CN103898265B - A kind of coke-oven gas upgrading direct-reduction iron ore system and device and method - Google Patents
A kind of coke-oven gas upgrading direct-reduction iron ore system and device and method Download PDFInfo
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- CN103898265B CN103898265B CN201410088900.6A CN201410088900A CN103898265B CN 103898265 B CN103898265 B CN 103898265B CN 201410088900 A CN201410088900 A CN 201410088900A CN 103898265 B CN103898265 B CN 103898265B
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Abstract
The present invention relates to a kind of system and device and method of coke-oven gas upgrading direct-reduction iron ore, belong to non-blast furnace ironmaking Technology field.The present invention proposes a novel process, utilizes the coke-oven gas that process of coking produces, and is transformed by its upgrading and makes rich hydrogen reduction gas (H
2and CO), be then introduced into shaft kiln directly reduced iron ore.The present invention can provide a large amount of rich hydrogen reduction gas needed for direct-reduced iron technology, the rich hydrogen reduction gas of upgrading gained is used for the direct-reduction of iron ore, effectively can reduce the Carbon emission in reduction of iron ore process, the route carrying out direct-reduced iron from Sweet natural gas is completely different, is suitable for the Energy resources feature of China.
Description
Technical field
The present invention relates to a kind of system and device and method of coke-oven gas upgrading direct-reduction iron ore, belong to non-blast furnace ironmaking Technology field.
Background technology
Along with the fast development of world economy, the increasing substantially of scientific and technological level, mankind's nature remodeling, the scale of natural resources is utilized unprecedentedly to expand, the resource obtained from physical environment also gets more and more, the pollutent of meanwhile discharging also grows with each passing day, thus has caused the pollution of environment and the problem such as the destruction of ecotope and energy resource shortage.Current threat human survival and by human knowledge to environmental problem mainly contain Greenhouse effect, depletion of the ozone layer and acid rain etc.The major cause of global warming is caused to be a large amount of greenhouse gases that mankind's activity and occurring in nature discharge, as CO
2, wherein important greenhouse gases CO
2derive from the enterprise such as coal, oil and natural gas that the mankind use in a large number.Greenhouse effect can cause global climate change, can produce the impact being difficult to expect, as high temperature, arid, flood, Storms etc. to land natural ecosystems.In the face of Global climate change, be badly in need of the collaborative reduction in countries in the world or control CO
2discharge.
Iron and steel enterprise is the mainstay industry of Chinese national economy, is also the enterprise that energy consumption is the most serious with pollution simultaneously, at present, and the CO of iron and steel enterprise's discharge
2be only second to cement manufacturing industry.Therefore, reducing noxious gas emission, is the basic of change Iron And Steel Industry image.Development of Direct-Reduced Iron technology both can change traditional iron-smelting process for a long time, to the dependence of artificial coal, also can reduce CO simultaneously
2discharge is the effective way that steel industry realizes energy-saving and emission-reduction.Direct-reduced iron is produced according to using the kind of reductive agent different, can be divided into coal base reduction and gas-based reduction two kinds.At present, during whole world direct-reduced iron is produced, about 90% is produced by gas base directly reducing technology, and typical process has Midrex and HYL-III.Gas-based shaft kiln is the mainstream technology of the direct-reduced iron production that the world today generally acknowledges, the advantages such as throughput is large, technology maturation, stable operation, production efficiency are high that it has.China's direct-reduced iron technology is exactly as main developing direction using gas-based reduction.Traditional gas-based reduction needs enriching gas resource and ensures, and China's natural gas resource is quite deficient, and natural gas pyrolysis complex process, cost of investment is large.Therefore, Sweet natural gas is adopted to have difficulty in taking a step in China as the gas base directly reducing technology of unstripped gas.
The present invention proposes a novel process, utilizes the coke-oven gas that process of coking produces, and is transformed by its upgrading and makes rich hydrogen reduction gas (H
2and CO), be then introduced into shaft kiln directly reduced iron ore.The features such as the coke-oven gas amount of having due to coke-oven plant's output is inexpensive greatly, will reduce CO to existing Steel Complex by its upgrading direct-reduction iron ore
2quantity discharged plays a positive role.Such as can produce a large amount of hydrogen-rich gas (420Nm in coke is produced
3/ ton is burnt, gas ingredients: 55-60%H
2, 27-30%CH
4and the CO of about 7%), after appropriate upgrading, just can become the reduction of iron ore agent stronger than Sweet natural gas reducing power.
China is a Ge Chanjiao big country, and national coke output 4.28 hundred million tons in 2011, accounts for 62% of Gross World Product.Except output coke, also produce a large amount of coke-oven gas in coking production process, China's coke-oven gas aboundresources, but the actual quantity that utilizes and level very low, cause the serious wasting of resources and environmental pollution.Coke-oven gas is mainly containing a large amount of H
2, CH
4and CO, if utilize coke-oven gas to produce rich hydrogen reduction gas, not only solving discharge and the Utilizing question of coke-oven gas, also can solve the needs of reduction of iron ore gas, is that the metallurgical alternative one of present stage hydrogen obtains hydrogen-rich gas method.H/C in coke-oven gas, than higher than Sweet natural gas, prepares rich hydrogen reduction gas with it and discharges less CO by than the flow process taking Sweet natural gas as raw material
2.Following table 1 gives the CO that different flow process produces crude steel discharge
2amount:
The different flow process of table 1 produces the CO of crude steel discharge
2amount
Obviously, the coke-oven gas in Steel Complex's (long flow process) is utilized to carry out the CO that direct-reduced iron can make crude steel per ton
2quantity discharged reduces 23%, and utilizes its CO of coal gas direct-reduction of independent coking plant
2quantity discharged only reaches 48% of blast furnace process.Therefore, from economy, environmental protection and resource effectively utilize aspect, if using coke-oven gas as a kind of resource, make full use of the high physical sensible heat of coke-oven gas, directly easy for the higher hydrocarbons of raw gas condensed components is carried out cracking dry gasification, coal gas after high temperature desulfurizing passes through further reforming process again, the high physical sensible heat of coke-oven gas and high chemical energy component are converted into reducing gas as much as possible, so not only make to obtain reducing gas from coke oven crude gas significantly to be increased, also the bottleneck problem of extensive cheap reduction source of the gas is solved for promoting direct-reduced iron technical development, and pass through the reforming with recycle of the rear gas of reduction, greatly reducing CO2 emissions, is the new technological process developing a upgrading coke-oven gas reducing gas direct-reduced iron technology effective GHG (Greenhouse Gases) emissions mitigation at present.This novel process is particularly suitable for TECHNIQUE TO LARGE INTEGRATED STEEL WORKS.
Coke-oven gas upgrading is will by the methane (CH relative to reduction of iron ore inertia in coke-oven gas in fact
4) constituent element is transformed into the hydrogen and carbon monoxide (H with reducing activity
2and CO).The know-why of upgrading is the reforming reaction of the method catalytic methane by supplying oxygenant, and make the carbon in methane convert carbon monoxide to, hydrogen is changed to H
2, oxygenant comprise pure oxygen and reduction tail gas in carbonic acid gas and water vapour.
At present, methane reforming H
2mainly contain with CO technique: steam reformation, partial oxidative steam reforming and CO
2reform.Methane vapor reforming is strong endothermic reaction, and it is micro-thermopositive reaction that methane portion oxidation is reformed, and the two can reach the degree of self-heating through suitable coupling.From the angle of environment protection, methane carbon dioxide reformation consumption be greenhouse gases CO in air
2, utilize methane carbon dioxide reformation technology, can by CO
2this greenhouse gases are used, and have the double benefit of environment and'economy.
Methane portion oxidation reforming process research is in recent years more extensive.This is mainly because the synthetic gas (H of the rear gained of methane portion oxidation reformation
2and CO) H
2/ CO ratio is 2.0, can be directly used in F-T synthesis, reduce investment and production cost.Secondly, under certain condition, methane conversion and CO, H
2selectivity all can remain on a high level, the utilising efficiency of Sweet natural gas is high.Again, owing to there being O
2participation, the problem of catalyzer inactivation because of carbon deposit is than steam reforming process and CO
2reforming process is all light.Objectively speaking, partial oxidative steam reforming and steam reformation and CO
2reformation is compared also its weak point: be oxygen with the material of methane reaction, and from the obtain manner of raw material, its cost is obviously higher than steam reforming process.
The present invention utilizes composite conductor oxygen-permeating film reactor and correlation technique simultaneously, can directly use air as oxygen source, realize dynamically obtaining pure oxygen from air, reforming for coke-oven gas methane portion oxidation provides required oxygen, thus greatly reduces energy consumption, facility investment and running cost.
Composite conductor oxygen-permeating film be one roughly the same time there is the new ceramics mould material of oxonium ion and electronic conductivity.This mould material is (> 700 DEG C) at high temperature, there is in its lattice a large amount of moveable Lacking oxygen defect, when mould material both sides exist difference in oxygen concentration gradient, oxonium ion, by Lacking oxygen generation displacement, causes the directional transmissions of oxonium ion.On the other hand, the electric transmission of material internal maintains the electric neutrality of material internal.Transmission due to oxygen is that oxonium ion is realized by lattice vibration by Lacking oxygen, and thus do not have perviousness to other gas, it is 100% to the selectivity of oxygen in theory.
The rich hydrogen reduction gas produced after reforming solves CO
2the effective way of discharge, hydrogen replaces part carbon as reductive agent, solves a large amount of CO
2emission problem.This is mainly because the product of hydrogen reduction ferric oxide is water, and water again can recycle, and therefore this technique is a desirable green metallurgical pattern.Preresearch estimates, with rich hydrogen reduction gas (H
2volume fraction > 50%) be example, ton iron CO
2discharge is about 70% of traditional process.
Summary of the invention
The object of this invention is to provide one and utilize low CO
2the system and device of discharge coke-oven gas upgrading direct-reduction iron ore and method, for the rich hydrogen reduction gas of gas base directly reducing iron ore opens up a new way.
Described system and device at least comprise the desulfurizer that can remove sulphur in coke oven gas, the reaction unit tar in coke-oven gas and macromole alkanes being converted into methane small molecule component, the oxygen be separated in air device, methane small molecule component reforming reaction is generated hydrogen and carbon monoxide device and by hydrogen and carbon monoxide by the device of iron ore direct reducing iron; Wherein can remove the desulfurizer of sulphur in coke oven gas, the tar in coke-oven gas and macromole alkanes are converted into the reaction unit of methane small molecule component, be connected by pipeline successively with the device of carbon monoxide by iron ore direct reducing iron with by hydrogen with the device of carbon monoxide by methane small molecule component reforming reaction generation hydrogen, the device being separated the oxygen in air is connected by pipeline with device methane small molecule component reforming reaction being generated hydrogen and carbon monoxide.
Further, the described desulfurizer that can remove sulphur in coke oven gas is the high temperature desulfurizing reactor that the sweetening agent comprising CeOx and MO oxide compound is housed.
Further, the reaction unit tar in coke-oven gas and macromole alkanes being converted into methane small molecule component is the dry gasification scission reaction stove that macromole alkanes catalyst for cracking is housed, as Ni catalyzer.
Further, the device of the oxygen be separated in air refers to oxygen separator.
Further, device methane small molecule component reforming reaction being generated hydrogen and carbon monoxide is that the catalyst based reforming reactor of high reactivity Ni is housed.
Further, be shaft furnace by hydrogen and carbon monoxide by the device of iron ore direct reducing iron.
Further, the connecting pipeline of high temperature desulfurizing reactor and dry gasification scission reaction stove is provided with First Heat Exchanger.
Further, introducing on the pipeline of oxygen separator by air, be provided with according to the flow direction of air the waste heat recoverer that compressor and top export with off-air successively, the connecting pipeline of waste heat recoverer and oxygen separator is provided with First Heat Exchanger.
Further, dry gasification scission reaction stove is also provided with the pipeline introducing water vapour, and pipeline is provided with the second interchanger.
Further, be also provided with one between the waste heat recoverer that oxygen separator and top export with off-air and gained surplus air after oxygen separation is transported to the pipeline reclaiming heat in the waste heat recoverer exported with off-air again.
Further, be also provided with between shaft furnace and reforming reactor one by shaft furnace output containing CO
2and H
2the tail gas of O is transported to the pipeline of reforming reactor, and pipeline is provided with the 3rd interchanger.
Further, iron ore enters from shaft furnace upper end, and the sponge iron of generation is discharged from shaft furnace bottom.
A kind of low CO of the present invention
2discharge coke-oven gas upgrading direct-reduction iron ore system and device, includes coke-oven gas feed system, oxygen source air charge system, high temperature desulfurizing system, dry gasification reforming system, coke-oven gas upgrading reactive system and reduction shaft furnace reactive system; It is characterized in that structure composition and the device mode of connection that configures of each system are as follows:
A. coke-oven gas feed system: by coke oven gas pipe entrance by pipeline, be connected with reforming reactor through high temperature desulfurizing reactor, dry gasification scission reaction stove, First Heat Exchanger;
B. oxygen source air charge system: air, through entrance, by compressor, First Heat Exchanger, is connected with lower air side in oxygen separator;
C. high temperature desulfurizing system: this system is also gone here and there in coke-oven gas feed system, and major equipment has high temperature desulfurizing reactor, is equipped with containing cerium mixed oxide sweetening agent in this reactor;
D. dry gasification scission reaction system: this system is after high temperature desulfurizing reactor, and major equipment is dry gasification scission reaction stove, is mainly equipped with tar and macromole alkanes catalyst for cracking in this reaction unit;
E. coke-oven gas upgrading reactive system: this system is after dry gasification scission reaction stove, and major equipment is reforming reactor, is mainly equipped with coke-oven gas upgrading high reactivity Ni catalyst based in this reaction unit;
F. reduction shaft furnace reactive system: when gas base directly reducing iron ore and blast furnace ironmaking, the reacting phase on cohesive zone top is similar, reactor is mainly based on shaft furnace reaction; Ore and reducing gas inverse motion in shaft furnace, ore adds from furnace roof, and the sponge iron reduced is discharged from shaft furnace bottom; Rich hydrogen reduction gas enters shaft furnace from bottom, and reduction tail gas is discharged from top.
The low CO of the present invention
2discharge coke-oven gas upgrading direct-reduction iron ore system and device technological principle:
1, high temperature desulfuration agent (MO and CeO is utilized
1.72) realize the ultimate principle of desulfurizing and purifying
Sulphur in coke-oven gas is the major reason causing poisoning of catalyst inactivation in various catalytic reaction process; Coke-oven gas high temperature desulfurizing scavenging process realizes the guarantee that coke-oven gas directly carries out downstream catalytic reformation, and sulphur in coke oven gas is mainly with H
2the form of S exists, H
2s removes mainly through MS and Ce
2o
2s two kinds of typical desulphurization products exist.
2, the ultimate principle of coke-oven gas upgrading is utilized
Coke-oven gas directly can not be used as reducing gas, and the methane in coal gas is inertia to reducing iron oxides, and methane easily cracking carbon distribution occurs under high temperature with the condition that there is metallic iron; The essence of coke-oven gas upgrading in high-temperature catalyst bed, carries out reforming reaction after being mixed according to a certain ratio with reduction of iron ore tail gas by coke-oven gas, and the tail gas of iron ore direct reducing contains a large amount of oxygen-containing gas (CO
2and H
2and fail the reducing gas composition (H that makes full use of O)
2and CO), undertaken by following formula with the methane reforming reaction of tail gas after reduction of iron ore as oxygenant:
3, the ultimate principle of coking coal producer gas direct-reduction iron ore after upgrading is utilized
Through the H that high-temperature catalyst bed upgrading obtains
2be used for direct-reduction iron ore with CO gas mixture, the reaction of generation is mainly as follows:
Reduzate CO in reduction of iron ore tail gas
2and H
2o is used to the oxygenant making reforming reaction, in process, and the reduction components H be not fully utilized in tail gas
2become a part for upgrading gas with CO, this does not only need additionally to provide oxygen-containing gas, can make full use of not used up reducing gas composition yet.
Advantage of the present invention:
The low CO of the present invention
2the advantage of discharge coke-oven gas upgrading direct-reduction iron ore system and device is: can provide a large amount of rich hydrogen reduction gas needed for direct-reduced iron technology, the rich hydrogen reduction gas of upgrading gained is used for the direct-reduction of iron ore, effectively can reduce the Carbon emission in reduction of iron ore process, the route carrying out direct-reduced iron from Sweet natural gas is completely different, is suitable for the Energy resources feature of China.
Accompanying drawing explanation
Fig. 1 is the low CO of the present invention
2the system and device of discharge coke-oven gas upgrading direct-reduction iron ore and process flow sheet.
Embodiment
After now specific embodiments of the invention being described in.
Embodiment 1
The low CO of the present embodiment
2the system and device of discharge coke-oven gas upgrading direct-reduction iron ore and technical process are see Fig. 1.
Native system device includes coke-oven gas feed system, air charge system, oxygen separating system, high temperature desulfurizing system, coke-oven gas dry gasification scission reaction system, coke-oven gas upgrading reactive system and iron ore direct reducing system; The structure composition of its each system and the device mode of connection that configures as follows:
1. coke-oven gas feed system: coke-oven gas 1 delivers to reforming reactor 5 lower end through high temperature desulfurizing reactor 2, interchanger 3, dry gasification scission reaction stove 4 successively by pipeline pipeline.
2. air charge system: the waste heat recoverer 9 that air 11 is exported with off-air through compressor 10, top successively by pipeline pipeline, First Heat Exchanger 3 are delivered to oxygen separator 7 lower end.
3. oxygen separating system: this system is mainly separated the oxygen in air, is mainly oxygen separator 7, and isolated oxygen delivery is to reforming reactor 5 lower end, and after being separated, gained surplus air is transported in the waste heat recoverer 9 exported with off-air again and reclaims heat.
4. high temperature desulfurizing system: this system string is incorporated into coke-oven gas feed system, and main device has high temperature desulfurizing reactor 2.
5. coke-oven gas dry gasification system: this system walks operation under desulfurization, water vapour 15 is after the second interchanger 16 heat exchange simultaneously, in input dry gasification scission reaction stove 4, main purpose is that tar and macromole alkanes are converted into methane small molecule component, main device is dry gasification scission reaction stove 4, in device, catalyst for cracking is housed.
6. coke-oven gas upgrading reactive system: this system is operation after coke-oven gas dry gasification, the tail gas of the oxygen carried with oxygen separator 7 and direct shaft furnace 6 top output, coke-oven gas upgrading is there is in reforming reactor 5, the rich hydrogen reduction gas of output is delivered to again shaft furnace 6 lower end, complete the collecting containing oxygen tail gas 14 of unreacted.
7. iron ore direct reducing system: this operation string in coke-oven gas upgrading reactive system, main device is shaft furnace 6, shaft furnace upper end adds iron ore 13, lower end passes into the rich hydrogen reduction gas after coke-oven gas upgrading, lower end produces the iron 12 generated, and the tail gas of output is delivered to reforming reactor 5 through the 3rd interchanger 8.
Be provided with multiple location heat exchange unit in the present invention, make full use of the used heat of gas and high temperature oxygen-denuded air after reduction shaft furnace, the low CO of the present invention
2the actual operation process of discharge coke-oven gas upgrading direct-reduction iron ore system and device and technical process are see the low CO of Fig. 1
2discharge coke-oven gas upgrading direct-reduction iron ore system and device and process flow sheet.
The coke-oven gas 1 of about 800 DEG C of discharging from coke oven directly introduces high temperature desulfurizing reactor 2, and the sulphur in coke-oven gas is mainly with H
2the form of S exists, and can be removed by the sweetening agent containing CeOx and MO oxygenant, this process has been come by one or more snippets.
Coke-oven gas 1 after cleaning and desulfurization is after hot first interchanger 3 heat exchange (800 ~ 900 DEG C), in direct input dry gasification scission reaction stove 4, high temperature coke oven coal gas wets component (aromatic hydrocarbons such as tar) and the water vapour 15 after the second interchanger 16 heat exchange, input dry gasification scission reaction stove 4, generation Pintsch process reacts, and object makes it transform to generate methane class lower carbon number hydrocarbons component.
After dry gasification, coke-oven gas 1 is incorporated to reforming reactor 5, is separated 7 gained oxygen, carries out coke-oven gas reformation upgrading in reforming reactor with the reduction of iron ore tail gas 8 after heat exchange and through oxygen separator, and upgrading transforms and generates H
2and CO; Essentially CH in coke-oven gas
4the oxidizing gas produced after the reforming reaction oxygen source of gas comes from reduction of iron ore, the iron obtained due to reduction is difficult to catalytic reforming reaction (1) and (2), therefore reacts and to exist in reforming reactor on the activated catalyzer of tool and carries out.
Through reforming reactor 5 rich hydrogen reduction gas out, be transported to direct-reduction iron ore 13 in shaft furnace 6 and generate sponge iron 12, through reduction gained by product (CO
2and H
2o), after the 3rd interchanger 8 heat exchange, be again delivered to reforming reactor 5, provide coke-oven gas reformation required oxygen source, this not only reduces the oxygen-containing gas additionally provided, and also can make full use of not used up reducing gas composition.
Claims (9)
1. a system and device for coke-oven gas upgrading direct-reduction iron ore, described device comprises the desulfurizer that can remove sulphur in coke oven gas and first device, the tar in coke-oven gas and macromole alkanes is converted into reaction unit i.e. second device of methane small molecule component, is separated device i.e. the 3rd device of the oxygen in air, methane small molecule component reforming reaction is generated device i.e. the 4th device of hydrogen and carbon monoxide; First device, the second device are connected by pipeline successively with the 4th device, 3rd device is connected by pipeline with the 4th device, it is characterized in that: be also provided with the device of iron ore direct reducing iron i.e. the 5th device by hydrogen and carbon monoxide, 4th device is connected by pipeline with the 5th device, the hydrogen of generation and carbon monoxide is passed into iron ore direct reducing Cheng Tie in the 5th device; Also be provided with between 5th device and the 4th device one article by the 5th device output containing CO
2and H
2the tail gas of O is transported to the pipeline of the 4th device, and methane small molecule component reforming reaction is generated hydrogen and carbon monoxide; Described device methane small molecule component reforming reaction being generated hydrogen and carbon monoxide is that the catalyst based reforming reactor of high reactivity Ni is housed; Be shaft furnace by hydrogen and carbon monoxide by the device of iron ore direct reducing iron.
2. the system and device of a kind of coke-oven gas upgrading direct-reduction iron ore as claimed in claim 1, is characterized in that: the described desulfurizer that can remove sulphur in coke oven gas comprises CeO for being equipped with
xwith the high temperature desulfurizing reactor of the sweetening agent of MO oxide compound; Described reaction unit tar in coke-oven gas and macromole alkanes being converted into methane small molecule component is the dry gasification scission reaction stove that macromole alkanes catalyst for cracking is housed; The device of the oxygen in described separation air refers to oxygen separator.
3. the system and device of a kind of coke-oven gas upgrading direct-reduction iron ore as claimed in claim 2, is characterized in that: the connecting pipeline of described high temperature desulfurizing reactor and dry gasification scission reaction stove is provided with First Heat Exchanger.
4. the system and device of a kind of coke-oven gas upgrading direct-reduction iron ore as claimed in claim 2, it is characterized in that: air is being introduced on the pipeline of oxygen separator, be provided with according to the flow direction of air the waste heat recoverer that compressor and top export with off-air successively, the connecting pipeline of waste heat recoverer and oxygen separator is provided with First Heat Exchanger.
5. the system and device of a kind of coke-oven gas upgrading direct-reduction iron ore as claimed in claim 2, is characterized in that: dry gasification scission reaction stove is also provided with the pipeline introducing water vapour, and pipeline is provided with the second interchanger.
6. the system and device of a kind of coke-oven gas upgrading direct-reduction iron ore as claimed in claim 4, is characterized in that: be also provided with one between the waste heat recoverer that oxygen separator and top export with off-air and gained surplus air after oxygen separation is transported to the pipeline reclaiming heat in the waste heat recoverer exported with off-air again.
7. the system and device of a kind of coke-oven gas upgrading direct-reduction iron ore as claimed in claim 2, is characterized in that: be also provided with between shaft furnace and reforming reactor one by shaft furnace output containing CO
2and H
2the tail gas of O is transported to the pipeline of reforming reactor, and pipeline is provided with the 3rd interchanger.
8. a method for coke-oven gas upgrading direct-reduction iron ore, is characterized in that comprising the steps:
(1) coke-oven gas of discharging from coke oven directly introduces high temperature desulfurizing reactor, and the sulphur in coke-oven gas is mainly with H
2the form of S exists, by containing CeO
xremove with the sweetening agent of MO oxygenant;
(2) coke-oven gas after cleaning and desulfurization, after heat exchanger heat exchange, directly inputs in dry gasification scission reaction stove, and high temperature coke oven coal gas wets component and the water vapour after interchanger heat exchange, and input dry gasification scission reaction stove, Pintsch process reaction occurs;
(3) after dry gasification, coke-oven gas is incorporated to reforming reactor, and reduction of iron ore tail gas after heat exchange and through the separating obtained oxygen of oxygen separator, and in reforming reactor, carry out coke-oven gas reformation upgrading, upgrading transforms and generates H
2and CO;
(4) through reforming reactor rich hydrogen reduction gas out, be transported to direct-reduction iron ore in shaft furnace and generate sponge iron, through reduction gained by product CO
2and H
2o, by after the 3rd interchanger heat exchange, is delivered to reforming reactor again, and provide coke-oven gas reformation required oxygen source, this not only reduces the oxygen-containing gas additionally provided, and also can make full use of not used up reducing gas composition.
9. the method for a kind of coke-oven gas upgrading direct-reduction iron ore as claimed in claim 8, is characterized in that: the temperature of the coke-oven gas in step 2 after cleaning and desulfurization after heat exchanger heat exchange is 800 ~ 900 DEG C.
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| CN115305123B (en) * | 2022-07-27 | 2023-10-27 | 中钢设备有限公司 | Method and device for directly purifying and reducing coke oven gas in DRI preheating process |
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| CN101638702B (en) * | 2009-08-14 | 2011-07-20 | 中冶赛迪工程技术股份有限公司 | Recycling method of outlet gas in direct reduction process using gas as reducing gas |
| CN103525964B (en) * | 2013-10-08 | 2016-05-25 | 中国石油大学(北京) | Utilize oven gas catalyzed conversion to produce the method and system of gas base directly reducing iron |
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| WO2022262812A1 (en) | 2021-06-18 | 2022-12-22 | 宝山钢铁股份有限公司 | Straight grate-based pre-reduced pellet preparation device and method |
| WO2022262792A1 (en) | 2021-06-18 | 2022-12-22 | 宝山钢铁股份有限公司 | Pre-reduced pellet preparation apparatus and method based on grate-rotary kiln |
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