Influence of phosphorus based additives on nitrogen and sulfur pollutants emissions during densified biochar combustion

Qian Wang, Qiankun Cao, Rui Wang, Peifu Wang, Yanhua Zhao, Shijie Li and Feifei Han

Energy, 2023, vol. 275, issue C

Abstract: Biomass is a carbon neutral fuel and can effectively replace fossil fuels. However, its large scale application is limited by disadvantages such as low calorific value, low energy density and high alkali content. Densification, pyrolysis and adding additives are available methods to upgrade biomass fuels. Nevertheless, emission rules of nitrogen and sulfur oxides in combustion of densified biochar need to be clarified. This paper focuses on the emission and transformation mechanisms of nitrogen and sulfur pollutants during pyrolysis and combustion of biomass with phosphorus based additives by means of thermodynamic calculation and experimental research. The addition of additives promoted the emissions of H2S, COS and NH3 during pyrolysis, so the treatment of H2S and COS needs to be considered particularly. During combustion of densified biochar at 1000 °C, increased pyrolysis temperature accelerated SO2 emissions, while it had no obvious influence on NO emissions. NH4H2PO4 accelerated organic sulfur release, NH4H2PO4 and Ca(H2PO4)2 slightly reduced the emission of NO. The maximum values of NO and SO2 release rates were about 2.81 and 1.55 g/kg, respectively, which were lower than those of most typical fuels. The upgraded densified biochars have benefits such as high calorific value, low melting point and low pollutant emission.

Keywords: Biomass; Pyrolysis; Combustion; Additive (search for similar items in EconPapers)
Date: 2023
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:275:y:2023:i:c:s0360544223008368

DOI: 10.1016/j.energy.2023.127442

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