膜法沼气纯化系统的技术经济分析

Techno-economic evaluation of membrane-based biogas upgrading systems

针对我国主要的10万t污水处理厂100 m^3/h的沼气,利用Matlab进行了二段膜法纯化系统的设计,并用运行生产能力指数法进行了技术经济分析。结果表明,100 m^3/h的二段膜法沼气纯化系统总投资费用为84.9万元,年运行费用为34.8万元,单位处理能力投资为8 500元/(m^3·h),单位沼气处理成本为0.35元/m^3。膜组件和压缩机费用为最主要的投资成本,压缩机电耗为最主要的运行成本。处理规模从100 m^3/h提高到1 000 m^3/h时,膜系统的单位处理能力投资和单位处理成本均显著下降。操作压力增高,膜使用面积显著降低,但压缩机费用增大,功耗增加。

Two-step membrane-based biogas upgrading systems are investigated for 10 thousand tons of waste water treatment plants（ WWTPs）. The system is designed by Matlab and evaluated in the perspective of technic and economic by production capacity index method. The results show that,gross capital cost of the 100 Nm^3/ h two-step membranebased biogas upgrading system is 849 thousand yuan. Annual total processing is 348 thousand yuan. The specific capital cost is 8. 5 thousand yuan /（ Nm^3/ h raw biogas）. The specific processing cost is 0. 35 yuan / Nm^3. Membrane modules and compressor cost are the main capital cost,while the electricity is the main processing cost. The specific capital cost and processing cost are significantly decreased,when the processing scale of the system is increased from 100 Nm^3/ h to 1 000Nm^3/ h. The compressor cost and electricity consumption increase with the increase of operation pressure. Meanwhile,the membrane area decreases dramatically.