NIIGATA Ultra Lean Burn SI Gas Engines -Achieving High Efficiency and Low NOx Emission-

1990 ◽  
Author(s):  
Satoru Goto ◽  
Yasuhiro Itoh ◽  
Yutaka Higuchi ◽  
Tateo Nagai
Keyword(s):  
High Efficiency ◽  
Nox Emission ◽  
Lean Burn ◽  
Low Nox Emission

Using Numerical Simulation Tools to Assist the Development of a High Stability Low NOx Industrial Burner

2012 ◽  
Author(s):  
Ainan Bao ◽  
Dexin Wang ◽  
William Liss
Keyword(s):  
Flue Gas ◽  
High Efficiency ◽  
Cfd Simulation ◽  
Premixed Combustion ◽  
Nox Emission ◽  
Combustion Stability ◽  
Simulation Tool ◽  
Burner Design ◽  
Thermal Nox ◽  
Low Nox Emission

To achieve ultra low NOx emission as well as high efficiency for industrial burners, premixed or partial premixed combustion technology is becoming more attractive than flue gas recirculation approaches, which tend to cause low combustion stability and low energy use efficiency. A well designed premixed combustion system can achieve lower and more uniform combustion zone temperatures thus resulting in reduced thermal NOx generation. A multi-stage premixed industrial scale gas burner with oil backup capability has been developed by the authors, with the assistance from CFD simulation. By using staged combustion, combustion heat release is better distributed into a larger volume to avoid high peak flame temperature zone to occur. By using a primary stage combustion with a fuel rich flame and a hot high emissive metallic chamber wall, the burner combustion stability is ensured. The CFD tool was used to simulate and optimize the whole burner combustion and heat transfer process, with proper fluid dynamics and reaction models for this full size burner development. With the CFD efforts, the final burner design can achieve a very uniform temperature field, with peak flame temperatures below 1650°C, therefore thermal NOx generation is minimized. The numerical results show that this new gas-fired burner can achieve high efficiency with low NOx emission. Using the CFD simulation tool, the burner global parameters, such as its peak flame temperatures, its exhaust flue gas temperatures, and its NOx concentration distributions, have been studied under different burner operation conditions, e.g., different excess air levels, different burner firing rates, and different mixture inlet temperatures. The CFD simulation tool has been proved a good assistance for the burner design, as well as the burner performance optimization.

Environmental Protection and Fuel Consumption Reduction by Flameless Combustion Technology: A Review

2013 ◽  
Vol 388 ◽  
pp. 292-297 ◽  
Author(s):  
Seyed Ehsan Hosseini ◽  
Mazlan A. Wahid ◽  
Saber Salehirad
Keyword(s):  
Fuel Consumption ◽  
High Performance ◽  
High Efficiency ◽  
Combustion Process ◽  
The Other ◽  
Nox Emission ◽  
Flameless Combustion ◽  
Combustion Technology ◽  
Oil Crisis ◽  
Low Nox Emission

In recent years global fuel consumption has increased in the world due to modernization and progress in the standard of living. The conspicuous rate of carbon dioxide and nitrogen oxide released to the environment and fuel resources are depleted day by day due to inconsiderate fuel consumption. Requirement for efficient use of any kinds of fuel has become the other concern due to the oil crisis and limitation of fuel resources. In combustion process, the abatement of pollutants often associates with efficiency loss. In the other word, high efficiency and low pollutant which are the main requirements of combustion are not fulfilled by the existing combustion. Today, flameless combustion has received more attention because of its low NOx emission and significant energy saving. Generally, compatibility between high performance and low NOx emission has been observed by preheated air application and changing the combustion characteristics from traditional flame to flameless mode. This paper aims to review the concepts and the applications of flameless combustion and gathers useful information to understand the necessity of transient from traditional flame mode to flameless combustion.

Effects of Over Fire Air on the Combustion and NOx Emission Characteristics of a 600 MW Opposed Swirling Fired Boiler

2012 ◽  
Vol 512-515 ◽  
pp. 2135-2142 ◽  
Author(s):  
Yu Peng Wu ◽  
Zhi Yong Wen ◽  
Yue Liang Shen ◽  
Qing Yan Fang ◽  
Cheng Zhang ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Experimental Data ◽  
Empirical Method ◽  
Nox Emission ◽  
Emission Characteristics ◽  
Cfd Model ◽  
Nitrogen Release ◽  
Computational Fluid Dynamics Cfd ◽  
Low Nox Emission

A computational fluid dynamics (CFD) model of a 600 MW opposed swirling coal-fired utility boiler has been established. The chemical percolation devolatilization (CPD) model, instead of an empirical method, has been adapted to predict the nitrogen release during the devolatilization. The current CFD model has been validated by comparing the simulated results with the experimental data obtained from the boiler for case study. The validated CFD model is then applied to study the effects of ratio of over fire air (OFA) on the combustion and nitrogen oxides (NOx) emission characteristics. It is found that, with increasing the ratio of OFA, the carbon content in fly ash increases linearly, and the NOx emission reduces largely. The OFA ratio of 30% is optimal for both high burnout of pulverized coal and low NOx emission. The present study provides helpful information for understanding and optimizing the combustion of the studied boiler

Analysis of air-staged combustion of NH3/CH4 mixture with low NOx emission at gas turbine conditions in model combustors

Fuel ◽  
2019 ◽  
Vol 237 ◽  
pp. 50-59 ◽  
Author(s):  
Shan Li ◽  
Shanshan Zhang ◽  
Hua Zhou ◽  
Zhuyin Ren
Keyword(s):  
Gas Turbine ◽  
Nox Emission ◽  
Staged Combustion ◽  
Low Nox Emission

NOx emission control for automotive lean-burn engines by electro-catalytic honeycomb cells

2012 ◽  
Vol 203 ◽  
pp. 193-200 ◽  
Author(s):  
Ta-Jen Huang ◽  
Chung-Ying Wu ◽  
De-Yi Chiang ◽  
Chia-Chi Yu
Keyword(s):  
Emission Control ◽  
Nox Emission ◽  
Lean Burn

Ambient temperature NOx emission control for lean-burn engines by electro-catalytic tubes

2012 ◽  
Vol 445-446 ◽  
pp. 153-158 ◽  
Author(s):  
Ta-Jen Huang ◽  
Chung-Ying Wu ◽  
De-Yi Chiang ◽  
Chia-Chi Yu
Keyword(s):  
Ambient Temperature ◽  
Emission Control ◽  
Nox Emission ◽  
Lean Burn

Effects of stroke on spark-ignition combustion with gasoline and methanol

2021 ◽  
pp. 146808742110396
Author(s):  
Christian Wouters ◽  
Patrick Burkardt ◽  
Marcus Fischer ◽  
Michael Blomberg ◽  
Stefan Pischinger
Keyword(s):  
Alternative Fuels ◽  
Internal Combustion Engines ◽  
High Efficiency ◽  
Combustion Velocity ◽  
Spark Ignition ◽  
Efficiency Gain ◽  
Lean Burn ◽  
Piston Speed ◽  
Long Stroke ◽  
Stroke Engine

Besides electrification of the powertrain, new synthetic alternative fuels with the potential to be produced from renewable sources come into focus. Methanol is the most elementary liquid synthetic fuel and no novelty for use in internal combustion engines. This article presents pathways to achieve high efficiency spark-ignition methanol combustion on a direct injection spark-ignition single-cylinder research engine with two different stroke-to-bore ratios (1.2 and 1.5) and a constant bore. In addition, two compression ratios (CRs) were investigated on each setup: CR = 10.8 using RON95 E10 gasoline fuel and a higher CR = 15 using neat methanol. In contrast to previous studies of stroke-to-bore ratio influences on SI combustion, this article aims at demonstrating how the advantages of a high stroke-to-bore ratio can be exploited by combining a long-stroke engine with increased compression ratios and methanol. The increased stroke enhances the tumble motion due to a higher piston speed and a larger compression volume which improves the mixture homogenization and combustion velocity. Moreover, the lower surface/volume ratio results in a reduced heat transfer. When using RON95E10 gasoline fuel and CR = 10.8, an efficiency gain of up to 1.6% could be achieved with the long-stroke compared to the short-stroke especially at lower engine loads. With methanol and CR = 15, an efficiency gain of up to 1.6% could be achieved with the long-stroke setup compared to the short-stroke engine. Subsequently, lean burn conditions were experimentally investigated with methanol and CR = 15. The longer stroke allowed the lean burn limit to be extended from λ = 1.9 to λ = 2.0 with an efficiency gain of up to 2.2%. A maximum indicated efficiency of 47.4% could be achieved at λ = 1.9 with methanol on the long-stroke engine with CR = 15.

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