CN112642846A - Heating well structure for in-situ gas thermal desorption technology - Google Patents
Heating well structure for in-situ gas thermal desorption technology Download PDFInfo
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- CN112642846A CN112642846A CN202011385949.XA CN202011385949A CN112642846A CN 112642846 A CN112642846 A CN 112642846A CN 202011385949 A CN202011385949 A CN 202011385949A CN 112642846 A CN112642846 A CN 112642846A
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- heating
- pipe
- thermal desorption
- well structure
- temperature
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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
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
Abstract
The invention discloses a heating well structure for an in-situ gas thermal desorption technology, which comprises a heating inner pipe and a heating outer pipe, wherein the central axis of the heating inner pipe is superposed with the central axis of the heating outer pipe, the heating inner pipe is sequentially provided with an upper medium-temperature region, a medium-temperature region and a lower low-temperature region from top to bottom, the outer surface of the upper medium-temperature region is provided with a low-density spiral, the outer surface of the medium-temperature region is not treated, the outer surface of the lower low-temperature region is provided with a high-density spiral, and the bottom end of the heating outer pipe is provided. The invention has reasonable structural design, increases the spiral structure according to the temperatures of the heating pipe at different underground positions, and sets the pitch according to the temperature, thereby increasing the retention time and the retention distance of high-temperature flue gas in the heating pipe, being beneficial to the uniform distribution of heating energy in the vertical direction, effectively improving the in-situ thermal desorption repair effect and efficiency, obviously reducing the operation energy consumption and saving the gas resources.
Description
Technical Field
The invention relates to the field of soil remediation, in particular to a heating well structure for an in-situ gas thermal desorption technology.
Background
The thermal desorption technique of contaminated soil is classified into an in-situ thermal desorption technique and an ex-situ thermal desorption technique depending on whether the soil is excavated. The in-situ thermal desorption technology can effectively degrade and remove pollutants such as chlorine-containing organic compounds (CVOCs), benzene series (BTEX), petroleum hydrocarbons (TPH), mercury (Hg), pesticides, polychlorinated biphenyls (PCBs), dioxin and the like, can also treat free phase pollutants (NAPL), and is suitable for organic pollution sites such as coking plants, steel plants, coal gas plants, petrochemical plants, underground oil depots, pesticide plants and the like. The principle is that the temperature of soil in a polluted area is improved by well drilling and heating (gas, steam or electric heating and the like), so that the physicochemical properties of pollutants in the polluted area are changed: the vapor pressure and the solubility are increased, the viscosity, the surface tension, the Henry coefficient and the soil-water distribution coefficient are reduced, the concentration of the pollutants in a gas phase or a liquid phase is increased, and the removal rate of the pollutants by liquid phase extraction or soil vapor phase extraction is improved. After the soil is heated, VOCs and SVOCs in the soil can be gasified and pyrolyzed, and are extracted in a gaseous form, and the volatilized gaseous product is subjected to related purification treatment according to substances contained in the gaseous product, so that secondary utilization of energy or standard emission can be realized.
The existing heating equipment adopts a heating sleeve form more, and finds that the temperature difference of the heating sleeve is larger in different underground depths due to different soil moisture content and soil lithology in the practical application process, so that the soil repairing effects of different depths are different in the same heating time, and the combustion tail gas has shorter retention time in the heating sleeve, so that the problem of larger energy loss occurs, and certain defects exist.
Disclosure of Invention
The invention aims to provide a heating well structure for an in-situ gas thermal desorption technology, which increases the retention time and the retention distance of high-temperature flue gas in a heating pipe, improves the in-situ thermal desorption repair effect and efficiency, reduces the operation energy consumption and saves the gas resource.
The invention is realized by the following steps:
a heating well structure for an in-situ gas thermal desorption technology comprises a heating inner pipe and a heating outer pipe, wherein the central axis of the heating inner pipe is coincided with the central axis of the heating outer pipe;
the heating inner pipe is sequentially provided with an upper medium temperature area, a medium-high temperature area and a lower low temperature area from top to bottom, a low-density spiral is arranged on the outer surface of the upper medium temperature area, the outer surface of the medium-high temperature area is not processed, a high-density spiral is arranged on the outer surface of the lower low temperature area, and a plugging piece is arranged at the bottom end of the heating outer pipe.
The welding of heating inner tube top has the first ring flange that is used for sealed isolated inside and outside tail gas, the welding of heating outer tube top has the second ring flange that is used for connecting burning furnace.
And the top of the heating outer pipe is provided with a heat insulation layer.
And a tail gas outlet is formed in the top of the heating outer pipe and is used for being connected with a tail gas pipeline.
The low-density spiral and the high-density spiral outer end are attached to the inner wall of the heating outer pipe.
The heating inner pipe is made of stainless steel high-temperature resistant materials.
The heating outer pipe is made of carbon steel heat conduction materials.
(1) The spiral structure is added to the inner pipe of the heating sleeve according to different depths of the heating sleeve in the soil layer, the flow field of high-temperature flue gas in the outer sleeve is disturbed due to the increase of the spiral form, the retention time and the retention distance of the high-temperature flue gas in the outer sleeve are increased, the contact time of the high-temperature flue gas and the soil is increased, the promotion effect on the conduction of the heat of the high-temperature flue gas is achieved, the energy utilization rate is effectively improved, and the fuel is saved.
(2) The spiral heating device has reasonable structural design, and the screw pitch of the spiral is correspondingly changed according to the temperature change of the heating sleeve at different depths, so that the temperature fields of the heating sleeve at different depths are basically consistent, and the soil remediation effect is greatly improved.
Drawings
FIG. 1 is a plan view of a heater well configuration for in situ gas thermal desorption techniques of the present invention.
In the figure, 1, an inner tube is heated; 2. heating the outer tube; 3. an upper medium temperature zone; 4. a medium-high temperature zone; 5. a lower low temperature zone; 6. a low density helix; 7. a high density spiral; 8. a blocking member; 9. a first flange plate; 10. a second flange plate; 11. a heat-insulating layer; 12. and a tail gas outlet.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1, a heater well structure for in-situ gas thermal desorption technology includes an inner heating tube 1 and an outer heating tube 2, and the central axes of the inner heating tube 1 and the outer heating tube 2 coincide with each other. The heating well structure comprises two parts, namely a heating inner pipe 1 and a heating outer pipe 2, wherein fuel gas (generally methane, ethane, propane, butane or mixed gas) and air are ignited through a combustion head and are combusted in a hearth, the length of flame can exceed the length of the hearth, the combustion is continued in the heating inner pipe 1, and combustion tail gas reaches the bottom of the heating outer pipe 2 through the inside of the heating inner pipe 1 and reversely returns to the ground through an interlayer between the heating inner pipe 1 and the heating outer pipe 2.
The heating inner tube 1 is sequentially provided with an upper middle temperature area 3, a middle and high temperature area 4 and a lower low temperature area 5 from top to bottom, a low-density spiral 6 is arranged on the outer surface of the upper middle temperature area 3, the outer surface of the middle and high temperature area 4 is not processed, a high-density spiral 7 is arranged on the outer surface of the lower low temperature area 5, and a plugging piece 8 is arranged at the bottom end of the heating outer tube 2. Generally, the vertical temperature distribution in field heating is such that the upper temperature is the second highest, the middle temperature is high, and the lower temperature is low. The upper part of the temperature is second highest, and the main reason is that the soil heat diffuses to the ground surface; the heat conduction efficiency is higher in the area with high temperature in the middle; the lower low temperature zone is formed mainly because the water content in the lower part of the soil is higher than that in the upper part, and the water phase change energy is higher.
The heating inner tube 1 is divided into an upper middle temperature zone 3, a middle high temperature zone 4, and a lower low temperature zone 5 according to the temperature of the heating inner tube 1. Because the temperature of the upper part of the heating inner tube 1 is second high, the surface of the upper middle temperature zone 3 is provided with the low-density spiral 6 to increase the retention time of the gas tail gas; the middle part of the heating inner pipe 1 has high temperature and high heat conduction efficiency, and no spiral is needed; the bottom of the heating inner tube 1 is low in temperature, the energy utilization rate can be effectively improved by increasing the tail gas residence time of the lower low-temperature zone 5, and the spiral pitch is smaller than that of the upper part of the heating inner tube 1. In actual design, the number of different segmented threads and the pitch of the heating inner pipe 1 are designed according to water content distribution and soil lithology distribution in the vertical direction of the field.
The welding of 1 top of heating inner tube has the first ring flange 9 that is used for sealed isolated inside and outside tail gas, the welding of 2 tops of heating outer tube has the second ring flange 10 that is used for connecting burning furnace. The first flange plate 9 is mainly used for fixing and sealing and isolating tail gas inside and outside, and the second flange plate 10 is used for connecting a combustion furnace and mainly used for fixing and supporting.
And the top of the heating outer pipe 2 is provided with a heat preservation layer 11. The top of the heating outer pipe 2 is provided with the heat preservation layer 11, so that the energy loss at the top of the heating outer pipe 2 can be relieved, and the energy utilization rate is effectively improved.
And a tail gas outlet 12 is arranged at the top of the heating outer pipe 2, and the tail gas outlet 12 is used for being connected with a tail gas pipeline. The tail gas that the gas produced after burning in heating inner tube 1 and heating outer tube 2 enters into the tail gas pipeline from tail gas export 12 and handles the back emission, has reduced the pollution that the gas burning caused the environment.
The outer ends of the low-density spiral 6 and the high-density spiral 7 are attached to the inner wall of the heating outer tube 2. The outer end of the low-density spiral 6 and the outer end of the high-density spiral 7 are attached to the inner wall of the heating outer pipe 2, tail gas is reduced, the gap directly moves upwards, the residence time and the residence distance of high-temperature flue gas in the outer sleeve are increased, the contact time of the high-temperature flue gas and soil is increased, promotion effect is achieved for the derivation of high-temperature flue gas heat, the energy utilization rate is effectively improved, and fuel is saved.
The heating inner pipe 1 is made of stainless steel high-temperature-resistant materials, and the heating outer pipe 2 is made of carbon steel heat conduction materials. Flame in the burning furnace at first enters into heating inner tube 1, 1 temperature rise in the heating inner tube is very fast, heating inner tube 1 adopts stainless steel high temperature resistant material can reduce the heat loss of heating inner tube 1, the life of heating inner tube 1 has been improved greatly, the heat that the gas combustion produced is transmitted to polluting in the soil through heating outer tube 2 afterwards, when heating outer tube 2 adopts carbon steel heat-conducting material, can be great limit ground with heat transfer to polluting in the soil, and then promote the prosthetic effect of soil.
When the heating well structure of the in-situ gas thermal desorption technology is used for soil remediation, the heating well structure is implemented according to the following steps:
(1) surveying and positioning: and according to the results of soil investigation and risk assessment, determining the soil restoration range and scale, measuring and positioning on site, and determining the restoration boundary.
(2) Equipment installation: the drilling operation of heating well is carried out in polluting soil restoration border to use the rig, accomplishes the drilling operation back of heating well, will heat inner tube 1 and heating outer tube 2 and insert the well drilling in, use the ring flange to install heating outer tube 2 butt joint on burning furnace to be connected tail gas outlet 12 and outside tail gas pipeline, avoid the tail gas that the gas burning produced directly to discharge in the air, reduced the pollution that the gas burning caused the environment effectively.
(3) Soil remediation: after the heating well structure of the in-situ gas thermal desorption is installed, the soil remediation operation can be carried out. The method comprises the following specific steps: and opening a feeding switch of the fuel gas in the combustion hearth, mixing the fuel gas with air, and igniting the combustion head to realize the ignition operation of the fuel. Flame generated by gas combustion penetrates through a combustion hearth and enters the heating inner tube 1 to be continuously combusted, heat generated by combustion is transferred to the heating outer tube 2, and then the heat is transferred to polluted soil to carry out remediation operation of the polluted soil.
After flame generated by fuel enters the heating inner tube 1, the heating inner tube is divided into three areas, namely an upper middle temperature area 3, a middle high temperature area 4 and a lower low temperature area 5 according to temperature distribution on the heating inner tube 1, after the flame enters the bottom of the heating inner tube 1, the flame reflows to the top of the heating outer tube 2 through a gap between the heating inner tube 1 and the heating outer tube 2, heat is transferred into polluted soil through the heating outer tube 2, the heating temperature in the polluted soil is approximately equal, and the soil remediation effect is improved.
When gas tail gas arrives low temperature zone 5 down, in order to guarantee the equilibrium of the temperature of heating outer tube 2 everywhere, need release more energy to pollute in the soil in low temperature zone 5 down, low temperature zone 5 sets up high density spiral 7 that density is high and realizes down, its principle does, high density spiral 7 screw thread is many and the pitch is little, at the in-process of gas tail gas backward flow, the area of contact between gas tail gas and the high density spiral 7 increases, the flow distance of gas tail gas increases, make the heat that carries in the gas tail gas more by high density spiral 7 and heating outer tube 2 bottoms absorption, and then in transmitting more heats to polluting the soil, realize polluting the equilibrium of soil heating temperature.
When the gas tail gas reaches the middle-high temperature area 4, the heating outer pipe 2 is made of carbon steel heat conduction material due to the fact that the temperature of the gas tail gas is high, heat in the gas tail gas can be effectively transferred into the polluted soil, and the heating temperature of the polluted soil at the middle-high temperature area 4 is equal to that of the polluted soil at the lower low temperature area 5.
When the gas tail gas reaches the upper and middle temperature regions 3, the heat transferred from the heating outer tube 2 to the polluted soil needs to be increased because the temperature of the gas tail gas is lower than that of the lower temperature region 5, but because the temperature of the upper and middle temperature regions 3 is higher than that of the lower temperature region 5, the screw threads arranged at the upper and middle temperature regions 3 are fewer than those of the lower temperature region 5, the screw pitch is larger, and meanwhile, because the upper and middle temperature regions 3 are close to the ground, the heat loss is serious, and at the moment, the heat preservation layer 11 is arranged at the top of the heating outer tube 2, so that. In summary, the heating outer tube 2 transfers heat into the contaminated soil in different amounts to heat the contaminated soil so that the heating temperature of the contaminated soil is approximately equivalent. After the soil is heated, VOCs and SVOCs in the soil can gasify, pyrolysis to extract out through gaseous form, the gaseous product that volatilizees carries out relevant purification treatment according to the material that contains, can carry out energy reutilization or discharge to reach standard, realized the good restoration of soil.
(4) Backfilling a well pit: and after the repairing operation of the polluted soil is completed, taking out the heating well structure, and backfilling the well pit by using clean and pollution-free soil, so that the smoothness of the surface of the polluted soil is ensured, and the whole repairing operation of the soil is completed.
Compared with the traditional heating pipe in-situ thermal desorption repair system, the invention has unique advantages. According to the invention, the spiral structure is added to the inner pipe of the heating sleeve according to the different depths of the heating sleeve in the soil layer, the increase of the spiral form disturbs the flow field of high-temperature flue gas in the outer sleeve, increases the retention time and the retention distance of the high-temperature flue gas in the outer sleeve, increases the contact time of the high-temperature flue gas and soil, plays a role in promoting the conduction of the heat of the high-temperature flue gas, effectively improves the energy utilization rate and saves fuel; meanwhile, according to the temperature change of the heating sleeve at different depths, the screw pitch of the screw is correspondingly changed, the temperature fields of the heating sleeve at different depths are basically consistent, and the soil restoration effect is greatly improved.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A heating well structure for an in-situ gas thermal desorption technology comprises a heating inner pipe (1) and a heating outer pipe (2), wherein the central axis of the heating inner pipe (1) is coincided with the central axis of the heating outer pipe (2);
the method is characterized in that: the heating inner pipe (1) is sequentially provided with an upper middle temperature area (3), a middle high temperature area (4) and a lower low temperature area (5) from top to bottom, a low-density spiral (6) is arranged on the outer surface of the upper middle temperature area (3), the outer surface of the middle high temperature area (4) is not treated, a high-density spiral (7) is arranged on the outer surface of the lower low temperature area (5), and a plugging piece (8) is arranged at the bottom end of the heating outer pipe (2).
2. The heater well structure for in-situ gas thermal desorption technology as claimed in claim 1, wherein: the welding of heating inner tube (1) top has first ring flange (9) that are used for sealed isolated inside and outside tail gas, the welding of heating outer tube (2) top has second ring flange (10) that are used for connecting burning furnace.
3. The heater well structure for in-situ gas thermal desorption technology as claimed in claim 1, wherein: and a heat insulation layer (11) is arranged at the top of the heating outer pipe (2).
4. The heater well structure for in-situ gas thermal desorption technology as claimed in claim 1, wherein: the top of the heating outer pipe (2) is provided with a tail gas outlet (12), and the tail gas outlet (12) is used for being connected with a tail gas pipeline.
5. The heater well structure for in-situ gas thermal desorption technology as claimed in claim 1, wherein: the outer ends of the low-density spiral (6) and the high-density spiral (7) are attached to the inner wall of the heating outer tube (2).
6. The heater well structure for in-situ gas thermal desorption technology as claimed in claim 1, wherein: the heating inner pipe (1) is made of stainless steel high-temperature resistant materials.
7. The heater well structure for in-situ gas thermal desorption technology as claimed in claim 1, wherein: the heating outer pipe (2) is made of carbon steel heat conduction materials.
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| CN202011385949.XA CN112642846A (en) | 2020-12-01 | 2020-12-01 | Heating well structure for in-situ gas thermal desorption technology |
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Cited By (2)
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| CN113426820A (en) * | 2021-08-02 | 2021-09-24 | 安徽省通源环境节能股份有限公司 | Direct thermal desorption device of overheated formula steam |
| CN116060428A (en) * | 2023-02-20 | 2023-05-05 | 北京建工环境修复股份有限公司 | In-situ gas thermal desorption system for organic contaminated soil |
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| CN116060428A (en) * | 2023-02-20 | 2023-05-05 | 北京建工环境修复股份有限公司 | In-situ gas thermal desorption system for organic contaminated soil |
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Application publication date: 20210413 |