Method and device for improving energy efficiency in ironmaking process

Abstract

The invention relates to a method for improving energy efficiency of an iron-making technology. Liquid blast furnace slag is introduced into a waste heat recovery tank body, and at the same time, a solid coolant is added into the waste heat recovery tank body; the solid coolant comprises at least iron-containing solid particles; slag flows and coolant material flows converge, so that a hot solid mixture material flow is formed; during the falling process, the hot solid mixture material flow is impacted and broken; scattered hot solid mixtures exchange heat with upstream cooling gas; high-temperature gas after heat exchange is exhausted out of the waste heat recovery tank body for recovery; and low-temperature solid mixtures after heat exchange are discharged out of the waste heat recovery tank body, and then crushing and magnetic separating are carried out, so that iron-containing solid particles and glassy-state blast furnace slag is obtained. The invention further relates to a device which can implement the method. According to the simple method for processing blast furnace slag, heat of the blast furnace slag can be effectively recovered; the provided device is simple in structure, easy to maintain and small in occupied area; local materials can be used as the coolant and the cooling gas and the like; and the investment cost and the operation cost are extremely low.

Description

technical field [0001] The invention belongs to the technical field of blast furnace ironmaking, and in particular relates to a method and a device for improving the energy efficiency of an ironmaking process. Background technique [0002] Blast furnace ironmaking is a major energy consumer in iron and steel enterprises, and its energy consumption accounts for about 60% of the total energy consumption of iron and steel production. Obviously, the ironmaking process is the top priority for iron and steel enterprises to reduce energy consumption and improve energy utilization efficiency. The energy consumption of the high-speed ironmaking process is about 390kgce, and its energy consumption expenditure items are mainly heat absorption of iron ore reduction reaction, sensible heat of molten iron, sensible heat of slag, heat taken away by gas, cooling water and other heat dissipation, etc., reducing the cost of each expenditure item Energy consumption or waste heat recovery of va...

AI Technical Summary

Problems solved by technology

The water quenching method consumes a huge amount of water, the heat of the slag can hardly be recovered, and the slag meets water to produce a large amount of water vapor, H 2 S, SO 2 Disadvantages such as polluting the environment and consuming additional energy for slag drying

In addition, workers in the fields of metallurgy, energy and environmental protection at home and abroad have successively proposed various dry treatment methods for blast furnace slag, which can be mainly divided into air quenching method, centrifugal granulation method, mechanical granulation method, etc. The process flow of these methods Although the design includes the recovery of blast furnace slag waste heat, these methods all have problems such as large power consumption, large and complex equipment structure, unstable operation, and poor slag granulation effect. Therefore, it is necessary to develop a low-energy, high-efficiency A stable slag waste heat recovery method and device is one of the important issues to be solved urgently to improve the energy efficiency of the blast furnace ironmaking process

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