Development of Gas Mixture System of Biogas and Natural Gas for Gas Engine Cogeneration

2005 ◽  
Author(s):  
Kunihiro Kokubu ◽  
Masakazu Hishinuma ◽  
Daisuke Isshiki
Keyword(s):  
Natural Gas ◽  
High Efficiency ◽  
Gas Mixture ◽  
Reliable Control ◽  
Cogeneration Plant ◽  
Safety Measures ◽  
Mixture Ratio ◽  
Gas Engine ◽  
Cogeneration System ◽  
Mixture System

Tokyo Gas has developed a compact and high-efficiency cogeneration system which can run with the mixture of biogas and natural gas, based on a new concept. To utilize the biogas whose amount of production varies from time to time, we have developed a gas mixture system that utilizes as much biogas as possible under simple and reliable control. Also, we have developed an air dilution system of natural gas to maintain stable combustion at the engine. Due to this system, the mixture ratio of biogas and natural gas can be anything from 0% to 100%. Further more, since this system is equipped with multiple safety measures, cogeneration system can continue its operation even after any thinkable malfunctions of the system. This gas mixture system and cogeneration plant has been installed at a beer brewery near Tokyo, and operating without any major troubles.

Assessment of Turbulent Combustion Models for Simulating Pre-Chamber Ignition in a Natural Gas Engine

2021 ◽  
Author(s):  
Joohan Kim ◽  
Riccardo Scarcelli ◽  
Sibendu Som ◽  
Ashish Shah ◽  
Munidhar Biruduganti ◽  
...  
Keyword(s):  
Natural Gas ◽  
Turbulent Combustion ◽  
High Efficiency ◽  
Turbulent Flame ◽  
Spark Ignition ◽  
Cylinder Wall ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Combustion Models ◽  
Combustion Processes

Abstract Lean combustion in an internal combustion engine is a promising strategy to increase thermal efficiency by leveraging a more favorable specific heat ratio of the fresh mixture and simultaneously suppressing the heat losses to the cylinder wall. However, unstable ignition events and slow flame propagation at fuel-lean condition lead to high cycle-to-cycle variability and hence limit the high-efficiency engine operating range. Pre-chamber ignition is considered an effective concept to extend the lean operating limit, by providing spatially distributed ignition with multiple turbulent flame-jets and enabling faster combustion rate compared to the conventional spark ignition approach. From a numerical modeling perspective, to date, still the science base and available simulation tools are inadequate for understanding and predicting the combustion processes in pre-chamber ignited engines. In this paper, conceptually different RANS combustion models widely adopted in the engine modeling community were used to simulate the ignition and combustion processes in a medium-duty natural gas engine with a pre-chamber spark-ignition system. A flamelet-based turbulent combustion model, i.e., G-equation, and a multi-zone well-stirred reactor model were employed for the multi-dimensional study. Simulation results were compared with experimental data in terms of in-cylinder pressure and heat release rate. Finally, the analysis of the performance of the two models is carried out to highlight the strengths and limitations of the two formulations respectively.

Assessment of Turbulent Combustion Models for Simulating Pre-Chamber Ignition in a Natural Gas Engine

2019 ◽  
Author(s):  
Joohan Kim ◽  
Riccardo Scarcelli ◽  
Sibendu Som ◽  
Ashish Shah ◽  
Munidhar S. Biruduganti ◽  
...  
Keyword(s):  
Natural Gas ◽  
Turbulent Combustion ◽  
High Efficiency ◽  
Turbulent Flame ◽  
Spark Ignition ◽  
Cylinder Wall ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Combustion Models ◽  
Combustion Processes

Abstract Lean combustion in an internal combustion engine is a promising strategy to increase thermal efficiency by leveraging a more favorable specific heat ratio of the fresh mixture and simultaneously suppressing the heat losses to the cylinder wall. However, unstable ignition events and slow flame propagation at fuel-lean condition lead to high cycle-to-cycle variability and hence limit the high-efficiency engine operating range. Pre-chamber ignition is considered an effective concept to extend the lean operating limit, by providing spatially distributed ignition with multiple turbulent flame-jets and enabling faster combustion rate compared to the conventional spark ignition approach. From a numerical modeling perspective, to date, still the science base and available simulation tools are inadequate for understanding and predicting the combustion processes in pre-chamber ignited engines. In this paper, conceptually different RANS combustion models widely adopted in the engine modeling community were used to simulate the ignition and combustion processes in a medium-duty natural gas engine with a pre-chamber spark-ignition system. A flamelet-based turbulent combustion model, i.e., G-equation, and a multi-zone well-stirred reactor model were employed for the multi-dimensional study. Simulation results were compared with experimental data in terms of in-cylinder pressure and heat release rate. Finally, the analysis of the performance of the two models is carried out to highlight the strengths and limitations of the two formulations respectively.

scholarly journals Adaptation of a gas cogeneration system used in power industry to drive inland waterway transport unit

2019 ◽  
Vol 178 (3) ◽  
pp. 235-239
Author(s):  
Zbigniew SROKA ◽  
Karolina BUCZMA
Keyword(s):  
Natural Gas ◽  
Nitrogen Oxides ◽  
Power Plants ◽  
Combined Heat And Power ◽  
Toxic Compounds ◽  
Gas Engine ◽  
Transport Unit ◽  
Inland Waterway ◽  
Cogeneration System ◽  
Overall Efficiency

Cogeneration systems are mainly used in industrial power plants (combined heat and power plants), but based on the analysis car-ried out in this publication, that suitably adapted and selected devices will be able on board of ships. A number of arguments have been obtained for using the indicated gas engine in a vessel. The cogeneration system guarantees high overall efficiency, as shown in the example of the cogeneration unit under study, for which the value of general efficiency was above 80%. In addition, the use of natural gas as a fuel could ensure a significant reduction in the amount of toxic compounds emitted to the atmosphere, especially nitrogen oxides (2-3 times) and smog (dust with PM10) around 25 times than standard limits. The use of natural gas as a fuel guarantees similar dynam-ic parameters as with the use of standard fuels.

Design and Analysis of the Waukesha APG1000 Engine

2006 ◽  
Author(s):  
Rodney Nicoson ◽  
Julian Knudsen
Keyword(s):  
Power Generation ◽  
Computer Simulation ◽  
Natural Gas ◽  
Rapid Prototyping ◽  
Thermal Efficiency ◽  
High Efficiency ◽  
Design Method ◽  
Department Of Energy ◽  
Gas Engine ◽  
Natural Gas Engine

Waukesha Engine, in cooperation with the Department of Energy, has designed a new high efficiency natural gas engine designed specifically for the power generation market. The APG1000 (Advance Power Generation) engine is capable of achieving 1 MW output at 42% thermal efficiency and less than 1 g/bhp-hr Nox. A design method using modern tools such as 3-D modeling, rapid prototyping and computer simulation have, in a large part, contributed to the success of this engine. This paper discusses the methodology and tools used in the design of the APG engine.

Effect of control strategy on performance and emissions of natural gas engine for cogeneration system

Energy ◽  
2015 ◽  
Vol 82 ◽  
pp. 353-360 ◽  
Author(s):  
Cheolwoong Park ◽  
Changgi Kim ◽  
Sungwon Lee ◽  
Gihun Lim ◽  
Sunyoup Lee ◽  
...  
Keyword(s):  
Natural Gas ◽  
Control Strategy ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Performance And Emissions ◽  
Cogeneration System
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