Post-harvest processing methods for reduction of silica and alkali metals in wheat straw

Author: Thompson David   Shaw Peter   Lacey Jeffrey  

Publisher: Humana Press, Inc

ISSN: 0273-2289

Source: Applied Biochemistry and Biotechnology, Vol.105, Iss.1-3, 2003-03, pp. : 205-218

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

Abstract

Silica and alkali metals in wheat straw limit its use for bioenergy and gasification. Slag deposits occur via the eutectic melting of SiO2 with K2O, trapping chlorides at surfaces and causing corrosion. A minimum melting point of 950°C is desirable, corresponding to an SiO2:K2O weight ratio of about 3:1. Mild chemical treatments were used to reduce Si, K, and Cl, while varying temperature, concentration, % solids, and time. Dilute acid was more effective at removing K and Cl, while dilute alkali was more effective for Si. Reduction of minerals in this manner may prove economical for increasing utilization of the straw for combustion or gasification.

Related content