摘要
从系统熵和火用的角度,对传统方式发电和燃料电池发电机理进行热力学分析,通过对两种发电过程中的火用损、熵增以及热力学效率的比较得出:传统发电装置在发电过程中,高温烟气在推动热机做功发电之前,由于升高自身温度所耗能量已造成较高的火用损;而燃料电池将燃料的化学火用,即吉布斯自由能直接转化为电能,火用损失明显减少,提高了热力学效率,因此燃料电池发电技术具有较为明显的优势。
The thermodynamic analysis of power generation mechanism with conventional mode and fuel cell is conducted from aspects of the system＇s entropy and exergy. It is concluded from a compar- ison of exergy loss, entropy increment and thermodynamic efficiency in the two processes of power generation that in the process of power generation performed by the conventional device, high-temperature flue gas has a higher exergy loss due to energy consumption for rising self-temperature before drive thermal machine to do work for power generation, while the fuel cell directly converts the chemical exergy of the fuel i. e. Gibbs free energy to power energy, the exergy loss is significantly reduced, and the thermodynamic efficiency is improved. Thus, the fuel cell power generation technology has a remarkable dominant position.
出处
《煤气与热力》
2007年第4期41-43,共3页
Gas & Heat
关键词
燃料电池
传统发电装置
热力学分析
热力学效率
fuel cell
conventional power generation device
thermodynamic analysis
thermodynamic efficiency
