CN1772929A - Method and apparatus for producing directly reduced iron with coke oven gas - Google Patents
Method and apparatus for producing directly reduced iron with coke oven gas Download PDFInfo
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- CN1772929A CN1772929A CNA2005100128237A CN200510012823A CN1772929A CN 1772929 A CN1772929 A CN 1772929A CN A2005100128237 A CNA2005100128237 A CN A2005100128237A CN 200510012823 A CN200510012823 A CN 200510012823A CN 1772929 A CN1772929 A CN 1772929A
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Abstract
The present invention is method and apparatus for producing directly reduced iron with coke oven gas. The method includes heating coke oven gas in a heating furnace to 950 deg.c, feeding the heated gas as reductant into vertical furnace to reduce pellet or enriched iron ore, leading out the reduced gas from the top of the vertical furnace, purifying and cooling, burning partial top gas in the heating furnace to heat the coke oven gas, and adding the rest top gas into coke oven gas for its CO2 and H2O to react with CH4 in coke oven gas to produce CO and H2. The apparatus consists of vertical furnace with double bell top, tooth-roller feeder and discharge tank, heat accumulating heating furnace, and hoisting feeding machine. The present invention has 30 % raised coke coal resource, simplified process of producing directly reduced iron, low cost and high production efficiency.
Description
Technical Field
The invention relates to smelting of direct reduced iron, in particular to a method for producing direct reduced iron by using coke oven gas as a reducing agent. The invention also relates to a device for producing direct reduced iron by the method.
Background
At present, the yield of direct reduced iron in the world reaches 4000 million tons, and 90 percent of the direct reduced iron is produced by cracking natural gas2As a reducing agent, a typical production method is Midrex method in the united states, and the method for producing direct reduced iron is not developed in China, and the main reasons are as follows:
1. natural gas resources in China are relatively scarce and expensive, and most of the natural gas resources are used as chemical raw materials and civil gas, so that the cost for producing the direct reduced iron is too high.
2. Natural gas must be cracked to make its main component CH4Decomposition to CO + H2Can be used as a reducing agent, a cracking furnace needs a large amount of high-temperature resistant stainless steel, the process is complex, and the investment is high.
At present, the coke yield in China reaches 1.78 million tons, wherein about 40 percent of coke is produced in an independent coking plant, and a large amount of coke oven gas is diffused in the independent coking plant due to the lack of gas users, so that the energy is greatly wasted, particularly the precious coking coal resource is greatly wasted.
The search does not find a method and equipment for producing direct reduced iron by using coke oven gas as a reducing agent to carry outgas-solid phase reaction and reduce oxidized pellets and common rich iron ore.
The searched process and equipment for producing direct reduced iron by one-step method with coal gas, which is disclosed as CN1438331A, use high-temperature coal gas as a heating carrier, and mainly utilize the carbon mixed in pellets and iron oxide in the ore to carry out solid-solid phase reduction reaction to realize the direct reduction of the raw material carbon-containing iron pellets. The equipment utilizes a coke oven type furnace, the reduction chamber is clamped between the reduction gas chamber and the gas collection chamber, the path of the reduction gas passing through the reduction chamber is short, the contact time is short, and therefore the utilization rate of the reduction gas is low.
Disclosure of Invention
The invention aims to provide a method for producing direct reduced iron by using coke oven gas, which is used for improving the utilization rate of coke coal resources serving as main raw materials for steel production, simplifying the production process of the direct reduced iron and reducing the investment of production equipment and production cost.
The invention also aims to provide equipment suitable for producing the direct reduced iron by using the coke oven gas with high efficiency.
The method for producing the direct reduced iron by using the coke oven gas for realizing the aim of the invention comprises the following steps:
a. heating coke oven gas to 900-;
b. the reduced top gas is discharged from the upper part of the shaft furnace, purified and cooled, and the gaseous H generated by reduction in the top gas2And condensing and separating out O.
c. One part of the purified and cooled top gas is sent to a heating furnace to heat coke oven gas after combustion, and the other part of the purified and cooled top gas is mixed into the coke oven gas in front of the heating furnace to ensure that CO in the top gas is mixed with the coke oven gas2And H2O reacts with CH in coke oven gas at the temperature of 900-950℃ in the heating furnace4React to generate CO and H2Participate in the reduction reaction.
The invention relates to a device for producing direct reduced iron by using coke oven gas, which is applicable to the following steps:
a shaft furnace is used as a reducing furnace, a regenerative heating furnace is matched with the shaft furnace, a coke oven gas inlet of the heating furnace is provided with a gas pressurizing machine, and a hot coke oven gas output pipe is connected to an annular hot gas feeding pipe at the lower part of the shaft furnace; a gravity dust collector, a venturi tube and a washing tower are sequentially arranged and connected with a furnace top gas guide outlet at the upper part of the shaft furnace, and are connected to a combustion air access pipe of the heating furnace and a coke oven gas conveying pipe through pipelines; the upper end of the shaft furnace is provided with a double bell-type furnace top, the lower end of the shaft furnace is provided with a toothed roller type blanking machine, the lower end of the blanking machine is connected with a middle tank, and the lower end of the middle tank is provided with a discharge tank provided with an upper sealing valve and a lower sealing valve; and a feeding device consisting of an ore trough, a vibration feeder, a weighing meter and a winch type feeding machine is arranged on the double-bell type furnace top.
The applicable equipment for producing the direct reduced iron by using the coke oven gas can also comprise: and a circulating cooling gas system consisting of a cooling gas control valve, a cooling scrubber and a cooling gas pressurizer is arranged in cooperation with the discharge tank.
The invention uses coke oven gas to replace natural gas, and the basis for producing direct reduced iron as a reducing agent after direct heating without cracking is as follows:
1. the main component in the coke oven gas contains H260-65%, CO 6-8% and CH420-25%, using only H without cracking2And CO, and the iron ore can be reduced at the temperature of 900 ℃.
2. As most of coke oven gas in China is used as fuel to burn, CH4Only as during the reduction processIs still present in the top gas, and therefore CH4Even if the reaction is not carried out, the heat value of the top gas can still be kept, and the use value of the top gas is not influenced.
3. Part of CH being actually present during reduction in a shaft furnace4Can react with CO generated in the reduction reaction process2And H2And (3) O reaction:
CO + H produced2Will still participate in the reduction reaction.
4. Mixing a part of the cleaned top gas into the coke oven gas, and heating the top gas to obtain CO2And H2O will also react with CH in the coke oven gas4The above two reactions take place to produce CO and H2Participate in the reduction reaction.
Compared with the Midrex method, the method for producing the direct reduced iron by using the coke oven gas greatly simplifies the process flow and greatly reduces the construction investment and the production cost. And precious coking coal resources are fully utilized, coke produced by one ton of coking coal can not only produce 1.5 tons of molten iron through a blast furnace, but also produce 0.4 tons of direct reduced iron through the produced coal gas, so that the utilization rate of the coking coal resources which are main raw materials for steel production is improved by 30 percent.
The invention adopts the shaft furnace, the double-bell furnace top, the gear roller type blanking machine, the heat accumulating type heating furnace and the like which have relatively mature technologies to form the applicable equipment of the invention, and has the characteristics of simple equipment structure, less investment, stable and reliable work and high production efficiency.
Drawings
The attached drawing is the equipment configuration and the process flow chart of the invention.
Detailed Description
The invention is further illustrated with reference to the accompanying drawings and examples:
example one
Pellets or high-grade rich iron ore are stored in an ore trough 1, raw materials are added into a skip car of a winch type feeding machine 4 through a vibration feeder 2 and an electronic weighing scale 3 and are conveyed to the top of the furnace through a winch, and the ore materials are uniformly conveyed into a shaft furnace 6 through a double-bell type furnace top 5. The shaft furnace is composed of a steel shell and a refractory lining, and the lower part of the shaft furnace is provided with an annular hot coal gas feeding pipe 12 communicated to the inside of the shaft furnace through a plurality of injection ports. The coke oven gas for shaft furnace reduction is pressurized by a gas pressurizing machine 16 and then sent into a regenerative heating furnace 17, the gas is heated to 950 ℃, and the gas is sent into the shaft furnace through a hot gas feeding pipe to reduce the pellets. Reduction ofThe subsequent top gas is led out from the upper part of the shaft furnace, purified and cooled by a gravity dust collector 18, a venturi tube 19 and a washing tower 20, and gaseous H generated by reduction in the top gas is enabled2And condensing and separating out O. One part of the cooled and washed top gas is sent to a heating furnace to be burnt and then to heat coke oven gas, and the other part of the top gas is mixed into the coke oven gas in front of the heating furnace, so that CO in the top gas is mixed with the coke oven gas2And H2O reacts with CH in coke oven gas at the temperature of 950 ℃ in the heating furnace4React to generate CO and H2Participate in the reduction reaction. The rest part of the gas can be merged into an outer net to be used for heating a coke oven or other industrial kilns. The reduced direct reduced iron is crushed into blocks by a gear roller type blanking machine 7 arranged at the lower end of the shaft furnace, so that the blocks are uniformThe mixture falls into the intermediate tank 8. The product in the intermediate tank enters the discharging tank 10 through the upper sealing valve 9, and then is discharged through the lower sealing valve 11 arranged at the lower end of the discharging tank. The discharged high-temperature product is filled into a heat-preserving tank and directly added into an electric furnace.
Example two
Referring to the drawings, on the basis of the same process flow and equipment configuration as the first embodiment, a circulating cooling gas system composed of a cooling gas control valve 13, a cooling scrubber 14 and a gas pressurizer 15 is arranged for cooling the high-temperature products entering the discharge tank 10. The cooling medium is nitrogen, and coke oven gas or purified top gas can also be used. And after the direct reduced iron in the discharging tank is cooled to be less than 100 ℃, opening the lower sealing valve 11, unloading the finished direct reduced iron on a conveying machine, and transporting to a warehouse for storage or external sale.
Claims (3)
1. A method for producing direct reduced iron by using coke oven gas is characterized by comprising the following steps:
a. heating coke oven gas to 900-;
b. the reduced top gas is discharged from the upper part of the shaft furnace, purified and cooled, and the gaseous H generated by reduction in the top gas2Condensing and separating out O;
c. one part of the purified and cooled top gas is sent to a heating furnace to heat coke oven gas after combustion, and the other part of the purified and cooled top gas is mixed into the coke oven gas in front of the heating furnace to ensure that CO in the top gas is mixed with the coke oven gas2And H2O reacts with CH in coke oven gas at the temperature of 900-950℃ in the heating furnace4React to generate CO and H2Participate in the reduction reaction.
2. The equipment for producing the direct reduced iron by using the coke oven gas comprises a shaft furnace (6), and is characterized in that: a regenerative heating furnace (17) is matched with the shaft furnace, a coke oven gas inlet of the heating furnace is provided with a gas pressurizing machine (16), and a hot coke oven gas output pipe is connected to an annular hot gas feeding pipe (12) at the lower part of the shaft furnace; a gravity dust collector (18), a venturi tube (19) and a washing tower (20) are sequentially arranged and connected with a furnace top gas guide outlet at the upper part of the shaft furnace, and are connected to a combustion air access pipe and a coke oven gas conveying pipe of the heating furnace through pipelines; the upper end of the shaft furnace is provided with a double bell type furnace top (5), the lower end of the shaft furnace is provided with a toothed roller type blanking machine (7), the lower end of the blanking machine is connected with a middle tank (8), and the lower end of the middle tank is provided with a discharge tank (10) provided with an upper sealing valve (9) and a lower sealing valve (11); and a feeding device which consists of a mineral silo (1), a vibration feeder (2), a weighing meter (3) and a winch type feeding machine (4) is arranged on the double-bell type furnace top.
3. The apparatus for producing direct reduced iron using coke oven gas according to claim 2, wherein: a circulating cooling gas system which is composed of a cooling gas control valve (13), a cooling scrubber (14) and a cooling gas pressurizer (15) is arranged in cooperation with the discharge tank (10).
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100128237A CN100451133C (en) | 2005-09-15 | 2005-09-15 | Method and apparatus for producing directly reduced iron with coke oven gas |
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| CNB2005100128237A CN100451133C (en) | 2005-09-15 | 2005-09-15 | Method and apparatus for producing directly reduced iron with coke oven gas |
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| CN1772929A true CN1772929A (en) | 2006-05-17 |
| CN100451133C CN100451133C (en) | 2009-01-14 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011017995A1 (en) * | 2009-08-14 | 2011-02-17 | 中冶赛迪工程技术股份有限公司 | Method for reusing outlet coal gas as reducing gas in direct reduction process |
| CN102311821A (en) * | 2011-08-20 | 2012-01-11 | 太原理工大学 | Method for producing natural gas through magnetizing hematite by coke-oven gas |
| CN102605132A (en) * | 2012-01-13 | 2012-07-25 | 中冶赛迪工程技术股份有限公司 | Method for producing direct reduction iron by aid of coke oven gas |
| CN102762748A (en) * | 2010-01-18 | 2012-10-31 | Posco公司 | Molten iron manufacturing apparatus for reducing emissions of carbon dioxide |
| CN102994679A (en) * | 2012-12-26 | 2013-03-27 | 武汉桂坤科技有限公司 | Method and equipment for producing high-quality sponge iron for reduced iron powder |
| CN105278585A (en) * | 2014-07-25 | 2016-01-27 | 宝钢工程技术集团有限公司 | Coal gas control device used for COREX process and application method |
| WO2017020789A1 (en) * | 2015-08-01 | 2017-02-09 | 江学艺 | Metal ore metal recovery process and metal ore metal recovery process furnace |
| CN107058749A (en) * | 2016-12-27 | 2017-08-18 | 武汉钢铁有限公司 | The devices and methods therefor of zinc and lead in gas mud is removed using shaft furnace |
| CN115261612A (en) * | 2022-08-24 | 2022-11-01 | 武汉科技大学 | ROS shaft kiln for roasting laterite-nickel ore and ROSEF nickel-containing molten iron production method thereof |
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| JPS602362B2 (en) * | 1980-08-25 | 1985-01-21 | 株式会社神戸製鋼所 | Iron oxide direct reduction method |
| US4553742A (en) * | 1983-12-01 | 1985-11-19 | Midrex International Bv Rotterdam, Zurich Branch | Apparatus for generating a reducing gas |
| JPS6199611A (en) * | 1984-10-22 | 1986-05-17 | Nippon Steel Corp | Recirculating gas treatment device in direct reduction apparatus |
| AT382166B (en) * | 1985-05-13 | 1987-01-26 | Voest Alpine Ag | METHOD FOR DIRECTLY REDUCING PARTICULAR IRON-OXIDATING MATERIAL |
| CN1030775C (en) * | 1992-12-23 | 1996-01-24 | 东北工学院 | Process and apparatus for reducing spongy iron in coal-base shaft furnace |
| CN1102215A (en) * | 1993-10-29 | 1995-05-03 | 鞍山钢铁学院 | Method for producing direct reduced iron |
| AT406484B (en) * | 1995-08-16 | 2000-05-25 | Voest Alpine Ind Anlagen | METHOD FOR THE PRODUCTION OF LIQUID PIG IRON OR LIQUID STEEL PRE-PRODUCTS AND SPONGE OF IRON, AND SYSTEM FOR IMPLEMENTING THE METHOD |
| CN1107727C (en) * | 1999-05-25 | 2003-05-07 | 雷少军 | Technology of two-stage reduction method producing sponge iron |
| CN1159460C (en) * | 2001-07-31 | 2004-07-28 | 雷少军 | Process and equipment for preparing spongy iron by two-step reduction method |
| US7056416B2 (en) * | 2002-02-15 | 2006-06-06 | Matsushita Electric Industrial Co., Ltd. | Atmospheric pressure plasma processing method and apparatus |
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2005
- 2005-09-15 CN CNB2005100128237A patent/CN100451133C/en active Active
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011017995A1 (en) * | 2009-08-14 | 2011-02-17 | 中冶赛迪工程技术股份有限公司 | Method for reusing outlet coal gas as reducing gas in direct reduction process |
| CN102762748A (en) * | 2010-01-18 | 2012-10-31 | Posco公司 | Molten iron manufacturing apparatus for reducing emissions of carbon dioxide |
| CN102762748B (en) * | 2010-01-18 | 2014-12-10 | Posco公司 | Molten iron manufacturing apparatus for reducing emissions of carbon dioxide |
| CN102311821A (en) * | 2011-08-20 | 2012-01-11 | 太原理工大学 | Method for producing natural gas through magnetizing hematite by coke-oven gas |
| CN102605132A (en) * | 2012-01-13 | 2012-07-25 | 中冶赛迪工程技术股份有限公司 | Method for producing direct reduction iron by aid of coke oven gas |
| CN102994679A (en) * | 2012-12-26 | 2013-03-27 | 武汉桂坤科技有限公司 | Method and equipment for producing high-quality sponge iron for reduced iron powder |
| CN105278585A (en) * | 2014-07-25 | 2016-01-27 | 宝钢工程技术集团有限公司 | Coal gas control device used for COREX process and application method |
| CN105278585B (en) * | 2014-07-25 | 2017-04-19 | 宝钢工程技术集团有限公司 | Coal gas control device used for COREX process and application method |
| WO2017020789A1 (en) * | 2015-08-01 | 2017-02-09 | 江学艺 | Metal ore metal recovery process and metal ore metal recovery process furnace |
| CN107058749A (en) * | 2016-12-27 | 2017-08-18 | 武汉钢铁有限公司 | The devices and methods therefor of zinc and lead in gas mud is removed using shaft furnace |
| CN115261612A (en) * | 2022-08-24 | 2022-11-01 | 武汉科技大学 | ROS shaft kiln for roasting laterite-nickel ore and ROSEF nickel-containing molten iron production method thereof |
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| Publication number | Publication date |
|---|---|
| CN100451133C (en) | 2009-01-14 |
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Effective date of registration: 20180418 Address after: 066004 No. 71, Longhai Road, Qinhuangdao economic and Technological Development Zone, Hebei Patentee after: MCC Qinhuangdao engineering design & Research Institute Co Ltd Address before: Hebei Street West Harbor area, 066004 Hebei city of Qinhuangdao province No. 47 Patentee before: Zhongye Dongfang Engineering Techn Co., Ltd. |