CN104438311A - Thermal-sensitivity contaminant contaminated soil thermal drive desorption repair system - Google Patents
Thermal-sensitivity contaminant contaminated soil thermal drive desorption repair system Download PDFInfo
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Abstract
The invention relates to a thermal-sensitivity contaminant contaminated soil thermal drive desorption repair system. The thermal-sensitivity contaminant contaminated soil thermal drive desorption repair system consists of a soil feeding belt, a sieving machine, a coarse crusher, a drying crusher, a thermal driving reactor, a soil cooler, a humidifier, an air purifier, an induced draft fan and an exhaust chimney. By taking waste heat as a heat source, the thermal-sensitivity contaminant contaminated soil thermal drive desorption repair system is suitable for repairing soil contaminated by organic matters such as VOCs, SVOCs, PAHs, PCBs, TPHs and pesticides, and is also suitable for repairing soil contaminated by thermal-sensitivity heavy metals such as Hg and As, the reaction speed is high, the repairing period is short, and the pollutant removal rate is up to more than 99%; the automatic control and the real-time monitoring are utilized so that the system runs safely and stably, and is economical and feasible without secondary pollution; the repaired soil can meet the following reutilization requirements; the environment protection benefits and the social benefits are excellent, and the system is suitable for popularizing and using.
Description
Technical field
The present invention relates to a kind of thermal sensitivity contaminants Soil Thermal and drive desorption repair system, belong to environment protection equipment class.
Background technology
China's soil pollution situation is on the rise.Along with the development of China's industrial or agricultural and the quickening of Development of China's Urbanization, in human being's production and life process, a lot of soil due to environmental practice not in place and contaminated, soil environment worsen.The reason that soil environment worsens is many-sided, a large amount of uses of such as chemical pesticide and agrochemical, and industrial wastewater discharges wantonly, the discharge of hazardous contaminant, and particularly the random stacking of poisonous and harmful solid waste and landfill, all can cause soil pollution.The poisonous and harmful substance of contaminated soil can enter human body by food chain or human breathing, and harm humans is healthy, and even some contaminated soil can by the skin of the mankind, and direct harm humans is healthy.
Organic material contaminated soil and inorganic pollution soil can be divided into according to the kind difference of pollutant.Soil organic pollutant fingering enters soil environment and the organic compound polluted, and mainly comprises volatile organic matter (VOCs), semi-volatile organic matter (SVOCs), polycyclic aromatic hydrocarbon (PAHs), Polychlorinated biphenyls (PCBs), petroleum hydrocarbon (TPHs), agricultural chemicals (Pesticides) etc.The industry including organic pollutants discharge mainly contains petrochemical industry, coking, metallurgy, cement, papermaking, paint and coating manufacture, pesticide producing and use, rubber articles manufacture, automobile and accessory spraying, Electronic products manufacturing etc.Organic pollution mostly is thermal sensitivity pollutant, can resolve, evaporates under heat effect from soil.Most typical in soil inorganic pollutant is heavy metal (HMs), and as Pb, Hg, Cr, Cd, As, Zn, Cu etc., wherein Hg and As is thermal sensitivity heavy metal, can resolve, moves out under heat effect from soil.
At present, China's remediation contaminated soil basis is very weak, very lack ripe to be suitable for, economically feasible, safe and reliable contaminated soil remediation technology and equipment.Current organic material contaminated soil recovery technique mainly comprises phytoremediation, microorganism remediation, normal temperature parsing, physical isolation, chemical redemption, but there are the following problems:
One, the technology repairing efficiency such as phytoremediation, microorganism remediation, normal temperature parsing is very long, and what have needs some months time of even several years.
Two, physical isolation refers to on-the-spot directly covering and strange land landfill, and the method can block route of exposure, but can not reduce its toxicity, and place can exist long-term environmental risk and the restriction of land use function.
Three, chemical redemption utilizes to join chemical redemption agent (as organic matter, chemical reagent, natural minerals etc.) in soil and pollutant generation chemical reaction, change the pH value, Eh etc. of soil, by chemical reaction, change the occurrence patterns of pollutant, thus remove or reduce its toxicity.Chemical redemption speed is fast, but general cost is higher.
Therefore, compare other recovery techniques, heat is driven desorption technology and is received increasing attention by the pollutant in mode of heating separation soil.
The processing method (201210280242.1) of organochlorine pesticide pollution soil discloses a kind of processing method of contaminated soil, and the method sends into the collaborative calcining of cement rotary kiln after organochlorine pesticide pollution soil is carried out pretreatment, and pollutant is decomposed.The weak point of this method: one is too much can affect Cement Quality because cement rotary kiln adds contaminated soil amount, and this method contaminated soil treating capacity is limited; Two is that the method is only applicable to nearer place, contaminated soil distance cement plant, if distant, contaminated soil freight increases, and improves processing cost, less economical.
Now invent a kind of thermal sensitivity contaminants Soil Thermal and drive desorption repair system, adopt indirect desorption, thermal medium does not directly contact with soil, and thermal sensitivity pollutant desorption efficiency is high, the residual heat resources such as flue gas, steam can be utilized, reduce contaminated soil remediation cost.
Summary of the invention
For above-mentioned Problems existing, a kind of thermal sensitivity contaminants Soil Thermal is the object of the present invention is to provide to drive desorption repair system.
For achieving the above object, its technical solution is:
Thermal sensitivity contaminants Soil Thermal drive desorption repair system by give native belt, screening machine, primary mill, drying and crushing machine, heat drives reactor, soil cooler, humidifying device, gas cleaning plant, air-introduced machine, exhaust chimney composition, the described output of native belt of giving is positioned at above the hopper of screening machine, screening machine sidepiece is provided with rough segmentation outlet, segmentation outlet is provided with bottom screening machine, rough segmentation outlet below is provided with primary mill, drying and crushing machine is provided with below primary mill discharging opening, segmentation outlet is connected with drying and crushing machine feeding mouth pipeline, the steam vent being located at drying and crushing machine top is connected with the inlet duct of gas cleaning plant, heat is driven reactor and is provided with cage, the feed hopper of cage is arranged on drying and crushing machine outlet below, cage is provided with binder wind entrance, heat is driven reactor lower part and is provided with reactor soil outlet, soil cooler is provided with soil cooler entrance, soil cooler exports, cooling medium entrance and cooling medium outlet, soil cooler entrance is arranged on below reactor soil outlet, soil cooler outlet below is provided with humidifying device, heat is driven reactor top and is provided with high temperature dust arrester, the outlet of high temperature dust arrester is connected with the inlet duct of gas cleaning plant, the outlet of gas cleaning plant is connected with the inlet duct of air-introduced machine, the outlet of air-introduced machine is connected with the inlet duct of exhaust chimney.
Described gives native belt for having weighing and controlling functions, can measure while conveying, is regulated simultaneously can control to soil amount by belt speed.
Described screening machine is motor machine oscillatory type screening plant, can by contaminated soil screening for being greater than the soil block of 80mm and being less than the soil of 80mm.
Described primary mill is electrodynamic type mechanical disruption device, can particle diameter be become to be less than the soil of 50mm the clods breaking being greater than 80mm.
Described drying and crushing machine has fragmentation and functions/drying concurrently, and contaminated soil can be ground into the soil that particle diameter is less than 20mm, it is controlled that drying capacity is adjustable, according to contaminated soil self property, and can by moisture control below 10% ~ 20%.Adding of agent mouth is repaired on drying and crushing machine top, can add a certain amount of corresponding soil remediation medicament according to contaminated soil self property and reparation target.
The heat exchange mode that described heat drives reactor is indirect heat exchange, and thermal source is high-temperature flue gas, high temperature air, high-temperature steam or high-temp liquid, can make full use of various residual heat resources, effectively reduces the financial cost of hot repairing polluted soil.
Described heat is driven in reactor and is provided with temperature monitoring point, and the reaction temperature that heat is driven in reactor is adjustable, and temperature range is 60 DEG C ~ 700 DEG C.Contaminated soil is that 2min ~ 30min is adjustable in the time of staying that heat is driven in reactor.
It is tiny structure that described heat is driven in reactor, and pressure limit is that-20Pa ~-2000Pa is adjustable.
Described gas cleaning plant has the effect of harmful substance in deodorizing, depickling and cooperation-removal fine grained and other gas, and purified gas meets " atmosphere pollution comprehensive discharge standard " (GB 1621).
Described thermal sensitivity contaminants Soil Thermal drives desorption repair system thermal sensitivity pollutants removal rate and is defined as follows:
Wherein, be thermal sensitivity pollutants removal rate, %; For the thermal sensitivity pollutant levels of cage feed hopper place soil, mg/kg; For the thermal sensitivity pollutant levels of reactor soil outlet place soil, mg/kg.
Described thermal sensitivity contaminants Soil Thermal drives desorption repair system and is arranged on moveable platform.
Owing to have employed above technical scheme, thermal sensitivity contaminants Soil Thermal of the present invention drives desorption repair system and is applicable to polytype organic material contaminated soil, comprise the contaminated soils such as VOCs, SVOCs, PAHs, PCBs, TPHs, agricultural chemicals, organic pollutant removal rate reaches more than 99%; Also thermal sensitivity heavy metal is applicable to, as Hg, As etc.Meanwhile, carried out purified treatment to tail gas, rear discharge up to standard, avoids secondary pollution.
It is stable, homogeneous, not affected by environment to the purification process of contaminated soil that thermal sensitivity contaminants Soil Thermal of the present invention drives desorption repair system; Adopt automatic control system, easy and simple to handle, the process reparation of suitable large area polluted soil, the time is short, and efficiency is high; Adopt indirect desorption, thermal source does not directly contact with soil.Contaminated soil enters after heat drives reactor, and high temperature heat source medium heat exchanger heats the soil that heat is driven in reactor and is heated indirectly.In this process, the thermal sensitivity pollutant in contaminated soil is separated by evaporation, and under high temperature action, thermal sensitivity pollutant decomposes, and tail gas is qualified discharge after the dedusting of high temperature dust arrester, gas cleaning plant purification.Because soil is after discharging, carries out the recycling of heat by cooling medium, be therefore conducive to the fast cooling of soil, be convenient to the later use of soil.
Thermal sensitivity contaminants Soil Thermal of the present invention drives desorption repair system and according to different contaminated soil own characteristics, at different temperatures, through different time, can repair fast contaminated soil.The topology layout that thermal sensitivity contaminants Soil Thermal of the present invention drives desorption repair system is reasonable, achieves and makes full use of residual heat resources, has that heat exchange efficiency is high, energy consumption is low, pollute little feature; Stable equipment operation, operating process is simple and convenient, and flexibility is good, can be arranged in contaminated site, for the on-the-spot showering of contaminated site, reduces cubic metre of earth and stone transhipment amount; Soil remediation reaction speed is fast, efficiency is high, and repairing efficiency is short; Adopt Automated condtrol, reduce the requirement to operator's quantity and proficiency; Adopt Real-Time Monitoring, avoid secondary pollution; Compared with some thermal desorption system both domestic and external, device therefor is simple, and floor space is few, small investment; Operating cost comparatively landfill and directly to add thermal incineration low, and the soil after repairing can reach follow-up recycling requirement, is applicable to promoting the use of.
Accompanying drawing explanation
Fig. 1 is that thermal sensitivity contaminants Soil Thermal of the present invention drives desorption repair system structural representation.
Fig. 2 is renovation technique flow chart of steps.
In Fig. 1: to native belt 1, screening machine 2, rough segmentation outlet 21, segmentation outlet 22, primary mill 3, drying and crushing machine 4, heat drives reactor 5, cage 51, binder wind entrance 52, high temperature dust arrester 53, reactor soil outlet 54, soil cooler 6, soil cooler entrance 61, soil cooler outlet 62, cooling medium entrance 63, cooling medium outlet 64, humidifying device 7, gas cleaning plant 8, air-introduced machine 9, exhaust chimney 10.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail.
A kind of thermal sensitivity contaminants Soil Thermal provided by the present invention drives desorption repair system, by giving native belt 1, screening machine 2, primary mill 3, drying and crushing machine 4, heat drives reactor 5, soil cooler 6, humidifying device 7, gas cleaning plant 8, air-introduced machine 9, exhaust chimney 10 forms, its structure is as shown in Figure 1: be positioned at above the hopper of screening machine 2 to the output of native belt 1, screening machine 2 sidepiece is provided with rough segmentation outlet 21, segmentation outlet 22 is provided with bottom screening machine 2, primary mill 3 is provided with below rough segmentation outlet 21, drying and crushing machine 4 is provided with below primary mill 3 discharging opening, segmentation outlet 22 is connected with drying and crushing machine 4 feeding mouth pipeline, the steam vent being located at drying and crushing machine 4 top is connected with the inlet duct of gas cleaning plant 8, heat is driven reactor 5 and is provided with cage 51, the feed hopper of cage 51 is arranged on drying and crushing machine 4 and exports below, cage 51 is provided with binder wind entrance 52, heat is driven reactor 5 bottom and is provided with reactor soil outlet 54, soil cooler 6 is provided with soil cooler entrance 61, soil cooler outlet 62, cooling medium entrance 63 and cooling medium outlet 64, soil cooler entrance 61 is arranged on below reactor soil outlet 54, humidifying device 7 is provided with below soil cooler outlet 62, heat is driven reactor 5 top and is provided with high temperature dust arrester 53, the outlet of high temperature dust arrester 53 is connected with the inlet duct of gas cleaning plant 8, the outlet of gas cleaning plant 8 is connected with the inlet duct of air-introduced machine 9, the outlet of air-introduced machine 9 is connected with the inlet duct of exhaust chimney 10.
When the present invention repairs thermal sensitivity contaminants soil, concrete steps comprise:
Step 1: contaminated soil material loading.By contaminated soil being transported to screening machine 2 to native belt 1, carry out to soil metering when carrying contaminated soil to native belt 1, simultaneously by controlling to carry out controlling to soil amount to the rotating speed of native belt 1.
Step 2: contaminated soil sieves.The soil that the contaminated soil entering screening machine 2 is divided into particle diameter to be greater than the soil block of 80mm and particle diameter being less than 80mm after screening, the soil block that particle diameter is greater than 80mm exports 21 by rough segmentation and enters primary mill 3, and the soil that particle diameter is less than 80mm to deliver to the entrance of drying and crushing machine 4 through pipeline by segmenting outlet 22.
Step 3: contaminated soil is tentatively broken.Export 21 particle diameters entering primary mill 3 by rough segmentation and be greater than the soil block of 80mm, be broken into through primary mill 3 soil that particle diameter is less than 50mm.
Step 4: contaminated soil drying and crushing.Be less than the soil of 80mm and primary mill 3 by the particle diameter sent here of segmentation outlet 22 and export the soil that the particle diameter sent here is less than 50mm, the soil that particle diameter is less than 20mm is ground in drying and crushing machine 4, heat drying simultaneously, moisture content reduces, according to contaminated soil self property, moisture content can below 10% ~ 20%.Adding of agent mouth is repaired on drying and crushing machine 4 top, a certain amount of corresponding soil remediation medicament can be added according to contaminated soil self property and reparation target, the soil that soil remediation medicament is less than 20mm with particle diameter under the stirring action of drying and crushing machine 4 mixes, and forms mixed medicine soil.The toxic gas that dry run produces is delivered in gas cleaning plant 8 by the steam vent on drying and crushing machine 4 top by pipeline, carries out purified treatment.
Step 5: heat drives desorption harmless treatment.The mixed medicine soil of discharging from the outlet of drying and crushing machine 4 bottom enters the feed hopper of cage 51, under the rotation progradation of cage axle, mixed medicine soil enters heat and drives reactor 5 inside, by indirect, the thermal sensitivity pollutant in soil is separated by evaporation, and thermal sensitivity contaminant molecule structure changes, general long-chain organic matter is split into short chain organic matter, phenyl ring open loop, original organic pollutants functional group chemical bond rupture, generates new innocuous substance or the less material of the extent of injury; General thermal sensitivity heavy metal is evaporated to gaseous state by solid-state.According to contaminated soil character, the heat reaction temperature of driving in reactor 5 be 60 DEG C ~ 700 DEG C adjustable, the heat time, 2min ~ 30min was adjustable.The heat pressure driven in reactor 5 is tiny structure, and pressure limit is that-20Pa ~-2000Pa is adjustable, avoids gas leak.Heat drive in reactor 5 through overheated drive desorption process after soil become the higher hometown earth of temperature.The reactor soil outlet 54 that hometown earth drives reactor 5 through heat is discharged.Isolated thermal sensitivity pollutant and moisture are discharged from the outlet of high temperature dust arrester 53.
Step 6: tail gas clean-up.Soil particle in flue gas is separated with flue gas by high temperature dust arrester 53, flue gas exports from high temperature dust arrester 53 and discharges, gas cleaning plant 8 is entered through pipeline, in gas cleaning plant 8, poisonous and harmful substance in flue gas is removed, become clean flue gas, clean flue gas enters exhaust chimney 10 through air-introduced machine 9, from the discharge of exhaust chimney 10 exhanst gas outlet.The soil particle that bottom high temperature dust arrester 53, soil particle outlet is discharged falls into heat and drives in reactor 5, reclaims.
Step 7: soil cools.The hometown earth of discharging from reactor soil outlet 54 enters soil cooler 6 through soil cooler entrance 61, soil cooler 6 is rotary cooler, the inwall of soil cooler 6 is provided with heat exchanger, cooling water is connected with in heat exchanger, cooling water enters from cooling medium entrance 63, discharges after heat exchange from cooling medium outlet 64.Soil cooler 6 rotates the hometown earth making temperature higher and fully carries out heat exchange with cooling water, thus the reduction soil moisture.Cooled soil is discharged from soil cooler outlet 62.
Step 8: humidification coagulation.From the cooling soil that soil cooler outlet 62 is discharged, the entrance through humidifying device 7 enters humidifying device 7, by water spray stirring humidifying device 7 in, and make it become cleaning soil that moisture content is 10% ~ 15%.Cleaning soil is discharged through the outlet of humidifying device 7, is transported to regulation place by motor vehicles and machines, stand-by.
Claims (6)
1. thermal sensitivity contaminants Soil Thermal drives desorption repair system, it is characterized in that: thermal sensitivity contaminants Soil Thermal drive desorption repair system by give native belt (1), screening machine (2), primary mill (3), drying and crushing machine (4), heat drives reactor (5), soil cooler (6), humidifying device (7), gas cleaning plant (8), air-introduced machine (9), exhaust chimney (10) composition, the described output of native belt (1) of giving is positioned at above the hopper of screening machine (2), screening machine (2) sidepiece is provided with rough segmentation outlet (21), screening machine (2) bottom is provided with segmentation outlet (22), rough segmentation outlet (21) below is provided with primary mill (3), drying and crushing machine (4) is provided with below primary mill (3) discharging opening, segmentation outlet (22) is connected with drying and crushing machine (4) feeding mouth pipeline, the steam vent being located at drying and crushing machine (4) top is connected with the inlet duct of gas cleaning plant (8), heat is driven reactor (5) and is provided with cage (51), the feed hopper of cage (51) is arranged on drying and crushing machine (4) outlet below, cage (51) is provided with binder wind entrance (52), heat is driven reactor (5) bottom and is provided with reactor soil outlet (54), soil cooler (6) is provided with soil cooler entrance (61), soil cooler outlet (62), cooling medium entrance (63) and cooling medium outlet (64), soil cooler entrance (61) is arranged on reactor soil outlet (54) below, soil cooler outlet (62) below is provided with humidifying device (7), heat is driven reactor (5) top and is provided with high temperature dust arrester (53), the outlet of high temperature dust arrester (53) is connected with the inlet duct of gas cleaning plant (8), the outlet of gas cleaning plant (8) is connected with the inlet duct of air-introduced machine (9), the outlet of air-introduced machine (9) is connected with the inlet duct of exhaust chimney (10).
2. as right 1 require as described in thermal sensitivity contaminants Soil Thermal drive desorption repair system, it is characterized in that: described weighs and controlling functions for having to native belt (1), can measure while conveying, be regulated by belt speed simultaneously and can control to soil amount.
3. as right 1 require as described in thermal sensitivity contaminants Soil Thermal drive desorption repair system, it is characterized in that: the heat exchange mode that described heat drives reactor (5) is indirect heat exchange, and thermal source is high-temperature flue gas, high temperature air, high-temperature steam or high-temp liquid.
4. as right 1 require as described in thermal sensitivity contaminants Soil Thermal drive desorption repair system, it is characterized in that: described heat is driven in reactor (5) and is provided with temperature monitoring point, the reaction temperature that heat is driven in reactor (5) is adjustable, and temperature range is 60 DEG C ~ 700 DEG C.
5. as right 1 require as described in thermal sensitivity contaminants Soil Thermal drive desorption repair system, it is characterized in that: contaminated soil is that 2min ~ 30min is adjustable in the heat time of staying of driving in reactor (5).
6. as right 1 require as described in thermal sensitivity contaminants Soil Thermal drive desorption repair system, it is characterized in that: it is tiny structure that described heat is driven in reactor (5), and pressure limit is that-20Pa ~-2000Pa is adjustable.
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| CN105855284A (en) * | 2016-05-26 | 2016-08-17 | 江苏新光环保工程有限公司 | Thermal desorption integrated treatment method and device |
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| CN108637000A (en) * | 2016-05-12 | 2018-10-12 | 温州泓呈祥科技有限公司 | Soil remediation device for removing organochlorine pesticide components in farmland soil |
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| CN108225868A (en) * | 2018-03-05 | 2018-06-29 | 王健 | Highway engineering subgrade produces jointly instrument with filling's dry density measure standard soil sample |
| CN108225868B (en) * | 2018-03-05 | 2023-12-08 | 王健 | Standard soil sample combined making instrument for dry density measurement of soil for highway engineering roadbed |
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| CN115121599A (en) * | 2022-06-23 | 2022-09-30 | 天津壹鸣环境污染治理有限公司 | Soil remediation system and remediation method |
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Application publication date: 20150325 |