CN103357654A - Integrated contaminated soil heat treatment system - Google Patents

Integrated contaminated soil heat treatment system Download PDF

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Publication number
CN103357654A
CN103357654A CN2013103495478A CN201310349547A CN103357654A CN 103357654 A CN103357654 A CN 103357654A CN 2013103495478 A CN2013103495478 A CN 2013103495478A CN 201310349547 A CN201310349547 A CN 201310349547A CN 103357654 A CN103357654 A CN 103357654A
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China
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gas
heat supply
pretreater
rotary kiln
contaminated soil
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CN2013103495478A
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CN103357654B (en
Inventor
刘利军
党晋华
张国信
史晓凯
向云
张丽
赵颖
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SHANXI ACADEMY OF ENVIRONMENTAL RESEARCH
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SHANXI ACADEMY OF ENVIRONMENTAL RESEARCH
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Abstract

The invention discloses an integrated contaminated soil heat treatment system. The integrated contaminated soil heat treatment system comprises a pretreatment system, a rotary kiln and a tail gas treatment system, wherein the pretreatment system comprises a pretreatment tower; a heat supply pipeline system is arranged in the middle of the pretreatment tower; a gas inlet and a gas outlet are formed in two ends of the heat supply pipeline system respectively; a gas-collecting hood and a volatile gas exhaust pipeline are arranged on the top of the pretreatment tower; the volatile gas exhaust pipeline is connected with the gas-collecting hood; a high-temperature gas pipeline inlet and a high-temperature gas pipeline outlet are formed in the rotary kiln; the high-temperature gas pipeline outlet is connected to the gas inlet of the heat supply pipeline system of the pretreatment tower; the high-temperature gas pipeline inlet is connected to the volatile gas exhaust pipeline of the pretreatment tower; the gas outlet of the heat supply pipeline system of the pretreatment tower is connected to the tail gas treatment system. Contaminated soil is pretreated through high-temperature gas generated by the rotary kiln, so that the energy consumption is greatly reduced, and the treatment efficiency is effectively improved; the interior of the pretreatment tower adopts layered design, so that the high-temperature tail gas of the rotary kiln is utilized to the greatest extent.

Description

Contaminated soil heat treatment integrated system
Technical field
The present invention relates to industrial pollution site remediation equipment, particularly comprise the contaminated soil heat treatment integrated system that adds rotary kiln heating, tail gas oxidation Decomposition and tail gas clean-up.
Background technology
In the contaminated site repair, generally adopt pyrolysis to analyse desorption technology for the high-enriched organics contaminated soil, but this kind equipment all is contaminated soil directly to be entered Equipment for Heating Processing process at present, general pending contaminated soil moisture content is all higher, when entering Equipment for Heating Processing, to experience first the process of heating soil, evaporate to dryness soil moisture, so that the effective time of staying of pending contaminated soil in the kiln body reduces, reduced the treatment effeciency of Equipment for Heating Processing; And high-temperature tail gas also is not used, and heat energy is subject to significant wastage.
Summary of the invention
Technical problem to be solved by this invention provides a kind of contaminated soil heat treatment integrated system, and the high-temperature gas that this system can utilize rotary kiln to produce carries out preheating to pending soil, thereby has improved treatment effeciency, reduces energy consumption.
In order to solve above technical problem, the technical solution used in the present invention is:
A kind of contaminated soil heat treatment integrated system, comprise pretreatment system, rotary kiln and exhaust treatment system, described pretreatment system comprises pretreater, the pretreater middle part is provided with heat supply ductwork, the two ends of heat supply ductwork are respectively air inlet and exhaust outlet, the volatilization gas discharge line that the pretreater top is provided with gas skirt and links to each other with gas skirt, rotary kiln is provided with hot-gas channel import and hot-gas channel outlet, the hot-gas channel outlet is connected to the air inlet of pretreater heat supply ductwork, the hot-gas channel import connects the volatilization gas discharge line of pretreater, and pretreater heat supply ductwork exhaust outlet is connected to exhaust treatment system.
Contaminated soil is offloaded to pretreater inside by the conveyer belt transportation, the pipeline enclosure of heat supply ductwork deposits contaminated soil in, introduce high-temperature gas by pipeline from rotary kiln, high-temperature gas flows in the pretreater heat supply ductwork contaminated soil in the pretreater is carried out preheating, cooled high-temperature gas is sent into rotary kiln from the soil emergent gas through the volatilization gas discharge line and is carried out high-temperature process, and the soil after the preheating is transported to rotary kiln through conveyer belt and further carries out high-temperature process.
As a kind of preferred technical scheme, described exhaust treatment system comprises redox chamber, cyclone dust collectors, quench tower, sack cleaner, ozone generator, spray absorber, redox pond, activated carbon adsorber and chimney;
The redox chamber connects respectively the outlet of rotary kiln hot-gas channel and cyclone dust collectors air intake vent, and the cyclone dust collectors air outlet connects pretreater heat supply ductwork air inlet; The gas that is gone out by rotary kiln evaporation enters the redox chamber, and cyclone dust collectors can be removed the big dust particle that carries in the gas, and the tail gas after the dedusting is then introduced the soil pretreatment tower by air-introduced machine, realizes the recycling of tail gas.
Quench tower, sack cleaner, spray absorber, redox pond, activated carbon adsorber are connected with chimney and are connected, and the arrival end of quench tower connects pretreater heat supply ductwork exhaust outlet; The tail gas that quench tower is discharged is admitted to sack cleaner, removes the granule dust that wherein contains.Described spray absorber is used for further evolving gas, and the spray-absorption top connects air compressor machine and utilizes high pressure that the Fenton reagent of drawing from the redox pond is atomized, and the reagent spray after the atomizing makes its further oxidation Decomposition on dusty gas.Then enter the activated carbon adsorber physical absorption, send into chimney by air-introduced machine and discharge.
The output channel of ozone generator is connected to respectively sack cleaner and rotary kiln.Gas after the sack cleaner dedusting adds ozone by ozone generator, makes the preliminary oxidation Decomposition of dusty gas in the tail gas, then enters spray absorber.Be provided with air blast at rotary kiln and in rotary kiln, add ozone, accelerate the oxidation Decomposition of dusty gas.
As the preferred technical scheme of another kind, described pretreater, cat head is provided with gas skirt and the mouth that buries, be provided with feed bin at the bottom of the tower, described heat supply ductwork is comprised of three layers of heat supply pipeline that vertical distribution and head and the tail connect, every one deck heat supply pipeline all comprises a snake pipe, two ports of this snake pipe are respectively air inlet and exhaust outlet, separated by plate turnover system between each layer heat supply ductwork, the air inlet of bottom snake pipe connects the hot-gas channel outlet of rotary kiln, the exhaust outlet of top layer snake pipe connects the arrival end of quench tower, and the conveyer belt of pretreated soil being sent into Equipment for Heating Processing is housed in the feed bin.The high-temperature gas that the Equipment for Heating Processing rotary kiln produces is entered through the air inlet of bottom snake pipe by the hot-gas channel entrance on the pretreater, and pipeline enclosure is used for depositing contaminated soil, conducts the heat that by tube wall contaminated soil is heated.In tower by three layers of snake pipe around, from bottom to top through three layers of heat supply pipeline,, progressively discharged by the hot-gas channel outlet on top behind the material in the heating tower.
Added pretreatment system in the contaminated soil heat treatment integrated system of the present invention, utilize the high-temperature gas of rotary kiln generation to the contaminated soil preliminary treatment, dry soil after preheating enters the further heat treated of Equipment for Heating Processing rotary kiln again, prolonged the effective time of staying of soil in the kiln body, greatly reduced energy consumption, effectively the raising treatment effeciency, adopt hierarchical design in the pretreater, maximally utilised the high-temperature tail gas of rotary kiln.The present invention is applicable to the in various degree processing of contaminated soil, can be widely used in the repairing and treating work in organic contamination place.
Description of drawings
Fig. 1 is the structural representation of contaminated soil heat treatment integrated system of the present invention.
Fig. 2 is the structural representation of pretreater.
Fig. 3 is the structural representation of heat supply ductwork and turnover panel control system.
The 100-pretreatment system, 101-air inlet, 102-exhaust outlet, 103-volatilization gas discharge line, the 104-feed bin, 105-snake pipe, 106-conveyer belt, 107-turnover panel, the 108-column, 109-cross bar, the 110-arm of force, 111-clamping bar, the 112-steel wire rope, 113-pulley, 114-hoist engine, 115-rotating plate shaft, the 116-sieve of combing, 117-roller screen, 118-Gravel Pit, the 119-sieve hole of combing, 120-roller screen hole, the 121-mouth that buries;
The 200-rotary kiln,
301-redox chamber, 302-cyclone dust collectors, 303-quench tower, 304-sack cleaner, 305-spray absorber, 306-redox pond, 307-activated carbon adsorber, 308-chimney.
The specific embodiment
Below in conjunction with accompanying drawing the claimed technical scheme of the present invention is described in further detail.
As shown in Figure 1, a kind of contaminated soil heat treatment integrated system of the present invention, comprise pretreatment system 100, rotary kiln 200 and exhaust treatment system, described pretreatment system comprises pretreater, the pretreater middle part is provided with heat supply ductwork, the two ends of heat supply ductwork are respectively air inlet 101 and exhaust outlet 102, the volatilization gas discharge line 103 that the pretreater top is provided with gas skirt and links to each other with gas skirt, rotary kiln 200 is provided with hot-gas channel import and hot-gas channel outlet, the hot-gas channel outlet is connected to the air inlet 101 of pretreater heat supply ductwork, the hot-gas channel import connects the volatilization gas discharge line 103 of pretreater, and pretreater heat supply ductwork exhaust outlet 102 is connected to exhaust treatment system.Contaminated soil enters rotary kiln 200 through feed auger, and pollutant volatilizees under furnace high-temperature, automatically regulates the realization of combustor fuel feeding size to the control of temperature in the stove according to soil contamination grade.
Described exhaust treatment system comprises redox chamber 301, cyclone dust collectors 302, quench tower 303, sack cleaner 304, ozone generator, spray absorber 305, redox pond 306, activated carbon adsorber 307 and chimney 308; Redox chamber 301 connects respectively the outlet of rotary kiln hot-gas channel and cyclone dust collectors 302 air intake vents, and cyclone dust collectors 302 air outlets connect pretreater heat supply ductwork air inlet 101; The gas that is volatilized by rotary kiln 200 enters redox chamber 301, and described redox chamber 301 is the high-temperature heating unit, and front end is provided with combustor can make indoor temperature reach 1200 ℃, can effectively decompose high density pollution gas.Generally does not open redox chamber 301, only has, compound too high when pollutant levels to be difficult to decompose, and follow-up exhaust treatment system scarce capacity is when processing, or in the soil during chloride higher easy generation bioxin, this unit is opened by the side.Described cyclone dust collectors 302 can be removed the big dust particle that carries in the gas, and the tail gas after the dedusting is then introduced the soil pretreatment tower by air-introduced machine, realize the recycling of tail gas.
Quench tower 303, sack cleaner 304, spray absorber 305, redox pond 306, activated carbon adsorber 307 are connected with chimney successively and are connected, and the arrival end of quench tower 303 connects pretreater heat supply ductwork exhaust outlet 102; Utilize quench tower can make 1200 ℃ high-temperature gas be cooled to rapidly 200~300 ℃, to prevent the generation of bioxin.The tail gas that quench tower 303 is discharged is admitted to sack cleaner 304, removes the granule dust that wherein contains.Described spray absorber 305 is used for further evolving gas, and spray absorber 305 tops connect air compressor machine and utilize high pressure to 306 Fenton reagents of drawing atomize from the redox pond, and the reagent spray after the atomizing makes its further oxidation Decomposition on dusty gas.Then enter activated carbon adsorber 307 physical absorptions, send into chimney by air-introduced machine and discharge.
The output channel of ozone generator is connected to respectively sack cleaner 304 and rotary kiln 200.Gas after sack cleaner 304 dedustings adds ozone by ozone generator, makes the preliminary oxidation Decomposition of dusty gas in the tail gas, then enters spray absorber 305.Be provided with air blast to rotary kiln 200 interior adding ozone at rotary kiln 200 kiln tails, accelerate the oxidation Decomposition of dusty gas.
Such as Fig. 2, shown in 3, described pretreater, be provided with feed bin 104 at the bottom of the tower, described heat supply ductwork is comprised of three layers of heat supply pipeline that vertical distribution and head and the tail connect, every one deck heat supply pipeline all comprises a snake pipe 105, two ports of this snake pipe 105 are respectively air inlet and exhaust outlet, separated by plate turnover system between each layer heat supply ductwork, the air inlet of bottom snake pipe 105 connects the hot-gas channel outlet of rotary kiln 200, the exhaust outlet of top layer snake pipe 105 connects the arrival end of quench tower 303, and the conveyer belt 106 of pretreated soil being sent into Equipment for Heating Processing is housed in the feed bin 104.
Material arrives cat head by Belt Conveying, mouth 121 enters the top layer heat supply pipeline by burying, enter next layer behind the heating certain hour, new material enters top layer again, so successively descend and finish simultaneously that to enter tower bed material storehouse after the preheating temporary, by feed bin 104 bottom conveyors mass transport is entered into rotary kiln 200 again.The high-temperature gas that rotary kiln 200 produces enters from the bottom snake pipe, from bottom to top through three layers of heat supply pipeline, is progressively discharged by top layer behind the material in the heating tower.The soil emergent gas upwards enters gas skirt through the interlayer of tower wall, sends into rotary kiln 200 high-temperature process by the air-introduced machine sucking-off of external linkage after condensation.The below of every one deck is provided with several turnover panels 107 in the tower, and turnover panel 17 can form confined space and fall to prevent the downward one deck of soil, rotates and soil is fallen into by the upper strata continue heating in lower floor's tower or enter feed bin 104 when soil heats when complete turnover panel 107; The operation of all parts realizes control by integrated switch board.
As shown in Figure 3, on the basis of said structure, every layer of plate turnover system is comprised of several turnover panels 107 and is connected with the turnover panel control system, this turnover panel control system comprises column 108, cross bar 109, the arm of force 110, clamping bar 111, steel wire rope 112, pulley 113 and hoist engine 114, turnover panel 107 middle parts are rotating plate shaft 115 fixedly, the bracing frame that cross bar 109 and column 108 are connected to form is fixed in the both sides of turnover panel 107, pack into and be opened in the axis hole of cross bar 109 inboards in the two ends of rotating plate shaft 115, the vertical end of being fixed in rotating plate shaft 115, bottom of the arm of force 110 corresponding with turnover panel 107 quantity, the top of the arm of force 110 is articulated on the clamping bar 111 that be arranged in parallel with cross bar 109, and clamping bar 111 is connected in hoist engine 114 by steel wire rope 112 and pulley 113.Rotate the stroke of control clamping bar 111 by hoist engine 114, thereby control the upset of turnover panel 107.After having taken full advantage of the heat of top layer, enter second layer continuation heating in the tower by hoist engine 114 controls, after having taken full advantage of the heat of the second layer, enter bottom continuation heating in the tower by hoist engine 114 controls, make soil slowly fall into conveyer belt by hoist engine 114 control turnover panels 107 at last and be transported to rotary kiln.
As shown in Figure 2, the present invention also comprises screening and the movement system of soil being sent into pretreater, this system comprises comb sieve 116, roller screen 117 and Gravel Pit 118, comb sieve 116 belows are provided with the sieve hole 119 of combing, comb and set up conveyer belt 106 between sieve hole 119 and the roller screen 117, roller screen 117 belows are provided with roller screen hole 120, comb and have set up conveyer belt 106 between sieve 116, roller screen 117 and the Gravel Pit 118.Utilize loading machine that contaminated soil is poured onto castor sieve 116, sieve the 116 ratchel landings of sieving out to Gravel Pit 118 by combing, soil after the preliminary screening falls into the sieve hole 119 of combing, be transported to roller screen 117 by conveyer belt again, described roller screen 117 is by the control of variable-frequency motor connection reducer, drum rotation speed can pass through the regulating electric machine FREQUENCY CONTROL, and the bump by roller screen 117 rollings and stone and soil further sieves soil, and the stone after the screening is transported to Gravel Pit 118 by conveyer belt.The contaminated soil that sieves out falls into roller screen hole 120 and is transported to pretreater by conveyer belt, and soil heat in pretreater afterwards and is transported to Equipment for Heating Processing by conveyer belt.
The high-temperature tail gas that the present invention utilizes rotary kiln device to give off makes it enter the soil pretreatment tower, by tail gas flowing in pretreater the soil in the tower is heated.Soil after the heating enters rotary kiln 200 again and processes.The tail gas that pretreater gives off is then introduced spray absorber 305, before entering spray absorber 305, in tail gas, add the ozone that ozone generator produces, make the preliminary oxidation Decomposition of dusty gas in the tail gas, after entering spray absorber 305, utilize the Fenton reagent after atomizing that tail gas is carried out further oxidation Decomposition, the atomization gas in the spray absorber 305 is the Fenton reagent that draws in automatic oxidation reduction 306 ponds, by air compressor machine reagent is atomized.Tail gas after the processing is introduced activated carbon adsorber 307, carries out physical absorption again.Simultaneously, all parts of whole system all are connected into the automation control room by holding wire, realize the automatic operating of system by the operation interface on the computer.

Claims (5)

1. contaminated soil heat treatment integrated system, comprise pretreatment system (100), rotary kiln (200) and exhaust treatment system, it is characterized in that: described pretreatment system comprises pretreater, the pretreater middle part is provided with heat supply ductwork, the two ends of heat supply ductwork are respectively air inlet (101) and exhaust outlet (102), the volatilization gas discharge line (103) that the pretreater top is provided with gas skirt and links to each other with gas skirt, rotary kiln (200) is provided with hot-gas channel import and hot-gas channel outlet, the hot-gas channel outlet is connected to the air inlet (101) of pretreater heat supply ductwork, the hot-gas channel import connects the volatilization gas discharge line (103) of pretreater, and pretreater heat supply ductwork exhaust outlet (102) is connected to exhaust treatment system.
2. contaminated soil heat treatment integrated system according to claim 1, it is characterized in that: described exhaust treatment system comprises redox chamber (301), cyclone dust collectors (302), quench tower (303), sack cleaner (304), ozone generator, spray absorber (305), redox pond (306), activated carbon adsorber (307) and chimney (308); Redox chamber (301) connects respectively the outlet of rotary kiln hot-gas channel and cyclone dust collectors (302) air intake vent, and cyclone dust collectors (302) air outlet connects pretreater heat supply ductwork air inlet (101);
Quench tower (303), sack cleaner (304), spray absorber (305), redox pond (306), activated carbon adsorber (307) are connected 308 with chimney) connect successively, the arrival end of quench tower (303) connects pretreater heat supply ductwork exhaust outlet (102);
The output channel of ozone generator is connected to respectively sack cleaner (304) and rotary kiln (200).
3. contaminated soil heat treatment integrated system according to claim 2, it is characterized in that: described pretreater, be provided with feed bin (104) at the bottom of the tower, described heat supply ductwork is comprised of three layers of heat supply pipeline that vertical distribution and head and the tail connect, every one deck heat supply pipeline all comprises a snake pipe (105), two ports of this snake pipe (105) are respectively air inlet and exhaust outlet, separated by plate turnover system between each layer heat supply ductwork, the air inlet of bottom snake pipe (105) connects the hot-gas channel outlet of rotary kiln (200), the exhaust outlet of top layer snake pipe (105) connects the arrival end of quench tower (303), and the conveyer belt (106) of pretreated soil being sent into Equipment for Heating Processing is housed in the feed bin (104).
4. contaminated soil pre-processing device according to claim 3, it is characterized in that: every layer of plate turnover system is comprised of several turnover panels (107) and is connected with the turnover panel control system, this turnover panel control system comprises column (108), cross bar (109), the arm of force (110), clamping bar (111), steel wire rope (112), pulley (113) and hoist engine (114), turnover panel (107) middle part is rotating plate shaft (115) fixedly, the bracing frame that cross bar (109) and column (108) are connected to form is fixed in the both sides of turnover panel, pack into and be opened in the inboard axis hole of cross bar (109) in the two ends of rotating plate shaft (115), the vertical end of being fixed in rotating plate shaft (115), bottom of the arm of force (110) corresponding with turnover panel (107) quantity, the top of the arm of force (110) is articulated on the clamping bar (111) that be arranged in parallel with cross bar (109), and clamping bar (111) is connected in hoist engine (114) by steel wire rope (112) and pulley (113).
5. contaminated soil pretreatment system according to claim 2, it is characterized in that: also comprise screening and the movement system of soil being sent into pretreater, this system comprises comb sieve (116), roller screen (117) and Gravel Pit (118), comb sieve (116) below is provided with the sieve of combing and cheats (119), comb and set up conveyer belt (106) between sieve hole (119) and the roller screen (117), roller screen (117) below is provided with roller screen hole (120), combs and has set up conveyer belt (106) between sieve (116), roller screen (117) and the Gravel Pit (118).
CN201310349547.8A 2013-08-13 2013-08-13 Integrated contaminated soil heat treatment system Active CN103357654B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104607454A (en) * 2015-01-23 2015-05-13 苏州同和环保工程有限公司 Thermal treatment restoration method and system for contaminated soil
CN105363770A (en) * 2015-12-17 2016-03-02 上海康恒环境股份有限公司 Sectional type heating and modular thermal desorption equipment for restoring organic contaminated soil and method
CN105834204A (en) * 2016-05-12 2016-08-10 贵州省环境科学研究设计院 Soil mercury removing system
CN110201990A (en) * 2019-06-11 2019-09-06 江苏博世建设有限公司 Contaminated soil remediation system adopting recirculating

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CN102580994A (en) * 2012-02-27 2012-07-18 山西省环境科学研究院 Remediation equipment for non-volatile organic polluted soil
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Publication number Priority date Publication date Assignee Title
CN104607454A (en) * 2015-01-23 2015-05-13 苏州同和环保工程有限公司 Thermal treatment restoration method and system for contaminated soil
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CN105363770A (en) * 2015-12-17 2016-03-02 上海康恒环境股份有限公司 Sectional type heating and modular thermal desorption equipment for restoring organic contaminated soil and method
CN105834204A (en) * 2016-05-12 2016-08-10 贵州省环境科学研究设计院 Soil mercury removing system
CN110201990A (en) * 2019-06-11 2019-09-06 江苏博世建设有限公司 Contaminated soil remediation system adopting recirculating
CN110201990B (en) * 2019-06-11 2021-12-17 江苏博世建设有限公司 Contaminated soil remediation system

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