Evaluation and optimization of preparation for semi-coke briquette with alkali-heat treated wheat straw binder

Yuan, Maobo; Wang, Chang’An; Zhao, Lin; Zhu, Zhengrong; Wang, Pengqian; Wang, Chaowei; Che, Defu

doi:10.1080/19392699.2020.1841176

Cited by 2 publications

(1 citation statement)

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“…Using biodiesel as CNG pilot fuel can reduce NOx emission and smoke [28]. Existing literature [29] has discussed the combustion mechanism of anthracite coal mixed with different biomass contents, but the effects of molding pressure and binder, the key technical parameters affecting briquette's properties [13,30,31], were not taken into consideration. Clay plays a catalyst role in reducing PM, cracking down the coal char into carbon and hydrogen and decreasing the PM precursors [13].…”

Section: Introductionmentioning

confidence: 99%

Influence of Molding Technology on Thermal Efficiencies and Pollutant Emissions from Household Solid Fuel Combustion during Cooking Activities in Chinese Rural Areas

Zhang

2021

Symmetry

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Resident combustion of solid fuel has been widely acknowledged as a high potential for pollutant reduction. However, there is a marked asymmetry between more pollutant emission and less burned volatiles of biomass and coal in the combustion process. To study the solid fuel optimum combustion form in a household stove, both the pollution reduction and energy efficient utilization of crop straws and coals were investigated. Taking the molding pressure and clay addition ratio as variable process conditions, the research of bio-coal briquette (made from the mixture of anthracite and biomass) was implemented in the range of 15~35 MP and 5~15%, respectively. Biomass and coal work complementarily for each other’s combustion property development. In particular, the pyrolysis gas produced by biomass low-temperature devolatilization is featured with low ignition point and is distributed in the bio-coal briquette. Its own combustion provides energy for anthracite particle combustion. Consequently, a positive effect was identified when bio-coal briquettes were used as residential fuel, and further improvement manifested in reducing more than 90% of particle matter (PM) and achieving about twice the thermal efficiencies (TEs) compared with the mass-weighted average values of coal briquettes and biomass briquettes. 88.8 ± 11.8%, 136.7 ± 13.7% and 81.4 ± 17.7% more TEs were provided by wheat straw–coal briquettes, rice straw–coal briquettes and maize straw–coal briquettes. 93.3 ± 3.1% (wheat straw–coal), 97.6 ± 0.2% (rice straw–coal) and 90.4 ± 2.2% (maize straw–coal) in terms of PM2.5 emission factors (EFs) was reduced. For bio-coal briquette, a 25 MPa and 10% addition were determined as the optimum molding pressure and clay addition ratio. Bio-coal briquettes with higher TEs and lower PM EFs will bring about substantial benefits for air quality promotion, human health and energy saving.

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