Standard Practice for Determining the Calculated Methane Number (MNC) of Gaseous Fuels Used in Internal Combustion Engines

10.1520/d8221 ◽  
2019 ◽  
Author(s):  
Keyword(s):  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Standard Practice ◽  
Gaseous Fuels ◽  
Methane Number

Behavior Prediction Model in Gas Fueled Spark Ignition Internal Combustion Engines Turbocharged for Genset Application

2013 ◽  
Author(s):  
Jorge Duarte Forero ◽  
German Amador Diaz ◽  
Fabio Blanco Castillo ◽  
Lesme Corredor Martinez ◽  
Ricardo Vasquez Padilla
Keyword(s):  
Equivalence Ratio ◽  
Internal Combustion Engines ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Spark Ignition ◽  
Operating Conditions ◽  
Inlet Temperature ◽  
Combustion Engines ◽  
Gaseous Fuels ◽  
Methane Number

In this paper, a mathematical model is performed in order to analyze the effect of the methane number (MN) on knock tendency when spark ignition internal combustion engine operate with gaseous fuels produced from different thermochemical processes. The model was validated with experimental data reported in literature and the results were satisfactory. A general correlation for estimating the autoignition time of gaseous fuels in function of cylinder temperature, and pressure, equivalence ratio and methane number of the fuel was carried out. Livengood and Wu correlation is used to predict autoignition in function of the crank angle. This criterium is a way to predict the autoignition tendency of a fuel/air mixture under engine conditions and consider the ignition delay. A chemical equilibrium model which considers 98 chemical species was used in this research in order to simulate the combustion of the gaseous fuels at differents engine operating conditions. The effect of spark advance, equivalence ratio, methane number (MN), charge (inlet pressure) and inlet temperature (manifold temperature) on engine knocking is evaluated. This work, explore the feasibility of using syngas with low methane number as fuel for commercial internal combustion engines.

Characteristics of Auto-Ignition in Internal Combustion Engines Operated With Gaseous Fuels of Variable Methane Number

2017 ◽  
Vol 139 (4) ◽  
Author(s):  
German Amador ◽  
Jorge Duarte Forero ◽  
Adriana Rincon ◽  
Armando Fontalvo ◽  
Antonio Bula ◽  
...  
Keyword(s):  
Compression Ratio ◽  
Internal Combustion Engines ◽  
Coal Gasification ◽  
Error Function ◽  
Internal Combustion ◽  
Operating Conditions ◽  
Combustion Engines ◽  
Gaseous Fuels ◽  
Auto Ignition ◽  
Methane Number

This paper explores the feasibility of using Syngas with low methane number as fuel for commercial turbocharged internal combustion engines. The effect of methane number (MN), compression ratio (CR), and intake pressure on auto-ignition tendency in spark ignition internal combustion engines was determined. A nondimensional model of the engine was performed by using kinetics mechanisms of 98 chemical species in order to simulate the combustion of the gaseous fuels produced from different thermochemical processes. An error function, which combines the Livengood–Wu with ignition delay time correlation, to estimate the knock occurrence crank angle (KOCA) was proposed. The results showed that the KOCA decreases significantly as the MN increases. Results also showed that Syngas obtained from coal gasification is not a suitable fuel for engines because auto-ignition takes place near the beginning of the combustion phase, but it could be used in internal combustion engines with reactivity controlled compression ignition (RCCI) technology. For the case of high compression ratio and a high inlet pressure at the engine's manifold, fuels with high MN are suitable for the operating conditions proposed.

Application of Mechanisms for the Control of Autoignition in High Power Internal Combustion Engine Fueled With Natural Gas

2013 ◽  
Author(s):  
Jorge Duarte Forero ◽  
German Amador Diaz ◽  
Jesus Garcia Garcia ◽  
Marco San Juan Mejia ◽  
Lesme Corredor Martinez
Keyword(s):  
Natural Gas ◽  
Internal Combustion Engine ◽  
Control Strategy ◽  
Internal Combustion Engines ◽  
Feedforward Control ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Control Loop ◽  
Gaseous Fuels ◽  
Methane Number

In this paper, a thermodynamic model of a spark ignition internal combustion engine fueled with natural gas is developed in order to estimate the air-fuel-unburned gas temperature at before top dead center (BTDC). This temperature is used as controlled variable in a control loop in order to avoid the autoignition phenomena when the engine operates with a fuel with different methane number from the methane number requirement of the engine. The model formulation is based on a polytropic compression proccess whose coefficient was determined experimentally in a turbocharged internal combustion engine fueled with natural gas. To make feasible the use of differents gaseous fuels from natural gas, it was necessary to design two control strategies to avoid the knocking phenomenon and choose the best one. The ambient temperature is the disturbance considered, whose changes are significant in different places in the world. The first control strategy that was implemented is called “Robust”, which employs a conventional feedback control loop with a robust controller which is designed. The response of this control loop is compared to the response of the second control strategy called “Feedforward control”. The results obtained reveals that Feedforward control strategy has better performance than robust control strategy for this application. The control strategy and the model proposed will allow increase the range of application of gaseous fuels with low methane number (MN) leading to guarantee a safe running in internal combustion engines that currently are fueled with natural gas.

Auto-ignition control in turbocharged internal combustion engines operating with gaseous fuels

Energy ◽  
2014 ◽  
Vol 71 ◽  
pp. 137-147 ◽  
Author(s):  
Jorge Duarte ◽  
Germán Amador ◽  
Jesus Garcia ◽  
Armando Fontalvo ◽  
Ricardo Vasquez Padilla ◽  
...  
Keyword(s):  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Gaseous Fuels ◽  
Auto Ignition

scholarly journals DEVELOPMENT OF TECHNOLOGIES FOR NATURAL GAS AND BIOGAS UTILIZATION IN TRANSPORT / APSKATS PAR TRANSPORTA SEKTORĀ IZMANTOJAMĀM DABASGĀZES UN BIOGĀZES TEHNOLOĢIJĀM

2013 ◽  
Vol 50 (6) ◽  
pp. 26-35
Author(s):  
Y. Gelfgat ◽  
R. Smigins
Keyword(s):  
Air Quality ◽  
Natural Gas ◽  
Internal Combustion Engines ◽  
Fossil Fuels ◽  
Internal Combustion ◽  
Transportation Costs ◽  
Combustion Engines ◽  
Gaseous Fuels ◽  
Gas Utilization

Abstract Popularity of methane-containing gaseous fuels has slowly been growing since their appearance, especially in the last decades. Occasional non-availability of liquid fossil fuels, the necessity to reduce the transportation costs and to improve the air quality are the basic factors which stimulated development of gas utilization technologies - from accumulation, compression and deflation of gas to its usage in internal combustion engines. Since then different solutions have been offered, and the authors are reviewing them - from the first use of natural gas to nowadays.

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