CO2 steam-water combined steel slag quenching coupling carbon fixation and pressure hot-sealing waste heat recovery system

Abstract

The invention relates to a CO2 steam-water combined steel slag quenching coupling carbon fixation and pressure hot-sealing waste heat recovery system. The system comprises a rolling crushing steel slag granulating device, a quenching fan, a slag conveyor for conveying granulated steel slag materials, a steel slag screening device, a CO2 adsorption fluidized bed conveyor, a waste heat boiler for recovering flue gas waste heat and generating steam, a primary dust remover, an induced draft fan connected with the primary dust remover through a flue, a condensation water removal device connected with the induced draft fan through a flue and used for removing water in flue gas, a secondary dust remover connected with the condensation water removal device through a flue and used for removing particles in the flue gas, and a chimney connected with the secondary dust remover through a flue. According to the system, steel slag is efficiently granulated and stabilized, the steel slag waste heat is efficiently recovered, carbon fixation is achieved, less water is used, no wastewater is discharged, the steam pressure flow is stable, waste gas is discharged up to the standard, the use amount of quenching air is reduced, and the steel slag is prevented from being adhered. The system can be widely applied to steel slag solid waste treatment, waste heat recovery and comprehensive utilization of steel plants.

Description

technical field [0001] The present invention relates to a CO 2 Steam-water combined with quenched steel slag coupling carbon fixation and pressurized stuffy waste heat recovery system can be widely used in steel slag solid waste treatment, waste heat recovery and comprehensive utilization in iron and steel plants. Background technique [0002] Steel slag is a by-product of the steelmaking process. In the process of steel production, the output of steel slag is huge. In 2020, China's steel output will rank first in the world, with 1.065 billion tons, accounting for 56.7% of global steel production, of which steel slag output is about 160 million tons. Steel slag contains a large amount of heat resources. It is estimated that 1.2GJ of sensible heat can be recovered per ton of steel slag, which is approximately equivalent to the heat generated by the complete combustion of 41kg of standard coal. The iron and steel industry is one of the industries with the largest carbon emis...

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Problems solved by technology

Among them, the hot pouring method, hot braising method, and water quenching method are widely used because of their simple process and low investment, but there are also problems such as serious fugitive emissions, waste of waste heat resources, and poor stability of steel slag.

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