CN108480375B - In-situ thermal desorption-oxidation repair system and repair method for organic polluted site - Google Patents
In-situ thermal desorption-oxidation repair system and repair method for organic polluted site Download PDFInfo
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- CN108480375B CN108480375B CN201810293902.7A CN201810293902A CN108480375B CN 108480375 B CN108480375 B CN 108480375B CN 201810293902 A CN201810293902 A CN 201810293902A CN 108480375 B CN108480375 B CN 108480375B
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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
- B09C1/005—Extraction of vapours or gases using vacuum or venting
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8678—Removing components of undefined structure
- B01D53/8687—Organic components
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
- B01D2251/102—Oxygen
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
Abstract
The system and the method can effectively solve the key problem of mutual control among air inflow, temperature and tail gas emission, ensure the stable control of the flow and the temperature in the operation process of the system, realize the automatic, efficient, energy-saving, continuous and stable control of the in-situ thermal desorption-oxidation process, and ensure the continuous, energy-saving and efficient removal of the organic pollutants in the polluted site.
Description
Technical Field
The invention relates to the technical field of remediation of organic contaminated soil and underground water, in particular to an in-situ thermal desorption-oxidation remediation system and a remediation method for an organic contaminated site.
Background
The in-situ thermal desorption technology is a common restoration method for treating organic pollution sites of industrial enterprises. The thermal desorption technology is a technology for directly heating polluted soil, heating volatile and semi-volatile pollutants in the soil to be above a boiling point, improving saturated vapor pressure of the pollutants to volatilize the pollutants from the surface of the soil or soil gaps, and then treating gas-phase pollutants entering a gas phase. The technology has good treatment effect, little damage to soil, simple and easy operation of operating equipment, but high energy consumption, and needs to further treat volatilized organic matters.
The in-situ chemical oxidation repairing technology is mainly characterized in that an oxidant with strong oxidizing capability is added to convert pollutants in soil or underground water into substances with no toxicity or relatively low toxicity. Common oxidants include permanganate, hydrogen peroxide, fenton's reagent, persulfate, and ozone. The technology has the advantages of high repair speed, wide application range, large consumption, low medicament transmission rate in an area with poor permeability, and possible adverse effects of heat generation, gas generation and the like.
Due to the problems of complexity of geological conditions of a polluted site, properties of volatile organic pollutants, uneven distribution of pollutants in soil and the like, a single restoration technology cannot achieve an expected restoration target, and the demand of a combined restoration technology is particularly urgent. The combination of the in-situ thermal desorption technology and the chemical oxidation technology can effectively enhance the removal of the organic pollutants in the field. However, how to realize mutual control of air intake, temperature, exhaust emission and the like in the operation process of the in-situ thermal desorption-oxidation system is a key problem to be solved urgently by the system.
Disclosure of Invention
In view of the above, the present invention is directed to an in-situ thermal desorption-oxidation remediation system and a remediation method for an organic contaminated site, so as to at least partially solve at least one of the above-mentioned technical problems.
In order to achieve the purpose, the technical scheme of the invention is as follows:
as one aspect of the present invention, there is provided an in-situ thermal desorption-oxidation remediation method for an organic contaminated site, comprising the steps of:
(1) blowing heated air into the heating well through a blowing device, wherein the initial flow rate Q of the heated air1The heating well enters the polluted soil of the organic polluted site to carry out thermal desorption of organic pollutants, and the organic polluted gas generated by thermal desorption is pumped out through the pumping device to form a flow Q2Pumping out from the extraction well;
(2) the organic pollution gas and oxygen are sent into a thermal catalytic oxidation reaction chamber for catalytic oxidation and tail gas is produced, wherein the oxygenFlow rate Q3Adjusting according to the concentration of the organic pollutants and the flow of the organic polluted gas monitored in real time;
(3) monitoring the concentration of organic pollutants in the tail gas in real time, and if the concentration of the organic pollutants reaches the emission standard, emptying the tail gas; if the concentration data of the organic pollutants do not reach the emission standard, injecting the tail gas back into the heating well, and controlling the flow Q of the tail gas injected back into the heating well4Monitoring is carried out;
(4) if the tail gas is reinjected into the heating well, judging the tail gas flow Q reinjected into the heating well4Whether or not the initial flow rate Q of heated air is exceeded1If Q is4Greater than or equal to Q1If the flow rate of the heated air generated by the air blowing device is Q, the air blowing device is turned off, otherwise, the air blowing device is adjusted to operate1And Q4A difference of (d);
(5) and (3) if the concentration data of the organic pollutants in the organic pollutant gas and the tail gas reach the emission standard, completing the in-situ thermal desorption-oxidation remediation of the organic pollution site, and otherwise, continuing the flow from the step (1) to the step (4).
Preferably, in step (1), the method further comprises the step of adjusting the temperature in the heating well when the heated air enters the heating well: adjusting the temperature of the heated air to make the temperature in the heating well in a set range T1Internal;
in the step (3), when the heated air and/or tail gas enters the heating well, the method further comprises the following steps of adjusting the temperature in the heating well: (I) judging whether the tail gas is injected back into the heating well: if no tail gas is reinjected, independently adjusting the temperature of the heated air so as to enable the temperature in the heating well to be within a set range T1Internal; if the tail gas is reinjected, entering the next step; (II) determination of the exhaust gas flow Q4Whether or not the initial flow rate Q of heated air is exceeded1: if Q4Greater than or equal to Q1Independently adjusting the temperature of the tail gas to enable the temperature in the heating well to be in a set range T1If not, the temperature of the tail gas and the heated air is adjusted simultaneously to ensure that the temperature in the heating well is in a set range T1And (4) the following steps.
Preferably, the temperature of the exhaust gas is regulatedT2And temperature T of heated air3The same is true.
Preferably, the step (2) further comprises the step of adjusting the heating temperature of the oxygen so that the temperature in the thermal catalytic oxidation reaction chamber is in the set range T4And (4) the following steps.
Preferably, in step (2), the oxygen flow rate Q3The flow rate of the organic pollutants is 1-2 times larger than that of the organic pollutants, and the flow rate of the organic pollutants is the product of the concentration of the organic pollutants and the flow rate of the organic pollution gas.
As another aspect of the present disclosure, there is provided an in situ thermal desorption-oxidation remediation system for an organic contaminated site, comprising:
the in-situ thermal desorption unit comprises a blowing device, a heating well, an extraction well and an extraction device, wherein the blowing device conveys heated air into the heating well, the heated air enters the polluted soil of the organic polluted site through the heating well to carry out thermal desorption on organic pollutants, and organic polluted gas generated by the thermal desorption is extracted from the extraction well under the action of the extraction device;
the oxidation unit comprises an oxygen supply device and a thermal catalytic oxidation reaction chamber, the oxygen supply device conveys oxygen into the thermal catalytic oxidation reaction chamber, the thermal catalytic oxidation reaction chamber comprises an organic pollution gas inlet and a tail gas outlet, the organic pollution gas inlet is connected to the extraction device so that the organic pollution gas enters the thermal catalytic oxidation reaction chamber for catalytic oxidation and produces tail gas, the tail gas outlet is connected to the heating well through a control valve, and the control valve controls tail gas evacuation or reinjection into the heating well;
the monitoring unit comprises a flow sensor positioned at the air blowing device, the extraction device, the oxygen supply device and the tail gas outlet, a first pollutant online monitoring device arranged at the extraction device and a second pollutant online monitoring device arranged at the tail gas outlet;
and the control unit comprises a central controller and a frequency converter, wherein the central controller controls the air blowing device, the extraction device, the oxygen supply device and the control valve through the frequency converter according to the data monitored by the monitoring unit to execute the in-situ thermal desorption-oxidation repair method.
Preferably, the in-situ thermal desorption unit further comprises: the first heating device is positioned at the air blowing device and used for heating the air blown by the air blowing device to form the heated air;
the oxidation unit further comprises: a third heating device positioned at the control valve to heat the tail gas in the reinjection heating well;
the monitoring unit further comprises: the temperature sensors are arranged in the heating well, the first heating device and the third heating device;
the central controller controls the first heating device and the third heating device through a frequency converter according to the data of the temperature sensor to execute the following steps:
(I) judging whether the tail gas is injected back into the heating well: if no tail gas is reinjected, independently adjusting the temperature of the heated air so as to enable the temperature in the heating well to be within a set range T1Internal; if the tail gas is reinjected, entering the next step;
(II) determination of the exhaust gas flow Q4Whether or not the initial flow rate Q of heated air is exceeded1: if Q4Greater than or equal to Q1Independently adjusting the temperature of the tail gas to enable the temperature in the heating well to be in a set range T1If not, the temperature of the tail gas and the heated air is adjusted simultaneously to ensure that the temperature in the heating well is in a set range T1And (4) the following steps.
Preferably, the control system further comprises a solar power unit connected to the first and third heating devices.
Preferably, the in-situ thermal desorption unit further comprises: the second heating device is positioned at the oxygen supply device and used for heating the oxygen output by the oxygen supply device;
the monitoring unit further comprises: the temperature sensor is arranged in the thermal catalytic oxidation reaction chamber;
the central controller controls a second heating device through a frequency converter according to the data of the temperature sensor to execute the following steps:
adjusting the heating temperature of oxygen to ensure the temperature in the thermal catalytic oxidation reaction chamberDegree is in the set range T4And (4) the following steps.
Preferably, the central controller is a PLC programmable logic controller.
Based on the technical scheme, the invention has the beneficial effects that:
(1) according to the invention, in-situ thermal desorption and thermal catalytic oxidation are combined, the oxygen gas inflow is automatically adjusted according to pollutant concentration data and flow monitoring data, the tail gas evacuation or reinjection heating well is controlled according to the generated tail gas flow and pollutant concentration data, and the air gas inflow is automatically adjusted, so that the stable control of the flow in the in-situ thermal desorption-oxidation treatment process is ensured, and the continuous and efficient removal of organic pollutants is facilitated.
(2) The tail gas which does not reach the emission standard is injected back into the heating well, the waste heat of the tail gas is fully utilized, the energy is recycled, and meanwhile, the degradation rate is improved through repeated cyclic degradation of gas-phase organic pollutants.
(3) Further combine flow data and temperature monitoring data, carry out automatic control to heating device's operation to automatically regulated air and tail gas heating temperature have guaranteed the stable control of temperature in the heating well, and automatically regulated oxygen heating temperature, guarantee that gaseous phase organic pollutant's lasts the efficient and gets rid of.
(4) The heating device is heated by the solar power supply unit, so that the purpose of saving energy can be achieved.
Drawings
FIG. 1 is a schematic diagram of the composition and control process of an in-situ thermal desorption-oxidation remediation system for an organic contaminated site according to the present invention.
Detailed Description
In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.
Aiming at the problem of mutual control of air inflow, temperature and tail gas emission in the operation process of the in-situ thermal desorption-oxidation repair system, the invention automatically adjusts the oxygen air inflow according to pollutant concentration data and flow monitoring data, controls the tail gas to be emptied or reinjected into a heating well according to the generated tail gas flow and the pollutant concentration data, and automatically adjusts the air inflow, thereby ensuring the stable control of the flow in the in-situ thermal desorption-oxidation treatment process and being beneficial to the continuous and efficient removal of organic pollutants; further combine flow data and temperature monitoring data, carry out automatic control to heating device's operation to automatically regulated air and tail gas heating temperature have guaranteed the stable control of temperature in the heating well, and automatically regulated oxygen heating temperature, guarantee that gaseous phase organic pollutant's lasts the efficient and gets rid of.
FIG. 1 is a schematic diagram of the composition and control process of an in-situ thermal desorption-oxidation remediation system for an organic contaminated site according to the present invention. As shown in fig. 1, the in-situ thermal desorption-oxidation remediation system for an organic contaminated site of the present invention comprises:
the in-situ thermal desorption unit comprises a blowing device, a heating well, an extraction well and an extraction device, wherein the blowing device conveys heated air into the heating well, the heated air enters the polluted soil of the organic polluted site through the heating well to carry out thermal desorption on organic pollutants, and organic polluted gas generated by the thermal desorption is extracted from the extraction well under the action of the extraction device;
the oxidation unit comprises an oxygen supply device and a thermal catalytic oxidation reaction chamber, the oxygen supply device conveys oxygen into the thermal catalytic oxidation reaction chamber, the thermal catalytic oxidation reaction chamber comprises an organic pollution gas inlet and a tail gas outlet, the organic pollution gas inlet is connected to a pumping device so that the organic pollution gas enters the thermal catalytic oxidation reaction chamber for catalytic oxidation and produces tail gas, the tail gas outlet is connected to the heating well through a control valve, and the control valve controls tail gas evacuation or reinjection into the heating well;
the monitoring unit comprises a first flow sensor positioned at the blowing device, a second flow sensor positioned at the extraction device, a third flow sensor positioned at the oxygen supply device, a fourth flow sensor positioned at the tail gas outlet, a first pollutant online monitoring device arranged at the extraction device and a second pollutant online monitoring device arranged at the tail gas outlet;
and the control unit comprises a central controller and a frequency converter, the central controller is preferably a PLC (programmable logic controller), and the central controller controls the air blowing device, the pumping device, the oxygen supply device and the control valve through the frequency converter according to the data monitored by the monitoring unit so as to execute the following processes, so that the flow is kept stable in the in-situ thermal desorption-oxidation repair process, and the repair effect is ensured:
(1) controlling the operation of the blowing device and the extraction device to enable the first flow sensor to measure the initial flow of the heated air within a set range Q1And the flow rate of the organic pollution gas measured by the second flow sensor is in a set range Q2Internal;
(2) acquiring oxygen supply amount required by catalytic oxidation according to the flow of the second flow sensor and the pollutant concentration measured by the first pollutant on-line monitoring device, and controlling the oxygen supply device to operate so as to enable the oxygen flow Q measured by the third flow sensor3Equal to the oxygen supply;
preferably, the oxygen supply amount is 1-2 times larger than the flow of the organic pollutants, and the flow of the organic pollutants is obtained by flow data of the second flow sensor and pollutant concentration data measured by the first pollutant online monitoring device.
(3) Judging whether the tail gas can be exhausted according to the pollutant concentration measured by the second pollutant online monitoring device, if the pollutant concentration reaches the emission standard, exhausting, if the pollutant concentration does not reach the emission standard, injecting the tail gas back into the heating well, and measuring the flow of the tail gas through a fourth flow sensor;
(4) judging the flow Q of the fourth flow sensor4Whether or not the predetermined range Q is exceeded1If Q is4Greater than or equal to Q1If the flow rate measured by the first flow rate sensor is Q, the blowing device is turned off, otherwise, the operation of the blowing device is adjusted to ensure that the flow rate measured by the first flow rate sensor is Q1And Q4A difference of (d);
(5) and (4) if the pollutant concentrations measured by the first pollutant online monitoring device and the second pollutant online monitoring device reach the emission standard, completing in-situ thermal desorption-oxidation remediation of the organic polluted site, and otherwise, continuing the flow from the step (1) to the step (4).
Further, the in-situ thermal desorption unit further comprises: the first heating device is positioned at the air blowing device and used for heating the air blown out by the air blowing device to form heated air;
the oxidation unit further comprises: the third heating device is positioned at the outlet of the control valve and used for heating the tail gas in the reinjection heating well;
the monitoring unit further comprises: a first temperature sensor disposed within the heating well;
the central controller controls the first heating device and the third heating device through the frequency converter according to the data of the first temperature sensor to execute the following procedures so as to keep the temperature in the heating well stable:
(I) judging whether tail gas is injected back into the heating well, if no tail gas is injected back, controlling the first heating device to operate so that the temperature data of the first temperature sensor is in a set range T1If not, the next step is carried out;
(II) determining the flow Q of the fourth flow sensor4Whether or not the predetermined range Q is exceeded1If Q is4Greater than or equal to Q1Controlling the third heating device to operate independently to enable the temperature data of the first temperature sensor to be in the set range T1If not, controlling the first heating device and the third heating device to operate simultaneously to enable the temperature data of the first temperature sensor to be in the set range T1And (4) the following steps.
Furthermore, a second temperature sensor is arranged in the first heating device, a third temperature sensor is arranged in the third heating device, and when the first heating device and the third heating device run simultaneously, the temperature data T of the second temperature sensor is enabled to be generated by controlling the operation of the first heating device and the third heating device2And temperature data T of the third temperature sensor3The same is true.
Further, the in-situ thermal desorption unit further comprises: the second heating device is positioned at the oxygen supply device and used for heating the oxygen output by the oxygen supply device;
the monitoring unit further comprises: the fourth temperature sensor is arranged in the thermal catalytic oxidation reaction chamber;
the central controller controls the second heating device through the frequency converter according to the data of the fourth temperature sensor to execute the following processes:
controlling the operation of the second heating device so that the temperature of the fourth temperature sensor is within the set range T4And (4) the following steps.
Further, the control system further comprises a solar power supply unit, the solar power supply unit is connected to the first heating device, the second heating device and the third heating device, and the solar power supply unit converts light energy into electric energy by means of a solar photovoltaic panel and stores the electric energy in the storage battery for supplying power to the heating devices.
The technical solution of the present invention is further explained with reference to the following specific examples:
in a VOC contaminated site, the pollutants are mainly petroleum hydrocarbons and polycyclic aromatic hydrocarbons. According to the figure 1, each corresponding device is connected, and the temperature T of the heating well is firstly controlled by a control panel on a PLC programmable logic controller1Initial flow rate Q of blower device1Flow rate Q of extraction device2And the temperature T in the thermal catalytic oxidation reaction chamber4And the PLC calculates according to related programs, outputs corresponding 4-20 mA control signals to a frequency converter with a 4-20 mA signal receiving function, and automatically controls the blowing device, the extracting device, the oxygen supply device and the heating device through the frequency converter. Setting the temperature T of the heater well1Is 400 ℃ and the initial flow Q of the blowing device1Is 1.0m3And/min, the PLC automatically adjusts the heating temperature of the first heating device to be about 450 ℃. The first pollutant on-line monitoring device monitors the concentration change of petroleum hydrocarbon and polycyclic aromatic hydrocarbon, and a second flow sensor data Q is set2Is 0.3m3Min, setting the temperature T in the thermal catalytic oxidation reaction chamber4The oxygen supply flow Q of the oxygen supply device is automatically adjusted by the PLC through a preset operation program at the temperature of 400 DEG C3Is 1.5m3Min and the heating temperature of the second heating device was 400 ℃. According to the 2# monitoring data D of the on-line monitoring device2As changes in petroleum hydrocarbon, polycyclic aromatic hydrocarbon and oxygen concentrationThe PLC judges whether the tail gas meets the emission standard or not through a preset program, and if the tail gas meets the emission standard, the PLC starts the emission program and opens a tail gas exhaust valve; and if the discharge standard is not met, the oil enters a third heating device and is reinjected to the heating inclined shaft again. At this time, the fourth flow sensor detects the flow rate Q of the exhaust gas4Is 1.5m3Min, flow rate Q over blower11.0m3And/min, the PLC automatically cuts off the blower and the first heating device through a preset program, and at the moment, the PLC automatically adjusts the heating temperature T of the third heating device through a preset operation program according to the change of the data of the first temperature sensor in the heating well4. Along with the operation of the in-situ thermal desorption-oxidation system, the PLC continues to monitor data D of the first pollutant on-line monitoring device1And flow data Q of the second flow sensor2Automatically adjusting the flow of oxygen supply; according to the monitoring data D of the second pollutant on-line monitoring device2And flow rate Q of tail gas4The change of the temperature control unit controls whether the tail gas is exhausted and the flow of the air blowing device is automatically adjusted, the heating temperatures of the first heating device and the third heating device are automatically adjusted according to the data of the first temperature sensor in the heating well, the heating temperature of the second heating device is automatically adjusted according to the temperature in the thermal catalytic oxidation reaction chamber, and the operation is repeated, so that the monitoring data D of the first pollutant on-line monitoring device is obtained1And monitoring data D of the second pollutant on-line monitoring device2The organic pollution site in-situ thermal desorption-oxidation remediation is completed when the organic pollution site meets the emission standard.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. An in-situ thermal desorption-oxidation remediation method for an organic contaminated site is characterized by comprising the following steps:
(1) the heated air is blown into the heating well through the blowing device, and the temperature of the heated air is adjusted, so that the temperature in the heating well is in a set range T1Inner, initial flow rate Q of the heated air1The heating well enters the polluted soil of the organic polluted site to carry out thermal desorption of organic pollutants, and the organic polluted gas generated by thermal desorption is pumped out through the pumping device to form a flow Q2Pumping out from the extraction well;
(2) the organic pollution gas and oxygen are sent into a thermal catalytic oxidation reaction chamber for catalytic oxidation and tail gas is produced, wherein the oxygen flow rate Q3Adjusting according to the concentration of the organic pollutants and the flow of the organic polluted gas monitored in real time;
(3) the concentration of organic pollutants in the tail gas is monitored in real time, if the concentration of the organic pollutants reaches the emission standard, the tail gas is emptied, and the temperature of heated air is independently adjusted when the heated air enters the heating well, so that the temperature in the heating well is within a set range T1Internal; if the concentration data of the organic pollutants do not reach the emission standard, injecting the tail gas back into the heating well, and controlling the flow Q of the tail gas injected back into the heating well4Monitoring is carried out;
(4) if the tail gas is reinjected into the heating well, judging the tail gas flow Q reinjected into the heating well4Whether or not the initial flow rate Q of heated air is exceeded1If Q is4Greater than or equal to Q1Closing the air blowing device, and independently adjusting the temperature of the tail gas when the tail gas enters the heating well to ensure that the temperature in the heating well is in a set range T1And if not, adjusting the operation of the air blowing device to ensure that the generated heated air flow is Q1And Q4And adjusting the temperature of the tail gas and the heated air simultaneously when the tail gas and the heated air enter the heating well to ensure that the temperature in the heating well is within a set range T1Internal;
(5) and (3) if the concentration data of the organic pollutants in the organic pollutant gas and the tail gas reach the emission standard, completing the in-situ thermal desorption-oxidation remediation of the organic pollution site, and otherwise, continuing the flow from the step (1) to the step (4).
2. The in-situ thermal desorption-oxidation remediation method of claim 1, wherein the temperature T of the tail gas is adjusted2And temperature T of heated air3The same is true.
3. The in-situ thermal desorption-oxidation remediation method of claim 1, wherein the step (2) further comprises the step of adjusting the oxygen heating temperature to maintain the temperature in the thermal catalytic oxidation reaction chamber within the set range T4And (4) the following steps.
4. The in-situ thermal desorption-oxidation remediation method of claim 1, wherein in step (2), the oxygen flow rate Q is3The flow rate of the organic pollutants is 1-2 times larger than that of the organic pollutants, and the flow rate of the organic pollutants is the product of the concentration of the organic pollutants and the flow rate of the organic pollution gas.
5. An in-situ thermal desorption-oxidation remediation system for an organic contaminated site, comprising:
the in-situ thermal desorption unit comprises a blowing device, a heating well, an extraction well and an extraction device, wherein the blowing device conveys heated air into the heating well, the heated air enters the polluted soil of the organic polluted site through the heating well to carry out thermal desorption on organic pollutants, and organic polluted gas generated by the thermal desorption is extracted from the extraction well under the action of the extraction device;
the oxidation unit comprises an oxygen supply device and a thermal catalytic oxidation reaction chamber, the oxygen supply device conveys oxygen into the thermal catalytic oxidation reaction chamber, the thermal catalytic oxidation reaction chamber comprises an organic pollution gas inlet and a tail gas outlet, the organic pollution gas inlet is connected to the extraction device so that the organic pollution gas enters the thermal catalytic oxidation reaction chamber for catalytic oxidation and produces tail gas, the tail gas outlet is connected to the heating well through a control valve, and the control valve controls tail gas evacuation or reinjection into the heating well;
the monitoring unit comprises a flow sensor positioned at the air blowing device, the extraction device, the oxygen supply device and the tail gas outlet, a first pollutant online monitoring device arranged at the extraction device and a second pollutant online monitoring device arranged at the tail gas outlet;
a control unit comprising a central controller and a frequency converter, wherein the central controller controls the blowing device, the pumping device, the oxygen supply device and the control valve through the frequency converter according to the data monitored by the monitoring unit to execute the in-situ thermal desorption-oxidation repair method according to any one of claims 1 to 4.
6. The in-situ thermal desorption-oxidation remediation system of claim 5, wherein the in-situ thermal desorption unit further comprises: the first heating device is positioned at the air blowing device and used for heating the air blown by the air blowing device to form the heated air;
the oxidation unit further comprises: a third heating device positioned at the control valve to heat the tail gas in the reinjection heating well;
the monitoring unit further comprises: the temperature sensors are arranged in the heating well, the first heating device and the third heating device;
the central controller controls the first heating device and the third heating device through a frequency converter according to the data of the temperature sensor to execute the following steps:
(I) judging whether the tail gas is injected back into the heating well: if no tail gas is reinjected, independently adjusting the temperature of the heated air so as to enable the temperature in the heating well to be within a set range T1Internal; if the tail gas is reinjected, entering the next step;
(II) determination of the exhaust gas flow Q4Whether or not the initial flow rate Q of heated air is exceeded1: if Q4Greater than or equal to Q1Independently adjusting the temperature of the tail gas to enable the temperature in the heating well to be in a set range T1If not, the temperature of the tail gas and the heated air is adjusted simultaneously to ensure that the temperature in the heating well is in a set range T1And (4) the following steps.
7. The in-situ thermal desorption-oxidation remediation system of claim 6, wherein the control system further comprises a solar power unit connected to the first and third heating devices.
8. The in-situ thermal desorption-oxidation remediation system of claim 5, wherein the in-situ thermal desorption unit further comprises: the second heating device is positioned at the oxygen supply device and used for heating the oxygen output by the oxygen supply device;
the monitoring unit further comprises: the temperature sensor is arranged in the thermal catalytic oxidation reaction chamber;
the central controller controls a second heating device through a frequency converter according to the data of the temperature sensor to execute the following steps:
adjusting the heating temperature of the oxygen to ensure that the temperature in the thermal catalytic oxidation reaction chamber is in a set range T4And (4) the following steps.
9. The in-situ thermal desorption-oxidation remediation system of any one of claims 5 to 8, wherein the central controller is a PLC programmable logic controller.
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| CN201810293902.7A CN108480375B (en) | 2018-04-03 | 2018-04-03 | In-situ thermal desorption-oxidation repair system and repair method for organic polluted site |
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| CN201810293902.7A CN108480375B (en) | 2018-04-03 | 2018-04-03 | In-situ thermal desorption-oxidation repair system and repair method for organic polluted site |
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| CN108480375B true CN108480375B (en) | 2020-08-21 |
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| WO2022122555A1 (en) * | 2020-12-09 | 2022-06-16 | Haemers Technologies Societe Anonyme | Mixed system for decontaminating soils by thermal desorption and for generating electric power using solar energy |
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| CN102671526B (en) * | 2012-01-04 | 2014-05-07 | 河南科技大学 | Method and device for treating soil volatile organic pollutant through low temperature plasma |
| CN103203355B (en) * | 2013-04-12 | 2014-11-05 | 江苏大地益源环境修复有限公司 | Ectopic thermal desorption treatment method of polluted soil |
| CN204769854U (en) * | 2015-06-29 | 2015-11-18 | 中石化炼化工程（集团）股份有限公司 | Organic contaminated soil's hot -air is reinforceed gaseous phase and is extracted normal position prosthetic devices |
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| CN206305196U (en) * | 2016-12-16 | 2017-07-07 | 海绵城市投资股份有限公司 | A kind of organic polluted soil thermal desorption is repaired and tail gas catalyzed controlling device |
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| BE1028862B1 (en) * | 2020-12-09 | 2022-07-12 | Haemers Tech Societe Anonyme | Mixed system of soil depollution by thermal desorption and production of electrical energy using solar energy |
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