Heat exchange – Regenerator – Cleaning
Patent
1986-12-29
1989-03-28
Davis, Jr., Albert W.
Heat exchange
Regenerator
Cleaning
134181, 134102, 134167R, F28G 900
Patent
active
048155233
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for cleaning rotary regenerative heat exchangers for the transfer of heat from a higher-temperature contaminated gas stream to a lower-temperature stream of clean gas. The device has nozzles disposed on a carriage, as well as a guide and a drive for the radial displacement of the carriage over the face(s) of the storage mass of the recirculating regenerative heat exchanger between an outer circumferential end position and an inner end position nearer to the hub, and flexible conduits for carrying the cleaning and/or rinsing media to the nozzles, and to a process for cleaning rotary regenerative heat exchangers.
In connection with rotary regenerative heat exchangers in boilers for the transfer of the exhaust heat to the fresh air being fed to the combustion device, the media, hot steam and compressed air, which are available in the generating plant, are often used as cleaning agents in cleaning apparatus, for the purpose of removing aqueous precipitates at the so-called cold end of these heat exchangers. As a rule, the cleaning is limited to this cold end, at which the cooled gases leave and the combustion air enters, after the temperature on this side of the heat transfer surfaces temporarily falls below the dewpoint and thus the formation of incrustations is favored. By cleaning at the exhaust end, the passage of the loosened incrustations through the fresh air line and its throttle valves into the burners of the boiler, which might impair their operation, is avoided.
In order to clean severely contaminated and encrusted heating surfaces, and in some cases completely incrustation-clogged passages in the storage mass of the heat exchanger while the latter is in the installed state, but after the air preheater has been taken out of operation, and to flush the loosened matter reliably and completely out of the storage mass, rows of nozzles for a high-pressure cleaning agent, and flushing nozzles connected to the cleaning nozzles but designed for a higher liquid throughput but lower pressure, have been provided on a nozzle carriage which is displaced within a sector on appropriate guiding means over the face of the storage mass of the heat exchanger relative to the planes of the heat-exchanging surfaces (DE-B 25 14 173). Furthermore, a system is known for the purpose of releasing loosely adherent, dusty coatings by deep-acting cleaning jets during the operation of the rotary regenerative heat exchanger and driving them out before it is possible for tightly adherent primary coatings and secondary coatings to build up thereon. For this purpose, injector nozzles for injecting a gaseous or vaporous cleaning agent under low to medium pressure are used, which are followed, in the direction of the emerging nozzle stream, by injector pipes such that they aspirate a portion of the gas stream flowing about these nozzles during operation into the tube and feed it, mixed with the cleaning agent, as directed jets at a velocity equalized across the injector cross section to the passages formed between the heat-exchanging surfaces of the storage mass (DE-B 26 15 433). Although the velocity at which the jets from the nozzles enter into the passages between the heat-transfer surfaces to be cleaned is reduced by this aspirating action, the mass flow is nevertheless increased in the same degree and a more intense and deeper releasing and blowing action is achieved.
The machinery used in industry, especially the automotive industry, includes paint and lacquer spraying apparatus. Proposals for the recovery of heat from the exhaust of this lacquer spraying equipment for the purpose of reheating their input air have not produced satisfactory results. The paint fog precipitators which have, on the basis of these proposals, been connected to the heat exchanging apparatus, have not been able, in spite of being improved to ever higher degrees of separation of recently as much as nearly 99.9%, to protect the heat exchangers to the necessary extent. Rotary regenerative heat exchangers used as heat transf
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patent: 4402104 (1983-09-01), Olesousky et al.
Dehli Frank
Lampl Fritz
Davis Jr. Albert W.
Kraftanlagen AG
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