Influence of the shape of soaring particle based on coal-water slurry containing petrochemicals on ignition characteristics

Valiullin, Timur; Strizhak, A Pavel

doi:10.2298/tsci160218082v

Cited by 9 publications

(8 citation statements)

References 20 publications

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“…In particular, the database of reliable kinetic constants is expanded, which is based on a set of papers published over the last 20 years, e. g. we can underline works [34][35][36][37][38]. The development of laboratory-based measurement equipment will help us take major steps to create a unified database of thermophysical and thermokinetic characteristics of widely used solid and composite fuels [39][40][41].…”

Section: Resultsmentioning

confidence: 99%

Thermal decomposition and oxidation of coal processing waste

2018

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To expand the database of kinetic parameters used for modeling the ignition of coals and their processing waste, promising coal-water slurry and coal-water slurry containing petrochemicals, studies have been performed on an experimental setup using thermal gravimetric analysis. The research into coals of various ranks (flame, gas, coking, low-caking, and non-baking) and their processing waste (filter cakes) has yielded the decomposition parameters of the organic matter of coal and the formation of volatile substances as well as the oxidation parameters of the coke residue of all the coals and filter cakes under study. The studies cover the temperature range of the burning processes: 450-1300 K (for low-, medium-, and high-temperature burning modes). We have ascertained the dependence of kinetic parameters (pre-exponential factor and activation energy) describing the thermal decomposition of the organic matter of coal on the rank of coals and filter cakes. The findings show that the kinetic parameters describing the thermal decomposition of the organic matter of coal and its processing waste are practically the same. The thermokinetic parameters of coke residue oxidation are close for all the coals under study but they differ significantly for coke residue of filter cakes. The values of thermokinetic parameters obtained in the research are necessary to devise adequate physical and mathematical models and perform numerical studies (for mathematical modeling) of fuel slurry combustion processes in the combustion chambers of power plants.

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Section: Resultsmentioning

confidence: 99%

Thermal decomposition and oxidation of coal processing waste

2018

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“…Owing to the features and limitations identified above, it is advisable to develop an experimental method that ensures a soar of particle (for a single one, small group and a flow of CLF particles) of the fuel composition in a flow of heated air with the ability to control its ignition and combustion processes (using high-speed video recording). The results of studies using a specialized model combustion chamber can be found in [16,17]. It is shown that the conditions of the experiments [16,17] correspond closely to furnaces of thermal power plants, boiler houses, and other power plants, as the fuel particles in them soar after injection into the combustion chamber by the nozzle.…”

Section: Introductionmentioning

confidence: 94%

Ignition of Slurry Fuel Droplets with Different Heating Conditions

2019

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This paper describes modern research methods of the ignition and combustion processes of slurry fuel droplets. The experiments were carried out using a muffle furnace to ensure the conditions of radiation heating, the hot surface to reproduce the conditions of conductive heating, the high-temperature channel with convective heating, the chamber with the processes of soaring, i.e., a significant increase in the time of fuel residence in the combustion chamber. We identified the differences in combustion modes, threshold ignition temperatures, delay times and durations of combustion processes. We obtained the quantitative differences in the characteristics of the ignition and combustion processes for typical registration methods. It was found that for all heating schemes, the minimum ignition temperatures have comparable values. Minimum ignition delay times were recorded during convective heating. The maximum combustion temperatures were achieved with radiation heating. We determined the values of limiting heat fluxes, sufficient to initiate the combustion of slurries fuels during conductive, convective and radiative heating.

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“…Therefore, to determine differences between the integral characteristics, the experiments were held with different shapes of droplets (sphere, ellipsoid and polyhedron). It has been found that the polyhedron droplets are characterized by minimal ignition delay time, which is associated with an increased contact area due to numerous ledges [28].…”

Section: Differences In the Characteristics Of Ignition Of Slurry Fuementioning

confidence: 99%

Igniting Soaring Droplets of Promising Fuel Slurries

et al. 2019

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High rates of environmental pollution by boilers and thermal power plants burning coal of different grades are the main reason for active research in the world aimed at the development of alternative fuels. The solution to the formulated problem acceptable in terms of environmental, technical and economic criteria is the creation of composite slurry fuels with the use of fine coal or coal processing and enrichment waste, water of different quality, and oil sludge additive. This study considers modern technologies of burning slurry fuels as well as perspective research methods of the corresponding processes. A model combustion chamber is developed for the adequate study of ignition processes. The calculation of the basic geometric dimensions is presented. The necessity of manufacturing the combustion chamber in the form of an object of complex geometry is substantiated. With its use, several typical modes of slurry fuel ignition are determined. Principal differences of ignition conditions of a single droplet and group of fuel droplets are shown. Typical vortex structures at the fuel spray injection are shown. A comparison with the trajectories of fuel aerosol droplets in real combustion chambers used for the combustion of slurry fuels is undertaken.

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Influence of the shape of soaring particle based on coal-water slurry containing petrochemicals on ignition characteristics

Cited by 9 publications

References 20 publications

Thermal decomposition and oxidation of coal processing waste

Thermal decomposition and oxidation of coal processing waste

Ignition of Slurry Fuel Droplets with Different Heating Conditions

Igniting Soaring Droplets of Promising Fuel Slurries

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