LNG/柴油双燃料发动机掺烧策略的试验分析

Experimental Study on Co-combustion Strategy of LNG/Diesel Dual Fuel Engine

针对LNG/柴油双燃料发动机的LNG燃料掺烧问题,以Z6170ZLCZ-19柴油机为原型机,采用增压器后单点进气方式进行改装,对掺烧策略进行试验研究。研究结果表明:在极低负荷区与重载超载区,不宜掺烧LNG燃料;在中低和中高负荷区,可适量掺烧LNG燃料;在中负荷区,双燃料发动机综合性能较好,适宜掺烧LNG燃料。将双燃料发动机工作范围划分为"禁止区"、"控制区"和"健康运行区",并对各个区域设置相应的替代率上限值,可较好地解决LNG的合理掺烧问题。

In view of the co-combustion problem about LNG fuel in LNG/diesel dual fuel engine, the Z617OZLCZ-19 prototype diesel engine was refitted with single-point injection after turbocharger method. And experimental research on co-combustion strategy was carried out. The results show that in the area of extremely low load , heavy load and over load, LNG fuel shouldn＇t be co-combusted; in the area of me- dium-low and medium-high load, LNG fuel can be appropriately co-combusted; in the area of medium load, the overall performance of LNG/diesel dual fuel engine is preferable, and LNG can be co-combust- ed. By dividing the working range of dual fuel engine into ＂ forbidden region＂ , ＂ control region＂ and ＂ healthy region＂ and setting upper limit of replacement rate corresponding to the three regions, the appro- priate co-combustion of LNG could be achieved.