过量空气系数对沼气内燃机-ORC系统性能的影响  

The Influence of Excess Air Ratio on the Performance of the ICE-ORC System

作　　者：李金平[1] 汪秋刚 周正清[1] 

机构地区：[1]兰州理工大学西部能源与环境研究中心,甘肃兰州730050

出　　处：《热能动力工程》2016年第8期38-43,122,共6页Journal of Engineering for Thermal Energy and Power

基　　金：国家"863"计划课题(2014AA052801);甘肃省杰出青年基金资助项目(2012GS05601);甘肃省建设科技攻关基金资助项目(JK2010-29)

摘　　要：为改善沼气内燃机-ORC(有机朗肯循环)联合循环系统的性能,研究了过量空气系数的影响。建立了内燃机-ORC联合循环系统数值模型,在理论空燃比和过量空气系数分别为1.1、1.2、1.3、1.4、1.5、1.6下用不同甲烷体积分数的沼气进行了模拟计算。通过模拟分析得出:在一定范围内,增大过量空气系数能够提高联合循环系统的热效率,但随着沼气中甲烷体积分数的增大,有利于提高联合循环系统热效率的过量空气系数的范围越小;当过量空气系数相同时,联合循环系统热效率随甲烷体积分数的增大而增加。In order to improve the performance of the ICE-ORC combined cycle system,the influence of excess air ratio was studied. A numerical model of the ICE-ORC combined cycle system was established and related simulations was done for different methane concentrations of biogas with the theoretical air-fuel ratio / excess air ratio from 1. 1 to1. 6. The simulation results showed that the increase in excess air ratio can enhance the thermal efficiency of the combined cycle system within certain ranges. The larger the methane concentration of the biogas is,the smaller the range of the excess air ratio that can enhance the system thermal efficiency will be. With the same excess air ratio,the system thermal efficiency will be improved with the increase of methane concentration of biogas.

关 键 词：内燃机-ORC 过量空气系数 系统热效率 甲烷体积分数 

分 类 号：TK43[动力工程及工程热物理—动力机械及工程]