Cleaning of deposit filters

#The invention relates to a new process for the cleaning of deposit filters having filter elements installed in a suspended manner and to a deposit filter suitable for this purpose.

#Deposit filters are used particularly for the treatment of relatively large streams of liquid, such as, for example, for cleaning the condensates of steam-generating plants.

#After a work cycle of a deposit filter has ended, it is important, each time, to clean off the deposit promoter, together with the filter cake formed during the work cycle, as completely and as uniformly as possible. As a result, on the one hand the filter capacity per work cycle can be kept high, and on the other hand, during the subsequent deposition, the new deposit promoter can be applied uniformly to the cleaned filter substrate.

#For a better understanding, the cleaning method according to the invention is further illustrated below by means of two typical examples, with an indication of the average time spans and the respective settings of the ventilating valve assembly 11, emptying valve assembly 12 and pressure-generating valve assembly 13. However, at all events, the duration of the individual steps should be matched to the geometry of the respective deposit filter and coordinated with one another in the most effective possible way. The time spans indicated can therefore give at most a rough guideline and are in no way to be understood in the sense of a restriction.

#Cleaning method with the generation of an underpressure in the filter chamber:

#______________________________________ Typical duration Valve assembly (sec) 11 12 13 ______________________________________ A) Initial position with closed closed closed air-bled filter vessel filled with liquid after the end of a work cycle B) Partially empty the 10 open open closed filter chamber C) Buildup an under- 2 closed open closed pressure in the filter chamber D) Flushing surge 1 closed open open E) Discharge 30 open open closed ______________________________________