Hydrothermal methanol diffusion flame as internal heat source in a SCWO reactor

Wellig, Beat; Weber, Markus; Lieball, K.; Prikopsky, Karol; Rohr, Philipp Rudolf von

doi:10.1016/j.supflu.2008.11.021

Cited by 90 publications

(107 citation statements)

References 52 publications

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“…4 c, the ignition temperatures for a series of fuel concentration experiments are summarized. Not surprisingly, the ignition temperature decreases with increasing fuel concentration, which is consistent with previous studies [34][35][36][37]. The ignition temperature is approximately 600°C at a fuel concentration of 22 wt %, while the fuel at 43 wt % can be ignited at a temperature as low as 460°C.…”

Section: Effects Of the Operating Parameters On The Ignition Temperatsupporting

confidence: 91%

Experimental Study on the Ignition and Extinction Characteristics of the Hydrothermal Flame

Zhang

et al. 2015

Chem Eng & Technol

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An inner-preheating transpiring-wall reactor with a hydrothermal flame was designed and tested to avoid plugging in the preheating section. Hot water was used as auxiliary heating fluid to preheat the fuel to the ignition temperature. This work focused on the flame characteristics (i.e., the ignition and extinction processes, the ignition and extinction temperatures) inside the inner-preheating transpiring-wall reactor. The result shows that higher fuel concentrations and fuel flows permit lower ignition temperatures. The results of the nozzle configuration experiments show that lower velocities provide resistance to extinction.

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Section: Effects Of the Operating Parameters On The Ignition Temperatsupporting

confidence: 91%

Experimental Study on the Ignition and Extinction Characteristics of the Hydrothermal Flame

Zhang

et al. 2015

Chem Eng & Technol

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“…Hence 400K can be regarded as the extinction temperature at this condition. However, for 12% methanol solution, the experimental extinction temperature is about 650K [7], which is much higher than this modeled value. This deviation may be caused by the unsuitable chemical Arrhenius coefficients from the Fluent database.…”

Section: Resultsmentioning

confidence: 54%

“…The reactor configuration investigated in this study is the coaxial hydrothermal burner developed in ETH [7]. Considering the axisymmetric characteristic, half of the axial section is meshed as the calculation zone, as shown in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

“…Recent years, other utilizations of hydrothermal flame were also proposed, such as thermal spallation drilling [4] and high-pressure direct-fired steam-gas generator (HDSG) [5]. Ignition and extinction temperatures are the two most investigated characteristics upon hydrothermal flames [6,7]. It was proved that the ignition and extinction temperatures vary with the configuration of reactors [8], actually the flow patterns.…”

Section: Introductionmentioning

confidence: 99%

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Ignition and Extinction Modeling of Hydrothermal Flames

Ren¹,

Wang²,

Yang³

2017

Proceedings of the 2017 5th International Conference on Machinery, Materials and Computing Technology (ICMMCT 2017)

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Abstract.A modeling research is conducted for a coaxial hydrothermal combustor. The single eddy-dissipation model and finite-rate vs. eddy-dissipation model are used comparably. The latter is proved to be more precise to reflect the flow-reaction feature near the nozzle and able to predict the ignition and extinction temperatures. Large discrepancy between fuel and oxygen inlet velocities results to a recirculation zone in the reactor, which plays an important role in ignition and flame stability. Since the recirculation zone decrease with the increase in fuel concentration, the ignition temperature of 60% methanol is even higher than that of 30% methanol. The predicted extinction temperature is lower than the experimental data, which may be caused by the unsuitable of the chemical reaction model from the Fluent database.

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“…Furthermore, when temperatures are above 600°C, reactions can take as little as a few milliseconds (Augustine & Tester, 2009;Bermejo et al, 2011;Cabeza et al, 2011;Narayanan et al, 2008;Wellig et al, 2009). Longer residence time can improve gasification thoroughness, but there is also an inverse relationship between temperature and reaction completeness, dropping from a few minutes below 600°C to a few seconds above 600°C (Cao et al, 2011).…”

Section: Effects Of Temperature Pressure and Residence Timementioning

confidence: 99%