CN112113223B - Method for cooperatively disposing industrial dangerous waste by utilizing steel mill kiln - Google Patents
Method for cooperatively disposing industrial dangerous waste by utilizing steel mill kiln Download PDFInfo
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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
- F23G5/033—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment comminuting or crushing
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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
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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
- F23G5/0276—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment pyrolising or gasifying stage using direct heating
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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
- F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
- F23G5/12—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating using gaseous or liquid fuel
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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
- F23G5/46—Recuperation of heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B19/00—Combinations of furnaces of kinds not covered by a single preceding main group
- F27B19/04—Combinations of furnaces of kinds not covered by a single preceding main group arranged for associated working
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- 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
- F23G2201/304—Burning pyrosolids
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2204/00—Supplementary heating arrangements
- F23G2204/10—Supplementary heating arrangements using auxiliary fuel
- F23G2204/103—Supplementary heating arrangements using auxiliary fuel gaseous or liquid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2206/00—Waste heat recuperation
- F23G2206/10—Waste heat recuperation reintroducing the heat in the same process, e.g. for predrying
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- General Engineering & Computer Science (AREA)
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to the field of recycling treatment of industrial hazardous wastes, in particular to a method for cooperatively treating industrial hazardous wastes by utilizing a steel mill kiln, which is used for detecting and classifying the collected industrial hazardous wastes, crushing the industrial hazardous wastes in a crusher according to batches, and separating iron materials in the industrial hazardous wastes by a magnetic separator; carrying out primary homogenization and compatibility on the industrial hazardous waste subjected to magnetic separation and iron removal to obtain waste to be fed; feeding waste to be fed into a pyrolysis gasifier; collecting pyrolysis gas as fuel, introducing the fuel into a hot blast furnace of a blast furnace for burning, sampling and analyzing mineral phases and harmful element contents in pyrolysis slag, carrying out secondary homogenization compatibility on the pyrolysis slag and steelmaking sintering raw materials according to the limiting requirement of a steelmaking process on element components, then mixing and sintering, and putting the sintering ore into the blast furnace for high-temperature melting treatment. The invention has the technical effects of fully recycling heat energy and resources, low running cost and small influence on the original production process equipment of the steel mill.
Description
Technical Field
The invention relates to the field of recycling treatment of industrial hazardous wastes, in particular to a method for cooperatively treating industrial hazardous wastes by utilizing a steel mill kiln.
Background
In 2018, the national industrial hazardous waste is produced in an amount of about 4643.0 ten thousand tons. The incineration method is a main means for reducing the amount of industrial hazardous waste, and can oxidize and decompose the combustible industrial hazardous waste by high-temperature incineration to remove toxicity. The prior incineration method mainly adopts a rotary kiln and secondary combustion chamber technology, and the technology needs to be matched with a complex tail gas treatment system so as to ensure the burnout of solid waste and the standard discharge of gas. In addition, the investment and the operation cost of the industrial hazardous waste incineration facility are high, and about 30-40 tons of incineration residues and fly ash are needed to be further treated for each 100 tons of solid waste, so that the treatment of the incineration method is high in charge.
Chinese patent application (publication No. CN 110734209A) discloses an operation method of an integrated device for cooperatively treating industrial solid waste and sludge in a rotary kiln. The integrated device of the sludge spray drying (direct drying) +disc drying (indirect drying), the rotary kiln and the industrial leftover material (solid waste) collaborative incineration and the flue gas purification system is adopted, and the integrated device integrates sludge drying, industrial leftover material (solid waste) collaborative incineration and flue gas purification. The waste is reused, and the environmental pollution is reduced. The patent can treat industrial solid waste naturally, but requires additional equipment, increases the cost investment of the equipment, and meanwhile, the beneficial metals in the solid waste cannot be utilized.
China is the first large world steel yield, and the annual steel yield is about half of the world. The main production equipment of the steel mill comprises a sintering machine, a coke machine, a rotary kiln, a blast furnace, a converter, an electric furnace, a refining furnace and the like, and industrial dangerous wastes can be treated cooperatively by utilizing the high temperature and oxidation-reduction characteristics of the production equipment, so that combustible substances in the industrial dangerous wastes can be thoroughly incinerated, toxic substances such as heavy metals can be reduced and detoxified, or molten glass can be converted into slag, and the recycling can be realized. There are reports of co-treatment technologies such as blast furnace side-blown feed technology, coke machine confocal technology and sintering machine chromium slag treatment technology. However, the technology has higher material selectivity on industrial dangerous wastes, single treatment type and limited application range. The sources of industrial hazardous wastes are wide, the types are wide, the components are complex, the mixing of the industrial hazardous wastes into the materials is not considered in the design of the original equipment of the steel mill, and the direct feeding can possibly cause damage such as corrosion to the original equipment of the steel mill.
Disclosure of Invention
Aiming at the defects of the prior art, the invention combines the solid waste pyrolysis treatment technology with the steel mill production technology, the solid waste is subjected to preliminary pyrolysis treatment, the generated pyrolysis gas can be used as the fuel for iron making, and the solid slag generated by pyrolysis can replace part of raw materials for blast furnace iron making, so that the invention aims to provide the method for cooperatively disposing industrial dangerous waste by utilizing the steel mill kiln, which has wide application range, fully recycles heat energy and resources, has low operation cost and small influence on the original production technology equipment of the steel mill.
For the purpose of the invention, the following technical scheme is adopted for implementation:
a method for co-disposal of industrial hazardous waste using a steel mill kiln, the method comprising the steps of:
1) Detecting the collected industrial hazardous waste, and classifying and storing according to the heat value, harmful substances and hazardous characteristics, wherein the industrial hazardous waste comprises organic hazardous waste, metal waste and other inorganic hazardous waste except metal generated by industrial enterprises;
2) Respectively putting industrial dangerous wastes into a crusher for crushing according to batches, and separating iron materials in the industrial dangerous wastes by a magnetic separator;
3) The industrial dangerous waste subjected to magnetic separation and iron removal enters different pits according to the heat value, the water content and the element content;
4) Feeding industrial dangerous wastes from all the pits into a feeding pool, uniformly mixing, and carrying out primary homogenization compatibility to obtain waste to be fed with a heat value of more than 3000 kilocalories, a water content of less than 50% and moderate content of harmful elements;
5) The waste to be fed in the feeding pool is added into a pyrolysis gasification furnace, a proper amount of oxygen is blown in, the anoxic atmosphere in the furnace is maintained, and the temperature of the pyrolysis furnace is controlled within the range of 300 ℃ to 1000 ℃;
6) Collecting pyrolysis gas as fuel, introducing the fuel into a hot blast furnace of a blast furnace for burning, thoroughly decomposing organic matters, and discharging generated hot air into the blast furnace from the bottom together with the blast furnace gas;
7) And (3) sampling and analyzing the mineral phase and the content of harmful elements in the pyrolysis slag, carrying out secondary homogenization compatibility on the pyrolysis slag and the steelmaking sintering raw materials according to the requirement of a steelmaking process on element components, controlling the alkalinity of the sintering ore to be 1.8-2.0 according to the addition proportion of the pyrolysis slag of 0.5 wt% -8 wt%, mixing and sintering, and putting the sintering ore into a blast furnace for high-temperature melting treatment.
Preferably, the industrial hazardous waste comprises organic hazardous waste generated by chemical industry, medicine, petrifaction, paint and environmental protection enterprises, and inorganic hazardous waste such as electroplating sludge, metallurgy, chromium slag and the like.
Preferably, the iron separated by the magnetic separation in the step 2) is collected and is pressed and packed to prepare raw materials meeting the requirement of feeding specifications, and the raw materials are put into a converter or an electric furnace for smelting to replace part of iron ore and scrap iron raw materials.
Preferably, step 5) uses part of the gas produced by the steelworks such as blast furnace gas, coke oven gas, etc. as a heat source for starting the heating and as a supplemental heat source for the treatment of low heating value waste.
Preferably, the substances after the high-temperature melting in the step 7) enter high-temperature pyrolysis slag and enter a sintering machine as return ores, or are comprehensively utilized as raw materials in building material industries such as cement, aggregate, ballast, highway subgrade and the like.
The invention further provides a system for cooperatively disposing industrial hazardous waste by utilizing the furnace and the kiln of the steel mill, which comprises a crusher, magnetic separation treatment equipment, homogenization compatibility equipment, a pyrolysis gasifier, a hot blast stove, a sintering machine and a blast furnace; respectively throwing the collected and classified industrial dangerous wastes into a crusher for crushing, wherein a discharge hole of the crusher is connected with magnetic separation treatment equipment through a pipeline, the magnetic separation treatment equipment is connected with a pit, the pit is connected with a feeding pool through a grab bucket for grabbing the wastes, and homogenization compatibility equipment is arranged in the feeding pool; carrying out magnetic separation treatment on crushed wastes in magnetic separation treatment equipment, enabling the industrial hazardous wastes subjected to iron removal to enter different pits according to heat value, water content and element content, grabbing the industrial hazardous wastes from each pit to a feeding pool by using a grab bucket, and carrying out primary homogenization compatibility on the industrial hazardous wastes through homogenization compatibility equipment according to the heat value, the water content and the element content; the homogenization and compatibility equipment is connected with the pyrolysis gasifier through a pipeline and a pump, industrial dangerous wastes after homogenization and compatibility are put into the pyrolysis gasifier through a grab bucket or a solid pump for pretreatment, the upper part of the pyrolysis gasifier is connected with the hot blast stove through an air pipe, the lower part of the pyrolysis gasifier is connected with the sintering machine through a pipeline, and the sintering machine is connected with the blast furnace through a pipeline; pyrolysis gas generated by pyrolysis of solid waste gas is used as fuel to be conveyed into a hot blast furnace of a blast furnace for burning, and generated hot air enters the blast furnace from the bottom and is discharged together with the blast furnace gas; and (3) putting the pyrolysis slag obtained after pyrolysis of the solid waste gas into a sintering machine, mixing the pyrolysis slag with raw materials in the sintering machine, sintering the raw materials and the pyrolysis slag into blocks, and then putting the blocks into a blast furnace for high-temperature melting treatment.
Preferably, the industrial hazardous waste comprises organic hazardous waste generated by industrial enterprises and inorganic hazardous waste such as electroplating sludge, metallurgy, chromium slag and the like.
Preferably, more than five pits are provided for temporarily storing high-calorific-value high-harmful substances, high-calorific-value low-harmful substances, low-calorific-value high-harmful substances, low-calorific-value low-harmful substances and medium-calorific-value harmful substances, respectively.
Preferably, the magnetic separation treatment equipment is connected with the converter through a pipeline, and iron materials separated after passing through the magnetic separation treatment equipment are collected, pressed and packed and enter the converter for smelting.
Preferably, oxygen is introduced into the pyrolysis gasification furnace, so that the anoxic environment is maintained in the pyrolysis gasification furnace.
In summary, the beneficial effects of the invention are as follows:
1. the industrial hazardous waste is subjected to crushing, magnetic separation, pyrolysis and twice homogenization compatibility pretreatment processes, so that the components and properties of the industrial hazardous waste to be treated are stable, the method can adapt to different characteristics of various industrial hazardous wastes, and the influence of harmful elements in the industrial hazardous waste on molten iron is effectively controlled.
2. After pyrolysis pretreatment of industrial dangerous waste, harmful substances are primarily degraded, organic matters and water are removed, and pyrolysis slag mainly comprises inorganic mineral components including CaO, mgO, siO 2 And metal elements such as Fe, cr, ni, co, etc., the properties of the pyrolysis slag are stable, and the dangerous properties are obviously reduced. At the moment, the steel mill production equipment is cooperatively treated, so that the influence on the original production system can be obviously reduced.
3. The gas generated by pyrolysis is subjected to high-temperature secondary treatment in a hot blast stove and blast furnace equipment, and the temperature is up to 2000 ℃, so that organic matters are thoroughly decomposed, the generation of dioxin is avoided, and meanwhile, the heat energy in industrial dangerous waste is recovered.
4. The self part of blast furnace gas or converter gas of a steel mill is used as a heating starting heat source for pyrolysis of industrial dangerous wastes and a supplementary heat source for treatment of low-heat-value wastes, no external energy source is needed, and heat energy in the steelmaking process is fully utilized.
5. The Ca and Mg mineral components in the industrial dangerous waste can reduce the melting temperature and promote the slag formation of the blast furnace. The proper Si content can ensure the drum strength of the sinter. Part of Fe, cr, ni, co metal is reduced into molten iron, so that resource recycling is realized.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Fig. 2 is a flow chart of the system of the present invention.
Detailed Description
The industrial hazardous waste in the invention comprises organic hazardous waste generated by chemical industry, medicine, petrifaction, paint and environmental protection enterprises, and inorganic hazardous waste such as electroplating sludge, metallurgy, chromium slag and the like.
As shown in fig. 1, a method for co-disposing industrial hazardous waste by using a steel mill kiln, the method comprising the steps of:
1) Detecting the collected industrial hazardous waste, and storing the industrial hazardous waste in a classified manner according to the heat value, the hazardous substances and the hazardous characteristics;
2) Respectively crushing industrial hazardous wastes such as chromium-containing sludge, paint slag, tar slag and the like in a crusher according to batches, separating iron materials in the industrial hazardous wastes by a magnetic separator, collecting iron separated by magnetic separation, briquetting and packaging to prepare raw materials meeting the requirement of feeding specifications, and smelting the raw materials in a converter or an electric furnace to replace part of iron ores and scrap iron raw materials;
3) The industrial dangerous waste subjected to magnetic separation and iron removal enters different pits according to the heat value, the water content and the element content;
4) The industrial dangerous wastes in all the pits are sent into a feeding pool, uniformly mixed and subjected to primary homogenization compatibility to obtain waste to be fed, which has a heat value of about 3500 kilocalories, a water content of 45% and a moderate content of harmful elements (without affecting the quality of molten steel);
5) The waste to be fed in the feeding pool is added into a pyrolysis gasification furnace, gas generated by a part of steel plants such as blast furnace gas, coke oven gas and the like is used as a heating starting heat source and a supplementary heat source when low-heat value waste is treated, a proper amount of oxygen is blown in, the anoxic atmosphere in the furnace is maintained, and the temperature of the pyrolysis furnace is controlled within the range of 800 ℃;
6) Collecting pyrolysis gas as fuel, introducing the fuel into a hot blast furnace of a blast furnace for burning, thoroughly decomposing organic matters, and discharging generated hot air into the blast furnace from the bottom together with the blast furnace gas;
7) The pyrolysate is sampled and analyzed to obtain mineral phases and harmful element contents, and the pyrolysate is subjected to secondary homogenization and compatibility with sintering raw materials such as iron ore powder, coke powder, limestone powder and the like according to the limiting requirement of a steelmaking process, wherein the pyrolysate accounts for 3.5 wt%, the iron ore powder is 61 wt%, the coke powder is 4% by weight, the return ores are 17 wt% and the limestone powder is 14.5 wt%. And (3) sintering the pyrolysis slag and other raw materials together, controlling the alkalinity of the sintered ore to be 1.8-2.0, and feeding the sintered ore into a blast furnace from the upper part through a feeding system for iron making. Controlling the alkalinity of the sinter to be 1.8-2.0, then mixing and sintering, and putting the sinter into a blast furnace for high-temperature melting treatment; the high-temperature melted substances enter high-temperature pyrolysis slag and enter a sintering machine as return ores, or are comprehensively utilized as raw materials in building material industries such as cement, aggregate, ballast, highway subgrade and the like.
As shown in fig. 2, a system for cooperatively disposing industrial hazardous waste by using a steel mill kiln comprises a crusher 1, a magnetic separation treatment device 2, a homogenization compatibility device 3, a pyrolysis gasification furnace 4, a hot blast stove 5, a sintering machine 6 and a blast furnace 7; respectively throwing the collected and classified industrial dangerous wastes into a crusher 1 for crushing, wherein a discharge hole of the crusher 1 is connected with a magnetic separation treatment device 2 through a pipeline, the magnetic separation treatment device 2 is connected with a pit, the pit is connected with a feeding pool through a grab bucket for grabbing the wastes, and a homogenization compatibility device 3 is arranged in the feeding pool; the crushed waste is subjected to magnetic separation treatment in a magnetic separation treatment device 2, the industrial hazardous waste after iron removal enters different pits according to heat value, water content and element content, more than five pits are arranged, and the pits are respectively temporarily used for temporarily storing high-heat-value high-harmful substances, high-heat-value low-harmful substances, low-heat-value high-harmful substances, low-heat-value low-harmful substances and harmful substances in medium heat value. Grabbing industrial dangerous wastes from each pit to a feeding pool by using a grab bucket, and carrying out primary homogenization and compatibility on the industrial dangerous wastes according to the heat value, the water content and the element content by using a homogenization and compatibility device 3; the homogenization and compatibility equipment 3 is connected with the pyrolysis gasifier 4 through a pipeline and a pump, and industrial dangerous wastes after homogenization and compatibility are put into the pyrolysis gasifier 4 for pretreatment through a grab bucket or a solid pump, and oxygen is introduced into the pyrolysis gasifier 4, so that the anoxic environment is kept in the pyrolysis gasifier 4. The upper part of the pyrolysis gasification furnace 4 is connected with a hot blast furnace 5 through an air pipe, the lower part of the pyrolysis gasification furnace 4 is connected with a sintering machine 6 through a pipeline, and the sintering machine 6 is connected with a blast furnace 7 through a pipeline; pyrolysis gas generated by pyrolysis of solid waste gas is used as fuel to be conveyed into a hot blast furnace 5 of a blast furnace 7 for incineration, and generated hot air enters the blast furnace from the bottom and is discharged together with the blast furnace gas; the pyrolysis slag obtained by pyrolysis of the solid waste gas is put into a sintering machine 6, the pyrolysis slag is mixed with raw materials in the sintering machine 6, and the raw materials and the pyrolysis slag are sintered into blocks and then put into a blast furnace 7 for high-temperature melting treatment.
The invention has the following advantages:
1. the industrial hazardous waste is subjected to crushing, magnetic separation, pyrolysis and twice homogenization compatibility pretreatment processes, so that the components and properties of the industrial hazardous waste to be treated are stable, the method can adapt to different characteristics of various industrial hazardous wastes, and the influence of harmful elements in the industrial hazardous waste on molten iron is effectively controlled.
2. After pyrolysis pretreatment is carried out on industrial dangerous wastes, harmful substances are primarily degraded, organic matters and water are removed, the properties of pyrolysis residues are stable, dangerous properties are obviously reduced, and the industrial dangerous wastes enter steel mill production equipment to be cooperatively treated at the moment, so that the influence on an original production system can be obviously reduced.
3. The gas generated by pyrolysis is subjected to high-temperature secondary treatment in a hot blast stove and blast furnace equipment, and the temperature is up to 2000 ℃, so that organic matters are thoroughly decomposed, the generation of dioxin is avoided, and meanwhile, the heat energy in industrial dangerous waste is recovered.
4. The self part of blast furnace gas or converter gas of a steel mill is used as a heating starting heat source for pyrolysis of industrial dangerous wastes and a supplementary heat source for treatment of low-heat-value wastes, no external energy source is needed, and heat energy in the steelmaking process is fully utilized.
5. The metal resources Fe, cr, ni, co and the like in the industrial hazardous waste are reduced into molten iron in a blast furnace, so that the recycling of valuable resources is realized.
Claims (6)
1. A method for cooperatively disposing industrial hazardous waste by utilizing a steel mill furnace, wherein the industrial hazardous waste comprises organic hazardous waste generated by chemical industry, medicine, petrifaction, paint and environmental protection enterprises and inorganic hazardous waste comprising electroplating sludge, metallurgy and chromium slag; the method is characterized in that a system adopted by the method comprises a crusher (1), magnetic separation treatment equipment (2), homogenization compatibility equipment (3), a pyrolysis gasification furnace (4), a hot blast stove (5), a sintering machine (6) and a blast furnace (7); connecting a discharge hole of the crusher (1) with magnetic separation treatment equipment (2) through a pipeline, connecting the magnetic separation treatment equipment (2) with a pit, and setting more than five pits to temporarily store high-heat-value high-harmful substances, high-heat-value low-harmful substances, low-heat-value low-harmful substances and medium-heat-value harmful substances respectively; the material pit is connected with a feeding pool through a grab bucket for grabbing waste, and a homogenizing and matching device (3) is arranged in the feeding pool; the homogenization and compatibility equipment (3) is connected with the pyrolysis gasification furnace (4) through a pipeline and a pump, the upper part of the pyrolysis gasification furnace (4) is connected with the hot blast furnace (5) through an air pipe, the lower part of the pyrolysis gasification furnace (4) is connected with the sintering machine (6) through a pipeline, and the sintering machine (6) is connected with the blast furnace (7) through a pipeline;
the method comprises the following steps:
1) Detecting the collected industrial hazardous waste, and classifying and storing according to the heat value, harmful substances and hazardous characteristics, wherein the industrial hazardous waste comprises organic hazardous waste, metal waste and other inorganic hazardous waste except metal generated by industrial enterprises;
2) Respectively putting industrial dangerous wastes into a crusher for crushing according to batches, and separating iron materials in the industrial dangerous wastes through magnetic separation treatment equipment (2);
3) The industrial dangerous waste subjected to magnetic separation and iron removal enters different pits according to the heat value, the water content and the element content;
4) Grabbing industrial dangerous wastes from all the pits by using a grab bucket to a feeding pool, and carrying out primary homogenization and compatibility on the industrial dangerous wastes through a homogenization and compatibility device (3) according to the heat value, the water content and the element content to obtain waste to be fed, wherein the heat value is more than 3000 kilocalories, the water content is less than 50%, and the harmful element content is moderate;
5) The industrial hazardous waste after homogenization and compatibility is put into a pyrolysis gasification furnace (4) for pretreatment through a grab bucket or a solid pump, a proper amount of oxygen is blown in, the anoxic atmosphere in the furnace is maintained, and the temperature of the pyrolysis furnace is controlled within the range of 800 ℃ to 1000 ℃;
6) The pyrolysis gas generated by pyrolysis of the solid waste is used as fuel to be conveyed into a hot blast furnace (5) of a blast furnace (7) for incineration, and the generated hot air enters the blast furnace from the bottom and is discharged together with the blast furnace gas;
7) The pyrolysis slag is sampled and analyzed to obtain mineral phases and harmful element contents, and according to the requirement of steelmaking technology on element component limitation, the pyrolysis slag component mainly comprises inorganic mineral components including CaO, mgO, siO 2 And a metal element Fe, cr, ni, co; carrying out secondary homogenization compatibility on pyrolysis slag and sintering raw materials comprising iron ore powder, coke powder and limestone powder, wherein the pyrolysis slag accounts for 3.5 wt%, the iron ore powder accounts for 61 wt%, the coke powder accounts for 4% by weight, the return ores accounts for 17 wt%, the limestone powder accounts for 14.5 wt%, the alkalinity of the sintering ores is controlled to be 1.8-2.0, then mixing and sintering are carried out, and the sintering ores are put into a blast furnace for high-temperature melting treatment; and the substances after high-temperature melting enter high-temperature pyrolysis slag to be used as return ores.
2. The method according to claim 1, wherein the iron separated by the magnetic separation in the step 2) is collected and packed by a briquetting machine to prepare a raw material meeting the requirement of feeding specification, and the raw material is put into a converter or an electric furnace for smelting to replace part of iron ore and scrap iron raw materials.
3. The method of claim 1, wherein step 5) utilizes a portion of the blast furnace gas or coke oven gas as a supplemental heat source in initiating the heating up of the heat source and in treating the low heating value waste.
4. The method according to claim 1, wherein the high-temperature melted material in step 7) is used as a raw material for the construction industry such as cement, aggregate, ballast, highway subgrade, etc.
5. The method according to claim 1, wherein the magnetic separation treatment equipment (2) is connected with the converter through a pipeline, and the iron materials separated after passing through the magnetic separation treatment equipment (2) are collected and then packed by a briquetting and enter the converter for smelting.
6. The method according to claim 1, wherein oxygen is introduced into the pyrolysis gasifier (4) to maintain an anoxic environment within the pyrolysis gasifier (4).
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| CN108277029A (en) * | 2018-01-11 | 2018-07-13 | 武汉科技大学 | A kind of agglomeration for iron mine Combustion Properties of Municipal Solid Waste charcoal and its preparation and application process |
| CN109253453B (en) * | 2018-09-28 | 2019-11-12 | 新中天环保股份有限公司 | A kind of pre-treatment medicine compatibility method of hazardous waste |
| CN111121057B (en) * | 2019-12-31 | 2021-12-03 | 黄骅新智环保技术有限公司 | Incineration mode based on kiln head temperature of rotary kiln |
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