Strengthened desorption and remediation system for organic contaminated soil

Abstract

The utility model belongs to the technical field of soil remediation, and particularly relates to an organic contaminated soil enhanced desorption remediation system which comprises a remediation workshop, a tail gas treatment unit, a high-temperature air supply device and a high-temperature flue gas supply device used for heating the high-temperature air supply device. A high-temperature air supply pipeline communicated with the high-temperature air supply device is arranged in the repairing workshop, and the high-temperature flue gas supply device and the repairing workshop are both connected with the tail gas treatment unit. According to the utility model, high-temperature flue gas is used for heating air, and the heated air is used for heating volatile organic contaminated soil, so that desorption and decomposition of organic matters are promoted, the organic matters are transferred into the air from the contaminated soil, and finally, contaminated gas and the high-temperature flue gas are discharged into the tail gas treatment unit for treatment; the volatile organic contaminated soil is remedied through cooperation of the high-temperature flue gas and normal-temperature desorption, the remediation efficiency can be improved, the remediation period can be shortened, secondary utilization of the high-temperature flue gas can be achieved, and the remediation cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of soil remediation, and in particular relates to an enhanced desorption and remediation system for organic polluted soil. Background Art

[0002] Organic pollutants in soil are divided into two categories: volatile and semi-volatile. Thermal desorption technology has a good remediation effect on volatile and semi-volatile organic polluted soils, but thermal desorption technology consumes a large amount of natural gas and has a low heat utilization rate. A large amount of heat is carried away by high-temperature flue gas and directly discharged into the atmosphere, resulting in a huge waste of heat. Therefore, for volatile organic polluted soils, room temperature desorption technology is often used for remediation. However, the room temperature desorption remediation speed is slow and often cannot meet the construction period requirements of the polluted site. Utility Model Content

[0003] In order to overcome the deficiencies of the above-mentioned prior art, the purpose of the utility model is to provide an enhanced desorption and remediation system for organic contaminated soil which is economical, efficient, easy to operate, reasonably structured, highly adaptable and can be applied on an engineering scale.

[0004] To achieve the above-mentioned purpose, the technical solution of the utility model is an enhanced desorption remediation system for organic contaminated soil, comprising a remediation workshop, an exhaust gas treatment unit, a high-temperature air supply device and a high-temperature flue gas supply device for heating the high-temperature air supply device; a high-temperature air supply pipeline is provided in the remediation workshop, and the high-temperature air supply pipeline is connected to the high-temperature air supply device; the high-temperature flue gas supply device and the remediation workshop are both connected to the exhaust gas treatment unit.

[0005] Furthermore, the high-temperature flue gas supply device includes a high-temperature flue gas bin, one end of the high-temperature flue gas bin is provided with a high-temperature flue gas inlet, and the other end is provided with a high-temperature flue gas outlet, the high-temperature flue gas inlet is connected to the high-temperature flue gas exhaust chimney of the thermal desorption system through a first vacuum pump, and the high-temperature flue gas outlet is connected to the exhaust gas treatment unit.

[0006] Furthermore, the high-temperature air supply device includes an air heating chamber, which is arranged in the high-temperature smoke chamber; the air heating chamber is provided with an air inlet and an air outlet, the air inlet is connected to the atmosphere through a second vacuum pump, and the air outlet is connected to the high-temperature air supply pipe.

[0007] Furthermore, a first multi-parameter monitor is provided in the high-temperature smoke chamber, and a second multi-parameter monitor is provided in the air heating chamber.

[0008] Furthermore, the high-temperature air supply pipe includes a high-temperature air vertical pipe and a high-temperature air horizontal pipe. The high-temperature air vertical pipe is arranged on the inner side around the repair workshop. The bottom end of the high-temperature air vertical pipe is connected to the high-temperature air supply device, and the top end of the high-temperature air vertical pipe is connected to the high-temperature air horizontal pipe; the lower surface of the high-temperature air horizontal pipe is provided with a high-temperature air nozzle.

[0009] Furthermore, a first sealing door is arranged at the bottom of the repair workshop, a second sealing door is arranged on the outer side of the first sealing door, and a third multi-parameter monitor is arranged in the repair workshop.

[0010] Furthermore, a third multi-parameter monitor is provided in the repair workshop.

[0011] Furthermore, the repair workshop is connected to the exhaust gas treatment unit through a negative pressure extraction device.

[0012] Furthermore, the negative pressure extraction device includes a third vacuum pump, the air inlet of the third vacuum pump is connected to the top of the repair workshop, and the air outlet of the third vacuum pump is connected to the air inlet of the exhaust gas treatment unit.

[0013] Furthermore, the exhaust gas treatment unit includes an exhaust gas treatment device and an exhaust gas exhaust chimney. The high-temperature flue gas outlet of the high-temperature flue gas supply device and the repair workshop are both connected to the air inlet of the exhaust gas treatment device, and the air outlet of the exhaust gas treatment device is connected to the exhaust gas exhaust chimney through a fourth vacuum pump.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The utility model utilizes high-temperature flue gas to heat the air, and passes the heated high-temperature air into a repair workshop to heat the volatile organic polluted soil, promotes the desorption and decomposition of organic matter and transfers it from the polluted soil to the air, and finally discharges the polluted gas and the high-temperature flue gas into the exhaust gas treatment unit for treatment. The volatile organic polluted soil is repaired by the coordinated desorption of high-temperature flue gas and room-temperature desorption, which can not only improve the repair efficiency and shorten the repair period, but also realize the secondary utilization of the high-temperature flue gas and reduce the repair cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1A schematic diagram of the structure of an enhanced desorption and remediation system for organic contaminated soil provided by an embodiment of the utility model;

[0018] In the figure: 1. high-temperature flue gas exhaust chimney; 2. first vacuum pump; 3. first stop valve; 4. second vacuum pump; 5. first flow meter; 6. high-temperature flue gas bin; 7. high-temperature flue gas inlet; 8. first multi-parameter monitor; 9. high-temperature flue gas outlet; 10. air heating bin; 11. air inlet; 12. second multi-parameter monitor; 13. repair workshop; 14. first sealed door; 15. second sealed door; 16. high-temperature air vertical pipe; 17. high-temperature air horizontal pipe; 18. high-temperature air nozzle; 19. third multi-parameter monitor; 20. movable pulley; 21. motor; 22. mixer; 23. third vacuum pump; 24. second flow meter; 25. exhaust gas treatment device; 26. second stop valve; 27. fourth vacuum pump; 28. exhaust chimney. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0021] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0022] like Figure 1As shown, this embodiment provides an enhanced desorption remediation system for organic contaminated soil, including a remediation workshop 13, an exhaust gas treatment unit, a high-temperature air supply device, and a high-temperature flue gas supply device for heating the high-temperature air supply device; a high-temperature air supply pipeline is provided in the remediation workshop 13, and the high-temperature air supply pipeline is connected to the high-temperature air supply device; the high-temperature flue gas supply device and the remediation workshop 13 are both connected to the exhaust gas treatment unit. This embodiment uses high-temperature flue gas to heat the air, and the heated high-temperature air is passed into the remediation workshop 13 to heat the volatile organic contaminated soil, promote the desorption and decomposition of organic matter, and transfer it from the contaminated soil to the air, and finally discharge the polluted gas and high-temperature flue gas into the exhaust gas treatment unit for treatment. The volatile organic contaminated soil is repaired by the coordinated desorption of high-temperature flue gas and room temperature, which can not only improve the remediation efficiency and shorten the remediation period, but also realize the secondary utilization of high-temperature flue gas and reduce the remediation cost.

[0023] To refine the above embodiment, the high-temperature flue gas supply device includes a high-temperature flue gas bin 6, one end of the high-temperature flue gas bin 6 is provided with a high-temperature flue gas inlet 7, and the other end is provided with a high-temperature flue gas outlet 9, the high-temperature flue gas inlet 7 is connected to the high-temperature flue gas exhaust pipe 1 of the thermal desorption system through the first vacuum pump 2, and the high-temperature flue gas outlet 9 is connected to the exhaust gas treatment unit. In this embodiment, the high-temperature flue gas of the thermal desorption system is used as a heat source to heat the air, which can not only recover and reuse the heat in the high-temperature flue gas generated during the thermal desorption process, but also reduce the impact on the environment.

[0024] In this embodiment, the repair workshop 13 is a sealed steel structure greenhouse to ensure that the polluted gas in the repair workshop 13 does not leak out, reducing the impact on the surrounding environment; the high-temperature smoke warehouse 6 is a stainless steel sealed warehouse body, and the repair workshop 13 is arranged above the high-temperature smoke warehouse 6.

[0025] Furthermore, the air inlet of the first vacuum pump 2 is connected to the high-temperature flue gas exhaust chimney 1 through a pipe, and the air outlet of the first vacuum pump 2 is connected to the high-temperature flue gas inlet 7 through a pipe. A first stop valve 3 is connected to the pipe between the first vacuum pump 2 and the high-temperature flue gas inlet 7.

[0026] To refine the above embodiment, the high-temperature air supply device includes an air heating chamber 10, and the air heating chamber 10 is arranged in the high-temperature smoke chamber 6; the air heating chamber 10 is provided with an air inlet 11 and an air outlet, the air inlet 11 is connected to the air outlet of the second vacuum pump 4 through a pipeline, the air inlet of the second vacuum pump 4 is connected to the atmosphere through a pipeline, and the air outlet is connected to the high-temperature air supply pipeline. Among them, the air heating chamber 10 is a stainless steel sealed chamber body. In this embodiment, the high-temperature smoke and the air in the air heating chamber 10 are heat exchanged to increase the temperature of the air entering the repair workshop 13, accelerate the volatilization and decomposition of organic pollutants, and improve the repair effect.

[0027] like Figure 1 As shown, a first multi-parameter monitor 8 is provided in the high-temperature smoke bin 6, and the first multi-parameter monitor 8 is used to monitor the temperature and pressure in the high-temperature smoke bin 6 in real time; a second multi-parameter monitor 12 is provided in the air heating bin 10, and the second multi-parameter monitor 12 is used to monitor the temperature and pressure in the air heating bin 10 in real time.

[0028] In this embodiment, the high-temperature air supply pipeline includes a high-temperature air vertical pipe 16 and a high-temperature air horizontal pipe 17. The high-temperature air vertical pipe 16 is arranged on the inner side of the repair workshop 13. The bottom end of the high-temperature air vertical pipe 16 is connected to the air outlet of the high-temperature air supply device, and the top end of the high-temperature air vertical pipe 16 is connected to the high-temperature air horizontal pipe 17; the lower surface of the high-temperature air horizontal pipe 17 is provided with a high-temperature air nozzle 18. The high-temperature air vertical pipe 16 and the high-temperature air horizontal pipe 17 are both hollow stainless steel pipes. In one embodiment, both ends of the air heating warehouse 10 are connected to the high-temperature air vertical pipe 16, and the two ends of the high-temperature air horizontal pipe 17 are respectively connected to the high-temperature air vertical pipe 16 on both sides. In this embodiment, according to the size of the repair workshop 13, multiple high-temperature air horizontal pipes 17 can be arranged in the repair workshop 13 at intervals, and both ends of each high-temperature air horizontal pipe 17 are connected to the air heating warehouse 10 through the high-temperature air vertical pipe 16.

[0029] Furthermore, a first sealing door 14 is provided at the bottom of the repair workshop 13, and a second sealing door 15 is provided on the outer side of the first sealing door 14, so as to enhance the sealing performance of the repair workshop 13 and prevent the organic pollutant gas from escaping into the air.

[0030] In this embodiment, a third multi-parameter monitor 19 is provided in the repair workshop 13 . The third multi-parameter monitor 19 is provided on the top of the repair workshop 13 and is used for real-time monitoring of the pollutant concentration, pressure and temperature in the repair workshop 13 .

[0031] The above embodiment is optimized, and a stirring and mixing device is provided in the repair workshop 13. Furthermore, the stirring and mixing device includes a mobile pulley 20, a motor 21 and a mixer 22. A top beam is provided on the top of the repair workshop 13, and the mobile pulley 20 is slidably mounted on the top beam. The motor 21 is mounted on the mobile pulley 20 through a bracket, and the output shaft of the motor 21 is connected to the mixer 22. Specifically, the top beam can be made of I-beam, and the two mobile pulleys 20 are respectively slidably mounted on the lower flange plates on both sides of the web of the I-beam, and the rotating shafts of the two mobile pulleys 20 are rotatably connected with the bracket. The mobile pulley 20 moves along the I-beam, thereby driving the motor 21 and the mixer 22 to move along the top beam, stirring the organic contaminated soil in the repair workshop 13, and promoting the continuous transfer of organic pollutants from the soil to the air. In this embodiment, according to the size of the repair workshop 13, multiple stirring and mixing devices can be arranged at intervals in the repair workshop 13.

[0032] The above embodiment is optimized, and the repair workshop 13 is connected to the exhaust gas treatment unit through a negative pressure extraction device. This embodiment ensures that a negative pressure environment is always maintained in the repair workshop 13 during the repair process through a negative pressure extraction device to prevent organic pollutants from diffusing into the outside air. Specifically, the negative pressure extraction device includes a third vacuum pump 23, the air inlet of the third vacuum pump 23 is connected to the top of the repair workshop 13, and the air outlet of the third vacuum pump 23 is connected to the air inlet of the exhaust gas treatment unit. Furthermore, a second flow meter 24 is provided between the air outlet of the third vacuum pump 23 and the air inlet of the exhaust gas treatment unit.

[0033] Furthermore, the exhaust gas treatment unit includes an exhaust gas treatment device 25 and an exhaust gas exhaust chimney 28. The high-temperature flue gas outlet 9 of the high-temperature flue gas supply device and the outlet of the second flowmeter 24 are respectively connected to the air inlet of the exhaust gas treatment device 25 through pipes, and the outlet of the exhaust gas treatment device 25 is connected to the air inlet of the fourth vacuum pump 27 through a pipe, and the outlet of the fourth vacuum pump 27 is connected to the exhaust gas exhaust chimney 28 through a pipe.

[0034] The organic contaminated soil enhanced desorption remediation system of this embodiment is used to remediate volatile organic contaminated soil. The remediation process includes a contaminated soil pretreatment process, a contaminated soil filling process, a remediation parameter setting and regulation process, a high-temperature flue gas and high-temperature air supply process, a stirring and mixing remediation process, a negative pressure extraction process, an exhaust gas treatment process, and a soil acceptance and transportation process after remediation.

[0035] Contaminated soil pretreatment process: the organic contaminated soil to be repaired is excavated, crushed, and sieved to remove impurities such as stones and plastics in the contaminated soil and set aside.

[0036] Contaminated soil filling process: open the second sealed door 15 and the first sealed door 14 respectively, use a forklift to transport the pre-treated organic contaminated soil to the remediation workshop 13, use an excavator to build a pile of contaminated soil, and then close the first sealed door 14 and the second sealed door 15.

[0037] Restoration parameter setting and control process: First, based on the types of organic pollutants in the soil, pollutant concentrations, and restoration target values, determine the process parameters required for the high-temperature flue gas and high-temperature air supply process, negative pressure extraction process, exhaust gas treatment process, stirring and mixing restoration process, and then complete the restoration process according to the following process.

[0038] High-temperature flue gas and high-temperature air supply process: the first vacuum pump 2, the first stop valve 3, the second vacuum pump 4, and the first flow meter 5 are powered on and started respectively, the first vacuum pump 2 extracts the high-temperature flue gas in the high-temperature flue gas exhaust pipe 1, and the high-temperature gas enters the high-temperature flue gas bin 6 for temporary storage through the first stop valve 3 and the high-temperature flue gas inlet 7; the second vacuum pump 4 extracts normal-temperature air from the atmosphere, and the normal-temperature air enters the air heating bin 10 through the first flow meter 5, and the high-temperature flue gas in the high-temperature flue gas bin 6 heats the normal-temperature air in the air heating bin 10 through heat exchange, and the first multi-parameter monitor 8 and the second multi-parameter monitor 12 monitor the temperature and pressure of the high-temperature flue gas bin 6 and the air heating bin 10 respectively.

[0039] High-temperature heating process: The high-temperature air in the air heating chamber 10 enters the high-temperature air vertical pipe 16 and the high-temperature air horizontal pipe 17 in turn, and is sprayed into the surface of the contaminated soil in the repair workshop 13 through the high-temperature air nozzle 18. The high-temperature air heats the contaminated soil in the repair workshop 13, promotes the desorption and decomposition of organic matter, and transfers it from the contaminated soil to the air.

[0040] Desorption remediation process: The mobile pulley 20, the motor 21, and the mixer 22 are powered on and started. The mobile pulley 20 drives the motor 21 and the mixer 22 to continuously move along the top beam of the remediation workshop 13. The motor 21 rotates and drives the mixer 22 to rotate, and the contaminated soil is continuously stirred. Under the reinforcement of high-temperature air, organic pollutants are continuously transferred from the soil to the air.

[0041] Negative pressure extraction process: The third multi-parameter monitor 19, the third vacuum pump 23, and the second flow meter 24 are powered on and started, the third vacuum pump 23 continuously extracts the air in the repair workshop 13, and the second flow meter 24 constantly measures the volume of air extracted by the third vacuum pump 23. The third multi-parameter monitor 19 constantly measures the concentration, pressure, and temperature of pollutants in the repair workshop 13. During the repair process, the repair workshop 13 always maintains a negative pressure environment, effectively preventing organic pollutants from diffusing into the outside air.

[0042] Exhaust gas treatment process: the exhaust gas treatment device 25, the second stop valve 26, and the fourth vacuum pump 27 are powered on and started, the high-temperature flue gas from the high-temperature flue gas bin 6 is discharged into the exhaust gas treatment device 25 through the high-temperature flue gas outlet 9 through the pipeline, and the fourth vacuum pump 27 draws the polluted air from the repair workshop 13 to the exhaust gas treatment device 25. The exhaust gas treatment device 25 treats the exhaust gas to meet the standards through multiple methods such as multi-stage dust removal, high-temperature decomposition, and catalytic oxidation. The fourth vacuum pump 27 discharges the exhaust gas that meets the standards into the exhaust chimney 28 through the second stop valve 26.

[0043] The process of accepting and transporting the soil after restoration is as follows: first, the second sealed door 15 and the first sealed door 14 are opened, and representative soil samples are taken for testing. If the restoration of the contaminated soil meets the standards, the contaminated soil that meets the standards will be transported for use; if the restoration of the contaminated soil does not meet the standards, the first sealed door 14 and the second sealed door 15 are closed, and the above restoration process is repeated until the contaminated soil is restored to meet the standards.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An enhanced desorption and remediation system for organic contaminated soil, characterized by: It includes a repair workshop, an exhaust gas treatment unit, a high-temperature air supply device and a high-temperature flue gas supply device for heating the high-temperature air supply device; a high-temperature air supply pipeline is provided in the repair workshop, and the high-temperature air supply pipeline is connected with the high-temperature air supply device; the high-temperature flue gas supply device and the repair workshop are both connected with the exhaust gas treatment unit.

2. The organic contaminated soil enhanced desorption and remediation system according to claim 1, characterized in that: The high-temperature flue gas supply device includes a high-temperature flue gas bin, one end of which is provided with a high-temperature flue gas inlet, and the other end of which is provided with a high-temperature flue gas outlet. The high-temperature flue gas inlet is connected to the high-temperature flue gas exhaust chimney of the thermal desorption system through a first vacuum pump, and the high-temperature flue gas outlet is connected to the exhaust gas treatment unit.

3. The organic contaminated soil enhanced desorption and remediation system according to claim 2, characterized in that: The high-temperature air supply device includes an air heating chamber, which is arranged in the high-temperature smoke chamber; the air heating chamber is provided with an air inlet and an air outlet, the air inlet is connected to the atmosphere through a second vacuum pump, and the air outlet is connected to the high-temperature air supply pipeline.

4. The enhanced desorption and remediation system for organic contaminated soil according to claim 3, characterized in that: A first multi-parameter monitor is arranged in the high-temperature smoke chamber, and a second multi-parameter monitor is arranged in the air heating chamber.

5. The organic contaminated soil enhanced desorption and remediation system according to claim 1, characterized in that: The high-temperature air supply pipeline includes a high-temperature air vertical pipe and a high-temperature air horizontal pipe. The high-temperature air vertical pipe is arranged on the inner side around the repair workshop. The bottom end of the high-temperature air vertical pipe is connected to the high-temperature air supply device, and the top end of the high-temperature air vertical pipe is connected to the high-temperature air horizontal pipe; the lower surface of the high-temperature air horizontal pipe is provided with a high-temperature air nozzle.

6. The organic contaminated soil enhanced desorption and remediation system according to claim 1, characterized in that: A first sealing door is arranged at the bottom of the repair workshop, and a second sealing door is arranged on the outer side of the first sealing door.

7. The organic contaminated soil enhanced desorption and remediation system according to claim 1, characterized in that: A third multi-parameter monitor is arranged in the repair workshop.

8. The enhanced desorption and remediation system for organic contaminated soil according to claim 1, characterized in that: The repair workshop is connected to the tail gas treatment unit through a negative pressure extraction device.

9. The enhanced desorption and remediation system for organic contaminated soil according to claim 8, characterized in that: The negative pressure extraction device comprises a third vacuum pump, the air inlet of the third vacuum pump is connected to the top of the repair workshop, and the air outlet of the third vacuum pump is connected to the air inlet of the exhaust gas treatment unit.

10. The organic contaminated soil enhanced desorption and remediation system according to claim 1, characterized in that: The exhaust gas treatment unit includes an exhaust gas treatment device and an exhaust gas exhaust chimney. The high-temperature flue gas outlet of the high-temperature flue gas supply device and the repair workshop are both connected to the air inlet of the exhaust gas treatment device. The air outlet of the exhaust gas treatment device is connected to the exhaust gas exhaust chimney through a fourth vacuum pump.

Images