CN212293639U - Hydrogen metallurgy device - Google Patents
Hydrogen metallurgy device Download PDFInfo
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- CN212293639U CN212293639U CN202020642881.8U CN202020642881U CN212293639U CN 212293639 U CN212293639 U CN 212293639U CN 202020642881 U CN202020642881 U CN 202020642881U CN 212293639 U CN212293639 U CN 212293639U
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Abstract
The utility model relates to a hydrogen metallurgy device belongs to metallurgical technical field, has solved among the prior art steel smelting and has discharged a large amount of waste gases and useless solid, polluted environment scheduling problem. The hydrogen metallurgical device of the utility model comprises a hydrogen reducing furnace (1), a gas supply and circulation system and a high-temperature smelting furnace (16); the hydrogen reduction furnace (1) is used for reducing the iron ore raw material into direct reduced iron by adopting hydrogen; the gas supply and circulation system is connected with the hydrogen reduction furnace (1) and is used for supplying hydrogen to the hydrogen reduction furnace (1); the high-temperature smelting furnace (16) is used for smelting the direct reduced iron; the gas supply and circulation system comprises a water-hydrogen production system (5), a second hydrogen compressor (6), a regulating valve group (7), a third hydrogen compressor (8), a heater (9) and a preheater (10). The utility model discloses hydrogen metallurgical system is applicable to the green smelting technology of environmental protection.
Description
Technical Field
The utility model belongs to the technical field of the metallurgy, in particular to hydrogen metallurgy device.
Background
In recent years, the environmental protection problem of the steel industry is becoming one of the key problems restricting the development of the industry, especially SO2、NOxAnd solid waste discharge, the existing treatment mode mainly focuses on desulfurization and denitrification of tail end flue gas and partial utilization of solid waste (wherein the steel-making slag mainly takes stockpiling as a main part), and the environmental protection problem of steel enterprises cannot be fundamentally solved.
The existing steel smelting process mainly comprises a long process of 'blast furnace-converter' taking iron ore as a raw material and an electric furnace process taking scrap steel as a raw material, wherein a blast furnace ironmaking unit comprises the working procedures of coking, sintering, pelletizing, blast furnace ironmaking and the like, a converter steelmaking unit comprises the working procedures of molten iron desulphurization, converter dephosphorization and the like, and the working procedures are complex; meanwhile, the traditional process takes carbon energy as fuel, and the carbon energy brings a large amount of CO2、SO2And NOxThe pollution gas emission and the solid waste emission of a large amount of slag, dust and the like.
SUMMERY OF THE UTILITY MODEL
In view of the above analysis, the utility model aims at a hydrogen metallurgy device, adopts the utility model discloses hydrogen metallurgy system carries out the iron and steel smelting, and SO2Almost has no emission, reduces the dust emission by more than 90 percent compared with the traditional process, has no waste slag emission, and is used for solving the problems of solid waste, environmental pollution and the like caused by a large amount of waste gas discharged in the steel smelting in the prior art.
The purpose of the utility model is mainly realized through the following technical scheme:
a hydrogen metallurgical device comprises a hydrogen reduction furnace, a gas supply and circulation system and a high-temperature smelting furnace;
the gas supply and circulation system comprises a water-hydrogen production system, a second hydrogen compressor, a regulating valve group, a third hydrogen compressor, a heater and a preheater;
the water hydrogen production system, the third hydrogen compressor, the preheater and the heater are sequentially connected, and the heater is connected with the middle part of the furnace body of the hydrogen reduction furnace;
the water hydrogen production system, the second hydrogen compressor and the regulating valve group are sequentially connected, and the regulating valve group is connected with the lower part of the furnace body of the hydrogen reduction furnace;
the hydrogen reduction furnace is used for reducing the iron ore raw material into direct reduced iron by adopting hydrogen; the gas supply and circulation system is connected with the hydrogen reduction furnace and is used for supplying hydrogen to the hydrogen reduction furnace; the high-temperature smelting furnace is used for smelting the direct reduced iron.
In one possible design, a charging system is further included for charging iron ore raw material into the hydrogen reduction furnace from a furnace top thereof.
In one possible design, the feeding system comprises an upper tank and a lower tank which are connected in series, the upper tank is provided with an upper valve, a middle valve is arranged between the upper tank and the lower tank, and the lower tank is provided with a lower valve.
In one possible design, the gas supply and circulation system further comprises a gas purifier, a first dehydrator, and a first hydrogen compressor;
in one possible design, the top of the hydrogen reduction furnace, the coal gas purifier, the first dehydrator, the first hydrogen compressor and the preheater are connected in sequence; the first dehydrator is also connected with a water hydrogen production system.
In one possible design, the gas supply and circulation system further comprises a blower for passing air into the preheater.
In one possible design, the gas supply and circulation system further comprises a second water separator and a chimney;
one end of the second dehydrator is connected with the preheater, and the other end of the second dehydrator is connected with the water hydrogen production system; the chimney is connected with the second dehydrator.
In one possible design, the hydrogen metallurgy system further comprises a steel slag modifying furnace for modifying the high-temperature liquid steel-making slag discharged by the high-temperature smelting furnace.
In one possible design, the pyrometallurgical furnace is provided with an auxiliary material addition system and a circulating slag feed opening.
In one possible design, a first heat exchange tube, a second heat exchange tube and a third heat exchange tube are arranged in the preheater and are respectively used for preheating air, hydrogen for combustion and hydrogen introduced into the middle of the hydrogen reduction furnace.
In one possible design, the preheater has a low temperature preheating section and a high temperature preheating section, the first and second heat exchange tubes being in the low temperature preheating section, and the third heat exchange tube being in the high temperature preheating section.
Compared with the prior art, the utility model discloses can realize one of following technological effect at least:
1) the device of the utility model can replace the traditional long flow of blast furnace-converter for steel smelting, and the device of the utility model needs two units of hydrogen reduction and high temperature smelting furnace steel making, so the process can greatly reduce the production procedures and the production cost; the process uses hydrogen as a reducing agent, the product after reaction is water, and SO is not generated in the smelting process2Discharging; iron-smelting uses coke, buggy etc. to smelt among the prior art, can carburize in the iron, and the steelmaking process is again at the decarbonization process, the utility model discloses use hydrogen reduction iron ore, can not bring into carbon, so the steelmaking process also need not the decarbonization, consequently this technology is the green smelting technology of a very environmental protection.
2) The utility model discloses the energy structure of current iron and steel smelting flow has been changed, the utility model discloses a pure hydrogen is smelted the iron ore, and the basic water that produces can not discharge carbon dioxide to can cyclic utilization, not have flue gas desulfurization denitration problem, also not have the solid waste discharge problem, be a hydrogen metallurgy device of nearly zero release.
3) In the traditional process, impurities in coke and coal powder can enter iron, particularly sulfur; the process of the utility model does not use carbonaceous energy, and does not bring in the problem of impurities caused by the carbonaceous energy, thereby being more beneficial to smelting pure steel, and the smelted pure molten steel has higher use value.
4) The traditional iron-making process comprises at least three processes of coking, sintering, blast furnace and the like, but the iron-making process of the utility model only comprises 1 process, the equipment quantity is reduced by more than 50 percent, the personnel number is reduced by more than 70 percent, and the smelting process is shorter; and the process is a very environment-friendly green smelting process, and the production cost of the utility model is lower in consideration of comprehensive conditions such as environmental protection treatment and the like.
5) Hydrogen reduction furnace discharge direct reduced iron is spongy iron, and the activity is higher, easily is oxidized, the utility model discloses in set up sealed conveyor, directly get into high temperature smelting furnace through sealed conveyor after can making hydrogen reduction furnace discharge direct reduced iron, whole process has inert gas to protect, prevents that direct reduced iron from oxidizing once more. In addition, because the sealed conveying device is arranged, the temperature of the directly reduced iron discharged from the hydrogen reduction furnace can be controlled to be 50-600 ℃, and the temperature can be seen to be higher, so that the requirement can be met by adopting low-temperature hydrogen for cooling without arranging a separate cooling device.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout the figures.
FIG. 1 is a schematic view of a hydrogen metallurgy apparatus according to the present invention;
FIG. 2 is a flow diagram of a near zero emission hydrometallurgical process.
Reference numerals
1-a hydrogen reduction furnace; 2-a gas purifier; 3-a first dehydrator; 4-a first hydrogen compressor; 5-a water hydrogen production system; 6-a second hydrogen compressor; 7-adjusting the valve group; 8-a third hydrogen compressor; 9-a heater; 10-a preheater; 11-a second dehydrator; 12-a chimney; 13-a blower; 14-a feeding system; 15-sealing the conveying device; 16-high temperature smelting furnace; 17-an auxiliary material adding system; 18-pure molten steel; 19-a steel slag modifying furnace; 20-a slag modifier; 21-phosphorus containing by-product.
Detailed Description
A hydrometallurgical plant is described in further detail below with reference to specific examples, which are provided for purposes of comparison and explanation only and to which the present invention is not limited.
The utility model discloses a hydrogen metallurgy device, as shown in figure 1, comprising a hydrogen reduction furnace 1, a gas supply and circulation system, a sealing and conveying device 15 and a high-temperature smelting furnace 16; the hydrogen reduction furnace 1 is used for reducing iron ore raw materials into direct reduced iron by using hydrogen; the gas supply and circulation system is connected to the hydrogen reduction furnace 1 and is used for supplying hydrogen to the hydrogen reduction furnace 1.
The gas supply and circulation system comprises a coal gas purifier 2, a first dehydrator 3, a first hydrogen compressor 4, a water hydrogen production system 5, a second hydrogen compressor 6, a regulating valve group 7, a third hydrogen compressor 8, a heater 9, a preheater 10, a second dehydrator 11, a chimney 12 and a blower 13.
The water hydrogen production system 5, the third hydrogen compressor 8, the preheater 10 and the heater 9 are sequentially connected, and the heater 9 is connected with the middle part of the furnace body of the hydrogen reduction furnace 1; the water hydrogen production system 5, the second hydrogen compressor 6 and the regulating valve group 7 are sequentially connected, and the regulating valve group 7 is connected with the lower part of the hydrogen reduction furnace 1.
After being pressurized by a third hydrogen compressor 8, hydrogen produced by the water hydrogen production system 5 in the gas supply and circulation system enters a preheater 10 to be preheated to 700 ℃ of 300-; the other path of hydrogen passes through a second hydrogen compressor 6 and an adjusting valve group 7, the temperature of the hydrogen is (-50) DEG C-50 ℃, the hydrogen is introduced from the bottom of the hydrogen reduction furnace 1, low-temperature hydrogen is introduced from the bottom, the reduced material is cooled, meanwhile, the hydrogen is heated by the reduced high-temperature material, and the hydrogen rises to be mixed with the high-temperature hydrogen introduced from the middle part to reduce the iron ore raw material. The second part of hydrogen (i.e. the other path of hydrogen) produced by the water hydrogen production system 5 accounts for 50-70% of the water hydrogen production volume.
The temperature of the directly reduced iron discharged from the hydrogen reduction furnace 1 is 50-600 ℃, and the metallization rate of the directly reduced iron is more than 90%.
The pressure of hydrogen in the gas supply and circulation system after passing through a third hydrogen compressor 8 is 0.2-1Mpa, the pressure loss of the hydrogen after passing through a preheater 10 and a heater 9 is 0.1-0.9Mpa, and the pressure of the hydrogen entering a hydrogen reduction furnace is 0.1-0.9 Mpa; the pressure of the hydrogen after passing through the second hydrogen compressor 6 is 0.2-1Mpa, and the pressure of the hydrogen after passing through the regulating valve group 7 is 0.1-0.9 Mpa. The pressure of hydrogen entering the hydrogen reduction furnace is set to be 0.1-0.9Mpa, so that the reaction rate can be improved, too high energy consumption cannot be caused, and better economic benefit can be obtained.
The top of the hydrogen reduction furnace 1, the coal gas purifier 2, the first dehydrator 3, the first hydrogen compressor 4 and the preheater 10 are connected in sequence; the first dehydrator 3 is also connected with a water hydrogen production system 5. Gas discharged from the top of the hydrogen reduction furnace 1 passes through a gas purifier 2 and a first dehydrator 3, and water separated by the first dehydrator 3 is directly returned to a water hydrogen production system 5 for recycling; the hydrogen separated by the first dehydrator 3 is divided into two parts, the first part is mixed with the hydrogen passing through the third hydrogen compressor 8 by the first hydrogen compressor 4 and then enters the preheater 10, the second part of the hydrogen is used as fuel gas, is preheated to 50-300 ℃ by using waste heat of the preheater 10, then enters the heater 9 for combustion, and heats the hydrogen introduced into the middle part of the hydrogen reduction furnace 1 by indirect heat exchange. The second part of the hydrogen separated by the first dehydrator 3 is less than 15% of the total separated gas volume.
The blower 13 is used for introducing air into the preheater 10, one end of the second dehydrator 11 is connected with the preheater 10, and the other end of the second dehydrator is connected with the water hydrogen production system 5; the chimney 12 is connected to the second water separator 11. A blower 13 in the gas supply and circulation system heats air to 50-300 ℃ through a preheater 10, then the air enters a heater 9 to be combusted with a second part of hydrogen separated from a first dehydrator 3, high-temperature flue gas generated after combustion is used as a heat source of the preheater 10, the temperature of the flue gas discharged after passing through the preheater 10 is 100-300 ℃, the flue gas passes through a second dehydrator 11 to condense water vapor in the flue gas, the obtained water is circulated to a water hydrogen production system 5, and the rest of the flue gas is discharged from a chimney 12.
Preferably, the preheater 10 is divided into a low temperature preheating section and a high temperature preheating section, and the preheater 10 is provided with a first heat exchange tube, a second heat exchange tube and a third heat exchange tube for respectively preheating air, hydrogen for combustion and hydrogen introduced into the middle of the shaft furnace (i.e., the hydrogen reduction furnace). The first heat exchange tube and the second heat exchange tube are arranged in the low-temperature preheating section, and the third heat exchange tube is arranged in the high-temperature preheating section.
The hydrogen metallurgical system further includes a charging system 14 for charging iron ore raw material into the hydrogen reducing furnace 1 from the top thereof. A feeding system 14 at the top of the hydrogen reducing furnace 1 is used for feeding materials in a sealing manner, and gas in the furnace is not discharged outside through the feeding system; the discharge system at the bottom of the furnace is also sealed for discharging, and gas in the furnace cannot be discharged outside through the discharge opening. Illustratively, a tandem tank feeding is used, i.e., the feeding system comprises an upper tank and a lower tank which are connected in series, the upper tank is provided with an upper valve, an intermediate valve is arranged between the upper tank and the lower tank, and the lower tank is provided with a lower valve. When feeding, firstly opening an upper valve of an upper tank, feeding the material into the upper tank, then closing the upper valve of the upper tank, then opening an intermediate valve between the two tanks, and closing the intermediate valve after the material enters the lower tank; then the lower valve under the lower tank is opened to finish feeding. The discharging system has the opposite discharging sequence to the feeding sequence.
The hydrogen metallurgy system further comprises a sealing conveying device 15, the high-temperature smelting furnace 16 is connected with the hydrogen reduction furnace 1 through the sealing conveying device 15, the sealing conveying device 15 is used for inputting and conveying direct reduced iron into the high-temperature smelting furnace 16, the sealing conveying device 15 is a material thermal connector between the hydrogen reduction furnace 1 and the high-temperature smelting furnace 16, a heat-preservation refractory material is lined in a closed shell of the sealing conveying device, and meanwhile, non-oxidative protection gas such as nitrogen, argon and the like is introduced into the sealing conveying device.
1 discharge direct reduced iron of hydrogen reduction furnace is spongy iron, and the activity is higher, easily is oxidized, the utility model discloses in set up sealed conveyor 15, directly get into pyrometallurgical furnace 16 through sealed conveyor 15 after can making 1 discharge direct reduced iron of hydrogen reduction furnace, whole process has inert gas to protect, prevents that direct reduced iron from oxidizing once more. In addition, because the sealed conveying device 15 is arranged, the temperature of the directly reduced iron discharged from the hydrogen reduction furnace 1 can be controlled to be 50-600 ℃, and the visible temperature can be higher, so that the requirement can be met by adopting low-temperature hydrogen for cooling without arranging a separate cooling device.
The melting temperature of the reduced iron is above 1300 ℃, and the high-temperature smelting furnace 16 is a high-temperature furnace using electric energy, such as an electric furnace, a plasma furnace, and the like. The high-temperature smelting furnace 16 is provided with an auxiliary material adding system 17 and a circulating steel slag feeding port, and pure molten steel 18 and smelting steel slag are obtained after steel making is carried out by the high-temperature smelting furnace 16.
Further, the hydrogen metallurgy system further comprises a steel slag modifying furnace 19 for modifying the high-temperature liquid steel-making slag discharged by the high-temperature smelting furnace. The steel slag modifying furnace 19 is a high temperature furnace using electric energy, such as an electric furnace, a plasma furnace, etc., the raw material of the steel slag modifying furnace 19 is high temperature liquid smelting steel slag discharged from the high temperature smelting furnace 16, and a steel slag modifier 20 is added into the furnace to realize dephosphorization of the steel slag, wherein the steel slag modifier 20 is one of pulverized coal, silicon powder, etc. by way of example. The dephosphorized new steel slag can be recycled to the high-temperature smelting furnace 16 through a recycled steel slag charging hole, the phosphorus content in the new steel slag is less than 0.5 percent, and a phosphorus-containing byproduct 21 obtained by dephosphorization can be used as a raw material for preparing ferro-phosphorus or phosphate fertilizer.
The near zero emission hydrometallurgical process, as shown in fig. 2, comprises the following steps:
s1, feeding iron ore raw materials into the furnace from the top of the hydrogen reduction furnace 1 through a feeding system, discharging direct reduced iron from the bottom of the hydrogen reduction furnace 1 after hydrogen reduction, and introducing hydrogen into the middle part and the lower part of the furnace body of the hydrogen reduction furnace 1 respectively;
s2, discharging the directly reduced iron from the hydrogen reduction furnace 1, and conveying the directly reduced iron to the high-temperature smelting furnace 16 through a sealed conveying device;
s3, the high-temperature smelting furnace 16 melts the direct reduced iron by increasing the temperature, produces pure molten steel 18 by slagging and discharges steel-making slag;
s4, directly feeding the high-temperature liquid steel-making slag discharged from the high-temperature smelting furnace 16 into a steel slag modification furnace 19 for modification, and realizing dephosphorization of the steel slag in the modification furnace to obtain phosphorus-containing by-products 21 and new steel slag;
s5, directly circulating the new steel slag into the high-temperature smelting furnace for steel making at high temperature.
The hydrogen metallurgy device of the utility model can replace the traditional long flow of blast furnace-converter for steel smelting, and the device of the utility model needs two units of hydrogen reduction and high temperature smelting furnace steel making, so the process can greatly reduce the production procedures and the production cost; the process uses hydrogen as a reducing agent, the product after reaction is water, and SO is not generated in the smelting process2Discharging; iron-smelting uses coke, buggy etc. to smelt among the prior art, can carburize in the iron, and the steelmaking process is again at the decarbonization process, the utility model discloses use hydrogen reduction iron ore, can not bring into carbon, so the steelmaking process also need not the decarbonization, consequently this technology is the green smelting technology of a very environmental protection.
The utility model discloses the energy structure of current steel smelting flow has been changed, the utility model discloses a pure hydrogen is smelted the iron ore, and the basic water that produces can not discharge carbon dioxide to can cyclic utilization, not have flue gas desulfurization denitration problem, also not have the solid waste emission problem.
In the traditional process, impurities in coke and coal powder can enter iron, particularly sulfur; the process of the utility model does not use carbonaceous energy, and does not bring in the problem of impurities caused by the carbonaceous energy, thereby being more beneficial to smelting pure steel, and the smelted pure molten steel has higher use value.
The traditional iron-making process comprises at least three processes of coking, sintering, blast furnace and the like, but the iron-making process of the utility model only comprises 1 process, the equipment quantity is reduced by more than 50 percent, the personnel number is reduced by more than 70 percent, and the smelting process is shorter; and the process is a very environment-friendly green smelting process, and the production cost of the utility model is lower in consideration of comprehensive conditions such as environmental protection treatment and the like.
Example one
The top of a hydrogen reduction furnace 1 which produces 30 ten thousand tons of direct reduced iron every year feeds pellets into the furnace through a feeding system 14, the hourly feeding amount is 52.5t/h, the iron grade (the total iron content of the pellets) of the pellets is 66 percent, and gas in the furnace is not discharged through the feeding system in the feeding process; the discharge amount of the directly reduced iron of a discharging system at the bottom of the hydrogen reduction furnace 1 is 37.5t/h, the metallization rate of the directly reduced iron is 93%, the temperature is 350 ℃, and the gas in the furnace is not discharged through the discharging system in the discharging process; the middle part and the lower part of the furnace body of the hydrogen reduction furnace 1 are respectively filled with hydrogen.
The hydrogen produced by the water hydrogen production system 5 passes through the third hydrogen compressor 8 on one way, the pressure reaches 0.5Mpa after pressurization, then the hydrogen is mixed with the circulating hydrogen of the first hydrogen compressor 4, enters the preheater 10 and is preheated to 400 ℃, then enters the heater 9 and is heated to 950 ℃, the pressure entering the furnace body from the middle part of the furnace body of the hydrogen reduction furnace 1 is 0.4Mpa, and the purity of the hydrogen is 98%; after the other path of hydrogen produced by the water hydrogen production system 5 passes through a second hydrogen compressor 6 and an adjusting valve group 7, the pressure entering the furnace body from the lower part of the furnace body of the hydrogen reduction furnace 1 reaches 0.55Mpa, the temperature of the hydrogen is 10 ℃, and the purity of the hydrogen is 98%.
In the gas discharged from the top of the furnace body of the hydrogen reduction furnace 1, the hydrogen accounts for 80% of the volume of the discharged gas, the rest is mainly steam, the gas temperature is 400 ℃, the gas passes through the coal gas purifier 2 and the first dehydrator 3, and the water separated by the first dehydrator 3 directly returns to the water hydrogen production system 5 for recycling; the hydrogen separated by the first dehydrator 3 is divided into two parts, the first part (accounting for 90% of the volume of the total hydrogen discharged from the top of the furnace) passes through the hydrogen compressor 4 and is mixed with the hydrogen passing through the compressor 8 to enter the preheater 10, and the second part (accounting for 10% of the volume of the total hydrogen discharged from the top of the furnace) is used as fuel gas and is preheated to 200 ℃ by the preheater 10, and then enters the heater 9 to be combusted.
The air blower 13 heats the air to 200 ℃ through the preheater 10, then enters the heater 9, and is combusted with the second part of hydrogen separated from the first dehydrator 3, the high-temperature flue gas generated after combustion is discharged from the heater 9 and enters the preheater 10, the temperature of the flue gas discharged through the preheater 10 is 200 ℃, the flue gas passes through the second dehydrator 11 and condenses the water vapor therein, the obtained water is circulated to the water hydrogen production system 5, and the rest flue gas is discharged from the chimney 12, and the main components of the flue gas are nitrogen and a small amount of water vapor.
The direct reduced iron discharged from the bottom of the hydrogen reduction furnace 1 is conveyed to a high-temperature smelting furnace 16 through a sealing conveying device 15, the sealing conveying device 15 has the functions of conveying the direct reduced iron, preserving heat and preventing oxidation, a heat preservation refractory material is lined in a sealed shell, and meanwhile, nitrogen is introduced into the sealed shell.
The high-temperature smelting furnace 16 is an electric arc furnace, and has the purpose of melting direct reduced iron and producing pure molten steel, the high-temperature smelting furnace 16 is respectively provided with an auxiliary material adding system 17 and a circulating steel slag feeding port, and pure molten steel 18 and steel-making slag are obtained after steel making is carried out by the high-temperature smelting furnace 16, wherein the content (mass fraction) of sulfur in the pure molten steel 18 is less than 0.0001%, and the content (mass fraction) of phosphorus is less than 0.01%; high-temperature liquid steel-making slag (the phosphorus content in the steel-making slag is 2.2%) directly enters a steel slag modification furnace 19 for modification, the steel slag modification furnace 19 is an electric furnace, after the steel-making slag is poured into the steel slag modification furnace 19, a steel slag modifier 20 is added into the furnace to realize dephosphorization of the steel slag, new steel slag after dephosphorization can be recycled to the high-temperature smelting furnace 16 through a circulating steel slag feed inlet for use, the phosphorus content in the new steel slag is 0.21%, and a phosphorus-containing byproduct 21 obtained by dephosphorization can be used as a raw material for preparing ferrophosphorus.
Example 2
The top of a hydrogen reduction furnace 1 which produces 80 ten thousand tons of direct reduced iron every year feeds pellet ore into the furnace through a feeding system 14, the hourly feeding amount is 140t/h, the iron grade of the pellet ore is 66.2 percent, and gas in the furnace is not discharged through the feeding system in the feeding process; the discharge amount of the directly reduced iron of the discharge system at the bottom of the hydrogen reduction furnace 1 is 100t/h, the discharge temperature is 210 ℃, the metallization rate of the directly reduced iron is 95%, and the gas in the furnace is not discharged through the discharge system in the discharge process; the middle part and the lower part of the furnace body of the hydrogen reduction furnace 1 are respectively filled with hydrogen.
The hydrogen produced by the water hydrogen production system 5 passes through the third hydrogen compressor 8 on one way, the pressure reaches 0.8Mpa after pressurization, then the hydrogen is mixed with the circulating hydrogen of the first hydrogen compressor 4, enters the preheater 10 and is preheated to 400 ℃, then enters the heater 9 and is heated to 950 ℃, the pressure entering the furnace body from the middle part of the furnace body of the hydrogen reduction furnace 1 is 0.7Mpa, and the purity of the hydrogen is 99%; after the other path of hydrogen produced by the water hydrogen production system 5 passes through a compressor 6 and an adjusting valve group 7, the pressure entering the furnace body from the lower part of the furnace body of the hydrogen reduction furnace 1 reaches 0.8Mpa, the temperature of the hydrogen is 8 ℃, and the purity of the hydrogen is 99%.
In the gas discharged from the top of the furnace body of the hydrogen reduction furnace 1, the volume of the hydrogen is 78 percent, the rest is mainly steam, the temperature of the gas is 380 ℃, the gas passes through the coal gas purifier 2 and the first dehydrator 3, and the water separated by the first dehydrator 3 is directly returned to the water hydrogen production system 5 for recycling; the hydrogen separated by the first dehydrator 3 is divided into two parts, the first part (accounting for 86% of the volume of the total amount of the hydrogen discharged from the top of the furnace) passes through the first hydrogen compressor 4 and is mixed with the hydrogen passing through the third hydrogen compressor 8 to enter the preheater 10, and the second part (accounting for 14% of the volume of the total amount of the hydrogen discharged from the top of the furnace) is used as fuel gas and is preheated to 210 ℃ by the preheater 10, and then enters the heater 9 to be combusted.
The air blower 13 heats the air to 250 ℃ through the preheater 10, then enters the heater 9, and is combusted with the second part of hydrogen separated from the dehydrator 3, the high-temperature flue gas generated after combustion is discharged from the heater 9 and enters the preheater 10, the temperature of the flue gas discharged through the preheater 10 is 150 ℃, the flue gas is condensed with the water vapor in the flue gas after passing through the second dehydrator 11, the obtained water is circulated to the water hydrogen production system 5, and the rest flue gas is discharged from the chimney 12, wherein the main components of the flue gas are nitrogen and a small amount of water vapor.
The direct reduced iron discharged from the bottom of the hydrogen reduction furnace 1 is conveyed to a high-temperature smelting furnace 16 through a sealing conveying device 15, the sealing conveying device 15 has the functions of conveying the direct reduced iron, preserving heat and preventing oxidation, a heat preservation refractory material is lined in a sealed shell, and meanwhile, argon is introduced into the sealed shell.
The high-temperature smelting furnace 16 is an electric arc furnace and achieves the purpose of melting direct reduced iron and producing pure molten steel, the high-temperature smelting furnace 16 is respectively provided with an auxiliary material adding system 17 and a circulating steel slag feeding port, the pure molten steel 18 and smelting steel slag are obtained after steel making is carried out by the high-temperature smelting furnace 16, the sulfur content in the pure molten steel 18 is less than 0.0001%, the phosphorus content is less than 0.005%, high-temperature liquid steel-making slag (the phosphorus content in the steel slag is 2.6%) directly enters the steel slag modifying furnace 19 for modifying, the steel slag modifying furnace 19 is an electric furnace, after the steel-making slag is poured into the steel slag modifying furnace 19, a steel slag modifying agent 20 is added into the furnace to realize dephosphorization of the steel slag, the dephosphorized new steel slag can be recycled to the high-temperature smelting furnace 16 for use, the phosphorus content in the new steel slag is 0.16%, and a phosphorus-.
Compared with the prior art, the utility model provides a hydrogen metallurgy device can solve the problem that traditional technology process is long, gaseous pollutant is big, solid useless emission is big, is applicable to the green metallurgical application of new generation.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention.
Claims (10)
1. A hydrogen metallurgical device is characterized by comprising a hydrogen reducing furnace (1), a gas supply and circulation system and a high-temperature smelting furnace (16);
the gas supply and circulation system comprises a water-hydrogen production system (5), a second hydrogen compressor (6), a regulating valve group (7), a third hydrogen compressor (8), a heater (9) and a preheater (10);
the water hydrogen production system (5), the third hydrogen compressor (8), the preheater (10) and the heater (9) are sequentially connected, and the heater (9) is connected with the middle part of the hydrogen reduction furnace (1);
the water hydrogen production system (5), the second hydrogen compressor (6) and the regulating valve group (7) are sequentially connected, and the regulating valve group (7) is connected with the lower part of the hydrogen reduction furnace (1);
the hydrogen reduction furnace (1) is used for reducing iron ore raw materials into direct reduced iron by adopting hydrogen; the gas supply and circulation system is connected with the hydrogen reduction furnace (1) and is used for supplying hydrogen to the hydrogen reduction furnace (1); the high-temperature smelting furnace (16) is used for smelting the direct reduced iron.
2. The hydrometallurgical apparatus according to claim 1, further comprising a charging system (14) for charging iron ore raw material into the furnace from a top of the hydrogen reducing furnace (1).
3. The hydrometallurgical plant according to claim 2, characterized in that the feeding system (14) comprises an upper tank and a lower tank connected in series, the upper tank being provided with an upper valve, an intermediate valve being provided between the upper tank and the lower tank, and the lower tank being provided with a lower valve.
4. The hydrometallurgical plant of claim 1, wherein the gas supply and circulation system further comprises a gas purifier (2), a first water separator (3) and a first hydrogen compressor (4);
the top of the hydrogen reduction furnace (1), the coal gas purifier (2), the first dehydrator (3), the first hydrogen compressor (4) and the preheater (10) are connected in sequence; the first dehydrator (3) is also connected with a water hydrogen production system (5).
5. The hydrometallurgical plant according to claim 4, characterized in that the gas supply and circulation system further comprises a blower (13), the blower (13) being used for passing air into the preheater (10).
6. The hydrometallurgical plant of claim 5, characterized in that the gas supply and circulation system further comprises a second water separator (11) and a stack (12);
one end of the second dehydrator (11) is connected with the preheater (10), and the other end of the second dehydrator is connected with the water hydrogen production system (5); the chimney (12) is connected with the second dehydrator (11).
7. The hydrometallurgical plant of claim 1, further comprising a steel slag upgrading furnace (19) for upgrading high temperature liquid steel-making slag discharged from the pyrometallurgical furnace (16).
8. The hydrometallurgical plant according to any of the claims 1-7, characterized in that the pyrometallurgical furnace (16) is provided with an auxiliary material addition system (17) and a circulating steel slag feed opening.
9. A hydrometallurgical plant according to any one of claims 1-7, characterized in that a first heat exchanger tube, a second heat exchanger tube and a third heat exchanger tube are arranged in the preheater (10) for preheating air, hydrogen for combustion and hydrogen to be fed to the middle of the hydrogen reduction furnace (1), respectively.
10. The hydrometallurgical plant of claim 9, characterized in that the preheater (10) has a low temperature preheating section and a high temperature preheating section, the first and second heat exchange tubes being in the low temperature preheating section and the third heat exchange tube being in the high temperature preheating section.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020642881.8U CN212293639U (en) | 2020-04-23 | 2020-04-23 | Hydrogen metallurgy device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020642881.8U CN212293639U (en) | 2020-04-23 | 2020-04-23 | Hydrogen metallurgy device |
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| CN212293639U true CN212293639U (en) | 2021-01-05 |
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| CN (1) | CN212293639U (en) |
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