CAJ | 학술논문

以厌氧发酵生物气为原料生产压缩天然气是大规模利用生物质资源的重要途径。首先，在过程模拟软件UniSim Design中基于有限元方法建立了中空纤维膜的离散数值计算模型，适合于模拟渗透切割比非常高的生物甲烷膜分离过程。以单级聚酰亚胺膜分离系统为例研究了关键操作条件--膜的进料压力对处理能力、甲烷收率及压缩天然气生产单耗的影响。目前的评估体系下，提高进料压力有利于提高处理能力和甲烷回收率，而压缩天然气生产单耗在2.70 MPa时最低，为0.46 kW·h·m-3压缩天然气。通过分析渗透气的甲烷浓度变化趋势，开发了一级二段气体膜分离系统，兼具流程简单、设备投资低、甲烷收率高、产值高的优点。以处理1000 m3·h-1生物气为例，甲烷收率达95.0%，压缩天然气产量500 m3·h-1。对应地，装置总投资为3.8×106 CNY，年运行费用及设备折旧为1.5×106CNY，年经济效益（毛利）超过2.50×106 CNY。
이염양발효생물기위원료생산압축천연기시대규모이용생물질자원적중요도경。수선，재과정모의연건UniSim Design중기우유한원방법건립료중공섬유막적리산수치계산모형，괄합우모의삼투절할비비상고적생물갑완막분리과정。이단급취선아알막분리계통위례연구료관건조작조건--막적진료압력대처리능력、갑완수솔급압축천연기생산단모적영향。목전적평고체계하，제고진료압력유리우제고처리능력화갑완회수솔，이압축천연기생산단모재2.70 MPa시최저，위0.46 kW·h·m-3압축천연기。통과분석삼투기적갑완농도변화추세，개발료일급이단기체막분리계통，겸구류정간단、설비투자저、갑완수솔고、산치고적우점。이처리1000 m3·h-1생물기위례，갑완수솔체95.0%，압축천연기산량500 m3·h-1。대응지，장치총투자위3.8×106 CNY，년운행비용급설비절구위1.5×106CNY，년경제효익（모리）초과2.50×106 CNY。
The production of compressed natural gas (CNG) from anaerobic fermentation gas is an important way for large scale use of biomass resources. A discrete simulation model for hollow fiber membrane is established by the finite element method in the process software UniSim Design, which is suitable for membrane separation with high permeation stage cut to purify bio-methane. The key operation condition, membrane feed pressure, which affects membrane process capacity, methane recovery ratio and CNG specific energy consumption, is studied by simulating the single-stage separation process of polyimide membranes. In this system, process capacity and methane recovery ratio are improved by increasing membrane feed pressure, but the lowest specific energy consumption is 0.46 kW·h·m-3 at membrane feed pressure of 2.70 MPa. After analyzing the change of methane content in permeate, a single-stage two-step membrane process is developed, with the advantages of compact process structure, low equipment investment, high methane recovery ratio and high production profit. For processing 1000 m3·h-1 feedstock, the methane recovery ratio is higher than 95%, with 500 m3·h-1 CNG yielded. The overall investment is 3.8×106 CNY, annual operation and depreciation cost is 1.5×106 CNY, and the annual gross economic profit can be 2.5×106 CNY at least.