Blast furnace slag waste heat recycling and flue gas CO2 adsorption/desorption coupling system, and method

Abstract

The invention discloses a blast furnace slag waste heat recycling and flue gas CO2 adsorption / desorption coupling system, and a method. The blast furnace slag waste heat recycling and flue gas CO2 adsorption / desorption coupling method comprises following steps: blast furnace slag is subjected to crushing and pelletizing so as to obtain blast furnace slag particles; heat exchange between the blast furnace slag particles and fluidizing air is carried out so as to obtain a first high temperature gas; after heat exchange, the blast furnace slag particles are delivered into a next grade furnace slag cooling device, secondary cooling of the blast furnace slag particles is carried out with fluidizing air so as to obtain a second high temperature gas; a high temperature adsorbent is delivered into a high temperature adsorption plant, flue gas to be treated is delivered into the high temperature adsorption plant, and the second high temperature gas is used for supplying the high temperature adsorption plant with heat energy, the high temperature adsorbent is used for adsorbing CO2 in the flue gas to be treated, and obtained purified flue gas is discharged. The blast furnace slag waste heat recycling and flue gas CO2 adsorption / desorption coupling method is capable of realizing graded high efficiency utilization of recycled blast furnace slag waste heat, and reducing available energy loss in waste heat recycling process; and a novel method is provided for energy conservation and emission reduction in the field of steel-smelting.

Description

technical field [0001] The invention relates to a blast furnace slag waste heat recovery system and method, in particular to blast furnace slag waste heat recovery and utilization and flue gas CO 2 Adsorption-desorption coupling system and method. Background technique [0002] A large amount of blast furnace slag, which contains high-grade heat, is formed during the blast furnace ironmaking process in the steel production process. At the same time, CO in the blast furnace ironmaking process 2 of CO emissions in the total iron and steel production process 2 About 60% of emissions. [0003] Blast furnace slag is a by-product formed by gangue in ore, ash in fuel and non-volatile components in flux during the blast furnace smelting process. The main components of blast furnace slag are CaO and SiO 2 、A1 2 o 3 , Fe 2 o 3 , MgO, TiO 2 etc. In 2014, my country's pig iron output was about 7.12×10 8 t, calculated on the basis of 0.3t of blast furnace slag produced per ton o...

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Problems solved by technology

However, there are many shortcomings in the water quenching method: the sensible heat of blast furnace slag cannot be recycled, and it causes a lot of waste of water resources; it will also cause serious pollution to the atmosphere, water and soil

However, the thermal quality of the hot air obtained by the physical method is not high, and the utilization value is low.

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