Blast furnace slag waste heat recycling system

Abstract

The invention discloses a blast furnace slag waste heat recycling system, comprising a liquid slag transport tank, a liquid slag fixing tank, a seal flush slag tank, a flush slag water nozzle, a spiral slag removal unit, a water granulated slag dehydration unit, a water granulated slag transport belt, a flush slag water sedimentation basin, a flush slag steam discharge pipe, a dividing wall type heat exchanger, a flush slag water pump, an evaporation boiler, a generator, a steam condenser, a generating water circulation water pump, and a compressed air repressing unit. According to the invention, the present blast furnace slag water quenching technology can be kept, high activity of the products of the water granulated slag can be kept, and normal running of the industrial chain of the application channel of the water granulated slag can be guaranteed; and the recycling of the steam waste heat by using low water quantity to flush slag can be realized.

Description

technical field [0001] The invention relates to waste heat recovery and utilization of blast furnace slag, which is a waste heat recovery and utilization system capable of maintaining the water quenching process and keeping the properties and uses of the slag after water quenching unchanged. Background technique [0002] The blast furnace ironmaking process produces a large amount of liquid slag, which contains huge heat. Therefore, the recovery and utilization of blast furnace slag waste heat has great economic value. Since the blast furnace slag water quenching process is very mature, the "water slag" produced by it has a high "activity", which is not only a good "clinker" for cement, but also has become a building material industry --- concrete An indispensable "additive", the use of "water slag" to prepare cement has become a very mature technology in the building materials industry. There have been researches on the recovery of waste heat from blast furnace slag by air...

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Problems solved by technology

There have been researches on the recovery of waste heat from blast furnace slag by air quenching method and steel ball heat exchange, but these methods cannot be popularized and implemented because they change the "activity" of the final product of slag and destroy the original industrial chain.

On the premise of maintaining the water quenching process of blast furnace slag, maintaining the high activity of "water slag" products, and ensuring the normal operation of the "water slag" industrial chain, there are methods to recover the waste heat of slag flushing water, but most of them are only used for heating and bathing , its slag flushing steam has not been used

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