CN210172180U - Two-stage combined self-cleaning spiral thermal desorption device for organic contaminated soil - Google Patents
Two-stage combined self-cleaning spiral thermal desorption device for organic contaminated soil Download PDFInfo
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- CN210172180U CN210172180U CN201920802933.0U CN201920802933U CN210172180U CN 210172180 U CN210172180 U CN 210172180U CN 201920802933 U CN201920802933 U CN 201920802933U CN 210172180 U CN210172180 U CN 210172180U
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- 238000003795 desorption Methods 0.000 title claims abstract description 75
- 239000002689 soil Substances 0.000 title claims abstract description 35
- 238000004140 cleaning Methods 0.000 title claims abstract description 23
- 238000002485 combustion reaction Methods 0.000 claims abstract description 5
- 238000012545 processing Methods 0.000 claims abstract description 4
- 239000000725 suspension Substances 0.000 claims description 15
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 3
- 239000010962 carbon steel Substances 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 239000012855 volatile organic compound Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000009835 boiling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 150000002894 organic compounds Chemical class 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 230000002085 persistent effect Effects 0.000 description 2
- 239000000575 pesticide Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000035558 fertility Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Abstract
The utility model discloses a two-stage combination formula automatically cleaning spiral organic contaminated soil thermal desorption device belongs to contaminated site soil restoration technical field. The device is including consecutive feed arrangement, first order thermal desorption device, interstage blanking linkage segment, second level thermal desorption device, and first order thermal desorption device and second level thermal desorption device's outer wall is equipped with the well plenum chamber of intercommunication each other, and the one end of cavity links to each other with the combustion chamber that is equipped with the combustor, and the other end is connected with tail gas processing system, and first order thermal desorption device adopts shaftless spiral, and second level thermal desorption device adopts there is the axle spiral. According to technical scheme select two-stage spiral combination mode, match thermal desorption spiral key parameter and have self-cleaning function's shaftless spiral thermal desorption device, can reduce and reduce thermal desorption device trouble, raise the efficiency.
Description
Technical Field
The utility model belongs to the technical field of pollute place soil restoration, be applicable to the restoration of organic contaminated place soil, concretely relates to two-stage automatically cleaning spiral thermal desorption device.
Background
The soil is a loose surface layer which has fertility and can grow plants on the surface of the land, when harmful substances discharged into the soil exceed the self-cleaning capacity of the soil, the composition, the structure and the function of the soil are changed, the activity of microorganisms is inhibited, the harmful substances or decomposition products thereof are gradually accumulated in the soil and absorbed by the human body through the soil → the plants → the human body or through the soil → water → the human body indirectly, and the soil pollution is generated to the extent of harming the health of the human body.
The current seriously polluted sites mainly comprise chemical plants, pesticide plants, smelting plants, gas stations, chemical storage tanks and the like, the pollutants of the sites mainly comprise organic pollution, and the sites can be divided into volatile organic compounds, semi-volatile organic compounds, persistent organic compounds, pesticides and the like according to the difference of the melting boiling points of the volatile organic compounds, the semi-volatile organic compounds, the persistent organic compounds and the like. The polluted soil restoration technology comprises incineration (cement kiln cooperative treatment), phytoremediation, bioremediation, chemical remediation, thermal desorption and the like, wherein the thermal desorption technology has the advantages of high treatment efficiency, short restoration period, movable device and the like, is widely applied to restoration of volatile/semi-volatile organic polluted sites, and is one of the main site restoration technologies, wherein the thermal desorption accounts for 20-30% in European and American site restoration cases, as shown by American EPA statistics.
The thermal desorption technology is that the excavated polluted soil is heated to a boiling point of a target pollutant through direct or indirect heating, and the pollutant is gasified and volatilized selectively by controlling the system temperature and the material retention time, so that the target pollutant is separated and removed from soil particles. The indirect thermal desorption system is widely applied due to the advantages of compact structure, easy realization of blocking prying, convenient transportation and the like. Most of the existing thermal desorption devices adopt a spiral conveying device as a core reactor, and the spiral conveying device is divided into a shaft spiral and a shaftless spiral.
For example, patent publication No. CN207592424U discloses a multistage countercurrent thermal desorption device structure, in which a spiral partition plate surrounding an extraction pipe is arranged between a desorption chamber and the extraction pipe, and hot flue gas generated by a burner is firstly consistent with the advance direction of contaminated soil and then is opposite to the advance direction of the contaminated soil. Its purpose is to improve heat exchange efficiency, prevents the extraction tube upwarp deformation. Patent publication No. CN104785515B discloses a two-stage indirect thermal desorption device, which comprises an upper thermal desorption chamber and a lower thermal desorption chamber, wherein a first packing auger and a second packing auger are arranged in the upper thermal desorption chamber and the lower thermal desorption chamber.
The spiral is used as a core component of the thermal desorption device, and the matching of parameters such as the diameter, the length, the pitch, the rotating speed and the like of the spiral is very critical. If the diameter of the spiral is too small or the pitch of the spiral is too small, the probability that the spiral is blocked by soil is greatly increased; the diameter of the spiral is too large, the thermal desorption heat transfer area is low on the same scale, and the efficiency is not high; if the screw pitch is too large, the ratio of the length to the diameter is too small or the rotating speed is too high, the heating time is short, and the thermal desorption effect is poor; if the ratio of the length to the diameter is too large or the rotating speed is too slow, the spiral conveying capacity is too low, the heating process is too long, and the treatment capacity of the thermal desorption device is reduced. The prior art only discloses a basic structure of a two-section type indirect thermal desorption device, does not provide an optimal scheme of spiral classification combination, does not provide a spiral parameter matching relation, and is difficult to realize optimal operation.
In addition, the existing screw conveyor does not have a self-cleaning function, soil with large viscosity is easy to adhere to the surface of the screw blade, so that the problems of conveying is not smooth, conveying capacity is reduced, blockage is caused, thermal desorption efficiency is reduced and the like are caused.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the defect to prior art existence provides a two-stage combination formula automatically cleaning spiral organic contaminated soil thermal desorption device.
The purpose of the utility model can be realized by the following technical scheme:
the utility model provides a two-stage combination formula automatically cleaning spiral organic contaminated soil thermal desorption device, the device is including consecutive feed arrangement, first order thermal desorption device, interstage blanking linkage segment, second level thermal desorption device, first order thermal desorption device and second level thermal desorption device's outer wall is equipped with the well plenum chamber that communicates mutually, the one end of cavity links to each other with the combustion chamber that is equipped with the combustor, the other end is connected with tail gas processing system, first order thermal desorption device adopts shaftless spiral, second level thermal desorption device adopts there is the axle spiral.
Further: the first-stage thermal desorption device is provided with a shaftless spiral, the diameter of the spiral is 200-800 mm, the length of the spiral is 15-25 times of the diameter, the pitch of the spiral is 0.25-0.5 times of the diameter, and the rotating speed is 2-6 r/min.
Further: the second-stage thermal desorption device is provided with a shaft spiral, the diameter of the spiral is 200-800 mm, the length of the spiral is 15-25 times of the diameter, the pitch of the spiral is 0.25-0.5 times of the diameter, and the rotating speed is 2-6 r/min.
Further: and a chain a is suspended on the shaftless spiral.
Further: the chain a is symmetrically suspended and connected on the inner edge surface of the middle hole of the helical blade, the suspension depth is lower than the height of the blade by more than 2cm, and the preferred suspension connection mode is welding.
Further: and a chain b is hung on the shaft screw.
Further: the chain b is connected to the side face of the helical blade in a three-point equal suspension mode, the suspension depth is lower than the height of the blade by more than 2cm, and the suspension connection mode is preferably welded.
Further: the chain a and the chain b are made of carbon steel or stainless steel, 8-grade short-chain chains for common precision hoisting are recommended to be used according to the specifications of the chains, and the pitch is 0.1-0.15 times of the diameter of the spiral.
The utility model has the advantages that:
according to technical scheme select two-stage spiral combination mode, match thermal desorption spiral key parameter and have self-cleaning function's shaftless spiral thermal desorption device, can reduce and reduce thermal desorption device trouble, raise the efficiency.
The shaftless spiral has certain anti-blocking capability and is suitable for conveying materials with large viscosity. When the two-stage thermal desorption device works, the original soil has high water content and large viscosity, and is easy to adhere to the helical blades, so that the first-stage helical selection is optimal without a shaft; when the soil reaches the second-stage spiral, the water content is reduced, the viscosity is not high, the temperature is rapidly increased, and the strength of the spiral material is reduced, so that the selected shaft spiral with high structural strength is optimal.
Drawings
FIG. 1 is a schematic diagram of a two-stage spiral assembly.
FIG. 2 is a schematic view of the connection mode of the first stage shaftless spiral self-cleaning chain.
Fig. 3 is a schematic diagram of the connection mode of the second-stage spiral self-cleaning chain with a shaft.
Wherein: 1 is feed arrangement, 2 is first order thermal desorption device, 3 is interstage blanking linkage segment, 4 is second level thermal desorption device, 5 is well cavity, 6 is the combustor, 7 is the combustion chamber, 8 is shaftless spiral, 9 is for having the spiral 10 of axle to be chain a, 11 is chain b.
Detailed Description
The following examples are given by way of illustration only, but the scope of the present invention is not limited thereto:
if fig. 1 ~ 3, a two-stage combination formula automatically cleaning spiral organic contaminated soil thermal desorption device, the device is including consecutive feed arrangement (1), first order thermal desorption device (2), interstage blanking linkage segment (3), second level thermal desorption device (4), the outer wall of first order thermal desorption device (2) and second level thermal desorption device (4) is equipped with well cavity (5) that communicate each other, the one end of cavity links to each other with combustion chamber (7) that are equipped with combustor (6), the other end is connected with tail gas processing system, first order thermal desorption device (2) adopt shaftless spiral (8), second level thermal desorption device (4) adopt shaftless spiral (9).
A shaftless spiral (8) is arranged in the first-stage thermal desorption device (2), the diameter of a spiral blade of the shaftless spiral (8) is 200-800 mm, the length of the spiral blade is 15-25 times of the diameter, the pitch of the spiral blade is 0.25-0.5 times of the diameter, and the rotating speed is 2-6 r/min.
The second-stage thermal desorption device (4) is internally provided with a shaft screw (9), the diameter of a screw blade of the shaft screw is 200-800 mm, the length of the screw blade is 15-25 times of the diameter, the screw pitch is 0.25-0.5 times of the diameter, and the rotating speed is 2-6 r/min.
A chain a (10) is hung on the shaftless spiral (8). The chain a (10) is symmetrically suspended and connected on the inner edge surface of the middle hole of the helical blade, the suspension depth is lower than the height of the blade by more than 2cm, and the preferred suspension connection mode is welding.
A chain b (11) is hung on the spiral (9) with the shaft. The chain b (11) is connected to the side face of the helical blade in a three-point equal suspension mode, the suspension depth is lower than the height of the blade by more than 2cm, and the suspension connection mode is preferably welded.
The chain a (10) and the chain b (11) are made of carbon steel or stainless steel, 8-grade short-chain chains for common precision hoisting are recommended to be used according to the chain specification, and the pitch is 0.1-0.15 times of the diameter of the spiral.
Application case 1:
theoretical calculation and engineering test data show that different spiral parameters have the following effects on mean fault free time, heating time and throughput:
application case 2:
engineering test data show that by adopting the shaftless spiral thermal desorption device similar to the technical scheme, when the device is provided with or without a self-cleaning function, the phenomenon that soil is adhered to the surface of a spiral blade occurs, and the average failure-free time statistics is as follows:
Claims (9)
1. the utility model provides a two-stage combination formula automatically cleaning spiral organic contaminated soil thermal desorption device which characterized in that: the device is including consecutive feed arrangement (1), first order thermal desorption device (2), interstage blanking linkage segment (3), second level thermal desorption device (4), the outer wall of first order thermal desorption device (2) and second level thermal desorption device (4) is equipped with well plenum chamber (5) that communicate mutually, the one end of well plenum chamber (5) links to each other with combustion chamber (7) that are equipped with combustor (6), the other end is connected with tail gas processing system, first order thermal desorption device (2) adopt shaftless spiral (8), second level thermal desorption device (4) adopt and have axle spiral (9).
2. The two-stage combined self-cleaning spiral thermal desorption device for organic contaminated soil according to claim 1, wherein: a shaftless spiral (8) is arranged in the first-stage thermal desorption device (2), the diameter of a spiral blade of the shaftless spiral (8) is 200-800 mm, the length of the spiral blade is 15-25 times of the diameter, the pitch of the spiral blade is 0.25-0.5 times of the diameter, and the rotating speed is 2-6 r/min.
3. The two-stage combined self-cleaning spiral thermal desorption device for organic contaminated soil according to claim 1, wherein: the second-stage thermal desorption device (4) is internally provided with a shaft screw (9), the diameter of a screw blade of the shaft screw is 200-800 mm, the length of the screw blade is 15-25 times of the diameter, the screw pitch is 0.25-0.5 times of the diameter, and the rotating speed is 2-6 r/min.
4. The two-stage combined self-cleaning spiral thermal desorption device for organic contaminated soil according to claim 2, wherein: a chain a (10) is hung on the shaftless spiral (8).
5. The two-stage combined self-cleaning spiral thermal desorption device for organically-polluted soil according to claim 4, wherein: the chain a (10) is symmetrically suspended and connected on the inner edge surface of the middle hole of the helical blade, and the suspension depth is lower than the height of the blade by more than 2 cm.
6. The two-stage combined self-cleaning spiral thermal desorption device for organically-polluted soil according to claim 5, wherein: the suspension connection mode is welding.
7. The two-stage combined self-cleaning spiral thermal desorption device for organically-polluted soil according to claim 3, wherein: a chain b (11) is hung on the spiral (9) with the shaft.
8. The two-stage combined self-cleaning spiral thermal desorption device for organically-polluted soil according to claim 7, wherein: the chain b (11) is connected to the side face of the helical blade in a three-point equal suspension mode, the suspension depth is lower than the height of the blade by more than 2cm, and the suspension connection mode is preferably welded.
9. The two-stage combined self-cleaning spiral thermal desorption device for organically-polluted soil according to claim 4 or 7, wherein: the chain a (10) and the chain b (11) are made of carbon steel or stainless steel, 8-grade short-chain chains for common precision hoisting are recommended to be used according to the chain specification, and the pitch is 0.1-0.15 times of the diameter of the spiral.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920802933.0U CN210172180U (en) | 2019-05-30 | 2019-05-30 | Two-stage combined self-cleaning spiral thermal desorption device for organic contaminated soil |
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| CN201920802933.0U CN210172180U (en) | 2019-05-30 | 2019-05-30 | Two-stage combined self-cleaning spiral thermal desorption device for organic contaminated soil |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110227707A (en) * | 2019-05-30 | 2019-09-13 | 南京工业大学 | Two-stage combined self-cleaning spiral thermal desorption device for organic contaminated soil |
| CN111889495A (en) * | 2020-07-14 | 2020-11-06 | 诸暨华匠工程设计咨询有限公司 | Soil remediation thermal desorption equipment and process thereof |
| CN115805231A (en) * | 2022-12-05 | 2023-03-17 | 中国石油大学(北京) | System and method for restoring petroleum-polluted soil |
-
2019
- 2019-05-30 CN CN201920802933.0U patent/CN210172180U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110227707A (en) * | 2019-05-30 | 2019-09-13 | 南京工业大学 | Two-stage combined self-cleaning spiral thermal desorption device for organic contaminated soil |
| CN111889495A (en) * | 2020-07-14 | 2020-11-06 | 诸暨华匠工程设计咨询有限公司 | Soil remediation thermal desorption equipment and process thereof |
| CN115805231A (en) * | 2022-12-05 | 2023-03-17 | 中国石油大学(北京) | System and method for restoring petroleum-polluted soil |
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