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

• Published in: Bioresource technology 2020-03, Vol.299, p.122515-122515, Article 122515
• Main Authors: Li, Fenghai, Wang, Xiaochuan, Zhao, Chaoyue, Li, Yang, Guo, Mingxi, Fan, Hongli, Guo, Qianqian, Fang, Yitian
• Format: Article
• Language: English
• Subjects: Additive; Coal; Coal Ash; Oxidizing atmosphere; Potassium; Potassium retention ratio; Silicates; Temperature; Variation mechanism; Wheat straw ashes
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2019.122515

[Display omitted] •Potassium retention ratio (PRR) variations of wheat stalk (WS) ashes were investigated.•Influences of three additives (KL, JFA, ADP) on WS PRR were discussed.•The formations of K-Al/Fe silicates with KL or JFA prompted an increase in the WS mixture PRR.•ADP addition led to K-Ca/Mg phosphate generations and caused their PRR increase. 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 (