CN211247736U - Soil thermal desorption coupling drip washing repair system - Google Patents
Soil thermal desorption coupling drip washing repair system Download PDFInfo
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- CN211247736U CN211247736U CN201921732680.0U CN201921732680U CN211247736U CN 211247736 U CN211247736 U CN 211247736U CN 201921732680 U CN201921732680 U CN 201921732680U CN 211247736 U CN211247736 U CN 211247736U
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Abstract
The utility model provides a soil thermal desorption coupling drip washing repair system, including first feed unit, second feed unit, thermal desorption unit, gas-solid separation unit, soil discharging unit, gas discharging unit and soil drip washing unit, first feed unit and second feed unit all link to each other with thermal desorption unit, and thermal desorption unit passes through gas-solid separation unit and links to each other with gas discharging unit and soil discharging unit. The utility model discloses in, adopt fluidization thermal desorption form to combine the straw burning degree of depth thermal desorption, can effectively get rid of the volatile organic compounds in the soil and keep soil fertility simultaneously to coupling drip washing repair technique gets rid of heavy metal pollutants in the soil, is applicable to the restoration of compound contaminated soil.
Description
Technical Field
The utility model relates to a soil remediation technical field, concretely relates to soil remediation system and method.
Background
With the continuous improvement of the law and standard of soil remediation, the remediation method and means are also continuously updated. The contaminated soil remediation methods include physical remediation, chemical remediation, biological remediation and combined remediation methods. Currently, the types of soil pollution are mainly classified into single metal pollution, single organic matter pollution and composite pollution. For the complex contaminated soil (metal-organic compound contaminated soil) which is difficult to treat, the problem is usually solved by adopting a leaching and thermal desorption method. However, the existing soil treatment equipment has the problems of low pollutant removal rate, reduced soil fertility after remediation and the like, so that an economical and efficient soil remediation system is urgently needed to be developed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a not only can realize not destroying or increase the soil thermal desorption coupling drip washing repair system of soil fertility to polluting the high-efficient restoration of soil.
In order to achieve the above object, the utility model provides a soil thermal desorption coupling drip washing repair system, including first feed unit, second feed unit, thermal desorption unit, gas-solid separation unit, soil discharging unit, gas discharging unit and soil drip washing unit, first feed unit and second feed unit all link to each other with thermal desorption unit, thermal desorption unit links to each other with gas discharging unit and soil discharging unit through gas-solid separation unit;
the first feeding unit comprises a soil crusher, a vibrating screening machine, a magnetic separator and a first feeding bin which are connected in sequence; the second feeding unit comprises a straw crusher and a second feeding bin which are connected in sequence;
the thermal desorption unit comprises a fluidized bed reactor, an overheated steam generator and a compressed air pump, wherein the feeding end of the fluidized bed reactor is respectively connected with a first feeding bin and a second feeding bin, and the gas inlet end of the fluidized bed reactor is respectively connected with the overheated steam generator and the compressed air pump;
the gas discharging unit comprises a bag-type dust remover, a first condenser and a sewage processor which are connected in sequence, and the front end of the bag-type dust remover is connected with the gas-solid separation unit;
the soil discharging unit comprises a cooler, a spraying maintenance device, a leaching stirring tank, a filter press and a clean soil stacking tank which are connected in sequence, the front end of the cooler is connected with the gas-solid separation unit, and filtrate of the filter press is connected with the sewage treatment device through a pipeline.
Preferably, in the soil thermal desorption coupling leaching remediation system, a gas distribution plate is arranged at the bottom of the fluidized bed reactor.
Preferably, in the soil thermal desorption coupling elution repair system, the spray maintenance device comprises a screw conveyor and spray headers arranged on two sides of the screw conveyor.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the soil pretreated by the crusher and the vibrating screen is crushed into particles with the particle size of about 10mm, the particles enter the fluidized bed reactor, the soil is fluidized at a proper gas velocity, superheated steam is used as a heating medium and is in direct contact with the polluted soil for thermal desorption, the heated area of the soil can be increased, the volatilization speed of volatile and semi-volatile pollutants from the soil is accelerated, and the soil remediation efficiency is improved;
(2) adding the crushed biological straws into the fluidized bed reactor through the second feeding unit, fully mixing the biological straws with the soil through gas purging, and introducing a proper amount of compressed air at high temperature to ensure that the biological straws are self-ignited and the thermal desorption temperature is increased, and the biological straws are combusted and gasified to be used as fertilizer and dispersed in the soil, so that the soil fertility can be maintained;
(3) the thermal desorption and the leaching are combined, so that volatile organic compounds in the soil can be removed, heavy gold pollutants in the soil can be effectively removed, and the method is suitable for repairing the composite pollution type soil.
Drawings
Fig. 1 is a schematic diagram of a soil thermal desorption coupling leaching remediation system.
In the figure: 11-soil crusher, 12-vibration screening machine, 13-magnetic separator, 14-first feeding bin, 21-straw crusher, 22-second feeding bin, 31-fluidized bed reactor, 32-superheated steam generator, 33-compressed air pump, 4-cyclone separator, 51-bag dust remover, 52-condenser, 61-cooler, 62-spray maintenance device, 621-spiral conveyor, 622-spray head, 63-drip washing stirring tank, 64-filter press, 65-clean soil piling tank and 7-sewage treatment device.
Detailed Description
The soil thermal desorption coupling drip washing remediation system of the present invention will now be described in greater detail with reference to the schematic drawings, in which preferred embodiments of the present invention are shown, it being understood that those skilled in the art may modify the invention described herein while still achieving the beneficial effects of the present invention. Accordingly, the following description should be construed as broadly as possible to those skilled in the art and not as limiting the invention.
Referring to fig. 1, the soil thermal desorption coupling leaching repair system comprises a first feeding unit, a second feeding unit, a thermal desorption unit, a gas-solid separation unit, a soil discharging unit, a gas discharging unit and a soil leaching unit, wherein the first feeding unit and the second feeding unit are connected with the thermal desorption unit, and the thermal desorption unit is connected with the gas discharging unit and the soil discharging unit through the gas-solid separation unit. The gas-solid separation unit is a cyclone separator 4.
The first feeding unit comprises a soil crusher 11, a vibrating screen, a magnetic separator 13 and a first feeding bin 14 which are connected in sequence; the second feeding unit comprises a straw crusher 21 and a second feeding bin 22 connected in series. The first feeding bin 14 is used for conveying soil to be restored into the fluidized bed reactor 31, and the second feeding bin 22 is used for conveying straw particles into the fluidized bed reactor 31.
The thermal desorption unit comprises a fluidized bed reactor 31, a superheated steam generator 32 and a compressed air pump 33, and a gas distribution plate is arranged at the bottom of the fluidized bed reactor 31. The feeding end of the fluidized bed reactor 31 is connected with the first feeding bin 14 and the second feeding bin 22 respectively, the gas inlet end of the fluidized bed reactor 31 is connected with the superheated steam generator 32 and the compressed air pump 33 respectively, the superheated steam generator 32 is used for providing superheated steam into the fluidized bed reactor 31 as a heat source, and the compressed air pump 33 (air compressor) is used for passing compressed air into the fluidized bed reactor 31 as combustion-supporting gas.
The gas discharging unit comprises a bag-type dust collector 51, a condenser 52 and a sewage processor 7 which are connected in sequence, and the front end of the bag-type dust collector 51 is connected with the gas-solid separation unit.
The soil discharging unit comprises a cooler 61, a spraying maintenance device 62, a leaching stirring tank 63, a filter press 64 and a clean soil stacking tank 65 which are connected in sequence, the front end of the cooler 61 is connected with the gas-solid separation unit, and the filtrate of the filter press 64 is connected with the sewage treatment device 7 through a pipeline. The spray curing device 62 includes a screw conveyor 621 and spray heads 622 disposed on both sides of the screw conveyor 621.
The process flow of the soil remediation system is as follows:
s1 soil pretreatment: after the polluted soil is crushed by the soil crusher 11, the soil is sieved by the vibration sieving machine 12 to obtain the soil with the particle size of 8 mm-12 mm, and the soil is transported to the first feeding bin 14 by the plate type conveyer belt, and in the transportation process, the waste iron in the polluted soil containing iron waste is sieved by the magnetic separator 13;
s2 thermal desorption: the crushed soil enters a fluidized bed reactor 31 through a first feeding bin 14, superheated steam with the temperature of about 100-300 ℃ is generated by a superheated steam generator 32, the superheated steam is in reverse contact with the soil, and the gas velocity of the superheated steam is continuously increased, so that the reactor is in a fluidized state, and the fluidized gas velocity U istGenerally 0.8-3 m/s, the fluidized desorption time can be maintained for 0.5-1 h, and the stage is mainly used for removing volatile organic compounds, such as: chlorine-containing low-carbon alkane, chlorine-containing low-carbon olefin, benzene, methylene bromide and the like;
s3 deep thermal desorption: for the organic matters which are difficult to volatilize and contain hexachlorocyclopentadiene, nitrobenzene, 2, 4-dinitrotoluene, benzanthracene, benzopyrene and the like, after the volatile organic matters are removed in the step S2, biological straw particles are added into the fluidized bed reactor 31 through the second feeding unit, after the biological straw particles are uniformly mixed with polluted soil under the sweeping of superheated steam, a proper amount of compressed air is introduced, the compressed air is used as combustion-supporting gas, the biological straw is ignited in the fluidized bed reactor 31, the biological straw is ignited to release a large amount of heat, the thermal desorption temperature in the reactor is improved, the temperature in the reactor is adjusted by the superheated steam to be maintained at 500-600 ℃, the biological straw is burnt to become organic fertilizer which is uniformly dispersed in the soil, and the soil fertility is kept after the repair;
and S4 tail gas treatment: the superheated steam containing the organic waste enters a condenser 52 through a cyclone separator 4 and a bag-type dust collector 51, and enters a sewage treatment device 7 after being condensed;
s5 soil cleaning and maintenance: the soil treated in the step S2 and/or the step S3 is separated by the cyclone separator 4, then enters the cooler 61 to be cooled to normal temperature, and for the soil without heavy metal pollutants, the soil is directly conveyed to the clean soil stacking groove 65 after passing through the spray maintenance device 62; for the soil containing heavy metal pollutants, the soil is conveyed to a leaching and stirring tank 63 through a spraying and maintaining device 62, aqueous solutions such as hydrochloric acid, malic acid or sodium hydroxide are introduced into the leaching and stirring tank 63 to serve as leaching agents (the leaching agents can be adjusted according to the types of the heavy metal pollutants), cement paste is stirred for 0.5h-1h, the sewage is discharged into a sewage processor 7 after being filtered by a filter press 64, and filter cakes are conveyed to a soil cleaning stacking tank 65 to be dried and backfilled.
The above description is only for the preferred embodiment of the present invention, and does not limit the present invention. Any technical personnel who belongs to the technical field, in the scope that does not deviate from the technical scheme of the utility model, to the technical scheme and the technical content that the utility model discloses expose do the change such as the equivalent replacement of any form or modification, all belong to the content that does not break away from the technical scheme of the utility model, still belong to within the scope of protection of the utility model.
Claims (3)
1. The soil thermal desorption coupling leaching repair system is characterized by comprising a first feeding unit, a second feeding unit, a thermal desorption unit, a gas-solid separation unit, a soil discharging unit, a gas discharging unit and a soil leaching unit, wherein the first feeding unit and the second feeding unit are connected with the thermal desorption unit;
the first feeding unit comprises a soil crusher, a vibrating screening machine, a magnetic separator and a first feeding bin which are connected in sequence; the second feeding unit comprises a straw crusher and a second feeding bin which are connected in sequence;
the thermal desorption unit comprises a fluidized bed reactor, an overheated steam generator and a compressed air pump, wherein the feeding end of the fluidized bed reactor is respectively connected with a first feeding bin and a second feeding bin, and the gas inlet end of the fluidized bed reactor is respectively connected with the overheated steam generator and the compressed air pump;
the gas discharging unit comprises a bag-type dust remover, a condenser and a sewage processor which are connected in sequence, and the front end of the bag-type dust remover is connected with the gas-solid separation unit;
the soil discharging unit comprises a cooler, a spraying maintenance device, a leaching stirring tank, a filter press and a clean soil stacking tank which are connected in sequence, the front end of the cooler is connected with the gas-solid separation unit, and filtrate of the filter press is connected with the sewage treatment device through a pipeline.
2. The soil thermal desorption coupling leaching remediation system of claim 1, wherein the bottom of the fluidized bed reactor is provided with a gas distribution plate.
3. The soil thermal desorption coupling drip washing repair system of claim 1, wherein the spray maintenance device comprises a screw conveyor and spray headers arranged at two sides of the screw conveyor.
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| CN201921732680.0U CN211247736U (en) | 2019-10-14 | 2019-10-14 | Soil thermal desorption coupling drip washing repair system |
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| CN201921732680.0U CN211247736U (en) | 2019-10-14 | 2019-10-14 | Soil thermal desorption coupling drip washing repair system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112090952A (en) * | 2020-08-29 | 2020-12-18 | 山西大学 | Boiling type micro-foam soil pollution desorption device and method suitable for coking field |
| CN112775166A (en) * | 2020-12-01 | 2021-05-11 | 光大环境修复(江苏)有限公司 | Organic-heavy metal combined polluted soil remediation method and device |
| CN115945510A (en) * | 2022-12-23 | 2023-04-11 | 中科鼎实环境工程有限公司 | Heavy metal pollution purification device and purification method applied to farmland |
-
2019
- 2019-10-14 CN CN201921732680.0U patent/CN211247736U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112090952A (en) * | 2020-08-29 | 2020-12-18 | 山西大学 | Boiling type micro-foam soil pollution desorption device and method suitable for coking field |
| CN112775166A (en) * | 2020-12-01 | 2021-05-11 | 光大环境修复(江苏)有限公司 | Organic-heavy metal combined polluted soil remediation method and device |
| CN115945510A (en) * | 2022-12-23 | 2023-04-11 | 中科鼎实环境工程有限公司 | Heavy metal pollution purification device and purification method applied to farmland |
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