生物质气对内燃机发电机组特性影响的实验研究

Experimental research on the influence of biomass gas on the characteristics of the internal combustion engine generator system

文章以30 kW生物质气内燃机发电机组为研究对象,通过改变CO,H_2,CH_4,CO_2等组分的比例配制气体,来模拟不同生物质气,并分析生物质气组分和热值对内燃机发电机组启动特性和发电特性的影响。分析结果表明:CO_2的阻燃效果显著,CO_2的比例升高会阻碍内燃机的点火启动,导致内燃机组无法正常工作;H2的助燃效果显著,提高H2的比例可以改善内燃机组的启动特性和发电特性;内燃机组的最大输出功率随着生物质气热值的增加而上升,当生物质气的热值大于6.75 MJ/m3时,内燃机组可以达到额定输出功率(30 kW);当生物质气热值相同时,降低CO_2比例或提高H_2比例,内燃机组的做功能力将会增强;内燃机组的发电效率随着输出功率的增加而升高,燃气消耗率随着输出功率的增加而降低。

A 30 kW biomass gas internal combustion engine generating system is used as the experimental object. The proportion of CO,H2,CH4 and CO2 has been changed to simulate different biomass gas. The influence of proportion and calorific value on the characteristics of the internal combustion engine system has been analysed. The results show that the increase of CO2 will inhibit the ignition start of the internal combustion engine, resulting in the failure of the internal combustion engine to work normally, and its flame retardant effect is obvious. On the contrary, combustion effect of H2 is very superior. The increase of H2 content can improve ignition characteristics and power generation characteristics of the internal combustion system. The maximum output power of the system rises with the increase of calorific value. And when the calorific value is greater than 6.75 MJ/m3, the internal combustion system can drive up to 30 kW load. In the same calorific value, reducing CO2 proportion and raising H2 proportion will increase the capacity of the internal combustion system to carry more load. The power generation efficiency of internal combustion system rises with the increase of output power while the gas consumption rate decreases with the increase of output power.