Spiral vibrating bed waste heat recovery device in melted blast furnace slag granulation process

Abstract

The invention discloses a spiral vibrating bed waste heat recovery device in a melted blast furnace slag granulation process. The device consists of a spiral vibrating bed rapid cooling unit in a granulation stage and a waste heat recovery unit. The spiral structure of the spiral vibrating bed rapid cooling unit in the granulation stage can prolong landing distances of melted blast furnace slag particles after the melted blast furnace slag particles are subjected to dry-method granulation process, bottom circulating cooling air and the melted slag particles are subjected to heat exchange through pores on a screening bed surface in a countercurrent way, so that the cooling speed is improved, a target of quenching the blast furnace slag is realized, the bonding between the melted slag particles and between the slag particles and a vibrating bed surface is effectively prevented, and the blast furnace slag particles with glass structures are obtained as many as possible; and the waste heat recovery unit comprises a matched dedusting and air supply system, a secondary cooling device and a waste heat utilization device. High-temperature air recovered by the spiral vibrating bed rapid cooling unit in the granulation stage is provided for a hot air furnace through a dust remover and an air supply pipeline part, the rest of high-temperature air is fed into the secondary cooling device for continuous heat exchange and heating up, and the high-temperature air at a temperature of 700 DEG C enters a waste heat boiler for generating steam for power generation.

Description

technical field [0001] The invention belongs to the technical field of high-temperature solid waste treatment and recovery of waste heat and energy, and in particular relates to a spiral vibrating bed waste heat recovery device for molten blast furnace slag in the solidification and cooling process in the dry granulation treatment of molten blast furnace slag liquid. Background technique [0002] The metallurgical industry is the largest energy-consuming unit, with an annual energy consumption of 20GJ. Since 1980, my country's iron and steel industry has made great achievements in energy saving, but there is still a shortage in the recycling of waste heat resources. Relevant research results show that the sensible heat recovery rates of flue gas, cooling water and molten slag are very low. Among them, the recovery rate of slag sensible heat is the least, only 1.59%. Iron and steel industry slag includes ironmaking blast furnace slag, steelmaking slag, ferroalloy slag, no...

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Problems solved by technology

[0006] In order to achieve the purpose of rapid cooling of molten blast furnace slag, and to solve the problems of insufficient cooling speed or slag particles sticking to the wall during the dry granulation process of molten blast furnace slag, the previous method was to increase the size of the equipment and increase the cooling air volume, resulting in The size of the granulation treatment equipment is relatively large, and the recovery air temperature is low, which makes the practical application of blast furnace slag dry granulation treatment equipment difficult, and has not yet achieved large-scale industrialization and application

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