甜高粱茎秆固态发酵制取燃料乙醇中试项目经济评价

对建立在中国山东省威海市的甜高粱茎秆固态发酵制燃料乙醇中试项目工艺进行了描述，采用成本效益法对该项目进行了技术经济评价。该项目采用固态发酵法，乙醇转化率达到理论值的95.8%，剩余酒糟渣再进行发酵，获得含粗蛋白8%左右的发酵蛋白饲料。成本效益分析表明，无水乙醇的生产成本为5033.8元/t，蛋白饲料的生产成本为101元/t。现金流分析表明，当社会折现率取10%时，项目的净现值为281.75万元，内部收益率为16.05%；益本比为0.953，动态投资回收期为9～10 a，项目具有一定的获利能力。敏感性分析表明，内部收益率对产品价格和运行成本变化的敏感性最高，对初始投资的敏感性较低，在现有规模和工艺条件下，该项目的市场风险主要来自产品价格。

Techno-economic assessment on pilot-scale plant for fuel ethanol production from sweet sorghum stem by solid state fermentation

The technological process of pilot-scale plant for fuel ethanol production from sweet sorghum stem by solid state fermentation, which was set up in Weihai city, Shandong province of China, was described and techno-economic assessment of the plant was conducted with cost and profit analysis. Results showed that the ethanol conversion efficiency relative to theoretical yield was up to 95.8%. The residual vinasse was re-fermented and protein feed with 8% crude protein was obtained. The cost and benefit analysis showed that costs of absolute ethyl alcohol production and protein feed production were 5?033.8 yuan/t and 101yuan/t, respectively. Cash flow analysis showed that Net Present Value, Internal Return Rate and Profit/Cost of financial analysis in project level were 2?817.5 thousands yuan, 16.05% and 0.953, respectively when the social discount rate was 10%. And the dynamic pay-back period was 9-10 years. As a result, the project has a certain ability of making a profit. The sensitivity analysis showed that the sensitivity of IRR to changes of product price and operating cost was the highest and the sensitivity of IRR to initial investment was the lowest. The market risk of this project depends mainly on the product price at the current scale and technological conditions.