Influence of the initial temperature of coal water slurries containing petrochemicals on their ignition characteristics

Vershinina, K. Yu.; Shlegel, N.E.; Стрижак, П. А.

doi:10.1016/j.applthermaleng.2018.04.095

Cited by 9 publications

(7 citation statements)

References 52 publications

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“…When cooled from 20 to 0 °C, liquid CWSP (a mixture of fine coal processing waste, water, and oil) was found to have 11–35% lower ignition delay times under radiant heating. Vershinina et al concluded that when droplets of such fuels with a relatively low initial temperature T 0 = 0 °C are heated, there is a big temperature gradient at their surfaces, as compared to identical heating conditions of fuel droplets at T 0 = 20 °C. As 80% of t d is fuel droplet heating time, more intense heating decreases the duration of the induction period .…”

Section: Introductionmentioning

confidence: 99%

“…Vershinina et al concluded that when droplets of such fuels with a relatively low initial temperature T 0 = 0 °C are heated, there is a big temperature gradient at their surfaces, as compared to identical heating conditions of fuel droplets at T 0 = 20 °C. As 80% of t d is fuel droplet heating time, more intense heating decreases the duration of the induction period . Irrespective of the fuel initial temperature, the minimum temperature of heated air necessary for ignition to occur remains almost the same.…”

Section: Introductionmentioning

confidence: 99%

“…The aggregate condition, structure, and properties of gel fuels and of the above combustible liquids differ significantly. Therefore, the known results − cannot be applied to predict the patterns and characteristics of gel fuel ignition, including gels cooled to negative Celsius values.…”

Section: Introductionmentioning

confidence: 99%

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Effects of the Initial Gel Fuel Temperature on the Ignition Mechanism and Characteristics of Oil-Filled Cryogel Droplets in the High-Temperature Oxidizer Medium

et al. 2019

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The ignition mechanism was studied for a group of gel fuel compositions in a high-temperature oxidizer medium. It was determined how the initial temperature of the fuel influences the ignition characteristics. The gel fuel (oil-filled cryogel) was prepared from an oil emulsion based on the mixture of a combustible liquid and polyvinyl alcohol. The composition of primary oil emulsions was as follows: the aqueous solution of polyvinyl alcohol (5, 10 wt %) + 40–60 vol % of oil + 2 vol % of emulsifier. The initial temperature of gel fuels ranged from 188 to 293 K. Combustion was initiated in high-temperature motionless air at 873–1273 K. Using a high-speed video recording system, we established that at different initial temperatures of the gel fuel, a set of identical processes occurs during the induction period; these are different from the same physical and chemical processes during the ignition of a combustible liquid. After reaching threshold conditions, the flame spreads in the droplet’s vicinity from a hot spot through the gas mixture. Hot spot is an ignited and a small-sized fragment separating and moving away from the molten fuel droplet as a result of a microexplosion. The values of the main process characteristicignition delay timesdiffer 25–95% for fuel samples with the initial temperature of 293 K and temperatures of 188–233 K because of a long heating and melting stage of the latter. This is explained by a 2.5–3.6-fold difference in the amount of energy, which is necessary to supply to a colder fuel sample for this phase transformation to occur, other things being equal.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of the Initial Gel Fuel Temperature on the Ignition Mechanism and Characteristics of Oil-Filled Cryogel Droplets in the High-Temperature Oxidizer Medium

et al. 2019

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“…A muffle tube furnace (model combustion chamber) was used for the combustion of fuel samples. A detailed description of the experimental setup, procedure, measuring devices and errors is given in [10,11]. The heating temperature was varied from 350 °C to 1000 °C.…”

Section: Experimental Setup and Methodsmentioning

confidence: 99%

“…In this study we measured ignition delay times (τd); minimum ignition temperatures (Tg min ) for each fuel sample. The time characteristics of the ignition were determined by the fuel luminosity in accordance with the procedure described in [10,11]. This procedure is based on the comparison of the luminosity of the fuel sample during the reaction with the reference values obtained using high-precision and low-inertia thermocouples.…”

Section: Experimental Setup and Methodsmentioning

confidence: 99%

Utilization of Oil and Coal Industrial Waste by Combustion in the Form of Slurry and Granulate

Стрижак¹,

Vershinina²,

Romanov³

et al. 2019

Proceedings of the 4th World Congress on Momentum, Heat and Mass Transfer

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A lot of industrial waste is generated annually throughout the world. The extractive and processing industries are traditional leaders in the field of waste generation. According to the minimum estimates, several hundred million tons of coal processing and refining wastes are generated every year in the world. More than 2 billion tons of these wastes have already been accumulated. An important global goal is the effective, large-scale and safe recycling of industrial wastes. One of the ways to achieve this goal is to develop useful technologies of combustion of industrial wastes as composite fuels. Fuels prepared on the basis of coal processing waste, rapeseed oil, used turbine oil were considered in this study. We tested three forms of waste derived fuels: slurry, dried slurry (after storage) and granulate. Energy, environmental, economic aspects of the use of these fuels were under study. We determined the time and temperature parameters of ignition and combustion of the tested fuels using a laboratory muffle furnace (at 350-1000 °C). The concentrations of dangerous sulphur and nitrogen oxides, contained in combustion products, were also measured. It was established that the granulated fuels have minimum ignition temperatures and ignition delay times (50-80% lower than for the slurry and dried slurry). However, the combustion of waste derived slurries is characterized by minimum concentrations of NOx and SOx (by 18-75% lower than in the granulated state). Taking into account the cost, we calculated the efficiency of the tested fuels in comparison with traditional coal. According to the integral relative parameters, the use of waste-derived slurries is most attractive. The results of the research can be used in the thermal engineering to develop efficient (by energy, environmental and economic parameters) heat and power generation technologies by combustion of composite fuels derived from industrial waste.

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The prospects of burning coal and oil processing waste in slurry, gel, and solid state

Vershinina

Nyashina

Dorokhov

et al. 2019

Applied Thermal Engineering

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Influence of the initial temperature of coal water slurries containing petrochemicals on their ignition characteristics

Cited by 9 publications

References 52 publications

Effects of the Initial Gel Fuel Temperature on the Ignition Mechanism and Characteristics of Oil-Filled Cryogel Droplets in the High-Temperature Oxidizer Medium

Effects of the Initial Gel Fuel Temperature on the Ignition Mechanism and Characteristics of Oil-Filled Cryogel Droplets in the High-Temperature Oxidizer Medium

Utilization of Oil and Coal Industrial Waste by Combustion in the Form of Slurry and Granulate

The prospects of burning coal and oil processing waste in slurry, gel, and solid state

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