CN107983765B - Organic contaminated soil remediation system and process - Google Patents
Organic contaminated soil remediation system and process Download PDFInfo
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- CN107983765B CN107983765B CN201711374318.6A CN201711374318A CN107983765B CN 107983765 B CN107983765 B CN 107983765B CN 201711374318 A CN201711374318 A CN 201711374318A CN 107983765 B CN107983765 B CN 107983765B
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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
- B09C1/08—Reclamation of contaminated soil chemically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/023—Pockets filters, i.e. multiple bag filters mounted on a common frame
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
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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
- B09C1/065—Reclamation of contaminated soil thermally by pyrolysis
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Abstract
The invention provides a system and a process for repairing organic contaminated soil. The organic contaminated soil remediation system comprises a feeding tank, a fluidized bed reactor, a hot air blower, a purified soil discharging tank and a tail gas treatment device. The hot air blower is communicated with an air inlet of a gas distribution chamber arranged on one side of the bottom of the fluidized bed reactor. The feeding tank closes on the feed inlet setting of fluidized bed reactor top one side, the gas distribution room with the feed inlet is relative, purify soil discharge tank with the discharge gate intercommunication that fluidized bed reactor bottom one side set up, tail gas processing apparatus with fluidized bed reactor top one side sets up gas outlet and connects. Through the scheme, reverse feeding is realized, the starting pressure drop is reduced, quick and efficient repair of the soil to be repaired can be completed, and the method has a wide application value.
Description
Technical Field
The invention relates to the technical field of soil remediation, in particular to a system and a process for remediating organic contaminated soil.
Background
With the rapid growth of economy, environmental pollution is also coming. The increasing environmental pollution poses serious threats to human survival. Especially, the pollution of the soil directly influences the normal life of people. The soil remediation industry is in force to coordinate economic growth with soil protection. The method has good development prospect, currently, the soil remediation industry in China is in the primary stage, the rapid development of the soil remediation industry will be met in the next 10 years, and the market is huge. Currently, the polluted soil remediation technology is researched for many years in developed countries such as Europe and America, and the technology for remedying the soil polluted by volatile organic pollutants mainly comprises the technologies of gas phase extraction (SVE), soil washing/leaching, rotary kiln thermal desorption, monitoring type natural attenuation (MNA), oxidation reduction, microbial remediation and the like.
However, the methods all have the disadvantages, such as higher requirement on soil permeability by the vapor extraction technology and trailing effect in the later removal period; the washing/leaching agent and the soil after the soil washing/leaching technology treatment need further treatment, the process requirement is high, and the possibility of washing/leaching secondary pollution exists; the heat energy utilization rate of the rotary kiln thermal desorption technology is low, the soil and hot air are difficult to be quickly, efficiently and uniformly mixed, and the organic polluted soil is easy to be blocked in the rotary kiln; the oxidation-reduction technology may have secondary pollution and higher cost; technologies such as monitoring type natural attenuation (MNA), Biological Ventilation (BV) and Permeable Reactive Barrier (PRB) based on microbial remediation have the problems of high requirement on environmental parameter processing, long processing time and the like.
Therefore, there is a need to develop a revolutionary new and sophisticated technology to provide a fast and efficient treatment and remediation method for organic contaminated soil.
Disclosure of Invention
The invention aims to provide a system and a process for repairing organic contaminated soil, which are used for improving the problems.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:
in a first aspect, an embodiment of the present invention provides an organic contaminated soil remediation system, where the organic contaminated soil remediation system includes a feeding tank, a fluidized bed reactor, a hot air blower, a purified soil discharging tank, and a tail gas treatment device, where the hot air blower is communicated with an air inlet of a gas distribution chamber arranged on one side of the bottom of the fluidized bed reactor; the feeding tank is arranged close to a feeding hole on one side of the top of the fluidized bed reactor, the gas distribution chamber is opposite to the feeding hole, the purified soil discharging tank is communicated with a discharging hole arranged on one side of the bottom of the fluidized bed reactor, and the tail gas treatment device is connected with a gas outlet arranged on one side of the top of the fluidized bed reactor; hot air generated by the hot air blower enters the fluidized bed reactor through the gas distribution chamber so as to adjust gas in the fluidized bed reactor into fluidized air meeting preset conditions; the feeding tank is used for feeding soil to be repaired into the fluidized bed reactor from the feeding hole so as to enable the soil to be repaired to be in contact with and react with the fluidized air, and the repaired soil and the organic pollution gas are separated; the purified soil discharge tank receives the restored soil settled at the bottom of the fluidized bed reactor; and the tail gas treatment device receives and treats the organic pollution gas.
Furthermore, the fluidized bed reactor also comprises a shell, a reactor inner cylinder and an air locking feeding chamber, wherein the gas distribution chamber and the air locking feeding chamber are arranged in the shell, the gas distribution chamber is arranged at the bottom of the shell, the air locking feeding chamber is arranged at the top of the shell, the gas distribution chamber is opposite to the air locking feeding chamber, the reactor inner cylinder is vertically arranged in the shell, one end opening of the reactor inner cylinder is connected with an air outlet of the gas distribution chamber, the other end opening of the reactor inner cylinder faces a feeding port of the air locking feeding chamber, a feeding port of the air locking feeding chamber is superposed with the feeding port, a soil receiving tank is formed between the shell and the side wall of the reactor inner cylinder, and the purified soil discharging tank is communicated with the soil receiving tank through the discharging port; hot air generated by the hot air blower enters the reactor inner barrel through the gas distribution chamber so as to adjust gas in the reactor inner barrel into the fluidizing air meeting the preset conditions, wherein the corresponding temperature of the fluidizing air meeting the preset conditions is between 100 and 500 ℃, and the corresponding fluidizing speed is between 0.1 and 2.5 m/s; uniformly throwing the soil to be repaired, which is received and thrown by the feeding tank, into the inner cylinder of the reactor through a flap feeding valve of the air locking feeding chamber, and contacting and reacting with the fluidizing air; the soil receiving tank receives the remediating soil separated from the soil to be remediated.
Further, the organic contaminated soil remediation system further comprises a hot air buffer tank, wherein the hot air buffer tank is arranged between the gas distribution chamber and the air heater so as to communicate the gas distribution chamber with the air heater.
Further, the air outlet of the gas distribution chamber is provided with a distribution plate for preventing the gas distribution chamber from being blocked.
Furthermore, a plurality of inner baffles are arranged on the inner side wall of the top of the shell and the outer side wall of the air locking feeding chamber, and the plate bodies of the inner baffles are opposite to the notches of the soil receiving grooves.
Furthermore, a preset included angle is formed between the plate body of the inner baffle and the horizontal plane, and the free end of the inner baffle faces the bottom of the shell.
Furthermore, the organic contaminated soil remediation system further comprises an air locking discharge valve, wherein the air locking discharge valve is arranged between the purified soil discharge tank and the discharge port and is used for controlling the connection or disconnection of a channel between the purified soil discharge tank and the discharge port.
Further, the tail gas treatment device comprises a bag-type dust remover and a tail gas purification box, and the gas outlet, the bag-type dust remover and the tail gas purification box are sequentially connected.
In a second aspect, an embodiment of the present invention provides an organic contaminated soil remediation process using the aforementioned organic contaminated soil remediation system, including the following steps: starting the hot air blower to adjust the gas in the fluidized bed reactor to be stable fluidizing air meeting the preset conditions; the feeding tank is used for feeding soil to be repaired into the fluidized bed reactor from the feeding hole so as to enable the soil to be repaired to be in contact with and react with the fluidized air, and the repaired soil and the organic pollution gas are separated; the purified soil discharge tank receives the restored soil settled at the bottom of the fluidized bed reactor; and the tail gas treatment device receives and treats the organic pollution gas.
Compared with the prior art, the organic contaminated soil remediation system and the process provided by the invention are provided. The soil to be repaired is put into the fluidized bed reactor from the feeding hole by the feeding tank, and is contacted and reacted with the fluidized air so as to separate out the repaired soil and the organic polluted gas, the process is rapid, the soil is fully contacted with the fluidized air, and the soil and the pollutants are conveniently and efficiently separated. Through the mode of feeding from the upper end of the fluidized bed reactor and blowing hot air from the lower end of the fluidized bed reactor, the lifting, conveying and fluidization of soil are easier to realize through the reverse feeding, the starting pressure drop is reduced, and the resistance drop is smaller. The purified soil discharging tank receives the restored soil settled at the bottom of the fluidized bed reactor, gas-solid fluidization dilute phase conveying is not needed, and the processing load of a fluidized wind and tail gas processing system is reduced. The tail gas treatment device receives and treats the organic polluted gas, and the pollutants are placed to be discharged at will, so that the environment is influenced. The repair process is quick and efficient, and has wide application value.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram illustrating an organic contaminated soil remediation system according to a preferred embodiment of the present invention.
FIG. 2 is a schematic sectional view along II-II of the organic contaminated soil remediation system shown in FIG. 1.
Fig. 3 is a flow chart illustrating the steps of the organic contaminated soil remediation process according to a preferred embodiment of the present invention.
Icon: 100-an organic contaminated soil remediation system; 10-a feed tank; 20-a fluidized bed reactor; 21-a gas distribution chamber; 211-a distribution plate; 22-air locking feeding chamber; 221-a feeding port; 222-a feed port; 23-a housing; 24-inner barrel of reactor; 25-a soil receiving tank; 26-an inner baffle; 30-a hot air blower; 40-a purified soil discharge tank; 50-a tail gas treatment device; 51-bag dust collector; 52-tail gas purifying box; 60-hot air buffer tank; 70-air locking discharge valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
First embodiment
Referring to fig. 1 and fig. 2, an organic contaminated soil remediation system 100 according to an embodiment of the present invention is provided. The organic contaminated soil remediation system 100 includes a feeding tank 10, a fluidized bed reactor 20, a hot air blower 30, a purified soil discharging tank 40 and a tail gas treatment device 50, wherein the hot air blower 30, the purified soil discharging tank 40 and the tail gas treatment device 50 are respectively connected with the fluidized bed reactor 20. The feed tank 10 is disposed adjacent to the fluidized bed reactor 20.
In the embodiment of the present invention, the hot air blower 30 is communicated with the air inlet of the gas distribution chamber 21 disposed at one side of the bottom of the fluidized bed reactor 20. Hot air generated by the hot air blower 30 enters the fluidized bed reactor 20 through the gas distribution chamber 21, so that the gas in the fluidized bed reactor 20 is adjusted to be fluidized air satisfying predetermined conditions.
Further, the organic contaminated soil remediation system 100 further includes a hot air buffer tank 60. The hot air buffer tank 60 is disposed between the air distribution chamber 21 and the hot air blower 30 to communicate the air distribution chamber 21 and the hot air blower 30. The hot air generated by the hot air blower 30 is collected in the hot air buffer tank 60 before being stabilized, and the stabilized fluidized air enters the gas distribution chamber 21 from the hot air buffer tank 60. The outlet of the gas distribution chamber 21 is provided with a distribution plate 211 for preventing the gas distribution chamber 21 from being blocked.
In the embodiment of the present invention, the feeding tank 10 is disposed adjacent to the feeding port on the top side of the fluidized bed reactor 20. The gas distribution chamber 21 is opposite to the feed opening.
Further, the fluidized bed reactor 20 further comprises a airlock feeding chamber 22. The airlock feeding chamber 22 is disposed at a top side of the fluidized bed reactor 20 opposite to the gas distribution chamber 21. The material inlet 221 of the air-locking material inlet chamber 22 coincides with the material inlet, and the material inlet 222 of the air-locking material inlet chamber 22 faces the air outlet of the gas distribution chamber 21.
The feeding tank 10 feeds the soil to be restored into the air-lock feeding chamber 22 from the feeding port on one side of the top of the fluidized bed reactor 20, and then the soil to be restored is uniformly fed toward the air outlet side of the gas distribution chamber 21 by the flap feeding valve of the air-lock feeding chamber 22. The fluidizing air blown from the hot air buffer tank 60 satisfying the preset condition enters the fluidized-bed reactor 20 from the bottom side of the fluidized-bed reactor 20 and is directed toward the material inlet 222 of the airlock feeding chamber 22. Through the reverse feeding, the lifting and conveying of the soil are easier to realize, and the starting pressure drop is reduced. The soil to be repaired and the fluidized air are fully mixed in the fluidized bed reactor 20 in the reverse direction, so that a gas-solid fluidized state can be realized, and the soil particles to be repaired and the fluidized air are violently collided, rubbed and rolled in the fluidized bed reactor 20, so that high-efficiency momentum transfer, heat transfer, mass transfer and physical and chemical reactions are realized, and therefore organic pollutants in the soil are desorbed and removed, and the soil to be repaired is purified.
In the embodiment of the present invention, the purified soil discharging tank 40 is communicated with a discharging hole formed at one side of the bottom of the fluidized bed reactor 20. Further, the organic contaminated soil remediation system 100 further comprises an air-lock discharge valve 70. The air locking discharge valve 70 is arranged between the purified soil discharge tank 40 and the discharge port, and is used for controlling the connection or disconnection of a channel between the purified soil discharge tank 40 and the discharge port.
It should be noted that the air-lock feeding chamber 22 and the air-lock discharging valve 70 ensure the tightness of the whole fluidized bed reactor 20, no release and escape of atmospheric pollutants, and avoid odor volatilization to disturb people.
In the embodiment of the present invention, the tail gas treatment device 50 is connected to a gas outlet disposed at one side of the top of the fluidized bed reactor 20. The gas outlet is far away from the feed inlet. The tail gas treatment device 50 comprises a bag-type dust remover 51 and a tail gas purification box 52, and the gas outlet, the bag-type dust remover 51 and the tail gas purification box 52 are sequentially connected. The tail gas purifying box 52 removes organic matters in the tail gas through activated carbon or plasma technology, so that the organic pollution gas separated from the soil to be repaired is discharged after reaching the standard after being treated.
In the embodiment of the present invention, the fluidized bed reactor 20 further includes a housing 23 and a reactor inner barrel 24. Gas distribution room 21 and lock wind feed chamber 22 all set up in the casing 23, gas distribution room 21 set up in the bottom of casing 23, lock wind feed chamber 22 set up in the top of casing 23, gas distribution room 21 with lock wind feed chamber 22 is relative, reactor inner tube 24 vertically set up in the casing 23, reactor inner tube 24's one end opening with the air outlet of gas distribution room 21 is connected, other end opening orientation lock wind feed chamber 22's dog-house 222. Fluidizing air which is blown in from the gas distribution chamber 21 and meets the preset requirement enters the inner barrel 24 of the reactor from the lower end of the inner barrel 24 of the reactor, so that the gas in the inner barrel 24 of the reactor is adjusted to meet the fluidizing air of the preset condition, wherein the corresponding temperature of the fluidizing air which meets the preset condition is between 100 and 500 ℃, and the corresponding fluidizing speed is between 0.1 and 2.5 m/s. The soil to be repaired enters the reactor inner barrel 24 from the upper end of the reactor inner barrel 24 through the air locking feeding chamber 22 from the feeding tank 10, and contacts and reacts with the fluidizing air. Specifically, the soil to be repaired and the fluidized air are reversely met, contacted and fully mixed, so that a gas-solid fluidized state can be realized, and the soil particles to be repaired and the fluidized air are violently collided, rubbed and rolled in the fluidized bed reactor 20, so that efficient momentum transfer, heat transfer, mass transfer and physicochemical reaction are realized.
A soil receiving groove 25 is formed between the housing 23 and the sidewall of the reactor inner tube 24. Specifically, the inner diameter of the housing 23 is larger than that of the reactor inner cylinder 24, and the distance between the reactor inner cylinder 24 and the housing 23 is uniform to form an annular soil receiving groove 25. The soil receiving groove 25 receives the remediated soil separated from the soil to be remediated. The purified soil discharging tank 40 is communicated with the soil receiving tank 25 through the discharging hole. Further, a plurality of inner baffles 26 are arranged on the inner side wall of the top of the shell 23 and the outer side wall of the airlock feeding chamber 22, and the plates of the inner baffles 26 are opposite to the notches of the soil receiving grooves 25. A preset included angle is formed between the plate body of the inner baffle plate 26 and the horizontal plane, and the free end of the inner baffle plate 26 faces the bottom of the shell 23. The internal baffle 26 helps the separated remediated soil to settle around the reactor inner drum 24 and into the soil receiving trough 25. The restored soil is discharged from the lower end of the fluidized bed reactor 20 after being settled by the inner baffle 26, and a gas-solid fluidized dilute phase is not required to be conveyed from the upper end of the fluidized bed reactor 20, so that the processing load of a fluidized wind and tail gas processing system is reduced.
Referring to fig. 3, an embodiment of the present invention further provides an organic contaminated soil remediation process using the organic contaminated soil remediation system 100 in this embodiment, including the following steps:
step S101, the hot air blower 30 is started to adjust the gas in the fluidized bed reactor 20 to be stable fluidizing air satisfying a predetermined condition.
Specifically, the hot air blower 30 generates hot air to be converged in the hot air buffer tank 60 and form stable fluidizing air meeting the preset conditions, and the fluidizing air enters the reactor inner barrel 24 of the fluidized bed reactor 20 through the gas distribution chamber 21 so as to adjust the gas in the reactor inner barrel 24 to the fluidizing air meeting the preset conditions. Optionally, the temperature corresponding to the fluidizing air meeting the predetermined condition is 100-500 ℃, and the corresponding temperature is determined in the temperature interval according to the difference of the organic pollutants corresponding to the treated soil to be repaired. The fluidizing air may have a corresponding fluidizing velocity of between 0.1m/s and 2.5 m/s. Preferably, the corresponding fluidization velocity may be between 0.5m/s and 1.5 m/s.
Step S102, the feeding tank 10 puts the soil to be repaired into the fluidized bed reactor 20 from the feeding hole, so that the soil to be repaired is contacted and reacted with the fluidized air, and the repaired soil and the organic polluted gas are separated. The soil to be repaired enters the reactor inner barrel 24 from the upper end of the reactor inner barrel 24 through the air locking feeding chamber 22 from the feeding tank 10, and contacts and reacts with the fluidizing air.
Specifically, the soil to be repaired and the fluidized air are reversely met, contacted and fully mixed, so that a gas-solid fluidized state can be realized, the soil particles to be repaired and the fluidized air are violently collided, rubbed and rolled in the fluidized bed reactor 20, and efficient momentum transfer, heat transfer, mass transfer and physicochemical reaction are realized, so that organic pollutants are separated from the soil.
In the embodiment of the invention, the corresponding water content of the soil to be repaired is lower than 20%, and the corresponding soil particle size is lower than 10 mm.
In step S103, the purified soil discharging tank 40 receives the remediated soil settled at the bottom of the fluidized bed reactor 20.
Step S104, the tail gas treatment device 50 receives and treats the organic pollution gas.
In the embodiment of the present invention, a small amount of soil dust enters the bag-type dust collector 51 along with the organic pollution gas, and the soil dust intercepted by the bag-type dust collector 51 is subjected to secondary pollution by the organic pollution gas in the transmission process. Therefore, the soil can be treated in a mode of spraying an oxidant to reach the standard, and finally, the soil is mixed with the restored soil in the purified soil discharging tank 40 and then is subjected to water replenishing and backfilling.
In summary, the system and the process for remedying the organic contaminated soil provided by the embodiment of the invention have at least the following advantages:
(1) the mode that organic contaminated soil is fed from the upper end of the fluidized bed reactor and hot air is blown from the lower end of the fluidized bed reactor is adopted, and through the reverse feeding, the lifting, conveying and fluidization of the soil are easier to realize, the starting pressure drop is reduced, and the resistance drop is smaller.
(2) The repaired soil is discharged from the lower end of the fluidized bed reactor after being settled by the aid of the inner baffle, subsequent gas-solid fluidized dilute phase conveying is not needed, and the treatment load of a fluidized wind and tail gas treatment system is reduced.
(3) The method is carried out in a completely sealed environment to finish the removal and degradation of organic pollutants in the soil, and an air locking material valve is adopted, so that the release and escape of atmospheric pollutants are avoided, and the smell volatilization and disturbance to residents can be avoided.
(4) The reverse fluidized bed efficient repair technology has the advantages of strong operability, adoption of standard equipment, controllable repair period, wide pollutant treatment range and low influence of climate change.
(5) The soil to be repaired is fully mixed with the fluidized air reversely, the organic polluted soil is in a fluidized state, and high-efficiency momentum transfer, heat transfer, mass transfer and physical and chemical reactions can be realized, so that organic pollutants in the soil are desorbed and removed, and the pollutant removal and heat energy utilization rate is high.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. The organic contaminated soil remediation system is characterized by comprising a feeding tank, a fluidized bed reactor, a hot air blower, a purified soil discharging tank and a tail gas treatment device, wherein the hot air blower is communicated with an air inlet of a gas distribution chamber arranged on one side of the bottom of the fluidized bed reactor; the feeding tank is arranged close to a feeding hole on one side of the top of the fluidized bed reactor, the gas distribution chamber is opposite to the feeding hole, the purified soil discharging tank is communicated with a discharging hole arranged on one side of the bottom of the fluidized bed reactor, and the tail gas treatment device is connected with a gas outlet arranged on one side of the top of the fluidized bed reactor; the fluidized bed reactor also comprises a shell, a reactor inner cylinder and an air locking feeding chamber, wherein the gas distribution chamber and the air locking feeding chamber are arranged in the shell, the gas distribution chamber is arranged at the bottom of the shell, the air locking feeding chamber is arranged at the top of the shell, the gas distribution chamber is opposite to the air locking feeding chamber, the reactor inner cylinder is vertically arranged in the shell, one end of the reactor inner cylinder is provided with an opening which is connected with an air outlet of the gas distribution chamber, the other end of the reactor inner cylinder is provided with an opening which faces a feeding port of the air locking feeding chamber, a feeding port of the air locking feeding chamber is superposed with the feeding port, a soil receiving tank is formed between the shell and the side wall of the reactor inner cylinder, and the purified soil discharging tank is communicated with the soil receiving tank through a discharging port;
hot air generated by the hot air blower enters the fluidized bed reactor through the gas distribution chamber so as to adjust gas in the fluidized bed reactor into fluidized air meeting preset conditions; wherein the temperature corresponding to the fluidizing air meeting the preset conditions is between 100 and 500 ℃ and the corresponding fluidizing speed is between 0.1 and 2.5 m/s; uniformly throwing the soil to be repaired, which is received and thrown by the feeding tank, into the inner cylinder of the reactor through a flap feeding valve of the air locking feeding chamber, and contacting and reacting with the fluidizing air; the soil receiving tank receives the remediation soil separated from the soil to be remediated;
the feeding tank is used for feeding soil to be repaired into the fluidized bed reactor from the feeding hole so as to enable the soil to be repaired to be in contact with and react with the fluidized air, and the repaired soil and the organic pollution gas are separated;
the purified soil discharge tank receives the restored soil settled at the bottom of the fluidized bed reactor;
and the tail gas treatment device receives and treats the organic pollution gas.
2. The organic contaminated soil remediation system of claim 1 further comprising a hot air buffer tank disposed between the gas distribution chamber and the air heater to communicate the gas distribution chamber with the air heater.
3. The organic contaminated soil remediation system of claim 1 wherein the outlet of the gas distribution chamber is provided with a distribution plate for preventing the gas distribution chamber from becoming blocked.
4. The organically-polluted soil remediation system of claim 1 wherein the interior side wall of the top of the housing and the exterior side wall of the airlock feed chamber are provided with a plurality of internal baffles, the plates of the internal baffles being opposite the slots of the soil-receiving trough.
5. The organically-polluted soil remediation system of claim 4 wherein the plate body of the inner baffle forms a predetermined angle with the horizontal plane, and the free end of the inner baffle faces the bottom of the housing.
6. The organically-polluted soil remediation system as claimed in any one of claims 1 to 5, further comprising an airlock discharge valve disposed between the clean soil discharge tank and the discharge port for controlling communication or disconnection of the passage between the clean soil discharge tank and the discharge port.
7. The organic contaminated soil remediation system of claim 1 wherein the tail gas treatment device comprises a bag-type dust collector and a tail gas purification tank, the gas outlet, the bag-type dust collector and the tail gas purification tank being connected in series.
8. An organic contaminated soil remediation process using the organic contaminated soil remediation system of any one of claims 1 to 7, comprising the steps of:
starting the hot air blower to adjust the gas in the fluidized bed reactor to be stable fluidizing air meeting the preset conditions;
the feeding tank is used for feeding soil to be repaired into the fluidized bed reactor from the feeding hole so as to enable the soil to be repaired to be in contact with and react with the fluidized air, and the repaired soil and the organic pollution gas are separated;
the purified soil discharge tank receives the restored soil settled at the bottom of the fluidized bed reactor;
and the tail gas treatment device receives and treats the organic pollution gas.
9. The remediation process for organically-polluted soil according to claim 8, wherein the stable fluidizing air under the predetermined condition corresponds to a temperature of 100 to 500 ℃ and a fluidizing velocity of 0.1 to 2.5 m/s; the corresponding water content of the soil to be repaired is lower than 20%, and the corresponding soil particle size is lower than 10 mm.
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| CN108526214A (en) * | 2018-05-28 | 2018-09-14 | 上海龙净环保科技工程有限公司 | Heterogeneous oxidation soil remediation method and system |
| CN108856277A (en) * | 2018-06-29 | 2018-11-23 | 芜湖等莱智能科技有限公司 | A kind of contaminated soil remediation experimental provision |
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| 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 |
| 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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| US6773581B2 (en) * | 2001-10-18 | 2004-08-10 | General Atomics | System and method for solids transport in hydrothermal processes |
| CN102527711B (en) * | 2012-03-02 | 2013-05-08 | 武汉都市环保工程技术股份有限公司 | Movable type contaminated soil remediation system adopting recirculating fluidized bed |
| CN104438308B (en) * | 2013-09-22 | 2017-02-08 | 重庆文理学院 | Radial flow type inner circulation fluidized bed soil heavy metal elution apparatus |
| CN103979604B (en) * | 2014-05-29 | 2017-01-04 | 重庆大学 | The inner circulation fluidized device and method preparing titanium tetrachloride of a kind of vibration type |
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Effective date of registration: 20210701 Address after: 100000 22 Chaoyangmen North Street, Chaoyang District, Beijing. Patentee after: China Petroleum & Chemical Corp. Patentee after: Sinopec Engineering (Group) Co.,Ltd. Address before: 100000, No. 6, Xin Xin Street East, Beijing, Chaoyang District Patentee before: Sinopec Engineering (Group) Co.,Ltd. |