A multi-objective CFD optimization of liquid fuel spray injection in dry-low-emission gas-turbine combustors

Asgari, Behrad; Amani, E.

doi:10.1016/j.apenergy.2017.06.080

Cited by 35 publications

(10 citation statements)

References 51 publications

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“…Fuel flexibility, ambient temperature, fuel calorific/heating values, operating conditions, interaction of turbulent chemistry, and flow rates can considerably affect the combustion stability . Non-premixed flames have a wider stability range; however, NO x formation is significantly increased at greater splits of non-premixed fuel …”

Section: Existing Burner Technologies In Lpm Gas Turbinesmentioning

confidence: 99%

Review of Fuel/Oxidizer-Flexible Combustion in Gas Turbines

2020

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Strict emission control regulations call for continuous advancement in existing combustion and carbon-capture technologies to mitigate the rise in pollutants and greenhouse gases from fossil fuel combustion. Concurrently, improvements in combustion systems would also yield lower fuel consumption and operational cost with greater efficiency. This review addresses these concerns and presents the overview of different combustion technologies and burner designs for cleaner power generation in gas turbines. Emission characteristics are discussed and compared for different combustion concepts, including lean premixed air combustion and oxy-combustion. Various gas turbine burner technologies, including dry low NO x , enhanced-vortex, perforated-plate, and micromixer burners, are discussed extensively, in terms of their operating principle, fuel flexibility, and potential for superior performance under oxy-combustion conditions. Enhanced-vortex and micromixer burners show remarkable flame stability and fuel flexibility and are thus recommended for implementation with hydrogen enrichment in future oxy-fuel gas turbines. The fuel-flexibility approaches for clean energy production, such as hydrogen combustion, hydrogen-enriched combustion, syngas combustion, ammonia combustion, and fuel blending, are explored as well. With the vast recent advances in the techniques of hydrogen production and storage, hydrogen-fueled gas turbines seem to be the perfect choice for clean energy production. The adiabatic flame temperature is identified as a key controlling parameter for the design of oxidizer-flexible combustors in clean gas turbines.

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Section: Existing Burner Technologies In Lpm Gas Turbinesmentioning

confidence: 99%

Review of Fuel/Oxidizer-Flexible Combustion in Gas Turbines

2020

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“…Exhaust temperature was measured by using Chromel-Alumel thermocouple (K-type), their wires have 200 μm diameter and its normal measuring range is from 0 to 1370°C with digital thermometer (4). The thermal NO formation was measured by using the gas emission analyzer from the port of gas sample heated handle with length 0.9 ft and hose 11.5 ft and measure the NOx through a gas emission analyzer (5) [24,25].…”

Section: Experiments (Test) Descriptionmentioning

confidence: 99%

Experimental Study of Direct Water Injection Effect on NOx Reduction from The Gas Fuel

Kotob

Wahid

2020

ARFMTS

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Direct Water Injection (DWI) is commonly used in many nitrogen oxides (NOx) emissions control applications due to its effect to reduce the adiabatic flame temperature. In this paper an experimental test rig is designed to study the effect of water injection spray inside a simulated gas turbine combustor from the gas fuel. The practical work introduced by the chemical reaction methodology followed by the experiment which was presented and discussed carefully. Results are obtained in term of the exhaust gas temperature and different injection parameters including position, direction and fuel mass flow rate on the nitrogen oxide emission value in PPM (Parts per Million) at different conditions. The results showed that the best water injection effect was obtained at 45° degree inside the primary air zone. Injection location has a major effect on the NOx reduction as the best injected location is the Primary air zone compared with the direct fuel nozzle tip due to the increase of the water droplets residence time inside the combustor and perform a vortex that will affect the reduction of exhaust gas temperature and NOx emission respectively. The huge impact was observed at LPG (Liquefied Petroleum gas) flowrate 2.7L/min and water to fuel ratio about 0.4 as the NOx value was decreased about 73% from almost 381 PPM to 73 PPM. The chemical reaction arrangement order methodology presented good agreement with the experimental results at different fuel flow rate and equivalence ratio. The chemical Reaction equations were implemented to calculate the different adiabatic flame temperatures which is experimentally known as the exhaust gas temperature and impacted directly the NOx emission results.

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“…Table 4 shows the design variables and their corresponding range. A systematic approach 26,70,71 is chosen to study the effect of different design variables on the engine performance while proposing the optimal designs.…”

Section: Moosmentioning

confidence: 99%

Multi-objective optimizations of the boot injection strategy for reactivity controlled compression ignition engines

Yazdani

Amani

Naderan

2018

International Journal of Engine Research

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In this study, multi-objective optimizations of a reactivity controlled compression ignition engine are performed. The main focus is the investigation of effects of seven design variables, including swirl ratio, the first and second start of injections (SOI1 and SOI2), and four injection rate-shape parameters, on the objective parameters, namely, gross indicated efficiency, the second-law efficiency, ringing intensity, and emissions. The results show that in the low swirl ratio range (swirl ratio < 1), the emissions decrease by either increasing boot length or decreasing boot velocity. The physical analysis reveals that this is due to the penetration of the high-reactivity fuel vapor in whole squish area and a large portion of the crevice. This is because the more uniform mixture in the squish region slightly mitigates the formation of hot spots and NOx, and the propagation of reaction deeper into the crevice considerably reduces carbon monoxide and unburned hydrocarbons there. The sensitivity analysis manifests that swirl ratio has the strongest effect on all objectives, and besides swirl ratio, SOI2 has the greatest impact on gross indicated efficiency and emission, while SOI1 has the strongest influence on second-law efficiency and ringing intensity. The optimal case with an advance of SOI1 and a slight retard of SOI2, that is, a longer duration between the two injections, a lower swirl ratio (of 0.5) with respect to the base case, and appropriate injection rate-shape parameters (a high boot length and low boot velocity), achieves the gross indicated efficiency of 54% and merit function of 615.

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A multi-objective CFD optimization of liquid fuel spray injection in dry-low-emission gas-turbine combustors

Cited by 35 publications

References 51 publications

Review of Fuel/Oxidizer-Flexible Combustion in Gas Turbines

Review of Fuel/Oxidizer-Flexible Combustion in Gas Turbines

Experimental Study of Direct Water Injection Effect on NOx Reduction from The Gas Fuel

Multi-objective optimizations of the boot injection strategy for reactivity controlled compression ignition engines

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