CN103667573A - Short-flow process for producing direct reduction iron with assistance of coke oven gas - Google Patents
Short-flow process for producing direct reduction iron with assistance of coke oven gas Download PDFInfo
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Abstract
The invention discloses a short-flow process for producing direct reduction iron with the assistance of coke oven gas. The process is characterized in that the coke oven gas is adopted for providing hydrogen resources for direct reduction iron production, the direct reduction iron is produced in a gas base shaft furnace, a direct reduction iron production device consists of a cooling loop, a reduction gas loop and a reaction tower, and the direct reduction iron is produced in the reaction tower. The upper part of the reaction tower is provided with a reduction section, the lower part of the reaction tower is provided with a cooling section, and oxidized pellets enter the top of the reaction tower through a feeding system, move downwards under the gravity action, are preheated in the reduction section and are subjected to a reduction reaction with reduction gas, so that the direct reduction iron is produced. The oxidized pellets are cooled to normal temperature in the cooling section by cooling gas and then are discharged, and the cold direct reduction iron is obtained. According to the invention, natural gas is replaced by the high-chemical-energy coke oven gas, the direct reduction iron is produced in the gas base shaft furnace, the requirement of electric furnace steelmaking is met, the energy consumption in the whole steelmaking process is reduced, the production cost is reduced, the carbon dioxide emission is reduced, and the green steel process is promoted.
Description
Technical field
The invention belongs to smelting iron and steel technical field, particularly a kind of Direct Reduction Iron Produced by Coke Oven Gas abbreviated system of using.
Background technology
At present, the domestic industry of smelting iron and steel is in the prior art mainly to take blast furnace ironmaking as main, but blast furnace ironmaking exists the problems such as cost is high, efficiency is low, seriously polluted.In western developed country some developing country even, direct-reduction abbreviated system has progressively replaced blast furnace to become the main production model of smelting iron and steel.Focus on global direct-reduced iron and produce, the core technology of american steel is very ripe, and wherein the short flow process technology of direct-reduction Electric furnace steel making, maintains the leading position in the world.The U.S. produces 9000 ten thousand tons of left and right of steel per year, with the steel that direct-reduction abbreviated system is produced, accounts for half of the country.United States Steel Corporation is the Iron And Steel Company of U.S.'s maximum, and long-term production is in loss of capital edge, and it competes failed major reason is to continue to use the long flow process of tradition, and does not utilize gas resource to produce direct-reduced iron, short flow process steel-making.India's iron and steel industry development is started late, but tempo is very fast, has benefited from being widely used the short flow process mode of production of direct-reduction.It is reported, India produces 7000 ten thousand tons of left and right of steel at present per year, and direct-reduced iron output is 3,500 ten thousand tons of left and right.The direct-reduced iron of 80-90% adds in electric arc furnace or induction furnace makes steel, and direct-reduction abbreviated system becomes the steel mainstream technology of India.United Arab Emirates Abu Dhabi Steel Plant, adopt ENERGIRON abbreviated system, build two cover direct-reduced iron devices, produce 3200000 tons of direct-reduced irons per year, 100% direct-reduced iron Electric furnace steel making, has formed 3,000,000 tons short flow process associating Steel Plant, plans to build for 2014 the short flow path device of two cover direct-reductions again, crude steel output reaches 6,500,000 tons, for upgrading transition of world steel industry creates new pattern.Abu Dhabi Steel Plant are by DANIELI over contract, and bag is built, and by the short flow process technology of ENERGIRON, push to all over the world, the Qi Ge producer that accepted and order for goods, and device aggregated capacity reaches 12,150 ten thousand tons, and Bing Weige manufacturer provides technical support and technical guarantee.The integration of ENERGIRON technology and Electric furnace steel making, energy-conservation for iron and steel industry, reduce discharging, reduce production costs, industrialness production experience is provided; For iron and steel industry upgrading transition, provide new approach.Ten thousand tons of left and right of Malaysia crude steel annual production 300-350, because the western horse of eastern horse (Sarawak) (East Coast) is abounded with Sweet natural gas, use gas-based shaft kiln directly reduced abbreviated system, produce nearly 2,000,000 tons of direct-reduced iron per year, and obtain the effect of energy-conservation, reduction of discharging, environmental protection.Malaysia Ding Jianu state POWAJA section steel works, the original design 600,000 tons of short flow process of direct-reduction Steel Plant, through four transformation and upgrade of Mexico HYLSA company, direct-reduced iron annual production reaches 900,000 tons.Wei Duan flow process Steel Plant provide iron resources.By the anatomy of above-mentioned various countries Iron & Steel Development mode, to be not difficult to find out, the short flow process of direct-reduction Electric furnace steel making will become the mainstream technology of world steel future development, and gas-based shaft kiln directly reduced technology will become the main mode of production of direct-reduced iron production.But the shortage of Sweet natural gas becomes a major cause that hinders world's direct-reduced iron industrial development.
Summary of the invention
The present invention has overcome the defect of above-mentioned existence, and object is to have the problems such as cost is high, efficiency is low, seriously polluted for solving blast furnace ironmaking, and a kind of Direct Reduction Iron Produced by Coke Oven Gas abbreviated system of using is provided.
Direct Reduction Iron Produced by Coke Oven Gas abbreviated system content Description for the present invention:
The present invention's Direct Reduction Iron Produced by Coke Oven Gas abbreviated system, it is characterized in that: adopt coke-oven gas to produce hydrogen resource is provided for direct-reduced iron, in gas-based shaft kiln, produce direct-reduced iron, direct-reduced iron production equipment is by cooling loop, three parts of reducing gas loop and reaction tower form, finally in reaction tower, produce direct-reduced iron, the top of reaction tower is reduction section, bottom is cooling section, acid pellet enters reaction tower top by feeding system, under the effect of gravity, slowly move down, in reduction section preheating and with reducing gas, carry out reduction reaction, generate direct-reduced iron, at cooling section, with cooling gas, be cooled to normal temperature to discharge, obtain cold direct-reduced iron,
The direct-reduced iron technological process of production: adopt coke-oven gas heat treated, coke-oven gas and iron ore in gas-based shaft kiln from reforming reaction and reduction reaction, hot reduced iron cooling process and reduced iron is carried out to carburization reaction and reducing gas recycle and reuse, by four processing steps, realize;
(1) adopt coke-oven gas heat treated:
Coke-oven gas is sent into and in humidifier, added water vapour, the coke-oven gas that has merged water vapour is heated to 930 ℃ in well heater, methane gas in coke-oven gas heats rear generation carbon monoxide and hydrogen together with water, in its backward outlet conduit, spray into pure oxygen, carry out partial combustion, make coke-oven gas temperature bring up to 1050 ℃, reach the requirement from reforming reaction and reduction reaction temperature and heat balance, after enter gas-based shaft kiln middle part;
(2) coke-oven gas and iron ore in gas-based shaft kiln from reforming reaction and reduction reaction:
There are three kinds of reactions in the coke-oven gas after heating: from reforming reaction, reduction reaction and carburization reaction in gas-based shaft kiln, the top of gas-based shaft kiln is reduction section, bottom is cooling section, acid pellet enters gas-based shaft kiln by the feeding system at gas-based shaft kiln top, under the effect of gravity, slowly move down, enter the high temperature coke oven coal gas in gas-based shaft kiln, acid pellet is heated to 600 ℃-700 ℃, the coke-oven gas of high temperature is under the effect of iron catalyst simultaneously, there is thermo-cracking and from reforming reaction, produce reducing gas hydrogen and carbon monoxide, by the methane reforming in coke-oven gas, be hydrogen and carbon monoxide, be heated to acid pellet and the hydrogen of 600 ℃-700 ℃, reaction of carbon monoxide, deviate from the oxygen in pellet, produce high-quality direct-reduced iron,
(3) hot reduced iron cooling process reduced iron is carried out to carburization reaction:
The hot direct reduced iron generating after reacting with reducing gas enters cooling section and is cooled to normal temperature then to discharge with cooling gas, and the direct-reduced iron obtaining is called cold direct-reduced iron, at cooling section, use gas compressor then to enter cooling loop to supplementary coke-oven gas pressurization, the direct-reduced iron that circulating cooling is produced at gas-based shaft kiln reduction section, simultaneously by the hydrocarbon polymer cracking in coke-oven gas and reduced iron is carried out to carburization reaction, the coke-oven gas cold at cooling section can be heated in the process of cooling heat reduced iron, coke-oven gas is heated to 70 ℃, coke-oven gas after heating is directly sent into and in reducing gas compressor, carried out pressure treatment and then send into carbon dioxide recovering apparatus, reheat with sending in humidifier together with supplementary coke-oven gas simultaneously, then circulation enters gas-based shaft kiln, at cooling section, use gas cooler not carry out cooling process to reaching the coke-oven gas of temperature 70 C, after gas compressor pressurization, send into the cooling direct-reduced iron of gas-based shaft kiln,
(4) reducing gas recycle and reuse:
For cooling recycle gas, through pressurization, be fed in the reducing gas circuit system at gas-based shaft kiln top, the high-temperature reductibility gas at gas-based shaft kiln top in conversion zone under the effect of iron catalyst, hydrogen and carbon monoxide that methane reforming forms, react and generate carbonic acid gas and water with iron ore concentrate, the refrigeration cycle gas of sending into reaction tower top through pressurization is called top gas, top gas temperature at gas-based shaft kiln top is 427 ℃, top gas enters heat reclamation device from the eliminating of gas-based shaft kiln top and produces steam, refrigerated separation water outlet in top gas water cooler, the top gas of separated water outlet is sent into reducer compressor and is pressurizeed, reducer compressor need to be controlled the pressure of gas in whole technical process at 4-6 handkerchief, the top gas of pressurization is sent into decarbonation device, the top gas of carbon dioxide removal and water and supplementary coke-oven gas, and at cooling section, be warmed to the coke-oven gas of 70 ℃ and reheat in sending into together humidifier well heater, then circulation enters gas-based shaft kiln.
The abbreviated system that adopts Direct Reduction Iron Produced by Coke Oven Gas, raw materials for production are pellet and coke-oven gas, to the requirement of pellet, are: Fe 64-66%, SiO
2< 3%, intensity > 2800-3000 newton, low temperature reduction degradation index ﹤ 3%;
It is the coal gas after purifying treatment that coke-oven gas requires, its main component (% volume):
H
262%, CH
426%, CO 6%, CO
22%, N
22%, O
20.15%, CmHn 3-4%; Its foreign matter content is controlled index: benzene < 2000mg/Nm
3, naphthalene < 50mg/Nm
3, tar < 10mg/Nm
3, H
2s < 20mg/Nm
3, HCN < 200mg/Nm
3;
The direct-reduced iron quality index of producing: degree of metalization 94-96%, carbon content 4-6%.
The present invention's Direct Reduction Iron Produced by Coke Oven Gas abbreviated system, adopt coke-oven gas to produce hydrogen resource is provided for direct-reduced iron, with the coke-oven gas of high chemical energy, replace Sweet natural gas, in gas-based shaft kiln, produce qualified direct-reduced iron, meet the demand of Electric furnace steel making, reduce the full-range energy consumption of iron and steel, reduce production costs, reduce CO2 emissions, promote to realize the process of green iron and steel.
Accompanying drawing explanation
Fig. 1 is with Direct Reduction Iron Produced by Coke Oven Gas abbreviated system schema.
Embodiment
The present invention is achieved in that below in conjunction with accompanying drawing and illustrates by Direct Reduction Iron Produced by Coke Oven Gas abbreviated system.
The present invention is a kind of Direct Reduction Iron Produced by Coke Oven Gas abbreviated system of using, adopt coke-oven gas to produce hydrogen resource is provided for direct-reduced iron, in gas-based shaft kiln, produce direct-reduced iron, direct-reduced iron production equipment is by cooling loop, three parts of reducing gas loop and reaction tower form, finally in reaction tower, produce direct-reduced iron, the top of reaction tower is reduction section, bottom is cooling section, acid pellet enters reaction tower top by feeding system, under the effect of gravity, slowly move down, in reduction section preheating and with reducing gas, carry out reduction reaction, generate direct-reduced iron, at cooling section, with cooling gas, be cooled to normal temperature to discharge, obtain cold direct-reduced iron.
The direct-reduced iron technological process of production: adopt coke-oven gas heat treated, coke-oven gas and iron ore in gas-based shaft kiln from reforming reaction and reduction reaction, hot reduced iron cooling process and to reduced iron carry out carburization reaction, reducing gas recycle and reuse realizes by four processing steps;
(1) adopt coke-oven gas heat treated:
Coke-oven gas is sent into and in humidifier, added water vapour, the coke-oven gas that has merged water vapour is heated to 930 ℃ in well heater, methane gas in coke-oven gas heats rear generation carbon monoxide and hydrogen together with water, in its backward outlet conduit, spray into pure oxygen, carry out partial combustion, make coke-oven gas temperature bring up to 1050 ℃, reach the requirement from reforming reaction and reduction reaction temperature and heat balance, after enter gas-based shaft kiln middle part.
(2) coke-oven gas and iron ore in gas-based shaft kiln from reforming reaction and reduction reaction:
There are three kinds of reactions in the coke-oven gas after heating: from reforming reaction, reduction reaction and carburization reaction in gas-based shaft kiln; The top of gas-based shaft kiln is reduction section, bottom is cooling section, acid pellet enters gas-based shaft kiln by the feeding system at gas-based shaft kiln top, under the effect of gravity, slowly move down, enter the high temperature coke oven coal gas in gas-based shaft kiln, acid pellet is heated to 600 ℃-700 ℃, the coke-oven gas of high temperature is under the effect of iron catalyst simultaneously, there is thermo-cracking and from reforming reaction, produce reducing gas hydrogen and carbon monoxide (CH
4+ H
2o=CO+3H
2cH
4+ CO
2=2CO+2H
22CH
4+ O
2=2CO+4H
2o
2+ 2H
2=2H
2o CH
4=2CO+2H
2), in coke-oven gas, 30% contained methane reforming is 70% hydrogen and 30% carbon monoxide.Be heated to the acid pellet of 600 ℃-700 ℃ and hydrogen, reaction of carbon monoxide, deviate from the oxygen in pellet, produce high-quality direct-reduced iron (Fe
2o
3+ 3CO=2Fe
0+ 3CO
2fe
2o
3+ 3H
2=2Fe
0+ 3H
2o), the raw material of high-quality is provided for Electric furnace steel making.
(3) hot reduced iron cooling process reduced iron is carried out to carburization reaction:
The hot direct reduced iron generating after reacting with reducing gas enters cooling section and is cooled to normal temperature then to discharge with cooling gas, and the direct-reduced iron obtaining is called cold direct-reduced iron, at cooling section, use gas compressor then to enter cooling loop to supplementary coke-oven gas pressurization, the direct-reduced iron that circulating cooling is produced at gas-based shaft kiln reduction section, simultaneously by the hydrocarbon polymer cracking in coke-oven gas and reduced iron is carried out to carburization reaction (3Fe
0+ CH
4=Fe
3c+2H
23Fe+2CO=Fe3C+CO2), the coke-oven gas cold at cooling section can be heated in the process of cooling heat reduced iron, coke-oven gas is heated to 70 ℃, coke-oven gas after heating is directly sent into and in reducing gas compressor, carried out pressure treatment and then send into carbon dioxide recovering apparatus, reheat with sending in humidifier together with supplementary coke-oven gas simultaneously, then circulation enters gas-based shaft kiln, be heated to 70 ℃ and must than the normal temperature coke-oven gas that enters into process furnace, more can reach energy-conservation effect by coke-oven gas, at cooling section, use gas cooler not carry out cooling process to reaching the coke-oven gas of temperature 70 C, after gas compressor pressurization, send into the cooling direct-reduced iron of gas-based shaft kiln, .
(4) reducing gas recycle and reuse:
For cooling recycle gas, through pressurization, be fed in the reducing gas circuit system at gas-based shaft kiln top, the reducing gas that the gas now mainly existing at gas-based shaft kiln top has high temperature in conversion zone under the effect of iron catalyst, hydrogen and carbon monoxide that methane reforming forms, react and generate carbonic acid gas and water with iron ore concentrate, through pressurization, send into the refrigeration cycle gas at reaction tower top, these gases are referred to as top gas, now the top gas temperature at gas-based shaft kiln top is 427 ℃, top gas enters heat reclamation device from the eliminating of gas-based shaft kiln top and produces steam, refrigerated separation water outlet in top gas water cooler, the top gas of separated water outlet is sent into reducer compressor and is pressurizeed, reducer compressor need to be controlled the pressure of gas in whole technical process at 4-6 handkerchief, the top gas that adds overvoltage is sent into decarbonation device, together with the top gas of carbon dioxide removal and water and supplementary coke-oven gas and the coke-oven gas that is warmed to 70 ℃ at cooling section, send in humidifier well heater and reheat, then circulation enters gas-based shaft kiln.
Adopt Direct Reduction Iron Produced by Coke Oven Gas abbreviated system, raw materials for production are pellet and coke-oven gas, to the requirement of pellet, are: Fe 64-66%, SiO
2< 3%, intensity > 2800-3000 newton, low temperature reduction degradation index ﹤ 3%;
It is the coal gas after purifying treatment that coke-oven gas requires, its main component (% volume):
H
262%, CH
426%, CO 6%, CO
22%, N
22%, O
20.15%, CmHn 3-4%; Its foreign matter content is controlled index: benzene < 2000mg/Nm
3, naphthalene < 50mg/Nm
3, tar < 10mg/Nm
3, H
2s < 20mg/Nm
3, HCN < 200mg/Nm
3;
The direct-reduced iron quality index of producing: degree of metalization 94-96%, carbon content 4-6%.
Carbon under carburizing reflection effect in direct-reduced iron mainly exists with the form of iron carbide, in the more than 3% high-carbon direct-reduced iron of carbon containing, there are 70% iron and carbon to be combined into iron carbide, iron carbide after over carburizing reflection can strengthen the stability of direct-reduced iron and the activity of steel-making, is conducive to transportation and the steel-making operation of product.
Embodiment:
Adopt the present invention to produce direct-reduced iron by Direct Reduction Iron Produced by Coke Oven Gas abbreviated system, overtesting and detection proof:
The raw material of producing is pellet and coke-oven gas, is: Fe 64-66%, SiO to the requirement of pellet
2< 3%, intensity > 2800-3000 newton, low temperature reduction degradation index < 3%.
It is the coal gas after purifying treatment that coke-oven gas requires, its main component (% volume):
H
262%, CH
426%, CO 6%, CO
22%, N
22%, O
20.15%, CmHn 3-4%; Its foreign matter content is controlled index: benzene < 2000mg/Nm
3, naphthalene < 50mg/Nm
3, tar < 10mg/Nm
3, H
2s < 20mg/Nm
3, HCN < 200mg/Nm
3.
The direct-reduced iron quality index of producing: degree of metalization 94-96%, carbon content 4-6%.
Adopt the present invention to produce direct-reduced iron by the short flow process novel process of Direct Reduction Iron Produced by Coke Oven Gas Electric furnace steel making, main raw materials and fuel consumption and ton direct-reduced iron cost are as follows:
| Project | Unit consumption (unit: ton direct-reduced iron) |
| Pellet | 1.39 ton |
| Coke-oven gas | 560 Nm 3/ ton |
| Electric power | 102 kW/h |
| Oxygen | 19 Nm 3 |
| Nitrogen | 9.5 Nm 3 |
| Water | 1.4 ton |
| Production cost | 1853.16 yuan/ton |
The main reductive agent of blast furnace iron is coke, ton blast furnace 0.5 ton, coke of iron loss (comprising injection coal), and ton coke price is 2200 yuan, ton blast furnace iron loss coke expense is 1100 yuan.Ton direct-reduction iron loss coke-oven gas 560Nm
3, every cubic metre of coke-oven gas is by monobasic, and ton direct-reduced iron is 560 yuan, and the difference of two kinds of iron product consumption reductive agent (being commonly referred to as fuel) expenses is 1100-560=540 yuan.If by producing 500000 tons of iron products per year, it is 500,000 * 540 yuan=2.70 hundred million yuan that year can be ironworks cost saving.
Direct-reduced iron can replace steel scrap (ton direct-reduced iron=ton steel scrap), and ton direct-reduced iron cost price is 1853.16 yuan, and steel scrap market price is 2226.67 yuan, and price difference is 373.51 yuan.By producing 500000 tons of direct-reduced irons per year, it is 500,000 * 373.51=1.86 hundred million yuan that year makes profits.
Direct reduction iron making be hydrogen metallurgy in the application of iron-smelting process, hydrogen reduction primitive reaction formula is Fe
2o
3+ 3H
2=3Fe+H
2o.As can be seen here, the metallurgical the finished product of hydrogen are water rather than CO
2, from theoretical, say CO
2discharge is zero.According to production statistic data, show, direct reduction iron making is than blast furnace ironmaking CO
2discharge reduces 38%, and this is that low-carbon (LC) ironmaking is expected, is that green iron and steel is necessary, and the social benefit of its creation is considerable.
Direct-reduced iron is pure iron, and S content is below 0.002, and P content is below 0.002, for electrosmelting Clean Steel creates conditions; For steel mill's production high added value steel, improve steel product quality and create favorable conditions, increase the benefit of steel mill.
Claims (2)
1. use Direct Reduction Iron Produced by Coke Oven Gas abbreviated system for one kind, it is characterized in that: adopt coke-oven gas to produce hydrogen resource is provided for direct-reduced iron, in gas-based shaft kiln, produce direct-reduced iron, direct-reduced iron production equipment is by cooling loop, three parts of reducing gas loop and reaction tower form, finally in reaction tower, produce direct-reduced iron, the top of reaction tower is reduction section, bottom is cooling section, acid pellet enters reaction tower top by feeding system, under the effect of gravity, slowly move down, in reduction section preheating and with reducing gas, carry out reduction reaction, generate direct-reduced iron, at cooling section, with cooling gas, be cooled to normal temperature to discharge, obtain cold direct-reduced iron,
The direct-reduced iron technological process of production: adopt coke-oven gas heat treated, coke-oven gas and iron ore in gas-based shaft kiln from reforming reaction and reduction reaction, hot reduced iron cooling process and reduced iron is carried out to carburization reaction and reducing gas recycle and reuse, by four processing steps, realize;
(1) adopt coke-oven gas heat treated:
Coke-oven gas is sent into and in humidifier, added water vapour, the coke-oven gas that has merged water vapour is heated to 930 ℃ in well heater, methane gas in coke-oven gas heats rear generation carbon monoxide and hydrogen together with water, in its backward outlet conduit, spray into pure oxygen, carry out partial combustion, make coke-oven gas temperature bring up to 1050 ℃, reach the requirement from reforming reaction and reduction reaction temperature and heat balance, after enter gas-based shaft kiln middle part;
(2) coke-oven gas and iron ore in gas-based shaft kiln from reforming reaction and reduction reaction:
There are three kinds of reactions in the coke-oven gas after heating: from reforming reaction, reduction reaction and carburization reaction in gas-based shaft kiln, the top of gas-based shaft kiln is reduction section, bottom is cooling section, acid pellet enters gas-based shaft kiln by the feeding system at gas-based shaft kiln top, under the effect of gravity, slowly move down, enter the high temperature coke oven coal gas in gas-based shaft kiln, acid pellet is heated to 600 ℃-700 ℃, the coke-oven gas of high temperature is under the effect of iron catalyst simultaneously, there is thermo-cracking and from reforming reaction, produce reducing gas hydrogen and carbon monoxide, by the methane reforming in coke-oven gas, be hydrogen and carbon monoxide, be heated to acid pellet and the hydrogen of 600 ℃-700 ℃, reaction of carbon monoxide, deviate from the oxygen in pellet, produce high-quality direct-reduced iron,
(3) hot reduced iron cooling process reduced iron is carried out to carburization reaction:
The hot direct reduced iron generating after reacting with reducing gas enters cooling section and is cooled to normal temperature then to discharge with cooling gas, and the direct-reduced iron obtaining is called cold direct-reduced iron, at cooling section, use gas compressor then to enter cooling loop to supplementary coke-oven gas pressurization, the direct-reduced iron that circulating cooling is produced at gas-based shaft kiln reduction section, simultaneously by the hydrocarbon polymer cracking in coke-oven gas and reduced iron is carried out to carburization reaction, the coke-oven gas cold at cooling section can be heated in the process of cooling heat reduced iron, coke-oven gas is heated to 70 ℃, coke-oven gas after heating is directly sent into and in reducing gas compressor, carried out pressure treatment and then send into carbon dioxide recovering apparatus, reheat with sending in humidifier together with supplementary coke-oven gas simultaneously, then circulation enters gas-based shaft kiln, at cooling section, use gas cooler not carry out cooling process to reaching the coke-oven gas of temperature 70 C, after gas compressor pressurization, send into the cooling direct-reduced iron of gas-based shaft kiln,
(4) reducing gas recycle and reuse:
For cooling recycle gas, through pressurization, be fed in the reducing gas circuit system at gas-based shaft kiln top, the high-temperature reductibility gas at gas-based shaft kiln top in conversion zone under the effect of iron catalyst, hydrogen and carbon monoxide that methane reforming forms, react and generate carbonic acid gas and water with iron ore concentrate, the refrigeration cycle gas of sending into reaction tower top through pressurization is called top gas, top gas temperature at gas-based shaft kiln top is 427 ℃, top gas enters heat reclamation device from the eliminating of gas-based shaft kiln top and produces steam, refrigerated separation water outlet in top gas water cooler, the top gas of separated water outlet is sent into reducer compressor and is pressurizeed, reducer compressor need to be controlled the pressure of gas in whole technical process at 4-6 handkerchief, the top gas of pressurization is sent into decarbonation device, the top gas of carbon dioxide removal and water and supplementary coke-oven gas, and at cooling section, be warmed to the coke-oven gas of 70 ℃ and reheat in sending into together humidifier well heater, then circulation enters gas-based shaft kiln.
2. the Direct Reduction Iron Produced by Coke Oven Gas abbreviated system of using according to claim 1, is characterized in that: raw materials for production are pellet and coke-oven gas, to the requirement of pellet, are: Fe 64-66%, SiO
2< 3%, intensity > 2800-3000 newton, low temperature reduction degradation index ﹤ 3%;
It is the coal gas after purifying treatment that coke-oven gas requires, its main component (% volume):
H
262%, CH
426%, CO 6%, CO
22%, N
22%, O
20.15%, CmHn 3-4%; Its foreign matter content is controlled index: benzene < 2000mg/Nm
3, naphthalene < 50mg/Nm
3, tar < 10mg/Nm
3, H
2s < 20mg/Nm
3, HCN < 200mg/Nm
3;
The direct-reduced iron quality index of producing: degree of metalization 94-96%, carbon content 4-6%.
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN104087700A (en) * | 2014-07-18 | 2014-10-08 | 北京神雾环境能源科技集团股份有限公司 | Method and system for preparing sponge iron by using gas-based shaft furnace |
| CN104087699A (en) * | 2014-07-18 | 2014-10-08 | 北京神雾环境能源科技集团股份有限公司 | Method and system for preparing sponge iron by using gas-based shaft furnace |
| CN104384520A (en) * | 2014-11-24 | 2015-03-04 | 中冶北方（大连）工程技术有限公司 | Process for producing direct reduced iron powder by using coke oven gas for reducing titanic magnetite tailings |
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| CN104451017A (en) * | 2014-11-28 | 2015-03-25 | 中冶赛迪工程技术股份有限公司 | Carburizing process for vanadium titano-magnetite direct reduced iron through shaft furnace |
| CN106191360A (en) * | 2015-04-29 | 2016-12-07 | 北京神雾环境能源科技集团股份有限公司 | A kind of method of quenched reduction shaft furnace gas |
| CN106702065A (en) * | 2016-12-20 | 2017-05-24 | 江苏省冶金设计院有限公司 | Novel system and novel method for preparing sponge iron through gas-based shaft kiln |
| CN106755692A (en) * | 2017-03-03 | 2017-05-31 | 江苏省冶金设计院有限公司 | The system and method that laterite nickel ore pellet is reduced after gas water steam reformation |
| CN106957937A (en) * | 2017-04-20 | 2017-07-18 | 江苏省冶金设计院有限公司 | A kind of method and system of use COREX devices and direct-reduction shaft furnace production sponge iron |
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| CN114945688A (en) * | 2019-11-14 | 2022-08-26 | 达涅利机械设备股份公司 | Method for producing iron by direct reduction of iron ore and corresponding plant |
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| CN104046714B (en) * | 2014-06-13 | 2016-03-02 | 江苏大学 | A kind of reduction reaction shaft furnace waste heat recovery cyclic utilization system |
| CN104046714A (en) * | 2014-06-13 | 2014-09-17 | 江苏大学 | System for recovering and recycling waste heat of reduction reaction vertical furnace |
| CN104087700A (en) * | 2014-07-18 | 2014-10-08 | 北京神雾环境能源科技集团股份有限公司 | Method and system for preparing sponge iron by using gas-based shaft furnace |
| CN104087699A (en) * | 2014-07-18 | 2014-10-08 | 北京神雾环境能源科技集团股份有限公司 | Method and system for preparing sponge iron by using gas-based shaft furnace |
| CN104087700B (en) * | 2014-07-18 | 2017-05-03 | 北京神雾环境能源科技集团股份有限公司 | Method and system for preparing sponge iron by using gas-based shaft furnace |
| CN104087699B (en) * | 2014-07-18 | 2017-05-03 | 北京神雾环境能源科技集团股份有限公司 | Method and system for preparing sponge iron by using gas-based shaft furnace |
| CN104384520A (en) * | 2014-11-24 | 2015-03-04 | 中冶北方（大连）工程技术有限公司 | Process for producing direct reduced iron powder by using coke oven gas for reducing titanic magnetite tailings |
| CN104451017A (en) * | 2014-11-28 | 2015-03-25 | 中冶赛迪工程技术股份有限公司 | Carburizing process for vanadium titano-magnetite direct reduced iron through shaft furnace |
| CN104451163A (en) * | 2014-12-15 | 2015-03-25 | 湖南省加嘉锑业科技有限公司 | Heavy metal treatment device |
| CN106191360A (en) * | 2015-04-29 | 2016-12-07 | 北京神雾环境能源科技集团股份有限公司 | A kind of method of quenched reduction shaft furnace gas |
| CN108884503A (en) * | 2016-02-02 | 2018-11-23 | 博格丹·福来提克 | Method and apparatus for producing sponge iron |
| CN108884503B (en) * | 2016-02-02 | 2020-11-06 | 博格丹·福来提克 | Method and apparatus for producing sponge iron |
| CN106702065A (en) * | 2016-12-20 | 2017-05-24 | 江苏省冶金设计院有限公司 | Novel system and novel method for preparing sponge iron through gas-based shaft kiln |
| CN106755692A (en) * | 2017-03-03 | 2017-05-31 | 江苏省冶金设计院有限公司 | The system and method that laterite nickel ore pellet is reduced after gas water steam reformation |
| CN106957937A (en) * | 2017-04-20 | 2017-07-18 | 江苏省冶金设计院有限公司 | A kind of method and system of use COREX devices and direct-reduction shaft furnace production sponge iron |
| CN114945688A (en) * | 2019-11-14 | 2022-08-26 | 达涅利机械设备股份公司 | Method for producing iron by direct reduction of iron ore and corresponding plant |
| CN115094180A (en) * | 2022-06-23 | 2022-09-23 | 中冶赛迪技术研究中心有限公司 | Low-carbon rotary hearth furnace and using method thereof |
| CN115074477A (en) * | 2022-06-27 | 2022-09-20 | 盐城市联鑫钢铁有限公司 | Short-process low-carbon smelting process for high-quality steel |
| CN115449579A (en) * | 2022-08-23 | 2022-12-09 | 攀钢集团西昌钢钒有限公司 | Low-carbon smelting reduction iron-making method and device |
| CN115449579B (en) * | 2022-08-23 | 2023-12-19 | 攀钢集团西昌钢钒有限公司 | Low-carbon smelting reduction iron-making method and device |
| CN115449580A (en) * | 2022-08-31 | 2022-12-09 | 河北张宣高科科技有限公司 | Zero-carbon-emission direct reduction system and process completely adopting coke oven gas |
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