CN111380060A - Chemical waste salt harmless treatment system and method - Google Patents
Chemical waste salt harmless treatment system and method Download PDFInfo
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- CN111380060A CN111380060A CN202010204412.2A CN202010204412A CN111380060A CN 111380060 A CN111380060 A CN 111380060A CN 202010204412 A CN202010204412 A CN 202010204412A CN 111380060 A CN111380060 A CN 111380060A
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
- F23G5/027—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment pyrolising or gasifying stage
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/50—Control or safety arrangements
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Abstract
The invention relates to a chemical waste salt harmless treatment system and a method, which comprises a material proportioning granulation system, a thermal decomposition system, an evaporation concentration system and a material collection system which are sequentially connected, wherein the thermal decomposition system is communicated with a tail gas treatment system, the material proportioning granulation system at least comprises a batching storage tank and a granulator, the thermal decomposition system at least comprises a pyrolysis furnace and a microwave cracking furnace which are mutually communicated, the evaporation concentration system comprises a first-stage concentration evaporator, a second-stage concentration evaporator and a third-stage concentration evaporator which are sequentially communicated, the tail gas treatment system comprises a multistage circulating combustion device and a waste gas absorption tower which are mutually connected, and air outlets of the pyrolysis furnace and the microwave cracking furnace are communicated with an inlet of the tail gas treatment system. The chemical waste salt harmless treatment system provided by the invention can be used for treating and recycling waste salt, and the aim of harmless recycling of resources is fulfilled.
Description
Technical Field
The invention relates to the technical field of hazardous waste treatment, in particular to a chemical waste salt harmless treatment system and a chemical waste salt harmless treatment method.
Background
In recent years, cases of illegal treatment and disposal of hazardous wastes frequently occur, and the cases attract extensive attention of all social circles. Many of the cases relate to the treatment and disposal of hazardous wastes, especially waste slag and salt, in the chemical industry. The waste has the characteristics of wide sources, various types, complex components, high content of toxic and harmful substances and the like. Not only is the environmental hazard great, but also in the face of increasingly strict treatment and disposal requirements and environmental management policies, the treatment and disposal requirements and the cost are continuously increased, so the treatment difficulty is very great, and the method becomes one of the main problems to be solved urgently in the current environmental protection industry.
The salt is also an important chemical raw material, and if the waste salt in the chemical industry can be subjected to harmless and recycling treatment and reused as an industrial raw material or other purposes in the form of byproducts, the harm to the environment can be eliminated, the waste salt resource can be fully utilized, and the waste recycling and recycling economy of the chemical industry can be realized.
However, since some waste salts cannot be treated, if they are not treated effectively, they enter the environment and cause serious environmental pollution, so it is necessary to design a system for harmless treatment of waste salts.
Disclosure of Invention
Based on the above, the invention aims to solve the problem that in the prior art, the existing part of waste salt enters the environment due to incomplete treatment, so that serious environmental pollution is caused.
The invention provides a chemical waste salt innocent treatment system, which comprises a material proportioning granulation system, a thermal decomposition system, an evaporation concentration system and a material collection system which are sequentially connected, wherein the thermal decomposition system is communicated with a tail gas treatment system, the material proportioning granulation system at least comprises a batching storage tank and a granulator, the thermal decomposition system at least comprises a pyrolysis furnace and a microwave cracking furnace which are mutually communicated, the evaporation concentration system comprises a primary concentration evaporator, a secondary concentration evaporator and a tertiary concentration evaporator which are sequentially communicated, the tail gas treatment system comprises a multi-stage circulating combustion device and a waste gas absorption tower which are mutually connected, air outlets of the pyrolysis furnace and the microwave cracking furnace are both communicated with an inlet of the tail gas treatment system, the chemical waste salt innocent treatment system is used for batching and granulating waste salt, and pyrolyzing the raw materials in the pyrolysis furnace and the microwave pyrolysis furnace to decompose organic compounds, conveying the combusted inorganic mixed salt to the evaporation and concentration system for evaporation and crystallization, and conveying the obtained industrial salt to the material collection system.
The invention provides a chemical waste salt harmless treatment system, which comprises a material proportioning granulation system, a thermal decomposition system, an evaporation concentration system and a material collection system which are sequentially connected, wherein the thermal decomposition system is communicated with a tail gas treatment system, in practical application, the materials are proportioned according to the type of waste salt, then the materials are granulated in a granulator to obtain particle mixed salt, the particle mixed salt is dried and then sequentially passes through a pyrolysis furnace and a microwave cracking furnace to carry out oxidative decomposition on organic matters in the particle mixed salt, the generated waste gas enters the tail gas treatment system to be combusted, the inorganic mixed salt obtained after decomposition is sent into the evaporation concentration system to be dissolved, and is sequentially evaporated and concentrated by a first-stage concentration evaporator, a second-stage concentration evaporator and a third-stage concentration evaporator to obtain industrial salt coarse materials, and finally the industrial salt coarse materials are conveyed into the material collection system, crystallizing and separating by a crystallizing separator, centrifuging, and storing in a crystallizing storage tank to obtain the final product. The chemical waste salt harmless treatment system provided by the invention can be used for treating and recycling waste salt, and the aim of harmless recycling of resources is fulfilled.
Chemical industry waste salt innocent treatment system, wherein, material ratio granulation system still includes carries the conveyer, carry the conveyer, the batching storage tank and the granulator connects gradually, the discharge gate of granulator with thermal decomposition system's feed inlet is linked together.
Chemical industry waste salt innocent treatment system, wherein, the pyrolysis system including the drying-machine that connects gradually the pyrolysis oven microwave pyrolysis oven and rubbing crusher the top air outlet of drying-machine is equipped with first trap the top air outlet of pyrolysis oven is equipped with the second trap the top air outlet of microwave pyrolysis oven is equipped with the third trap, first trap the second trap and the third trap all with tail gas processing system links to each other.
Chemical industry waste salt innocent treatment system, wherein, be equipped with first vapor jet compressor between the first order concentrated evaporimeter with the second grade concentrated evaporimeter, the bottom and the first material delivery pump of first order concentrated evaporimeter are connected, the second grade concentrated evaporimeter with be equipped with the second vapor jet compressor between the third grade concentrated evaporimeter, the bottom and the second material delivery pump of second grade concentrated evaporimeter are connected, the bottom and the third material delivery pump of third grade concentrated evaporimeter are connected, the discharge end of third grade concentrated evaporimeter with material collection system links to each other.
Chemical industry waste salt innocent treatment system, wherein, material collecting system is including the crystallization separator, centrifuge and the crystallization storage tank that connect gradually, the feed end of crystallization separator with the discharge end of tertiary concentrated evaporimeter links to each other.
Chemical industry waste salt innocent treatment system, wherein, multistage circulating combustion device is including the flue gas deep combustion ignition and the burning gas circulation burner of intercommunication each other, flue gas deep combustion ignition pass through airtight long tube with it is linked together to burn gas circulation burner.
Chemical industry waste salt innocent treatment system, wherein, the pyrolysis oven is air fluidized bed pyrolysis oven, the waste gas absorption tower is the active carbon absorption tower.
The invention also provides a chemical waste salt harmless treatment method, wherein the method comprises the following steps:
the method comprises the following steps: conveying industrial waste salt to a batching storage tank through a lifting conveyor, batching according to the category of the industrial waste salt, uniformly mixing the batching, and conveying the mixed batching to a granulator for granulation treatment;
step two: after being sent into a dryer for drying, the granulated mixed salt is sequentially decomposed at high temperature by a pyrolysis furnace and a microwave cracking furnace so as to carry out oxidative decomposition on organic matters in the granulated mixed salt, and the generated waste gas enters a tail gas treatment system through a first catcher, a second catcher and a third catcher for combustion treatment;
step three: feeding inorganic mixed salt obtained after decomposition in a pyrolysis furnace and a microwave cracking furnace into an evaporation concentration system for dissolution, and carrying out evaporation concentration in a primary concentration evaporator, a secondary concentration evaporator and a tertiary concentration evaporator in sequence to obtain industrial salt coarse material;
step four: conveying the industrial salt coarse material to a material collecting system, carrying out crystallization separation by a crystallization separator, centrifuging, and storing in a crystallization storage tank to obtain a finished product.
The chemical waste salt harmless treatment method comprises the following steps that in the second step, the drying temperature in the dryer is 60-80 ℃;
the step of performing pyrolysis in the pyrolysis furnace comprises: controlling the temperature in the pyrolysis furnace to be 100-150 ℃ for pre-pyrolysis for 30min at the early stage, then heating to 450-500 ℃ for pyrolysis for 60min, and naturally cooling to room temperature;
the step of performing pyrolysis in the microwave pyrolysis furnace comprises: controlling the nitrogen filling consumption range in the microwave cracking furnace to be 0.05-0.08 m3And/min, controlling the microwave cracking temperature to be 110-130 ℃, and performing microwave cracking for 60 min.
The chemical waste salt harmless treatment method is characterized in that after the third step, the method further comprises the following steps:
and detecting the carbon content in the industrial salt coarse material, and if the carbon content exceeds the specification, introducing the industrial salt coarse material into a carbonization furnace for carbonization treatment.
Additional features and advantages of the disclosure will be set forth in the description which follows, or in part may be learned by the practice of the above-described techniques of the disclosure, or may be learned by practice of the disclosure.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
FIG. 1 is a schematic view of the overall structure of a chemical waste salt innocent treatment system according to a first embodiment of the invention;
FIG. 2 is a schematic structural diagram of a material proportioning and granulating system in the chemical waste salt harmless treatment system shown in FIG. 1;
FIG. 3 is a schematic structural diagram of a thermal decomposition system in the chemical waste salt innocent treatment system shown in FIG. 1;
FIG. 4 is a schematic structural diagram of a tail gas treatment system in the chemical waste salt harmless treatment system shown in FIG. 1;
FIG. 5 is a schematic structural diagram of an evaporation concentration system in the chemical waste salt innocent treatment system shown in FIG. 1;
fig. 6 is a schematic structural diagram of a material collecting system in the chemical waste salt innocent treatment system shown in fig. 1.
Description of the main symbols:
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The existing part of waste salt cannot be treated, and if the waste salt is not effectively treated, the waste salt enters the environment to cause serious environmental pollution, so that a system for performing harmless treatment on the waste salt is needed to be designed.
In order to solve the technical problem, the present invention provides a chemical waste salt innocent treatment system, please refer to fig. 1 to 6, which comprises a material proportioning granulation system 11, a thermal decomposition system 21, an evaporation concentration system 41 and a material collection system 51, which are connected in sequence, wherein the thermal decomposition system 21 is communicated with an exhaust gas treatment system 31.
Referring to fig. 2, the material proportioning and granulating system 11 includes a lifting and conveying machine 111, a blending storage tank 112 and a granulator 113 connected in sequence. In this embodiment, the discharge port of the pelletizer 113 is communicated with the feed port of the thermal decomposition system 21. In practice, industrial waste salt is added to the batching tank 112 by the above mentioned elevator 111. The staff prepares burden according to the kind of waste salt to carry out even compounding. In addition, the mixed material obtained after mixing is conveyed to a granulator 113 for granulation treatment, and a large amount of granular mixed salt is obtained. As can be understood, the granular mixed salt is prepared, which is convenient for the decomposition of organic matters in the subsequent high-temperature combustion process.
Referring to fig. 3, the pyrolysis system 21 includes a dryer 211, a pyrolysis furnace 212, a microwave cracking furnace 213, and a crusher 214 connected in sequence. As shown in fig. 3, a first trap 2111 is disposed at the top outlet of the dryer 211, a second trap 2121 is disposed at the top outlet of the pyrolysis furnace 212, and a third trap 2131 is disposed at the top outlet of the microwave pyrolysis furnace 213. In practical applications, the first trap 2111, the second trap 2121 and the third trap 2131 are all connected to the exhaust gas treatment system 31. It is understood that the first trap 2111 is used for collecting the exhaust gas in the dryer 211, the second trap 2121 is used for collecting the exhaust gas in the pyrolysis furnace 212, and the third trap 2131 is used for collecting the exhaust gas in the microwave pyrolysis furnace 213, and is uniformly delivered to the tail gas treatment system 31 for the cyclic combustion treatment, so as to avoid environmental pollution. It is also necessary to supplement here that the pyrolysis furnace 212 described above is an air fluidized bed pyrolysis furnace.
Referring to fig. 4, regarding the above-mentioned tail gas treatment system 31, the tail gas treatment system 31 includes a multi-stage circulating combustion device 311 and a waste gas absorption tower 312 connected to each other, wherein the outlets of the pyrolysis furnace 212 and the microwave cracking furnace 213 are both communicated with the inlet of the tail gas treatment system 31. Specifically, the multistage circulating combustion device 311 includes a deep combustion ignition device 3111 and a circulating combustion device 3112 for incinerating flue gas, which are communicated with each other, and the deep combustion ignition device 3111 is communicated with the circulating combustion device 3112 for incinerating flue gas through a sealed long pipe. In this embodiment, the waste gas absorption tower 312 is an activated carbon absorption tower.
Referring to fig. 5, the evaporation concentration system 41 includes a first-stage concentration evaporator 411, a second-stage concentration evaporator 412 and a third-stage concentration evaporator 413 which are sequentially connected. Specifically, a first vapor jet compressor 4112 is provided between the first-stage concentration evaporator 411 and the second-stage concentration evaporator 412, and the bottom of the first-stage concentration evaporator 411 is connected to a first material transfer pump 4111. Further, a second vapor jet compressor 4122 is provided between the second-stage concentration evaporator 412 and the third-stage concentration evaporator 413, and the bottom of the second-stage concentration evaporator 412 is connected to a second material transfer pump 4121. The bottom of the third concentrating evaporator 413 is connected to a third material transfer pump 4131, and the discharge end of the third concentrating evaporator 413 is connected to the material collecting system 51.
Referring to fig. 6, the material collection system 51 includes a crystallization separator 511, a centrifuge 512 and a crystallization storage tank 513 connected in sequence. As can be seen from fig. 1, the feed end of the crystallization separator 511 is connected to the discharge end of the above-mentioned three-stage concentration evaporator 413.
The invention provides a chemical waste salt harmless treatment system, which comprises a material proportioning granulation system, a thermal decomposition system, an evaporation concentration system and a material collection system which are sequentially connected, wherein the thermal decomposition system is communicated with a tail gas treatment system, in practical application, the materials are proportioned according to the type of waste salt, then the materials are granulated in a granulator to obtain particle mixed salt, the particle mixed salt is dried and then sequentially passes through a pyrolysis furnace and a microwave cracking furnace to carry out oxidative decomposition on organic matters in the particle mixed salt, the generated waste gas enters the tail gas treatment system to be combusted, the inorganic mixed salt obtained after decomposition is sent into the evaporation concentration system to be dissolved, and is sequentially evaporated and concentrated by a first-stage concentration evaporator, a second-stage concentration evaporator and a third-stage concentration evaporator to obtain industrial salt coarse materials, and finally the industrial salt coarse materials are conveyed into the material collection system, crystallizing and separating by a crystallizing separator, centrifuging, and storing in a crystallizing storage tank to obtain the final product. The chemical waste salt harmless treatment system provided by the invention can be used for treating and recycling waste salt, and the aim of harmless recycling of resources is fulfilled.
The invention also provides a chemical waste salt harmless treatment method, wherein the method comprises the following steps:
the method comprises the following steps of (I), conveying industrial waste salt to a batching storage tank through a lifting conveyor, batching according to the category of the industrial waste salt, uniformly mixing the materials, and conveying the mixed materials to a granulator for granulation treatment.
In the step, batch detection is required according to the industrial waste salt, and the ingredients are pertinently prepared after the category is determined, so that pollutants which are difficult to treat in the waste salt are eliminated as far as possible. Then transferred to a granulator for granulation.
And (II) after the granulated mixed salt is sent into a dryer to be dried, the granulated mixed salt is sequentially decomposed at high temperature by a pyrolysis furnace and a microwave cracking furnace so as to oxidize and decompose the organic matters in the granulated mixed salt, and the generated waste gas enters a tail gas treatment system through a first catcher, a second catcher and a third catcher to be subjected to combustion treatment.
In this step, the drying temperature in the dryer is set to 60 to 80 ℃ when the granulated mixed salt is granulated. After the drying operation is finished, the dried particle mixed salt is conveyed to a pyrolysis furnace for high-temperature pyrolysis, so that organic matters in the particle mixed salt are eliminated to a great extent. Specifically, when high-temperature pyrolysis is carried out, the temperature in the pyrolysis furnace is controlled to be 100-150 ℃ firstly, pre-pyrolysis is carried out for 30min at the early stage, then the temperature is raised to 450-500 ℃ for pyrolysis for 60min, and then natural cooling is carried out to the room temperature.
Furthermore, since the elimination of organic substances in the particle-mixed salt is not completely guaranteed after the pyrolysis is carried out, the elimination of organic substances is further aimed atDeep decomposition can be carried out by adopting a microwave cracking mode. Specifically, after feeding, controlling the nitrogen filling consumption range in the microwave cracking furnace to be 0.05-0.08 m3And/min, controlling the microwave pyrolysis temperature to be 110-130 ℃, performing microwave pyrolysis for 60min, and then naturally cooling to room temperature. And finally, crushing the mixture by a crusher to obtain powdery salt.
It is necessary to supplement that a certain amount of exhaust gas is generated during the drying, pyrolysis and microwave pyrolysis processes. In order to avoid air pollution, the exhaust gas is uniformly collected into an exhaust gas treatment system through the first catcher, the second catcher and the third catcher respectively for cyclic combustion treatment.
And (III) feeding the inorganic mixed salt obtained after decomposition in the pyrolysis furnace and the microwave pyrolysis furnace into an evaporation concentration system for dissolution, and carrying out evaporation concentration in sequence in a first-stage concentration evaporator, a second-stage concentration evaporator and a third-stage concentration evaporator to obtain the industrial salt coarse material.
In this step, the separation by evaporation concentration is carried out according to the solubility of the salt at different temperatures. If the separation is not complete, redissolving and evaporating to concentrate and separate until a single industrial salt is separated.
It is added here that in order to ensure that the quality of the final single salt product meets the industrial requirements, it is necessary to ensure that the carbon content in the particulate mixed salt after pyrolysis and microwave pyrolysis is sufficiently low. In contrast, the carbon content in the industrial salt coarse material needs to be detected, and if the carbon content exceeds a specified value, the industrial salt coarse material is introduced into a carbonization furnace for carbonization treatment.
And (IV) conveying the industrial salt coarse material to a material collecting system, carrying out crystallization separation by a crystallization separator, centrifuging, and storing in a crystallization storage tank to obtain a finished product.
By the chemical waste salt harmless treatment system provided by the invention, the pilot plant test conditions are as follows:
(1) pilot scale: 1 ton/day (50 kg/h);
(2) the main components of the waste salt are as follows: sodium chloride, a small amount of sodium sulfate and high-boiling organic matters;
(3) the operation mode is as follows: continuously;
(4) preheating and drying temperature: 60-80 ℃;
(5) consumption of nitrogen gas: 0.05m3/min
The pilot test results are shown in the following table:
| item | Heavy metal content of treated salt residue | Organic matter content of treated salt residue | Concentration of tail gas |
| Parameter value | Less than 0.1mg/kg | Less than 0.001% | Reach the standard |
From the above table, it can be seen that the chemical waste salt harmless treatment system and the corresponding treatment method provided by the invention can enable the treated waste salt to be no longer toxic and harmful, and can be recycled.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A chemical waste salt innocent treatment system is characterized by comprising a material proportioning granulation system, a thermal decomposition system, an evaporation concentration system and a material collection system which are sequentially connected, wherein the thermal decomposition system is communicated with a tail gas treatment system, the material proportioning granulation system at least comprises a proportioning storage tank and a granulator, the thermal decomposition system at least comprises a pyrolysis furnace and a microwave cracking furnace which are mutually communicated, the evaporation concentration system comprises a first-stage concentration evaporator, a second-stage concentration evaporator and a third-stage concentration evaporator which are sequentially communicated, the tail gas treatment system comprises a multi-stage circulating combustion device and a waste gas absorption tower which are mutually connected, air outlets of the pyrolysis furnace and the microwave cracking furnace are both communicated with an inlet of the tail gas treatment system, and the chemical waste salt innocent treatment system is used for proportioning and granulating waste salt, and pyrolyzing the raw materials in the pyrolysis furnace and the microwave pyrolysis furnace to decompose organic compounds, conveying the combusted inorganic mixed salt to the evaporation and concentration system for evaporation and crystallization, and conveying the obtained industrial salt to the material collection system.
2. The chemical waste salt innocent treatment system of claim 1, wherein the material proportioning and granulating system further comprises a lifting and conveying machine, the batching storage tank and the granulator are sequentially connected, and a discharge hole of the granulator is communicated with a feed inlet of the thermal decomposition system.
3. The chemical waste salt innocent treatment system of claim 2, wherein the thermolysis system comprises a dryer, the pyrolysis furnace, the microwave pyrolysis furnace and a pulverizer which are connected in sequence, a first trap is arranged at an air outlet at the top of the dryer, a second trap is arranged at an air outlet at the top of the pyrolysis furnace, a third trap is arranged at an air outlet at the top of the microwave pyrolysis furnace, and the first trap, the second trap and the third trap are all connected with the tail gas treatment system.
4. The chemical waste salt innocent treatment system of claim 1, wherein a first steam jet compressor is arranged between the first-stage concentration evaporator and the second-stage concentration evaporator, the bottom of the first-stage concentration evaporator is connected with a first material conveying pump, a second steam jet compressor is arranged between the second-stage concentration evaporator and the third-stage concentration evaporator, the bottom of the second-stage concentration evaporator is connected with a second material conveying pump, the bottom of the third-stage concentration evaporator is connected with a third material conveying pump, and the discharge end of the third-stage concentration evaporator is connected with the material collecting system.
5. The chemical waste salt harmless treatment system according to claim 4, wherein the material collection system comprises a crystallization separator, a centrifuge and a crystallization storage tank which are connected in sequence, and a feed end of the crystallization separator is connected with a discharge end of the three-stage concentration evaporator.
6. The chemical waste salt harmless treatment system according to claim 1, wherein the multistage circulating combustion device comprises a flue gas deep combustion ignition device and an incineration flue gas circulating combustion device which are communicated with each other, and the flue gas deep combustion ignition device is communicated with the incineration flue gas circulating combustion device through a closed long pipe.
7. The chemical waste salt harmless treatment system according to claim 1, wherein the pyrolysis furnace is an air fluidized bed pyrolysis furnace, and the waste gas absorption tower is an activated carbon absorption tower.
8. A chemical waste salt harmless treatment method is characterized by comprising the following steps:
the method comprises the following steps: conveying industrial waste salt to a batching storage tank through a lifting conveyor, batching according to the category of the industrial waste salt, uniformly mixing the batching, and conveying the mixed batching to a granulator for granulation treatment;
step two: after being sent into a dryer for drying, the granulated mixed salt is sequentially decomposed at high temperature by a pyrolysis furnace and a microwave cracking furnace so as to carry out oxidative decomposition on organic matters in the granulated mixed salt, and the generated waste gas enters a tail gas treatment system through a first catcher, a second catcher and a third catcher for combustion treatment;
step three: feeding inorganic mixed salt obtained after decomposition in a pyrolysis furnace and a microwave cracking furnace into an evaporation concentration system for dissolution, and carrying out evaporation concentration in a primary concentration evaporator, a secondary concentration evaporator and a tertiary concentration evaporator in sequence to obtain industrial salt coarse material;
step four: conveying the industrial salt coarse material to a material collecting system, carrying out crystallization separation by a crystallization separator, centrifuging, and storing in a crystallization storage tank to obtain a finished product.
9. The method for harmless treatment of chemical waste salt according to claim 8, wherein in the second step, the drying temperature in the dryer is 60 ℃ to 80 ℃;
the step of performing pyrolysis in the pyrolysis furnace comprises: controlling the temperature in the pyrolysis furnace to be 100-150 ℃ for pre-pyrolysis for 30min at the early stage, then heating to 450-500 ℃ for pyrolysis for 60min, and naturally cooling to room temperature;
the step of performing pyrolysis in the microwave pyrolysis furnace comprises: controlling the nitrogen filling consumption range in the microwave cracking furnace to be 0.05-0.08 m3And/min, controlling the microwave cracking temperature to be 110-130 ℃, and performing microwave cracking for 60 min.
10. The method for harmless treatment of chemical waste salt according to claim 8, wherein after the third step, the method further comprises:
and detecting the carbon content in the industrial salt coarse material, and if the carbon content exceeds the specification, introducing the industrial salt coarse material into a carbonization furnace for carbonization treatment.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113501533A (en) * | 2021-06-23 | 2021-10-15 | 天津长芦汉沽盐场有限责任公司 | Treatment method of sodium sulfate waste salt obtained in tetrabromobisphenol A production |
| CN114472474A (en) * | 2022-01-06 | 2022-05-13 | 山东绿满神州环境科技有限公司 | Industrial waste salt recycling treatment system and method |
| CN114985429A (en) * | 2022-05-23 | 2022-09-02 | 中国科学院生态环境研究中心 | Low-temperature aerobic pyrolysis purification recycling method for waste salt |
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