Sensible heat recovery device and waste heat recovery method for converter molten red slag

Abstract

A device for recovering sensible heat from molten red slag of a converter and a method for recovering waste heat, the device includes a dust collection cover at a charging port, a vertical cooling device, a desorbent spraying device, a slag sealing chamber, a cold air pipeline system, and a hot air pipeline System, waste heat boiler heat exchange device, return air pipeline system, the integrated cover of the charging port is set above the charging port of the vertical cooling device, and the desorbent spraying device is set at the upper end of the vertical cooling device and communicates with the inside of the vertical cooling device. The slag sealing chamber is set under the discharge port of the vertical cooling device, the steam-water pipeline system of the vertical cooling device is connected with the slag sealing chamber, the hot air piping system and the cold air piping system are connected with the vertical cooling device, and the hot air The pipeline system is connected with the return air pipeline system through the waste heat boiler heat exchange device. The invention realizes rapid cooling of molten slag, utilization of temperature gradient, continuous waste heat recovery process, high automation of device operation, energy saving, emission reduction and environmental protection, and simultaneously meets the economy of subsequent comprehensive utilization of converter molten slag.

Description

technical field [0001] The invention relates to the field of waste heat recovery of sensible heat of high-temperature molten red slag, a by-product of a smelting process in the iron and steel smelting industry or non-ferrous smelting industry, in particular to a recovery device and a waste heat recovery method for molten red slag sensible heat of a steelmaking converter. Background technique [0002] Converter slag is a by-product of the converter steelmaking process, which concentrates the oxides and sulfides formed after the iron and steel smelting raw materials are oxidized. In the steelmaking process, the converter slag produced per ton of converter steel is 80-120kg. It can be seen that the converter slag is the main waste in the iron and steel metallurgical industry, and the annual discharge is very large. [0003] A large amount of high-temperature molten slag produced in the steel production process has a temperature as high as 1300-1600°C, and the specific heat of t...

AI Technical Summary

Problems solved by technology

In the existing domestic molten slag treatment process, the cooling process of steel slag is mainly based on water cooling, and a large amount of harmful steam is generated during the cooling process, and the steam pressure is low, the quality is low, it is difficult to use it, and it is scattered into the atmosphere, which pollutes the environment. , and consume a lot of water resources

Therefore, none of the existing domestic steel slag treatment processes can realize the recovery and utilization of liquid slag sensible heat, but only consider the comprehensive utilization of the extraction of elemental iron and tailings minerals

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