Thermal desorption device for contaminated soil remediation
By introducing a dispersed conveying mechanism of a double-roll crusher, a dispersing box and a screw conveyor into the soil treatment equipment, combined with the technology of blowing rollers and impact rods, the soil agglomeration problem is solved and the soil heating efficiency in the rotary kiln is improved and dispersibility, reducing energy consumption and risk of blockage.
Patent Information
- Application Number
- CN202411508322.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-28
- Publication Date
- 2025-01-17
- Estimated Expiration
- Not applicable · inactive patent
Smart Images
Figure CN119319123A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of soil treatment equipment, and in particular to a thermal desorption device for remediation of contaminated soil. Background Art
[0002] Thermal desorption technology can effectively remove various volatile or semi-volatile organic pollutants such as petroleum hydrocarbons, benzene series, chlorinated hydrocarbons and polycyclic aromatic hydrocarbons in contaminated soil.
[0003] Thermal desorption technology mainly includes thermal desorption stage and tail gas treatment stage. The supporting treatment equipment of thermal desorption stage includes rotary kiln, which is equipped with burner and combustion-supporting fan. The supporting treatment equipment of tail gas treatment stage mainly includes cyclone dust collector, quenching tower, bag filter, activation tower, steam-water separation tower, heat exchange tower and activated carbon adsorption tower.
[0004] When treating contaminated soil by thermal desorption technology, the soil to be treated is sent into the rotary kiln, which then conveys the soil and lifts it up through its own lifting plate during the conveying process. The combustion-supporting fan cooperates with the burner to calcine the soil in the inner cavity of the rotary kiln at high temperature, so that the pollutants attached to the soil are volatilized to form a gaseous state, thereby separating the organic pollutants from the soil. After being discharged from the rotary kiln, the gaseous pollutants are sequentially sent to the cyclone dust collector, quenching tower, bag filter, activation tower, steam-water separation tower, heat exchange tower, activated carbon adsorption tower and other equipment for corresponding treatment before being discharged in compliance with the standards.
[0005] With respect to the above-mentioned related technologies, some soils are prone to agglomeration due to high humidity and other reasons. After entering the rotary kiln, the agglomerated soil is not easily lifted by the lifting plate in the rotary kiln, which affects the heating effect of the rotary kiln on the soil. At the same time, the agglomerated soil is also easy to block the discharge end of the rotary kiln. Therefore, there is room for improvement. Summary of the invention
[0006] In order to effectively restrict the agglomerated soil from entering the rotary kiln, the present application provides a contaminated soil remediation thermal desorption device.
[0007] The present application provides a contaminated soil remediation thermal desorption device, which adopts the following technical solution: A contaminated soil remediation thermal desorption device, comprising a rotary kiln body and a dispersion conveying mechanism; The dispersion and conveying mechanism includes a primary dispersion component, a secondary dispersion component and a feed conveying component; The primary dispersion assembly includes a double roll crusher; The secondary dispersion assembly includes a dispersion box, which is located at the bottom of the double-roll crusher and is connected to the double-roll crusher; a dispersion part for dispersing soil is arranged in the dispersion box; The feed conveying assembly includes a screw conveyor, which is located at the bottom of the dispersion box; a feed funnel is supported at the feed port of the screw conveyor, and the feed funnel is connected to the dispersion box; and the discharge port of the screw conveyor is connected to the feed end of the rotary kiln body.
[0008] By adopting the above technical solution, the soil to be processed is first crushed and dispersed by a double-roll crusher and then falls into a dispersion box, and then undergoes secondary dispersion treatment through a dispersion part in the dispersion box. Finally, the soil after secondary dispersion treatment falls into the screw conveyor through a feed hopper at the feed port of the screw conveyor, and is transported to the rotary kiln through the screw conveyor. The soil is dispersed multiple times by using a double-roll crusher and a dispersion part in the dispersion box, which effectively reduces the amount of agglomerated soil entering the rotary kiln, which is beneficial for the subsequent lifting plate in the rotary kiln to better lift the soil, and then the subsequent rotary kiln can heat and calcine the soil more evenly.
[0009] Preferably, the dispersion part includes a plurality of blowing rollers supported in the dispersion box, an air supply pipeline is opened in the blowing roller, and a plurality of air outlet holes are opened around the outer circumference of the blowing roller, and the air outlet holes are connected to the air supply pipeline.
[0010] By adopting the above technical solution, after the air supply pipeline on the blowing roller is connected to the air source, compressed air is continuously supplied to the air supply pipeline through the air source, and the compressed air entering the air supply pipeline is finally ejected through a plurality of air outlet holes on the outer periphery of the blowing roller. The compressed air ejected from the air outlet holes is used to disperse the soil falling into the dispersion box, so as to further improve the dispersion of the soil and reduce the occurrence of agglomerated soil.
[0011] Preferably, both ends of the blowing roller are rotatably connected in the dispersion box, and the dispersion box is provided with a first rotary drive component corresponding to the blowing roller. The first rotary drive component is drivably connected to the blowing roller for driving the blowing roller to rotate.
[0012] By adopting the above technical scheme, while the blowing roller is used to spray compressed air, the corresponding blowing roller is driven to rotate through the first rotary driving member on the dispersion box. On the one hand, the compressed air can be sprayed through different angles, which is beneficial for the compressed air sprayed by the blowing roller to disperse the soil falling into the dispersion box more comprehensively and evenly; at the same time, when the blowing roller is rotated to the point where the air outlet hole is opposite to the crushing roller of the double-roll crusher, the soil adhering to the crushing roller can be blown off by the compressed air blown out by the blowing roller, thereby cleaning the soil adhering to the periphery of the crushing roller.
[0013] Preferably, a plurality of air nozzles are connected to the outer circumference of the blowing roller corresponding to the plurality of air outlet holes, and the air nozzles are connected to the corresponding air outlet holes.
[0014] By adopting the above technical solution and setting an air nozzle, on the one hand, it is beneficial to spray out the compressed air more concentratedly; on the other hand, when the first rotary driving member drives the corresponding blowing roller to rotate, the air nozzle located on the outer periphery of the blowing roller can be used to hit the soil falling into the dispersion box, which is beneficial to further improve the dispersion of the soil.
[0015] Preferably, the dispersion part also includes a plurality of impact rods horizontally supported in the dispersion box, and the impact rods are located below the blowing roller; a plurality of second rotary driving members are arranged in the dispersion box corresponding to the plurality of impact rods, and the second rotary driving members are drivingly connected to the corresponding impact rods for driving the corresponding impact rods to rotate.
[0016] By adopting the above technical solution, the corresponding impact rod is driven to rotate by the second rotary drive member. On the one hand, the soil that subsequently falls into the dispersion box contacts the rotating impact rod during the falling process, and the rotating impact rod is used to impact and disperse the soil, so as to further reduce the occurrence of agglomerated soil; on the other hand, the rotating impact rod can buffer the impact of the falling soil on itself, which is beneficial to reduce the wear of the impact rod due to the impact of the soil.
[0017] Preferably, a plurality of air blowing knives are arranged in the feed funnel, and the air outlets of the air blowing knives are arranged toward the inner cavity of the screw conveyor.
[0018] By adopting the above technical solution, compressed air is blown toward the inner cavity of the screw conveyor through the air blowing knife. On the one hand, the compressed air blown out by the air outlet knife can blow the soil accumulated and adhered to the bottom of the feed funnel into the screw conveyor, thereby reducing the situation where the soil is accumulated at the connection between the feed funnel and the input end of the screw conveyor, which affects the fluidity of the soil in the feed funnel; on the other hand, it is beneficial to further disperse the soil that falls into the screw conveyor, so that the soil that is subsequently input into the rotary kiln through the screw conveyor can be better maintained in a dispersed state.
[0019] Preferably, the blowing roller and the blowing air knife are both connected to a hot air source.
[0020] By adopting the above technical solution, by connecting the blowing roller and the blowing air knife to the hot air source, the compressed air blown out by the subsequent blowing roller and the blowing air knife has a certain temperature. While blowing away the soil, part of the moisture in the soil can be removed, thereby reducing the subsequent re-caking of the soil; at the same time, the soil entering the rotary kiln can be preheated, thereby reducing the energy consumption of the subsequent thermal desorption treatment of the soil through the rotary kiln to a certain extent.
[0021] Preferably, the connection between the double-roll crusher and the dispersion box and the connection between the dispersion box and the feed hopper are both connected via a sealed connection structure.
[0022] By adopting the above technical solution, it is beneficial to improve the sealing performance of the connection between the dispersion box and the double-roll crusher and the connection between the dispersion box and the feed funnel, which is beneficial for the flow of the soil to be treated in a relatively closed space and reduces the leakage of the soil to be treated when flowing through the dispersion box and the feed funnel.
[0023] In summary, the present application includes at least one of the following beneficial technical effects: 1. The soil to be treated is dispersed in turn by a double-roll crusher and the dispersion part in the dispersion box, and then the dispersed soil is transported to the rotary kiln by a screw conveyor, which is helpful to reduce the agglomerated soil from entering the rotary kiln, which affects the subsequent heating efficiency of the rotary kiln on the soil.
[0024] 2. Through the arrangement of the blowing roller and the second rotary driving member, while the blowing roller is subsequently driven to rotate by the second rotary driving member, compressed air is continuously introduced into the blowing roller, and the compressed air is ejected through a plurality of air outlet holes on the outer periphery of the blowing roller; on the one hand, the compressed air ejected from the air outlet holes can be used to disperse the soil falling into the dispersion box; on the other hand, when the blowing roller rotates to the crushing roller with the air outlet holes facing the double-roll crusher, the soil adhering to the crushing roller can be blown off by the compressed air blown out from the blowing holes, so as to reduce the residual soil on the crushing roller.
[0025] 3. By arranging a number of air knives in the feed hopper and directing the air knives toward the inner cavity of the screw conveyor, on the one hand, it is helpful to reduce the accumulation of soil at the connection between the feed hopper and the feed end of the screw conveyor; on the other hand, the air knives can be used to further disperse the soil that falls into the screw conveyor, so that the soil can enter the rotary kiln in a better dispersed state. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 It is a schematic diagram of the overall structure of a thermal desorption device for contaminated soil according to an embodiment of the present application.
[0027] Figure 2 It is a structural schematic diagram used to illustrate the rotary kiln and the feed dispersion mechanism in the embodiment of the present application.
[0028] Figure 3 It is a schematic diagram used to illustrate a primary dispersion component in an embodiment of the present application.
[0029] Figure 4 It is a schematic diagram used to illustrate a secondary dispersion component in an embodiment of the present application.
[0030] Figure 5 It is a schematic diagram of the structure of the blowing roller used to illustrate the embodiment of the present application.
[0031] Figure 6 This is a schematic diagram of the structure of the feed conveying assembly used in the embodiment of the present application. Description of reference numerals: 1. Rotary kiln body; 2. Dispersing conveying mechanism; 21. Double-roll crusher; 211. Bracket; 22. Dispersing box; 221. Air blowing roller; 2210. Air inlet; 2211. Air outlet hole; 2212. Air nozzle; 222. First rotary driving member; 223. Impact rod; 224. Second rotary driving member; 23. Screw conveyor; 231. Feeding funnel; 232. Air blowing knife; 3. Flange. DETAILED DESCRIPTION
[0032] The following is combined with Figure 1-6 This application is described in further detail.
[0033] The present application discloses a contaminated soil remediation thermal desorption device, referring to Figure 1 and Figure 2 , including a rotary kiln body 1 and a dispersing and conveying mechanism 2; the dispersing and conveying mechanism 2 is arranged close to the rotary kiln body 1, and the dispersing and conveying mechanism 2 includes a primary dispersing component, a secondary dispersing component and a conveying component; the primary dispersing component includes a double-roll crusher 21; the secondary dispersing component includes a dispersing box 22, the dispersing box 22 is located at the bottom of the double-roll crusher 21 and is connected to the double-roll crusher 21; a dispersing part is arranged in the dispersing box 22, and the dispersing part is used for dispersing the soil; the conveying component includes a screw conveyor 23; the screw conveyor 23 is located at the bottom of the dispersing box 22; the feed port of the screw conveyor 23 is connected to the dispersing box 22, and the discharge port of the screw conveyor 23 extends to the feed end of the rotary kiln body 1.
[0034] The soil to be processed is dispersed by the double-roll crusher 21 and the dispersion part in the dispersion box 22, and then the dispersed soil is conveyed to the rotary kiln by the screw conveyor 23. This is to reduce the situation that the agglomerated soil enters the rotary kiln and affects the subsequent heating effect of the rotary kiln on the soil.
[0035] Reference Figure 2 and Figure 3 The bottom of the double-roll crusher 21 is supported on the ground by a bracket 211, so that the double-roll crusher 21 can be more stably supported above the dispersion box 22.
[0036] Reference Figure 4 and Figure 5The dispersion part includes two blowing rollers 221, which are respectively located below the two crushing rollers of the double-roll crusher 21; the axial direction of the blowing roller 221 is parallel to the axial direction of the crushing roller; both ends of the blowing roller are rotatably arranged in the dispersion box 22 through bearings. An air supply pipeline is formed inside the blowing roller 221, and the axial direction of the air supply pipeline coincides with the axial direction of the blowing roller 221. An air inlet is provided at one end of the blowing roller 221, and the air inlet is connected to the air supply pipeline. The end of the blowing roller 221 with the air inlet is connected to the hot air source through a rotary joint. A plurality of air outlet holes 2211 are also provided on the outer periphery of the blowing roller 221, and the plurality of air outlet holes 2211 are evenly distributed around the axial direction of the blowing roller 221; the two ends of the air outlet holes 2211 extend to the two ends of the blowing roller 221 respectively; the air outlet holes 2211 are connected to the air supply pipeline. There are two first rotary drive members 222 corresponding to the outside of the dispersion box 22. The first rotary drive members 222 are both drivingly connected to one end of the blowing roller 221 away from the air inlet to drive the corresponding blowing roller 221 to rotate; specifically, the first rotary drive member 222 is a reduction motor.
[0037] Through the arrangement of the first rotary drive member 222 and the blowing roller 221. Subsequently, while the first rotary drive member 222 drives the corresponding blowing roller 221 to rotate, compressed air is continuously introduced into the air supply pipeline in the blowing roller 221 through the hot air source, and the compressed air entering the air supply pipeline is discharged through a plurality of air outlet holes 2211 on the outer periphery of the blowing roller 221; on the one hand, the compressed air discharged from the air outlet holes 2211 is used to blow away the soil falling into the dispersion box 22, so as to further improve the dispersibility of the soil; on the other hand, when the blowing roller 221 rotates to the air outlet holes 2211 opposite to the corresponding crushing roller, the compressed air blown out of the air outlet holes 2211 can also be used to blow off the soil adhering to the crushing roller, so as to clean the residual soil on the crushing roller.
[0038] The hot air source is used to supply air to the blowing roller 221, so that the compressed air blown out by the subsequent blowing roller 221 has a certain temperature, which is beneficial to reducing soil moisture and making the soil less likely to clump again; at the same time, the soil can be preheated, which is beneficial to reducing the subsequent heating power consumption of the rotary kiln on the soil.
[0039] Reference Figure 4 and Figure 5, a plurality of air nozzles 2212 are arranged on the outer circumference of the air blowing roller 221 corresponding to the plurality of air outlet holes 2211, and the air nozzles 2212 are connected to the outer circumference of the air blowing roller 221 and communicate with the corresponding air outlet holes 2211. The air nozzles 2212 are arranged in a flat shape at one end away from the air blowing roller 221. Through the arrangement of the air nozzles 2212, on the one hand, the compressed air discharged from the air outlet holes 2211 acts more concentratedly on the soil, which is conducive to improving the blowing effect of the compressed air on the soil. On the other hand, the air blowing roller 221 can hit the soil through the air nozzles 2212 during the rotation process, which is conducive to further improving the dispersion of the soil.
[0040] Reference Figure 2 and Figure 4 The dispersion part also includes a plurality of impact rods 223 supported in the inner cavity of the dispersion box 22, and the plurality of impact rods 223 are all located below the two blowing rollers 221; in the present embodiment, the impact rods 223 are all made of aluminum alloy bars. The axial direction of the impact rod 223 is arranged parallel to the axial direction of the blowing roller 221. One end of the impact rod 223 is rotatably arranged in the dispersion box 22 through a bearing. A plurality of second rotary drive members 224 are arranged on the outside of the dispersion box 22 corresponding to the plurality of impact rods 223, and the second rotary drive member 224 is connected to the driving of the corresponding impact rod 223 to drive the corresponding impact rod 223 to rotate. Specifically, the second rotary drive member 224 is a reduction motor.
[0041] By setting the impact rod 223 and the second rotary driving member 224, the second rotary driving member 224 is used to drive the impact rod 223 to rotate, and the rotating impact rod 223 is used to hit the falling soil in the subsequent dispersion box 22, which is conducive to better dispersing the agglomerated soil. At the same time, the rotation of the impact rod 223 can be used to buffer the impact of the continuously falling soil on the impact rod 223, thereby reducing the damage of the impact rod 223 due to long-term impact of the soil.
[0042] Reference Figure 2 and Figure 6 A feed hopper 231 is vertically installed at the feed port of the screw conveyor 23, and the feed hopper 231 is connected to the dispersion box 22. The setting of the feed hopper 231 is conducive to concentrating and guiding the soil falling from the subsequent dispersion box 22 into the screw conveyor 23.
[0043] Two air blowing knives 232 are also arranged in the feeding funnel 231. Both air blowing knives 232 are installed on the top of the feeding funnel 231 and are respectively located below two air blowing rollers. The air outlets of the air blowing knives 232 are arranged toward the inner cavity of the screw conveyor 23. Both air blowing knives 232 are connected to the hot air source. Subsequently, compressed air is continuously introduced into the two air blowing knives 232 through a hot air source, so that the two air blowing knives 232 can continuously blow compressed air downward. On the one hand, the soil adhering to the feed hopper 231 and the feed port of the screw conveyor 23 can be blown into the screw conveyor 23, thereby reducing the situation where the soil in the feed hopper 231 is not smoothly flowing due to soil accumulation. On the other hand, the compressed air blown out by the two air blowing knives 232 can further disperse and dry the soil in the screw conveyor 23, so that the soil can be better conveyed to the rotary kiln body 1 in a dispersed state via the screw conveyor 23.
[0044] Reference Figures 2 to 6 The connection between the dispersion box 22 and the double-roll crusher 21 and the connection between the dispersion box 22 and the feeding funnel 231 are connected by a sealing connection structure. Specifically, the sealing connection structure includes a flange 3. The flanges 3 at each connection are abutted against each other and fixed by bolts and nuts. The above arrangement is conducive to improving the sealing of the connection between the dispersion box 22 and the double-roll crusher 21 and the connection between the dispersion box 22 and the feeding funnel 231, so that the soil can flow in a relatively closed space, reducing the subsequent leakage of the soil in the process of flowing through the double-roll crusher 21, the dispersion box 22 and the feeding funnel 231.
[0045] The implementation principle of the embodiment of the present application is as follows: the soil to be treated is placed into a double-roll crusher 21, and the soil is crushed and dispersed by the double-roll crusher 21; the soil treated by the double-roll crusher 21 falls into a dispersion box 22, and after being blown away by compressed air sprayed from a plurality of nozzles on the periphery of a blowing roller 221 rotating in the dispersion box 22, the soil continues to fall and contacts a plurality of rotating impact rods 223 at the bottom of the dispersion box 22, and the rotating impact rods 223 are used to drive the soil to be further dispersed; finally, the soil falls into a screw conveyor 23 through a feeding funnel 231, and is then transported to the rotary kiln body 1 via the screw conveyor 23, thereby effectively reducing the amount of soil agglomerates directly entering the rotary kiln body 1, and facilitating the subsequent rotary kiln to heat the soil to be treated more evenly to separate the organic pollutants carried in the soil.
[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A contaminated soil remediation thermal desorption device, characterized by: It comprises a rotary kiln body (1) and a dispersing and conveying mechanism (2); The dispersion and conveying mechanism (2) comprises a primary dispersion component, a secondary dispersion component and a feed conveying component; The primary dispersing assembly comprises a double-roll crusher (21); The secondary dispersion assembly comprises a dispersion box (22), the dispersion box (22) is located at the bottom of the double-roll crusher (21), and the dispersion box (22) is connected to the double-roll crusher (21); a dispersion part for dispersing soil is arranged in the dispersion box (22); The feed conveying assembly comprises a screw conveyor (23), and the screw conveyor (23) is located at the bottom of the dispersion box (22); a feed funnel (231) is provided at the feed port of the screw conveyor (23), and the feed funnel (231) is connected to the dispersion box (22); and the discharge port of the screw conveyor (23) is connected to the feed end of the rotary kiln body (1).
2. A contaminated soil remediation thermal desorption device according to claim 1, characterized in that: The dispersion section comprises a plurality of blowing rollers (221) supported in the dispersion box (22), an air supply pipeline being provided in the blowing rollers (221), and a plurality of air outlet holes (2211) being provided around the outer periphery of the blowing rollers (221), and the air outlet holes (2211) are all connected to the air supply pipeline.
3. A contaminated soil remediation thermal desorption device according to claim 2, characterized in that: Both ends of the blowing roller (221) are rotatably connected in the dispersion box (22); the dispersion box (22) is provided with a first rotary driving member (222) corresponding to the blowing roller (221); the first rotary driving member (222) is drivably connected to the blowing roller (221) and is used to drive the blowing roller (221) to rotate.
4. A contaminated soil remediation thermal desorption device according to claim 3, characterized in that: A plurality of air nozzles (2212) are connected to the outer circumference of the air blowing roller (221) corresponding to the plurality of air outlet holes (2211), and the air nozzles (2212) are connected to the corresponding air outlet holes (2211).
5. The contaminated soil remediation thermal desorption device according to claim 2, characterized in that: The dispersion section also includes a plurality of impact rods (223) horizontally supported in the dispersion box (22), wherein the impact rods (223) are located below the blowing roller (221); a plurality of second rotary driving members (224) are provided in the dispersion box (22) corresponding to the plurality of impact rods (223), and the second rotary driving members (224) are drivingly connected to the corresponding impact rods (223) for driving the corresponding impact rods (223) to rotate.
6. A contaminated soil remediation thermal desorption device according to claim 2, characterized in that: A plurality of air blowing knives (232) are arranged inside the feed hopper (231), and the air outlets of the air blowing knives (232) are all arranged toward the inner cavity of the screw conveyor (23).
7. A contaminated soil remediation thermal desorption device according to claim 6, characterized in that: The blowing roller (221) and the blowing air knife (232) are both connected to a hot air source.
8. The contaminated soil remediation thermal desorption device according to claim 1, characterized in that: The connection between the double-roll crusher (21) and the dispersion box (22) and the connection between the dispersion box (22) and the feed hopper (231) are both connected via a sealed connection structure.