Briquette preparation with biomass binder

ABSTRACT

Residential coal combustion is regarded as a major contributor to severe haze pollution in China, and clean briquettes are supported as a way of reducing emissions. In this study, Shendong coal (SC) and a composite binder made from maize straw (MS) were used to prepare a briquette with higher combustion characteristics and lower pollution emissions by using a newly designed method. Thermochemistry and emission characteristics of samples were studied by using a thermogravimetric analyzer and a tube combustion experimental system, respectively. The results showed that for a 20% biomass mass fraction with <0.5 mm particle size, biomass treatment with alkali agents or the addition of a sulfur-fixing agent resulted in significantly reduced SO₂ emission; however, molding the sample increased total SO₂ emissions, particularly in the early stages. NO emission decreased markedly with biomass, alkali-treatment or the addition of a sulfur-fixing agent. However, NO emission increased when the biomass had a particle size of 0.5–2 mm and when the sample was molded.

KEYWORDS:

• Low-rank coal
• newly designed method
• biomass binder
• briquette coal
• pollutant emissions

Additional information

Funding

This research was supported by the National Natural Science Foundation of China (Grant No. 51574239, 51774285 and 51704291), and was sponsored by Qing Lan Project.