On the basis of a recent IEA world energy outlook, the world primary energy consumption in 2040 will be about 1.5 times that of 2014, and most of the increase is expected to be covered by fossil fuels, such as oil, coal and natural gas. It is thus likely that the development of clean carbon technologies which 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 IGCC is expected to contribute to a reduction in CO2 emission. However, raw fuel gas formed in coal gasification contains hydrogen chloride (HCl) at dozens to hundreds of ppm, which would corrode the gas turbine materials in the IGCC. Many researches on the removal of HCl have thus been carried out, and the method can be classified into cold gas cleaning and hot gas cleanup. Although the former method is well established, it is likely that the advancement of processes for the hot gas cleanup is extremely important for further improving the efficiency of the IGCC system. In this study, we examined the HCl absorption performance of cheap natural soda ash loaded on a honeycomb support as a hot gas cleanup method. The honeycomb-supported soda ash drastically improved the HCl absorption extent at the 1-ppm breakthrough time compared to the result without the support; thus, the use of the support was justified. The HCl removal performance of the honeycomb-supported soda ash depended significantly on temperature (573-873 K). Under the present conditions, the absorption extent at 1-ppm breakthrough time was maximized at 773 K. This absorption extent increased as the HCl concentration in the supplied gas decreased, and it was assumed that this absorbent was suited to actual coal gasification processes. No change in the HCl absorption extent (60-65 %) was observed for Na2CO3 loading between 33 and 65 mass%.

High performance of honeycomb-supported natural soda ash in the removal of hydrogen chloride gas

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.