CN214142482U - Segmentation cooling system of high-temperature powdery iron ore reduction calcine - Google Patents
Segmentation cooling system of high-temperature powdery iron ore reduction calcine Download PDFInfo
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- CN214142482U CN214142482U CN202022166598.5U CN202022166598U CN214142482U CN 214142482 U CN214142482 U CN 214142482U CN 202022166598 U CN202022166598 U CN 202022166598U CN 214142482 U CN214142482 U CN 214142482U
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Abstract
The utility model discloses a high temperature powdery iron ore reduction calcine segmentation cooling system, which comprises a reduction furnace, a first material seal valve, a waste heat boiler, a second material seal valve, an aerobic cooler, a cyclone separator, a slurry making groove and a slurry pump, wherein a plurality of boiler cluster pipes are arranged inside a vertical bed and a horizontal fluidized bed of the waste heat boiler to form a heat exchange unit, the high temperature powdery iron ore reduction calcine segmentation cooling system provided by the utility model replaces the traditional water cooling mode, adopts different gas media to carry out fluidization cooling in a plurality of sections, the latent heat of ore is fully utilized, the high temperature section adopts protective gases such as coal gas and nitrogen gas to form an anaerobic environment, the iron ore which is not fully reduced can be prevented from generating iron ore with weak magnetism through 'peroxidation', the iron ore which is not fully reduced can continue to react in the reducing atmosphere, the magnetic conversion rate of the iron ore can be improved, and the coal gas and the air are all preheated, and the mixed combustion is carried out in the main combustion chamber, so that the heat consumption of the roasting system can be reduced.
Description
Technical Field
The utility model relates to a metallurgy and mineral processing engineering field, concretely relates to likepowder iron ore deposit reduction calcine segmentation cooling system of high temperature, this cooling system can carry out waste heat recovery when "keeping magnetism cooling" with likepowder iron ore deposit reduction calcine of high temperature.
Background
China has rich complex refractory iron oxide ore resources, the mineral composition of the ore is complex, the magnetism is weak, the embedded particle size is fine, ideal separation indexes are difficult to obtain by a conventional strong magnetic separation process, and good separation indexes can be often obtained by performing processes such as magnetic separation, reverse flotation and the like on the ore after reduction magnetization roasting pretreatment.
The traditional magnetizing roasting process comprises a saddletree shaft furnace magnetizing roasting process, a rotary kiln magnetizing roasting process and the like, wherein reduction calcine is generally adopted in a cooling mode to directly enter water, so that 'anaerobic cooling' is realized, the mode has the advantages of realizing rapid cooling under the condition of isolating air in high-temperature reduction roasting, avoiding the risk of reoxidation caused by contact between the reduction calcine and air, and having the defects that the waste heat of ores cannot be recycled, and a large amount of steam and dust are generated during water cooling, so that certain environmental pollution is caused.
In recent years, with the development of a magnetic roasting technology, iron ore is made into powder, and a fluidized roasting method is gradually applied, wherein the fluidized magnetic roasting technology has the characteristics of low energy consumption, large treatment capacity, small floor area, high waste heat utilization rate, capability of treating powder ore and the like, but the technology of a powdery high-temperature material waste heat recovery system is immature, the risk of generating weak magnetic hematite by a peroxidation reaction when reduction roasted sand is in contact with air at high temperature is existed, the quality of roasted ore concentrate is seriously influenced, and on the contrary, if the fluidized roasted sand is directly cooled by water, the waste heat of the ore cannot be recovered, the roasting cost can be greatly increased, and the overall benefit of the powder ore roasting process is influenced.
Therefore, if the waste heat of the ore is to be recovered, the reduction calcine is firstly ensured to avoid direct contact with air under the high-temperature condition, the ore is cooled to the temperature below the oxidation temperature point (the iron minerals are generally 350-400 ℃) in the protective atmosphere, the waste heat is exchanged to other media, and then water-cooling pulping is carried out.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: to above prior art the likepowder reduction calcine of high temperature have reoxidation characteristic, a series of technical problem that the waste heat is difficult to recycle, the utility model discloses a likepowder iron ore reduction calcine of high temperature segmentation cooling system, this cooling system replace traditional water-cooling mode, adopt different gaseous medium to divide the multistage to carry out fluidization cooling, and the ore latent heat utilizes fully, and the high temperature section adopts protective gas such as coal gas and nitrogen gas to form the anaerobic environment, can prevent that iron mineral from taking place "peroxidation" reaction and generating weak magnetic iron mineral.
The utility model adopts the technical scheme as follows:
a high-temperature powdery iron ore reduction calcine segmented cooling system is sequentially provided with a reduction furnace, a first material seal valve, a waste heat boiler, a second material seal valve, an aerobic cooler, a cyclone separator, a slurry making tank and a slurry pump, wherein a gas pipe network is arranged below the reduction furnace, gas is introduced into the reduction furnace through the gas pipe network, a first cyclone dust collector is further arranged above the reduction furnace, and surplus gas in the reduction furnace enters a main combustion chamber of a roasting furnace after being dedusted by the first cyclone dust collector at the top.
The reducing furnace is communicated with the first material sealing valve, the powdery iron oxide ore enters the first material sealing valve after being magnetized and roasted by the reducing furnace, a nitrogen pipe network is arranged below the first material sealing valve, nitrogen is introduced into the first material sealing valve through the nitrogen pipe network, and the material is conveyed into the waste heat boiler from the first material sealing valve under the fluidization effect of the nitrogen.
Further, the waste heat boiler is of an L-shaped structure and is divided into two parts, one part is a vertical bed of the waste heat boiler, and the vertical bed of the waste heat boiler is sequentially divided into an evaporator I, a high-temperature superheater, a low-temperature superheater and an evaporator II from top to bottom; the other part is a horizontal bed of the waste heat boiler, a plurality of groups of partition walls which are vertically staggered and formed by boiler bundling pipes are vertically arranged in the horizontal bed of the waste heat boiler, a evaporator III, a medium-pressure economizer I, a medium-pressure economizer II and a low-pressure economizer chamber are sequentially arranged in the horizontal direction of the horizontal bed of the waste heat boiler, a gas pipe network and a nitrogen pipe network are respectively arranged below the waste heat boiler, gas and nitrogen with certain pressure enter the boiler box body from a bottom air chamber of the waste heat boiler through a hood through the gas pipe network and the nitrogen pipe network, two gas air chambers are arranged at the bottom of the front end of the waste heat boiler, the evaporator III, the medium-pressure economizer I and the medium-pressure economizer II are introduced from the hood, a nitrogen air chamber is arranged at the bottom of the tail end of the waste heat boiler, the low-pressure economizer area is introduced from the hood, materials sequentially pass through the evaporator III, the medium-pressure economizer I and the medium-pressure economizer II and enter the low-pressure economizer area, discharging the high-temperature powder reduction calcine from a discharge hole of a horizontal bed of the waste heat boiler out of the fluidized bed under the action of nitrogen, moving the high-temperature powder reduction calcine forwards at a low speed in a S-shaped track under the action of coal gas and nitrogen, and exchanging heat with the coal gas, the nitrogen, media in a boiler pipeline and the like.
Furthermore, the interior of the waste heat boiler box body is of a fluidized bed structure, the boiler box body is divided into a plurality of cooling chambers by partition walls formed by a plurality of bundling pipes, and mediums such as desalted water, saturated steam or superheated steam are introduced into the pipes to exchange heat with high-temperature powder materials to form steam which can be used for waste heat power generation.
The top parts of the vertical bed and the horizontal bed of the waste heat boiler are provided with a second cyclone dust collector, coal gas and nitrogen gas can enter the second cyclone dust collector from an air pipe, the upper part of the second cyclone dust collector is communicated with a main combustion chamber of the roasting furnace, the coal gas and the nitrogen gas are discharged from the top part of the box body of the boiler, and enter a combustion system to participate in combustion after cyclone dust removal, in the process, hot materials mainly exchange heat with media (water or steam) in the pipe wall, and the coal gas and the nitrogen gas only take away a small amount of heat, so that the waste heat boiler mainly plays a role in fluidization, and ensures a reducing environment (oxygen-free environment) and isolates different air sources.
The waste heat boiler discharge gate feeds through with second material seal valve, and the temperature of material reduces to and gets into second material seal valve from discharging in the waste heat boiler box when below "peroxidation temperature", second material seal valve below is provided with the nitrogen gas pipe network, and second material seal valve bottom is equipped with the nitrogen gas plenum, and the material after the cooling is discharged from the low pressure economizer room bin outlet of waste heat boiler horizontal bed and is got into second material seal valve, and the material gets into second material seal valve and can form the material of 1m height and seal, second material seal valve mainly plays the effect that waste heat boiler box and aerobic cooler keep apart, prevents different air supplies from getting into the bad news.
And the outlet of the second material sealing valve is communicated with the inlet of the aerobic cooler, and the cooled material is uniformly fed into the aerobic cooler for air cooling under the action of nitrogen at the bottom of the second material sealing valve.
The aerobic cooler is internally of a cavity structure, the bottom of the aerobic cooler is communicated with the atmosphere, an auxiliary fluidized bed and a centrifugal pressurizing fan are sequentially arranged below the aerobic cooler, air is sucked from the bottom of the aerobic cooler through the centrifugal pressurizing fan and the auxiliary fluidized bed, and is mixed with the material discharged from the second material sealing valve and then moves upwards in the aerobic cooler, the air sucked in the aerobic cooler is fully contacted with the cooled calcine material, the calcine is further cooled, partial iron minerals are subjected to micro-oxidation reaction to generate strong-magnetic gamma-Fe 2O3, and a large amount of reaction heat is discharged at the same time.
The top of the aerobic cooler is communicated with an inlet of a cyclone separator, materials are fully contacted with air under certain negative pressure and enter the cyclone separator along the tangential direction, the cyclone separator is of a cyclone cylinder structure, gas-solid separation is realized under the action of centrifugal force, the top of the cyclone separator is communicated with a main combustion chamber of a roasting furnace, air is preheated and heated in the process and enters a combustion chamber for combustion through the negative pressure at the top of the cyclone separator, and the materials are discharged from the bottom of the cyclone separator when being further cooled to below a certain temperature.
The bottom bin outlet of cyclone communicates with slurry making tank upper portion, and the material after the cooling is arranged to making the slurry tank by cyclone's bottom bin outlet and is carried out the water-cooling slurrying, it is equipped with on slurry making tank upper portion and replenishes water pipeling and dust removal pipeline to make slurry tank, and when the material got into slurry making tank, the outside was replenished water and is realized the water-cooling and make the slurry of certain concentration, it is linked together with the sediment stuff pump to make the slurry tank, is sent into follow-up selection by the sediment stuff pump.
A sectional cooling system for high-temperature powdery iron ore reduction calcine comprises the following specific technological processes: after being magnetized and roasted by a reducing furnace, powdery iron oxide ore with the granularity of-0.074 mu m accounting for 50-70 percent is at the temperature of about 500-600 ℃, fed into a feeding port at the top of a vertical bed of a waste heat boiler through a first material sealing valve under the fluidization action of nitrogen, enters a box body of the waste heat boiler, is dedusted by a first cyclone dust collector at the top, enters a main combustion chamber of the roasting furnace for mixing combustion, is subjected to protective cooling inside the box body of the waste heat boiler, passes through a gas cooling section and a nitrogen cooling section in sequence, passes through an evaporator I, a high-temperature superheater, a low-temperature superheater and an evaporator II in the vertical moving bed in sequence under the action of gravity, exchanges heat with a medium in a boiler pipeline, can produce low-pressure steam (240 ℃ and 1.8MPa) of 28t/h, is sent into a steam generator set for power generation, and simultaneously the temperature of the calcine is reduced to about 350 ℃, after the reduction calcine enters a horizontal bed of the waste heat boiler, the reduction calcine slowly moves to a discharge end at a speed of 0.1m/s-0.2m/s under the action of mixed gas at the bottom (the high, coke and converter gas are mixed in different proportions), the reduction calcine sequentially passes through an evaporator III, a medium-pressure economizer I and a medium-pressure economizer II, enters a low-pressure economizer area, and is discharged out of the horizontal bed of the waste heat boiler from a discharge port under the action of nitrogen, the calcine temperature is further reduced to about 300 ℃, in the process, heat exchange is mainly carried out on thermal materials and media (water or steam) in a pipe wall, the gas and the nitrogen only take away a small amount of heat, the fluidization effect is mainly achieved, the reduction environment (oxygen-free environment) and the effects of isolating different gas sources are ensured, the gas and the nitrogen can enter a second cyclone dust collector from an air pipe, enter a combustion system for combustion after cyclone dust collection, the cooled materials are discharged from a discharge port of a low-pressure economizer chamber of the horizontal bed of the waste heat boiler and enter a second material sealing valve, under the action of nitrogen gas at the bottom of the material sealing valve, the material enters an aerobic cooler, air is sucked from the bottom of the aerobic cooler under the negative pressure condition of-500 Pa to 1000Pa, and the air is mixed with the material discharged by the second material sealing valve and moves upwards, feeding cyclone separator along tangential direction at the top of aerobic cooler for gas-solid separation, feeding air into main combustion chamber from the top of separator for combustion supporting, discharging cooled material from the bottom discharge outlet of cyclone separator to slurry making tank for water-cooling pulping, wherein in the air cooling process, the ore temperature is further reduced to below 250 ℃, and simultaneously carrying out micro-oxidation reaction to generate strong magnetic gamma-Fe 2O3, releasing a certain amount of reaction heat, preheating air, then entering a combustion chamber for combustion supporting, supplementing water to a slurry making groove, reducing calcine at low temperature to form ore pulp with a certain concentration, and conveying the ore pulp to subsequent weak magnetic separation by a slurry pump.
Therefore, after the materials are subjected to protective cooling, aerobic cooling and water-cooling pulping, most of waste heat is exchanged into desalted water to form steam for power generation, the whole cooling and waste heat recovery process is completed, coal gas and combustion air are preheated, and the waste heat utilization efficiency is improved; and part of iron minerals are subjected to micro-oxidation reaction to generate strong magnetic gamma-Fe 2O3, so that subsequent sorting and tailing discarding are facilitated, the index of the concentrate is improved, part of reaction heat is released, and the reduction of the energy consumption of the system is facilitated.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the traditional water cooling mode is replaced, different gas media are adopted to carry out fluidized cooling in multiple sections, and the latent heat of the ore is fully utilized; the high-temperature section adopts protective gases such as coal gas, nitrogen and the like to form an oxygen-free environment, so that the iron minerals can be prevented from generating peroxidation reaction to generate weak magnetic iron minerals; the iron minerals which are not fully reduced can continue to react in the reducing atmosphere, so that the magnetic conversion rate of the iron minerals can be improved; the coal gas and the air are preheated and enter the main combustion chamber for co-combustion, so that the heat consumption of a roasting system can be reduced;
(2) under the condition of low temperature, the reduced calcine can be contacted with air to generate micro-oxidation reaction to generate strong magnetic gamma-Fe 2O3, and the coercive force and the magnetic agglomeration phenomenon of the reduced calcine are smaller than those of the conventional water-cooled magnetite, so that the subsequent sorting is facilitated; the heat released by the micro-oxidation reaction can be fully utilized, and the heat consumption of roasting is reduced.
Drawings
FIG. 1 is a flow chart of the sectional cooling system for reducing calcine of high-temperature powdered iron ore of the present invention;
labeled as: 1-a reduction furnace, 2-a first cyclone dust collector, 3-a vertical bed of a waste heat boiler, 4-a horizontal bed of the waste heat boiler, 5-a first material sealing valve, 6-a second cyclone dust collector, 7-an aerobic cooler, 8-a cyclone separator, 9-a combustion chamber of a roasting furnace, 10-a slurry making tank, 11-a slurry pump, 12-an auxiliary fluidized bed, 13-a cold air inlet, 14-a centrifugal pressurizing fan, 15-a gas pipe network, 16-a nitrogen pipe network and 17-a second material sealing valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention.
As shown in fig. 1, the cooling system for the high-temperature powdered iron ore reduction calcine is sequentially provided with a reduction furnace 1, a first material sealing valve 5, a waste heat boiler, a second material sealing valve 17, an aerobic cooler 7, a cyclone separator 8, a slurry making tank 10 and a slurry pump 11, wherein a gas pipe network 15 is arranged below the reduction furnace 1, gas is introduced into the reduction furnace 1 through the gas pipe network 15, a first cyclone dust collector 2 is further arranged above the reduction furnace 1, and surplus gas in the reduction furnace 1 enters a main combustion chamber 9 of the roasting furnace after being dedusted by the first cyclone dust collector 2 at the top to be mixed and burned.
The reduction furnace 1 is communicated with a first material sealing valve 5, the powdery iron oxide ore enters the first material sealing valve 5 after being magnetized and roasted by the reduction furnace 1, a nitrogen pipe network 16 is arranged below the first material sealing valve 5, nitrogen is introduced into the first material sealing valve 5 through the nitrogen pipe network 16, and feeding is carried out through a feeding port at the top of the waste heat boiler by the first material sealing valve 5 under the fluidization effect of the nitrogen.
The waste heat boiler is of an L-shaped structure and is divided into two parts, wherein one part is a vertical bed 3 of the waste heat boiler and is sequentially divided into an evaporator I, a high-temperature superheater, a low-temperature superheater and an evaporator II from top to bottom; one part is a horizontal bed 4 of the waste heat boiler, a plurality of groups of partition walls which are vertically staggered and composed of boiler bundling pipes are vertically arranged in the horizontal bed 4, the partition walls are sequentially divided into an evaporator III, a medium-pressure economizer I, a medium-pressure economizer II and a low-pressure economizer chamber in the horizontal direction, a gas pipe network 15 and a nitrogen pipe network 16 are respectively arranged below the waste heat boiler, two gas air chambers are arranged at the bottom of the front end of the waste heat boiler and are introduced into the evaporator III, the medium-pressure economizer I and the medium-pressure economizer chamber through a hood, a nitrogen air chamber is arranged at the bottom of the tail end of the waste heat boiler and is introduced into the low-pressure economizer area through the hood, the gas and the nitrogen sequentially pass through the evaporator III, the medium-pressure economizer I and the medium-pressure economizer II and enter the low-pressure economizer area, then are discharged out of a fluidized bed from a discharge port of the horizontal bed 4 of the waste heat boiler under the action of nitrogen, the gas and the nitrogen at certain pressure enter the inner part of a boiler box body through the hood through the gas pipe network 15 and the nitrogen pipe network 16, and high-temperature powdery reduction calcine under the action of the gas and the nitrogen, moves forwards at low speed in S-shaped track and exchanges heat with coal gas, nitrogen gas, medium in boiler pipeline, etc.
The interior of the waste heat boiler box body is of a fluidized bed structure, the boiler box body is divided into a plurality of cooling chambers by partition walls formed by a plurality of bundling pipes, and media such as desalted water, saturated steam or superheated steam are introduced into the pipes to exchange heat with high-temperature powder materials to form steam which can be used for waste heat power generation.
The top of the waste heat boiler vertical bed 3 and the top of the waste heat boiler horizontal bed 4 are provided with a second cyclone dust collector 6, coal gas and nitrogen can enter the second cyclone dust collector 6 from an air pipe, the upper part of the second cyclone dust collector 6 is communicated with a roasting furnace main combustion chamber 9, the coal gas and the nitrogen are discharged from the top of a boiler box body and enter a combustion system to participate in combustion after cyclone dust removal, in the process, thermal-state materials mainly exchange heat with media (water or steam) in the pipe wall, and only a small amount of heat is taken away by the coal gas and the nitrogen, so that the fluidized effect is mainly achieved, the reduction environment (oxygen-free environment) is ensured, and different air sources are isolated.
The discharge hole of the waste heat boiler is communicated with a second material sealing valve 17, when the temperature of the material is reduced to be below the peroxidation temperature, the material is discharged from the box body of the waste heat boiler and enters the second material sealing valve 17, a nitrogen pipe network 16 is arranged below the second material sealing valve 17, a nitrogen chamber is arranged at the bottom of the second material sealing valve 17, the cooled material is discharged from the discharge hole of the low-pressure economizer chamber of the horizontal bed 4 of the waste heat boiler and enters the second material sealing valve 17, the material enters the second material sealing valve 17 to form a material seal with the height of 1m, and the second material sealing valve 17 mainly plays a role in isolating the box body of the waste heat boiler from the aerobic cooler 7 and prevents different gas sources from gas leakage.
The outlet of the second material sealing valve 17 is communicated with the inlet of the aerobic cooler 7, the cooled material is uniformly fed into the aerobic cooler 7 for air cooling under the action of nitrogen at the bottom of the second material sealing valve 17, the aerobic cooler 7 is internally provided with a cavity structure, the bottom of the aerobic cooler is communicated with the atmosphere, an auxiliary fluidized bed 12 and a centrifugal pressure fan 14 are sequentially arranged below the aerobic cooler 7, the material enters the aerobic cooler 7, the formed negative pressure sucks air into the aerobic cooler 7 to fully contact with the cooled calcine, the calcine is further cooled, partial iron minerals are subjected to micro-oxidation reaction to generate strong-magnetic gamma-Fe 2O3, and a large amount of reaction heat is discharged simultaneously.
Fully contacts with air under certain negative pressure and enters a cyclone separator 8 along the tangential direction, the top of an aerobic cooler 7 is communicated with an inlet of the cyclone separator 8, the cyclone separator is of a cyclone cylinder structure and is communicated with the upper part of the aerobic cooler 7, the preheated air and calcine are fed into the cyclone separator 8 along the tangential direction from the upper part of the aerobic cooler 7, gas-solid separation is realized under the action of centrifugal force, the top of the cyclone separator 8 is communicated with a roasting furnace main combustion chamber 9, the air is preheated and heated in the process and enters a combustion chamber 9 from the top of the cyclone separator 8 under the negative pressure, materials are discharged from the bottom of the cyclone separator 8 when being further cooled to a certain temperature, the upper part of a pulp making groove 10 is communicated with a bottom discharge port of the cyclone separator 8, a replenishing water pipeline and a dust removal pipeline are arranged on the upper part of the pulp making groove 10, and external replenishing water realizes water cooling and makes slurry with a certain concentration when the materials enter the pulp making groove 10, the slurry making groove 10 is communicated with a slurry pump 11 and is sent to subsequent separation by the slurry pump 11.
Air is sucked from the bottom of the aerobic cooler 7 through the centrifugal booster fan 14 and the auxiliary fluidized bed 12, and is mixed with materials discharged from the material sealing valve 17 and then moves upwards in the aerobic cooler 7, the air is fed into the cyclone separator 8 along the tangential direction at the top of the aerobic cooler 7 for gas-solid separation, the air enters the main combustion chamber 9 from the top of the cyclone separator 8 for combustion supporting, the cooled materials are discharged to the slurry making tank 10 from the lower part of the cone body of the cyclone separator 8 for water-cooling pulping, the slurry making tank 10 is supplemented with water and low-temperature reduction calcine to form ore pulp with the concentration of about 30 percent, and the ore pulp is conveyed to subsequent weak magnetic separation by the slurry pump 11.
A sectional cooling system for high-temperature powdery iron ore reduction calcine is described as follows: after 50% -70% of powdery iron oxide ore with the granularity of-0.074 mu m is magnetized and roasted by a reduction furnace 1, the temperature is about 500 ℃ -600 ℃, the powdery iron oxide ore is fed into a feeding port at the top of a vertical bed 3 of a waste heat boiler through a first material seal valve 5 under the fluidization action of nitrogen, the material enters the box body of the waste heat boiler, the excessive coal gas in the reduction furnace is dedusted by a first cyclone dust collector 2 at the top and then enters a main combustion chamber 9 of the roasting furnace for blending combustion, the material is protected and cooled in the box body of the waste heat boiler and passes through a coal gas cooling section and a nitrogen cooling section in sequence, the high-temperature reduction roasted sand passes through an evaporator I, a high-temperature superheater, a low-temperature superheater and an evaporator II in the vertical moving bed in sequence under the action of gravity and exchanges heat with a medium in a boiler pipeline, and can produce 28t/h low-pressure steam (240 ℃, 1.8MPa) and then is sent into a steam generator set for power generation, meanwhile, the temperature of the roasted product is reduced to about 350 ℃, the reduced roasted product enters a horizontal bed 4 of the waste heat boiler, then slowly moves to a discharge end at the speed of 0.1-0.2 m/s under the action of mixed gas at the bottom (the coal gas of high, coke and converter is mixed in different proportions), sequentially passes through an evaporator III, a medium-pressure economizer I and a medium-pressure economizer II, enters a low-pressure economizer area, then is discharged out of the horizontal bed 4 of the waste heat boiler from a discharge port under the action of nitrogen, the temperature of the roasted product is further reduced to about 300 ℃, in the process, heat-state materials mainly exchange heat with media (water or steam) in a pipe wall, the coal gas and the nitrogen only take away a small amount of heat, the coal gas and the nitrogen mainly play roles of fluidizing, ensuring a reducing environment (an oxygen-free environment) and isolating different gas sources, the coal gas and the nitrogen can enter a second cyclone dust collector 6 from an air pipe, and enter a combustion system for combustion after dust removal, the cooled material is discharged from a discharge port of a low-pressure economizer chamber of a horizontal bed 4 of the waste heat boiler and enters a second material sealing valve 17, under the action of nitrogen at the bottom of the material sealing valve, the material enters an aerobic cooler 7, air is sucked from the bottom of the aerobic cooler 7 and moves upwards after being mixed with the material discharged by the second material sealing valve 17, the material is fed into a cyclone separator 8 at the top of the aerobic cooler 7 along the tangential direction for gas-solid separation, the air enters a main combustion chamber 9 from the top of the separator for combustion supporting, the cooled material is discharged from the lower part of the cyclone separator 8 to a slurry making tank 10 for water-cooling slurry making, in the process of cooling the air, the temperature of ore is further reduced to below 250 ℃, simultaneously, micro-oxidation reaction is carried out to generate strong-magnetic gamma-Fe 2O3, a certain amount of reaction heat is released, and the air is preheated and then enters a combustion chamber for combustion supporting, the slurry making tank 10 is supplemented with water and low-temperature reduced calcine to form slurry with the concentration of about 30%, and the slurry is conveyed to subsequent weak magnetic separation by a slurry pump 11.
Therefore, after the materials are subjected to protective cooling, aerobic cooling and water-cooling pulping, most of waste heat is exchanged into desalted water to form steam for power generation, the whole cooling and waste heat recovery process is completed, coal gas and combustion air are preheated, and the waste heat utilization efficiency is improved; and part of iron minerals are subjected to micro-oxidation reaction to generate strong magnetic gamma-Fe 2O3, so that subsequent sorting and tailing discarding are facilitated, the index of the concentrate is improved, part of reaction heat is released, and the reduction of the energy consumption of the system is facilitated.
The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.
Claims (10)
1. A sectional cooling system for high-temperature powdery iron ore reduction calcine is characterized in that the cooling system is sequentially provided with a reduction furnace (1), a first material sealing valve (5), a waste heat boiler, a second material sealing valve (17), an aerobic cooler (7), a cyclone separator (8), a slurry making tank (10) and a slurry pump (11), the reduction furnace (1) is communicated with a first material sealing valve (5), the first material sealing valve (5) is communicated with a waste heat boiler, the discharge hole of the waste heat boiler is communicated with a second material sealing valve (17), the outlet of the second material sealing valve (17) is communicated with the inlet of the aerobic cooler (7), the top of the aerobic cooler (7) is communicated with the inlet of the cyclone separator (8), the bottom discharge port of the cyclone separator (8) is communicated with the upper part of the slurry making groove (10), and the slurry making groove (10) is communicated with the slurry pump (11).
2. The sectional cooling system for high-temperature powdered iron ore reduction calcine according to claim 1, wherein the waste heat boiler is of an L-shaped structure and comprises a vertical waste heat boiler bed (3) and a horizontal waste heat boiler bed (4), the vertical waste heat boiler bed (3) is sequentially divided into an evaporator I, a high-temperature superheater, a low-temperature superheater and an evaporator II from top to bottom, and the horizontal waste heat boiler bed (4) is sequentially provided with an evaporator III, a medium-pressure economizer I, a medium-pressure economizer II and a low-pressure economizer chamber in the horizontal direction.
3. The sectional cooling system for the high-temperature powdered iron ore reduction calcine as claimed in claim 2, wherein a gas pipe network (15) and a nitrogen pipe network (16) are respectively arranged below the waste heat boiler, two gas air chambers are arranged at the bottom of the front end of the waste heat boiler, an evaporator III, a medium-pressure economizer I and a medium-pressure economizer II are introduced from a hood, a nitrogen air chamber is arranged at the bottom of the tail end of the waste heat boiler, a low-pressure economizer area is introduced from the hood, a second cyclone dust collector (6) is arranged at the top of the vertical bed (3) of the waste heat boiler and the horizontal bed (4) of the waste heat boiler, and the upper part of the second cyclone dust collector (6) is communicated with the combustion chamber (9).
4. The sectional cooling system for high-temperature powdered iron ore reduction calcine according to claim 3, wherein the interior of the waste heat boiler box body is of a fluidized bed structure, a plurality of groups of partition walls which are vertically staggered and formed by boiler cluster pipes are vertically arranged in the waste heat boiler box body, the boiler box body is divided into a plurality of cooling chambers by the partition walls formed by the cluster pipes, and mediums such as desalted water, saturated steam or superheated steam are introduced into the boiler cluster pipes to exchange heat with high-temperature powder materials to form steam which can be used for waste heat power generation.
5. The sectional cooling system for reducing and calcine high-temperature powdered iron ore according to claim 1, wherein a gas pipe network (15) is arranged below the reducing furnace (1), a first cyclone dust collector (2) is further arranged above the reducing furnace (1), and the first cyclone dust collector (2) is communicated with a combustion chamber (9).
6. A sectional cooling system for high-temperature powdered iron ore reducing and roasting according to claim 1, characterized in that a nitrogen pipe network (16) is arranged below the first material sealing valve (5).
7. The sectional cooling system for reducing and calcining high-temperature powdered iron ore according to claim 1, wherein a nitrogen pipe network (16) is arranged below the second material sealing valve (17), and a nitrogen air chamber is arranged at the bottom of the second material sealing valve.
8. A sectional cooling system for high-temperature powdered iron ore reducing calcine according to claim 1, wherein the aerobic cooler (7) has a cavity structure inside, the bottom of the aerobic cooler is communicated with the atmosphere, and an auxiliary fluidized bed (12) and a centrifugal pressurizing fan (14) are sequentially arranged below the aerobic cooler.
9. A sectional cooling system for high-temperature powdered iron ore reducing calcine according to claim 1, characterized in that the cyclone separator (8) is of a cyclone cylinder structure, and the top of the cyclone separator (8) is communicated with the primary combustion chamber (9) of the roasting furnace.
10. A sectional cooling system for high-temperature powdered iron ore reducing calcine according to claim 1, wherein a supplementary water pipeline and a dust removal pipeline are arranged at the upper part of the slurry making tank (10).
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