Molten slag rapid cooling, granulation and waste heat recovery power generation system and method

Abstract

The invention provides a molten slag rapid cooling, granulation and waste heat recovery power generation system and method, and belongs to the technical field of ferrous metallurgy molten slag processing and waste energy recovery. The molten slag rapid cooling, granulation and waste heat recovery power generation system comprises a slag receiving device, a heat carrier slag rapid cooling and granulation device, a slag slow-cooling device, a waste heat recovery power generation device and a waste gas purification treatment device. The molten slag is rapidly cooled and granulated by the heat carrier slag rapid cooling and granulation device, and is rapidly cooled to a glass body state; the molten slag is further cooled slowly by heat exchange to facilitate the follow-up sensitive heat recovery. According to the system and the method, the rapid cooling and granulation of molten slag are effectively realized, and the high-temperature waste heat resource is fully recycled on the basis of unaffecting the water activity of the slag.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy slag treatment and residual energy recovery, and in particular relates to a molten slag quenching granulation and waste heat recovery power generation system and a method thereof. Background technique [0002] A large amount of smelting high-temperature slag is produced in the iron and steel smelting production process. According to the statistics of iron and steel enterprises, blast furnace slag accounts for about 50% of the solid waste in the iron and steel industry, and is a silicate material with good performance. After treatment, it can be used as a raw material for cement production. [0003] There are mainly two types of blast furnace slag waste heat recovery processes: wet process and dry process. The wet process refers to the process of cooling high-temperature slag with high-pressure water. It is also generally called the water quenching process. After water quenching,...

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Problems solved by technology

In the water-quenching slag treatment system, the water-slag ratio is (8-15):1, the heat taken away by the blast furnace slag accounts for about 16% of the total energy consumption of the blast furnace, and only the total slag is recovered after various water quenching processes. 10% of the heat, the rest of the heat is turned into water vapor and put into the atmosphere, resulting in a great waste of resources. At the same time, a large amount of gaseous sulfide SO will be produced during the water quenching process. 2 and H 2 S, also pollutes the atmosphere

[0005] At present, the waste heat of molten slag is the only high-temperature waste heat resource that has not been effectively utilized in iron and steel enterprises

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