CN108772414B - Mercury removal and separation device for modularized soil mercury removal device - Google Patents
Mercury removal and separation device for modularized soil mercury removal device Download PDFInfo
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- CN108772414B CN108772414B CN201810780438.4A CN201810780438A CN108772414B CN 108772414 B CN108772414 B CN 108772414B CN 201810780438 A CN201810780438 A CN 201810780438A CN 108772414 B CN108772414 B CN 108772414B
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- screw conveyor
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- container
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- 239000002689 soil Substances 0.000 title claims abstract description 63
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 229910052753 mercury Inorganic materials 0.000 title claims abstract description 59
- 238000000926 separation method Methods 0.000 title claims abstract description 20
- 238000002485 combustion reaction Methods 0.000 claims abstract description 96
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 238000009423 ventilation Methods 0.000 claims abstract description 10
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 claims description 39
- 238000001179 sorption measurement Methods 0.000 claims description 35
- 230000005540 biological transmission Effects 0.000 claims description 29
- 239000007788 liquid Substances 0.000 claims description 22
- 230000017525 heat dissipation Effects 0.000 claims description 18
- 229910000746 Structural steel Inorganic materials 0.000 claims description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 15
- 229910052799 carbon Inorganic materials 0.000 claims description 11
- 229920000742 Cotton Polymers 0.000 claims description 6
- 239000000919 ceramic Substances 0.000 claims description 6
- 239000000835 fiber Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000002699 waste material Substances 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 150000002731 mercury compounds Chemical class 0.000 claims description 5
- 239000000428 dust Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 238000003795 desorption Methods 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 claims description 2
- 239000002351 wastewater Substances 0.000 claims description 2
- 230000000630 rising effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 5
- 229910000831 Steel Inorganic materials 0.000 description 16
- 239000010959 steel Substances 0.000 description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000000446 fuel Substances 0.000 description 8
- 230000007246 mechanism Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000005507 spraying Methods 0.000 description 3
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 2
- 210000004907 gland Anatomy 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 210000002445 nipple Anatomy 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000004720 fertilization Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Gasification And Melting Of Waste (AREA)
Abstract
The invention discloses a mercury removal separation device for a modularized soil mercury removal device, which comprises a combustion chamber and a main screw conveyor, wherein the main screw conveyor penetrates through the combustion chamber and is detachably and fixedly connected to the combustion chamber, the inlet end of the main screw conveyor is connected to a hopper through a feeding pipeline, the outlet end of the main screw conveyor extends out of the combustion chamber and is detachably connected with an inclined screw conveyor, the hopper is detachably connected to a supporting frame, the supporting frame is detachably connected above a container, the combustion chamber is arranged in the container, the main screw conveyor comprises a main screw shell and a main screw shaft arranged in the main screw shell, a plurality of strip-shaped ventilation through holes which are arranged at intervals along the length direction of the main screw shell are formed in the middle part of the upper side of the main screw shell, a sealed air collecting cavity is arranged outside the strip-shaped ventilation through holes, an exhaust pipe is arranged above the air collecting cavity, and the exhaust pipe is communicated to an exhaust fan. The invention has large heating area, full heating and good separation effect, and the plurality of strip-shaped through holes are used for negative pressure discharge.
Description
Technical Field
The invention belongs to the technical field of soil pollution removal equipment, and particularly relates to a mercury removal separation device for a modularized soil mercury removal device.
Background
Mercury is widely used in industry and agriculture due to its unique physical properties and toxicity, but the mercury-containing waste discharged by untreated mercury in the past causes serious environmental pollution. Dry and wet sedimentation of atmospheric mercury, sewage irrigation, sludge fertilization, accumulation of mercury-containing solid waste, and use of organic mercury pesticides and mercury-containing fertilizers are all main artificial sources of mercury entering the soil environment. Since most of these sources of pollution are point sources of pollution, they are non-uniform pollution to the soil environment and mercury pollution of the soil in localized areas can be quite serious.
The mercury separation device of the existing polluted soil mercury removal device has the defects of small separation heating surface, insufficient heating and poor separation effect during mercury separation.
Disclosure of Invention
The invention solves the technical problems that: a mercury removal and separation apparatus for a modular soil mercury removal apparatus is provided to address the problems of the prior art described above.
The technical scheme adopted by the invention is as follows: the utility model provides a demercuration separator for modularization soil demercuration device, including combustion chamber and main screw conveyer, main screw conveyer passes the combustion chamber and detachably fixed connection is on the combustion chamber, main screw conveyer entry end is connected to the hopper through the charge-in pipeline, the exit end stretches out the inclined screw conveyer of detachably connection behind the combustion chamber, the hopper detachably connects on braced frame, braced frame detachably connects in the container top, the combustion chamber is installed in the container, main screw conveyer includes main screw casing and arranges the main screw shaft in the main screw casing, a plurality of bar ventilative through-holes of interval arrangement along main screw casing length direction have been seted up at main screw casing upside middle part, a plurality of bar ventilative through-holes are provided with sealed gas collecting chamber outward, there is the blast pipe gas collecting chamber top, the blast pipe is linked to the exhaust fan.
Preferably, the combustion chamber comprises a combustion cavity, a gas burner and a chimney, wherein the top of the combustion cavity is connected with the chimney, the gas burner is detachably arranged at the bottom of the right end, the front end and the rear end of the combustion cavity respectively, the right-end gas burner is opposite to the center, and the front end and the rear end of the gas burner are inclined towards the left end of the combustion cavity and are kept in staggered arrangement.
Preferably, a heat dissipation plate positioned above the gas burner is arranged in the combustion cavity, and is hung on the hook through a connecting rod, and the hook is fixedly connected to the main screw conveyor.
Preferably, the combustion cavity comprises a front plate group, a rear plate group, a left plate group, a right plate group, a top plate group and a bottom plate group, wherein the front plate group, the rear plate group, the left plate group and the right plate group are fixedly connected to form a long strip flat frame-shaped structure, the top plate group and the bottom plate group are fixedly connected to the upper end and the lower end of the frame-shaped structure, the front plate group, the rear plate group, the left plate group, the right plate group, the top plate group and the bottom plate group are hollow structures, and an insulating layer made of ceramic fiber cotton is arranged inside the hollow structures.
Preferably, the right end of the main screw shaft is connected to an output shaft of a first transmission through a coupling, an input shaft of the first transmission is connected to a variable-frequency driving motor I through belt transmission, the driving motor I is fixedly connected to a motor fixing frame, and the first transmission is fixedly connected to the right end of the main screw shell.
Preferably, the motor fixing frame is fixedly connected in the container, the lower end is provided with the position adjusting device, the position adjusting device comprises two symmetrical angle steel I connected with the motor fixing frame and two symmetrical angle steel II fixedly connected on the container, the two symmetrical angle steel I is oppositely arranged downwards to form a groove, the two symmetrical angle steel II is oppositely arranged upwards to form a groove, the two symmetrical angle steel II is embedded into the two symmetrical angle steel I, the two symmetrical angle steel I is provided with a bolt, the two symmetrical angle steel II corresponding to the bolt is provided with a horizontal bar-shaped through hole, the bolt is inserted into the horizontal bar-shaped through hole, the middle side of the bottom of the motor fixing frame is provided with a rotatable adjusting screw, the adjusting screw penetrates through a fixing plate and is locked by adopting two nuts, and the fixing plate is fixedly connected on the container.
The invention has the beneficial effects that: compared with the prior art, the invention has the following effects:
(1) According to the invention, the spiral conveyor is adopted to convey soil, the soil is placed in the combustion chamber to be heated at high temperature, the heated area is large, the soil is fully heated, the soil is separated from the air collecting cavity with negative pressure above the spiral shell, the negative pressure is discharged through the plurality of strip-shaped through holes, and the separation effect is good;
(2) The main screw conveyor is adopted to convey the polluted soil, so that the polluted soil is convenient to control to stay in the combustion chamber section for a long time, organic matters and mercury can be fully separated from the soil, and the inclined screw conveyor is adopted to lift the treated soil to a certain height, so that the soil is convenient to collect and transport;
(3) The arrangement mode of the gas burner is that one gas burner is arranged at the feeding end of the combustion chamber, the other two gas burners are arranged on the front side surface and the rear side surface of the combustion chamber in a staggered way, so that the turbulent flow of hot air formed in the combustion chamber can be ensured when the combustion chamber works, the uniformity of heating in the length and width directions of the main screw conveyor in the combustion chamber can be ensured, the main screw conveyor for conveying polluted soil can be uniformly heated, the conveyed polluted soil is uniformly heated, and the mercury removal effect is better;
(4) A heat dissipation plate is arranged above the flame of the gas burner and below the main screw conveyor, and when the gas burner works, hot air is blocked by the heat dissipation plate and then diffuses upwards so as to ensure that the space above the heat dissipation plate is heated uniformly;
(5) The combustion cavity with the strip flat frame-shaped structure is convenient for arranging the main screw conveyor, ensures the heating temperature length and the residence time of polluted soil, is more thorough in mercury removal treatment, and can ensure that the temperature outside the combustion chamber is not more than 60 ℃ by arranging the heat-insulating layer of ceramic fiber cotton, so that the energy consumption is effectively reduced;
(6) The upper side of the main spiral shell is provided with a plurality of strip-shaped ventilation through holes and a sealed air collecting cavity, so that mercury in polluted soil after high-temperature heating, water in the soil, volatile organic matters (if any) and a small part of soil dust can be conveniently collected, the collecting surface is large, and the collection is more sufficient;
(7) The main screw conveyor is driven to operate after multiple decelerations of the belt transmission mechanism and the decelerator so as to achieve that the main screw conveyor operates at a certain speed, and the belt transmission mechanism can prevent equipment damage and safety accidents caused by large stones entering the main screw conveyor;
(8) The position adjusting device is arranged, the bolt and the two nuts are loosened, the adjusting nuts move back and forth and push the motor frame to move back and forth, so that the position of the motor frame is adjusted, the tightness of the belt is adjusted, and the bolt plays a role in adjusting orientation and fastening.
Drawings
FIG. 1 is a schematic diagram of a mercury removal apparatus;
fig. 2 is a schematic diagram of a left-hand structure of the mercury removal apparatus;
FIG. 3 is a schematic cross-sectional view of A-A of FIG. 1;
FIG. 4 is a schematic view of the cross-sectional structure B-B of FIG. 1;
FIG. 5 is a schematic diagram of a mercury removal separation apparatus;
FIG. 6 is a schematic view of a combustion chamber configuration;
FIG. 7 is a schematic view of the cross-sectional structure of A-A in FIG. 6;
FIG. 8 is a schematic top view of a combustion chamber;
FIG. 9 is a schematic top cross-sectional view of a combustion chamber;
FIG. 10 is a schematic view of the main screw conveyor structure;
FIG. 11 is a schematic top view of the main screw conveyor;
FIG. 12 is a schematic left-hand structural view of the main screw conveyor;
FIG. 13 is a schematic view of a connection structure of the main screw conveyor and the driving motor;
FIG. 14 is a schematic side view of a drive motor and motor mount;
FIG. 15 is a schematic view of the structure of the inclined screw conveyor;
fig. 16 is a schematic diagram of the principle structure of the mercury removal apparatus.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific examples.
Example 1: as shown in fig. 5-14, a mercury removal and separation device for a modularized soil mercury removal device comprises a combustion chamber 1 and a main screw conveyor 2, wherein the main screw conveyor 2 penetrates through the combustion chamber 1 and is detachably and fixedly connected to the combustion chamber 1, an inlet end of the main screw conveyor 2 is connected to a hopper 7 through a feeding pipeline 6, an outlet end of the main screw conveyor 2 extends out of the combustion chamber 1 and is detachably connected with an inclined screw conveyor 3, the hopper 7 is detachably connected to a supporting frame 8, the supporting frame 8 is detachably connected above a container 9, the combustion chamber 1 is installed in the container 9, the main screw conveyor 2 comprises a main screw housing 201 and a main screw shaft 202 arranged in the main screw housing 201, screw blades are arranged on the main screw shaft 202, a plurality of strip-shaped ventilation through holes 203 which are arranged at intervals along the length direction of the main screw housing 201 are arranged in the middle of the upper side of the main screw housing 201, a plurality of strip-shaped ventilation through holes 203 are arranged in the outside, a sealed air collecting cavity 204 is arranged, an exhaust pipe 205 connected with a heat exchanger 4 is arranged above the air collecting cavity 204, the exhaust pipe 205 is communicated to an exhaust fan 502, the main screw conveyor 2 has a longer length, and the main screw conveyor 2 is arranged to be in a short pitch enough to ensure that the main screw system can fully separate soil from the soil and the mercury in the screw system when the main screw system can stay in the long time.
Preferably, as shown in fig. 5-9, the above-mentioned combustion chamber 1 includes a combustion chamber 101, a gas burner 102 and a chimney 103, where the top of the combustion chamber 101 is connected with the chimney 103, the gas burner 102 is detachably installed at the right end, front end and rear end bottoms of the combustion chamber 101 respectively, the right end gas burner 102 is opposite to the center, the front and rear ends incline toward the left end of the combustion chamber 101 and keep staggered, the front and rear sides of the combustion chamber 101 are provided with an access door 114 and a plurality of observation windows 116 to facilitate the inspection and check of the interior of the combustion chamber, the front side of the combustion chamber 101 is provided with two heat removal couples 115, the two heat removal couples 115 are located above and below the main screw conveyor 2 respectively to detect and monitor whether the main screw conveyor is heated uniformly and automatically to control whether the burner works, the fuel is supplied to the burner air inlet of the system, the pressure of the fuel to the burner air inlet is reduced to 20-50mbar, and the fuel adopts acetylene fuel.
Preferably, the combustion chamber 101 is internally provided with three heat dissipation plates 104 made of refractory materials and positioned above the flame of the gas burner 102, the heat dissipation plates 104 are hung on hooks 106 through connecting rods 105, the hooks 106 are fixedly connected to the main screw conveyor 2, and when the burner works, hot air is blocked by the heat dissipation plates and then diffuses upwards, so that the space above the heat dissipation plates is uniformly heated.
Preferably, the combustion chamber 101 is a cuboid, the size is 4000 mm×1000 mm×1850 mm, and includes a front plate group 107, a rear plate group 108, a left plate group 109, a right plate group 110, a top plate group 111 and a bottom plate group 112, the front plate group 107, the rear plate group 108, the left plate group 109 and the right plate group 110 are fixedly connected into a long flat frame structure, the top plate group 111 and the bottom plate group 112 are fixedly connected at the upper end and the lower end of the frame structure, the front plate group 107, the rear plate group 108, the left plate group 109, the right plate group 110, the top plate group 111 and the bottom plate group 112 are hollow structures, a heat insulation layer 113 made of ceramic fiber cotton is arranged inside, the thickness of the heat insulation layer is 150mm, a connecting pipe 117 with a flange plate for connecting a chimney is arranged at the left side of the top of the combustion chamber 101, two through holes for penetrating into a pipeline are arranged at the right side of the top, and a sealing gland 118 is arranged on the connecting hole.
The right end of the main screw shaft 202 is connected to the output shaft of the first transmission 215 through a coupling 218, the input shaft of the first transmission 215 is connected to the first variable-frequency driving motor 206 through a belt transmission, the first driving motor 206 is fixedly connected to the motor fixing frame 207, the first transmission 215 is fixedly connected to the connecting frame of the right end part of the main screw housing 201 through the flange plate of the left end of the first transmission, the connecting frame comprises a square frame 216 fixedly connected with the main screw housing 201 and a connecting flange 217 fixedly connected with the connecting square frame 216 and the flange plate, the main screw conveyor is driven to operate after multiple decelerations through a belt transmission mechanism and a decelerator so as to achieve that the main screw conveyor operates at a certain speed, in order to prevent equipment damage and safety accidents caused by large stones entering the main screw conveyor, the decelerations are provided with a belt and a pulley transmission, the motor fixing frame 207 is fixedly connected in the container 9, the lower end is provided with a position adjusting device, the position adjusting device comprises two symmetrical angle iron I208 connected with a motor fixing frame 207 and two symmetrical angle iron II 209 fixedly connected with a container 9, the two symmetrical angle iron I208 is oppositely downwards arranged to form a groove, the two symmetrical angle iron II 209 is oppositely upwards arranged to form a groove, the two symmetrical angle iron II 209 is embedded into the two symmetrical angle iron I208, the two symmetrical angle iron I208 is provided with a bolt 210, the two symmetrical angle iron II 209 corresponding to the bolt 210 is provided with a horizontal bar-shaped through hole 211, the bolt 210 is inserted into the horizontal bar-shaped through hole 211, the middle side of the bottom of the motor fixing frame 207 is provided with a rotatable adjusting screw 212, the adjusting screw 212 penetrates through a fixing plate 213 and is locked by adopting two nuts 214, the fixing plate 213 is fixedly connected with the container 9, the adjusting screw and the two nuts are loosened to move forwards and backwards to push the motor frame to move forwards and backwards, thereby realizing the position adjustment of the motor frame and the tightness adjustment of the belt.
Example 2: as shown in fig. 1 to 16, a modularized soil mercury removal device comprises a combustion chamber 1, a main screw conveyor 2, an inclined screw conveyor 3, a heat exchanger 4 and an adsorption device 5, wherein the main screw conveyor 2 penetrates through the combustion chamber 1 and is detachably and fixedly connected to the combustion chamber 1, the inlet end of the main screw conveyor 2 is connected to a hopper 7 through a feeding pipeline 6, the outlet end of the main screw conveyor 2 is detachably connected to the inclined screw conveyor 3, the hopper 7 is detachably connected to a supporting frame 8, the supporting frame 8 is detachably connected to the upper side of a container 9, the combustion chamber 1 is detachably installed in the container 9, the discharge end of the inclined screw conveyor 3 extends out of the container 9 and is detachably fixed with the container 9, the heat exchanger 4 is detachably connected to the supporting frame 8, the inlet penetrates into the combustion chamber 1 through a pipeline and is connected to the main screw conveyor 2, the outlet is connected to the adsorption device 5 through a pipeline, the adsorption device 5 is detachably and fixedly connected to the supporting frame 8, a rain-proof shed is arranged at the top of the supporting frame 8, a stair 14 is arranged on the side of the supporting frame 14, a guardrail 15 is arranged beside the stair 14, and a grid mesh is arranged at the bottom of the supporting frame 8.
Preferably, as shown in fig. 5-10, the above-mentioned combustion chamber 1 includes a combustion chamber 101, a gas burner 102 and a chimney 103, where the top of the combustion chamber 101 is connected with the chimney 103, the gas burner 102 is detachably installed at the right end, front end and rear end bottoms of the combustion chamber 101 respectively, the right end gas burner 102 is opposite to the center, the front and rear ends incline toward the left end of the combustion chamber 101 and keep staggered, the front and rear sides of the combustion chamber 101 are provided with an access door 114 and a plurality of observation windows 116 to facilitate the inspection and check of the interior of the combustion chamber, the front side of the combustion chamber 101 is provided with two heat removal couples 115, the two heat removal couples 115 are located above and below the main screw conveyor 2 respectively to detect and monitor whether the main screw conveyor is heated uniformly and automatically to control whether the burner works, the fuel is supplied to the burner air inlet of the system, the pressure of the fuel to the burner air inlet is reduced to 20-50mbar, and the fuel adopts acetylene fuel.
Preferably, the above-mentioned combustion chamber 101 is internally provided with three heat dissipation plates 104 made of refractory materials and located above the flame of the gas burner 102, the heat dissipation plates 104 are hung on the hooks 106 through the connecting rods 105, the hooks 106 are fixedly connected to the main screw conveyor 2, the upper ends of the connecting rods 105 are provided with step shafts, the step shafts penetrate through the upper through holes of the hooks 106, the lower ends penetrate through the heat dissipation plates and then are limited and prevented from falling by bolts, and when the burner works, hot air is blocked by the heat dissipation plates and then diffuses upwards, so that the space above the heat dissipation plates is uniformly heated.
Preferably, the combustion chamber 101 is a cuboid, the size is 4000 mm×1000 mm×1850 mm, and includes a front plate group 107, a rear plate group 108, a left plate group 109, a right plate group 110, a top plate group 111 and a bottom plate group 112, the front plate group 107, the rear plate group 108, the left plate group 109 and the right plate group 110 are fixedly connected into a long flat frame structure, the top plate group 111 and the bottom plate group 112 are fixedly connected at the upper end and the lower end of the frame structure, the front plate group 107, the rear plate group 108, the left plate group 109, the right plate group 110, the top plate group 111 and the bottom plate group 112 are hollow structures, a heat insulation layer 113 made of ceramic fiber cotton is arranged inside, the thickness of the heat insulation layer is 150mm, a connecting pipe 117 with a flange plate for connecting a chimney is arranged at the left side of the top of the combustion chamber 101, two through holes for penetrating into a pipeline are arranged at the right side of the top, and a sealing gland 118 is arranged on the connecting hole.
Preferably, as shown in fig. 10-14, the main screw conveyor 2 comprises a main screw housing 201 and a main screw shaft 202 arranged in the main screw housing 201, screw blades are arranged on the main screw shaft 202, a plurality of strip-shaped ventilation through holes 203 are arranged at intervals along the length direction of the main screw housing 201 in the middle of the upper side of the main screw housing 201, a sealed air collection cavity 204 is arranged outside the plurality of strip-shaped ventilation through holes 203, an exhaust pipe 205 connected with a heat exchanger 4 is arranged above the air collection cavity 204, the main screw conveyor 2 has a longer length and a shorter screw pitch is arranged, so as to ensure that polluted soil stays in the main screw for a long time when the system works normally, organic matters and mercury can be fully separated from the soil, the right end of the main screw shaft 202 is connected to an output shaft of a first transmission 215 through a coupling 218, the input shaft of the transmission I215 is connected to the variable-frequency driving motor I206 through a belt transmission, the driving motor I206 is fixedly connected to the motor fixing frame 207, the transmission I215 is fixedly connected to the connecting frame at the right end part of the main spiral shell 201 through the flange plate at the left end of the transmission I215, the connecting frame comprises a square frame 216 fixedly connected with the main spiral shell 201 and a connecting flange 217 fixedly connected with the connecting square frame 216 and the flange plate, the main spiral conveyor is driven to operate after multiple decelerations through a belt transmission mechanism and a decelerator so as to achieve that the main spiral conveyor operates at a certain speed, a belt and a belt pulley transmission are arranged at a deceleration part for preventing equipment damage and safety accidents caused by large stones entering the main spiral conveyor, the motor fixing frame 207 is fixedly connected in the container 9, a position adjusting device is arranged at the lower end of the motor fixing frame, the position adjusting device comprises two symmetrical angle steel I208 connected with the motor fixing frame 207 and two symmetrical angle steel II 209 fixedly connected to the container 9, wherein the two symmetrical angle steel I208 is oppositely downwards arranged to form a groove, the two symmetrical angle steel II 209 is oppositely upwards arranged to form a groove, the two symmetrical angle steel II 209 is embedded into the two symmetrical angle steel I208, a bolt 210 is arranged on the two symmetrical angle steel I208, a horizontal strip-shaped through hole 211 is arranged on the two symmetrical angle steel II 209 corresponding to the bolt 210, the bolt 210 is inserted into the horizontal strip-shaped through hole 211, a rotatable adjusting screw 212 is arranged on the middle side of the bottom of the motor fixing frame 207, the adjusting screw 212 penetrates through a fixing plate 213 and is locked by adopting two nuts 214, the fixing plate 213 is fixedly connected to the container 9, the bolt and the two nuts are loosened, and the adjusting nuts are moved forwards and backwards to push the motor frame to adjust the position of the motor frame, so that tightness adjustment of a belt is realized.
Preferably, as shown in fig. 15, the above-mentioned inclined screw conveyor 3 includes an inclined screw housing 301 and an inclined screw shaft 302 disposed in the inclined screw housing 301, a large-pitch screw pushing blade is disposed on the inclined screw shaft 302, a connecting pipe 303 connected to the discharge port of the main screw conveyor 2 is disposed at the feed end of the inclined screw housing 301, the connecting pipe 303 is connected to the vertical main discharge pipe of the discharge port of the main screw conveyor 2 through a flange plate, the outer end of the inclined screw shaft 302 is connected to the output shaft of a transmission II 308 through a coupling, the transmission II 308 is fixedly connected to the inclined screw housing 301, the input shaft is connected to a driving motor II 303 through a belt transmission mechanism, the driving motor II 303 is fixedly connected to the upper side of a transmission II 308 connected to the end of the inclined screw housing 301 through a motor frame 304, the bottom side of the inclined screw housing 301 is provided with a supporting leg 307 located outside the container 9, the side wall of the discharge pipe 305 at the outer end of the inclined screw housing 301 is provided with a spraying pipe 306, the spraying pipe 306 is connected to a water pump, the spraying pump is connected to a water tank, the motor frame 304 includes an upper supporting plate 309, a lower supporting plate 310 and a lower supporting plate 310 are connected to a lower supporting plate 311 and a lower supporting plate 310, a lower supporting plate 310 is connected to a supporting plate 310 and a lower supporting plate 310 is provided with a supporting plate 310 and a lower supporting plate 314 is connected to a supporting plate 310 and a lower supporting plate 310 through a transmission groove 313, a connecting rod 310 and a connecting rod 313 is fixedly connected to a lower supporting plate 310 and a connecting rod 310 is fixedly to a connecting rod 313.
Preferably, as shown in fig. 1-4, a liquid collecting tank 10 is connected below the heat exchanger 4, a water pump 11 is connected to a condensation pipe 13 in the liquid collecting tank, a water tank 12 is connected to the water pump 11, the condensation pipe 13, the water pump 11 and the water tank 12 form a closed loop, the water tank 12 is connected to a tap water pipe 16, the heat exchanger 4 adopts a fin type heat exchanger, and according to the gas treatment characteristics of mercury and mercury compounds, a fin type heat exchanger with compact structure is adopted to ensure that the outlet temperature of the heat exchanger is not higher than 40 ℃, and a valve and a liquid conveying pipeline are arranged at the bottom of the liquid collecting tank below the heat exchanger, so that waste liquid desorbed from the soil can be conveniently transferred.
After the gas coming out of the upper part of the collecting box of the heat exchanger is adsorbed together by the potassium iodide adsorption tank and the secondary active carbon adsorption tank, mercury and mercury compounds are adsorbed, harmless gas enters an exhaust fan (induced draft fan), and the induced draft fan provides power for separating organic matters and mercury from soil and exhausting the gas into the atmosphere.
Preferably, the above-mentioned adsorption device 5 includes two potassium iodide adsorption tanks 501 that concatenate, install exhaust fan 502 on the outlet duct of the last potassium iodide adsorption tank 501, exhaust fan 502 installs in container 9, still concatenate active carbon adsorption tank 503 before the exhaust fan 502, active carbon adsorption tank 503 detachably connects in container 1, exhaust fan 502 is connected to exhaust pipe 504, exhaust pipe 504 stretches into the atmosphere, be provided with the valve on the business turn over pipe of every potassium iodide adsorption tank 501 and active carbon adsorption tank 503, and be provided with the nipple, also be provided with the valve on the nipple, be convenient for realize different situation absorption, every potassium iodide adsorption tank 501 and active carbon adsorption tank 503 are discharged into the wastewater tank through drain pipe 17.
Preferably, the hopper is provided with a material conveying device, the material conveying device comprises a fixed pulley and a support frame, the fixed pulley is rotatably connected to the support frame, and the support frame is rotatably connected to the edge of the support frame.
The mercury removal device separates organic matters, mercury and mercury compounds and moisture in the polluted soil from the soil in a low-temperature indirect heating mode, so that the polluted soil is repaired and treated; the substances separated from the soil are subjected to gas-liquid separation by a heat exchanger, then liquid is collected and then subjected to centralized treatment (the owner takes charge of treatment), and the gas is cooled by the heat exchanger, adsorbed by potassium iodide and adsorbed by secondary activated carbon and then discharged to the atmosphere by an induced draft fan.
Example 3: a mercury removal method of a modularized soil mercury removal device comprises the following steps: the polluted soil enters the right end of the main screw conveyor 2 through a hopper 7 and a charging gate valve arranged on a connecting pipe below the hopper, the polluted soil is conveyed to the section of the main screw conveyor 2 in the combustion chamber 1 in the conveying process of the main screw conveyor 2, the main screw conveyor 2 and the combustion chamber 1 form a high-temperature separation chamber, in the separation chamber, mercury and mercury compounds are vaporized at high temperature when the combustion chamber heats the soil to more than 360 ℃, the mercury, moisture, volatile organic matters and a small part of soil dust contained in the soil are subjected to the combined action of the cooling of a heat exchanger positioned above a separation and taking chamber and the extraction of an exhaust fan connected with an adsorption device of the heat exchanger, and finally the liquid is concentrated in a liquid collecting box below the heat exchanger, and after the liquid is collected, the liquid is concentrated and treated by a user; the cooled gas is discharged into the atmosphere through an exhaust fan after being adsorbed together in a potassium iodide adsorption tank and an active carbon adsorption tank, and organic matters and mercury are removed after thermal desorption, and under the rotary pushing of a main screw conveyor 2, the cooled gas enters an inclined screw conveyor 3 from the lower part of the tail part of the main screw conveyor 2, is lifted and conveyed to an outer area of a container 9 and is discharged, mercury-containing waste liquid in a liquid collecting box is conveyed to a sealing container through a pipeline after the polluted soil is treated by the system, and is conveyed to a unit specially used for treating the waste liquid for harmless treatment, so that the whole system is ensured to be in a closed-loop running state, and the purposes of soil remediation and no secondary pollution to the environment are achieved;
the combustion operation steps of the combustion chamber are as follows:
(1) The first stage of furnace starting and heating of the combustion chamber comprises the steps of starting and burning of three burners, controlling the right-end burner to stop burning at 200 ℃, starting burning at 150 ℃, stopping burning of the rear-side burner at 500 ℃, starting burning at 450 ℃, stopping burning at 550 ℃, and starting burning of the front-side burner at 500 ℃;
(2) After the furnace is started in the first stage and the temperature is raised for half an hour, controlling the right-end burner to stop burning at 300 ℃, starting burning at 250 ℃ and carrying out the furnace starting and heating operation in the second stage;
(3) After the furnace is started in the second stage and the temperature is raised for half an hour, controlling the right-end burner to stop burning at 400 ℃ and start burning at 350 ℃ so as to perform the furnace starting and heating operation in the third stage;
(4) After the furnace is started in the third stage and the temperature is raised for half an hour, controlling the right-end burner to stop burning at 470 ℃ and start burning at 420 ℃ to perform the furnace starting and heating operation in the fourth stage;
(5) After the furnace is started in the fourth stage and the temperature is raised for half an hour, the furnace starting and the temperature raising operation is completed, and the starting load of the main screw conveyor is controlled to be 15% of the total load.
The mercury removal device has the following advantages:
(1) According to the invention, each module is of a detachable modularized structure, so that the carrying and the moving are convenient, and in addition, the structure of stacking and mounting is realized, the hopper, the adsorption device and the heat exchanger are mounted on the supporting frame, and the combustion chamber and the material conveying device are mounted below the supporting frame, so that the occupied area is greatly reduced, the layout is reasonable, the modularized structure is relatively small, the carrying and the moving are convenient and quick, the workload in the transition is greatly reduced, and the labor cost is reduced;
(2) The main screw conveyor is adopted to convey the polluted soil, so that the polluted soil is convenient to control to stay in the combustion chamber section for a long time, organic matters and mercury can be fully separated from the soil, and the inclined screw conveyor is adopted to lift the treated soil to a certain height, so that the soil is convenient to collect and transport;
(3) The arrangement mode of the gas burner is that one gas burner is arranged at the feeding end of the combustion chamber, the other two gas burners are arranged on the front side surface and the rear side surface of the combustion chamber in a staggered way, and the turbulent flow of hot air formed in the combustion chamber can be ensured when the combustion chamber works so as to ensure the uniformity of heating in the length and width directions of the main screw conveyor in the combustion chamber;
(4) A heat dissipation plate is arranged above the flame of the gas burner and below the main screw conveyor, and when the gas burner works, hot air is blocked by the heat dissipation plate and then diffuses upwards so as to ensure that the space above the heat dissipation plate is heated uniformly;
(5) The combustion cavity with the strip flat frame-shaped structure is convenient for arranging the main screw conveyor, ensures the heating temperature length and the residence time of polluted soil, is more thorough in mercury removal treatment, and can ensure that the temperature outside the combustion chamber is not more than 60 ℃ by arranging the heat-insulating layer of ceramic fiber cotton, so that the energy consumption is effectively reduced;
(6) The upper side of the main spiral shell is provided with a plurality of strip-shaped ventilation through holes and a sealed air collecting cavity, so that mercury in polluted soil after high-temperature heating, water in the soil, volatile organic matters (if any) and a small part of soil dust can be conveniently collected, the collecting surface is large, and the collection is more sufficient;
(7) The driving motor is arranged at the outer end, so that the installation and the maintenance are convenient, and the space at the inner end of the inclined spiral conveyor is narrow and is close to the combustion chamber, so that the driving motor is not convenient to install;
(8) The liquid collecting box is arranged, so that collected mercury-containing liquid can be subjected to centralized treatment, and secondary pollution is avoided;
(9) The potassium iodide adsorption tank and the secondary activated carbon adsorption tank are adopted, so that the cooled mercury-containing gas can be further absorbed and filtered, and the gas discharged into the atmosphere meets the air quality requirement;
(10) The material conveying device adopting the fixed pulley is hung on the fixed pulley by adopting a lifting rope and a charging barrel connected with the lifting rope after being rotationally suspended, so that the conveying of polluted soil is facilitated.
The above description is only an example of the embodiment of the present invention, and the scope of the present invention is not limited thereto. Variations and alternatives can be readily ascertained by one skilled in the art within the scope of the present disclosure, which is intended to be within the scope of the present disclosure. For this purpose, the scope of the invention shall be subject to the scope of the claims.
Claims (1)
1. A mercury removal method of a modularized soil mercury removal device is characterized by comprising the following steps of: the modularized soil mercury removal device adopted by the method comprises a combustion chamber (1), a main screw conveyor (2), an inclined screw conveyor (3), a heat exchanger (4) and an adsorption device (5), wherein the main screw conveyor (2) penetrates through the combustion chamber (1) and is detachably and fixedly connected to the combustion chamber (1), the inlet end of the main screw conveyor (2) is connected to a hopper (7) through a feeding pipeline (6), the outlet end of the main screw conveyor extends out of the combustion chamber (1) and is detachably connected to the inclined screw conveyor (3), the hopper (7) is detachably connected to a supporting frame (8), the supporting frame (8) is detachably connected to the upper part of a container (9), the combustion chamber (1) is arranged in the container (9), the discharge end of the inclined screw conveyor (3) extends out of the container (9) and is detachably and fixedly connected with the container, the heat exchanger (4) is detachably connected to the supporting frame (8), the inlet of the heat exchanger (4) penetrates into the combustion chamber (1) through a pipeline and is connected to the main screw conveyor (2), the outlet of the heat exchanger (4) is detachably connected to the adsorption device (5) through the pipeline, and the adsorption device (5) is detachably connected to the supporting frame (8);
the main screw conveyor (2) comprises a main screw shell (201) and a main screw shaft (202) arranged in the main screw shell (201), wherein a plurality of strip-shaped ventilation through holes (203) are formed in the middle of the upper side of the main screw shell (201) along the length direction of the main screw shell (201), a sealed air collection cavity (204) is arranged outside the plurality of strip-shaped ventilation through holes (203), an exhaust pipe (205) is arranged above the air collection cavity (204), and the exhaust pipe (205) is communicated to the exhaust fan (502);
the right end of the main screw shaft (202) is connected to an output shaft of a first transmission (215) through a coupling, an input shaft of the first transmission (215) is connected to a variable-frequency driving motor (206) through belt transmission, the driving motor (206) is fixedly connected to a motor fixing frame (207), and the first transmission (215) is fixedly connected to the right end of the main screw shell (201);
the motor fixing frame (207) is fixedly connected in the container (9), the lower end of the motor fixing frame is provided with a position adjusting device, the position adjusting device comprises two symmetrical angle iron I (208) connected with the motor fixing frame (207) and two symmetrical angle iron II (209) fixedly connected to the container (9), the two symmetrical angle iron I (208) are oppositely downwards arranged to form a groove, the two symmetrical angle iron II (209) are oppositely upwards arranged to form a groove, the two symmetrical angle iron II (209) is embedded in the two symmetrical angle iron I (208), the two symmetrical angle iron I (208) is provided with a bolt (210), the two symmetrical angle iron II (209) corresponding to the bolt (210) is provided with a horizontal bar-shaped through hole (211), the bolt (210) is inserted into the horizontal bar-shaped through hole (211), the middle side of the bottom of the motor fixing frame (207) is provided with a rotatable adjusting screw (212), and the adjusting screw (212) is locked by adopting two nuts (214) after passing through the fixing plate (213), and the fixing plate (213) is fixedly connected to the container (9);
the combustion chamber (1) comprises a combustion cavity (101), a gas burner (102) and a chimney (103), wherein the top of the combustion cavity (101) is connected with the chimney (103), the gas burner (102) is detachably arranged at the right end, the front end and the rear end bottom of the combustion cavity (101) respectively, the right end gas burner (102) is right opposite to the center, and the front end and the rear end are inclined towards the left end of the combustion cavity (101) and are kept in staggered arrangement; a heat dissipation plate (104) positioned above the gas burner (102) is arranged in the combustion cavity (101), the heat dissipation plate (104) is hung on a hook (106) through a connecting rod (105), and the hook (106) is fixedly connected to the main screw conveyor (2); the combustion cavity (101) comprises a front plate group (107), a rear plate group (108), a left plate group (109), a right plate group (110), a top plate group (111) and a bottom plate group (112), wherein the front plate group (107), the rear plate group (108), the left plate group (109) and the right plate group (110) are fixedly connected into a long strip flat frame structure, the top plate group (111) and the bottom plate group (112) are fixedly connected to the upper end and the lower end of the frame structure, the front plate group (107), the rear plate group (108), the left plate group (109), the right plate group (110), the top plate group (111) and the bottom plate group (112) are hollow structures, and an insulating layer (113) made of ceramic fiber cotton is arranged inside the insulating layer;
the adsorption device (5) comprises two serially connected potassium iodide adsorption tanks (501), an exhaust fan (502) is arranged on an air outlet pipe of the next potassium iodide adsorption tank (501), the exhaust fan (502) is arranged in a container (9), an active carbon adsorption tank (503) is serially connected in front of the exhaust fan (502), the active carbon adsorption tank (503) is detachably connected in the container (9), the exhaust fan (502) is connected to an exhaust pipe (504), the exhaust pipe (504) extends into the atmosphere, a valve is arranged on an inlet pipe and an outlet pipe of each of the potassium iodide adsorption tanks (501) and the active carbon adsorption tank (503), a valve is also arranged on the short pipe, and each of the potassium iodide adsorption tanks (501) and the active carbon adsorption tank (503) is discharged into a wastewater tank through a drain pipe (17);
the specific method comprises the following steps: the polluted soil enters the right end of a main screw conveyor (2) through a hopper (7) and a charging gate valve arranged on a connecting pipe below the hopper, the polluted soil is conveyed to a section of the main screw conveyor (2) in a combustion chamber (1) in the conveying process of the main screw conveyor (2), the main screw conveyor (2) and the combustion chamber (1) form a high-temperature separation chamber, in the separation chamber, mercury and mercury compounds are vaporized at high temperature when the combustion chamber heats the soil to more than 360 ℃, mercury, moisture, volatile organic matters and a small part of soil dust contained in the soil are subjected to the combined action of cooling of a heat exchanger arranged above the separation chamber and extraction of an exhaust fan connected with an adsorption device, and finally the liquid is concentrated in a liquid collecting box below the heat exchanger, and is concentrated by a user after liquid is collected; the cooled gas is discharged into the atmosphere through an exhaust fan after being adsorbed together in a potassium iodide adsorption tank and an active carbon adsorption tank, organic matters and mercury are removed after thermal desorption, and the cooled gas enters an inclined screw conveyor (3) from the lower part of the tail part of the main screw conveyor (2) under the rotation pushing of the main screw conveyor (2) and is lifted and conveyed to an outer area of a container (9) to be discharged, and mercury-containing waste liquid in a liquid collecting box is conveyed to a sealing container through a pipeline after the polluted soil is treated by the system and then conveyed to a unit specially used for treating the waste liquid for harmless treatment; the furnace starting, temperature rising and combustion operation steps of the combustion chamber are as follows:
(1) The first stage of furnace starting and heating of the combustion chamber comprises the steps of starting and burning three gas burners, then controlling the right-end burner to stop burning at 200 ℃, starting burning at 150 ℃, stopping burning at 500 ℃ by the rear-side burner, starting burning at 450 ℃, stopping burning at 550 ℃, and starting burning at 500 ℃ by the front-side burner;
(2) After the furnace is started in the first stage and the temperature is raised for half an hour, controlling the right-end burner to stop burning at 300 ℃, starting burning at 250 ℃ and carrying out the furnace starting and heating operation in the second stage;
(3) After the furnace is started in the second stage and the temperature is raised for half an hour, controlling the right-end burner to stop burning at 400 ℃ and start burning at 350 ℃ so as to perform the furnace starting and heating operation in the third stage;
(4) After the furnace is started in the third stage and the temperature is raised for half an hour, controlling the right-end burner to stop burning at 470 ℃ and start burning at 420 ℃ to perform the furnace starting and heating operation in the fourth stage;
(5) After the furnace is started in the fourth stage and the temperature is raised for half an hour, the furnace starting and the temperature raising operation is completed, and the starting load of the main screw conveyor is controlled to be 15% of the total load.
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