CN208583804U - Contaminated soil thermal desorption device - Google Patents
Contaminated soil thermal desorption device Download PDFInfo
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- CN208583804U CN208583804U CN201820686031.0U CN201820686031U CN208583804U CN 208583804 U CN208583804 U CN 208583804U CN 201820686031 U CN201820686031 U CN 201820686031U CN 208583804 U CN208583804 U CN 208583804U
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- thermal desorption
- contaminated soil
- air gun
- heat
- exchange tube
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Abstract
The utility model provides a kind of contaminated soil thermal desorption device, and the oxygen content by reducing reaction atmosphere reduces the generation of dioxin during contaminated soil thermal desorption.The utility model includes thermal desorption rotary kiln and chilling tower；It is characterized by also including nitrogen air accumulator, heat-exchange tube, air gun and divergent nozzles；Nitrogen air accumulator is connected by pipeline with the import of heat-exchange tube, and heat-exchange tube is arranged in chilling tower middle and lower part region；The outlet of heat-exchange tube is connected with air gun, and air gun stretches to the dioxin formation zone in thermal desorption rotary kiln, and divergent nozzle is equipped on air gun, and divergent nozzle is located at the top of contaminated soil in thermal desorption rotary kiln.
Description
Technical field
The utility model relates to a kind of contaminated soil thermal desorption devices.
Background technique
Dioxin is persistence organic pollutant generally existing in a kind of environment, have extremely strong carcinogenic, teratogenesis, cause it is prominent
Denaturation, to the great harm of human health.Dioxin mainly by de novo formation react generate, and the reaction need to have carbon, hydrogen,
Oxygen and chlorine, and could occur under certain temperature action.Raw material needed for contaminated soil contains dioxin de novo formation, therefore
It carries out that dioxin can be generated when thermal desorption in 250-600 DEG C of temperature range, increases dioxin concentration in flue gas and soil, bring
Secondary pollution.
Contaminated soil thermal desorption device is to pass through direct or indirect heat exchange under vacuum conditions or when being passed through carrier gas, will
Organic pollutant in soil is heated to enough temperature, so that organic pollutant is able to volatilize or separate from pollution medium,
Into gas handling system, as shown in the Chinese patent application No. is 201711140822.X.Due to contaminated soil constituent
And thermal desorption temperature can not change, therefore seem especially heavy to the regulation reduction dioxin generation of thermal desorption atmosphere progress part
It wants.Existing research finds that flying dust generates for 300 DEG C for reaction 30 minutes almost without dioxin in a nitrogen atmosphere.When oxygen-containing 10%
Nitrogen is larger by dioxin production quantity when flying dust progress identical experiment, and with the increase dioxin of oxygen content (0-10%)
Production quantity increase.Research also shows that dioxin can be degraded when heating flying dust under nitrogen atmosphere.It follows that oxygen is two evils
The oxygen source of English de novo formation reaction, most important for the de novo formation of dioxin, oxygen content can in reduction reaction atmosphere
Reduce the production quantity of contaminated soil dioxin during thermal desorption.
Utility model content
The purpose of the utility model is to overcome the above deficiencies in the existing technologies, and it is reasonable to provide a kind of design
Contaminated soil thermal desorption device, the oxygen content by reducing reaction atmosphere reduce dioxin during contaminated soil thermal desorption
Generation.
The technical scheme in the invention for solving the above technical problem is: a kind of contaminated soil thermal desorption device, including
Thermal desorption rotary kiln and chilling tower；It is characterized by also including nitrogen air accumulator, heat-exchange tube, air gun and divergent nozzles；Nitrogen
Air accumulator is connected by pipeline with the import of heat-exchange tube, and heat-exchange tube is arranged in chilling tower middle and lower part region；Heat-exchange tube
Outlet is connected with air gun, and air gun stretches to the dioxin formation zone in thermal desorption rotary kiln, is equipped with divergent nozzle on air gun,
Divergent nozzle is located at the top of contaminated soil in thermal desorption rotary kiln.
Nitrogen air accumulator described in the utility model is provided with gas flow control valve and flow measurement device.
Air gun described in the utility model is furnished with temperature measuring device.
Divergent nozzle described in the utility model and contaminated soil are in the vertical direction at a distance of 5-10cm.
Several branches are separated at the top of air gun described in the utility model, every branch road is respectively arranged with divergent nozzle.
Every branch described in the utility model is 20-40cm at a distance of 20-40cm, the spacing of the nozzle of same branch.
Thermal insulation material is surrounded by outside air gun described in the utility model.
Air gun described in the utility model is not rotated with thermal desorption rotary kiln and is rotated.
The utility model compared with prior art, has the following advantages that and effect:
(1), the utility model can not only reduce the dioxin into tail flue gas purification system, and it is de- can also to reduce heat
Dioxin in attached cleaning soil；
(2), the utility model can in thermal desorption, required temperature determines that air gun enters the amount of protruding into of kiln according to contaminated soil,
The nitrogen of penetrating is easy the region that the entire dioxin of covering generates；
(3), nitrogen be heated to the temperature close of contaminated soil in rotary kiln and straying quatity it is less, to thermal desorption device
Temperature influence on system operation it is smaller；
(4), the utility model is compact-sized, connection and reasonable arrangement, easy to operate, effectively reduces contaminated soil in thermal desorption
The production quantity of dioxin in the process.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model embodiment.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawing and by embodiment, and following embodiment is pair
The explanation of the utility model and the utility model is not limited to following embodiment.
Referring to Fig. 1, a kind of contaminated soil thermal desorption device, including thermal desorption rotary kiln 1, cyclone separator 2, dual firing chamber 3,
Chilling tower 4, bag filter 5, eluting column 6, nitrogen air accumulator 8, heat-exchange tube 9, air gun 10 and divergent nozzle 11.
Thermal desorption rotary kiln 1, cyclone separator 2, dual firing chamber 3, chilling tower 4, bag filter 5, eluting column 6 successively connect
It connects.
Nitrogen air accumulator 8 is provided with gas flow control valve and flow measurement device, can adjust well into kiln nitrogen
Flow.Nitrogen air accumulator 8 is connected by pipeline with the import of heat-exchange tube 9.
4 middle and lower part region of chilling tower (regional temperature is 200-400 DEG C), heat-exchange tube 9 goes out the setting of heat-exchange tube 9
Mouth is connected with air gun 10.
Air gun 10 is furnished with temperature measuring device, adjusts nitrogen flow according to the temperature value of feedback, guarantees the temperature into kiln nitrogen
Degree maintains near contaminated soil thermal desorption required temperature.Air gun 10 stretches to dioxin formation zone in thermal desorption rotary kiln 1
(regional temperature be 250 DEG C or more) is equipped with divergent nozzle 11 on air gun 10, and divergent nozzle 11 is located at thermal desorption rotary kiln 1
The top of interior contaminated soil 7, with contaminated soil 7 in the vertical direction at a distance of 5-10 cm.3 branches are separated at the top of air gun 10, often
Branch is at a distance of 20-40cm.Every branch road of air gun 10 is respectively arranged with divergent nozzle 11, and the spacing of the nozzle 11 of same branch is
20-40cm.Thermal insulation material is surrounded by outside air gun 10.Air gun 10 is not rotated with thermal desorption rotary kiln 1 and is rotated, and is farthest mentioned
The contact area of high nitrogen and contaminated soil.
A kind of method that above-mentioned contaminated soil thermal desorption device reduces dioxin generation, comprises the following processes:
(1), the nitrogen that nitrogen air accumulator 8 provides enters heat-exchange tube 9, is returned with the waste heat of chilling tower 4 to thermal desorption is entered
The nitrogen of rotary kiln 1 carries out being heated to 300 DEG C or so, guarantees the temperature close into kiln nitrogen and contaminated soil 7, reduces to thermal desorption
The influence of effect.
(2), contaminated soil 7 surface of the nitrogen after the divergent nozzle 11 on air gun 10 is equably sprayed onto heating, reduces
The oxygen content of dioxin formation zone reduces the production quantity of dioxin, even existing dioxin in pollution degradation soil；
During above-mentioned two, contaminated soil thermal desorption device keeps continuous feed and discharge to run.Nitrogen flow, air gun
10 arrangement for entering kiln depth and divergent nozzle 11 is according to the progress of the disposing capacity and thermal desorption required temperature of thermal desorption device
It adjusts.
Utility model principles illustrated:
Oxygen is the key factor of dioxin de novo formation, the production quantity of dioxin with oxygen content (0-10%) increasing
The oxygen content for adding and increasing, therefore reduce reaction gas during thermal desorption of contaminated soil 7 can reduce the life of dioxin
Cheng Liang.To the temperature window (250-600 of contaminated soil 7 profiling temperatures in thermal desorption rotary kiln 1 and dioxin generation
DEG C) compare, only small part contaminated soil is in the temperature region that dioxin generates in discovery thermal desorption rotary kiln 1, because
This, which can equably spray into a small amount of nitrogen, reduces the oxygen content in the region, to reduce the production quantity of dioxin, even drops
Solve original dioxin in contaminated soil 7.Thermal desorption device scale is smaller, exhaust gas volumn in kiln, and the nitrogen total amount of penetrating is less, because
This influences the stable operation of thermal desorption device negligible.
In addition, it should be noted that, the specific embodiments described in this specification, the shape of parts and components are named
Title etc. can be different, and above content is only to the utility model structure example explanation described in this specification.
All equivalence changes or simple change done according to structure, feature and principle described in the concept of the patent of the utility model, are wrapped
It includes in the protection scope of the utility model patent.Those skilled in the art of the present invention can be to described
Specific embodiment does various modifications or additions or is substituted in a similar manner, without departing from the knot of the utility model
Structure or beyond the scope defined by this claim, all should belong to the protection range of the utility model.
Claims (8)
1. a kind of contaminated soil thermal desorption device, including thermal desorption rotary kiln and chilling tower；It is characterized by also including nitrogen storages
Gas tank, heat-exchange tube, air gun and divergent nozzle；Nitrogen air accumulator is connected by pipeline with the import of heat-exchange tube, heat-exchange tube
It is arranged in chilling tower middle and lower part region；The outlet of heat-exchange tube is connected with air gun, and air gun stretches to two in thermal desorption rotary kiln
English formation zone is disliked, divergent nozzle is installed on air gun, divergent nozzle is located at the top of contaminated soil in thermal desorption rotary kiln.
2. contaminated soil thermal desorption device according to claim 1, it is characterised in that: the nitrogen air accumulator is provided with
Gas flow control valve and flow measurement device.
3. contaminated soil thermal desorption device according to claim 1, it is characterised in that: the air gun is measured equipped with temperature
Device.
4. contaminated soil thermal desorption device according to claim 1, it is characterised in that: the divergent nozzle and Polluted Soil
Earth is in the vertical direction at a distance of 5-10cm.
5. contaminated soil thermal desorption device according to claim 1, it is characterised in that: separated at the top of the air gun several
Branch, every branch road are respectively arranged with divergent nozzle.
6. contaminated soil thermal desorption device according to claim 5, it is characterised in that: every branch is at a distance of 20-
40cm, the spacing of the nozzle of same branch are 20-40cm.
7. contaminated soil thermal desorption device according to claim 1, it is characterised in that: be surrounded by heat preservation outside the air gun
Material.
8. contaminated soil thermal desorption device according to claim 1, it is characterised in that: the air gun is not returned with thermal desorption
Rotary kiln is rotated and is rotated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820686031.0U CN208583804U (en) | 2018-05-09 | 2018-05-09 | Contaminated soil thermal desorption device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820686031.0U CN208583804U (en) | 2018-05-09 | 2018-05-09 | Contaminated soil thermal desorption device |
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| Publication Number | Publication Date |
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| CN208583804U true CN208583804U (en) | 2019-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820686031.0U Active CN208583804U (en) | 2018-05-09 | 2018-05-09 | Contaminated soil thermal desorption device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108500046A (en) * | 2018-05-09 | 2018-09-07 | 中国联合工程有限公司 | Contaminated soil thermal desorption device and its method for reducing dioxin generation |
-
2018
- 2018-05-09 CN CN201820686031.0U patent/CN208583804U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108500046A (en) * | 2018-05-09 | 2018-09-07 | 中国联合工程有限公司 | Contaminated soil thermal desorption device and its method for reducing dioxin generation |
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