Combustion of hydrocarbon fuels in a bubbling fluidized bed

Baron, Jerzy; Bulewicz, E.M.; Żukowski, Witold; Kandefer, Stanisław; Pilawska, M.

doi:10.1016/s0010-2180(01)00359-5

Cited by 34 publications

(20 citation statements)

References 12 publications

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“…• C, with differences between the readings from different thermocouples down to [20][21][22][23][24][25][26][27][28][29][30] • C. During the rest of the run the top thermocouple, tc-8, at the lowest mean temperature, with medium fluctuations, was near the rapidly undulating surface of the dynamic bed, Fig. 1a (2a) and c, 360-900 s. Figure 2b gives the calculated expanded height of the bed for the whole run and the heights above the distributor of individual thermocouples which reached the maximum temperature at the given point in the run.…”

Section: <100mentioning

confidence: 99%

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Propagation of Reaction Between Bubbles with a Gas Burning in a Fluidised Bed

Baron

Bulewicz

Zabagło

et al. 2011

Flow Turbulence Combust

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A bubbling fluidised bed reactor has been used for investigating how combustion propagates between bubbles of premixed fuel + air, rising from the distributor towards the surface. Earlier work has shown that when the temperature of the sand gradually rises, the gases first burn in flames above the bed, regime A, then combustion moves under its surface, to occur in bubbles travelling up the bed, under regime B. Above a certain temperature, characteristic of the gas mixture composition, combustion descends towards the bottom of the bed. Ignition then occurs in small bubbles near the distributor, under the stable regime C. The kinetic model, used to calculate the delay for thermal ignition inside gas bubbles rising through the bed, gives correct predictions for regimes A and C but not for B. Under regime B, bubbles of the mixture begin to ignite under the bed's surface while their residence time in the bed is remains shorter than the delay times for thermal ignition derived from the kinetic model. As the temperature rises, the ignition delay rapidly decreases, and regime C is reached, in accordance with the model. In this work attention was focused on regime B. A laboratory reactor of quartz glass was used, with a bed of quartz sand. Fast video recording was employed to capture ignition phenomena as the bed's temperature was raised or lowered. Records of freeboard concentrations of O 2 , CO and of total hydrocarbons, VOCs, were obtained, confirming the specific aerodynamic and chemical character of regime B. It has been shown that combustion spreads from the surface to bubbles near the bed's surface and then to other bubbles close by. Such transfer of the reaction stabilizes combustion inside the bed, at temperatures appreciably lower than that for the thermal ignition of the mixture, given by the kinetic model. This is consistent with earlier findings, which have shown that the combustion of gaseous mixtures in bubbling fluidised beds is controlled by gas phase processes, as in flames.

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Section: <100mentioning

confidence: 99%

“…Some results were unexpected. Under regime B the concentrations of NO, NO 2 and CO were linked and the under regime C the NO concentration fell with rising temperature [21,28,29].…”

Section: Supporting Evidencementioning

confidence: 99%

Propagation of Reaction Between Bubbles with a Gas Burning in a Fluidised Bed

Baron

Bulewicz

Zabagło

et al. 2011

Flow Turbulence Combust

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“…The most convenient and effective method of preventing defluidization is to keep the bed temperature from rising above the melting point of the eutectic compositions, which prevents the melting phenomenon (Skrifvars et al, 2005;Yu et al, 2011). As the bed temperature decreases, CO emission also increases to much higher levels than the norms of the regulation (Bahillo et al, 2004;Baron et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Bed agglomeration characteristics of rice straw combustion in a vortexing fluidized-bed combustor

Duan

Chyang

Zhang

et al. 2015

Bioresource Technology

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“…Hemati and coworkers (Dounit et al, 2001(Dounit et al, , 2008Pre et al, 1998) have carried out experimental and modeling studies with natural gas premixed with the air in the windbox. Zukowski and coworkers (Baron et al, 2002, Bulewicz, et al, 2003Zukowski, 1999Zukowski, , 2000Zukowski, , 2002Zukowski, , 2003 have always worked with air-premixing in the plenum chamber, with the exception of hydrogen as fuel, which was fed separately into the sand through six horizontal Ni-Cr hypodermic tubes just above the distributor, whereas only air was in the windbox (Baron et al, 2009). Non-premixed combustion has been attempted in quite a few cases.…”

Section: Gasesmentioning

confidence: 99%

Conversion of liquid and gaseous fuels in fluidized bed combustion and gasification

Miccio

2013

Fluidized Bed Technologies for Near-Zero Emission Combustion and Gasification

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Combustion of hydrocarbon fuels in a bubbling fluidized bed

Cited by 34 publications

References 12 publications

Propagation of Reaction Between Bubbles with a Gas Burning in a Fluidised Bed

Propagation of Reaction Between Bubbles with a Gas Burning in a Fluidised Bed

Bed agglomeration characteristics of rice straw combustion in a vortexing fluidized-bed combustor

Conversion of liquid and gaseous fuels in fluidized bed combustion and gasification

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