Raw coal preheating and dehydrating technology for blast furnace coal injection
A blast furnace coal injection and raw coal technology, which is applied in the field of blast furnace ironmaking and coal injection, can solve the problems of complex process, high investment, failure to effectively utilize the waste flue gas of iron and steel enterprises, etc., so as to save energy, reduce operating time, and promote circular economy. Effect
Active Publication Date: 2014-07-30
BEIJING SHOUGANG INT ENG TECH
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Problems solved by technology
It solves the problems of high investment or complicated process in the existing raw coal preheating and dehydration technology, and the failure to effectively utilize the waste flue gas of iron and steel enterprises, etc.
Method used
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Embodiment 1
[0025] In this example, the dry carrier gas is the waste flue gas produced by the hot blast stove, the temperature is 170°C, the moisture content of the raw coal is 20wt%, and the particle size of the raw coal ranges from 10mm to 40mm. The implementation method is as follows:
[0026] (1) Build a new drying silo 3, and connect the silo 3 to the gas inlet and pulverized coal outlet of the dust collector 1 through pipelines, so that the dust collector 1 can receive the coal powder taken away from the silo 3 by the dry carrier gas, And the collected pulverized coal is returned to the silo 3; and a star unloader 6 is set on the pipeline connected to the pulverized coal outlet of the silo 3 and the dust collector 1 to prevent the dry carrier gas from flowing backward into the dust collector 1; the dust collector The exhaust gas outlet of 1 is sealed and connected with the inlet of exhaust fan 2, so that a negative pressure is formed in silo 3; the raw coal outlet of silo 3 is connec...
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Abstract
The invention relates to a raw coal preheating and dehydrating technology for blast furnace coal injection and belongs to the technical field of blast furnace iron making and coal injection. The technology comprises the following steps of: arranging a new drying bin or transforming a conventional coal storage bin into the drying bin, dehydrating raw coal in a silo for the first time and dehydrating in the drying bin for the second time. The technology has the advantages that the raw coal is dehydrated step by step by completely adopting industrial waste gas, complete equipment runs in a negative pressure environment, the maximum capacity of the equipment is fully exerted under the condition of a conventional coal mill, the operating time of the equipment is reduced, and the maintenance frequency of the equipment is reduced while energy sources are saved.
Description
technical field [0001] The invention belongs to the technical field of blast furnace ironmaking and coal injection, and in particular relates to a process for preheating and dehydrating raw coal for blast furnace coal injection. It is a technical method for preheating and dehydrating raw coal with high water content. Background technique [0002] In the blast furnace ironmaking process, the method of injecting pulverized coal to replace part of the coke to provide heat and reduce the role of reducing agent, thereby reducing the coke ratio and reducing the cost of pig iron, has a history of half a century. Most blast furnaces are still using the pulverized coal injection process, and its economic benefits have been recognized. [0003] In the blast furnace coal injection process, the efficiency and effect of the pulverizer in the pulverization process directly affects whether it can continue to provide qualified pulverized coal for the blast furnace, while the moisture conte...
Claims
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IPC IPC(8): C10L9/00C10L9/08
Inventor 孟祥龙张福明李林王维乔
Owner BEIJING SHOUGANG INT ENG TECH