Dimensionally reduced modeling of nitric oxide formation for premixed methane-air flames with ammonia content

Jójka, Joanna; Ślefarski, Rafał

doi:10.1016/j.fuel.2017.12.070

Cited by 30 publications

(16 citation statements)

References 17 publications

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“…Compared to hydrocarbon fuels, NH3 has narrower flammability limit, higher ignition temperature, lower flame temperature and lower burning velocity. Combustion of NH3/Air mixtures also delivers smaller amounts of energy released from oxidation reactions and causes a reduction of radiation heat transfer from the flame (lack of carbon dioxide (CO2) in combustion products) [8]. Another negative aspect of NH3 use as fuel is nitric oxide emissions.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on combustion of CH4/NH3 fuel blends in an industrial furnace operated in flameless conditions

2020

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This paper presents the results of an experimental study on the combustion process of methane mixed with ammonia (NH3) in flameless mode. At a time of striving for CO2-free power, ammonia became a potential energy storage carrier fuel from renewable sources. Flameless combustion features low emissions and is a very efficient technology used in the power sector, as well as steel production, ceramics, etc. Industrial furnaces were tested in the context of pure methane combustion with an addition of ammonia, up to 5%. Flameless combustion conditions were achieved with a regenerative gas burner system (High Regenerative System- HRS). The burner consists of four ceramic regenerators allowing for continuous preheating of air, even up to 50K lower than the temperature of the combustion chamber wall. Constant power of the introduced fuel was kept at 150kW and the fuel-air equivalence ratio ranged from 0.75 to 0.95. The results have shown a growth of molar fraction of nitric oxides in flue gases when ammonia content in the fuel rose. The increase is more significant for the tests with a higher amount of oxygen in the combustion chamber (a lower fuel-air equivalence ratio). An addition of 5% of NH3 into the fuel caused an emission of nitric oxide at the levels of 113 ppmv and 462 ppmv (calculated to O2 = 0%), respectively for low and high fuel-air equivalence ratios. The calculated conversion factor (CF) of NH3 to fuel nitric oxide has shown extremely low values, equal to 2% (? = 0.95) and 8.4% (? = 0.75), which indeed confirmed that ammonia can be burned with low emissions in flameless combustion technology.

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Section: Introductionmentioning

confidence: 99%

Experimental study on combustion of CH4/NH3 fuel blends in an industrial furnace operated in flameless conditions

2020

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“…From the burner designs offered on the market, we distinguish old and new type burners with an improved air supply system. The latest research issues are guided many times towards the use of fuels different from conventional fuels [1,2,3]. Natural gas and gases generated in the refining of crude oil are no longer the only ones that are used in the industry and the municipal and household sector.…”

Section: Introductionmentioning

confidence: 99%

The influence of geometry of primary air channels in standard retort burners on dust emission

Ciupek

Bartoszewicz

2019

MATEC Web Conf.

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The article presents the analysis of dust emissions from a low power boiler fired with various solid fuels. The boiler, presented for testing, met the emission conditions for boilers made in the third class in accordance with the PN-EN 303-5: 2012 standard. The solid fuel boiler was equipped with two different retort burners with automatic fuel supply. For the test were used a first generation retort burner with a fixed rim and the next were used second generation retort burner provided with a rotary rim. Both constructions differ in the geometrical model of the primary air supply system to the furnace. During the tests, the work of the burners was controlled using a microprocessor temperature controller. During the research, the rotation time of the screw supplying the fuel through the retort to the furnace was changed, as well as the rotational speed of the blast fan impeller responsible for supplying the combustion air. The purpose of the tests was to check whether the boiler will meet the highest environmental class regardless of the technical parameters of the burner and fuel used. The article describes the research methodology and analysis of the results obtained. The effect of the tests carried out is a comparison of average dust emission values depending on the fuel used and the work settings of a given burner. The test results are a prerequisite for further research work in terms of the impact of primary air supply on the emission of harmful substances.

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“…This specific type of a flow is present in different applications. Influence of a cross flow on the main stream is present for a delivering air into combustion process inside retort burners during solid fuels combustion [2] and for gas burners, where similarly a secondary air is delivered [3,4].…”

Section: Introductionmentioning

confidence: 99%

Analysis of a cross-flow influence for a turbulence progress in an initial segment of axisymmetric duct

Judt

Bartoszewicz

2019

MATEC Web Conf.

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Influence for a nondisturbed stream by cross-flow is present in many technical applications. In part of applications, this phenomenon is caused intentionally, but in others, it is a side-effect. Flow through the closed duct is one of the most frequently realized types of flow in thermal devices. The paper shows an influence of cross-flow for a laminar stream, which is flowing through closed, round duct. The considered case was calculated in numerical calculations and analyzed during experimental research. Cross-flow stream was generated by four circular nozzles located on the duct walls in some distance from the duct inlet, which was distributed along the circumference of analyzed construction in the right angle to the mainstream. Experimental research was realized by a constant temperature anemometry measurement method. A numerical model of a fluid flow was created in ANSYS Fluent software. Unsteady numerical calculations of a cross-flow influence for a mainstream was realized with the Detached Delayed Eddy Dissipation model of turbulence application. Realized research established how a cross stream can turbulent a laminar flow in a closed, circular duct. Authors showed velocity distribution in the main duct after cross-flow influence and demonstrated, that this method allows ascending turbulence of a flow in external parts of fluid flow.

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Dimensionally reduced modeling of nitric oxide formation for premixed methane-air flames with ammonia content

Cited by 30 publications

References 17 publications

Experimental study on combustion of CH4/NH3 fuel blends in an industrial furnace operated in flameless conditions

Experimental study on combustion of CH4/NH3 fuel blends in an industrial furnace operated in flameless conditions

The influence of geometry of primary air channels in standard retort burners on dust emission

Analysis of a cross-flow influence for a turbulence progress in an initial segment of axisymmetric duct

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