CN112725556B - Method and device for heating pulverized coal by using blast furnace molten iron dedusting circulating hot flue gas - Google Patents
Method and device for heating pulverized coal by using blast furnace molten iron dedusting circulating hot flue gas Download PDFInfo
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- CN112725556B CN112725556B CN202110066136.2A CN202110066136A CN112725556B CN 112725556 B CN112725556 B CN 112725556B CN 202110066136 A CN202110066136 A CN 202110066136A CN 112725556 B CN112725556 B CN 112725556B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/002—Evacuating and treating of exhaust gases
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
- C21B2100/44—Removing particles, e.g. by scrubbing, dedusting
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
- C21B2100/66—Heat exchange
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y02P10/20—Recycling
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Abstract
The invention relates to a method and a device for heating coal powder by using circulating hot flue gas for blast furnace molten iron dust removal, belonging to the technical field of metallurgical iron-making coal injection processes and equipment. The technical scheme is as follows: the hot metal tank and the hot metal runner dedusting circulation hot flue gas in the blast furnace smelting tapping process are used as main heat sources, the hot flue gas generated by a gas combustion furnace or a burner is used as an auxiliary heat source, the pulverized coal injected into the blast furnace is heated, and the hot flue gas is recycled, so that the hot metal heat in the blast furnace smelting tapping process is utilized to the maximum extent. The invention has the following positive effects: the heat of molten iron is recovered to the maximum extent, the temperature of coal powder entering the blast furnace is increased, the burning rate of the coal powder is increased, the fuel ratio of the blast furnace is reduced, the coal powder replacement ratio is increased, the energy is saved, the consumption is reduced, and the carbon emission is reduced. The surrounding environment of a blast furnace casting house is improved, considerable economic benefit is created by increasing the temperature of the coal powder of the furnace, and the overall cost of the coal powder heating device is reduced.
Description
Technical Field
The invention relates to a method and a device for heating coal powder by using circulating hot flue gas for blast furnace molten iron dust removal, belonging to the technical field of metallurgical iron-making coal injection processes and equipment.
Background
At present, in the field of metallurgy iron making, the pulverized coal heating technology for blast furnace injection can effectively improve the combustion efficiency of pulverized coal, reduce the fuel ratio of the blast furnace, improve the replacement ratio of the pulverized coal, is gradually popularized and used, and creates considerable economic benefits for the blast furnace. However, the coal injection pulverized coal heating technology in the prior art adopts waste flue gas of a blast furnace hot blast stove or hot flue gas of a combustion furnace to heat pulverized coal, such as: the invention discloses a coal powder preheating process method of a blast furnace coal injection system in Chinese patent CN201410070774.1, and the like, and the problems in the prior art are that: the heat energy utilization efficiency is low, the hot flue gas (below 120 ℃) of the combustion furnace after the pulverized coal is heated is discharged into the atmosphere, and the heat energy is wasted.
Disclosure of Invention
The invention aims to provide a method and a device for heating coal powder by using circulating hot flue gas for dust removal of blast furnace molten iron, which fully utilize the heat of heat exchange between the molten iron and the dust removal flue gas in the blast furnace smelting tapping process to heat coal powder injection, return the discharged hot flue gas into a dust removal cover of a molten iron tank molten iron ditch, and circularly reciprocate, thereby utilizing the heat of the molten iron in the blast furnace smelting tapping process to the maximum extent, having high energy utilization efficiency and remarkable economic benefit and solving the problems in the prior art.
The technical scheme of the invention is as follows:
a method for heating coal powder by using circulating hot flue gas generated by dedusting of blast furnace molten iron is characterized in that the hot flue gas generated by a coal gas combustion furnace or a combustor is used as an auxiliary heat source to heat coal powder injected into a blast furnace by using the hot flue gas generated by a molten iron tank and a molten iron runner as main heat sources in the process of smelting and tapping the blast furnace. The invention fully utilizes the heat of the molten iron and the dedusting flue gas after heat exchange in the blast furnace smelting tapping process to heat the injected pulverized coal, and the pulverized coal is recycled, so that the heat of the molten iron in the blast furnace smelting tapping process is utilized to the maximum extent.
The hot flue gas generated after heat exchange between molten iron and the dedusting flue gas heats the pulverized coal, the heated pulverized coal is blown to the blast furnace, the hot flue gas heats the pulverized coal and then the temperature of the pulverized coal is reduced, the pulverized coal returns to the molten iron tank and the upper part of the molten iron ditch after dedusting to exchange heat, and the hot flue gas heats the pulverized coal.
A device for heating coal powder by using circulating hot flue gas for dedusting blast furnace molten iron is characterized in that a molten iron tank molten iron ditch dust hood is arranged above a molten iron tank, flue gas collected by the molten iron tank molten iron ditch dust hood enters a coal powder heater through a flue gas pipeline I, a coal powder heating pipe is arranged in the coal powder heater, one end of the coal powder heating pipe is connected with a blast furnace coal spraying pipeline through a coal powder and gas separation device, the other end of the coal powder heating pipe is connected with a coal spraying gun through a coal powder collecting and blowing device, and the coal spraying gun blows coal powder into the blast furnace; a flue gas outlet of the pulverized coal heater is connected with a dust remover and a circulating induced draft fan through a flue gas pipeline II; an outlet flue gas distributor is arranged between the hot metal ladle dust removing cover and the hot metal ladle, and a circulating induced draft fan is connected with the outlet flue gas distributor through a circulating pipeline.
The outlet flue gas distributor is an annular pipe arranged around the outer edge of the upper opening of the molten iron tank, and air outlet holes are densely distributed at the bottom of the annular pipe and face the molten iron tank; the annular pipe is connected with the circulating pipeline; the outlet flue gas distributor is horizontally and annularly arranged and is communicated with the outlet of the circulating draught fan through a circulating pipeline, and the discharged flue gas forms a layer of hot smoke curtain between cold air outside the hot metal ladle and the hot metal ladle runner dust hood, so that the cold air entering the hot metal ladle runner dust hood is reduced, and the temperature of the circulating hot flue gas is improved.
And the first flue gas pipeline is connected with a combustion furnace or a combustor.
The circulating induced draft fan is connected with the chimney through a first valve; and the circulating induced draft fan is connected with the circulating pipeline through a second valve.
A pulverized coal and gas separation device is arranged between the blast furnace coal injection pipeline and the pulverized coal heating pipe, the pulverized coal and gas separation device is a static separation bin body, the interior of the static separation bin body is divided into a left space and a right space by an ash blocking strip or an ash blocking tow, the right space is divided into an upper chamber and a lower chamber by an ash blocking filter layer, the upper chamber is communicated with the left space by the ash blocking strip or the ash blocking tow, the side wall of the lower chamber penetrates into a coal inlet pipe connected with the blast furnace coal injection pipeline, and the bottom of the lower chamber is provided with a pulverized coal outlet connected with the pulverized coal heating pipe; the top of the left part space is provided with a gas diffusing device.
The pulverized coal powder collecting and blowing device comprises a powder collecting section and a blowing section which are mutually communicated through a communicating pipeline; the powder collecting section is cylindrical, a plurality of connecting pipelines are uniformly arranged around the cylindrical surface, and the inner side of the powder collecting section is a cavity for storing coal powder; a plurality of connecting pipelines communicated with the pulverized coal heating pipes are uniformly distributed around the cylindrical surface of the pulverized coal collecting section; the injection section is provided with one or more coal outlets communicated with a coal injection gun, the upper part of the injection section is provided with an air inlet, the injection section is communicated with a pressure discharge pipeline of the pulverized coal and gas separation device and is also communicated with an injection pressurization pipeline, and the lower part of the injection section is provided with a fluidizing device used for fluidizing the pulverized coal during pulverized coal injection. The fluidizing means is a commercially available apparatus known and used in the art.
The bottom of buggy export is equipped with the shrouding, sets up a plurality of upper plate holes on the upper shrouding, and many buggy heating pipes are connected with respective upper plate hole respectively.
The dust blocking filter layer is composed of a grid belt and stones, the grid belt is a grid frame composed of two layers of steel wires or other materials, the stones are arranged in the grid belt, and the dust blocking filter layer plays a role that dust gas is blocked after contacting the surfaces of the stones when passing through gaps of the stones, and falls off after losing the ascending power.
The dust blocking strip or the dust blocking tows are made of filaments and are inversely hung in the static separation bin body, so that dust gas can pass through gaps of the dust blocking strip or the dust blocking tows, and the pulverized coal is blocked after contacting the surface of the dust blocking strip or the dust blocking tows and falls down after losing power.
The left part space is connected with the cyclone dust collector through a pressure discharge pipeline; and a sound wave ash removal device is matched above the ash blocking filter layer.
The seal pot is arranged in the pulverized coal outlet, the bottom of the lower cavity is of a funnel structure, the center of the funnel enters the seal pot in the pulverized coal outlet through the blanking pipe, the pulverized coal outlet is sealed, and the sealing performance of the pulverized coal and gas separation device is guaranteed.
The end part of the coal inlet pipe is provided with a buffer tank, and the impact force of the coal powder entering the lower chamber is reduced through the buffer tank.
The invention relates to a sound wave ash cleaning device, a gas diffusing device, a cyclone dust collector, a combustion furnace or a burner and the like, which are commercially available products.
The pulverized coal heating pipes are arranged in a pipe bundle, are seamless steel pipes and are provided with fins, so that the heat exchange area is increased.
The hot metal ladle and the hot metal runner dust hood are common dust hoods, and are arranged above the hot metal ladle and the hot metal runner; the dust remover is a conventional dust remover, such as a cyclone dust remover, a multi-tube dust remover, a bag-type dust remover, an electric dust remover, a filter cartridge dust remover and the like.
The combustion furnace or the combustor is a common combustion furnace and a common combustor, the combustion gas is combustible gas, and a hot flue gas outlet of the combustion furnace or the combustor is communicated with a flue gas pipeline I between the hot metal ladle dust hood and the pulverized coal heater.
The circulating induced draft fan is a common induced draft fan, a suction inlet of the circulating induced draft fan is communicated with a flue gas outlet of the pulverized coal heater, and an outlet of the circulating induced draft fan is communicated with the outlet flue gas distributor and the chimney.
And the first flue gas pipeline, the second flue gas pipeline and the circulating pipeline are provided with heat insulation layers, so that the heat loss is reduced.
The chimney is a conventional design exhaust chimney.
The shell of the pulverized coal heater is a steel middle shell body, a heat insulation layer is arranged outside the shell, the pulverized coal heating pipes are arranged in the shell, and hot flue gas passes through the shell and exchanges heat with the pulverized coal heating pipes to heat pulverized coal.
The middle outer shell is in a long-strip cylindrical shape and is horizontally arranged, one end of the middle outer shell is communicated with the first flue gas pipeline, and the other end of the middle outer shell is communicated with the second flue gas pipeline; the side wall of the top of the middle outer shell is provided with an upper connecting cylinder which is connected with a pulverized coal outlet, and the side wall of the bottom of the middle outer shell is provided with a lower connecting cylinder which is connected with a pulverized coal collecting and blowing device; the pipe bundle formed by a plurality of coal powder heating pipes enters the middle outer shell through the upper connecting cylinder for heating, and then is connected with the coal powder collecting and blowing device through the lower connecting cylinder; the bottom of the lower connecting cylinder is provided with a lower sealing plate, the lower sealing plate is provided with a plurality of lower plate holes, the pulverized coal heating pipes are respectively connected with the respective lower plate holes, and the pulverized coal heating pipes penetrate through the lower plate holes to be connected with a connecting pipeline of the pulverized coal collecting and blowing device.
The invention has the following positive effects: the heat of hot flue gas after the molten iron and the dust removal flue gas exchange heat in the blast furnace smelting tapping process is fully utilized to heat coal injection pulverized coal, the discharged hot flue gas returns to the dust removal cover of the molten iron tank molten iron runner, the hot flue gas is recycled, the heat of the molten iron is recovered to the maximum extent, the temperature of the coal entering the blast furnace pulverized coal is increased, the pulverized coal burnout rate is increased, the blast furnace fuel ratio is reduced, the pulverized coal replacement ratio is increased, energy is saved, consumption is reduced, and carbon emission is reduced. The dedusting effect of the cast house dedusting is enhanced, the surrounding environment of the blast furnace cast house is improved, the method is particularly suitable for the reconstruction of the blast furnace with insufficient dedusting capability of the blast furnace cast house, the surrounding environment of the cast house is improved, and considerable economic benefit is created by increasing the temperature of the furnace coal powder. Compared with other existing pulverized coal heating technologies, the pulverized coal heating device has the advantages that more effects can be created, and the overall cost of the pulverized coal heating device is reduced.
Drawings
FIG. 1 is a general schematic diagram of an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a pulverized coal heater according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a coal dust and gas separation device according to an embodiment of the present invention;
FIG. 4 is a schematic sectional view A-A of a pulverized coal and gas separation apparatus according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a pulverized coal collecting and blowing device according to an embodiment of the present invention;
FIG. 6 is a schematic structural view of a hot metal ladle and a dust hood according to an embodiment of the present invention;
FIG. 7 is a schematic view of a structure of an outlet flue gas distributor in the direction B according to an embodiment of the present invention;
in the figure: the hot metal ladle molten iron channel dust hood 1, the dust remover 2, the combustion furnace or the combustor 3, the circulating induced draft fan 4, the outlet flue gas distributor 5, a first flue gas pipeline 6, a chimney 7, a coal powder heater 8, a coal powder and gas separating device 9, a pressure discharge pipeline 10, a coal powder collecting and blowing device 11, a coal powder heating pipe 12, a coal spraying gun 13, a blast furnace 14, a middle outer shell 15, a spraying and pressurizing pipeline 16, a coal inlet pipe 17, a static separating cabin 18, a gas diffusing device 19, an acoustic wave ash cleaning device 20, a cyclone dust remover 21, an ash blocking filter layer 22, an ash blocking strip or an ash blocking tow 23, a coal powder outlet 24, a grid belt 25, a stone 26, a powder collecting section 27, a spraying section 28, a coal outlet 29, an air inlet 30, a fluidizing device 31, a hot metal ladle 32, an air outlet 33, a second flue gas pipeline 34, a first valve 35, a second valve 36, a buffer tank 37, a sealing tank 38, a circulating pipeline 39, an upper connecting cylinder 40, a lower connecting cylinder, a lower connecting device, a lower connecting device, a lower connecting device, a lower connecting device, a device, a lower connecting cylinder 41, a connecting pipeline 42 and a communicating pipeline 43.
Detailed Description
The invention is further described with reference to the following figures and examples:
a method for heating coal powder by using circulating hot flue gas generated by dedusting of blast furnace molten iron is characterized in that the hot flue gas generated by a coal gas combustion furnace or a combustor is used as an auxiliary heat source to heat coal powder injected into a blast furnace by using the hot flue gas generated by a molten iron tank and a molten iron runner as main heat sources in the process of smelting and tapping the blast furnace. The invention fully utilizes the heat of the molten iron and the dedusting flue gas after heat exchange in the blast furnace smelting tapping process to heat the injected pulverized coal, and the pulverized coal is recycled, so that the heat of the molten iron in the blast furnace smelting tapping process is utilized to the maximum extent.
The hot flue gas after heat exchange between the molten iron and the dedusting flue gas heats the pulverized coal, the heated pulverized coal is blown into the blast furnace, the hot flue gas heats the pulverized coal and then reduces the temperature of the pulverized coal, the pulverized coal returns to the upper part of the molten iron tank and the molten iron ditch after dedusting to exchange heat, and the hot flue gas heats the pulverized coal.
A device for heating coal powder by utilizing circulating hot flue gas for dedusting blast furnace molten iron is characterized in that a molten iron tank molten iron ditch dust hood 1 is arranged above a molten iron tank 32, flue gas collected by the molten iron tank molten iron ditch dust hood 1 enters a coal powder heater 8 through a flue gas pipeline I6, a coal powder heating pipe 12 is arranged in the coal powder heater 8, one end of the coal powder heating pipe 12 is connected with a blast furnace coal spraying pipeline through coal powder and gas separation devices 9, the other end of the coal powder heating pipe is connected with a coal powder spraying gun 13 through a coal powder collecting and spraying device 11, and the coal powder spraying gun 13 sprays coal powder into a blast furnace 14; the flue gas outlet of the pulverized coal heater 8 is connected with the dust remover 2 and the circulating induced draft fan 4 through a flue gas pipeline II 34; an outlet flue gas distributor 5 is arranged between the hot metal ladle dust removal cover 1 and the hot metal ladle 32, and the circulating induced draft fan 4 is connected with the outlet flue gas distributor 5 through a circulating pipeline 39.
The outlet flue gas distributor 5 is an annular pipe arranged around the outer edge of the upper opening of the hot metal ladle, air outlet holes 33 are densely distributed at the bottom of the annular pipe, and the air outlet holes 33 face the inside of the hot metal ladle; the loop pipe is connected with a circulation pipeline 39; 5 horizontal annular of export flue gas distributor arranges, and export flue gas distributor 5 passes through circulating line 39 and 4 exports of circulation draught fan intercommunication, and the hot smoke of one deck is formed to exhaust flue gas between hot metal bottle 32 outside cold air and hot metal bottle iron runner dust excluding hood 1, has reduced cold air entering hot metal bottle iron runner dust excluding hood 1, has improved the hot flue gas temperature of circulation.
The first flue gas pipeline 6 is connected with a combustion furnace or a combustor 3.
The circulating induced draft fan 4 is connected with the chimney 7 through a first valve 35; the circulating induced draft fan 4 is connected with a circulating pipeline 39 through a second valve 36.
A pulverized coal and gas separating device 9 is arranged between the blast furnace coal injection pipeline and the pulverized coal heating pipe 12, the pulverized coal and gas separating device 9 is a static separating bin body 18, the interior of the static separating bin body is divided into a left space and a right space by an ash blocking strip or an ash blocking filament bundle 23, the right space is divided into an upper chamber and a lower chamber by an ash blocking filter layer 22, the upper chamber is communicated with the left space by the ash blocking strip or the ash blocking filament bundle 23, the side wall of the lower chamber penetrates into a coal inlet pipe 17 connected with the blast furnace coal injection pipeline, and the bottom of the lower chamber is provided with a pulverized coal outlet 24 connected with the pulverized coal heating pipe 12; the top of the left part space is provided with a gas diffusing device 19.
The pulverized coal powder collecting and blowing device 11 comprises a powder collecting section 27 and a blowing section 28 which are mutually communicated through a communication pipeline 43; the powder collecting section is cylindrical, a plurality of connecting pipelines 42 are uniformly arranged around the cylindrical surface, and the inner side of the powder collecting section is a cavity for storing coal powder; a plurality of connecting pipelines 42 communicated with the pulverized coal heating pipe 12 are uniformly distributed around the cylindrical surface of the powder collecting section; the injection section 28 is provided with one or more coal outlets 29 communicated with a coal injection gun 13, the upper part of the injection section 28 is provided with an air inlet 30, the injection section 28 is communicated with a pressure discharge pipeline 10 of a coal dust and gas separation device 9 and is also communicated with an injection pressurization pipeline 16, and the lower part of the injection section 28 is provided with a fluidizing device 31 for fluidizing the coal dust during coal dust injection. The fluidizing means is a commercially available apparatus known and used in the art.
The bottom of the pulverized coal outlet 24 is provided with an upper sealing plate, the upper sealing plate is provided with a plurality of upper plate holes, and the pulverized coal heating pipes 12 are respectively connected with the respective upper plate holes.
The dust-blocking filter layer 22 is composed of a mesh belt 25 and stones 26, the mesh belt 25 is a mesh frame composed of two layers of steel wires or other materials, the stones 26 are arranged in the mesh belt, and the dust-blocking filter layer has the function that when dust gas passes through gaps of the stones 26, the dust is blocked after contacting the surfaces of the stones 26, and falls off after losing the ascending power.
The ash blocking strip or the ash blocking tow 23 is made of filaments and is inversely hung in the static separation bin body 18, so that dust gas can pass through gaps of the ash blocking strip or the ash blocking tow, and the pulverized coal is blocked after contacting the surface of the ash blocking strip or the ash blocking tow and falls down after losing power.
The left part space is connected with a cyclone dust collector 21 through a pressure discharge pipeline 10; the upper part of the dust blocking filter layer 22 is matched with the sound wave ash cleaning device 20.
The sealing tank 38 is arranged in the coal powder outlet 24, the bottom of the lower cavity is of a funnel structure, the center of the funnel enters the sealing tank 38 in the coal powder outlet 24 through the blanking pipe to seal the coal powder outlet 24, and the sealing performance of the coal powder and gas separation device 9 is guaranteed.
The end of the coal inlet pipe 17 is provided with a buffer tank 37, and the impact force of the coal powder entering the lower chamber is reduced through the buffer tank 37.
The invention relates to a sound wave ash cleaning device 20, a gas diffusing device 19, a cyclone dust collector 21, a combustion furnace or a combustor 3 and the like, which are commercially available products.
The pulverized coal heating pipes 12 are arranged in a tube bundle, and the pulverized coal heating pipes 12 are seamless steel pipes and are provided with fins, so that the heat exchange area is increased.
The hot metal ladle molten iron channel dust hood 1 is a common dust hood, and the hot metal ladle molten iron channel dust hood 1 is arranged above the hot metal ladle 32 and the hot metal channel; the dust remover 2 is a conventional dust remover, such as a cyclone dust remover, a multi-tube dust remover, a bag-type dust remover, an electric dust remover, a filter cartridge dust remover and the like.
The combustion furnace or the combustor 3 is a common combustion furnace and a common combustor, the combustion gas is combustible gas, and a hot flue gas outlet of the combustion furnace or the combustor is communicated with a flue gas pipeline I6 between the hot metal ladle dust removal cover 1 and the pulverized coal heater 8.
The circulation draught fan 4 is a common draught fan, a suction inlet of the circulation draught fan 4 is communicated with a smoke outlet of the pulverized coal heater 8, and an outlet of the circulation draught fan 4 is communicated with the outlet smoke distributor 5 and the chimney 7.
And the first flue gas pipeline 6, the second flue gas pipeline 34 and the circulating pipeline 39 are provided with heat-insulating layers, so that the heat loss is reduced.
The chimney 7 is a conventional design exhaust chimney.
The shell of the pulverized coal heater 8 is a steel middle shell body 15, a heat insulation layer is arranged outside the shell, the pulverized coal heating pipes 12 are arranged in the shell, hot smoke passes through the shell, exchanges heat with the pulverized coal heating pipes 12, and is used for heating pulverized coal.
The middle outer shell 15 is in a long-strip cylindrical shape and is horizontally arranged, one end of the middle outer shell is communicated with the first flue gas pipeline 6, and the other end of the middle outer shell is communicated with the second flue gas pipeline 34; the side wall of the top of the middle outer shell 15 is provided with an upper connecting cylinder 40 which is connected with the coal powder outlet 24, and the side wall of the bottom of the middle outer shell 15 is provided with a lower connecting cylinder 41 which is connected with the coal powder collecting and blowing device 11; a tube bundle formed by a plurality of pulverized coal heating pipes 12 enters the middle outer shell 15 through the upper connecting cylinder 40 for heating, and then is connected with the pulverized coal collecting and blowing device 11 through the lower connecting cylinder 41; the bottom of the lower connecting cylinder 41 is provided with a lower sealing plate, the lower sealing plate is provided with a plurality of lower plate holes, the plurality of pulverized coal heating pipes 12 are respectively connected with the respective lower plate holes, and the plurality of pulverized coal heating pipes 12 penetrate through the lower plate holes to be connected with a connecting pipeline 42 of the pulverized coal collecting and blowing device 11.
The specific process flow of the embodiment is as follows:
an inlet of a circulating induced draft fan 4 is communicated with an outlet of the hot metal ladle molten iron ditch dust hood 1 through a dust remover 2, a smoke pipeline II 34, a pulverized coal heater 8 and a smoke pipeline I6 in sequence, and an outlet of the circulating induced draft fan 4 is connected with an outlet smoke distributor 5 through a circulating pipeline 39;
when the system works, gas from an outlet of the circulating draught fan 4 is sprayed to the hot metal ladle 32 from top to bottom through the gas outlet 33 of the outlet flue gas distributor 5, then rises under the action of the draught force of the circulating draught fan 4, exchanges heat with flowing molten iron in a molten iron ladle molten iron ditch, hot flue gas is sucked into the first flue gas pipeline 6, meanwhile, high-temperature flue gas of the combustion furnace or the combustor 3 is also sucked into the first flue gas pipeline 6, two flue gases are mixed to a set temperature and enter the pulverized coal heater 8, the hot flue gas exchanges heat with pulverized coal in the pulverized coal heating pipe 12 in the pulverized coal heater 8, and the heating temperature of the pulverized coal can be adjusted through the high-temperature hot flue gas quantity of the combustion furnace or the combustor 3; the flue gas after heat exchange enters the dust remover 2 for dust removal through a second flue gas pipeline 34, and then enters the circulating induced draft fan 4 and returns to the outlet flue gas distributor 5 through a circulating pipeline 39. The hot flue gas forms the hot smoke screen of one deck between hot metal bottle iron runner dust excluding hood 1 and the air in the hot metal bottle 32 outside, has just so reduced cold air and has got into hot metal bottle iron runner dust excluding hood 1, and the flue gas carries out the heat exchange with molten iron and high temperature radiation heat energy in hot metal bottle iron runner dust excluding hood 1, further heats the flue gas temperature, and hot flue gas is inhaled flue gas pipeline one 6 once more, and the circulation is reciprocal.
The coal powder from the blast furnace coal injection pipeline enters a coal powder and gas separation device 9 for separating the coal powder and the gas; the separated gas enters a pressure discharge pipeline 10 after being dedusted by a cyclone deduster 21 and then enters a pulverized coal collecting and blowing device 11; the separated coal powder enters a coal powder heating pipe 12, heat exchange is carried out between the coal powder heater 8 and hot smoke outside the coal powder heating pipe 12, the heated coal powder enters a powder collecting section 27 of a coal powder collecting and blowing device 11 and enters an injection section 28 of the coal powder collecting and blowing device 11 through a communication pipeline 43, fluidization is carried out in the injection section 28, and the coal powder is injected into a blast furnace 14 through a coal injection gun 13 under the combined action of injection gas from an injection pressurizing pipeline 16 and gas pressure generated by a coal powder and gas separating device 9 from a pressure exhaust pipeline 10.
The combustion furnace or burner 3 of the invention can be used all the time, the coal powder heating temperature can be adjusted, and the combustion furnace or burner can also be used in normal production of a blast furnace, and the coal powder heating temperature is stable and then is stopped.
The invention can adjust and control most or all hot smoke to return to the outlet smoke distributor 5 through the circulating pipeline 39 by opening and closing the first valve 35 and the second valve 36, and a small part of the hot smoke is discharged from the smoke tube 7.
Claims (7)
1. The utility model provides an utilize device of hot flue gas heating buggy of blast furnace molten iron dust removal circulation which characterized in that: a molten iron tank molten iron ditch dust hood (1) is arranged above the molten iron tank (32), flue gas collected by the molten iron tank molten iron ditch dust hood (1) enters a pulverized coal heater (8) through a flue gas pipeline I (6), a pulverized coal heating pipe (12) is arranged in the pulverized coal heater (8), one end of the pulverized coal heating pipe (12) is connected with a blast furnace coal injection pipeline through a pulverized coal and gas separation device (9), the other end of the pulverized coal heating pipe is connected with a coal injection gun (13) through a pulverized coal collecting and blowing device (11), and the coal injection gun (13) injects pulverized coal into a blast furnace (14); a flue gas outlet of the pulverized coal heater (8) is connected with the dust remover (2) and the circulating induced draft fan (4) through a flue gas pipeline II (34); an outlet flue gas distributor (5) is arranged between the hot metal ladle dust removal cover (1) and the hot metal ladle (32), and a circulating induced draft fan (4) is connected with the outlet flue gas distributor (5) through a circulating pipeline (39);
a coal powder and gas separation device (9) is arranged between the blast furnace coal injection pipeline and the coal powder heating pipe (12), the coal powder and gas separation device (9) is a static separation bin body (18), the inside of the static separation bin body is divided into a left space and a right space by an ash blocking strip or an ash blocking tow (23), the right space is divided into an upper chamber and a lower chamber by an ash blocking filter layer (22), the upper chamber is communicated with the left space by the ash blocking strip or the ash blocking tow (23), the side wall of the lower chamber penetrates into a coal inlet pipe (17) connected with the blast furnace coal injection pipeline, and the bottom of the lower chamber is provided with a coal powder outlet (24) connected with the coal powder heating pipe (12); the top of the left part space is provided with a gas diffusing device (19).
2. The device for heating pulverized coal by using the circulating hot flue gas for blast furnace molten iron dust removal according to claim 1, which is characterized in that: the pulverized coal powder collecting and blowing device (11) comprises a powder collecting section (27) and a blowing section (28) which are mutually communicated through a communication pipeline (43); the powder collecting section is cylindrical, a plurality of connecting pipelines (42) are uniformly arranged around the cylindrical surface, and the inner side of the powder collecting section is a cavity for storing coal powder; a plurality of connecting pipelines (42) communicated with the pulverized coal heating pipes (12) are uniformly distributed around the cylindrical surface of the powder collecting section; the injection section (28) is provided with one or more coal outlets (29) communicated with the coal injection gun (13), the upper part of the injection section (28) is provided with an air inlet (30), the injection section (28) is communicated with a pressure discharge pipeline (10) of the coal dust and gas separation device (9) and is simultaneously communicated with an injection pressurization pipeline (16), and the lower part of the injection section (28) is provided with a fluidizing device (31) for fluidizing the coal dust during coal dust injection.
3. The device for heating pulverized coal by using the circulating hot flue gas for blast furnace molten iron dust removal according to claim 1, characterized in that: the bottom of buggy export (24) is equipped with the shrouding, sets up a plurality of upper plate holes on the upper shrouding, and many buggy heating pipe (12) are connected with respective upper plate hole respectively.
4. The device for heating pulverized coal by using the circulating hot flue gas for blast furnace molten iron dust removal according to claim 1, characterized in that: the outlet flue gas distributor (5) is an annular pipe arranged around the outer edge of the upper opening of the hot metal ladle, air outlet holes (33) are densely distributed at the bottom of the annular pipe, and the air outlet holes (33) face the inside of the hot metal ladle; the annular pipe is connected with a circulating pipeline (39); export gas distributor (5) horizontal ring shape is arranged, and export gas distributor (5) are through circulating line (39) and circulation draught fan (4) export intercommunication, and exhaust flue gas forms the hot smoke screen of one deck between cold air in hot metal bottle (32) outside and hot metal bottle iron runner dust excluding hood (1), has reduced cold air entering hot metal bottle iron runner dust excluding hood (1), has improved the hot flue gas temperature of circulation.
5. The device for heating pulverized coal by using the circulating hot flue gas for blast furnace molten iron dust removal according to claim 1, characterized in that: the first flue gas pipeline (6) is connected with a combustion furnace or a combustor (3).
6. The device for heating pulverized coal by using the circulating hot flue gas for blast furnace molten iron dust removal according to claim 1, which is characterized in that: the shell of the pulverized coal heater (8) is a steel middle shell body (15), a heat preservation layer is arranged outside the shell, a plurality of pulverized coal heating pipes (12) are arranged in the shell, hot smoke passes through the shell, exchanges heat with the pulverized coal heating pipes (12) and is used for heating pulverized coal.
7. The device for heating pulverized coal by using the circulating hot flue gas for blast furnace molten iron dust removal according to claim 6, characterized in that: the middle outer shell (15) is in a long-strip cylindrical shape and is horizontally arranged, one end of the middle outer shell is communicated with the first flue gas pipeline (6), and the other end of the middle outer shell is communicated with the second flue gas pipeline (34); the side wall of the top of the middle outer shell (15) is provided with an upper connecting cylinder (40) which is connected with the coal powder outlet (24), and the side wall of the bottom of the middle outer shell (15) is provided with a lower connecting cylinder (41) which is connected with the coal powder collecting and blowing device (11); a tube bundle formed by a plurality of pulverized coal heating tubes (12) enters the middle outer shell (15) through an upper connecting cylinder (40) for heating, and then is connected with a pulverized coal collecting and blowing device (11) through a lower connecting cylinder (41); the bottom of the lower connecting cylinder (41) is provided with a lower sealing plate, the lower sealing plate is provided with a plurality of lower plate holes, and the plurality of pulverized coal heating pipes (12) are respectively connected with the respective lower plate holes.
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6347311A (en) * | 1986-08-18 | 1988-02-29 | Nippon Kokan Kk <Nkk> | Smelting, reducing and refining equipment |
| CN100535127C (en) * | 2008-03-07 | 2009-09-02 | 山西潞安矿业(集团)有限责任公司 | Pre-heating technique of blast furnace before blowing coal powder |
| CN201599815U (en) * | 2010-02-25 | 2010-10-06 | 杨永义 | Flue gas circulation heat exchange device of coal injection system |
| CN102605119B (en) * | 2012-04-13 | 2016-08-03 | 孙慕文 | Coal dust conveying during a kind of pulverized coal injection in blast furnace and pre-heating technique device |
| JP6012360B2 (en) * | 2012-09-20 | 2016-10-25 | 三菱重工業株式会社 | Pulverized coal blowing device, blast furnace equipment equipped with the same, and pulverized coal supply method |
| CN103122398B (en) * | 2013-03-13 | 2015-01-28 | 中冶赛迪工程技术股份有限公司 | Smoke self-circulation preheating coal dust injection technology and device |
| CN110129497B (en) * | 2019-05-13 | 2024-04-16 | 鞍钢集团工程技术有限公司 | Series preheating process and system for pulverized coal injection of blast furnace and air/gas of hot blast stove |
| CN110607407A (en) * | 2019-09-19 | 2019-12-24 | 湖南建鑫冶金科技有限公司 | Energy-saving and yield-increasing method for preheating agglomerated materials by hot flue gas of blast furnace main channel |
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