A skid-mounted thermal desorption system for blowing and piling

Abstract

The present invention relates to the technical field of soil remediation. A skid-mounted air stripping and piling thermal desorption system comprises a skid-mounted reaction tank, which comprises a tank body with both upper and lower ends open, a movable feed plate connected to the upper end of the tank body, and a discharge plate slidably connected to the bottom of the tank body; further comprising heating plates arranged from left to right, the heating plates being arranged vertically, the heating plates comprising cavities surrounded by metal plates, a gas pipe for conveying hot gas being fixed in the cavity; the gas inlet end of the gas pipe being connected to the gas outlet of a burner; further comprising a stirring hot gas stripping assembly, the stirring hot gas stripping assembly comprising a stirring shaft, a stirring shaft being provided between adjacent heating plates, the end of the stirring shaft extending out of the skid-mounted reaction tank; the stirring shaft comprising a hollow shaft and a gas outlet nozzle, the gas outlet nozzle being connected to the hollow shaft, and the hollow shaft being connected to the gas outlet end of the gas pipe via a rotary joint. Batch processing of soil is achieved through the combination of the movable feed plate and the discharge plate. The efficiency of contaminated soil remediation is improved by the heating plates and the stirring hot gas stripping assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of soil remediation, and in particular to a thermal desorption system. Background Art

[0002] With the rapid development of China's social economy and the further acceleration of industrialization and urbanization, soil issues have received great attention from the whole society. Common contaminated soil remediation technologies include thermal desorption remediation technology, chemical redox remediation technology, solidification and stabilization remediation technology, soil leaching remediation technology, phytoremediation technology, and microbial remediation technology. Thermal desorption technology has significant advantages such as high pollutant removal rate, short remediation cycle, and strong applicability. Therefore, it is widely used in soil remediation projects in organic contaminated sites. The pile thermal desorption technology is a type of thermal desorption remediation technology. Its technical principle is to heat the contaminated soil in the pile under micro-negative pressure conditions and maintain it at a certain temperature, so as to promote the desorption of pollutants from the soil, and extract the pollutants by extraction, and then carry out tail gas treatment to finally achieve the remediation of contaminated soil.

[0003] However, the construction period of thermal desorption remediation is long. It often takes 30-100 days to repair a batch of contaminated soil. In addition, the construction of thermal desorption is relatively complicated. The excavated contaminated soil needs to be stacked into a set pile according to the design requirements and an insulation layer needs to be built. At the same time, the radiation area of the heating system is limited and cannot fully heat all the contaminated soil. Summary of the Invention

[0004] In response to the problems existing in the prior art, the present invention provides a skid-mounted air stripping and stacking thermal desorption system, which has solved at least one of the above technical problems.

[0005] The technical solution of the present invention is: a skid-mounted air stripping and stacking thermal desorption system, characterized by comprising a skid-mounted reaction tank, wherein the skid-mounted reaction tank comprises a tank body with both upper and lower ends open, the upper end of the tank body being connected to an openable and closable movable feed plate, and the bottom of the tank body being slidably connected to a discharge plate;

[0006] The device further comprises a heating plate arranged from left to right, the heating plate being arranged vertically, the heating plate comprising a cavity surrounded by a metal plate, a gas pipe for conveying hot gas being fixed in the cavity, and both ends of the gas pipe extending out of the cavity;

[0007] The air inlet end of the air delivery pipe is connected to the air outlet of a burner;

[0008] It also includes a stirring hot gas stripping assembly, the stirring hot gas stripping assembly includes a horizontally arranged stirring shaft, one of the stirring shafts is provided between adjacent heating plates, and the end of the stirring shaft extends out of the skid-mounted reaction tank;

[0009] The stirring shaft includes a hollow shaft and an air outlet nozzle, the air outlet nozzle is connected to the hollow shaft, and the hollow shaft is connected to the air outlet end of the air pipe through a rotary joint.

[0010] The present invention facilitates top-in and bottom-out processing of soil through the combination of a movable feed plate and a discharge plate, and realizes batch processing of soil. The heating plate and the stirring hot air stripping component improve the efficiency of contaminated soil remediation.

[0011] Further preferably, the outer wall of the skid-mounted reaction tank is covered with a refractory layer.

[0012] Further preferably, a condensing device, a first overflow valve, a gas storage tank and a second overflow valve which are connected in sequence are installed between the gas outlet end of the gas pipe and the hollow shaft.

[0013] The condensing device can be used to easily adjust the temperature of the output gas from the stirring hot gas stripping component.

[0014] Further preferably, a temperature sensor is installed in the gas storage tank.

[0015] More preferably, it further comprises an exhaust pipe, one end of the exhaust pipe extends into the skid-mounted reaction tank, and the other end of the exhaust pipe is connected to an exhaust gas treatment device.

[0016] Further preferably, the discharge plate and the trough body are connected by an electric telescopic rod.

[0017] It is convenient to realize the electric pushing of the discharge plate.

[0018] Further preferably, the movable feed plates are hinged to both left and right ends of the trough body.

[0019] Further preferably, the end of the hollow shaft extends out of the slot body, and a gear is fixed to the end of the hollow shaft extending out of the slot body;

[0020] A spur rack meshing with the gear is slidably connected to the outer wall of the trough;

[0021] It also includes a driving mechanism for driving the spur rack to slide.

[0022] It is convenient to realize the synchronous rotation of all stirring shafts.

[0023] Alternatively, the end of the hollow shaft extends out of the slot body, and a gear is fixed to the end of the hollow shaft extending out of the slot body;

[0024] All the gears are linked via a chain, and one of the gears is linked to a driving gear, which is mounted on a driving motor.

[0025] It is convenient to realize the synchronous rotation of all stirring shafts.

[0026] Further preferably, the air outlet nozzle is a stirring tooth, and the material of the stirring tooth is manganese steel.

[0027] Beneficial Effects: The system's ease of installation, overall relocation, and small equipment footprint make it suitable for complex, multi-site operations. The top-down, bottom-out contaminated soil loading and unloading design enables sequential soil remediation while reducing secondary contamination from spilled contaminated soil. Non-point source heating and agitated hot air stripping improve contaminated soil remediation efficiency, resolving the complex construction and long remediation cycles associated with existing thermal desorption systems. The traditional 30-100-day remediation cycle can be reduced to less than ten days. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A top view of a specific embodiment 1 of the present invention;

[0029] Figure 2 This is a front view of a specific embodiment 1 of the present invention;

[0030] Figure 3 This is a schematic diagram of the partial structure of specific embodiment 1 of the present invention.

[0031] In the figure: 1 is the tank body, 2 is the refractory layer, 3 is the feed plate, 4 is the heating plate, 5 is the stirring hot gas blowing component, 6 is the discharge plate, 7 is the exhaust pipe, 8 is the exhaust fan, 10 is the condensing device, 11 is the first overflow valve, 12 is the gas storage tank, 13 is the second overflow valve, and 14 is the exhaust gas treatment device. DETAILED DESCRIPTION

[0032] The present invention will be further described below with reference to the accompanying drawings.

[0033] See also Figures 1 to 3 , Specific embodiment 1, a skid-mounted air stripping and stacking thermal desorption system, including a skid-mounted reaction tank, the skid-mounted reaction tank includes a tank body 1 with openings at both the upper and lower ends, the upper end of the tank body 1 is connected to a movable feed plate 3 that can be opened and closed, and the bottom of the tank body 1 is slidably connected to a discharge plate 6; it also includes a heating plate 4 arranged from left to right, the heating plate 4 is arranged vertically, the heating plate 4 includes a cavity surrounded by metal plates, a gas pipe for conveying hot gas is fixed in the cavity, and both ends of the gas pipe extend out of the cavity; the air inlet end of the gas pipe is connected to the air outlet of a burner; it also includes a stirring hot gas stripping component 5, the stirring hot gas stripping component 5 includes a horizontally arranged stirring shaft, a stirring shaft is provided between adjacent heating plates 4, and the end of the stirring shaft extends out of the skid-mounted reaction tank; the stirring shaft includes a hollow shaft and an air outlet nozzle, the air outlet nozzle is connected to the hollow shaft, and the hollow shaft is connected to the air outlet end of the gas pipe through a rotary joint. The present invention facilitates top-in and bottom-out processing of soil through the combination of the movable feed plate 3 and the discharge plate 6. The heating plate 4 and the stirring hot air stripping component improve the efficiency of contaminated soil remediation.

[0034] The air outlet nozzle is a stirring tooth, and the material of the stirring tooth is manganese steel. The length of the stirring tooth is 20cm-30cm. It is convenient for sufficient stirring. The stirring teeth are tilted outward from front to back, and adjacent stirring teeth form an angle. Preferably, a 120° angle is formed. The speed of the stirring shaft is preferably 0-10r / min, and the air outlet rate of the air outlet nozzle is preferably 0-5m 3 / min.

[0035] The spacing between the left heating plate and the left side wall of the tank body is preferably 1 / 2 of the spacing between adjacent heating plates. A valve and a pump body can be connected between the gas outlet end of the burner and the heating plate.

[0036] The inner wall or outer wall of the tank body 1 is coated with a refractory layer 2. The refractory layer can be clay bricks, high-alumina bricks, mullite bricks, corundum bricks, clay castables, high-alumina casting materials, high-alumina spray coatings, and low-temperature curing grouting materials.

[0037] The metal plate can be copper, copper alloy, aluminum or aluminum alloy plate, or a graphene plate.

[0038] A condensing device 10, a first overflow valve 11, a gas storage tank 12 and a second overflow valve 13 are installed between the gas outlet end of the gas transmission pipe and the hollow shaft, which are connected in sequence. The condensing device facilitates the adjustment of the temperature of the output gas of the stirring hot gas stripping assembly. A temperature sensor is installed in the gas storage tank. It also includes an exhaust pipe 7, one end of which extends into the skid-mounted reaction tank, and the other end of the exhaust pipe is connected to the exhaust fan 8 and the exhaust gas treatment device 14. One end of the exhaust pipe extends into the area between the right side of the tank body and the heating plate located on the far right. One end of the exhaust pipe 7 extends into the top of the skid-mounted reaction tank. The exhaust pipe is provided with at least three branch pipes extending into the skid-mounted reaction tank. The branch pipe is the air inlet end.

[0039] The discharge plate 6 is connected to the tank body 1 via an electric telescopic rod, which facilitates the electric propulsion of the discharge plate 6.

[0040] The left and right ends of the tank body 1 are both hinged with movable feeding plates 3.

[0041] The end of the hollow shaft extends out of the trough, and a gear is fixed to the end extending out of the trough. A spur rack is slidably connected to the outer wall of the trough, meshing with the gear. A drive mechanism is also included to drive the spur rack. This facilitates the synchronous rotation of all agitator shafts. Alternatively, the end of the hollow shaft extends out of the trough, and a gear is fixed to the end extending out of the trough. All gears are linked by a chain, and one of the gears is linked to a driving gear mounted on the drive motor. This facilitates the synchronous rotation of all agitator shafts.

[0042] During the construction process, the skid-mounted reaction tank is first fixed on a 3-3.5m high bracket. The contaminated soil is fed into the skid-mounted reaction tank with an excavator or forklift through the electrically openable and movable feed plate. During use, the burner ignites the pumped natural gas and air, and the combustion gas fills the heating plate along the gas pipeline. The residual heat is controlled by the condensing device and the gas storage tank to enter the stirring hot gas stripping component 5. The contaminated soil is evenly heated by the heating plate and the stirring hot gas stripping component 5. When the contaminated soil is heated to a certain temperature, the pollutants in the soil are converted from liquid to gas and escape from the soil. At this time, the exhaust fan 8 is started, and the exhaust gas of the contaminated soil enters the exhaust gas treatment device. When the soil remediation meets the standards, the lower discharge plate is activated, and the remediated soil falls into the dump truck below by gravity, realizing the remediation and treatment of the contaminated soil.

[0043] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A skid-mounted stripping and piling thermal desorption system, characterized in that: The skid-mounted reaction tank comprises a tank body with openings at the upper and lower ends, an openable and closable movable feed plate connected to the upper end of the tank body, and a discharge plate slidably connected to the bottom of the tank body; The device further comprises a heating plate arranged from left to right, the heating plate being arranged vertically, the heating plate comprising a cavity surrounded by a metal plate, a gas pipe for conveying hot gas being fixed in the cavity, and both ends of the gas pipe extending out of the cavity; The air inlet end of the air delivery pipe is connected to the air outlet of a burner; It also includes a stirring hot gas stripping assembly, the stirring hot gas stripping assembly includes a horizontally arranged stirring shaft, one of the stirring shafts is provided between adjacent heating plates, and the end of the stirring shaft extends out of the skid-mounted reaction tank; The stirring shaft includes a hollow shaft and an air outlet nozzle, the air outlet nozzle is connected to the hollow shaft, and the hollow shaft is connected to the air outlet end of the air pipe through a rotary joint; The outer wall of the skid-mounted reaction tank is coated with a refractory layer; It also includes an exhaust pipe, one end of which extends into the skid-mounted reaction tank, and the other end of which is connected to an exhaust gas treatment device.

2. The skid-mounted stripping and piling thermal desorption system according to claim 1 is characterized by: A condensing device, a first overflow valve, a gas storage tank and a second overflow valve which are connected in sequence are installed between the gas outlet end of the gas delivery pipe and the hollow shaft.

3. The skid-mounted stripping and piling thermal desorption system according to claim 2 is characterized in that: A temperature sensor is installed in the gas storage tank.

4. The skid-mounted air stripping and thermal desorption system according to claim 1, characterized in that: The discharge plate and the trough body are connected via an electric telescopic rod.

5. The skid-mounted stripping and piling thermal desorption system according to claim 1 is characterized in that: The movable feeding plates are hinged at both left and right ends of the trough body.

6. The skid-mounted stripping and thermal desorption system according to claim 1, characterized in that: The end of the hollow shaft extends out of the slot body, and a gear is fixed to the end of the hollow shaft extending out of the slot body; A spur rack meshing with the gear is slidably connected to the outer wall of the trough; It also includes a driving mechanism for driving the spur rack to slide.

7. The skid-mounted stripping and piling thermal desorption system according to claim 1, characterized in that: The end of the hollow shaft extends out of the slot body, and a gear is fixed to the end of the hollow shaft extending out of the slot body; All the gears are linked via a chain, and one of the gears is linked to a driving gear, which is mounted on a driving motor.

8. The skid-mounted stripping and piling thermal desorption system according to claim 1, characterized in that: The distance between the leftmost heating plate and the left side wall of the tank body is 1 / 2 of the distance between adjacent heating plates.

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