生物质燃气冷热电联供系统性能分析

为提高能源的利用效率,缓解传统能源短缺及其利用过程中带来的环境问题,设计了一种以内燃机为驱动装置的生物质燃气冷热电联供系统,对其能量流程进行了分析,并以北京市某面积为10 000 m2的宾馆为例,对该系统在热跟随和电跟随两种运行模式下的设备选型、燃料消耗量和补电量以及能效、经济和排放性能进行了分析比较。通过比较可知,联供系统在电跟随模式下比在热跟随模式下的一次能源利用率高4.3%,缩短投资回收期1.4年,但少减排254.9 t CO2。因此,该生物质气冷热电联供系统在热跟随模式下的环境效益较好,在电跟随模式下的能源效益和经济效益更佳。

Performance Analysis of a Biogas Combined Cooling Heating and Power System

In order to improve energy efficiency and to relieve shortage of fossil energy and environmental problems, a biogas combined cooling heating and power (CCHP) system driven by internal combustion engine was designed, and its energy flow was presented. As a case study, the biogas CCHP system for a hotel in Beijing, about 10000m2, was analyzed and compared in two operation modes: following the electrical loads (FEL) and following the thermal loads (FTL). The equipment configuration, fuel consumption and supplementary power and the energy, economic and emission performances were calculated and compared in the two operation modes. The results indicate that the primary energy rate (PER) of the CCHP system in FEL is 4.3% higher than in FTL; the investment payback period is 1.4 years shorter; and the CO2 emission reduction is 254.9t less. The biogas CCHP system in FTL has more environmental benefit and in FEL is more efficient and economical.