Effect of refractory agent on ash fusibility temperatures of briquette

To solve the problem of the low ash fusion point of briquette, this paper reported that the ash fusibility temperatures can be elevated by changing ash ingredients through blending refractory agents in briquette ash, which will create favorable conditions for moving bed continuous gasification of briquette with oxygen-rich air. The effects of Al2O3, SiO2, kaolin, dry powder and bentonite on ash fusibility temperatures were studied, based upon the relationship between briquette ash components and ash fusibility. The results show that the increasing of ash fusibility temperatures by adding the same amount (11%, w) of refractory agents follows the sequence of SiO2, bentonite, dry powder, kaolin, Al2O3, with the softening temperatures being elevated by 37.2, 57.6, 60.4, 82.6 and 104.4 °. With the same ratio of SiO2/Al2O3 in briquette, adding the Al2O3 component is more effective than SiO2 for raising ash fusibility temperatures. In this paper, inexpensive kaolin and bentonite rich in Al2O3 are found to be better refractory agents, and the suitable adding quantities are 9% and 11%, respectively.