Effect of a Small Amount of Aluminum Powder on the Combustion of the Waste-Derived Coal–Water Slurry

Valiullin, Timur; Egorov, Roman I.; Стрижак, П. А.

doi:10.1021/acs.energyfuels.6b02540

Cited by 3 publications

(5 citation statements)

References 7 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%

“…This can explain why the average flame temperature turned out to be higher when 50% SS is added into BC. In some cases, extra metal and metal oxide additives are needed to improve the combustion performance of low-grade fuels. ,, …”

Section: Results and Discussionmentioning

confidence: 99%

“…In some cases, extra metal and metal oxide additives are needed to improve the combustion performance of low-grade fuels. 35,37,38 3.2.2. Ignition Delay Time and Volatiles Burnout Time.…”

Section: Energy and Fuelsmentioning

confidence: 99%

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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%

Section: Results and Discussionmentioning

confidence: 99%

See 1 more Smart Citation

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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“…Figure shows the ignition and combustion device of nanofluid fuels, which is similar to the device used in previous studies. − The device consists of a sample transfer system, a reaction system, a temperature measurement system, and a data acquisition system. There are two thermocouples.…”

Section: Methodsmentioning

confidence: 99%

Ignition and Combustion Characteristics of Heptane-Based Nanofluid Fuel Droplets

et al. 2019

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Nanofluid fuels are promising fuels in the fields of spaceflight and aviation. Their stability is a critical constraint for potential applications. Oleic acid can enhance the stability of nanofluid fuels, but it influences the ignition and combustion performance of nanofluid fuels. In this study, the effects of various concentrations of oleic acid and nanoparticles (NPs) on the ignition and combustion performance of the heptane-based nanofluid droplets were studied using a high-temperature tubular resistance furnace system at 600–700 °C. The ignition delay times, ignition temperatures, and combustion processes of all samples were measured. The results show that with the increase of temperature, the ignition delay times and ignition temperatures of the pure heptane, heptane with addition of oleic acid, and heptane-based nanofluid droplets decrease. The addition of oleic acid into the heptane, its ignition delay time and ignition temperature significantly increase with the increase in oleic acid concentration, which are greatly increased by 60 and 40%, respectively, for the heptane droplet with 2% oleic acid compared with the heptane droplet. Oleic acid makes the heptane droplet to undergo microexplosion, surfactant combustion, and secondary extinguishment. With the increase in temperature and concentration of oleic acid, the microexplosion and the number of generated bubbles are more obvious. Al NPs have little influence on the ignition delay time of the heptane droplet with oleic acid at 600 and 650 °C, while the enhancement of nanoparticles is significant at 700 °C. In addition, Al NPs can decrease the ignition temperature of heptane-based nanofluid droplets and the decreased percent reaches 17%, but the promoting effect is weaker than the inhibition effect of oleic acid. With the increase in concentration of Al NPs, microexplosion of the heptane-based nanofluid droplet will be enhanced.

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“…A promising solution to the basic environmental problem of coal thermal power engineering is replacing solid fossil fuel with composite fuels, − the main components of which are finely divided coal and water. Unlike coal, when burning such fuel, several times less sulfur and nitrogen oxides are emitted, as well as fly ash. , Coal–water slurries containing petrochemicals (CWSPs) are of lower cost and higher fire and explosion safety , compared to those of widespread solid fossil fuels.…”

Section: Introductionmentioning

confidence: 99%

A Mathematical Model for Processes in Coal–Water Slurries Containing Petrochemicals under Heating

2018

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One of the promising directions for improving the environmental, technical, and economic efficiency of coal-fired thermal power plants is the use of the multicomponent fuels based on coal and combustible liquids. Such fuels, as a rule, are called coal–water slurries containing petrochemicals (CWSPs). The typical wastes of coal enrichment, low-grade coals, oil production, and oil refining wastes as well as used flammable liquids, for example oils, can be included in the fuel composition. To date, mathematical models have not been developed for predicting the effective conditions for the ignition of promising CWSPs at minimum ambient temperatures and with short ignition delay times. This problem was solved in the present work. On the basis of the experimental results, three modes of physical and chemical transformations were established when heating single particles of the composite fuel. The first one is the intensive thermal decomposition of the coal component after evaporation of the liquid components of the fuel. Then goes the gasification of coal under the boiling conditions of the liquid components followed by the heterogeneous combustion of the solid residue. The third mode is the ignition of the gas mixture in the vicinity of the fuel particle and initiation of heterogeneous combustion of the solid residue. The temperature ranges of the environment were determined under which the detected modes of the physical and chemical transformations occur. The obtained experimental data became the basis for the development of a predictive mathematical model of the transformations that occur when heating a composite fuel with different characteristics of the components. It takes into account the interrelated physical and chemical processes: inert heating, evaporation, thermal decomposition, and exothermic reaction. The developed mathematical model and the results of the theoretical studies make it possible to establish the influence of the characteristics of the fuel components and the conditions of its heating on the three identified modes of physical and chemical transformations.

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Effect of a Small Amount of Aluminum Powder on the Combustion of the Waste-Derived Coal–Water Slurry

Cited by 3 publications

References 7 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

Ignition and Combustion Characteristics of Heptane-Based Nanofluid Fuel Droplets

A Mathematical Model for Processes in Coal–Water Slurries Containing Petrochemicals under Heating

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