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对两种生物质精炼技术(黑液木素酸析沉淀分离技术,近中性条件下的半纤维素预抽提技术)的经济性评价进行了解释。采用WinGEMS软件绘制了制浆流程模型,用于计算质量和能量平衡。采用标准成本估测方法对投资成本、操作成本和两种生物质精炼技术的收益性进行了计算。结果显示:两种生物质精炼技术对所研究案例都有较好的经济性,并可以有效解决回收系统问题。根据评估可知,木素沉淀分离技术的税后内部回报率为95%,而半纤维素预抽提技术为28%。灵敏度分析表明:在所选择参数的灵敏度发生变化时,木素沉淀分离技术的税后内部回报率仍高于半纤维素预抽提技术。以税后内部回报率和成本额作为标准进行估测的结果表明:对所研究的浆厂而言,木素沉淀分离技术比近中性半纤维素预抽提技术更有前景。然而,对两种生物质精炼技术的评价还应该包括长期评估标准的比较。从木素沉淀工艺中分离得到的木素可以用于开发高附加值产品,或者用半纤维素预抽提液制取乙醇和醋酸,这些产品都应作为参考的指标,从而选择更合适的工艺技术。
The economic evaluation of two biomass refining technologies (black liquor lignocellulose acid precipitation separation technology, pre-extraction of hemicellulose under near-neutral conditions) was explained. The pulping process model was drawn using WinGEMS software to calculate mass and energy balance. Standard cost estimates were used to calculate investment costs, operating costs, and profitability of two biomass refining technologies. The results showed that the two kinds of biomass refining technology have good economy to the studied cases and can effectively solve the problem of recovery system. According to the assessment, the after-tax internal rate of return of lignin precipitation separation technology is 95%, while the hemicellulose pre-extraction technology is 28%. Sensitivity analysis shows that the after-tax internal rate of return of lignin precipitation is still higher than that of hemicellulose pre-extraction when the sensitivity of selected parameters changes. The results of the tax after-tax internal rate of return and the cost estimate show that the lignin precipitation separation technique is more promising than the near-neutral hemicellulose pre-extraction technique for the pulp mill studied. However, the evaluation of both biomass refining technologies should also include comparisons of long-term assessment criteria. The lignin isolated from the lignin precipitation process can be used to develop high value-added products or ethanol and acetic acid from hemicellulose pre-extraction solutions, all of which should be used as a reference to select a more appropriate process technology.