EGR strategy for DME engine‐out NOx to meet euro V

Abstract

In this article, a 2102QB diesel engine was retrofitted to run on DME. The effects of EGR on the DME engine power output, DME fuel consumption, and emission characteristics were investigated. Experimental results show that, DME engine power and fuel economy are both improved. The stoichiometric air/fuel ratio of DME is 9/1. DME engine can run properly if the air/fuel ratio is leaner than that due to the introduction of EGR. Only under fuel rich conditions, DME engine power output, fuel economy, HC and CO emissions become worse. NOx emissions can be reduced easily by the use of EGR.Based on the experimental data, the specific NOx emissoin was calculated and then it was used to set the rate of EGR under the ESC 13 operating conditions. By the designed EGR strategies, the DME engine NOx emissions under ESC operating conditions meets the requirement of Euro IV and V. At the mean time, HC and CO emissions of the DME engine were evaluated. The increase of CO and HC emissions require oxidation after treatment to meet their own standards.

Experimental study of effects of exhaust gas recirculation and combustion mode on combustion, emission, and performance of DME‐methanol ‐fueled turbocharged c ommon‐rail engine

“…EGR is thought to be a midtier NOx reduction strategy. 19,20 By adopting EGR, the NOx emissions of DME engines could meet Euro IV and V. 21 Another strategy to suppress the generation of NOx emissions is the clean combustion mode, that is, HCCI combustion, PCCI combustion, and P-PCCI combustion. Kim 22 investigated the strategy of NOx reduction for DME engines, and PCCI and P-PCCI combustions were adopted in the experiments.…”

Effects of gasoline fumigation on exhaust emission and performance characteristics of a diesel engine with mechanically‐controlled fuel injection pump

“…Thus, international consciousness for environment protection is growing to reduce such emission from diesel engine vehicles [1][2][3][4]. In this regard, new technologies, such as exhaust gas recirculation [5], aftertreatment [6][7][8][9][10], strategies related to renewable fuels [11][12][13][14], and new combustion modes including homogeneous charge compression ignition (HCCI) [15], partially premixed compression ignition (PPCI) [16][17][18], reactivity controlled compression ignition (RCCI) [19][20][21], are being considered as effective step to reduce the greenhouse gas, PM, and NO x emission from diesel-powered engines.…”

Experimental investigation on soot formation in an ethylene/air laminar diffusion flame diluted with CO2 at pressures up to 8 atm

“…Exhaust gas recirculation (EGR) is one of the effective ways of controlling exhaust pollutions (such as nitric oxide (NO x ), soot, etc.) in compression ignition engines . Even though there have been developments in the mechanisms of NO x formation and its reduction methods , there are still many ambiguities in the explanations of soot emission due to various complex changes .…”