A regenerative stainless steel slag waste heat recovery device and method

Abstract

Provided is a heat accumulating type stainless steel slag crushing and waste heat recovery process. The process includes the steps that (1) slag crushing is carried out, high-temperature stainless steel slag is poured into a roller, granular materials (such as metallic balls) are arranged in the roller, and large lumps of slag charges are crushed by the granular materials in the rotation process of the roller; (2) slag cooling is carried out, in the process of stirring the roller, when the steel slag is broken by the granular materials, the steel slag only conducts heat exchange with the granular materials as cooling media, the steel slag is cooled to below 800 DEG C, and the heat is stored in the granular materials; (3) screening is carried out, after full heat exchange, slag powder and the broken materials are fed into a vibrating screen, and separation of the granular materials and the stainless steel slag is realized; (4) waste heat recovery is carried out, the high-temperature granular materials are heated to obtain high-temperature air or steam, and powder is fed into a powder heat exchanger to continue to conduct heat exchange; and (5) circulation is carried out, and the heated granular materials are fed into the roller to continue to work. The method is based on an equivalent heat capacity method, the high-temperature stainless steel slag in liquid, lump and powder states mixed in a slag basin can be cooled and broken into uniform powder with temperature being lower than 800 DEG C, flying dust pollution is avoided, and the powder can conveniently enter the powder heat exchanger for further heat recovery.

Description

technical field [0001] The invention relates to a highly efficient, multi-functional stainless steel slag waste heat recovery method and device which are parallel to crushing and heat exchange, and is especially suitable for recovering high-temperature stainless steel slag mixed in powder state, solid state and liquid state, as well as the waste heat recovery device and process. Background technique [0002] Stainless steel slag is a kind of waste produced in the process of smelting alloy steel. Like ordinary steel slag, it belongs to high-temperature solid waste. It can replace some raw materials of cement and concrete, and high-temperature stainless steel slag contains a lot of sensible heat, which has high heat recovery and Material recovery value. In 2011, the amount of stainless steel slag in my country was about 3.4 million tons, which was the largest output among all alloy steel slags. [0003] In the waste heat recovery technology of the metallurgical industry, the ...

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Problems solved by technology

This kind of heat storage enables the heat exchange method to effectively avoid the direct contact of the cooling medium with slag, and it can prevent dust pollution when used in stainless steel slag. It is fixed with the container of the heat storage block, so the slag block and the heat storage block cannot be fully mixed, and it is not suitable for massive stainless steel slag of different sizes; and the thermal expansion mechanism of the heat storage ball block collides with the slag block at high temperature, Its reliability is difficult to guarantee

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