CN104289513A - Device and method applied to thermal desorption treatment of mercury-contaminated soil - Google Patents
Device and method applied to thermal desorption treatment of mercury-contaminated soil Download PDFInfo
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Abstract
The invention discloses a device and a method applied to thermal desorption treatment of mercury-contaminated soil. The device comprises a pretreatment unit, a charging unit, a fuel supply unit, a thermal desorption unit, a high-temperature dust removal unit, a condensate water treatment unit, a discharging unit, a tail gas cooling unit and a tail gas treatment unit, wherein the pretreatment unit is connected with the charging unit; the charging unit, the fuel supply unit, the discharging unit and the high-temperature dust removal unit are connected with the thermal desorption unit; the high-temperature dust removal unit is connected with the tail gas cooling unit; the tail gas cooling unit is connected with the tail gas treatment unit and the condensate water treatment unit; the condensate water treatment unit is connected with the discharging unit; the thermal desorption unit adopts a thermal screw conveyor. According to the device, the contaminants are indirectly heated, volatilized and separated out of the contaminated soil, so that the mercury in the mercury-contaminated soil can be effectively removed; meanwhile, the mercury in the tail gas can be recycled and desorbed by a hydrocyclone separation method; and the up-to-standard emission of the tail gas and the wastewater can be achieved.
Description
Technical field
The present invention relates to a kind of packaged type system of carrying out disposal and recovery mercury for mercury contaminated soil employing thermal desorption processes, belong to contaminated soil remediation field.
Background technology
China is maximum mercury producing country and country of consumption, and the mercury that coal-fired, mercury ore adopts the major polluting sources discharges such as smelting, non-ferrous metal metallurgy enterprise and cement plant has polluted ambient atmosphere, water body and soil, and local pollution is serious.According to data according to a preliminary estimate, the soil erosion that China is mercury-contaminated has 3.2 × 10
4ha, the annual mercury producing contaminated environment reaches 1.9 × 10
8kg.Thermal desorption processes is one of optimization process technology of high concentration mercury contaminated soil, adopt direct or indirect mode of heating, contaminated soil is heated to sufficiently high temperature and after keeping a period of time, pollutant is volatilized and the process separated from polluted soil, and it has processing time short, treatment effect high.
At present, the thermal desorption equipment of the existing form such as rotary kiln, conveyor furnace is used for the thermal desorption process of mercury contaminated soil both at home and abroad, effectively can remove the mercury in contaminated soil.But there is the problems such as the packaged type equipment that is not suitable as, tail gas generation are large in the equipment of the above-mentioned type.Meanwhile, the desorption tail gas produced in thermal desorption process and waste water treatment process are also still left to be desired, to avoid secondary pollution; On the other hand, for realizing the recycling of mercury, in the treatment process of mercury contaminated soil, also need the recovery considering mercury.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, a kind of mercury contaminated soil thermal desorption treating apparatus and method are provided.
The object of the invention is to be achieved through the following technical solutions: a kind of mercury contaminated soil thermal desorption treating apparatus, comprises pretreatment unit, feed unit, fuel supply unit, thermal desorption unit, high-temperature dust removal unit, condensed water processing unit, discharging unit, tail gas cooling unit and tail gas treating unit; Described pretreatment unit is connected with feed unit, feed unit, fuel supply unit, discharging unit are all connected with thermal desorption unit with high-temperature dust removal unit, high-temperature dust removal unit is connected with tail gas cooling unit, tail gas cooling unit is connected with condensed water processing unit with tail gas treating unit, and condensed water processing unit is connected with discharging unit;
The auger conveyor that described thermal desorption unit comprises burner, combustion chamber and is installed in combustion chamber, burner is positioned at below combustion chamber; Hot auger conveyor is connected with feed unit, and pending soil is transported to hot auger conveyor by feed unit; Burner is connected with fuel supply unit, fuel supply unit by fuel area density in burner; Combustion fuel in the burner, by the pending soil in hot auger conveyor at 300 ~ 500 DEG C of heat treatment 20 ~ 30 min, makes to evaporate from soil containing mercury contaminants, and the soil be separated containing mercury contaminants is delivered to discharging unit;
Described high-temperature dust removal unit comprises one-level high-temperature dust removal equipment, secondary high-temperature dust removal equipment and high-temperature gas conveyance conduit, and one-level high-temperature dust removal equipment is connected by high-temperature pipe with hot auger conveyor; Secondary high-temperature dust removal equipment is by high-temperature gas conveyance conduit and one-level high-temperature dust removal equipment connection, and the desorption tail gas that thermal desorption unit produces, successively through one-level high-temperature dust removal equipment, secondary high-temperature dust removal equipment, removes solid particulate matter in desorption tail gas; Elevated temperature desorption tail gas through dust removal process is transported to tail gas cooling unit through high-temperature gas conveyance conduit;
Described tail gas cooling unit comprises heat exchanger, circulating water cooling system and cyclic water tank, heat exchanger comprises gas passage and circulating water channel, the air inlet of gas passage is connected with secondary high-temperature dust removal equipment by high-temperature gas conveyance conduit, the gas outlet of gas passage is connected with tail gas treating unit, be provided with condensed water delivery port bottom gas passage, condensed water delivery port is connected with condensed water processing unit by pipeline; Circulating water channel, circulating water cooling system, cyclic water tank connect successively, form a closed-loop path, and the trend of cooling water and tail gas move towards contrary; High-temperature tail gas after high-temperature dust removal cell processing is after heat exchanger cooling, and transport to tail gas treating unit by pipeline, the steam in high-temperature tail gas is condensed into aqueous water, by Cemented filling to condensed water processing unit;
Described tail gas treating unit is made up of the absorbent charcoal adsorber of plural serial stage, air-introduced machine and blast pipe, absorbent charcoal adsorber, the air-introduced machine of plural serial stage are connected successively with blast pipe, absorbent charcoal adsorber is connected with tail gas cooling unit, tail gas through cooling passes through absorbent charcoal adsorber, air-introduced machine and blast pipe successively, enters air;
Described condensed water processing unit comprises the condensed water collecting device, hydrocyclone, centrifuge, quartz sand filtration tank, absorbent charcoal adsorption tank and the rewetting water tank that connect successively, the collecting terminal of condensed water collecting device is connected with heat exchanger, and rewetting water tank is connected with discharging unit; Condensed water collecting device is delivered to hydrocyclone by pipeline after collecting the condensed water of heat exchanger generation; Hydrocyclone is separated mercury and water, and collects isolated mercury, and the waste water outflow after being separated with mercury enters centrifuge; Centrifuge is by the mud-water separation of condensed water; Sewage after mud-water separation is stored in rewetting water tank after quartz sand filtration and charcoal absorption, for the treatment of the humidification of rear soil, or processes rear discharge up to standard.
One-level high-temperature dust removal equipment, secondary high-temperature dust removal equipment and high-temperature gas conveyance conduit further in described high-temperature dust removal unit wrap up by the insulation material that 50 ~ 150 mm are thick.
A kind of mercury contaminated soil thermal desorption processing method, the method realizes at mercury contaminated soil thermal desorption treating apparatus, comprises the following steps:
(1), after pending mercury contaminated soil is carried out primary dcreening operation, fragmentation by pretreatment unit, feed unit is delivered to; The sieve aperture of described primary dcreening operation is 25 mm × 25 mm, and the particle diameter after fragmentation is 2 ~ 20 mm;
(2) feed unit step 1 is processed after soil at the uniform velocity deliver to thermal desorption unit, meanwhile, fuel is delivered to thermal desorption unit by fuel supply unit;
(3) soil that the hot auger conveyor in thermal desorption unit utilizes fuel step 2 to be sent into carries out indirect type heating, by soil heat treatment 20 ~ 30 min at 300 DEG C ~ 500 DEG C temperature, make to evaporate from soil containing mercury contaminants, and the soil be separated containing mercury contaminants is delivered in discharging unit;
(4) tail gas that step 3 is volatilized is transported in high-temperature dust removal unit through pipeline, and carries out dedusting in high-temperature dust removal unit;
(5) tail gas removing solid particulate matter through step 4 to tail gas cooling system, and is cooled to less than 40 ~ 50 DEG C by Cemented filling in tail gas cooling system; The condensed water that tail gas cooling unit produces in cooling procedure through Cemented filling in condensed water processing unit;
(6) tail gas after step 5 processes transports to tail gas treating unit by pipeline, qualified discharge after the charcoal absorption in tail gas treating unit; Meanwhile, in condensed water processing unit, through revolving, mercury is separated the condensed water that produces of step 5, add discharging unit to after centrifugal and charcoal absorption process;
(7) water after the soil after step 3 being processed processes with step 6 mixes with high temperature drying soil after process in discharging unit, carries out cooling add wet process to soil after process.
Compared with prior art, the present invention has the following advantages:
(1) adopt hot auger conveyor, realized the thermal desorption process of mercury contaminated soil by indirect, the Mercury In Soil concentration after process is not higher than 10 mg/kg;
(2) by containing the volatilization of mercury contaminants, decomposition, condensation and the process such as waterpower is separated, mercury in recyclable mercury contaminated soil, the rate of recovery can reach 95% ~ 99%, realizes the recycling of mercury;
(3) native system adopts modularized design, can installation and removal rapidly, possesses mobility, can be used for different regions contaminated site recovery project, the demand meet equipment fast transfer, using continuously;
(4) adopt the mode of indirect to carry out thermal desorption, desorption tail gas generation is less, and tail gas, after secondary high-temperature dust removal, indirectly cooling, charcoal absorption, realizes qualified discharge;
(5) adopting high-temperature dust removal technology that exhaust temperature in deduster can be avoided to reduce makes water vapor condensation block deduster and gas pipeline, effectively avoid the blocking that in follow-up tail gas cooling unit, cooling device and gas pipeline occur because of control of dust, suspended solid (SS) content in the condensed water of tail gas coolant flat can be reduced, reduce condensed water intractability, can avoid again being adsorbed by the solid particle tail gas from contaminated soil desorption gaseous contaminant out simultaneously;
(6) waste water can be used for processing after the process such as hydrocyclone separation technology mercury, centrifugation, quartz sand filtration, charcoal absorption after the humidification of soil or qualified discharge;
(7) thermal desorption unit can abundant composite pollution soil, makes it to be heated evenly, improve thermal desorption treatment effect;
(8) pass through the heat loss of minimizing thermal desorption process, improve heat-transfer effect, reduce its thermal energy consumption.
Accompanying drawing explanation
Fig. 1 is the workflow diagram of mercury contaminated soil thermal desorption treating apparatus.
Detailed description of the invention
A kind of mercury contaminated soil thermal desorption treating apparatus, comprises pretreatment unit, feed unit, fuel supply unit, thermal desorption unit, high-temperature dust removal unit, condensed water processing unit, discharging unit, tail gas cooling unit and tail gas treating unit; Described pretreatment unit is connected with feed unit, feed unit, fuel supply unit, discharging unit are all connected with thermal desorption unit with high-temperature dust removal unit, high-temperature dust removal unit is connected with tail gas cooling unit, tail gas cooling system is connected with condensed water processing unit with tail gas treating unit, and condensed water processing unit is connected with discharging unit;
Described feed unit, can be made up of belt conveyer scale and belt conveyor, and pending soil is deposited and evenly fallen on belt conveyor through belt conveyer scale, is then transported in hot auger conveyor by belt conveyor.
Described fuel supply unit, can be made up of fuel tank, fuel supply conduit, fuel storage, in fuel tank, is transported in burner by fuel supply conduit.Again fuel supply conduit can also install a fuel flow controller, for controlling the feed rate of fuel.
Described thermal desorption unit comprises burner, combustion chamber and the axis direction auger conveyor through combustion chamber, and burner is positioned at below combustion chamber; Hot auger conveyor is connected with feed unit, and burner is connected with fuel supply unit; Combustion fuel in the burner, by heat treatment 20 ~ 30 min at 300 DEG C ~ 500 DEG C temperature of the soil in hot auger conveyor, makes to evaporate from soil containing mercury contaminants, and delivers in discharging unit by the soil be separated containing mercury contaminants;
Described high-temperature dust removal unit comprises one-level high-temperature dust removal equipment, secondary high-temperature dust removal equipment and high-temperature gas conveyance conduit, one-level high-temperature dust removal equipment, secondary high-temperature dust removal equipment connect successively, one-level high-temperature dust removal equipment is connected with hot auger conveyor by high-temperature gas conveyance conduit, the tail gas that thermal desorption unit produces, successively through one-level high-temperature dust removal equipment, secondary high-temperature dust removal equipment, removes the solid particulate matter contained in mercury contaminants of volatilization; The elevated temperature desorption tail gas removing solid particulate matter is transported to tail gas cooling system by high-temperature gas conveyance conduit; One-level high-temperature dust removal equipment in high-temperature dust removal unit and secondary high-temperature dust removal and connecting pipe are by the thick insulation material parcel of 50 ~ 150 mm, effectively avoid the blocking that in follow-up tail gas cooling unit, cooling device and gas pipeline occur because of control of dust, suspended solid (SS) content in the condensed water of tail gas coolant flat can be reduced, reduce condensed water intractability, can avoid again being adsorbed by the dust granules tail gas from contaminated soil desorption gaseous contaminant out simultaneously;
Described tail gas cooling unit comprises heat exchanger, circulating water cooling system and cyclic water tank, heat exchanger comprises gas passage and circulating water channel, the air inlet of gas passage is connected with secondary high-temperature dust removal equipment by high-temperature gas conveyance conduit, the gas outlet of gas passage is connected with tail gas treating unit, be provided with condensed water delivery port bottom gas passage, condensed water delivery port is connected with condensed water processing unit by pipeline; Circulating water channel, circulating water cooling system, cyclic water tank connect successively, form a closed-loop path, and the trend of cooling water and tail gas move towards contrary; Water in cyclic water tank enters circulating water channel, cools the high-temperature tail gas in gas passage, and the recirculated water laggard circulating water cooling system that is heated cools, and cooled recirculated water enters cyclic water tank.Pollutant after high-temperature dust removal cell processing, after heat exchanger cooling, transports to tail gas treating unit by pipeline; Containing a large amount of steam in tail gas after the dedusting of secondary high-temperature dust removal equipment, after steam is caught a cold in heat exchanger, form condensed water, this condensed water by Cemented filling to condensed water processing unit;
Tail gas treating unit is made up of the absorbent charcoal adsorber of plural serial stage, air-introduced machine and blast pipe, absorbent charcoal adsorber, the air-introduced machine of plural serial stage are connected successively with blast pipe, air-introduced machine can make thermal desorption unit keep tiny structure, to ensure to produce solid particulate matter as few as possible in the not excessive and thermal desorption process of thermal desorption gas out.Absorbent charcoal adsorber is connected with tail gas cooling unit, and the tail gas through cooling passes through absorbent charcoal adsorber, air-introduced machine and blast pipe successively, enters air;
Described condensed water processing unit comprises the condensed water collecting device, hydrocyclone, centrifuge, quartz sand filtration tank, absorbent charcoal adsorption tank and the rewetting water tank that connect successively, the collecting terminal of condensed water collecting device is connected with heat exchanger, and rewetting water tank is connected with discharging unit; The condensed water that condensed water collecting device heat exchanger produces is collected, and the condensed water of collection is transported to hydrocyclone by pipeline, hydrocyclone utilizes the difference in specific gravity of mercury and water and rotating separation effect to realize being separated of mercury and water, and isolated mercury is collected, waste water after being separated with mercury proceeds to centrifuge through overflow, remove the mud in condensed water, sewage after mud-water separation is after quartz sand filtration and charcoal absorption, be stored in rewetting water tank, for the treatment of after the humidification of soil, or process rear discharge up to standard.
Described discharging unit can connect to form with conveyer and mixer, soil after thermal desorption unit process is transported in mixer by conveyer, water in rewetting water tank is input in mixer by pipeline, and soil mixes with water by mixer, completes the process of mercury contaminated soil thermal desorption.
A kind of mercury contaminated soil thermal desorption processing method, the method realizes at mercury contaminated soil thermal desorption treating apparatus, comprises the following steps:
(1) (sieve aperture is 15 ~ 25 mm × 15 ~ 25mm) is sieved above the vibratory sieve using forklift the mercury contaminated soil after airing to be transported on pretreatment unit, to remove the foreign material such as stone, use forklift that the contaminated soil through screening is transported in the feed hopper of compound crusher afterwards, contaminated soil is through composite breaking crusher machine.Pretreated soil particle diameter is 2 ~ 20 mm, and its moisture content is not higher than 20%.Contaminated soil after pretreatment, can reduce the wearing and tearing of soil to equipment, control the uniformity of soil particle diameter simultaneously, ensures treatment effect;
(2) use forklift that pretreated for step 1 contaminated soil is delivered in the feed hopper of weight-loss type belt conveyer scale of feed unit, contaminated soil after the computation weigh of belt conveyer scale even drop down in belt conveyor feed hopper, under the lifting conveying of belt conveyor, even drop down is to the feed hopper of thermal desorption unit; Meanwhile, fuel is delivered in the combustion chamber in thermal desorption unit by fuel supply unit;
(3) in feed hopper, soil enters hot auger conveyor, by being arranged on the operation of burner on combustion chamber, soil in hot auger conveyor is heated, and by soil at 300 ~ 500 DEG C of heat treatment 20 ~ 30 min, make to evaporate from soil containing mercury contaminants, and the soil be separated containing mercury contaminants is delivered in discharging unit; Adopt hot auger conveyor in this step, realized the thermal desorption process of mercury contaminated soil by indirect, the Mercury In Soil concentration after process is not higher than 10 mg/kg;
(4) tail gas that step 3 is volatilized is transported in high-temperature dust removal unit through pipeline, under the air-introduced machine effect that high-temperature tail gas is arranged below at tail gas treating unit, successively by one-level high-temperature dust removal equipment (thick dedusting), secondary high-temperature dust removal equipment (meticulous dedusting).After secondary high-temperature dust removal equipment, the solid particulate matter in tail gas can remove 99%.
(5) tail gas removing solid particulate matter through step 4 is by Cemented filling to tail gas cooling system, and high-temperature tail gas enters heat exchanger by heat exchanger air inlet, and gas outlet goes out heat exchanger; Trend and the tail gas of cooling water move towards contrary; Condensation water collection mouth is arranged on the bottom of heat exchanger, and has pipeline and condensed water processing unit to link together.Tail gas is after heat exchanger, temperature can be reduced to less than 40 DEG C, and the steam in tail gas is cooled to aqueous water, with guarantee water content in cooled tail gas and mercury content enough low, alleviate the load of follow-up tail gas treating unit, also increase the rate of recovery of mercury.
(6) tail gas after step 5 processes transports to tail gas treating unit by pipeline, the charcoal absorption in tail gas treating unit, is discharged in air; Meanwhile, the condensed water that step 5 produces enters condensed water processing unit, utilizes the difference in specific gravity of mercury and water and rotary centrifugal force to realize being separated of mercury and water, and collect isolated mercury by hydrocyclone; Waste water after being separated with mercury proceeds to centrifuge through overflow, and remove most of mud of in condensed water 95% ~ 98%, the sewage after mud-water separation, after quartz sand filtration and charcoal absorption, adds discharging unit to;
(7), after the water after the soil after step 3 being processed processes with step 6 mixes in discharging unit, complete the process of mercury contaminated soil thermal desorption.
The treating capacity of described mercury contaminated soil thermal desorption treating apparatus is 2 ton/h, and running temperature is 400 ~ 450 DEG C, and floor space is 45 m × 25 m.Before treatment, mercury contaminated soil total mercury concentration is 180 ~ 1000 mg/kg, and moisture content is less than 20 %.After thermal desorption process, Mercury In Soil concentration is 6 ~ 9.5 mg/kg; Tail gas is treated reaches " discharge standard of air pollutants " (GB16297-1996), and its total mercury concentration is 300 ~ 400 ng/m
3; Waste water reaches after treatment " sewage enters municipal sewage system water standard " (CJ3082-1999), and its total mercury concentration is 0.005 ~ 0.018 mg/L.
Below be schematically described the invention and embodiment thereof, this description does not have restricted, and shown in accompanying drawing is also one of embodiments of the present invention, and actual structure is not limited thereto.So, if those of ordinary skill in the art enlightens by it, when not departing from this creation aim, designing the frame mode similar to this technical scheme and embodiment without creationary, the protection domain of this patent all should be belonged to.
Claims (3)
1. a mercury contaminated soil thermal desorption treating apparatus, it is characterized in that, comprise pretreatment unit, feed unit, fuel supply unit, thermal desorption unit, high-temperature dust removal unit, condensed water processing unit, discharging unit, tail gas cooling unit and tail gas treating unit; Described pretreatment unit is connected with feed unit, feed unit, fuel supply unit, discharging unit are all connected with thermal desorption unit with high-temperature dust removal unit, high-temperature dust removal unit is connected with tail gas cooling unit, tail gas cooling unit is connected with condensed water processing unit with tail gas treating unit respectively, and condensed water processing unit is connected with discharging unit;
Described thermal desorption unit comprises burner, combustion chamber and is installed on the hot auger conveyor in combustion chamber, and burner is positioned at below combustion chamber; Hot auger conveyor is connected with feed unit, and pending soil is transported to hot auger conveyor by feed unit; Burner is connected with fuel supply unit, fuel supply unit by fuel area density in burner; Combustion fuel in the burner, by the pending soil in hot auger conveyor at 300 ~ 500 DEG C of heat treatment 20 ~ 30 min, makes to evaporate from soil containing mercury contaminants, and the soil be separated containing mercury contaminants is delivered to discharging unit;
Described high-temperature dust removal unit comprises one-level high-temperature dust removal equipment, secondary high-temperature dust removal equipment and high-temperature gas conveyance conduit, and one-level high-temperature dust removal equipment is connected by high-temperature pipe with hot auger conveyor; One end of secondary high-temperature dust removal equipment is by high-temperature gas conveyance conduit and one-level high-temperature dust removal equipment connection, and other end one end is connected with tail gas cooling unit by high-temperature gas conveyance conduit; The desorption tail gas that thermal desorption unit produces, successively through one-level high-temperature dust removal equipment, secondary high-temperature dust removal equipment, removes solid particulate matter in desorption tail gas; Elevated temperature desorption tail gas through dust removal process is transported to tail gas cooling unit through high-temperature gas conveyance conduit;
Described tail gas cooling unit comprises heat exchanger, circulating water cooling system and cyclic water tank, heat exchanger comprises gas passage and circulating water channel, the air inlet of gas passage is connected with secondary high-temperature dust removal equipment by high-temperature gas conveyance conduit, the gas outlet of gas passage is connected with tail gas treating unit, be provided with condensed water delivery port bottom gas passage, condensed water delivery port is connected with condensed water processing unit by pipeline; Circulating water channel, circulating water cooling system, cyclic water tank connect successively, form a closed-loop path, and the trend of cooling water and tail gas move towards contrary; High-temperature tail gas after high-temperature dust removal cell processing is after heat exchanger cooling, and transport to tail gas treating unit by pipeline, the steam in high-temperature tail gas is condensed into aqueous water, by Cemented filling to condensed water processing unit;
Described tail gas treating unit is made up of the absorbent charcoal adsorber of plural serial stage, air-introduced machine and blast pipe, absorbent charcoal adsorber, the air-introduced machine of plural serial stage are connected successively with blast pipe, absorbent charcoal adsorber is connected with tail gas cooling unit, tail gas through cooling passes through absorbent charcoal adsorber, air-introduced machine and blast pipe successively, enters air;
Described condensed water processing unit comprises the condensed water collecting device, hydrocyclone, centrifuge, quartz sand filtration tank, absorbent charcoal adsorption tank and the rewetting water tank that connect successively, the collecting terminal of condensed water collecting device is connected with heat exchanger, and rewetting water tank is connected with discharging unit by pipeline; Condensed water collecting device is delivered to hydrocyclone by pipeline after collecting the condensed water of heat exchanger generation; Hydrocyclone is separated mercury and water, and collects isolated mercury, and the waste water outflow after being separated with mercury enters centrifuge; Centrifuge is by the mud-water separation of condensed water; Sewage after mud-water separation is stored in rewetting water tank after quartz sand filtration and charcoal absorption, for the treatment of the humidification of rear soil, or processes rear discharge up to standard.
2. a kind of mercury contaminated soil thermal desorption treating apparatus according to claim 1, it is characterized in that, one-level high-temperature dust removal equipment, secondary high-temperature dust removal equipment and high-temperature gas conveyance conduit in described high-temperature dust removal unit wrap up by the insulation material that 50 ~ 150 mm are thick.
3. a mercury contaminated soil thermal desorption processing method, the method realizes at mercury contaminated soil thermal desorption treating apparatus according to claim 1, and it is characterized in that, the method comprises the following steps:
(1), after pending mercury contaminated soil is carried out primary dcreening operation, fragmentation by pretreatment unit, feed unit is delivered to; The sieve aperture of described primary dcreening operation is 15 ~ 25 mm × 15 ~ 25 mm, and the particle diameter after fragmentation is 2 ~ 20 mm;
(2) feed unit step 1 is processed after soil at the uniform velocity deliver to thermal desorption unit, meanwhile, fuel is delivered to thermal desorption unit by fuel supply unit;
(3) soil that the hot auger conveyor in thermal desorption unit utilizes fuel step 2 to be sent into heats, and by soil at 300 ~ 500 DEG C of heat treatment 20 ~ 30 min, evaporate from soil containing mercury contaminants, and the soil be separated containing mercury contaminants is delivered in discharging unit;
(4) the desorption tail gas that step 3 produces is transported in high-temperature dust removal unit through pipeline, and carries out dedusting in high-temperature dust removal unit;
(5) tail gas removing solid particulate matter through step 4 to tail gas cooling unit, and is cooled to less than 40 ~ 50 DEG C by Cemented filling in tail gas cooling unit; The condensed water that tail gas cooling system produces in cooling procedure through Cemented filling in condensed water processing unit;
(6) tail gas after step 5 processes transports to tail gas treating unit by pipeline, qualified discharge after the charcoal absorption in tail gas treating unit; Meanwhile, the condensed water that step 5 produces delivers to discharging unit carry out revolving mercury separation, centrifugation and charcoal absorption process in condensed water processing unit after;
(7) water after the soil after step 3 being processed processes with step 6 mixes with high temperature drying soil after process in discharging unit, carries out cooling add wet process to soil after process.
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