CN109078975A - A kind of contaminated soil is classified indirect thermal desorption coupling and catalyzing degradation repair system and method - Google Patents
A kind of contaminated soil is classified indirect thermal desorption coupling and catalyzing degradation repair system and method Download PDFInfo
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- CN109078975A CN109078975A CN201810779527.7A CN201810779527A CN109078975A CN 109078975 A CN109078975 A CN 109078975A CN 201810779527 A CN201810779527 A CN 201810779527A CN 109078975 A CN109078975 A CN 109078975A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0002—Casings; Housings; Frame constructions
- B01D46/0012—In-line filters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
- B01D46/0036—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions by adsorption or absorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
- B01D46/62—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in series
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/06—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/75—Multi-step processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8678—Removing components of undefined structure
- B01D53/8687—Organic components
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20707—Titanium
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20723—Vanadium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
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- B01D2255/20776—Tungsten
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Abstract
The present invention relates to a kind of contaminated soils to be classified indirect thermal desorption coupling and catalyzing degradation repair system and method.Low temperature thermal desorption kiln outlet in the system is connected with high temperature thermal desorption kiln entrance and condenser inlet respectively, the outlet of high temperature thermal desorption kiln is connected with discharging device entrance and cyclone dust collectors entrance respectively, and the outlet bag filter A and cyclone entrance are connected with catalytic degradation unit entrance respectively.It is classified thermal desorption kiln and indirect heating is carried out to contaminated soil using electric energy, low temperature thermal desorption kiln realizes the desiccation of contaminated soil and the desorption process of low boiling point organic pollutant, prevents moisture from further heating and cause unnecessary energy dissipation.High temperature thermal desorption kiln realizes the thorough desorption process of higher pollutant, and tail gas is after the techniques such as condensation water removal and purifying and dedusting, and gaseous-phase organic pollutant enters in catalytic degradation unit, by V2O5‑WO3/TiO2Catalytic degradation function realize pollutant exhaustive oxidation degradation, prevent the generation of secondary pollution.
Description
Technical field
The invention belongs to technical field of soil remediation, are classified indirect thermal desorption coupling in particular to a kind of contaminated soil
Catalytic degradation repair system and method are closed, can be used for organic material contaminated soil dystopy thermal desorption reparation.
Background technique
With the promulgation of economy and the fast-developing and national relevant policies of city-building, many cities are to the industrial structure
It is adjusted with urban planning, closes and moved many chemical companies, to leave lower a large amount of organic contamination place.These
Organic matter not only directly causes significant damage to soil animals and plants, microorganism or even the ecosystem, and can be sucked by steam, skin
The modes such as skin contact, food chain enter human body, and constantly enrichment in vivo, generate significant damage to human health.Such as 2004
Year, Foundation of Beijing Metro Line 5 is in the mining process of the village Song Jia building site, because of more people's poisonings caused by the volatile contaminant of place.Have
The repairing and treating work of machine contaminated site soil has become Chinese inevitable, the relationship people's livelihood significant problem, administers
The highest attention of state and society is caused with reparation demand.
In recent years, carried out extensively for all kinds of recovery techniques in organic contamination place, equipment research, related research result
It has been applied in contaminated site reparation.Thermal desorption recovery technique is high with its treatment effeciency, repairing efficiency is short, applied widely etc. excellent
Point has been widely used from the technology is adopted as a feasible soil environment recovery technique by U.S. EPA in 1985 for the first time
In contaminated sites such as soil, sludge, sediment, filter residue of the processing containing volatility and half volatile organic contaminant.Thermal desorption can
The pollutant of processing includes nitrobenzene, polybrominated diphenyl ethers (PBDEs), DDT (DDTs), hexachloro-benzene, six six six, mercury, benzene series
Object, Polychlorinated biphenyls (PCBs) and polycyclic aromatic hydrocarbon (PAHs) etc..
However, pollutant distribution is uneven in contaminated soil domain, and pollutant often boiling point with higher, in treatment process
Need to consume a large amount of thermal energy.It is counted according to the report at USN's Engineering Service center, fuel cost accounts for the 40- of operating cost
50%.In view of the gas price in the U.S. is far below domestic price, therefore fuel cost accounts for the ratio of operating cost at home
It is higher than 50%.According to the rough estimates of Practical Project, fuel cost accounts for the 60% of operating cost.Contaminated soil moisture content is to energy
The influence of consumption is especially pronounced, and Troxler is in its paper " Treatment of Pesticide-Contaminated Soils
With Thermal Desorption Technologies " in point out, be in soil organic matter content 10g/kg, specific heat capacity
Under conditions of 0.58kJ/ (kg. DEG C), 343 DEG C of heating temperature, 178 DEG C of thermal desorption exhaust temperature etc. are constant, when soil moisture content exists
When 10%-15%, the heat of heating soil consumption is substantially suitable with the energy consumption of evaporation water；And moisture content be higher than 15% when, steam
The energy consumption of shampoo point has been more than the energy of heating soil consumption.In addition, 103658165 A of Patent No. CN points out repair process
The high-temperature tail gas of generation is the major part of heat-energy losses in thermal desorption system, for traditional rotary kiln heating system, soil
Treating capacity is 25m3When/h, the thermal loss that high-temperature flue gas distributes is 30%-60%.And high-temperature flue gas is bringing heat losses
Meanwhile vent gas treatment difficulty can be also led to the problem of, lead to vent gas treatment increased costs.Therefore, how to pass through optimization thermal desorption
System reduces contaminated soil cost of disposal, has important engineering significance for reducing heat losses.
A kind of Invention Announce of Patent No. CN101530858A contaminated soil direct thermal desorption device, the equipment use
The mode of directly heating carries out thermal desorption, and heat source gas is caused to be mutually mixed with the polluted gas volatilized, and this heating method holds
It is also easy to produce secondary pollution, increases the processing cost of subsequent tail gas.
A kind of indirect thermal desorption device of persistent organism contaminated soil of the Invention Announce of patent No. CN104226681A,
The device includes contaminated soil pretreatment system, feed system, thermal desorption system, discharge system, exhaust gas purification system and automatic
Control system.Contaminated soil after pretreatment, is delivered to double-layered cylinder rotary kiln furnace body, using indirect heating, realizes pollutant
Thermal desorption process.Wherein, water vapour also absorbs a large amount of thermal temperature and increases, and system energy consumption is high and heat utilization efficiency is low, causes
The waste of the energy.
A kind of organic dirt of two-part indirect thermal desorption process of the Invention Announce of 104874593 A of Patent No. CN
Indigenous method and equipment are contaminated, the organic polluted soil in the reverse indirect heating rotary kiln of heat generated using combustion gas (oil), low
Warm waste heat section exit is drawn the water vapour generated and is condensed, and prevent that water vapour from entering that high temperature section heating causes heat need not
It loses.But it is relatively more limited to supply the regional application such as inadequate for natural gas, fuel oil etc. for the covering device；Moreover, the device
Organic exhaust gas is handled using dual firing chamber, increases system energy consumption and overall cost of disposal.
A kind of contaminated soil heat of the Invention Announce of Patent No. CN104307865A drives desorption repair system and method, with
The waste heats such as high-temperature flue gas, high temperature air, high-temperature steam or high-temp liquid are heat source, carry out contaminated soil remediation using indirect heating
Process.The shortcoming of the method is that the device is necessarily mounted near the equipment for generating such heat source, if the equipment distance
Farther out, contaminated soil freight increases contaminated site, improves processing cost, less economical.
The contaminated soil thermal desorption reparation system that a kind of waste heat of the Invention Announce of Patent No. CN105080957A recycles
System, using surface-type heat-exchange device, helps combustion air to preheat room temperature the high-temperature tail gas generated in repair process
Processing is not carried out the thorough degradation of pollutant, only realizes pollutant since vent gas treatment process uses activated carbon adsorption
From gas phase to the transfer process of solid phase, become hazardous waste after activated carbon adsorption saturation, need to carry out secondary treatment, cost of disposal compared with
It is high.
A kind of thermal desorption method of Polluted Soil of the Invention Announce of Patent No. CN102218446A, the invention is by Polluted Soil
Thermal desorption is carried out at 400 DEG C~650 DEG C, desorption generates flue gas and carries out incineration disposal at 750 DEG C~1200 DEG C, i.e. increase energy
Consumption and cost of disposal, and have the risk for generating dioxin contamination.If thermal desorption device is using burning liquid natural gas, need
Build holding vessel.For safety grounds, a series of approval process is extremely complex；Moreover, in recent years due to national gas consumption
It increases, " gas is waste " phenomenon occur in some areas, cause for unsaturated vapor, it is possible to delay and administer the duration.
A kind of thermal desorption device of the Invention Announce of Patent No. CN105032913A, thermal desorption repair system and pollution
The thermal desorption method of soil, pollutant and moisture pass through indirect thermal desorption device heating evaporation after, by dust-extraction unit, directly into
Enter catalytic degradation unit.Moisture will have an adverse effect to the activity of catalyst, reduce catalytic degradation efficiency.
Patent No. CN105057337A discloses a kind of efficiently indirect thermal desorption device, and soil treatment unit includes charging
Bucket, charging flapper, outer cylinder, discharging flapper, motor, burner and chimney composition.Contaminated soil enters outer cylinder and burning
Mobile to left end in the rotation of shaftless auger in space between pipe, in the process, contaminated soil is constantly heated, is dry
Dry, moisture and organic pollutant form steam and enter exhaust treatment system.The shortcoming of the method is filled using shaftless auger
It sets, is not only prone to wear in the process of running, but also limit the disposing capacity of its own.
The direct or indirect thermal desorption system of above organic polluted soil and method are examined safely when there are natural gases as fuel
Give an written reply miscellaneous, single-stage thermal desorption system is heated unnecessarily moisture to cause energy waste, and pollutant is not thorough after desorption
The problems such as degradation removal, there are secondary pollution risks, needs to be optimized system design, improves efficiency of energy utilization.
Summary of the invention
The purpose of the present invention is to solve the above-mentioned problems of the prior art, and then it is de- to provide a kind of classification indirect thermal
Attached coupling and catalyzing is degraded the system and method for repairing organic polluted soil.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of indirect thermal desorption coupling and catalyzing degradation repair system of contaminated soil classification, comprising: soil digs fortune and temporary vehicle
Between, soil pretreatment system, charging metering system, low temperature thermal desorption kiln, condenser, Sewage Disposal, bag filter A,
High temperature thermal desorption kiln, cyclone dust collectors, discharging device, soil moistening and lowering temperature device, soil workshop to be checked, catalytic degradation list
Member, charcoal canister, bag filter B, extracting tower, air-introduced machine, chimney, electrical control system and electric energy feedway；Its feature
Be, charging metering system outlet is connected with low temperature thermal desorption kiln entrance, low temperature thermal desorption kiln export respectively with
High temperature thermal desorption kiln entrance is connected with condenser inlet, condensator outlet respectively with Sewage Disposal and bag filter A
Entrance is connected, and the outlet of high temperature thermal desorption kiln is connected with discharging device and cyclone dust collectors entrance respectively, bag filter A
Outlet and cyclone entrance are connected with catalytic degradation unit entrance respectively, the outlet of catalytic degradation unit and bag filter
B entrance is connected, and charcoal canister outlet is connected with gas path pipe, and the outlet bag filter B is connected with extracting tower entrance, takes off
Acid tower outlet is connected with air-introduced machine, and the outlet of air-introduced machine is connected with chimney.
Further, the low temperature thermal desorption kiln and high temperature thermal desorption kiln are indirect thermal desorption device, and are
Jacket type structure, including outer cylinder and inner cylinder, high-temperature-resistant thermal-insulation cotton are covered on the inner surface of outer cylinder, and heat tape is ordered in guarantor
Warm cotton surface, inner cylinder are rotary kiln form in internal rotating, guarantee contaminated soil thermally equivalent.
Further, the heating element of the indirect thermal desorption device is nichrome heat tape, the nichrome
Heat tape is Cr20Ni80 resistance heating bandlet, and the power density of heat tape is 1W/cm2, 1400 DEG C of maximum operation (service) temperature；
The general power of low temperature and high-temperature indirect heating furnace is 360kW, and each point 3 groups, 120kW/ group, power sources in parallel connects between different groups
It connects.
Further, the outer cylinder furnace body of the low temperature thermal desorption kiln and high temperature thermal desorption kiln is 310S stainless steel,
Inner cylinder furnace body is 316L stainless steel.
Further, the low temperature thermal desorption kiln axis angle with horizontal plane is in 5-10 °, high temperature thermal desorption kiln axis
Angle with horizontal plane is in 0 ° of setting.
Further, the condenser selects corrugated tube heat exchanger, tail gas after condensation, temperature be reduced to 40 DEG C with
Under.
Further, be multi-compartment bed laminar reaction environment inside the catalytic degradation unit, in the pipeline of multi-stage U-shaped into
Row, catalytic reactor inside is catalyst module box, and the honeycombed catalyst of cuboid-type is placed in catalyst module box.
Further, the catalyst uses transition metal oxide type catalyst V2O5-WO3/TiO2, reaction temperature is
350 DEG C, remove in tail gas 99% or more benzene homologues or polycyclic aromatic hydrocarbon organic pollutant.
Further, soil moisture content after moistening and lowering temperature device is between 5%-15%.
A kind of indirect thermal desorption coupling and catalyzing degradation restorative procedure of contaminated soil classification, which is characterized in that use above-mentioned dirt
Contaminate the indirect thermal desorption coupling and catalyzing degradation repair system of land classification, comprising the following steps:
Step 1: being powered on, inside low temperature thermal desorption kiln and high temperature thermal desorption kiln by electrical control system
Heat tape converts electrical energy into thermal energy, when two thermal desorption devices respectively reach set temperature, opens air-introduced machine；
Step 2: contaminated soil is screened, broken, adjusting moisture content, except after iron pretreatment operation, Polluted Soil partial size is less than
30mm, moisture content initially enter low temperature thermal desorption kiln less than 20%, by feeding metering system, the moisture contained in soil and
The lower organic pollutant of boiling point, which is heated indirectly, to be evaporated, and enters in tail gas；Meanwhile the contaminated soil after desiccation from
The outlet of low temperature thermal desorption kiln drops down onto high temperature thermal desorption kiln entrance；
Step 3: initially entering condenser from the tail gas that low temperature thermal desorption kiln comes out, condenser is bellows-type heat exchange
Device, pipe internal flow cooling water, tail gas flow outside pipe, and the vapor and boiling point in tail gas are higher than 40 DEG C of organic pollutant quilt
It condenses out, after mixed collection, is transported to Sewage Disposal and is handled；
Step 4: the tail gas after condensation, further uses bag filter, dust present in tail gas is carried out
Filtration, purification；The tail gas come out from bag filter still contains the organic pollutant that a small amount of boiling point is lower than 40 DEG C, by this strand of air-flow
The tail gas mixing for leading to the entrance of catalytic degradation unit and the higher temperature of high temperature thermal desorption kiln outflow, after increasing temperature, stream
Enter catalytic degradation unit；Cellular V is installed in catalytic degradation unit2O5-WO3/TiO2Catalyst, by dirt organic in tail gas
Contaminate object catalytic decomposition；
Step 5: catalytic degradation unit outflow tail gas further use active carbon injection coupling bag-type dust it is cleaned
Journey realizes the thorough removing of organic pollutant, meanwhile, to the dust process for re-filtering in tail gas, further strengthen dirty
Contaminate the purification process of object；
Step 6: being the negative pressure that whole system provides by air-introduced machine, tail gas further flow to extracting tower, sprays by top
The lye neutralization penetrated, completes the subtractive process of sour gas；Through the qualified tail gas of processing, directed to chimney, realization reaches
Mark discharge；
Step 7: high temperature thermal desorption treated soil is by discharging device, the humidified drop again in moistening and lowering temperature device
Warm process is transported to soil field to be checked.
In the method that the indirect thermal desorption coupling and catalyzing of above-mentioned classification degrades repairing organic polluted soil, organic pollution
Soil, by digging fortune, is transferred to soil pretreatment workshop and is kept in windowfree workshop.Contaminated soil is successively by broken, sieve
Divide, adjust moisture content and except preprocessing process such as iron, low temperature thermal desorption kiln is delivered to by belt weigher.The kiln is indirect
Heating type, and be jacket type structure (being divided into outer cylinder and inner cylinder), high-temperature-resistant thermal-insulation cotton is covered on the inner surface of outer cylinder, electric heating
Band is ordered in heat-preservation cotton surface, is converted into thermal energy by the electric energy for conveying electric energy supply arrangement, provides thermal desorption process
Required energy.Heat by the hole transmission between interior outer furnace tube, design in hole distance between outer furnace tube for 15~
25cm.The inner wall of inner cylinder is equipped with the helical blade at certain inclination angle, and contaminated soil is in inner cylinder by helical blade with inner cylinder
It rotary advanced movement and is heated, another effect of helical blade is the heat transfer area for increasing inner tube wall, enhanced heat exchange.Control
Low temperature thermal desorption kiln is unearthed temperature at 105 DEG C or so, and low temperature thermal desorption kiln mainly realizes lower boiling contaminants and moisture
Subtractive process, prevent this part vapor from flowing into subsequent high temperature thermal desorption kiln and because being heated at high temperature cause unnecessary energy
Measure loss process.The tail gas come out from low temperature thermal desorption kiln initially enters condenser, and condenser is corrugated-tube type heat exchanger, pipe
Internal flow cooling water, the organic pollutant of vapor and boiling point higher than 40 DEG C in tail gas is condensed, after mixed collection,
Sewage Disposal is transported to be handled.By the tail gas after condensation, bag filter is further used, to existing in tail gas
Dust be filtered purification.The tail gas come out from bag filter may still be lower than 40 DEG C of organic contamination containing a small amount of boiling point
Object mixes the tail gas that this strand of air-flow leads to the entrance of catalytic degradation system and the higher temperature of high temperature thermal desorption kiln outflow,
After increasing temperature, catalytic degradation process is completed in catalytic degradation system, resolves into water, carbon dioxide and hydrogen chloride etc..
The soil come out from low temperature thermal desorption kiln, automatically falls into high temperature thermal desorption kiln.The device is still de- for indirect thermal
Adsorption device, and be jacket type structure (being divided into outer cylinder and inner cylinder), high-temperature-resistant thermal-insulation cotton is covered on the inner surface of outer cylinder, heat tape
It is ordered in heat-preservation cotton surface, the electric energy conveyed by electric energy feedway provides energy required for thermal desorption process.It is dirty
Dye soil with the rotary advanced movement of inner cylinder and is heated in inner cylinder, and control high temperature thermal desorption is unearthed temperature on 300 DEG C of left sides
The right side, to guarantee that the higher boiling organic pollutant contained in contaminated soil realizes thoroughly desorption.Contaminated soil starting is heated to 105 DEG C
When, since itself humidity is big, dust yield is smaller, so in low temperature thermal desorption kiln exit and not set cyclone dust removal
Device, and after the high-temperature heating process of high temperature thermal desorption kiln, contaminated soil becomes loose, it is more likely that generates more powder
Therefore cyclone dust collectors are arranged after high temperature thermal desorption kiln in dirt, carry out purification process to dust.After cyclonic separation
Tail gas contains higher boiling organic pollutant, by the low boiling point organic pollutant in the tail gas come out together with bag filter A, together
Flow into catalytic degradation unit.It is mounted with cellular preformed catalyst in catalytic degradation unit, is used for organic pollutant degradation
For carbon dioxide, water and hydrogen chloride.To prevent a small amount of organic pollutant from realizing thoroughly degradation not in catalytic degradation unit, cause
Pollutant discharge beyond standards, the tail gas of catalytic degradation unit outflow further uses active carbon injection coupling bag-type dust process, real
The thorough removing of existing pollutant, meanwhile, filter process is realized to the dust in tail gas.It is what whole system provided by air-introduced machine
Negative pressure, tail gas further flow to extracting tower, complete the subtractive process of sour gas.Through the qualified tail gas of processing, directed to cigarette
Chimney realizes qualified discharge.Meanwhile high temperature thermal desorption treated soil humidified temperature-fall period again, it is transported to soil field to be checked,
Etc. the course of receiving to be detected.
After pretreatment due to soil, moisture content is relatively high, therefore, low temperature thermal desorption kiln axis and horizontal plane is arranged
Angle is in 5-10 °, is conducive to movement of the soil in inner cylinder；And high temperature thermal desorption kiln axis angle with horizontal plane is set and is in
0 °, in order to extend heated time of the soil in high temperature thermal desorption kiln, so that thermal desorption process is more abundant, it is ensured that
It is unearthed up to standard.Meanwhile the setting of 0 ° of angle is also beneficial to keep the stabilization in equipment running process, reduces equipment attrition, reduces
Operation and maintenance cost and cost.
Beneficial effects of the present invention:
1, liquefied natural gas or fuel oil are replaced with electric energy
If the fuel of thermal desorption device is using liquefied natural gas or fuel oil, need to build interim natural gas or fuel oil storage
Deposit tank.However, local government, for safety grounds, a series of approval process is extremely complex.Moreover, in recent years since the whole nation is used
There is " gas is waste " phenomenon in the increasing of tolerance, some areas.If natural gas will be burnt, it is changed to using electric energy, is thermal desorption
Device provides heat, will there is following advantage:
(1) electric energy is a kind of energy of clean and environmental protection the most, and the process for providing energy not will increase vent gas treatment burden；And
And energy source is more extensive, safety, economy；It is production, easy to use, will not be because of the whole nation " gas waste " the problems such as, occur energizing not
Foot；In addition, electric energy can effectively improve efficiency of energy utilization, energy waste is reduced.Industrial Stoves efficiency is 40% or so, electrical kiln
The efficiency of furnace is up to 70%-80%.
(2) electric energy is used, without installation burner, thermal desorption equipment becomes more succinct.Moreover, because not needing to be arranged
The removableization degree of special liquefied gas station or fuel oil station, complete equipment is higher.
(3) due to using liquefied natural gas or fuel oil etc., there is very big security risk, so needing many examination & approval.It compares
In burning natural gas, it can be much less safety examination & approval link using electric energy, be more advantageous to the implementation of smoothly honouring an agreement of engineering project.
In conclusion electricity consumption will be changed to gas, front end Soil Thermal desorption process is carried out, there is great practical value and work
Cheng Yiyi.
2, indirect thermal desorption processes are classified
Low temperature thermal desorption kiln and high temperature thermal desorption kiln is arranged in this set equipment, realizes the progressive solution to contaminated soil.
By the calorific value of heat tape in control kiln, the temperature inside kiln is controlled.Low temperature thermal desorption kiln mainly realizes pollution
The drying process of soil reduces the moisture content in soil, avoids moisture in the follow-up process because being heated at high temperature, and causing need not
The energy loss wanted.High temperature thermal desorption kiln realizes thorough desorption process of the boiling point compared with high pollution object, realizes the reparation of soil
Thoroughly administer.
In addition, low temperature thermal desorption kiln and high temperature thermal desorption kiln are all made of indirect heating and are that jacket type structure (divides
For outer cylinder and inner cylinder) form, i.e. heat tape provides heat by converting electrical energy into thermal energy for thermal desorption process, meanwhile,
Heat inner tank theca.And inner cylinder is then rotary kiln form, and soil is driven to absorb outside heat in inner rotation, so that soil temperature
Degree increases, and accelerates thermal desorption process.Compared to the form that directly heats, indirect heating substantially reduces tail gas amount, reduces tail gas clean-up
Load, advantageously reduce the operating cost of complete equipment.
3, the advantage of catalytic degradation
Traditional thermal desorption processing unit only realizes the transfer of pollutant by the way of activated carbon adsorption pollutant,
And pollutant is not implemented and degrades in the exhaustive oxidation of repair process；And in such a way that removal organic matter is burnt in dual firing chamber, then it needs
Mass energy is consumed, unnecessary energy dissipation is caused.
Catalytic degradation technology is degraded because being able to achieve the exhaustive oxidation of organic pollutant, is considered a kind of most potential control
Technology.Catalyzing oxidizing degrading method has many advantages, such as that reaction temperature is low, and energy consumption is small, it can be achieved that exhaustive oxidation degradation, has obtained more next
The concern of more researchers.
For the present invention by the way of catalysis burning, catalyst uses transition metal oxide type catalyst V2O5-WO3/
TiO2, which belongs to the transition metal oxide that price is lower, active higher and strong anti-poisoning capability, has been widely used for
Catalytic degradation organic pollutant.350 DEG C of the catalyst optimal reaction temperature can preferably remove benzene homologues in tail gas, more
The organic pollutants such as cycloaromatics, total removal rate can be 99% or more.Modularization and standardization level are high, are easy to use and transport,
Cost of investment is reduced with the design of more compact structure.
4, the impacted risk of catalyst is reduced
Soil moisture is become vapor by low temperature thermal desorption kiln, and then is condensed out within the condenser.Meanwhile low temperature
The tail gas that thermal desorption kiln and high temperature thermal desorption kiln come out takes dust suppression before entering catalytic degradation unit, reduces
Dust content in tail gas.Moreover, indirect thermal desorption process, smaller to disturbing during soil movement, so that dust contains in tail gas
It measures lower, compared to direct thermal desorption process, reduces the blocking to catalyst.Above by moisture content and powder in reduction tail gas
Phenomena such as moisture and the dust adverse effect caused by catalyst can be effectively reduced in the measure of dust content, avoids blocking is caused
The case where catalytic degradation efficiency reduces, extends the service life of catalyst.
Detailed description of the invention
Fig. 1 is that a kind of contaminated soil is classified indirect thermal desorption coupling and catalyzing degradation prosthetic device schematic diagram, wherein solid line generation
Table solid phase stream, short-term dotted line represent gas phase stream, and pecked line represents liquid phase stream, and short-term and the alternate dotted line of point represent circuit control.
Appended drawing reference in figure:
1- soil digs fortune and temporary workshop, 2- soil pretreatment structure, and 3- feeds measurement structure, 4- low temperature thermal desorption kiln
Furnace, 5- condenser, 6- Sewage Disposal, the first bag filter of 7-, 8- high temperature thermal desorption kiln, 9- cyclone dust collectors, 10- go out
Expect structure, 11- soil moistening and lowering temperature structure, the workshop to be checked 12-, 13- catalytic degradation structure, 14- charcoal canister, the second cloth of 15-
Bag dust collector, 16- extracting tower, 17- air-introduced machine, 18- chimney, 19- electrical control system, 20- electric energy feed system.
Specific embodiment
Below in conjunction with attached drawing, the present invention is described in further detail: the present embodiment is being with technical solution of the present invention
Under the premise of implemented, give detailed embodiment, but protection scope of the present invention is not limited to following embodiments.
As shown in Figure 1, a kind of indirect thermal desorption coupling and catalyzing degradation repairing polluted soil of classification involved in the present embodiment
System, comprising: soil dig fortune and temporary workshop 1, soil pretreatment system 2, charging metering system 3, low temperature thermal desorption kiln
4, condenser 5, Sewage Disposal 6, bag filter A7, high temperature thermal desorption kiln 8, cyclone dust collectors 9, discharging device 10, soil
Earth moistening and lowering temperature device 11, soil workshop 12 to be checked, catalytic degradation unit 13, charcoal canister 14, bag filter B15, depickling
Tower 16, air-introduced machine 17, chimney 18, electrical control system 19 and electric energy feedway 20.The charging metering system 3 outlet with it is low
Warm desorption 4 entrance of kiln be connected, low temperature thermal desorption kiln 4 outlet respectively with 8 entrance of high temperature thermal desorption kiln and condenser 5
Entrance is connected, and the outlet of condenser 5 is connected with Sewage Disposal 6 and bag filter A7 entrance respectively, high temperature thermal desorption kiln
The outlet of furnace 8 is connected with discharging device 10 and 9 entrance of cyclone dust collectors respectively, the outlet bag filter A7 and cyclone dust collectors 9
Outlet is connected with 13 entrance of catalytic degradation unit respectively, and the outlet of catalytic degradation unit 13 is connected with bag filter B15 entrance
Logical, the outlet of charcoal canister 14 is connected with gas path pipe, and the outlet bag filter B15 is connected with 16 entrance of extracting tower, depickling
The outlet of tower 16 is connected with air-introduced machine 17, and the outlet of air-introduced machine 17 is connected with chimney 18.
The condenser 5 is corrugated-tube type heat exchanger.Between the low temperature thermal desorption kiln and high temperature thermal desorption kiln are
Connect thermal desorption kiln.
A kind of indirect thermal desorption coupling and catalyzing involved in the present embodiment is degraded the method for repairing organic polluted soil, respectively
Shown in part operation is described below.
1, contaminated soil digs fortune and keeps in
With it is light, in, serious pollution region carry out contaminated soil excavation respectively, carried out in windowfree workshop.After clear digging
Contaminated soil is transported to temporary workshop, first between temporary in drained, air-dry dehydration, avoid excessive moisture from imitating thermal desorption
The influence of rate.Bottom is poured using cement between temporary, and centre is laid with antiseepage film, and rubble is laid at the top of cement surface as filtering layer.
2, contaminated soil pretreatment system
Pretreatment workshop can prevent pollutant volatilization and contaminated soil from entering atmosphere in a manner of dust, entire pretreated
Cheng Jun is carried out in pretreatment workshop, and exhaust gas processing device is arranged in pretreatment workshop, and using negative pressure mode, tail gas is through bag-type dust
And activated carbon adsorption processing rear discharge up to standard, prevent dust and volatile contaminant from entering ambient atmosphere environment.
Contaminated soil pretreatment stage mainly includes screening, broken, adjusting moisture content, except iron.Contaminated soil pretreatment exists
It carries out in windowfree workshop, contaminated soil is sieved using screening machine, the ultra-specification soil block (partial size is greater than 50mm) after screening,
It is crushed using crusher, to reduce the granularity of soil, to reduce the heat transfer in subsequent processes, resistance to mass tranfer, is mentioned
High treatment efficiency.Soil is sieved again after crushing, so that thermal desorption process is heated evenly, while improving heating efficiency.
The higher clay of moisture content is such as encountered, to add a certain proportion of reparation medicament by pretreatment stage before thermal desorption is disposed, it is described
Repairing medicament is the medicaments such as calcium oxide, on the one hand can reduce the moisture content in contaminated soil (or bed mud), is stirred convenient for the later period
Processing, on the other hand can make soil looser, be conducive to enhance the diabatic process in rotary kiln, to reduce disposal process
Energy consumption.The ferrous metal in contaminated soil is removed using ferromagnetic optional equipment is removed, to avoid ferrous metal in thermal desorption kiln
Middle melting is simultaneously attached on inner wall, is influenced its capacity of heat transmission and is seriously reduced kiln service life.
3, metering system is fed
The charging metering system includes closed charging belt and positioned at the charging belt feed end and to pretreated
Contaminated soil after weighing is delivered to low temperature indirect thermal desorption kiln by the measuring belt scale that contaminated soil is weighed, the charging belt
Furnace entrance.
4, indirect thermal desorption kiln
Low temperature thermal desorption kiln is similar with high temperature thermal desorption furnace construction, need to only control the temperature inside kiln body and realize difference
The heating process of temperature range.Indirect thermal desorption kiln is mainly by portions such as outer cylinder, furnace lining, heat tape, inner cylinder and helical blades
Part composition, electric heating furnace body divide three sections of left, center, right composition, and general power 360kW, every section of power is 120kW.
(1) furnace shell structure: due to inner cylinder furnace body and contaminated soil Long Term Contact, it is necessary to enhance its corrosion resistance, institute
The outer cylinder furnace body for stating low temperature thermal desorption kiln and high temperature thermal desorption kiln is 310S stainless steel, and inner cylinder furnace body is 316L stainless
Steel, since furnace body is larger, furnace shell steel plate is rolled using 8mm stainless steel plate, and intensity is high, and integral rigidity is good, fully takes into account
The problems such as stove integral strength, frame structure downwarp, deformation.Use stainless steel supporting block and outer furnace shell fixed to improve furnace lining knot
Structure intensity.
(2) furnace lining structure: furnace lining is filled using ceramic fiber cotton, is kept the temperature using ceramic fiber cotton.It is ceramic fine
Vinylon and cotton blend plate is made of several pieces of cellucotton modules, between using ceramics nail and other attachmentes fix.Ceramics nail carries out surface office
Portion's glaze spraying processing, reaches good insulation performance.Skin temperature reaches code requirement: according to GB/T 8175-2008 " equipment and
Pipe insulation design " directive/guide regulation, insulating layer hull-skin temperature is no more than 60 DEG C.
(3) type selecting of thermo electric material: high resistance high temperature-resistant electrothermal alloy resistance band is used, by nichrome (Cr20Ni80)
" u "-shaped back and forth up and down is made, the inner surface of furnace lining structure is separately mounted to threaded ceramics nail, heated condition is stablized.With
Conventional helical shape resistance wire, which is compared, can be improved the thermal efficiency about 15%.According to the heat consumption situation in furnace to the reasonable cloth of heating element
It sets, heating surface product is big, and radiance is high, and heat transmission resistance is small.
The heating element of indirect thermal desorption kiln is resistance alloys heat tape, and the power density of heat tape is 1W/
cm2, the general power of indirect heating kiln is 360kW, divides 3 groups, 120kW/ group.
(4) heat tape and draw the crimping of bar: first curving heat tape back and forth U-shaped, be inlaid in special with recessed
In the ceramics nail of slot, since ceramics nail is handled by the glaze spraying of surface part, it is difficult and thermal insulation material after ceramics are followed closely and absorb moisture
Circuit is constituted, just improves the insulation resistance of heat tape to a certain extent, in addition, slot in the centre for drawing bar, it will
Heat tape is inlaid in slot, then by bolt by heat tape with draw bar and effectively reliably link together, even if electric heating
Band is also not easy to break due to thermal expansion.
(5) each indirect thermal desorption kiln temperature measuring point: is arranged in 12 0-1200 DEG C of K Graduation Number thermocouple
Between inner barrel and outer barrel, the temperature between inner barrel and outer barrel for monitoring indirect thermal desorption kiln prevents over temperature and heat phenomenon,
Every section of indirect thermal desorption kiln sets 4 thermocouples.
5, condenser
Condenser selects corrugated-tube type heat exchanger, which is application on the basis of traditional tubular heat exchanger
The design of enhanced heat transfer theory and the unique peaks and troughs of heat exchanger tube makes the performance of heat exchanger realize important breakthrough.It is inherited
The advantages that tubular heat exchanger is firm, durable, safe and reliable, while the spies such as poor, the easy fouling of its exchange capability of heat are overcome again
Point.
The tail gas come out from low temperature thermal desorption kiln is pipelined to condenser, and tail gas is entered by condenser air inlet
Corrugated-tube type heat exchanger, gas outlet go out heat exchanger；The trend of cooling water is opposite with tail gas trend；The setting of condensation water collection mouth is being changed
The bottom of hot device, and there is pipeline to link together with condensation water treatment unit.For tail gas after heat exchanger, temperature can be reduced to 40
DEG C hereinafter, vapor and boiling point in tail gas between 40-105 DEG C organic matter (such as 1,1- dichloroethanes, chloroform and benzene etc.) quilt
Be cooled to liquid, with ensure through in supercooling rear molding gas water content and content of organics it is sufficiently low, reduce to the shadow of catalyst
It rings, mitigates the load of subsequent tail gas treating unit.
6, Sewage Disposal
The condensate liquid generated after condenser carries out water-oil separating and water treatment procedure in Sewage Disposal.The dirt
Water treatment station includes oil water separator, water treatment facilities, oil storage tank and water tank.The oil water separator be used for organic phase and
Aqueous phase separation, isolated organic phase pollutant are stored in oil storage tank, and isolated water phase enters water treatment facilities.The water process
Device is purified and is handled to the water phase after water-oil separating, and water a part that treated is used for condenser and soil moistening and lowering temperature
The process water of device, a part are stored in water tank.
7, catalytic degradation unit
The present invention relates to a kind of VOCs and SVOCs catalytic degradation units, belong to tail gas clean-up processing equipment field, including tail
Gas import, catalytic reactor and thermal insulation material, catalyst, offgas outlet.Wherein, inside reactor is hollow structure, and both ends are pre-
Stay the inlet and outlet being open as tail gas.To reach better degradation effect, multistage bed formula reaction environment is devised, in multistage
It is carried out in U-shaped pipeline.It is catalyst module box inside catalytic reactor, the catalyst of cuboid-type is placed on catalyst module
In box.Catalytic reactor outer surface coating ceramic cellucotton thermal insulation material reduces internal heat and scatters and disappears.Catalytic degradation unit uses
Modularized design can be quickly installed and dismantle, have mobility, can be used for different regions contaminated site recovery project, full
Sufficient equipment fast transfer, the demand for being readily transported, being used continuously.
For the present invention by the way of catalysis burning, catalyst uses transition metal oxide type catalyst V2O5-WO3/
TiO2, which belongs to the transition metal oxide that price is lower, active higher and strong anti-poisoning capability, has been widely used for
Catalytic degradation organic pollutant.350 DEG C of the catalyst optimal reaction temperature can preferably remove benzene homologues in tail gas, more
The organic pollutants such as cycloaromatics, total removal rate can be 99% or more.
8, discharging device
The purified clean soil of the present invention uses high-temperature closed conveying equipment, if bucket conveyor discharges, so that it is guaranteed that
The negative pressure state of thermal desorption process.
9, soil moistening and lowering temperature device
Pass through water spray in the device by the moistening and lowering temperature device of inlet from the soil of discharging device outlet discharge
Mixing, makes the higher hometown earth of temperature sufficiently exchange heat with cooling water, so that the soil moisture is reduced, so that it becomes moisture content is
The cleaning soil of 5%-15%.
10, charcoal canister
In order to prevent when handling high concentration organic polluted soil, the treatment effeciency of catalytic degradation unit declines, and leads to portion
Divide the risk of the unprocessed just emptying of organic pollutant.Therefore, it specially installs charcoal canister additional, sprays active carbon powder, adsorb tail
Organic pollutant in gas forms combined system with bag filter.When handling high concentration organic polluted soil, active carbon is main
For adsorbing the organic compound without the degradation of catalytic degradation unit complete oxidation, it is ensured that exhaust emissions is up to standard.
11, bag filter
Flue gas after catalytic degradation unit enters pulsed sack cleaner, by dust particles contained in flue gas
It is enriched on filter cloth, is collected fine grained stripping to the lower exit port on filter cloth by air compressor machine.Bag filter sets winged
Grey bunker for collecting and unloading valve, using closed spiral ash discharge conveying equipment, by fly ash carry to dedicated ash collecting device
It is cooled down, flying dust after cooling is transported to workshop to be checked and carries out examination to be checked.If pollutant concentration is more than to repair in flying dust
Target value is then transported supreme warm desorption kiln back, is disposed again；If pollutant concentration acceptance(check) in flying dust, and repair
Clean soil after multiple backfills together.
12, extracting tower
After flue gas leaves bag filter, into extracting tower, exhaust gas comes into full contact with lye progress gas-liquid two-phase to react, in
With the acidic materials in flue gas.
13, air-introduced machine and chimney
Under the action of air-introduced machine, tail gas is drained into atmosphere by extracting tower by chimney.It is real equipped with flue gas on chimney
When on-Line Monitor Device, can be continuously monitored through the pollution such as carbon monoxide, sulfur dioxide, nitrogen oxides in the flue gas of monitoring point
The concentration of substance, assist operators monitor exhaust emissions concentration in real time, and purified gas meets " atmosphere pollution comprehensive discharge
Standard " (GB 1621), it is ensured that harmful constituent and dust etc. reach discharge standard in tail gas.
14, electric energy feedway
Electric energy feedway mainly includes power supply, cable and digital display voltameter.Power supply is to provide for heat tape heating
Required electric energy, required input power is depending on pedological unit disposition amount and the heating temperature of setting, using 380V AC power source,
Frequency 50Hz, three-phase electricity.Cable is then used to power on and heat tape, and the electric energy in power supply is led to heat tape and generates heat
Amount.
15, electrical control system
Electrical control system realizes circuit control, protection and the power regulation of entire thermal desorption system, all devices in this part
Part will be integrated in several Electric Appliance Cabinets.
Electrical control system should include at least following device at present: miniature circuit breaker, contactor, controllable silicon power regulator, in
Between relay, temp controlled meter and master control table, button, indicator light, digital display voltameter, Switching Power Supply and cabinet shell etc..
Miniature circuit breaker is made of operating mechanism, contact, protective device (various buckle releasers), arc quenching system etc., for preventing
Only short circuit or heavy overload occur for circuit.Contactor is to be connect by controlling the on-off connect in the auxiliary contact of control circuit to control
Reach the requirement of control circuit in the on-off of the main contacts of main circuit.Intermediate relay is for relay protection and automatically controls system
In system, to increase the quantity and capacity of contact.Controllable silicon power regulator be it is a kind of with silicon-controlled (power electronic power device) for base
Plinth controls electric appliance by the power of core of intelligent digital control circuit, and abbreviation controllable silicon power regulator has high-efficient, nothing
Mechanical noise and abrasion, fast response time, it is small in size, light-weight many advantages, such as.Main function is: " thyristor power regulating eqiupment " is logical
The accurate control to voltage, electric current and power is crossed, to realize precise temperature control.And rely on its advanced digital control algorithm,
Electric energy service efficiency is optimized, has played important function to electric energy is saved.
A kind of method being classified indirect thermal desorption coupling and catalyzing degradation repairing polluted soil involved in the present embodiment, including
Following steps:
One, by electrical control system, power on, the electricity inside low temperature thermal desorption kiln and high temperature thermal desorption kiln adds
The torrid zone converts electrical energy into thermal energy, when two thermal desorption devices respectively reach set temperature, opens air-introduced machine.
Two, contaminated soil is screened, broken, adjusting moisture content, (Polluted Soil partial size is less than 30mm, and moisture content is less than 20%)
With except initially entering low temperature thermal desorption kiln by feeding metering system after the pretreatment operations such as iron, the moisture contained in soil with
The lower organic pollutant of boiling point, which is heated indirectly, to be evaporated, and enters in tail gas.Meanwhile the contaminated soil after desiccation from
The outlet of low temperature thermal desorption kiln drops down onto high temperature thermal desorption kiln entrance.
Three, condenser is initially entered from the tail gas that low temperature thermal desorption kiln comes out, condenser is corrugated-tube type heat exchanger, pipe
Internal flow cooling water, tail gas flow outside pipe, and organic pollutant of the vapor and boiling point in tail gas higher than 40 DEG C is condensed
Get off, after mixed collection, is transported to Sewage Disposal and is handled.
Four, the tail gas after condensation, further uses bag filter, is filtered to dust present in tail gas
Purification.The tail gas come out from bag filter may still be lower than 40 DEG C of organic pollutant containing a small amount of boiling point, by this strand of air-flow
The tail gas mixing for leading to the entrance of catalytic degradation unit and the higher temperature of high temperature thermal desorption kiln outflow, after increasing temperature, stream
Enter catalytic degradation unit.Cellular V is mounted in catalytic degradation unit2O5-WO3/TiO2Catalyst, can will be organic in tail gas
Pollutant resolves into water, carbon dioxide and hydrogen chloride etc..
Five, the tail gas of catalytic degradation unit outflow further uses active carbon injection coupling bag-type dust purification process, real
The thorough removing of existing organic pollutant, meanwhile, to the dust process for re-filtering in tail gas, further strengthen pollutant
Purification process.
Six, the negative pressure provided by air-introduced machine for whole system, tail gas further flow to extracting tower, by top jet
The subtractive process of sour gas is completed in lye neutralization.Through the qualified tail gas of processing, is directed to chimney, realize row up to standard
It puts.
Seven, high temperature thermal desorption treated soil is humidified again in moistening and lowering temperature device to cool down by discharging device
Journey is transported to soil field to be checked, waits the course of receiving to be detected.
In step 2, the outer cylinder furnace body of the low temperature thermal desorption kiln and high temperature thermal desorption kiln is 310S stainless steel,
Inner cylinder furnace body is 316L stainless steel.
In step 4, the V2O5-WO3/TiO2The content of vanadium of catalyst is 5wt.%, W content 10wt.%.
In step 7, by the way of water cooling, control spray cooling after clean soil in moisture content 5%~15% it
Between.
Working principle:
Contaminated soil is transferred to soil pretreatment workshop and is kept in, wait dystopy treatment process by digging fortune.Polluted Soil
Earth successively by broken, screening, adjusting moisture content and except preprocessing process such as iron, is delivered to low temperature thermal desorption by belt weigher
Kiln.The kiln is jacket type structure (being divided into outer cylinder and inner cylinder), and high-temperature-resistant thermal-insulation cotton is covered on the inner surface of outer cylinder, electric heating
Band is ordered in heat-preservation cotton surface, and the electric energy conveyed by electric energy feedway provides energy required for thermal desorption process.
Heat is transmitted by the hole between inside and outside furnace tube, and the hole distance designed between interior outer furnace tube is 15~25cm.Inner cylinder it is interior
Wall is equipped with the helical blade at certain inclination angle, contaminated soil in inner cylinder by helical blade with the rotary advanced movement of inner cylinder and
It is heated, another effect of helical blade is the heat transfer area for increasing inner tube wall, enhanced heat exchange.Low temperature thermal desorption is controlled to be unearthed
For temperature at 100 DEG C or so, low temperature thermal desorption kiln mainly realizes the subtractive process of lower boiling contaminants and moisture, prevents this portion
Divide vapor to flow into subsequent high temperature thermal desorption kiln and causes unnecessary energy loss process because being heated at high temperature.From Low Temperature Thermal
The tail gas that desorption kiln comes out initially enters condenser, and condenser is corrugated-tube type heat exchanger, pipe internal flow cooling water, tail gas
In vapor and boiling point be condensed higher than 40 DEG C of organic pollutant, after mixed collection, be transported to Sewage Disposal into
Row processing.By the tail gas after condensation, bag filter is further used, dust present in tail gas is filtered only
Change.The tail gas come out from bag filter may draw this strand of air-flow still there are also the organic pollutant that a small amount of boiling point is lower than 40 DEG C
The tail gas mixing of the higher temperature flowed out to the entrance and high temperature thermal desorption kiln of catalytic degradation unit is being urged after increasing temperature
Change in degradation unit and complete catalytic degradation process, resolves into the gases such as water, carbon dioxide and hydrogen chloride.
The soil come out from low temperature thermal desorption kiln, automatically falls into high temperature thermal desorption kiln.Contaminated soil in inner cylinder with
The rotary advanced movement of inner cylinder and be heated, control high temperature thermal desorption is unearthed temperature at 300 DEG C or so, to guarantee contaminated soil
The higher boiling organic pollutant inside contained realizes thoroughly desorption.When contaminated soil starting is heated to 100 DEG C, due to itself humidity
Greatly, dust yield is smaller, so in low temperature thermal desorption kiln exit and not set cyclone dust collectors, and it is de- to pass through high warm
After the high-temperature heating process of attached kiln, contaminated soil becomes loose, it is more likely that generates more dust, therefore, warms in height
Cyclone dust collectors are set after desorption kiln, purification process is carried out to dust.Tail gas after cyclonic separation, which contains higher boiling, to be had
Relatively low boiling point organic pollutant in the tail gas come out together with bag filter A is flowed into catalytic degradation list by machine pollutant together
Member.Cellular preformed catalyst is mounted in catalytic degradation unit, for by organic pollutant degradation be carbon dioxide, water and
Hydrogen chloride.To prevent pollutant from realizing thoroughly degradation not in catalytic degradation unit, object discharge beyond standards, catalytic degradation are polluted
The tail gas of unit outflow further uses active carbon injection coupling bag-type dust process, realizes the thorough removing of pollutant, meanwhile,
Filter process is realized to the dust in tail gas.It is the negative pressure that whole system provides by air-introduced machine, tail gas further flow to depickling
Tower completes the subtractive process of sour gas.Through the qualified tail gas of processing, is directed to chimney, realize qualified discharge.Meanwhile it is high
Warm desorption treated soil humidified temperature-fall period again, is transported to soil field to be checked, waits the course of receiving to be detected.
The foregoing is only a preferred embodiment of the present invention, these specific embodiments are all based on the present invention
Different implementations under general idea, and scope of protection of the present invention is not limited thereto, it is any to be familiar with the art
Technical staff in the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of, should all cover of the invention
Within protection scope.Therefore, the scope of protection of the invention shall be subject to the scope of protection specified in the patent claim.
Claims (10)
1. a kind of contaminated soil is classified indirect thermal desorption coupling and catalyzing degradation repair system, comprising: soil digs fortune and temporary workshop
(1), soil pretreatment system (2), charging metering system (3), low temperature thermal desorption kiln (4), condenser (5), Sewage Disposal
(6), bag filter A (7), high temperature thermal desorption kiln (8), cyclone dust collectors (9), discharging device (10), soil moistening and lowering temperature
Device (11), soil workshop to be checked (12), catalytic degradation unit (13), charcoal canister (14), bag filter B (15), depickling
Tower (16), air-introduced machine (17), chimney (18), electrical control system (19) and electric energy feedway (20)；It is characterized in that, described
Charging metering system (3) outlet is connected with low temperature thermal desorption kiln (4) entrance, low temperature thermal desorption kiln (4) export respectively with
High temperature thermal desorption kiln (8) entrance is connected with condenser (5) entrance, condenser (5) outlet respectively with Sewage Disposal (6) and
Bag filter A (7) entrance is connected, high temperature thermal desorption kiln (8) outlet respectively with discharging device (10) and cyclone dust collectors
(9) entrance is connected, bag filter A (7) outlet and cyclone dust collectors (9) export respectively with catalytic degradation unit (13) entrance
It is connected, catalytic degradation unit (13) outlet is connected with bag filter B (15) entrance, charcoal canister (14) outlet and gas circuit
Pipeline is connected, and the outlet bag filter B (15) is connected with extracting tower (16) entrance, extracting tower (16) outlet and air-introduced machine
(17) it is connected, the outlet of air-introduced machine (17) is connected with chimney (18).
2. contaminated soil according to claim 1 is classified indirect thermal desorption coupling and catalyzing degradation repair system, feature exists
In the low temperature thermal desorption kiln (4) and high temperature thermal desorption kiln (8) are indirect thermal desorption device, and are jacket type knot
Structure, including outer cylinder and inner cylinder, high-temperature-resistant thermal-insulation cotton are covered on the inner surface of outer cylinder, and heat tape is ordered in heat-preservation cotton table
Face, inner cylinder are rotary kiln form in internal rotating, guarantee contaminated soil thermally equivalent.
3. contaminated soil according to claim 2 is classified indirect thermal desorption coupling and catalyzing degradation repair system, feature exists
In the heating element of the indirect thermal desorption device is nichrome heat tape, and the nichrome heat tape is
Cr20Ni80 resistance heating bandlet, the power density of heat tape are 1W/cm2, 1400 DEG C of maximum operation (service) temperature；Low temperature and high temperature
The general power of indirect heater is 360kW, and each point 3 groups, 120kW/ group, power sources in parallel connection between different groups.
4. contaminated soil according to claim 3 is classified indirect thermal desorption coupling and catalyzing degradation repair system, feature exists
In the outer cylinder furnace body of the low temperature thermal desorption kiln (4) and high temperature thermal desorption kiln (8) is 310S stainless steel, inner cylinder furnace body
It is 316L stainless steel.
5. contaminated soil according to claim 4 is classified indirect thermal desorption coupling and catalyzing degradation repair system, feature exists
In low temperature thermal desorption kiln (4) the axis angle with horizontal plane is in 5-10 °, high temperature thermal desorption kiln (8) axis and horizontal plane
Angle is in 0 ° of setting.
6. contaminated soil according to claim 5 is classified indirect thermal desorption coupling and catalyzing degradation repair system, feature exists
In the condenser (5) selects corrugated tube heat exchanger, and for tail gas after condensation, temperature is reduced to 40 DEG C or less.
7. contaminated soil according to claim 6 is classified indirect thermal desorption coupling and catalyzing degradation repair system, feature exists
In the internal catalytic degradation unit (13) is multi-compartment bed laminar reaction environment, is carried out in the pipeline of multi-stage U-shaped, and catalysis is anti-
Answering is catalyst module box inside device, and the honeycombed catalyst of cuboid-type is placed in catalyst module box.
8. contaminated soil according to claim 7 is classified indirect thermal desorption coupling and catalyzing degradation repair system, feature exists
In the catalyst uses transition metal oxide type catalyst V2O5-WO3/TiO2, reaction temperature is 350 DEG C, removes tail gas
In 99% or more benzene homologues or polycyclic aromatic hydrocarbon organic pollutant.
9. contaminated soil according to claim 8 is classified indirect thermal desorption coupling and catalyzing degradation repair system, feature exists
In soil moisture content after moistening and lowering temperature device (11) is between 5%-15%.
10. a kind of contaminated soil is classified indirect thermal desorption coupling and catalyzing degradation restorative procedure, which is characterized in that use claim
Contaminated soil described in any one is classified indirect thermal desorption coupling and catalyzing degradation repair system in 1 to 9, comprising the following steps:
Step 1: being powered on, the electricity inside low temperature thermal desorption kiln and high temperature thermal desorption kiln adds by electrical control system
The torrid zone converts electrical energy into thermal energy, when two thermal desorption devices respectively reach set temperature, opens air-introduced machine；
Step 2: contaminated soil is screened, broken, adjusting moisture content, except after iron pretreatment operation, Polluted Soil partial size is less than
30mm, moisture content initially enter low temperature thermal desorption kiln less than 20%, by feeding metering system, the moisture contained in soil and
The lower organic pollutant of boiling point, which is heated indirectly, to be evaporated, and enters in tail gas；Meanwhile the contaminated soil after desiccation from
The outlet of low temperature thermal desorption kiln drops down onto high temperature thermal desorption kiln entrance；
Step 3: initially entering condenser from the tail gas that low temperature thermal desorption kiln comes out, condenser is corrugated-tube type heat exchanger, pipe
Internal flow cooling water, tail gas flow outside pipe, and organic pollutant of the vapor and boiling point in tail gas higher than 40 DEG C is condensed
Get off, after mixed collection, is transported to Sewage Disposal and is handled；
Step 4: the tail gas after condensation, further uses bag filter, is filtered to dust present in tail gas
Purification；The tail gas come out from bag filter still contains the organic pollutant that a small amount of boiling point is lower than 40 DEG C, this strand of air-flow is led to
The tail gas mixing of the higher temperature of entrance and high temperature thermal desorption the kiln outflow of catalytic degradation unit, after increasing temperature, inflow is urged
Change degradation unit；Cellular V is installed in catalytic degradation unit2O5-WO3/TiO2Catalyst, by organic pollutant in tail gas
Catalytic decomposition；
Step 5: the tail gas of catalytic degradation unit outflow further uses active carbon injection coupling bag-type dust purification process, it is real
The thorough removing of existing organic pollutant, meanwhile, to the dust process for re-filtering in tail gas, further strengthen pollutant
Purification process；
Step 6: being the negative pressure that whole system provides by air-introduced machine, tail gas further flow to extracting tower, by top jet
The subtractive process of sour gas is completed in lye neutralization；Through the qualified tail gas of processing, is directed to chimney, realize row up to standard
It puts；
Step 7: high temperature thermal desorption treated soil is by discharging device, it is humidified again in moistening and lowering temperature device to cool down
Journey is transported to soil field to be checked.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810779527.7A CN109078975A (en) | 2018-07-16 | 2018-07-16 | A kind of contaminated soil is classified indirect thermal desorption coupling and catalyzing degradation repair system and method |
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| CN201810779527.7A CN109078975A (en) | 2018-07-16 | 2018-07-16 | A kind of contaminated soil is classified indirect thermal desorption coupling and catalyzing degradation repair system and method |
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| CN110252792A (en) * | 2019-05-08 | 2019-09-20 | 苏州维诗环境技术工程有限公司 | A kind of combustion gas thermal desorption device in situ for soil remediation processing |
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| CN110369475A (en) * | 2019-07-17 | 2019-10-25 | 华东师范大学 | Quinolone antibiotics contaminated soil indirect thermal desorption processing method |
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| CN110314929A (en) * | 2019-07-17 | 2019-10-11 | 华东师范大学 | Sulfa antibiotics contaminated soil indirect thermal desorption processing method |
| CN110369475A (en) * | 2019-07-17 | 2019-10-25 | 华东师范大学 | Quinolone antibiotics contaminated soil indirect thermal desorption processing method |
| CN111112319A (en) * | 2019-12-30 | 2020-05-08 | 上海市政工程设计研究总院（集团）有限公司 | Two-phase circulating and grading thermal desorption system and method thereof |
| CN111069263A (en) * | 2019-12-31 | 2020-04-28 | 云南省环境科学研究院(中国昆明高原湖泊国际研究中心) | Contaminated soil heat treatment device and contaminated soil heat treatment method |
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| CN111659720A (en) * | 2020-06-29 | 2020-09-15 | 广东佳德环保科技有限公司 | System device and method for soil regeneration treatment |
| CN113275370A (en) * | 2021-05-19 | 2021-08-20 | 国网福建省电力有限公司 | Transformer substation's electrical equipment conflagration soil pollutant processing apparatus |
| CN113577975A (en) * | 2021-08-02 | 2021-11-02 | 鸿灌环境技术有限公司 | Organic pollutant waste gas treatment method in ectopic indirect thermal desorption process |
| CN114939597A (en) * | 2022-05-27 | 2022-08-26 | 江苏省环境科学研究院 | Skid-mounted rapid emergency soil thermal desorption device |
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