CN203513711U - System for producing gas-base direct reduction iron from coke-oven gas - Google Patents
System for producing gas-base direct reduction iron from coke-oven gas Download PDFInfo
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- CN203513711U CN203513711U CN201320617458.2U CN201320617458U CN203513711U CN 203513711 U CN203513711 U CN 203513711U CN 201320617458 U CN201320617458 U CN 201320617458U CN 203513711 U CN203513711 U CN 203513711U
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Abstract
The utility model relates to a system for producing gas-base direct reduction iron from coke-oven gas. The system comprises a purifier, a first fine desulfurization tower, a catalytic converter, a gas mixer, a vertical furnace, a cooler, a washing device, a second fine desulfurization tower, a decarbonizing device and a heater. The system provided by the utility model is used for producing synthesis gas from the coke-oven gas through a catalytic conversion method and then producing the direct reduction iron; the coke-oven gas is subjected to fine desulfurization and then the requirements on a subsequent conversion catalyst are met; then oxygen is added for combusting to provide heat to a subsequent conversion reaction; all technical indexes are controlled to enable the synthesis gas to meet the requirements of the gas-base direct reduction iron of the vertical furnace. The system has the characteristics of easiness for controlling, simple structure, low energy consumption and the like, and is particularly suitable for enterprises with pure oxygen separated from air.
Description
Technical field
The utility model relates to a kind of system of utilizing coke(oven)gas to produce gas base directly reducing iron, belongs to direct-reduced iron production technical field.
Background technology
Direct-reduced iron (DRI) claim again sponge iron, is a kind of metallic iron obtaining without blast-furnace smelting, produces the technique of DRI non-blast furnace ironmaking technique.The production technique of DRI is divided coal-based gentle base two classes.Wherein gas base method accounts for 90% of DRI output at present, typical process is pot type method (HYL method) and shaft furnace process (Midrex method), shaft furnace process adopts perpendicular type moving-bed reduction reactor, it is mainly in two sub-sections: reduction zone, at high temperature in reducing gas Gai district, circulate, more than 800 ℃ hydrogen and carbon monoxide reducing iron oxides generate DRI, and hydrogen and carbon monoxide generate water and carbonic acid gas; And the cold-zone that is positioned at bottom, reduction zone, before DRI discharging, the hydrogen that process circulates in a cooling loop and the cooling gas of carbon monoxide are cooled to envrionment temperature by the DRI of cooling zone.
Gas base method reductive agent used is mainly Sweet natural gas, through steam reforming or partial oxidation, produces synthetic gas CO+H
2, and Chinese Gas Price is expensive, at some regional Gas Prices of East Coastal, has reached 5 yuan/m
3, and adopt the refining synthetic gas price of large type coal gasification production also at 0.8 yuan/m
3above, therefore finding a low-cost reducing gas raw material channel is to greatly develop Chinese DRI to produce the problem that must face.
In state-owned a large amount of coke(oven)gas (COG) resource, except a part for generating, produce pure hydrogen, heating fuel and methanol, approximately 1/3rd resources are put into torch and are burnt.And in iron and steel enterprise, exist a large amount of fuel gas with low heat value more than needed, the blast furnace gas of emptying and converter gas etc.Along with the progress of power-saving technology, the preheating technique of hotblast stove, accumulation of heat process furnace technology etc. continues to bring out, and a large amount of fuel gas with low heat value are utilized, and having more than needed of coke(oven)gas is indubitable.Take Anshan iron and steel plant as example, predict blast furnace gas 460,000 m more than needed in 2006
3/ h, coke(oven)gas 4-6 ten thousand m that have more than needed
3/ h.
Coke(oven)gas main component is H
2(55-66%), CH
4(18-26%), CO (6-8%), all the other are carbonic acid gas, nitrogen and C
2above hydrocarbon and a small amount of oxygen and sulphur impurity are the DRI reducing gas of high-quality.
Chinese patent application CN100523228C discloses a kind of method of utilizing reducing gas prepared from coke oven gas to produce sponge iron, is adding a certain amount of CO after the desulfurization of coke(oven)gas essence
2, utilize the CH in coke(oven)gas
4and CO
2be converted and produce high-quality reduced iron synthetic gas, part reduction tail gas is as fuel, due to CO
2add and and CH
4thermo-negative reaction, need a large amount of coke(oven)gas of burning supply reaction heat outward, heating efficiency is low, flue gas energy loss is large, and adds O
2be oxidized direct heat production and compare, facility investment is large, and thermosteresis is large, and energy consumption is high, the CO adding
2also increase energy consumption and separation costs.
Chinese patent application CN101392192B discloses a kind of coke(oven)gas carbon dioxide conversion and gas-based shaft kiln directly reduced iron production method, in this application using adding oxygen, carbonic acid gas and water vapor as gas reforming agent after the desulfurization of coke(oven)gas deep purifying, too many because adding water vapor in process, after conversion, to be cooled to 40 ℃ and carry out processed, and then heat up into gas-based shaft kiln, this technique causes energy consumption high to the cooling of high-temperature synthesis gas and temperature-rise period.
Utility model content
For solving the problems of the technologies described above, the purpose of this utility model is to provide a kind of system of producing gas base directly reducing iron, and it is to utilize coke(oven)gas to produce synthetic gas by catforming, and then produces the system of direct-reduced iron, have and be easy to control, the feature such as simple in structure.
For achieving the above object, the utility model provides a kind of system of utilizing coke(oven)gas to produce gas base directly reducing iron, it is to utilize coke(oven)gas catalyzed conversion to produce the system of gas base directly reducing iron, this system of utilizing coke(oven)gas to produce gas base directly reducing iron comprises cleaner, the first smart thionizer, catalyzed conversion stove, gas mixer, shaft furnace, water cooler, washer, the second smart thionizer, decarbonizing tower, well heater, wherein:
Described cleaner is provided with coke(oven)gas input aperture, and its outlet is connected with described the first smart thionizer;
Described the first smart thionizer is provided with CO
2/ H
2o entrance, its outlet is connected with described catalyzed conversion stove, and, on the connecting tube of the first smart thionizer and catalyzed conversion stove, be provided with other gas inlet pipe roads;
Described gas mixer is respectively equipped with oxygen-containing gas entrance and CO
2/ H
2o entrance, its outlet is connected with described catalyzed conversion stove;
The outlet of described catalyzed conversion stove is connected with described shaft furnace;
Described shaft furnace is provided with pellet entrance, top gas outlet and reduced iron outlet, and it is exported with described water cooler and be connected by top gas;
Described water cooler is connected with described washer;
Described washer is connected with described the second smart thionizer;
Described the second smart thionizer is connected with described decarbonizing tower;
Described decarbonizing tower is provided with reducing gas outlet and CO
2outlet, and export with described well heater and be connected by reducing gas;
Described well heater is connected with described shaft furnace.
According to specific embodiments of the present utility model, preferably, described shaft furnace is Midrex High Temperature Gas base Shaft furnace for riducing iron or HyL High Temperature Gas base Shaft furnace for riducing iron.
Above-mentioned, utilize in the system that coke(oven)gas catalyzed conversion produces gas base directly reducing iron, this cleaner is for carrying out purifying treatment to the coke(oven)gas as unstripped gas;
The first smart thionizer carries out smart desulfurization processing for the coke(oven)gas to after purifying and de-unsaturated hydrocarbons is processed, CO
2/ H
2o entrance is used for inputting CO
2and/or H
2o is for controlling the flame temperature at converter nozzle place, and other gas inlet pipe roads are for input " gas mixtures of one or more of coal gas of converter, blast furnace gas, cleaning of off-gas ";
Gas mixer is used for oxygen-containing gas and " CO
2and/or H
2o " mix for controlling the flame temperature at converter nozzle place;
Catalyzed conversion stove for carry out catalyzed conversion and by obtained containing H
2using as reducing gas with the synthetic gas input shaft furnace of CO;
Described shaft furnace is provided with pellet entrance, top gas outlet and reduced iron outlet, and it is exported with described washer and be connected by top gas; Wherein, pellet entrance is for inputting iron ore to shaft furnace, and top gas outlet is inputted washer for the top gas (reduction tail gas) that shaft furnace is produced, the direct-reduced iron output of reduced iron outlet for production is obtained;
Washer carries out carrying out washing treatment for the reduction tail gas that shaft furnace is produced;
The second smart thionizer carries out smart desulfurization processing for the reduction tail gas to through washing, to be purified tail gas;
Decarbonizing tower is for taking off CO to cleaning of off-gas
2process CO
2outlet is used for the CO removing
2output, this part CO
2can add in material mixed gas or oxygen-containing gas, also can use as him; Reducing gas outlet, for by the cleaning of off-gas input well heater after decarburization, participates in reduction reaction to send into shaft furnace after heating as reducing gas;
Well heater is for carrying out heat treated to inputting the cleaning of off-gas of shaft furnace.
In said system, the equipment that each integral part adopts can be all existing equipment, as long as can realize corresponding function.
The system of utilizing coke(oven)gas to produce gas base directly reducing iron provided by the utility model can be carried out according to following steps the production of direct-reduction:
Make coke(oven)gas enter cleaner and purify (dedusting, de-oiling, compression), entering afterwards the first smart thionizer contacts with catalyzer and carries out smart desulfurization and take off unsaturated hydrocarbons processing, reduce the content of alkene and aromatic hydrocarbons, then be mixed to get material mixed gas and after preheating, enter catalyzed conversion stove with other gases (gas mixtures of one or more in coal gas of converter, blast furnace gas, cleaning of off-gas) from outside, oxygen-containing gas is through entering catalyzed conversion stove after preheating;
In catalyzed conversion stove, the mixed nozzle place partial combustion (partial oxidation) that is incorporated in catalyzed conversion stove of oxygen-containing gas and material mixed gas, carries out the whole and/or steam reformation of the dry weight of methane, obtains high H
2with the synthetic gas of CO concentration, the flame temperature while burning for control section, in oxygen-containing gas that can be before entering catalyzed conversion stove or material mixed gas, sneak into a certain amount of carbonic acid gas and/or water vapor;
Make synthetic gas enter shaft furnace, pellet etc. is reduced and obtains direct-reduced iron, and export output by reduced iron, the reduction tail gas (top gas) that shaft furnace top produces enters water cooler and carries out cooling, then enter in washer and wash, dry gas after washing enters the second smart thionizer and contacts with Zinc oxide catalytic and carry out smart desulfurization processing and be purified tail gas, and cleaning of off-gas enters decarbonizing tower again and removes CO wherein
2(CO
2pass through CO
2outlet is discharged), enter afterwards well heater and heat, then enter shaft furnace participation reduction reaction, cleaning of off-gas also can directly be discharged after through the second smart thionizer, for other purposes.
The system of utilizing coke(oven)gas to produce gas base directly reducing iron that the utility model provides is to utilize coke(oven)gas to produce synthetic gas by catforming, and then the system of producing direct-reduced iron, by to the desulfurization of coke(oven)gas essence, make it to reach follow-up conversion catalyst requirement, then join oxygen combustion, for follow-up conversion reaction provides heat, and control every technic index and make synthetic gas meet the requirement of shaft furnace gas base directly reducing iron, this system has the control of being easy to, simple in structure, the features such as energy consumption is low, are particularly suitable for having the empty enterprise that divides pure oxygen.
Accompanying drawing explanation
The following drawings is only intended to the utility model to schematically illustrate and explain, does not limit scope of the present utility model.Wherein:
Fig. 1 produces the structural representation of the system of gas base directly reducing iron for the coke(oven)gas that utilizes that embodiment 1 provides.
Drawing reference numeral explanation:
Smart thionizer 8 decarbonizing tower 9 well heaters 10 of smart thionizer 2 catalyzed conversion stove 3 gas mixer 4 shaft furnace 5 water cooler 6 washer 7 second of cleaner 1 first
Embodiment
For technical characterictic of the present utility model, object and beneficial effect being had more clearly, understand, referring now to Figure of description, the technical solution of the utility model is carried out to following detailed description, but can not be interpreted as restriction that can practical range of the present utility model.
The present embodiment provides a kind of system of utilizing coke(oven)gas to produce gas base directly reducing iron, and its structure as shown in Figure 1.This system comprises the smart thionizer 2 of cleaner 1, first, catalyzed conversion stove 3, gas mixer 4, shaft furnace 5, water cooler 6, the smart thionizer 8 of washer 7, second, decarbonizing tower 9, well heater 10, wherein:
Described cleaner 1 is provided with coke(oven)gas input aperture, and its outlet is connected with described the first smart thionizer 2;
Described the first smart thionizer 2 is provided with CO
2/ H
2o entrance, its outlet is connected with described catalyzed conversion stove 3, and, on the connecting tube of the first smart thionizer 2 and catalyzed conversion stove 3, be provided with other gas inlet pipe roads;
Described gas mixer 4 is respectively equipped with oxygen-containing gas entrance and CO
2/ H
2o entrance, its outlet is connected with described catalyzed conversion stove 3;
The outlet of described catalyzed conversion stove 3 is connected with described shaft furnace 5;
Described shaft furnace 5 is provided with pellet entrance, top gas outlet and reduced iron outlet, and it is exported with described water cooler 6 and be connected by top gas;
Described water cooler 6 is connected with described washer 7;
Described washer 7 is connected with described the second smart thionizer 8;
Described the second smart thionizer 8 is connected with described decarbonizing tower 9;
Described decarbonizing tower 9 is provided with reducing gas outlet and CO
2outlet, and export with described well heater 10 and be connected by reducing gas;
Described well heater 10 is connected with described shaft furnace 5.
The system of utilizing coke(oven)gas to produce gas base directly reducing iron that the present embodiment provides can be carried out according to following steps the production of direct-reduced iron:
Make coke(oven)gas enter cleaner 1 and purify (dedusting, de-oiling, compression), entering afterwards the first smart thionizer 2 contacts with catalyzer and carries out smart desulfurization and de-unsaturated hydrocarbons and process, alkene and aromatic hydrocarbons in also can saturated coke(oven)gas when hydrogen hydrogenation adsorption desulfurize is faced in employing, then other gases (gas mixtures of one or more in coal gas of converter, blast furnace gas, cleaning of off-gas) by other gas inlet pipe road inputs are mixed to get material mixed gas and after preheating, enter catalyzed conversion stove 3, and oxygen-containing gas is through entering catalyzed conversion stove 3 after preheating;
In catalyzed conversion stove 3, the mixed nozzle place partial combustion (partial oxidation) that is incorporated in catalyzed conversion stove 3 of oxygen-containing gas and material mixed gas, carries out the whole and/or steam reformation of the dry weight of methane, obtains high H
2synthetic gas with CO content, flame temperature while burning for control section, in oxygen-containing gas that can be before entering catalyzed conversion stove 3 or material mixed gas, sneak into a certain amount of carbonic acid gas and/or water vapor, for example, by gas mixer 4, in oxygen-containing gas, sneak into carbonic acid gas and/or water vapor;
Make the high H producing in catalyzed conversion stove 3
2 enter shaft furnace 5 with the synthetic gas of CO content, pellet etc. is reduced and obtains direct-reduced iron, and export output by reduced iron, the reduction tail gas (top gas) that shaft furnace 5 tops produce enters water cooler 6 and carries out cooling, then enter in washer 7 and wash, dry gas after washing enters the second smart thionizer 6 and contacts with Zinc oxide catalytic and carry out smart desulfurization processing and be purified tail gas, and cleaning of off-gas enters decarbonizing tower 9 again and removes CO wherein
2(CO
2pass through CO
2outlet is discharged), enter afterwards well heater 10 and heat, then enter shaft furnace 5 participation reduction reactions.
The present embodiment provides a kind of method of utilizing coke(oven)gas catalyzed conversion to produce gas base directly reducing iron, and it comprises the following steps, and adopts the system shown in Fig. 1 to carry out:
The flow of raw coke oven gas is 20000Nm
3/ h, wherein, in volume ratio, the content of methane is about 22%, and the content of hydrogen is about 59%, also contains a small amount of CO
2, CO, N
2and C
2 +component, total sulfur content is lower than 350ppm;
Raw coke oven gas enters cleaner 1 carries out after dedusting, degree of depth de-oiling, pressurization, and heat exchange to 220 ℃, under the pressure of 1.1MPa, enter the smart desulphurization reactor (the first smart thionizer 2) of adsorption desulfurize, totally two reactors, one opens a regeneration, and each dress faces hydrogen adsorption desulfurizing agent 25m
3face hydrogen adsorption desulfurizing agent containing 15wt% nickel and 5wt% tungsten, all the other components are zinc oxide, aluminum oxide and magnesium oxide, content is respectively 70wt%, 5wt% and 5wt%(, and should to face hydrogen adsorption desulfurizing agent be that CUPB-XTS series is faced hydrogen adsorption sweetening agent, by the special novel material of Dongying Cole, company limited produces), face hydrogen hydrogenation adsorption desulfurize simultaneously also saturated alkene and aromatic hydrocarbons in coke(oven)gas, the total sulfur content that goes out the Purge gas of smart desulphurization reactor is less than 0.5ppm, its alkene and density of aromatic hydrocarbon are less than 100ppm, are then preheating to 600 ℃;
The sky of usining divides oxygen (containing oxygen 98%), and, as the oxygenant (being oxygen-containing gas) of the hydrocarbon conversion, its flow is about 3168Nm
3/ h, is preheating to 600 ℃, if desired can be by the gas mixer 4 appropriate carbonic acid gas of input and/or water vapors, the temperature of flame during with control combustion;
Under the pressure of 0.8MPa, the nozzle place that these two strands of air-flows of raw coke oven gas and oxygen-containing gas enter catalyzed conversion stove 3 is mixed and partial combustion, flame temperature is controlled as 1500-1700 ℃, the high-temperature gas mixture obtaining after partial combustion enters the beds of catalyzed conversion stove 3, the turn over of methane and carbon dioxide dry weight and steam methane occur under catalyst action to be transformed, obtain synthetic gas, the catalyzer loading amount in catalyzed conversion stove 3 is 20m
3the conversion catalyst of coke(oven)gas is that (by the special novel material of Dongying Cole, company limited produces CUPB-DR series, nickeliferous about 10wt%, surplus is high temperature resistant aluminium silicon magnesium lanthanium complex oxide abnormity carrier), the temperature of the synthetic gas in catalyzed conversion stove 4 exits is about 1020 ℃, be decompressed to 0.3MPa, the flow of synthetic gas is about 30460Nm
3/ h, wherein, H
2: H
2o=14.9:1 and CO:CO
2=21.3:1, is mol ratio, in the composition of shaft furnace entrance synthetic gas, and (H
2+ CO)/(H
2+ CO+H
2o+CO
2) mol ratio be 0.95, index reaches the requirement of gas base directly reducing iron, can be directly used in reduced iron and produce;
The temperature of the synthetic gas that above-mentioned steps is manufactured is up to 1020 ℃, and oxidisability is 5.6%, H
2: the molar ratio of CO is higher, is about 2.92:1, is inputted Midrex High Temperature Gas base Shaft furnace for riducing iron 5 and produces.
Use traffic is 30460Nm
3the synthetic gas of/h is produced direct-reduced iron, and output is about 20
t/ h, the reduction tail gas after reduced iron carries out cooling, washer 7 through supercooler 6 and after washing, compressing, enters the second smart thionizer 8 and adopt fine desulfurizing technologies to carry out desulfurization, is purified tail gas, and the flow of the butt reduction tail gas after washing is about 21320Nm
3/ h, the total sulfur content of cleaning of off-gas, lower than 0.5ppm, then adopts pressure swing adsorption process to carry out decarburization to cleaning of off-gas in decarbonizing tower 9.The flow of the cleaning of off-gas after desulfurization decarbonization purification is about 17660Nm
3/ h, the content of water and carbonic acid gas is very low, and oxidisability approximately 3.5% is the gas base directly reducing iron reducing gas of high-quality, can use wherein 1960Nm
3the part of/h as fuel by other 15700Nm
3the gas heating of/h is to approximately 900 ℃ (can be undertaken by well heater 10), then make this part gas mix with synthetic gas (gas product of catalyzed conversion) or directly as reducing gas for shaft furnace, can increase production thus the about 10t/h of reduced iron, realize the reasonable utilization of reduced iron tail gas.
Claims (2)
1. a system of utilizing coke(oven)gas to produce gas base directly reducing iron, it is characterized in that, this system of utilizing coke(oven)gas to produce gas base directly reducing iron comprises cleaner, the first smart thionizer, catalyzed conversion stove, gas mixer, shaft furnace, water cooler, washer, the second smart thionizer, decarbonizing tower, well heater, wherein:
Described cleaner is provided with coke(oven)gas input aperture, and its outlet is connected with described the first smart thionizer;
Described the first smart thionizer is provided with CO
2/ H
2o entrance, its outlet is connected with described catalyzed conversion stove, and, on the connecting tube of the first smart thionizer and catalyzed conversion stove, be provided with other gas inlet pipe roads;
Described gas mixer is respectively equipped with oxygen-containing gas entrance and CO
2/ H
2o entrance, its outlet is connected with described catalyzed conversion stove;
The outlet of described catalyzed conversion stove is connected with described shaft furnace;
Described shaft furnace is provided with pellet entrance, top gas outlet and reduced iron outlet, and it is exported with described water cooler and be connected by top gas;
Described water cooler is connected with described washer;
Described washer is connected with described the second smart thionizer;
Described the second smart thionizer is connected with described decarbonizing tower;
Described decarbonizing tower is provided with reducing gas outlet and CO
2outlet, and export with described well heater and be connected by reducing gas;
Described well heater is connected with described shaft furnace.
2. the system of utilizing coke(oven)gas to produce gas base directly reducing iron according to claim 1, is characterized in that, described shaft furnace is Midrex High Temperature Gas base Shaft furnace for riducing iron or HyL High Temperature Gas base Shaft furnace for riducing iron.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320617458.2U CN203513711U (en) | 2013-10-08 | 2013-10-08 | System for producing gas-base direct reduction iron from coke-oven gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320617458.2U CN203513711U (en) | 2013-10-08 | 2013-10-08 | System for producing gas-base direct reduction iron from coke-oven gas |
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| Publication Number | Publication Date |
|---|---|
| CN203513711U true CN203513711U (en) | 2014-04-02 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103525964A (en) * | 2013-10-08 | 2014-01-22 | 中国石油大学(北京) | Method for producing gas-based directly reduced iron by utilizing catalytic conversion of coke-oven gas, and system thereof |
| CN106241736A (en) * | 2016-08-03 | 2016-12-21 | 西南化工研究设计院有限公司 | A kind of technique utilizing coke-stove gas extraction metallurgy reducing gases |
| CN107337179A (en) * | 2017-08-09 | 2017-11-10 | 北京京诚泽宇能源环保工程技术有限公司 | The preparation system and method for a kind of gas-based shaft kiln also Primordial Qi |
| CN107674934A (en) * | 2017-12-04 | 2018-02-09 | 山西冶金工程技术有限公司 | A kind of air supply system and technique of novel direct-reduction iron reformer |
-
2013
- 2013-10-08 CN CN201320617458.2U patent/CN203513711U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103525964A (en) * | 2013-10-08 | 2014-01-22 | 中国石油大学(北京) | Method for producing gas-based directly reduced iron by utilizing catalytic conversion of coke-oven gas, and system thereof |
| CN106241736A (en) * | 2016-08-03 | 2016-12-21 | 西南化工研究设计院有限公司 | A kind of technique utilizing coke-stove gas extraction metallurgy reducing gases |
| CN107337179A (en) * | 2017-08-09 | 2017-11-10 | 北京京诚泽宇能源环保工程技术有限公司 | The preparation system and method for a kind of gas-based shaft kiln also Primordial Qi |
| CN107674934A (en) * | 2017-12-04 | 2018-02-09 | 山西冶金工程技术有限公司 | A kind of air supply system and technique of novel direct-reduction iron reformer |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140402 Effective date of abandoning: 20160525 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |