Robust Design of the Coaxial Jet Cluster Nozzle Burner for DME (Dimethyl Ether) Fuel

Kobayashi, Nariyoshi; Inoue, Hiroshi; Koizumi, Hirorni; Watanabe, Tomoko

doi:10.1115/gt2003-38410

Cited by 9 publications

(6 citation statements)

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“…The finned tubes are located in the convective heat transfer zone downstream of the combustor. The rate of fuel consumption is 43.2m 3 N /h of DME. The steam pressure is regulated up to 700kPa.…”

Section: Industrial Scale Testmentioning

confidence: 99%

“…This boiler is a natural circulation type, and the upper steam drum and the lower water drum are connected by water tubes and downcomers. The fuel consumption rate can be changed from 92 to 425 m 3 N /h. The maximum steam pressure is 1.0MPa.…”

Section: Industrial Scale Testmentioning

confidence: 99%

“…This fact causes a difficulty in the use of pre-mixed system for low-NOx combustion. In order to develop combustion technology of DME for boilers and gas turbines, it is essential to introduce new and alternative concept for low-NOx combustion (3) .…”

Section: Introductionmentioning

confidence: 99%

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Low NOx Combustion of DME by Means of Flue Gas Recirculation

Matsumoto

Ozawa

Terada

et al. 2008

JPES

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This study focuses on the fundamental characteristics of DME (Dimethyl Ether) combustion aiming at development of low-NOx combustion technology with flue gas recirculation, FGR. The flue gas is recirculated into the combustion chamber to reduce the oxygen concentration and to suppress the combustion gas temperature, so that NOx emission is significantly reduced. The fuel gas recirculation at high mixing ratio, however, may lead to unstable combustion of conventional fuels, methane or city gas. On the other hand, DME has very high potential of applicability for the flue gas recirculation even at high mixing ratio because of its high burning velocity and low ignition temperature. Combustion tests were conducted with laboratory-scale 11kW combustor. The maximum FGR ratio is 85% at the initial air ratio of 1.5 with preheated diluted air about 600K. The NOx emission reduced to 13ppm at 0%-O 2 , which corresponds to about 9% of NOx emission at FGR=0%. The stable combustion is sustained even in the low oxygen concentration by preheating diluted-air up to near the auto-ignition temperature of DME. Finally, the effect of the flue gas recirculation on the NOx and CO emission is discussed with reference to the industrial-scale water-tube boilers.

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Section: Industrial Scale Testmentioning

confidence: 99%

Section: Industrial Scale Testmentioning

confidence: 99%

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Low NOx Combustion of DME by Means of Flue Gas Recirculation

Matsumoto

Ozawa

Terada

et al. 2008

JPES

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“…DME has seen experimental use as an additive to the main fuel in diesel engines [2,3], with additions in the range of 10-30% DME by mass [4], or as a single fuel in diesel engines [5,6]. DME has also shown promise as a fuel in gas turbines [7][8][9] and as an addition to n-Butane in HCCI engines [10][11][12]. DME can either be produced from natural gas, coal or biomass [13] or via a dehydration reaction of methanol [14].…”

Section: Introductionmentioning

confidence: 99%

Reduced Chemical Kinetic Reaction Mechanism for Dimethyl Ether-Air Combustion

Zettervall

Fureby

Nilsson

2021

Fuels

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Development and validation of a new reduced dimethyl ether-air (DME) reaction mechanism is presented. The mechanism was developed using a modular approach that has previously been applied to several alkane and alkene fuels, and the present work pioneers the use of the modular methodology, with its underlying H/C1/O base mechanism, on an oxygenated fuel. The development methodology uses a well-characterized H/C1/O base mechanism coupled to a reduced set of fuel and intermediate product submechanisms. The mechanism for DME presented in this work includes 30 species and 69 irreversible reactions. When used in combustion simulation the mechanism accurately reproduced key combustion characteristics and the small size enables use in computationally demanding Large Eddy Simulations (LES) and Direct Numerical Simulations (DNS). It has been developed to accurately predict, among other parameters, laminar burning velocity and ignition delay times, including the negative temperature regime. The evaluation of the mechanism and comparison to experimental data and several detailed and reduced mechanisms covers a wide range of conditions with respect to temperature, pressure and fuel-to-air ratio. There is good agreement with experimental data and the detailed reference mechanisms at all investigated conditions. The mechanism uses fewer reactions than any previously presented DME-air mechanism, without losing in predictability.

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“…This fact causes difficulty in the use of pre-mixed system for low-NOx combustion. In order to develop combustion technology of DME for boilers and gas turbines, it is essential to introduce new and alternative concept for low-NOx combustion (2) .…”

Section: Introductionmentioning

confidence: 99%

Development of Low-NOx DME Multi-Port Burner

Matsumoto

Ozawa

Ishihara

et al. 2006

JSME international journal. Ser. B, Fluids and thermal engineer

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This study focuses on the fundamental characteristics of DME (Dimethyl Ether) combustion, aiming at the development of low-NOx multi-port burner suitable for the tube-nested combustor. In the tube-nested combustion, the water tubes are moved into the furnace closely to the burner to cool the burning flame directly in the field of burning reaction leading to NOx reduction. To prevent the unburned combustibles emission, the diffusion burner used in the tube-nested combustor needs a high performance of the fuel-air mixing. Multi-port burner consists of a fuel-port and surrounding multi-airports , which induce a strong re-circulation flow. Thus the fuel-air mixing is enhanced so that the thermal NOx and CO emissions are significantly reduced. The NOx emission of the DME from the co-axial diffusion burner was over 130 ppm at 0% O 2. On the other hand, NOx emission of DME from the multi-port burner was reduced to 60 ppm at 0% O 2. With the help of the tube-nested combustion, NOx emission of DME was further reduced to 20 ppm at 0% O 2 .

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Robust Design of the Coaxial Jet Cluster Nozzle Burner for DME (Dimethyl Ether) Fuel

Cited by 9 publications

References 0 publications

Low NOx Combustion of DME by Means of Flue Gas Recirculation

Low NOx Combustion of DME by Means of Flue Gas Recirculation

Reduced Chemical Kinetic Reaction Mechanism for Dimethyl Ether-Air Combustion

Development of Low-NOx DME Multi-Port Burner

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