本研究乃探討多孔性介質(PM)輔助生質衍生氣體(BDG)進行自發熱乾重組之超焓特性研究。此設計概念乃藉由多孔介質熱傳遞機制來預熱反應氣體，配合觸媒催化來提高富氫合成氣之產率，並藉由觸媒床內部熱回饋特性，來進行超焓(Excess enthalpy)重組反應。實驗過程中，也藉由觸媒填充床可視化影像觀測、紅外線熱影像觀測、產物濃度分析與多孔介質介面溫度量測來進行交互比對，有助於了解觸媒填充床溫度分佈與觸媒反應區的火焰位置。並可配合實驗參數設定來了解多孔介質於混成式觸媒反應流床之熱傳遞特性、快速冷起動與可操作範圍。控制參數可分為CO2/CH4比、O2/CH4比、觸媒選用、觸媒入口溫度、空間速度與多孔性介質規格選用等。實驗結果證實，自發熱乾重組反應不但可自持重組反應過程所需熱量，又可避開積碳區間以維持穩定的合成氣體產出，且參數設定下多孔介質-觸媒流床混成式設計皆可達到超焓重組反應。並由實驗測試結果也可發現，Pt-Ru/Al2O3觸媒於二氧化碳重組反應有較佳之活性。也藉由軸向溫度量測與觸媒流床影像觀測得知，多孔性介質輔助更有助於反應室內部流場重新分配，降低觸媒入口端之徑向溫度梯度與提高反應物混合程度，且熱量都可以穩駐於重組反應區段，進而有效提高火焰傳播速度與火焰穩定性。經實驗反覆測試過後發現，多孔性介質材料以耐熱震性較佳的OBSiC (Oxide-bonded silicon carbide)為最適合重組反應之進行。此外，也藉由二氧化碳自發熱乾重組反應之可操作邊界得知，重組參數之可操作區間主要受限於積碳反應區間(Carbon formation zone)、吸熱反應區間(Endothermic reaction zone)與觸媒燒結區間(Catalyst sintering zone)。因此參數選用上仍以較高的重組效率與較低的能量損失為目標，故本研究選用O2/CH4比為0.7-0.9之間為重組區間，重組效率最高可達79.5%，能量損失介於12.7-24.6%之間。最後，經實驗結果也證實多孔介質-觸媒混成式設計能有效改善反應過程之重組效率，未來不但可配合定置型二氧化碳排放源直接進行熱化學轉化，更有助於即時轉化移動式載具之汙染排放源。

Dry auto-thermal reforming (DATR) from biomass derived gas (BDG) under excess enthalpy design concepts with porous medium (PM) is investigated in this study. The reaction zone of the porous media arrangement combines the benefits from both porous media and catalyst, such as enhancing the preheating reactant by heat transfer and improving hydrogen-rich syngas production with the surface reaction of the catalyst. Therefore, the excess enthalpy on reforming reaction could be achieved by internal heat recirculation. In the experimental process. It is used by photographic observation, infrared thermal image analysis, products concentration analysis and temperature measurements in catalyst packed-bed by obtaining temperature distribution and images information. The experimental was also matched with the control parameters to understand the heat transfer path, rapid cold processing and operational range of DATR in PM-catalyst hybrid packed-bed. Controlled parameters included CO2/CH4, O2/CH4, catalyst specification, catalyst inlet temperature, gas hourly space velocity and porous medium specification. The experimental results demonstrated that it not only supplied the energy required for self-sustained reaction, but also avoided the coke formation by dry auto-thermal reforming. It has a wide operation region to maintain the moderate production of the syngas. Moreover, the reforming reaction with the hybrid reformer could achieve excess enthalpy under the tested parameters. Therefore, the temperature measurement along the axial position and image observation of the catalyst packed-bed indicated that the porous media arrangement may have been helpful to the uniformity of gas distribution to decrease the gradients of temperature and concentration in the reaction chamber. The peak temperature can thus be stabilized at the interface of the PM and catalyst bed, significantly improving the propagation and stability of the flame. OBSiC (Oxide-bonded silicon carbide) with excellent thermal shock resistance was selected for the excess enthalpy reforming reaction. Furthermore, the operational boundary of DATR indicates that the reforming parameters are primarily limited to the carbon formation zone, the endothermic reaction zone, and the catalyst sintering zone. Operational boundaries are also slightly offset with the heat release rates. Therefore, the selection of the parameters was determined to achieve high reforming efficiency and low energy loss percentage. The results showed that the energy loss percentage was between 12.7% to 24.6% and reforming efficiency was between 64.4% to 79.5% with the best reforming parameter settings (O2/CH4=0.7 to 0.9 and CO2/CH4=0.0 to 2.0). Finally, the experimental results demonstrated that PM-catalyst hybrid design can improve reforming efficiently. It can be applied to set-based thermal power systems and convert the pollution emissions (CO2-rich gas) of mobile vehicles in real time.

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