Evaluation of a distributed combustion concept using 1-D modeling for pressurized oxy-combustion system with low flue gas recirculation

Jafari, Hamed; Yang, Won Seok; Ryu, Changkook

doi:10.1016/j.fuel.2019.116723

Cited by 12 publications

(3 citation statements)

References 18 publications

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“…In this way, since simpler alloy materials can be used, the production cost can be reduced. [35] Before achieving distributed regime, combustion was performed at 21% O 2 concentration to simulate conventional combustion conditions. Then, in order to achieve distributed regime, N 2 or CO 2 was introduced into the fresh air-fuel mixture to reduce oxygen concentration in the oxidizer and to slow down the reaction rate.…”

Section: Temperaturementioning

confidence: 99%

Colourless distributed combustion effects on a pre‐mixed coke oven gas flame

Tasdemir,

Karyeyen

2023

Can J Chem Eng

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Fuels consisting of high hydrogen concentration can be consumed under colourless distributed combustion (CDC) to suppress flashback tendency in premixed conditions. Higher NOX challenges can also be overcome through CDC. For those purposes, coke oven gas was consumed under CDC within the scope of this study. To achieve CDC, or diluents were introduced into the oxidizer so that oxygen concentration in the oxidizer would be decreased from 21% O2 to its lean blow‐off limits. Excess air ratios were determined as λ = 1.2 and λ = 1.5 along with a thermal power of 10 kW under premixed conditions. A commercial computational fluid dynamics code was used to predict temperature distribution and , CO, and emissions. 162‐step reactions created with GRI‐Mech 3.0 chemical kinetics was integrated to the eddy dissipation concept combustion model. The temperature and profiles predicted were compared with the experimental results. Consistency was achieved at ~95% for temperature profiles, and almost 100% for profiles between the measured and the predicted ones. According to the results, it is concluded that a more homogeneous temperature distribution with the ~21% decrease in the maximum temperature was observed, and there was about 96% decrease in level. It was also demonstrated that using as a diluent is more effective in terms of temperature distribution over the combustor and reduction, while dilution with is more effective in terms about 70% in decrease on CO.

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Section: Temperaturementioning

confidence: 99%

Colourless distributed combustion effects on a pre‐mixed coke oven gas flame

Tasdemir,

Karyeyen

2023

Can J Chem Eng

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“…The application of biofuels in internal combustion engines (ICEs) is today a relevant issue as these types of engines are widely used for stationary power plants and in the transport sector. The main task for researchers today is to search for advanced combustion concepts [1][2][3] and alternative fuels to face the issues impacted by the traditional technologies [4,5].…”

Section: Introductionmentioning

confidence: 99%

Detailed Injection Strategy Analysis of a Heavy-Duty Diesel Engine Running on Rape Methyl Ester

et al. 2021

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Using biodiesel fuel in diesel engines for heavy-duty transport is important to meet the stringent emission regulations. Biodiesel is an oxygenated fuel and its physical and chemical properties are close to diesel fuel, yet there is still a need to analyze and tune the fuel injection parameters to optimize the combustion process and emissions. A four-injections strategy was used: two pilots, one main and one post injection. A highly advanced SOI decreases the NOx and the compression work but makes the combustion process less efficient. The pilot injection fuel mass influences the combustion only at injection close to the top dead center during the compression stroke. The post injection has no influence on the compression work, only on the emissions and the indicated work. An optimal injection strategy was found to be: pilot SOI 19.2 CAD BTDC, pilot injection fuel mass 25.4%; main SOI 3.7 CAD BTDC, main injection fuel mass 67.3% mg; post SOI 2 CAD ATDC, post injection fuel mass 7.3% (the injection fuel mass is given as a percentage of the total fuel mass injected). This allows the indicated work near the base case level to be maintained, the pressure rise rate to decrease by 20% and NOx emissions to decrease by 10%, but leads to a 5% increase in PM emissions.

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“…The furnace temperature controller determines the relationship between the oxygen-rich primary air and the low-oxygen cooled exhaust gas [88][89][90][91]. However, if the exhaust gas recirculation is not sufficient to limit the temperature in the combustion chamber, cooling with secondary air is also applied (override control).…”

Section: Introductionmentioning

confidence: 99%

Low Emissions Resulting from Combustion of Forest Biomass in a Small Scale Heating Device

et al. 2020

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The paper concerns the analysis of harmful emissions during the combustion process in households. The subject of the analysis is a low emission heating device with an output of 50 kW for burning biomass of forest origin (low-quality hardwoods or softwoods). The proposed boiler is automatically fed from the connected container by means of a screw conveyor. In this way, the optimum amount of fuel is supplied for maximum heat output (adjustment of the ratio of primary air to fuel). The proposed biomass heating system is equipped with a primary and secondary air supply system and exhaust gas sensors. This ensures optimal regulation of the air mixture and efficient and clean combustion. Proper control of the combustion process, control of the air supply by means of a lambda sensor and power control of the system ensure a low-emission combustion process. The system precisely adjusts to the heat demand. This results in highly efficient heating technology with low operating costs. In the presented work, the emission of exhaust gases from the proposed heating device during the combustion of woodchips and beech–oak pellets were measured. It is demonstrated that the proposed design of the boiler equipped with intelligent control significantly reduces emissions when the biomass solid fuels are used, e.g., CO emissions from beech and oak chips and pellets in the low-emission boiler—18 extract pipes shows the value <100 ppm, which is even lower than when gas is burned in the other boilers; on the other hand, the pine chips show even higher emission when burned in the low-emission burner. Consequently, the choice of biomass source and form of the fuel play some role in the emissions observed.

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Evaluation of a distributed combustion concept using 1-D modeling for pressurized oxy-combustion system with low flue gas recirculation

Cited by 12 publications

References 18 publications

Colourless distributed combustion effects on a pre‐mixed coke oven gas flame

Colourless distributed combustion effects on a pre‐mixed coke oven gas flame

Detailed Injection Strategy Analysis of a Heavy-Duty Diesel Engine Running on Rape Methyl Ester

Low Emissions Resulting from Combustion of Forest Biomass in a Small Scale Heating Device

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