煤炭與生質炭共氣化技術發展之可行性與經濟效益評估

Co-gasification of Coal and Biochar Blends Technology Development Feasibility and Economic Evaluation

沈政憲(Cheng-Hsien Shen) ； 徐恆文(Heng-Wen Hsu) ； 陳建華(Chien-Hua Chen) ； 許介寅(Jieh-Yn Sheu) ； 黃國恩(Kuo-En Huang)

《燃燒季刊》 81期 (2013/05) Pp. 56-71

https://doi.org/10.30041/CQ.201305_(81).0005

摘要

本研究針對煤炭與生質炭共氣化技術做一經濟性分析評估，分析結果顯示：（1）.生質物應以國內生產的稻殼為主；（2）.前處理方式建議以焙燒（240～250°C）方式處理木本植物，持溫時間為0.5小時為最佳；（3）.建議共氣化所添加的焙燒後生質物比例在5～15%之間；（4）.提高水煤漿進料濃度將有助於氣化效率的提升。藉由煤炭與生質物共氣化經濟可行性分析結果顯示：（1）.混拌生質物會造成燃料總成本增加；（2）.合成氣的熱值低；（3）.增加投資回收年限，因此為了增加共氣化技術可行性，建議可以採行降低生質炭處理成本，以利降低投資回收年限，並且配合實施徵收碳稅將有利於生質物與煤炭共氣化的發展。最後建議在國內發展生質物前處理技術，包括：焙燒、裂解和生質物共氣化技術等，並且及早往東南亞地區國家設置生質物前處理廠，以降低運輸成本和未來供應國內對於生質物的需求量。

關鍵字

生質炭 ； 前處理技術 ； 焙燒 ； 共氣化技術 ； 投資回收年限

並列摘要

The economic evaluation of co-gasification of coal and biochar blends showed:(1). mainly to the domestic production of rice husk as biomass. (2).the torrefraction (240~250°C) approach to woody with holding time of 0.5 hours is the best. (3). biochar addition between 5 to 15% is proposed. (4).cool gas efficiency can be incrased by improving coal-water slurry concentrations. Further evaluations indicate: (1).blending biochar with coal will cause the fuel cost to rise, (2).lower the heating value of syngas, (3).result in a longer payback period. To increase the feasibility of co-gasification application, it is suggested that reducing the biochar's cost from innovative pretreatment processes and lowering the payback period are esential for future work. With the implementation of carbon tax there will be incentive to the development of co-gasification of biochar and coal. Finally, it is recommended to develope domestic pretreatment technologies, including torrefractioning, pyrolysising and co-gasificationing. And invest on building pretreatment plants in the Southeast Asian countries to acquire the biomass supply for the domestic demand.

並列關鍵字

biochar ； pretreatment ； torrefraction ； co-gasification ； payback period