Physicochemical features of the effect of special water-based fire retardants on forest materials

Кузнецов, Г. В.; Islamova, Anastasia; Orlova, E.G.; Стрижак, П. А.; Feoktistov, D.V.

doi:10.1016/j.firesaf.2021.103371

Cited by 12 publications

(3 citation statements)

References 39 publications

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“…The gas cavities in the surface defects of coal particles are the points of stress concentration on the liquid surface. Using shadowgraphy [46], the wettability properties of the materials under study were determined. The data in Table 2 are based on the results of measuring the contact angle of pressed pellets from particles of the above ranks of coal ground to 60 µm and their monolithic processed fragments.…”

Section: Methodsmentioning

confidence: 99%

Interaction between Droplets and Particles as Oil–Water Slurry Components

et al. 2022

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The characteristics of the collisions of droplets with the surfaces of particles and substrates of promising oil–water slurry components (oil, water and coal) were experimentally studied. Particles of coals of different ranks with significantly varying surface wettability were used. The following regimes of droplet–particle collisions were identified: agglomeration, stretching separation and stretching separation with child droplets. The main characteristics of resulting child droplets were calculated. Droplet–particle interaction regime maps in the B = f(We) coordinates were constructed. Equations to describe the boundaries of transitions between the droplet–particle interaction regimes (B = nWek) were obtained. The calculated approximation coefficients make it possible to predict threshold shifts in transition boundaries between the collision regimes for different fuel mixture components. Differences in the characteristics of secondary atomization of droplets interacting with particles were established. Guidelines were provided on applying the research findings to the development of technologies of composite liquid fuel droplet generation in combustion chambers with the separate injection of liquid and solid components, as well as technologies of secondary atomization of fuel droplets producing fine aerosol.

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Section: Methodsmentioning

confidence: 99%

Interaction between Droplets and Particles as Oil–Water Slurry Components

et al. 2022

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“…Such technology often uses special flocculants, so the solid particles were covered with wetting agents. These substances reduce the contact angle and increase the agglomeration of liquid droplets and solid particles [49]. Under such conditions, the breakup of composite droplets requires more outside effort than for droplets containing coal particles.…”

Section: Droplet Behaviorsmentioning

confidence: 99%

Limiting Conditions for Droplet Fragmentation of Stabilized Suspension Fuels

2022

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The main barrier to the wide use of composite liquid fuels in the energy sector is the significant sedimentation of solid particles during fuel storage and transportation. As a result, the composition of fuel slurries changes quite fast and considerably when yet another portion of fuel is pumped from a storage tank. Stabilizing additives are one of the possible solutions to this problem. The technology of primary and secondary slurry fuel atomization is generally considered promising for obtaining a spray of small fragments (droplets and particles). This way, droplets of liquid components and solid particles can be produced with a size of less than 10 μm. A fuel aerosol with particles and droplets this small burns out rapidly. The most effective secondary droplet atomization technology is based on their microexplosive breakup in combustion chambers by superheating the water in the fuel to exceed its nucleation (boiling) point. As part of this research, we studied the impact of the main stabilizing additives to slurry fuels on droplet breakup behavior: heating time until breakup, breakup delay and duration, and the number, size, and velocities of secondary fragments. Soy lecithin and sodium lignosulfonate were used as stabilizers. The main components of the fuel slurries were water, rapeseed oil, diesel fuel, coal processing waste (filter cake), coking bituminous coal, soy lecithin, and sodium lignosulfonate. Droplets were heated at an ambient gas temperature ranging from 450 to 1050 K until the breakup conditions were achieved. Mathematical expressions were obtained for the relationship between input parameters and the key characteristics of the process. Principal differences and overall patterns of droplet breakup were established for slurries with and without stabilizing additives.

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“…4,5 The previous literature reported that addition of soluble chemical additives (surfactant and phosphorus-nitrogen active salts) could remarkably improve the re-ghting performance, owing to the improved wetting, penetrating, and active free radical quenching ability surrounded the surface fuels. 6,7 Nevertheless, such extinguishing agents cannot form a compact carbonaceous protective layer on the solid fuel substrates, which limits their re suppression efficiency.…”

Section: Introductionmentioning

confidence: 99%