NOx Emission Prediction Analysis and Comparison in Gas Turbine Combustor Utilizing CFD and CRN Combined Approach

2019 ◽  
Author(s):  
Naveed Ahmad ◽  
Liu Nairui ◽  
Momina Tariq ◽  
Raees Fida Swati ◽  
Muhammad Bilal Anwar
Keyword(s):  
Gas Turbine ◽  
Nox Emission ◽  
Combined Approach ◽  
Gas Turbine Combustor ◽  
Prediction Analysis

Effects of Burner Interaction on NOx Emission From Swirl Premix Burner in a Gas Turbine Combustor

2014 ◽  
Author(s):  
Cheon Hyeon Cho ◽  
Chae Hoon Sohn ◽  
Ju Hyeong Cho ◽  
Han Seok Kim
Keyword(s):  
Gas Turbine ◽  
Nox Emission ◽  
Gas Turbine Combustor ◽  
Step Size ◽  
Flow Temperature ◽  
Nox Formation ◽  
Air Stream ◽  
Flow Interactions ◽  
Model Chamber ◽  
Wall Interaction

Flame interaction between neighboring burners in a gas turbine combustor is investigated numerically for pursuit of its effect on NOx emission from the burners. In a model chamber or liner, EV burners with double cone are installed. Two burners with the same rotating direction of air stream are adopted and the distance between them is variable from 74.2 mm to 222.6 mm by the step size of 37.1 mm. Gaseous methane and air are adopted as fuel and oxidizer, respectively. From steady-state numerical analyses, flow, temperature, and NO concentration fields are calculated in all computational cases to find their correlation with NOx formation. NOx emission is evaluated at the exit of the model chamber with two burners as a function of burner distance and compared with that from a single burner. In all cases of two-burner calculations, NOx emission is higher than that of a single burner, which results from flow interactions between neighboring burners as well as between a burner and a liner wall. NOx emission is affected significantly by flow and flame interactions between them and strongly depends on burner distance. Burner interaction is divided into two regimes of a burner-burner interaction and a burner-wall interaction depending on the distance. In the former regime, NOx emission is reduced as flame interaction between burners is enhanced and in the latter regime, it is also reduced as interaction between the burner and the liner wall is enhanced.

A Neural Network Based Predictive Emission Monitoring Model for NOx Emission From a Gas Turbine Combustor

2002 ◽  
Author(s):  
G. Kibrya ◽  
K. K. Botros
Keyword(s):  
Neural Network ◽  
Ambient Temperature ◽  
Gas Turbine ◽  
Power Output ◽  
Field Tests ◽  
Absolute Error ◽  
Nox Emission ◽  
Cfd Model ◽  
Gas Turbine Combustor ◽  
Emission Monitoring

A Predictive Emission Monitoring (PEM) model for predicting NOx emission from a gas turbine combustor has been developed by employing an optimized Neural Network (NN) architecture. The Neural Network was trained by using actual field test data and predicted results of a Computational Fluid Dynamics (CFD) model of the combustor. The field tests were performed at a natural gas compressor station driven by a General Electric (GE) LM1600 conventional gas turbine. The model takes eight fundamental parameters (operating and ambient) as input, and predicts NO and NOx as outputs. The data used for training the model covers the entire operating ranges of power and ambient temperature for the site. The CFD model employs a non-equilibrium (flamelet) combustion scheme and a set of 8 reactions including the Zeldovich mechanism for thermal NOx, and an empirical correlation for prompt NOx formation. The results predicted by the CFD model were within 15% of the measured values. Results of the field tests demonstrated that the spool speed ratio of the gas turbine remained constant throughout the tests, the power output of the engine was linearly proportional to the spool speeds, and the NOx emission was proportional to the site power output. A Multi Layer Perceptron type Neural Network with two hidden layers, each with four neurons was found to be the optimum architecture for the model. The NO levels predicted by the PEM model based on the optimized NN had a maximum absolute error of approximately 7%, mean absolute error of 2.3% and standard deviation of 1.97%. One year operating data for the site was submitted to the trained NN model with ambient temperatures varying from −29.9 °C to 35.7 °C and output powers from 5.8 MW to 17 MW. It was found that the model produced consistent contours of NO emissions. As expected, the NO levels were found to increase with increasing power and/or ambient temperature.

A numerical approach to reduction of NOx emission from swirl premix burner in a gas turbine combustor

2013 ◽  
Vol 59 (1-2) ◽  
pp. 454-463 ◽  
Author(s):  
Cheon Hyeon Cho ◽  
Gwang Min Baek ◽  
Chae Hoon Sohn ◽  
Ju Hyeong Cho ◽  
Han Seok Kim
Keyword(s):  
Gas Turbine ◽  
Numerical Approach ◽  
Nox Emission ◽  
Gas Turbine Combustor ◽  
Reduction Of Nox

Large-Eddy Simulation in an Industrial Gasturbine Combustor for NOx Prediction

2012 ◽  
Author(s):  
Kohshi Hirano ◽  
Yoshiharu Nonaka ◽  
Yasuhiro Kinoshita ◽  
Nobuyuki Oshima ◽  
Kyohei Matsuya
Keyword(s):  
Large Eddy Simulation ◽  
Gas Turbine ◽  
Emission Reduction ◽  
Premixed Flame ◽  
Nox Emission ◽  
Pollutant Emission ◽  
Gas Turbine Combustor ◽  
Eddy Simulation ◽  
Large Eddy ◽  
The Difference

NOx emission reduction is important for developing gas-turbine engines. Predicting the thermal profile and pollutant-emission factor by numerical simulation is effective for reducing the development costs. Here a large eddy simulation coupled with a 2-scalar flamelet approach is applied to the numerical analysis of an industrial gas-turbine combustor. The combustor of an L20A-DLE gas-turbine engine is calculated. Combustor performance under different loads is investigated. NOx production decreases with reducing load, and this tendency agrees well with the experimental results. It is said that NOx production due to a large amount of supplemental burner fuel. NOx production in the simulation is lower than in the experiment. The simulated temperature in the combustor outlet is also lower than the adiabatic temperature. Moreover, the fuel is not burned completely within the combustor region. The difference in the combustion status in a supplemental burner is investigated. For the diffusion flame, a high-temperature region is observed locally owing to the presence of a fuel-rich region. For NOx production, NOx emission reduction is expected using a burner that introduces a premixed flame. From the simulation results, we can estimate NOx production in a gas-turbine combustor. The tendencies in the differences of the loads agreed well with the experimental data, and the superiority of a premixed flame was indicated.

scholarly journals Development of a Dry Ultra Low NOx Double Swirler Staged Gas Turbine Combustor

1996 ◽  
Author(s):  
Hiroshi Sato ◽  
Masaaki Mori
Keyword(s):  
Gas Turbine ◽  
Gas Flow ◽  
Combustion Efficiency ◽  
Nox Emission ◽  
Superior Performance ◽  
Operating Pressure ◽  
Gas Turbine Combustor ◽  
Fuel Gas ◽  
Combustion Tests ◽  
Low Nox Emission

This paper describes the development of an ultra-low NOx gas turbine combustor for cogeneration systems. The combustor, called a double swirler staged combustor, utilizes three-staged premixed combustion for low NOx emission. The unique feature of the combustor is its tertiary premix nozzles located downstream of the double swirler premixing nozzles around the combustor liner. Engine output is controlled by simply varying the fuel gas flow, and therefore employs no complex variable geometries for air flow control. Atmospheric combustion tests have demonstrated the superior performance of the combustor. NOx level is maintained at less than 3 ppm (O2=15%) over the range of engine output between 50% and 100%. Assuming the general relationship that NOx emission is proportional to the square root of operating pressure, the NOx level is estimated at less than 9 ppm (O2=15%) at the actual pressure of 0.91 MPa (abs.). Atmospheric tests have also shown high combustion efficiency; more than 99.9% over the range of engine output between 60% and 100%. Emissions of CO and UHC are maintained at 0 and 1 ppm (O2=15%), respectively, at the full engine load.

Development of a Dry Ultra-Low NOx Double Swirler Staged Gas Turbine Combustor

1998 ◽  
Vol 120 (1) ◽  
pp. 41-47 ◽  
Author(s):  
H. Sato ◽  
M. Mori ◽  
T. Nakamura
Keyword(s):  
Gas Turbine ◽  
Gas Flow ◽  
Combustion Efficiency ◽  
Nox Emission ◽  
Superior Performance ◽  
Operating Pressure ◽  
Gas Turbine Combustor ◽  
Fuel Gas ◽  
Combustion Tests ◽  
Low Nox Emission

This paper describes the development of an ultra-low NOx gas turbine combustor for cogeneration systems. The combustor, called a double swirler staged combustor, utilizes three-staged premixed combustion for low NOx emission. The unique feature of the combustor is its tertiary premix nozzles located downstream of the double swirler premixing nozzles around the combustor liner. Engine output is controlled by simply varying the fuel gas flow, and therefore employs no complex variable geometries for airflow control. Atmospheric combustion tests have demonstrated the superior performance of the combustor. NOx level is maintained at less than 3 ppm (O2 = 15 percent) over the range of engine output between 50 and 100 percent. Assuming the general relationship that NOx emission is proportional to the square root of operating pressure, the NOx level is estimated at less than 9 ppm (O2 = 15 percent) at the actual pressure of 0.91 MPa (abs.). Atmospheric tests have also shown high combustion efficiency; more than 99.9 percent over the range of engine output between 60 and 100 percent. Emissions of CO and UHC are maintained at 0 and 1 ppm (O2 = 15 percent), respectively, at the full engine load.

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