Study on Energy Technology of Marine Turbocharged Diesel Engine under Low-Load Conditions

2012 ◽  
Author(s):  
Zhan Li ◽  
Min Li
Keyword(s):  
Diesel Engine ◽  
Energy Technology ◽  
Turbocharged Diesel Engine ◽  
Low Load ◽  
Load Conditions

Study on the Effect of Fuel Sulfur Content on Emission Characteristics in Diesel Engine

2014 ◽  
Vol 577 ◽  
pp. 27-30 ◽  
Author(s):  
An Kang Wu ◽  
Xiang Dong Yang ◽  
Hua Zhou ◽  
Ke Jiu Lu
Keyword(s):  
Diesel Engine ◽  
Sulfur Content ◽  
Direct Injection ◽  
Emission Characteristics ◽  
Smoke Emission ◽  
Turbocharged Diesel Engine ◽  
Low Load ◽  
Significant Change ◽  
Hc Emissions

In a direct injection turbocharged diesel engine, four fuels with different sulfur content is used to study the effects of emission characteristics in diesel engine. Results show that the smoke emission have certain relations with sulfur content on fuel, the smoke emission decreases remarkably with the decreases of fuel sulfur content, and the sulfur content on fuel has a greater influence on the smoke emission at low load of the diese1 engine, the NOxemissions has no significant change when the engine fuelled with different sulfur content on fuel, while the CO and HC emissions will drop significantly.

scholarly journals Experimental Study on the Effects of Air Supply Control on Combustion and Emissions Performance at Medium and Low Load for a Dual-Fuel Diesel Engine

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2944 ◽  
Author(s):  
Yu-Hui Peng ◽  
Yu-Peng Huang ◽  
Jia-You Tang ◽  
Qi-Feng Huang ◽  
Yi-Ran Huang
Keyword(s):  
Diesel Engine ◽  
Fuel Efficiency ◽  
Specific Energy Consumption ◽  
Fuel Mixture ◽  
Dual Fuel ◽  
Compression Ignition Engines ◽  
Excess Air ◽  
Air Supply ◽  
Low Load ◽  
Load Conditions

Lowering the amount of excess air is believed to increase the density of the air-fuel mixture and help improve the combustion rate for compression ignition engines. This paper proposes an approach of adding a throttle body at the intake pipe to control the excess air ratio with reduction of air supply to achieve a better balance between the power, emissions and fuel efficiency at medium and low load of a natural gas dual-fuel diesel engine converted from a conventional diesel engine. Various experiments in both pure diesel and dual-fuel mode under intermediate engine speed are performed with the proposed critical method of excess air ratio control. The experimental results reveal that better excess air ratio is very beneficial for the power output and brake specific energy consumption in dual-fuel combustion under medium and low load conditions. Moreover, the substitution rate can reach as high as 40% under low load conditions with throttle control.

scholarly journals Effects of Two Pilot Injection on Combustion and Emissions in a PCCI Diesel Engine

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1651
Author(s):  
Deqing Mei ◽  
Qisong Yu ◽  
Zhengjun Zhang ◽  
Shan Yue ◽  
Lizhi Tu
Keyword(s):  
Diesel Engine ◽  
Combustion Process ◽  
Exhaust Gas ◽  
Pilot Injection ◽  
Compression Ignition ◽  
Ignition Timing ◽  
Turbocharged Diesel Engine ◽  
Injection Quantity ◽  
Low Load ◽  
Gas Recirculation

The effects of two pilot injections on combustion and emissions were evaluated in a single−cylinder turbocharged diesel engine, which operated in premixed charge compression ignition (PCCI) modes with multiple injections and heavy exhaust gas recirculation under the low load by experiments and simulation. It was revealed that with the delay of the start of the first pilot injection (SOI−P1) or the advance of the start of second pilot injection (SOI−P2), respectively, the pressure, heat release rate (HRR), and temperature peak were all increased. Analysis of the combustion process indicates that, during the two pilot injection periods, the ignition timing was mainly determined by the SOI−P2 while the first released heat peak was influenced by SOI−P1. With the delay of SOI−P1 or the advance of SOI−P2, nitrogen oxide (NOx) generation increased significantly while soot generation varied a little. In addition, increasing Q1 and decreasing the second pilot injection quantity (Q2) can manipulate the NOx and soot at a low level. The advance in SOI−P2 of 5 °CA couple with increasing Q1 and reducing Q2 was proposed, which can mitigate the compromise between emissions and thermal efficiency under the low load in the present PCCI mode.

Sign in / Sign up

Export Citation Format

Share Document