CN112705563B - Multi-section double-source integrated soil thermal desorption device - Google Patents
Multi-section double-source integrated soil thermal desorption device Download PDFInfo
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- CN112705563B CN112705563B CN202011384793.3A CN202011384793A CN112705563B CN 112705563 B CN112705563 B CN 112705563B CN 202011384793 A CN202011384793 A CN 202011384793A CN 112705563 B CN112705563 B CN 112705563B
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- thermal desorption
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- 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
Abstract
The invention provides a multi-section double-source integrated soil thermal desorption device which comprises a feeding unit, a thermal desorption unit, a combustion unit and a tail gas purification unit, wherein the feeding unit is connected with the thermal desorption unit; the thermal desorption unit comprises a first rotary body and a second rotary body, a sealing shell is arranged on the outer side of the downstream part of the first rotary body, the inlet of the shell is connected with the outlet of the combustion unit, the outlet of the shell is connected with the inlet of the feeding unit, and the outlet of the feeding unit is connected with the inlet of the tail gas purification unit; the first rotary body is a cylinder structure with openings at two ends formed by connecting heat pipes and first fins, the heat pipes are obliquely arranged along the feeding direction of materials, and phase-change materials are filled in the closed parts at two ends of each heat pipe; an electric heating sheet is arranged on the inner wall of the first fin; the second revolving body is connected into a cylinder structure with two open ends by a cooling water pipe and second fins, and the inlet of the second revolving body is in butt joint with the outlet of the first revolving body. The heat sources of the thermal desorption unit come from flue gas and electric heating, and the internal and external arrangement mode of the double heat sources can greatly save energy consumption and improve the thermal desorption efficiency of soil.
Description
Technical Field
The invention relates to the technical field of contaminated soil remediation, in particular to a multi-section double-source integrated soil thermal desorption device.
Background
The technologies for remedying the organic contaminated soil are mainly classified into three types, namely physical remediation, chemical remediation and biological remediation and a combined remediation technology based on the technologies. The thermal desorption remediation technology is one of the most effective methods, organic pollutants in the polluted soil are volatilized by heating the polluted soil, and the method has the advantages of high pollutant removal efficiency, short remediation period, wide application range, simple process principle and the like.
The prior thermal desorption technical scheme has great achievements in the convenience of soil desorption effect, but also has some problems: due to the limitation of the structural design of the thermal desorption device, the temperature control effect in the thermal desorption process is poor, the required energy consumption is high, the operation cost is high, and the energy utilization rate is low.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a multi-section double-source integrated soil thermal desorption device, which can greatly improve the soil thermal desorption efficiency by adopting a double-heat-source internal and external arrangement mode, thereby solving the technical problems of high energy consumption and poor temperature control effect.
The technical scheme adopted by the invention is as follows:
a multi-section double-source integrated soil thermal desorption device comprises a feeding unit, a thermal desorption unit, a combustion unit and a tail gas purification unit; the thermal desorption unit comprises a first rotary body and a second rotary body which are sequentially arranged along the material conveying direction, a sealing shell is arranged on the outer side of the downstream part of the first rotary body, a flue gas inlet of the shell is connected with a flue gas outlet of the combustion unit, a flue gas outlet of the shell is connected with a flue gas inlet of the feeding unit, and a flue gas outlet of the feeding unit is connected with a flue gas inlet of the tail gas purification unit; the first rotary body is connected into a cylinder structure with openings at two ends by heat pipes and first fins arranged between adjacent heat pipes, the heat pipes are obliquely arranged along the feeding direction of materials, and phase-change materials are filled in the closed parts at two ends of each heat pipe; an electric heating sheet is arranged on the inner side surface of the first fin; the second revolving body is connected by a cooling water pipe and second fins into a cylinder structure with two open ends, and the inlet of the second revolving body is in butt joint with the outlet of the first revolving body.
The cooling water pipe spirally extends from upstream to downstream along the feeding direction, the first fins are axially connected to the interval positions between the spiral pipe sections, and a cold water inlet and a hot water outlet are respectively arranged at two ends of the cooling water pipe.
The second revolving body and the first revolving body revolve synchronously.
The combustion unit comprises a combustor and a mixer, wherein a gas side outlet of the combustor is connected with a gas side inlet of the mixer, and a gas side outlet of the mixer is connected with an air inlet of the shell.
The air conditioner further comprises a preheater, wherein the preheater is provided with a water side inlet connected with the hot water outlet and a gas side outlet connected with the combustor.
The feeding unit adopts a double-screw feeder, and the outlet of the double-screw feeder is communicated with the inlet of the first revolving body.
The phase change material is water.
The invention has the following beneficial effects:
the heat source of the soil thermal desorption unit can be from flue gas or electric heating, the flue gas and the electric heating are arranged outside the first revolving body, the electric heating is arranged inside the first revolving body, and the double heat sources are arranged inside and outside the first revolving body, so that the energy consumption can be greatly saved, the soil thermal desorption efficiency can be improved, and the flexibility of equipment operation can also be improved. Meanwhile, the invention also has the following advantages:
1. according to the thermal desorption unit, the first rotary body corresponds to the drying section and the desorption section, and the free matching of the heat of the drying section and the heat of the desorption section is realized through the phase change of the water in the heat pipe, so that the over-high temperature of the desorption section can be avoided, the redundant heat can be transferred to the drying section to complete the drying of the soil to be desorbed, and the drying section equipment does not need to be arranged independently.
2. The second revolving body of the cooling section of the invention fully absorbs the waste heat of the desorbed soil through the spiral flow of the cooling water in the spiral pipe, and the heated cooling water can preheat the combustion air, thus improving the energy utilization rate, reducing the apparent temperature of the desorbed soil and facilitating the subsequent utilization.
3. The soil thermal desorption unit is integrated by the drying section, the desorption section and the cooling section, and the combined design is favorable for gradient utilization of energy, so that the thermal efficiency of equipment is improved, and the operation cost of the device is reduced.
4. According to the invention, gaseous organic pollutants generated during soil desorption are sent into the combustor to be combusted at high temperature, and the organic pollutants are converted into pollution-free gases such as carbon dioxide and water, so that the pressure of subsequent tail waste gas treatment can be reduced, the heat value of the organic pollutants is utilized, and the fuel cost required by normal operation of the combustor is saved.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic view of the internal structure of the thermal desorption unit of the present invention.
FIG. 3 is a schematic cross-sectional view of a first rotor according to the present invention.
In the figure: 1. an electrical heating sheet; 2. a housing; 3. a first fin; 4. a first rotary body; 41. a heat pipe; 5. a second rotary body; 51. a cooling water pipe; 6. a preheater; 7. a burner; 8. a mixer; 9. a tail gas purification unit; 10. a feed unit; 11. and a second fin.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1, the multistage dual-source integrated soil thermal desorption device of the present embodiment includes a feeding unit 10, a thermal desorption unit, a combustion unit, and a tail gas purification unit 9; the thermal desorption unit comprises a first revolving body 4 and a second revolving body 5 which are sequentially arranged along the material conveying direction, a sealing shell 2 is arranged on the outer side of the downstream part of the first revolving body 4, a flue gas inlet of the shell 2 is connected with a flue gas outlet of the combustion unit, a flue gas outlet of the shell 2 is connected with a flue gas inlet of the feeding unit 10, and a flue gas outlet of the feeding unit 10 is connected with a flue gas inlet of the tail gas purification unit 9;
as shown in fig. 2 and 3, the first rotator 4 is a cylindrical structure with two open ends formed by connecting heat pipes 41 and first fins 3 arranged between adjacent heat pipes 41, the heat pipes 41 are arranged obliquely along the feeding direction of the material, the two ends of each heat pipe 41 are sealed, and the interior of each heat pipe 41 is filled with a phase change material, specifically, the phase change material is water, and a certain pressure is maintained in each heat pipe 41.
The inner side surface of the first fin 3 is provided with an electric heating plate 1;
the second revolving body 5 is connected by the cooling water pipe 51 and the second fins 11 into a cylindrical structure with two open ends, and the inlet of the second revolving body 5 is butted with the outlet of the first revolving body 4.
The cooling water pipe 51 spirally extends from upstream to downstream along the feeding direction, the first fins 3 are axially connected at intervals between the spiral pipe sections, and a cold water inlet and a hot water outlet are respectively arranged at two ends of the cooling water pipe 51.
Specifically, steel pipes may be used for both the heat pipe 41 and the cooling water pipe 51.
Specifically, the second rotating body 5 rotates in synchronization with the first rotating body 4.
As shown in fig. 1, the combustion unit includes a burner 7 and a mixer 8, a gas-side outlet of the burner 7 is connected to a gas-side inlet of the mixer 8, and a gas-side outlet of the mixer 8 is connected to an air inlet of the casing 2.
A preheater 6 is also included, the preheater 6 having a water side inlet connected to the hot water outlet, and a gas side outlet connected to the burner 7.
The feeding unit 10 is a twin-screw type feeder, and an outlet thereof is communicated with an inlet of the first rotary body 4.
Specifically, the two spiral stirring units rotate in opposite directions, the surfaces of the two spiral stirring units are provided with bosses which are arranged in a staggered mode, and the centers of the spiral stirring units pass through smoke which is released by the combustion unit and absorbed by the thermal desorption unit.
Specifically, the thermal desorption unit adopts a rotary kiln device, the first revolving body 4 and the second revolving body 5 are used as the body of the rotary kiln to do rotary motion, and the shell 2 is fixedly installed outside the first revolving body 4.
As shown in fig. 1, a section of the first revolving body 4 of the thermal desorption unit corresponding to the housing 2 is a desorption section, a part without the housing 2 is a drying section, and a part corresponding to the second revolving body 5 is a cooling section;
as shown in fig. 2, the heat pipe 41 of the first rotating body 4 is inclined from the drying section to the desorption section, so that the phase-change material is accumulated in the heat pipe 41 located in the desorption section in the initial state, and after the part of the heat pipe 41 located in the desorption section is heated, the phase-change material is evaporated and flows toward the part of the heat pipe 41 located in the drying section. The water vapor flowing into the heat pipe 41 in the drying section is condensed into water when cooled and then flows back to the desorption section.
The working process of the invention is as follows:
the preheated soil enters a thermal desorption unit from a feeding unit 10 (the soil is in the cylinder, and the smoke flows outside the cylinder), gradually absorbs the heat of the heat pipe 41 and the electric heating sheet 1 on the cylinder along with the rotation of the first revolving body 4 in the drying section, and is discharged from an outlet of the second revolving body 5 after passing through a desorption section and a cooling section;
the flue gas that the combustion unit discharged gets into casing 2, the water in the heat pipe 41 of desorption section becomes steam flow direction heat pipe 41 of drying section after being heated, a drying and drying for drying section, steam in the heat pipe 41 of drying section is cooled and becomes the comdenstion water, flow direction desorption section, most moisture evaporation in the soil this moment, then get into the desorption section, along with the rotatory heat that absorbs steel pipe and electric heating piece 1 on the barrel fast of barrel, the temperature rises, solid-state and liquid pollutant in the soil are resolved from soil, form gaseous pollutant, soil after the desorption gets into cooling section 1, under the indirect cooling of cooling water, the temperature reduces, discharge from the thermal desorption unit and wait follow-up the use, and the cooling water is discharged from spiral form condenser tube 51 hot water outlet after being heated. Meanwhile, gaseous pollutants resolved from the soil are sent to the combustor 7, are fully mixed with fuel gas and combustion air and then undergo combustion reaction, generated hot flue gas is mixed with a certain amount of mixing air in the mixer 7, enters the desorption section 2 of the thermal desorption unit after reaching a required temperature, flows through the outside of the first rotary body 4 cylinder, heats water in the heat pipe 41, is discharged from the top of the desorption section, is introduced into the feeding unit 10, preheats the soil to be repaired, finally enters the tail gas purification unit 9, and is discharged to the atmosphere after the purification process of the flue gas is completed.
In the above process, the flow direction of the flue gas, the material and the cooling water is shown as the arrow direction in the figure.
In the above flow, the heat source of the drying section is from two parts, one part is from the heat released by the condensation of the water vapor in the heat pipe 41 (indirect heat transfer), and the other part is from the electric heating sheet 1; the heat source of the desorption section comes from two parts, one part is from hot flue gas generated by the combustor 8, and the other part is from the electric heating plate 1.
The heat transmission path of the hot flue gas is as follows: the heat of the hot flue gas is transferred to the first fins 3 and the heat pipe 41 in a convection mode, the first fins 3 transfer the heat to the soil inside the cylinder, the heat pipe 41 transfers part of the heat to the water in the pipe, and the other part of the heat is transferred to the soil inside the cylinder. The water in the heat pipe 41 absorbs heat and evaporates to become water vapor, the water vapor flows to the drying section, the heat is transferred to the heat pipe 41 in a condensation mode, and then the heat is transferred to the soil through the heat pipe 41.
In the process, soil and limestone are placed on two spirals of the feeding unit 10, crushing of massive soil and limestone materials and mutual mixing of particles after crushing are achieved through extrusion and collision of bosses on the surfaces of the spirals, and meanwhile, the materials absorb heat introduced into smoke in the process of being in contact with the surfaces of the spirals to complete the heating process.
In the process, the soil to be repaired from the feeding unit 10 enters the interior of the cylinder structure of the first rotating body of the drying section to absorb the heat of the cylinder, so that the water vapor in the heat pipe 41 is condensed into water and flows to the desorption section, the soil to be repaired sequentially passes through the drying section 3 and the desorption section 2 to complete the desorption process, the repaired soil enters the cooling section to emit heat and reduce the temperature, the cooling water in the cooling water pipe 51 enters from the inlet of the spiral pipe, the temperature rises after heat absorption, and the heated hot water can be introduced into the preheater 6 to serve as a heat source for heating the combustion air; the gas and the desorbed gaseous pollutants enter the combustor 7 as reducing agents, are fully mixed with combustion air which enters after being preheated by the preheater 6 to generate combustion reaction, and the generated hot flue gas is mixed with the mixing air in the mixer 8 to reach the required temperature and enters the shell 2.
According to the invention, the soil to be repaired is preheated, dried, thermally desorbed and cooled in a heating mode of combining external flue gas heating and internal electric heating of the heating sheet, pollutants in the soil are heated and converted from a liquid phase or a solid phase to a gas phase so as to be separated from the soil, the pollutants in the soil participate in a combustion reaction through suction, macromolecular pollutants are converted into micromolecular flue gas components, the micromolecular flue gas components are discharged into the atmosphere after heat release and purification, and the repaired soil returns to the ground after sensible heat recovery, so that the soil can be normally utilized.
The invention can realize the free matching of the heat of the drying section and the desorption section, thereby not only avoiding the over-high temperature of the desorption section, but also transferring the redundant heat to the drying section to complete the drying of the soil to be desorbed.
Claims (7)
1. A multi-section double-source integrated soil thermal desorption device is characterized by comprising a feeding unit (10), a thermal desorption unit, a combustion unit and a tail gas purification unit (9); the thermal desorption unit comprises a first rotary body (4) and a second rotary body (5) which are sequentially arranged along the material conveying direction, a sealing shell (2) is arranged on the outer side of the downstream part of the first rotary body (4), a flue gas inlet of the shell (2) is connected with a flue gas outlet of the combustion unit, a flue gas outlet of the shell (2) is connected with a flue gas inlet of the feeding unit (10), and a flue gas outlet of the feeding unit (10) is connected with a flue gas inlet of the tail gas purification unit (9);
the first rotary body (4) is connected into a cylinder structure with openings at two ends through heat pipes (41) and first fins (3) arranged between the adjacent heat pipes (41), the heat pipes (41) are obliquely arranged along the feeding direction of materials, and phase-change materials are filled in the closed inner parts at two ends of each heat pipe (41); an electric heating sheet (1) is arranged on the inner side surface of the first fin (3); the second revolving body (5) is connected into a cylinder structure with two open ends by a cooling water pipe (51) and second fins (11), and the inlet of the second revolving body (5) is in butt joint with the outlet of the first revolving body (4).
2. The multi-segment dual-source integrated soil thermal desorption device according to claim 1, wherein the cooling water pipe (51) extends spirally from upstream to downstream along the feeding direction, the first fins (3) are axially connected at intervals between the spiral pipe sections, and a cold water inlet and a hot water outlet are respectively arranged at two ends of the cooling water pipe (51).
3. The multi-section double-source integrated soil thermal desorption device according to claim 1, wherein the second revolving body (5) and the first revolving body (4) revolve synchronously.
4. A multi-section double-source integrated soil thermal desorption device according to claim 2, wherein the combustion unit comprises a burner (7) and a mixer (8), the gas side outlet of the burner (7) is connected with the gas side inlet of the mixer (8), and the gas side outlet of the mixer (8) is connected with the gas inlet of the shell (2).
5. A multi-section dual-source integrated thermal desorption device for soil according to claim 4, further comprising a preheater (6), wherein the preheater (6) has a water side inlet connected to the hot water outlet and a gas side outlet connected to the burner (7).
6. The multi-section double-source integrated soil thermal desorption device according to claim 1, wherein the feeding unit (10) adopts a double-screw type feeder, and the outlet of the double-screw type feeder is communicated with the inlet of the first revolving body (4).
7. The multi-section dual-source integrated soil thermal desorption device according to claim 1, wherein the phase change material is water.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011384793.3A CN112705563B (en) | 2020-11-30 | 2020-11-30 | Multi-section double-source integrated soil thermal desorption device |
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| CN202011384793.3A CN112705563B (en) | 2020-11-30 | 2020-11-30 | Multi-section double-source integrated soil thermal desorption device |
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| CN112705563A CN112705563A (en) | 2021-04-27 |
| CN112705563B true CN112705563B (en) | 2022-03-18 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107971330A (en) * | 2017-11-23 | 2018-05-01 | 北京建工环境修复股份有限公司 | The organic polluted soil dystopy thermal desorption repair system and method that waste heat efficiently utilizes |
| CN108817062A (en) * | 2018-06-28 | 2018-11-16 | 上海环境工程设计研究院有限公司 | Indirect thermal desorption device for organic polluted soil showering |
| CN110180881A (en) * | 2019-06-14 | 2019-08-30 | 南京中船绿洲环保有限公司 | It is a kind of to cooperate with indirect thermal desorption soil repair system and its restorative procedure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1604749B1 (en) * | 2004-06-11 | 2009-07-29 | D2G | Method and system for cleaning a soil containing contaminants |
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- 2020-11-30 CN CN202011384793.3A patent/CN112705563B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107971330A (en) * | 2017-11-23 | 2018-05-01 | 北京建工环境修复股份有限公司 | The organic polluted soil dystopy thermal desorption repair system and method that waste heat efficiently utilizes |
| CN108817062A (en) * | 2018-06-28 | 2018-11-16 | 上海环境工程设计研究院有限公司 | Indirect thermal desorption device for organic polluted soil showering |
| CN110180881A (en) * | 2019-06-14 | 2019-08-30 | 南京中船绿洲环保有限公司 | It is a kind of to cooperate with indirect thermal desorption soil repair system and its restorative procedure |
Non-Patent Citations (1)
| Title |
|---|
| "工业污泥焚烧过程中Ca(OH)_2固留重金属研究";夏志鹏等;《中国科技论文》;20171130;第12卷(第21期);第2413-2417页 * |
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