CN211345342U - Circulating fluidized bed boiler mixes burns electrolytic aluminum waste material and gives up processing system admittedly - Google Patents
Circulating fluidized bed boiler mixes burns electrolytic aluminum waste material and gives up processing system admittedly Download PDFInfo
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- CN211345342U CN211345342U CN201922284104.0U CN201922284104U CN211345342U CN 211345342 U CN211345342 U CN 211345342U CN 201922284104 U CN201922284104 U CN 201922284104U CN 211345342 U CN211345342 U CN 211345342U
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Abstract
The utility model discloses a circulating fluidized bed boiler mixes burns electrolytic aluminum waste material and gives up processing system admittedly belongs to industry and gives up admittedly and metallurgical waste utilization technical field. And respectively conveying the crushed electrolytic aluminum waste material and the limestone powder to a blending system through a pneumatic conveying system for blending, and then conveying the mixture to a circulating fluidized bed boiler through a conveying system for blending and burning. The method has the advantages of simple operation, high automation degree, easy centralized control, low requirement on raw material processing, large treatment capacity and long conveying distance, realizes harmless treatment of the electrolytic aluminum waste through doped combustion, can reduce the pollution of toxic solid waste to land and water resources, simultaneously recovers heat in the electrolytic aluminum waste, and realizes huge social benefit and economic benefit.
Description
Technical Field
The utility model belongs to the technical field of industry is useless admittedly and metallurgical discarded object utilizes, concretely relates to circulating fluidized bed boiler mixes burns electrolytic aluminum waste material and gives up processing system admittedly.
Background
The electrolytic aluminum waste is a general term for waste generated in the production process of electrolytic aluminum, and comprises the following steps: the global aluminum yield is always kept to increase year by year through the waste cathode carbon blocks and the waste anode materials, the aluminum yield is increased from 1965 ten thousand tons in 1994 to 5889 ten thousand tons in 2016, the technology and equipment level of aluminum production industries of various countries in the world is continuously improved along with the continuous promotion of the global big development process, the subsequent electrolytic aluminum waste is also generated in large quantity, generally, electrolytic aluminum production enterprises can overhaul electrolytic cells in five years, a large quantity of waste materials are generated in the process, generally, 10-15 Kg of waste cathode carbon blocks are generated in each ton of raw aluminum in the electrolytic aluminum production process, according to the data, 23.08 million tons of waste cathodes are generated in 2018 all the year, namely 7 million tons of electrolytes are discarded every year, 7.5 million tons of cathode carbon are discarded, about 4 million tons of harmful fluorides and 500 tons of cyanides are disorganized and put into the natural environment, a large quantity of recyclable energy is wasted, but also immeasurable damage to land resources and underground water resources.
In 1988, the American environmental protection agency promulgated law evaluates the electrolytic aluminum waste tank lining as dangerous waste, in 1996, the direct landfill or open-air stockpiling of the waste tank lining is definitely forbidden, all electrolytic aluminum plants in active service are required to be properly treated, and as the F-content in the waste tank lining and the waste electrode generated in the electrolytic aluminum industry reaches 2000mg/L and CN-about 15mg/L, the national development and reform Committee lists the waste as the famous and famous records of national dangerous waste at 8/1 in 2008 according to the regulations of the national common people and State solid waste pollution environmental control Law.
Research shows that electrolytic aluminum waste (cathode and anode) has a certain heat value, and at present, the electrolytic aluminum waste is mainly treated in a safe landfill mode, which not only brings hidden danger to environmental safety, but also causes great resource waste.
Disclosure of Invention
In order to solve the existing problem, an object of the utility model is to provide a circulating fluidized bed boiler mixes burns electrolytic aluminum waste material and gives up processing system admittedly, when realizing electrolytic aluminum waste material innocent treatment, has retrieved solid waste heat volume, has reduced environmental pollution, has considerable economic benefits.
The utility model discloses a following technical scheme realizes:
the utility model discloses a solid waste treatment system for mixed combustion of electrolytic aluminum waste in a circulating fluidized bed boiler, which comprises an electrolytic aluminum waste multistage crushing system, a limestone powder feeding device, a pneumatic conveying system, a mixing system, a transmission system and a circulating fluidized bed boiler;
the multistage crushing system of electrolytic aluminum waste material and limestone powder feed device are connected to the blending system through pneumatic conveying system respectively, and the blending system is connected with the coal feeding belt of circulating fluidized bed boiler through transmission system.
Preferably, the multistage crushing system for electrolytic aluminum waste materials comprises three-stage crushing, wherein one-stage crushing is an air hammer crushing device, the second-stage crushing and the third-stage crushing are jaw crushers, and the maximum crushing grain size of the third-stage crushing is smaller than that of the second-stage crushing.
Preferably, the pneumatic conveying system comprises a pneumatic conveying pump and a conveying pipeline, and a plurality of slag discharging ports are arranged on the conveying pipeline; two conveying pipelines are arranged between the electrolytic aluminum waste multistage crushing system and the blending system, each conveying pipeline is independently connected with a pneumatic conveying pump, a connecting branch pipe is arranged between the two conveying pipelines, and a valve is arranged on the connecting branch pipe; the limestone feeding device is characterized in that two conveying pipelines are arranged between the limestone feeding device and the mixing system, each conveying pipeline is independently connected with a pneumatic conveying pump, a connecting branch pipe is arranged between the two conveying pipelines, and a valve is arranged on the connecting branch pipe.
Further preferably, the bent pipe section and the straight pipe section of the conveying pipeline are connected through a rapid discharging and disassembling device, and sealing gaskets are arranged between the rapid discharging and disassembling device and the bent pipe section and between the rapid discharging and disassembling device and the straight pipe section.
It is further preferred that the bend section of the transfer line is provided with fluidization enhancing means.
Further preferably, the fluidization enhancing means is an aeration tube, an air trough or a gasification plate.
Preferably, the transport system comprises a belt conveyor, on which an electronic belt scale is provided.
Preferably, a dust removal and dust fall system is arranged in the electrolytic aluminum waste multistage crushing system.
Preferably, a flue gas pipe of the circulating fluidized bed boiler is connected with a hydrogen fluoride detection and removal system.
Preferably, the multistage crushing system of electrolytic aluminum waste material, the pneumatic conveying system and the transmission system are all provided with a quick cut-off device.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model discloses a circulating fluidized bed boiler mixes burns electrolytic aluminum waste material processing system useless admittedly, electrolytic aluminum waste material and limestone flour after the breakage send to mixing system mixing back through pneumatic conveying system respectively, send into circulating fluidized bed boiler through transmission system and mix and burn. The system can be constructed according to the existing equipment, and the equipment arrangement is flexible; the pneumatic conveying system is adopted for conveying materials, the conveying capacity is large, the speed is high, and long-distance continuous conveying can be realized. The circulating fluidized bed boiler has wide fuel adaptability and Nitric Oxide (NO)X) Low discharge, easy realization of ash utilization and the like, can realize large-scale engineering utilization of industrial solid wastes, and utilizes the in-furnace desulfurization system of the power plantThe system, the dust removal system, the mercury removal system and the denitration system not only realize the comprehensive utilization of industrial solid waste, recycle the heat value of the solid waste and reduce the pollution of the toxic industrial solid waste to water resources and land resources, but also ensure the dust and SO generated in the blending combustion process2、NOXThe emission meets the national environmental protection standard, and CN-cyanide ions in the electrolytic aluminum waste can be effectively removed by co-combustion with fire coal, so that the electrolytic aluminum waste is combusted into carbon dioxide and nitrogen. The method has the advantages that the circulating fluidized bed boiler is adopted to carry out mixed combustion/combustion utilization on the electrolytic aluminum waste materials, so that the fuel cost can be saved, the economic benefit is realized, the in-furnace desulfurization system of the circulating fluidized bed boiler can generate calcium fluoride with fluoacid radicals contained in the electrolytic aluminum waste materials, toxic cyanate radicals generate carbon dioxide and nitrogen through high-temperature combustion (850-900 ℃), the electrolytic aluminum waste materials are subjected to harmless treatment through mixed combustion, the pollution of toxic solid waste to land and water resources can be reduced, and meanwhile, the huge social benefit and economic benefit are realized.
Further, the electrolytic aluminum waste material multistage crushing system achieves proper particle size through air hammer crushing and two-stage jaw crusher crushing treatment, and is convenient to transmit and perform subsequent mixing and blending combustion treatment.
Furthermore, the pneumatic conveying system of each material line comprises two pipelines, a valve is arranged between the two pipelines, and the pneumatic conveying system can be switched between one pipeline and the other pipeline in emergency when the pneumatic conveying system operates for standby in normal operation, so that the safety and the reliability of the pneumatic conveying system are improved. And a plurality of slag discharging ports are arranged, so that the daily maintenance is convenient.
Furthermore, the joint of the elbow section and the straight pipe section of the conveying pipeline adopts a quick discharging and disassembling device, so that the elbow can be conveniently treated and maintained; the seal gasket can improve the gas tightness of the pipeline.
Furthermore, because the local resistance of the elbow is large, the speed of fluidized particles at the elbow is reduced, the energy is reduced, and the blockage is easily caused.
Furthermore, the transmission system adopts a belt transmission device, so that the device is convenient and flexible and has low cost; be equipped with electronic belt conveyor scale on the area conveyer, can weigh when material transmission, the continuity is good, is convenient for adjust the volume that gets into follow-up mixing system, and degree of automation is high.
Furthermore, a dedusting and dust-settling system is arranged in the multistage crushing system of the electrolytic aluminum waste, so that the working condition can be improved, and the pollution to the surrounding environment is reduced.
Furthermore, a flue gas pipe of the circulating fluidized bed boiler is connected with a hydrogen fluoride detection and removal system, the hydrogen fluoride content generated by feedback co-combustion can be monitored and removed, meanwhile, the raw material consumption and process parameters of the previous working procedure are adjusted, the reaction conditions are improved, and the electrolytic aluminum waste material is completely reacted.
Furthermore, quick cut-off devices are arranged in the multistage crushing system of the electrolytic aluminum waste materials, the pneumatic conveying system and the transmission system, so that the system can be stopped suddenly in emergency, and the safety of the system is improved.
Drawings
FIG. 1 is a schematic view of the overall structure of a circulating fluidized bed boiler co-combustion electrolytic aluminum waste solid waste treatment system of the present invention;
FIG. 2 is a schematic structural view of a pipe bending section in the pneumatic conveying system of the present invention;
fig. 3 is a schematic structural view of the pneumatic conveying system of the present invention.
In the figure: 1-electrolytic aluminum waste material multistage crushing system, 2-limestone powder feeding device, 3-pneumatic conveying system, 3-1 pneumatic conveying pump, 3-2 conveying pipeline, 3-3 connecting branch pipe, 3-4 valve, 3-5 quick discharging and disassembling device, 3-6 sealing gasket, 4-mixing system, 5-transmission system, 6-circulating fluidized bed boiler, 7-dust removing and settling system, and 8-hydrogen fluoride detecting and removing system.
Detailed Description
The invention will be described in further detail with reference to the following drawings and specific examples, which are intended to illustrate and not to limit the invention:
fig. 1 is a solid waste treatment system for mixed combustion of electrolytic aluminum waste in a circulating fluidized bed boiler, which comprises an electrolytic aluminum waste multistage crushing system 1, a limestone powder feeding device 2, a pneumatic conveying system 3, a mixing system 4, a conveying system 5 and a circulating fluidized bed boiler 6; electrolytic aluminum waste material multistage crushing system 1 and limestone powder feed arrangement 2 are connected to mixing system 4 through pneumatic conveying system 3 respectively, and mixing system 4 passes through transmission system 5 and is connected with circulating fluidized bed boiler 6's coal feeding belt, finally gets into the furnace feed inlet, and the furnace feed inlet can be for coal feeding mouth, returning charge ware riser, secondary air port or new opening.
Multistage broken system 1 of electrolytic aluminum waste material includes tertiary breakage, and the one-level breakage is air hammer breaker, and second grade and tertiary breakage are jaw breaker, and the broken biggest broken particle diameter of tertiary is less than the second grade breakage, and electrolytic aluminum waste material is broken to the target particle diameter step by step. And the transmission is carried out between each stage through a multi-stage belt.
Preferably, a dust removal and dust fall system 7 is arranged in the electrolytic aluminum waste multistage crushing system 1.
The transmission system 5 preferably adopts a belt conveying device, an electronic belt scale is arranged on the belt conveying device, and the electronic belt scale can be a single-speed belt scale or a variable-speed belt scale and is selected according to actual requirements.
Referring to fig. 3, in a preferred embodiment of the present invention, the pneumatic conveying system 3 comprises a pneumatic conveying pump 3-1 and a conveying pipeline 3-2, the conveying pipeline 3-2 is provided with a plurality of slag-tap holes, and the air flow of the pneumatic conveying pump 3-1 is adjustable to satisfy the blending combustion ratio of different working conditions; two conveying pipelines 3-2 are arranged between the electrolytic aluminum waste multistage crushing system 1 and the blending system 4, each conveying pipeline 3-2 is independently connected with a pneumatic conveying pump 3-1, a connecting branch pipe 3-3 is arranged between the two conveying pipelines 3-2, and a valve 3-4 is arranged on the connecting branch pipe 3-3; two conveying pipelines 3-2 are arranged between the limestone feeding device 2 and the blending system 4, each conveying pipeline 3-2 is independently connected with a pneumatic conveying pump 3-1, a connecting branch pipe 3-3 is arranged between the two conveying pipelines 3-2, and a valve 3-4 is arranged on the connecting branch pipe 3-3.
As shown in figure 2, the bent pipe section and the straight pipe section of the conveying pipeline 3-2 are connected through a quick discharging and disassembling device 3-5, and sealing gaskets 3-6 are arranged between the quick discharging and disassembling device 3-5 and the bent pipe section and the straight pipe section. Preferably, the bend of the transfer line 3-2 is provided with fluidization enhancing means, such as an air-filled tube, an air trough or a gasification plate, in order to supplement air to the bend, improve the fluidization of the material, avoid clogging and increase the transfer speed.
Preferably, a hydrogen fluoride detection and removal system 8 is arranged behind a flue gas pipe of the circulating fluidized bed boiler 6 and used for monitoring the content of hydrogen fluoride in the flue gas in real time and removing the hydrogen fluoride through a chemical cleaning device.
All be equipped with quick cutting device in electrolytic aluminum waste material multistage broken system 1, pneumatic conveying system 3 and the transmission system 5, if: the multistage crushing system 1 of electrolytic aluminum waste material and the transmission system 5 are provided with a quick cut-off electric brake, and the pneumatic transmission system 3 is provided with a quick cut-off valve to deal with emergency.
The circulating fluidized bed boiler co-combustion electrolytic aluminum waste solid waste treatment system is in operation:
electrolytic aluminum waste materials are crushed by the electrolytic aluminum waste material multistage crushing system 1 and then enter the mixing system 4 through the pneumatic conveying system 3, limestone powder in the limestone powder feeding device 2 enters the mixing system 4 through the pneumatic conveying system 3, the limestone powder and the limestone powder are mixed by the mixing system 4 and then are conveyed to the coal feeding belt through the conveying system 5, and the coal feeding belt and boiler coal feeding enter the circulating fluidized bed boiler 6 together for mixing and burning, so that the treatment of solid waste of the electrolytic aluminum waste materials is completed. The method has the advantages of simple operation, high automation degree, easy centralized control, low raw material processing requirement, large treatment capacity and long conveying distance, can reduce the pollution of toxic solid waste to land and water resources, and can recycle the solid waste heat.
It should be noted that the above description is only one of the embodiments of the present invention, and all equivalent changes made by the system described in the present invention are included in the protection scope of the present invention. The technical field of the present invention can be replaced by other embodiments described in a similar manner, without departing from the structure of the present invention or exceeding the scope defined by the claims, which belong to the protection scope of the present invention.
Claims (10)
1. A solid waste treatment system for mixed combustion of electrolytic aluminum waste in a circulating fluidized bed boiler is characterized by comprising an electrolytic aluminum waste multistage crushing system (1), a limestone powder feeding device (2), a pneumatic conveying system (3), a mixing system (4), a conveying system (5) and a circulating fluidized bed boiler (6);
the electrolytic aluminum waste material multistage crushing system (1) and the limestone powder feeding device (2) are respectively connected to the blending system (4) through the pneumatic conveying system (3), and the blending system (4) is connected with a coal feeding belt of the circulating fluidized bed boiler (6) through the transmission system (5).
2. The circulating fluidized bed boiler co-combustion electrolytic aluminum waste solid waste treatment system according to claim 1, wherein the electrolytic aluminum waste multistage crushing system (1) comprises three stages of crushing, and the stages of crushing are connected through a conveying belt; the first-stage crushing is an air hammer crushing device, the second-stage crushing and the third-stage crushing are jaw crushers, and the maximum crushing grain size of the third-stage crushing is smaller than that of the second-stage crushing.
3. The system for treating solid waste of blended electrolytic aluminum waste materials in a circulating fluidized bed boiler according to claim 1, wherein the pneumatic conveying system (3) comprises a pneumatic conveying pump (3-1) and a conveying pipeline (3-2), and a plurality of slag discharging ports are arranged on the conveying pipeline (3-2); two conveying pipelines (3-2) are arranged between the electrolytic aluminum waste material multistage crushing system (1) and the blending system (4), each conveying pipeline (3-2) is independently connected with a pneumatic conveying pump (3-1), a connecting branch pipe (3-3) is arranged between the two conveying pipelines (3-2), and a valve (3-4) is arranged on the connecting branch pipe (3-3); the number of the conveying pipelines (3-2) between the limestone powder feeding device (2) and the blending system (4) is two, each conveying pipeline (3-2) is independently connected with a pneumatic conveying pump (3-1), a connecting branch pipe (3-3) is arranged between the two conveying pipelines (3-2), and a valve (3-4) is arranged on the connecting branch pipe (3-3).
4. The system for treating solid waste of mixed-combustion electrolytic aluminum waste materials in a circulating fluidized bed boiler according to claim 3, wherein the bent pipe section and the straight pipe section of the conveying pipeline (3-2) are connected through a rapid discharging and disassembling device (3-5), and sealing gaskets (3-6) are arranged between the rapid discharging and disassembling device (3-5) and the bent pipe section and the straight pipe section.
5. The system for treating solid waste of blended electrolytic aluminum waste materials in a circulating fluidized bed boiler according to claim 3, wherein the elbow section of the conveying pipeline (3-2) is provided with a fluidization enhancing device.
6. The system of claim 5, wherein the fluidization enhancing device is a gas-filled tube, an air tank or a gasification plate.
7. The system for treating solid waste of blended electrolytic aluminum waste of circulating fluidized bed boiler according to claim 1, wherein the conveying system (5) comprises a belt conveyer, and an electronic belt scale is arranged on the belt conveyer.
8. The solid waste treatment system for the blended combustion of the electrolytic aluminum waste in the circulating fluidized bed boiler as claimed in claim 1, wherein a dedusting and dustfall system (7) is arranged in the multistage crushing system (1) for the electrolytic aluminum waste.
9. The system for processing the solid waste of the blended electrolytic aluminum waste of the circulating fluidized bed boiler according to claim 1, wherein a flue gas pipe of the circulating fluidized bed boiler (6) is connected with a hydrogen fluoride detecting and removing system (8).
10. The system for treating solid waste of blended electrolytic aluminum waste materials in a circulating fluidized bed boiler according to claim 1, wherein the multistage crushing system (1) for electrolytic aluminum waste materials, the pneumatic conveying system (3) and the conveying system (5) are respectively provided with a quick cut-off device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922284104.0U CN211345342U (en) | 2019-12-18 | 2019-12-18 | Circulating fluidized bed boiler mixes burns electrolytic aluminum waste material and gives up processing system admittedly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922284104.0U CN211345342U (en) | 2019-12-18 | 2019-12-18 | Circulating fluidized bed boiler mixes burns electrolytic aluminum waste material and gives up processing system admittedly |
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| CN211345342U true CN211345342U (en) | 2020-08-25 |
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| CN201922284104.0U Active CN211345342U (en) | 2019-12-18 | 2019-12-18 | Circulating fluidized bed boiler mixes burns electrolytic aluminum waste material and gives up processing system admittedly |
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