CN104815842A - Skid-mounted thermal soil separation device - Google Patents

Skid-mounted thermal soil separation device Download PDF

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Publication number
CN104815842A
CN104815842A CN201410748089.XA CN201410748089A CN104815842A CN 104815842 A CN104815842 A CN 104815842A CN 201410748089 A CN201410748089 A CN 201410748089A CN 104815842 A CN104815842 A CN 104815842A
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China
Prior art keywords
sled
skid
thermal
water
gas
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CN201410748089.XA
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Chinese (zh)
Inventor
李书鹏
马骏
魏晓飞
郭丽莉
张秋子
刘渊文
孙尧
全燕苹
王璇
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北京建工环境修复股份有限公司
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Priority to CN201410748089.XA priority Critical patent/CN104815842A/en
Publication of CN104815842A publication Critical patent/CN104815842A/en

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Abstract

The invention provides a skid-mounted thermal separation device for soil. A feeding skid of the skid-mounted thermal separation device consists of a stirrer, a screening machine, a belt conveyor and a feeding hopper, wherein the front end of a thermal desorption skid is connected to the feeding skid, and the rear end of the thermal desorption skid is connected to a discharging skid; the thermal desorption skid consists of a combustion-supporting fan, a fuel device, a combustion chamber, a spiral indirect thermal decomposition furnace and a chimney; a gas treatment skid consists of a cyclone dust collector, a spray condensation tower and an active carbon bed and is used for condensing organic steam and water steam generated by the thermal desorption skid; condensate liquid is used for carrying out oil-water separation and water treatment in a water treatment skid; a heat exchange skid is used for cooling circulation water and supplying cooling water for the spray condensation tower; the whole set of equipment is systematically controlled by a control system skid. According to the skid-mounted thermal soil separation device for, an indirect oxygen-free heating manner is adopted, so the high-concentration organic polluted soil can be treated, the specific organic matters can be recycled and the exhaust gas is small in output; by virtue of the characteristic of skid-mounted integration, the device is movable and convenient to transport; the time for building on the site and the device debugging is shortened.

Description

A kind of skid-mounted type Soil Thermal separation equipment

Technical field

The present invention relates to a kind of skid-mounted type Soil Thermal separation equipment, belong to Soil Thermal separation equipment technical field.

Background technology

Thermal release, also known as thermal desorption, thermal desorption, is one of new technique of contaminated soil remediation, is mainly used in by the original position of the place soil of Organic Pollution or showering process, and can reach the reparation target of expection.It will be heated between 120 DEG C ~ 650 DEG C by the mode of directly or indirectly heating by the soil of Organic Pollution, by number of mechanisms such as desorb, heat radiation, heat transfer, pore diffusion, diffusion into the surface and outside matter streams, with physical method for separation organic contaminants in soil, make organic pollution become gaseous state to be separated with soil particle, soil after process then can backfill and continue to utilize, the processing mode of gaseous contaminant has condensation, absorption, chemical oxidation or burning etc., can select different processing modes according to organic concentration and economy.It is not destroy organic matter that thermal Release Technology makes organic pollution volatilize by control system temperature and residence time of material selectively, but within specified temperatures, can destroy wholly or in part some specific organic matter, effectively can remove the organic matter of effumability, such as benzene homologues, chlorinated solvent, volatilization petroleum hydrocarbon, aromatic hydrocarbon etc., also such as Polychlorinated biphenyls can effectively be removed, DDT, organo-chlorine pesticide is with low volatilities such as bioxin, higher boiling, the difficult organic pollution decomposed, and can once heat to reach reparation desired value for the organic pollution containing multiple different boiling, but be not suitable for containing corrosivity organic matter, active oxidizer and the process of reducing agent contaminated soil and reparation.

Existing thermal Release Technology generally adopts direct contact type rotary kiln as firing equipment.Direct contact type rotary kiln is not suitable for process high concentration organic polluted soil, organic contamination substrate concentration height can increase soil calorific value, high temperature may work the mischief to rotary kiln, even there is combustion explosion, in rotary kiln exhaust, organic concentration will lower than LEL 25%, and the Cmax of charging soil Petroleum Hydrocarbon does not generally exceed 2% of LEL.The tail that direct contact type rotary kiln produces is large-minded, and tail gas treating unit volume is comparatively large, and equipment fixes poor mobility.Direct contact type rotary kiln is in running, and debugging cycle is long, and the fault rate of equipment is higher, operation maintenance relative complex.

Summary of the invention

The object of the invention is to solve above-mentioned prior art Problems existing, namely direct contact type rotary kiln is not suitable for process high concentration organic polluted soil, the tail that direct contact type rotary kiln produces is large-minded, tail gas treating unit volume is larger, equipment mobility is poor, debugging cycle is long, and the fault rate of equipment is higher, operation maintenance relative complex.And then a kind of skid-mounted type Soil Thermal separation equipment is provided.

The object of the invention is to be achieved through the following technical solutions:

A kind of skid-mounted type Soil Thermal separation equipment, comprise: charging sled, thermal desorption sled, gas disposal sled, water treatment sled, heat exchange sled, discharging sled and control system are prized, described control system sled prizes control connection with charging sled, thermal desorption sled, gas disposal sled, water treatment sled, heat exchange sled and discharging respectively; Respective functional unit is integrated on a unsplit bedplate by described charging sled, thermal desorption sled, gas disposal sled, water treatment sled, heat exchange sled, discharging sled and control system sled respectively.

Described charging sled comprises mixer, screening machine, belt conveyor and feed hopper, described mixer is connected with screening machine with organic concentration for adjusting charging soil moisture content, described screening machine is connected with belt conveyor for adjusting charging soil particle diameter, and described belt conveyor is used for the charging soil after by process and is delivered to feed hopper;

Described thermal desorption sled comprises spiral indirect thermal stove, combustion fan, fuel-device, combustion chamber and chimney, the main body of described thermal desorption sled is spiral indirect thermal stove, spiral indirect thermal stove is connected with chimney with combustion chamber, combustion fan is connected with combustion chamber respectively with fuel-device, spiral indirect thermal stokehold end is connected with feed hopper, end is prized with discharging and is connected, and spiral indirect thermal stove is also provided with pyrolysis gas outlet;

Described gas disposal sled comprises cyclone dust collectors, spray condensing tower and active-carbon bed, described cyclone dust collectors are for removing from the bulky grain dust spiral indirect thermal stove pyrolysis gas out and being connected with spray condensing tower, spray condensing tower is for cooling from cyclone dust collectors pyrolysis gas out, the cooling water of spray condensing tower is provided by aerial cooler, the waste liquid that the condensation of spray condensing tower is got off is collected into water treatment by pipeline and prizes, on-condensible gas in spray condensing tower enters active-carbon bed purification after demister, on-condensible gas after active-carbon bed purification is delivered to combustion chamber through pipeline and fixed gas blower fan and carries out combustion decomposition.

Described water treatment sled comprises oil water separator, water treatment facilities, oil storage tank and water tank, described oil water separator is used for organic phase and aqueous phase separation, the organic phase be separated is stored in oil storage tank, the aqueous phase be separated enters water treatment facilities, oil water separator is provided with mud discharging device, the mud of discharging forms mud cake after press filtration, pressing filtering liquid imports water treatment facilities, aqueous phase after the 14 pairs of water-oil separatings of described water treatment facilities purifies and processes, a water part after process is used for the fresh water (FW) of aerial cooler, and a part is stored in water tank.

Described heat exchange sled comprises aerial cooler.

Described discharging sled comprises drawing mechanism, and described drawing mechanism is connected with the discharging opening of spiral indirect thermal stove by discharging gas lock.Water tank is connected with drawing mechanism by pipeline.

Described control system sled is automatic control system.

Compared with prior art, the present invention has the following advantages:

Skid-mounted type Soil Thermal separation equipment provided by the invention is prized by charging sled, thermal desorption sled, gas disposal sled, water treatment sled, heat exchange sled, discharging sled and control system and is formed, respective functional unit is integrated on a unsplit bedplate by each sled respectively, be convenient to mobile and transport, on-site installation work amount is few, only need complete the connection of interface pipe and external electrical, compact equipment, floor space is little.The present invention is by spiral indirect thermal stove heating soil, contaminated soil can not directly and flame contact, in pyrolysis oven, gas is lower containing oxygen degree, be applicable to process high concentration organic polluted soil (content of organics > 4%), compare the risk that direct contact type rotary kiln device reduces organic compound combustion and blast greatly.The present invention will add heat smoke and pyrolysis gas is kept apart, organic pollution is without second-time burning so need tail to be processed narrow-minded, be only 1/5 ~ 1/2 of direct contact type rotary kiln process equivalent soil generation tail gas amount, because its tail gas treating unit is less, institute, so that be designed to movable type, increases its flexibility.The present invention adopts the mode of condensation to be reclaimed by organic matter in contaminated soil, has higher energy recovery efficiency, and waste water realizes equipment Inner eycle after treatment, and fuel adopts natural gas or light diesel, and in emission, pollutant load is few, more environmental friendliness.

Accompanying drawing explanation

Fig. 1 is the structural representation of skid-mounted type Soil Thermal separation equipment of the present invention.

Reference numeral in accompanying drawing: 1 is mixer, 2 is screening machine, 3 is belt conveyor, 4 is feed hopper, 5 is spiral indirect thermal stove, 6 is combustion fan, 7 is fuel-device, 8 is combustion chamber, 9 is chimney, 10 is cyclone dust collectors, 11 is spray condensing tower, 12 is active-carbon bed, 13 is oil water separator, 14 is water treatment facilities, 15 is oil storage tank, 16 is water tank, 17 is aerial cooler, 18 is drawing mechanism, 19 is automatic control system, 20 is charging sled, 21 is thermal desorption sled, 22 is gas disposal sled, 23 is water treatment sled, 24 is heat exchange sled, 25 is discharging sled, 26 is control system sled.

Detailed description of the invention

Below in conjunction with accompanying drawing, the present invention is described in further detail: the present embodiment is implemented under premised on technical solution of the present invention, gives detailed embodiment, but protection scope of the present invention is not limited to following embodiment.

As shown in Figure 1, a kind of skid-mounted type Soil Thermal separation equipment involved by the present embodiment, comprises charging sled 20, thermal desorption sled 21, gas disposal sled 22, water treatment sled 23, heat exchange sled 24, discharging sled 25 and control system sled 26.Respective functional unit is integrated on a unsplit bedplate by described charging sled 20, thermal desorption sled 21, gas disposal sled 22, water treatment sled 23, heat exchange sled 24, discharging sled 25 and control system sled 26 respectively.

Charging sled 20 is by mixer 1, screening machine 2, belt conveyor 3 and feed hopper 4 are connected formation successively, mixer 1 is for adjusting charging soil moisture content and organic concentration, screening machine 2 is for adjusting charging soil particle diameter < 5cm, described screening machine 2 is secondary screening machine, one-level sifted bore dia is 10 ~ 15cm, secondary sifted bore dia is 1.3 ~ 5cm, the Large stone solid tailed over by crusher in crushing to < 5cm particle diameter, belt conveyor 3 adopts slope climbing type belt conveyor, soil after pretreatment is transported to feed hopper 4.

Thermal desorption sled 21 is made up of spiral indirect thermal stove 5, combustion fan 6, fuel-device 7, combustion chamber 8 and chimney 9, combustion chamber 8 adopts that refractory material is integrated poured to be formed, burner 7 is arranged on one end of combustion chamber 8, control system regulates the fuel supply rate of the air output of combustion fan 6 and fuel-device 7 to ensure chamber temperature requirement automatically, fixed gas tangentially enters combustion chamber 8, makes fixed gas complete at combustion chamber 8 internal oxidition by rational air distribution mode.Spiral indirect thermal stove 5 adopts the structure of chuck indirect, be made up of (not describing in figure) heating casing and inner bag, heating casing is provided with heating gas approach and heating exhanst gas outlet, what combustion chamber 8 provided add, and heat smoke enters in heating casing through gas approach heats inner bag, fuel adopts natural gas or light diesel, add pollutant load in heat smoke few, can directly be discharged by chimney 9 through exhanst gas outlet, heating casing lined ceramics cellucotton is incubated, reduce heat loss, improve capacity usage ratio, be provided with helical blade in inner bag carry soil and stir, the rotary speed of helical blade is controlled by variable-frequency motor, thus regulate the time of staying of soil in spiral indirect thermal stove, organic matter in soil is heated in inner bag becomes pyrolysis gas, gas disposal sled 22 is entered through pyrolysis gas outlet.Spiral indirect thermal stove 5 end is connected with drawing mechanism 18 by discharging gas lock.Feed hopper 4 is connected with spiral indirect thermal stove 5 by charging gas lock, realizes sealing charging.

Gas disposal sled 22 is by cyclone dust collectors 10, spray condensing tower 11, active-carbon bed 12 are formed, cyclone dust collectors 10 two ends connect pyrolysis gas outlet and spray condensing tower 11, for removing the bulky grain dust (particles that aerodynamic diameter > is 5 μm) in pyrolysis gas, spray condensing tower 11 carries out cold and hot exchange by recirculated cooling water with from cyclone dust collectors 10 pyrolysis gas out, pyrolysis gas enters from spray condensing tower bottom, spraying the drop counter current contacting in district and atomization, pyrolysis gas is condensed into liquid, small particle diameter dust simultaneously in pyrolysis gas also can be removed, tower is entrained with by fixed gas in order to prevent the droplet sprayed, demister is provided with on tower spray top, district, fixed gas enters active-carbon bed 12 and purifies after the demister removing droplet above spraying layer, on-condensible gas after purification is delivered to combustion chamber 8 through pipeline and fixed gas blower fan and carries out combustion decomposition.The recirculated cooling water of spray condensing tower 11 is provided by aerial cooler 17, and the waste liquid that the condensation of spray condensing tower is got off is collected into water treatment by pipeline and prizes 23.

Water treatment sled 23 is by oil water separator 13, water treatment facilities 14, oil storage tank 15, water tank 16 is formed, oil water separator 13 is for by organic phase and aqueous phase separation, the organic phase be separated is stored in oil storage tank 15, the aqueous phase be separated enters water treatment facilities 14, oil water separator 13 is provided with mud discharging device, the mud of discharging forms filter cake after press filtration, pressing filtering liquid imports water treatment facilities 14, aqueous phase after water treatment facilities 14 pairs of water-oil separatings purifies and processes, a water part after process is used for the fresh water (FW) of aerial cooler 17, a part is stored in water tank 16.

Described heat exchange sled 24 comprises aerial cooler 17.

Aerial cooler 17, using air as cooling agent, cools the recycled process water and is supplied to spray condensing tower 11.Aerial cooler 17 is primarily of tube bank, support and blower fan composition, and the hot fluid (fresh water (FW)) in pipe carries out heat exchange by tube wall and fin and pipe outer air, and air used is supplied by ventilation blower.

Discharging sled 25 comprises drawing mechanism 18.

Drawing mechanism 18 comprises wetting stirrer, conveying worm and conveyer belt etc., the discharging soil of drying is carried out water spray Agitation and mixing by wetting stirrer, the water supply of wetting stirrer is water tank and running water, wetting stirrer is entered after being pressurizeed by pumping, by controlling amount of water, the water content requirement making discharging soil reach suitable, reach the object of cooling dust suppression, last satisfactory soil is transported to district to be checked through conveying worm and conveyer belt.

Control system sled 26 comprises automaton 19.

Charging sled 20, thermal desorption sled 21, gas disposal sled 22, water treatment sled 23, heat exchange sled 24 is connected with automaton 19 respectively with discharging sled 25, automaton adopts distribute control structure, by Industrial Control Computer as host computer, realize the data acquisition and procession of control system, data management, the function such as system configuration and control algorithm, by Programmable Logic Controller (PLC) as slave computer, complete the Real-time Collection to field data and transmission, to field apparatus (as pressure fan and other motor etc.), instrument and meter is (as electrically operated valve, electrodynamic instrument etc.) control, whole system have employed the real-time communication that fieldbus realizes data.System control mode comprises automatic control mode and manual control mode, and can according to fault, out-of-limit, exceptional value, to cut the supply of water and electricity etc. and carry out reporting to the police or automatic emergency process, guarantee that security of system is normally run.

The present invention is reasonable in design, compact conformation, removable flexibly, equipment is installed, debugging cycle is short, and can process high concentration organic polluted soil, tail gas output is little, waste water realizes system Inner eycle after treatment, fuel adopts natural gas or light diesel, and in emission, pollutant load is few, more environmental friendliness.

The above; be only the present invention's preferably detailed description of the invention; these detailed description of the invention are all based on the different implementations under general idea of the present invention; and protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.

Claims (5)

1. a skid-mounted type Soil Thermal separation equipment, it is characterized in that, comprise: charging sled (20), thermal desorption sled (21), gas disposal sled (22), water treatment sled (23), heat exchange sled (24), discharging sled (25) and control system sled (26), (26) prize (20) with charging to described control system sled respectively, (21) are prized in thermal desorption, (22) are prized in gas disposal, (23) are prized in water treatment, (24) are prized in heat exchange and (25) control connection is prized in discharging; Respective functional unit is integrated on a unsplit bedplate by described charging sled (20), thermal desorption sled (21), gas disposal sled (22), water treatment sled (23), heat exchange sled (24), discharging sled (25) and control system sled (26) respectively;
Described charging sled (20) comprises mixer (1), screening machine (2), belt conveyor (3) and feed hopper (4), described mixer (1) is connected with screening machine (2) with organic concentration for adjusting charging soil moisture content, described screening machine (2) is connected with belt conveyor (3) for adjusting charging soil particle diameter, and described belt conveyor (3) is for being delivered to feed hopper (4) by the charging soil after process;
Described thermal desorption sled (21) comprises spiral indirect thermal stove (5), combustion fan (6), fuel-device (7), combustion chamber (8) and chimney (9), the main body of described thermal desorption sled (21) is spiral indirect thermal stove (5), spiral indirect thermal stove (5) is connected with chimney (9) with combustion chamber (8), combustion fan (6) is connected with combustion chamber (8) respectively with fuel-device (7), spiral indirect thermal stove (5) front end is connected with feed hopper (4), end is prized (25) and is connected with discharging, spiral indirect thermal stove (5) is also provided with pyrolysis gas outlet,
Described gas disposal sled (22) comprises cyclone dust collectors (10), spray condensing tower (11) and active-carbon bed (12), described cyclone dust collectors (10) to be connected with spray condensing tower (11) from the bulky grain dust spiral indirect thermal stove (5) pyrolysis gas out for removing, spray condensing tower (11) is for cooling from cyclone dust collectors (10) pyrolysis gas out, the cooling water of spray condensing tower (11) is provided by aerial cooler, the waste liquid that spray condensing tower (11) condensation is got off is collected into water treatment by pipeline and prizes, on-condensible gas in spray condensing tower (11) enters active-carbon bed (12) purification after demister, on-condensible gas after active-carbon bed (12) purification is delivered to combustion chamber (8) through pipeline and fixed gas blower fan and carries out combustion decomposition,
Described water treatment sled (23) comprises oil water separator (13), water treatment facilities (14), oil storage tank (15) and water tank (16), described oil water separator (13) is for by organic phase and aqueous phase separation, the organic phase be separated is stored in oil storage tank (15), the aqueous phase be separated enters water treatment facilities (14), oil water separator (13) is provided with mud discharging device, the mud of discharging forms mud cake after press filtration, pressing filtering liquid imports water treatment facilities (14), described water treatment facilities (14) purifies the aqueous phase after water-oil separating and processes, a water part after process is used for the fresh water (FW) of aerial cooler (17), a part is stored in water tank (16),
Described heat exchange sled (24) comprises aerial cooler (17);
Described discharging sled (25) comprises drawing mechanism (18), described drawing mechanism (18) is connected by the discharging opening of discharging gas lock with spiral indirect thermal stove (5), and water tank (16) is connected with drawing mechanism (18) by pipeline;
Described control system sled (26) is automatic control system (19).
2. a kind of skid-mounted type Soil Thermal separation equipment according to claim 1, it is characterized in that, described spiral indirect thermal stove (5) adopts the structure of chuck indirect, be made up of heating casing and inner bag, heating casing lined ceramics cellucotton is incubated, be provided with helical blade in inner bag carry soil and stir, what combustion chamber provided add heat smoke heats inner bag in heating casing, and discharge through chimney, organic matter in soil is heated in inner bag becomes pyrolysis gas, enters gas disposal sled (22) through pyrolysis gas outlet.
3. a kind of skid-mounted type Soil Thermal separation equipment according to claim 1, is characterized in that, described screening machine (2) is secondary screening machine, and one-level sifted bore dia is 10 ~ 15cm, and secondary sifted bore dia is 1.3 ~ 5cm.
4. a kind of skid-mounted type Soil Thermal separation equipment according to claim 1, it is characterized in that, described feed hopper (4) is connected with spiral indirect thermal stove (5) by charging gas lock, and drawing mechanism (18) is connected by the discharging opening of discharging gas lock with spiral indirect thermal stove (5).
5. a kind of skid-mounted type Soil Thermal separation equipment according to claim 1, it is characterized in that, the cooling water of described spray condensing tower (11) is provided by aerial cooler (17), the on-condensible gas that spray condensing tower (17) produces enters active-carbon bed (12) after demister, and the on-condensible gas after purification is delivered to combustion chamber (8) through pipeline and fixed gas blower fan and carries out combustion decomposition.
CN201410748089.XA 2014-12-10 2014-12-10 Skid-mounted thermal soil separation device CN104815842A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107030100A (en) * 2016-02-04 2017-08-11 北京建工环境修复股份有限公司 Thermal desorption system and thermal desorption method
CN109570217A (en) * 2019-01-18 2019-04-05 南京工业大学 It is a kind of with the heat conduction reinforced rotary organic polluted soil thermal desorption device of outer heat
CN109622587A (en) * 2019-01-18 2019-04-16 南京工业大学 A kind of rotary organic polluted soil thermal desorption device of outer heat of beam with inner pipe

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CN109570217A (en) * 2019-01-18 2019-04-05 南京工业大学 It is a kind of with the heat conduction reinforced rotary organic polluted soil thermal desorption device of outer heat
CN109622587A (en) * 2019-01-18 2019-04-16 南京工业大学 A kind of rotary organic polluted soil thermal desorption device of outer heat of beam with inner pipe
CN109570217B (en) * 2019-01-18 2020-03-06 南京工业大学 External heat rotary type organic contaminated soil thermal desorption device with heat transfer enhancement function

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