Simultaneous ignition of several droplets of coal–water slurry containing petrochemicals in oxidizer flow

Glushkov, Dmitrii O.; Кузнецов, Г. В.; Стрижак, П. А.

doi:10.1016/j.fuproc.2016.05.045

Cited by 22 publications

(5 citation statements)

References 34 publications

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“…The main effects for a single droplet were taken into account in the development of the model presented in this paper. The group effects of the mutual influence of neighboring droplets on each other play an important role when the distances between them are less than 5-7 initial diameters [70][71][72][73]. Moreover, this mutual influence is enhanced with an increase in the heat fluxes to the surface of droplets, their mutual arrangement with vapor leakage from the surface of one droplet to neighboring ones, transformation of the surfaces of droplets and change in their shape (oblate or elongated ellipsoids), their swirling, as well as increased thermal diffusivity, reduced viscosity and surface tension of liquids.…”

Section: Materials Physical Propertiesmentioning

confidence: 99%

Heat and Mass Transfer Processes and Evaporation of a Liquid Droplet on a Structured Surface

Antonov,

Islamova,

Orlova

2023

Energies

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The characteristics of water droplet heating and evaporation on structured hydrophobic and hydrophilic surfaces in the range of static contact angles from 73° to 155° were studied experimentally using high-speed video recording. Two fundamentally different technologies for applying coatings on a metal surface were used in comparison with the results on a polished surface. Microscopic studies were conducted to identify the features of the formed coatings. The wetting properties were characterized by means of the static contact angle and the contact angle hysteresis: on polished surface No. 1 (contact angle—73°, hysteresis—11°), on structured surface No. 2 (contact angle—125°, hysteresis—9°), and on structured surface No 3 (contact angle—155°, hysteresis—7°). The experimental dependences of the droplet evaporation rate on the different surfaces under normal conditions (ambient air temperature—293 K, atmospheric pressure, humidity—35%) were obtained. The evaporation regimes of droplets on the surfaces under study were identified. Water droplets evaporated in the pinning mode on surfaces No. 1 and No. 2. When a water droplet evaporated on surface No 3, the droplet was in the constant contact angle regime for ≈90% of its lifetime. Based on the experimental data obtained, a two-dimensional model of conjugate heat and mass transfer was developed, which describes the heating and evaporation of a liquid droplet on structured hydrophobic and hydrophilic surfaces at a wide range of contact angles. Satisfactory agreement was obtained between the numerical simulation results and experimental data. Using the model, the fields of temperature, concentration and other key characteristics were established at different points in time. Recommendations for its application in the development of gas–vapor–droplet applications were formulated.

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Section: Materials Physical Propertiesmentioning

confidence: 99%

Heat and Mass Transfer Processes and Evaporation of a Liquid Droplet on a Structured Surface

Antonov,

Islamova,

Orlova

2023

Energies

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“…The explosion mechanism of an IPN cloud is illustrated in Figure 2 [3,63]. The explosion mechanism can be simplified into four parts: droplet breakup, inert heating, vaporization, and chain explosion of the evaporating species.…”

Section: Reaction Kinetic Modelmentioning

confidence: 99%

Energy Output of High‐speed Flowing Two‐phase IPN/Air in the Combustion Chamber

Wan

Wen

Zhang

2022

Propellants Explo Pyrotec

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Fuel-air cloud explosions or detonations are often affected by initial ambient conditions. A two-dimensional (2D) semi-confined model was established to study the effects of the inflowing air temperature and initial temperature of the combustor on the explosion process of isopropyl nitrate (IPN)/air mixture. The results showed that at different initial temperatures (1000-3000 K), the first peak pressure (P 1 ) and second peak pressure (P 2 ) decreased with the increase in initial temperature; the maximum flame temperature (2338-3534 K) increased with the increasing initial temperature; the explosion pressure and temperature had the opposite trends with the initial temperature, indicating that the oxygen content in the combustor had a greater impact on the explosion pressure, while the initial temperature had a more significant effect on the flame temperature. Under different incoming air temperatures (1000-3000 K), the flame temperature (~2700 K) of the two-phase explosion had a small difference at the incoming temperature of � 2500 K, signifying that the airflow temperature (< 3000 K) and the oxygen content in air jointly dominated the flame temperature; the flame temperature was 3100 K at the incoming temperature of 3000 K, which was about 300 K higher than other incoming flow temperatures, indicating that the flame temperature was more sensitive to the incoming air temperature (� 3000 K). At 600 m/s airflow, the explosion parameter curves at the inflow temperatures of 300 K and 600 K were compared, and the critical inflow temperature of the explosion process was also investigated.

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“…and organic solid wastes (petrochemical and coal–chemical wastes, municipal solid waste, organic sludge, biomass-like solid waste, etc. ), which would bring serious threats to the ecological environment. − Accordingly, oil, organic solvents, and wastewater (industrial wastewater, petroleum and coal processing wastewater, sewage sludge wastewater, etc.) can be used as substitutes for the aqueous medium to efficiently recycle the heat value and deal with pollutants. − The inorganic matters in CWS can be deposited in slag and fly ash after combustion and gasification, and the organic substances can be converted chemically or burned directly to generate electricity.…”

Section: Introductionmentioning

confidence: 99%

Review and Perspectives of Anionic Dispersants for Coal–Water Slurry

Feng

et al. 2023

Energy Fuels

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Dispersants are chemical moieties that modify interfacial characteristics by adsorption at the solid–liquid interface, and they have been widely used in modern industrial production. This review focuses on the research and perspectives of anionic dispersants for coal–water slurry (CWS). Various common anionic dispersants are briefly summarized, including natural and synthetic species. The interactions between coal particles in the CWS suspension, including van der Waals attraction and electrostatic repulsion, are described by the DLVO (Derjaguin–Landau–Verwey–Overbeek) theory. Due to the hydrophobic interaction and the steric effect resulting from the adsorption of polymer dispersants, the extended DLVO theory is introduced to elucidate the various interactions in the CWS system. Based on the interactions between the coal particles, the adsorption behaviors at the coal–water interface, and the interactions between coal and water, the dispersion and stabilization mechanisms are systematically and theoretically discussed. According to the variations of interaction energies between the coal particles, the use of anionic polymer dispersants can weaken the hydrophobic attraction and enhance the steric hindrance and electrostatic repulsion. Also, the rheological behaviors of CWSs are outlined, with emphasis on the pipeline transportation of CWS and the three-parameter Herschel–Bulkley model. Additionally, the properties of anionic dispersants for CWS can be improved by adjusting their chemical structures such as molecular weight, side chain length, rigidity and flexibility of the molecular chain, and variety, quantity, position, and proportion of hydrophobic and hydrophilic groups. In view of the relationships between the structure and property, a direction on the selection and preparation of dispersant for CWS is suggested. Finally, the current challenges and future perspectives of dispersants for CWS are put forward.

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Simultaneous ignition of several droplets of coal–water slurry containing petrochemicals in oxidizer flow

Cited by 22 publications

References 34 publications

Heat and Mass Transfer Processes and Evaporation of a Liquid Droplet on a Structured Surface

Heat and Mass Transfer Processes and Evaporation of a Liquid Droplet on a Structured Surface

Energy Output of High‐speed Flowing Two‐phase IPN/Air in the Combustion Chamber

Review and Perspectives of Anionic Dispersants for Coal–Water Slurry

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