Experimental study on cement clinker co-generation in pulverized coal combustion boilers of power plants

Abstract

The idea to co-generate cement clinker in pulverized coal combustion (PCC) boilers of power plants is introduced and discussed. An experimental study and theoretical analysis showed this idea to be feasible and promising. By adding quick lime as well as other mineralizers to the coal and grinding the mixture before combustion, sulfoaluminate cement clinker with a high content of silicate (SCCHS) could be generated. The main mineral phases in SCCHS are 2CaO · SiO2 (dicalcium-silicate), 3CaO · 3Al2O3 ·CaSO4 (calcium-sulfoaluminate) and 2CaO · Al2 O3 ·SiO2(gehlenite). Performance tests showed that the SCCHS met the requirements for utilization in common construction. Based on this idea, zero solid waste generation from PCC would be realized. Furthermore, thermal power production and cement production could be combined, and this would have a significant effect on both environmental protection and natural resource saving.