Heat exchange – Regenerator – Cleaning
Patent
1985-08-16
1987-03-17
Davis, Jr., Albert W.
Heat exchange
Regenerator
Cleaning
165 95, F28G 900
Patent
active
046499873
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for cleaning the heat-exchanging surfaces of the storage elements of rotary regenerative heat exchangers. The apparatus has at least one row of nozzles disposed beside one another in a substantially tangential orientation and in a radially displaceable manner before the end face of the storage element in the interior of the heat exchanger. The nozzles direct the cleaning material, furnished to them from a source of cleaning material, in an aimed manner onto the storage element.
In order to remove the firmly adhering coating that forms on the heat-exchanging surfaces of storage elements in regenerative heat exchangers during operation and to clean heavily soiled and encrusted heating surfaces, and even conduits in the storage elements that have become completely closed due to soiling, while they are in their installed condition in the storage element carrier but not during operation--that is, during stopped or down times--an apparatus is known in which high-pressure nozzles are disposed in a row, parallel to the plane of the heat-exchanging surfaces, and these nozzles having aimed cylindrical or flat nozzle streams are displaced relative to the plane of the substantially tangentially oriented exchanging surfaces (German Patent DE-PS No. 25 14 173). The high-pressure cleaning nozzles produce sharply defined cleaning streams which strike their target at a point; overall, these streams effect an impacting, beating stress on the heating surfaces, causing firmly adhering, poorly water-soluble encrustations and coatings to be forcibly removed and comminuted. In order to reliably remove the solid contaminants, which are partly insoluble in water, that are loosened or comminuted by the high-pressure nozzles, low-pressure flushing nozzles designed for a relatively high liquid throughput were connected following the high-pressure nozzles and were preferably likewise disposed in a plane parallel to the high-pressure nozzles. The nozzles here are disposed on a carriage, which is moved radially above the end face of the storage elements during the cleaning operation. However, the intensive cleaning process necessitates taking the heat exchangers out of operation during the cleaning.
In a further development of the above known apparatus, it has also already been proposed that injector nozzles for a gas at low or medium pressure, or for a gaseous or vaporous cleaning material, be followed in the direction of the emerging nozzle stream by injector tubes in such a way that these tubes aspirate the enveloping gaseous heat-exchanging medium into the interior of the tube and deliver aimed streams, mixed with the cleaning material, to the through conduits between the heat-exchanging surfaces at a speed profile which is equalized over the injector cross section (German Patent DE-PS No. 26 15 433). The injecting medium here is preferably superheated steam, at a pressure of at least 4 atmospheres above atmospheric pressure and at a temperature of approximately 300.degree. C. In a further development of this embodiment, the injector nozzles were also already followed by a row of high-pressure nozzles, or else the high-pressure nozzles were disposed inside the injector tubes in the vicinity of the outlet of the tubes. Depending on the type of soiling and on the thickness of the coating, which such an apparatus it is possible to perform the loosening and injection operation, on the one hand, for regular daily cleaning to remove light soil, and the high-pressure cleaning operation, on the other, either alone or combined with the injector nozzles, for cleaning at longer intervals to remove heavy soil. When the high-pressure and injector nozzles are used simultaneously, the streams of water produced by the high-pressure nozzles force the coating off the heating surfaces and comminute it, while the gaseous or vaporous cleaning material mixture flushes or blows out the loosened, comminuted coating. The apparatus offers the advantage of both cleaning during operation and flushing of the heating surface
REFERENCES:
patent: 3144900 (1964-08-01), Stockman
patent: 4025362 (1977-05-01), Frauenfeld
patent: 4141754 (1979-02-01), Frauenfeld
Frauenfeld Martin
Goldschmidt Georg
Huber Horst
Mock Karlheinz
Davis Jr. Albert W.
SRM Svenska Rotor Maskiner Aktiebolag
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