CO2 emission reduction system and method based on blast furnace slag waste heat recovery and slag charge utilization

Abstract

The invention discloses a CO2 emission reduction system and method based on blast furnace slag waste heat recovery and slag charge utilization. The CO2 emission reduction system based on blast furnace slag waste heat recovery and slag charge utilization comprises a pelletizing unit, a CO2 adsorption unit, a desorption unit, a furnace slag grinding unit, a furnace slag resource utilization unit, a first air preheater, a second air preheater and a fuel gas preheater. The CO2 emission reduction system is characterized in that an adsorbent outlet of the CO2 adsorption unit is connected with an adsorbent inlet of the desorption unit; an adsorbent inlet of the CO2 adsorption unit is connected with an adsorbent outlet of the desorption unit; the CO2 adsorption unit is provided with a smoke inlet, and a smoke outlet of the CO2 adsorption unit is connected with an air inlet of the second air preheater; a second adsorbent inlet of the CO2 adsorption unit is connected with a zeolite material outlet of the furnace slag resource utilization unit; and an air inlet of the desorption unit is connected with an air outlet of the furnace slag grinding unit, and an air outlet of the desorption unit is connected with an air inlet of the fuel gas preheater. The CO2 emission reduction system and method can be broadly applied to energy saving and emission reduction of the steel smelting field.

Description

technical field [0001] The invention relates to a blast furnace slag waste heat recovery system and method, in particular to a CO system based on blast furnace slag waste heat recovery and slag utilization 2 Mitigation systems and methods. Background technique [0002] The iron and steel industry is one of the highly energy-intensive industries. Every year, its energy consumption accounts for 5-6% of the world's total energy consumption, while its CO 2 Emissions account for the world's CO 2 5-7% of total emissions. A large amount of CO emitted during the iron and steel smelting process 2 exacerbated global warming and climate change. For example, in the blast furnace smelting process, a large amount of carbon sources such as coke and coal need to be consumed, and the carbon in the carbon source is finally converted into CO 2 The form is emitted into the atmosphere, and the CO produced by 1t of pig iron in the blast furnace 2 The emission is about 1.9t. Therefore, the...

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Problems solved by technology

[0004] However, the blast furnace slag material in the dry waste heat recovery process proposed at this stage needs to be transported to the cement production plant, which increases the transportation cost

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