Waste heat recovery system of blast furnace slag quenching water

Abstract

The invention relates to a waste heat recovery system of blast furnace slag quenching water, comprising a generation tower and a dehumidification tower. A sprayer for spraying dilute salt solution, filler and a water pipe communicated with a slag quenching water circulating system are arranged in the regeneration tower; a sprayer for spraying concentrated salt solution, filler and a water pipe in which cold water is introduced are arranged in the dehumidification tower; and dry and cold air from the dehumidification tower is introduced to a ventilating chamber. The blast furnace slag quenching water is used as a drive heat source for dehumidifying liquid and the recovered waste heat of the slag quenching water is used for producing dry air for ventilation, thereby preventing a large quantity of heat from being exhausted to the outside, reducing the pollution on the environment, changing wastes into valuables, and saving energy sources.

Description

technical field [0001] The invention relates to the technical field of waste heat recovery of blast furnace slag flushing water, and more specifically relates to a system for recovering blast furnace slag flushing water waste heat by using liquid dehumidification technology. Background technique [0002] In the blast furnace ironmaking process of iron and steel enterprises, flushing one ton of water slag consumes about 1 to 1.2 tons of fresh water, the circulating water consumption is about 10 tons, and the circulating water temperature is about 85°C. The blast furnace slag taken away by the slag flushing water The physical heat accounts for about 8% of the energy consumption of ironmaking. The traditional blast furnace slag flushing water treatment process is to simply process the high temperature slag flushing water after slag flushing through the water slag tank and the sedimentation tank, then enter the cooling tower to cool down to about 55°C, and then flush the slag ag...

AI Technical Summary

Problems solved by technology

The traditional slag flushing water circulation system discharges heat to the external environment through the cooling tower, resulting in a huge waste of waste heat

However, to recover and utilize a large amount of waste heat from blast furnace slag flushing water, there is no effective waste heat recovery system at present. The main reasons are:

[0003] 1. The temperature of blast furnace slag flushing water is relatively low, generally about 70-85°C after treatment, and this part of waste heat cannot be recovered by lithium bromide absorption refrigeration units;

[0004] 2. The temperature of the slag flushing water is relatively low, and power units such as steam turbines or screw expanders cannot be used to recover this part of waste heat for power generation;

[0005] 3. Blast furnace slag flushing water contains a large amount of solid impurities and various ions, the cost of water treatment is high, and the water temperature is further reduced during the treatment process, and the grade of waste heat is lower

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