CN106424112B - Multi-stage thermal desorption process and equipment for waste salt refining - Google Patents
Multi-stage thermal desorption process and equipment for waste salt refining Download PDFInfo
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- CN106424112B CN106424112B CN201610953100.5A CN201610953100A CN106424112B CN 106424112 B CN106424112 B CN 106424112B CN 201610953100 A CN201610953100 A CN 201610953100A CN 106424112 B CN106424112 B CN 106424112B
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- 150000003839 salts Chemical class 0.000 title claims abstract description 120
- 239000011780 sodium chloride Substances 0.000 title claims abstract description 118
- 238000003795 desorption Methods 0.000 title claims abstract description 68
- 239000002699 waste material Substances 0.000 title claims abstract description 59
- 238000007670 refining Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title abstract description 34
- 238000010438 heat treatment Methods 0.000 claims abstract description 60
- 229920002456 HOTAIR Polymers 0.000 claims abstract description 47
- 239000007789 gas Substances 0.000 claims description 20
- 239000002245 particle Substances 0.000 claims description 20
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 5
- 239000003345 natural gas Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 abstract 1
- 239000002920 hazardous waste Substances 0.000 description 33
- 230000000694 effects Effects 0.000 description 16
- 239000000575 pesticide Substances 0.000 description 11
- 239000002912 waste gas Substances 0.000 description 9
- 239000010815 organic waste Substances 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 7
- 239000002689 soil Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000003912 environmental pollution Methods 0.000 description 4
- 239000005416 organic matter Substances 0.000 description 4
- 238000004043 dyeing Methods 0.000 description 3
- 238000007639 printing Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000002588 toxic Effects 0.000 description 3
- 231100000331 toxic Toxicity 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000001808 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000005039 chemical industry Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001590 oxidative Effects 0.000 description 1
- 238000006864 oxidative decomposition reaction Methods 0.000 description 1
- 238000005020 pharmaceutical industry Methods 0.000 description 1
- 238000004064 recycling Methods 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
Abstract
The invention discloses multistage thermal desorption equipment for waste salt refining, which comprises a primary hot air heating furnace, a primary rotary kiln, a secondary hot air heating furnace, a secondary rotary kiln, a feeder and an induced draft fan, wherein the top of the primary rotary kiln is provided with a feeding port and a feeder, the bottom of the primary rotary kiln is connected to the feeder of the secondary rotary kiln through a pipeline, the bottom of the secondary rotary kiln is provided with a discharging port, an air outlet of the secondary hot air heating furnace is connected to the bottom of the secondary rotary kiln, an air inlet of the secondary hot air heating furnace is provided with a pipeline connected with the top of the primary rotary kiln, an air outlet of the primary hot air heating furnace is connected to the bottom of the primary rotary kiln, and an air inlet of the primary hot air heating furnace is provided with; the device and the process provided by the invention are mainly used for refining the waste salt, the structure is simple, the thermal desorption efficiency of the organic matters is high, the gas generated by thermal desorption is recycled, no tail gas is generated for treatment, no atmospheric pollution is caused, and the economic benefit and the environmental benefit win-win.
Description
Technical Field
The invention relates to the technical field of treatment of hazardous waste salt generated in the industries of pesticide, medicine, printing and dyeing and the like, in particular to a multistage thermal desorption process and equipment for refining waste salt.
Background
At present, the industries such as coal chemical industry, pesticide, dye and the like in China generate a large amount of polluted salt, the annual output is measured by millions of tons, and a proper treatment way is lacked. The waste salt contains a large amount of toxic and harmful organic matters and has pungent odor, and the waste salt is generally regarded as hazardous waste by local environmental protection departments. At present, the related national departments list dangerous waste salt generated in the pesticide industry into dangerous waste lists and directly use the dangerous waste as dangerous solid waste without identification. Because of no clear standard or guide method, the production amount is large, the types are multiple, the components are complex, and the processing difficulty is large, so that the environmental protection problem to be solved urgently in the industry is solved.
In recent years, the problem of hazardous waste salts has also attracted high government and social attention. The waste salt as a byproduct of the pesticide is the largest solid waste in the pesticide industry, contains various toxic and harmful substances and has complex components. Meanwhile, the water content is high, the caking is easy, and the effective treatment and utilization are difficult to obtain. The salt is an important chemical raw material and is an extremely precious national strategic resource, and the recycling of the waste salt as the industrial raw material can not only eliminate the pollution to the environment, but also make full use of the precious salt resource to recycle the byproduct and realize the circular economy.
In the aspect of hazardous waste salt treatment, a common technology is an incineration technology, namely, under a high-temperature condition, organic matters in the hazardous waste salt are decomposed, gasified and oxidized, and finally serious toxic and harmful substances are removed under the high-temperature condition. The method is an effective and feasible technology for treating the dangerous waste salt, and the existing treatment method in the market adopts high-temperature treatment technologies such as an incinerator, a rotary kiln and the like. However, these techniques also have a series of problems in practical application, which mainly appear in the following aspects:
1) the hazardous waste salt is bonded on the inner wall of the equipment, so that the equipment cannot be used. The hazardous waste salt has a certain water content, is easy to adhere to the inner wall of equipment under the action of high temperature when entering equipment such as an incinerator, a rotary kiln and the like, has complex components in the decomposition process of organic matters, can generate sticky organic matters in the reaction process, can enable the hazardous waste salt to be more firmly adhered to the inner wall of the equipment, cannot be manually cleaned, and finally causes the insufficient space of the equipment, and the equipment cannot be reused, so that the final waste of the equipment is caused;
2) heating is not uniform, and the treatment efficiency is low. When equipment such as an incinerator, a rotary kiln and the like is reused for incineration, the equipment adopts a local heating mode during heating, and all dangerous waste salt is heated to a set temperature through the heat conduction effect. The heating mode can cause uneven heating temperature of the dangerous waste salt, cause the phenomenon of overhigh local temperature or overhigh local temperature, finally cause incomplete decomposition of organic matters in the dangerous waste salt, can not thoroughly oxidize and decompose the organic matters, and cause poor treatment effect.
Patent CN201510063379.5 discloses a multistage thermal desorption repair system of organic contaminated soil, it mainly adopts is that two-stage thermal desorption handles, carry out thermal desorption to organic contaminated soil and handle, but combine its technical scheme to see, its thermal desorption produces a large amount of organic waste gas, these waste gas need carry out tail gas treatment and waste heat application, this needs to add tail gas processing apparatus and waste heat and recycles the device, manufacturing cost greatly increased, and because there is certain difference in the technological condition of the thermal desorption of soil thermal desorption and the technological condition of the thermal desorption of waste salt granule, in-process at thermal desorption, if adopt the mode of organic waste gas circulation heating, the organic waste gas of production is probably adsorbed in soil again, cause secondary pollution, cause the purifying effect variation of final product soil.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a multistage thermal desorption apparatus and an industry for waste salt refining, which has a simple structure, high organic matter thermal desorption efficiency, cyclic utilization of gas generated by thermal desorption, and low energy consumption.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the utility model provides a multistage thermal desorption equipment for waste salt is refined, equipment include one-level hot air heating furnace, one-level rotary kiln, second grade hot air heating furnace, second grade rotary kiln, charging means and draught fan, the top of one-level rotary kiln be equipped with charge door and charging means, the bottom of one-level rotary kiln is passed through the tube coupling and is on the charging means of second grade rotary kiln, the bottom of second grade rotary kiln is equipped with the discharge gate, the bottom at the second grade rotary kiln is connected to the gas outlet of second grade hot air heating furnace, be equipped with the top of tube coupling one-level rotary kiln on the air inlet of second grade hot air heating furnace, the gas outlet of one-level hot air heating furnace connect the bottom at one-level rotary kiln, be equipped with the top that pipeline and draught fan.
The air inlets of the primary hot air heating furnace and the secondary hot air heating furnace are respectively provided with a heating air connector; the heating gas connector is connected with combustible gas, so that combustion is conveniently carried out in the hot air heating furnace, and heat is provided for the gas.
A connecting pipe of the primary rotary kiln and the secondary hot blast stove is provided with a gas emptying pipe and a moisture exhaust fan; after the organic matter is burnt, certain water can be generated and is discharged through the gas emptying pipe and the moisture exhaust fan, so that the stability of waste salt particles in a system is ensured.
The invention provides a multistage thermal desorption process for refining waste salt, which comprises the following steps:
1) introducing air into a primary hot blast furnace, heating to 100-200 ℃, and introducing air from the bottom of the primary rotary kiln; and (3) carrying out primary drying on the dangerous waste salt to increase the fluidity of the salt.
2) Adding waste salt particles from the top of the primary rotary kiln through a feeder, allowing the waste salt particles to stay in the primary rotary kiln for a period of time and then reach the bottom of the primary rotary kiln, allowing the waste salt particles to enter the secondary rotary kiln through a pipeline and the feeder, and introducing airflow generated at the top of the primary rotary kiln into a secondary hot air heating furnace; in the air heating process, volatile organic waste gas generated in the thermal desorption process in the primary rotary kiln is introduced into the secondary hot air heating furnace for oxidation and incineration, so that a part of combustible materials are provided, and meanwhile, air pollution is avoided.
3) The second-stage hot air heating furnace heats hot air to 300-600 ℃, and the hot air is introduced from the bottom of the second-stage rotary kiln: and the secondary rotary kiln is used for carrying out high-temperature oxidation thermal desorption on the salt primarily dried in the primary rotary kiln again, and fully carrying out oxidative decomposition on organic matters in the dangerous waste salt to obtain the salt without the organic matters.
4) After the waste salt particles stay for a period of time, the waste salt particles reach the bottom of the secondary rotary kiln and are discharged through a discharge hole, and airflow generated at the top of the secondary rotary kiln is introduced into a primary hot air heating furnace; the waste gas generated by thermal desorption in the secondary rotary kiln is combusted, so that atmospheric pollution is avoided.
5) In solid particles discharged from a discharge port at the bottom of the secondary rotary kiln, the concentration of organic matters is not more than 10 ppm; and detecting and analyzing the obtained solid particles, judging whether a rotary kiln with three or more stages is arranged according to the content of the organic matters in the treated salt, and finally enabling the organic matters in the treated salt to be smaller than the content of the organic matters in the standard of the chlor-alkali salt, namely enabling the concentration of the organic matters to be smaller than 10 ppm. .
In the operation process of the step 5), when the concentration of organic matters in solid particles discharged from a discharge hole of the secondary rotary kiln exceeds 10ppm, a tertiary rotary kiln and a tertiary hot air heating furnace are required to be additionally arranged below the secondary rotary kiln.
The primary hot air heating furnace and the secondary hot air heating furnace are both heated by natural gas.
The preferable heating temperature of the primary hot air heating furnace is 150-200 ℃; the preferable heating temperature of the secondary hot air heating furnace is 300-500 ℃.
In the step 2) process, the retention time of the waste salt particles in the primary rotary kiln is 30-120 min.
In the process of the step 4), the retention time of the waste salt particles in the secondary rotary kiln is 60-120 min.
The invention has the advantages that:
1) adopts a hot air heating mode. In the invention, the dangerous waste salt is subjected to thermal desorption in a hot air mode for the first time, and is treated in a multi-stage thermal desorption mode. Firstly, performing primary thermal desorption on the dangerous waste salt, mainly removing water in the dangerous waste salt, performing primary drying, and increasing the fluidity of the salt; and then, performing secondary high-temperature thermal desorption on the salt subjected to the primary thermal desorption treatment, and thoroughly removing, decomposing and oxidizing organic matters in the dangerous waste salt to achieve the purpose of refining.
2) Effectively solves the problem of waste gas pollution in the treatment process of the hazardous waste salt. In the process of thermal desorption of the hazardous waste salt, organic matters in the hazardous waste salt are removed in a volatile organic waste gas mode, so that a large amount of volatile organic waste gas can be generated in the treatment process. In the invention, the natural gas heating furnace in the process is skillfully utilized to burn and treat the volatile organic waste gas generated in the thermal desorption process. The technology saves the investment and the operation cost of the waste gas treatment device on one hand; on the other hand, the volatile organic waste gas can be used as an organic matter and also can be used as a fuel to provide certain combustion heat. Therefore, the problem of waste gas pollution is solved in the process flow, the design is ingenious, and the innovation is remarkable.
3) The high-temperature hot air and the dangerous waste salt form convection, and the heat transfer effect is improved. In the thermal desorption of danger waste salt, adopt hot-blast heating methods, in the heating process, hot-blast and danger waste salt form the convection current state, and hot-blast space between the waste salt that can pass through like this will be hot-blast accessible space with heat transfer for danger waste salt, increase its heated area, increase thermal transfer effect.
4) Can set up multistage rotary kiln stack according to the concentration of organic matter in the useless salt of danger. In the patent of the invention, the equipment can be flexibly adjusted. The effect of dangerous waste salt treatment can be analyzed and measured after the first-stage rotary kiln and the second-stage rotary kiln, the requirement is met according to the indexes of organic matters in the dangerous waste salt, the stage number of the rotary kiln can be increased or reduced, and energy is saved on the premise that the dangerous waste salt is well treated.
5) Can solve the problem of hardening. In the process, first-stage thermal desorption is carried out to remove water in the dangerous waste salt, so that the fluidity of the salt can be increased, and the hardening problem can be reduced. In the subsequent treatment process, the occurrence of hardening is avoided, and the defects in the prior art are effectively overcome.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention.
Wherein, 1 one-level rotary kiln, 2 second-level rotary kilns, 3 one-level hot air heating furnace, 4 second-level hot air heating furnace, 5, 6 feeders, 7 draught fans, 8 moisture removing fans, 9 feed inlets, 10 discharge outlets.
Detailed Description
The invention is described in further detail below with reference to the following description of the drawings and the detailed description.
Example 1: the refined hazardous waste salt in the experiment is evaporated crystal salt from a certain pesticide factory in Shandong, and belongs to typical hazardous waste salt. The pesticide contains a large amount of pesticide organic matters, and has great danger to the environment. The thermal desorption treatment process of the hazardous waste salt mainly removes organic matters in the hazardous waste salt, so the experiment mainly focuses on the effect of removing the organic matters in the hazardous waste salt. The experimental procedures and experimental effects are shown in table 1.
Table 1 experimental procedure and experimental effect for refining hazardous waste salt
As can be seen from the experimental data in Table 2, the initial organic concentration in the hazardous waste salt is 472 mg/L. In the first-stage thermal desorption treatment, the temperature of the first-stage thermal desorption is set to be 150 ℃, the thermal desorption time is set to be 30min, the concentration of organic matters in the obtained salt is 158mg/L, and the removal rate of the organic matters is 66.5%; in the secondary thermal desorption treatment, the temperature of the secondary thermal desorption is set to be 350 ℃, the thermal desorption time is set to be 90min, the concentration of organic matters in the obtained salt is 13mg/L, the removal rate of the organic matters reaches 97.2%, most of the organic matters are removed, and the concentration of the organic matters in the salt reaches the standard of chlor-alkali salt. Through the treatment process, one ton of refined salt is obtained, and the cost is about 300 yuan. In the whole process, waste gas generated in the first-stage rotary kiln and the second-stage rotary kiln is combusted in the process, so that no extra atmospheric treatment cost is generated, and no atmospheric environmental pollution is caused.
Example 2: the refined hazardous waste salt in the experiment is evaporated crystal salt from a certain pesticide factory in Shandong, and belongs to typical hazardous waste salt. The pesticide contains a large amount of pesticide organic matters, and has great danger to the environment. The thermal desorption treatment process of the hazardous waste salt mainly removes organic matters in the hazardous waste salt, so the experiment mainly focuses on the effect of removing the organic matters in the hazardous waste salt. The experimental procedures and experimental effects are shown in table 2.
TABLE 2 Experimental procedure and effect for refining hazardous waste salt
As can be seen from the experimental data in Table 2, the initial organic concentration in the hazardous waste salt is 472 mg/L. In the first-stage thermal desorption treatment, the temperature of the first-stage thermal desorption is set to be 200 ℃, the thermal desorption time is set to be 30min, the concentration of organic matters in the obtained salt is 114mg/L, and the removal rate of the organic matters is 75.8%; in the secondary thermal desorption treatment, the temperature of the secondary thermal desorption is set to be 400 ℃, the thermal desorption time is set to be 60min, the concentration of organic matters in the obtained salt is 8mg/L, the removal rate of the organic matters reaches 98.3%, most of the organic matters are removed, and the concentration of the organic matters in the salt reaches the standard of chlor-alkali salt. Through the treatment process, one ton of refined salt is obtained, and the cost is about 300 yuan. In the whole process, waste gas generated in the first-stage rotary kiln and the second-stage rotary kiln is combusted in the process, so that no extra atmospheric treatment cost is generated, and no atmospheric environmental pollution is caused.
Example 3: the hazardous waste salt refined in the experiment is from the hazardous waste salt produced in certain printing and dyeing industry of Hongyun harbor, contains a large amount of organic matters, and has great danger to the environment. The refining experiment is carried out by utilizing hazardous waste salt in the printing and dyeing industry. The experimental procedures and experimental effects are shown in table 3.
TABLE 3 Experimental procedure and effect for refining hazardous waste salt
As can be seen from the experimental data in Table 2, the initial organic concentration in the hazardous waste salt is 878 mg/L. In the first-stage thermal desorption treatment, the temperature of the first-stage thermal desorption is set to be 200 ℃, the thermal desorption time is set to be 40min, the concentration of organic matters in the obtained salt is 345mg/L, and the removal rate of the organic matters is 60.7%; in the secondary thermal desorption treatment, the temperature of the secondary thermal desorption is set to be 500 ℃, the thermal desorption time is set to be 90min, the concentration of organic matters in the obtained salt is 6mg/L, the removal rate of the organic matters reaches 99.3%, most of the organic matters are removed, and the concentration of the organic matters in the salt reaches the standard of chlor-alkali salt. Through the treatment process, one ton of refined salt is obtained, and the cost is about 300 yuan. In the whole process, waste gas generated in the first-stage rotary kiln and the second-stage rotary kiln is combusted in the process, so that extra atmospheric treatment cost is not generated, atmospheric environmental pollution is not caused, and economic benefit and environmental benefit win-win.
Example 4: in the experiment, the dangerous waste salt is generated by a certain pharmaceutical company in the Lianyuan harbor industrial park, contains a large amount of high molecular organic matters and has high toxicity. The refining experiment is carried out by utilizing the hazardous waste salt in the pharmaceutical industry. The experimental procedures and experimental effects are shown in table 4.
Table 4 experimental steps and experimental effects for refining hazardous waste salts
As can be seen from the experimental data in Table 4, the initial organic concentration in the hazardous waste salt is 1689 mg/L. In the first-stage thermal desorption treatment, the temperature of the first-stage thermal desorption is set to be 150 ℃, the thermal desorption time is set to be 30min, the concentration of organic matters in the obtained salt is 1025mg/L, and the removal rate of the organic matters is 39.3%; in the secondary thermal desorption treatment, the temperature of the secondary thermal desorption is set to be 350 ℃, the thermal desorption time is 90min, the concentration of organic matters in the obtained salt is 256mg/L, and the removal rate of the organic matters reaches 84.8%; because the content of organic matters in the salt after the two-stage thermal desorption is higher, the third-stage thermal desorption is needed, the temperature of the third-stage thermal desorption is set to be 400 ℃, the thermal desorption time is set to be 90min, the concentration of the organic matters in the obtained salt is 4mg/L, most of the organic matters are removed at the moment, and the concentration of the organic matters in the salt reaches the standard of the chlor-alkali salt. Through the treatment process, one ton of refined salt is obtained, and the cost is about 350 yuan. In the whole process, waste gas generated in the first-stage rotary kiln, the second-stage rotary kiln and the third-stage rotary kiln is combusted in the process, so that no extra atmospheric treatment cost is generated, and no atmospheric environmental pollution is caused.
It should be noted that the above-mentioned embodiments are merely preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and any combination or equivalent changes made on the basis of the above-mentioned embodiments are also within the scope of the present invention.
Claims (7)
1. The production process of the multistage thermal desorption equipment for refining the waste salt is characterized in that the equipment comprises a first-stage hot air heating furnace, a first-stage rotary kiln, a second-stage hot air heating furnace, a second-stage rotary kiln, a feeder and an induced draft fan, wherein the top of the first-stage rotary kiln is provided with a feeding port and the feeder, the bottom of the first-stage rotary kiln is connected to the feeder of the second-stage rotary kiln through a pipeline, the bottom of the second-stage rotary kiln is provided with a discharge port, an air outlet of the second-stage hot air heating furnace is connected to the bottom of the second-stage rotary kiln, the air inlet of the second-stage hot air heating furnace is provided with a pipeline connected to the top of the first-stage rotary kiln, and the air inlet of the first-stage hot air heating furnace is provided; when the concentration of organic matters in solid particles discharged from a discharge hole of the secondary rotary kiln exceeds 10ppm, a tertiary rotary kiln and a tertiary hot air heating furnace are additionally arranged below the secondary rotary kiln; the production process comprises the following steps:
1) introducing air into a primary hot blast furnace, heating to 100-200 ℃, and introducing air from the bottom of the primary rotary kiln;
2) adding waste salt particles from the top of the primary rotary kiln through a feeder, allowing the waste salt particles to stay in the primary rotary kiln for a period of time and then reach the bottom of the primary rotary kiln, allowing the waste salt particles to enter the secondary rotary kiln through a pipeline and the feeder, and introducing airflow generated at the top of the primary rotary kiln into a secondary hot air heating furnace;
3) the second-stage hot air heating furnace heats hot air to 300-600 ℃, and the hot air is introduced from the bottom of the second-stage rotary kiln:
4) after the waste salt particles stay for a period of time, the waste salt particles reach the bottom of the secondary rotary kiln and are discharged through a discharge hole, and airflow generated at the top of the secondary rotary kiln is introduced into a primary hot air heating furnace;
5) the concentration of organic matters in solid particles discharged from a discharge hole at the bottom of the secondary rotary kiln is not more than 10 ppm.
2. The production process of the multistage thermal desorption equipment for refining waste salt according to claim 1, wherein the air inlets of the first-stage hot air heating furnace and the second-stage hot air heating furnace are respectively provided with a heating gas connecting port.
3. The production process of the multistage thermal desorption equipment for waste salt refining as claimed in claim 1, wherein a gas emptying pipe and a moisture exhaust fan are arranged on a connecting pipe of the first-stage rotary kiln and the second-stage hot blast stove.
4. The production process of the multistage thermal desorption equipment for waste salt refining as claimed in claim 1, wherein the primary hot air heating furnace and the secondary hot air heating furnace are both heated by natural gas.
5. The production process of the multistage thermal desorption equipment for refining the waste salt according to claim 1, wherein the heating temperature of the primary hot air heating furnace is 150-200 ℃; the heating temperature of the secondary hot air heating furnace is 300-500 ℃.
6. The production process of the multistage thermal desorption equipment for waste salt refining as claimed in claim 1, wherein in the step 2), the residence time of the waste salt particles in the first-stage rotary kiln is 30-120 min.
7. The production process of the multistage thermal desorption equipment for waste salt refining as claimed in claim 1, wherein in the step 4), the residence time of the waste salt particles in the secondary rotary kiln is 60-120 min.
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| CN107128951B (en) * | 2017-06-22 | 2019-07-12 | 南京诚朴环保科技有限公司 | A kind of method of organic matter in removing inorganic salts |
| CN109940036A (en) * | 2017-12-20 | 2019-06-28 | 北京中毅工程科技有限公司 | Soil restoring device and method |
| CN113048489A (en) * | 2021-03-16 | 2021-06-29 | 上海蓄科环境工程有限公司 | Method and system for purifying and recycling industrial salt from waste salt containing organic matters |
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| CN104014578B (en) * | 2014-05-23 | 2015-12-02 | 邵军 | A kind of discarded organic decomposition technique of Nacl |
| CN104344407B (en) * | 2014-09-12 | 2016-10-12 | 浙江东天虹环保工程有限公司 | A kind of industrial waste salt dregs innocent treatment method |
| CN104310434B (en) * | 2014-11-10 | 2016-08-31 | 上海力脉环保设备有限公司 | A kind of device for processing abraum salt and technique |
| CN104607455B (en) * | 2015-02-06 | 2016-11-16 | 中国科学院武汉岩土力学研究所 | A kind of organic polluted soil Multi-stage heat desorption repair system |
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Application publication date: 20170222 Assignee: Yancheng Guotou Environmental Technology Co.,Ltd. Assignor: NANJING G+W ENVIRONMENT ENGINEERING Co.,Ltd. Contract record no.: X2021980001429 Denomination of invention: A multistage thermal desorption process and equipment for waste salt refining Granted publication date: 20191231 License type: Exclusive License Record date: 20210304 |