CN111468528A - Efficient smoldering system for soil remediation - Google Patents
Efficient smoldering system for soil remediation Download PDFInfo
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- CN111468528A CN111468528A CN201911266422.2A CN201911266422A CN111468528A CN 111468528 A CN111468528 A CN 111468528A CN 201911266422 A CN201911266422 A CN 201911266422A CN 111468528 A CN111468528 A CN 111468528A
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- injection well
- gas injection
- well
- reducing agent
- extraction
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- 239000002689 soil Substances 0.000 title claims abstract description 37
- 238000005067 remediation Methods 0.000 title claims abstract description 26
- 238000002347 injection Methods 0.000 claims abstract description 94
- 239000007924 injection Substances 0.000 claims abstract description 94
- 238000000605 extraction Methods 0.000 claims abstract description 38
- 238000005485 electric heating Methods 0.000 claims abstract description 13
- 239000003638 chemical reducing agent Substances 0.000 claims description 38
- 238000012544 monitoring process Methods 0.000 claims description 29
- 238000002485 combustion reaction Methods 0.000 claims description 14
- 238000003860 storage Methods 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 5
- 239000003814 drug Substances 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 description 19
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 239000003344 environmental pollutant Substances 0.000 description 7
- 231100000719 pollutant Toxicity 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 4
- 238000003795 desorption Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 239000008346 aqueous phase Substances 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 230000003115 biocidal effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000011280 coal tar Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
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
- B09C1/065—Reclamation of contaminated soil thermally by pyrolysis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
- B09C1/062—Reclamation of contaminated soil thermally by using electrode or resistance heating elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- 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)
Abstract
The invention provides a high-efficiency smoldering system for soil remediation, which comprises a gas injection well, an electric heating rod, at least two slotted sections, one slotted section is arranged at the bottom end of the gas injection well, the upper end of the gas injection well is connected with a gas injection fan, extraction wells are arranged around the gas injection well, the slotted sections are arranged at the bottom end of each extraction well, and the extraction wells are connected with extraction fans.
Description
Technical Field
The invention relates to an efficient smoldering system for repairing polluted soil.
Background
Aiming at the soil polluted by non-aqueous phase liquid (NAP L s) such as coal tar and the like consisting of aromatic hydrocarbon and long-chain hydrocarbon, as the pollutants have the characteristics of high boiling point, strong antibiotic degradability and the like, a large amount of energy is required to be input into the soil for the pollutants to be repaired to reach the standard by a common repairing method such as in-situ thermal desorption.
By using the smoldering combustion technology (STAR), slow smoldering combustion can be generated on the surface of NAP L s, organic substances are mainly converted into heat, carbon dioxide and water, and the occurrence of smoldering reaction can be ensured only by inputting a small amount of energy.
At present, smoldering technology is widely applied abroad and is still in the beginning stage at home. Since smoldering combustion technology reacts with underground organic pollutants as an energy source, the content of pollutants is an important factor in determining smoldering reactions. The underground soil is a heterogeneous medium, so that the distribution of pollutants is not uniform, and when the smoldering reaction is carried out to an area with low pollutant concentration, the speed of the smoldering reaction is reduced and even stopped. In the earlier stage of smoldering reaction, a large amount of high-temperature oxidant (hot air) needs to be injected into soil, so that the thermal desorption phenomenon of partial pollutants occurs firstly before the smoldering reaction occurs, and a smoldering system needs to be provided with tail gas treatment equipment to purify the extracted tail gas.
Disclosure of Invention
The invention aims to solve the problems and develop a set of efficient smoldering system for soil remediation, which solves the problems.
In order to achieve the purpose, the invention adopts the technical scheme that:
an efficient smoldering combustion system for soil remediation, comprising:
the gas injection well extends into a NAP L s polluted area, an electric heating rod is arranged in the gas injection well, and a slotted section is arranged at the depth part of the gas injection well corresponding to the NAP L s polluted area;
and the extraction wells are distributed around the gas injection well, each extraction well is also provided with the slot section, the extraction wells are connected with extraction fans, the extraction fans are communicated to the gas storage tank, one path of outlet of the gas storage tank is communicated with a tail gas treatment device through a pipeline, and the other path of outlet of the gas storage tank is communicated with the gas injection well through a tail gas backflow pipeline in a backflow mode.
The high-efficiency smoldering system for soil remediation, wherein: the effective heating length of the electric heating rod is the length below the ground surface of the whole gas injection well.
The efficient smoldering system for soil remediation is characterized in that the gas injection well is provided with at least two slotted sections which are arranged at intervals in a depth part corresponding to a NAP L s polluted area, and one slotted section is arranged at the bottom end of the gas injection well.
The high-efficiency smoldering system for soil remediation, wherein: and three extraction wells are distributed around each gas injection well in a triangular manner by taking the gas injection well as the center.
The high-efficiency smoldering system for soil remediation, wherein: and a pressure sensor is arranged at the upper port of the extraction well and used for monitoring the underground soil pressure.
The efficient smoldering system for soil remediation is characterized in that four temperature monitoring wells are further arranged around each gas injection well in a NAP L s pollution area, the distances between the four temperature monitoring wells and the gas injection wells are sequentially increased, each temperature monitoring well is provided with three temperature monitoring points which are uniformly distributed, two temperature monitoring points are distributed in the NAP L s pollution area, and one temperature monitoring point is located above the NAP L s pollution area.
The efficient smoldering system for soil remediation is characterized in that a reducing agent injection well is arranged on the boundary region of the NAP L s pollution area, the reducing agent injection well is provided with cutting seam sections with the same number as that of the gas injection wells, the upper end of the reducing agent injection well is connected with a reducing agent injection pump, and a medicine injection pipeline of the reducing agent injection well is provided with a side opening for adding a reducing agent.
The high-efficiency smoldering system for soil remediation, wherein: the top of the reducing agent injection well is also provided with a rapid agent detection device which is connected to a central control system, and the central control system is in signal connection with the reducing agent injection pump, so that the air pressure and the air volume of the injection pump are adapted to the concentration of the reducing agent in the reducing agent injection well.
The high-efficiency smoldering system for soil remediation, wherein: sampling holes are arranged on the extraction branch pipes of each extraction well.
The high-efficiency smoldering system for soil remediation, wherein: each slot section is provided with a plurality of slots, the slot direction is vertical to the extending direction of the well, each slot is 2-3mm wide and 5-8cm long, the circumferential distance is 2.5-3cm, the axial distance is 3-5cm, and two rows of axially adjacent slots are staggered in the circumferential direction.
The invention can efficiently carry out the smoldering reaction and reduce unnecessary tail gas treatment equipment.
Drawings
FIG. 1 is a schematic structural diagram of a high efficiency smoldering system of the present invention directed to soil remediation.
FIG. 2 is a schematic diagram of a gas injection well (extraction well, reducing agent injection well) with a slotted section.
The reference numbers indicate that the electric heating rod 1, the slotting section 2, the gas injection well 3, the power cord 4, the temperature monitoring point 5, the temperature monitoring well 6, the NAP L s pollution area 7, the non NAP L s area 8, the extraction well 9, the pressure sensor 10, the manual regulating valve 11, the tail gas backflow pipeline 12, the gas injection fan 13, the extraction fan 14, the gas storage tank 15, the chimney 16, the soil hardening ground 17, the central control system 18, the sampling hole 19, the rapid reagent detection device 20, the reducing agent injection pump 21, the reducing agent injection well 22 and the activated carbon tank 23.
Detailed Description
As shown in fig. 1, the present invention provides a high efficiency smoldering system for soil remediation, comprising:
the gas injection well 3 extends into a NAP L s polluted area 7, an electric heating rod 1 is arranged in the gas injection well 3, the effective heating length of the electric heating rod 1 is the length below the ground of the whole gas injection well 3, at least two slotted sections 2 which are arranged at intervals are arranged at the depth part of the NAP L s polluted area 7 of the gas injection well 3, one slotted section 2 is arranged at the bottom end of the gas injection well 3 (namely the bottom end of the NAP 83 s area), each slotted section 2 is provided with a plurality of slots, the direction of the slots is vertical to the extending direction of the gas injection well 3, each slot is 2-3mm wide, 5-8cm long, 2.5-3cm in circumferential distance and 3-5cm in axial distance, two rows of axially adjacent slots are staggered in the circumferential direction, a three-way valve is arranged at the upper end of the gas injection well 3, one way of the three-way valve is connected with a power line 4 of the electric heating rod, one way is connected with a gas injection fan 13 through a gas injection pipeline, and one way is connected with a gas storage tank 15 through a tail gas return pipeline 12, the number of the gas injection well 3 and the interval is determined according to the actual condition;
the extraction wells 9 are distributed around each gas injection well 3 in a triangular shape by taking each gas injection well 3 as a center; the bottom end of each extraction well 9 is provided with the slotted section 2, and the slotted size is the same as that of the gas injection well 3; the upper port of the extraction well 9 is provided with a pressure sensor 10 for monitoring the underground soil pressure, and the extraction branch pipe of each extraction well 9 is provided with a sampling hole 19 with the aperture of 50 mm; the extraction well 9 is communicated with the gas storage tank 15 through an extraction fan 14 and is used for injecting extracted tail gas into the gas storage tank 15, one path of an outlet of the gas storage tank 15 is communicated with the gas injection well 3 through the tail gas return pipeline 12, and the other path of the outlet is connected to a chimney 16 for discharging after being purified by an activated carbon tank 23;
four temperature monitoring wells 6 are arranged in the NAP L s polluted area 7, and the distances between the four temperature monitoring wells and the gas injection well 3 are sequentially increased (for example, the distances are 0.5, 1.5, 2.5 and 3.5 meters respectively);
the reducing agent injection well 22 is arranged on the boundary area of the NAP L s pollution area 7 and is provided with the slotted sections 2 with the same number as the gas injection well 3, the upper end of the reducing agent injection well 22 is connected with a reducing agent injection pump 21, and a medicine injection pipeline of the reducing agent injection well 22 is provided with a bypass opening for adding a reducing agent;
and the central control system 18 is in signal connection with the electric heating rod 1, the power line 4, the gas injection fan 13, the reducing agent injection pump 21, the temperature monitoring well 6 and the rapid medicament detection device 20.
Compared with the prior smoldering combustion technology, the invention is provided with 1-2 discontinuous slotting sections 2 in the NAP L s pollution area 7 besides the slotting section 2 at the bottom end of the gas injection well 3, and ensures that the gas injection well 3 has 2-3 gas injection positions by utilizing a plurality of openings of the gas injection well 3, so that smoldering combustion reaction has a plurality of reaction starting points and reaction paths.
The invention provides an electric heating rod 1 which heats the soil surface to the lower surface of an NAP L s area, and the electric heating rod can increase the temperature of injecting air into the NAP L s area and quicken the smoldering reaction and can repair a light pollution area except for an NAP L s pollution area 7 in a thermal desorption mode.
The invention is characterized in that a gas storage tank 15 is arranged at the tail end of an extraction pipeline to store the gas, after the smoldering reaction occurs, the gas in the gas storage tank 15 is converged with air in an air injection pipeline through a tail gas backflow pipeline 12 to enter a gas injection well 3 and then enter the smoldering reaction, and the part of gas is finally converted into carbon monoxide, carbon dioxide and water vapor and is discharged after the treatment.
The extraction branch pipe of each extraction well 9 is provided with a sampling port for rapidly detecting the content of carbon dioxide, carbon monoxide, water vapor and other smoldering products on site, monitoring tail gas and analyzing the content of organic pollutants. When the contents of carbon monoxide, carbon dioxide and water vapor in the gas in the pipeline far exceed the air content, the smoldering reaction is indicated to occur. When the organic matter content in the many times of tail gas testing results all reaches standard, further explain the smoldering reaction and take place, and need not to set up corresponding tail gas processing apparatus again, can close electric heating rod 1 this moment, only inject normal atmospheric temperature air into soil and can maintain the smoldering reaction, close tail gas backflow passageway simultaneously, extract tail gas and handle direct emission. A pressure sensor 10 is arranged above each extraction well 9, and when extraction is not carried out, the pressure sensor is used for monitoring the site pressure without additionally drilling a well to monitor the pressure.
A reducing agent injection well 22 is arranged outside a NAP L s pollution boundary, reducing agent is added through an injection pipeline, the concentration of the reducing agent is detected by a rapid agent detection device 20 and is transmitted to a central control device, and the concentration of the reducing agent is adjusted by adjusting the wind pressure and the wind volume of a reducing agent injection pump 13.
According to the fact that the radius of influence of smoldering reactions is about 3-4 meters, four temperature monitoring wells 6 are arranged around each gas injection well 3 and are respectively 0.5 meter, 1.5 meter, 2.5 meter and 3.5 meters away from a heating well, the occurrence time, the radius of influence, the reaction rate and the like of the smoldering reactions can be accurately and timely confirmed, two temperature measuring points are arranged on each temperature monitoring well 6 in a NAP L s pollution area 7 and used for monitoring the conditions of the smoldering reactions, and therefore the smoldering effect (pollutant removal effect) is determined, and a monitoring point is arranged outside a NAP L s area and used for monitoring the thermal desorption temperature.
The gas injection fan 13, the extraction fan 14 and the reducing agent injection pump 21 related to the smoldering system are all variable frequency fans, and the wind pressure and the wind volume of the fans can be flexibly adjusted according to the field temperature, the tail gas components, the reducing agent content and the like, so that the smoldering efficiency is improved, and the operation safety is ensured.
The data of the temperature monitoring well 6 in the smoldering system can be remotely transmitted to the central control system 18, and the central control system 18 can remotely control the operation and the stop of the heating rods in each gas injection well 3. The reducing agent monitoring data in the smoldering system can be remotely transmitted to the central control system 18, and the central control system 18 can remotely control the air volume and the air pressure of each reducing agent injection pump 21.
The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. An efficient smoldering combustion system for soil remediation, comprising:
the gas injection well extends into a NAP L s polluted area, an electric heating rod is arranged in the gas injection well, and a slotted section is arranged at the depth part of the gas injection well corresponding to the NAP L s polluted area;
and the extraction wells are distributed around the gas injection well, each extraction well is also provided with the slot section, the extraction wells are connected with extraction fans, the extraction fans are communicated to the gas storage tank, one path of outlet of the gas storage tank is communicated with a tail gas treatment device through a pipeline, and the other path of outlet of the gas storage tank is communicated with the gas injection well through a tail gas backflow pipeline in a backflow mode.
2. The high efficiency smoldering combustion system for soil remediation of claim 1, further comprising: the effective heating length of the electric heating rod is the length below the ground surface of the whole gas injection well.
3. The high efficiency smoldering combustion system for soil remediation according to claim 1, wherein the gas injection well is provided with at least two slotted sections arranged at intervals at a depth portion corresponding to a NAP L s contaminated area, and one of the slotted sections is arranged at a bottom end of the gas injection well.
4. The high efficiency smoldering combustion system for soil remediation of claim 1, further comprising: and three extraction wells are distributed around each gas injection well in a triangular manner by taking the gas injection well as the center.
5. The high efficiency smoldering combustion system for soil remediation of claim 1, further comprising: and a pressure sensor is arranged at the upper port of the extraction well and used for monitoring the underground soil pressure.
6. The efficient smoldering system for soil remediation according to claim 1, wherein four temperature monitoring wells are further arranged around each gas injection well in the NAP L s pollution area, the distances between the four temperature monitoring wells and the gas injection wells are sequentially increased, each temperature monitoring well is provided with three temperature monitoring points which are uniformly distributed, two temperature monitoring points are distributed in the NAP L s pollution area, and one temperature monitoring point is located above the NAP L s pollution area.
7. The efficient smoldering system for soil remediation according to claim 1, wherein a reducing agent injection well is arranged at a boundary region of a NAP L s pollution area, the reducing agent injection well is provided with the same number of slotted sections as the gas injection wells, the upper end of the reducing agent injection well is connected with a reducing agent injection pump, and a medicine injection pipeline of the reducing agent injection well is provided with a bypass opening for adding a reducing agent.
8. The high efficiency smoldering combustion system for soil remediation of claim 7, wherein: the top of the reducing agent injection well is also provided with a rapid agent detection device which is connected to a central control system, and the central control system is in signal connection with the reducing agent injection pump, so that the air pressure and the air volume of the injection pump are adapted to the concentration of the reducing agent in the reducing agent injection well.
9. The high efficiency smoldering combustion system for soil remediation of claim 1, further comprising: sampling holes are arranged on the extraction branch pipes of each extraction well.
10. The high efficiency smoldering combustion system for soil remediation of claim 1, further comprising: each slot section is provided with a plurality of slots, the slot direction is vertical to the extending direction of the well, each slot is 2-3mm wide and 5-8cm long, the circumferential distance is 2.5-3cm, the axial distance is 3-5cm, and two rows of axially adjacent slots are staggered in the circumferential direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911266422.2A CN111468528B (en) | 2019-12-11 | 2019-12-11 | Efficient smoldering system for soil remediation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911266422.2A CN111468528B (en) | 2019-12-11 | 2019-12-11 | Efficient smoldering system for soil remediation |
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| CN111468528A true CN111468528A (en) | 2020-07-31 |
| CN111468528B CN111468528B (en) | 2024-06-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112453043A (en) * | 2020-11-04 | 2021-03-09 | 吉林大学 | Method for strengthening smoldering of low-concentration petroleum organic polluted soil |
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| CN112453043B (en) * | 2020-11-04 | 2022-02-22 | 吉林大学 | Method for strengthening smoldering of low-concentration petroleum organic polluted soil |
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| Publication number | Publication date |
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| CN111468528B (en) | 2024-06-25 |
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