Compression ignition of directly injected natural gas with entrained diesel

2010 ◽  
Vol 11 (3) ◽  
pp. 207-218 ◽  
Author(s):  
C A Laforet ◽  
B S Brown ◽  
S N Rogak ◽  
S R Munshi
Keyword(s):  
Natural Gas ◽  
Compression Ignition

Experimental Investigation of a Heavy-Duty Compression-Ignition Engine Retrofitted to Natural Gas Spark-Ignition Operation

2019 ◽  
Vol 141 (11) ◽  
Author(s):  
Jinlong Liu ◽  
Hemanth Kumar Bommisetty ◽  
Cosmin Emil Dumitrescu
Keyword(s):  
Natural Gas ◽  
Spark Ignition ◽  
Operating Conditions ◽  
Compression Ignition ◽  
Heavy Duty ◽  
Compression Ignition Engine ◽  
Engine Operation ◽  
Cycle Variation ◽  
Spark Timing ◽  
Ci Engines

Heavy-duty compression-ignition (CI) engines converted to natural gas (NG) operation can reduce the dependence on petroleum-based fuels and curtail greenhouse gas emissions. Such an engine was converted to premixed NG spark-ignition (SI) operation through the addition of a gas injector in the intake manifold and of a spark plug in place of the diesel injector. Engine performance and combustion characteristics were investigated at several lean-burn operating conditions that changed fuel composition, spark timing, equivalence ratio, and engine speed. While the engine operation was stable, the reentrant bowl-in-piston (a characteristic of a CI engine) influenced the combustion event such as producing a significant late combustion, particularly for advanced spark timing. This was due to an important fraction of the fuel burning late in the squish region, which affected the end of combustion, the combustion duration, and the cycle-to-cycle variation. However, the lower cycle-to-cycle variation, stable combustion event, and the lack of knocking suggest a successful conversion of conventional diesel engines to NG SI operation using the approach described here.

scholarly journals Research on the Compression Ignition and Combustion of Natural Gas and Its Reformed Gas

2005 ◽  
Vol 71 (705) ◽  
pp. 1465-1474 ◽  
Author(s):  
Susumu SATO ◽  
Yudai YAMASAKI ◽  
Hideo KAWAMURA ◽  
Norimasa IIDA
Keyword(s):  
Natural Gas ◽  
Compression Ignition ◽  
Ignition And Combustion

scholarly journals Numerical and Experimental Investigation of Combustion and Knock in a Dual Fuel Gas/Diesel Compression Ignition Engine

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
A. Gharehghani ◽  
S. M. Mirsalim ◽  
S. A. Jazayeri
Keyword(s):  
Natural Gas ◽  
Diesel Oil ◽  
Combustion Characteristic ◽  
Simultaneous Increase ◽  
Dual Fuel ◽  
Compression Ignition ◽  
Swirl Ratio ◽  
Characteristic Analysis ◽  
Mode Of Operation ◽  
Intake Pressure

Conventional compression ignition engines can easily be converted to a dual fuel mode of operation using natural gas as main fuel and diesel oil injection as pilot to initiate the combustion. At the same time, it is possible to increase the output power by increasing the diesel oil percentage. A detailed performance and combustion characteristic analysis of a heavy duty diesel engine has been studied in dual fuel mode of operation where natural gas is used as the main fuel and diesel oil as pilot. The influence of intake pressure and temperature on knock occurrence and the effects of initial swirl ratio on heat release rate, temperature-pressure and emission levels have been investigated in this study. It is shown that an increase in the initial swirl ratio lengthens the delay period for auto-ignition and extends the combustion period while it reduces NOx. There is an optimum value of the initial swirl ratio for a certain mixture intake temperature and pressure conditions that can achieve high thermal efficiency and low NOxemissions while decreases the tendency to knock. Simultaneous increase of intake pressure and initial swirl ratio could be the solution to power loss and knock in dual fuel engine.

Decreasing hydrocarbon and carbon monoxide emissions of a natural-gas engine operating in the quasi-homogeneous charge compression ignition mode at low loads

2005 ◽  
Vol 219 (9) ◽  
pp. 1125-1131 ◽  
Author(s):  
Su Ling ◽  
Zhou Longbao ◽  
Liu Shenghua ◽  
Zhong Hui
Keyword(s):  
Carbon Monoxide ◽  
Natural Gas ◽  
Thermal Efficiency ◽  
Homogeneous Charge Compression Ignition ◽  
Compression Ignition ◽  
Brake Thermal Efficiency ◽  
Pilot Fuel ◽  
Cng Engine ◽  
Standard Mode ◽  
Homogeneous Charge

Experimental studies have been carried out on decreasing the hydrocarbon (HC) and carbon monoxide (CO) emissions of a compressed natural-gas (CNG) engine operating in quasi-homogeneous charge compression ignition (QHCCI) mode at low loads. The effects of three technical approaches including partial gas cut-off (PGC), intake air throttling, and increasing the pilot fuel quantity on emissions and the brake thermal efficiency of the CNG engine are studied. The results show that HC and CO emissions can be reduced with only a small penalty on the brake thermal efficiency. An increase in the brake thermal efficiency and reductions in HC and CO emissions can be simultaneously realized by increasing the pilot fuel quantity. It is also indicated from experiments that the HC and CO emissions of the engine can be effectively reduced when using intake air throttling and increasing the pilot fuel quantity are both adopted. However, nitrogen oxide (NOx) emissions increase with increase in the throttling and the pilot fuel quantity. Under PGC conditions, NOx emissions are lower than those in the standard mode; however, they increase and exceed the values in the standard mode in increases in the load and natural-gas supply.

Operating Characteristics of Natural Gas Fueled Homogeneous Charge Compression Ignition Engine

1999 ◽  
Author(s):  
Y. Kawabata ◽  
K. Nakagawa ◽  
F. Shoji
Keyword(s):  
Natural Gas ◽  
Homogeneous Charge Compression Ignition ◽  
Nox Emission ◽  
Compression Ignition ◽  
Operating Characteristics ◽  
Compression Ignition Engine ◽  
Gas Engine ◽  
Engine Combustion ◽  
Gas Fueled ◽  
Homogeneous Charge

Abstract Recently, a new design of engine combustion that achieves higher efficiency and less NOx emission has been proposed. Some researchers have started studying the concept, which is called Homogeneous Charge Compression Ignition (HCCI), but there have been few reports on investigations using a future prospective alternative fuel, natural gas. In this study, natural gas fueled operation of HCCI using a single cylinder gas engine was conducted. Operating and exhaust characteristics were obtained. Experimental data confirmed the potential of higher efficiency and less NOx emission, though THC and CO were higher. Based on these data, the feasibility of this concept for gas engines is also examined.

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