CN109013685A - A kind of hydrocarbon contamination soil repair system based on thermal desorption in situ - Google Patents
A kind of hydrocarbon contamination soil repair system based on thermal desorption in situ Download PDFInfo
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- CN109013685A CN109013685A CN201810739168.2A CN201810739168A CN109013685A CN 109013685 A CN109013685 A CN 109013685A CN 201810739168 A CN201810739168 A CN 201810739168A CN 109013685 A CN109013685 A CN 109013685A
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- 239000002689 soil Substances 0.000 title claims abstract description 105
- 238000003795 desorption Methods 0.000 title claims abstract description 84
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 84
- 239000004215 Carbon black (E152) Substances 0.000 title claims abstract description 35
- 229930195733 hydrocarbon Natural products 0.000 title claims abstract description 35
- 150000002430 hydrocarbons Chemical class 0.000 title claims abstract description 35
- 230000008439 repair process Effects 0.000 title abstract description 8
- 238000011109 contamination Methods 0.000 title abstract 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 159
- 239000007788 liquid Substances 0.000 claims abstract description 108
- 238000001179 sorption measurement Methods 0.000 claims abstract description 76
- 238000000926 separation method Methods 0.000 claims abstract description 66
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 138
- 238000010438 heat treatment Methods 0.000 claims description 60
- 239000002699 waste material Substances 0.000 claims description 42
- 238000001514 detection method Methods 0.000 claims description 39
- 238000007789 sealing Methods 0.000 claims description 36
- 238000005067 remediation Methods 0.000 claims description 34
- 230000005540 biological transmission Effects 0.000 claims description 17
- 239000002912 waste gas Substances 0.000 claims description 14
- 238000000746 purification Methods 0.000 claims description 12
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 8
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 3
- 238000004064 recycling Methods 0.000 abstract description 3
- 238000010521 absorption reaction Methods 0.000 abstract 1
- 230000026676 system process Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 239000003344 environmental pollutant Substances 0.000 description 7
- 231100000719 pollutant Toxicity 0.000 description 7
- 230000001276 controlling effect Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 239000012855 volatile organic compound Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000002957 persistent organic pollutant Substances 0.000 description 4
- 238000000605 extraction Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 241000282414 Homo sapiens Species 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000010815 organic waste Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000003900 soil pollution Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a kind of hydrocarbon contamination soil repair systems based on thermal desorption in situ, comprising: thermal desorption device in situ, control device, gas-liquid separation device, activated carbon adsorption device, emission sensing device；Wherein, thermal desorption device in situ is connect with gas-liquid separation device；Gas-liquid separation device is connect with activated carbon adsorption device；Activated carbon adsorption device is connect with emission sensing device；Control device is connect with thermal desorption device in situ, gas-liquid separation device, activated carbon adsorption device and emission sensing device respectively, completes hydrocarbon contamination soil repair system process to thermal desorption device in situ, gas-liquid separation device, activated carbon adsorption device and emission sensing device Collaborative Control.The hydrocarbon contamination soil repair system is able to achieve the absorption of organic exhaust gas and recycling for active carbon, and at low cost, skid meets the national conditions demand of China's sustainable development instantly.
Description
Technical Field
The invention relates to the field of environmental engineering, In particular to a hydrocarbon contaminated soil remediation system based on In Situ Thermal Desorption (ISTD).
Background
At present, the environmental crisis problem is increasingly strengthened, and published national soil pollution condition survey bulletin shows that the land with the maximum of three land is eroded, and one fifth of cultivated land is polluted. The soil pollution directly causes the yield reduction of crops, the biological quality is continuously reduced, and the human health is seriously threatened. In the latest national ecological environment protection program, in part of cities with concentrated polluted plots, the hydrocarbon pollutants are required to be treated and repaired by regularly and orderly developing and re-developing the polluted plots. Hydrocarbon pollutants are directly desorbed from soil under certain conditions to generate Volatile Organic Compounds (VOCs), and the effect of VOCs on enhancing atmospheric oxidation is more important than that of nitrogen oxides NOx and is the most important pollutant causing serious haze pollution. If hydrocarbon pollutants are accumulated in soil, the environment and the sanitation can be seriously polluted, a series of problems such as energy waste, potential safety hazard, economic loss and the like are caused, and the threat to the life health of human beings is caused.
The soil vapor extraction SVE technology is one of the very effective technologies in the current organic pollutant soil treatment technology. In the repairing process, in order to improve the working efficiency of the SVE technology, a mode of heating a polluted site is often adopted, so that organic pollutants are quickly separated from a polluted medium, and the repairing period is shortened. However, in the existing soil vapor extraction SVE technology, vacuum equipment is mostly adopted to generate negative pressure to drive air to flow through soil pores, so that VOCs are entrained to flow to an extraction system, the control is unreasonable in the treatment process, and great potential safety hazards exist.
Disclosure of Invention
Based on the problems in the prior art, the invention aims to provide a hydrocarbon contaminated soil remediation system based on in-situ thermal desorption, which is low in treatment cost and good in remediation effect, and can treat the extracted pollutants in a gas phase form and then discharge the pollutants up to the standard.
The purpose of the invention is realized by the following technical scheme:
the embodiment of the invention provides a hydrocarbon contaminated soil remediation system based on in-situ thermal desorption, which comprises:
the device comprises an in-situ thermal desorption device, a control device, a gas-liquid separation device, an activated carbon adsorption device and an exhaust detection device; wherein,
the in-situ thermal desorption device is respectively provided with an air inlet pipe, an organic gas outlet, a pressure control end and a temperature control end;
an organic gas outlet of the in-situ thermal desorption device is connected with an organic gas outlet pipe of the gas-liquid separation device;
the gas-liquid separation device is provided with a separated waste gas leading-out pipe which is connected with the activated carbon adsorption device;
the active carbon adsorption device is provided with an exhaust pipe, and the exhaust pipe is connected with the exhaust detection device;
the control device is respectively electrically connected with the pressure control end and the temperature control end of the in-situ thermal desorption device through a first pressure control circuit and a temperature control circuit, and can detect and control the pressure and the temperature of the in-situ thermal desorption device;
the control device is electrically connected with the gas-liquid separation device through a second pressure control circuit and can control the pressure of the gas-liquid separation device;
the control device is electrically connected with the activated carbon adsorption device through a third pressure control circuit and can control the pressure of the activated carbon adsorption device;
the exhaust detection device is provided with a data transmission line, the control device is in communication connection with the exhaust detection device through the data transmission line, and gas emission can be controlled according to the detection result of the exhaust detection device.
According to the technical scheme provided by the invention, the hydrocarbon contaminated soil remediation system based on in-situ thermal desorption provided by the embodiment of the invention has the beneficial effects that:
by arranging the in-situ thermal desorption device, the gas-liquid separation device and the activated carbon adsorption device which are in organic connection to be matched with each other, the removal of VOCs in organic polluted soil, the gas-liquid separation of soil volatile gas, the adsorption of organic waste gas and the cyclic utilization of activated carbon can be realized, the treatment cost is low, and the sustainable development national conditions are met; the in-situ thermal desorption device does not need vacuum equipment to generate negative pressure, works under normal pressure and has higher safety; through electromechanical control and the cooperation of active carbon adsorption device of controlling means, make the hydrocarbon contaminated soil repair system based on normal position thermal desorption have the effect of adsorbing and purifying oil gas, wastes material resourceization and automatic control, detect the gas concentration after the active carbon tank device purifies often, can discharge to reach standard after the assurance system handles.
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 description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic view of a hydrocarbon contaminated soil remediation system based on in-situ thermal desorption provided by an embodiment of the invention;
in the figure: 1-an in-situ thermal desorption device; 2-a control device; 3-a gas-liquid separation device; 4-an activated carbon adsorption device; 5-an exhaust gas detection device; 6-air inlet pipe; 7-an air compressor; 8-a first gas flow meter; 9-an electromagnetic valve; 10-a first pressure gauge; 11-organic contaminated soil sealing treatment box; 12-a first thermometer; 13-a second thermometer; 14-a second pressure gauge; 15-heating well porous shell; 16-heating well silicon carbide rod; 17-heating the well electrode; 18-organic gas outlet; 19-a heating well; 20-a master control system platform; 21-a first pressure controller; 22-a temperature controller; 23-a second pressure controller; 24-a third pressure controller; 25-a master control system circuit; 26-a first pressure control line; 27-temperature control circuit; 28-a second pressure control line; 29-a third pressure control line; 30-an organic gas outlet pipe; 31-a first fan; 32-condenser gas inlet pipe; 33-a condenser; 34-a condensed waste liquid delivery pipe; 35-a waste liquid purification tank; 36-a gas-liquid separation tank inlet pipe; 37-a gas-liquid separation tank; 38-separated waste liquid leading-out pipe; 39-a liquid level meter; 40-a separated waste gas outlet pipe; 41-a second gas flow meter; 42-a second fan; 43-activated carbon adsorption tank gas inlet pipe; 44-activated carbon adsorption tank; 45-a third thermometer; 46-a third pressure gauge; 47-fourth thermometer; 48-an exhaust pipe; 49-HC concentration detector; 50-a data collector; 51-data transmission line.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the specific contents 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 embodiments. 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 all references herein to "up", "down", "left", "right", "front", "back" describing an orientation do not refer to that orientation unless specifically stated, but merely for convenience of description, the orientation of the product may vary from one orientation to another. An orientation that would be understood by one of ordinary skill in the art without making any creative effort would be within the scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides an in-situ thermal desorption-based hydrocarbon contaminated soil remediation system, including:
the device comprises an in-situ thermal desorption device 1, a control device 2, a gas-liquid separation device 3, an activated carbon adsorption device 4 and an exhaust detection device 5; wherein,
the in-situ thermal desorption device 1 is respectively provided with an air inlet pipe 6, an organic gas outlet 18, a pressure control end and a temperature control end;
the organic gas outlet 18 of the in-situ thermal desorption device 1 is connected with the organic gas outlet pipe 30 of the gas-liquid separation device 3;
the gas-liquid separation device 3 is provided with a separated waste gas leading-out pipe 40, and the separated waste gas leading-out pipe 40 is connected with the activated carbon adsorption device 4;
the activated carbon adsorption device 4 is provided with an exhaust pipe 48, and the exhaust pipe 48 is connected with the exhaust detection device 5;
the control device 2 is electrically connected with the pressure control end and the temperature control end of the in-situ thermal desorption device 1 through a first pressure control circuit 26 and a temperature control circuit 27 respectively, and can detect and control the pressure and the temperature of the in-situ thermal desorption device 1;
the control device 2 is electrically connected to the gas-liquid separation device 3 through a second pressure control line 28, and is capable of controlling the pressure of the gas-liquid separation device 3;
the control device 2 is electrically connected with the activated carbon adsorption device 4 through a third pressure control circuit 29 and can control the pressure of the activated carbon adsorption device 4;
the exhaust gas detection device 5 is provided with a data transmission line 51, and the control device 2 is in communication connection with the exhaust gas detection device 5 through the data transmission line 51 and can control gas emission according to the detection result of the exhaust gas detection device 5.
In the soil remediation system, the control device 2 can cooperatively control the in-situ thermal desorption device 1, the gas-liquid separation device 3, the activated carbon adsorption device 4 and the exhaust detection device 5 to complete the remediation process of the hydrocarbon-contaminated soil.
Referring to fig. 1, in the soil remediation system, the in-situ thermal desorption apparatus 1 includes:
the organic contaminated soil treatment system comprises an air inlet pipe 6, an air compressor 7, a first gas flowmeter 8, an electromagnetic valve 9, a first pressure gauge 10, an organic contaminated soil sealing treatment box 11, a first thermometer 12, a second thermometer 13, a second pressure gauge 14, a heating well device and an organic gas outlet 18, wherein:
one end of an air inlet pipe 6 is communicated with the outside, and the other end of the air inlet pipe is connected with an organic contaminated soil sealing treatment box 11 through an air compressor 7, a first gas flowmeter 8 and an electromagnetic valve 9 in sequence;
the organic contaminated soil sealing treatment box 11 is provided with an organic gas outlet 18;
the control end of the air compressor 7 is a pressure control end;
the heating well device is arranged in the organic contaminated soil sealing treatment box 11;
the first pressure gauge 10 is connected with the inside of the organic contaminated soil sealing treatment box 11;
the detection end of the first pressure gauge 10 and the control end of the air compressor 7 are used as pressure control ends;
the second pressure gauge 14 is connected to an organic gas outlet 18 inside the organic contaminated soil sealing treatment box 11;
the first thermometer 12 and the second thermometer 13 are respectively connected with the organic contaminated soil sealing treatment box 11;
the detection ends of the first thermometer 12 and the second thermometer 13 and the control end of the heater well device are used as temperature control ends.
Among the above-mentioned soil remediation system, the heater well device includes: a plurality of heating wells which are arranged in parallel in the organic contaminated soil sealing treatment box 11;
the heater well structures are the same, and every heater well includes: a heating well porous shell 15, a heating well silicon carbide rod 16 and a heating well electrode 17; wherein, the heating well silicon carbide rod 16 is arranged in the heating well porous shell 15, the upper end of the heating well silicon carbide rod 16 is provided with a heating well electrode 17, and the upper end of the heating well electrode 17 is a control end.
The number of the heating wells and the positions arranged in the organic contaminated soil sealing treatment box 11 can be adjusted according to the area of the in-situ hydrocarbon contaminated soil to be treated. The number of the heating well devices arranged in fig. 1 is three, and the heating well devices are arranged in the organic contaminated soil seal box 11 in parallel, which is the preferable number and arrangement mode of the heating wells.
Specifically, in the in-situ thermal desorption device 1, the air inlet pipe 6 is communicated with the outside and is connected with the organic contaminated soil sealing treatment box 11 through the air compressor 7, the first gas flowmeter 8 and the electromagnetic valve 9; the first pressure gauge 10 monitors the internal pressure of the organic contaminated soil sealing treatment box 11, and controls the air compressor 7 according to the internal pressure; the heating well porous shell 15, the heating well silicon carbide (SIC) rod 16 and the heating well electrode 17 jointly form a heating well 19 for heating the organic contaminated soil in the organic contaminated soil sealing treatment box 11; the first thermometer 12 and the second thermometer 13 monitor the temperature of different points of the organic contaminated soil sealing treatment box 11, and control the temperature of a heating well which is jointly composed of a heating well porous shell 15, a heating well silicon carbide (SIC) rod 16 and a heating well electrode 17 according to the internal temperature; the second pressure gauge 14 monitors the pressure inside the organic contaminated soil sealed processing box 11 near the organic gas outlet 18.
Above-mentioned normal position thermal desorption device 1 can be by the heating well device as the heat source to contaminated soil heat treatment in organic contaminated soil seal processing case 11, and normal position thermal desorption device 1's size can be adjusted the box size according to the volume of handling contaminated soil, can reduce the waste of treatment cost and heat energy like this. The in-situ thermal desorption device 1 can be used for sucking air by matching the air inlet pipe 6 with the fan and also can be used for sucking organic pollution mixed gas by matching the organic gas outlet 18 with the fan, so that the efficiency of the hydrocarbon pollution soil can be improved, the pressure balance in the in-situ thermal desorption device 1 can be ensured, the fan is controlled by the control device according to the pressure in the in-situ thermal desorption device 1, the vacuum is not needed to generate negative pressure to lead out the gas, and the safety of the soil remediation system is improved.
Referring to fig. 1, in the soil remediation system, the gas-liquid separation device 3 includes:
an organic gas leading-out pipe 30, a first fan 31, a condenser gas leading-in pipe 32, a condenser 33, a condensed waste liquid leading-out pipe 34, a waste liquid purification tank 35, a first gas-liquid separation tank leading-in pipe 36, a gas-liquid separation tank 37, a separated waste liquid leading-out pipe 38, a liquid level meter 39 and a separated waste gas leading-out pipe 40; wherein,
one end of the organic gas leading-out pipe 30 is a connecting end connected with the organic gas leading-out port 18 of the in-situ thermal desorption device 1, and the other end of the organic gas leading-out pipe 30 is connected with the first fan 31;
the first fan 31 is connected to the condenser 33 through a condenser gas introduction pipe 32;
the condenser 33 is respectively provided with a condensed waste liquid leading-out pipe 34 and a gas-liquid separation tank leading-in pipe 36, the condensed waste liquid leading-out pipe 34 is connected with a waste liquid collecting tank 35, and the gas-liquid separation tank leading-in pipe 36 is connected with a gas-liquid separation tank 37;
the gas-liquid separation tank 37 is provided with a separated waste liquid lead-out pipe 38 and a separated waste gas lead-out pipe 40, respectively, and the separated waste liquid lead-out pipe 38 is connected to the waste liquid purification tank 35.
Specifically, in the gas-liquid separation device 3, the organic gas outlet pipe 30 is connected to the organic gas outlet 18, and the organic contaminated gas in the organic contaminated soil sealed processing box 11 is led out; the organic gas outlet pipe 30 is connected with a first fan 31, and the first fan 31 pumps the organic pollution gas in the organic pollution soil sealing treatment box 11 into a condenser 33 through a condenser gas inlet pipe 32; a condensed waste liquid lead-out pipe 34 connects the condenser 33 with a waste liquid collecting tank 35, and waste water condensed by the condenser 33 flows into the waste liquid collecting tank 35; a gas-liquid separation tank introduction pipe 36 connecting the condenser 33 and the gas-liquid separation tank 37, and introducing the organic gas condensed by the condenser 33 into the gas-liquid separation tank 37; the separated waste liquid lead-out pipe 38 connects the gas-liquid separation tank 37 to the waste liquid purification tank 35, and the waste water separated by the gas-liquid separation tank 37 flows into the waste liquid purification tank 35.
Referring to fig. 1, in the soil remediation system, the activated carbon adsorption device 4 includes:
a second gas flow meter 41, a second fan 42, a gas introduction pipe 43, an activated carbon adsorption tank 44, a third thermometer 45, a third pressure gauge 46, a fourth thermometer 47, and an exhaust pipe 48; wherein,
the activated carbon adsorption tank 44 is provided with a gas inlet pipe 43 and an exhaust pipe 48 respectively; the exhaust pipe 48 is connected with the outlet of the activated carbon adsorption tank 44 and exhausts the treated gas;
the second gas flowmeter 41 and the second fan 42 are sequentially connected with a gas inlet pipe 43 of an activated carbon adsorption tank 44;
the second gas flowmeter 41 is provided with a connection end connected to the separated off-gas delivery pipe 40 of the gas-liquid separation device 3;
a third thermometer 45, a third pressure gauge 46 and a fourth thermometer 47 are respectively arranged on the activated carbon adsorption tank 44;
the third pressure gauge 46 and the control terminal of the second fan 42 are electrically connected to the control device via a third pressure control line 29.
Specifically, in the activated carbon adsorption device 4, the second gas flow meter 41 is connected to the gas introduction pipe 43, and controls the gas flow rate in the introduction pipe; the second fan 42 and the third pressure gauge 46 are connected with the third pressure controller 24 through a third pressure control line 29, so that pressure data of the third pressure gauge 46 is fed back to the third pressure controller 24, the second fan 42 is controlled according to the pressure data of the third pressure gauge 46, and the air inflow of the activated carbon adsorption tank 43 is controlled; the third thermometer 45 and the fourth thermometer 47 are connected to the lower part and the upper part of the activated carbon adsorption tank 44, respectively, and the third thermometer 45 measures the temperature of the lower part of the activated carbon adsorption tank 44 and the fourth thermometer 47 measures the temperature of the upper part of the activated carbon adsorption tank 44.
In the activated carbon adsorption apparatus 4, the third thermometer 45 is connected to the upper portion of the activated carbon adsorption tank 44, and the fourth thermometer 47 is connected to the lower portion of the activated carbon adsorption tank 44.
Referring to fig. 1, in the soil remediation system, the exhaust gas detection device 5 includes:
an HC concentration detector 49, a data collector 50 and a data transmission line 51; wherein,
the HC concentration detector 49 is connected to the exhaust pipe 48 of the activated carbon adsorption device 4, and can monitor the gas in the exhaust pipe 48;
the data acquisition unit is provided with a data transmission line 51;
the data acquisition unit 50 is electrically connected to the HC concentration detector 49, and can transmit data acquired by the HC concentration detector 49 to the control device 2 through a data transmission line 51.
Specifically, in the exhaust gas detection device 5, the HC concentration detector 49 monitors the gas in the exhaust pipe 48 of the activated carbon adsorption device 4, and analyzes whether the discharged gas reaches the standard; the data acquisition unit 50 collects data records collected by the HC concentration detector 49, and transmits the data to the master controller 20 of the control device 2 through the data transmission line 51, so that the emission of gas which does not reach the standard occurs, the alarm is given in time, and the emission of gas which is not reached to the standard can be conveniently checked at random, thereby ensuring that the emission of the treated gas meets the emission standard.
Referring to fig. 1, in the soil remediation system, the control device 2 includes:
a master controller 20, a first pressure controller 21, a temperature controller 22, a second pressure controller 23, a third pressure controller 24, a master control line 25, a first pressure control line 26, a temperature control line 27, a second pressure control line 28, and a third pressure control line 29; wherein,
the first pressure controller 21 is electrically connected with the first pressure gauge 10 and the air compressor 7 of the in-situ thermal desorption device 1 through a first pressure control line 26, and can control the pressure in the in-situ thermal desorption device 1 by controlling the air compressor 7 according to the pressure in the in-situ thermal desorption device 1 detected by the first pressure gauge 10;
the temperature controller 22 is electrically connected with the first thermometer 12 and the second thermometer 13 of the in-situ thermal desorption device 1 and the control end of the heating well device through a temperature control circuit 27, and can control the heating well device to control the temperature in the in-situ thermal desorption device 1 according to the temperature in the in-situ thermal desorption device 1 detected by the first thermometer 12 and the second thermometer 13;
the second pressure controller 23 is electrically connected to the second pressure gauge 14 of the in-situ thermal desorption device 1 and the first fan 31 of the gas-liquid separation device 3 through a second pressure control line 28, and can control the first fan 31 according to the pressure at the organic gas outlet 18 of the in-situ thermal desorption device 1 detected by the second pressure gauge 14;
the third pressure controller 24 is electrically connected with a third pressure gauge 46 of the activated carbon adsorption device 4 and the second fan 42 through a third pressure control line 29, and can control the second fan 42 according to the pressure in the activated carbon adsorption device 4 detected by the third pressure gauge 46;
the master controller 20 is electrically connected with the first pressure controller 21, the temperature controller 22, the second pressure controller 23 and the third pressure controller 24 through master control lines 25 respectively;
the overall controller 20 is electrically connected to the data transmission line 51 of the exhaust gas detection device 5 via the overall control line 25.
Specifically, in the control device 2, the master controller 20 collects and controls the detection data of the first pressure controller 21, the temperature controller 22, the second pressure controller 23 and the third pressure controller 24 through the master control system line 25;
the first pressure controller 21 controls the air compressor 7 according to the data detected by the first pressure gauge 10 to control the air inflow of the organic contaminated soil sealing treatment box 11, so as to control the internal pressure of the organic contaminated soil sealing treatment box 11;
the temperature controller 22 controls the heating well electrode 17 according to the temperatures of different areas of the organic contaminated soil sealed processing box 11 detected by the first thermometer 12 and the second thermometer 13, thereby controlling the temperature inside the organic contaminated soil sealed processing box 11;
the second pressure controller 23 controls the first fan 31 according to the data monitored by the second pressure gauge 14, so as to control the air inflow of the condenser 33, and the second pressure controller 24 controls the second fan 42 according to the data detected by the third pressure gauge 46, so as to control the air inflow of the activated carbon adsorption device 44;
the first pressure control line 26 connects the air compressor 7 and the first pressure gauge 10 with the first pressure controller 21, so as to realize that the pressure data of the first pressure gauge 10 is fed back to the first pressure controller 21, and the air compressor 7 is controlled according to the pressure data.
The temperature control circuit 27 connects the first thermometer 12, the second thermometer 13 and the electrode 17 with the temperature controller 22, so as to realize that the temperature data of the first thermometer 12 and the second thermometer 13 are fed back to the temperature controller 22, and the electrode 17 of the heating well is controlled according to the temperature data, thereby controlling the temperature inside the organic contaminated soil sealing treatment box 11;
the second pressure control line 28 connects the second pressure gauge 14 and the first fan 31 with the second pressure controller 23, so as to realize that the pressure data of the second pressure gauge 14 is fed back to the second pressure controller 23, and the first fan 31 is controlled according to the pressure data of the second pressure gauge 14, thereby realizing the control of the air intake of the condenser 33.
In the hydrocarbon contaminated soil remediation system based on the In-Situ Thermal Desorption (ISTD) device, the first pressure control line 26, the temperature control line 27, the second pressure control line 28 and the third pressure control line 29 are simultaneously connected to the In-Situ Thermal Desorption device 1, the control device 2, the gas-liquid separation device 3 and the activated carbon adsorption device 4, and the whole hydrocarbon contaminated soil remediation system is automatically controlled or manually controlled through the control device 2; the organic gas leading-out pipe 30 is connected with the in-situ thermal desorption device 1 and the gas-liquid separation device 3, and leads the organic gas volatilized in the organic contaminated soil sealing treatment box 11 into the condenser 33; the separated waste gas leading-out pipe 40 is connected with the gas-liquid separation device 3 and the activated carbon adsorption device 4, and guides the organic gas separated from the gas-liquid separation tank 37 into the activated carbon adsorption device 4; the exhaust detection device 5 monitors the gas in the exhaust pipe 48 in real time to ensure that the discharged gas reaches the standard; the master controller 20 collects and summarizes data of the first pressure controller 21, the temperature controller 22, the second pressure controller 23, the third pressure controller 24 and the data collector 50 through a master control system line 25, and realizes cooperative control of the whole hydrocarbon contaminated soil system.
In the soil remediation system, the in-situ thermal desorption device is adopted, heat can be transferred around the heating source in a radiation heating mode, the thermal remediation technology can be used for treating field pollutants with the boiling point higher than that of water, the organic pollutants can be extracted in a gas phase form by heating soil to improve the volatilization efficiency of the organic pollutants, waste gas is directly absorbed by activated carbon and is fully utilized, if the discharged tail gas can be directly combusted, secondary pollution is avoided, the concentration of the purified oil gas is detected in real time, and the standard emission after treatment can be ensured. Particularly, the in-situ thermal desorption device does not need vacuum equipment to generate negative pressure for gas export, and the fan controlled by the control device only conducts gas import and export through the air import pipe and the organic gas export according to the pressure in the in-situ thermal desorption device, thereby improving the safety of the whole system. The soil remediation system utilizing the in-situ thermal desorption device has good reference significance for developing economically and technically feasible land remediation methods.
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Examples
As shown in fig. 1, the present embodiment provides an ISTD-based hydrocarbon contaminated soil remediation system, including: the device comprises an in-situ thermal desorption device 1, a control device 2, a gas-liquid separation device 3, an activated carbon adsorption device 4 and an exhaust detection device 5.
Wherein, the in-situ thermal desorption device 1 comprises: an air inlet pipe 6, an air compressor 7, a first gas flowmeter 8, an electromagnetic valve 9, a first pressure gauge 10, an organic contaminated soil sealing treatment box 11, a first thermometer 12, a second thermometer 13, a second pressure gauge 14, a heater well porous shell 15, a heater well silicon carbide (SIC) rod 16, a heater well electrode 17, an organic gas outlet 18 and a heater well 19, wherein air enters the organic contaminated soil sealing treatment box 11 through the air inlet pipe 6 under the action of the air compressor 7, and is purged by adopting an air compressor, compressed air is generated by an air compressor 7 (the air flow is controlled by a first flow meter 8) to purge the in-situ thermal desorption device 1, hydrocarbon organic matters in the soil volatilize after the in-situ thermal desorption device is heated by a heating well 19 (the temperature in the box is monitored by a first thermometer 13 and a second thermometer 14), the gas is led out of the in-situ thermal desorption device 1 through the organic gas outlet 18 under the driving of the compressed air.
The gas-liquid separation device 3 includes: an organic gas leading-out pipe 30, a first fan 31, a condenser gas leading-in pipe 32, a condenser 33, a condensed waste liquid leading-out pipe 34, a waste liquid purification tank 35, a first gas-liquid separation tank leading-in pipe 36, a gas-liquid separation tank 37, a separated waste liquid leading-out pipe 38, a liquid level meter 39 and a separated waste gas leading-out pipe 40, wherein under the action of the first fan 31, the organic gas in the in-situ thermal desorption device 1 is led into the condenser 33, the high-temperature organic gas is cooled, part of steam is condensed to flow into the waste liquid purification tank 35, the condensed organic gas is led into the gas-liquid separation tank 37, waste liquid in the organic gas is separated, the waste liquid flows into the waste liquid purification tank 35, and the organic gas is led out of the.
The activated carbon adsorption device 4 includes: the second gas flow meter 41, the second blower 42, the gas introduction pipe 43, the activated carbon adsorption tank 44, the third thermometer 45, the third pressure gauge 46, and the fourth thermometer 47 introduce the organic gas in the gas-liquid separation device 3 into the activated carbon adsorption tank 44 (the third thermometer 45 and the fourth thermometer 47 measure the temperature of the upper and lower portions of the activated carbon tank) by the second blower 42 (the flow rate of the organic gas is controlled by the second gas flow meter 41), and the gas treated by the activated carbon tank is discharged into the air.
The exhaust gas detection device 5 includes: the exhaust pipe 48, the HC concentration detector 49, the data collector 50 and the data transmission line 51, the HC concentration detector 49 detects the gas in the exhaust pipe 48, the data collector 50 collects the data detected by the HC concentration detector 49 and transmits the data to the master controller 20 of the temperature and pressure control device 2 through the data line 51, and the air is discharged through the exhaust pipe 48 after the detection reaches the standard.
The control device 2 includes: the system comprises a master controller 20, a first pressure controller 21, a temperature controller 22, a second pressure controller 23, a third pressure controller 24, a master control system line 25, a first pressure control line 26, a temperature control line 27, a second pressure control line 28 and a third pressure control line 29, wherein the first pressure controller 21 controls the air compressor 7 through pressure data in the organic contaminated soil sealing treatment box 11 fed back by a first pressure gauge 10; the temperature controller controls the temperature of the heating well 19 through temperature data in the organic contaminated soil sealing treatment box 11 fed back by the first thermometer 12 and the second thermometer 13; the second pressure controller 23 in the control device 2 controls the first fan 31 through pressure data in the organic contaminated soil sealing treatment box 11 fed back by the second pressure gauge 14; the third pressure controller 24 controls the second fan 42 according to the pressure data in the activated carbon adsorption tank 44 fed back by the third pressure gauge 46, so as to adjust the pressure in the activated carbon adsorption tank 44; the master controller 20 judges whether the exhaust gas reaches the emission standard according to the data fed back by the data collector 50 in the exhaust gas detection device 5, when the activated carbon adsorption tank 44 is saturated by adsorption, the detection system 5 displays that the HC concentration exceeds the standard, and the master controller 20 in the control device 2 controls the whole hydrocarbon-contaminated soil system to close the whole system.
The in-situ thermal desorption device 1, the gas-liquid separation device 3, the activated carbon adsorption device 4 and the exhaust detection device 5 in the hydrocarbon contaminated soil remediation system are respectively connected with the warm-pressing control device 2, and the warm-pressing control device 2 can cooperatively control the in-situ thermal desorption device 1, the gas-liquid separation device 3 and the activated carbon adsorption device 4 to complete the hydrocarbon contaminated soil remediation process.
Specifically, an air inlet pipe 6 of the in-situ thermal desorption device 1 is communicated with the atmosphere, an air compressor 7 pumps air into the organic contaminated soil sealing treatment box 11 of the in-situ thermal desorption device 1 through a first gas flowmeter 8 and an electromagnetic valve 9, under the heating of the heating well 19, the low boiling point hydrocarbon organic matters in the organic polluted soil are volatilized and are led into the gas-liquid separation device 3 through the organic gas outlet 18, the organic gas is introduced into a condenser 33 under the action of a first fan 31, the condenser 33 cools the organic gas, part of the vapor is condensed into waste liquid to flow into a waste liquid purification tank 35, the condensed organic gas enters a gas-liquid separation tank 37, the waste liquid separated from the organic gas flows into the waste liquid purification tank 35, the residual organic gas enters an activated carbon adsorption tank 44 under the action of a second fan 42, and the organic gas treated by the activated carbon adsorption tank 44 is discharged into air after reaching the emission standard. The first pressure controller 21 in the control device 2 controls the air compressor 7 through pressure data in the organic contaminated soil sealing treatment box 11 fed back by the first pressure gauge 10, so that pressure regulation in the temperature and pressure control device 2 is realized; the temperature controller in the control device 2 controls the temperature of the heating well 19 through temperature data in the organic contaminated soil sealing treatment box 11 fed back by the first thermometer 12 and the second thermometer 13, so that the pressure in the temperature and pressure control device 2 is adjusted; the second pressure controller 23 in the control device 2 controls the first fan 31 through pressure data in the organic contaminated soil sealing treatment box 11 fed back by the second pressure gauge 14, so that pressure regulation in the temperature and pressure control device 2 is realized, and gas flow in the condenser 33 and the gas-liquid separation tank 37 in the gas-liquid separation device 3 is also regulated; the third pressure controller 24 in the control device 2 controls the second fan 42 according to the pressure data in the activated carbon adsorption tank 44 fed back by the third pressure gauge 46, so as to adjust the pressure in the activated carbon adsorption tank 44; the master controller 20 in the control device 2 judges whether the exhaust gas reaches the exhaust standard according to the data fed back by the data collector 50 in the exhaust detection device 5; when the activated carbon adsorption tank 44 is saturated, the detection system 5 indicates that the HC concentration exceeds the standard, the general controller 20 in the control device 2 controls the whole hydrocarbon-contaminated soil system, closes the whole system, and gives an alarm to notify the relevant technicians to replace the activated carbon in the activated carbon adsorption tank 44.
The soil remediation system provided by the embodiment of the invention has the following advantages:
(1) the method can repair the hydrocarbon polluted soil, and has good repairing effect on the polluted soil and good economic benefit by adsorbing the organic waste gas through the recyclable activated carbon.
(2) The method is suitable for repairing various hydrocarbon contaminated soil by adopting an in-situ repair technology, the number and the position arrangement of the heating wells can be selected according to the area size of the treated soil, the contaminated soil is treated and repaired in an optimal mode with the minimum cost, the cost can be greatly saved, and the number of the heating wells can be flexibly adjusted according to the requirement.
(2) The concentration of the discharged gas is taken as a control parameter, and the pressure and the temperature of the system are controlled by controlling the air compressor 7, the heating well 19, the first fan 31 and the second fan 42 through a control device by utilizing an electromechanical control technology, so that the operation of the whole system is controlled.
(3) The system has simple process flow, adopts skid-mounted equipment, and has simple equipment structure and low operating cost.
(4) The system adopts the activated carbon adsorption technology, and achieves the aims of high efficiency, low cost and recycling.
(5) The system can realize in-situ remediation of the polluted soil, has small pollution to the surrounding environment, realizes waste recycling, and meets the requirement of sustainable development.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in 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 (8)
1. An in-situ thermal desorption-based hydrocarbon contaminated soil remediation system, comprising:
the device comprises an in-situ thermal desorption device (1), a control device (2), a gas-liquid separation device (3), an activated carbon adsorption device (4) and an exhaust detection device (5); wherein,
the in-situ thermal desorption device (1) is respectively provided with an air inlet pipe (6), an organic gas outlet (18), a pressure control end and a temperature control end;
an organic gas outlet (18) of the in-situ thermal desorption device (1) is connected with an organic gas outlet pipe (30) of the gas-liquid separation device (3);
the gas-liquid separation device (3) is provided with a separated waste gas leading-out pipe (40), and the separated waste gas leading-out pipe (40) is connected with the activated carbon adsorption device (4);
the activated carbon adsorption device (4) is provided with an exhaust pipe (48), and the exhaust pipe (48) is connected with the exhaust detection device (5);
the control device (2) is respectively electrically connected with the pressure control end and the temperature control end of the in-situ thermal desorption device (1) through a first pressure control circuit (26) and a temperature control circuit (27), and can detect and control the pressure and the temperature of the in-situ thermal desorption device (1);
the control device (2) is electrically connected with the gas-liquid separation device (3) through a second pressure control circuit (28) and can control the pressure of the gas-liquid separation device (3);
the control device (2) is electrically connected with the activated carbon adsorption device (4) through a third pressure control circuit (29) and can control the pressure of the activated carbon adsorption device (4);
the exhaust gas detection device (5) is provided with a data transmission line (51), the control device (2) is in communication connection with the exhaust gas detection device (5) through the data transmission line (51), and gas emission can be controlled according to the detection result of the exhaust gas detection device (5).
2. An in-situ thermal desorption based hydrocarbon contaminated soil remediation system according to claim 1, wherein the in-situ thermal desorption apparatus (1) comprises:
the air inlet pipe (6), the air compressor (7), the first gas flowmeter (8), the solenoid valve (9), the first manometer (10), the organic contaminated soil sealing treatment case (11), the first thermometer (12), the second thermometer (13), the second manometer (14), the heating well device and the organic gas export (18), wherein:
one end of the air inlet pipe (6) is communicated with the outside, and the other end of the air inlet pipe is connected with the organic contaminated soil sealing treatment box (11) through the air compressor (7), the first gas flowmeter (8) and the electromagnetic valve (9) in sequence;
the organic contaminated soil sealing treatment box (11) is provided with the organic gas outlet (18);
the control end of the air compressor (7) is a pressure control end;
the heating well device is arranged in the organic contaminated soil sealing treatment box (11);
the first pressure gauge (10) is connected with the inside of the organic contaminated soil sealing treatment box (11);
the detection end of the first pressure gauge (10) and the control end of the air compressor (7) are used as pressure control ends;
the second pressure gauge (14) is connected to the organic gas outlet (18) inside the organic contaminated soil sealing treatment box (11);
the first thermometer (12) and the second thermometer (13) are respectively connected with the organic contaminated soil sealing treatment box (11);
the detection ends of the first thermometer (12) and the second thermometer (13) and the control end of the heating well device are used as temperature control ends.
3. The in-situ thermal desorption-based hydrocarbon contaminated soil remediation system of claim 2, wherein said heater-well device comprises: the heating wells are arranged in the organic contaminated soil sealing treatment box (11) in parallel;
the heater well structures are the same, and every heater well includes: a heating well porous shell (15), a heating well silicon carbide rod (16) and a heating well electrode (17); wherein, establish heating well carborundum rod (16) in heating well porous shell (15), heating well carborundum rod (16) upper end sets up heating well electrode (17), the upper end of heating well electrode (17) is the control end.
4. The in-situ thermal desorption-based hydrocarbon contaminated soil remediation system according to claim 1, wherein the gas-liquid separation device (3) comprises:
an organic gas leading-out pipe (30), a first fan (31), a condenser gas leading-in pipe (32), a condenser (33), a condensed waste liquid leading-out pipe (34), a waste liquid purification tank (35), a first gas-liquid separation tank leading-in pipe (36), a gas-liquid separation tank (37), a separated waste liquid leading-out pipe (38), a liquid level meter (39) and a separated waste gas leading-out pipe (40); wherein,
one end of the organic gas leading-out pipe (30) is a connecting end connected with an organic gas leading-out port (18) of the in-situ thermal desorption device (1), and the other end of the organic gas leading-out pipe (30) is connected with a first fan (31);
the first fan (31) is connected with the condenser (33) through the condenser gas inlet pipe (32);
the condenser (33) is respectively provided with a condensed waste liquid leading-out pipe (34) and a gas-liquid separation tank leading-in pipe (36), the condensed waste liquid leading-out pipe (34) is connected with the waste liquid collecting tank (35), and the gas-liquid separation tank leading-in pipe (36) is connected with a gas-liquid separation tank (37);
the gas-liquid separation tank (37) is respectively provided with a separated waste liquid eduction tube (38) and a separated waste gas eduction tube (40), and the separated waste liquid eduction tube (38) is connected with the waste liquid purification tank (35).
5. An in-situ thermal desorption based hydrocarbon contaminated soil remediation system according to claim 1, wherein said activated carbon adsorption device (4) comprises:
a second gas flowmeter (41), a second fan (42), a gas inlet pipe (43), an activated carbon adsorption tank (44), a third thermometer (45), a third pressure gauge (46), a fourth thermometer (47) and the exhaust pipe (48); wherein,
the activated carbon adsorption tank (44) is respectively provided with a gas inlet pipe (43) and an exhaust pipe (48);
the second gas flowmeter (41) and the second fan (42) are sequentially connected with a gas inlet pipe (43) of the activated carbon adsorption tank (44);
the second gas flowmeter (41) is provided with a connecting end connected with a separated waste gas outlet pipe (40) of the gas-liquid separation device (3);
the third thermometer (45), the third pressure gauge (46) and the fourth thermometer (47) are respectively arranged on the activated carbon adsorption tank (44);
and the third pressure gauge (46) and the control end of the second fan (42) are electrically connected with the control device through the third pressure control line (29).
6. The in-situ thermal desorption-based hydrocarbon contaminated soil remediation system according to claim 5, wherein the third temperature gauge (45) is connected to an upper portion of the activated carbon adsorption tank (44), and the fourth temperature gauge (47) is connected to a lower portion of the activated carbon adsorption tank (44).
7. An in-situ thermal desorption based hydrocarbon contaminated soil remediation system according to claim 1, wherein the exhaust gas detection device (5) comprises:
an HC concentration detector (49), a data collector (50) and the data transmission line (51); wherein,
the HC concentration detector (49) is connected with an exhaust pipe (48) of the active carbon adsorption device (4) and can monitor gas in the exhaust pipe (48);
the data acquisition unit is provided with a data transmission line (51);
the data acquisition unit (50) is electrically connected with the HC concentration detector (49), and can transmit the data acquired by the HC concentration detector (49) to the control device (2) through the data transmission line (51).
8. The system for remediating hydrocarbon contaminated soil based on in-situ thermal desorption as claimed in any one of claims 1 to 7, wherein the control device (2) comprises:
a master controller (20), a first pressure controller (21), a temperature controller (22), a second pressure controller (23), a third pressure controller (24), a master control line (25), the first pressure control line (26), the temperature control line (27), the second pressure control line (28), and the third pressure control line (29); wherein,
the first pressure controller (21) is electrically connected with a first pressure gauge (10) and an air compressor (7) of the in-situ thermal desorption device (1) through the first pressure control line (26), and can control the pressure in the in-situ thermal desorption device (1) by controlling the air compressor (7) according to the pressure in the in-situ thermal desorption device (1) detected by the first pressure gauge (10);
the temperature controller (22) is electrically connected with the first thermometer (12) and the second thermometer (13) of the in-situ thermal desorption device (1) and the control end of the well heating device through the temperature control circuit (27), and can control the well heating device to control the temperature in the in-situ thermal desorption device (1) according to the temperature in the in-situ thermal desorption device (1) detected by the first thermometer (12) and the second thermometer (13);
the second pressure controller (23) is respectively electrically connected with a second pressure gauge (14) of the in-situ thermal desorption device (1) and a first fan (31) of the gas-liquid separation device (3) through the second pressure control line (28), and can control the first fan (31) according to the pressure at the organic gas outlet (18) of the in-situ thermal desorption device (1) detected by the second pressure gauge (14);
the third pressure controller (24) is respectively electrically connected with a third pressure gauge (46) of the activated carbon adsorption device (4) and a second fan (42) through a third pressure control line (29), and can control the second fan (42) according to the pressure in the activated carbon adsorption device (4) detected by the third pressure gauge (46);
the master controller (20) is electrically connected with the first pressure controller (21), the temperature controller (22), the second pressure controller (23) and the third pressure controller (24) through the master control circuit (25);
the master controller (20) is electrically connected with a data transmission line (51) of the exhaust detection device (5) through the master control line (25).
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| CN114323144A (en) * | 2021-12-30 | 2022-04-12 | 北京建工环境修复股份有限公司 | In-situ thermal desorption engineering operation monitoring method, device and system |
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