Work

Dynamic Migration Characteristics of Potassium During Agricultural Waste Combustion and the Mechanism of Combined Chlorine–Sulfur Action

Year: 2025

Type: article

Abstract: Alkali metals in fuel seriously affect the normal operation of generator sets. Using agricultural waste (AW) from a corn field as raw material, the dynamic change of alkali metal K migration and transformation and the effect of competition between chlorine and sulfur on the behavior of AW were studied systematically. The results showed that transformation between different forms of K, especially water-soluble K, occurred. At low temperatures, K remained in the ash in the form of inorganic salt, and high temperature precipitated K and formed insoluble alkali metal compounds. Via FactSage thermodynamic equilibrium calculations, it was confirmed that KCl reacted with SiO2 to form a K2O·nSiO2 molten mixture in combustion. K initially existed in the form of KCl (s) and K2SO4 (s), high temperature promoted its transformation and decomposition, and it was eventually released as KCl (g). During combustion, Cl was more volatile than K, while S reduced the release of K and Cl through sulfation reaction to reduce the sediment viscosity.

Source: Molecules

DOI: 10.3390/molecules30122495

Authors: Jian Li, Yunlong Zhou, Guochao Zhao, Qixin Yuan

Institutions: Northeast Electric Power University, Taiyuan University of Technology

Language: English

Topic: Thermochemical Biomass Conversion Processes

Subfield: Biomedical Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Responsible consumption and production

Open Access status: gold

Estimated APC paid: $3,258