Influence of additives on potassium retention behaviors during straw combustion: A mechanism study

Fenghai Li; Xiaochuan Wang; Chaoyue Zhao; Yang Li; Mingxi Guo; Hongli Fan; Qianqian Guo; Yitian Fang

doi:10.1016/j.biortech.2019.122515

Influence of additives on potassium retention behaviors during straw combustion: A mechanism study

Bioresour Technol. 2020 Mar:299:122515. doi: 10.1016/j.biortech.2019.122515. Epub 2019 Nov 29.

Authors

Fenghai Li¹, Xiaochuan Wang², Chaoyue Zhao³, Yang Li³, Mingxi Guo⁴, Hongli Fan⁴, Qianqian Guo⁴, Yitian Fang⁵

Affiliations

¹ School of Chemistry and Chemical Engineering, Heze University, Heze 274015, China; School of Power and Mechanical Engineering, Wuhan University, Wuhan, Hubei 430072, China; School of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, Henan 454003, China; State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China.
² School of Power and Mechanical Engineering, Wuhan University, Wuhan, Hubei 430072, China. Electronic address: xcw@whu.edu.cn.
³ School of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, Henan 454003, China.
⁴ School of Chemistry and Chemical Engineering, Heze University, Heze 274015, China.
⁵ State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China.

PMID: 31865152
DOI: 10.1016/j.biortech.2019.122515

Abstract

The potassium retention behaviors of wheat stalk and its modification mechanisms in an oxidizing atmosphere by three additives [kaolinite, fly ash from Jincheng coal fluidized-bed gasification (JFA), and ammonium dihydrogen phosphate (ADP)] were investigated. The potassium retention ratios (PRRs) increased with increasing additive mass ratio. The ADP was the optimal selection for wheat stalks combustion when the three additives at the same mass ratio because of its highest PRR and a slow decrease in PRR with an increase in temperature. With the increasing three additive mass ratios, the PRRs of their mixed ashes showed a similar trend [rapid increase (<12%) and then a slow increase (12%-15%)]. The mass ratios of three additives were all <1.0% and their mixed ash reached an appropriate PRR. For kaolinite or JFA, the formations of K-Al/Fe silicates prompted an increase in the PRR. For ADP, K-Ca/Mg phosphate generations increased the PRR.

Keywords: Additive; Oxidizing atmosphere; Potassium retention ratio; Variation mechanism; Wheat straw ashes.

MeSH terms

Coal Ash*
Coal*
Potassium
Silicates
Temperature

Substances

Coal
Coal Ash
Silicates
Potassium