CN110883081A - Contaminated soil ex-situ remediation system - Google Patents
Contaminated soil ex-situ remediation system Download PDFInfo
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- CN110883081A CN110883081A CN201911327711.9A CN201911327711A CN110883081A CN 110883081 A CN110883081 A CN 110883081A CN 201911327711 A CN201911327711 A CN 201911327711A CN 110883081 A CN110883081 A CN 110883081A
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- 239000002689 soil Substances 0.000 title claims abstract description 92
- 238000005067 remediation Methods 0.000 title claims abstract description 23
- 238000011066 ex-situ storage Methods 0.000 title claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 61
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 22
- 239000002912 waste gas Substances 0.000 claims abstract description 18
- 230000008569 process Effects 0.000 claims abstract description 16
- 238000000197 pyrolysis Methods 0.000 claims abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 29
- 239000007789 gas Substances 0.000 claims description 26
- 238000005192 partition Methods 0.000 claims description 22
- 238000009826 distribution Methods 0.000 claims description 20
- 239000002918 waste heat Substances 0.000 claims description 20
- 230000005540 biological transmission Effects 0.000 claims description 19
- 238000001179 sorption measurement Methods 0.000 claims description 15
- 239000010815 organic waste Substances 0.000 claims description 13
- 230000001172 regenerating effect Effects 0.000 claims description 12
- 239000000428 dust Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 238000007790 scraping Methods 0.000 claims description 9
- 230000009471 action Effects 0.000 claims description 4
- 238000012216 screening Methods 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 238000001816 cooling Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 239000003344 environmental pollutant Substances 0.000 description 6
- 231100000719 pollutant Toxicity 0.000 description 6
- 238000003900 soil pollution Methods 0.000 description 6
- 239000003638 chemical reducing agent Substances 0.000 description 5
- 230000007480 spreading Effects 0.000 description 5
- 238000003892 spreading Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 239000003345 natural gas Substances 0.000 description 4
- 230000002265 prevention Effects 0.000 description 4
- 239000011449 brick Substances 0.000 description 3
- 238000003795 desorption Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000002957 persistent organic pollutant Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Classifications
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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
-
- 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
- B01D53/04—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 stationary adsorbents
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/061—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating
- F23G7/065—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel
- F23G7/066—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel preheating the waste gas by the heat of the combustion, e.g. recuperation type incinerator
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Soil Sciences (AREA)
- Mechanical Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a contaminated soil ex-situ remediation system for remediating organic contaminated soil, which comprises a preheating chamber, a vibrating screen classifier with an input end connected with the preheating chamber, a first pipeline with two ends respectively connected with the vibrating screen classifier and a three-way valve, two heating decomposition chambers respectively connected with the other two ends of the three-way valve, a gate valve arranged at the joint of the heating decomposition chambers and the three-way valve, a grate cooler with an input end connected with the two heating decomposition chambers, a heat return pipeline with two ends respectively connected with the grate cooler and the preheating chamber, and a waste gas treatment device connected with the two heating decomposition chambers. The invention is used for treating organic contaminated soil, organic matters in the soil are removed by utilizing the pyrolysis principle, heat circularly flows in the treatment process, and the treatment cost can be effectively reduced.
Description
Technical Field
The invention relates to the technical field of polluted soil ex-situ remediation, in particular to an organic polluted soil ex-situ remediation system.
Background
With the acceleration of the urbanization process and the industrial transfer pace, the original land utilization function of the city is changed, a large amount of industrial land is changed into commercial land or residential land, and in the last few years, tens of thousands of industrial enterprises of different types have been moved around in the country, and particularly, the high-pollution enterprises including chemical enterprises are quitted, so that the related polluted land area is extremely amazing.
Foreign statistics show that the volatile semi-volatile organic pollution site accounts for more than 80% of the total amount of the pollution site, and has the advantages of large amount, wide range, serious general pollution, complex pollutant components, high toxicity and larger health risk. In the repairing process, the health and the surrounding ecological environment of constructors and surrounding people are directly influenced because the pollutants volatilize and diffuse or are adsorbed in soil particles and migrate along with the dust.
In 2017, the state provides a soil pollution prevention and control action plan, and provides targets of accelerating the implementation of soil pollution treatment and restoration pilot project and promoting the construction of a soil pollution comprehensive prevention and control advanced area. The soil pollution prevention and control method of the people's republic of China is formally implemented in 1 month and 1 st in 2019, and indicates that the country supports scientific and technological research and development, achievement transformation and popularization and application of pollution prevention and control such as soil pollution risk management and control, restoration and monitoring. The emergence of a series of regulatory policies indicates that the country attaches importance to the soil pollution control work.
The contaminated site soil remediation technology can be divided into an in-situ remediation technology and an ex-situ remediation technology according to remediation modes, wherein the ex-situ remediation technology refers to a technology of excavating contaminated soil from a contaminated position and then treating the contaminated soil within an original site range or after transportation. The ex-situ remediation is suitable for treating a field with higher pollution concentration, higher risk and less polluted soil; the method can select a direct and effective technical method to intensively treat the polluted soil, has high treatment efficiency and thorough treatment, is easy to control in the aspect of monitoring, and can reduce the monitoring cost.
For organic pollutants in soil, ectopic treatment methods with wide application range currently include ectopic chemical oxidation, ectopic thermal desorption and the like. The ectopic thermal desorption technology is to extract the polluted soil, heat the target pollutant in the polluted soil to be above the boiling point of the pollutant through direct or indirect heating, and selectively promote the pollutant to be gasified and volatilized by controlling the temperature of a system and the retention time of materials so as to separate and remove the target pollutant from soil particles. At present, the conventional ex-situ thermal desorption treatment mode needs to heat the soil to 300-400 ℃, so that the energy consumption is large and the treatment cost is higher.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an ex-situ remediation system for organic contaminated soil, which can improve the utilization rate of heat and reduce the treatment cost of the contaminated soil.
The above object of the present invention is achieved by the following technical solutions:
an ex-situ contaminated soil remediation system for remediating organically contaminated soil comprising:
a preheating chamber;
the input end of the vibrating screen classifier is connected with the preheating chamber;
one end of the first pipeline is connected with the vibrating screening machine, and the other end of the first pipeline is connected with a three-way valve;
the two heating decomposition chambers are respectively connected with the other two ends of the three-way valve;
the gate valve is arranged at the joint of the heating decomposition chamber and the three-way valve;
the input end of the grate cooler is connected with the two heating decomposition chambers;
the input end of the heat return pipeline is connected with the grate cooler, and the output end of the heat return pipeline is connected with the preheating chamber;
and the waste gas treatment device is connected with the two heating decomposition chambers and is used for treating organic matters generated in the pyrolysis process.
The invention is further provided that a waste heat pipeline is arranged in the preheating chamber, and a waste heat air hole is arranged on the waste heat pipeline;
the waste heat pipelines are uniformly distributed on the inner side of the bottom surface of the preheating chamber, and the waste heat air holes face the bottom surface of the preheating chamber.
The invention is further configured to: the pyrolysis chamber includes:
a heating chamber;
a partition plate provided in the heating chamber to divide an interior thereof into a first portion and a second portion located below the first portion;
a heater disposed within the second portion;
the paving part is used for paving the organic contaminated soil on the partition plate;
and the scraping part is used for pushing away the organic contaminated soil on the partition plate.
The invention further provides that the spreading part comprises: the first chain type transmission device is arranged in the first part, the distribution hopper is arranged on the first chain type transmission device, and the first driving device is arranged on the outer wall of the heating chamber and used for the first chain type transmission device to act;
the distribution funnel tends to decrease in cross-sectional area in the direction approaching the partition.
The present invention is further configured such that the scraping section includes: the second chain type transmission device is arranged in the first part, the scraper is arranged on the second chain type transmission device, and the second driving device is arranged on the outer wall of the heating chamber and used for the second chain type transmission device to act;
the scraper abuts on the upper surface of the partition board.
The invention is further configured to: the waste gas treatment device comprises a heat exchanger and an activated carbon adsorption tank connected with the heat exchanger;
the preheating device further comprises a heat return pipe, and two ends of the heat return pipe are respectively connected with the heat exchanger and the preheating chamber.
The invention is further configured to: the waste gas treatment device comprises a heat exchanger, a multi-channel valve connected with the heat exchanger and a plurality of activated carbon adsorption tanks connected with the multi-channel valve;
a plurality of the activated carbon adsorption tanks work alternately;
and two ends of the heat return pipeline are respectively connected with the heat exchanger and the preheating chamber.
The invention is further configured to: the waste gas treatment device comprises an organic waste gas heat accumulating type incinerator and a waste gas pipeline;
and two ends of the heat return pipeline are respectively connected with the heating decomposition chamber and the organic waste gas heat accumulating type incinerator.
The invention is further configured to: and a cyclone dust collector is arranged at the joint of the waste gas pipeline and the organic waste gas heat accumulating type incinerator.
By adopting the technical scheme, the method has the advantages that,
in conclusion, the beneficial technical effects of the invention are as follows:
the organic contaminated soil to be treated is sent into a preheating chamber to be heated, then is sent into a heating chamber to be heated after being sorted by a vibrating screen classifier, and the two heating chambers work alternately. The temperature of the soil heated at high temperature rises, and organic pollutants in the soil volatilize and are sent into a waste gas treatment device for treatment. And feeding the heated soil into a grate cooler for cooling treatment, and feeding hot air generated in the cooling process back to the preheating chamber to heat the soil added subsequently. The whole treatment process is continuously carried out, heat circularly flows, and the energy consumption is lower.
Drawings
Fig. 1 is a schematic perspective view of an embodiment of the present invention.
Fig. 2 is a schematic connection diagram of a first pipeline, a three-way valve, a heating decomposition chamber and a gate valve according to an embodiment of the present invention.
Fig. 3 is a schematic view of the internal structure of the preheating chamber in fig. 1.
Fig. 4 is a schematic structural diagram of a waste heat pipeline according to an embodiment of the present invention.
Fig. 5 is a schematic view of the internal structure of the pyrolysis chamber in fig. 1.
Fig. 6 is a schematic view of the working principle of the distribution auger in fig. 5.
Fig. 7 is a schematic view of an operation principle of a push rod according to an embodiment of the present invention.
Fig. 8 is a schematic perspective view of another embodiment of the present invention.
In the figure, 1, a preheating chamber, 2, a vibrating screen classifier, 3, a first pipeline, 4, a three-way valve, 5, a heating decomposition chamber, 6, a gate valve, 7, a grate cooler, 8, a regenerative pipeline, 9, a waste gas treatment device, 11, a waste heat pipeline, 12, a waste heat air hole, 51, a heating chamber, 52, a partition plate, 511, a first part, 522, a second part, 53, a heater, 54, a paving part, 55, a scraping part, 541, a first chain transmission device, 542, a distribution hopper, 543, a first driving device, 551, a second chain transmission device, 552, a scraping plate, 553, a second driving device, 61, a distribution auger, 62, a feed opening, 63, a plate, 64, a push rod, 91, a heat exchanger, 92, an activated carbon adsorption box, 93, a regenerative pipe, 95, a cyclone dust collector, 96 and a multi-channel valve.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the contaminated soil ex-situ remediation system disclosed by the embodiment of the invention mainly comprises a preheating chamber 1, a vibrating screening machine 2, a heating decomposition chamber 5, a grate cooler 7, a waste gas treatment device 9 and the like, wherein the preheating chamber 1 is a device for heating soil, the bottom surface of the preheating chamber is an inclined surface, the top surface of the preheating chamber is provided with a feed inlet, a cover plate is installed at the feed inlet, the cover plate is opened when soil is added, and the cover plate is installed back after the soil is added.
The vibrating screen machine 2 is used for screening preheated soil, because the soil contains impurities such as stones, and the impurities can absorb a large amount of heat in the subsequent heating process, the cooling speed is slow, and the absorbed heat can not be recovered basically, so that the impurities need to be removed firstly. The reason why the soil is heated and then sieved is that the soil is more easily separated from the surface of impurities due to the decrease of moisture in the soil after heating.
The number of the pyrolysis chamber 5 is two, and the two are alternately operated. In consideration of economy, the vibrating screen machine 2 works continuously, the discharging process is continuous, and heating needs a certain time, so that the number of the heating decomposition chambers 5 is increased, when one is heated, soil screened by the vibrating screen machine 2 flows into the other, and the two work alternately.
In the heating process, organic matters in the soil volatilize and enter the waste gas treatment device 9 for treatment. And the heated soil flows out of the heating decomposition chamber 5 and enters the grate cooler 7 for cooling. The grate cooler 7 is an air-cooled cooling device, heated soil is flatly laid on a grate plate at the back of the grate cooler 7, external cold air is sent into an air chamber in the grate cooler 7 by a fan and then sent into the soil flatly laid on the grate plate, and the cold air completes heat exchange with the soil in the process of flowing through the soil, so that the temperature of the soil is reduced. Hot air generated by the grate cooler 7 is sent into the preheating chamber 1 through the heat return pipeline 8 to preheat the normal temperature soil in the preheating chamber.
Referring to fig. 2, the vibrating screen machine 2 is connected with the pyrolysis chamber 5 through a first pipeline 3 and a three-way valve 4, one end of the first pipeline 3 is connected with the output end of the vibrating screen machine 2, and the other end is connected with the three-way valve 4. The other two ends of the three-way valve 4 are respectively connected with the input ends of the two heating decomposition chambers 5, the joint of the two heating decomposition chambers 5 is respectively provided with a gate valve 6, and in the working process, the two gate valves 6 are alternately opened to enable the preheated soil to respectively flow into the two heating decomposition chambers 5.
In the treatment process, the soil to be treated is sent into the preheating chamber 1 by equipment such as a forklift or a belt conveyor, the temperature of the soil rises after the soil is preheated, then the soil flows into the first pipeline 3, flows into the first heating decomposition chamber 5 through the three-way valve 4, and flows into the grate cooler 7 after the soil is heated for air cooling. During the heating in the first pyrolysis chamber 5, the preheated soil flows into the second pyrolysis chamber 5.
And the cooled soil flows out of the grate cooler 7 and is conveyed to a storage area for storage. High-temperature air generated in the cooling process is returned to the preheating chamber 1 through the heat return pipeline 8 to heat the soil fed into the preheating chamber 1, and heat circularly flows between the preheating chamber 1 and the grate cooler 7.
In the aspect of workshop layout, the preheating chamber 1 and the vibrating screen 2 are positioned on the first layer, the heating decomposition chamber 5 and the waste gas treatment device 9 are positioned on the second layer, the grate cooler 7 is positioned on the third layer, and the height of each layer is sequentially reduced, so that the soil can be driven to flow by gravity, and the production energy consumption is further reduced. Of course, if the production area does not allow it, it can also be arranged in the same plane, but with the aid of a hoist it is necessary to bring the soil to flow in the treatment sequence.
Referring to fig. 3 and 4, in an embodiment, the preheating chamber 1 is uniformly distributed with waste heat pipes 11, and the waste heat pipes 11 are provided with waste heat air holes 12 along the axial direction thereof, wherein the waste heat air holes 12 face the bottom surface of the preheating chamber 1. The waste heat pipes 11 are fixed at both ends to the side walls of the adjacent preheating compartments 1, respectively, and one end thereof protrudes from the preheating compartments 1 for connection to the return heat pipes 8. The hot air flowing out of the grate cooler 7 flows into an austenite waste heat pipeline 11 through a heat return pipeline 8, and then is injected into the soil in the preheating chamber 1 through a waste heat air hole 12 to increase the temperature of the soil.
The bottom surface of the preheating chamber 1 is provided with a flashboard, the flashboard is driven by a hydraulic cylinder, after preheating is completed, the hydraulic cylinder pulls the flashboard to move, an inclined material opening on the bottom surface of the preheating chamber 1 is exposed, and the preheated soil flows into the vibrating screen classifier 2 under the action of gravity.
Referring to fig. 5, in an embodiment, the pyrolysis chamber 5 is composed of a heating chamber 51, a partition plate 52, a first portion 511, a second portion 522, a heater 53, a spreading portion 54, a scraping portion 55, and the like, the heating chamber 51 is a box body, the inside of which is partitioned by the partition plate 52 to form two mutually independent spaces, i.e., the first portion 511 and the second portion 522, and the first portion 511 is located above the second portion 522.
The heater 53 is disposed in the second section 522, and mainly includes a natural gas burner installed in the second section 522, an air supply duct and an air supply duct, which are respectively installed on a sidewall of the heating chamber 51 and communicate with the second section 522, for supplying natural gas and air into the second section 522. The natural gas is ejected from the natural gas burner, ignited and burned, and directly heats the partition plate 52.
The spreading part 54 spreads the soil on the partition plate 52 to be sufficiently heated, and the scraping part 55 pushes away the soil on the partition plate 52. During the treatment, the spreading section 54 and the scraping section 55 are operated alternately to complete the pyrolysis of the soil in the heating chamber 51.
In one embodiment, the material spreading portion 54 mainly comprises a first chain transmission device 541, a material distribution funnel 542, a first driving device 543, and the like, the first chain transmission device 541 comprises a rotating shaft installed on the heating chamber 51, a chain wheel installed on the rotating shaft, a chain wound around the chain wheel, and the like, the number of the rotating shaft is two, both of which are rotatably connected with the heating chamber 51, and a sliding bearing is installed at the joint of the two, because the sliding bearing has a simple structure and can withstand high temperature, the copper sliding bearing also has a certain self-lubricating property. Two chain wheels are mounted on each rotating shaft, the number of the chains is two, the chains are wound on the two chain wheels on the same side respectively, forged chains or heavy-duty chains are used as the chains, the two chains are high in strength and simple in structure, and the two chains can adapt to the working environment of high temperature and dust in the heating chamber 51.
The first driving device 543 is composed of a motor and a speed reducer, a rotating shaft of the motor is connected with an input shaft of the speed reducer, an output shaft of the speed reducer is connected with one rotating shaft of the paving part 54 through a universal joint, the universal joint can adjust different axial degrees between the two, the motor, the speed reducer and the heating chamber 51 can be kept at a distance, and the temperature of the motor and the speed reducer is prevented from being too high.
Two ends of the distributing hopper 542 are respectively and fixedly connected to the adjacent chains, and the joints are fixed by bolts. The soil transferred into the heating chamber 651 flows into the distribution hopper 542 and moves together with the same, and is uniformly spread on the partition plate 52 in a certain process. In order to further improve the uniformity of the soil thickness on the partition plate 52, the cross-sectional area of the distribution funnel 542 tends to decrease in the direction close to the partition plate 52, so that the falling speed of the soil can be reduced, and the situation that the soil is thick and thin on one side can be avoided.
Referring to fig. 5 and 6, the direction of the arrows in fig. 6 is the direction of the flow of the soil. In one embodiment, a material distribution auger 61 is additionally installed on the heating chamber 51, a plurality of feed openings 62 are provided on the casing of the material distribution auger 61, the feed openings 62 are all located right above the material distribution funnel 542, and the input end of the material distribution auger 61 is connected with one end of the three-way valve 4. The soil flowing into the distributing auger 61 can flow into the distributing hopper 542 from the plurality of feed openings 62, so that the soil can be distributed more uniformly in the distributing hopper 542.
Referring to fig. 7, further, a plate 63 can be hinged on the bottom surface of the distribution funnel 542, and one or more push rods 64 can be horizontally fixed on the inner wall of the heating chamber 51, and when the distribution funnel 542 is positioned right below the distribution auger 61, the push rod 64 is positioned right below the plate 63 and abuts against the lower surface of the plate 63. At this time, the plate 63 is attached to the bottom surface of the distribution funnel 542, and the plate is closed. As the distribution funnel 542 moves, the plate 63 moves with it and is moved away from the push rod 64. The soil in the distribution hopper 542 pushes the plate 63 away and falls onto the partition 52 below.
The board 63 can play the interception effect, avoids soil piling up on the baffle 52 of in-process that falls into cloth funnel 542 in the below, causes the thickness of this department soil too thick, appears being heated the insufficient condition.
Referring to fig. 5, in an embodiment, the scraping portion 55 mainly includes a second chain transmission device 551, a scraper 552, a second driving device 553, and the like, the structure of the second chain transmission device 551 is the same as that of the first chain transmission device 541, and the structure of the second driving device 553 is the same as that of the first driving device 543, which is not repeated herein. Both ends of scraper 552 are also fixed to adjacent chains, and can move along with the movement of the chains, and one side of scraper 552 close to partition plate 52 is also abutted against partition plate 52, and can push away soil on partition plate 52 in the moving process.
Referring to fig. 1, in an embodiment, the exhaust gas treatment device 9 mainly comprises a heat exchanger 91 and an activated carbon adsorption tank 92, where the heat exchanger 91 is a tubular heat exchanger or a plate heat exchanger, and the two heat exchangers have two sets of input ends and output ends, and one set of the two sets of the input ends and the output ends is respectively connected to the two heating chambers 51 and the activated carbon adsorption tank 92, and is configured to send the gas containing organic pollutants flowing out of the heating chambers 51 into the activated carbon adsorption tank 92 for adsorption treatment. And the other group of input ends and the input ends are respectively connected with the fan and the preheating chamber 1 and are used for recovering heat, and the recovered heat is used for preheating the soil needing to be treated.
Further, the number of the activated carbon adsorption tanks 92 is increased to two or more, and a multi-channel valve 96 is added, and the multi-channel valve 96 connects the two heating chambers 51 with the plurality of activated carbon adsorption tanks 92, so that the gas flowing out of the heating chambers 51 can alternately enter the plurality of activated carbon adsorption tanks 92, thereby allowing sufficient time for maintenance personnel to replace the saturated activated carbon in the activated carbon adsorption tanks 92.
Referring to fig. 8, in an embodiment, the exhaust gas treatment device 9 is mainly composed of two parts, namely, a regenerative organic waste gas incinerator 93 and an exhaust gas pipe 94, wherein the exhaust gas pipe 94 connects the pyrolysis chamber 5 and the regenerative organic waste gas incinerator 93, and is used for introducing the gas containing organic matters into the regenerative organic waste gas incinerator 93 for combustion treatment.
The organic waste gas heat accumulating type incinerator 93 has two or three combustion chambers, a large number of heat accumulating bricks are stacked below each combustion chamber, and the combustion chambers work alternately, so that organic matters can be sufficiently combusted. Since the temperature for heating the soil in the heating chamber 51 is 300-400 deg.C, the temperature of the gas flowing out from the heating chamber 51 is also substantially maintained at this temperature or even lower, and the condition of sufficient combustion cannot be satisfied. When the organic waste gas regenerative incinerator 93 works, the temperature in the combustion chamber can be kept at 1000-1200 ℃, and when high-temperature gas flowing out of the combustion chamber flows through the regenerative bricks, heat exchange is carried out, so that the temperature of the regenerative bricks is increased. The gas flowing into the combustion chamber can also pass through a heat storage rotor, the temperature of the gas can be increased to 700-800 ℃, and the gas is combusted by the aid of a combustor. The organic waste gas regenerative incinerator 93 can fully utilize heat generated in the organic matter combustion process, and further reduce treatment energy consumption.
Further, a cyclone 95 is additionally installed at the junction of the regenerative waste air incinerator 93 and the waste air duct 94 to remove dust from the air. Because in the process of heating the soil, part of soil particles enter the organic waste gas regenerative incinerator 93 along with flowing gas, and the blockage phenomenon is easy to occur in the long-time use process. The cyclone dust collector 95 is used for dust removal, so that the dust removal requirement can be met, and excessive loss of flow velocity can not be caused.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (9)
1. An ectopic polluted soil remediation system for remediating organically-polluted soil, comprising:
a preheating chamber (1);
the input end of the vibrating screen classifier (2) is connected with the preheating chamber (1);
one end of the first pipeline (3) is connected with the vibrating screening machine (2), and the other end is connected with a three-way valve (4);
two heating decomposition chambers (5) which are respectively connected with the other two ends of the three-way valve (4);
the gate valve (6) is arranged at the joint of the heating decomposition chamber (5) and the three-way valve (4);
the input end of the grate cooler (7) is connected with the two heating decomposition chambers (4);
the input end of the heat return pipeline (8) is connected with the grate cooler (7), and the output end of the heat return pipeline is connected with the preheating chamber (1);
and the waste gas treatment device (9) is connected with the two heating decomposition chambers (5) and is used for treating organic matters generated in the pyrolysis process.
2. The contaminated soil ex-situ remediation system of claim 1, wherein: a waste heat pipeline (11) is arranged in the preheating chamber (1), and a waste heat air hole (12) is formed in the waste heat pipeline (11);
the waste heat pipelines (11) are uniformly distributed on the inner side of the bottom surface of the preheating chamber (1), and the waste heat air holes (12) face the bottom surface of the preheating chamber (1).
3. An ex-situ remediation system for contaminated soil according to claim 1, wherein said pyrolysis chamber (5) comprises:
a heating chamber (51);
a partition plate (52) provided in the heating chamber (51) and dividing the interior thereof into a first portion (511) and a second portion (522) located below the first portion (511);
a heater (53) disposed within the second portion (522);
a paving part (54) for paving the organic contaminated soil on the partition plate (52);
and the scraping part (55) is used for pushing away the organic contaminated soil on the partition plate (52).
4. An ex-situ remediation system for contaminated soil according to claim 3, wherein said paving section (54) comprises: a first chain transmission device (541) arranged in the first part (511), a material distribution funnel (542) arranged on the first chain transmission device (541), and a first driving device (543) arranged on the outer wall of the heating chamber (51) and used for the action of the first chain transmission device (541);
the cross-sectional area of the distribution funnel (542) tends to decrease in a direction approaching the partition (52).
5. An ex-situ remediation system for contaminated soil according to claim 3, wherein said scraper portion (55) comprises: a second chain transmission device (551) arranged in the first part (511), a scraper (552) arranged on the second chain transmission device (551) and a second driving device (553) arranged on the outer wall of the heating chamber (51) and used for the action of the second chain transmission device (551);
the scraper (552) abuts on the upper surface of the diaphragm (52).
6. The contaminated soil ex-situ remediation system of claim 3, wherein: the waste gas treatment device (9) comprises a heat exchanger (91) and an activated carbon adsorption tank (92) connected with the heat exchanger (91);
the preheating device is characterized by further comprising a heat return pipe (93), wherein two ends of the heat return pipe (93) are respectively connected with the heat exchanger (91) and the preheating chamber (1).
7. The contaminated soil ex-situ remediation system of claim 3, wherein: the waste gas treatment device (9) comprises a heat exchanger (91), a multi-channel valve (96) connected with the heat exchanger (91) and an activated carbon adsorption tank (92) connected with the multi-channel valve (96);
the activated carbon adsorption boxes (92) work alternately;
and two ends of the heat return pipeline (8) are respectively connected with the heat exchanger (91) and the preheating chamber (1).
8. The contaminated soil ex-situ remediation system of claim 3, wherein: the waste gas treatment device (9) comprises an organic waste gas regenerative incinerator (93) and a waste gas pipeline (94);
and two ends of the heat return pipeline (8) are respectively connected with the heating decomposition chamber (5) and the organic waste gas heat accumulating type incinerator (93).
9. The contaminated soil ex-situ remediation system of claim 7, wherein: and a cyclone dust collector (95) is arranged at the joint of the waste gas pipeline (94) and the organic waste gas heat accumulating type incinerator (93).
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| CN112620329A (en) * | 2020-11-30 | 2021-04-09 | 桂林电子科技大学 | Soil organic matter pollution treatment device |
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