CN214289999U - Fluidized bed type DBD plasma organic matter contaminated soil remediation system - Google Patents
Fluidized bed type DBD plasma organic matter contaminated soil remediation system Download PDFInfo
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- CN214289999U CN214289999U CN202022657310.4U CN202022657310U CN214289999U CN 214289999 U CN214289999 U CN 214289999U CN 202022657310 U CN202022657310 U CN 202022657310U CN 214289999 U CN214289999 U CN 214289999U
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Abstract
The utility model discloses a fluidized bed DBD plasma organic matter contaminated soil remediation system, which comprises a dryer, a ball mill crusher, a screw conveyor, a fluidized bed plasma reactor, a cyclone separator, a streamer plasma reactor and an electric dust removal reactor which are connected in sequence; the fluidized bed plasma reactor comprises a fluidized bed cavity, a fluidized bed top cover and a feeding bin arranged at the bottom of the fluidized bed cavity, wherein a storage bin is arranged at the bottom of the feeding bin; a plurality of DBD reaction tubes arranged in an array are arranged in the fluidized bed cavity; the feed inlet of the cyclone separator is connected with the air outlet on the top cover of the fluidized bed; the side wall of the feeding bin is provided with a soil feeding hole and a secondary feeding hole, and a discharging hole of the cyclone separator is connected with the secondary feeding hole; the air outlet at the upper part of the cyclone separator is connected with the streamer plasma reactor. Utilize the utility model discloses, solved current restoration process inefficiency, had secondary pollution scheduling problem, can be used to the large-scale restoration of industry and pollute soil.
Description
Technical Field
The utility model belongs to the technical field of organic contaminated soil remediation, concretely relates to fluidized bed formula DBD plasma organic matter pollutes soil repair system.
Background
With the rapid development of economy in China, the discharge of three wastes in the urban industry, the use of a large amount of chemical pesticides, the discharge of traffic tail gas and the incineration of urban garbage cause a large amount of persistent organic pollutants to enter soil and enter human bodies through a plant-soil system, thereby causing serious influence and great harm to the health of the human bodies. The pollution of persistent organic matters to soil is more and more important to people.
Persistent Organic Pollutants (POPs) refer to natural or artificially synthesized Organic substances having four important characteristics of bioaccumulation, environmental persistence, long-distance mobility and high toxicity. POPs can be roughly classified into organochlorine insecticides, industrial chemicals, and impurity derivatives in chemical production, such as dichlorodiphenyl, toxaphene, polychlorinated biphenyl, polychlorinated dibenzodioxin, hexachloro-hexa, and the like. Since it has a serious influence on human health, soil contaminated with persistent organic substances must be properly treated.
At present, the common repair technologies for POPs in soil mainly include a physical adsorption technology, a cement kiln technology, a photocatalytic oxidation technology, a microbial repair technology, a thermal incineration technology and the like, but the technologies only transfer pollutants or easily generate secondary pollution, and the pollution problem cannot be fundamentally solved.
Chinese patent publication No. CN102357521A discloses a method for continuous direct thermal desorption of persistent organic contaminated soil, in which the broken contaminated soil is continuously fed into a rotary thermal desorption device by a shaftless screw feeder, and the soil in the thermal desorption device directly contacts with hot flue gas generated by burning of a light oil burner to exchange heat, so as to volatilize persistent organic waste. The soil after thermal desorption treatment is continuously discharged by a rotary slag extractor after being sprayed with moisture and cooled. The thermal desorption gas is fully cracked and combusted in the secondary chamber at the high temperature of 1200 ℃, and is discharged after being purified by the flue gas treatment system to reach the standard.
The restoration method has the advantages of high efficiency and no secondary pollution, but has large energy consumption and high cost, and is not suitable for restoring polluted sites on a large scale.
SUMMERY OF THE UTILITY MODEL
The utility model provides a fluidized bed formula DBD plasma organic matter pollutes soil repair system has solved current repair technology inefficiency, has the secondary pollution scheduling problem, can be used to the industrial extensive restoration contaminated soil.
A fluidized bed type DBD plasma organic matter contaminated soil remediation system comprises a dryer, a ball milling pulverizer, a spiral conveyor, a fluidized bed plasma reactor, a cyclone separator, a streamer plasma reactor and an electric dust removal reactor which are connected in sequence;
the dryer is connected with the ball milling crusher through a conveyor belt; the fluidized bed plasma reactor comprises a fluidized bed cavity, a fluidized bed top cover arranged at the upper part of the fluidized bed cavity and a feeding bin arranged at the bottom of the fluidized bed cavity, wherein a storage bin is arranged at the bottom of the feeding bin; a plurality of DBD reaction tubes are arranged in the fluidized bed cavity in an array mode, and the DBD reaction tubes are parallel to a vertical airflow channel in the fluidized bed cavity;
the feed inlet of the cyclone separator is connected with an air outlet arranged on the top cover of the fluidized bed; the side wall of the feeding bin is provided with a soil feeding hole and a secondary feeding hole, and a discharging hole of the cyclone separator is connected with the secondary feeding hole; and an air outlet at the upper part of the cyclone separator is connected with the streamer plasma reactor.
The utility model discloses a processing object can be soil, but is not limited to soil, can be other particulate matters, dust etc..
Furthermore, a detachable stainless steel filter screen is arranged between the feeding bin and the storage bin of the fluidized bed plasma reactor.
Further, the bottom of the storage bin is provided with an air inlet, and the side wall of the storage bin is provided with a storage bin discharge hole; the air inlet of the storage bin is connected with a fan and is used for blowing the soil in the feeding bin to the cavity of the fluidized bed for reaction; the discharge port of the storage bin is connected with the storage tank.
Furthermore, a hopper is arranged above the spiral conveyor, and additives can be added to the hopper for synergistically repairing the polluted soil.
Further, the additives include four major types, such as reducing agents (zero-valent metals, metal hydrides, etc.), Lewis bases (alkalis, alkaline earth metal oxides), neutral substances (silica, alumina, etc.), oxidizing agents (persulfates, etc.).
Furthermore, the fluidized bed cavity is a barrel-shaped container, and the barrel wall of the fluidized bed cavity is made of stainless steel materials.
The DBD reaction tube consists of a high-voltage electrode, an insulating medium and a low-voltage electrode which are coaxially arranged; the high-voltage electrodes are arranged in the insulating medium, and the low-voltage electrodes are uniformly distributed on the periphery of the insulating medium in a hexagonal shape; the high-voltage electrode and the low-voltage electrode are made of metal materials, and the insulating medium is made of a ceramic medium. And blowing the soil to a fluidized state after the gas passes through a stainless steel filter screen, and treating the soil in the fluidized state by moving up and down in the DBD reaction tube.
Furthermore, the streamer plasma reactor adopts a wire barrel type structure, high-voltage electrodes in the streamer plasma reactor are made of metal materials, and the distance between wire barrels is about 10 cm.
Furthermore, the electric precipitation reactor is provided with three subareas which respectively correspond to the front end electric field, the middle end electric field and the tail end electric field; each electric field adopts a line plate type structure, the distance between line plates is 15cm, and each subarea adopts an independent negative high-voltage direct-current power supply; the front-end electric field is powered by high-voltage large current, and the tail-end electric field is powered by high-voltage small current.
The electric precipitation reactor is used for collecting the small-particle soil which can not be separated by the cyclone separator, and the outlet of the electric precipitation reactor is connected with the induced draft fan through a waste gas pipeline.
The repair process of the fluidized bed DBD plasma organic matter polluted soil repair system comprises the following steps:
(1) the dryer dries the polluted soil to be close to 105 ℃, removes the water absorbed in the soil, and then sends the soil into the ball milling crusher through a conveyor belt;
(2) grinding the dried soil to a particle size of less than 1mm by a ball mill pulverizer, and then conveying the ground soil into a fluidized bed plasma reactor for reaction by a screw conveyor;
(3) blowing the soil to be repaired to a fluidized state, allowing the soil to enter a DBD reaction pipe of a fluidized bed plasma reactor for degradation, allowing waste gas and soil carried in the waste gas to enter a cyclone separator, allowing soil particles with a slightly larger particle size to settle, allowing the waste gas to enter a secondary feed inlet of the fluidized bed plasma reactor through a discharge port of the cyclone separator, and allowing the soil particles which cannot be separated from the waste gas and the waste gas to be discharged into a streamer plasma reactor from a gas outlet of the cyclone separator;
(4) the streamer plasma reactor carries out secondary plasma treatment on the waste gas discharged by the cyclone separator, degrades part of the persistent organic waste gas released by soil desorption, and then the waste gas enters the electric precipitation reactor;
(5) collecting small-particle soil which cannot be separated by the cyclone separator by the electric precipitation reactor, and discharging purified waste gas into air;
(6) move away the stainless steel filter screen between feeding storehouse and the storage silo, soil after the processing can drop to the discharge gate, gets into the storage tank through the conveyer belt.
The utility model combines the fluidized bed and the low-temperature plasma together, which not only strengthens the mass transfer process, but also introduces active free radicals to accelerate the degradation of the polluted soil; the streamer plasma and the electric dust removal reactor jointly act on the waste gas generated by soil remediation, and the waste gas is purified to reach the discharge standard.
Drawings
FIG. 1 is a schematic structural diagram of a fluidized bed DBD plasma organic matter contaminated soil remediation system of the present invention;
fig. 2 is a schematic view of the structure of the fluidized bed plasma reactor of fig. 1.
In the figure: 1-a dryer; 2-ball milling pulverizer; 3-a hopper; 4-a screw conveyor; 5-fluidized bed plasma reactor; 6-a cyclone separator; 7-streamer plasma reactor; 8-electric dust removal reactor; 9-a fan; 10-a fan; 11-a material storage tank; 51-air outlet; 52-DBD reaction tube; 53-soil feed port; 54-secondary feed port; 55-stainless steel screen; 56-discharge hole; 57-air outlet; 521-high voltage electrode; 522-insulating medium; 523-Low Voltage electrode.
Detailed Description
The invention will be described in further detail with reference to the following figures and examples, which are intended to facilitate the understanding of the invention without limiting it.
As shown in fig. 1, a fluidized bed type DBD plasma organic matter contaminated soil remediation system comprises a dryer 1, a ball mill pulverizer 2, a screw conveyor 4, a fluidized bed plasma reactor 5, a cyclone separator 6, a streamer plasma reactor 7, an electric dust removal reactor 8 and a storage tank 11.
Among them, the dryer 1 is used to dry contaminated soil to approximately 105 ℃, and to remove moisture adsorbed in the soil.
The ball mill 2 is used for grinding the dried soil to a particle size of less than 1 mm.
A hopper 3 is arranged above the spiral conveyor 4, and additives can be added for synergistically repairing the polluted soil. The additive can be reducing agent (zero-valent metal, metal hydride, etc.), Lewis base (alkali, alkaline earth metal oxide), neutral substance (silicon dioxide, aluminum oxide, etc.), oxidant (persulfate, etc.), etc.
The fluidized bed plasma reactor 5 is made of stainless steel, as shown in fig. 2, the fluidized bed plasma reactor 5 comprises a fluidized bed cavity, a fluidized bed top cover arranged on the upper part of the fluidized bed cavity, and a feeding bin arranged at the bottom of the fluidized bed cavity, and the bottom of the feeding bin is provided with a storage bin.
The fluidized bed top cover is provided with an air outlet 51, the side wall of the feeding bin is respectively provided with a soil feeding hole 53 and a secondary feeding hole 54, the side wall of the storage bin is provided with a discharging hole 56, and the lower part of the storage bin is provided with an air inlet 57.
A movable stainless steel filter screen 55 is arranged between the feeding bin and the storage bin, the soil feeding port 53 and the secondary feeding port 54 are arranged above the stainless steel filter screen 55, the discharging port 56 is arranged below the stainless steel filter screen 55, the air inlet 57 is connected with the fan 10, the air blows the soil to a fluidized state after passing through the stainless steel filter screen 55, and a plurality of DBD reaction tubes 52 distributed in an array manner are arranged in the main body part (namely the fluidized bed cavity) in the fluidized bed plasma reactor 5.
The cyclone feed inlet 61 is connected with the gas outlet 51 of the fluidized bed plasma reactor 5, so as to separate the soil entrained in the waste gas, the soil particles with slightly larger particle size can settle down, the soil particles enter the secondary feed inlet 54 of the fluidized bed plasma reactor 5 through the discharge port 63 of the cyclone separator 6, and the soil particles which can not be separated from the waste gas and the waste gas are discharged from the gas outlet 62 of the cyclone separator 6.
The streamer plasma reactor 7 carries out secondary plasma treatment on the waste gas discharged from the air outlet 62 of the cyclone separator 6, and because the persistent organic matters have the characteristic of semi-volatility, the air flow movement can cause soil to carry out desorption reaction, and partial persistent organic matters are released.
The electric dust removal reactor 8 is used for collecting the small-particle soil which cannot be separated by the cyclone separator 6.
The storage tank 11 is connected with the discharge port 53 of the fluidized bed plasma reactor 5, and the stainless steel filter screen 55 is removed after the soil is treated, so that the soil is lowered to the discharge port 53 and enters the storage tank 11 through the conveyor belt.
Further, as shown in fig. 2, the DBD reaction tube 52 is a tube structure, the high voltage electrode 521 and the low voltage electrode 523 are made of metal materials, but the material is not limited to stainless steel, the insulating medium 522 is made of high performance ceramic material, the low voltage electrode 523 is uniformly distributed around the insulating medium 522 in a hexagonal shape, the DBD reaction tube 52 is parallel to the vertical gas flow channel formed by the gas inlet and the gas outlet, and the soil in a fluidized state moves up and down in the DBD reaction tube 52.
Further, the streamer plasma reactor 7 is of a bobbin type structure, and the high voltage electrode inside the streamer plasma reactor is made of a metal material, but the material is not limited to stainless steel, and the distance between bobbins is about 10 cm.
Further, the electric dust removal reactor 8 is of a small partition structure and is provided with three electric fields, each electric field is of a wire plate type structure, high-voltage electrodes in the electric field are made of metal materials, but the electric dust removal reactor is not limited to stainless steel materials, the distance between the wire plates is 15cm, the distance between the same poles of the high-voltage electrodes is 10cm, and each partition is provided with an independent negative high-voltage direct-current power supply. The front-end electric field is powered by high voltage and high current to collect most large particles, and the tail electric field is powered by high voltage and low current to prevent particles from rebounding due to turbulence caused by ionic wind.
Further, the outlet of the electric dust removal reactor 8 is connected with an induced draft fan 9 through a waste gas pipeline, and the purified waste gas is discharged into the air.
The working process of the utility model is as follows:
the method comprises the steps of firstly removing moisture from polluted soil through a dryer 1, enabling the polluted soil to enter a ball mill pulverizer 2 through a conveyor belt, grinding the soil with large particle size to the particle size smaller than 1mm, enabling the polluted soil to enter a screw conveyor 4, enabling an additive in a hopper 3 above the screw conveyor 4 to be added into the soil to play a role in cooperative remediation, enabling the polluted soil to be pushed into a soil feeding hole 53 through the screw conveyor 4, enabling the polluted soil to enter a fluidized bed plasma reactor 5, and starting reaction. The process is as follows: the fan 10 blows air into the fluidized bed plasma reactor 5 through the air inlet 57, the air blows soil to a fluidized state after passing through the stainless steel filter screen 55, the air enters the DBD reaction pipe 52 for degradation, the waste gas and the soil carried therein enter the cyclone separator 6 through the feed inlet 61 of the cyclone separator connected with the air outlet 51, soil particles with slightly larger particle sizes can be settled down and enter the secondary feed inlet 54 of the fluidized bed plasma reactor 5 through the discharge outlet 63 of the cyclone separator 6, and the soil particles which cannot be separated from the waste gas and the waste gas are discharged into the streamer plasma reactor 7 from the air outlet 63 of the cyclone separator 6; then, the waste gas discharged by the cyclone separator 6 is subjected to secondary plasma treatment by the streamer plasma reactor 7, and part of the persistent organic waste gas released by soil desorption is degraded; then the waste gas enters an electric precipitation reactor 8, small-particle soil which cannot be separated by the cyclone separator 6 is collected, the electric precipitation reactor 8 is connected with an induced draft fan 9, and the purified waste gas is discharged into the air; finally, the stainless steel screen 55 is removed and the treated soil is lowered to the discharge port 56 and passed through the conveyor belt into the storage tank 11.
The above-mentioned embodiment is to the technical solution and the beneficial effects of the present invention have been described in detail, it should be understood that the above is only the specific embodiment of the present invention, not used for limiting the present invention, any modification, supplement and equivalent replacement made within the principle scope of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A fluidized bed type DBD plasma organic matter contaminated soil remediation system is characterized by comprising a dryer, a ball milling pulverizer, a spiral conveyor, a fluidized bed plasma reactor, a cyclone separator, a streamer plasma reactor and an electric dust removal reactor which are connected in sequence;
the dryer is connected with the ball milling crusher through a conveyor belt; the fluidized bed plasma reactor comprises a fluidized bed cavity, a fluidized bed top cover arranged at the upper part of the fluidized bed cavity and a feeding bin arranged at the bottom of the fluidized bed cavity, wherein a storage bin is arranged at the bottom of the feeding bin; a plurality of DBD reaction tubes are arranged in the fluidized bed cavity in an array mode, and the DBD reaction tubes are parallel to the airflow channel in the fluidized bed cavity;
the feed inlet of the cyclone separator is connected with an air outlet arranged on the top cover of the fluidized bed; the side wall of the feeding bin is provided with a soil feeding hole and a secondary feeding hole, and a discharging hole of the cyclone separator is connected with the secondary feeding hole; and an air outlet at the upper part of the cyclone separator is connected with the streamer plasma reactor.
2. The fluidized bed type DBD plasma organic matter contaminated soil remediation system of claim 1, wherein a detachable stainless steel screen is arranged between the feed bin and the storage bin of the fluidized bed plasma reactor.
3. The fluidized bed type DBD plasma organic matter contaminated soil remediation system of claim 2, wherein the bottom of the storage bin is provided with an air inlet, and the side wall of the storage bin is provided with a storage bin discharge port; the air inlet of the storage bin is connected with a fan and is used for blowing the soil in the feeding bin to the cavity of the fluidized bed for reaction; the discharge port of the storage bin is connected with the storage tank.
4. The fluidized bed type DBD plasma organic matter contaminated soil remediation system of claim 1, wherein a hopper is provided above the screw conveyor.
5. The fluidized bed type DBD plasma organic matter contaminated soil remediation system of claim 1, wherein the fluidized bed chamber is a barrel-shaped vessel, and a wall of the barrel is made of stainless steel.
6. The fluidized bed type DBD plasma organic matter contaminated soil remediation system of claim 1, wherein the DBD reaction pipe is composed of a high voltage electrode, an insulating medium and a low voltage electrode which are coaxially arranged; the high-voltage electrodes are arranged in the insulating medium, and the low-voltage electrodes are uniformly distributed on the periphery of the insulating medium in a hexagonal shape; the high-voltage electrode and the low-voltage electrode are made of metal materials, and the insulating medium is made of a ceramic medium.
7. The fluidized bed type DBD plasma organic matter contaminated soil remediation system of claim 1, wherein the streamer plasma reactor is of a bobbin type structure, high voltage electrodes in the streamer plasma reactor are made of metal materials, and the distance between bobbins is about 10 cm.
8. The fluidized bed type DBD plasma organic matter contaminated soil remediation system of claim 1, wherein the electric dust removal reactor is provided with three zones, corresponding to the front end, the middle end and the tail end of the electric field respectively; each electric field adopts a line board type structure, the distance between line boards is 15cm, and each subarea adopts an independent negative high-voltage direct-current power supply.
9. The fluidized bed type DBD plasma organic matter contaminated soil remediation system of claim 1, wherein an outlet of the electric dust removal reactor is connected with an induced draft fan through an exhaust gas line.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112355045A (en) * | 2020-11-17 | 2021-02-12 | 浙江大学 | Fluidized bed type DBD plasma organic matter contaminated soil remediation system and process |
| CN115318818A (en) * | 2022-07-15 | 2022-11-11 | 上海化工院环境工程有限公司 | Multifunctional multi-mode integrated soil ex-situ remediation system and method |
-
2020
- 2020-11-17 CN CN202022657310.4U patent/CN214289999U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112355045A (en) * | 2020-11-17 | 2021-02-12 | 浙江大学 | Fluidized bed type DBD plasma organic matter contaminated soil remediation system and process |
| CN115318818A (en) * | 2022-07-15 | 2022-11-11 | 上海化工院环境工程有限公司 | Multifunctional multi-mode integrated soil ex-situ remediation system and method |
| CN115318818B (en) * | 2022-07-15 | 2024-03-26 | 上海化工院环境工程有限公司 | Multifunctional multi-mode integrated soil ex-situ remediation system and method |
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