Engineering equations for determining coal-water fuel combustion stages

Pinchuk, V.A.; Sharabura, T.A.; Kuzmin, A. V.; Pinchuk, S.A.

doi:10.1016/j.joei.2020.04.007

Cited by 15 publications

(3 citation statements)

References 29 publications

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“…As a result, the number of small droplets increases, which greatly simplifies their further ignition. The maximum value of the ignition delay time for the liquid hydrocarbon sample was recorded at T g = 450 • C. At increased air temperature (from 450 • C to 700 • C), the ignition delay time decreased from 19.2 to 1.1 s and exhibited an exponential dependence, which agrees with the results obtained by other authors [55]. It should be noted that at the air temperature ranging from 450 to 550 • C, the t i parameter was observed to decrease more intensively.…”

Section: Spraysupporting

confidence: 91%

Steam Pyrolysis of Oil Sludge for Energy-Valuable Products

et al. 2022

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Experimental studies of the steam pyrolysis of oil sludge were performed using a flow-type pilot plant with 300 kg/h capacity (raw material) to obtain energy-valuable products, such as liquid hydrocarbons (30.4 wt%), semi-coke (39.6 wt%), non-condensable gas-phase compounds (26.5 wt%), and bitumen (3.5 wt%). The pyrolysis process was conducted at a temperature of 650 ° C and with a steam flow rate of 150 kg/h. Liquid hydrocarbons were considered a target product. Comprehensive studies of their physicochemical characteristics, atomization process, droplet ignition, and combustion were carried out. The studied sample had physicochemical characteristics similar to traditional fuel oil (calorific value—42.6 MJ/kg, sulfur content—0.8 wt%). The jet spraying angle was 25° in view of the improved rheological properties of the test sample, with a homogeneous jet structure and a predominant droplet diameter of no more than 0.4 mm. The flame combustion process was accompanied by the formation of microexplosions, the frequency and intensity of which depended on the temperature of the air (Tg = 450–700 °C). This study, in view of its applied nature, is of interest in the design of new installations and technological systems for hydrocarbon pyrolysis.

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Section: Spraysupporting

confidence: 91%

Steam Pyrolysis of Oil Sludge for Energy-Valuable Products

et al. 2022

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“…In addition, Figure 4 contains the results of experimental data generalization in the form of criterion equations obtained on the basis of recommendations given in. 51,52 These equations have the following form:…”

Section: Resultsmentioning

confidence: 99%

“…Both Figures 3 and 4 are obtained by processing the experimental results. In addition, Figure 4 contains the results of experimental data generalization in the form of criterion equations obtained on the basis of recommendations given in 51,52 . These equations have the following form:

λ_{\max} = 0.19 {\overset{false¯}{F}}_{normala . normaln .}^{a_{italic1}} ((), 28 - 6 π^{*}) e^{a_{2} {\overset{false¯}{R}}_{d}}, at 1 \leq π^{*} < 2,

λ_{\max} = ((), 59 - 19 π^{*}) ((), 38 - 158 {\overset{false¯}{F}}_{normala . normaln .}) {\overset{false¯}{R}}_{d}^{a_{italic3}} {(35 - 142 {\overset{F}{true}}_{a . n .})}^{a_{italic4}}, at 2 \leq π^{*} \leq 3,

λ_{\min} = 72 π^{* a_{5}} {\overset{false¯}{F}}_{normala . normaln .}^{a_{6}} {\overset{false¯}{R}}_{d}^{a_{7}} ((), 18 {\overset{false¯}{F}}_{normala . normaln .}^{2} - 6.3 {\overset{false¯}{F}}_{normala . normaln .} + 0.6), at 0.12 \leq {\overset{false¯}{F}}_{normala . normaln .} < 0.18,

…”

Section: Resultsmentioning

confidence: 99%

Criterion analysis and experimental study of combustion mechanisms in a bidirectional swirling flow and their relationship with pollutants emission

Guryanov

Евдокимов

Guryanova

et al. 2020

Intl J of Energy Research

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Summary This paper reports on the theoretical and experimental studies of combustion in a bidirectional swirling flow to develop its criterion base. Based on considering known aero‐thermochemical similarity criteria, turbulent combustion numbers were calculated for the bidirectional vortex combustor for the first time. Theoretical assessment and experimental studies of the probability of the known combustion mechanisms' implementation in a limited bidirectional swirling flow, containing the secondary flows and separation phenomena, were performed. This gave us a possibility to provide the new correlation of combustion mechanisms with emission dependencies. A joint review of these data allowed us to establish that the greatest environmental efficiency is observed in the range of the air‐fuel equivalence ratio of 1.5 < λ < 1.9. At the same time, it was defined that stable combustion of liquid fuel in the bidirectional swirling flow is available up to the value λ = 22. Moreover, criterion equations for lean and rich limits of stable combustion were obtained.

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