CN111451265A - Soil pre-drying system for contaminated site remediation and use method - Google Patents
Soil pre-drying system for contaminated site remediation and use method Download PDFInfo
- Publication number
- CN111451265A CN111451265A CN202010376792.8A CN202010376792A CN111451265A CN 111451265 A CN111451265 A CN 111451265A CN 202010376792 A CN202010376792 A CN 202010376792A CN 111451265 A CN111451265 A CN 111451265A
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- CN
- China
- Prior art keywords
- soil
- rotary kiln
- flue gas
- tail gas
- combustion chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002689 soil Substances 0.000 title claims abstract description 79
- 238000001035 drying Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims description 14
- 238000005067 remediation Methods 0.000 title claims description 9
- 239000007789 gas Substances 0.000 claims abstract description 79
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 63
- 239000003546 flue gas Substances 0.000 claims abstract description 63
- 238000002485 combustion reaction Methods 0.000 claims abstract description 59
- 238000003795 desorption Methods 0.000 claims abstract description 38
- 239000000428 dust Substances 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 4
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
Images
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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
- F27D2013/007—Apparatus for preheating charges; Arrangements for preheating charges using a rotary furnace
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to the technical field of soil drying, in particular to a soil pre-drying system for repairing a contaminated site, which comprises a secondary combustion chamber, an indirect rotary kiln, a dust remover, a condenser and a fan, wherein the indirect rotary kiln comprises a soil inlet, a soil outlet, a flue gas inlet, a flue gas outlet and a dry tail gas outlet, the secondary combustion chamber comprises a thermal desorption tail gas inlet, a dry tail gas inlet and a flue gas outlet, a high-temperature flue gas outlet of the secondary combustion chamber is communicated with a flue gas inlet of the indirect rotary kiln, the dry tail gas outlet of the indirect rotary kiln is communicated with the inlet of the dust remover, the outlet of the dust remover is communicated with the inlet of the condenser, and the fan is communicated and arranged between the dry tail gas inlet of the secondary combustion chamber and the gas outlet of the condenser. Meanwhile, tail gas generated in the pre-drying process is treated, so that secondary pollution is reduced.
Description
Technical Field
The invention relates to the technical field of soil drying, in particular to a soil pre-drying system for repairing a polluted site and a using method thereof.
Background
The soil thermal desorption technology is a soil remediation method widely applied to soil polluted by volatile organic compounds, and has a wide application prospect. The method comprises the steps of heating the soil polluted by organic matters to a certain temperature, selectively volatilizing the pollutants by controlling the system temperature and the retention time, separating soil particles from the pollutants, and carrying out subsequent treatment to realize the process of soil remediation.
At present, a soil thermal desorption system generally sends thermal desorption tail gas into a secondary combustion chamber for combustion in order to prevent the thermal desorption tail gas from causing secondary pollution, and then sends the thermal desorption tail gas into a quench tower for cooling. The temperature of the flue gas in the secondary combustion chamber is about 800-. Meanwhile, because the soil contains a large amount of moisture and the specific heat capacity of water is large, the untreated soil is directly fed into the heating unit, and the energy utilization efficiency is also reduced. The soil to be restored is pre-dried by heat generated by combustion in the secondary combustion chamber, so that the energy utilization efficiency can be improved, and a large amount of energy can be saved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a soil pre-drying system for repairing a polluted site and a using method thereof.
In order to achieve the purpose, the invention provides the following technical scheme: a soil pre-drying system for repairing a polluted site comprises a secondary combustion chamber, an indirect rotary kiln, a dust remover, a condenser and a fan, wherein the indirect rotary kiln comprises a soil inlet, a soil outlet, a flue gas inlet, a flue gas outlet and a dry tail gas outlet, the secondary combustion chamber comprises a thermal desorption tail gas inlet, a dry tail gas inlet and a flue gas outlet,
the thermal desorption tail gas inlet of the secondary combustion chamber is input with the soil thermal desorption tail gas of an external thermal desorption kiln, the high-temperature flue gas outlet of the secondary combustion chamber is communicated with the flue gas inlet of the indirect rotary kiln, the dry tail gas outlet of the indirect rotary kiln is communicated with the inlet of the dust remover, the outlet of the dust remover is communicated with the inlet of the condenser, the fan is communicated and arranged between the dry tail gas inlet of the secondary combustion chamber and the gas outlet of the condenser,
the soil inlet input of indirect rotary kiln is used for the soil of predrying, and the soil outlet of indirect rotary kiln is used for dry soil output, and the exhanst gas outlet of indirect rotary kiln communicates with outside follow-up flue gas processing apparatus.
Preferably, the dust remover is a bag-type dust remover.
Preferably, the condenser is a finned tube condenser.
In order to achieve the above purpose, the invention also provides the following technical scheme: a use method of a soil pre-drying system for contaminated site remediation comprises the following steps:
(1) the thermal desorption tail gas from the thermal desorption kiln is introduced into a thermal desorption tail gas inlet of the secondary combustion chamber and then is ignited in the secondary combustion chamber;
(2) the thermal desorption tail gas is fully combusted in the secondary combustion chamber, the flue gas generated in the combustion process is transmitted to the flue gas inlet of the indirect rotary kiln through the high-temperature flue gas outlet of the secondary combustion chamber, and the indirect rotary kiln is heated through the high-temperature flue gas output by the secondary combustion chamber;
(3) the soil needing to be pre-dried is filled in a soil inlet of the indirect rotary kiln, and the soil achieves the purpose of pre-drying through the heat of high-temperature flue gas;
(4) discharging the pre-dried soil from a soil outlet of the indirect rotary kiln to a subsequent thermal desorption device;
(5) introducing the dry tail gas generated in the soil pre-drying process into a dust remover from a dry tail gas outlet of the indirect rotary kiln for dust removal treatment;
(6) introducing the dried tail gas subjected to dust removal into a condenser for cooling and condensation;
(7) the condenser absorbs the heat of the dry tail gas from the indirect rotary kiln and condenses the dry tail gas, condensed water generated in the condensing process is sent to the water treatment unit from a condensed water outlet of the condenser, and the rest gas is sent to a secondary combustion chamber from a gas outlet of the condenser through a fan;
(8) after the high-temperature flue gas sent into the indirect rotary kiln by the secondary combustion chamber heats the soil, the high-temperature flue gas is sent to a subsequent flue gas treatment system from a flue gas outlet of the indirect rotary kiln.
Compared with the prior art, the invention has the beneficial effects that: the waste heat of the secondary combustion chamber is recycled to the soil pre-drying equipment, so that not only is the flue gas energy of the secondary combustion chamber fully utilized, but also the humidity of the soil to be repaired can be reduced, and the energy utilization rate of the soil during thermal desorption is improved;
according to the invention, the indirect rotary kiln absorbs the waste heat of the secondary combustion chamber, and the pre-drying soil filled in the indirect rotary kiln is heated, so that the humidity of the pre-drying soil is reduced, and the energy consumption during thermal desorption is further reduced;
the indirect rotary kiln is used, the flue gas and the pre-drying tail gas are mutually isolated, and secondary pollution generated by the subsequent treatment of the flue gas is reduced;
the pre-dried tail gas is sent into a secondary combustion chamber for incineration after passing through a bag-type dust collector and a fin tube condenser, so that secondary pollution of the pre-dried tail gas is reduced.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
In the figure: 1. an indirect rotary kiln; 101. a soil inlet; 102. a flue gas inlet; 103. a soil outlet; 104. a flue gas outlet; 105. a dry tail gas outlet; 2. a dust remover; 3. a condenser; 4. a fan; 5. a second combustion chamber; 501. a thermal desorption tail gas inlet; 502. a dry tail gas inlet; 503. and a high-temperature flue gas outlet.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: a soil pre-drying system for repairing a polluted site comprises a secondary combustion chamber, an indirect rotary kiln, a dust remover, a condenser and a fan, wherein the indirect rotary kiln comprises a soil inlet, a soil outlet, a flue gas inlet, a flue gas outlet and a dry tail gas outlet, the secondary combustion chamber comprises a thermal desorption tail gas inlet, a dry tail gas inlet and a high-temperature flue gas outlet,
the thermal desorption tail gas inlet of the secondary combustion chamber is input with the soil thermal desorption tail gas of an external thermal desorption kiln, the high-temperature flue gas outlet of the secondary combustion chamber is communicated with the flue gas inlet of the indirect rotary kiln, the dry tail gas outlet of the indirect rotary kiln is communicated with the inlet of the dust remover, the outlet of the dust remover is communicated with the inlet of the condenser, the fan is communicated and arranged between the dry tail gas inlet of the secondary combustion chamber and the gas outlet of the condenser,
the second combustion chamber 5 burns the soil thermal desorption tail gas from the thermal desorption kiln to generate high-temperature flue gas, the flue gas outlet of the second combustion chamber 5 is communicated with the flue gas inlet 102 of the indirect rotary kiln 1, the high-temperature flue gas generated by the second combustion chamber 5 is used for pre-drying the soil entering from the soil inlet 101, and the flue gas outlet 104 of the indirect rotary kiln 1 is communicated with a subsequent flue gas treatment device.
The soil inlet input of indirect rotary kiln is used for the soil of predrying, and the soil outlet of indirect rotary kiln is used for dry soil output, and the exhanst gas outlet of indirect rotary kiln communicates with outside follow-up flue gas processing apparatus.
The dry tail gas outlet 105 of the indirect rotary kiln 1 is communicated with the dry tail gas dust remover 2, the outlet end of the dry tail gas dust remover 2 is communicated with the condenser 3, and the dry tail gas fan 4 is communicated between the secondary combustion chamber 5 and the condenser 3 to send the dry tail gas into the secondary combustion chamber 5 for combustion so as to reduce secondary pollution.
The dust remover is a bag-type dust remover.
The condenser is a finned tube condenser.
A use method of a soil pre-drying system for contaminated site remediation comprises the following steps:
(1) the thermal desorption tail gas from the thermal desorption kiln is introduced into a thermal desorption tail gas inlet of the secondary combustion chamber and then is ignited in the secondary combustion chamber;
(2) the thermal desorption tail gas is fully combusted in the secondary combustion chamber, the flue gas generated in the combustion process is transmitted to the flue gas inlet of the indirect rotary kiln through the high-temperature flue gas outlet of the secondary combustion chamber, and the indirect rotary kiln is heated through the high-temperature flue gas output by the secondary combustion chamber;
(3) the soil needing to be pre-dried is filled in a soil inlet of the indirect rotary kiln, and the soil achieves the purpose of pre-drying through the heat of high-temperature flue gas;
(4) discharging the pre-dried soil from a soil outlet of the indirect rotary kiln to a subsequent thermal desorption device;
(5) introducing the dry tail gas generated in the soil pre-drying process into a dust remover from a dry tail gas outlet of the indirect rotary kiln for dust removal treatment;
(6) introducing the dried tail gas subjected to dust removal into a condenser for cooling and condensation;
(7) the condenser absorbs the heat of the dry tail gas from the indirect rotary kiln and condenses the dry tail gas, condensed water generated in the condensing process is sent to the water treatment unit from a condensed water outlet of the condenser, and the rest gas is sent to a secondary combustion chamber from a gas outlet of the condenser through a fan;
(8) after the high-temperature flue gas sent into the indirect rotary kiln by the secondary combustion chamber heats the soil, the high-temperature flue gas is sent to a subsequent flue gas treatment system from a flue gas outlet of the indirect rotary kiln.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The utility model provides a be used for prosthetic soil predrying system in contaminated site which characterized in that: comprises a secondary combustion chamber, an indirect rotary kiln, a dust remover, a condenser and a fan, wherein the indirect rotary kiln comprises a soil inlet, a soil outlet, a flue gas inlet, a flue gas outlet and a dry tail gas outlet, the secondary combustion chamber comprises a thermal desorption tail gas inlet, a dry tail gas inlet and a high-temperature flue gas outlet,
the thermal desorption tail gas inlet of the secondary combustion chamber is input with the soil thermal desorption tail gas of an external thermal desorption kiln, the high-temperature flue gas outlet of the secondary combustion chamber is communicated with the flue gas inlet of the indirect rotary kiln, the dry tail gas outlet of the indirect rotary kiln is communicated with the inlet of the dust remover, the outlet of the dust remover is communicated with the inlet of the condenser, the fan is communicated and arranged between the dry tail gas inlet of the secondary combustion chamber and the gas outlet of the condenser,
the soil inlet input of indirect rotary kiln is used for the soil of predrying, and the soil outlet of indirect rotary kiln is used for dry soil output, and the exhanst gas outlet of indirect rotary kiln communicates with outside follow-up flue gas processing apparatus.
2. The soil pre-drying system for contaminated site remediation of claim 1, wherein: the dust remover is a bag-type dust remover.
3. The soil pre-drying system for contaminated site remediation of claim 1, wherein: the condenser is a finned tube condenser.
4. A use method of a soil pre-drying system for contaminated site remediation is characterized in that: the method comprises the following steps:
(1) the thermal desorption tail gas from the thermal desorption kiln is introduced into a thermal desorption tail gas inlet of the secondary combustion chamber and then is ignited in the secondary combustion chamber;
(2) the thermal desorption tail gas is fully combusted in the secondary combustion chamber, the flue gas generated in the combustion process is transmitted to the flue gas inlet of the indirect rotary kiln through the high-temperature flue gas outlet of the secondary combustion chamber, and the indirect rotary kiln is heated through the high-temperature flue gas output by the secondary combustion chamber;
(3) the soil needing to be pre-dried is filled in a soil inlet of the indirect rotary kiln, and the soil achieves the purpose of pre-drying through the heat of high-temperature flue gas;
(4) discharging the pre-dried soil from a soil outlet of the indirect rotary kiln to a subsequent thermal desorption device;
(5) introducing the dry tail gas generated in the soil pre-drying process into a dust remover from a dry tail gas outlet of the indirect rotary kiln for dust removal treatment;
(6) introducing the dried tail gas subjected to dust removal into a condenser for cooling and condensation;
(7) the condenser absorbs the heat of the dry tail gas from the indirect rotary kiln and condenses the dry tail gas, condensed water generated in the condensing process is sent to the water treatment unit from a condensed water outlet of the condenser, and the rest gas is sent to a secondary combustion chamber from a gas outlet of the condenser through a fan;
(8) after the high-temperature flue gas sent into the indirect rotary kiln by the secondary combustion chamber heats the soil, the high-temperature flue gas is sent to a subsequent flue gas treatment system from a flue gas outlet of the indirect rotary kiln.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010376792.8A CN111451265A (en) | 2020-05-07 | 2020-05-07 | Soil pre-drying system for contaminated site remediation and use method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010376792.8A CN111451265A (en) | 2020-05-07 | 2020-05-07 | Soil pre-drying system for contaminated site remediation and use method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111451265A true CN111451265A (en) | 2020-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010376792.8A Pending CN111451265A (en) | 2020-05-07 | 2020-05-07 | Soil pre-drying system for contaminated site remediation and use method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112240557A (en) * | 2020-08-26 | 2021-01-19 | 中国计量大学 | Low NO for soil thermal desorptionxFlue gas heat recycling system and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4132107A1 (en) * | 1990-10-04 | 1992-04-09 | Walter Ing Rieger | Treating organic and inorganic hazardous material - involves degassing and burning reconditioned material |
| CN207271801U (en) * | 2017-08-07 | 2018-04-27 | 永清环保股份有限公司 | A kind of contaminated soil thermal desorption pretreatment unit |
| CN110848715A (en) * | 2019-11-27 | 2020-02-28 | 中国计量大学 | Thermal desorption soil drying system for recycling waste heat of secondary combustion chamber and using method |
| CN212329238U (en) * | 2020-05-07 | 2021-01-12 | 中国计量大学 | Soil pre-drying system for contaminated site remediation |
-
2020
- 2020-05-07 CN CN202010376792.8A patent/CN111451265A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4132107A1 (en) * | 1990-10-04 | 1992-04-09 | Walter Ing Rieger | Treating organic and inorganic hazardous material - involves degassing and burning reconditioned material |
| CN207271801U (en) * | 2017-08-07 | 2018-04-27 | 永清环保股份有限公司 | A kind of contaminated soil thermal desorption pretreatment unit |
| CN110848715A (en) * | 2019-11-27 | 2020-02-28 | 中国计量大学 | Thermal desorption soil drying system for recycling waste heat of secondary combustion chamber and using method |
| CN212329238U (en) * | 2020-05-07 | 2021-01-12 | 中国计量大学 | Soil pre-drying system for contaminated site remediation |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112240557A (en) * | 2020-08-26 | 2021-01-19 | 中国计量大学 | Low NO for soil thermal desorptionxFlue gas heat recycling system and method |
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