According to the recent IEA world energy balances, the world primary energy consumption in 2040 will be approximately 1.5 times that of 2014, and most of the increase is expected to be from fossil fuels, such as oil, coal, and natural gas. It is thus likely that the development of clean carbon technologies that target zero emission is important. As is well known, a coal-based integrated gasification combined cycle (IGCC) system can achieve higher power generation efficiency compared to conventional pulverized coal-fired power plants; thus, the use of the IGCC is expected to reduce CO2 emission. However, raw fuel gas formed in coal gasification contains HCl at dozens to hundreds of 30 ppm, which would corrode the gas turbine materials in the IGCC. Furthermore, the HCl concentrations in coal gasification gas depend on the coal type and gasification method. Because HCl gas is highly reactive, it causes issues such as corrosion in gas turbines and heat exchangers. Thus, the HCl concentration in gasification gas must be reduced to 1 ppm or lower. In this study, the HCl absorption performance in simulated coal gasification fuel gases of cheap natural soda ash loaded on a honeycomb support as a hot gas cleanup method is investigated by using flow-type fixed-bed reactor. The HCl removal performance of the honeycomb-supported soda ash at 500oC in 1000ppm HCl/12-28%H2/N2 reveals that H2 does not affect the HCl absorption ability. On the other hand, the coexistence of 26-58%CO to 1000ppm HCl/12-28%H2/N2 decreases the HCl removal performance by carbon deposition from disproportionation reaction of CO. However, the addition of 2-10%CO2 to 1000ppm HCl/12-28%H2/26-58%CO/N2 improves the HCl absorption ability. In addition, the HCl removal performance of the honeycomb-supported soda ash in HCl/12%H2/26%CO/6%CO2/N2 depends on the HCl concentration (500-2000ppm) and reaction temperature (300-600oC).

Removal of hydrogen chloride gas in fuel gas using honeycomb-supported natural soda ash

ACS Fall 2020 Virtual Meeting

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