Development of efficient biomass conversion method combined oil dewatering and two-stage gasification at low temperature.

要有效地将生物质废弃物转化为能源，必须解决高含水量、材料质量变化、焦油析出等问题。本研究提出了一种油脱水与低温热解相结合的新方法，并对以下项目进行了详细的研究。1)湿质生物质脱水升级新方法的开发2)湿质生物质低温热解制气化催化剂首先考察了几种湿质生物质的脱水情况，明确了250℃水热处理与180℃油脱水相结合可获得热值高达35.5MJ/kg的改性生物质。该值与电厂原料高挥发分亚烟煤相当。其次，我们发现在Ca(OH)2浸渍热解生物质的过程中，焦油的含量受到限制，相反，焦油的含量增加。该炭具有很高的活性，可作为气化催化剂。最后，阐明了各产率与生物质H/C的关系，并提出了一种利用CHO图评价热解焦质量的新方法。因此，澄清了所提出的方法对于将湿生物质转化为能源和化学品是有用的。

To convert efficiently biomass wastes into energy, several problems such as high water content, quality change in material, tar evolution, etc. should be qualified. In this study, we proposed a new method combined oil dewatering and low temperature pyrolysis, and examine in detail the following items.1) Development of a new dewatering and upgrade method for wet biomass2) Production of gasification catalyst from wet biomass though low temperature pyrolysisFirst, we examine the dewatering of several wet biomass, and then clarified that the combination of the hydrothermal treatment at 250 C and the oil dewatering at 180 C brought about an excellent modified biomass having a high calorific value of 35.5MJ/kg. The value was comparable to that of high volatile sub-bituminous coal, which is used as a material of power plant.Secondly, we found that the tar was restricted, on the contrary chat increased during the pyrolysis biomass by impregnating Ca(OH)2. The char was very active, and utilized as a gasification catalyst.Finally, we clarified the relationship between each yield and H/C of biomass, and a new method for estimating the quality of pyrolyzed char utilizing CHO chart.Thus, it was clarified that the proposed methods were useful for converting wet biomass into energy and chemicals.