Syngas as a Reburning Fuel for Natural Gas Combustion

2014 ◽  
Vol 35 (2) ◽  
pp. 181-190 ◽  
Author(s):  
Małgorzata Wilk ◽  
Aneta Magdziarz ◽  
Monika Zajemska ◽  
Monika Kuźnia
Keyword(s):  
Sewage Sludge ◽  
Natural Gas ◽  
Residence Time ◽  
Nox Reduction ◽  
Combustion Process ◽  
Combustion Products ◽  
Experimental Investigations ◽  
Gas Combustion ◽  
Numerical Tests ◽  
Natural Gas Combustion

Abstract The paper aims to confirm the syngas application as a reburning fuel to reduce e.g. NO emission during natural gas combustion. The main aim of this modelling work was to predict pollutants generated in the exhaust gases and to indicate the influence of the syngas on the natural gas combustion process. The effect of residence time of fuel-air mixture was also been performed. Calculations were made with CHEMIKN-PRO for reburning process using syngas. The boundary conditions of the reburning process were based on experimental investigations. The addition of 5, 10, 15 and 19% of reburning fuel into natural gas combustion was studied. The effects of 0.001 to 10 s of residence time and the addition of 5, 10, and 15% of syngas on combustion products were determined. The performed numerical tests confirmed that co-combustion of the natural gas with syngas (obtained from sewage sludge gasification) in the reburning process is an efficient method of NOx reduction by c.a. 50%. Syngas produced from sewage sludge can be utilised as a reburning fuel.

IGR Solid-State Electrochemical NOx Control for Natural Gas Combustion Exhaust Gases

1989 ◽  
Vol 111 (3) ◽  
pp. 394-397 ◽  
Author(s):  
M. S. Hossain ◽  
M. Neyman ◽  
W. J. Cook ◽  
A. Z. Gordon
Keyword(s):  
Solid State ◽  
Natural Gas ◽  
High Surface ◽  
Nox Reduction ◽  
High Surface Area ◽  
Combustion Products ◽  
Gas Combustion ◽  
Electrochemical Technology ◽  
Natural Gas Combustion ◽  
Nox Control

Solid-state electrochemical technology, embodied in the IGR process, is used to reduce nitrogen oxides (NOx) to nitrogen and oxygen, and thereby control NOx emissions from natural gas powered engines. The IGR deNOx process is based on solid-state, flow-through, high surface area, porous oxygen ion conductive ceramic electrolytes. Recent bench-scale experiments conducted for the Gas Research Institute have demonstrated NOx reduction in multicomponent gas streams, the inert portion of which simulate natural gas combustion products. The reduction products were analyzed by in situ gas chromatography to verify NOx reduction rates inferred from electrochemical measurements. IGR process advantages compared with existing NOx control technologies are reviewed.

Numerical Simulation of Natural Gas Combustion Process Using a One-Step and a Two-Step Reaction

2002 ◽  
Author(s):  
Angela O. Nieckele ◽  
Moˆnica F. Naccache ◽  
Marcos S. P. Gomes ◽  
Joa˜o N. E. Carneiro ◽  
Andre´ Augusto Isnard ◽  
...  
Keyword(s):  
Experimental Data ◽  
Natural Gas ◽  
Combustion Process ◽  
Chemical Species ◽  
Reaction Model ◽  
Gas Combustion ◽  
First Case ◽  
Natural Gas Combustion ◽  
Cylindrical Furnace ◽  
Global Reaction

The work evaluates the combustion of natural gas in a cylindrical furnace. The Generalized Finite Rate Reaction Model was selected for predicting the reactions. Two situations were considered. In the first case the combustion of the fuel was predicted by a single global reaction, and in the second case a two-step reaction was considered for predicting the combustion process. The conservation equations of mass, momentum, energy and chemical species were solved by the finite volume procedure, with the commercial software FLUENT. The turbulent flow was modeled by employing the two differential equation κ–ε model. The solutions obtained with the two reaction models, for the temperature and species concentration fields, were compared among them and against experimental data available in the literature. It was observed that the two-step reaction model represents better the physical phenomena, showing a better agreement with the experimental data.

scholarly journals Indicated Mean Effective Pressure Oscillations in a Natural Gas Combustion Engine

2009 ◽  
Vol 64 (5-6) ◽  
pp. 393-398 ◽  
Author(s):  
Grzegorz Litak ◽  
Michał Gęca ◽  
Bao-Feng Yao ◽  
Guo-Xiu Li
Keyword(s):  
Natural Gas ◽  
Combustion Engine ◽  
Combustion Process ◽  
Spark Ignition Engine ◽  
Effective Pressure ◽  
Gas Combustion ◽  
Indicated Mean Effective Pressure ◽  
Natural Gas Combustion ◽  
Measured Pressure ◽  
Lean Conditions

Fluctuations in a combustion process of natural gas in the internal spark ignition engine have been investigated. We measured pressure of the cyclic combustion and expressed its cyclic oscillations in terms of indicated mean effective pressure per cycle. By applying the statistical and multifractal analysis to the corresponding time series we show the considerable changes in engine dynamics for a different equivalence ratio decreases from 0.781 to very lean conditions.

Preliminary Computation on NOx Emission Reduction for Different Temperatures

2015 ◽  
Author(s):  
Jobaidur R. Khan
Keyword(s):  
Natural Gas ◽  
Nox Reduction ◽  
Industrial Area ◽  
Nox Emission ◽  
Gas Combustion ◽  
Exhaust Temperature ◽  
Different Temperatures ◽  
Wet Compression ◽  
Natural Gas Combustion ◽  
Lower Temperature

Wet compression is an enhancing tool for power augmentation in land based gas turbine system. One of the advantages of wet compression is NOx reduction. High exhaust temperature (in the range of 1300 and 1400 K) from combustion chamber is responsible for NOx generation. High amount of NOx causes acid rain in the industrial area, which is a big concern. As wet compression reduces NOx emission, it is very important to validate this fact. Comparison needs to be made between the combustion of natural gas (methane mainly) with the combustion of same with air in reduced temperature with the presence of water vapor. As a preliminary step of this, NOx emission needs to be modelled with proper prediction of it in a natural gas combustion environment. As a preliminary study, a simple rectangular geometry is considered here. Result shows that NOx emission is reduced with lower temperature, which needs to be validated further.

scholarly journals Analysis of combustion process in industrial gas engines powered with high methane and nitrified low-calorific gases

2013 ◽  
Vol 152 (1) ◽  
pp. 42-50
Author(s):  
Jakub ROJEWSKI ◽  
Rafał ŚLEFARSKI ◽  
Jacek WAWRZYNIAK
Keyword(s):  
Natural Gas ◽  
Combustion Process ◽  
Numerical Code ◽  
Numerical Computations ◽  
Gas Combustion ◽  
Elementary Reactions ◽  
Natural Gas Transmission ◽  
Gas Fuel ◽  
Natural Gas Combustion

The paper presents the results of an investigation of gas engines used in the Polish system of natural gas transmission. The investigation concerned both four-stroke and two-stroke engines. The engines were fed with two kinds of gas fuel – low-calorific natural gas containing 54.5 % of methane, and with high-methane (up to 95 %) natural gas. Combustion in both types of engines with different methods of mixture supply into the cylinder was analysed for different parameters. The paper also presents numerical computations of basic physical values characterizing combustion of gas fuels in engines. The computations were made with Cantera numerical code based on the mechanism of elementary reactions occurring while burning methane GRI 3.0 for various molar fractions of methane in the gas fuel.

Single Pellet Heating in Natural Gas Combustion Products in Mixture with Air and Oxygen

2020 ◽  
Vol 989 ◽  
pp. 480-485
Author(s):  
German V. Voronov ◽  
Il'ya V. Glukhov
Keyword(s):  
Heat Transfer ◽  
Natural Gas ◽  
Radiant Heat ◽  
Combustion Products ◽  
Physical Parameters ◽  
Radiant Heat Transfer ◽  
Gas Combustion ◽  
Single Pellet ◽  
Natural Gas Combustion ◽  
Pellet Heating

Single pellet heating was considered at natural gas combustion product movement with oxidant flow coefficient of α=1.0 with air and oxygen in unconstrained volume. Physical parameters (density, dynamic and kinematic viscosity) and heat transfer properties (temperature, heat capacity, thermal conductivity, thermal diffusivity) of combustion products correspond to the average composition of gas delivered to the Ural region. Iron-ore pellet average properties were evaluated, based on major pellet plant data. Convection and radiant heat transfer coefficients were determined at pellet heating in natural gas combustion products in a mixture with air and oxygen. It was noted that, at switching to gas burning with oxygen radiant heat transfer to the pellet surface increases significantly, as compared to the convection one.

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