A method for discharging coke in a blast furnace

Abstract

A method for discharging medium coke in a blast furnace, including (1) storing medium coke in the 1# hopper near the blast furnace, and storing large coke in other hoppers; (2) medium coke hopper and large coke hopper at the beginning of discharge At the same time, when the coke is weighed to the set coke batch weight ratio, the medium coke hopper stops discharging, and the large coke hopper continues to discharge until the set coke batch weight is weighed; (3) when the coke is required to account for the total When the amount of coke is less than 10.0%, set the proportion of medium coke to the total coke to 30% to 40%. When the total coke amount is 5.0%, choose 1# hopper for 2 times; (4) When it is required that the medium lump coke accounts for more than 10.0% of the total coke amount, choose 1# hopper for 4 times, and set the ratio to 60%. The invention reduces the entry of medium coke into the center area, which is beneficial to keep the central air flow of the blast furnace unobstructed and activate the furnace hearth.

Description

technical field [0001] The invention belongs to the field of blast furnace operation control. Background technique [0002] In recent years, with the increasingly fierce competition in the iron and steel industry, various iron and steel enterprises have used various methods to reduce the cost of raw materials and fuels. In terms of comprehensive utilization of coke, the method of increasing medium-sized coke has been adopted to reduce costs. If only the medium coke is mixed into the large coke and then loaded into the blast furnace, it will bring some negative effects to the operation of the blast furnace: the medium coke and the large coke are mixed into the blast furnace, and the overall gas permeability of the coke will be changed due to the mixing effect. Poor; large coke and medium coke have a large difference in quality and particle size, and the shape of the material surface formed by different mixing effects is different, which will especially cause unstable airflow ...

AI Technical Summary

Problems solved by technology

[0007] The traditional discharge method is: medium coke and large coke hoppers start and stop discharge synchronously. The defect of this discharge method is that some medium coke will enter the tail and finally enter the central area of ​​the blast furnace