Method for injecting high-volatile bituminous coal into blast furnace
A blast furnace coal injection and bituminous coal separation technology, applied in the field of blast furnace coal injection, can solve the problem that the overall coal volume cannot be increased, and achieve the effect of improving product competitiveness and reducing production costs
Inactive Publication Date: 2011-07-06
BAOSTEEL GROUP XINJIANG BAYI IRON & STEEL
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[0004] With the commissioning of new blast furnaces, the overall coal v
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[0099] detailed description
[0100] A method for blast furnace coal injection using high volatile bituminous coal. The temperature at the entrance of the mill is equal to 320 degrees, the oxygen content at the outlet of the bag is equal to 4%, the oxygen content at the entrance of the mill is equal to 3%, and the oxygen content of the flue gas is equal to 2%. When the carbon monoxide content in the pulverized coal silo is equal to 2000 ppm and the temperature of the pulverized coal is equal to 70 degrees, the volatile content of the pulverized coal injected into the blast furnace is equal to 35%.
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The invention discloses a method for injecting high-volatile bituminous coal into a blast furnace. Under the conditions that the inlet temperature of a mill is less than or equal to 40 DEG C, the content of oxygen at the outlet of a cloth bag is less than or equal to 6 percent, the content of oxygen at the inlet of the mill is less than or equal to 3.5 percent, the content of oxygen in flue gas is less than or equal to 3 percent, the content of carbon monoxide in a coal powder bin is less than or equal to 3,000PPm and the temperature of coal powder is less than or equal to 80 DEG C, the content of volatile in the coal powder injected into the blast furnace is 30 to 35 percent. By the method, the high-volatile bituminous coal with 35 percent of volatile can be injected into the blast furnace for safe operation, and the bituminous coal with the price of 200 yuan/ton instead of washed coal with the price of more than 800 yuan/ton can be used for producing the coal powder, so that the production cost of enterprises can be greatly reduced, and product competitiveness is improved.
Description
technical field [0001] The present invention relates to blast furnace coal injection method, especially the method of blast furnace coal injection using high volatile bituminous coal, Background technique [0002] Coal injection is an important means of saving energy and reducing consumption in the iron and steel industry. Injecting 1Kg more pulverized coal per ton of pig iron will generate a profit of about 0.36-0.8 yuan per ton of iron. How to increase the ratio of coal injection and how to increase the replacement ratio of pulverized coal is a market issue. Under economic conditions, it is one of the important means of industry competition. The ash content of the raw coal injected by the blast furnace coal injection at the initial stage of operation does not exceed 8%, the volatile content does not exceed 25%, and the fixed carbon content of nearly 70% creates a good material foundation for the blast furnace to save coke. [0003] At present, most domestic iron and steel...
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Inventor 郑拥军张群袁万能刘文壮陶宏
Owner BAOSTEEL GROUP XINJIANG BAYI IRON & STEEL
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