Numerical simulation of ultra-low calorific value gas combustion

2011 ◽  
Author(s):  
Wuqi Wen ◽  
Shiping Jin ◽  
Suyi Huang ◽  
Shunli Fang ◽  
Xilai Zhang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Calorific Value ◽  
Gas Combustion

Parametric Study of Emissions From Low Calorific Value Syn-Gas Combustion, With Variation of Fuel Distribution, in a Prototype Three Sector Burner

2011 ◽  
Author(s):  
Ivan R. Sigfrid ◽  
Ronald Whiddon ◽  
Marcus Alde´n ◽  
Jens Klingmann
Keyword(s):  
Equivalence Ratio ◽  
Flame Temperature ◽  
Calorific Value ◽  
Discrete Control ◽  
Test Sequence ◽  
Gas Combustion ◽  
Fuel Distribution ◽  
Gasification Process ◽  
Dilute Gas ◽  
Main Burner

The emission composition is measured for a prototype burner while varying the equivalence ratio in discrete portions of the burner. The burner is a three sector system, consisting of a separate igniter, pilot/stabilizer and main burner. The design allows for discrete control of equivalence ratio in each of the three sectors. The ignition sector, designated RPL (Rich-Pilot-Lean), operates from rich to lean equivalence values, and serves to ignite the pilot sector, which, in turn, stabilizes the main combustion sector. All three burner sections are premixed. The burner is operated at atmospheric pressure with inlet flows heated to 650 K (±8 K). Tests were performed for three gases: methane, a model syngas (10% CH4, 22.5% CO, 67.5% H2), and dilute syngas. The dilute gas includes sufficient nitrogen to lower the heating value to 15 MJ/m3. The model syngas and diluted syngas are representative of fuels produced by gasification process. The burner emissions, specifically, CO, CO2, O2 and NOx, are measured while holding the RPL equivalence value constant and varying the equivalence ratio of the pilot and main sectors. The equivalence ratios for pilot and main sectors are chosen such that the total burner equivalence ratios remain constant during a test sequence. The target total equivalence ratio for each gas is chosen such that all experiments should have the same flame temperature.

scholarly journals Low and Medium Calorific Value Gasification Gas Combustion in IC Engines

10.5772/64459 ◽  
2016 ◽  
Author(s):  
Ftwi Yohaness Hagos ◽  
Abd Rashid Abd Aziz ◽  
Shaharin A. Sulaiman ◽  
Bahaaddein K.M. Mahgoub
Keyword(s):  
Calorific Value ◽  
Gas Combustion ◽  
Ic Engines

B105 NUMERICAL SIMULATION OF A COMBUSTOR FOR BURNING PYROLYSIS GAS(Combustion-2)

2009 ◽  
Vol 2009.1 (0) ◽  
pp. _1-99_-_1-104_
Author(s):  
Chunliang ZHOU ◽  
Jinying LI ◽  
Hongtao ZHENG ◽  
Baoling ZHANG
Keyword(s):  
Numerical Simulation ◽  
Pyrolysis Gas ◽  
Gas Combustion

Low Fuel-NOx Combustion of Synthetic LCV Gas

2006 ◽  
Author(s):  
Belkacem Adouane ◽  
Guus Witteveen ◽  
Wiebren de Jong ◽  
Jos P. van Buijtenen
Keyword(s):  
Gas Turbines ◽  
Research Work ◽  
Combustion Process ◽  
Calorific Value ◽  
Green Energy ◽  
Nox Emissions ◽  
Gas Combustion ◽  
Reduction Of Nox ◽  
Thermal Nox ◽  
Fuel Nox

Fuel NOx is one of the main issues related to the combustion of biomass derived Low Calorific Value (LCV) Gas. The high NOx emissions accompanying the combustion of that fuel in gas turbines or gas engines are compromising the CO2 neutral character of biomass and are a barrier towards the introduction of this green energy source in the market. The reduction of NOx emissions has been one of the main preoccupations of researchers in the LCV gas combustion field. Although, much has been achieved for thermal NOx which is caused mainly by the conversion of the nitrogen of the air in high temperature regions, less work has been devoted to the reduction of fuel NOx, which has as a main source the fuel bound nitrogen FBN, namely ammonia in case of biomass. Reducing the conversion of the FBN to NOx has been the main issue in recent research work. However, fuel NOx could be reduced significantly applying methods; like washing the gas in a scrubber prior its entrance to the combustor, and SNCR or SCR methods applied at the exhaust. But those solutions stay very expensive in terms of polluted waste water and catalyst cost. In this paper, the approach is to reduce the conversion of FBN to NOx inside a newly designed combustor. The idea is to optimize the combustion process ending up with the lowest possible conversion of FBN to NOx. The LCV gas used in the experiments described in this paper is made by mixing CO, CO2, H2, natural gas and N2 with proportions comparable to those of the real LCV gas. This gas is then doped with NH3 to simulate the FBN. In this paper the conversion ratio of FBN to NOx versus the FBN concentration is presented. Furthermore, the system is investigated in terms of the effect of CH4 concentration on the conversion of FBN to NOx. And measurements along the combustor axis were performed with a traversing probe where temperature and important emissions along the axis were measured. In all the experiments described in the paper, The LCV gas has an HHV (High Calorific Value) ranging from 4 to 7Mj/nm3. The newly designed combustor contains an embedded inner cylinder. In these experiments presented are without that embedded cylinder. The purpose of the current experiments is to be compared to the later experiments with the insert in order to define clearly the effect of the inner cylinder. Furthermore, this arrangement, i.e. without the insert, gave us the opportunity to traverse the combustor by a probe and to measure temperature and species profiles, which is of a great importance in defining the key parameter controlling the conversion of NH3 to NOx.

Experimental Investigation on a Newly Designed Combustor for LCV Gas

2003 ◽  
Author(s):  
Belkacem Adouane ◽  
Marco C. van der Wel ◽  
Wiebren de Jong ◽  
Jos. P. van Buijtenen
Keyword(s):  
Gas Turbines ◽  
Alternative Energy ◽  
Thermal Power ◽  
Calorific Value ◽  
Gas Combustion ◽  
Fuel Gas ◽  
Gas Cleaning ◽  
Alternative Energy Sources ◽  
Hot Gas Cleaning ◽  
The Eu

Air blown gasification of biomass is one of the most promising and efficient ways to use alternative energy sources like organic matters from waste and biomass for producing LCV (Low Calorific Value) gas. This fuel is best used in highly efficient gas turbines (or combined cycles). The section Thermal Power Engineering of Delft University of Technology operates a 1.5 MW pressurized fluidized bed gasification rig, including a hot gas cleaning unit with the ability to test pressurized combustors designed and optimized for LCV gas combustion. In this paper, the results of six combustion experiments with the 1 MW non-swirling TUD (Technical University Delft) combustor are presented and compared with the results of experiments performed with a 1.0 MW swirling combustor designed by ALSTOM Power UK. The primary and cooling airflow of the TUD combustor can be altered independently for optimization purposes. The experiments were performed at 3.5 and 5.0 bara and stable combustion was accomplished with gas of heating values (HHV) ranging from 2.7 to 3.8 MJ/m3n. Combustion efficiencies of the TUD combustor were well above 99.9% and emissions of CO were within the EU standards, except for one experiment where Minphyl as catalyst was added to the gasifier fuel. A high percentage of primary air was used in this experiment. Emissions of NO were outside the EU standards (100 ppm) for four of the six experiments because of the high fuel bound nitrogen (FBN) concentrations in the fuel gas. The FBN conversion rate ranged from 98% to 39% for FBN concentrations ranging from 238 to 2238 ppm.

scholarly journals Numerical Simulation of the Effect of CH4/CO Concentration on Combustion Characteristics of Low Calorific Value Syngas

ACS Omega ◽  
2021 ◽  
Vol 6 (8) ◽  
pp. 5754-5763
Author(s):  
Jianing Chen ◽  
Guoyan Chen ◽  
Anchao Zhang ◽  
Haoxin Deng ◽  
Xiaoping Wen ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Calorific Value ◽  
Combustion Characteristics ◽  
Co Concentration
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