CN112872007B - Contaminated soil normal position solar thermal desorption repair system - Google Patents
Contaminated soil normal position solar thermal desorption repair system Download PDFInfo
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- CN112872007B CN112872007B CN202110127461.5A CN202110127461A CN112872007B CN 112872007 B CN112872007 B CN 112872007B CN 202110127461 A CN202110127461 A CN 202110127461A CN 112872007 B CN112872007 B CN 112872007B
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- 239000002689 soil Substances 0.000 title claims abstract description 70
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Images
Classifications
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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
Abstract
The invention provides an in-situ solar thermal desorption remediation system for contaminated soil, which belongs to the technical field of contaminated soil remediation and comprises a support frame, a heat collecting pipe, a heat collecting cover, a reflector, a gas supply part, a gas injection pipeline and a gas extraction pipeline; the heat collecting pipe is rotatably arranged on the supporting frame, and a spiral part is arranged on the outer side of the heat collecting pipe; the heat collecting cover is arranged on the support frame and sleeved outside the heat collecting pipe; an exhaust gas channel for the exhaust gas to pass through is formed between the heat collecting tube and the heat collecting cover; the reflector is used for reflecting sunlight to the heat collecting tube. According to the in-situ solar thermal desorption remediation system for the polluted soil, the gas is heated by solar energy, so that the energy consumption is reduced; when the waste gas generated by thermal desorption passes through the waste gas channel, the waste gas exchanges heat with the gas in the heat collecting pipe, and the heat of the waste gas is utilized to carry out secondary heating on the gas in the heat collecting pipe, so that the utilization rate of energy is improved, the energy loss is reduced, and the heating efficiency of the gas in the heat collecting pipe is also improved.
Description
Technical Field
The invention belongs to the technical field of contaminated soil remediation, and particularly relates to an in-situ solar thermal desorption remediation system for contaminated soil.
Background
The thermal desorption technology is to heat the contaminated soil to a temperature above the boiling point of the target contaminant to achieve the purpose of separating and removing the contaminant from the soil particles. In the heating process, the target pollutants are subjected to evaporation, distillation, boiling, oxidation, pyrolysis and other actions, the pollutants are converted from one phase to the other phase, and the liquidity is greatly improved. The in-situ thermal desorption technology separates the target pollutants from the soil under the negative pressure condition on the premise of not changing the position of the polluted soil, and finally thoroughly eliminates or concentrates and collects the target pollutants in a waste gas treatment facility. The remediation technology can efficiently remove volatile and semi-volatile organic pollutants (such as polycyclic aromatic hydrocarbon, pesticide, petroleum hydrocarbon and polychlorinated biphenyl) in the polluted soil, and the removal rate of the pollutants can reach more than 99.98 percent.
The thermal desorption technology can be divided into in-situ thermal desorption and ex-situ thermal desorption according to different treatment positions, compared with ex-situ thermal desorption, the in-situ thermal desorption technology does not need to dig polluted soil, and secondary pollution is small; and has more excellent repairing effect on the polluted soil with deeper depth and higher pollutant concentration.
The thermal desorption remediation technology is one of important polluted soil remediation technologies, and is mature and widely applied to remediation of foreign organic polluted soil at present. In recent years, some thermal desorption processes and devices have appeared in China, but all have certain disadvantages, such as: the energy consumption is higher, and the waste gas collecting effect is relatively poor.
Disclosure of Invention
The invention aims to provide an in-situ solar thermal desorption repair system for polluted soil, and aims to solve the problems of high energy consumption and poor waste gas collection effect of the conventional in-situ thermal desorption device for the polluted soil.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a pollute soil normal position solar thermal desorption repair system, includes: the solar heat collector comprises a support frame, a heat collecting pipe, a heat collecting cover, a reflecting plate, a gas supply part, a gas injection pipeline and a gas extraction pipeline; the heat collecting pipe is rotatably arranged on the supporting frame; the outer side of the heat collecting pipe is provided with a spiral part; the heat collecting cover is arranged on the support frame and sleeved outside the heat collecting pipe; an exhaust gas channel for exhaust gas to pass through is formed between the heat collecting cover and the heat collecting pipe; the reflector is arranged on the support frame and positioned outside the heat collection cover; the reflector is used for reflecting sunlight to the heat collecting tube and heating gas in the heat collecting tube; the gas supply part is used for introducing gas into the heat collecting pipe; the gas injection pipeline is communicated with the heat collecting pipe and is used for injecting high-temperature gas into the polluted soil; the air extraction pipeline is communicated with the waste gas channel and is positioned on one side of the air injection pipeline and used for extracting waste gas generated by thermal desorption in polluted soil.
As another embodiment of the present application, a sealing cover for sealing the opening end of the heat collecting tube is arranged on the support frame, a partition plate is installed on the sealing cover, and the partition plate is in sliding fit with the inner side wall of the heat collecting tube and divides the inner cavity of the heat collecting tube into a first cavity and a second cavity which are communicated with each other; the sealing cover is provided with an air inlet pipe and an air outlet pipe, the air inlet pipe is communicated with the air supply piece and the first cavity, and the air outlet pipe is communicated with the air injection pipeline and the second cavity.
As another embodiment of the application, the heat collecting cover is rotatably installed on the supporting frame, and the heat collecting cover is provided with a connecting mechanism for installing the reflecting plate.
As another embodiment of the present application, the connection mechanism includes:
the two support rods are rotatably mounted on the heat collection cover, supporting blocks are arranged on the support rods, and the supporting blocks are rotatably connected with the support rods;
the sliding block is in threaded connection with the two supporting rods, and one end of the reflecting plate is hinged with the sliding block; and
the connecting rod is hinged with the supporting block and the reflector respectively;
the supporting rod drives the sliding block to do reciprocating motion along the axial direction of the supporting rod, and the connecting rod drives the reflecting plate to rotate, so that the refraction angle of the reflecting plate is changed.
As another embodiment of the present application, the number of the light reflecting plates is two, and the light reflecting plates are symmetrically arranged on two sides of the slider.
As another embodiment of this application, the support frame with be equipped with worm gear mechanism between the heat collecting cover, worm gear mechanism is used for the drive the heat collecting cover is around pivoting.
As another embodiment of this application, pollute soil normal position solar thermal desorption repair system still includes collects the cover, it establishes to collect the cover the exhaust duct outside, collect the cover with exhaust gas channel's inlet end intercommunication.
As another embodiment of this application, be equipped with spiral helicine air exhaust groove on air exhaust pipeline's the outer wall, air exhaust groove with collect the cover intercommunication.
As another embodiment of the present application, the gas injection pipe comprises an inner pipe and an outer pipe; the side wall of the outer pipe is provided with an exhaust hole; one end of the inner pipe is communicated with the air outlet pipe, and the other end of the inner pipe extends into the outer pipe; an exhaust passage for passing high-temperature gas is formed between the inner pipe and the outer pipe.
As another embodiment of the present application, the aperture of the exhaust hole is gradually increased from top to bottom.
The in-situ solar thermal desorption remediation system for the polluted soil, provided by the invention, has the beneficial effects that: compared with the prior art, the in-situ solar thermal desorption repair system for the polluted soil, disclosed by the invention, has the advantages that the gas supply piece introduces gas into the heat collecting tube, sunlight is reflected by the reflector plate and irradiated onto the heat collecting tube, so that the gas in the heat collecting tube is heated, and the heated high-temperature gas is introduced into the polluted soil through the gas injection pipeline, so that the organic pollutants in the polluted soil are thermally desorbed; the heat collecting pipe is driven to rotate around the shaft, so that the gas in the heat collecting pipe is heated more uniformly, and the heating efficiency is improved; the heat collecting pipe drives the spiral part to synchronously rotate, negative pressure is formed in a waste gas channel formed between the heat collecting pipe and the heat collecting cover, power for extracting waste gas is provided for the air exhaust pipeline, the waste gas near the air exhaust pipeline can quickly enter the air exhaust pipeline, and the waste gas collecting efficiency and the waste gas collecting rate are improved; when the waste gas generated by thermal desorption passes through the waste gas channel, the waste gas exchanges heat with the gas in the heat collecting pipe, and the heat of the waste gas is utilized to carry out secondary heating on the gas in the heat collecting pipe, so that the utilization rate of energy is improved, the energy loss is reduced, and the heating efficiency of the gas in the heat collecting pipe is also improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an in-situ solar thermal desorption remediation system for contaminated soil according to an embodiment of the present invention;
FIG. 2 is a sectional view taken along line A-A of FIG. 1;
fig. 3 is a partial enlarged view of fig. 1 at B;
FIG. 4 is an enlarged view of a portion of FIG. 1 at C;
FIG. 5 is an enlarged view of a portion of FIG. 1 at D;
fig. 6 is a schematic view of an installation structure of the sealing cover and the partition plate according to the second embodiment of the present invention.
In the figure: 1. a support frame; 101. a sealing cover; 102. a partition plate; 103. an air inlet pipe; 104. an air outlet pipe; 105. opening the gap; 106. rotating the pressing plate; 107. a drive motor; 108. an electrical heating element; 2. a heat collecting pipe; 201. a screw; 202. an exhaust gas passage; 203. a first cavity; 204. a second cavity; 205. a solar panel; 3. a heat collection cover; 301. a heat-insulating layer; 302. a support bar; 303. a slider; 304. a connecting rod; 305. a support block; 4. a reflector; 5. a gas supply member; 6. a gas injection pipe; 601. an inner tube; 602. an outer tube; 603. an exhaust hole; 7. an air extraction pipeline; 701. an air exhaust groove; 8. a worm and gear mechanism; 801. a worm gear; 802. a worm; 9. a collection hood; 10. an exhaust gas treatment device.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 and fig. 2 together, the in-situ solar thermal desorption remediation system for contaminated soil according to the present invention will now be described. Contaminated soil normal position solar thermal desorption repair system includes: the solar heat collector comprises a support frame 1, a heat collecting pipe 2, a heat collecting cover 3, a reflecting plate 4, an air supply part 5, an air injection pipeline 6 and an air extraction pipeline 7; the heat collecting pipe 2 is rotatably arranged on the support frame 1, and the outer side of the heat collecting pipe 2 is provided with a spiral part 201; the heat collecting cover 3 is arranged on the support frame 1 and sleeved outside the heat collecting pipe 2; an exhaust gas channel 202 for exhaust gas to pass through is formed between the heat collecting pipe 2 and the heat collecting cover 3; the reflector 4 is arranged on the support frame 1 and positioned outside the heat collecting cover 3; the reflector 4 is used for reflecting sunlight to the heat collecting tube 2 so as to heat the gas in the heat collecting tube 2; the gas supply part 5 is used for introducing gas into the heat collecting pipe 2; the gas injection pipeline 6 is communicated with the heat collecting pipe 2 and is used for injecting high-temperature gas into the polluted soil; the air extraction pipeline 7 is communicated with the waste gas channel 202 and is positioned on one side of the air injection pipeline 6 and used for extracting waste gas generated by thermal desorption in the polluted soil.
Compared with the prior art, the in-situ solar thermal desorption repair system for the polluted soil, which is provided by the invention, has the advantages that the gas supply piece 5 introduces gas into the heat collecting tube 2, sunlight irradiates the heat collecting tube 2 through the reflection of the reflector plate 4, so that the gas in the heat collecting tube 2 is heated, and the heated high-temperature gas is introduced into the polluted soil through the gas injection pipeline 6, so that the organic pollutants in the polluted soil are thermally desorbed; the heat collecting pipe 2 is driven to rotate around the shaft, so that the gas in the heat collecting pipe 2 is heated more uniformly, and the heating efficiency is improved; the heat collecting pipe 2 drives the spiral part 201 to synchronously rotate, negative pressure is formed in a waste gas channel 202 formed between the heat collecting pipe 2 and the heat collecting cover 3, power for extracting waste gas is provided for the air exhaust pipeline 7, so that the waste gas near the air exhaust pipeline 7 can quickly enter the air exhaust pipeline 7, and the waste gas collecting efficiency and the waste gas collecting rate are improved; when the waste gas generated by thermal desorption passes through the waste gas channel 202, the waste gas exchanges heat with the gas in the heat collecting tube 2, and the gas in the heat collecting tube 2 is heated secondarily by using the heat of the waste gas, so that the utilization rate of energy is improved, the energy loss is reduced, and the heating efficiency of the gas in the heat collecting tube 2 is also improved.
In this embodiment, the heat collecting tube 2 and the heat collecting cover 3 are both cylindrical and are installed on the support frame 1 along the horizontal direction. The spiral part 201 is fixed on the outer wall of the heat collecting tube 2 in a welding mode and is in sliding fit with the inner wall of the heat collecting cover 3. The heat collecting pipe 2 and the heat collecting cover 3 are made of glass materials, have good light transmission and high temperature resistance, and ensure that sunlight can smoothly pass through the heat collecting cover 3 and the heat collecting pipe 2 and then heat gas.
The reflector 4 is an arc-shaped plate, the inner side surface of the reflector 4 is a reflecting surface, and the reflector 4 reflects light rays to the heat collecting tube 2 in a concentrated manner by means of the reflecting surface.
The air supply member 5 may be a blower or an air compressor, etc.
As a specific embodiment of the in-situ solar thermal desorption remediation system for contaminated soil provided by the invention, please refer to fig. 1 to 3, a sealing cover 101 for sealing an opening end of a heat collecting tube 2 is arranged on a support frame 1, a partition plate 102 is arranged on the sealing cover 101, and the partition plate 102 is in sliding fit with an inner side wall of the heat collecting tube 2 and divides an inner cavity of the heat collecting tube 2 into a first cavity 203 and a second cavity 204 which are communicated with each other; the sealing cover 101 is provided with an air inlet pipe 103 and an air outlet pipe 104, the air inlet pipe 103 is communicated with the air supply part 5 and the first cavity 203, and the air outlet pipe 104 is communicated with the air injection pipeline 6 and the second cavity 204. In this embodiment, one end of the heat collecting tube 2 is an opening structure, and the other end is a sealing structure. The support frame 1 is provided with a mounting hole for mounting the sealing cover 101, and the sealing cover 101 is fixed on the support frame 1 through threads and blocks the opening of the heat collecting tube 2. The partition plate 102 is fixed on the sealing cover 101 and extends to the inside of the heat collecting pipe 2, and the heat collecting pipe 2 rotates relatively to the partition plate 102. In the working process, the air inlet pipe 103 and the air outlet pipe 104 are both in a static state, so that the assembly difficulty of the pipeline is reduced. The end of the partition 102 remote from the sealing cover 101 is provided with a gap 105, and the gap 105 is used for communicating the first cavity 203 and the second cavity 204. The gas sequentially passes through the gas inlet pipe 103, the first cavity 203, the notch 105, the second cavity 204 and the gas outlet pipe 104, and finally enters the gas injection pipeline 6. By arranging the partition plate 102 in the heat collecting pipe 2, the path of gas passing through the heat collecting pipe 2 is prolonged, the heated area of the gas is increased, and therefore the gas can be fully heated.
Referring to fig. 1 and 6, a sealing cover 101 is provided with a slot engaged with a partition plate 102, a side surface of the partition plate 102 is provided with a limiting groove, and the sealing cover 101 is correspondingly provided with a rotary pressing plate 106 engaged with the limiting groove. The end of the partition plate 102 is inserted into the slot, and then the partition plate 102 is fixed on the sealing cover 101 in a limiting manner by means of the matching installation of the rotary pressing plate 106 and the limiting groove. The partition plate 102 is installed in the above mode, and is free of installation screws, simple in structure and convenient to operate. The rotary platen 106 has a disk shape, and a rotation shaft of the rotary platen 106 is eccentrically provided. The number of the rotary pressing plates 106 is two, and the rotary pressing plates are symmetrically arranged on two sides of the partition plate 102, so that the stress of the partition plate 102 is more balanced. The rotary pressing plate 106 is located on the outer side of the sealing cover 101, when the partition plate 102 is maintained and replaced, the partition plate 102 can be pulled out from the slot only by releasing the limit of the rotary pressing plate 106 on the partition plate 102 from the outer side, the sealing cover 101 does not need to be detached from the supporting frame 1, and the maintenance efficiency is greatly improved.
As a specific embodiment of the in-situ solar thermal desorption remediation system for contaminated soil provided by the present invention, please refer to fig. 1, fig. 2, fig. 3, and fig. 5, a solar panel 205 is installed on an outer wall of the heat collecting cover 3, and the solar panel 205 is directly opposite to the reflector 4. The solar cell panel 205 can convert solar energy into electric energy and store the electric energy.
A driving motor 107 is installed on the side wall of the support frame 1, and an output shaft of the driving motor 107 is fixedly connected with the sealing end of the heat collecting tube 2 and used for driving the heat collecting tube 2 to rotate around the shaft. The solar cell panel 205 is electrically connected with the driving motor 107 to provide electric energy for the driving motor 107, so as to ensure the continuous operation of the driving motor 107.
An electric heating element 108 is provided inside the partition 102, and the electric heating element 108 is electrically connected to the solar cell panel 205. Under the condition of no sunlight (such as at night or on cloudy days), the solar cell panel 205 is conducted with the electric heating element 108, and the gas in the heat collecting tube 2 is heated by the electric heating element 108, so that the condition that the in-situ solar thermal desorption repair system for the polluted soil is operating normally under the environment condition of no sunlight can be still ensured.
The electric heating element 108 is a component that converts electric energy into thermal energy.
1. The electric heating device is divided into a single electric heating element and a composite electric heating element according to the structure: a single element of electrical heating element is made of one material; the composite electric heating element is composed of several materials.
2. The electric heating element can be divided into a metal electric heating element and a nonmetal electric heating element according to different materials: metallic electrothermal elements such as nickel-chromium wires (Ni-Cr), iron-chromium-aluminum wires (Fe-Cr-Al), nickel-iron wires (Ni-Fe), nickel-copper wires (Ni-Cu)), etc.; the non-metal electric heating elements include silicon carbide, silicon-molybdenum rods, PTC electric heating elements, electric heating paint and the like.
3. According to different shapes, the electric heating element can be divided into a metal tubular shape, a quartz tubular shape, a ceramic tubular shape, a plate shape, a square shape, an oval shape, a round shape, a ceramic coated shape and the like.
The electric heating element 108 adopted by the application is a metal tubular electric heating element, which is called an electric heating tube for short, and is a sealed electric heating element with wide application, simple structure, reliable performance and long service life in all electric heating elements.
The heat insulation layer 301 is arranged on the inner wall of the heat collection cover 3, so that heat exchange between heat in the heat collection cover 3 and the outside is avoided, and heat loss is reduced.
Referring to fig. 1 and 2, a heat collecting cover 3 is rotatably mounted on a support frame 1, and a connecting mechanism for mounting a reflector 4 is arranged on the heat collecting cover 3. In this embodiment, two opposite side surfaces of the support frame 1 are provided with annular grooves, and the heat collecting cover 3 is rotatably arranged in the annular grooves. The reflector 4 is mounted on the heat collecting cover 3 by means of a connecting mechanism. Since the irradiation angle of the sunlight changes with the change of time, in order to ensure the reflection effect of the reflector 4 to the sunlight, the angle of the reflector 4 can be matched with the irradiation angle of the sunlight by rotating the heat collecting cover 3.
Referring to fig. 1 and 2, as a specific embodiment of the in-situ solar thermal desorption remediation system for contaminated soil provided by the present invention, the connection mechanism includes: two support bars 302, a slider 303 and a link 304. The two support rods 302 are rotatably mounted on the heat collecting cover 3, the support rods 302 are provided with support blocks 305, and the support blocks 305 are rotatably connected with the support rods 302; the sliding block 303 is in threaded connection with the two support rods 302, and one end of the reflecting plate 4 is hinged with the sliding block 303; the connecting rod 304 is respectively hinged with the supporting block 305 and the reflector 4; the supporting rod 302 drives the sliding block 303 to reciprocate along the axial direction of the supporting rod 302, and the connecting rod 304 drives the reflector 4 to rotate, so as to change the refraction angle of the reflector 4. In this embodiment, the support rod 302 is perpendicular to the outer surface of the heat collecting cover 3 and fixed on the heat collecting cover 3, and the support rod 302 has a degree of freedom to rotate around the axial direction thereof. The support block 305 is fixedly mounted on the support bar 302 and has a degree of freedom to rotate about the axial direction of the support bar 302. The support block 305 is fixed to the support rod 302 by a shaft retainer ring. The shaft retainer is installed on the grooved shaft and used for fixing the hole of the part to move, and the inner diameter of the retainer is slightly smaller than the diameter of the assembling shaft. During installation, the clamp spring clamp is required to be used, the clamp mouth is inserted into the clamp hole of the retainer ring, and the retainer ring is expanded to be placed on the prefabricated shaft groove. The supporting rod 302 is driven to rotate around the shaft, so that the sliding block 303 is driven to reciprocate along the axial direction of the supporting rod 302, the sliding block 303 is enabled to be close to or far away from the supporting block 305, and the reflecting plate 4 is driven to rotate around the shaft under the action of the connecting rod 304. The reflector 4 can also rely on the connecting mechanism to realize the rotation of the reflector 4 when synchronously rotating along with the heat collecting cover 3, thereby enhancing the angle adjusting range of the reflector 4 and enabling the reflector 4 to adapt to different illumination environments.
As a specific embodiment of the in-situ solar thermal desorption remediation system for contaminated soil provided by the invention, referring to fig. 2, the number of the light reflecting plates 4 is two, and the two light reflecting plates are symmetrically arranged on two sides of the sliding block 303. In this embodiment, the length direction of the sliding block 303 is consistent with the axial direction of the heat collecting cover 3, and the light reflecting plates 4 are symmetrically arranged on two sides of the sliding block 303 along the length direction of the sliding block 303. The supporting rod 302 can drive the two reflecting plates 4 to rotate around the shaft at the same time, so that the opening and closing angle of the two reflecting plates 4 can be changed. Two reflector panels 4 can cover wider region, concentrate more sunlight and refract to thermal-collecting tube 2 on to solar energy collection efficiency has been improved.
As a specific embodiment of the in-situ solar thermal desorption remediation system for contaminated soil provided by the invention, referring to fig. 1 and 2, a worm and gear mechanism 8 is arranged between the support frame 1 and the heat collection cover 3, and the worm and gear mechanism 8 is used for driving the heat collection cover 3 to rotate around a shaft. In the present embodiment, the worm gear mechanism 8 includes a worm wheel 801 and a worm 802; the worm wheel 801 is arranged on the heat collection cover 3, and the worm 802 is rotatably arranged on the support frame 1 and is positioned on one side of the heat collection cover 3; the driving worm 802 drives the heat collecting cover 3 to rotate around the shaft, the mechanical transmission mode is adopted to drive the heat collecting cover 3 to rotate, the heat collecting cover 3 can run more stably, the worm and gear mechanism 8 can provide a self-locking function for the heat collecting cover 3, the overall structure is optimized, and the limit structure of the heat collecting cover 3 is not required to be arranged.
As a specific embodiment of the in-situ solar thermal desorption remediation system for the contaminated soil provided by the invention, referring to fig. 1, the in-situ solar thermal desorption remediation system for the contaminated soil further comprises a collection cover 9, the collection cover 9 is covered outside the air exhaust pipeline 7, and the collection cover 9 is communicated with the air inlet end of the waste gas channel 202. In this embodiment, the number of the air exhaust pipes 7 is plural, and the air exhaust pipes are arranged around the air injection pipe 6. The gas injection pipe 6 penetrates the collection hood 9 and is inserted into the contaminated soil. The collecting hood 9 is fixed on the surface of the contaminated soil and covers the whole area where the suction pipe 7 and the gas injection pipe 6 are located. Most of the exhaust gas generated by thermal desorption enters the exhaust pipeline 7, but the exhaust gas near the ground surface does not have time to enter the exhaust pipeline 7, and is directly discharged into the external atmosphere. Because collect cover 9 and covered the region that bleed pipeline 7 and gas injection pipeline 6 were located, so collect cover 9 not only can collect the waste gas in bleed pipeline 7, but also can collect the waste gas that enters into the atmosphere in a small amount, reduced the pollution of waste gas to atmospheric environment. The air exhaust pipeline 7 is arranged at an included angle with the vertical direction, has a certain inclination angle, and can increase the contact area of the air exhaust pipeline 7 and the surrounding soil, so that the collection efficiency of waste gas is improved. The included angle between the air exhaust pipeline 7 and the vertical direction can be selected according to the property and the distribution condition of pollutants in the polluted soil, and the included angle range is 30-45 degrees.
As a specific embodiment of the in-situ solar thermal desorption remediation system for contaminated soil provided by the invention, please refer to fig. 5, a spiral air extraction groove 701 is arranged on the outer wall of the air extraction pipeline 7, and the air extraction groove 701 is communicated with the collection cover 9. In this embodiment, the top end of the suction duct 7 protrudes above the surface of the contaminated soil and extends into the collecting hood 9. The air exhaust pipeline 7 is of a hollow structure, waste gas below the air exhaust pipeline 7 enters the collecting cover 9 through an inner cavity of the air exhaust pipeline 7, and waste gas on the side surface of the air exhaust pipeline 7 enters the collecting cover 9 through the air exhaust groove 701. Spiral air exhaust groove 701 can realize the quick extraction of waste gas on every side, has promoted the efficiency of exhaust pipeline 7 exhaust waste gas.
As a specific embodiment of the in-situ solar thermal desorption remediation system for contaminated soil provided by the present invention, please refer to fig. 4, the gas injection pipeline 6 includes an inner pipe 601 and an outer pipe 602; the side wall of the outer pipe 602 is provided with an exhaust hole 603; one end of the inner pipe 601 is communicated with the air outlet pipe 104, and the other end extends into the outer pipe 602; an exhaust passage for passing high-temperature gas is formed between the inner pipe 601 and the outer pipe 602. In this embodiment, the waste gas inner pipe 601 has a hollow structure and is inserted into the contaminated soil. The upper end and the lower end of the outer pipe 602 are both open structures, and the top opening of the outer pipe 602 is communicated with the collecting cover 9. The exhaust holes 603 are uniformly arranged on the sidewall of the outer tube 602. The inner tube 601 extends to the bottom end of the outer tube 602 and the bottom of the inner tube 601 communicates with the outer tube 602. The high-temperature gas enters the bottom end of the outer pipe 602 through the inner pipe 601, then enters the contaminated soil from the bottom opening and the side exhaust holes 603 of the outer pipe 602 respectively, thermal desorption is performed on the contaminated soil, and the residual high-temperature gas enters the collecting cover 9 from the top opening of the outer pipe 602, is mixed with the exhaust gas and enters the exhaust gas channel 202.
As a specific embodiment of the in-situ solar thermal desorption remediation system for contaminated soil provided by the invention, please refer to fig. 1, the in-situ solar thermal desorption remediation system for contaminated soil further includes an exhaust gas treatment device 10, the exhaust gas treatment device 10 is communicated with an exhaust gas channel 202, and a catalyst is filled in the exhaust gas treatment device 10. The exhaust gas and the oxygen are mixed together in the collecting hood 9, and then enter the exhaust gas treatment device 10 through the exhaust gas channel 202 to perform catalytic oxidation reaction, and finally the exhaust gas is catalytically degraded. By communicating the top end of the outer tube 602 with the collecting hood 9, sufficient oxygen is provided for the catalytic oxidation reaction, and the structure is more compact. When the mist of waste gas and oxygen entered into exhaust gas passageway 202, spiral part 201 on the heat collecting cover 3 played the stirring effect to this mist for waste gas and oxygen mix more evenly, here reflector panel 4 utilizes the sunlight to heat this mist simultaneously, thereby has promoted this mist's temperature, has finally accelerated the catalytic oxidation reaction rate in the exhaust gas treatment device 10.
As a specific embodiment of the in-situ solar thermal desorption remediation system for contaminated soil provided by the present invention, please refer to fig. 4, the aperture of the exhaust hole 603 gradually increases from top to bottom. In this embodiment, because the size top-down of exhaust hole 603 increases gradually, so high-temperature gas enters into in the contaminated soil more easily to can improve the content of the high-temperature gas who enters into deep soil, because high-temperature gas's density is little, can automatic upward movement, and the high-temperature gas who enters into deep soil is more, then can prolong the dwell time of high-temperature gas in contaminated soil, finally promotes the effect of carrying out thermal desorption to contaminated soil.
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 invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. Pollute soil normal position solar thermal desorption repair system, its characterized in that includes: the solar heat collector comprises a support frame, a heat collecting pipe, a heat collecting cover, a reflecting plate, a gas supply part, a gas injection pipeline and a gas extraction pipeline; the heat collecting pipe is rotatably arranged on the supporting frame; the outer side of the heat collecting pipe is provided with a spiral part; the heat collecting cover is arranged on the support frame and sleeved outside the heat collecting pipe; an exhaust gas channel for exhaust gas to pass through is formed between the heat collecting cover and the heat collecting pipe; the reflector is arranged on the support frame and positioned outside the heat collection cover; the reflector is used for reflecting sunlight to the heat collecting tube and heating gas in the heat collecting tube; the gas supply part is used for introducing gas into the heat collecting pipe; the gas injection pipeline is communicated with the heat collecting pipe and is used for injecting high-temperature gas into the polluted soil; the air extraction pipeline is communicated with the waste gas channel and is positioned on one side of the air injection pipeline and used for extracting waste gas generated by thermal desorption in the polluted soil;
the supporting frame is provided with a sealing cover for sealing the opening end of the heat collecting pipe, the sealing cover is provided with a partition plate, and the partition plate is in sliding fit with the inner side wall of the heat collecting pipe and divides the inner cavity of the heat collecting pipe into a first cavity and a second cavity which are communicated with each other; the sealing cover is provided with an air inlet pipe and an air outlet pipe, the air inlet pipe is communicated with the air supply piece and the first cavity, and the air outlet pipe is communicated with the air injection pipeline and the second cavity;
a driving motor is arranged on the side wall of the supporting frame, and an output shaft of the driving motor is fixedly connected with the sealing end of the heat collecting pipe and is used for driving the heat collecting pipe to rotate around the central shaft of the heat collecting pipe;
the heat collecting cover is characterized in that a worm and gear mechanism is arranged between the support frame and the heat collecting cover and used for driving the heat collecting cover to rotate around a central shaft of the heat collecting cover.
2. The in-situ solar thermal desorption remediation system for contaminated soil as claimed in claim 1, wherein the heat collection cover is rotatably mounted on the support frame, and a connecting mechanism for mounting the reflector is arranged on the heat collection cover.
3. The in-situ solar thermal desorption remediation system for contaminated soil as claimed in claim 2 wherein the connection mechanism comprises:
the two support rods are rotatably mounted on the heat collection cover, supporting blocks are arranged on the support rods, and the supporting blocks are rotatably connected with the support rods;
the sliding block is in threaded connection with the two supporting rods, and one end of the reflecting plate is hinged with the sliding block; and
the connecting rod is hinged with the supporting block and the reflector respectively;
the supporting rod drives the sliding block to do reciprocating motion along the axial direction of the supporting rod, and the connecting rod drives the reflecting plate to rotate, so that the refraction angle of the reflecting plate is changed.
4. The in-situ solar thermal desorption repair system for the polluted soil as claimed in claim 3, wherein the number of the light reflecting plates is two, and the light reflecting plates are symmetrically arranged on two sides of the sliding block.
5. The in-situ solar thermal desorption remediation system for contaminated soil as claimed in claim 1 further comprising a collection cover, wherein the collection cover is covered outside the air extraction pipeline and is communicated with the air inlet end of the exhaust gas channel.
6. The in-situ solar thermal desorption repair system for the polluted soil as claimed in claim 5, wherein a spiral air exhaust groove is formed in the outer wall of the air exhaust pipeline, and the air exhaust groove is communicated with the collection cover.
7. The in-situ solar thermal desorption remediation system for contaminated soil as claimed in claim 1 wherein the gas injection pipeline comprises an inner pipe and an outer pipe; the side wall of the outer pipe is provided with an exhaust hole; one end of the inner pipe is communicated with the air outlet pipe, and the other end of the inner pipe extends into the outer pipe; an exhaust passage for passing high-temperature gas is formed between the inner pipe and the outer pipe.
8. The in-situ solar thermal desorption remediation system for contaminated soil as claimed in claim 7, wherein the aperture of the vent hole is gradually increased from top to bottom.
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