CN110560472A - Method and equipment for soil pyrolysis treatment - Google Patents
Method and equipment for soil pyrolysis treatment Download PDFInfo
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- CN110560472A CN110560472A CN201910635134.3A CN201910635134A CN110560472A CN 110560472 A CN110560472 A CN 110560472A CN 201910635134 A CN201910635134 A CN 201910635134A CN 110560472 A CN110560472 A CN 110560472A
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- 238000000197 pyrolysis Methods 0.000 title claims abstract description 194
- 239000002689 soil Substances 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000003795 desorption Methods 0.000 claims abstract description 142
- 239000007789 gas Substances 0.000 claims abstract description 69
- 239000000779 smoke Substances 0.000 claims abstract description 65
- 239000000428 dust Substances 0.000 claims abstract description 62
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000003546 flue gas Substances 0.000 claims abstract description 39
- 238000000926 separation method Methods 0.000 claims abstract description 19
- 238000002485 combustion reaction Methods 0.000 claims abstract description 17
- 238000007599 discharging Methods 0.000 claims abstract description 17
- 230000008929 regeneration Effects 0.000 abstract description 2
- 238000011069 regeneration method Methods 0.000 abstract description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 6
- 238000002156 mixing Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 1
- 230000001754 anti-pyretic effect Effects 0.000 description 1
- 239000002221 antipyretic Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
- B09C1/065—Reclamation of contaminated soil thermally by pyrolysis
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Incineration Of Waste (AREA)
- Gasification And Melting Of Waste (AREA)
Abstract
The invention belongs to the technical field of regeneration of polluted soil, and particularly relates to a method and equipment for pyrolysis treatment of soil. The soil pyrolysis treatment method comprises the steps of soil conveying, soil pyrolysis, pyrolysis flue gas separation, high-temperature smoke and dust re-pyrolysis and the like. This equipment of soil pyrolysis treatment includes first pyrolysis desorption stove, second pyrolysis desorption stove, flue gas separator, pyrolysis gas burner, tail gas processing apparatus, discharging device, first pyrolysis desorption stove carries out the pyrolysis desorption to the soil of treating, second pyrolysis desorption stove is used for carrying out pyrolysis desorption once more to the high temperature smoke and dust, pyrolysis gas burner is used for carrying out combustion processing to soil pyrolysis gas and the smoke and dust pyrolysis gas of deriving from second pyrolysis desorption stove, tail gas processing apparatus is used for purifying the back with the tail gas that comes out from pyrolysis gas burner and discharges. The method and the equipment for the soil pyrolysis treatment can be used for carrying out thorough pyrolysis desorption treatment on the pyrolysis flue gas, and can be used for improving the treatment efficiency of the pyrolysis desorption process.
Description
Technical Field
The invention belongs to the technical field of regeneration of polluted soil, and particularly relates to a method and equipment for pyrolysis treatment of soil.
Background
pyrolytic desorption technology has been widely used to remediate organic contaminated soil. The soil is heated to 200-600 ℃, and organic pollutants in the soil can be effectively removed.
At present, the thermal desorption system aiming at the organic polluted soil mainly comprises two types: one is an indirect pyrolysis desorption system, namely, soil and hot flue gas are separated, and the soil is indirectly heated through a sleeve or a hollow blade, so that the system has the advantages of smaller treatment capacity and treatment difficulty of tail gas, lower heat exchange efficiency of the indirect pyrolysis desorption system, relatively complex equipment, high equipment cost and low treatment capacity of the equipment; the other type is a direct pyrolysis desorption system, namely, hot flue gas is directly contacted with soil to be treated and heated to a specified temperature, the method has the advantages that the soil is directly contacted with the hot flue gas, the heat exchange efficiency is high, the treatment capacity of the equipment is large, however, because the hot flue gas is directly contacted with the soil, the gas content of the hot flue gas is large, and tiny particles in the soil are carried, so that the dust content of desorption gas is large.
In the desorption gas generated by the direct pyrolysis desorption system, the content concentration of organic pollutants in the smoke dust is higher, if the smoke dust is directly cooled and dedusted, the smoke dust can not reach the emission standard, and the maintenance frequency of the equipment is higher. As technical improvement, the technical scheme adopted by the company is as follows: most of the large-particle smoke dust is intercepted by a multi-tube dust remover, and then the intercepted large-particle smoke dust and the raw materials are mixed and returned to the furnace for treatment. In the mixing and re-melting treatment process, the smoke dust can circulate all the time, the working temperature of direct pyrolysis desorption is about 500 ℃, the smoke temperature at the multi-tube dust remover is about 200 ℃, and organic pollutants can be combined with the smoke dust at the multi-tube dust remover, so that the treatment effect of mixing and re-melting treatment is not ideal.
Disclosure of Invention
the invention aims to overcome the defects of the prior art and provide a method and equipment for soil pyrolysis treatment, so that pyrolysis desorption treatment on pyrolysis flue gas is relatively thorough, and the treatment efficiency of a pyrolysis desorption process is improved.
In order to achieve the purpose, the technical scheme of the invention is as follows:
A method for the pyrolytic treatment of soil comprising
(1) Soil conveying: conveying the soil to be treated to a feeding bin;
(2) Soil pyrolysis: after being fed from the feeding bin, the soil enters a first pyrolysis desorption furnace for pyrolysis desorption, pyrolysis flue gas is led out from the first pyrolysis desorption furnace, and the treated soil is discharged from the first pyrolysis desorption furnace;
(3) And (3) pyrolysis flue gas separation: carrying out flue gas separation on pyrolysis flue gas led out from the first pyrolysis desorption furnace to obtain high-temperature smoke dust and soil pyrolysis gas;
(4) High-temperature smoke re-pyrolysis: and introducing the high-temperature smoke dust into the second pyrolysis desorption furnace for secondary pyrolysis desorption, leading out smoke dust pyrolysis gas from the second pyrolysis desorption furnace, and discharging the treated high-temperature smoke dust from the second pyrolysis desorption furnace.
As an improvement, the soil pyrolysis gas obtained in the step (3) and the smoke pyrolysis gas obtained in the step (4) are combusted, and tail gas treatment is carried out, so that the emission reaches the standard.
As an improvement, the soil obtained in the step (2) and the high-temperature smoke dust obtained in the step (4) are discharged through the same discharging device.
as a further improvement, the first thermal desorption furnace is a direct thermal desorption furnace.
As a further improvement, the second thermal desorption furnace is an indirect thermal desorption furnace.
The invention also provides equipment for soil pyrolysis treatment, which comprises a pyrolysis desorption furnace, a smoke gas separation device, a pyrolysis gas combustion device, a tail gas treatment device and a discharging device, wherein the pyrolysis desorption furnace comprises a first pyrolysis desorption furnace and a second pyrolysis desorption furnace, the first pyrolysis desorption furnace is used for introducing pyrolysis smoke gas to the smoke gas separation device after the soil to be treated is subjected to pyrolysis desorption, the smoke gas separation device is used for separating the pyrolysis smoke gas into high-temperature smoke dust and soil pyrolysis gas, the second pyrolysis desorption furnace is used for carrying out pyrolysis desorption on the high-temperature smoke dust again, the pyrolysis gas combustion device is used for carrying out combustion treatment on the soil pyrolysis gas and smoke dust pyrolysis gas led out from the second pyrolysis desorption furnace, and the tail gas treatment device is used for purifying and discharging tail gas discharged from the pyrolysis gas combustion device.
As a refinement, the first thermal desorption furnace is a direct thermal desorption furnace.
As a modification, the second thermal desorption furnace is an indirect thermal desorption furnace.
as a further improvement, the first pyrolysis desorption furnace and the second pyrolysis desorption furnace share the same discharging device.
As an improvement, the flue gas separation device is a multi-tube dust remover.
The invention has the following beneficial effects:
(1) the high-temperature smoke dust has the characteristic of easy dispersion, so the residence time of the high-temperature smoke dust in the first pyrolysis desorption furnace is short, and the high-temperature smoke dust cannot be fully treated. On the other hand, the working temperature of pyrolysis desorption is about 500 ℃, the flue gas temperature at the multi-tube dust collector is about 200 ℃, and organic pollutants are combined with the smoke dust at the multi-tube dust collector, so that the content of the organic pollutants in the high-temperature smoke dust is still high. The second pyrolysis desorption furnace is separately arranged for the high-temperature smoke dust, and after the high-temperature smoke dust is collected, the second pyrolysis desorption furnace carries out second pyrolysis desorption, so that the high-temperature smoke dust is subjected to more thorough antipyretic desorption treatment, and the emission standard requirement is met.
(2) Because the high temperature smoke and dust can carry out the pyrolysis desorption of second time at second pyrolysis desorption stove, so can increase the intake of first pyrolysis desorption stove, with the high temperature flue gas with the first pyrolysis desorption stove of area-time separation, reduce the dwell time of high temperature flue gas in first pyrolysis desorption stove, be favorable to organic pollutant desorption in soil to the pyrolysis desorption efficiency of first pyrolysis desorption stove has been improved.
(3) The first thermal desorption furnace is a direct thermal desorption furnace, and the second thermal desorption furnace is an indirect thermal desorption furnace. The direct pyrolysis desorption furnace is beneficial to improving the treatment efficiency, the indirect pyrolysis desorption furnace is suitable for carrying out pyrolysis desorption on high-temperature smoke dust which is easy to fly, the two pyrolysis desorption modes are complementary, and the improvement of the working efficiency is facilitated.
(4) Compared with the mode of mixing intercepted large-particle smoke dust with raw materials and conducting furnace returning treatment, the second thermal desorption furnace can timely remove high-temperature smoke dust, and is beneficial to reducing the coke hanging phenomenon in the first thermal desorption furnace and the smoke and soil in a transmission pipeline, so that the efficient operation of the whole system is guaranteed, and the soil treatment efficiency is improved.
(5) Compare with the large granule smoke and dust that will hold back and raw materials mix, the mode of handling of going back to the stove, high temperature smoke and dust behind the gas separation device, can get into second pyrolysis desorption stove immediately and carry out pyrolysis desorption once more, and the heat can not lose, has reduced the loss of energy, has also avoided mixing with the raw materials, air pollution that probably causes when going back to the stove, has also saved the cost of transportation.
(6) First pyrolysis desorption stove and the same discharging device of second pyrolysis desorption stove sharing are favorable to mixing the smoke and dust after handling with the soil after handling, reduce the smoke and dust ejection of compact back and drift everywhere.
Drawings
Fig. 1 is a schematic structural diagram of the invention.
In the figure: 1. a first thermal desorption furnace; 11. a feeding bin; 2. a second thermal desorption furnace; 3. a flue gas separation device; 4. a pyrolysis gas combustion device; 5. a tail gas treatment device; 6. a discharging device; 7. a combustion chamber; 8. an automatic regulating valve; 9. a middle fan.
Detailed Description
example 1
the soil pyrolysis treatment method comprises the following steps
(1) Soil conveying: conveying the soil to be treated to a feeding bin;
(2) Soil pyrolysis: after being fed from the feeding bin, the soil enters a first pyrolysis desorption furnace for pyrolysis desorption, the first pyrolysis desorption furnace is a direct pyrolysis desorption furnace, pyrolysis flue gas is led out from the first pyrolysis desorption furnace, and the treated soil is discharged from the first pyrolysis desorption furnace;
(3) And (3) pyrolysis flue gas separation: carrying out flue gas separation on pyrolysis flue gas led out from the first pyrolysis desorption furnace to obtain high-temperature smoke dust and soil pyrolysis gas;
(4) high-temperature smoke re-pyrolysis: and (2) introducing the high-temperature smoke dust into a second pyrolysis desorption furnace for secondary pyrolysis desorption, wherein the second pyrolysis desorption furnace is an indirect pyrolysis desorption furnace, smoke dust pyrolysis gas is led out from the second pyrolysis desorption furnace, the treated high-temperature smoke dust is discharged from the second pyrolysis desorption furnace, the soil pyrolysis gas obtained in the step (3) and the smoke dust pyrolysis gas obtained in the step (4) are combusted, the tail gas is treated and then discharged after reaching the standard, and the soil obtained in the step (2) and the high-temperature smoke dust obtained in the step (4) are discharged through the same discharging device.
As shown in fig. 1, the soil pyrolysis treatment equipment of the present invention includes a pyrolysis desorption furnace, a flue gas separation device 3, a pyrolysis gas combustion device 4, a tail gas treatment device 5, and a discharge device 6, wherein the pyrolysis desorption furnace includes a first pyrolysis desorption furnace 1 and a second pyrolysis desorption furnace 2, the first pyrolysis desorption furnace 1 conducts pyrolysis desorption on soil to be treated and then guides pyrolysis flue gas to the flue gas separation device 3, the flue gas separation device 3 is a multi-tube dust collector, an air inlet of the multi-tube dust collector is communicated with a pyrolysis flue gas outlet of the first pyrolysis desorption furnace 1, and an ash discharge port of the multi-tube dust collector is connected with a feed inlet of the second pyrolysis desorption furnace 2. Flue gas separator 3 is used for separating into high temperature smoke and dust and soil pyrolysis gas with the pyrolysis flue gas, second pyrolysis desorption stove 2 is used for carrying out pyrolysis desorption once more to the high temperature smoke and dust, pyrolysis gas burner 4 is used for carrying out combustion processing to soil pyrolysis gas and the smoke and dust pyrolysis gas of deriving from the second pyrolysis desorption stove, tail gas processing apparatus 5 is used for purifying the back emission with the tail gas that comes out from pyrolysis gas burner, how the tail gas after the combustion processing handles, can refer to the patent application before this company.
the first pyrolysis desorption furnace 1 is a direct pyrolysis desorption furnace, in particular to a rotary direct pyrolysis desorption furnace, a heat source is provided by a combustion chamber 7, the temperature in the pyrolysis gas combustion device 4 and the combustion chamber 7 is 900 ~ 1100 ℃, an intermediate fan 9 introduces soil pyrolysis gas and smoke pyrolysis gas led out from the second pyrolysis desorption furnace into the pyrolysis gas combustion device 4 or the combustion chamber 7, and toxic and harmful components and combustible components in the soil pyrolysis gas and the smoke pyrolysis gas are decomposed at high temperature in the furnace, so that harmless treatment is realized.
the second thermal desorption furnace 2 is an indirect thermal desorption furnace, in particular to a spiral propelling type indirect thermal desorption furnace, the spiral of the second thermal desorption furnace is driven by a variable frequency motor, the frequency is continuously adjustable, the furnace body adopts an isothermal electric heating method, the discharging temperature is controllable at 200 ~ 500 ℃, the exhaust port of the indirect thermal desorption furnace 2 is connected with an intermediate fan 9 through an automatic regulating valve 8, and the pressure in the indirect thermal desorption furnace 2 is controlled within the range of ~ 150Pa to ~ 50Pa through regulating the automatic regulating valve 8.
The first thermal desorption furnace 1 and the second thermal desorption furnace 2 share the same discharging device 6.
Claims (10)
1. The method for the pyrolysis treatment of the soil is characterized by comprising the following steps: comprises that
(1) Soil conveying: conveying the soil to be treated to a feeding bin;
(2) Soil pyrolysis: after being fed from the feeding bin, the soil enters a first pyrolysis desorption furnace for pyrolysis desorption, pyrolysis flue gas is led out from the first pyrolysis desorption furnace, and the treated soil is discharged from the first pyrolysis desorption furnace;
(3) and (3) pyrolysis flue gas separation: carrying out flue gas separation on pyrolysis flue gas led out from the first pyrolysis desorption furnace to obtain high-temperature smoke dust and soil pyrolysis gas;
(4) High-temperature smoke re-pyrolysis: and introducing the high-temperature smoke dust into the second pyrolysis desorption furnace for secondary pyrolysis desorption, leading out smoke dust pyrolysis gas from the second pyrolysis desorption furnace, and discharging the treated high-temperature smoke dust from the second pyrolysis desorption furnace.
2. A method of soil pyrolysis treatment according to claim 1, characterized in that: and (4) burning the soil pyrolysis gas obtained in the step (3) and the smoke pyrolysis gas obtained in the step (4) and treating tail gas to achieve the emission standard.
3. a method of soil pyrolysis treatment according to claim 1, characterized in that: and (3) discharging the soil obtained in the step (2) and the high-temperature smoke dust obtained in the step (4) through the same discharging device.
4. A method of soil pyrolysis treatment according to claim 1, characterized in that: the first thermal desorption furnace is a direct thermal desorption furnace.
5. A method of soil pyrolysis treatment according to claim 1, characterized in that: the second thermal desorption furnace is an indirect thermal desorption furnace.
6. The equipment for the soil pyrolysis treatment comprises a pyrolysis desorption furnace, a flue gas separation device, a pyrolysis gas combustion device, a tail gas treatment device and a discharging device, and is characterized in that: the pyrolysis desorption stove includes first pyrolysis desorption stove and second pyrolysis desorption stove, first pyrolysis desorption stove leads the pyrolysis flue gas to the flue gas separator after carrying out the pyrolysis desorption to the soil of treating, the flue gas separator is used for separating the pyrolysis flue gas into high temperature smoke and dust and soil pyrolysis gas, the second pyrolysis desorption stove is used for carrying out pyrolysis desorption once more to the high temperature smoke and dust, pyrolysis gas burner is used for carrying out combustion processing to soil pyrolysis gas and the smoke and dust pyrolysis gas of deriving from the second pyrolysis desorption stove, tail gas processing apparatus is used for discharging after purifying the tail gas that comes out from pyrolysis gas burner.
7. The apparatus for the pyrolysis treatment of soil according to claim 6, wherein: the first thermal desorption furnace is a direct thermal desorption furnace.
8. The apparatus for the pyrolysis treatment of soil according to claim 6, wherein: the second thermal desorption furnace is an indirect thermal desorption furnace.
9. The apparatus for the pyrolysis treatment of soil according to claim 6, wherein: the first pyrolysis desorption furnace and the second pyrolysis desorption furnace share the same discharging device.
10. the apparatus for the pyrolysis treatment of soil according to claim 6, wherein: the flue gas separation device is a multi-tube dust remover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910635134.3A CN110560472A (en) | 2019-07-15 | 2019-07-15 | Method and equipment for soil pyrolysis treatment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910635134.3A CN110560472A (en) | 2019-07-15 | 2019-07-15 | Method and equipment for soil pyrolysis treatment |
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| CN110560472A true CN110560472A (en) | 2019-12-13 |
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| CN201910635134.3A Pending CN110560472A (en) | 2019-07-15 | 2019-07-15 | Method and equipment for soil pyrolysis treatment |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003033747A (en) * | 2001-07-25 | 2003-02-04 | Ebara Corp | Method and device for treating dust in soil treatment |
| CN107096790A (en) * | 2017-06-30 | 2017-08-29 | 浙江宜可欧环保科技有限公司 | Polluted soil pyrolysis desorption prosthetic appliance and method |
| CN108405590A (en) * | 2018-04-23 | 2018-08-17 | 永清环保股份有限公司 | High boiling point organic compound contaminated soil remediation system adopting recirculating and restorative procedure |
| CN211489031U (en) * | 2019-07-15 | 2020-09-15 | 浙江宜可欧环保科技有限公司 | Soil pyrolysis treatment equipment |
-
2019
- 2019-07-15 CN CN201910635134.3A patent/CN110560472A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003033747A (en) * | 2001-07-25 | 2003-02-04 | Ebara Corp | Method and device for treating dust in soil treatment |
| CN107096790A (en) * | 2017-06-30 | 2017-08-29 | 浙江宜可欧环保科技有限公司 | Polluted soil pyrolysis desorption prosthetic appliance and method |
| CN108405590A (en) * | 2018-04-23 | 2018-08-17 | 永清环保股份有限公司 | High boiling point organic compound contaminated soil remediation system adopting recirculating and restorative procedure |
| CN211489031U (en) * | 2019-07-15 | 2020-09-15 | 浙江宜可欧环保科技有限公司 | Soil pyrolysis treatment equipment |
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