... calorific capacity is over 22000KJ/Kg (bituminous coal, half bituminous coal, anthracite, inferior coal). Hollow kiln can be used to burn inferior ... .6.Reasonable structure: Every duct of Five-duct pulverized coal combustor adapts section structure, and it facilitates the maintenance ... , and this can prolong the service life of the coal injection pipe.7.Environment friendly: achieve enrichment of more ...