Abstract: A method for treating catalysts, in particular, for the cleaning and/or regeneration of a catalyst, whereby the catalyst comprises parallel channels. The catalyst is taken out of service for treatment and flushed with a cleaning and/or regeneration fluid in-situ in the assembled state. The cleaning and/or regeneration fluid is introduced under pressure to that end of a bundle of adjacent channels away from the pressurized end of the catalyst. The channels of the bundle are flushed against gravity and the cleaning and/or regeneration fluid escapes from the other end of the channels thereupon enters the free ends of other adjacent channels and flows through the same under the effect of gravity.

Abstract: A coal-fired power station is provided and has a boiler that is heatable by dry firing, a catalytic converter for reducing an NOx level, a flue gas channel that adjoins the boiler and leads to the catalytic converter, and a coarse ash separator disposed upstream of the catalytic converter in a section of the flue gas channel, which includes a sieve that extends essentially over an entire cross-sectional area thereof. The sieve is adapted to be deflected out of a position of rest by a flue gas stream and against the effect of a restoring force, and/or the sieve forms folds that are directed in an upstream direction relative to a flue gas stream and extend essentially parallel to one another.