The Injection Method to Ensure High Bituminous Coal Ratio

Abstract

The invention relates to the field of smelting, and discloses a high-bituminous coal injection method, comprising the following steps: A) setting a first test sampling hole at the inlet position of a medium-speed mill; B) setting step A) by using an infrared thermometer The flue gas temperature is monitored in the first test sampling hole; C) when the flue gas temperature of the first test sampling hole is lower than the preset temperature, increase the flue gas temperature in the hot blast stove and the flue gas furnace until the first test sampling hole The flue gas temperature is higher than the preset temperature. The injection method of the high bituminous coal ratio of the invention ensures the burning temperature of the hot blast stove and the flue gas furnace, increases the temperature of the exhaust gas, further controls the moisture of the raw coal, and ensures the injection of the high bituminous coal ratio.

Description

technical field [0001] The invention relates to the field of smelting, in particular to an injection method for ensuring high bituminous coal ratio. Background technique [0002] In order to further reduce the cost of ironmaking, the ironmaking plant has made major adjustments to the blast furnace coal injection structure, and the proportion of high-volatile bituminous coal has been increased from the current 15% to 40%. 18%, and the moisture content of the 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 coal is about 11%. When the proportion of bituminous coal reaches 40% and the proportion of anthracite coal reaches 60%, the water content of mixed coal raw coal reaches about 14%. To ensure a lower fuel ratio, the moisture content of the raw ...

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.

Images