CN216540166U - Molten salt circulating type ectopic indirect thermal desorption soil remediation system - Google Patents
Molten salt circulating type ectopic indirect thermal desorption soil remediation system Download PDFInfo
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- CN216540166U CN216540166U CN202122876769.8U CN202122876769U CN216540166U CN 216540166 U CN216540166 U CN 216540166U CN 202122876769 U CN202122876769 U CN 202122876769U CN 216540166 U CN216540166 U CN 216540166U
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- molten salt
- thermal desorption
- pipe
- gas outlet
- soil remediation
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- 150000003839 salts Chemical class 0.000 title claims abstract description 103
- 238000003795 desorption Methods 0.000 title claims abstract description 50
- 239000002689 soil Substances 0.000 title claims abstract description 40
- 238000005067 remediation Methods 0.000 title claims abstract description 16
- 238000011066 ex-situ storage Methods 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims description 23
- 238000009413 insulation Methods 0.000 claims description 4
- 239000002699 waste material Substances 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 19
- 239000003546 flue gas Substances 0.000 description 14
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 13
- 238000002485 combustion reaction Methods 0.000 description 9
- 229910001220 stainless steel Inorganic materials 0.000 description 6
- 239000010935 stainless steel Substances 0.000 description 6
- 239000000446 fuel Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 239000012855 volatile organic compound Substances 0.000 description 4
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 238000005338 heat storage Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000002894 organic compounds Chemical class 0.000 description 2
- 230000002085 persistent effect Effects 0.000 description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 2
- 239000000575 pesticide Substances 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910001626 barium chloride Inorganic materials 0.000 description 1
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000035558 fertility Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000014759 maintenance of location 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
- 238000007789 sealing Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Processing Of Solid Wastes (AREA)
Abstract
The utility model discloses a molten salt circulating ex-situ indirect thermal desorption soil remediation system, and belongs to the technical field of contaminated site soil remediation. The system comprises a thermal desorption reactor, a molten salt tank and a Tesla reverse valve tail gas outlet system, wherein the output end of the molten salt tank is connected with the thermal desorption reactor sequentially through a molten salt pump and a molten salt furnace, and the output end of the thermal desorption reactor is connected with the input end of the molten salt tank; the feeding device is connected with the thermal desorption reactor, and a Tesla reverse valve is arranged in a tail gas outlet of the thermal desorption reactor. The indirect thermal desorption efficiency of the system is greatly improved, and no energy waste exists.
Description
Technical Field
The utility model belongs to the technical field of remediation of contaminated site soil, is suitable for remediation of organic contaminated site soil, and particularly relates to a fused salt circulating ex-situ indirect thermal desorption soil remediation system.
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. Thermal desorption techniques are classified into direct thermal desorption and indirect thermal desorption according to heat transfer modes, and into in-situ thermal desorption and ex-situ thermal desorption according to embodiments. The ectopic indirect thermal desorption system has the advantages of compact structure, easy realization of blocking prying, convenient transportation and the like, and is widely applied. The existing ex-situ indirect thermal desorption system adopts two modes of electric heating and high-temperature flue gas heating generated by combustion.
Application No. 201821124121.7 discloses an electrically heated indirect thermal desorption device for contaminated soil, which converts electric energy into heat energy to heat the soil; 1-degree electric energy can only generate 1kw of heat, 1-degree fuel gas or 1 liter of fuel oil can generate 10-12 kw of heat, and the industrial electricity price and the fuel gas and fuel oil prices are combined, so that the cost of electric heating conduction heating is high and uneconomical, about 300kw of heat is generally needed for completing thermal desorption reaction of one ton of soil, once the processing capacity exceeds 4 tons per hour, the electricity load exceeds more than 1000kw, the conventional power supply facilities cannot meet the requirement, and large-scale power supply facility assistance is needed, so the use scale is limited.
Application number 201920224738.4 discloses a rotary indirect thermal desorption device and system, which comprises a kiln head, a kiln tail, a rotary cylinder, a combustion chamber, a feed inlet, a discharge port and a chimney, wherein a plurality of burners are arranged in the combustion chamber outside the rotary cylinder, high-temperature flue gas generated by fuel combustion is used for heating polluted soil, and as a heating medium is flue gas, the gas-solid heat transfer efficiency is low, the discharged flue gas still carries a large amount of heat, and the energy utilization rate is low; and the flue gas density is little, and the specific heat capacity is low, and the energy that can carry by unit volume is very little, need a large amount of flue gases of delivery just can realize ideal heating effect, therefore the combustion chamber can occupy great space.
SUMMERY OF THE UTILITY MODEL
The utility model provides a molten salt circulating ex-situ indirect thermal desorption soil remediation system aiming at the defects in the prior art.
The purpose of the utility model can be realized by the following technical scheme:
a molten salt circulating ex-situ indirect thermal desorption soil remediation system comprises a thermal desorption reactor, a molten salt tank and a tail gas outlet system, wherein a molten salt heating pipe, a molten salt return pipe and a sleeve pipe positioned at a discharge end are arranged in the thermal desorption reactor, and the molten salt heating pipe is communicated with the molten salt return pipe; the inner pipe of the sleeve is communicated with the molten salt return pipe and the molten salt outlet of the rotary joint, and the jacket between the inner pipe and the outer pipe of the sleeve is communicated with the molten salt heating pipe and the molten salt inlet of the rotary joint; the output end of the molten salt tank is connected with the molten salt inlet through the molten salt pump and the molten salt furnace in sequence, and the molten salt outlet is connected with the input end of the molten salt tank; the feeding device is connected with the thermal desorption reactor, the part of the feeding device is positioned in the inner cavity of the tail gas outlet system, and the gas outlet channel of the tail gas outlet system is a reverse-arranged Tesla valve.
The technical scheme of the utility model is as follows: the purpose of the reverse arrangement of the tesla valve structure is to slow down the gas flow.
The technical scheme of the utility model is as follows: the tail end of the thermal desorption reactor is provided with a discharge end fixing cover.
The technical scheme of the utility model is as follows: the fixed end of the rotary joint is connected with the discharge end fixing cover, and the rotary end of the rotary joint is connected with the sleeve.
In the technical scheme of the utility model: a heat insulation layer is arranged around the rotary drum of the thermal desorption reactor.
A method for realizing soil remediation by using the system comprises the steps of driving molten salt with the temperature of 450-550 ℃ in a molten salt tank by a molten salt pump, conveying the molten salt into a molten salt furnace, heating the molten salt to 650-750 ℃ by smoke generated by fuel combustion, carrying out indirect heat exchange with soil through a thermal desorption reactor, cooling the molten salt to 450-550 ℃ after the heat exchange, returning the molten salt into the molten salt tank, separating moisture and organic pollutants volatilized into tail gas from solid soil, and preheating the fed soil through a Tesla reverse valve tail gas outlet system, so that a molten salt circulation heat storage heat release loop is formed, and the process that the smoke generated by fuel combustion indirectly heats the soil by using the molten salt as a main energy transmission medium is realized.
In the technical scheme of the utility model, the gas outlet system adopts a cylindrical structure and wraps the feeding device, the material of the cylinder body is heat-resistant metal, and meanwhile, the internal structure of the cylinder adopts a reversely arranged Tesla valve structure; after the high-temperature tail gas enters the Tesla reverse valve tail gas outlet system, the high-temperature tail gas exchanges heat with a central feeding device, and the soil is preheated.
In the technical scheme of the utility model, the melting temperature of the molten salt is not higher than 450 ℃, the lower limit of the use temperature is not higher than 500 ℃, the upper limit of the use temperature is not lower than 700 ℃, and the preferable formula is 21% NaCl + 31% BaCl2+48％CaCl2(the melting temperature is 435 ℃, and the using temperature is 480-750 ℃).
According to the technical scheme, the rotary drum is in a long cylindrical shape, the barrel is made of heat-resistant metal, the heat-insulating layer is coated on the outer portion of the rotary drum, the molten salt heating pipe and the molten salt backflow pipe which are fixed with the barrel and rotate along with the barrel are arranged in the rotary drum, and the sleeve pipe is located at the discharge end, so that a channel of molten salt in the rotary drum is formed.
In the technical scheme of the utility model, the central line of the molten salt heating pipe is parallel to the axial line of the rotary drum, and the molten salt heating pipe is uniformly distributed in the drum along the circumferential direction and is made of heat-resistant stainless steel.
In the technical scheme of the utility model, the central line of the molten salt reflux pipe is superposed with the axial line of the rotary drum and is made of heat-resistant stainless steel.
In the technical scheme of the utility model, the rotary joint is a connector with sealing performance, one end of the connector is fixed, the other end of the connector rotates by 360 degrees to convey a medium, the connector has temperature resistance of more than 750 ℃, the fixed end of the connector is connected with the discharge end fixing cover, and the rotating end of the connector is connected with the sleeve, so that the fused salt flowing inside and the fused salt heating pipe, the fused salt return pipe and the sleeve rotate along with the cylinder body, and the fused salt flowing inside and the pipeline fixed outside are communicated and sealed.
The utility model has the beneficial effects that:
(1) the indirect thermal desorption efficiency is greatly improved: because the efficiency of the traditional flue gas indirect heating through the stainless steel cylinder is limited by the heat transfer performance of the flue gas and the stainless steel cylinder (the heat transfer coefficient is usually only 20-30W/m2℃). And the heat transfer efficiency of the liquid molten salt and the stainless steel cylinder is high (estimated to be more than 200W/m2℃). The heat transfer performance is improved, so the efficiency of the equipment is greatly improved
(2) The traditional mode need have the clamp cover that a flue gas flows outside stainless steel barrel, and this scheme fused salt pipe does not need the flue gas to press from both sides the cover inside the rotary drum, under equal equipment size, the rotary drum size can accomplish bigger (original diameter 2m, diameter 2.4m now), and the space utilization of equipment is higher, and corresponding throughput has also promoted (directly proportional with the square of rotary drum diameter).
(3) After the traditional flue gas is fed from the jacket once, the temperature is still above 400 ℃, the flue gas is directly discharged, and energy waste exists. This scheme fused salt recycles, and the high temperature waste gas after the simultaneous processing utilizes the tesla reverse valve to preheat soil, consequently does not have the energy waste.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Figure 2 is another schematic of the system of the present invention.
FIG. 3 is a schematic view of the operation of the drum of the system of the present invention.
Fig. 4 is a schematic view of a tesla reverse valve.
Wherein: thermal desorption reactor (1), molten salt groove (2), molten salt pump (3), molten salt furnace (4), molten salt (5), tail gas outlet system (6), feeding device (7), rotary drum (8), discharge end fixing cover (9), rotary joint (10), molten salt heating pipe (11), molten salt reflux pipe (12), sleeve (13) and heat insulation layer (14)
Detailed Description
The utility model is further illustrated by the following examples, without limiting the scope of the utility model:
as shown in fig. 1 to 3, a molten salt circulating ex-situ indirect thermal desorption soil remediation system comprises a thermal desorption reactor 1, a molten salt tank 2 and a tail gas outlet system 6, wherein a molten salt heating pipe 11, a molten salt return pipe 12 and a sleeve 13 positioned at a discharge end are arranged in the thermal desorption reactor 1, and the molten salt heating pipe 11 is communicated with the molten salt return pipe 12; the inner pipe of the sleeve is communicated with the molten salt return pipe and the molten salt outlet of the rotary joint, and the jacket between the inner pipe and the outer pipe of the sleeve is communicated with the molten salt heating pipe and the molten salt inlet of the rotary joint; the output end of the molten salt tank 2 is connected with the molten salt inlet through a molten salt pump 3 and a molten salt furnace 4 in sequence, and the molten salt outlet is connected with the input end of the molten salt tank 2; the feeding device 7 is connected with the thermal desorption reactor 1, the part of the feeding device 7 is positioned in the inner cavity of the tail gas outlet system 6, and the gas outlet channel of the tail gas outlet system 6 is a reverse-arranged Tesla valve. The tail end of the thermal desorption reactor 1 is provided with a discharge end fixing cover 9. The fixed end of the rotary joint is connected with the discharge end fixing cover, and the rotary end of the rotary joint is connected with the sleeve. A heat insulation layer 14 is arranged around the rotating drum 8 of the thermal desorption reactor 1.
A method for realizing soil remediation by using the system comprises the steps of driving a molten salt 5 with the temperature of 450-550 ℃ in a molten salt tank 2 by a molten salt pump 3, conveying the molten salt into a molten salt furnace 4, heating the molten salt to 650-750 ℃ by flue gas generated by fuel combustion, carrying out indirect heat exchange with soil through a thermal desorption reactor 1, cooling the molten salt 5 to 450-550 ℃ after the heat exchange, returning the molten salt to the molten salt tank, separating moisture and organic pollutants volatilized into tail gas from solid soil, and preheating the fed soil through a Tesla reverse valve tail gas outlet system 6, so that a molten salt circulating heat storage heat release loop is formed, and the process that the flue gas generated by fuel combustion indirectly heats the soil by using the molten salt as a main energy transmission medium is realized.
Claims (4)
1. The utility model provides a circulating ectopic indirect thermal desorption soil repair system of fused salt which characterized in that: the system comprises a thermal desorption reactor (1), a molten salt tank (2) and a tail gas outlet system (6), wherein a molten salt heating pipe (11), a molten salt return pipe (12) and a sleeve (13) positioned at a discharge end are arranged in the thermal desorption reactor (1), and the molten salt heating pipe (11) is communicated with the molten salt return pipe (12); the inner pipe of the sleeve is communicated with the molten salt return pipe and the molten salt outlet of the rotary joint, and the jacket between the inner pipe and the outer pipe of the sleeve is communicated with the molten salt heating pipe and the molten salt inlet of the rotary joint; the output end of the molten salt tank (2) is connected with the molten salt inlet sequentially through the molten salt pump (3) and the molten salt furnace (4), and the molten salt outlet is connected with the input end of the molten salt tank (2); the feeding device (7) is connected with the thermal desorption reactor (1), the part of the feeding device (7) is positioned in the inner cavity of the tail gas outlet system (6), and the gas outlet channel of the tail gas outlet system (6) is a reverse arrangement Tesla valve.
2. The molten salt circulating ex-situ indirect thermal desorption soil remediation system of claim 1, wherein: the tail end of the thermal desorption reactor (1) is provided with a discharge end fixing cover (9).
3. The molten salt circulating ex-situ indirect thermal desorption soil remediation system of claim 2, wherein: the fixed end of the rotary joint is connected with the discharge end fixing cover, and the rotary end of the rotary joint is connected with the sleeve.
4. The molten salt circulating ex-situ indirect thermal desorption soil remediation system of claim 1, wherein: a heat insulation layer (14) is arranged around the rotating drum (8) of the thermal desorption reactor (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122876769.8U CN216540166U (en) | 2021-11-22 | 2021-11-22 | Molten salt circulating type ectopic indirect thermal desorption soil remediation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122876769.8U CN216540166U (en) | 2021-11-22 | 2021-11-22 | Molten salt circulating type ectopic indirect thermal desorption soil remediation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216540166U true CN216540166U (en) | 2022-05-17 |
Family
ID=81577158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122876769.8U Expired - Fee Related CN216540166U (en) | 2021-11-22 | 2021-11-22 | Molten salt circulating type ectopic indirect thermal desorption soil remediation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216540166U (en) |
-
2021
- 2021-11-22 CN CN202122876769.8U patent/CN216540166U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220517 |