For the imperfections and urgent problems to be solved in design,fabrication,installation and operation of fluidized bed boilers in recent years,this article offer the technical upodating and operational adjustment for,fluidized bed,so that the environmental quality can be improved,the service life of boilers can be extended and the economic operation of boilers can then be achieved.

The harm done to a boiler by slagging is being elucidated and the reason of its formation analyzed from the poin of view of coal category,operational practice etc;accompanied by an explanation of how slagging can be mitigated by starting work with combustion optimization and operational adjustments.

Clinical Analysis on Self-adjustment of the Anterior Mandibular Teeth after Extraction of the First Mandibular Premolar;