Movable polluted soil thermal desorption particle size strengthening feeding system
By designing a movable thermal desorption particle size strengthening loading system for contaminated soil, through multi-stage screening and iron removal treatment, the problem of restricting the thermal conduction efficiency of soil particle size is solved, significantly improving the efficiency and repair effect of thermal desorption equipment, and achieving cost reduction and efficiency increase.
Patent Information
- Application Number
- CN202420462024.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-11
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2034-03-11
AI Technical Summary
The existing soil thermal desorption feed system has low repair efficiency, and the soil often has unqualified conditions after repair, mainly due to the constraints of the soil particle size on the heat conduction efficiency.
A movable thermal desorption particle size strengthening feeding system for contaminated soil is designed, including a primary screening device, an iron removal device, a secondary screening device and a conveying device. Through multi-stage screening and iron removal treatment, the soil particle size is reduced and the particle uniformity is improved, thereby improving the heat conduction efficiency and thermal desorption efficiency.
It significantly improves the thermal conduction efficiency and thermal desorption efficiency of thermal desorption equipment, improves the soil repair efficiency and repair effect, and achieves cost reduction and efficiency improvement.
Smart Images
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Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of thermal desorption and restoration of contaminated soil, and in particular relates to a movable contaminated soil thermal desorption particle size enhanced feeding system. Background Art
[0002] The current remediation technologies for soils in organic contaminated sites mainly include thermal desorption (thermal desorption), chemical oxidation, gas phase extraction, leaching, microbial remediation and phytoremediation. Among them, thermal desorption technology has the advantages of strong universality, movable equipment, short processing time, high removal efficiency, reusable soil after repair, no secondary pollution and high public acceptance. However, the actual physical and chemical properties of the soil have a great influence on the thermal desorption process and results. The soil particle size restricts the thermal conduction efficiency of the soil particles, which in turn affects the thermal desorption efficiency. Generally speaking, small soil particles heat up faster than large soil particles, especially when the thermal desorption rate-controlling mass transfer mechanism is intra-particle diffusion, so the pollutant removal rate in small soil particles is higher.
[0003] The existing soil thermal desorption feeding system generally pre-treats the soil through the ALLU DC3-23 X75 equipment, and then directly feeds the soil into the thermal desorption equipment for remediation. Although it can meet the feeding requirements of the thermal desorption equipment, the remediation efficiency is low, and the soil is often unqualified after remediation. Utility Model Content
[0004] In order to overcome the deficiencies of the above-mentioned prior art, the purpose of the utility model is to provide a movable contaminated soil thermal desorption particle size enhanced feeding system, which can significantly improve the thermal conduction efficiency and thermal desorption efficiency of the thermal desorption equipment, thereby achieving cost reduction and efficiency improvement.
[0005] To achieve the above-mentioned purpose, the technical solution of the utility model is a movable contaminated soil thermal desorption particle size enhanced feeding system, comprising a flatbed truck and a primary screening device, an iron removal device, a secondary screening device and a conveying device which are sequentially arranged on the flatbed truck according to the process; the secondary screening device comprises a vibrating screen, the vibrating screen comprises a vibrating screen mesh, a soil cutter is arranged below the vibrating screen mesh, and a rotary hammer is arranged between the vibrating screen and the conveying device.
[0006] As one of the embodiments, the primary screening device includes a feed hopper, a first roller screen and a second roller screen, the discharge port of the feed hopper is located above the feed port of the first roller screen, the discharge port of the first roller screen is located above the feed port of the second roller screen, and the discharge port of the second roller screen is located above the feed port of the iron removal device.
[0007] As one of the implementation modes, the sieve plate of the first-stage roller screen and the sieve plate of the second-stage roller screen are both arranged tilted, and the angle between them and the horizontal plane is 25-35°.
[0008] As one of the implementation modes, the iron removal device includes a self-unloading iron remover and a first belt conveyor, and the self-unloading iron remover is arranged above the first belt conveyor.
[0009] As one of the implementation modes, the first belt conveyor is tilted upward in a direction from the primary screening device to the secondary screening device, and the tilt angle is 25 to 35 degrees.
[0010] As one of the implementation modes, the vibrating screen is tilted downward from the iron removal device to the conveying device, and the tilt angle is 25 to 35 degrees.
[0011] As one of the implementation modes, the mesh size of the vibrating screen is (20-40) mm×(20-40) mm.
[0012] As one of the implementation modes, the secondary screening device further includes a drum screen, and the drum screen is arranged between the vibrating screen and the conveying device.
[0013] As one of the implementation modes, the mesh size of the drum screen is (8-10) mm×(8-10) mm.
[0014] As one of the implementation modes, the conveying device includes a metering belt scale and a second belt conveyor, and the metering belt scale is arranged at the discharge end of the second belt conveyor.
[0015] Compared with the prior art, the utility model has the following beneficial effects:
[0016] (1) The mobile contaminated soil thermal desorption particle size enhanced feeding system provided by the utility model is used to treat the pretreated contaminated soil. First, the construction slag and a small amount of soil pellets in the pretreated contaminated soil are removed by a primary screening device, and then the iron in the soil is removed by an iron removal device. Then, the construction slag and a small amount of soil pellets are further removed by a vibrating screen of a secondary screening device. Then, the soil particle size entering the thermal desorption system is further reduced by a soil cutter and a rotary hammer, thereby improving the uniformity of soil particles, thereby improving the heat conduction efficiency and thermal desorption efficiency, and improving the soil remediation efficiency and remediation effect;
[0017] (2) The utility model integrates a primary screening device, an iron removal device, a secondary screening device and a conveying device on a flatbed vehicle, which is convenient for moving from one working point to another, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0019] Figure 1 A schematic diagram of the structure of a movable contaminated soil thermal desorption particle size enhanced feeding system provided by an embodiment of the utility model;
[0020] In the figure: 1. Feed hopper; 2. First-stage roller screen; 3. Second-stage roller screen; 4. First belt conveyor; 5. Self-unloading iron remover; 6. Vibrating screen; 7. Soil cutter; 8. Drum screen; 9. Rotary hammer; 10. Flatbed car. DETAILED DESCRIPTION
[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0022] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.
[0023] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present utility model, unless otherwise specified, "plurality" means two or more.
[0024] like Figure 1As shown, the utility model provides a movable contaminated soil thermal desorption particle size enhanced feeding system, including a flatbed truck 10 and a primary screening device, an iron removal device, a secondary screening device and a conveying device arranged on the flatbed truck 10 in sequence according to the process; the secondary screening device includes a vibrating screen 6, the vibrating screen 6 includes a vibrating screen mesh, a soil cutter 7 is arranged below the vibrating screen mesh, and a rotary hammer 9 is arranged between the vibrating screen 6 and the conveying device. In this embodiment, the construction slag and a small amount of soil pellets in the contaminated soil after pretreatment are first removed by a primary screening device, and then the ironware in the soil is removed by an iron removal device. Then, the construction slag and a small amount of soil pellets are further removed by the vibrating screen 6 of the secondary screening device. Then, the soil cutter 7 and the rotary hammer 9 are used to further reduce the soil particle size entering the thermal desorption system, thereby improving the uniformity of soil particles, thereby improving the heat conduction efficiency and thermal desorption efficiency, and improving the soil remediation efficiency and remediation effect. In this embodiment, the primary screening device, the iron removal device, the secondary screening device and the conveying device are integrated on the flatbed vehicle 10, which is convenient for moving from one work point to another, thereby improving work efficiency.
[0025] Among them, the shell of the vibrating screen 6 is fixed on the flatbed truck 10 through a frame, and the vibrating screen and the soil cutter 7 are arranged in the shell from top to bottom in sequence; and the shell is also provided with a feed port and a discharge port, the feed port of the shell is located above the vibrating screen and below the discharge port of the iron removal device, and the discharge port of the shell is located above the feed port of the rotary hammer 9.
[0026] To refine the above embodiment, the primary screening device includes a feed hopper 1, a primary roller screen 2 and a secondary roller screen 3. The discharge port of the feed hopper 1 is located above the feed port of the primary roller screen 2, the discharge port of the primary roller screen 2 is located above the feed port of the secondary roller screen 3, and the discharge port of the secondary roller screen 3 is located above the feed port of the iron removal device. Among them, the feed hopper 1, the primary roller screen 2 and the secondary roller screen 3 can be fixed on the flatbed car 10 through a frame respectively; the top of the feed hopper 1 is an open type, and the feeding speed is 40 to 50 m / s. 3 / h is appropriate.
[0027] Furthermore, the sieve plate of the primary roller screen 2 and the sieve plate of the secondary roller screen 3 are both inclined, and the angle between them and the horizontal plane is 25-35 degrees, so as to ensure that the material does not slide.
[0028] In this embodiment, the feed hopper 1 is used to feed slag with a particle size less than or equal to 200 mm (which can be slag screened by ALLU DC3-23 X75 equipment pre-treatment screening). After screening by the first-level roller screen 2, slag with a particle size less than or equal to 100 mm can be obtained. After screening by the second-level roller screen 3, soil with a particle size less than or equal to 50 mm can be obtained. The first-level roller screen 2 and the second-level roller screen 3 are used to remove slag larger than 50 mm and a small amount of soil balls.
[0029] To refine the above embodiment, the iron removal device includes a self-unloading iron remover 5 and a first belt conveyor 4, and the self-unloading iron remover 5 is arranged above the first belt conveyor 4. The first belt conveyor 4 and the self-unloading iron remover 5 are respectively fixed on the flatbed vehicle 10 through a frame, and the self-unloading iron remover 5 is located above the discharge end of the first belt conveyor 4, which can remove iron objects in the contaminated soil to avoid blocking and damage to the thermal desorption equipment.
[0030] Preferably, the first belt conveyor 4 is tilted upward from the primary screening device to the secondary screening device, and the tilt angle is 25-35 degrees. The soil processed by the primary screening device is lifted to the vibrating screen 6 by the first belt conveyor 4, while ensuring that the material does not slide.
[0031] Optimally, the vibrating screen is tilted downward from the iron removal device to the conveying device, and the tilt angle is 25-35°. The bottom surface of the housing of the vibrating screen 6 is also tilted downward from the feed end to the discharge end to facilitate discharge.
[0032] Furthermore, the mesh size of the vibration screen is (20-40) mm×(20-40) mm. Preferably, after screening by the vibration screen of the vibration screen 6, soil with a particle size of less than or equal to 30 mm can be obtained.
[0033] The above embodiment is optimized, and the secondary screening device further includes a drum screen 8, and the drum screen 8 is arranged between the vibrating screen 6 and the conveying device. The rotary hammer 9 is arranged above the drum screen 8, and the discharge port of the rotary hammer 9 is connected to the feed port of the drum screen 8. The drum screen 8 can further screen the soil screened by the vibrating screen 6 and processed by the cutter 7 and the rotary hammer 9, further reduce the soil particle size entering the thermal desorption system, and improve the heat conduction efficiency and thermal desorption efficiency.
[0034] Furthermore, the mesh size of the drum screen 8 is (8-10) mm×(8-10) mm. Preferably, after screening by the drum screen 8, soil with a particle size of less than or equal to 10 mm can be obtained.
[0035] In this embodiment, the mesh shapes of the vibrating screen 6 and the drum screen 8 can be rectangular or square. The effective screen area and the chance of mineral particles passing through the mesh of the screen with different mesh shapes are also different. Under the same mesh size, the effective area of the screen with rectangular mesh is greater than the effective area of the screen with square mesh. In one embodiment, the mesh shape of the vibrating screen 6 is rectangular, and most of the slag is separated from the screen after being screened by the vibrating screen 6. The mesh shape of the drum screen 8 is square, and a small amount of slag is separated from the screen after being screened by the drum screen 8.
[0036] To refine the above embodiment, the conveying device includes a metering belt scale and a second belt conveyor, and the metering belt scale is arranged at the discharge end of the second belt conveyor. In this embodiment, the metering belt scale is installed at the discharge end of the second belt conveyor, which can truly measure the amount of thermal desorption feed repair and disposal engineering.
[0037] All equipment in this embodiment are made of high-strength steel, and the equipment driving devices are all completed by electric-driven explosion-proof motors; the lengths of the primary roller screen 2, the secondary roller screen 3, the vibrating screen 6, and the drum screen 8 are 1.5m, 3.0m, 3.0m, and 3.0m respectively; the primary roller screen 2, the secondary roller screen 3, the iron removal device, the secondary screening device, the drum screen 8, and the conveying device are not fixedly connected, and a certain range of movement is reserved so as not to affect the normal amplitude of the vibration cleaning.
[0038] Embodiment 1
[0039] The mobile contaminated soil thermal desorption particle size enhanced feeding system of the utility model is used to treat the contaminated soil and then transport it to the thermal desorption equipment. The process is as follows:
[0040] First, use a forklift or excavator to transport the ALLU DC3-23 The X75 equipment pre-treatment screening screened slag is put into the feed hopper 1, and the slag enters the first-level roller screen 2 and the second-level roller screen 3 in turn. After screening by the first-level roller screen 2, slag with a particle size of less than or equal to 100 mm can be obtained, and after screening by the second-level roller screen 3, soil with a particle size of less than or equal to 50 mm can be obtained. The slag on the screen and a small amount of soil balls enter the corresponding disposal process, and the contaminated soil under the screen falls on the first belt conveyor 4, and enters the vibrating screen 6 after the iron is removed by the self-unloading iron remover 5; after screening by the vibrating screen of the vibrating screen 6, soil with a particle size of less than or equal to 30 mm can be obtained. The slag on the screen of this process and a small amount of soil balls enter the corresponding disposal process, and the contaminated soil under the screen is processed by the soil cutter 7 + rotary hammer 9 and enters the drum screen 8; after screening by the drum screen 8, soil with a particle size of less than or equal to 10 mm can be obtained, which is sent to the thermal desorption equipment through the conveying device, and the metering belt scale truly measures the thermal desorption feed remediation and disposal engineering quantity; the material on the drum screen 8 is returned to the vibrating screen 6 through the conveying system.
[0041] After being processed by the feeding system of the utility model, the particle size of the polluted soil is less than 10mm and there is no construction slag and ironware larger than 10mm, which can significantly improve the efficiency of heat conduction and thermal desorption, is friendly to the subsequent thermal desorption equipment without damage, and greatly improves the repair effect, achieving cost reduction and efficiency improvement. The weighing quantity of the measuring belt scale is objective and fair, which makes both parties A and B convinced.
[0042] Embodiment 2
[0043] In a soil remediation project involving contaminated soil from a pesticide factory in Wuhan, the contaminant was hexachlorobenzene with a concentration of 5-6 mg / kg. The contaminated soil was directly fed into the thermal desorption equipment after pre-treatment, crushing and screening using ALLU DC3-23 X75. After sampling and testing, some of the soil after remediation was found to be unqualified, and there was obvious construction residue in the soil after remediation.
[0044] The contaminated soil after pre-treatment, crushing and screening by ALLU DC3-23 X75 is treated by the movable contaminated soil thermal desorption particle size enhanced feeding system of the utility model and then fed to the thermal desorption equipment. Since the particle size of the contaminated soil is significantly reduced, the soil after repair is qualified after sampling and testing, and there is no construction residue in the soil after repair.
[0045]
[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A mobile contaminated soil thermal desorption particle size enhanced feeding system, characterized by: It includes a flatbed truck and a primary screening device, an iron removal device, a secondary screening device and a conveying device which are arranged on the flatbed truck in sequence according to the working procedures; the secondary screening device includes a vibrating screen, the vibrating screen includes a vibrating screen mesh, a soil cutter is arranged below the vibrating screen mesh, and a rotary hammer is arranged between the vibrating screen and the conveying device.
2. The movable contaminated soil thermal desorption particle size enhancement feeding system according to claim 1, characterized in that: The primary screening device includes a feed hopper, a first-level roller screen and a second-level roller screen. The discharge port of the feed hopper is located above the feed port of the first-level roller screen, the discharge port of the first-level roller screen is located above the feed port of the second-level roller screen, and the discharge port of the second-level roller screen is located above the feed port of the iron removal device.
3. The movable contaminated soil thermal desorption particle size enhancement feeding system according to claim 2, characterized in that: The sieve plate of the first-stage roller screen and the sieve plate of the second-stage roller screen are both arranged tilted, and the angle between them and the horizontal plane is 25-35 degrees.
4. The movable contaminated soil thermal desorption particle size enhancement feeding system according to claim 1, characterized in that: The iron removal device comprises a self-unloading iron remover and a first belt conveyor, and the self-unloading iron remover is arranged above the first belt conveyor.
5. The movable contaminated soil thermal desorption particle size enhancement feeding system according to claim 4, characterized in that: The first belt conveyor is arranged to be tilted upward in a direction from the primary screening device to the secondary screening device, and the tilt angle is 25 to 35 degrees.
6. The movable contaminated soil thermal desorption particle size enhancement feeding system according to claim 1, characterized in that: The vibrating screen is tilted downward from the iron removal device to the conveying device, and the tilt angle is 25 to 35 degrees.
7. The movable contaminated soil thermal desorption particle size enhancement feeding system according to claim 1, characterized in that: The mesh size of the vibrating screen is (20-40) mm×(20-40) mm.
8. The movable contaminated soil thermal desorption particle size enhancement feeding system according to claim 1, characterized in that: The secondary screening device further comprises a drum screen, and the drum screen is arranged between the vibrating screen and the conveying device.
9. The movable contaminated soil thermal desorption particle size enhancement feeding system according to claim 8, characterized in that: The mesh size of the drum screen is (8-10) mm×(8-10) mm.
10. The movable contaminated soil thermal desorption particle size enhancement feeding system according to claim 1, characterized in that: The conveying device comprises a metering belt scale and a second belt conveyor, wherein the metering belt scale is arranged at a discharging end of the second belt conveyor.