CN103357654B - Integrated contaminated soil heat treatment system - Google Patents

Integrated contaminated soil heat treatment system Download PDF

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Publication number
CN103357654B
CN103357654B CN201310349547.8A CN201310349547A CN103357654B CN 103357654 B CN103357654 B CN 103357654B CN 201310349547 A CN201310349547 A CN 201310349547A CN 103357654 B CN103357654 B CN 103357654B
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gas
heat supply
pretreater
rotary kiln
outlet
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CN201310349547.8A
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CN103357654A (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 and add rotary kiln heating, exhaust gas oxidation decomposes and the contaminated soil heat treatment integrated system of tail gas clean-up.
Background technology
In contaminated site repair, Thermal desorption desorption technology is generally adopted for high-enriched organics contaminated soil, but this kind equipment is all contaminated soil is directly entered Equipment for Heating Processing to process at present, general pending contaminated soil moisture content is all higher, the process of heating soil, evaporate to dryness soil moisture first will be experienced when entering Equipment for Heating Processing, the effective time of staying of pending contaminated soil in kiln body is reduced, reduces the treatment effeciency of Equipment for Heating Processing; And high-temperature tail gas is also not used, heat energy is subject to significant wastage.
Summary of the invention
Technical problem to be solved by this invention is to provide 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, thus improves raising 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, heat supply ductwork is provided with in the middle part of pretreater, the two ends of heat supply ductwork are air inlet and exhaust outlet respectively, the volatilization gas discharge line that pretreater top is provided with gas skirt and is connected with gas skirt, rotary kiln is provided with hot-gas channel import and hot-gas channel outlet, hot-gas channel outlet is connected to the air inlet of pretreater heat supply ductwork, hot-gas channel import connects the volatilization gas discharge line of pretreater, pretreater heat supply ductwork exhaust outlet is connected to exhaust treatment system.
Contaminated soil is offloaded to pretreater inside by conveyer belt transport, the pipeline enclosure of heat supply ductwork is stored in contaminated soil, high-temperature gas is introduced from rotary kiln by pipeline, high-temperature gas flows and carries out preheating to the contaminated soil in pretreater in pretreater heat supply ductwork, cooled high-temperature gas is sent into rotary kiln from soil emergent gas through volatilization gas discharge line and is carried out high-temperature process, and the soil after preheating is transported to rotary kiln through conveyer belt and carries out high-temperature process further.
As the preferred technical scheme of one, described exhaust treatment system comprises redox room, cyclone dust collectors, quench tower, sack cleaner, ozone generator, spray absorber, redox pond, activated carbon adsorber and chimney;
Redox room connects the outlet of rotary kiln hot-gas channel and cyclone dust collectors air intake vent respectively, and cyclone dust collectors air outlet connects pretreater heat supply ductwork air inlet; The gas gone out by rotary kiln evaporation enters redox room, and cyclone dust collectors can remove the big dust particle carried in gas, and the tail gas after dedusting then introduces 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 successively with chimney, 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 wherein contained.Described spray absorber is used for evolving further gas, and spray-absorption top connects air compressor machine and utilizes high pressure to be atomized the Fenton reagent drawn from redox pond, and the reagent spray after atomization, on dusty gas, makes its further oxidation Decomposition.Then enter activated carbon adsorber physical absorption, send into chimney by air-introduced machine and discharge.
The output channel of ozone generator is connected to sack cleaner and rotary kiln respectively.Gas after sack cleaner dedusting adds ozone by ozone generator, the dusty gas preliminary oxidation in tail gas is decomposed, then enters spray absorber.Be provided with air blast at rotary kiln and add ozone in rotary kiln, accelerate the oxidation Decomposition of dusty gas.
As the preferred technical scheme of another kind, described pretreater, tower top is provided with gas skirt and the mouth that buries, feed bin is provided with at the bottom of tower, described heat supply ductwork by vertical characteristics and head and the tail connect three layers of heat supply pipeline form, every one deck heat supply pipeline all comprises a snake pipe, two ports of this snake pipe are air inlet and exhaust outlet respectively, 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, feed bin is built with the conveyer belt pretreated soil being sent into Equipment for Heating Processing.The high-temperature gas that Equipment for Heating Processing rotary kiln produces is entered through the air inlet of bottom snake pipe by the hot-gas channel entrance on pretreater, and pipeline enclosure is used for depositing contaminated soil, conducts the heat heat contaminated soil by tube wall.In tower by three layers of snake pipe around, from bottom to top through three layers of heat supply pipeline, progressively exported by the hot-gas channel on top after material in heating tower and discharge.
Pretreatment system is with the addition of in contaminated soil heat treatment integrated system of the present invention, the high-temperature gas utilizing rotary kiln to produce is to contaminated soil pretreatment, dry soil after preheating enters Equipment for Heating Processing rotary kiln again and heats further, extend the effective time of staying of soil in kiln body, significantly reduce energy consumption, effectively raising treatment effeciency, adopts hierarchical design in pretreater, has maximally utilised the high-temperature tail gas of rotary kiln.The present invention is applicable to the process of contaminated soil in various degree, can be widely used in the repairing and treating work in organic contamination place.
Accompanying drawing explanation
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.
100-pretreatment system, 101-air inlet, 102-exhaust outlet, 103-volatilization gas discharge line, 104-feed bin, 105-snake pipe, 106-conveyer belt, 107-turnover panel, 108-column, 109-cross bar, the 110-arm of force, 111-clamping bar, 112-steel wire rope, 113-pulley, 114-hoist engine, 115-rotating plate shaft, 116-combs sieve, 117-roller screen, 118-Gravel Pit, 119-combs sieve hole, and 120-roller screen is cheated, and 121-buries mouth;
200-rotary kiln,
301-redox room, 302-cyclone dust collectors, 303-quench tower, 304-sack cleaner, 305-spray absorber, 306-redox pond, 307-activated carbon adsorber, 308-chimney.
Detailed description of the invention
Below in conjunction with accompanying drawing, the technical scheme that application claims is protected 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, heat supply ductwork is provided with in the middle part of pretreater, the two ends of heat supply ductwork are air inlet 101 and exhaust outlet 102 respectively, the volatilization gas discharge line 103 that pretreater top is provided with gas skirt and is connected with gas skirt, rotary kiln 200 is provided with hot-gas channel import and hot-gas channel outlet, hot-gas channel outlet is connected to the air inlet 101 of pretreater heat supply ductwork, hot-gas channel import connects the volatilization gas discharge line 103 of pretreater, 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 control of combustor fuel feeding size realization to in-furnace temperature according to soil contamination grade.
Described exhaust treatment system comprises redox room 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 room 301 connects the outlet of rotary kiln hot-gas channel and cyclone dust collectors 302 air intake vent respectively, and cyclone dust collectors 302 air outlet connects pretreater heat supply ductwork air inlet 101; The gas volatilized by rotary kiln 200 enters redox room 301, and described redox room 301 is high heating element, and front end is provided with combustor can make indoor temperature reach 1200 DEG C, can effectively decompose high density pollution gas.Redox room 301 is not generally opened, and only have when pollutant levels are too high, compound is difficult to decompose, when follow-up exhaust treatment system scarce capacity is to process, or in soil during chloride higher easy generation bioxin, this unit is opened by side.Described cyclone dust collectors 302 can remove the big dust particle carried in gas, and the tail gas after dedusting then introduces soil pretreatment tower by air-introduced machine, realizes the recycling of tail gas.
Quench tower 303, sack cleaner 304, spray absorber 305, redox pond 306, activated carbon adsorber 307 are connected successively with chimney 308, and the arrival end of quench tower 303 connects pretreater heat supply ductwork exhaust outlet 102; Utilize quench tower that the high-temperature gas of 1200 DEG C can be made to be cooled to 200 ~ 300 DEG C rapidly, 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 wherein contained.Described spray absorber 305 is used for evolving further gas, and spray absorber 305 top connects air compressor machine and utilizes high pressure to be atomized the Fenton reagent drawn from redox pond 306, and the reagent spray after atomization, on dusty gas, makes its further oxidation Decomposition.Then enter activated carbon adsorber 307 physical absorption, send into chimney by air-introduced machine and discharge.
The output channel of ozone generator is connected to sack cleaner 304 and rotary kiln 200 respectively.Gas after sack cleaner 304 dedusting adds ozone by ozone generator, the dusty gas preliminary oxidation in tail gas is decomposed, then enters spray absorber 305.Be provided with air blast at rotary kiln 200 kiln tail and add ozone in rotary kiln 200, accelerate the oxidation Decomposition of dusty gas.
As Fig. 2, shown in 3, described pretreater, feed bin 104 is provided with at the bottom of tower, described heat supply ductwork by vertical characteristics and head and the tail connect three layers of heat supply pipeline form, every one deck heat supply pipeline all comprises a snake pipe 105, two ports of this snake pipe 105 are air inlet and exhaust outlet respectively, 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, feed bin 104 is built with the conveyer belt 106 pretreated soil being sent into Equipment for Heating Processing.
Material by Belt Conveying to tower top, by burying, mouth 121 enters top layer heat supply pipeline, next layer is entered after heating certain hour, new material enters top layer again, so successively declining, to enter tower bed material storehouse after completing preheating temporary simultaneously, then by feed bin 104 bottom conveyor, mass transport is entered into rotary kiln 200.The high-temperature gas that rotary kiln 200 produces enters from bottom snake pipe, from bottom to top through three layers of heat supply pipeline, is progressively discharged by top layer after material in heating tower.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 tower, and turnover panel 17 can form confined space and fall to prevent the downward one deck of soil, and when soil heating is complete, turnover panel 107 rotates and soil fallen in lower floor's tower by upper strata continue heating or enter feed bin 104; The operation of all parts realizes controlling by integrating control cabinet.
As shown in Figure 3, on the basis of said structure, every layer of plate turnover system is made up of several turnover panels 107 and is connected with 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, rotating plate shaft 115 is fixed in the middle part of turnover panel 107, the bracing frame that cross bar 109 and column 108 are connected to form is fixed on the both sides of turnover panel 107, the two ends loading of rotating plate shaft 115 is opened in the axis hole inside cross bar 109, the vertical end being fixed on 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 with on the clamping bar 111 that be arranged in parallel with cross bar 109, clamping bar 111 is connected to hoist engine 114 by steel wire rope 112 and pulley 113.Rotated the stroke controlling clamping bar 111 by hoist engine 114, thus control the upset of turnover panel 107.After the heat having made full use of top layer, control to enter the second layer in tower by hoist engine 114 continue heating, after the heat having made full use of the second layer, control to enter in tower bottom by hoist engine 114 continue heating, finally control turnover panel 107 by hoist engine 114 and make soil slowly fall into conveyer belt to be transported to rotary kiln.
As shown in Figure 2, the present invention also comprises the screening and movement system of soil being sent into pretreater, this system comprises comb sieve 116, roller screen 117 and Gravel Pit 118, sieve hole 119 of combing is provided with below comb sieve 116, comb between sieve hole 119 and roller screen 117 and set up conveyer belt 106, be provided with roller screen hole 120 below roller screen 117, comb sieve 116, between roller screen 117 and Gravel Pit 118, set up conveyer belt 106.Loading machine is utilized contaminated soil to be poured onto castor sieve 116, the ratchel landing of being sieved out by comb sieve 116 is to Gravel Pit 118, soil after preliminary screening falls into sieve hole 119 of combing, roller screen 117 is transported to again by conveyer belt, described roller screen 117 is controlled by variable-frequency motor connection reducer, drum rotation speed controls by regulating electric machine frequency, and rolled by roller screen 117 and the shock of stone and soil makes soil sieve further, the stone after screening is transported to Gravel Pit 118 by conveyer belt.The contaminated soil sieved out falls into roller screen hole 120 and is transported to pretreater by conveyer belt, and soil is transported to Equipment for Heating Processing by conveyer belt after heating in pretreater.
The high-temperature tail gas that the present invention utilizes rotary kiln device to give off, makes it enter soil pretreatment tower, is heated the soil in tower by the flowing of tail gas in pretreater.Soil after heating enters rotary kiln 200 again and processes.The tail gas that pretreater gives off then introduces spray absorber 305, before entering spray absorber 305, the ozone that ozone generator produces is added in tail gas, dusty gas preliminary oxidation in tail gas is decomposed, after entering spray absorber 305, utilize the Fenton reagent after atomization to carry out further oxidation Decomposition to tail gas, the atomization gas in spray absorber 305 is draw the Fenton reagent in automatic oxidation reduction 306 pond, is atomized reagent by air compressor machine.Tail gas after process introduces activated carbon adsorber 307, then carries out physical absorption.Meanwhile, all parts of whole system are all connected into Automated condtrol room by holding wire, are realized the automatic operating of system by the operation interface on computer.

Claims (1)

1. a 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, heat supply ductwork is provided with in the middle part of pretreater, the two ends of heat supply ductwork are air inlet (101) and exhaust outlet (102) respectively, the volatilization gas discharge line (103) that pretreater top is provided with gas skirt and is connected with gas skirt, rotary kiln (200) is provided with hot-gas channel import and hot-gas channel outlet, hot-gas channel outlet is connected to the air inlet (101) of pretreater heat supply ductwork, hot-gas channel import connects the volatilization gas discharge line (103) of pretreater, pretreater heat supply ductwork exhaust outlet (102) is connected to exhaust treatment system,
Described exhaust treatment system comprises redox room (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 room (301) connects the outlet of rotary kiln hot-gas channel and cyclone dust collectors (302) air intake vent respectively, 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 successively with chimney (308), and the arrival end of quench tower (303) connects pretreater heat supply ductwork exhaust outlet (102);
The output channel of ozone generator is connected to sack cleaner (304) and rotary kiln (200) respectively;
Described pretreater, feed bin (104) is provided with at the bottom of tower, described heat supply ductwork by vertical characteristics and head and the tail connect three layers of heat supply pipeline form, every one deck heat supply pipeline all comprises a snake pipe (105), two ports of this snake pipe (105) are air inlet and exhaust outlet respectively, 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), feed bin (104) is built with the conveyer belt (106) pretreated soil being sent into Equipment for Heating Processing,
Every layer of plate turnover system is made up of several turnover panels (107) and is connected with 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), the fixing rotating plate shaft (115) in turnover panel (107) middle part, the bracing frame that cross bar (109) and column (108) are connected to form is fixed on the both sides of turnover panel, the two ends loading of rotating plate shaft (115) is opened in the axis hole of cross bar (109) inner side, the vertical end being fixed on 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 with on the clamping bar (111) that be arranged in parallel with cross bar (109), clamping bar (111) is connected to hoist engine (114) by steel wire rope (112) and pulley (113),
Also comprise the screening and movement system of soil being sent into pretreater, this system comprises comb sieve (116), roller screen (117) and Gravel Pit (118), comb to sieve below (116) and be provided with sieve hole (119) of combing, comb between sieve hole (119) and roller screen (117) and set up conveyer belt (106), roller screen (117) below is provided with roller screen hole (120), combs and sieves (116), sets up conveyer belt (106) between roller screen (117) and Gravel Pit (118).
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CN104607454B (en) * 2015-01-23 2018-04-06 苏州同和环保工程有限公司 The heat treatment restorative procedure and system of a kind of 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
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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CN2364036Y (en) * 1998-09-28 2000-02-16 北京农乐肥料有限责任公司 Organic biofertilizer fermentation device
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