Method and device for reclaiming and utilizing billet residual heat

Abstract

The invention discloses a method for recycling billet residual heat and a device thereof; water is treated by softening; superheated water is obtained through a steel making cooling system, then the superheated water and discharged billet exchange heat to obtain water vapour; the method comprises the following specific steps: A. superheated water obtained by softening tap water or cooling water is stored in a water storage tank; B. the superheated water in the water storage tank referred in the step A is conveyed to steel tubes of a heat exchange device by a high-pressure water pump through a pipeline; billet is pushed into the heat exchange device surrounded by the steel tubes; heat energy of the billet is dispersed out in order that water in the heat exchange device becomes high-temperature and high-pressure water vapour; C. the high-temperature and high-pressure water vapour passes through a superheater and impels a steam turbine to drive a dynamo to generate power; D. the water vapour after being utilized by the steam turbine is condensed into condensed water; the condensed water enters a water treating system by the pipeline, is treated by the water treating system and conveyed to a cooling water softening system of the step A by the pipeline; through the method, the device recycles cooling water, can dramatically recycle the billet residual heat in high efficiency and is stable and reliable.

Description

technical field [0001] The invention belongs to the technical field of the metallurgical industry, and in particular relates to a method and a device for recovering and utilizing the waste heat of a billet. Background technique [0002] Iron and steel plants have a lot of waste heat that can be used in production. They want to use the waste heat of continuous casting billet to convert it into steam for further power generation, rationally realize energy cascade utilization, save energy and reduce consumption, improve economic benefits, and increase the market competitiveness of enterprises. When the iron and steel plant produces continuous casting slabs, it casts molten steel at about 1500°C through the continuous casting machine into continuous casting slabs. The temperature of the continuous casting slabs reaches above 1280°C just after being pulled out, and the temperature remains at about 1200°C at the collection table, and then stacked and cooled. to room temperature. ...

AI Technical Summary

Problems solved by technology

At present, in metallurgical production, the temperature of the steel ingot coming out of the heating furnace is 1200°C, and the rolled steel is still 800-900°C on the cooling bed. These heats have never been recycled.

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