Impact of natural gas injection strategies on combustion and emissions of a dual fuel natural gas engine ignited with diesel at low loads

Fuel ◽  
2020 ◽  
Vol 260 ◽  
pp. 116414 ◽  
Author(s):  
Jinwen You ◽  
Zhongchang Liu ◽  
Zhongshu Wang ◽  
Dan Wang ◽  
Yun Xu
Keyword(s):  
Natural Gas ◽  
Gas Injection ◽  
Dual Fuel ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Injection Strategies

scholarly journals Micro-pilot-induced Ignition Diesel/ Natural Gas Engine Control System Development and Engine Performance /Emission Optimization

2018 ◽  
Author(s):  
G Zhao
Keyword(s):  
Control System ◽  
Natural Gas ◽  
Gas Injection ◽  
Injection Pressure ◽  
Dual Fuel ◽  
Injection Timing ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Driving Circuit ◽  
Injection Ratio

Diesel/natural gas dual fuel engine is acquiring more and more attention due to its potential to reduce NOX and soot emission simultaneously. Micro-pilot-induced diesel ignition natural gas engine is a popular manner to further improve the emission reduction capability of dual fuel engine. A six cylinder, four stroke, commonrail diesel engine is converted into dual fuel engine. Natural gas is injected into the intake manifold after the throttle. Five gas injection valves are used to control natural gas flow rate. Based to the established fuel supply system, a dual fuel control system is developed by using MS9S12XEP100 MCU. Voltage boosting circuit, fuel injector driving circuit, gas injection valve driving circuit and MeUn driving circuit are integrated on the platform of MCU hardware. Two ECU is connected to each other by CAN bus and several I/O ports to fulfil the fuel injection functional requirement. A software framework involves gas injection timing synchronization, fuel mode managing, multi-time injection. A MAP based fresh air mass flow rate and intake charge efficiency model is integrated in the MCU to calculate the fresh air quality in cylinder. The last part is performance optimization research at low load. Ignition diesel is divided into two stages, and the first injection timing, first injection ratio and injection pressure are used as controllable parameter to reduce NOX and HC emission. Experimental result reveal that by dividing ignition injection into two stage and advancing first injection to 60°CA BTDC CH4 emission can be reduced by 77% while NOX remains unchanged. Increasing the first injection ratio and injection pressure can also reduce THC emission. If injection pressure is higher than 75MPa, the effect of HC reduction effect is not that obvious. Experimental results shows that developed control system can accomplish the functional requirements of dual fuel engine management. Emission test results demonstrate that IMO TierII can be satisfied at diesel mode. DF mode emission performance can meet the requirement of IMO TierIII. Furthermore, as the first domestic product dual fuel dedicated control system, which has passed through the CCS authentication in China, the engine emission level can meet the current and upcoming China’s emission standard on non-road engine on the premise of guaranteeing engine power and economy.

An Experimental-Numerical Approach to Reduce Emissions of a Dual Fuel Diesel-Natural Gas Engine

2009 ◽  
Author(s):  
S. Cordiner ◽  
V. Mulone ◽  
V. Rocco ◽  
R. Scarcelli ◽  
S. Iannaccone ◽  
...  
Keyword(s):  
Natural Gas ◽  
Numerical Approach ◽  
Dual Fuel ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Reduce Emissions

Effect of Injection Strategies on Emissions from a Pilot-Ignited Direct-Injection Natural-Gas Engine- Part I: Late Post Injection

2017 ◽  
Author(s):  
Ethan Faghani ◽  
Pooyan Kheirkhah ◽  
Christopher W.J. Mabson ◽  
Gordon McTaggart-Cowan ◽  
Patrick Kirchen ◽  
...  
Keyword(s):  
Natural Gas ◽  
Direct Injection ◽  
Post Injection ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Engine Part ◽  
Injection Strategies

scholarly journals The Study on Dual Fuel Spray and Characteristics of Combustion of Diesel, Natural Gas and Dual Fuel

2018 ◽  
Vol 1 (1) ◽  
pp. 14-30
Author(s):  
Tasneem Abdalla Tasneem Abdalla ◽  
Tasneem Abdalla Tasneem Abdalla ◽  
Qian Wang ◽  
Qian Wang ◽  
Tan Xiaoqiang ◽  
...  
Keyword(s):  
Natural Gas ◽  
Heat Production ◽  
Diesel Fuel ◽  
High Speed ◽  
Initial Pressure ◽  
Dual Fuel ◽  
Schlieren Method ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Combustion Emissions

Combustion of fossil fuels provides around 88% of total energy supply for modern society, and meanwhile causes many environ mental problems and social problems such as air pollution and energy crisis. Therefore，both at home and abroad are focusing on the research and development of natural gas engine recently. However, the mass production and application of this kind of engine are restricted by some unsolved technical difficulties. This paper explored the injection, combustion and emission processes of diesel/ natural gas and dual fuel engine based on Chemkin II, Fire software and Schlieren method. The experimental study on the mixing process of dual fuel jet was carried out by using high-speed Schlieren method in a constant volume bomb. Based on the Fire software, and then applied to Chemkin II software to analyze the effect of the initial temperature and pressure on the net heat production and combustion emissions. The results show that Dual fuel mechanism is capable of producing different heat production behaviors when varying the initial pressure and temperature CO2 emissions are minimized by changing the initial pressure above or below the atmospheric value. However, CO emissions are peaked when diesel fuel is used. The dual fuel engine minimizes the CO emissions amount caused by diesel fuel. Increasing the initial pressure eliminates dual fuel CO2 combustion emissions. The research of this paper is important to optimize the in cylinder combustion processes of natural gas engine, and have a certain important meaning to guide the development of diesel ignition dual fuel engine.

Effect of Port Gas Injection on the Combustion Instabilities in a Spark-Ignition Lean-Burn Natural Gas Engine

2018 ◽  
Vol 28 (10) ◽  
pp. 1850124
Author(s):  
Li-Yuan Wang ◽  
Li-Ping Yang ◽  
En-Zhe Song ◽  
Chong Yao ◽  
Xiu-Zhen Ma
Keyword(s):  
Natural Gas ◽  
High Frequency ◽  
Gas Injection ◽  
Low Frequency ◽  
Combustion System ◽  
Combustion Instabilities ◽  
Lean Burn ◽  
Engine Load ◽  
Gas Engine ◽  
Natural Gas Engine

The combustion instabilities in a lean-burn natural gas engine have been studied. Using statistical analysis, phase-space reconstruction, and wavelet transforms, the effect of port gas injection on the dynamics of the indicated mean effective pressure (IMEP) fluctuations have been examined at a speed of 800[Formula: see text]rpm and engine load rates of 25% and 50%. The excessive air coefficient is 1.6 for each engine load, and the port gas injection timing (PGIT) ranges from 1 to 120 degrees of crankshaft angle ([Formula: see text]CA) after top dead center (ATDC) of the intake process. The results show that the PGIT has a significant effect on cyclic combustion fluctuations and the dynamics of the combustion system for all studied engine loads. An unreasonable PGIT leads to increased combustion fluctuations, and loosened and bifurcated structures of combustion system attractors. Furthermore, for both low and medium engine loads, the IMEP time series at earlier gas injections ([Formula: see text]CA and [Formula: see text]CA ATDC) undergoes low-frequency fluctuation together with high-frequency fluctuations in an intermittent fashion. For other PGITs, high-frequency intermittent fluctuations become persistent combined with weak low-frequency oscillations. Our results can be used to understand the oscillation characteristics and the complex dynamics of combustion system in a lean-burn natural gas engine. In addition, they may also be beneficial to the development of more sophisticated engine control strategies.

Effect of Double-Layer Hole Nozzle with Narrow Spray Angle on Combustion and Emissions in Dual-Fuel Natural Gas Engine

2021 ◽  
Author(s):  
Jinbao Zheng ◽  
Zhoayang Hao ◽  
DuiDui Wang ◽  
Yage Di ◽  
Haiyong Peng ◽  
...  
Keyword(s):  
Natural Gas ◽  
Double Layer ◽  
Spray Angle ◽  
Dual Fuel ◽  
Gas Engine ◽  
Natural Gas Engine

Improvement of Performance and Exhaust Emissions in a Converted Dual-Fuel Natural Gas Engine

2000 ◽  
Author(s):  
Takuji Ishiyama ◽  
Masahiro Shioji ◽  
Shin-ichi Mitani ◽  
Hiroaki Shibata ◽  
Makoto Ikegami
Keyword(s):  
Natural Gas ◽  
Exhaust Emissions ◽  
Dual Fuel ◽  
Gas Engine ◽  
Natural Gas Engine
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