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Owning to its low calorific value and combustion efficiency, a lot of blast furnace gas (BFG) is wasted in China. In this paper, pressure swing adsorption (PSA) technology was applied to purify BFG, which can improve the calorific value and combustion efficiency significantly. The technical feasibility, combustion efficiency and engineering economy analysis showed that BFG purified by PSA was the most effective way for energy saving and had a broad application prospect.

Separation of CO from blast furnace gas is an international problem, which is mainly due to the blast furnace gas also contains a large number of N2 and CO2. Because of the close boiling point of N2 and CO, the traditional cryogenic rectification process cannot be used to separate CO from blast furnace gas. The adsorption of CO and N2 is low, and the adsorption of CO2 is easy to poisoning and deactivation, so the conventional pressure swing adsorption method cannot be used for CO separation of blast furnace gas.