Currently, cellular SCR denitration catalyst is the core of SCR technology, which has the properties like expensive, short life, containing toxic precious metals, its frequent replacement not only cause the operational costs of coal-fired power plants increasing; but also serious threat the environment, as a large number of abandoned or inactivated denitration catalyst unable to be properly handled. Denitration catalyst regeneration can not only alleviate the secondary pollution which it brings; also can greatly reduce the costs of denitration project construction and operation, and thus has a very important significance of research.

 

During the operation, the catalyst wear out, poisoned such phenomena are inevitably occurred, thus to result in partial or total inactivation. Today, the widely used of denitration catalyst is taking vanadium pentoxide and tungsten trioxide as the main active substances, wherein the vanadium pentoxide has a highly toxic, tungsten is a rare precious metals, therefore, their recovery is very necessary.

 

The process for generating waste tungsten trioxide SCR denitration catalyst is as following: soot blowing high-pressure air, high-pressure water washing, ultrasonic cleaning, acidification washing, active implantation, drying and calcination. Among them, the higher the degree of soot blowing, the shorter time of cleaning or chemical solution treatment is, the smaller the amount of waste water, and thus to help control the costs of catalyst regeneration; high-pressure water washing helps to improve the denitration efficiency; the specific surface area of catalyst after ultrasonic cleaning close to the new catalyst; activity implantation, a critical step to further improve the activity of the catalyst, which is necessary to catalyst regeneration efficiency; drying process is to restore the mechanical activity of the catalyst, and the calcination is the only way to decompose the active ingredient precursors, as well as the one very critical process in the regeneration of tungsten trioxide SCR denitration catalyst.