CN111036664A - Hierarchical integrated form dystopy thermal desorption device of multilayer - Google Patents
Hierarchical integrated form dystopy thermal desorption device of multilayer Download PDFInfo
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- CN111036664A CN111036664A CN201911400885.3A CN201911400885A CN111036664A CN 111036664 A CN111036664 A CN 111036664A CN 201911400885 A CN201911400885 A CN 201911400885A CN 111036664 A CN111036664 A CN 111036664A
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- 238000003795 desorption Methods 0.000 title claims abstract description 67
- 239000002912 waste gas Substances 0.000 claims abstract description 37
- 238000007599 discharging Methods 0.000 claims abstract description 35
- 238000002485 combustion reaction Methods 0.000 claims abstract description 23
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000003546 flue gas Substances 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims description 82
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- 239000000463 material Substances 0.000 claims description 25
- 239000000779 smoke Substances 0.000 claims description 25
- 239000007789 gas Substances 0.000 claims description 24
- 238000011066 ex-situ storage Methods 0.000 claims description 15
- 239000007921 spray Substances 0.000 claims description 14
- 238000005507 spraying Methods 0.000 claims description 9
- 238000003860 storage Methods 0.000 claims description 8
- 239000003638 chemical reducing agent Substances 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 5
- 239000011810 insulating material Substances 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 239000011819 refractory material Substances 0.000 claims description 3
- 239000002351 wastewater Substances 0.000 claims description 3
- 238000004065 wastewater treatment Methods 0.000 claims description 3
- 238000000746 purification Methods 0.000 claims description 2
- 238000010791 quenching Methods 0.000 claims description 2
- 230000000171 quenching effect Effects 0.000 claims description 2
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- 230000009123 feedback regulation Effects 0.000 claims 1
- 238000004321 preservation Methods 0.000 claims 1
- 238000007669 thermal treatment Methods 0.000 abstract 5
- 239000002689 soil Substances 0.000 description 26
- 239000000446 fuel Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 11
- 239000003344 environmental pollutant Substances 0.000 description 7
- 231100000719 pollutant Toxicity 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 238000007689 inspection Methods 0.000 description 4
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- 230000003247 decreasing effect Effects 0.000 description 3
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- 238000009835 boiling Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 230000009193 crawling Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 235000015097 nutrients Nutrition 0.000 description 2
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- 229910000831 Steel Inorganic materials 0.000 description 1
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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
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention provides a multilayer graded integrated ectopic thermal desorption device, which comprises a feeding unit, a primary thermal treatment unit, a secondary thermal treatment unit, a chamber connecting channel, a discharging unit, a combustion unit, a desorbed waste gas discharging unit, an auxiliary device and the like, wherein spiral propelling furnace tubes are arranged in the middle of the primary thermal treatment unit and the secondary thermal treatment unit, a high-temperature flue gas channel is arranged outside the furnace tubes, and a combustion chamber is arranged at the lower part of the furnace tubes of the secondary thermal treatment unit.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and relates to a multilayer graded integrated ex-situ thermal desorption device.
Background
Thermal desorption is one of the main technologies for restoring the polluted soil, and the polluted soil is heated to a temperature above the boiling point of a target pollutant, so that the target organic pollutant is volatilized or separated from the soil, and finally enters a waste gas treatment system for complete removal or concentration and collection. In the thermal desorption process, target pollutants are subjected to evaporation, distillation, boiling, oxidation, pyrolysis and other effects, and different pollutants can be selectively removed by controlling the system temperature and the material residence time.
Thermal desorption techniques can be divided into two main categories, namely in-situ thermal desorption and ex-situ thermal desorption. The in-situ thermal desorption technology is mainly used for treating areas which are difficult to perform ex-situ remediation, such as deep soil and soil under buildings. Ectopic thermal desorption takes out the polluted soil and treats the polluted soil through a special thermal desorption device, has the advantages of wide pollutant treatment range, high treatment efficiency, movable equipment, reutilization of the repaired soil and the like, and is widely applied to treating the soil, sludge, sediment, filter residue and the like containing volatile and semi-volatile organic pollutants.
The thermal desorption method can be divided into direct heating and indirect heating according to whether the heat source carrier (high-temperature flue gas, steam, etc.) is in direct contact with the contaminated soil. The invention patents CN101712042A, CN207271801U, CN109720901A and the like adopt a direct heating mode for thermal desorption, heat source gas and desorbed pollution gas are mixed with each other, the tail gas treatment capacity is large, the treatment cost is higher, and the occupied area is large. Patent CN105750319B, CN105057337B etc. adopt indirect heating mode, and single thermal desorption main part device is horizontal auger propulsion structure of individual layer, and the inner space is small, and heat source gas and contaminated soil are shorter at the inside dwell time of thermal desorption device, unable abundant heat exchange, and heat utilization efficiency is low, and the pollutant is got rid of the effect and is difficult to ensure.
Disclosure of Invention
The invention aims to provide a multilayer graded integrated ectopic thermal desorption device, which is used for solving the problems of low heat utilization efficiency, poor pollutant removal effect, large occupied area and the like in the process of treating organic polluted soil by using the conventional thermal desorption equipment.
In order to achieve the purpose, the invention provides the following technical scheme:
a multilayer grading integrated ectopic thermal desorption device is characterized in that the thermal desorption device comprises a feeding unit, a primary heat treatment unit, a secondary heat treatment unit, a cavity connecting channel, a discharging unit, a combustion unit and a desorption waste gas discharge unit;
the upper part of the feeding unit is a material inlet, a vibrating screen is connected below the material inlet, and a rotary feeder is arranged below the vibrating screen;
the middle part of the primary heat treatment unit is provided with a primary spiral propelling furnace tube, the outside of the primary spiral propelling furnace tube is provided with a high-temperature flue gas channel, the primary spiral propelling furnace tube at the starting end of the primary heat treatment unit is provided with a feed inlet matched with the rotary feeder, the top of the high-temperature flue gas channel is provided with a smoke outlet, and the smoke outlet is connected with the bottom of a smoke exhaust pipeline; the top of the primary spiral propelling furnace tube at the tail end of the primary heat treatment unit is provided with an exhaust port, and the exhaust port is connected with the desorption waste gas discharge unit;
the second-stage heat treatment unit is positioned below the first-stage heat treatment unit and communicated with the first-stage heat treatment unit through a cavity connecting channel, and a second-stage spiral propelling furnace tube is arranged in the middle of the second-stage heat treatment unit; the outer part of the secondary spiral propelling furnace tube is provided with a high-temperature flue gas channel which is communicated with the high-temperature flue gas channel on the outer part of the primary spiral propelling furnace tube, and the lower part of the secondary spiral propelling furnace tube is provided with a combustion chamber;
the combustion unit is provided with a combustion nozzle, and the combustion nozzle faces towards the combustion chamber at the lower part of the secondary spiral propelling furnace tube;
the discharging unit is arranged at the tail end of the secondary heat treatment unit and comprises a rotary discharging machine, a humidifying spray nozzle matched with a discharging port of the rotary discharging machine, and a water storage tank connected with the humidifying spray nozzle.
Further, the thermal desorption device further comprises an auxiliary device which comprises a railing, a crawling ladder, a smoke exhaust pipeline and a base plate, wherein the smoke exhaust pipeline is provided with a gas sampling hole, and the outer wall of the lower portion of the smoke exhaust pipeline is provided with a heat insulation material.
Further, feeding unit, ejection of compact unit, desorption exhaust emission unit, auxiliary device all can be dismantled, one-level heat treatment unit and second grade heat treatment unit are the sled dress module, and the outer wall is equipped with the hoisting ring, and the transportation is convenient, and the scene is assembled simply.
Further, the primary heat treatment unit is stacked on the secondary heat treatment unit, a base plate is laid at the top of the outer wall of the primary heat treatment unit, a crawling ladder is laid on the side edge of the outer wall of the primary heat treatment unit to facilitate the passing of operation and maintenance personnel, and the number of the primary spiral propulsion furnace tubes and the number of the secondary spiral propulsion furnace tubes can be increased or decreased according to the requirement of processing capacity.
Furthermore, the aperture, the inclination angle and the vibration frequency of the screen mesh of the vibrating screen can be flexibly adjusted according to the soil property and the process requirement.
Furthermore, the rotary feeder can adjust the speed of the material entering the primary heat treatment unit by changing the rotating speed, and isolate the primary spiral propelling furnace tube from the outside air.
Furthermore, the inner walls of the primary heat treatment unit and the secondary heat treatment unit are both provided with refractory materials and heat-insulating materials.
Furthermore, the side walls of the first-stage heat treatment unit and the second-stage heat treatment unit are both provided with inspection manholes, and the inspection manhole cover plate is connected with the side walls in a flange sealing mode.
Furthermore, the primary spiral propelling furnace tube and the secondary spiral propelling furnace tube are both mainly composed of a left side wall, a right side wall, a longitudinal heat conducting furnace wall, a transmission spiral middle shaft and spiral blades; the outer parts of the right side walls of the primary spiral propelling furnace tube and the secondary spiral propelling furnace tube are respectively provided with an independent variable frequency motor and a speed reducer, and a dynamic sealing device is arranged at the joint of a transmission shaft of the speed reducer and the right side wall of the furnace tube.
Furthermore, the material propelling direction in the first-stage spiral propelling furnace tube is opposite to that in the second-stage spiral propelling furnace tube, the material in the first-stage spiral propelling furnace tube moves from left to right, and the material in the second-stage spiral propelling furnace tube moves from right to left.
Further, a first-stage feeding hole is formed in the upper portion of the left end of the first-stage spiral propelling furnace tube and is connected with the rotary feeder; the upper part of the right end of the primary spiral propelling furnace tube is provided with an exhaust port, and the exhaust port is connected with a waste gas discharge pipe; the lower part of the right end of the primary spiral propelling furnace tube is provided with a primary discharge hole, the upper part of the right end of the secondary spiral propelling furnace tube is provided with a secondary feed inlet, the primary discharge hole is communicated with the secondary feed inlet of the secondary spiral propelling furnace tube, and the secondary feed inlet is communicated with the primary discharge hole of the primary spiral propelling furnace tube; and a second-stage discharge hole is formed in the lower part of the left end of the second-stage spiral propelling furnace tube.
Further, the cavity interface channel is the annular sleeve form, comprises interior sleeve pipe and outer tube, interior sleeve pipe intercommunication one-level spiral propulsion boiler tube and second grade spiral propulsion boiler tube, and the intraductal material of one-level spiral propulsion boiler tube falls to get into the second grade spiral propulsion boiler tube through interior sleeve pipe, and desorption waste gas in the second grade spiral propulsion boiler tube gets into the one-level spiral propulsion boiler tube through interior sleeve pipe simultaneously, and then gets into desorption waste gas discharge unit. The outer sleeve is communicated with high-temperature flue gas channels of the primary heat treatment unit and the secondary heat treatment unit, and high-temperature flue gas in the secondary heat treatment unit enters the primary heat treatment unit through the space between the inner sleeve and the outer sleeve and then enters the smoke exhaust pipeline for high-altitude discharge.
Furthermore, the inner sleeve and the outer sleeve are connected by a corrugated pipe compensator and seal the interface, so that the phenomenon that the interface seal is damaged by the displacement generated by the expansion caused by heat and the contraction caused by cold of the pipe is prevented.
Furthermore, the rotary discharging machine is connected with a discharge hole at the lower part of the right end of the second-stage spiral propelling furnace tube, so that material discharge can be realized, the second-stage spiral propelling furnace tube is isolated from the outside air, and the humidifying spray nozzle is arranged below the rotary discharging machine and communicated with a water storage tank interface.
Furthermore, the liquid in the water storage tank is water or a mixed solution of water, soil microorganisms and nutrient solution, so that the water content of the soil after thermal desorption treatment can be increased, or the fertilizer efficiency of the soil is enhanced, and the using effect of the soil is improved.
Furthermore, the fuel burner is provided with a fuel inlet, an air inlet, a pressure regulating valve, an operating valve, a safety valve, an ignition valve, a flame detector, a combustion controller and other valve groups, and the number of the fuel burners can be determined according to the processing scale and the heat demand.
Still further, the fuel type may be gas or oil.
Further, the combustion unit still includes air draught fan, air draught fan import department is provided with adjustable air door and airstrainer.
Further, the waste gas discharge pipe is connected with an exhaust port at the upper part of the left end of the primary spiral propelling furnace tube, and waste gas generated in the thermal desorption process enters the water spraying device through the waste gas discharge pipe.
Furthermore, desorption waste gas discharge unit includes waste gas discharge pipe, water spray set, cold water nozzle and relief valve, water spray set can carry out rapid cooling, dust removal to waste gas, and the waste gas after spraying the processing gets into waste gas treatment facility and further purifies the back up to standard and discharges, and produced spraying waste water gets into waste water treatment facility, handles back cyclic utilization or up to standard and discharges, the side relief valve that establishes of waste gas discharge pipe, waste gas passes through the relief valve pressure release when the system superpressure.
Furthermore, the positions of the first-stage heat treatment unit, the second-stage heat treatment unit, the first-stage feeding hole, the first-stage discharging hole, the second-stage feeding hole, the second-stage discharging hole, the waste gas exhaust hole, the smoke exhaust pipeline and the like are all provided with temperature sensors for feedback adjustment of the temperature in the thermal desorption device.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the thermal desorption system is arranged in a grading way, high-temperature flue gas sequentially passes through the secondary heat treatment unit and the primary heat treatment unit, in the primary heat treatment unit, soil is heated and preheated, water is evaporated, and part of low-boiling-point organic pollutants volatilize from the soil and enter waste gas; in the second-stage thermal desorption treatment unit, organic pollutants in the soil are further desorbed and removed, the pollutant removal rate is high, and the heat in the flue gas is fully utilized in multiple stages.
(2) The thermal desorption system is arranged in a layered mode, the primary heat treatment unit is vertically stacked on the secondary heat treatment unit, the space is saved, the occupied area is small, and the requirement on site conditions is low.
(3) The thermal desorption system is high in integration level, the feeding unit, the discharging unit, the waste gas discharging unit and the auxiliary device are simply integrated with the heat treatment chamber, the feeding unit, the discharging unit, the waste gas discharging unit and the auxiliary device can be conveniently detached, and the transportation, the assembly and the operation maintenance are convenient.
(4) The operating process parameters can be flexibly adjusted, and the application range is wide. The processing capacity of the thermal desorption equipment can be adjusted by increasing or decreasing the number of the spiral propulsion furnace tubes and changing the rotating speed of the rotary feeder; the temperature of the thermal desorption system can be adjusted by changing the number of the fuel burners, the fuel supply amount and the temperature feedback adjustment system; the thermal desorption reaction time can be adjusted by changing the spiral propelling speed in the furnace tube, and the method is suitable for the organic polluted soil with different concentrations and different components.
Drawings
Fig. 1 is a front view of a multilayer graded integrated ex-situ thermal desorption device according to the present invention.
Fig. 2 is a side view of the multilayer graded integrated ex-situ thermal desorption device of the invention.
Fig. 3 is a top view of the multilayer graded integrated ex-situ thermal desorption device of the invention.
Wherein, 1-a feeding unit, 11-a material inlet, 12-a vibrating screen and 13-a rotary feeder; 2-first-stage heat treatment unit, 21-first-stage spiral propelling furnace tube, 22-smoke outlet, 23-first-stage feed inlet, 24-exhaust outlet and 25-first-stage discharge outlet; 3-a second-stage heat treatment unit, 31-a second-stage spiral propelling furnace tube, 32-a combustion chamber, 33-a second-stage feeding hole and 34-a second-stage discharging hole; 4-chamber connecting channel; 5-a discharging unit, 51-a rotary discharging machine, 52-a humidifying spray nozzle and 53-a water storage tank; 6-a combustion unit, 61-a fuel burner and 62-an air induced draft fan; 7-desorption waste gas discharge unit, 71-waste gas discharge pipe, 72-water spray device, 73-cold water nozzle, 74-safety valve; 8-auxiliary device, 81-rail, 82-ladder stand, 83-smoke exhaust pipeline, 84-backing plate, 85-gas sampling hole and 86-heat insulation material; 9-a temperature sensor; 10-a variable frequency motor; 11-speed reducer.
Detailed Description
The invention is further described below with reference to the figures and examples. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. The described embodiments are only some, but not all embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. In the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Example (b):
this embodiment provides a multilayer hierarchical integrated form ectopic thermal desorption device, as shown in fig. 1, fig. 2 and fig. 3, mainly includes: the device comprises a feeding unit 1, a primary heat treatment unit 2, a secondary heat treatment unit 3, a chamber connecting channel 4, a discharging unit 5, a combustion unit 6, a desorption waste gas discharge unit 7, an auxiliary device and the like.
The feeding unit 1 is characterized in that a material inlet 11 is formed in the upper portion of the feeding unit 1, a vibrating screen 12 is connected to the lower portion of the material inlet 11, and a rotary feeder 13 is arranged below the vibrating screen 12.
The middle part of the primary heat treatment unit 2 is a primary spiral propulsion furnace tube 21, the outside of the primary spiral propulsion furnace tube 21 is a high-temperature flue gas channel, the top of the left end of the primary heat treatment unit is provided with a smoke outlet 22, and the smoke outlet 22 is connected with the bottom of a smoke exhaust pipeline 83.
The middle part of the second-stage heat treatment unit 3 is a second-stage spiral propelling furnace tube 31, the outside of the second-stage spiral propelling furnace tube 31 is a high-temperature flue gas channel, and the lower part of the second-stage spiral propelling furnace tube is a combustion chamber 32.
The primary heat treatment unit 2 and the secondary heat treatment unit 3 are communicated 4 at the right end through a chamber connecting channel.
The discharging unit 5 comprises a rotary discharging machine 51, a humidifying spray nozzle 52, a water storage tank 53 and the like.
The combustion heating 6 system comprises a fuel burner 61, an air induced draft fan 62 and the like.
The desorption exhaust gas discharge unit 7 includes an exhaust gas discharge pipe 71, a water spray device 72, a cold water nozzle 73, a safety valve 74, and the like.
The auxiliary device comprises a rail 81, a ladder stand 82, a smoke exhaust pipeline 83, a base plate 84 and the like, wherein the smoke exhaust pipeline 83 is provided with a gas sampling hole 85, and the outer wall of the lower part of the smoke exhaust pipeline is provided with a heat insulating material 86.
The feeding unit 1, the discharging unit 5, the desorption waste gas discharging unit 7 and the auxiliary device are detachable, the primary heat treatment unit 2 and the secondary heat treatment unit 3 are skid-mounted modules, the outer wall of the skid-mounted modules is provided with the hoisting ring 87, transportation is convenient, and field assembly is simple.
The primary heat treatment unit 2 is stacked on the secondary heat treatment unit 3, a base plate 84 is laid at the top of the outer wall of the primary heat treatment unit, and a ladder stand 82 is laid on the side edge of the outer wall of the primary heat treatment unit to facilitate the passing of operation and maintenance personnel.
The number of the first-stage spiral propelling furnace tube 21 and the second-stage spiral propelling furnace tube 31 can be increased or decreased according to the requirement of the treatment capacity. In this embodiment, the number of the first-stage spiral propelling furnace tubes and the number of the second-stage spiral propelling furnace tubes are both 2.
Further, the aperture, the inclination angle and the vibration frequency of the screen mesh of the vibrating screen 12 can be flexibly adjusted according to the soil property and the process requirement.
Further, the rotary feeder 12 can adjust the speed of the material entering the primary heat treatment unit by changing the rotating speed, and isolate the primary spiral propelling furnace tube 21 from the outside air.
Furthermore, the inner walls of the primary heat treatment unit 2 and the secondary heat treatment unit 3 are both provided with refractory materials and heat-insulating materials.
Furthermore, the side walls of the first-stage heat treatment unit 2 and the second-stage heat treatment unit 3 are both provided with an inspection manhole, and an inspection manhole cover plate is connected with the side walls in a flange sealing mode.
Further, the primary spiral propelling furnace tube 21 and the secondary spiral propelling furnace tube 31 are both mainly composed of left and right side walls, a longitudinal heat conducting furnace wall, a transmission spiral middle shaft and spiral blades, and the materials of the primary spiral propelling furnace tube and the secondary spiral propelling furnace tube are 16Mn seamless steel tubes; the outer parts of the right side walls of the first-stage spiral propelling furnace tube 21 and the second-stage spiral propelling furnace tube 31 are respectively provided with an independent variable frequency motor 10 and a speed reducer 11, and the joint of a transmission shaft of the speed reducer 11 and the right side wall of the furnace tube is provided with a dynamic sealing device.
Furthermore, the material propelling direction in the first-stage spiral propelling furnace tube 21 is opposite to that in the second-stage spiral propelling furnace tube 31, the material in the first-stage spiral propelling furnace tube 21 moves from left to right, and the material in the second-stage spiral propelling furnace tube 31 moves from right to left. The temperature in the first-stage spiral propelling furnace tube 21 is 350-450 ℃, and the retention time of the materials is 10 min; the temperature in the secondary spiral propelling furnace tube 31 is 550-650 ℃, the material retention time is 10min, and both the temperature and the retention time can be adjusted according to the process requirements.
Further, a first-stage feeding hole 23 is formed in the upper portion of the left end of the first-stage spiral propelling furnace tube 21, and the first-stage feeding hole 23 is connected with the rotary feeder 13; the upper part of the right end of the first-stage spiral propelling furnace tube 21 is provided with an exhaust port 24, and the exhaust port 24 is connected with a waste gas discharge pipe 71; the lower part of the right end of the first-stage spiral propelling furnace tube 21 is provided with a first-stage discharge hole 25, and the first-stage discharge hole 25 is communicated with a second-stage feed hole 33 of the second-stage spiral propelling furnace tube 31.
Further, a second-stage feed inlet 33 is formed in the upper portion of the right end of the second-stage spiral propelling furnace tube 31, and the second-stage feed inlet 33 is communicated with the first-stage discharge outlet 25 of the first-stage spiral propelling furnace tube; the lower part of the left end of the secondary spiral propelling furnace tube 31 is provided with a secondary discharge hole 34.
Further, the chamber connecting channel 4 is in the form of an annular sleeve, consisting of an inner sleeve and an outer sleeve. The inner sleeve is communicated with the first-stage spiral propelling furnace tube 21 and the second-stage spiral propelling furnace tube 31, the material in the first-stage spiral propelling furnace tube 21 falls into the second-stage spiral propelling furnace tube 31 through the inner sleeve, and the desorption waste gas in the second-stage spiral propelling furnace tube 31 enters the first-stage spiral propelling furnace tube 21 through the inner sleeve, and then enters the desorption waste gas discharge unit 7. The outer sleeve is communicated with the primary heat treatment unit 2 and the secondary heat treatment unit 3, and high-temperature flue gas in the secondary heat treatment unit 3 enters the primary heat treatment unit 2 through the space between the inner sleeve and the outer sleeve and then enters the smoke exhaust pipeline 83 for high-altitude discharge.
Furthermore, the inner sleeve and the outer sleeve are connected by a corrugated pipe compensator and seal the interface, so that the phenomenon that the interface seal is damaged by the displacement generated by the expansion caused by heat and the contraction caused by cold of the pipe is prevented.
Further, the rotary discharging machine 51 is connected with the lower discharge port 34 at the left end of the secondary spiral propelling furnace tube 31, so that the material discharge can be realized, and the secondary spiral propelling furnace tube 31 is isolated from the outside air.
Further, the humidifying spray nozzle 52 is arranged below the rotary discharging machine 51 and is communicated with a water storage tank 53.
Furthermore, the liquid in the water storage tank 53 is water or a mixed solution of water, soil microorganisms and nutrient solution, so that the water content of the soil after thermal desorption treatment can be increased, or the fertilizer efficiency of the soil can be enhanced, and the use effect of the soil can be improved.
Further, the fuel burners 61 are provided with a fuel inlet, an air inlet, a pressure regulating valve, an operation valve, a safety valve, an ignition valve, a flame detector, a combustion controller and other valve groups, and the number of the fuel burners can be determined according to the processing scale and the heat demand.
Still further, the fuel type may be gas or oil.
Further, an adjustable air door and an air filter screen are arranged at the inlet of the air induced draft fan 62.
Further, the exhaust gas discharge pipe 71 is connected to the upper exhaust port 24 at the right end of the primary spiral propelling furnace tube 21, and the exhaust gas generated in the thermal desorption process enters the water spraying device 72 through the exhaust gas discharge pipe 71.
Further, the water spraying device 72 can perform quenching, cooling and dedusting on the waste gas, the waste gas after spraying treatment enters a waste gas treatment facility for further purification and then is discharged after reaching the standard, and the generated spraying wastewater enters a waste water treatment facility for recycling or discharging after reaching the standard after treatment.
Further, a safety valve 74 is arranged beside the exhaust gas discharge pipe, and when the system is overpressurized, the exhaust gas is decompressed through the safety valve 74.
Further, the positions of the first-stage heat treatment unit 2, the second-stage heat treatment unit 3, the first-stage feeding hole 23, the first-stage discharging hole 25, the second-stage feeding hole 33, the second-stage discharging hole 34, the waste gas exhaust port 24, the smoke exhaust pipeline 83 and the like are all provided with temperature sensors 9, and technological parameters such as the temperature in the thermal desorption device, the spraying water quantity and the like can be adjusted in a feedback mode.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (10)
1. A multilayer grading integrated ectopic thermal desorption device is characterized in that the thermal desorption device comprises a feeding unit, a primary heat treatment unit, a secondary heat treatment unit, a cavity connecting channel, a discharging unit, a combustion unit and a desorption waste gas discharge unit;
the upper part of the feeding unit is a material inlet, a vibrating screen is connected below the material inlet, and a rotary feeder is arranged below the vibrating screen;
the middle part of the primary heat treatment unit is provided with a primary spiral propelling furnace tube, the outside of the primary spiral propelling furnace tube is provided with a high-temperature flue gas channel, the primary spiral propelling furnace tube at the starting end of the primary heat treatment unit is provided with a feed inlet matched with the rotary feeder, the top of the high-temperature flue gas channel is provided with a smoke outlet, and the smoke outlet is connected with the bottom of a smoke exhaust pipeline; the top of the primary spiral propelling furnace tube at the tail end of the primary heat treatment unit is provided with an exhaust port, and the exhaust port is connected with the desorption waste gas discharge unit;
the second-stage heat treatment unit is positioned below the first-stage heat treatment unit and communicated with the first-stage heat treatment unit through a cavity connecting channel, and a second-stage spiral propelling furnace tube is arranged in the middle of the second-stage heat treatment unit; the outer part of the secondary spiral propelling furnace tube is provided with a high-temperature flue gas channel which is communicated with the high-temperature flue gas channel on the outer part of the primary spiral propelling furnace tube, and the lower part of the secondary spiral propelling furnace tube is provided with a combustion chamber;
the combustion unit is provided with a combustion nozzle, and the combustion nozzle faces towards the combustion chamber at the lower part of the secondary spiral propelling furnace tube;
the discharging unit is arranged at the tail end of the secondary heat treatment unit and comprises a rotary discharging machine, a humidifying spray nozzle matched with a discharging port of the rotary discharging machine, and a water storage tank connected with the humidifying spray nozzle.
2. The multi-layer graded integrated ex-situ thermal desorption device as claimed in claim 1, wherein the smoke exhaust pipeline is provided with gas sampling holes, and the outer wall of the lower part of the smoke exhaust pipeline is provided with a heat insulating material.
3. The multi-layered graded integrated ex-situ thermal desorption device according to claim 1, wherein the inner walls of the primary heat treatment unit and the secondary heat treatment unit are provided with refractory materials and heat preservation materials.
4. The multi-layer graded integrated ex-situ thermal desorption device according to claim 1, wherein the primary spiral propelling furnace tube and the secondary spiral propelling furnace tube respectively comprise a left side wall, a right side wall, a longitudinal heat conducting furnace wall, a transmission spiral middle shaft and spiral blades; the outer parts of the right side walls of the primary spiral propelling furnace tube and the secondary spiral propelling furnace tube are respectively provided with an independent variable frequency motor and a speed reducer, and a dynamic sealing device is arranged at the joint of a transmission shaft of the speed reducer and the right side wall of the furnace tube.
5. The multilayer graded integrated ex-situ thermal desorption device of claim 1, wherein a primary feed inlet is arranged at the upper part of the left end of the primary spiral propelling furnace tube, and the primary feed inlet is connected with a rotary feeder; the upper part of the right end of the primary spiral propelling furnace tube is provided with an exhaust port, and the exhaust port is connected with a waste gas discharge pipe; the lower part of the right end of the primary spiral propelling furnace tube is provided with a primary discharge hole; the upper part of the right end of the second-stage spiral propelling furnace tube is provided with a second-stage feeding hole, the first-stage discharging hole is communicated with the second-stage feeding hole of the second-stage spiral propelling furnace tube, and the second-stage feeding hole is communicated with the first-stage discharging hole of the first-stage spiral propelling furnace tube; and a second-stage discharge hole is formed in the lower part of the left end of the second-stage spiral propelling furnace tube.
6. The multi-layer graded integrated ex-situ thermal desorption device according to claim 1, wherein the chamber connecting channel is in the form of an annular sleeve and is composed of an inner sleeve and an outer sleeve, the inner sleeve is communicated with the primary spiral propelling furnace tube and the secondary spiral propelling furnace tube, the material in the primary spiral propelling furnace tube falls into the secondary spiral propelling furnace tube through the inner sleeve, and the desorption waste gas in the secondary spiral propelling furnace tube enters the primary spiral propelling furnace tube through the inner sleeve and further enters the desorption waste gas discharge unit;
the outer sleeve is communicated with high-temperature flue gas channels of the primary heat treatment unit and the secondary heat treatment unit, and high-temperature flue gas in the secondary heat treatment unit enters the primary heat treatment unit through the space between the inner sleeve and the outer sleeve and then enters the smoke exhaust pipeline for high-altitude discharge.
7. The multi-layered staged integrated ex-situ thermal desorption apparatus according to claim 6, wherein the inner casing and the outer casing are connected by a bellows compensator and the interface is sealed.
8. The multi-layer graded integrated ex-situ thermal desorption device according to claim 1, wherein the desorption exhaust gas discharge unit comprises an exhaust gas discharge pipe, a water spray device, a cold water nozzle and a safety valve, the water spray device can perform quenching, cooling and dedusting on the exhaust gas, the sprayed and processed exhaust gas enters an exhaust gas treatment facility for further purification and then reaches the standard for discharge, the generated spraying wastewater enters a wastewater treatment facility for recycling or reaching the standard for discharge, the safety valve is arranged beside the exhaust gas discharge pipe, and when the system is in overpressure, the exhaust gas is decompressed through the safety valve.
9. The multi-layer graded integrated ex-situ thermal desorption device as claimed in claim 1, wherein the primary heat treatment unit, the secondary heat treatment unit, the primary inlet, the primary outlet, the secondary inlet, the secondary outlet, the exhaust outlet and the smoke exhaust pipeline are all provided with temperature sensors for feedback regulation of temperature in the thermal desorption device.
10. The multi-layer graded integrated ex-situ thermal desorption device according to claim 1, wherein the combustion unit further comprises an air induced draft fan, and an adjustable air door and an air filter screen are arranged at an inlet of the air induced draft fan.
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