Computational modeling of the combustion of coal water slurries containing petrochemicals

Chernetskiy, M. Yu.; Vershinina, K. Yu.; Стрижак, П. А.

doi:10.1016/j.fuel.2018.02.006

Cited by 17 publications

(8 citation statements)

References 30 publications

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“…From the ash composition in Table , it can be found that the ash of SS contains a certain amount of K 2 O, while the ash of BC contains Na 2 O. According earlier studies, the addition of some metal and metal oxides (e.g., Al, TiO 2 , K 2 O, and Na 2 O) is beneficial for combustion; especially, K 2 O has the strongest catalytic effect on coal combustion and then Na 2 O. − When the blending ratio of SS is 25 wt %, the K content in the particle is low, and thus the catalytic effect is not obvious. When the blending ratio of SS increases to 50 wt %, the K content in the particle is multiplied, and therefore, the catalytic capability is significantly enhanced.…”

Section: Results and Discussionmentioning

confidence: 98%

Study of Sewage Sludge/Coal Co-Combustion by Thermogravimetric Analysis and Single Particle Co-Combustion Method

Lei

Zhang

et al. 2018

Energy Fuels

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In this paper, a single particle (400–500 μm) co-combustion method was proposed to study the co-combustion characteristics of sewage sludge (SS) and bituminous coal (BC) in air and oxy-fuel conditions. In addition, the thermogravimetric analysis experiments were also carried out for comparison. The results from single particle combustion experiments indicate that SS and BC and their blends all exhibit a two-stage combustion process. With the blending ratio of SS increasing from 0–50 wt %, the volatiles flame of blended fuel particle becomes shorter and smaller, while the average temperature of volatiles flame increases from 1332.4 to 1399.2 °C, which suggests a synergistic effect exists. Owing to the extremely low fixed carbon content of SS, the average temperature of char combustion of the blended fuel particles decreases from 1472.3 to 1281.3 °C. The ignition delay time and volatiles burnout time of the blended fuel particles obviously decrease with the addition of SS. Replacing N2 by CO2 extends the ignition delay time and volatiles burnout time, and decreases the brightness, size, and average temperature of volatiles flame (by more than 140 °C), while its influence on the temperature of char combustion is less obvious. Increasing the O2 mole fraction in CO2 from 21% to 40% shortens the ignition delay time and volatiles burnout time, while it increases the combustion temperatures of volatiles (from 1258.7 to 1501.0 °C) and chars (from 1245.1 to 1545.9 °C).

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Section: Results and Discussionmentioning

confidence: 98%

Study of Sewage Sludge/Coal Co-Combustion by Thermogravimetric Analysis and Single Particle Co-Combustion Method

Lei

Zhang

et al. 2018

Energy Fuels

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“…The water evaporation was estimated according to [31]. Processes of the carbon oxidation were simulated using the Arrhenius law with previously determined activation energies and pre-exponentials [10]. The moment of heterogeneous ignition of fuel was defined as a state when the fuel surface temperature becomes higher than the environmental one and the ∂T/∂t in the subsurface layers has a jump for more than 30%.…”

Section: Methodsmentioning

confidence: 99%

“…The second class of widespread combustible waste are waste petrochemicals (used lubricants, oil based sediments and sludges, etc.). These types of waste mostly have a much better reactivity and calorific values than coal enrichment waste [7,10]. However, both the rheological and thermal properties of sludges are much worst than for classical oil-based fuels.…”

Section: Introductionmentioning

confidence: 99%

“…An application of the compositions based on coals with addition of the certain amounts of water and petrochemicals (CWSP) allows making the waste-derived fuel mixture with high enough combustion temperature and relatively fast ignition [10]. Different types of coals in the deposits are conjugated with production of the sludges and filter-cakes with high enough differences of chemical content, thermal and rheological properties.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the Addition of Petrochemicals onto the Atomization and Ignition of the Coal-Water Slurry Prepared from the Wastes

2020

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The composite quasi-liquid fuels made of different industrial waste become more and more attractive for scientists during last years. Coal-water slurry is one of the popular types of such compositions. Addition of the waste petrochemicals into the slurry allows decrease of the ignition delays of such composite for up to 27%. However, it has a non-trivial effect onto the atomization dynamics of the slurry making the size and velocity distributions of the aerosol more stable during propagation of the aerosol cloud. This, in turn, leads to more predictable ignition and combustion of the aerosol.

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“…During the combustion of coal particle, its mass and diameter decrease, the particle density remaining constant. A complete description of the physico-mathematical model of the processes of ignition and combustion of coal-water fuel is given in [14].…”

Section: Physico-mathematical Model Of Processes Of Ignition and Combustion Of Coal-water Fuel In Vortex Flowmentioning

confidence: 99%

Analysis of Combustion of Coal-Water Fuel in Low-Power Hot-Water Boiler via Numerical Modeling and Experiments

Алексеенко

Кузнецов

Maltsev

et al. 2019

J. Engin. Thermophys.

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The paper presents an experimental and computational study of various regimes of firing coal-water fuel in a low-power hot-water boiler that enable both dry and liquid slag removal. The experimental studies were carried out on a pilot industrial boiler adapted for firing coal-water fuel. The fuel was prepared using flotation products of beneficiation of K grade hard coal. The experiments were accompanied by numerical modeling of combustion processes. The mathematical model includes description of the carrier phase motion (based on the RANS approach with the twoparameter Menter SST k-ω turbulence model), radiation transfer (based on the P1 approximation of the spherical harmonics method for a two-phase two-temperature gray medium), particle motion (based on the Lagrange approach), and gas phase combustion (based on a combination of the kinetic model of combustion of gas components with the vortex break model). The physico-mathematical model was tested on the problem of combustion of coal-water fuel (CWF). One of the goals of the work was verification of a complex mathematical model. A comparative analysis of the results of the numerical modeling and experimental data showed that the model reliably described the process of burning in a combustion chamber. An advanced design of hot-water boiler enabling regimes of both dry and liquid slag removal was investigated. The chamber was shown to provide the necessary conditions for firing CWF in terms of reliability and economy.

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Computational modeling of the combustion of coal water slurries containing petrochemicals

Cited by 17 publications

References 30 publications

Study of Sewage Sludge/Coal Co-Combustion by Thermogravimetric Analysis and Single Particle Co-Combustion Method

Study of Sewage Sludge/Coal Co-Combustion by Thermogravimetric Analysis and Single Particle Co-Combustion Method

Effect of the Addition of Petrochemicals onto the Atomization and Ignition of the Coal-Water Slurry Prepared from the Wastes

Analysis of Combustion of Coal-Water Fuel in Low-Power Hot-Water Boiler via Numerical Modeling and Experiments

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