Experimental study on the performance of a liquefied petroleum gas engine according to the air fuel ratio

Fuel ◽  
2021 ◽  
Vol 303 ◽  
pp. 121330
Author(s):  
Seungchul Woo ◽  
Juho Lee ◽  
Kihyung Lee
Keyword(s):  
Experimental Study ◽  
Liquefied Petroleum Gas ◽  
Gas Engine ◽  
Fuel Ratio

DEVELOPMENT OF THE COMBUSTION CHAMBER OF GAS ENGINE, CONVERTED ON THE BASIS OF DIESELS D-120 OR D-144 ENGINES TO WORK FOR ON LIQUEFIED PETROLEUM GAS

2019 ◽  
pp. 2-8
Author(s):  
Serhii Kovalov
Keyword(s):  
Combustion Chamber ◽  
Compression Ratio ◽  
Diesel Engines ◽  
Combustion Engine ◽  
Motor Fuel ◽  
Liquefied Petroleum Gas ◽  
Gas Engine ◽  
Chamber Volume ◽  
Motor Fuels ◽  
Dynamic Cycle

The expediency of using vehicles of liquefied petroleum gas as a motor fuel, as com-pared with traditional liquid motor fuels, in particular with diesel fuel, is shown. The advantages of converting diesel engines into gas ICEs with forced ignition with respect to conversion into gas diesel engines are substantiated. The analysis of methods for reducing the compression ratio in diesel engines when converting them into gas ICEs with forced ignition has been carried out. It is shown that for converting diesel engines into gas ICEs with forced ignition, it is advisable to use the Otto thermo-dynamic cycle with a decrease in the geometric degree of compression. The choice is grounded and an open combustion chamber in the form of an inverted axisymmetric “truncated cone” is developed. The proposed shape of the combustion chamber of a gas internal combustion engine for operation in the LPG reduces the geometric compression ratio of D-120 and D-144 diesel engines with an unseparated spherical combustion chamber, which reduces the geometric compression ratio from ε = 16,5 to ε = 9,4. The developed form of the combustion chamber allows the new diesel pistons or diesel pistons which are in operation to be in operation to be refined, instead of making special new gas pistons and to reduce the geometric compression ratio of diesel engines only by increasing the combustion chamber volume in the piston. This method of reducing the geometric degree of compression using conventional lathes is the most technologically advanced and cheap, as well as the least time consuming. Keywords: self-propelled chassis SSh-2540, wheeled tractors, diesel engines D-120 and D-144, gas engine with forced ignition, liquefied petroleum gas (LPG), compression ratio of the internal com-bustion engine, vehicles operating in the LPG.

Maintaining Low Exhaust Emissions With Turbocharged Gas Engines Using a Feedback Air–Fuel Ratio Control System

1987 ◽  
Vol 109 (4) ◽  
pp. 487-490 ◽  
Author(s):  
D. W. Eckard ◽  
J. V. Serve´
Keyword(s):  
Control System ◽  
Temperature Control ◽  
Exhaust Emissions ◽  
Ambient Conditions ◽  
Load Range ◽  
Heating Value ◽  
Gas Engine ◽  
Precise Control ◽  
Natural Gas Engine ◽  
Fuel Ratio

Maintaining low exhaust emissions on a turbocharged, natural gas engine through the speed and load range requires precise control of the air–fuel ratio. Changes in ambient conditions or fuel heating value will cause the air–fuel ratio to change substantially. By combining air–gas pressure with preturbine temperature control, the air–fuel ratio can be maintained regardless of changes in the ambient conditions or the fuel’s heating value. Design conditions and operating results are presented for an air–fuel controller for a turbocharged engine.

Experimental study of combustion strategy for jet ignition on a natural gas engine

2020 ◽  
pp. 146808742097775
Author(s):  
Ziqing Zhao ◽  
Zhi Wang ◽  
Yunliang Qi ◽  
Kaiyuan Cai ◽  
Fubai Li
Keyword(s):  
Experimental Study ◽  
Natural Gas ◽  
Efficient Points ◽  
Lean Burn ◽  
Gas Engine ◽  
Absolute Value ◽  
Natural Gas Engines ◽  
Natural Gas Engine ◽  
Excess Air ◽  
Lean Limit

To explore a suitable combustion strategy for natural gas engines using jet ignition, lean burn with air dilution, stoichiometric burn with EGR dilution and lean burn with EGR dilution were investigated in a single-cylinder natural gas engine, and the performances of two kinds of jet ignition technology, passive jet ignition (PJI) and active jet ignition (AJI), were compared. In the study of lean burn with air dilution strategy, the results showed that AJI could extend the lean limit of excess air ratio (λ) to 2.1, which was significantly higher than PJI’s 1.6. In addition, the highest indicated thermal efficiency (ITE) of AJI was shown 2% (in absolute value) more than that of PJI. Although a decrease of NOx emission was observed with increasing λ in the air dilution strategy, THC and CO emissions increased. Stoichiometric burn with EGR was proved to be less effective, which can only be applied in a limited operation range and had less flexibility. However, in contrast to the strategy of stoichiometric burn with EGR, the strategy of lean burn with EGR showed a much better applicability, and the highest ITE could achieve 45%, which was even higher than that of lean burn with air dilution. Compared with the most efficient points of lean burn with pure air dilution, the lean burn with EGR dilution could reduce 78% THC under IMEP = 1.2 MPa and 12% CO under IMEP = 0.4 MPa. From an overall view of the combustion and emission performances under both low and high loads, the optimum λ would be from 1.4 to 1.6 for the strategy of lean burn with EGR dilution.

Estimation of the Stoichiometric Air-Fuel Ratio in Liquefied Petroleum Gas-Injected Engines

2002 ◽  
Author(s):  
M. Chiang ◽  
C. Manzie ◽  
H. Watson ◽  
M. Palaniswami
Keyword(s):  
Liquefied Petroleum Gas ◽  
Fuel Ratio

Effects of Gas Composition on Combustion, Emission and Knocking Characteristics of Marine Lean Burn Gas Engine

2016 ◽  
Author(s):  
Yasuhisa Ichikawa ◽  
Hidenori Sekiguchi ◽  
Bondarenko Oleksiy ◽  
Dong-Hoon Yoo ◽  
Koichi Hirata
Keyword(s):  
Experimental Results ◽  
Emission Characteristics ◽  
Gas Composition ◽  
Liquefied Petroleum Gas ◽  
Lean Burn ◽  
Fuel Gas ◽  
Gas Engine ◽  
City Gas ◽  
Japanese City ◽  
Combustion Emission

The present study has experimentally investigated the effect of fuel gas composition on the combustion, emission and knocking characteristics of a marine lean burn gas engine. The experiments was carried out using the lean burn gas engine, which has the rated power output of 400 kW with spark ignition pre-chamber system. The various compositions of the base fuel gas (Japanese city gas) changed by supplying propane-based LPG (liquefied petroleum gas), butane-based LPG and hydrogen. This paper reports in detail the experimental results on the combustion and emission characteristics of the lean burn gas engine affected by the fuel gas composition. The experimental results showed that the composition of fuel gas mixed with P-LPG and B-LPG has a small effect on the combustion characteristics, and the operation of the engine is hardly affected. However, the addition of hydrogen causes the rise of the maximum combustion pressure and the attention should be paid on the ratio of hydrogen in the fuel gas. With regard to the emission characteristics, the NOx emission increased with increasing the ratio of P-LPG, B-LPG and hydrogen in the base fuel gas. The CO emission increased with increasing the ratio of P-LPG and B-LPG and decreased with increasing the ratio of hydrogen in the base fuel gas. It is expected that such the tendencies depended on the carbon quantity in the fuel gas. In addition, it was found that the knocking characteristics are associated with the methane number of fuel gas.

Catalyst light-off behavior of a spark-ignition LPG (liquefied petroleum gas) engine during cold start

Energy ◽  
2011 ◽  
Vol 36 (1) ◽  
pp. 53-59 ◽  
Author(s):  
Changming Gong ◽  
Kuo Huang ◽  
Baoqing Deng ◽  
Xunjun Liu
Keyword(s):  
Cold Start ◽  
Spark Ignition ◽  
Liquefied Petroleum Gas ◽  
Gas Engine
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