Recovery method of steel slag residual heat and system thereof

Abstract

The invention discloses a recovery method of steel slag residual heat and system thereof. The system is composed of a steel slag flow distributor, a water-cooling granulation wheel, a first fluidized bed, a weigher, a vibration sieve, a hot slag particles bunker, a second fluidized bed, a dedusting device, a blower and a residual heat boiler in sequence. The method is that, pouring high-temperature liquid slag into the steel slag flow distributor, the steel slag flown out of the steel slag flow distributor falling onto the water-cooling granulation wheel and being crushed and throwing out to fall into the first fluidized bed for exchanging heat with air, hot slag particles discharged from the first fluidized bed is stored in the hot slag particles bunker after going through the weigher and the vibration sieve, and discharging when the temperature is cooled to 350 DEG by a heat exchanger of the second fluidized bed. High-temperature air discharged from the first fluidized bed and the second fluidized bed enters the residual heat boiler for exchanging heat after dedusting. The invention can reduce energy consumption in steel production, graining effect of the steel slag is good, which is benefit for following degradation of free CaO and magnetic separation of wasted steel.

Description

technical field [0001] The invention relates to a waste heat recycling technology, in particular to iron and steel metallurgy energy saving and secondary energy recovery. Background technique [0002] Steel is the structural material with the largest consumption and the functional material with the highest output. The iron and steel industry is one of the pillar industries of my country's national economy. With the rapid growth of steel production, resources, energy and environmental pollution have become the limiting factors restricting the sustainable development of my country's steel industry. In the process of iron and steel metallurgy, a large amount of high-temperature steel slag is produced, which contains a large amount of heat. Its recycling is of great significance for iron and steel enterprises to save energy, water consumption and reduce pollutant emissions. [0003] The annual output of crude steel in my country has exceeded 500 million tons, and 80-150 kg of ...

AI Technical Summary

Problems solved by technology

Worldwide, there is no industrial recovery method for the physical heat and phase change heat contained in liquid high-temperature steel slag

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