甲烷輻射熱裂解是一種無碳排放的產氫方式。過程中產生的碳為固體，不會產生一氧化碳和二氧化碳等溫室氣體，同時產生的碳顆粒還具有高附加經濟價值。甲烷輻射熱裂解於21世紀前便有許多相關研究，其中碳沉積問題致使甲烷輻射熱裂解在產氫工業上仍有不少問題需要克服。本研究對甲烷輻射熱裂解反應器進行模擬分析，使用商用數值軟體ANSYS FLUENT對陶瓷多孔介質提升反應器性能提升影響進行分析比較。 研究發現反應器性能主要受到反應器腔體高溫區域範圍大小影響，比較10PPI二氧化鋯、10PPI碳化矽、20PPI二氧化鋯和20PPI碳化矽的圓柱形陶瓷多孔介質對反應器甲烷轉換率影響，發現20PPI有最高的甲烷轉換率79%，同時增加陶瓷多孔介質後會使流體以活塞流的流動方式經過陶瓷多孔介質，並大幅提升碳顆粒滯留時間。 ;Methane radiant thermal cracking is a hydrogen production method that does not emit carbon. The carbon produced in this process is solid and does not result in greenhouse gases such as carbon monoxide and carbon dioxide. Additionally, the carbon particles generated have high economic value. Numerous studies on methane radiant thermal cracking were conducted before the 21st century; however, carbon deposition issues have posed several challenges that need to be overcome for its application in the hydrogen production industry. This research conducts a simulation analysis of a methane radiant thermal cracking reactor using the commercial numerical software ANSYS FLUENT to analyze and compare the effects of ceramic porous medium on enhancing reactor performance. The study found that the reactor performance is primarily influenced by the size of the high-temperature region within the reactor cavity. By comparing the effects of cylindrical ceramic porous medium made of 10 PPI zirconia, 10 PPI silicon carbide, 20 PPI zirconia, and 20 PPI silicon carbide on the reactor′s methane conversion rate, it was found that 20 PPI materials achieved the highest methane conversion rate of 79%. Additionally, the incorporation of ceramic porous medium caused the fluid to flow through the medium in a plug flow, significantly increasing the resident time of methane.
