5 corresponding to the heating assembly 8 is larger than the volume of the area of the two sides of the heating assembly 8, so that the soil is more compact in the area of the two sides of the heating assembly 8 than the area of the heating assembly 8, thereby under the effects of the barrel, the conveying shaft and the soil, the toxic gas can be well isolated in the thermal desorption cavity 5 in the area of the heating assembly 8, further, the extraction effect of the gas treatment assembly 1 is improved, the residual and leakage of the toxic gas is reduced, and because the area of the thermal desorption cavity 5 corresponding to the heating assembly 8 is larger, the soil is changed into a loose state under the extrusion condition after the soil enters the area, the soil, the surface area of the soil is increased, and the heating assembly is fully heated and the soil is more uniform, thereby, the soil is heated and the soil is fully increased, the soil is heated and the soil is desorbed efficiency is increased.
In the case of a particular application, the transmission assembly 2 may be a rotary electric machine. Further, the gas treatment assembly 1 is a cyclone dust removal device.
In a specific application, in order to realize that the volume of the region of the thermal desorption cavity 5 corresponding to the heating assembly 8 is larger than the volume of the regions at two sides of the heating assembly 8, the thermal desorption cavity can be realized by one of the following modes:
the first method is as follows: set the 3 inner walls of barrel into reducing structure to satisfy at least: the distance between the inner walls of the cylinder 3 in the area where the heating assembly 8 is located is larger than the distance between the inner walls of the areas at two sides of the heating assembly 8, and then the volume of the area, corresponding to the heating assembly 8, of the thermal desorption cavity 5 is larger than the volume of the areas at two sides of the heating assembly 8.
The second method comprises the following steps: the conveying shaft 4 is set to be of a reducing structure and at least satisfies the following conditions: the shaft diameter of the conveying shaft 4 in the area where the heating assembly 8 is located is smaller than the shaft diameter of the conveying shaft 4 in the areas on two sides of the heating assembly 8, and further the volume of the heat desorption cavity 5 corresponding to the area where the heating assembly 8 is located is larger than the volume of the areas on two sides of the heating assembly 8.
In the two modes, the first mode is inconvenient to process due to the diameter-variable structure of the barrel 3, soil is extremely easy to extrude and accumulate in the barrel 3 to influence soil conveying, and meanwhile, the design of a conveying shaft and the maintenance and cleaning in the barrel 3 are not convenient.
Therefore, the invention provides a further specific mode on the basis of the mode two, and specifically comprises the following steps:
as shown in fig. 6, the conveying shaft 4 is of a reducing structure; the conveying shaft 4 sequentially forms a first shaft section a, a second shaft section B and a third shaft section C, the second shaft section B is located in the region where the heating assembly 8 is located, and the shaft diameter of the second shaft section B is smaller than the shaft diameters of the first shaft section a and the third shaft section C. In the present embodiment, the conveying shaft 4 is designed by the small shaft diameter of the second shaft section B, so that the volume of the thermal desorption cavity 5 in the area where the heating assembly 8 is located is larger than the volume of the thermal desorption cavity 5 in the area where the first shaft section a and the third shaft section C are located, that is, the space of the thermal desorption cavity 5 in the area where the heating assembly 8 is located is larger, and the space of the thermal desorption cavity 5 in the area where the first shaft section a and the third shaft section C are located is smaller, so that when soil enters or exits the thermal desorption cavity 5 of the second shaft section B through the first shaft section a or the third shaft section C, the soil can be compacted by being pressed through the first shaft section a or the third shaft section C first, after entering the thermal desorption cavity 5 of the second shaft section B, the soil can be loosened again due to the increased space, the heated volume of the soil is increased, when the soil is conveyed to the remaining third shaft section C or the first shaft section a after heating is completed, the soil can be compacted again due to the reduced space, and further, the soil can be conveyed continuously, and the soil can be further in the thermal desorption cavity 5 in the area where the first shaft section a third shaft section a region a and a third shaft section C is located, and a gas extraction cavity is formed, so that toxic gas can be separated, and the soil can be treated, and the soil can be completely separated, and the toxic gas can be removed, and the toxic gas can be treated.
When in specific application, carry axle 4 still including being located the regional fourth shaft body section D of 6 soil inlets, first shaft body section A, second shaft body section B, third shaft body section C and fourth shaft body section D form in order, fourth shaft body section D one end stretch out to thermal desorption chamber 5 outside with transmission assembly 2 transmission is connected, just fourth shaft body section D's the diameter of axle is less than third shaft body section C's diameter of axle.
When adopting reducing shaft design to carry out thermal desorption, form fine gaseous isolated effect, the shaft body section that is located 6 one sides of soil import just needs to extrude more soil and makes it compress tightly closely, can form fine isolated effect, and sufficient soil volume has when guaranteeing follow-up soil reextrusion, based on this, this embodiment is through setting up the fourth shaft body section D that an axle diameter is less than third shaft body section C's axle diameter in soil import 6 one end, the regional thermal desorption chamber 5 volume in fourth shaft body section D place will be greater than the regional thermal desorption chamber 5 volume in third shaft body section C place, soil can be more after soil import 6 gets into in piling up in the regional thermal desorption chamber 5 in fourth shaft body section D place, thereby third shaft body section C can satisfy sufficient soil demand and volume change when extruding soil, make third shaft body section C, the effect that the closely knit soil of realization extrusion that first shaft body section A can be better. Specifically, the soil outlet 7 is arranged in the area of the first shaft section a, so that the soil can be discharged from the soil outlet 7 in time after thermal desorption and compaction.
On this basis, the first shaft body segment a and the third shaft body segment C have the same shaft diameter, and the second shaft body segment B and the fourth shaft body segment D have the same shaft diameter. Through the arrangement, the shaft diameters of the first shaft body section A and the third shaft body section C are the same, namely the volumes of the thermal desorption cavities 5 in the areas of the first shaft body section A and the third shaft body section C are the same, so that the required amount of soil is the same when the soil is compacted, and the soil inflow and outflow amount in unit time is basically consistent; the shaft diameters of the second shaft body section B and the fourth shaft body section D are the same, namely the volumes of the thermal desorption cavities 5 in the areas where the second shaft body section B and the fourth shaft body section D are the same, so that the volume of the soil entering the thermal desorption cavities is basically the same as the volume of the loose soil in the second shaft body section B, the soil can be guaranteed to be in a maximum loose state as far as possible, and the uniform thermal desorption effect of the soil is improved.
Furthermore, the first shaft body segment a, the second shaft body segment B, the third shaft body segment C and the fourth shaft body segment D are in smooth transition, and the slope of the transition surface between the third shaft body segment C and the fourth shaft body segment D is smaller than the slope of the transition surface between the second shaft body segment B and the third shaft body segment C. When carrying axle 4 whole to adopt integrated into one piece structure shaping, in order to avoid abrupt axle diameter change and form the section between the axle body section, lead to soil to pile up at the section, or increase the soil extrusion force that carries axle 4 and receive and warp the damage, this embodiment carries and all adopts smooth transition surface to pass through between 4 axle body sections of axle, and then not only can reduce soil to the pressure of carrying axle 4, simultaneously also can be better carry soil, and the transition surface inclination between third axle body section C and the fourth axle body section D is less than the transition surface inclination of second axle body section B and third axle body section C, make the transition surface inclination between third axle body section C and the fourth axle body section D littleer, length is longer, and then soil can be slowly extrudeed under loose state, avoid the extrusion of soil to make and carry axle 4 to bear great effort, and the transition surface inclination of second axle body section B and third axle body section C is bigger, then explain the transition surface inclination of second axle body section B and third axle body section C is bigger, length is shorter, can come fast loose like this, the soil that is also broken up more easily, and then ensure the desorption of soil heat.
In specific applications, and with continued reference to fig. 6, the first, second and third shaft sections a, B, C are each provided with a temperature sensor 9 on the surface. The temperature sensor 9 can detect the temperature of the thermal desorption cavity 5 or the soil in the corresponding areas of the first shaft body segment A, the second shaft body segment B and the third shaft body segment C in real time, so that the thermal treatment temperature required by polluted soil with different properties can be adjusted or detected based on temperature detection, the accuracy of the temperature required by thermal desorption is further improved, and the thermal desorption efficiency and effect are improved.
In above structure, carry axle 4 and provide soil support and isolation effect while, still need carry soil, for the isolation effect of simplifying the structure and strengthening soil, the transport axle 4 of this embodiment is the auger delivery axle, the screw of transport axle 4 and 3 inner wall clearance fits of barrel, can be fine transport soil through this mode to at first axle body section A, third axle body section C, transport axle 4 and its screw can be better with soil extrusion and form continuous soil seal, further can increase the gas isolation effect of the regional heat desorption chamber 5 in first axle body section A, third axle body section C.
Continuing to refer to fig. 6, since the conveying shaft 4 is a spiral conveying shaft, and since the thermal desorption cavity 5 in the area of the second shaft section B has a large volume, soil is very easy to remain in the thermal desorption cavity 5 in the area of the second shaft section B and cannot be sent out in time when conveying soil, so that the soil is accumulated to affect the thermal desorption effect and increase the pressure of the thermal desorption cavity 5 in the area of the second shaft section B, and the surface of the conveying shaft 4 in the embodiment, which is located on the second shaft section B, is further provided with first stirring rake teeth 10. The first rabble blade 10 is fixed to the second shaft section B to rotate therewith, so that the soil can be stirred and carried up during the rotation, and the soil can be better carried into the screw of the conveying shaft 4 to be carried away. Specifically, the first rabble blade 10 is composed of a radial body fixed to the second shaft section B and a plurality of axial bodies disposed on the radial body. Furthermore, the radial body and the axial body are both rod bodies or plate bodies.
With continued reference to fig. 5, the cartridge 3 includes an outer housing 11 and an inner housing 12, the inner housing 12 is disposed inside the outer housing 11, and the inside of the inner housing 12 forms the thermal desorption chamber 5; the outer casing 11 and the inner casing 12 are spaced apart from each other to form a closed heating cavity 13, the heating assembly 8 is disposed in the heating cavity 13, and the second shaft segment B is located inside the heating cavity 13.
In order to avoid the direct soil secondary pollution that causes with the soil contact of heating element 8, and better protection heating element 8, this embodiment forms heating chamber 13 through the shell body 11 and the interior casing 12 that the interval set up, isolates through setting up heating element 8 in heating chamber 13 to heating element 8 can realize the heating through heating interior casing 12.
With continued reference to fig. 5, in a specific application, a closed preheating chamber 14 and a closed cooling chamber 15 are further formed between the outer shell 11 and the inner shell 12; the preheating cavity 14, the heating cavity 13 and the cooling cavity 15 are sequentially arranged and are mutually independent; the preheating cavity 14 and the cooling cavity 15 are both internally provided with heat exchange assemblies 16, the soil inlet 6 is arranged on the cylinder 3 in the area where the preheating cavity 14 is located, and the soil outlet 7 is arranged on the cylinder 3 in the area where the cooling cavity 15 is located; the first shaft section a is located in the thermal desorption chamber 5 in the area corresponding to the cooling chamber 15, and the third shaft section C is located in the thermal desorption chamber 5 in the area corresponding to the preheating chamber 14.
On the basis, the heat exchange assemblies 16 in the preheating cavity 14 and the cooling cavity 15 are communicated through a pipeline to form a heat exchange circulation system. Through heat transfer circulation system, the heat exchange assembly 16 in the cooling chamber can be carried to heat exchange assembly 16 in preheating chamber 14 in order to be used for soil preheating, and then can effectively utilize absorbent heat, reduces the heat loss, and then reduces the energy consumption and the cost of system.
As a specific form of the heat exchange circulation system, the heat exchange assemblies 16 in the preheating chamber 14 and the cooling chamber 15 are both heat exchangers, an outlet end of the heat exchanger in the preheating chamber 14 is communicated with an inlet end of the heat exchanger in the cooling chamber 15 through a pipeline E, and an inlet end of the heat exchanger in the preheating chamber 14 is communicated with an outlet end of the heat exchanger in the cooling chamber 15 through a pipeline F. Furthermore, the heat absorbed by the heat exchanger in the cooling chamber 15 can be transferred to the heat exchanger in the preheating chamber 14 through the medium in the heat exchanger via the pipeline F, and the medium in the heat exchanger after the heat exchanger in the preheating chamber 14 exchanges manpower enters the heat exchanger in the cooling chamber 15 via the pipeline E to absorb heat again, so that the effective utilization of heat is realized. Specifically, the heat exchange assemblies 16 in the preheating chamber 14 and the cooling chamber 15 are heat pipe heat exchangers, and the medium in the heat pipe heat exchangers can be water or oil.
When in specific application, the outer wall of the barrel 3 is provided with a heat insulation layer, the inner side wall of the barrel 3 corresponding to the heat desorption cavity 5 and the outer wall of the conveying shaft 4 are both provided with wear-resistant layers, and the conveying shaft 4 is positioned on the outer layer of the wear-resistant layer and is also provided with a heat insulation wear-resistant coating. Thermal-insulated heat preservation can effectively completely cut off barrel 3 and external heat transfer, reduce the inside calorific loss of barrel 3, and because soil is carried axle 4 in hot desorption chamber 5, 3 inside walls of barrel that hot desorption chamber 5 corresponds and carry 4 outer walls of axle can with soil contact, extrusion and friction, thereby very easily damage, therefore, this embodiment strengthens the wearability of 3 inside walls of barrel and transport axle 4 through the wearing layer that sets up the correspondence, in order to increase the two life-span, and simultaneously, in order to reduce calorific loss, avoid the heat to pass through and carry axle 4 and external contact and heat transfer, this embodiment is carrying axle 4 and still is provided with thermal-insulated wear-resistant coating on the wearing layer skin that is located, thereby utilize thermal-insulated wear-resistant coating to play thermal-insulated effect. Further, the wear-resistant layer is a ceramic wear-resistant layer.
Continuing to refer to fig. 5, the thermal desorption chamber 5 is closed at both ends of the cylinder 3 through the fixed cylinder cover 17 and the movable cylinder cover, respectively; one end of the conveying shaft 4 penetrates through the fixed cylinder cover 17 and extends out of the thermal desorption cavity 5 to be in transmission connection with the transmission assembly 2, and the other end of the conveying shaft 4 penetrates through the movable cylinder cover and is positioned; the movable barrel cover can move under the action of soil in the thermal desorption cavity 5 so as to conduct or isolate the thermal desorption cavity 5 and the soil outlet 7.
In this embodiment, consider further isolated problem of gas and soil discharge problem, designed fixed cover 17 and activity cover, fixed cover 17 is fixed in barrel 3 one end, and activity cover then swing joint in the barrel 3 other end, and the activity cover can move under the effort of the interior soil of heat desorption chamber 5, and then switches on or isolated heat desorption chamber 5 and soil outlet 7 with the removal in-process, realizes soil automatic discharge.
Specifically, the movable cylinder cover comprises a cover body 18 and an elastic element 19, one end of the elastic element 19 is connected with the cylinder body 3, the other end of the elastic element 19 is connected with the cover body 18, and the cover body 18 can be tightly pressed and sealed at the end part of the cylinder body 3 based on the elastic force of the elastic element 19 so as to isolate the heat desorption cavity 5 from the soil outlet 7, or can move under the action of the soil pressure in the heat desorption cavity 5 so as to conduct the heat desorption cavity 5 with the soil outlet 7. Under the effect of elastic element 19, lid 18 can be through its elastic force compact sealed barrel 3, hot desorption chamber 5 and soil outlet 7 are isolated this moment, soil is in hot desorption chamber 5 normal transport and heat treatment, when soil extrusion and begin to extrude lid 18, elastic force can be overcome to soil and the lid 18 begins to promote, when soil constantly carries the extrusion, soil makes 3 internal pressure increases of barrel, soil thrust is greater than elastic element 19's elastic force, can open lid 18, and then realize that hot desorption chamber 5 and soil outlet 7 switch on, can guarantee through this mode that the internal energy of barrel 3 realizes gaseous closed in automatic row material.
For the effect of movable cover more than the better realization, the 3 one end openings of barrel of this embodiment form soil outlet 7, lid 18 can seal at the opening part, and then can not only be better the interior heat desorption chamber 5 of closed barrel 3, soil direction of delivery can utilize its thrust to promote lid 18 simultaneously, further has made things convenient for soil to discharge.
In some embodiments, when the barrel 3 is composed of the outer housing 11 and the inner housing 12, the cover 18 is used to seal the inner housing 12, and the elastic element 19 may be disposed on the outer housing 11, and the length of the outer housing 11 may be slightly longer than the inner housing 12 to facilitate installation of the elastic element 19 and to provide a space and distance for movement of the cover 18. Specifically, an opening is formed at one end of the inner shell 12 to form the soil outlet 7, the cover 18 is sealed at the opening, the outer shell 11 on the same side with the opening continues to extend to form an installation area, the elastic element 19 is located in the installation area, one end of the elastic element is installed on the outer shell 11, and the other end of the elastic element is installed on the cover 18, so that the purpose of the invention can be well achieved. Further, the elastic elements 19 may be uniformly distributed in plurality to meet the pressing requirement of the cover 18 and ensure uniform pressing. Further, the elastic element 19 may be a compression spring.
Based on above structure, the end that carries axle 4 to run through movable cover is still recessed to be formed with hole 20, is connected with back shaft 22 through bearing 21 in the hole 20, and back shaft 22 stretches out hole 20 and rotates and support on support 23, support 23 is located the movable cover outside. This embodiment can be fine through back shaft 22, support 23 will carry axle 4 to support, ensures the normal removal of activity cover, can not influence the rotation of carrying axle 4 when guaranteeing simultaneously that the activity cover removes, and adopts the hole 20 of carrying 4 tip indent formation to set up, can avoid influencing the sealed of activity cover to also can not lead to the fact the influence to the activity cover.
On the basis, the fixed cylinder cover 17 and the movable cylinder cover are provided with sealing rings at the penetrating positions of the conveying shafts 4. The sealing washer can carry out fine sealing with carrying axle 4 department of running through to prevent that the poisonous gas from leaking, and can ensure internal pressure so that soil extrusion is more closely knit.
On the basis, the side wall of the fixed cylinder cover 17 on one side of the thermal desorption cavity 5 is also provided with a pressure sensor. The pressure sensor is used for detecting the pressure of the corresponding thermal desorption cavity 5 in the preheating cavity so as to adjust the conveying speed of the conveying shaft 4 and the soil input amount of the soil inlet according to the pressure.
With reference to fig. 5, in a specific application, in order to increase the desorption rate and reduce the toxic gas residue, the cylinder 3 of the present embodiment is provided with an air suction port 25 and a gas return port 26 which are communicated with the thermal desorption chamber 5; the air suction opening 25 is arranged above the barrel 3 in the area where the heating assembly 8 is located, namely the area corresponding to the heating cavity 13 in some embodiments, and is close to one side of the soil outlet 7; the gas return opening 26 is arranged below the cylinder 3 in the area where the heating assembly 8 is located, namely the area corresponding to the heating cavity 13 in some embodiments, and is close to one side of the soil inlet 6; the pumping port 25 is communicated with the gas inlet end of the gas processing assembly 1 through a pipeline G, and the gas return port 26 is communicated with the gas outlet end of the gas processing assembly 1 through a pipeline H.
When thermal desorption is carried out, in the area where the heating assembly 8 is located, namely the thermal desorption cavity 5 of the area corresponding to the heating cavity 13 in some embodiments, soil is heated by the heating assembly 8 to generate toxic gas during thermal desorption, the toxic gas can be rapidly pumped out to the gas treatment assembly 1 through the pumping hole 25 and the pipeline G, meanwhile, after the toxic gas is continuously pumped out, the thermal desorption cavity 5 of the area where the heating assembly 8 is located forms a negative pressure environment, at the moment, the gas treatment assembly 1 can convey anaerobic clean air into the area through the pipeline H and the gas return hole 26, the desorption section soil gas flow rate is accelerated, and the gas return hole 26 is formed below the cylinder 3 of the area where the heating assembly 8 is located, so that the anaerobic clean air can be better contacted with the soil, the discharge of the polluted gas in the soil is accelerated, and the residue of the polluted gas is reduced.
In specific application, the air pumping port 25 and the gas return port 26 are both provided with filter screens for filtering soil dust in the gas.
In a specific application, a first one-way valve 27 is arranged at the gas outlet end of the gas processing assembly 1, a pipeline G where the gas return port 26 is located is communicated between the first one-way valve 27 and the gas processing assembly 1, and a second one-way valve 28 is arranged on a pipeline G where the gas return port 26 is communicated with the gas processing assembly 1; the cracking pressure of the second check valve 28 is greater than the cracking pressure of the first check valve 27.
Under the normal condition, toxic gas can discharge through first check valve 27 after handling through gas treatment component 1, when heating element 8 is in regional gas pressure and is less than second check valve 28, second check valve 28 opens, first check valve 27 closes, carry the clean gas of oxygen-free after handling gas treatment component 1 to gas reflux mouth 26, contaminated gas's discharge in the soil is accelerated, when a large amount of toxic gas that volatilizees in the soil make heating element 8 be in regional gas pressure rise, second check valve 28 closes, first check valve 27 opens the clean gas of oxygen-free that normal discharge treatment had, thereby in the time of improving the thermal desorption effect, guarantee that toxic gas is taken out completely, and can realize the automatic air make-up in heating element 8 place region.
In specific application, the heating component is an electromagnetic induction coil or a gas combustion nozzle. The electromagnetic induction coil can realize rapid heating and accurate temperature control, the heating speed and the energy utilization efficiency are improved, meanwhile, the electromagnetic induction coil and soil are indirectly heated and cannot be directly contacted with the soil, and the generation of secondary pollutants such as dioxin and the like can be effectively avoided; and adopt the gas combustion nozzle then can spray the gas through the nozzle, utilize gas release heat to heat, can not contact with soil equally, when specific application, the external gas combustion ware of gas combustion nozzle provides the gas, but heating chamber joinable pressure pipeline retrieves the gas.
With continued reference to fig. 5, the soil inlet 6 is also connected to a feeding mechanism in this embodiment, based on structural integrity; the feeding mechanism comprises a feeding hopper 29 communicated with the soil inlet 6, a spiral conveying mechanism 30 is arranged in the feeding hopper 29, and a second stirring rake tooth 31 and a material height sensor 32 are further arranged on the spiral conveying mechanism 30. The soil of this embodiment can enter the soil inlet 6 from the feeding hopper 29 through the screw conveying mechanism 30, and is scattered and conveyed under the action of the screw conveying mechanism 30 and the second stirring rake teeth 31, and meanwhile, the material height inside the feeding hopper 29 can be detected by the material height sensor 32 so as to supplement the soil at any time. Specifically, the feed hopper 29 is integrally of a sealing structure, and the upper end of the feed hopper can be provided with a feed inlet with a sealing cover for feeding.
Further, this embodiment continuous type soil thermal desorption system still includes base 33, barrel subassembly and drive assembly 2 all set up on base 33. The base 33 can well support the barrel assembly, the transmission assembly 2 and the like, and the whole system is arranged and supported by the base, so that the system is convenient to hoist and carry.
Further, the continuous thermal desorption system for soil of the present embodiment further includes a control device 34, wherein the control device 34 is electrically connected to the transmission assembly 2, the gas treatment assembly 1 and the heating assembly 8. Specifically, the control device 34 may be a PLC controller, a PAC controller, or the like.
The above is a description of the overall structure of the continuous thermal soil desorption system, and for better understanding and implementation of the system, the present invention will be further described in detail with reference to specific examples.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
As shown in fig. 1-6, the continuous soil thermal desorption system comprises a cylinder assembly, a gas treatment assembly 1 and a transmission assembly 2; the cylinder component comprises a cylinder 3 and a conveying shaft 4; the gas treatment assembly comprises a cylinder body 3, a gas treatment assembly 1, a gas inlet, a soil outlet and an electromagnetic induction coil, wherein the cylinder body 3 is hollow to form a closed thermal desorption cavity 5, the cylinder body 3 is provided with the soil inlet 6 and the soil outlet 7 which are communicated with the thermal desorption cavity 5, the cylinder body 3 between the soil inlet 6 and the soil outlet 7 is provided with the electromagnetic induction coil which is used for heating soil in the thermal desorption cavity 5, and the gas treatment assembly 1 is communicated with the thermal desorption cavity 5 in the area where the electromagnetic induction coil is located; the conveying shaft 4 is arranged in the thermal desorption cavity 5, the conveying shaft 4 is of a reducing structure, the conveying shaft 4 sequentially forms a first shaft body section A, a second shaft body section B, a third shaft body section C and a fourth shaft body section D, the second shaft body section B is located in the area where the electromagnetic induction coil is located, the shaft diameter of the second shaft body section B is smaller than that of the first shaft body section A and that of the third shaft body section C, one end of the fourth shaft body section D extends out of the thermal desorption cavity 5 to be in transmission connection with the transmission assembly 2, the shaft diameter of the fourth shaft body section D is smaller than that of the third shaft body section C, the shaft diameters of the first shaft body section A and that of the third shaft body section C are the same, the shaft diameters of the second shaft body section B and that of the fourth shaft body section D are the same, the first shaft body section A, the second shaft body section B, the third shaft body section C and the fourth shaft body section D are in smooth transition, the transition surface of the third shaft body section C and that of the third shaft section C is smaller than that of the second shaft section B and that of the third shaft section C, and the surface of the first shaft section A, the second shaft section B and the third shaft section C are provided with temperature sensors 9; the conveying shaft 4 is a spiral conveying shaft, and a spiral of the conveying shaft 4 is in clearance fit with the inner wall of the cylinder 3; the conveying shaft 4 is also provided with a first stirring rake tooth 10 on the surface of the second shaft section B; the cylinder 3 comprises an outer shell 11 and an inner shell 12, the inner shell 12 is arranged inside the outer shell 11, and the heat desorption cavity 5 is formed inside the inner shell 12; the outer shell 11 and the inner shell 12 are arranged at intervals to form a closed preheating cavity 14, a heating cavity 13 and a cooling cavity 15, the preheating cavity 14, the heating cavity 13 and the cooling cavity 15 are sequentially arranged and are mutually independent, the electromagnetic induction coil is arranged in the heating cavity 13, the second shaft section B is positioned at the inner side of the heating cavity 13, heat exchangers are arranged in the preheating cavity 14 and the cooling cavity 15, the soil inlet 6 is arranged on the barrel 3 in the area where the preheating cavity 14 is located, and the soil outlet 7 is arranged on the barrel 3 in the area where the cooling cavity 15 is located; the first shaft section A is located in the thermal desorption chamber 5 in the area corresponding to the cooling chamber 15, and the third shaft section C is located in the thermal desorption chamber 5 in the area corresponding to the preheating chamber 14; the outlet end of the heat exchanger in the preheating cavity 14 is communicated with the inlet end pipeline of the heat exchanger in the cooling cavity 15, and the inlet end of the heat exchanger in the preheating cavity 14 is communicated with the outlet end pipeline of the heat exchanger in the cooling cavity 15; the two ends of the cylinder 3 respectively seal the heat desorption cavity 5 through a fixed cylinder cover 17 and a movable cylinder cover; one end of the conveying shaft 4, namely a fourth shaft body section D penetrates through the fixed cylinder cover 17 and extends out of the thermal desorption cavity 5 to be in transmission connection with the transmission assembly 2; the other end of the conveying shaft 4, namely the first shaft section A, penetrates through the movable cylinder cover and is positioned; the movable cylinder cover can move under the action of soil in the thermal desorption cavity 5 so as to conduct or isolate the thermal desorption cavity 5 and the soil outlet 7; the conveying shaft 4 penetrates through the end part of the movable cylinder cover and is also inwards recessed to form an inner hole 20, a supporting shaft 22 is connected in the inner hole 20 through a bearing 21, the supporting shaft 22 extends out of the inner hole 20 and is rotatably supported on a support 23, and the support 23 is positioned on the outer side of the movable cylinder cover; the movable cylinder cover comprises a cover body 18 and a compression spring, one end of the compression spring is connected with the cylinder body 3, the other end of the compression spring is connected with the cover body 18, the cover body 18 can be tightly pressed and sealed at the end part of the cylinder body 3 based on the elastic force of the compression spring so as to isolate the thermal desorption cavity 5 from the soil outlet 7, or can move under the action of the soil pressure in the thermal desorption cavity 5 so as to conduct the thermal desorption cavity 5 with the soil outlet 7; the fixed cylinder cover 17 and the movable cylinder cover are provided with sealing rings at the penetration part of the conveying shaft 4; the side wall of the fixed cylinder cover 17 positioned at one side of the thermal desorption cavity 5 is also provided with a pressure sensor; the cylinder 3 is provided with an air suction port 25 and a gas return port 26 which are communicated with the thermal desorption cavity 5; the air pumping port 25 is arranged above the cylinder 3 in the area where the electromagnetic induction coil is located and is close to one side of the soil outlet 7; the gas return port 26 is arranged below the cylinder body in the area where the electromagnetic induction coil is located and close to one side of the soil inlet 6; the pumping port 25 is communicated with the gas inlet end of the gas processing assembly 1 through a pipeline, and the gas return port 26 is communicated with the gas outlet end of the gas processing assembly 1 through a pipeline; a first check valve 27 is arranged at the gas outlet end of the gas processing assembly 1, a pipeline of the gas return port 26 is communicated between the first check valve 27 and the gas processing assembly 1, a second check valve 28 is arranged on a pipeline of the gas return port 26 communicated with the gas processing assembly 1, and the opening pressure of the second check valve 28 is greater than that of the first check valve 27; the outer wall of the cylinder 3 is provided with a heat insulation layer, the inner side wall of the cylinder corresponding to the heat desorption cavity and the outer wall of the conveying shaft are both provided with ceramic wear-resistant layers, and the conveying shaft is also provided with a heat insulation wear-resistant coating on the outer layer of the ceramic wear-resistant layers; the soil inlet is also connected with a feeding mechanism; the feeding mechanism comprises a feeding hopper 29 communicated with a soil inlet, a spiral conveying mechanism 30 is arranged in the feeding hopper 29, and a second stirring rake tooth 31 and a material height sensor 32 are further arranged on the spiral conveying mechanism 30; the continuous soil thermal desorption system further comprises a base 33 and a control device 34, and the cylinder assembly and the transmission assembly 2 are arranged on the base 33; the transmission assembly 2, the gas processing assembly 1, the temperature sensor 9, the material height sensor 32, the electromagnetic induction coil and the pressure sensor are all electrically connected with the control device 34.
In this embodiment, contaminated soil enters from the feed hopper, is stirred and extruded to make soil density become closely knit, then enters into the barrel 3, and whole barrel 3 corresponds one-to-one with preheating chamber 14, heating chamber 13 and cooling chamber 15, is divided into preheating section L1, desorption section L2, cooling section L3. The diameter of a screw of a conveying shaft 4 arranged at the center of a cylinder 3 is of a reducing design, wherein the shaft diameter of a preheating section L1 is gradually increased from outside to inside, so that the space between the conveying shaft 4 and the cylinder wall of an inner shell 12 is continuously reduced and then kept unchanged, soil in the section is further compressed to play a sealing role, when the soil enters a desorption section L2, the shaft diameter is suddenly reduced, the space between the conveying shaft 4 and the cylinder wall of the inner shell 12 is increased, so that the soil is dispersed, the heating area of the soil is increased, and the volatilization of pollutants is facilitated, a suction opening 25 arranged at the upper part of the tail end of the desorption section L2 continuously pumps out gas in the desorption section L2 to form a negative pressure environment, when the negative pressure is lower than a set value, a second one-way valve 28 arranged at the lower part of the front end of the desorption section L2 is opened to supplement anaerobic clean air to the desorption section L2, the residual pollutant gas is reduced by pumping out accelerating, after the soil enters a cooling section L3, the shaft diameter is gradually increased again, the soil is squeezed to prevent toxic gas from overflowing from a soil outlet from the soil outlet by compaction after the soil is accelerated, a first conveying rake tooth is arranged on the conveying shaft 4, a rotary stirring cylinder cover is further arranged to improve the soil extrusion performance, and the soil can be continuously treated, and the soil can be further treated by a soil extrusion process, and a soil extrusion cover can be further, and the soil can be further treated by a soil after the soil is further improved.
In the process, the heat exchangers of the preheating cavity 14 and the cooling cavity 15 can preheat the heated soil after heat exchange, the temperature of the soil to be treated is increased, the energy consumption of a desorption section is reduced, the soil is heated by the electromagnetic induction coil without contact, secondary pollutants can be effectively prevented from being generated by direct contact of the heating assembly and the soil, no tail gas is generated by electromagnetic induction heating, accurate temperature control can be realized, in addition, high-temperature tail gas is avoided, the energy utilization efficiency is higher, toxic gas generated in the thermal desorption cavity 5 can be rapidly discharged and treated through the air exhaust port 25, the treated clean air is discharged into the atmosphere through a pipeline or is filled into the desorption soil through the gas return port 26, the soil gas flow rate in the thermal desorption cavity 5 is accelerated, the residual gas is reduced, the desorption rate is increased, meanwhile, the first one-way valve 27 and the second one-way valve 28 are respectively arranged at the gas outlet and the gas return port 26 of the gas treatment assembly 1, when the gas pressure in the anaerobic gas treatment assembly 13 is lower than a set value, the second one-way valve 28 is opened, the pollution gas in the anaerobic gas is rapidly discharged, and when the toxic gas in the anaerobic gas in the thermal desorption cavity 13 is completely volatilized, the toxic gas is completely ensured to be completely volatilized, and the second one-way valve 28 is completely closed.
Fig. 7 is a graph showing the change of soil compactness of soil in different areas in the cylinder 3. In the figure, a first shaft section a, a second shaft section B, a third shaft section C and a fourth shaft section D correspond to a continuous region a, a continuous region B, a continuous region C and a continuous region D in the thermal desorption chamber 5, respectively.
In the embodiment, the automatic adjustment of the soil compactness is realized through the reducing structure of the conveying shaft 4, wherein the soil enters from the fourth shaft body section D, namely, the area D and is primarily stirred and conveyed and extruded through the conveying shaft 4, the compactness is improved in a natural state, the soil is gradually extruded and compacted from the area D through the conveying and extruding of the reducing conveying shaft 4, the soil becomes very compact when reaching the area c, gas hardly enters into the area c or the area D from the area b, the sealing is realized, when the soil is continuously conveyed to the area b, the shaft diameter of the conveying shaft 4 is suddenly reduced, the space of the area b is enlarged, the compacted soil is naturally dispersed, meanwhile, the first rake teeth further accelerate the soil dispersion, therefore, the soil in the area b becomes very loose under a high-temperature environment, organic pollutants adhered to the inside of the soil are rapidly heated and volatilized, the soil is discharged through the gas outlet 25, the desorbed soil enters into the area a, the shaft diameter of the conveying shaft 4 in the area a is again thickened, the space in the area a is reduced, the soil is squeezed again to achieve the sealing effect, meanwhile, the soil is further squeezed out of the gas from the movable cylinder cover, the reducing and the integral conveying system is designed based on the principle that the thermal toxicity is reduced and the soil is reduced.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (11)
1. The continuous soil thermal desorption system is characterized by comprising a cylinder assembly, a gas treatment assembly and a transmission assembly;
the cylinder component comprises a cylinder and a conveying shaft;
wherein, the first and the second end of the pipe are connected with each other,
the cylinder is internally hollow to form a closed thermal desorption cavity, the cylinder is provided with a soil inlet and a soil outlet which are communicated with the thermal desorption cavity, a heating assembly for heating the soil in the thermal desorption cavity is arranged on the cylinder between the soil inlet and the soil outlet, and the gas treatment assembly is communicated with the thermal desorption cavity in the area where the heating assembly is located;
the conveying shaft is arranged in the thermal desorption cavity, and one end of the conveying shaft extends out of the thermal desorption cavity and is in transmission connection with the transmission assembly;
the conveying shaft is of a reducing structure, and the thermal desorption cavity is of a reducing cavity structure which is larger than the areas on two sides of the heating assembly in volume corresponding to the area where the heating assembly is located based on the reducing structure of the conveying shaft;
the conveying shaft sequentially forms a first shaft body section, a second shaft body section and a third shaft body section, the second shaft body section is located in the area where the heating assembly is located, and the shaft diameter of the second shaft body section is smaller than that of the first shaft body section and that of the third shaft body section;
the conveying shaft further comprises a fourth shaft body section positioned in the soil inlet area, the first shaft body section, the second shaft body section, the third shaft body section and the fourth shaft body section are sequentially formed, one end of the fourth shaft body section extends out of the thermal desorption cavity to be in transmission connection with the transmission assembly, and the shaft diameter of the fourth shaft body section is smaller than that of the third shaft body section;
smooth transition is between first shaft body section, second shaft body section, third shaft body section and the fourth shaft body section, and the transition face inclination between third shaft body section and the fourth shaft body section is less than the transition face inclination of second shaft body section and third shaft body section.
2. The continuous thermal soil desorption system of claim 1 wherein the transport shaft is a spiral transport shaft, the spiral of the transport shaft having a clearance fit with the inner wall of the cylinder.
3. The continuous thermal soil desorption system of claim 1 or 2 wherein the cartridge comprises an outer housing and an inner housing, the inner housing being disposed inside the outer housing, the inner housing forming the thermal desorption chamber inside;
the heating assembly is arranged in the heating cavity, and the second shaft body section is positioned inside the heating cavity.
4. The continuous soil thermal desorption system according to claim 3, wherein a closed preheating chamber and a closed cooling chamber are respectively formed between the outer shell and the inner shell;
the preheating cavity, the heating cavity and the cooling cavity are sequentially arranged and are mutually independent;
the preheating cavity and the cooling cavity are both provided with heat exchange assemblies, the soil inlet is arranged on the cylinder body of the area where the preheating cavity is located, and the soil outlet is arranged on the cylinder body of the area where the cooling cavity is located;
the first shaft body section is located in a heat desorption cavity of an area corresponding to the cooling cavity, and the third shaft body section is located in a heat desorption cavity of an area corresponding to the preheating cavity.
5. The continuous soil thermal desorption system of claim 4, wherein the heat exchange assemblies in the preheating chamber and the cooling chamber are communicated through a pipeline to form a heat exchange circulation system.
6. The continuous soil thermal desorption system of claim 5, wherein the heat exchange assemblies in the preheating chamber and the cooling chamber are both heat exchangers, the outlet end of the heat exchanger in the preheating chamber is communicated with the inlet end pipeline of the heat exchanger in the cooling chamber, and the inlet end of the heat exchanger in the preheating chamber is communicated with the outlet end pipeline of the heat exchanger in the cooling chamber.
7. The continuous soil thermal desorption system of claim 1, wherein the thermal desorption cavity is closed at two ends of the cylinder body through a fixed cylinder cover and a movable cylinder cover respectively;
one end of the conveying shaft penetrates through the fixed cylinder cover and extends out of the thermal desorption cavity to be in transmission connection with the transmission assembly;
the other end of the conveying shaft penetrates through the movable cylinder cover and is positioned;
the movable cylinder cover moves under the action of soil in the thermal desorption cavity to conduct or isolate the thermal desorption cavity and the soil outlet.
8. The continuous soil thermal desorption system of claim 7, wherein the movable cylinder cover comprises a cover body and an elastic element, one end of the elastic element is connected with the cylinder body, the other end of the elastic element is connected with the cover body, the cover body is tightly pressed on the end part of the cylinder body based on the elastic force of the elastic element so as to isolate the thermal desorption cavity from the soil outlet, or the cover body moves under the action of the soil pressure in the thermal desorption cavity so as to conduct the thermal desorption cavity with the soil outlet.
9. The continuous soil thermal desorption system of claim 1 wherein the cartridge body is provided with a gas extraction port and a gas return port communicating with the thermal desorption chamber;
the air pumping port is arranged above the cylinder body in the area where the heating assembly is located and is close to one side of the soil outlet;
the gas return port is arranged below the cylinder body in the area where the heating assembly is located and is close to one side of the soil inlet;
the gas pumping port pipeline is communicated with a gas inlet end of the gas processing assembly, and the gas return port pipeline is communicated with a gas outlet end of the gas processing assembly.
10. The continuous soil thermal desorption system of claim 9 wherein a first one-way valve is arranged on the gas outlet end of the gas treatment assembly, the gas return port pipeline is communicated between the first one-way valve and the gas treatment assembly, and a second one-way valve is arranged on the pipeline of the gas return port communicated with the gas treatment assembly;
the cracking pressure of the second one-way valve is greater than the cracking pressure of the first one-way valve.
11. The continuous thermal soil desorption system of claim 1 wherein the heating assembly is an electromagnetic induction coil or a gas combustion nozzle.
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| KR102440347B1 (en) * | 2021-08-25 | 2022-09-06 | 주식회사 일진텍 | Polluted Soil Purification Apparatus |
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