CN101972773B - System for restoring organic contaminated soil by forced ventilation and spiral stirring thermal desorption - Google Patents
System for restoring organic contaminated soil by forced ventilation and spiral stirring thermal desorption Download PDFInfo
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- CN101972773B CN101972773B CN2010105554000A CN201010555400A CN101972773B CN 101972773 B CN101972773 B CN 101972773B CN 2010105554000 A CN2010105554000 A CN 2010105554000A CN 201010555400 A CN201010555400 A CN 201010555400A CN 101972773 B CN101972773 B CN 101972773B
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Abstract
The invention provides a system for restoring organic contaminated soil by forced ventilation and spiral stirring thermal desorption, which comprises an air preheating system, a spiral stirring thermal desorption system, a tail gas treatment system and a control system, wherein the air preheating system consists of a blower and an air heater, the spiral stirring thermal desorption system consists of a spiral stirring thermal desorption device and a draft fan, the tail gas treatment system consists of a cyclone dust collector, a dehumidifier and an absorption tower, and the control system can realize the effective control of the rotation speed of a spiral stirrer, the air preheating temperature and the soil heating temperature. The system can be used for restoring soil contaminated by volatile/semi-volatile organic matters.
Description
Technical field
[0001] the present invention relates to the system that a kind of reparation receives volatility/half volatile organic contaminant contaminated soil, say so more specifically through adopting the system of forced ventilation-helical stir thermal desorption renovation of organic pollution soil that forced ventilation and electrical heating repair organic polluted soil.
Background technology
In recent years; Along with China's industrialization and quickening of urbanization process; The adjustment of urban planning, city dilatation, functional areas and city layout; A large amount of contaminated industrial places have been left in the resettlement of a large amount of contaminating enterprises, the environmental pollution accident that causes thus and the harm of human health become a principal element of restriction urban land development and use.According to investigations, the pollutant that the place is left in contaminating enterprises' resettlement relates generally to organic pollution and heavy metal etc., and wherein volatility/half volatile organic contaminant is very big to ecological environment and health effects.
THE METHOD OF THERMAL DESORPTION is the restorative procedure of a kind of industrial place volatility/half volatile organic contamination.Through to the contaminated soil heating, make contaminated soil be warming up to sufficient temp, volatility/half volatile organic contaminant volatilizees from soil, separates, and makes soil be purified.Compare with other technologies, THE METHOD OF THERMAL DESORPTION has efficient, quick and safe advantage.Can the fine or not key of thermal desorption device repairing effect be that sufficiently high heating-up temperature is provided and the gaseous contaminant guaranteeing to evaporate can separate with soil fast.
Chinese patent (200910030305.6) " soil pollution thermal desorption restoration processing system " has been announced a kind of volatility and half volatile soil shifting processing system, and this system's thermal desorption device adopts heat to propose converter; The hot flue gas that heating agent adopts fuel (coal, liquefied gas or natural gas) burning to produce.Utilize hot flue gas heating cold air, cold air is heated up, entering heat is proposed converter and is contacted with contaminated soil.Hot air temperature generally is lower than 350 ℃ in this patent; Again because the specific heat capacity of air is less; The soil heated temperatures can be too not high, thereby only can handle lower benzene of contaminated soil mid-boiling point and benzene series thing, can not satisfy municipal pollution place organic pollution complexity and multifarious demand.
The retrieval pertinent literature shows, finds the document with the organic pollution soil repair system of similar structures of the present invention in present patent application a few days ago.
Summary of the invention
The system that the purpose of this invention is to provide a kind of forced ventilation-helical stir thermal desorption renovation of organic pollution soil; Got in the thermal desorption device by the hot-air after the preheating, fully contact, utilize electrical heating elements heating soil simultaneously with contaminated soil; Contaminated soil is heated to sufficient temp; Make volatility/half volatile pollutant from soil, volatilize, taken away fast and be processed that soil is purified by thermal current.
The present invention adopts following technical scheme:
The system of a kind of forced ventilation-helical stir thermal desorption renovation of organic pollution soil; Comprise air preheating system, exhaust treatment system, control system, removing this main is also to have comprised the helical stir thermal desorption system that is made up of electrical heating elements and spiral agitator.Said helical stir thermal desorption system is between air preheating system and exhaust treatment system.
Wherein:
(1) air preheating system
Air preheating system is made up of air blast and air heater, and air gets into air heater through air blast via seamless steel pipe, and then gets into helical stir thermal desorption system.
(2) helical stir thermal desorption system
A kind of helical stir thermal desorption system is made up of helical stir thermal desorption device and air-introduced machine, and the helical stir thermal desorption device is a cylindrical device, in spiral agitator is housed, outer wall is provided with electrical heating elements.Spiral agitator is driven by variable-frequency motor, and is equipped with decelerator, the spiral agitator rotating speed adjustable.Contaminated soil is added by the feed hopper that is provided with sealing device; Through electrical heating elements indirect soil; Getting into thermal desorption device after the air preheat simultaneously contacts with the contaminated soil mixing; Make that volatility/semi-volatile organic matter evaporates in the contaminated soil, under the effect of compressed air and air-introduced machine, flow out the thermal desorption system fast and get into exhaust treatment system.In the spiral agitator established guarantee the thermally equivalent of contaminated soil on the one hand; Play simultaneously and advance to handle soil and arrive discharging opening and discharge the effect of system from charging aperture, and can be through the adjustable screw agitator speed control time of staying of soil in the thermal desorption system.In addition, preheated air not only directly heats soil, has improved heat transfer efficiency and has improved the level of disruption of air-flow in the thermal desorption system, has reduced resistance of gas mass transfer, has improved the rate of volatilization of pollutant.Variable-frequency motor connects shaft joint through decelerator, and shaft joint is connected with axle, and axle is provided with impeller.
(3) exhaust treatment system
Exhaust treatment system is made up of cyclone dust collectors, dehumidifier and adsorption tower, handles the waste gas of discharging in the thermal desorption system, makes its qualified discharge.Cyclone dust collectors, dehumidifier and adsorption tower are connected in turn between the helical stir thermal desorption device and air-introduced machine of helical stir thermal desorption system.
(4) control system
Control the system integration the automatic control of air blast, air heater, helical stir thermal desorption device and air-introduced machine.
Through regulating stop (heating) time of air blast discharge pipe valve opening adjustable air flow, control air heater heating-up temperature scalable preheated air temperature, control spiral agitator rotating speed adjustable joint soil, the control electrical heating elements heating-up temperature scalable soil moisture.
Beneficial effect
According to the system of forced ventilation of the present invention-thermal desorption method renovation of organic pollution soil, can effectively repair volatility/semi-volatile organic matter contaminated soil.Its beneficial effect has following specifically:
(1) with the similar products at home and abroad ratio, equipment flowsheet is simply effective, takes up an area of for a short time, and investment cost is low;
(2) the present invention adopts Electric heating to contaminated soil; Cleaning is reliable; Remedied the deficiency that adopts fuel combustion to produce high-temperature flue gas heating soil mode and cause fume emission increase atmospheric environment risk, and in the entire equipment flow process, tail gas has effectively been handled; But qualified discharge has been stopped the generation of secondary pollution;
(3) its spiral agitator rotating speed adjustable of helical stir thermal desorption of the present invention system, handling soil, in thermal desorption device, to stop (heating) time controlled, and the soil heating-up temperature is controlled; Treatment system comprises preheated air forced ventilation directly heating and two kinds of mode of heatings of electrical heating elements indirect; And can effectively dispose dual mode through regulating preheated air flow and heating-up temperature, guarantee contaminated soil is carried out cost-effective processing; Thereby organic pollution complexity in the contaminated soil had good adaptive capacity, and not only can handle organic matters such as the lower benzene of boiling point, toluene, the organic matter of higher also there is the good treatment effect;
(4) the present invention generally can reach 70-90% to the disposable clean-up effect of volatility/half volatile organic contaminant in the contaminated soil.
Description of drawings
Fig. 1 is the structural representation of one embodiment of the present invention.
Among Fig. 1: 1 is that air blast, 2 is that air heater, 3 is that helical stir thermal desorption device, 4 is that cyclone dust collectors, 5 are that dehumidifier, 6 is that adsorption tower, 7 is that air-introduced machine, 8 is a control cabinet.
Fig. 2 is a helical stir thermal desorption device structural representation.
Among Fig. 2: 3-1 is that variable-frequency motor, 3-2 are that decelerator, 3-3 are that shaft coupling, 3-4 are that air inlet pipe, 3-5 are that impeller, 3-7 are that feed hopper, 3-8 are that cast aluminium heating collar, 3-9 are that cylindrical shell, 3-10 are that discharge nozzle, 3-11 are escape pipe for axle, 3-6.
The specific embodiment
Followingly specify the present invention according to accompanying drawing.
The structural representation of one embodiment of the present invention is seen Fig. 1.The present invention is made up of air preheating system, helical stir thermal desorption system, exhaust treatment system and control system.
Air preheating system is made up of air blast 1 and air heater 2.Air blasts air heater 2 through air blast 1, is heated to temperature required back and gets into helical stir thermal desorption device 3.Installing ball valve and spinner flowmeter on air blast 1 back air pipe line, control valve control air flow; Air heater 2 is cylindric, inner diameter of steel flue 200mm, and long 1300mm is made by stainless steel material, and built-in U-shaped stainless steel heating tube lays the aluminium silicate wool insulation material outward, adds quantity of hot air and can reach 120m
3/ h, heating-up temperature can reach 300 ℃.Air blast 1 all links to each other with control cabinet 8 with air heater 2, can show automatically and control adds hot air temperature.
Helical stir thermal desorption system is made up of helical stir thermal desorption device 3 and air-introduced machine 7.Helical stir thermal desorption device 3 structural representations are seen Fig. 2.Helical stir thermal desorption device 3 is a cylindrical device, is made by stainless steel material.Cylindrical shell 3-9 internal diameter 250mm, long 2500mm, thick 11.5mm; Installing one spiral agitator in the tube is made up of helical form impeller 3-6 and axle 3-5, and axle 3-5 links with variable-frequency motor 3-1 and decelerator 3-2 under the effect of shaft coupling 3-3; Its axis 3-5 diameter 50mm; Impeller 3-6 diameter 230mm, spacing 50mm, variable-frequency motor 3-1 power is 3kW; Rotating speed adjustable, speed adjustable range are 0.5～50 rev/min; Electrical heating elements adopts the cast aluminium heating collar, and drum outer wall is provided with 6 cast aluminium heating collar 3-8, every power 3kW, 18kW altogether; Cast aluminium heating collar 3-8 is provided with heat-insulation layer outward.Contaminated soil is after pulverization process; Sieve; Particle diameter gets into helical stir thermal desorption device 3 less than the contaminated soil of 1cm through the feed hopper 3-7 that is provided with sealing device, and preheated air gets into helical stir thermal desorption device 3 by air inlet pipe 3-4, and the contaminated soil in the cylindrical shell 3-9 is pushed ahead under the effect of helical form impeller 3-6; And with the preheated air mixing, contact, direct heat transfer, simultaneously cast aluminium heating collar 3-8 indirect soil.Spiral agitator can also guarantee the abundant mixing of contaminated soil, and it is heated evenly.When soil reached sufficient temp, volatility/semi-volatile organic matter evaporated in the contaminated soil, under the effect of compressed air and air-introduced machine, flowed out helical stir thermal desorption device 3 fast via escape pipe 3-11 and got into exhaust treatment system; Soil after the heat treated is discharged the thermal desorption system via discharge nozzle 3-10 under the effect of spiral agitator.Helical stir thermal desorption device 3 all links to each other with control cabinet with air-introduced machine 7, and spiral agitator rotating speed and soil heating-up temperature all can show and control automatically.Through adjustable screw agitator speed control stop (heating) time of soil in the thermal desorption system, when 0.5 rev/min of minimum speed, contaminated soil reaches as high as 80 minutes in the intrasystem time of staying of thermal desorption.In addition, preheated air not only directly heats soil, has improved heat transfer efficiency and has improved the level of disruption of air-flow in the thermal desorption system, has reduced resistance of gas mass transfer, has improved the rate of volatilization of pollutant.
Exhaust treatment system is made up of cyclone dust collectors 4, dehumidifier 5 and adsorption tower 6.Cyclone dust collectors 4, dehumidifier 5 and adsorption tower 6 are made by carbon steel material.The tail gas of being discharged by helical stir thermal desorption system 3 at first gets into cyclone dust collectors 4, and the particle in the tail gas is under action of centrifugal force and flow separation, and air-flow leaves cyclone dust collectors 4 backs and gets into dehumidifiers 5.In the dehumidifier 5 structured packing is housed, the effect of dehumidifier 5 mainly is to remove air and contaminated soil gets into the moisture in the tail gas because of the heat volatilization, guaranteeing the efficient operation of follow-up tail gas adsorption treatment, and plays the effect of protection air-introduced machine.Tail gas after the dehumidifying flows in the adsorption tower 6, and the high-performance biomass environmental absorbing material or the active carbon of preparation voluntarily is housed in the adsorption tower 6, and the volatility/semi-volatile organic matter in the tail gas is adsorbed agent absorption, but tail gas qualified discharge after the adsorption treatment.
The control system is the integrated automatic control of air blast 1, air heater 2, helical stir thermal desorption device 3 and air-introduced machine 7 in control cabinet.
The complete equipment floor space is 8m * 5m, needs 40m approximately
2, total installation of generating capacity is 23～42kW, the soil moisture reaches as high as more than 450 ℃; Treating capacity changes with the variation of heating-up temperature, is example to handle benzene, is heated to 100 ℃, and treating capacity is about 0.5 ton/hour.
Claims (5)
1. the system of forced ventilation-helical stir thermal desorption renovation of organic pollution soil; Comprise air preheating system, exhaust treatment system and control system; It is characterized in that: also comprised the helical stir thermal desorption system that is made up of helical stir thermal desorption device (3) and air-introduced machine (7), said helical stir thermal desorption system is between air preheating system and exhaust treatment system; Said helical stir thermal desorption device (3) is a cylindrical device; Form by cylindrical shell, spiral agitator and electrical heating elements; Wherein said spiral agitator is made up of variable-frequency motor (3-1), decelerator (3-2), shaft joint (3-3), axle (3-5) and impeller (3-6); Said variable-frequency motor (3-1) connects shaft joint (3-3) through decelerator (3-2), and shaft joint (3-3) is connected with axle (3-5), and axle (3-5) is provided with impeller (3-6).
2. the system of forced ventilation according to claim 1-helical stir thermal desorption renovation of organic pollution soil, it is characterized in that: the impeller of said spiral agitator (3-6) is the helical form impeller of rotating speed adjustable, its rotational speed regulation scope is 0.5～50 rev/min.
3. the system of forced ventilation according to claim 1-helical stir thermal desorption renovation of organic pollution soil, it is characterized in that: said electrical heating elements is located at said cylinder body outer wall, and said electrical heating elements is the cast aluminium heating collar.
4. the system of forced ventilation according to claim 1-helical stir thermal desorption renovation of organic pollution soil is characterized in that: said air preheating system is made up of air blast (1) and air heater (2).
5. the system of forced ventilation according to claim 1-helical stir thermal desorption renovation of organic pollution soil; It is characterized in that: said exhaust treatment system is made up of cyclone dust collectors (4), dehumidifier (5) and adsorption tower (6), and cyclone dust collectors (4), dehumidifier (5) and adsorption tower (6) are connected in turn between the helical stir thermal desorption device (3) and air-introduced machine (7) of helical stir thermal desorption system.
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| CN2010105554000A CN101972773B (en) | 2010-11-23 | 2010-11-23 | System for restoring organic contaminated soil by forced ventilation and spiral stirring thermal desorption |
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| CN101972773B true CN101972773B (en) | 2012-04-18 |
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