CN111270077B

CN111270077B - System and method for disposing dust collection ash of steel plant by using chain plate type high-temperature reduction furnace

Info

Publication number: CN111270077B
Application number: CN202010134322.0A
Authority: CN
Inventors: 肖喜才
Original assignee: Changsha Zhongsi Environmental Protection Technology Co ltd
Current assignee: Changsha Zhongsi Environmental Protection Technology Co ltd
Priority date: 2020-03-02
Filing date: 2020-03-02
Publication date: 2023-05-19
Anticipated expiration: 2040-03-02
Also published as: CN111270077A

Abstract

The invention discloses a dust collection ash system and a dust collection ash method for a chain plate type high-temperature reduction furnace to treat dust collection ash in a steel plant, wherein the dust collection ash system comprises a washing dechlorination system, a balling and granulating system, a volatile zinc extraction system and a flue gas treatment system; the evaporation zinc extraction system comprises a chain plate type high-temperature reduction furnace, an oxidation chamber, a salt water evaporation and flue gas sedimentation machine, a high-temperature electrostatic dust collector and a solid warehouse which are sequentially connected, wherein the Gao Wenjing electric dust collector is connected with the chain plate type high-temperature reduction furnace through an exhaust fan, the chain plate type high-temperature reduction furnace comprises a furnace body and a cavity formed by wrapping the furnace body, and the cavity is composed of an evaporation preheating part, a high-temperature reduction part and a cooling part. The chain plate type high-temperature reduction furnace is used as main cremation and refining equipment, and the equipment has simple and unique structure, convenient operation and low manufacturing cost.

Description

System and method for disposing dust collection ash of steel plant by using chain plate type high-temperature reduction furnace

Technical Field

The invention belongs to the technical field of comprehensive utilization of metallurgical industry solid wastes, and particularly relates to a dust collection ash disposal system and method for a steel plant by a chain plate type high-temperature reduction furnace.

Background

The dust collection ash of the steel plant comprises blast furnace ash produced by long-flow enterprises, converter ash and electric furnace ash produced by short-flow enterprises, the waste yield is about 3% -5% of the steel yield, the electric furnace steel yield in 2017 China can reach 1.4 hundred million tons, and 280 ten thousand tons of electric furnace dust is produced. The content of the dust-collecting gray iron is usually over 35-55 percent, and if the dust-collecting gray iron is directly returned to a blast furnace for use, zinc circulation and enrichment can be generated in the blast furnace, so that the production of the blast furnace is endangered; the zinc content in the dust collection ash is 5-30%, the lead content is 1-4%, and the chlorine content is about 4%, if the dust collection ash is landfilled and discarded in a traditional way, the environment is polluted, and the human health is endangered. Dust collection ash in steel plants is a secondary resource with high recovery value, but is also one of the most difficult industrial solid wastes to be disposed of in the steel industry at present, especially electric furnace ash, which is classified into lead-containing waste class management according to the national hazardous waste directory (2018 edition) and hazardous waste code HW31 (312-001-31). The method has important economic value if the metallic iron and zinc in the dust can be separated and comprehensive utilization can be realized. Therefore, the recovery and utilization of the collected dust are carried out, so that not only can precious resources be fully utilized, but also the pollution of the collected dust to the environment can be reduced.

At present, the recovery of dust collection ash in steel works mainly comprises a fire method and a wet method. The wet process has long flow, low production efficiency, particularly high wastewater discharge, easy secondary pollution, high component requirement, difficult achievement of most of dust collection ash and high disposal cost. In the pyrogenic process, a rotary kiln high-temperature reduction volatilization process is mainly adopted, the recovery rate of valuable metals is low, and the production operation of the rotary kiln is seriously affected due to the high iron content in the dust collection ash and the large liquid phase quantity in the kiln during calcination; meanwhile, the product quality is poor, the fuel consumption is high, and the energy utilization rate is low. In recent years, the pyrogenic process adopts new processes and equipment such as a rotary hearth furnace or a microwave oven, and the like, and has not been effectively popularized because of high equipment cost and high production cost by adopting fuel gas or electric energy as energy.

The invention patent CN 106191453B discloses a method for recovering zinc concentrate and potassium chloride by utilizing rotary hearth furnace dust, which comprises the steps of firstly soaking the rotary hearth furnace dust with water, pulping and leaching, carrying out solid-liquid separation on leached slurry, and then washing and drying the obtained solid.

The invention patent CN 102899505A discloses a method and a device for recovering zinc by utilizing a rotary kiln, which are characterized in that blast furnace ash, electric furnace ash, anthracite and gas mud are mixed and then sent into the rotary kiln for high-temperature combustion, so that zinc forms gasified zinc, then the gasified zinc is cooled and dust is removed, the gasified zinc is cooled and oxidized in air, and then sent into a dust collection chamber for recovery. The method has low zinc recovery efficiency, high iron content in blast furnace ash and electric furnace ash, large liquid phase amount in the kiln during calcination, easy caking and serious influence on the production operation of the rotary kiln.

The two methods have low production efficiency and high energy consumption cost, zinc in the dust collection ash is not effectively recovered, and secondary pollution is easy to generate in the recovery process.

Disclosure of Invention

In order to overcome the problems in the prior art, the invention provides a dust collecting ash system and a dust collecting ash method for a chain-plate type high-temperature reduction furnace for treating iron and steel plants, which are characterized in that on the premise of meeting the requirements of environmental protection and safe production, dust collecting ash of the iron and steel plants is ground, immersed and washed and then subjected to granulation, lead and zinc components in the dust collecting ash are volatilized into flue gas through evaporation, preheating and high-temperature reduction, the flue gas containing zinc oxide and lead oxide powder is obtained through oxidation, finally zinc oxide and lead oxide powder are recovered from the flue gas through the dust collecting ash, slag obtained through sintering is subjected to cooling, crushing and magnetic separation to recover iron powder, and the residual slag is used as a raw material of building materials, so that harmless and recycling disposal of the dust collecting ash of the iron and steel plants is realized, secondary pollution risks are completely eliminated, and the production is safe.

In order to achieve the above purpose, the present invention is realized by the following technical scheme:

a dust collection and ash system for a chain-plate type high-temperature reduction furnace disposal steel plant comprises a washing dechlorination system, a balling and granulating system, a volatile zinc extraction system and a flue gas treatment system; the washing dechlorination system, the balling granulation system and the volatile zinc extraction system are connected in sequence, the flue gas treatment system is connected with the volatile zinc extraction system, devices in the system are all sealing devices, and a suction machine is arranged for forming micro negative pressure; the volatilizing zinc extracting system comprises a chain plate type high-temperature reduction furnace, an oxidation chamber, a salt water evaporation and flue gas sedimentation machine, a high-temperature electrostatic dust collector and a solid warehouse which are sequentially connected, wherein the Gao Wenjing electric dust collector is connected with the chain plate type high-temperature reduction furnace through an exhaust fan.

Further, the chain plate type high-temperature reduction furnace comprises a furnace body and a cavity formed by wrapping the furnace body, wherein the cavity consists of an evaporation preheating part, a high-temperature reduction part and a cooling part.

Further, the evaporation preheating part and the cooling part are positioned on one side of the furnace body, the high-temperature reduction part is positioned on the other side of the furnace body, the evaporation preheating part is positioned above the cooling part, a flue gas chamber is arranged between the evaporation preheating part and the cooling part, and the evaporation preheating part, the high-temperature reduction part and the cooling part are respectively provided with a first chain plate machine, a second chain plate machine and a third chain plate machine.

Further, the upper part of the evaporation preheating part is provided with a first feed inlet and a first smoke outlet, and the lower part of the evaporation preheating part is provided with at least one first chain plate machine.

Further, the evaporation preheating part is communicated with the high-temperature reduction part, and a second feed inlet is arranged at the communication part of the evaporation preheating part.

Further, the upper portion of the high-temperature reduction part is provided with a second flue gas outlet, the middle portion of the high-temperature reduction part is provided with at least one second chain plate machine, the lower portion of the high-temperature reduction part is provided with an ash collecting hopper, the lower portion of the ash collecting hopper is provided with at least one first ash outlet, and the first ash outlet is connected with a solid slag warehouse.

Further, the high-temperature reduction part is communicated with the cooling part, and a third feed inlet is arranged at the communication part of the high-temperature reduction part.

Further, the high-temperature reduction part is provided with at least one fuel nozzle, and the fuel nozzles are arranged at the upper furnace body of the second chain plate machine.

Further, a sealed air chamber is arranged outside the second chain plate machine of the high-temperature reduction part, the sealed air chamber is of a cuboid structure, a plurality of high-pressure air inlet holes are formed in the side face of the sealed air chamber, and at least one exhaust hole is formed in the upper portion of the sealed air chamber.

Further, the upper portion of the cooling part is provided with an air outlet, the lower portion of the cooling part is provided with at least one plenum chamber, the middle portion of the cooling part is provided with at least one third chain plate machine, and a material falling position of the third chain plate machine is provided with a material outlet.

Further, a second ash outlet is formed in the bottom of each plenum chamber, an air inlet is formed in the side wall of each plenum chamber, and partition walls are arranged between different plenum chambers.

Further, the second ash outlet is connected with a solid slag warehouse.

Further, the distance between the first chain plate machine, the second chain plate machine and the third chain plate machine and the top surface of the furnace body is 0.3-1 times of the width of the chain plate machine.

Further, when the number of the first chain plate machine, the second chain plate machine and the third chain plate machine is 2 or more, respectively, the distance between the first chain plate machine and the first chain plate machine, the distance between the second chain plate machine and the second chain plate machine or the distance between the third chain plate machine and the third chain plate machine is 0.3-1 times of the width of the chain plate machine.

Further, fire-resistant material layers are adhered to the running chain plates of the first chain plate machine, the second chain plate machine and the third chain plate machine.

Further, the length of the furnace body is less than or equal to 30m, the width is less than or equal to 5m,

further, the flue gas chamber is of an inverted horn shape, an opening at the lower part is connected with the cooling part, and a hot flue gas inlet is arranged in the middle.

Further, the shell of the furnace body comprises a steel shell body, a heat-insulating material layer covered on the shell body and a refractory brick layer covered on the heat-insulating material layer, and the heat-insulating material layer and the refractory brick layer are fixed on the shell by palladium nails.

Further, the chain plate type high-temperature reduction furnace is provided with an overhaul platform, a pressure monitor mounting hole and a temperature monitor mounting hole, the overhaul platform comprises stairs and an overhaul door, and the chain plate type high-temperature reduction furnace is fixed on a building through a bracket.

Further, the brine evaporation and flue gas sedimentation machine comprises a high-temperature flue gas chamber, a brine evaporation chamber and a flue gas sedimentation chamber from top to bottom, wherein the brine evaporation chamber comprises two groups of high-temperature flue gas pipelines and a brine bin, the high-temperature flue gas pipelines are positioned in the brine bin, a flue gas outlet, a water vapor outlet and a flue gas inlet are formed in the upper part of the high-temperature flue gas chamber, and the flue gas outlet is connected with an exhaust fan; the top of the side wall of the brine bin is provided with a brine inlet, the bottom of the side wall of the brine bin is provided with a concentrated brine outlet, the concentrated brine outlet is connected with a brine pond, and the flue gas settling chamber comprises a settling separation chamber, an ash collecting hopper and an ash outlet from top to bottom.

Further, each group of high-temperature flue gas pipelines is at least 9, the thickness of the pipeline is 6-12 mm, the diameter of the pipeline is 20-1000 cm, and the high-temperature flue gas pipelines are also provided with a compressed air blocking blowing mechanism for preventing dust accumulation of the pipeline.

Further, the bottom surface of the brine bin is provided with an inclined surface inclined towards the concentrated brine outlet, and the inclined angle is not smaller than 1 degree.

Further, the high-temperature flue gas pipeline is connected with the high-temperature flue gas chamber and the flue gas settling chamber through flanges; the high-temperature flue gas pipeline is connected with the salt water bin through a sleeve, the diameter of the sleeve is 10-20 mm larger than that of the flue gas pipeline, and the height of the sleeve is 10-20 cm.

Further, the high-temperature flue gas chamber, the flue gas settling chamber, the steam outlet, the brine inlet and the concentrated brine outlet are provided with a temperature monitor, a pressure monitor and a flow monitor, an upper material level monitor and a lower material level monitor are arranged in the brine bin, and the temperature monitor, the pressure monitor, the flow monitor and the upper material level monitor are respectively connected with a peripheral computer control system.

Further, the washing dechlorination system comprises a discharging room, a plate type feeding machine, a raw material storage warehouse, a belt metering scale, a belt conveyor, a first iron remover, a wet ball mill, a slurry pond, a second iron remover, a solid-liquid separation device and a filter cake storage warehouse which are connected in sequence; the solid-liquid separation device is connected with the wet ball mill.

Further, the raw material storage warehouse is a closed silo, the top is provided with a feed inlet, the bottom is provided with a discharge outlet, and the number of the raw material storage warehouse is at least 2.

Further, the plate type feeder is connected with a feed inlet of the raw material storage warehouse through a lifting machine.

Further, the wet ball mill is a steel ball mill or a steel rod mill.

Further, the solid-liquid separation device is one or a combination of a plurality of plate-and-frame filter presses, belt filter presses, thickeners or spiral filters.

Further, the balling granulation system comprises an auxiliary agent bin, a reducing agent bin, a belt weighing scale, a belt conveyor, a homogenizing mixer and a balling machine which are connected in sequence.

Further, the auxiliary agent bin and the reducing agent bin are airtight cylinder bins, and the discharge holes at the bottoms of the auxiliary agent bin, the reducing agent bin and the filter cake storage bin are respectively connected with the belt metering scale.

Further, the homogenizing mixer is one or a combination of a plurality of double-shaft mixers, a wheel grinder and a concrete mixer.

Further, the granulator is one or two of a balling disc and a pair-roller extrusion balling machine.

Further, the sphere diameter of the sphere forming machine is 5-15 mm.

Further, the flue gas treatment system comprises a bag dust collector, an exhaust fan and a flue gas desulfurization and chlorination system which are sequentially connected, and the flue gas desulfurization and chlorination system comprises a medicament blending tank, a medicament delivery pump and a sedimentation tank which are sequentially connected; the cloth bag dust collector is a dewing high temperature resistant cloth bag dust collector.

The invention aims to provide a method for disposing dust collection ash of a steel plant by a chain-plate type high-temperature reduction furnace, which comprises the following steps of:

s1, washing and dechlorination: grinding and washing the dust collection ash into fine powder slurry with the particle size smaller than 80um, and filtering to obtain a filter cake and filtrate;

s2, granulating by ball forming: preparing the filter cake obtained in the step S1, a reducing agent and an auxiliary agent into balls with the particle size of 5-15 mm;

s3, volatilizing and extracting zinc: feeding the pellets prepared in the step S2 into a chain plate type high-temperature reduction furnace for high-temperature calcination to obtain solid slag and lead-zinc-containing high-temperature flue gas;

s4, flue gas treatment: oxidizing the high-temperature smoke containing lead and zinc obtained in the step S3 to obtain high-temperature smoke containing zinc oxide and lead oxide solids, cooling and dedusting the high-temperature smoke through a brine evaporation and smoke sedimentation machine to obtain lead and zinc dust and high-temperature smoke, and then performing desulfurization and chlorine purification treatment on the high-temperature smoke to serve as a drying heat source of an evaporation preheating part of a chain plate type high-temperature reduction furnace; the flue gas discharged from the high-temperature reduction part of the high-temperature chain scraper is discharged after dust removal, desulfurization and chlorine treatment, and the recovered dust is pelletized and granulated to prepare pellets and then is sent into the chain plate type high-temperature reduction furnace again.

The working principle of the invention is as follows:

Wet grinding, soaking and washing dust collecting ash in iron and steel plant to obtain fine powder with particle size smaller than 80 microns, washing to eliminate chlorine, adding soluble chlorine salt into the solution, homogenizing and stirring the filter cake, reductant and assistant, pelletizing, feeding the material pellets into chain plate type high temperature reducing furnace, evaporating water under the action of high temperature fume. Because the evaporation preheating part is wet and ash leakage does not occur, the ash collecting device is not arranged in the evaporation preheating part, coal in the pellets entering the high-temperature reduction part starts to burn at about 400 ℃, because the device adopts an anoxic burning mode, in order to ensure the combustion in the furnace and the requirement of the reducing atmosphere, the fuel of the high-temperature reduction part adopts high-temperature circulating flue gas and air to mix and support combustion, so that the oxygen content is ensured to be less than 15%, the carbon dioxide content is high, the anoxic burning can be ensured, carbon monoxide is generated after the coal burns, the high-temperature reduction part can not have oxygen, the coal content in the reduction part is high, under the high-temperature condition (the temperature in the furnace is more than 950 ℃), part of carbon and materials are contacted to generate carbon thermal reduction, and part of materials are contacted with carbon monoxide in the gas to generate gas-solid reaction, zinc, lead and other oxides are reduced into metal, and the zinc and lead oxides are discharged from a flue gas outlet at the top of the high-temperature reduction part at 600 ℃ to separate from solids. The separated high-temperature flue gas containing lead and zinc is added with air and then oxidized into zinc oxide and lead oxide solid, carbon monoxide is completely combusted in the air, solid powder is discharged from the lower part of the oxidation chamber, the high-temperature flue gas is discharged from a flue gas outlet of the oxidation chamber and then enters a brine evaporation and flue gas sedimentation machine, the evaporated brine absorbs heat to cool the flue gas, and the concentrated brine is further treated. The high-temperature flue gas from the flue gas outlet of the brine evaporation and flue gas sedimentation machine enters a high-temperature electrostatic dust collector for purification, is discharged through a high-temperature exhaust fan and then is sent into a chain plate type high-temperature reduction furnace for evaporating material pellets in the preheating part.

The beneficial effects of the invention are as follows:

(1) The invention designs a chain plate type high-temperature reduction furnace as main cremation and refining equipment aiming at the characteristics of dust collection ash in steel plants, adopts a carbothermic reduction method, and has the advantages of high reaction speed, high reduction efficiency, complete combustion, high extraction rate of lead and zinc in the dust collection ash and less residue in slag, and the reducing agent is in close contact with materials. The reduction reaction is mainly solid-state reaction, and the required flue gas amount is small, so that the concentration of lead and zinc in the flue gas exhausted by the equipment is high, the purity of a lead and zinc recovery product is improved, and the hidden trouble that the safety operation of the equipment is influenced due to agglomeration in a kiln in the traditional combustion method is solved.

(2) The invention carries out harmless and recycling treatment on the dust collection ash of the steel plant by a scientific and systematic method, and the treatment process is operated in a closed device and a negative pressure environment and is treated by adopting high-efficiency dust removal equipment without dust pollution. The acid gas with strong corrosiveness such as a small amount of sulfur, chlorine and the like which possibly are generated in the invention can be completely absorbed and solidified through strong alkali, and can not be discharged to the outside.

(3) In the invention, the flue gas subjected to brine evaporation and temperature reduction by the flue gas sedimentation machine is also sent into a chain plate type high-temperature reduction furnace for evaporating material pellets in the preheating part after dust collection treatment; carrying out secondary solid-liquid separation on the liquid generated by the primary solid-liquid separation after sedimentation treatment, sending the generated liquid into a wet ball mill to be used as grinding water, and transporting the solid slag obtained after combustion of a chain plate type high-temperature reduction furnace to a cement plant to be used as an iron correction raw material or returning the solid slag to the iron plant to be used as an iron-making raw material; the waste water, waste gas and waste residue in the treatment process can be recycled and effectively utilized, secondary discharge is avoided, and the possibility of secondary pollution is thoroughly eliminated. The method fully utilizes the dust collection ash of the steel plant to produce zinc oxide and iron powder with high added value, ensures that steel resources are not wasted, and creates obvious social and economic benefits.

(4) After passing through the salt water evaporation and flue gas sedimentation system, the high Wen Hanxin lead flue gas produced by the invention is separated into dust by using a high-temperature electrostatic dust collector method, and compared with the traditional sedimentation separation method, the dust content in the flue gas can be effectively controlled, so that the purity of the product is improved.

Drawings

FIG. 1 is a schematic diagram of a dust collection system of a steel plant for disposal by a chain-plate type high-temperature reduction furnace;

FIG. 2 is a schematic diagram showing the connection of a washing dechlorination system and a balling system;

FIG. 3 is a schematic diagram of a chain-plate type high-temperature reduction furnace structure;

FIG. 4 is a schematic view of the internal structure of the high temperature reduction section;

FIG. 5 is a schematic view of a housing construction;

FIG. 6 is a schematic diagram of the brine evaporating chamber and the flue gas settling chamber;

FIG. 7 is a top view of the brine evaporating chamber and the flue gas settling chamber;

the above reference numerals:

101. a discharging room; 102. a plate feeder; 103. a raw material repository; 104. a belt weighing scale; 105. a belt conveyor; 106. a first iron remover; 107. a wet ball mill; 108. a slurry pool; 109. a second iron remover; 110. a belt filter press; 111. a filtrate treatment tank; 112. a stirring tank; 113. a thickener; 114. a plate and frame filter press; 115. a filter cake storage bin;

201. an auxiliary agent bin; 202. a reducing agent bin; 203. a belt weighing scale; 204. a belt conveyor; 205. a homogenizing mixer; 206. a balling machine;

301. A chain plate type high-temperature reduction furnace; 302. an oxidation chamber; 303. brine evaporation and flue gas sedimentation machine; 304. a high temperature electrostatic precipitator; 305. a solids library; 306. an exhaust fan; 307. a slag warehouse;

3011. an evaporation preheating part; 3012. a high-temperature reduction unit; 3013. a cooling unit; 3014. a flue gas chamber; 30141. a hot flue gas inlet;

30111. a first feed port; 30112. a first flue gas outlet; 30113. a first plate link machine; 30114. a second feed inlet;

30121. a second flue gas outlet; 30122. a second plate link machine; 30123. an ash collecting hopper; 30124. a first ash outlet; 30125. a third feed inlet; 30126. a fuel nozzle; 30127. sealing the air chamber;

301271, high pressure air intake; 301272, vent holes;

30131. an air outlet; 30132. a plenum chamber; 30133. a third plate link machine; 30134. a discharge port;

301321, a second ash outlet; 301322, air inlet; 301323, partition walls;

3015. a housing body; 3016. a layer of thermal insulation material; 3017. a layer of firebrick; 3018. a palladium nail;

3031. a high temperature flue gas chamber; 3032. a brine evaporation chamber; 3033. a flue gas settling chamber;

30311. a flue gas outlet; 30312. a water vapor outlet; 30313. a flue gas inlet;

30321. a high temperature flue gas duct; 30322. a brine bin;

303221, saline inlet; 303222, concentrated brine outlet;

30331. a sedimentation separation chamber; 30332. an ash collecting hopper; 30333. an ash outlet;

401. a cloth bag dust collector; 402. a flue gas desulfurization chlorine system; 4021. and a medicament blending pool.

Detailed Description

The present invention will be described in further detail with reference to the drawings and the embodiments, in order to make the objects, technical solutions and advantages of the present invention more apparent.

As shown in fig. 1-7, the embodiment provides a dust collecting and ash system for a steel plant, which comprises a washing and dechlorination system, a balling and granulating system, a volatile zinc extracting system and a flue gas treatment system, wherein the dust collecting and ash system is arranged in a chain plate type high-temperature reduction furnace; the device in the system adopts a sealing device and is provided with a suction machine for forming micro negative pressure.

The washing dechlorination system comprises a discharging room 101, a plate feeder 102, a raw material storage warehouse 103, a belt weighing scale 104, a belt conveyor 105, a first iron remover 106, a wet ball mill 107, a slurry tank 108, a second iron remover 109, a belt filter press 110, a filtrate treatment tank 111, a stirring tank 112, a thickener 113, a plate-and-frame filter press 114 and a filter cake storage warehouse 115. The raw material storage 103 is a closed silo, which is provided with 3 raw material storages, can respectively store blast furnace ash, electric furnace ash and converter ash, the top of the raw material storage 103 is provided with a feed inlet, and the bottom is provided with a discharge outlet; the wet ball mill 107 is a steel ball mill or a steel rod mill.

The pelletizing and granulating system comprises an auxiliary agent bin 201, a reducing agent bin 202, a belt metering scale 203, a belt conveyor 204, a homogenizing mixer 205 and a pelletizer 206 which are sequentially connected, wherein the auxiliary agent bin 201 and the reducing agent bin 202 are closed cylindrical bins, the auxiliary agent bin 201 and the reducing agent bin 202 are connected with the belt metering scale 203 through a discharge hole at the bottom of the filter cake storage bin 115, and the belt metering scale 203 is connected with the belt conveyor 204.

Preferably, the homogenizing mixer 205 is one of a double-shaft mixer, a wheel grinder and a concrete mixer, the granulator 206 is one of a balling disc and a double-roller extrusion balling machine, and the particle size of the material pellets is 5-15 mm.

The volatilizing zinc extracting system comprises a chain plate type high-temperature reduction furnace 301, an oxidation chamber 302, a salt water evaporation and flue gas sedimentation machine 303, a high-temperature electrostatic dust collector 304 and a solid warehouse 305 which are sequentially connected, wherein the Gao Wenjing electric dust collector 304 is connected with the chain plate type high-temperature reduction furnace 301 through an exhaust fan 306.

The chain-plate type high-temperature reduction furnace 301 includes a furnace body and a cavity formed by wrapping the furnace body, and the cavity is composed of an evaporation preheating part 3011, a high-temperature reduction part 3012 and a cooling part 3013. The evaporation preheating part 3011 and the cooling part 3013 are arranged on one side of the furnace body, the high-temperature reduction part 3012 is arranged on the other side of the furnace body, the evaporation preheating part 3011 is arranged above the cooling part 3013, a flue gas chamber 3014 is arranged between the evaporation preheating part 3011 and the cooling part 3013, the evaporation preheating part 3011, the high-temperature reduction part 3012 and the cooling part 3013 are provided with chain plates, and a hot flue gas inlet 30141 is arranged in the middle of the flue gas chamber 3014.

The upper part of the evaporation preheating part 3011 is provided with a first feed port 30111 and a first flue gas outlet 30112, the lower part is provided with a first chain plate machine 30113, and the joint of the evaporation preheating part 3011 and the high-temperature reduction part 3012 is provided with a second feed port 30114.

The high temperature reduction part 3012 is of a cuboid structure, the upper part is provided with a second flue gas outlet 30121, the middle part is provided with a second chain plate machine 30122, the lower part is provided with an ash collecting hopper 30123, the lower part of the ash collecting hopper 30123 is provided with first ash outlets 30124, the number of the first ash outlets 30124 is at least one, the number of the first ash outlets 30124 is 4 in the embodiment, and the joint of the high temperature reduction part 3012 and the cooling part 3013 is provided with a third feed inlet 30125.

Preferably, the high temperature reduction part 3012 is provided with at least one of the fuel nozzles 30126, and the fuel nozzles 30126 are mounted at the upper furnace body of the second link plate 30122.

Preferably, the high temperature reduction portion 3012 is provided with a sealing air chamber 30127 outside the second link joint 30122, the sealing air chamber 30127 is of a cuboid structure, the installation position of the sealing air chamber 30127 is from the head pulley to the tail pulley of the second link joint 30122, a plurality of high-pressure air inlet holes 301271 are arranged on the side surface, at least one exhaust hole 301272 is arranged on the upper portion, and the sealing air chamber 30127 is arranged to cool the chain of the second link joint 30122 and prevent the second link joint from deforming due to high temperature.

The cooling part 3013 is provided with an air outlet 30131 for the upper part, a plenum 30132 is arranged at the lower part, a third chain plate machine 30133 is arranged in the middle, a discharge hole 30134 is arranged at the material falling position of the third chain plate machine 30133, a second ash outlet 301321 is arranged at the bottom of the plenum 30132, an air inlet 301322 is arranged on the side wall, at least one plenum 30132 is arranged, partition walls 301323 are arranged between different plenums 30132, and in the embodiment, the number of plenums is 3, at least one ash outlet is arranged at the lower part of each plenum, and the first ash outlet 30124 and the second ash outlet 301321 are connected with the slag warehouse 307.

Preferably, the distances between the first chain plate machine, the second chain plate machine and the third chain plate machine and the top surface of the furnace body of the evaporation preheating part 3011, the high-temperature reduction part 3012 and the cooling part 3013 are 0.3-1 times of the widths of the chain plate machines, and when the number of the first chain plate machine, the second chain plate machine and the third chain plate machine is 2 or more, respectively, the distances between the first chain plate machine and the first chain plate machine, the second chain plate machine and the second chain plate machine or the third chain plate machine are 0.3-1 times of the widths of the chain plate machines, and the running speed of the chain plate machines is 0.01-0.5 m/min. .

The chain plate machine is a known technology and comprises a chain plate, a transmission device, a power device and a tensioning device, wherein the transportation of materials mainly provides traction force through the cyclic reciprocating motion of a chain, and the materials are led to be transported along the horizontal direction or the inclined direction by using a metal plate as a supporting body in the transportation process.

Preferably, the length of the furnace body is less than or equal to 30m, and the width is less than or equal to 5m.

The casing that the flue gas chamber is close to one end of high temperature reduction portion, the casing at cooling portion top and the casing that high temperature reduction portion is close to flue gas chamber one end enclose into a triangle-shaped space, and wherein the second link joint tail end of high temperature reduction portion exposes in the triangle-shaped space, is convenient for install second link joint machine straining device and daily maintenance.

The shell of the furnace body comprises a steel shell body 3015, a heat-insulating material layer 3016 covered on the shell body and a refractory brick layer 3017 covered on the heat-insulating material layer, palladium nails 3018 are arranged between the heat-insulating material layer and the refractory brick layer, and when the furnace is specifically manufactured, the heat-insulating material is adhered to the steel shell body, then the refractory material is built, and the refractory material is selected according to the performance of combustion substances.

Preferably, the chain-plate type high-temperature reduction furnace is provided with an overhaul platform, a pressure monitor mounting hole and a temperature monitor mounting hole, wherein the overhaul platform comprises stairs and an overhaul door, and the chain-plate type high-temperature reduction furnace is fixed on a building through a bracket.

As shown in fig. 6-7, the brine evaporation and flue gas settling machine 303 comprises a high-temperature flue gas chamber 3031, a brine evaporation chamber 3032 and a flue gas settling chamber 3033 from top to bottom, the brine evaporation chamber 3032 comprises two groups of high-temperature flue gas pipelines 30321 and a brine bin 30322, the high-temperature flue gas pipelines 30321 are positioned in the brine bin 30322, a flue gas outlet 30311, a water vapor outlet 30312 and a flue gas inlet 30313 are arranged at the upper part of the high-temperature flue gas chamber 3031, and the flue gas outlet 30311 is connected with an exhaust fan; the upper part of the side wall of the brine bin 30322 is provided with a brine inlet 303221, and the bottom is provided with a concentrated brine outlet 303222, wherein the bottom surface of the brine bin 30322 is provided with an inclined surface inclined towards the direction of the concentrated brine outlet 303222, and the inclined angle is not less than 1 degree. The flue gas settling chamber 3033 comprises a settling separation chamber 30331, an ash collection bucket 30332 and an ash outlet 30333 from top to bottom.

Wherein each group of high temperature flue gas pipelines 30321 is at least 9, the thickness of the pipeline is 6-12 mm, the diameter of the pipeline is 20-1000 cm, and the high temperature flue gas pipeline 303211 is also provided with a compressed air blocking blowing mechanism for preventing the dust accumulation of the pipeline.

The high-temperature flue gas pipeline 30321 is connected with the high-temperature flue gas chamber 3031 and the flue gas settling chamber 3033 through flanges; the high-temperature flue gas pipeline 30321 is connected with the salt water bin 30322 through a sleeve, the diameter of the sleeve is 10-20 mm larger than that of the flue gas pipe, the height of the sleeve is 10-20 cm, the connecting part of the high-temperature flue gas pipeline 30321 and the high-temperature inlet and outlet flue gas chamber is provided with a refractory material layer, the thickness is 5-10 cm, and the high-temperature flue gas chamber and the flue gas settling chamber are internally provided with a heat preservation material layer and a refractory material layer in a conventional mode.

The high temperature flue gas chamber 3031, the flue gas settling chamber 3033, the steam outlet 30312, the salt water inlet 303221 and the concentrated salt water outlet 303222 are provided with a temperature monitor, a pressure monitor and a flow monitor, and an upper material level monitor and a lower material level monitor are arranged in the salt water bin, wherein the temperature monitor, the pressure monitor, the flow monitor and the upper material level monitor are respectively connected with a peripheral computer control system.

As shown in fig. 1, the flue gas treatment system comprises a bag dust collector 401, an exhaust fan and a flue gas desulfurization and chlorine system 402 which are sequentially connected, wherein the flue gas desulfurization and chlorine system 402 comprises a reagent deployment pool 4021, a reagent delivery pump and a sedimentation tank which are sequentially connected.

The embodiment also provides a method for disposing dust collection ash of a steel plant by a chain plate type high-temperature reduction furnace, which is characterized by comprising the following steps of:

The working process of the system is as follows:

the dust collection ash is conveyed into a feeding pit of a discharging room through a special conveying vehicle, conveyed to a lifting machine through a plate type feeding machine, conveyed to a raw material storage warehouse for storage through the action of the lifting machine, and provided with more than 2 raw material storage warehouses through different dust collection ash sources. After the materials are weighed by a belt metering scale, iron in the materials is removed by a first iron remover, the materials are conveyed into a wet ball mill by a belt conveyor, meanwhile, clear water with the quantity 1-2 times of the materials is added into the materials to be ground, stirred, ground and washed, and massive substances in the materials are ground into fine powder smaller than 80 mu m. The slurry obtained after grinding automatically flows into a slurry pool for storage, the slurry in the slurry pool is continuously removed by a second iron remover through a slurry pump, and the iron materials and iron selected by the first iron remover are returned to a steel plant together to be used as steelmaking raw materials. The slurry after iron removal is sent into a belt filter press to be filtered to obtain a mud cake and filtrate, the filtrate is sent into a thickener to be filtered for the second time after being settled by a filtrate treatment tank, the mud cake is sent into a stirring tank to be stirred after being added with clear water, the mud cake is filtered by the thickener and a plate-and-frame filter press after being stirred uniformly, a filter cake and the filtrate are obtained after being filtered by the plate-and-frame filter press, the water content of the filter cake is 20-30%, wherein the filter cake is sent into a filter cake storage bin, the filtrate is returned to the thickener to be reused, and at the moment, soluble chloride in the material enters the filtrate and is stored in the filtrate treatment tank.

The filter cake storage bin is weighed by a belt metering scale of a discharge hole at the bottom of the bin, the inside of the reducing agent bin is coke powder or anthracite with fixed carbon more than 78% and granularity less than 5mm, the inside of the auxiliary agent bin is one or more of lime, limestone, carbide slag, steel slag powder, sugar slag, starch, chaff and the like, and the mixture is conveyed into a homogenizing mixer by a belt conveyor to be stirred after being weighed by the belt metering scale of the discharge hole at the bottom of the reducing agent bin and the auxiliary agent bin, and then conveyed into a granulator to be made into granules with granularity of 5-15mm after being stirred uniformly.

The method comprises the steps of feeding pellets from a first feed inlet of an evaporation preheating part of a chain plate type high-temperature reduction furnace, under the movement of a first chain plate machine, evaporating moisture in the pellets under the heating of hot flue gas of a flue gas chamber at the lower part, discharging gas from a flue gas outlet at the top of the preheating evaporation part, moving dewatered carbon-containing pellets to the tail end of the first chain plate machine, and entering the high-temperature reduction part through a second discharge port.

Under the movement of the second chain plate machine, the temperature of the material ball entering the high-temperature reduction part is further increased, in order to ensure the temperature of the high-temperature reduction part, fuel is injected into a furnace through a fuel nozzle to generate heat, the material ball contains a large amount of coal, under the high-temperature condition (the temperature in the furnace is 950 ℃), a part of materials are contacted with carbon to generate carbon thermal reduction, and a part of materials are contacted with carbon monoxide in gas to generate gas-solid reaction, so that oxides such as zinc, lead and the like are reduced into metal, and the boiling point of the metallic zinc and the lead is low, and the metallic zinc and the lead are gas above 600 ℃, so that the metallic zinc and the lead enter the flue gas and are discharged from a flue gas outlet at the top of the high-temperature reduction part and enter an oxidation chamber. The solid slag obtained after combustion enters the cooling part from the third feed inlet under the drive of the second chain plate machine, and the tiny slag generated by combustion leaks down from the gaps of the chain plate machine, enters the ash bucket and is discharged through the first ash outlet.

The slag entering the cooling part is cooled under the action of high-pressure cold air entering the bottom plenum chamber under the movement of the third chain plate machine, at the moment, a small amount of unburned carbon remained in the slag is further combusted in the air, iron and ferric oxide are oxidized into ferric oxide, high-temperature flue gas after heat exchange enters the flue gas chamber from the air outlet at the top of the cooling chamber and is used as an evaporation heat source for preheating the evaporation part, cooled solid slag is discharged from the discharge hole under the driving of the third chain plate machine, fine slag leaks from the gaps of the chain plate machine, enters the plenum chamber and is discharged through the second ash outlet, and solid slag discharged from the first ash outlet, the second ash outlet and the discharge hole of the cooling part is conveyed to a solid slag warehouse for preservation and is conveyed to a cement plant to be used as an iron correction raw material or returned to a steel plant to be used as an ironmaking raw material.

The high-temperature flue gas containing lead and zinc discharged from the high-temperature reduction part has the temperature of more than 700 ℃, enters an oxidation chamber, is oxidized into zinc oxide and lead oxide solid after adding air, simultaneously, carbon monoxide in the high-temperature flue gas is completely combusted, the generated solid is discharged from the bottom of the oxidation chamber after settling and separating from the flue gas, and is sent into a solid warehouse for storage, and the high-temperature dust-containing flue gas enters a brine evaporation and flue gas settling machine through a flue gas outlet of the oxidation chamber.

High-temperature dust-containing flue gas (about 1000 ℃) enters a high-temperature flue gas pipeline from a flue gas inlet of a high-temperature flue gas chamber, industrial brine obtained by separation in a filtrate treatment tank enters a brine bin through a brine inlet, water is evaporated by heating of the high-temperature flue gas pipeline, and evaporated water vapor is collected for later use. The cooled dust-containing flue gas enters a bottom flue gas settling chamber, and due to the reduction of the air flow speed, solid-gas separation is generated, and solids are settled down into a bottom ash collecting hopper under the action of gravity, discharged through an ash outlet and sent into a solid warehouse for storage. The separated flue gas passes through another group of high-temperature flue gas pipelines, is discharged from a flue gas outlet of a high-temperature flue gas chamber at the top of the other group of high-temperature flue gas pipelines after the temperature of the brine is reduced, enters a high-temperature electrostatic dust collector for dust removal, and is sent into a chain plate type high-temperature reduction furnace through an exhaust fan to provide heat for an evaporation preheating part.

And the brine after evaporation and concentration in the brine bin is discharged from a concentrated brine outlet and then is sent into a brine pond for storage.

The flue gas discharged from a flue gas outlet at the top of the evaporation preheating part of the chain plate type high-temperature reduction furnace is purified by a cloth bag dust collector, the cloth bag dust collector adopts a dewing-resistant and high-temperature-resistant cloth bag dust collector, the temperature of the purified flue gas is less than 100 ℃, and the purified flue gas is sent into a flue gas desulfurization chlorine system, wherein the flue gas desulfurization chlorine method is to wash desulfurization chlorine and lime sedimentation by using strong alkali. The prepared alkali solution in the medicament preparation tank is conveyed into a sedimentation tank of a sedimentation tank by a medicament conveying pump, and after the reaction is completed, the obtained solid is desulfurized gypsum, and can be used as raw materials of cement plants, the upper liquid is chloride-containing brine, and the upper liquid is conveyed into a filtrate treatment tank to be used as brine for continuous recycling.

The working principle of the invention is as follows:

wet grinding dust collecting ash in iron and steel plant to obtain fine powder with particle size smaller than 80 microns, washing to eliminate chlorine, adding soluble chloride into the solution, homogenizing and stirring the filter cake, reductant and assistant, pelletizing, feeding the material pellets into chain plate type high temperature reducing furnace, evaporating water under the action of high temperature fume. Because the evaporation preheating part is wet and ash leakage does not occur, the ash collecting device is not arranged in the evaporation preheating part, coal in the pellets entering the high-temperature reduction part starts to burn at about 400 ℃, because the device adopts an anoxic burning mode, in order to ensure the combustion in the furnace and the requirement of the reducing atmosphere, the fuel of the high-temperature reduction part adopts high-temperature circulating flue gas and air to mix and support combustion, so that the oxygen content is ensured to be less than 15%, the carbon dioxide content is high, the anoxic burning can be ensured, carbon monoxide is generated after the coal burns, the high-temperature reduction part can not have oxygen, the coal content in the reduction part is high, under the high-temperature condition (the temperature in the furnace is more than 950 ℃), part of carbon and materials are contacted to generate carbon thermal reduction, and part of materials are contacted with carbon monoxide in the gas to generate gas-solid reaction, zinc, lead and other oxides are reduced into metal, and the zinc and lead oxides are discharged from a flue gas outlet at the top of the high-temperature reduction part at 600 ℃ to separate from solids. The high-temperature flue gas containing lead and zinc after threshing is added with air and then oxidized into zinc oxide and lead oxide solid, carbon monoxide is completely combusted in the air and discharged from the lower part of the oxidation chamber, the high-temperature flue gas is discharged from a flue gas outlet of the oxidation chamber and then enters a brine evaporation and flue gas sedimentation machine, the evaporated brine absorbs heat to cool the flue gas, and the concentrated brine is further treated. The high-temperature flue gas from the flue gas outlet of the brine evaporation and flue gas sedimentation machine enters a high-temperature electrostatic dust collector for purification, is discharged through a high-temperature exhaust fan and then is sent into a chain plate type high-temperature reduction furnace for evaporating material pellets in the preheating part.

The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.

Claims

1. The system is characterized by comprising a washing dechlorination system, a balling and granulating system, a volatile zinc extraction system and a flue gas treatment system; the washing dechlorination system, the balling granulation system and the volatile zinc extraction system are connected in sequence, the flue gas treatment system is connected with the volatile zinc extraction system, devices in the system are all sealing devices, and a suction machine is arranged for forming micro negative pressure;

the volatilizing zinc extracting system comprises a chain plate type high-temperature reduction furnace, an oxidation chamber, a salt water evaporation and flue gas sedimentation machine, a high-temperature electrostatic dust collector and a solid warehouse which are sequentially connected, wherein the Gao Wenjing electric dust collector is connected with the chain plate type high-temperature reduction furnace through an exhaust fan.

2. The dust collecting and ash system of the steel plant treated by the chain-plate type high-temperature reduction furnace according to claim 1, wherein the chain-plate type high-temperature reduction furnace comprises a furnace body and a cavity formed by wrapping the furnace body, and the cavity consists of an evaporation preheating part, a high-temperature reduction part and a cooling part;

The evaporation preheating part and the cooling part are positioned on one side of the furnace body, the high-temperature reduction part is positioned on the other side of the furnace body, the evaporation preheating part is positioned above the cooling part, a flue gas chamber is arranged between the evaporation preheating part and the cooling part, and the evaporation preheating part, the high-temperature reduction part and the cooling part are respectively provided with a first chain plate machine, a second chain plate machine and a third chain plate machine.

3. The dust collecting and ash disposal system of a steel plant for a chain-plate type high-temperature reduction furnace according to claim 2, wherein the upper part of the evaporation preheating part is provided with a first feed inlet and a first flue gas outlet, and the lower part is provided with at least one first chain plate machine; the evaporation preheating part is communicated with the high-temperature reduction part, and a second feed inlet is formed in the communication part of the evaporation preheating part.

4. The dust collection ash system of the steel plant treated by the chain-plate type high-temperature reduction furnace according to claim 2, wherein the upper part of the high-temperature reduction part is provided with a second smoke outlet, the middle part is provided with at least one second chain plate machine, the lower part is provided with an ash collection hopper, the lower part of the ash collection hopper is provided with at least one first ash outlet, and the first ash outlet is connected with a solid slag warehouse;

the high-temperature reduction part is communicated with the cooling part, and a third feed inlet is arranged at the communication part of the high-temperature reduction part;

The high-temperature reduction part is provided with at least one fuel nozzle, and the fuel nozzles are arranged at the furnace body above the second chain plate machine;

the outside of high temperature reduction portion second chain trigger is equipped with sealed air chamber, sealed air chamber is the cuboid structure, and the side is equipped with a plurality of high-pressure air inlet holes, and upper portion is equipped with at least one exhaust hole.

5. The dust collection and ash disposal system for the steel plant of the chain plate type high-temperature reduction furnace according to claim 2, wherein the upper part of the cooling part is provided with an air outlet, the lower part of the cooling part is provided with at least one plenum chamber, the middle part of the cooling part is provided with at least one third chain plate machine, and the material falling part of the third chain plate machine is provided with a discharge hole;

the bottom of each plenum chamber is provided with a second ash outlet, and the side wall of each plenum chamber is provided with an air inlet; partition walls are arranged between different inflatable chambers, and the second ash outlet is connected with a solid slag warehouse.

6. The dust collection and ash disposal system for a steel plant of a chain plate type high-temperature reduction furnace according to claim 2, wherein the distance between the first chain plate machine, the second chain plate machine and the third chain plate machine and the top surface of the furnace body is 0.3-1 times of the width of the chain plate machine;

when the number of the first chain plate machine, the second chain plate machine and the third chain plate machine is more than 2 respectively, the distance between the first chain plate machine and the first chain plate machine, the distance between the second chain plate machine and the second chain plate machine or the distance between the third chain plate machine and the third chain plate machine is 0.3-1 times of the width of the chain plate machine;

A fire-resistant material layer is stuck on the running chain plates of the first chain plate machine, the second chain plate machine and the third chain plate machine;

the length of the furnace body is less than or equal to 30m, and the width is less than or equal to 5m.

7. The dust collecting and ash reducing system for steel works disposal by a chain-plate type high temperature reducing furnace according to claim 2, wherein the flue gas chamber is of an inverted horn shape, the lower opening is connected with the cooling part, and the middle part is provided with a hot flue gas inlet.

8. The dust collecting and ash handling system of a steel plant for a chain-plate type high temperature reduction furnace according to claim 2, wherein the shell of the furnace body comprises a steel shell body, a heat preservation material layer covered on the shell body and a refractory brick layer covered on the heat preservation material layer, and the heat preservation material layer and the refractory brick layer are fixed on the shell by palladium nails.

9. The dust collecting ash system of a steel plant for disposal of a chain-plate type high-temperature reduction furnace according to claim 1 or 2, wherein the chain-plate type high-temperature reduction furnace is provided with an overhaul platform, a pressure monitor mounting hole and a temperature monitor mounting hole, the overhaul platform comprises a stair and an overhaul door, and the chain-plate type high-temperature reduction furnace is fixed on a building through a bracket.

10. The dust collection ash system of the steel plant treated by the chain-plate type high-temperature reduction furnace according to claim 1, wherein the brine evaporation and flue gas sedimentation machine comprises a high-temperature flue gas chamber, a brine evaporation chamber and a flue gas sedimentation chamber from top to bottom, the brine evaporation chamber comprises two groups of high-temperature flue gas pipelines and a brine bin, the high-temperature flue gas pipelines are positioned in the brine bin, a flue gas outlet, a water vapor outlet and a flue gas inlet are formed in the upper part of the high-temperature flue gas chamber, and the flue gas outlet is connected with an exhaust fan; the top of the side wall of the brine bin is provided with a brine inlet, the bottom of the side wall of the brine bin is provided with a concentrated brine outlet, the concentrated brine outlet is connected with a brine pond, and the flue gas settling chamber comprises a settling separation chamber, an ash collecting hopper and an ash outlet from top to bottom.

11. The dust collecting and ash handling system for a steel plant according to claim 10, wherein each group of high-temperature flue gas pipelines is at least 9, the thickness of the pipeline is 6-12 mm, the diameter of the pipeline is 20-1000 cm, and the high-temperature flue gas pipelines are further provided with a compressed air blocking blowing mechanism for preventing dust accumulation of the pipeline.

12. The dust collecting and ash handling system of a steel plant for a chain-plate type high temperature reduction furnace according to claim 10, wherein the bottom surface of the brine bin is provided as a slope inclined to the direction of the concentrated brine outlet, and the inclination angle is not less than 1 °.

13. The dust collection and ash disposal system for steel works by a chain-plate type high-temperature reduction furnace according to claim 10, wherein the high-temperature flue gas pipeline is connected with the high-temperature flue gas chamber and the flue gas settling chamber through flanges; the high-temperature flue gas pipeline is connected with the salt water bin through a sleeve, the diameter of the sleeve is 10-20 mm larger than that of the flue gas pipeline, and the height of the sleeve is 10-20 cm.

14. The dust collection ash system of the steel plant treated by the chain-plate type high-temperature reduction furnace according to claim 10, wherein the high-temperature flue gas chamber, the flue gas settling chamber, the water vapor outlet, the brine inlet and the concentrated brine outlet are provided with a temperature monitor, a pressure monitor and a flow monitor, an upper material level monitor and a lower material level monitor are arranged in the brine bin, and the temperature monitor, the pressure monitor, the flow monitor and the upper material level monitor are respectively connected with a peripheral computer control system.

15. The dust collection and ash disposal system of a steel plant for a chain-plate type high-temperature reduction furnace according to claim 1, wherein the washing and dechlorination system comprises a discharging room, a plate type feeder, a raw material storage warehouse, a belt weighing scale, a belt conveyor, a first iron remover, a wet ball mill, a slurry pond, a second iron remover, a solid-liquid separation device and a filter cake storage warehouse which are connected in sequence; the solid-liquid separation device is connected with the wet ball mill;

the raw material storage bins are closed cylindrical bins, the top of each raw material storage bin is provided with a feed inlet, the bottom of each raw material storage bin is provided with a discharge outlet, and the number of the raw material storage bins is at least 2;

the plate type feeding machine is connected with a feeding port of the raw material storage warehouse through a lifting machine;

the wet ball mill is a steel ball mill or a steel bar mill;

the solid-liquid separation device is one or a combination of a plurality of plate-and-frame filter presses, belt filter presses, thickeners or spiral filters.

16. The dust collection and ash system for the steel plant treated by the chain-plate type high-temperature reduction furnace according to claim 1, wherein the balling and granulating system comprises an auxiliary agent bin, a reducing agent bin, a belt metering scale, a belt conveyor, a homogenizing mixer and a balling machine which are connected in sequence;

the auxiliary agent bin and the reducing agent bin are airtight cylinder bins, and the auxiliary agent bin, the reducing agent bin and the discharging hole at the bottom of the filter cake storage bin are respectively connected with the belt metering scale;

The homogenizing mixer is one or a combination of a plurality of double-shaft mixer, a wheel grinder and a concrete mixer;

the balling machine is one or two combinations of a balling disc and a pair-roller extrusion balling machine;

the particle size of the ball forming machine is 5-15 mm.

17. The dust collection and ash treatment system for a steel plant, which is treated by the chain-plate type high-temperature reduction furnace according to claim 1, wherein the flue gas treatment system comprises a bag dust collector, an exhaust fan and a flue gas desulfurization and chlorine system which are connected in sequence;

the flue gas desulfurization chlorine system comprises a reagent blending tank, a reagent conveying pump and a sedimentation tank which are connected in sequence;

the cloth bag dust collector is a dewing high temperature resistant cloth bag dust collector.

18. A dust collecting method for disposing a dust collecting system of a steel plant based on the link plate type high temperature reduction furnace according to any one of claims 1 to 17, comprising the steps of: