PCT No. PCT/EP85/00058 Sec. 371 Date Aug. 16, 1985 Sec. 102(e) Date Aug. 16, 1985 PCT Filed Feb. 21, 1985 PCT Pub. No. WO85/03768 PCT Pub. Date Aug. 29, 1985.Apparatus for cleaning the heat-exchanging surfaces of the storage elements of rotary regenerative heat exchangers. The apparatus has a row of nozzles oriented substantially at a tangent and in a radially displaceable manner before the end face of the storage element (1) in the interior of the heat exchanger, which cause the cleaning material, delivered to them from a source of cleaning material, to emerge in an aimed manner onto the storage element (1). The nozzles are provided on at least two spaced-apart nozzle heads (19; 17) disposed a tube (11; 13) extending substantially radially over one half of the end face of the storage element (1), the tube being guided into the interior of the heat exchanger in a sealed manner and being movable by a drive means radially back and forth above the storage element (1). Via movable connecting means, the tube (11; 13) is connected to at least one external, stationary material line delivering the cleaning material. The radially inner nozzle head (19), being adapted to the lesser circumferential speed of the heat exchanger in this vicinity, has a lesser number of nozzles than the next nozzle head (17) in radially outward sequence.
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