Enhanced aeration repair device and method based on steam temperature and humidity real-time regulation and control

Abstract

The invention discloses an enhanced aeration repair device based on steam temperature and humidity real-time regulation and control. The enhanced aeration repair device comprises an aeration pipe, gas supply equipment, a steam generator, a mixing box, an extraction mechanism, a collection mechanism and an information processing mechanism. Wherein the aeration pipe is used for penetrating into a volatile organic compound polluted area of a soil body, and aeration holes are formed in the surface of the aeration pipe; the gas supply equipment is used for generating compressed gas with preset pressure; the steam generator is used for generating superheated steam; the input end of the mixing box is connected with the gas supply equipment and the steam generator, the output end is connected with the aerator pipe, and an auxiliary mechanism is arranged in the mixing box and used for evenly mixing compressed gas and steam and keeping the temperature of the mixed gas. The mixing box is additionally arranged on the gas transmission path of the aeration pipe, the steam is input into the mixing box, and the ozone and the compressed gas are fully mixed by using the auxiliary mechanism, so that the volatility is improved at low temperature on the basis of the traditional aeration technology, and the removal efficiency of volatile organic pollutants with various properties is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of groundwater and soil organic pollutant remediation, and particularly relates to an enhanced aeration remediation device and technology for real-time regulation of steam temperature and humidity of contaminated soil. BACKGROUND

[0002] Organic pollutants seriously pollute soil and groundwater, and are the main source of soil and groundwater pollution at present.

[0003] Aeration is one of the most effective methods for remediation of volatile organic compound (VOCs) contaminated groundwater due to its simple operation, high efficiency and environmental friendliness, and has become one of the most effective methods for treating VOCs in soil.

[0004] Aeration remediation is to inject compressed air into saturated contaminated soil through a vertical or horizontal well, and through mass transfer between gas-liquid-solid phases, pollutants are volatilized from the soil or groundwater into the air, and the air containing pollutants continuously rises under the action of buoyancy to reach the unsaturated soil region above the groundwater level, and then under the auxiliary action of soil gas extraction technology, the air containing pollutants is extracted from the ground and treated on the ground, so as to achieve the remediation purpose.

[0005] However, due to the complexity and low volatility of the nature of the pollutants in the soil, the aeration remediation effect is often poor, and the problems of different organic pollutants in the soil are increasingly serious. The aeration device on the market can only achieve the aeration remediation effect of part of the volatile organic pollutants in the soil to a certain extent, and cannot solve the problem of poor remediation effect of various organic pollutants in the aeration process.

[0006] When a conventional aeration remediation site is used, a too high aeration pressure is often used to carry out the pollutants, and a higher aeration pressure requires more energy consumption. Moreover, the high aeration pressure device can only achieve the aeration remediation effect of the organic matter in the soil to a certain extent, and cannot solve the problem of excessive energy consumption, resulting in waste of energy. SUMMARY

[0007] To solve the technical problems proposed in the background art, the present application provides an enhanced aeration remediation device and technology for real-time regulation of steam temperature and humidity.

[0008] The present application adopts the following technical solutions: an enhanced aeration remediation device based on real-time regulation of steam temperature and humidity, comprising: an aeration pipe for penetrating into a contaminated area of the soil, the surface of which is provided with aeration holes; a gas supply device for generating compressed gas with a predetermined pressure; a steam generator for generating superheated steam; The mixed box is connected with the air supply device and the steam generator at the input end and connected with the aeration pipe at the output end, and an auxiliary mechanism is arranged in the mixed box for uniformly mixing compressed gas and steam and keeping the temperature of the mixed gas. The extraction mechanism is arranged in the pollution area for extracting the volatile organic compounds. The collection mechanism is used for recording the removal efficiency and content of the organic pollutants in real time. The information processing mechanism is connected with the collection mechanism and is used for reversely controlling the steam generator, the mixed box and the air supply device based on the removal efficiency data until the removal index is reached.

[0009] As a further improvement of the above scheme, the free end of the aeration pipe is provided with a drill-in head, and the input end of the drill-in head is connected with at least two detachable gas conveying pipe sections; the adjacent gas conveying pipe sections and the gas conveying pipe section and the aeration pipe are fixed by thread rotation.

[0010] As a further improvement of the above scheme, the air supply device comprises an air compressor, and the output end of the air compressor is connected with the mixed box through a first gas outlet pipe; a pressure regulating valve, a flow meter, a switch and a heat tracing belt are sequentially arranged on the first gas outlet pipe along the gas transmission direction.

[0011] As a further improvement of the above scheme, the output end of the steam generator is connected with the mixed box through a second gas outlet pipe, and the second gas outlet pipe is provided with a heat tracing belt.

[0012] As a further improvement of the above scheme, the extraction mechanism comprises a pressure relief pipe, a plurality of pressure relief holes are uniformly arranged in the pressure relief pipe in the axial direction, and the output end of the pressure relief pipe is connected with a gas collection box provided with a negative pressure pump.

[0013] As a further improvement of the above scheme, the collection mechanism comprises an electronic flow meter and a gas detector for monitoring the extraction flow and content of the pollutants in real time.

[0014] As a further improvement of the above scheme, the auxiliary mechanism in the mixed box is an electric resistance wire for stabilizing the temperature in the box in a target range.

[0015] As a further improvement of the above scheme, a cylindrical body provided with a first cavity is arranged in the mixed box, and the outer side of the cylindrical body is communicated with a porous spray pipe; a first gas injection pipe and a second gas injection pipe communicated with the air supply device and the steam generator respectively are arranged on the top of the mixed box.

[0016] As a further improvement of the above scheme, the information processing mechanism is connected with the steam generator, the heat tracing belt, the air compressor and the mixed box through wires to realize parameter closed-loop control.

[0017] The application further provides an enhanced aeration repair method based on real-time steam temperature and humidity control, and the repair device is used, and the method comprises the following steps: Step 1, the aeration pipe is penetrated into the pollution area; Step 2, synchronously input compressed gas and superheated steam into the mixing box, and then transport the mixture to the aeration pipe; Step 3, extract volatile organic compounds through the extraction mechanism; Step 4, monitor the pollutant removal efficiency in real time; Step 5, adjust the steam temperature, gas pressure and mixing temperature based on the removal efficiency data until the standard is met.

[0018] Compared with the prior art, the beneficial effects of the present application are: 1. Significantly improve the removal rate of complex pollutants The present application realizes the uniform mixing of superheated steam and compressed gas into the pollution area through the synergistic temperature control of the resistance wire in the steam generator and the mixing box, so that the steam pressure of low-volatile organic compounds is increased by 3-5 times, and the overall removal rate of pollutants is effectively improved compared with the traditional aeration.

[0019] 2. Realize precise optimization of energy consumption Based on the analysis of real-time data of electronic flow meters and gas detectors by the information processing mechanism, the air compressor pressure, steam generator temperature and heat tracing band power are dynamically adjusted in reverse, so as to avoid energy waste caused by excessive aeration, and the comprehensive energy consumption is reduced.

[0020] 3. Build a full-process automated repair Through the closed-loop control of "pollutant removal efficiency monitoring→information processing mechanism→execution equipment control", the present application eliminates the delay of manual intervention, effectively shortens the repair cycle compared with the traditional technology, and reduces the disturbance rate of soil structure. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The overall structure diagram of the enhanced aeration repair device with real-time steam temperature and humidity control proposed by the present application is shown in the figure. Figure 2 The structure diagram of the drill head and the aeration pipe is shown in the figure. Figure 1 Figure 3 The structure diagram of the mixing box is shown in the figure. Figure 1 Figure 4 The internal structure diagram of the mixing box is shown in the figure. Figure 3 Explanation of main symbols: ​​​1, air compressor; 2, pressure regulating valve; 3, flow machine; 4, switch; 5, heat tracing band; 6, mixing box; 7, first air outlet pipe; 8, steam generator; 9, electronic flowmeter; 10, gas collection tank; 11, gas detector; 12, pressure relief pipe; 13, pressure relief hole; 14, gas delivery pipe section; 15, aeration pipe; 16, drill head; 17, aeration hole; 18, soil; 19, nozzle; 20, first gas injection pipe; 21, resistance wire; 22, third air outlet pipe; 23, second gas injection pipe; 24, second air outlet pipe; 25, first connecting pipe; 26, second connecting pipe; 27, wire. DETAILED DESCRIPTION

[0022] In the following, the application will be further described in conjunction with the drawings and specific embodiments, it should be noted that the following described embodiments or technical features can be combined to form new embodiments without conflict.

[0023] Embodiment 1 Please combine Figures 1 to 4 The enhanced aeration remediation device for real-time temperature and humidity control of contaminated soil steam provided in the present solution includes an aeration pipe, a mixing box, a gas supply device, a steam generator, an extraction mechanism, a collection mechanism, and an information processing mechanism. The aeration pipe is used to penetrate into the contaminated area of the soil body with volatile organic compounds. The gas supply device, the mixing box, and the aeration pipe are connected in sequence according to the direction of gas delivery. The gas supply device can generate compressed gas with a predetermined pressure. The steam generator is used to generate steam that can enhance the volatilization of volatile organic compounds and deliver it to the mixing box. The mixing box has an auxiliary mechanism that can mix and heat the compressed gas and the steam. The extraction mechanism is used to extract and collect volatile organic compounds that are volatilized under the action of steam and aeration from the contaminated area of the soil body. The collection mechanism is used to record the removal efficiency of organic pollutants. The information processing mechanism is used to process and judge the recorded removal efficiency, and reversely control the steam generator, the mixing box, the gas supply device, and the heat tracing band to repeat the above operation until the removal index is reached.

[0024] In the present solution, a drill head 16 is installed on the free end of the aeration pipe 15, and a plurality of aeration holes 17 are distributed on the aeration pipe 15. The drill head 16 and the aeration pipe 15 are of an integral structure, and the drill head 16 is in the form of a threaded drill bit.

[0025] At least two detachable gas delivery pipe sections 14 are arranged on the input end of the aeration pipe 15. The gas delivery pipe sections 14 are pressure-resistant stainless steel pipes. The input end of the gas delivery pipe section 14 away from the aeration pipe 15 is connected to the third air outlet pipe 22, and the input end of the third air outlet pipe 22 is connected to the mixing box 6.

[0026] In the present scheme, two adjacent gas pipe sections 14 are fixed by screwing, and the output end of the gas pipe section 14 and the input end of the aeration pipe 15 are also fixed by screwing. That is, the gas pipe sections 14 can be connected together by internal and external threads, so that in actual work, the number of gas pipe sections 14 can be increased or decreased according to the depth of the soil to be repaired.

[0027] In the present scheme, the upper end of the mixing box 6 is provided with a second gas injection pipe 23 for input of compressed gas and a first gas injection pipe 20 for input of steam.

[0028] In detail, the gas supply equipment in the present scheme includes an air compressor, and the output end of the air compressor is connected to the second gas injection pipe 23 at the bottom of the mixing box 6 through a first gas outlet pipe 7.

[0029] And the first gas outlet pipe 7 is respectively provided with a flow meter 3, a pressure regulating valve 2, a switch 4, and a heat tracing tape 5 in the direction of gas transmission. The electrical components are connected to a power supply and controlled by a controller.

[0030] In detail, the extraction mechanism includes a pressure relief pipe 12 that can be inserted into the vicinity of the contaminated area of the soil, and the output end of the pressure relief pipe 12 is connected to a gas collection box 10, which can provide negative pressure to the pressure relief pipe 12, specifically by installing a negative pressure pump in the gas collection box. In the present scheme, a plurality of pressure relief holes 13 are uniformly arranged on the outer wall of the pressure relief pipe 12 in the axial direction, which are in communication with the inside of the pipe body. And the depth of the pressure relief pipe 12 is the same as the depth of the entire contaminated area, and the depth is the same as that of the gas pipe section 14, and the gas collection box 10 is connected to the pressure relief pipe 12 through a corresponding pipeline.

[0031] In detail, the output end of the steam generator 8 is connected to the first gas injection pipe 20 at the top of the mixing box 6 through a second gas outlet pipe 24, and the second gas outlet pipe 24 is provided with a heat tracing tape 5. After the steam is generated by the steam generator 8, it enters the mixing box 6 through the second gas outlet pipe 24 and the heat tracing tape 5 to participate in the mixing of the compressed gas.

[0032] A first connecting pipe 25 is installed on the mixing box 6, the input end of the first connecting pipe 25 is connected to the jet pipe 19, and the output end of the first connecting pipe 25 is connected to the input end of the second gas injection pipe 23. The input end of a second connecting pipe 26 is connected to the mixing box 6, and the output end of the second connecting pipe 26 is connected to the input end of the first gas injection pipe 20. After the compressed gas and steam are mixed, they can be transported to the aeration pipe 15 through a third gas outlet pipe 22.

[0033] In this scheme, the mixing box 6 is provided with a resistance wire 21 connected with a wire for heating control of the temperature inside the mixing box 6 through the resistance wire 21, so that the mixed compressed gas and steam at the rated temperature are finally sent to the aeration pipe 15 through the third gas outlet pipe 22. The outside of the resistance wire 21 is a metal box with good thermal conductivity, and the resistance wire 21 can keep the temperature of the mixing box to the target temperature to better meet the output temperature.

[0034] Embodiment 2 This embodiment proposes an enhanced aeration remediation method for real-time adjustment of the temperature and humidity of the steam in the contaminated soil, and the operation steps are as follows: Step one, find out the location and distribution range of the contaminated area of volatile organic pollutants; In detail, in this embodiment, the contaminated area of volatile organic pollutants is distributed in the saturated soil body 1-1.5 meters underground, about 0.5 meters thick, and the total content is 100 kg.

[0035] Step two, installation of the aeration remediation device; In detail, the portable drilling machine is used to drill the connected drill-in head 16 together with the aeration pipe 15 and the gas delivery pipe section 14 into the soil, so that the aeration is placed in the contaminated area of volatile organic pollutants.

[0036] Step three, connection of the steam device; In detail, the steam generator 8 is placed at the mixing box 6, the second gas outlet pipe is connected with the mixing box, and the power supply is connected to operate.

[0037] Step four, installation of the gas mixing device; In detail, the mixing box 6 is installed at the top of the gas delivery pipe section 14; the second gas injection pipe 23 and the first gas injection pipe 20 at the top of the mixing box 6 are respectively connected with the air compressor 1 and the steam generator 8.

[0038] Step five, start aeration; Start the air compressor and adjust the pressure regulating valve to the predetermined aeration pressure.

[0039] In detail, turn on the switch 4 and the steam generator 8, and the steam and compressed gas enter the mixing box 6 for mixing operation, and the mixed compressed gas and steam are sent to the aeration pipe 15 and released from the uniformly distributed aeration holes 17 of the aeration pipe, forming a seepage channel in the contaminated area of volatile organic pollutants. The volatile organic pollutants enter the seepage channel by diffusion, a part of which is volatilized to the gas collection tank 10 for treatment through the uniformly distributed pressure release holes 13 on the wall of the pressure release pipe 12, and a part of the complex organic pollutants is volatilized to the unsaturated zone with the steam, and finally volatilized to the gas collection tank 10 for treatment through the pressure release pipe 12.

[0040] Step six, real-time adjustment; In detail, the collecting mechanism is used for recording the removal efficiency of the organic pollutants. The gas monitor 11 and the electronic flow meter 9 record the content of the pollutants. The information processing mechanism is used for processing the recorded removal efficiency to determine whether the removal efficiency decreases and whether the repair index is reached. If not, the steam generator 8, the mixing tank 6, the air compressor 1 and the heat tracing belt 5 are controlled reversely to increase the steam temperature and the aeration pressure, and the above operation is repeated until the removal index is reached. Thus, the removal of the volatile organic pollutants in the soil is achieved.

[0041] In summary, by the aeration device and the steam cooperative aeration method, the aeration work efficiency and the removal rate of VOCs can be greatly improved on the basis of the traditional aeration work, and the energy consumption is reduced.

[0042] The above embodiments are only preferred embodiments of the present application, and cannot be used to limit the protection scope of the present application. Any non-essential changes and replacements made by those skilled in the art on the basis of the present application shall fall within the protection scope of the present application.

Claims

1. An enhanced aeration remediation device based on real-time regulation of vapor temperature and humidity, characterized in that, It comprises: an aeration pipe (15) for penetrating into the contaminated area of the soil (18), the surface of which is provided with aeration holes (17); a gas supply device (1) for generating compressed gas with a predetermined pressure; a steam generator (8) for generating superheated steam; a mixing box (6) with its input end connected to the gas supply device (1) and the steam generator (8) respectively and its output end connected to the aeration pipe (15), and an auxiliary mechanism (21) provided inside the mixing box (6) for uniformly mixing the compressed gas and the steam and maintaining the temperature of the mixed gas; an extraction mechanism (12) provided in the contaminated area for extracting the volatile organic compounds; a collection mechanism for recording the removal efficiency and content of the organic pollutants in real time; an information processing mechanism connected to the collection mechanism for reversely controlling the steam generator (8), the mixing box (6) and the gas supply device (1) based on the removal efficiency data until the removal index is reached.

2. The enhanced aeration remediation device based on real-time vapor temperature and humidity control according to claim 1, wherein: The free end of the aeration pipe (15) is provided with a drilling head (16), and the input end of the drilling head (16) is connected to at least two detachable gas conveying pipe sections (14); the adjacent gas conveying pipe sections (14) and the gas conveying pipe sections (14) and the aeration pipe (15) are fixed by screwing.

3. The enhanced aeration remediation device based on real-time vapor temperature and humidity control according to claim 1, wherein: The gas supply device comprises an air compressor (1), and the output end of the air compressor (1) is connected to the mixing box (6) through a first gas outlet pipe (7); a pressure regulating valve (2), a flow meter (3), a switch (4) and a heat tracing tape (5) are installed on the first gas outlet pipe (7) in sequence along the gas transmission direction.

4. The enhanced aeration remediation device based on real-time vapor temperature and humidity control according to claim 1, wherein: The output end of the steam generator (8) is connected to the mixing box (6) through a second gas outlet pipe (24), and the second gas outlet pipe (24) is provided with a heat tracing tape (5).

5. The enhanced aeration remediation device based on real-time vapor temperature and humidity control of claim 1, wherein: The extraction mechanism comprises a pressure relief pipe (12) with a plurality of pressure relief holes (13) uniformly opened in the axial direction, and the output end of the pressure relief pipe (12) is connected to a gas collection box (10) provided with a negative pressure pump.

6. The enhanced aeration remediation device based on real-time vapor temperature and humidity control of claim 1, wherein: The collection mechanism comprises an electronic flow meter (9) and a gas detector (11) for monitoring the extraction flow and content of the pollutants in real time.

7. The enhanced aeration remediation device based on real-time vapor temperature and humidity control of claim 1, wherein: The auxiliary mechanism in the mixing box (6) is an electric resistance wire (21) for stabilizing the temperature in the box within a target range.

8. The enhanced aeration remediation device based on real-time vapor temperature and humidity control of claim 1, wherein: A cylindrical body with a first lumen is provided in the mixing box (6), and the outer side of the cylindrical body is connected to a multi-hole nozzle (19); a first gas injection pipe (20) and a second gas injection pipe (23) are provided on the top of the mixing box (6) and are connected to the gas supply device (1) and the steam generator (8) respectively.

9. The enhanced aeration remediation device based on real-time vapor temperature and humidity control of claim 1, wherein: The information processing mechanism is connected to the steam generator (8), the heat tracing tape (5), the air compressor (1) and the mixing box (6) through wires to realize closed-loop parameter control.

10. An enhanced aeration remediation method based on real-time control of vapor temperature and humidity, using the device of any one of claims 1-9, characterized in that, It comprises the following steps: Step 1, penetrating the aeration pipe (15) into the contaminated area; Step 2, synchronously inputting the compressed gas and the superheated steam into the mixing box (6), and then conveying the mixed gas to the aeration pipe (15); Step 3, extracting the volatile organic compounds through the extraction mechanism (12); Step 4, monitoring the removal efficiency of the pollutants in real time; Step 5, reversely adjusting the steam temperature, gas pressure and mixing temperature based on the removal efficiency data until the standard is reached.

Images