| dc.description.abstract | With the rapid development of the Industrial Revolution, human technological advancements have significantly progressed, leading to an increased consumption of energy. In the early stages, countries primarily relied on coal-fired power generation, which directly resulted in global environmental issues such as greenhouse gas emissions, energy crises, and environmental pollution. As advanced coal-fired units, such as IGCC and PFBC, were successively proposed by scholars, the application of high-temperature gas purification technology in these advanced coal-fired units has shown significant thermodynamic improvements and effective reduction of overall technical costs. Among the high-temperature gas purification technologies, the mobile granular bed filter has been verified by previous researchers for its ability to remove dust and tar, offering advantages such as high-temperature resistance, acid and alkali resistance, low pressure drop, and high filtration efficiency.
This study is based on the previously developed mobile granular bed filter and applies it for dust and sulfur removal, investigating its performance. Economically viable limestone is chosen as the filtering material, with a dust concentration of 7500 ppmw and a sulfur dioxide concentration of 500 ppmv used as the contaminated gas. Gas analyzers and PPC (Process Particle Counter PPC-100) are installed at the outlet of the granular bed filter for online measurement to evaluate the overall performance of the filter.
The experimental study investigates the effects of wind speed, inlet temperature, heating temperature, and filtering material mass flow rate on the filtration efficiency for dust and sulfur removal. The experimental results show that heating the granular bed to 800°C with a wind speed of 30 cm/s achieves a sulfur removal efficiency of 98%. The dust removal efficiency can reach 98.3%. A better dust removal effect is observed at a mass flow rate of 150 g/min. Regarding desorption, a slower filtering material mass flow rate leads to an increased sulfur removal efficiency, attributed to the thorough heating of the filtering material inside the bed.
The study further examines the filtered material after sulfur adsorption. Under experimental conditions with bed heating temperatures of 600°C and 800°C, EDX component analysis reveals an increase in sulfur content from 0.13% to 1.11% in the filtering material, highlighting the importance of bed heating for desulfurization performance. A comparison of sulfur content between surface wind speeds of 30 cm/s to 45 cm/s shows higher sulfur content at 30 cm/s, indicating better desulfurization performance at lower wind speeds for the moving granular bed filter.
Keywords: Moving granular bed filter, High-temperature gas cleaning , Simultaneous dust and sulfur removal | en_US |