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High strength clean briquettes production by using recycling coal fines is of great realistic significance in saving coal resources and protecting the environment. Blends consisting of a long‐flame coal fines and coal slime (CS) and polyvinyl alcohol (PVA) as binders were used in the preparation of briquettes. To produce a qualified clean briquette with enough briquette strength, the effects of the binder content, briquetting pressure, and moisture content were systemically investigated. The results indicated that the briquettes prepared by using blended binder with 20 wt.% of CS and 1 wt.% of PVA showed better compressive strength (10.2 MPa) and drop strength (98.3%). CS with particle size less than 0.2 mm could fill in the gap between the coarse coal particles uniformly, thus reinforcing the embedded state and leading to a higher briquette strength. Moreover, the strength of the briquettes was also affected by the briquetting pressure and moisture content. At briquetting pressure of 60 kN and optimum moisture content of 14%, the highest briquette strength was achieved. The hydroxyl content of the briquettes by adding CS and PVA increased significantly. In this condition, a highly viscous network colloid was formed when the PVA and water were mixed together. When the briquettes were dried, the colloid could produce a dendritic structure, which was mechanically embedded between adjacent coal particles.

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High strength clean briquettes production from long‐flame coal fines by using polyvinyl alcohol and coal slime as binders

Liu

Chang

Yang

et al. 2020

Asia-Pacific J Chem Eng

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Measurement of Indoor Sulfur Dioxide Emission from Coal–Biomass Briquettes

Isobe

Yamada

Wang

et al. 2005

Water Air Soil Pollut

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The coal-biomass briquette is an alternative fuel that replaces low-grade coal. It is expected that the use of coal-biomass briquettes will effectively reduce the indoor concentration of sulfur dioxide (SO 2 ) emitted during raw coal combustion. In this study, indoor concentrations of SO 2 emitted from combustion of either coal-biomass briquettes or low-grade coal in households in Nanchuan, which is in the rural area of Chongqing City, China, were measured. The acidic gases were collected using passive samplers, and the samplers were taken to the laboratory for extraction and measurement. The SO 2 concentrations resulting from the use of coal-biomass briquettes were clearly reduced compared with those resulting from the use of low-grade coal. The concentrations of SO 2 to which the inhabitants (housewives) of the houses were exposed were also measured, and were found to be less with coal-biomass briquettes. Although with coal-biomass briquettes exposure concentrations still exceeded the World Health Organization guideline for SO 2 (125 µg m −3 ), indoor air pollution and adverse effects on human health caused by SO 2 could be decreased by substituting coal-biomass briquettes for low-grade coal as a domestic fuel.

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Evaluation of rational sulphur dioxide abatement in China

Lei¹,

Lu²,

Lu³

et al. 2008

IJEP

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Cited by 3 publications

References 2 publications

High strength clean briquettes production from long‐flame coal fines by using polyvinyl alcohol and coal slime as binders

High strength clean briquettes production from long‐flame coal fines by using polyvinyl alcohol and coal slime as binders

Measurement of Indoor Sulfur Dioxide Emission from Coal–Biomass Briquettes

Evaluation of rational sulphur dioxide abatement in China

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