Towards lower gas turbine emissions: Flameless distributed combustion

Khidr, Kareem I.; Eldrainy, Yehia A.; El-Kassaby, M.M.

doi:10.1016/j.rser.2016.09.032

Cited by 69 publications

(26 citation statements)

References 89 publications

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“…Flameless combustion has been applied to low heating value (LHV) gas fuel, it is mostly based on dilution of fuel (methane mixed with inert gases) . Utilization of flameless combustion with a real LHV gas fuel remains much less common, as reported by Khidr et al Producer gas (PG) from biomass gasification is one of the alternative gas fuels for the heating process and power generation. It has LHV of about 4 to 5 MJ/m 3 and is not readily used in a conventional combustor.…”

Section: Introductionmentioning

confidence: 99%

Simulation of producer gas flameless combustion with fresh reactant diluted by hot flue gas

et al. 2018

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Summary Flameless combustion is considered as a flexible and efficient combustion process for low heating value gas fuel. This paper presents numerical simulations of premixed flameless combustion using producer gas as a fuel. Different initial conditions of the premixed fresh reactant (air/fuel mixture) and dilution levels are taken into account for the investigation. The numerical simulations were investigated using a network of chemical reactor models with the detailed reaction mechanism of GRI‐Mech 3.0. A threshold dilution level for flameless combustion fuelled by producer gas was determined. The numerical results show that dilution of the fresh reactant with hot combustion products and initial fresh reactant temperature play important roles in flameless combustion formation and its auto‐ignition behaviour, rather than equivalence ratio of the fresh reactant. In the flameless combustion regime, temperature and chemical concentrations were reduced while chemical kinetics process was decelerated, resulting in delay of the auto‐ignition process.

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Section: Introductionmentioning

confidence: 99%

Simulation of producer gas flameless combustion with fresh reactant diluted by hot flue gas

et al. 2018

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“…Rather, homogeneous temperature distribution is achieved as well as noise and thermal stress are reduced. Khidr et al [18] and Xing et al [19] review this approach.…”

Section: Introductionmentioning

confidence: 99%

Simulation and Exergy Analysis of Energy Conversion Processes Using a Free and Open-Source Framework—Python-Based Object-Oriented Programming for Gas- and Steam Turbine Cycles

et al. 2018

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State-of-the-art thermodynamic simulation of energy conversion processes requires proprietary software. This article is an attempt to refute this statement. Based on object-oriented programming a simulation and exergy analysis of a combined cycle gas turbine is carried out in a free and open-source framework. Relevant basics of a thermodynamic analysis with exergy-based methods and necessary fluid property models are explained. Thermodynamic models describe the component groups of a combined heat and power system. The procedure to transform a physical model into a Python-based simulation program is shown. The article contains a solving algorithm for a precise gas turbine model with sophisticated equations of state. As an example, a system analysis of a combined cycle gas turbine with district heating is presented. Herein, the gas turbine model is validated based on literature data. The exergy analysis identifies the thermodynamic inefficiencies. The results are graphically presented in a Grassmann chart. With a sensitivity analysis a thermodynamic optimization of the district heating system is discussed. Using the exergy destruction rate in heating condensers or the overall efficiency as the objective function yields to different results.

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“…2 It uses heat recuperation concept for preheating the oxidizer to enhance the efficiency of the combustion system. [4][5][6] However, several investigations 7-10 on producer gas (PG) flameless combustion have been found, in spite of its significance as an alternative gas fuel for the power and heat generations. Flameless combustion has been extensively applied to gaseous and liquid fuels.…”

Section: Introductionmentioning

confidence: 99%

“…Flameless combustion has been extensively applied to gaseous and liquid fuels. [4][5][6] However, several investigations 7-10 on producer gas (PG) flameless combustion have been found, in spite of its significance as an alternative gas fuel for the power and heat generations. 11 The raw PG generated by gasification process is a hot-dirty gas (high tar and particulate contamination), where extra cleaning and cooling stages are required before the gas is being used in some downstream processes.…”

Section: Introductionmentioning

confidence: 99%

Swirl flow field analysis of producer gas premixed charge in a flameless cyclone combustor

2018

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Summary The flow dynamics of producer gas premixed charge in a cyclone combustor was investigated using the computational fluid dynamic modeling. Two main variables to achieve high swirl flow and reactant dilution were the flow rate of the reactants and nozzle diameter. The first variable showed a considerable effect on the in‐combustor residence time reducing from 0.64 to 0.44 seconds when the reactant flow rate increases from 0.037 to 0.057 kg/second. While its effect on the swirl flow distribution and flameless conditions was not significant, as indicated by the steady swirl number and reactant dilution degree averaging 2.5% and 58%, respectively. On the other hand, decreasing the nozzle diameter from 50 to 20 mm was more beneficial for the enhancement of reactant dilution and swirl flow distribution as they increased from 58% to 78% and 2.5 to 3.4, respectively. The result also showed that reducing the nozzle diameter below 40 mm is suitable for the present configuration of the combustor to be effectively operated in flameless combustion mode. However, the smallest diameter (20 mm) resulted in more fluctuations of the axial velocity profile, which may lead to highly turbulent fluid dynamic features.

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Towards lower gas turbine emissions: Flameless distributed combustion

Cited by 69 publications

References 89 publications

Simulation of producer gas flameless combustion with fresh reactant diluted by hot flue gas

Simulation of producer gas flameless combustion with fresh reactant diluted by hot flue gas

Simulation and Exergy Analysis of Energy Conversion Processes Using a Free and Open-Source Framework—Python-Based Object-Oriented Programming for Gas- and Steam Turbine Cycles

Swirl flow field analysis of producer gas premixed charge in a flameless cyclone combustor

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