The Combustion Economy of Purifying CO from Blast Furnace Gas by Pressure Swing Adsorption
Abstract: 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. Key words: Blast Furnace Gas , Pressure swing adsorption, combustion economy. 1. Introduction Blast Furnace Gas (BFG) is a byproduct of blast furnace ironmaking process, and its emission occupies the highest proportion in the by-product gas of the steel industry. It consists primarily of N2, CO, CO2, H2, CH4, etc., with the specific composition as shown in Table 1. Because the calorific value of blast furnace gas is generally only about 3,000-3,800 kJ/Nm3, it cannot meet the requirement of ind...