Effect of concentration and relative position of wood and coal particles on the characteristics of the mixture ignition process

Кузнецов, Г. В.; Kostoreva, A.A.; Kostoreva, Zh.A.; Nigay, N.A.

doi:10.1016/j.fuel.2020.117843

Cited by 21 publications

(5 citation statements)

References 54 publications

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“…170 It was suggested that the ignition and flame behavior were largely dependent on the combustion parameters. Kuznetsov et al 172 placed special focus on the characteristics of the coal/OSW mixture ignition process and discussed the effect of OSW concentration and relative position. Figure 3 shows that OSW significantly accelerated the ignition of coal at 600−1000 °C, and this effect was manifested, to a smaller degree, by increasing the combustion temperature to >1000 °C.…”

Section: Co-combustion Fundamentals Of Osw and Coalmentioning

confidence: 99%

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Review on the Current Status of the Co-combustion Technology of Organic Solid Waste (OSW) and Coal in China

et al. 2020

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Increasing economy and population result in the rapid growth of solid waste in China, with more than 70% being carbonaceous components. The generated carbon-bearing solid waste is called as organic solid waste (OSW). In this Review, OSWs from both municipal and industrial sources are discussed and divided into municipal solid waste (MSW), organic sludge, polymer solid waste, and biomass-like solid waste, according to their variations in origins and characteristics in China. Agricultural waste (i.e., biomass) and large-scale industrial solid waste (e.g., coal waste) are not considered, because of their well-established fundamentals. Incineration is becoming the most common method of energy recovery for OSW in China, while it has to face the problems of relatively low thermal efficiency, high air pollutant emission, and the high risk of fly ash products. Compared with MSW incinerators, coal-fired power plants own efficient power generation systems and centralized air pollution control devices (APCDs). With the fact that mixed coals are widely used in existing power plants, it is of great significance to study and discuss the current status of cocombustion of OSW and coal in China. In this work, the physicochemical properties of OSW were first introduced, with a subsequent detailed summary on their co-combustion fundamentals, such as devolatilization, ignition, char reactivity, and combustion efficiency, and ash-related issues, including fouling/slagging, high-temperature corrosion, and leaching behavior of ash residue. Furthermore, pollutants emissions regarding conventional pollutant [CO, SO 2 , NO x , HCl, particulate matters (PM)], heavy metals, and hazardous organic pollutants such as polycyclic aromatic hydrocarbons (PAHs) and polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) were analyzed. Some pretreatment methods to reduce the risk of co-combustion were also discussed, including pelletization, drying, torrefaction, hydrothermal carbonization, and low-temperature pyrolysis. Lastly, discussions and perspectives on the future co-combustion technology of OSW with coal were presented. This work aimed to gain systematic knowledge on the co-combustion technology of OSW and coal, providing guidelines for further applications of OSW in power plants in China, as well as other countries in the world.

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Section: Co-combustion Fundamentals Of Osw and Coalmentioning

confidence: 99%

Section: Co-combustion Fundamentals Of Osw and Coalmentioning

confidence: 99%

Review on the Current Status of the Co-combustion Technology of Organic Solid Waste (OSW) and Coal in China

et al. 2020

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“…In the actual practice of burning coals or their mixtures with crushed biomass, the particles of these two fuels are located at some distance from each other in the furnace space. Therefore, it is logical to ask whether the experimental results [36] correspond to the actual conditions of the furnace space in terms of orientation and distances between individual fuel particles [37].…”

Section: Introductionmentioning

confidence: 99%

On the Effect of the Distances between Coal and Wood Particles during Their Joint Pyrolysis on Sulfur Oxides Formation

et al. 2021

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The simultaneous pyrolysis of coal with wood was experimentally found to allow reducing concentrations of sulfur-containing substances in gases released. The objective of experimental studies is comparison of the sulphate of calcium and aluminum in the ash of coal-wood mixtures after pyrolysis of the latter in a dense “packing” of aggregate particles of these two fuels and at a few millimeters distance between particles. The 3B-grade lignite, T-grade bituminous coal and pinewood sawmill waste were chosen as feedstocks for pyrolysis experiments because they are widespread in Russia as well as many other countries. The elemental composition of all raw materials and pyrolysis residues was determined. The inorganic composition of obtained pyrolysis product in the solid phase was characterized by X-ray analysis. The content of aluminum and calcium sulfate in residue in case of simultaneous processing of coal with wood was found to be higher, compared to the processing of coal only (within the random errors of the experiment), than those established for such mixtures under conditions of dense “packing” of large masses (up to 15 g).

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“…Some studies have indicated that the co-combustion of coal and biomass can increase the ignition point, enhance the ignition performance, and facilitate the complete combustion of coal in the furnace because of the low ignition temperature and abundant volatile content of biomass. 10 , 11 In addition, the emission concentration of sulfur oxide (SO x ), NO x , and other pollutant emissions is lower when coal is co-combusted with biomass. 12 , 13 Zhang et al found that the peanut shell reburned at 800 °C with a denitrification efficiency of 41.58% and desulfurization efficiency of 10.25%.…”

Section: Introductionmentioning

confidence: 99%

“…The desirability of new pollutant-treatment technologies based on clean energy sources has increased due to the serious environmental changes caused by the production of nonrenewable energy. Some studies have indicated that the co-combustion of coal and biomass can increase the ignition point, enhance the ignition performance, and facilitate the complete combustion of coal in the furnace because of the low ignition temperature and abundant volatile content of biomass. , In addition, the emission concentration of sulfur oxide (SO x ), NO x , and other pollutant emissions is lower when coal is co-combusted with biomass. , Zhang et al found that the peanut shell reburned at 800 °C with a denitrification efficiency of 41.58% and desulfurization efficiency of 10.25% . Liu et al found a synergistic effect of bituminous coal with corncob or hardwood.…”

Section: Introductionmentioning

confidence: 99%

Effect of Co-combustion of Multiple Additives with Coal on NO Removal

Wang

Liu

et al. 2021

ACS Omega

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Denitrification experiments of co-combustion of coal and additives were carried out in a horizontal tube furnace. The results showed that calcium acetate limited the production of NO 2 . The optimum calcination temperature of CTAB-Zr-TiO 2 was 673 K. The denitrification efficiency reached up to 72.27%, and desulfurization efficiency reached 83.03% when corncob, calcium acetate, and CTAB-Zr-TiO 2 were added. Corncob, calcium acetate, and CTAB-Zr-TiO 2 all promoted coal combustion. The specific surface area of CTAB-Zr-TiO 2 (55.50 m 2 /g) was the largest, which was more than 4.5 times that of pure TiO 2 (12.20 m 2 /g). The denitrification process in the co-combustion of coal with multiple additives included a homogeneous reaction and heterogeneous reaction. The homogeneous reaction was that NO and NO 2 were reduced to N 2 by reducing gases produced in combustion. The heterogeneous reaction involved the reduction of NO and NO 2 by coal char. The additives increased the specific surface area of the coal char and enhanced the activity of the heterogeneous reduction of NO and NO 2 . At the same time, the catalysis of alkali metal oxides in corncob and CTAB-Zr-TiO 2 promoted the heterogeneous reduction of NO and NO 2 by the coal char.

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Effect of concentration and relative position of wood and coal particles on the characteristics of the mixture ignition process

Cited by 21 publications

References 54 publications

Review on the Current Status of the Co-combustion Technology of Organic Solid Waste (OSW) and Coal in China

Review on the Current Status of the Co-combustion Technology of Organic Solid Waste (OSW) and Coal in China

On the Effect of the Distances between Coal and Wood Particles during Their Joint Pyrolysis on Sulfur Oxides Formation

Effect of Co-combustion of Multiple Additives with Coal on NO Removal

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