CN216386851U - Indirect thermal desorption test system for contaminated soil - Google Patents
Indirect thermal desorption test system for contaminated soil Download PDFInfo
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- CN216386851U CN216386851U CN202122801419.5U CN202122801419U CN216386851U CN 216386851 U CN216386851 U CN 216386851U CN 202122801419 U CN202122801419 U CN 202122801419U CN 216386851 U CN216386851 U CN 216386851U
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Abstract
The utility model belongs to the technical field of contaminated soil remediation, and particularly relates to a contaminated soil indirect thermal desorption test system which comprises a muffle furnace, an air blower, a tail gas treatment device and a soil container box for containing contaminated soil to be tested; the soil container box is arranged in the muffle furnace and is sealed by a locking cover; the two opposite sides of the soil container box are respectively provided with an air inlet pipeline and an air outlet pipeline; one end of the air inlet pipeline extends into the soil container box, and the other end of the air inlet pipeline extends out of the muffle furnace and is communicated with an air outlet of the blower; one end of the air outlet pipeline extends into the soil container box, and the other end of the air outlet pipeline extends out of the muffle furnace and is communicated with the tail gas treatment device. The indirect thermal desorption test system for the polluted soil provided by the utility model adopts the muffle furnace to simulate the desorption indirect thermal desorption atmosphere, the test process is more real and credible by blowing air of the air blower, and the matched desorption tail gas treatment device meets the environmental protection requirement and is matched with a temperature control and automatic recording system, so that the system has wider applicability and can obtain the test parameters more accurately.
Description
Technical Field
The utility model belongs to the technical field of contaminated soil remediation, and particularly relates to a contaminated soil indirect thermal desorption test system.
Background
With the development of industrialization and urbanization in China, the pollution of soil environment caused by human activities is more serious. At present, the exceeding standard rate of soil pollution in China reaches 16.1%, which is particularly shown in various aspects of industrial and mining industry, agriculture and the like, and is mainly focused on the periphery of the mining industry with higher modern economic development level and rapid development of the modern industry, and parts of cities and suburbs. For organic matter contaminated soil, common remediation technologies include thermal desorption technology, chemical oxidation technology, microbial technology, and the like.
The ex-situ thermal desorption technology has the advantages of high pollutant removal efficiency, short remediation period, wide pollutant adaptation range and the like for remediation of the organic polluted soil field. The ex-situ thermal desorption technology mainly comprises two parts: firstly, thermal desorption treatment is carried out on soil, and pollutants in the soil are removed through heating; and secondly, the desorption tail gas is treated to remove pollutants in the thermal desorption tail gas, and the pollutants are discharged after reaching standards. In recent thirty years, continuous research on the basic theory and technology of thermal desorption is carried out in Europe, America, China and the like, and certain achievements are achieved in the aspects of basic theory and technology application. The ex-situ thermal desorption technology is developed from the treatment of organic pollutants with single components, low boiling points (less than 300 ℃) and no chlorine to the treatment of organic pollutants with high boiling points (more than 300 ℃), and finally to the treatment of organic pollutants with complex components, high boiling points and chlorine at present.
At present, the ex-situ thermal desorption technology is divided into direct thermal desorption technology and indirect thermal desorption technology, is developed into the most effective and most thorough technology for treating organic matter polluted soil and volatile inorganic matter polluted soil, and is widely applied to various fields with serious pollution and complex pollution components. The indirect thermal desorption technology is an effective technology for restoring organic contaminated soil, and can be generally divided into high-temperature thermal desorption (desorption temperature 450-550 ℃), medium-temperature thermal desorption (desorption temperature 300-450 ℃) and low-temperature thermal desorption (desorption temperature <300 ℃) according to different organic types. The indirect thermal desorption technology is a general technology, namely the desorption temperature and the flue gas volume can be adjusted according to the soil pollutant type.
The indirect thermal desorption technology is more applied due to strong adaptability, environmental protection and the like, however, the difference of pollutant components and depth, soil texture, hydrogeological conditions and the like of each polluted site is a decisive factor of main process parameters of the indirect thermal desorption technology, namely desorption temperature and soil retention time, and also a decisive factor for ensuring efficient green restoration, and is reflected in the following aspects: firstly, the boiling points of various pollutants in soil determine the lowest desorption temperature; secondly, the concentration of various pollutants in the soil, the soil texture and the hydrogeological conditions determine the retention time of the polluted soil; thirdly, the optimal process parameters can realize green and efficient repair.
The types of pollutants, the soil texture and the like in the polluted soil to be treated are different, so that the indirect thermal desorption parameters of each polluted site need to be acquired through a small test or a pilot plant, and the consumed time is long. According to different polluted soil textures and pollutant types treated by the indirect thermal desorption technology, desorption parameter temperature and retention time in the engineering implementation process are obtained by a test system, so that the method is the most rapid and effective method, and the test is used for simulating the actual engineering implementation atmosphere as much as possible, so that the obtained parameters are more accurate and reliable.
Disclosure of Invention
In order to overcome the defects in the prior art, the utility model aims to provide an indirect thermal desorption test system for contaminated soil, which is used for testing before an indirect thermal desorption technology is used, so as to obtain process parameters of contaminated soil in different contaminated sites by adopting the indirect thermal desorption technology.
In order to achieve the purpose, the technical scheme of the utility model is that the indirect thermal desorption test system for the contaminated soil comprises a muffle furnace, a blower, a tail gas treatment device and a soil container box for containing the contaminated soil to be tested; the soil container box is arranged in the muffle furnace and is sealed by a locking port cover; an air inlet pipeline and an air outlet pipeline are respectively arranged on two opposite sides of the soil container box; one end of the air inlet pipeline extends into the soil container box, and the other end of the air inlet pipeline extends out of the muffle furnace and is communicated with an air outlet of the blower; one end of the air outlet pipeline extends into the soil container box, and the other end of the air outlet pipeline extends out of the muffle furnace and is communicated with an air inlet of the tail gas treatment device.
Further, the system also comprises a soil thermometer, a display of the soil thermometer is arranged outside the muffle furnace, and a detection rod of the soil thermometer extends into the to-be-tested polluted soil in the soil container box.
Furthermore, the soil thermometers are provided in a plurality, and the detection rod of each soil thermometer extends to different depths in the soil to be tested and polluted.
Further, the tail gas treatment device comprises a tail gas buffer and a condenser, the gas outlet pipeline is communicated with a gas inlet of the tail gas buffer, and a gas outlet of the tail gas buffer is communicated with a gas inlet of the condenser.
Furthermore, the tail gas treatment device also comprises a cooling water inlet pipe and a cooling water device filled with ice blocks, wherein the cooling water inlet pipe passes through the cooling water device and is communicated with a cooling water inlet of the condenser.
Furthermore, the volume of the tail gas buffer is not less than 2L, and the volume of the cooling water device is not less than 5L.
Furthermore, the flue gas channel in the condenser adopts a spiral structure, and the effective number of the spiral is not less than 5.
Further, an air inlet of the air blower is provided with a gas flowmeter.
Further, the air volume of the blower is not less than 5L/min.
Furthermore, a temperature controller is arranged on the muffle furnace.
Compared with the prior art, the utility model has the following beneficial effects:
(1) the indirect thermal desorption test system for the polluted soil provided by the utility model adopts the muffle furnace to simulate the desorption indirect thermal desorption atmosphere, the test process is more real and credible by blowing air through the air blower, and the matched desorption tail gas treatment device meets the environmental protection requirement and is matched with a temperature control and automatic recording system, so that the system has wider applicability and can obtain the test parameters more accurately;
(2) the indirect thermal desorption test system for the polluted soil, provided by the utility model, has the advantages of simple structure, wide application, short test process time consumption, economy and feasibility, can be suitable for acquiring process parameters when the test mode is adopted to carry out indirect thermal desorption repair on the polluted soil of various soil qualities and various pollutants, provides good support for the engineering implementation of the indirect thermal desorption, and has good environmental protection benefits, social benefits and economic benefits.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a contaminated soil indirect thermal desorption test system provided in an embodiment of the present invention;
in the figure: 1. a muffle furnace; 2. a gas flow meter; 3. a blower; 4. a soil thermometer; 5. a temperature controller; 6. a tail gas buffer; 7. a condenser; 8. a cooling water device; 9. a soil container box; 10. the soil was tested for contamination.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in fig. 1, the present embodiment provides a contaminated soil indirect thermal desorption testing system, which includes a muffle furnace 1, a blower 3, a tail gas treatment device, and a soil container box 9 for containing contaminated soil 10 to be tested; the soil container box 9 is arranged in the muffle furnace 1 and sealed by a locking cover; an air inlet pipeline and an air outlet pipeline are respectively arranged on two opposite sides of the soil container box 9; one end of the air inlet pipeline extends into the soil container box 9, and the other end of the air inlet pipeline extends out of the muffle furnace 1 and is communicated with an air outlet of the air blower 3; one end of the air outlet pipeline extends into the soil container box 9, and the other end of the air outlet pipeline extends out of the muffle furnace 1 and is communicated with an air inlet of the tail gas treatment device. In the embodiment, the tested contaminated soil 10 is uniformly and flatly paved in the soil container box 9, and the soil container box 9 is sealed by a locking cover and then is placed in the muffle furnace 1; the air blower 3 blows air into the soil container box 9 from the outside of the muffle furnace 1 through an air inlet pipeline, and then the air outlet pipeline connected to the outside of the muffle furnace 1 is connected with a tail gas treatment system, so that the indirect thermal desorption atmosphere is simulated, the pollutants are simultaneously ensured to be timely discharged out of the soil container box 9 after being desorbed from the soil, the vapor pressure of the pollutants is kept at the lowest level, and the simulated real situation is the real situation of engineering implementation, so that the retention time is more accurately obtained; along with the heating up of muffle furnace 1 in the testing process, the contaminated soil 10 for testing indirectly contacts with hot flue gas in muffle furnace 1, so as to achieve the effect of simulating the indirect thermal desorption process. In the embodiment, a set of test system simulating indirect thermal desorption is designed by utilizing the characteristics of different soil characteristics in the polluted site, so as to carry out test activities and obtain main process parameters in a formal production stage; the test system can simulate the production process of indirect thermal desorption as truly as possible, is safe and environment-friendly, and obtains the most effective technological parameters under the condition of lowest energy consumption through minimum investment so as to guide the formal production of indirect thermal desorption.
Further, the system also comprises a soil thermometer 4, a display of the soil thermometer 4 is arranged outside the muffle furnace 1, and a detection rod of the soil thermometer 4 extends into the tested contaminated soil 10 in the soil container box 9. Further, there are several soil thermometers 4, and the detection rod of each soil thermometer 4 extends to different depths in the contaminated soil 10 to be tested. In this embodiment, the temperature of the contaminated soil 10 to be tested in the indirect thermal desorption test process is obtained by the soil thermometer 4, and the measurement range is not lower than the highest test temperature, and usually, the measurement range is not lower than 600 ℃.
Further, the tail gas treatment device comprises a tail gas buffer 6 and a condenser 7, the gas outlet pipeline is communicated with a gas inlet of the tail gas buffer 6, and a gas outlet of the tail gas buffer 6 is communicated with a gas inlet of the condenser 7. This embodiment realizes that the test process does not have the secondary pollutant emission through designing tail gas buffer 6, condenser 7, guarantees experimental safety and environmental protection. Because indirect thermal desorption is experimental usually to difficult volatile organic compounds contaminated soil, contain difficult volatile organic compounds in the flue gas that the desorption came out, and difficult volatile organic compounds is the gaseous state under the high temperature condition, is solid-state under the low temperature condition, consequently, connect the waste gas that air-blower 3 bloated among the thermal desorption test process in the embodiment to pass through tail gas buffer 6 buffering mixing back, later get into the flue gas passageway in the condenser 7, reduce the temperature of flue gas through condenser 7, make the organic compounds condensation of desorption get rid of.
Furthermore, the tail gas treatment device also comprises a cooling water inlet pipe and a cooling water device 8 filled with ice blocks, wherein the cooling water inlet pipe passes through the cooling water device 8 and is communicated with a cooling water inlet of the condenser 7. The cooling water inlet pipe of the embodiment passes through the cooling water device 8 filled with ice blocks, so that the water entering the condenser 7 is always kept at low temperature to ensure the working effect of the condenser 7; the cooling water of the condenser 7 adopts a lower inlet and an upper outlet.
Furthermore, the volume of the tail gas buffer 6 is not less than 2L, so as to ensure that the desorption tail gas can be fully homogenized; the volume of the cooling water device 8 is not less than 5L, so that the manual replacement frequency is reduced; the cooling water device 8 can be provided with heat preservation measures, so that the cooling efficiency is improved.
Furthermore, the flue gas channel in the condenser 7 adopts a spiral structure, and the effective number of the spiral is not less than 5. As shown in figure 1, desorption flue gas enters the flue gas channel through the air inlet on the condenser 7, and adopts a mode of entering from bottom to top, the flue gas channel adopts a spiral structure, the contact time of the flue gas with cooling water in the condenser 7 is increased, and the effective number of the spiral is not less than 5 so as to ensure the condensation effect.
Further, the air inlet of the blower 3 is provided with a gas flowmeter 2, the air flow of the blower 3 is measured through the gas flowmeter 2, and the air flow is controlled through a valve after being fed back and is used for guiding the adjustment of the air flow of the blower under different test parameters. Further, the air volume of the blower 3 is not less than 5L/min, so that the ventilation requirement in the indirect thermal desorption test process is met.
Further, a temperature controller 5 is arranged on the muffle furnace 1. In the embodiment, the temperature controller 5 is used for realizing the temperature rise and temperature control of the muffle furnace 1 in the indirect thermal desorption test process, and the temperature controller 5 can be interlocked with the soil thermometer 4 to control the test temperature; the temperature controller 5 is controlled by program control, and can automatically record a temperature rise curve, and the curve can be derived. This embodiment makes the control in the testing process more accurate through designing temperature controller 5 and a plurality of soil thermometer 4, also makes data acquisition more high-efficient.
In the embodiment, according to the nature of the soil to be tested and pollutants in the soil, the muffle furnace 1 is designed to be a main heating container, the size of a furnace chamber of the muffle furnace 1 can meet the requirements that the soil to be tested is piled with enough thickness and the upper part of the soil to be tested is provided with enough space after the soil to be tested is put in, the height of the furnace chamber is not less than 150mm, the soil to be tested is put in the muffle furnace 1 through a tray in advance and is heated in the muffle furnace 1, the experiment is taken out after the experiment is finished, the experiment process simulates indirect thermal desorption operation, and the flue gas in the furnace is uninterruptedly replaced by the blower 3; the power of the muffle furnace 1 is not less than 8kW so as to ensure that the highest temperature in the furnace can be maintained at 1000 ℃, and the temperature can be adjusted between 0 and 1000 ℃, thereby meeting the experimental requirements; the general test temperature is around the boiling point of the pollutant in the tested polluted soil 10 as a central value, and is cooled down and heated up to set a gradient test temperature parameter, wherein the grade is usually designed to be 5-6; if the tested contaminated soil 10 contains a plurality of pollutants, the central value is the highest value of all boiling points, so that the reasonability of selecting the indirect thermal desorption temperature in the engineering implementation stage is ensured.
Based on the extremely strong suitability of indirect thermal desorption technique, to the equal diverse characteristics of the soil desorption parameter in every pollution place and every pollutant pollution, the indirect thermal desorption test system of contaminated soil of this embodiment is when can be suitable for the multiple type contaminated soil experiment, adopt muffle furnace 1 simulation desorption indirect thermal desorption atmosphere, make the process of the test truer and more credible through 3 blast blasts of air-blower, supporting desorption tail gas processing apparatus makes the process of the test more environmental protection, supporting temperature control and automatic recording system, so that make the system suitability wider and acquire the experiment parameter more accurately.
The indirect thermal desorption test system for contaminated soil of the embodiment can be suitable for tests of direct thermal desorption technology, in-situ thermal desorption technology and the like after being properly modified.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a pollute indirect thermal desorption test system of soil which characterized in that: comprises a muffle furnace, a blower, a tail gas treatment device and a soil container box for containing the tested contaminated soil; the soil container box is arranged in the muffle furnace and is sealed by a locking port cover; an air inlet pipeline and an air outlet pipeline are respectively arranged on two opposite sides of the soil container box; one end of the air inlet pipeline extends into the soil container box, and the other end of the air inlet pipeline extends out of the muffle furnace and is communicated with an air outlet of the blower; one end of the air outlet pipeline extends into the soil container box, and the other end of the air outlet pipeline extends out of the muffle furnace and is communicated with an air inlet of the tail gas treatment device.
2. The indirect thermal desorption test system for contaminated soil as claimed in claim 1, wherein: the system further comprises a soil thermometer, a display of the soil thermometer is arranged outside the muffle furnace, and a detection rod of the soil thermometer extends into the to-be-tested polluted soil in the soil container box.
3. The indirect thermal desorption test system for contaminated soil as claimed in claim 2, wherein: the soil thermometer has a plurality of, and each soil thermometer's check rod extends to the different degree of depth department in the contaminated soil of confession examination.
4. The indirect thermal desorption test system for contaminated soil as claimed in claim 1, wherein: the tail gas treatment device comprises a tail gas buffer and a condenser, the gas outlet pipeline is communicated with a gas inlet of the tail gas buffer, and a gas outlet of the tail gas buffer is communicated with a gas inlet of the condenser.
5. The indirect thermal desorption test system for contaminated soil as claimed in claim 4, wherein: the tail gas treatment device also comprises a cooling water inlet pipe and a cooling water device filled with ice blocks, wherein the cooling water inlet pipe passes through the cooling water device and is communicated with a cooling water inlet of the condenser.
6. The indirect thermal desorption test system for contaminated soil as claimed in claim 5, wherein: the volume of the tail gas buffer is not less than 2L, and the volume of the cooling water device is not less than 5L.
7. The indirect thermal desorption test system for contaminated soil as claimed in claim 4, wherein: the flue gas channel in the condenser adopts a spiral structure, and the spiral effective number is not less than 5.
8. The indirect thermal desorption test system for contaminated soil as claimed in claim 1, wherein: and a gas flowmeter is arranged at the air inlet of the blower.
9. The indirect thermal desorption test system for contaminated soil as claimed in claim 1, wherein: the air volume of the blower is not less than 5L/min.
10. The indirect thermal desorption test system for contaminated soil as claimed in claim 1, wherein: and a temperature controller is arranged on the muffle furnace.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122801419.5U CN216386851U (en) | 2021-11-16 | 2021-11-16 | Indirect thermal desorption test system for contaminated soil |
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| CN202122801419.5U CN216386851U (en) | 2021-11-16 | 2021-11-16 | Indirect thermal desorption test system for contaminated soil |
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| CN216386851U true CN216386851U (en) | 2022-04-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114993073A (en) * | 2022-05-30 | 2022-09-02 | 江苏省环境科学研究院 | Organic contaminated soil thermal desorption tail gas cooling device |
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2021
- 2021-11-16 CN CN202122801419.5U patent/CN216386851U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114993073A (en) * | 2022-05-30 | 2022-09-02 | 江苏省环境科学研究院 | Organic contaminated soil thermal desorption tail gas cooling device |
| CN114993073B (en) * | 2022-05-30 | 2023-08-18 | 江苏省环境科学研究院 | Organic contaminated soil thermal desorption tail gas cooling device |
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