| dc.description.abstract | Global warming, climate anomalies, and energy crisis are issues that human beings must face in this century. Advanced coal-fired power plant such as IGCC and PFBC have been proposed by scholars. In IGCC and PFBC, the high-temperature gas cleaning technology can reduce costs and increase the sensible energy utilization and have other advantages. In the high temperature gas cleaning technology, the moving bed filter has been used to remove dust and has the advantages of high temperature resistance, acid resistance, alkali resistance, high reliability and high filtration efficiency.
This study is based on the previously developed moving bed filter, which is applied to remove acid gas, and its performance is discussed. In this study, the filter material adopts economical limestone. The object of acid gas removal is as 500ppmv sulfur dioxide. The gas analyzer is installed at the outlet of the moving bed filter for online measurement to evaluate the desulfurization efficiency.
In this study, the effects of superficial velocity, inlet temperature, heating temperature and filter mass flow rate on desulfurization efficiency were investigated. The experimental results show that the desulfurization performance mainly depends on temperature. Under the heating temperature 800℃ condition, the desulfurization efficiency can reach 99%. The desulfurization efficiency tends to decrease as the mass flow rate is faster, which is caused by the inability of the filter material to be heated sufficiently. The effect between the superficial velocity and the desulfurization efficiency is weak.
The microstructure of the filter material after adsorption of sulfur content is observed. Under the heating temperature 800 °C condition, many fine pores are formed on the surface of the filter material. This feature also indicates the occurrence of indirect desulfurization, and it also improves the desulfurization performance. From the EDX component analysis, as the heating temperature increases from 600 °C to 800 °C, the proportion of sulfur content in the filter material increases from 0.17% to 4.29%, which directly shows that temperature affects the desulfurization performance of the moving bed filter. | en_US |