CN116839043A - Industrial waste salt treatment system and process - Google Patents
Industrial waste salt treatment system and process Download PDFInfo
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- CN116839043A CN116839043A CN202310808043.1A CN202310808043A CN116839043A CN 116839043 A CN116839043 A CN 116839043A CN 202310808043 A CN202310808043 A CN 202310808043A CN 116839043 A CN116839043 A CN 116839043A
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- salt
- melting furnace
- industrial waste
- rotary kiln
- pyrolysis
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- 150000003839 salts Chemical class 0.000 title claims abstract description 273
- 239000002440 industrial waste Substances 0.000 title claims abstract description 135
- 238000011282 treatment Methods 0.000 title claims abstract description 96
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000002844 melting Methods 0.000 claims abstract description 141
- 230000008018 melting Effects 0.000 claims abstract description 140
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 69
- 239000003546 flue gas Substances 0.000 claims abstract description 69
- 238000000197 pyrolysis Methods 0.000 claims abstract description 60
- 238000000926 separation method Methods 0.000 claims abstract description 31
- 239000007921 spray Substances 0.000 claims description 46
- 238000012432 intermediate storage Methods 0.000 claims description 45
- 239000007789 gas Substances 0.000 claims description 39
- 238000001816 cooling Methods 0.000 claims description 36
- 239000000047 product Substances 0.000 claims description 27
- 239000000110 cooling liquid Substances 0.000 claims description 24
- 238000003860 storage Methods 0.000 claims description 22
- 239000000428 dust Substances 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 8
- 239000012265 solid product Substances 0.000 claims description 7
- 238000009833 condensation Methods 0.000 claims description 6
- 230000005494 condensation Effects 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 238000012958 reprocessing Methods 0.000 claims description 5
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 238000007790 scraping Methods 0.000 claims description 3
- 239000000779 smoke Substances 0.000 claims description 3
- 238000003723 Smelting Methods 0.000 claims description 2
- 238000010298 pulverizing process Methods 0.000 claims description 2
- 238000000151 deposition Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 9
- 238000012546 transfer Methods 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 25
- 238000007599 discharging Methods 0.000 description 14
- 239000002699 waste material Substances 0.000 description 13
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 12
- 239000012535 impurity Substances 0.000 description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000002994 raw material Substances 0.000 description 7
- 239000003345 natural gas Substances 0.000 description 6
- 239000000498 cooling water Substances 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical group [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 239000006229 carbon black Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000002920 hazardous waste Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000011033 desalting Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 229910017053 inorganic salt Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000011221 initial treatment Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000009279 wet oxidation reaction Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
- F23G5/033—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment comminuting or crushing
-
- 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
- F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
- F23G5/14—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion
- F23G5/16—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion in a separate combustion chamber
-
- 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
- F23G5/20—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having rotating or oscillating drums
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2201/00—Pretreatment
- F23G2201/30—Pyrolysing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2201/00—Pretreatment
- F23G2201/60—Separating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2201/00—Pretreatment
- F23G2201/80—Shredding
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2202/00—Combustion
- F23G2202/10—Combustion in two or more stages
- F23G2202/103—Combustion in two or more stages in separate chambers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2203/00—Furnace arrangements
- F23G2203/20—Rotary drum furnace
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides an industrial waste salt treatment system and a process, wherein the treatment system comprises a pyrolysis module, an intermediate treatment module and a melting module, the pyrolysis module comprises a rotary kiln, and the industrial waste salt is subjected to preliminary pyrolysis; the intermediate treatment module comprises a separation device, separates the primary product into coarse salt and fine salt, breaks the coarse salt and sends the coarse salt to the rotary kiln; the melting module comprises a melting furnace, and the separating device conveys fine salt into the melting furnace; the melting furnace is internally provided with a burner, a plurality of secondary air nozzles and a salt outlet, flue gas in the melting furnace moves tangentially around the furnace wall along the axial direction of the melting furnace, and the salt outlet is arranged at the bottom of the melting furnace. According to the industrial waste salt treatment system and the industrial waste salt treatment process, the industrial waste salt is subjected to pyrolysis-separation-melting procedures, TOC is initially reduced and then enters the melting furnace, full mass transfer effect occurs in the melting furnace, TOC is deeply removed, TOC of the industrial waste salt is reduced to below 5ppm, the product quality is greatly improved, and further collection and treatment are facilitated.
Description
Technical Field
The invention relates to an industrial waste salt treatment system and an industrial waste salt treatment process.
Background
The generation of a large amount of waste salt in industrial production is one of main sources of industrial solid waste or hazardous waste, and the disposal and utilization of the waste salt are always focused on in the industrial field. Most of industrial waste salts are classified as dangerous waste due to different impurity contents and high hazard degree, and are not properly disposed at present, so that a large environmental protection pressure is brought.
The treatment mode of the hazardous waste type industrial waste salt in the prior art is similar to that of the traditional hazardous waste, and mainly comprises incineration and landfill, wherein the landfill is mostly temporary landfill, so that a large amount of land is occupied, environmental pollution is caused in the long term, and the problem of utilizing the industrial waste salt cannot be fundamentally solved. However, the adoption of incineration disposal can cause the inorganic salt to be molten, so that the high-temperature refractory material is severely corroded, meanwhile, the molten inorganic salt can be entrained by flue gas, the flue gas can be cooled and crystallized in subsequent treatment equipment, equipment and pipelines are blocked, and most incineration disposal units are reluctant to receive and dispose of dangerous waste industrial waste salt.
In view of the above, more advanced solutions are needed for the recycling and harmless utilization of industrial waste salts. The prior technical proposal is mainly divided into two steps of organic impurity removal and inorganic impurity removal, wherein the industrial processes of ion membrane brine refining and the like in the inorganic impurity removal step have more mature technological processes which can be referred and referred, and the organic impurity removal step is the key point and the difficult point of recycling and harmlessness of the industrial waste salt at present. The existing organic impurity removal scheme comprises different types of disc heating volatilization, wet oxidation method, rotary kiln anaerobic pyrolysis, high-temperature melting and the like, and the total organic carbon (Total Organic Carbon, TOC for short) in the treated industrial waste salt is different from about tens ppm to hundreds ppm.
In the prior art, the TOC content in the product obtained by treating the industrial waste salt by the high-temperature melting method is the lowest, but the characteristics of high hardness, difficult crushing and the like of the product obtained by treating the industrial waste salt by the high-temperature melting method make the downstream difficult to be further dissolved and utilized, the salt in the molten salt flue gas is inconvenient to treat, and the existing high-temperature melting method treatment system has the defects of extremely high energy consumption, lower heat efficiency, limited applicable industrial waste salt types and larger improvement space.
Disclosure of Invention
The invention aims to overcome the defects of high TOC content and the like of a processed product of an industrial waste salt processing system in the prior art, and provides the industrial waste salt processing system and the industrial waste salt processing process.
The invention solves the technical problems by the following technical proposal:
the invention provides a treatment system of industrial waste salt, which is characterized by comprising a pyrolysis module, an intermediate treatment module and a melting module;
the pyrolysis module comprises a rotary kiln and is used for pyrolyzing the industrial waste salt into a primary product and pyrolysis gas;
the intermediate treatment module comprises a separation device which is connected with the rotary kiln and is used for separating the preliminary product into coarse salt and fine salt and sending the coarse salt back into the rotary kiln after being crushed;
the melting module comprises a melting furnace, and the separation device is connected with the melting furnace and is used for conveying the fine salt into the melting furnace;
the utility model discloses a smelting furnace, including the melting furnace, be equipped with combustor, a plurality of overgrate air nozzle and salt outlet in the melting furnace, the combustor is established the top of melting furnace, the overgrate air nozzle is established on the middle section oven of melting furnace to be tangential setting along the oven, be used for making flue gas in the melting furnace is followed the axial of melting furnace is around the tangential motion of the oven of melting furnace, the salt outlet sets up the bottom of melting furnace.
In the technical scheme, the industrial waste salt firstly enters a rotary kiln for preliminary pyrolysis, water and partial organic matters are removed, and TOC is primarily reduced; the pyrolyzed industrial waste salt enters a separation device, and the separated crude salt returns to a rotary kiln for re-pyrolysis; the separated fine salt enters a melting furnace through a burner, and the flue gas is tangentially moved through air inlet of a secondary air nozzle, so that the fine salt and the flue gas have full mass transfer effect in the process of flowing downwards in the furnace, the deep removal of TOC in the industrial waste salt is realized, and the TOC of the industrial waste salt is reduced to below 5ppm; the treated industrial waste salt naturally passes through the salt outlet under the action of gravity and leaves the melting furnace, so that the waste salt is convenient to collect and further treat.
Preferably, the pyrolysis module further comprises a first bin and a feeding device which are sequentially connected along the moving direction of the industrial waste salt, wherein the feeding device is connected with the rotary kiln, and the feeding device can be controlled in a variable frequency manner and is used for controlling the feeding amount of the rotary kiln; and a pyrolysis gas pipeline is arranged between the rotary kiln and the melting furnace and used for delivering pyrolysis gas in the rotary kiln to the melting furnace for combustion.
In the technical scheme, the quantity of the industrial waste salt entering the rotary kiln is controllable, so that the industrial waste salt is uniformly and effectively treated all the time; organic matters in the industrial waste salt are heated and cracked into combustible micromolecular gas and simple substance carbon black in the rotary kiln, and the combustible micromolecular gas and the simple substance carbon black are converted into water vapor impurity water in the waste salt to form pyrolysis gas, and the pyrolysis gas is sent into a melting furnace to be combusted, so that the organic matters in the pyrolysis gas can be fully utilized, and the overall energy consumption of a treatment system is reduced.
Preferably, the burner is a cyclone burner, the secondary air nozzles are symmetrically distributed around the axial direction of the melting furnace, and the number of the secondary air nozzles is 4 or 8.
In the technical scheme, industrial waste salt enters the furnace through the cyclone burner, secondary air blown out by the secondary air nozzles which are tangentially and symmetrically arranged forms tangential motion, and mass transfer effect is fully generated with flue gas in the downward flowing process in the melting furnace, so that TOC is deeply removed.
Preferably, the treatment system further comprises a tail gas treatment module, and the tail gas treatment module is connected with the melting furnace; the tail gas treatment module comprises a spray cylinder, the spray cylinder is a cylinder, a water curtain is arranged in the spray cylinder, a spray head is arranged on the inner surface of the top of the spray cylinder, and when the spray head works, cooling liquid is sprayed out of the inner space and the inner wall of the spray cylinder; the bottom of the spray cylinder is provided with a cooling liquid outlet, and the outer wall of the spray cylinder is annularly provided with a water-cooling jacket.
In the technical scheme, high-temperature flue gas in the melting furnace enters the tail gas treatment module, the water curtain in the spray cylinder enables the flue gas to be rapidly cooled, and the spray head cleans condensed industrial waste salt attached to the inner wall of the spray cylinder through cooling liquid sprayed out of the inner wall of the spray cylinder, so that the inside of the spray cylinder is ensured to be unobstructed; the cooling liquid leaves the spraying cylinder through a cooling liquid outlet arranged at the bottom of the spraying cylinder and can be used for the subsequent treatment of industrial waste salt; the water cooling jacket keeps the temperature of the spray cylinder shell balanced, so that the industrial waste salt is uniformly cooled.
Preferably, a flue gas outlet is arranged on the spray cylinder, and a first flue gas pipeline is arranged between the flue gas outlet and the rotary kiln and used for sending part of flue gas generated by the melting furnace back to the rotary kiln; a salt powder dust remover is arranged between the flue gas outlet and the first flue gas pipeline; an air inlet is arranged on the melting furnace, and a second flue gas pipeline is arranged between the air inlet and the rotary kiln; the heat exchange mode of the rotary kiln is dividing wall type heat exchange;
the melting module further comprises a primary fan, and the primary fan is connected with the air inlet; and a heat exchanger is arranged between the primary fan and the air inlet, the second flue gas pipeline is connected with the heat exchanger, and the flue gas subjected to heat exchange in the rotary kiln is sent into the heat exchanger to perform non-contact heat exchange with air.
In the technical scheme, the high-temperature flue gas which enters the spray cylinder for desalting and dedusting and is subjected to primary cooling is sent to the rotary kiln for heat exchange, and air sent to the melting furnace by the primary fan is further preheated after flowing out of the rotary kiln, so that the relative humidity of the air is reduced, the phenomenon that the industrial waste salt is damped due to precipitation after water vapor in the primary air contacts with the pyrolyzed industrial waste salt is prevented, meanwhile, the waste heat of the high-temperature flue gas is effectively utilized, and the overall heat efficiency of the treatment system is improved; meanwhile, the dividing wall type heat exchange isolates the flue gas and the rotary kiln, so that the influence on industrial waste salt in the rotary kiln is avoided; residual salt in the flue gas flowing out of the flue gas outlet is adsorbed and collected by the salt powder dust remover, so that only flue gas entering the first flue gas pipeline is enabled to be the flue gas, and the comprehensive yield of the treatment system is improved.
Preferably, the intermediate treatment module further comprises a cooling device, a conveying device and an intermediate storage tank which are sequentially connected along the movement direction of the industrial waste salt, and a discharge hole of the intermediate storage tank is connected with the separation device.
In the technical scheme, the industrial waste salt subjected to pyrolysis preliminary treatment is sent to a cooling device for cooling, then sent to an intermediate storage tank by a conveying device, and separated into coarse salt and fine salt by a separation device for subsequent collection and treatment respectively.
Preferably, the intermediate storage tank comprises a first intermediate storage tank and a second intermediate storage tank which are arranged in parallel, the bottoms of the first intermediate storage tank and the second intermediate storage tank are provided with discharge ports, and the conveying equipment is communicated with the first intermediate storage tank or the second intermediate storage tank;
the separation device also comprises a second bin, and is provided with a coarse salt outlet and a fine salt outlet; the fine salt outlet is sequentially connected with the second bin and the melting furnace; the second storage bin is provided with a heating device, and the heating device is used for enabling the temperature of air in the second storage bin to be higher than the ambient temperature; the crude salt outlet is connected with the rotary kiln through a pulverizer and a crude salt pipeline in sequence and is used for pulverizing crude salt separated by the separation device and then sending the pulverized crude salt into the rotary kiln for reprocessing; the outside of cooling equipment, conveying equipment, first intermediate storage tank and second intermediate storage tank all is equipped with the water-cooling jacket.
In the technical scheme, the conveying equipment can adjust the running direction, after one intermediate storage tank is filled, the direction can be adjusted, the industrial waste salt after pyrolysis treatment is conveyed to the other intermediate storage tank, and a discharge hole at the bottom of the filled intermediate storage tank is opened to realize discharge in the tank; the separation device separates the industrial waste salt after pyrolysis into coarse salt and fine salt, and the coarse salt is sent to the rotary kiln again for treatment, so that the quality of the industrial waste salt entering the melting furnace is ensured, and meanwhile, the intermediate treatment module is isolated from the outside, so that the tightness of the treatment system is improved; the heating device is arranged in the second storage bin, so that the relative humidity of the air in the second storage bin is maintained at a lower level, the precipitation of water in the air is effectively inhibited, and the dryness of the industrial waste salt in the second storage bin is ensured; the cooling equipment, the conveying equipment, the first intermediate storage tank and the second intermediate storage tank are provided with water-cooling jackets, so that the industrial waste salt in the cooling equipment, the conveying equipment, the first intermediate storage tank and the second intermediate storage tank can be effectively and uniformly cooled.
Preferably, the melting module further comprises a discharging and conveying device, and the bottom of the melting furnace is connected with the discharging and conveying device through the salt outlet.
In the technical scheme, after being treated in the melting furnace, the industrial waste salt enters the discharging and conveying device through the salt outlet and is sent out of the melting furnace and collected for subsequent processing and utilization.
Preferably, the discharging and conveying device comprises a condensing device and a discharging and conveying device, wherein a scraper is arranged in the condensing device and is used for scraping the solidified product on the inner surface of the condensing device and enabling the solidified product to fall onto the discharging and conveying device; the inside of condensation equipment is equipped with conduction oil cooling structure, the outside of condensation equipment is equipped with conduction oil cooler, conduction oil cooler with conduction oil cooling structure forms conduction oil circulation loop.
In this technical scheme, condensation equipment is through conduction oil circulation heat dissipation for the industry salt that falls into condensation equipment obtains effectual and even cooling, is scraped to fall to the ejection of compact conveying equipment again after it solidifies and is carried the collection.
The invention also provides a treatment process of industrial waste salt, which uses the treatment system, and comprises the following steps:
the TOC of the industrial waste salt entering the treatment system is 200 ppm-20000 ppm, the industrial waste salt enters the pyrolysis module, the pyrolysis module is fed into the rotary kiln for pyrolysis and then is divided into pyrolysis gas and preliminary products, the preliminary products enter the intermediate treatment module, the temperature in the rotary kiln is kept at 350-550 ℃, the pressure in the rotary kiln is 0-2 kPa, and the residence time of the industrial waste salt in the rotary kiln is 0.5-3 h;
the primary product enters the separation device and is separated into coarse salt and fine salt, the coarse salt returns to the rotary kiln for reprocessing, the fine salt enters the melting furnace, the temperature in the melting furnace is kept between 850 and 1200 ℃, the pressure in the melting furnace is between-5 and 3kPa, and the residence time of the industrial waste salt in the melting furnace is between 0.5 and 3 minutes; the particle size of the crude salt is larger than 0.3mm; fine salt enters the melting furnace from the upper part and is combusted and melted through the burner and the secondary air nozzle to generate smoke and solid products; the TOC of the solid product is preferably less than 5ppm; more preferably, the operating temperature of the melting furnace is kept higher than 950 ℃, the residence time of the industrial waste salt in the melting furnace is less than 1.5min, the pressure in the melting furnace is-1 to 1kPa, and the TOC of solid products is less than 2ppm. In the technical scheme, the industrial waste salt is sequentially subjected to the procedures of pyrolysis, separation and melting, and the TOC of the final product is reduced to below 5ppm by the industrial waste salt treatment system, so that the product quality is greatly improved, and the subsequent utilization treatment is facilitated.
On the basis of conforming to the common knowledge in the field, the above preferred conditions can be arbitrarily combined to obtain the preferred examples of the invention.
The invention has the positive progress effects that:
according to the industrial waste salt treatment system and the industrial waste salt treatment process, the industrial waste salt is sequentially subjected to the procedures of pyrolysis, separation and melting, water and part of organic matters are removed, TOC is primarily reduced and then enters the melting furnace, and a sufficient mass transfer effect is generated in the melting furnace, so that the deep removal of TOC in the industrial waste salt is realized, the TOC of the industrial waste salt is reduced to below 5ppm, and the product quality is greatly improved; meanwhile, different types of industrial waste salts can be treated, namely single salt and mixed salt can be treated, and the universality of the system is improved.
Drawings
FIG. 1 is a schematic diagram of an industrial waste salt treatment system according to the present invention.
Description of the reference numerals
A raw material salt bucket elevator 1;
a first silo 2;
raw material salt feeding dragon 3;
feeding dragon 4 of the rotary kiln;
a rotary kiln 5, a flue gas tail treatment device 51 and a pyrolysis gas pipeline 52;
a cooling device 6;
a conveying device 7;
an intermediate tank 8, a first intermediate tank 81, a second intermediate tank 82;
a separation device 9;
a middle dragon 10;
a pyrolytic salt bucket elevator 11;
a second silo 12;
a second bin bottom dragon 13;
a dust remover 14;
a discharge ash bucket 15;
a pyrolysis gas fan 16;
a primary air blower 17;
a heat exchanger 18;
a secondary air blower 19;
melting furnace 20, burner 201, condensing equipment 202, secondary air nozzle 203, natural gas delivery station 204;
a heat-conducting oil cooler 21;
a outfeed conveyor apparatus 22;
a discharge bin 23;
spray cylinder 24, shower head 241;
a salt dust remover 25, a first flue gas duct 251, a second flue gas duct 252;
a cooling liquid circulation device 26;
a coolant circulation pump 27;
cooling water supply 101, cooling water return 102, air flow path 103, nitrogen flow path 104, crude salt flow path 105 and salt dissolving system flow path 106;
solid flow paths S1 to S7;
gas flow paths G1 to G12;
cooling liquid channels DW 1-DW 4, an atomized cooling liquid channel DW5 and a water curtain cooling liquid channel DW6;
cooling OIL flow paths OIL1 to OIL2.
Detailed Description
The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention.
Example 1
An embodiment of the industrial waste salt treatment system of the present invention is shown in fig. 1. The treatment system of the industrial waste salt comprises a pyrolysis module, an intermediate treatment module and a melting module; the pyrolysis module comprises a rotary kiln 5 for pyrolyzing the industrial waste salt into a primary product and pyrolysis gas; the intermediate treatment module comprises a separation device 9, wherein the separation device 9 is connected with the rotary kiln 5 and is used for separating the primary product into coarse salt and fine salt, the separation device 9 is connected with the rotary kiln 5 and is used for crushing the coarse salt and then sending the crushed coarse salt back into the rotary kiln 5; the melting module comprises a melting furnace 20, and a separation device 9 is connected with the melting furnace 20 and is used for conveying fine salt into the melting furnace 20; the melting furnace 20 is internally provided with a burner 201, a plurality of overgrate air nozzles 203 and a salt outlet, the burner 201 is arranged at the top of the melting furnace 20, the overgrate air nozzles 203 are arranged on the middle furnace wall of the melting furnace 20 and are tangentially arranged along the furnace wall, the flue gas in the melting furnace 20 is used for tangentially moving around the furnace wall of the melting furnace 20 along the axial direction of the melting furnace 20, and the salt outlet is arranged at the bottom of the melting furnace 20. Firstly, the industrial waste salt enters a rotary kiln 5 for preliminary pyrolysis, water and partial organic matters are removed, and TOC is primarily reduced; the pyrolyzed industrial waste salt enters a separation device 9, and the separated crude salt returns to the rotary kiln 5 for re-pyrolysis; the separated fine salt enters the melting furnace 20 through the burner 201 together with air blown in by the primary fan 17 and natural gas provided by the natural gas delivery station 204, and the natural gas is combusted in the melting furnace 20 to generate high-temperature flue gas, so that the temperature in the melting furnace 20 is kept at 950 ℃; the secondary air is pressurized and blown in by the secondary air blower 19 and enters the melting furnace 20 through the secondary air nozzle 203 to make the flue gas move tangentially, so that molten salt is attached to the inner surface of the melting furnace 20 in the process of moving along with the flue gas, and the molten salt and the flue gas have full mass transfer effect in the process of flowing downwards along the furnace, thereby realizing the deep removal of TOC in industrial waste salt; the treated industrial waste salt naturally passes through the salt outlet under the action of gravity and leaves the melting furnace 20, so that the waste salt is convenient to collect and further treat.
In other embodiments, if the TOC content of the feedstock salt is low, the feedstock salt may be fed directly into the melting furnace 20 without passing through the pyrolysis module.
The pyrolysis module further comprises a first feed bin 2 and a feeding device which are sequentially connected along the moving direction of the industrial waste salt, wherein the feeding device is connected with the rotary kiln 5, and the feeding device can be controlled in a variable frequency manner and is used for controlling the feeding amount of the rotary kiln 5; a pyrolysis gas pipeline 52 is arranged between the rotary kiln 5 and the melting furnace 20 and is used for delivering pyrolysis gas in the rotary kiln 5 to the melting furnace 20 for combustion, the pyrolysis gas is pumped by a pyrolysis gas fan 16, leaves the rotary kiln 5 from the pyrolysis gas pipeline 52, removes dust in the pyrolysis gas by a dust remover 14 and enters the melting furnace 20; the dust remover 14 is a cyclone dust remover, and can also be other types of dust removing devices; a discharge ash bucket 15 is connected below the smoke dust remover 14; the feeding device comprises a raw material salt feeding dragon 3 and a rotary kiln feeding dragon 4 which are sequentially connected, industrial waste salt is lifted to a first storage bin 2 through a raw material salt bucket elevator 1, and the industrial waste salt in the first storage bin 2 is sent to the rotary kiln feeding dragon 4 through the raw material salt feeding dragon 3 and then sent to a rotary kiln 5 for pyrolysis reaction; the residence time of the industrial waste salt in the rotary kiln 5 is 2 hours; in other embodiments, the specific residence time of the industrial waste salt may be adjusted according to the content of impurities such as water and organic matters in the industrial waste salt, so as to ensure that the form of the pyrolyzed waste salt meets the feeding requirement of the melting furnace 20; the TOC of the industrial waste salt leaving the rotary kiln 5 is about 300ppm. The feeding amount of the rotary kiln 5 is mainly controlled by the frequency conversion of the raw material salt feeding dragon 3 to realize quantitative conveying, and the amount of the industrial waste salt entering the rotary kiln 5 is controllable, so that the industrial waste salt is uniformly and effectively treated all the time; meanwhile, as the raw material salt feeding dragon 3 is inclined upwards, the rotary kiln 5 can realize material level sealing as long as industrial waste salt is kept in the first storage bin 2 in the system operation process, so that the overall tightness of the rotary kiln 5 is ensured; organic matters in the industrial waste salt are heated and cracked into combustible micromolecular gas and simple substance carbon black in the rotary kiln 5, and the combustible micromolecular gas and the simple substance carbon black are converted into water vapor impurity water in the waste salt to form pyrolysis gas, and the pyrolysis gas is sent into the melting furnace 20 to be combusted so as to fully utilize the organic matters in the pyrolysis gas, thereby reducing the overall energy consumption of a treatment system; the ash hopper 15 facilitates the collection of the fumes adsorbed from the fumes for subsequent treatment.
The burner 201 is a swirl burner, the secondary air nozzles 203 are symmetrically distributed around the axis of the melting furnace 20, and the number of the secondary air nozzles 203 is 4. Industrial waste salt enters the furnace through the cyclone burner, and secondary air blown out by the secondary air nozzles 203 which are tangentially and symmetrically arranged forms tangential motion, and mass transfer effect is fully generated with flue gas in the downward flowing process in the melting furnace 20, so that TOC is deeply removed.
In other embodiments, the number of secondary air nozzles 203 may be 8.
The treatment system further comprises a tail gas treatment module which is connected with the melting furnace 20;
the tail gas treatment module comprises a spray cylinder 24, wherein the spray cylinder 24 is a cylinder, a water curtain is arranged in the spray cylinder 24, a spray head 241 is arranged on the inner surface of the top, and when the spray head 241 works, cooling liquid is sprayed to the inner space and the inner wall of the spray cylinder 24; the bottom of the spray cylinder 24 is provided with a cooling liquid outlet, and the outer wall of the spray cylinder 24 is annularly provided with a water-cooling jacket; the cooling liquid flows in the cooling liquid flow paths DW 1-DW 4, enters the cooling liquid circulation device 26 after leaving the spray cylinder 24 to be supplemented with new cooling liquid, and then flows to the atomized cooling liquid flow path DW5 or the water curtain cooling liquid flow path DW6 again through the cooling liquid circulation pump 27, and also flows to the salt dissolving system flow path 106 partially; the cooling liquid is deionized water. The temperature of the flue gas leaving the melting furnace 20 is 900 ℃, and part of salt steam and salt liquid drops are accompanied, and after entering the tail gas treatment module, the water curtain in the spray drum 24 enables the flue gas to be quickly cooled to 650 ℃; during the cooling process, the salt steam and salt droplets are respectively sublimated and solidified to form salt dust, part of the salt dust is attached to the wall surface of the spray cylinder 24, and the spray head 241 cleans condensed industrial waste salt attached to the inner wall of the spray cylinder 24 by virtue of cooling liquid sprayed out of the inner wall, so that the inside of the spray cylinder 24 is ensured to be unobstructed; the cooling liquid leaves the spray cylinder 24 through a cooling liquid outlet arranged at the bottom of the spray cylinder 24, and can be used for the subsequent treatment of industrial waste salt and used as downstream salt dissolving water; the water-cooled jacket maintains the spray drum 24 housing temperature in equilibrium so that the industrial waste salt is uniformly cooled.
A flue gas outlet is arranged on the spray cylinder 24, and a first flue gas pipeline 251 is arranged between the flue gas outlet and the rotary kiln 5 and is used for sending part of flue gas generated by the melting furnace 20 back to the rotary kiln 5; a salt powder dust remover 25 is arranged between the flue gas outlet and the first flue gas pipeline 251; an air inlet is arranged on the melting furnace 20, and a second flue gas pipeline 252 is arranged between the air inlet and the rotary kiln 5; the heat exchange mode of the rotary kiln 5 is dividing wall type heat exchange; the melting module further comprises a primary fan 17, and the primary fan 17 is connected with the air inlet; a heat exchanger 18 is arranged between the primary air fan 17 and the air inlet, a second flue gas pipeline 252 is connected with the heat exchanger 18, and the flue gas subjected to heat exchange in the rotary kiln 5 is sent into the heat exchanger 18 to perform non-contact heat exchange with air; the flue gas leaving the heat exchanger 18 enters the flue gas tail treatment device 51 and is discharged after being treated. The high-temperature flue gas which enters the spray cylinder 24 for desalting and dedusting and is subjected to preliminary cooling is sent to the rotary kiln 5 for heat exchange, so that the temperature inside the rotary kiln 5 is 450 ℃, at the moment, the specific temperature inside the rotary kiln 5 is determined according to the content of impurities such as water, organic matters and the like in industrial waste salt, so as to ensure that the form of the pyrolyzed waste salt meets the feeding requirement of the melting furnace 20, and the flue gas is cooled to 320 ℃; the high-temperature flue gas is further preheated after flowing out of the rotary kiln 5, and the air sent into the melting furnace by the primary air blower 17, so that the temperature of the primary air is raised to 60 ℃, the water content of the air is reduced, the phenomenon that the industrial waste salt is damped due to the fact that water vapor in the primary air contacts with the pyrolyzed industrial waste salt is prevented from being separated out, meanwhile, the waste heat of the high-temperature flue gas is effectively utilized, and the overall thermal efficiency of the treatment system is improved; meanwhile, the dividing wall type heat exchange isolates the flue gas and the rotary kiln 5, so that the influence on industrial waste salt in the rotary kiln 5 is avoided; residual salt in the flue gas flowing out of the flue gas outlet is adsorbed and collected by the salt powder dust remover 25, so that only the flue gas entering the first flue gas pipeline 251 is enabled to improve the comprehensive yield of the treatment system, and the salt powder dust remover 25 is a cyclone dust remover or a ceramic fiber filter tube dust catcher.
The intermediate treatment module further comprises a cooling device 6, a conveying device 7 and an intermediate storage tank 8 which are sequentially connected along the movement direction of the industrial waste salt, and a discharge hole of the intermediate storage tank 8 is connected with a separation device 9. The industrial waste salt subjected to the pyrolysis primary treatment is sent to a cooling device 6 for cooling, and then sent to an intermediate storage tank 8 by a conveying device 7, and separated into coarse salt and fine salt by a separating device 9 for subsequent collection and treatment, respectively.
The intermediate storage tank 8 comprises a first intermediate storage tank 81 and a second intermediate storage tank 82 which are arranged in parallel, the bottoms of the first intermediate storage tank 81 and the second intermediate storage tank 82 are provided with discharge ports, and the conveying equipment 7 is communicated with the first intermediate storage tank 81 or the second intermediate storage tank 82; the separation device 9 also comprises a second stock bin 12, and the separation device 9 is provided with a coarse salt outlet and a fine salt outlet; the fine salt outlet is sequentially connected with the middle dragon 10, the pyrolytic salt bucket elevator 11 and the second storage bin 12, and the second storage bin 12 is provided with a heating device for enabling the air temperature in the second storage bin 12 to be higher than the ambient temperature; the second bin 12 is connected with the melting furnace 20 through a second bin bottom dragon 13; the crude salt outlet is connected with a crude salt flow path 105, so that crude salt is temporarily stored after leaving the separation device 9, and is sequentially connected with the rotary kiln 5 through a pulverizer and a crude salt pipeline after the quantity meets the requirement, and is sent into the rotary kiln 5 for reprocessing; the outer sides of the cooling device 6, the conveying device 7, the first middle storage tank 81 and the second middle storage tank 82 are respectively provided with a water cooling jacket; the cooling device 6 is a slag dragging machine and also can be a scraper machine; the separating apparatus 9 is a vibratory screening machine. The conveying equipment 7 can adjust the running direction, after one intermediate storage tank is full, the direction can be adjusted, the industrial waste salt after pyrolysis treatment is conveyed to the other intermediate storage tank, and a discharge hole at the bottom of the full intermediate storage tank is opened to realize discharge in the tank; the separation device 9 separates the industrial waste salt after pyrolysis treatment into coarse salt and fine salt, and the coarse salt is crushed and then sent to the rotary kiln 5 again for treatment, so that the quality of the industrial waste salt entering the melting furnace 20 is ensured, and meanwhile, an intermediate treatment module is isolated from the outside, so that the tightness of a treatment system is improved; the heating device is arranged in the second storage bin 12, so that the temperature of the air in the second storage bin 12 is 15 ℃ higher than the ambient temperature, and the relative humidity of the air in the second storage bin 12 is maintained at a lower level, thereby effectively inhibiting the precipitation of water in the air and ensuring the dryness of industrial waste salt in the second storage bin 12; the cooling device 6, the conveying device 7, the first intermediate storage tank 81 and the second intermediate storage tank 82 are provided with water-cooling jackets, so that the industrial waste salt therein is effectively and uniformly cooled.
The melting module further includes a discharge conveyor to which the bottom of the melting furnace 20 is connected via a salt outlet. After being treated in the melting furnace 20, the industrial waste salt enters a discharging and conveying device through a salt outlet, is sent out of the melting furnace 20 and is collected for subsequent processing and utilization.
The discharging and conveying device comprises a condensing device 202 and a discharging and conveying device 22, wherein a scraper 202 is arranged in the condensing device 202 and is used for scraping the solidified products on the inner surface of the condensing device 202 and enabling the solidified products to fall onto the discharging and conveying device 22; the discharging conveying device 22 is connected with a discharging bin 23; the inside of the condensing equipment 202 is provided with a heat conducting OIL cooling structure, the outside of the condensing equipment 202 is provided with a heat conducting OIL cooler 21, and the heat conducting OIL cooler 21 is connected with the heat conducting OIL cooling structure through cooling OIL flow paths OIL 1-OIL 2 to form a heat conducting OIL circulation loop; the condensing equipment 202 is a roller slag cooler. The condensing equipment 202 radiates heat through the circulation of the heat conduction oil, and the running temperature of the condensing equipment 202 is maintained to be 350 ℃, so that the industrial waste salt falling into the condensing equipment 202 is effectively and uniformly cooled, and after the industrial waste salt is solidified, the industrial waste salt is scraped down onto the discharging and conveying equipment 22 to be conveyed and collected, and is conveyed to the discharging bin 23 for temporary storage.
The embodiment also provides a treatment process of industrial waste salt, wherein the treatment process uses the treatment system, and the treatment process comprises the following steps:
the industrial waste salt enters a pyrolysis module, is sent into a rotary kiln 5 for pyrolysis and is divided into pyrolysis gas and primary products, the primary products enter an intermediate treatment module, the temperature in the rotary kiln 5 is kept at 450 ℃, the pressure in the rotary kiln 5 is 0.5kPa, and the residence time of the industrial waste salt in the rotary kiln 5 is 2 hours;
the primary product enters a separation device 9 and is separated into coarse salt and fine salt, the coarse salt returns to the rotary kiln 5 to be reprocessed, the fine salt enters a melting furnace 20, the temperature in the melting furnace 20 is kept at 950 ℃, the pressure in the melting furnace 20 is-1 kPa, and the residence time of the industrial waste salt in the melting furnace 20 is 0.75min; the particle size of the crude salt is larger than 0.3mm;
fine salt enters the melting furnace 20 from the upper part, and is combusted and melted by the burner 201 and the secondary air nozzle 203 to generate flue gas and solid products. The industrial waste salt is sequentially subjected to the procedures of pyrolysis, separation and melting, and the TOC of the final product is reduced to below 5ppm by the industrial waste salt treatment system, so that the product quality is greatly improved, and the subsequent utilization and treatment are facilitated.
Establishing an industrial waste salt disposal center applying the industrial waste salt treatment system, wherein the main component of the industrial waste salt is sodium chloride, and the TOC content of the industrial waste salt is 3500ppm; the planned annual treatment capacity is 6 ten thousand tons/year, the annual production time is 7200 hours, the single production line treatment capacity is 15000 tons/year, 5 production lines (1 for 4) applying the industrial waste salt treatment system of the invention are designed, the diameter of a first bin is 3.2m, the diameter of a kiln body of a rotary kiln 5 is about 1.7m, the length of the kiln body is 17m, the diameter of a melting furnace 20 is about 5.4m, the height of the melting furnace is about 20m, the size of a salt dust remover 25 is 6.2m by 16m, the single line occupies about 20m by 28m, the installed capacity of electric equipment of the single line is about 220kW, and the natural gas consumption is about 230Nm 3 And/h. The TOC of the waste salt after disposal was about 2.7ppm.
In the industrial waste salt treatment system of the present invention, solids flow through the solid flow paths S1 to S7, and gases flow through the gas flow paths G1 to G12; the cooling water flows through the cooling water supply 101 and the cooling water return 102, the air flows through the air flow path 103, and the nitrogen flows through the nitrogen flow path 104.
In order to achieve the technical effects of the industrial waste salt treatment system, corresponding auxiliary matching equipment is also arranged in the system, wherein the auxiliary matching equipment comprises a storage site and a crushing equipment of incoming industrial waste salt, the system is matched with auxiliary public works such as fresh water, deionized water, nitrogen, compressed air and the like, and the transportation and storage sites of product salt are auxiliary equipment for achieving the technical effects of the industrial waste salt treatment system, but the integrity of the industrial waste salt treatment system is not affected by the auxiliary equipment, so the detailed description is omitted in the embodiment.
Example two
The industrial waste salt treatment system applied in this embodiment is the same as that in the first embodiment, except that: the melting furnace 20 was maintained at an operating temperature of 1000 c and the residence time of the industrial waste salt in the melting furnace 20 was 1.2min, with the TOC of the waste salt after disposal being about 1.8ppm.
Example III
The industrial waste salt treatment system applied in this embodiment is the same as that in the first embodiment, except that: an industrial waste salt disposal center using the industrial waste salt disposal system of the invention is established, the main components of the industrial waste salt are sodium chloride and sodium sulfate, the TOC content of the industrial waste salt is 3000ppm, the planned annual throughput is 3 ten thousand tons/year, the annual production time is 7200 hours, the single production line throughput is 10000 tons/year, 4 production lines (3 for 1) using the industrial waste salt disposal system of the invention are designed, the diameter of a first bin is 2.6m, the diameter of a kiln body of a rotary kiln 5 is about 1.5m, the length is 15m, the diameter of a melting furnace 20 is about 4.32m, the height is about 17m, the size of a salt dust remover 25 is 5m x 14m, the installed capacity of electric equipment of a single line is about 185kW, and the natural gas consumption is about 198Nm 3 And/h. The TOC of the waste salt after disposal was about 3.4ppm.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the invention, but such changes and modifications fall within the scope of the invention.
Claims (10)
1. A treatment system for industrial waste salt, which is characterized by comprising a pyrolysis module, an intermediate treatment module and a melting module;
the pyrolysis module comprises a rotary kiln and is used for pyrolyzing the industrial waste salt into a primary product and pyrolysis gas;
the intermediate treatment module comprises a separation device which is connected with the rotary kiln and is used for separating the preliminary product into coarse salt and fine salt and sending the coarse salt back into the rotary kiln after being crushed;
the melting module comprises a melting furnace, and the separation device is connected with the melting furnace and is used for conveying the fine salt into the melting furnace;
the utility model discloses a smelting furnace, including the melting furnace, be equipped with combustor, a plurality of overgrate air nozzle and salt outlet in the melting furnace, the combustor is established the top of melting furnace, the overgrate air nozzle is established on the middle section oven of melting furnace to be tangential setting along the oven, be used for making flue gas in the melting furnace is followed the axial of melting furnace is around the tangential motion of the oven of melting furnace, the salt outlet sets up the bottom of melting furnace.
2. The treatment system of claim 1, wherein the pyrolysis module further comprises a first bin and a feeding device connected in sequence along the movement direction of the industrial waste salt, the feeding device is connected with the rotary kiln, and the feeding device is controlled in a variable frequency manner and is used for controlling the feeding amount of the rotary kiln; and a pyrolysis gas pipeline is arranged between the rotary kiln and the melting furnace and used for delivering pyrolysis gas in the rotary kiln to the melting furnace for combustion.
3. The processing system of claim 1, wherein the burner is a swirl burner, the overgrate air nozzles are symmetrically distributed about the axis of the melting furnace, and the number of overgrate air nozzles is 4 or 8.
4. The treatment system of claim 1, further comprising an exhaust treatment module coupled to the melting furnace; the tail gas treatment module comprises a spray cylinder, the spray cylinder is a cylinder, a spray head is arranged on the inner surface of the top of the spray cylinder, and when the spray head works, cooling liquid is sprayed to the inner space and the inner wall of the spray cylinder; the bottom of the spray cylinder is provided with a cooling liquid outlet, and the outer wall of the spray cylinder is annularly provided with a water-cooling jacket.
5. The processing system of claim 4, wherein a flue gas outlet is provided on the spray drum, and a first flue gas pipeline is provided between the flue gas outlet and the rotary kiln for returning part of flue gas generated by the melting furnace to the rotary kiln; a salt powder dust remover is arranged between the flue gas outlet and the first flue gas pipeline; an air inlet is formed in the melting furnace, and a second flue gas pipeline is arranged between the air inlet and the rotary kiln; the heat exchange mode of the rotary kiln is dividing wall type heat exchange;
the melting module further comprises a primary fan, and the primary fan is connected with the air inlet; and a heat exchanger is arranged between the primary fan and the air inlet, the second flue gas pipeline is connected with the heat exchanger, and the flue gas subjected to heat exchange in the rotary kiln is sent into the heat exchanger to perform non-contact heat exchange with air.
6. The treatment system of claim 1, wherein the intermediate treatment module further comprises a cooling device, a conveying device and an intermediate storage tank connected in sequence along the movement direction of the industrial waste salt, and wherein a discharge port of the intermediate storage tank is connected to the separation device.
7. The treatment system of claim 6, wherein the intermediate storage tank comprises a first intermediate storage tank and a second intermediate storage tank which are arranged in parallel, wherein a discharge port is arranged at the bottoms of the first intermediate storage tank and the second intermediate storage tank, and the conveying equipment is communicated with the first intermediate storage tank or the second intermediate storage tank;
the separation device also comprises a second bin, and is provided with a coarse salt outlet and a fine salt outlet; the fine salt outlet is sequentially connected with the second bin and the melting furnace; the second storage bin is provided with a heating device, and the heating device is used for enabling the temperature of air in the second storage bin to be higher than the ambient temperature; the crude salt outlet is connected with the rotary kiln through a pulverizer and a crude salt pipeline in sequence and is used for pulverizing crude salt separated by the separation device and then sending the pulverized crude salt into the rotary kiln for reprocessing; the outside of cooling equipment, conveying equipment, first intermediate storage tank and second intermediate storage tank all is equipped with the water-cooling jacket.
8. The processing system of claim 1, wherein the melting module further comprises an outfeed conveyor, the bottom of the melting furnace being connected to the outfeed conveyor by the salt outlet.
9. The treatment system of claim 8, wherein the outfeed conveyor means comprises a condensing apparatus and an outfeed conveyor apparatus, the condensing apparatus having a scraper disposed therein for scraping off and depositing onto the outfeed conveyor apparatus a product solidified on an inner surface of the condensing apparatus; the inside of condensation equipment is equipped with conduction oil cooling structure, the outside of condensation equipment is equipped with conduction oil cooler, conduction oil cooler with conduction oil cooling structure forms conduction oil circulation loop.
10. A process for the treatment of industrial waste salts, characterized in that it uses a treatment system according to any one of claims 1-9, comprising the steps of:
the TOC of the industrial waste salt entering the treatment system is 200 ppm-20000 ppm, the industrial waste salt enters the pyrolysis module, the pyrolysis module is fed into the rotary kiln for pyrolysis and then is divided into pyrolysis gas and preliminary products, the preliminary products enter the intermediate treatment module, the temperature in the rotary kiln is kept at 350-550 ℃, the pressure in the rotary kiln is 0-2 kPa, and the residence time of the industrial waste salt in the rotary kiln is 0.5-3 h;
the primary product enters the separation device and is separated into coarse salt and fine salt, the coarse salt returns to the rotary kiln for reprocessing, the fine salt enters the melting furnace, the temperature in the melting furnace is kept between 850 and 1200 ℃, the pressure in the melting furnace is between-5 and 3kPa, and the residence time of the industrial waste salt in the melting furnace is between 0.5 and 3 minutes; the particle size of the crude salt is larger than 0.3mm;
fine salt enters the melting furnace from the upper part and is combusted and melted through the burner and the secondary air nozzle to generate smoke and solid products; the TOC of the solid product is preferably less than 5ppm; more preferably, the operating temperature of the melting furnace is kept higher than 950 ℃, the residence time of the industrial waste salt in the melting furnace is less than 1.5min, the pressure in the melting furnace is-1 to 1kPa, and the TOC of solid products is less than 2ppm.
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