Release characteristics of potassium and chlorine for torrefied wheat straw during a combined pyrolysis-combustion system. (September 2020)

• Record Type: Journal Article
• Authors: Zhang, Shuping; Min, Ganggang; Wang, Junyi; Zhu, Shuguang; Zhang, Houlei; Liu, Xinzhi
• Is Part Of: Bioresource technology. Volume 312(2020)
• Publication Date: 2020-09
• Subjects: Torrefaction -- Pyrolysis -- Straw -- Potassium -- Chlorine; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2020.123591
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Release rate of Cl was significantly higher than K during torrefaction process. Pyrolysis temperature of 700 ℃ for pyrolysis-combustion system was suitable. Release characteristics of K/Cl for torrefied samples at 400–800 ℃ were observed. Abstract: The objective is to investigate the release characteristics of potassium (K) and chlorine (Cl) for torrefied wheat straw during a combined pyrolysis-combustion system. Powder and flake wheat straw samples were torrefied at different temperature of 200–300 ℃. The basic characteristics of torrefied samples and the K and Cl release rates of torrefied samples and their char samples derived from pyrolysis at 400–800 ℃ were analyzed and characterized. The results indicated that release rate of Cl was significantly higher than that of K under the same torrefaction conditions. In order to keep most of K and Cl remaining in biochar as well as the volatiles were completely released, the pyrolysis temperature of 700 ℃ for pyrolysis-combustion system was suitable. The total release rate of K and Cl at the pyrolysis temperature of 700 ℃ both exhibited a change trend of decreasing first and then increasing with the increase of torrefaction severity.