CN101812329A - Method for making reducing gas special for indirect reduction of iron oxides - Google Patents
Method for making reducing gas special for indirect reduction of iron oxides Download PDFInfo
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- CN101812329A CN101812329A CN201010147204A CN201010147204A CN101812329A CN 101812329 A CN101812329 A CN 101812329A CN 201010147204 A CN201010147204 A CN 201010147204A CN 201010147204 A CN201010147204 A CN 201010147204A CN 101812329 A CN101812329 A CN 101812329A
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- iron oxides
- indirect reduction
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Abstract
The invention discloses a method for making a reducing gas special for indirect reduction of an iron oxides and belongs to the technical field of iron-making. The method comprises the following steps of: preparing a gas generating furnace, supplying carbon, inputting oxygen, and the like, and is characterized in that: the raw material gas injected into the gas generating furnace comprises coke oven gas. The method for making the reducing gas can fully utilize chemical potential of the coke oven gas, maximize the true value of the coke oven gas, can reduce the carbon consumption and realize emission reduction of carbon dioxide, and is applied to making the reducing gas for producing sponge iron and/or being injected into a blast furnace to improve the reducing capacity of the indirect reduction section in the blast furnace.
Description
Technical field
The present invention relates to a kind of manufacture method that is exclusively used in the reducing gas of indirect reduction of iron oxides, belong to the technical field of ironmaking.
Background technology
Ironmaking is a kind of very proven technique; Iron smelting method commonly used comprises blast furnace ironmaking and produces sponge iron etc., all needs the participation of reducing gas.
In the process of blast furnace ironmaking, reducing gas mainly is the intermediate product of blast furnace ironmaking process, and it is an equal amount, adapts with the reduction degree of indirect reduction in the existing blast furnace; In order to improve the indirect reduction degree of high furnace interior, the someone has proposed to improve to the method for high furnace interior filling reducing gas the indirect reduction degree of its furnace charge.
In the production process of sponge iron, reducing gas also is one of prerequisite of making sponge iron.
The source of existing reducing gas at home, mainly relies on the conversion of carbon element; Abroad, also there is the cracking that utilizes Sweet natural gas to produce, but this method and be not suitable for the national conditions of China.The method of existing production reducing gas also has the following disadvantages:
1. utilize carbon element to produce the method for reducing gas, increased the consumption of carbon, and this carbon finally also to emit with the form of carbonic acid gas, cause the pollution of environment.
2. the existing method of utilizing carbon element to produce reducing gas, the temperature of common product gas is higher, and is not suitable for direct use, also needs the process of an appropriateness cooling, is unfavorable for save energy; When product temperature degree is low, contain organism such as a large amount of tar, phenol in the product gas, make the subsequent treatment cost height of gas, pollute big.
Summary of the invention
Purpose of the present invention is that a kind of manufacture method that is exclusively used in the reducing gas of indirect reduction of iron oxides will be provided, to produce more environmental protection, more economical reducing gas.
The technical problem to be solved in the present invention is to seek the raw material of more suitably making reducing gas, and produces required reducing gas.
Basic design of the present invention is: a kind of manufacture method that is exclusively used in the reducing gas of indirect reduction of iron oxides, comprise the outfit of producer gas generator, the supply of carbon element, the steps such as input of oxygen, it is characterized in that: the unstripped gas that injects described producer gas generator comprises coke-oven gas.
In order to increase heat supply, can be described producer gas generator input oxygen with the form of high-temperature hot-air to described producer gas generator.
In order to reduce the producer gas generator that enters of the gas that can not change into reducing gas, suggestion is when the winding-up carbon element, with the carry carrier of coke-oven gas as carbon element as far as possible.
For the lining life that prolongs producer gas generator as far as possible with eliminate organic content such as tar in the producer finished product gas, phenol, the winding-up in opposite directions on the same horizontal plane of producer gas generator specified location of suggestion spray oxygen position and coal powder injection position as far as possible; And will jet high-temperature hot-air and the plain position of winding-up charcoal of ad hoc proposal is arranged on the same plane of producer gas generator specified location.
In order to improve the effective rate of utilization of carbon element, advise that described producer gas generator adopts liquid deslagging mode, and in the producer gas generator slag bath, the jet coke-oven gas and/or the industrial oxygen of in the producer gas generator slag bath, jetting.
Major advantage of the present invention is:
1. can make full use of the chemical potential of coke-oven gas.In present Steel Complex, coke-oven gas is used for various process furnace or heating installation mostly, though with compare with its combustion power generation, the energy utilization efficiency of this mode has improved a class, but, the chemical potential that makes full use of coke-oven gas is only the mode of utilizing of its best, can embody the true value of coke-oven gas to greatest extent.
2. can reduce the consumption of carbon element, fully use the reducing power of institute's hydrogen in the coke-oven gas, really realize the reduction of discharging of carbonic acid gas.
3. the source of coke-oven gas is wider relatively, and cost is relatively low.
4. in producer gas generator, feed coke-oven gas, not only can solve the cooling problem of the coal gas of high temperature that produces in the gas making process, can also solve the intensification problem of the coke-oven gas that is added, have dual energy-saving effect.
5. be convenient to obtain the reducing gas of high density, have higher reducing power for ferriferous oxide.
6. owing to be that the coke-oven gas of virgin state is injected producer gas generator, can be with the transformed composition in the coke-oven gas, methane etc. for example, when changing into carbon monoxide and hydrogen, can remove many middle-chains again, for example separate link etc., make system simplification and reduce cost of investment and running cost etc.
Description of drawings
2 pages of drawings attacheds of the present invention, totally 2 width of cloth.Wherein:
Fig. 2 is the A-A sectional view of Fig. 1, and their mutual group become the synoptic diagram of embodiments of the invention 1.
Embodiment
The specific embodiment of the present invention will reach accompanying drawing in conjunction with the embodiments and describe.
Embodiment 1, as depicted in figs. 1 and 2.
Present embodiment is used to cooperate explanation manufacture method of the present invention.
In Fig. 1,1 expression producer gas generator.2 expression oxygen delivery passages.The transfer passage of 3 expression carbon elements (actual what use is coal dust, down with).The transfer passage of 4 expression coke-oven gas.The input channel of 5 expression secondary carbon elements.6 represent the passage of sending outside of finished product reducing gas.The 7th, to the passage of slag bath injection coke-oven gas.The 8th, to the passage of slag bath injection of oxygen (also can be high-temperature hot-air).The 9th, the liquid slag in the slag bath.Indicated position A1 and A2 in Fig. 1, expression passage 4 and/or 5 selectable location, the concrete of this position determine, needs to carry out according to the quality of the combustion conditions in the producer gas generator, the coke-oven gas imported etc.
The working process of present embodiment is such:
Oxygen is sent into producer gas generator 1 with the form of industrial oxygen by passage 2; Carbon element also is admitted to producer gas generator 1 with the form of coal injection by passage 3, though can adopt nitrogen or combustion exhaust winding-up carrier as coal dust, but, enter gasification system in order to reduce the composition that can not form reducing gas as far as possible, be to adopt the winding-up carrier of coke-oven gas here as coal dust; The amount of the coal dust that sprays into simultaneously is according to the quantity accurate calculation of the required reducing gas of indirect reduction of iron oxides.In the high-temperature burner hearth of coal gasifier, oxygen and coal dust just burn rapidly and generate a large amount of heat once spraying into burner hearth, at this moment coal dust and furnace gas all are in the condition of high temperature, when coke-oven gas and secondary carbon element also enter the high-temperature zone via passage 4,5 and mix and heat altogether, under condition red-hot, that the uncombined carbon particle exists, no matter be the carbonic acid gas that burning produces, or inherent methane and carbonic acid gas in coke-oven gas, and enter moisture of producer gas generator etc. from various channels, will be converted to carbon monoxide and hydrogen; Again by the temperature adjusting means, make product gas meet the temperature requirement of expection, just finished the manufacturing operation of the special-purpose gas that is exclusively used in described method.
Here, suggestion is the preheating temperature of control coal dust straying quatity, coke-oven gas input, coke-oven gas accurately, guarantee the quality of finished product gas and realize temperature control, the most important thing is to select furnace height, the section of burner hearth area of suitable coal gasifier, guarantee coal dust, the residence time of coke-oven gas in burner hearth, for methane, carbonic acid gas and carbon element fully react the creation time conditions.When specified product temperature degree is too low, the speed of chemical reaction can not satisfy processing requirement, for the content that guarantees the product air carbon dioxide meets the requirements, the preheating temperature that this just needs to adjust the coke-oven gas of input vapourizing furnace enables and makes reducing gas technology and coordinate mutually; When specified product temperature Du Taigao, should preferentially select to reduce the amount of oxygen of input vapourizing furnace, and make and make reducing gas technology and coordinate mutually.
What in the present embodiment, described producer gas generator adopted is liquid deslagging mode.In order to reduce the carbon residue in the slag, by passage 7 in slag bath slag 9 winding-up coke-oven gas and/or by the slag 9 winding-up oxygen of passage 8 in slag bath, mainly utilize the methane in the coke-oven gas and/or utilize oxygen and slag in high temperature carbon residue react, to reduce the carbon content of slag.
When the product gas of coal gasifier output contains more coal dust, should at first consider to prolong coal dust, coke-oven gas in burner hearth the residence time and improve temperature of reaction in the burner hearth, carbon element can fully be reacted away with methane, carbon dioxide; When containing more coal dust in the slag, should pay the utmost attention to winding-up high temperature coke oven coal gas or oxygen in slag, with assurance the remaining coal dust in the slag is reacted away.Deslagging problem as for this producer gas generator can be solved by prior art, and it does not belong to content of the present invention yet, has not just given unnecessary details at this.
It should be noted that in addition: the foregoing description only is a case of the present invention, and one of its effect is that the present invention is played explanation, and should not be construed as any restriction that the present invention is made.
Claims (7)
1. a manufacture method that is exclusively used in the reducing gas of indirect reduction of iron oxides comprises the outfit of producer gas generator, the supply of carbon element, the steps such as input of oxygen, it is characterized in that:
Comprise coke-oven gas 1.1 inject the unstripped gas of described producer gas generator.
2. the manufacture method that is exclusively used in the reducing gas of indirect reduction of iron oxides as claimed in claim 1 is characterized in that:
2.1 its to be form with high-temperature hot-air be described producer gas generator input oxygen.
3. the manufacture method that is exclusively used in the reducing gas of indirect reduction of iron oxides as claimed in claim 1 is characterized in that:
3.1 when the winding-up carbon element, it is with the carry carrier of coke-oven gas as carbon element.
4. the manufacture method that is exclusively used in the reducing gas of indirect reduction of iron oxides as claimed in claim 2 is characterized in that:
4.1 when the winding-up carbon element, it is with the carry carrier of coke-oven gas as carbon element.
5. as claim 1,2, the 3 or 4 described manufacture method that are exclusively used in the reducing gas of indirect reduction of iron oxides, it is characterized in that:
5.1 described producer gas generator adopts liquid deslagging mode, and the coke-oven gas of jetting in the producer gas generator slag bath.
6. as claim 1,2, the 3 or 4 described manufacture method that are exclusively used in the reducing gas of indirect reduction of iron oxides, it is characterized in that:
6.1 described producer gas generator adopts liquid deslagging mode, and the industrial oxygen of jetting in the producer gas generator slag bath.
7. as claim 1,2, the 3 or 4 described manufacture method that are exclusively used in the reducing gas of indirect reduction of iron oxides, it is characterized in that:
7.1 winding-up high-temperature hot-air and the plain position of winding-up charcoal are on the same plane of producer gas generator specified location.
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| CN201010147204A CN101812329A (en) | 2010-04-15 | 2010-04-15 | Method for making reducing gas special for indirect reduction of iron oxides |
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| CN201010147204A CN101812329A (en) | 2010-04-15 | 2010-04-15 | Method for making reducing gas special for indirect reduction of iron oxides |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102605119A (en) * | 2012-04-13 | 2012-07-25 | 孙慕文 | Pulverized coal conveying and preheating device used in blast furnace pulverized coal blasting process |
| CN102936633A (en) * | 2012-10-15 | 2013-02-20 | 中冶南方工程技术有限公司 | Blast furnace coal injection method adopting coke oven coal gas as coal injection conveying carrier |
| CN109937247A (en) * | 2016-11-03 | 2019-06-25 | 米德雷克斯技术公司 | Utilize the direct-reduction of coal gasification and coke-stove gas |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1186840A (en) * | 1998-01-19 | 1998-07-08 | 华东理工大学 | Coal water slurry or pulverized coal gasifying furnace with oppositely arranged nozzles |
| CN1376761A (en) * | 2002-03-29 | 2002-10-30 | 华东理工大学 | Method and equipment for charging dried coal powder in its pressurized gasification |
| CN101597658A (en) * | 2009-07-10 | 2009-12-09 | 东北大学 | A kind of blast furnace slag gasification system and method |
| CN101624539A (en) * | 2008-07-09 | 2010-01-13 | 兖矿集团有限公司 | Method of taking supplementary carbon source as gasifying agent of water-coal slurry gasifying furnace |
-
2010
- 2010-04-15 CN CN201010147204A patent/CN101812329A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1186840A (en) * | 1998-01-19 | 1998-07-08 | 华东理工大学 | Coal water slurry or pulverized coal gasifying furnace with oppositely arranged nozzles |
| CN1376761A (en) * | 2002-03-29 | 2002-10-30 | 华东理工大学 | Method and equipment for charging dried coal powder in its pressurized gasification |
| CN101624539A (en) * | 2008-07-09 | 2010-01-13 | 兖矿集团有限公司 | Method of taking supplementary carbon source as gasifying agent of water-coal slurry gasifying furnace |
| CN101597658A (en) * | 2009-07-10 | 2009-12-09 | 东北大学 | A kind of blast furnace slag gasification system and method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102605119A (en) * | 2012-04-13 | 2012-07-25 | 孙慕文 | Pulverized coal conveying and preheating device used in blast furnace pulverized coal blasting process |
| CN102936633A (en) * | 2012-10-15 | 2013-02-20 | 中冶南方工程技术有限公司 | Blast furnace coal injection method adopting coke oven coal gas as coal injection conveying carrier |
| CN109937247A (en) * | 2016-11-03 | 2019-06-25 | 米德雷克斯技术公司 | Utilize the direct-reduction of coal gasification and coke-stove gas |
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Application publication date: 20100825 |