CN104289513B - A kind of mercury contaminated soil thermal desorption processing means and processing method - Google Patents
A kind of mercury contaminated soil thermal desorption processing means and processing method Download PDFInfo
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Abstract
The invention discloses a kind of mercury contaminated soil thermal desorption processing means and processing method, this device includes 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 is 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 tail gas treating unit and condensed water processing unit, condensed water processing unit is connected with discharging unit, thermal desorption unit uses hot auger conveyor, pollutant are made to volatilize and separate from polluted soil by heating indirectly, can effectively remove hydrargyrum in mercury contaminated soil, hydrargyrum during method also by hydrocyclone separation technology reclaims desorption tail gas simultaneously, and realize the qualified discharge of tail gas and waste water.
Description
Technical field
The present invention relates to a kind of packaged type system using thermal desorption processes to carry out processing and reclaim hydrargyrum for mercury contaminated soil, belong to contaminated soil remediation field.
Background technology
China is maximum hydrargyrum manufacturing country and country of consumption, and coal-fired, mercury ore is adopted the hydrargyrum of the major polluting sources discharges such as smelting, non-ferrous metal metallurgy enterprise and cement plant and 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 × 104Ha, the annual hydrargyrum producing pollution environment reaches 1.9 × 108kg.Thermal desorption processes is one of optimization process technology of high concentration mercury contaminated soil, it is to use direct or indirect mode of heating, after contaminated soil being heated to sufficiently high temperature and keeping a period of time, making pollutant volatilization the process separated from polluted soil, it has, and the process time is short, treatment effect high.
At present, the most the thermal desorption equipment of the form such as rotary kiln, conveyor furnace processes for the thermal desorption of mercury contaminated soil, can effectively remove the hydrargyrum in contaminated soil.But, there is the problems such as the packaged type equipment that is not suitable as, tail gas generation amount are big in the equipment of the above-mentioned type.The most still it is left to be desired simultaneously for desorption tail gas and the waste water treatment process produced during thermal desorption, to avoid secondary pollution；On the other hand, for realizing the recycling of hydrargyrum, in the process technique of mercury contaminated soil, also need to consider the recovery of hydrargyrum.
Summary of the invention
It is an object of the invention to for the deficiencies in the prior art, it is provided that a kind of mercury contaminated soil thermal desorption processing means and method.
It is an object of the invention to be achieved through the following technical solutions: a kind of mercury contaminated soil thermal desorption processing means, including 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 tail gas treating unit and condensed water processing unit, and condensed water processing unit is connected with discharging unit；
Described thermal desorption unit includes burner, combustor and the auger conveyor being installed in combustor, and burner is positioned at below combustor；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, and fuel supply unit delivers fuel in burner；Burn 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 delivers to discharging unit by having separated the soil containing mercury contaminants；
Described high-temperature dust removal unit includes one-level high-temperature dust removal equipment, two grades of 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；Two grades of high-temperature dust removal equipment are connected with one-level high-temperature dust removal equipment by high-temperature gas conveyance conduit, and the desorption tail gas that thermal desorption unit produces sequentially passes through one-level high-temperature dust removal equipment, two grades of high-temperature dust removal equipment, remove 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 includes heat exchanger, circulating water cooling system and cyclic water tank, heat exchanger includes gas passage and circulating water channel, the air inlet of gas passage is connected by high-temperature gas conveyance conduit and two grades of high-temperature dust removal equipment, the gas outlet of gas passage is connected with tail gas treating unit, being provided with condensed water outlet bottom gas passage, condensed water outlet is connected with condensed water processing unit by pipeline；Circulating water channel, circulating water cooling system, cyclic water tank are sequentially connected with, and form a closed-loop path, and the trend of cooling water is contrary with tail gas trend；High-temperature tail gas after high-temperature dust removal cell processing, after heat exchanger cools down, transports to tail gas treating unit by pipeline, and the steam in high-temperature tail gas is condensed into aqueous water, is pipelined 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 exhaustor, the absorbent charcoal adsorber of plural serial stage, air-introduced machine and exhaustor are sequentially connected with, absorbent charcoal adsorber is connected with tail gas cooling unit, cooled tail gas passes sequentially through absorbent charcoal adsorber, air-introduced machine and exhaustor, enters air；
Described condensed water processing unit includes condensed water collecting device, hydrocyclone, centrifuge, quartz sand filtration tank, absorbent charcoal adsorption tank and the rewetting water tank being sequentially connected with, 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 transported to hydrocyclone by pipeline after collecting the condensed water that heat exchanger produces；Hydrocyclone is by hydrargyrum and the separation of water, and collects isolated hydrargyrum, and the waste water outflow after separating with hydrargyrum 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 activated carbon adsorption, the humidification of soil after processing, or processes rear discharge up to standard.
One-level high-temperature dust removal equipment in the most described high-temperature dust removal unit, two grades of high-temperature dust removal equipment and high-temperature gas conveyance conduit are by insulation material parcel thick for 50 ~ 150 mm.
A kind of mercury contaminated soil thermal desorption processing method, the method realizes in mercury contaminated soil thermal desorption processing means, comprises the following steps:
(1) pretreatment unit pending mercury contaminated soil is carried out primary dcreening operation, broken after, deliver to feed unit；The sieve aperture of described primary dcreening operation is 25 mm × 25 mm, and the particle diameter after crushing is 2～20 mm；
(2) soil after step 1 is processed by feed unit at the uniform velocity delivers to thermal desorption unit, and 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 at a temperature of 300 DEG C ~ 500 DEG C
Min, makes to evaporate from soil containing mercury contaminants, and delivers to having separated the soil containing mercury contaminants in discharging unit；
(4) tail gas of step 3 volatilization is in high-temperature dust removal unit transported to by pipeline, and carries out dedusting in high-temperature dust removal unit；
(5) remove the tail gas of solid particulate matter through step 4 and be pipelined to tail gas cooling system, and in tail gas cooling system, be cooled to less than 40 ~ 50 DEG C；The condensed water that tail gas cooling unit produces in cooling procedure is in pipeline is transported to condensed water processing unit；
(6) tail gas after step 5 processes transports to tail gas treating unit by pipeline, qualified discharge after the activated carbon adsorption in tail gas treating unit；Meanwhile, the condensed water that step 5 produces separates through rotation hydrargyrum in condensed water processing unit, is centrifuged and adds discharging unit to after activated carbon adsorption process；
(7) soil after step 3 being processed and step 6 process after water in discharging unit with process after high temperature drying mixing with soil, soil after processing is carried out cooling and adds wet process.
Compared with prior art, the invention have the advantages that
(1) using hot auger conveyor, the thermal desorption being realized mercury contaminated soil by heating indirectly is processed, and the Mercury In Soil concentration after process is not higher than 10 mg/kg；
(2) by the volatilization containing mercury contaminants, decomposing, condense and the process such as waterpower separates, hydrargyrum in recyclable mercury contaminated soil, the response rate is up to 95%～99%, it is achieved the recycling of hydrargyrum；
(3) native system uses modularized design, can be quickly installed and dismantle, possess mobility, can be used for different regions contaminated site recovery project, meets equipment fast transfer, the demand used continuously；
(4) using the mode of heating indirectly to carry out thermal desorption, desorption tail gas generation amount is less, and tail gas is after two grades of high-temperature dust removals, indirectly cooling, activated carbon adsorption, it is achieved qualified discharge；
(5) use high-temperature dust removal technology that exhaust temperature in cleaner unit can be avoided to reduce and make water vapor condensation blocking cleaner unit and gas pipeline, it is prevented effectively from the blocking that in follow-up tail gas cooling unit, chiller and gas pipeline occur because of dust, suspended solid (SS) content in the condensed water of tail gas coolant flat can be reduced, reduce condensed water intractability, the gaseous contaminant being desorbed out from contaminated soil can be avoided again to be adsorbed by the solid particle tail gas simultaneously；
(6) humidification of soil or qualified discharge after waste water can be used for processing after hydrocyclone separation technology hydrargyrum, centrifugation, quartz sand filtration, activated carbon adsorption etc. process；
(7) thermal desorption unit can be sufficiently mixed contaminated soil, is allowed to be heated evenly, and improves thermal desorption treatment effect；
(8) scatter and disappear by the heat 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 processing means.
Detailed description of the invention
A kind of mercury contaminated soil thermal desorption processing means, including 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 tail gas treating unit and condensed water processing 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 uniformly 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, and fuel storage, in fuel tank, is transported in burner by fuel supply conduit.A fuel flow controller can also be installed again, for controlling the feed rate of fuel in fuel supply conduit.
Described thermal desorption unit includes burner, combustor and the axis direction auger conveyor through combustor, and burner is positioned at below combustor；Hot auger conveyor is connected with feed unit, and burner is connected with fuel supply unit；Burn fuel in the burner, by heat treatment 20 ~ 30 min at a temperature of 300 DEG C ~ 500 DEG C of the soil in hot auger conveyor, makes to evaporate from soil containing mercury contaminants, and delivers to having separated the soil containing mercury contaminants in discharging unit；
Described high-temperature dust removal unit includes one-level high-temperature dust removal equipment, two grades of high-temperature dust removal equipment and high-temperature gas conveyance conduit, one-level high-temperature dust removal equipment, two grades of high-temperature dust removal equipment are sequentially connected with, 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 sequentially passes through one-level high-temperature dust removal equipment, two grades of high-temperature dust removal equipment, remove volatilization containing the solid particulate matter in mercury contaminants；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 two grades of high-temperature dust removals and connect pipeline by insulation material parcel thick for 50 ~ 150 mm, it is prevented effectively from the blocking that in follow-up tail gas cooling unit, chiller and gas pipeline occur because of dust, suspended solid (SS) content in the condensed water of tail gas coolant flat can be reduced, reduce condensed water intractability, the gaseous contaminant being desorbed out from contaminated soil can be avoided again to be adsorbed by the dust granules tail gas simultaneously；
Described tail gas cooling unit includes heat exchanger, circulating water cooling system and cyclic water tank, heat exchanger includes gas passage and circulating water channel, the air inlet of gas passage is connected by high-temperature gas conveyance conduit and two grades of high-temperature dust removal equipment, the gas outlet of gas passage is connected with tail gas treating unit, being provided with condensed water outlet bottom gas passage, condensed water outlet is connected with condensed water processing unit by pipeline；Circulating water channel, circulating water cooling system, cyclic water tank are sequentially connected with, and form a closed-loop path, and the trend of cooling water is contrary with tail gas trend；Water in cyclic water tank enters circulating water channel, cools down the high-temperature tail gas in gas passage, and the recirculated water laggard circulating water cooling system that is heated cools down, and the recirculated water after cooling enters cyclic water tank.Pollutant after high-temperature dust removal cell processing, after heat exchanger cools down, transport to tail gas treating unit by pipeline；Containing substantial amounts of steam in tail gas after two grades of high-temperature dust removal equipment dedustings, after steam is caught a cold in heat exchanger, forming condensed water, this condensed water is pipelined 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 exhaustor, the absorbent charcoal adsorber of plural serial stage, air-introduced machine and exhaustor are sequentially connected with, air-introduced machine can make thermal desorption unit keep tiny structure, to ensure that thermal desorption gas out is the most excessive and to produce solid particulate matter as few as possible during thermal desorption.Absorbent charcoal adsorber is connected with tail gas cooling unit, and cooled tail gas passes sequentially through absorbent charcoal adsorber, air-introduced machine and exhaustor, enters air；
Described condensed water processing unit includes condensed water collecting device, hydrocyclone, centrifuge, quartz sand filtration tank, absorbent charcoal adsorption tank and the rewetting water tank being sequentially connected with, 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 hydrargyrum and water and rotating separation effect realizes hydrargyrum and water separates, and isolated hydrargyrum is collected, waste water after separating with hydrargyrum proceeds to centrifuge through overflow, remove the mud in condensed water, sewage after mud-water separation is after quartz sand filtration and activated carbon adsorption, it is stored in rewetting water tank, the humidification of the soil after processing, or process rear discharge up to standard.
Described discharging unit can be connected composition with conveyer and blender, soil after thermal desorption unit is processed by conveyer is transported in blender, water in rewetting water tank is input in blender by pipeline, and soil is mixed by blender with water, completes to process mercury contaminated soil thermal desorption.
A kind of mercury contaminated soil thermal desorption processing method, the method realizes in mercury contaminated soil thermal desorption processing means, comprises the following steps:
(1) (sieve aperture is 15 ~ 25 mm × 15 ~ 25mm) is sieved above the vibrosieve that use forklift is transported to the mercury contaminated soil after dry in the sun on pretreatment unit, to remove the foreign material such as stone cleaning, using 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 soil abrasion to equipment, control the uniformity of soil particle diameter, it is ensured that treatment effect simultaneously；
(2) forklift is used pretreated for step 1 contaminated soil to be delivered in the feed hopper of weight-loss type belt conveyer scale of feed unit, contaminated soil after the metering of belt conveyer scale is weighed even drop down in belt conveyor feed hopper, under the lifting of belt conveyor carries, the feed hopper of even drop down to thermal desorption unit；Meanwhile, during the combustor in thermal desorption unit delivered to by fuel by fuel supply unit；
(3) in feed hopper, soil enters hot auger conveyor, by being arranged on the operation of burner on combustor, 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 deliver to having separated the soil containing mercury contaminants in discharging unit；Using hot auger conveyor in this step, the thermal desorption being realized mercury contaminated soil by heating indirectly is processed, and the Mercury In Soil concentration after process is not higher than 10 mg/kg；
(4) tail gas of step 3 volatilization is in high-temperature dust removal unit transported to by pipeline, and high-temperature tail gas, under the air-introduced machine effect that tail gas treating unit is disposed behind, passes sequentially through one-level high-temperature dust removal equipment (thick dedusting), two grades of high-temperature dust removal equipment (fine dedusting).Solid particulate matter removable 99% after two grades of high-temperature dust removal equipment, in tail gas.
(5) removing the tail gas of solid particulate matter through step 4 and be pipelined to tail gas cooling system, high-temperature tail gas is entered heat exchanger by heat exchanger air inlet, and gas outlet goes out heat exchanger；The trend of cooling water is contrary with tail gas trend；Condensation water collection mouth is arranged on the bottom of heat exchanger, and has pipeline to link together with condensed water processing unit.Tail gas is after heat exchanger, and temperature can be reduced to less than 40 DEG C, and the steam in tail gas is cooled to aqueous water, of a sufficiently low to guarantee water content in the tail gas after supercooling and mercury content, alleviates the load of follow-up tail gas treating unit, also increases the response rate of hydrargyrum.
(6) tail gas after step 5 processes transports to tail gas treating unit by pipeline, and the activated carbon adsorption 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 hydrargyrum and water by hydrocyclone and rotary centrifugal force realizes hydrargyrum and water separates, and be collected isolated hydrargyrum；Waste water after separating with hydrargyrum proceeds to centrifuge through overflow, removes most of mud of 95% ~ 98% in condensed water, and the sewage after mud-water separation, after quartz sand filtration and activated carbon adsorption, adds discharging unit to；
(7) soil after step 3 being processed process with step 6 after water mix in discharging unit after, complete to mercury contaminated soil thermal desorption process.
The treating capacity of described mercury contaminated soil thermal desorption processing means 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, moisture content is less than 20 %.After thermal desorption processes, Mercury In Soil concentration is 6 ~ 9.5
mg/kg；Tail gas is treated to be reached " discharge standard of air pollutants " (GB16297-1996), and its total mercury concentration is 300～400 ng/m3；Waste water reaches " sewage enters municipal sewage system water standard " (CJ3082-1999) after treatment, and its total mercury concentration is 0.005 ~ 0.018
mg/L。
Below being schematically described the invention and embodiment thereof, this description does not has 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 is enlightened by it, in the case of without departing from this creation objective, design the frame mode similar to this technical scheme and embodiment without creative, the protection domain of this patent all should be belonged to.
Claims (3)
1. a mercury contaminated soil thermal desorption processing means, it is characterized in that, including 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 tail gas treating unit and condensed water processing unit respectively, and condensed water processing unit is connected with discharging unit；
Described thermal desorption unit includes burner, combustor and the hot auger conveyor being installed in combustor, and burner is positioned at below combustor；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, and fuel supply unit delivers fuel in burner；Burn 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 delivers to discharging unit by having separated the soil containing mercury contaminants；
Described high-temperature dust removal unit includes one-level high-temperature dust removal equipment, two grades of 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 two grades of high-temperature dust removal equipment is connected with one-level high-temperature dust removal equipment by high-temperature gas conveyance conduit, and the other end is connected with tail gas cooling unit by high-temperature gas conveyance conduit；The desorption tail gas that thermal desorption unit produces sequentially passes through one-level high-temperature dust removal equipment, two grades of 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 includes heat exchanger, circulating water cooling system and cyclic water tank, heat exchanger includes gas passage and circulating water channel, the air inlet of gas passage is connected by high-temperature gas conveyance conduit and two grades of high-temperature dust removal equipment, the gas outlet of gas passage is connected with tail gas treating unit, being provided with condensed water outlet bottom gas passage, condensed water outlet is connected with condensed water processing unit by pipeline；Circulating water channel, circulating water cooling system, cyclic water tank are sequentially connected with, and form a closed-loop path, and the trend of cooling water is contrary with tail gas trend；High-temperature tail gas after high-temperature dust removal cell processing, after heat exchanger cools down, transports to tail gas treating unit by pipeline, and the steam in high-temperature tail gas is condensed into aqueous water, is pipelined 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 exhaustor, the absorbent charcoal adsorber of plural serial stage, air-introduced machine and exhaustor are sequentially connected with, absorbent charcoal adsorber is connected with tail gas cooling unit, cooled tail gas passes sequentially through absorbent charcoal adsorber, air-introduced machine and exhaustor, enters air；
Described condensed water processing unit includes condensed water collecting device, hydrocyclone, centrifuge, quartz sand filtration tank, absorbent charcoal adsorption tank and the rewetting water tank being sequentially connected with, 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 transported to hydrocyclone by pipeline after collecting the condensed water that heat exchanger produces；Hydrargyrum is separated by hydrocyclone with water, and collects isolated hydrargyrum, and the waste water outflow after separating with hydrargyrum 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 activated carbon adsorption, the humidification of soil after processing, or processes rear discharge up to standard.
2. according to claim 1 institute
A kind of mercury contaminated soil thermal desorption processing means stated, it is characterised in that the one-level high-temperature dust removal equipment in described high-temperature dust removal unit, two grades of high-temperature dust removal equipment and high-temperature gas conveyance conduit are by insulation material parcel thick for 50 ~ 150 mm.
3. a mercury contaminated soil thermal desorption processing method, the method is to realize in the mercury contaminated soil thermal desorption processing means described in claim 1, it is characterised in that the method comprises the following steps:
(1) pretreatment unit pending mercury contaminated soil is carried out primary dcreening operation, broken after, deliver to feed unit；The sieve aperture of described primary dcreening operation is 15 ~ 25 mm × 15 ~ 25 mm, and the particle diameter after crushing is 2～20 mm；
(2) soil after step 1 is processed by feed unit at the uniform velocity delivers to thermal desorption unit, and 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 deliver to having separated the soil containing mercury contaminants in discharging unit；
(4) the desorption tail gas that step 3 produces is in high-temperature dust removal unit transported to by pipeline, and carries out dedusting in high-temperature dust removal unit；
(5) remove the tail gas of solid particulate matter through step 4 and be pipelined to tail gas cooling unit, and in tail gas cooling unit, be cooled to less than 40 DEG C；The condensed water that tail gas cooling system produces in cooling procedure is in pipeline is transported to condensed water processing unit；
(6) tail gas after step 5 processes transports to tail gas treating unit by pipeline, qualified discharge after the activated carbon adsorption in tail gas treating unit；Meanwhile, the condensed water that step 5 produces carries out revolving after hydrargyrum separation, centrifugation and activated carbon adsorption process in condensed water processing unit delivers to discharging unit；
(7) soil after step 3 being processed process with step 6 after water mix in discharging unit after, complete to mercury contaminated soil thermal desorption process.
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| CN204122456U (en) * | 2014-10-14 | 2015-01-28 | 中节能大地环境修复有限公司 | A kind of mercury contaminated soil thermal desorption treating apparatus |
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