Injection method capable of ensuring high bituminous coal proportion

Abstract

The invention relates to the field of smelting, and discloses a high-bituminous-coal-proportioning injection method, which comprises the following steps: A) arranging a first test sampling hole at theinlet position of a medium-speed mill; B) carrying out flue gas temperature monitoring on the first test sampling hole formed in the step A) by adopting an infrared thermometer; and C) when the fluegas temperature of the first test sampling hole is lower than the preset temperature, increasing the flue gas temperature in a hot blast stove and a flue gas stove until the flue gas temperature at the first test sampling hole is higher than the preset temperature. According to the high-bituminous-coal-proportioning injection method provided by the invention, the furnace burning temperature of thehot blast stove and the flue gas stove is guaranteed, the waste gas temperature is increased, then the raw coal moisture is controlled, and high-bituminous-coal-proportion injection is guaranteed.

Description

technical field [0001] The invention relates to the field of smelting, in particular to an injection method for ensuring a high proportion of bituminous coal. Background technique [0002] In order to further reduce the cost of ironmaking, the ironmaking plant made major adjustments to the coal injection structure of the blast furnace, and the proportion of high-volatile bituminous coal was increased from the current 15% to 40%. 18%, and the moisture content of mixed raw coal reaches 14%. Under the premise of reducing the cost of ironmaking, it is required to achieve a large coal ratio injection, and the coal ratio is required to reach more than 170kg / t. The water content of bituminous coal is 18%-20%, and the water content of anthracite is about 11%. When the ratio of bituminous coal reaches 40%, and the ratio of anthracite reaches 60%, the moisture content of mixed raw coal reaches about 14%. To ensure a lower fuel ratio, the raw coal moisture should be controlled below ...

AI Technical Summary

Problems solved by technology

This document puts forward the explosion-proof problem of coal injection safety, but does not discuss the problem of water content in raw coal injection

[0009] Therefore, none of the prior art involves a control method for controlling the water content of pulverized coal at the outlet of the medium-speed mill based on the air-to-coal ratio of the flue gas of the hot blast stove.

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