Burning droplets of heavy oil residual blended with diesel light oil: Characterization of burning steps

Xu, Guangwen; Ikegami, Machiko; Honma, Senji; Ikeda, Kota; Nagaishi, Hiroshi; Takeshita, Yuji

doi:10.1080/714922711

Cited by 14 publications

(41 citation statements)

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“…Xu et al (2002) [22] Kobayasi et al (1955) [24] Suspended droplet on a quartz fiber, droplet diameter (0.6 -1.8mm) [22] -(0.7 -1.7) [24] .…”

Section: Suspended Droplet Reviewmentioning

confidence: 99%

“…The entire process of burning a heavy oil droplet was investigated [22] . The combustion of fuel droplets was investigated experimentally by means of motion pictures [24] .…”

Section: -1183kmentioning

confidence: 99%

“…In particular, the first method was the single falling droplet experiment which was more oriented toward studying cenosphere characteristics and formation [1,10,[13][14][15][16][17][18]. The second method was based on a suspended droplet which had an advantage in studying the area of general combustion characteristics covering the burning of the volatile constituents to the solid residue [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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PM from the combustion of heavy fuel oils

Elbaz

Khateeb

Roberts

2018

Energy

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This work presents an experimental study investigating the formation and oxidation of particulate matter from the combustion of heavy fuel oil, HFO, droplets. The study includes results from both a falling droplet in a drop tube furnace and a suspended droplet in a heated convective flow. The falling droplets in a heated coflow air with variable temperature path and velocity were combusted and the resulting particles, cenospheres, were collected. To characterize the microstructure of these particles, scanning electron microscopy (SEM), and energy dispersive X-Ray (EDX) analysis were used. The particles were found to have either a porous or a skeleton/membrane morphology. The percentage of particles of either type appears to be related to the thermal history, which was controlled by the heated co-flow velocity. In the suspended droplet experiments, by suspending the droplet on a thermocouple, the temperature inside the droplet was measured while simultaneously imaging the various burning phases. A number of specific phases were identified, from liquid to solid phase combustion are presented and discussed. The droplet ignition temperature was seen to be independent of the droplet size. However, the liquid phase ignition delay time and the droplet lifetime were directly proportional to the initial droplet diameter.

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“…Xu et al (2002) [22] Kobayasi et al (1955) [24] Suspended droplet on a quartz fiber, droplet diameter (0.6 -1.8mm) [22] -(0.7 -1.7) [24] .…”

Section: Suspended Droplet Reviewmentioning

confidence: 99%

“…The entire process of burning a heavy oil droplet was investigated [22] . The combustion of fuel droplets was investigated experimentally by means of motion pictures [24] .…”

Section: -1183kmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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PM from the combustion of heavy fuel oils

Elbaz

Khateeb

Roberts

2018

Energy

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“…In combustion of light diesel oil and heavy oil residue mixtures, Xu et al [3] observed two distinct combustion phases with different evaporation rate which were volatile liquid-phase evaporation and oxidation of solid soot and coke upon flame extinction. In liquid evaporation phase, the burning rate follows the regression of their volatile component and eventually decreases…”

Section: Introductionmentioning

confidence: 99%

Combustion characteristics and liquid-phase visualisation of single isolated diesel droplet with surface contaminated by soot particles

Rasid

Zhang

2019

Proceedings of the Combustion Institute

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“…Its burning time is equal to about half of the whole lifetime of the droplet [1, 2]. It has been established that with increasing temperature the combustion phase of the carbon residue becomes dominant and the residue itself becomes less porous and harder [3,4]. Combustion of the fuel oil carbon residue can be compared to solid fuel combustion.…”

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confidence: 99%

Behavior of a fuel oil droplet on a hot surface

Kalpokaite-Dichkuvene

Stravinskas

2006

J Eng Phys Thermophys

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536.24Combustion of a fuel oil droplet on a hot oblique surface, whose temperature varies between 350 and 700 o C, has been studied experimentally. The influence of the heat conductivity of the wall and its roughness, as well as of the droplet-surface contact angle on the fuel combustion time has been determined. The data on the change in the droplet mass in the process of combustion are presented and chromatographic analysis of the fuel has been performed.Introduction. Combustion of a fuel oil droplet freely flying in a hot medium has been studied fairly widely and broken up into several stages. The first stage is droplet heating. Components, whose boiling temperature is comparatively low, evaporate not only from the surface but also from the center of the droplet. During this stage the droplet is often inflated. The released volatile substances ignite, and the additional heat determines the further decomposition of the fuel. Upon burning of volatile substances, more viscous compounds remain and form a spatial porous residue. Its burning time is equal to about half of the whole lifetime of the droplet [1, 2]. It has been established that with increasing temperature the combustion phase of the carbon residue becomes dominant and the residue itself becomes less porous and harder [3,4]. Combustion of the fuel oil carbon residue can be compared to solid fuel combustion. In [1,5,6], it was shown that at low temperatures and small particles evaporation of volatiles and heterogeneous combustion of a carbon particle occur simultaneously, since the concentration of oxygen is comparatively large. Not only surface but also internal combustion is possible. With increasing temperature or increasing particle diameter, homogeneous combustion of volatile substances occurs at a distance from the particle surface, which impedes the inflow of oxygen, and internal combustion is retarded. However, the burning hydrocarbons heat the particle surface, where pyrolysis and polymerization are observed. Moreover, during combustion of volatiles the particle or fuel oil temperature strongly increases, and because of the thermal stresses particle fragmentation is possible [1,6,7].Sometimes in technological facilities, cases where the fuel droplet interacts with a solid surface are observed. Because of the deficiency of heat, the droplet of a fuel oil containing about 85% carbon burns only partially; therefore, after some time on the surface a coke layer impairing the operation of the facility is formed.The droplet-surface interaction is being studied extensively. The photographs presented in [8,9] show the dynamics of a droplet impacting a surface. It has been found that the physical properties of a liquid, as well as the rate of motion of a droplet, determine whether the droplet will break up into several smaller parts or will bounce from the surface as a whole mass. The influence of wall parameters, such as its temperature, roughness, and physical properties, on the behavior of a fuel droplet and its evaporation time is also investigated [1...

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Burning droplets of heavy oil residual blended with diesel light oil: Characterization of burning steps

Cited by 14 publications

References 0 publications

PM from the combustion of heavy fuel oils

PM from the combustion of heavy fuel oils

Combustion characteristics and liquid-phase visualisation of single isolated diesel droplet with surface contaminated by soot particles

Behavior of a fuel oil droplet on a hot surface

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