A blast furnace coal injection method using semi-coke as part of the fuel

Abstract

The invention discloses a blast furnace coal injection method taking semi coke as partial fuel. The blast furnace coal injection method is characterized in that the semi coke is formed by carrying out dry distillation on iron ore concentrate and pulverized coal at the temperature of 700-920 DEG C, wherein mass percentage content of metallic iron in the semi coke is required to be less than 30%, and the mass percentage content of semi coke with the granularity less than 30mm accounts for more than or equal to 50% of the total semi coke; and after the semi coke is put into a raw coal bin, putting onto a coal carrying main belt by virtue of a disc coal feeding machine, uniformly mixing common pulverized coal with coal pulverized by a medium-speed pulverizer to form mixed pulverized coal, fluidizing by virtue of a coal injecting tank, and injecting the mixed pulverized coal into a blast furnace convolution region by virtue of a coal lance, wherein addition amount of the semi coke in the mixed pulverized coal can be calculated according to a formula (described in the specification), and mass percent of the semi coke added into the pulverized coal is less than or equal to 70%.

Description

technical field [0001] The invention belongs to the technical field of ironmaking, and in particular relates to a blast furnace coal injection method in which Garland Coal is mixed in the blast furnace coal injection process. Background technique [0002] Blast furnace coal injection technology is a technology widely used by domestic and foreign iron and steel enterprises. Blast furnace coal injection can reduce the use of coke, reduce the dependence of blast furnace ironmaking on increasingly scarce coking coal, and at the same time reduce the number of coke ovens and prolong coke The service life of the furnace, reducing the environmental load of coking and blast furnace ironmaking, has greatly reduced the cost of ironmaking production, especially in today's increasingly stringent requirements for energy consumption and environmental issues, blast furnace coal injection technology has become a contemporary blast furnace ironmaking technology important direction of progress...

AI Technical Summary

Problems solved by technology

For this reason, experts and researchers at home and abroad pay more attention to the coal injection process, such as the improvement of the coal injection process itself, through the improvement of equipment such as fluidized plates, injection tank groups, and pressure piping, etc., to achieve blast furnace coal injection The amount of coal injection in the process is increased and the operating cost is reduced, (see the Chinese patent "Blast Furnace Coal Injection System" Patent Application No. CN201817501U, "Blast Furnace Large Coal Injection Process under Intensified Smelting Conditions" Patent Application No. CN1667316, "A Blast Furnace Coal Injection System" Blowing method and its system" patent application CN101781692A, "a blast furnace pulverized coal injection system and process" patent application number CN102787191A, etc.), such inventions have realized uniform and stable injection of coal powder and precise control of injection volume, meeting the requirements of coal Powder dense phase conveying technology can achieve low gas consumption and reduce the cost of coal injection, but it is only suitable for injection of ordinary pulverized coal; Under different process systems, finished product semi-coke or molded coke are obtained (see Chinese patent "the method for extracting germanium-containing material from lignite dry distillation and making semi-coke" patent application number CN1814701, "low-temperature coal dry distillation production process" patent application number CN1966612, "one Patent application number CN101113340 for carbonization process of high-volatile coal, patent application number CN101113340, patent application number CN1865398 for low-temperature carbonization method and device for high-volatility weak-caking coal, and a method for producing high-quality semi-coke from low-quality lignite Application number CN1869158 etc.) this kind of method all is the method and the device that adopt as a kind of common production technology of semi-coke, and does not mention the use place of finished product semi-coke, more does not mention that semi-coke is used for blast furnace injection Then there are some techniques and methods about coke powder, charcoal and semi-coke used in blast furnace injection (see Chinese patent "Blast Furnace Dry Quenching Coke Powder Injection Process and Equipment" Patent Application No. CN101020931, "Ironmaking Blast Furnace Injection Coal Technology Using Semi-coke in Plant” Patent Application No. CN102827972A, “Method of Injecting Charcoal Powder into Blast Furnace” Patent Application No. CN1133889, “A Blast Furnace Injection Mixed Fuel and Its Injection Method” Patent Application No. CN104212508A etc. etc.), such inventions mention the use of dedusting ash and coke powder to replace part of coal powder to recycle waste resources, which can effectively reduce coke consumption, reduce environmental pollution caused by coking, and improve social and economic benefits, but for different How to use these secondary products in the blast furnace under the operating conditions is not explained; in addition, there are methods and technologies for injecting some combustion aids and coke oven gas (see Chinese patent "A Blast Furnace Injection Coke Oven Gas Process Device" Patent application number CN202912975U, "a composition for blast furnace pulverized coal injection and its preparation method" patent application number CN101768496A, etc.), this type of method can effectively optimize the combustion of pulverized coal, improve the quality of molten iron, increase iron production, and greatly reduce the smelting process. cost of iron and reduce carbon dioxide emissions, but such methods are only added as gas injection or combustion aids, which are different from high It has nothing to do with the injection of blue charcoal in the furnace, or some domestic and foreign literature has mentioned the use of semi charcoal, (see the journal "Chemical Technology Economics" "Application of semi charcoal in calcium carbide production", 2004, volume 22, Issue 12, 23-25; "Clean Coal Technology", "Research on the Production of Metallurgical Formed Coke from Semi-coke Powder", 2006, Volume 12, Issue 1, 24-26, etc.), such materials mentioned that semi-coke was used for calcium carbide The method and technology of producing and making coke for gold, etc., but there is still no mention of blast furnace injection and how to inject it

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