Advanced Gas Engine Cogeneration Technology for Special Applications

1995 ◽  
Vol 117 (4) ◽  
pp. 826-831 ◽  
Author(s):  
D. C. Plohberger ◽  
T. Fessl ◽  
F. Gruber ◽  
G. R. Herdin
Keyword(s):  
Natural Gas ◽  
Ambient Air ◽  
Pollutant Emissions ◽  
Thermal Reactor ◽  
Maximum Efficiency ◽  
Exhaust Aftertreatment ◽  
Natural Gas Engines ◽  
Low Emission ◽  
Wide Range ◽  
The U.S

In recent years gas Otto-cycle engines have become common for various applications in the field of power and heat generation. Gas engines in gen-sets and cogeneration plants can be found in industrial sites, oil and gas field application, hospitals, public communities, etc., mainly in the U.S., Japan, and Europe, and with an increasing potential in the upcoming areas in the far east. Gas engines are chosen sometimes even to replace diesel engines, because of their clean exhaust emission characteristics and the ample availability of natural gas in the world. The Austrian Jenbacher Energie Systeme AG has been producing gas engines in the range of 300 to 1600 kW since 1960. The product program covers state-of-the-art natural gas engines as well as advanced applications for a wide range of alternative gas fuels with emission levels comparable to Low Emission (LEV) and Ultra Low Emission Vehicle (ULEV) standards. In recent times the demand for special cogeneration applications is rising. For example, a turnkey cogeneration power plant for a total 14.4 MW electric power and heat output consisting of four JMS616-GSNLC/B spark-fired gas engines specially tuned for high altitude operation has been delivered to the well-known European ski resort of Sestriere. Sestriere is situated in the Italian Alps at an altitude of more than 2000 m (approx. 6700 ft) above sea level. The engines feature a turbocharging system tuned to an ambient air pressure of only 80 kPa to provide an output and efficiency of each 1.6 MW and up to 40 percent @ 1500 rpm, respectively. The ever-increasing demand for lower pollutant emissions in the U.S. and some European countries initiates developments in new exhaust aftertreatment technologies. Thermal reactor and Selective Catalytic Reduction (SCR) systems are used to reduce tailpipe CO and NOx emissions of engines. Both SCR and thermal reactor technology will shift the engine tuning to achieve maximum efficiency and power output. Development results are presented, featuring the ultra low emission potential of biogas and natural gas engines with exhaust aftertreatment.

Deployment of Fuel Cell Electric Buses in Transit Agencies: Hydrogen Fueling Infrastructure Scenarios

2015 ◽  
Author(s):  
Analy Castillo ◽  
Scott Samuelsen ◽  
Brendan Shaffer
Keyword(s):  
Fuel Cell ◽  
Natural Gas ◽  
Distribution System ◽  
Environmental Benefits ◽  
Pollutant Emissions ◽  
Systematic Evaluation ◽  
Generation Process ◽  
Wide Range ◽  
Hydrogen Infrastructure ◽  
Transit Agencies

For transit agencies looking to implement Zero Emission Vehicles (ZEV), Fuel Cell Electric Buses (FCEBs) represent an opportunity because of the similar range and refueling times compared to conventional buses, but with improved fuel economy. To assure an environmentally sensitive hydrogen infrastructure that can respond to the wide range of needs and limitations of transit agencies, a systematic evaluation of options is essential. This paper illustrates the systematic evaluation of different hydrogen infrastructure scenarios for a transit agency. The Orange County Transportation Authority (OCTA) in California was selected for the study. Three different hydrogen infrastructure configurations are evaluated and compared to the existing paradigm of compressed natural gas buses and diesel buses. One additional scenario is analyzed in order to compare feasibility and environmental benefits of FCEBs with Plug-in Electric Buses. Each scenario represents (1) a specific mix and percentage of contribution from the various hydrogen generation technologies (e.g., on-site electrolysis, central SMR, and on-site SMR), (2) defined paths to obtain the corresponding feedstock for each generation process (e.g., biogas, natural gas, renewable energies), (3) detailed hydrogen distribution system (e.g., mix of gaseous/liquid truck delivery), and (4) the spatial allocation of the generation location and fueling locations (e.g., on-site / off-site refueling station) while also accounting for constraints specific to the OCTA bases. This systematic evaluation provides Well-to-Wheel (WTW) impacts of energy and water consumption, greenhouse gases and criteria pollutant emissions of the processes and infrastructure required to deploy FCEBs and Plug-in Electric Buses at OCTA. In addition, this evaluation includes a detailed analysis of the space requirements and operations modifications that may be necessary, but yet feasible, for the placement of such infrastructure.

scholarly journals Lean-Burn Natural Gas Engines: Challenges and Concepts for an Efficient Exhaust Gas Aftertreatment System

2020 ◽  
Author(s):  
Patrick Lott ◽  
Olaf Deutschmann
Keyword(s):  
Natural Gas ◽  
Carbon Dioxide Emissions ◽  
Rational Design ◽  
Catalytic Converter ◽  
Pollutant Emissions ◽  
Exhaust Gas ◽  
Lean Burn ◽  
Aftertreatment System ◽  
Natural Gas Engines ◽  
Exhaust Gas Aftertreatment

AbstractHigh engine efficiency, comparably low pollutant emissions, and advantageous carbon dioxide emissions make lean-burn natural gas engines an attractive alternative compared to conventional diesel or gasoline engines. However, incomplete combustion in natural gas engines results in emission of small amounts of methane, which has a strong global warming potential and consequently makes an efficient exhaust gas aftertreatment system imperative. Palladium-based catalysts are considered as most effective in low temperature methane conversion, but they suffer from inhibition by the combustion product water and from poisoning by sulfur species that are typically present in the gas stream. Rational design of the catalytic converter combined with recent advances in catalyst operation and process control, particularly short rich periods for catalyst regeneration, allow optimism that these hurdles can be overcome. The availability of a durable and highly efficient exhaust gas aftertreatment system can promote the widespread use of lean-burn natural gas engines, which could be a key step towards reducing mankind’s carbon footprint.

Simulation and performance comparison between diesel and natural gas engines for marine applications

2017 ◽  
Vol 231 (2) ◽  
pp. 690-704 ◽  
Author(s):  
Marco Altosole ◽  
Giovanni Benvenuto ◽  
Ugo Campora ◽  
Michele Laviola ◽  
Raphael Zaccone
Keyword(s):  
Natural Gas ◽  
Diesel Oil ◽  
Performance Comparison ◽  
Pollutant Emissions ◽  
Natural Gas Engines ◽  
Marine Engines ◽  
Prime Movers ◽  
And Performance ◽  
Marine Applications ◽  
Continuous Power

The article shows the performance comparison between two marine engines, fuelled by natural gas and diesel oil, respectively, both belonging to the ‘Bergen’ engine series of Rolls-Royce Marine, suitable as prime movers for ship propulsion. Two different simulation codes, one for each engine, validated by means of geometrical and performance data provided by the manufacturer, have been developed to extend the comparison to the whole working area of the examined engines. Although the maximum continuous power is very similar (about 2 MW at the same rotational speed), some differences exist in size, efficiency and pollutant emissions of the two types of engines. The reasons are investigated through a specific thermodynamic analysis, aimed to explain such differences, in terms of efficiency and emissions (particularly carbon dioxide), when varying the working conditions. The analysis is carried out by comparing the respective real cycles, at the same working condition, and repeating the comparison for different engine delivered powers and rotational speeds. In addition, a study of the different modes of combustion is developed to explain the major differences found in the emissions of nitrogen oxides.

Comparative Analysis of EGR and Air Dilution in Spark-Ignited Natural Gas Engines

2017 ◽  
Author(s):  
William Glewen ◽  
Chris Hoops ◽  
Joel Hiltner ◽  
Michael Flory
Keyword(s):  
Natural Gas ◽  
Power Density ◽  
Thermal Efficiency ◽  
Gas Temperature ◽  
Natural Gas Engines ◽  
Cycle Simulation ◽  
Wide Range ◽  
Charge Mixture ◽  
The Impact ◽  
Three Way Catalyst

Industrial natural gas engines are used in a wide range of applications, each with unique requirements in terms of power density, initial cost, thermal efficiency, and other factors. As a result of these requirements, distinct engine designs have evolved to serve various applications. Heavy-duty spark-ignited engines can generally be divided into two broad categories based on their charge characteristics and method of emissions control. Stoichiometric engines are widely used in applications where first cost, absolute emissions and relative engine simplicity are more important than fuel consumption. In most of the developed world, stoichiometric engines are equipped with a three-way catalyst to control emissions of nitrogen oxides (NOx) as well as products of incomplete combustion and raw unburned fuel. Dilution of the charge mixture with excess air reduces the peak combustion gas temperature and associated heat rejection. As a result, lean burn engines are generally able to achieve higher efficiency and power density without inducing excessive component temperatures or end gas knock. NOx formation is mitigated by the reduced gas temperatures, such that most regulatory standards can currently be met in-cylinder. Significant obstacles exist to meeting more stringent future emissions regulations in this manner, however. Another possible strategy is to dilute the charge mixture with recirculated exhaust gas. This offers similar benefits as air dilution while maintaining the ability to use a three-way catalyst for emissions after-treatment. While similar principles apply in either case, the choice of diluent can have a significant impact on knock resistance, emissions formation, thermal efficiency, and other parameters of importance to engine developers and operators. This work aimed to examine the unique characteristics of EGR and air dilution from a thermodynamic and combustion perspective. A combination of cycle simulation tools and experimental data from a single-cylinder test engine was applied to demonstrate the impact of diluent properties on a fundamental level, and to illustrate departures from idealized behavior and practical considerations specific to the development of combustion systems for spark-ignited natural gas engines.

Formaldehyde Formation in Large Bore Engines Part 2: Factors Affecting Measured CH2O

1999 ◽  
Vol 122 (4) ◽  
pp. 611-616 ◽  
Author(s):  
Daniel B. Olsen ◽  
Charles E. Mitchell
Keyword(s):  
Natural Gas ◽  
Air Pollutant ◽  
Operating Conditions ◽  
Factors Affecting ◽  
Natural Gas Engines ◽  
Spark Timing ◽  
Wide Range ◽  
Hazardous Air Pollutant ◽  
Relationship Of ◽  
The Impact

Current research shows that the only hazardous air pollutant of significance emitted from large bore natural gas engines is formaldehyde CH2O. A literature review on formaldehyde formation is presented focusing on the interpretation of published test data and its applicability to large bore natural gas engines. The relationship of formaldehyde emissions to that of other pollutants is described. Formaldehyde is seen to have a strong correlation to total hydrocarbon (THC) level in the exhaust. It is observed that the ratio of formaldehyde to THC concentration is roughly 1.0–2.5 percent for a very wide range of large bore engines and operating conditions. The impact of engine operating parameters, load, rpm, spark timing, and equivalence ratio, on formaldehyde emissions is also evaluated. [S0742-4795(00)01004-8]

Effects of Spark Plug Number and Location in Natural Gas Engines

1992 ◽  
Vol 114 (3) ◽  
pp. 475-479 ◽  
Author(s):  
R. C. Meyer ◽  
D. P. Meyers ◽  
S. R. King ◽  
W. E. Liss
Keyword(s):  
Natural Gas ◽  
Thermal Efficiency ◽  
Cylinder Pressure ◽  
Natural Gas Engines ◽  
Single Cylinder Engine ◽  
Spark Plug ◽  
Combustion Duration ◽  
Peak Cylinder Pressure ◽  
Wide Range ◽  
Pressure Peak

Combustion experiments were conducted on a spark-ignited single-cylinder engine operating on natural gas. A special open chamber cylinder head was designed to accept as many as four spark plugs. Data were obtained to investigate the effects of spark plug quantity and location on NOx, HC, CO emissions, brake and indicated thermal efficiency, MBT timing, combustion duration, ignition delay, peak cylinder pressure, peak cylinder temperature, and heat release over a wide range of equivalence ratios.

Researches on NOx Emissions from the Test Bench Testing of a Post Combustion Burner

2016 ◽  
Vol 841 ◽  
pp. 303-308
Author(s):  
Mihaela Cretu ◽  
Ene Barbu ◽  
Victoria Teleaba ◽  
Valeriu Vilag ◽  
Radu Mirea
Keyword(s):  
Air Quality ◽  
Natural Gas ◽  
Gas Turbine ◽  
Test Bench ◽  
Ambient Air ◽  
Measured Data ◽  
Pollutant Emissions ◽  
Restrictive Environment ◽  
Bench Testing ◽  
Efficient Work

The more and more restrictive environment requirements in the field of pollutant emissions of co-generative plants are imposing researches related to the more efficient work of those related to the post combustion facility. The paper presents the results of a post combustion burner achieved on a test bench, when it idling operates on natural gas mixed with air or with burned gases of a gas turbine. The modeling of the measured emissions, led to NOx concentrations in ambient air that are below the limits imposed by the in force regulations related to air quality and are correlated to the real time measured data.

Development of the Tracer Gas Method for Large Bore Natural Gas Engines—Part II: Measurement of Scavenging Parameters

2002 ◽  
Vol 124 (3) ◽  
pp. 686-694 ◽  
Author(s):  
D. B. Olsen ◽  
G. C. Hutcherson ◽  
B. D. Willson ◽  
C. E. Mitchell
Keyword(s):  
Natural Gas ◽  
Operating Conditions ◽  
Trapping Efficiency ◽  
Pollutant Emissions ◽  
Boost Pressure ◽  
Tracer Gas ◽  
Gas Industry ◽  
Natural Gas Engines ◽  
Natural Gas Industry ◽  
Scavenging Efficiency

In this work the tracer gas method using nitrous oxide as the tracer gas is implemented on a stationary two-stroke cycle, four-cylinder, fuel-injected large-bore natural gas engine. The engine is manufactured by Cooper-Bessemer, model number GMV-4TF. It is representative of the large bore natural gas stationary engine fleet currently in use by the natural gas industry for natural gas compression and power generation. Trapping efficiency measurements are carried out with the tracer gas method at various engine operating conditions, and used to evaluate the scavenging efficiency and trapped A/F ratio. Scavenging efficiency directly affects engine power and trapped A/F ratio has a dramatic impact on pollutant emissions. Engine operating conditions are altered through variations in boost pressure, speed, back pressure, and intake port restriction.

scholarly journals Factors of Global Competitiveness of American LNG

2019 ◽  
Vol 12 (6) ◽  
pp. 43-70
Author(s):  
S. V. Zhukov ◽  
A. О. Maslennikov ◽  
M. V. Sinitsyn
Keyword(s):  
Natural Gas ◽  
Time Lag ◽  
The United States ◽  
Production Costs ◽  
Global Competitiveness ◽  
Long Run ◽  
Wide Range ◽  
The World ◽  
Gas Market ◽  
The U.S

The United States started lique fied natural gas (LNG) export in 2016 and just in two years became the world’s fourth largest exporter of LNG. There is a high probability that in the near future the U.S. will emerge as the third largest LNG exporter after Australia and Qatar. The article focuses on the factors, which ensure global competitiveness of U.S. LNG until 2030. The authors show that: first, the first wave of American export LNG projects significantly speeded up restructuring of contract system in the world gas trade as well as suppor ted development of a more flexible mechanism of natural gas pricing; secondly, production costs of the associated natural gas in the U.S. are relatively low and it is highly probable to expect Henry hub gas price to stabilize at around 2.5 dollars per MMBTU in the long run, what gives the American gas producers potential capability to significantly improve their global competitiveness by means of production and transportation costs reduction; fourthly, new waves of U.S. LNG export will not necessa rily be linked to the Henry Hub index, but to a wide range of price indicators, inclu ding the Brent oil price. With increasing flows of globally competitive Ameri can LNG entering the market, transformation of the institutional structure, contracts system and price mecha nism that have been unfold in the world LNG trade for the last ten to fifteen years became irreversible. That creates prerequisites for rapid formation of the world LNG market as well as with a some time lag of a global gas market.

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