System and method for comprehensive treatment of blast furnace slag and recovery of sensible heat for power generation

Abstract

The invention provides a blast furnace slag overall treatment and sensible heat recovery power generation system and method, and belongs to the technical field of ferrous metallurgy furnace slag treatment and surplus energy recovery. The system comprises a slag receiving device, a limestone feeding device, a furnace slag overall treatment device, a slag charge cooling device, a cold slag charge circulating unit, a waste heat recovery power generation device and a waste gas purification treatment device. The special furnace slag overall treatment device is used for tempering and modifying blast furnace slag, the blast furnace slag is broken into blocky slag charge, the blocky slag charge is cooled through a grate cooler, hot waste gas is generated and generates superheated steam through a waste heat boiler, and a steam turbine generator unit is pushed to act and generate power. Sensible heat recovery of the blast furnace slag is effectively achieved, and high-temperature waste heat resources of the furnace slag are efficiently and fully recovered on the basis that the following use value of the blast furnace slag is not affected.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgical slag treatment and residual energy recovery, and in particular relates to a blast furnace slag comprehensive treatment and sensible heat recovery power generation system and method. Background technique [0002] The iron and steel industry is a pillar industry of the national economy and an energy and resource-intensive industry. Improving energy and resource utilization efficiency has always been the focus of the steel industry. During the blast furnace smelting process, the iron ore, flux and coke added from the top of the furnace become liquid phase in the high-temperature combustion zone in the furnace, and the molten blast furnace slag formed floats above the molten iron and is discharged from the furnace body through the slag discharge port. The blast furnace slag The furnace temperature is generally between 1400 ~ 1550 ℃, and each ton of slag contains (1260 ~ 1880) × 1...

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Problems solved by technology

However, in the granulation process, the power consumption of the fan is very large, the overall operating cost is high, and the entire system occupies a large area, which makes it difficult to select a building site, so there is no report on the subsequent use of this process

The centrifugal granulation method is still in the stage of theoretical research or small-scale simulation experiments, and there is no effective industrialized method and technology for slag quenching granulation and waste heat recovery.

At present, the centrifugal granulation method has a good effect on the granulation of molten slag, but it is not ideal in terms of the quenching effect and the thermal efficiency of slag waste heat recovery.

Moreover, under long-term high-temperature conditions, the transmission and lubrication problems of the centrifugal granulation device have not been well resolved

[0004] At present, the waste heat of molten slag is the only high-temperature waste heat resource that has not been effectively utilized in iron and steel enterprises

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