Heat exchange – Regenerator – Heat collector
Patent
1999-06-18
2000-11-14
Lazarus, Ira S.
Heat exchange
Regenerator
Heat collector
165 8, 165 6, 165119, 122 1A, F28D 702
Patent
active
061455822
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a heat accumulator block for regenerative heat exchangers with a plurality of heat exchanger plates which, for formation of flow channels, substantially extend parallel to one another.
Heat accumulator blocks of this kind are, in general, pie-shaped and together form a rotor which for one revolution passes through two zones. In the first zone, it is subjected to a hot medium which releases heat to the heat exchanger plates. In the second zone a cold medium flows therethrough to which the stored heat is released. The heat exchanger plates are comprised, in general, of steel and, for increasing their corrosion resistance, are lined with enamel.
Regenerative heat exchangers serve preferably to transfer heat from a hot gas flow to a cold gas flow. An important field is flue gas scrubbing, for example, in power plants and incinerators, whereby the flue gas is scrubbed in a flue gas desulfurization device. Before entering it, it is cooled whereby its heat is transferred onto the regenerative heat exchanger. Subsequently, reheating takes place by using the heat stored within the heat exchanger.
When cooling, the temperature, in general falls below the dew point of the condensible materials contained in the flue gas.
They will precipitate on the heat exchanger plates at the heat accumulator blocks and form deposits. Furthermore, the cold gas coming from the flue gas desulfurization device is, to a certain extent, loaded with liquid droplets and solid particles which will also deposit on the plates and which will worsen the deposit effect.
The channels in the heat accumulator blocks thus will become clogged to an increasing extent and thus require regular and rather frequent cleaning. This is done by exposure to a stream of air, water, or steam. For each cleaning process, a certain amount of freshly formed deposits will remain adhered to the plates so that the clogging of the channels is only delayed by the cleaning processes. As soon as the flow channels can no longer be reached by the cleaning processes, an exchange of the heat accumulator blocks must be performed.
It is an object of the invention to extend the service life of heat accumulator blocks.
SUMMARY OF THE INVENTION
As a solution to this object, the aforementioned heat accumulator block is characterized in that: side exposed to the cold medium, substantially parallel to the heat exchanger plates, protective plates and connect them to one another by fastening means, and plates where the cold medium enters.
The invention is based on the discovery that the deposits are primarily formed at the side of the heat accumulator blocks exposed to the cold medium whereby they extend substantially only to a relative short length into the flow channels. Only in this area the temperature of the hot medium falls below the dew point. With regard to the cold medium, this is the entry area with the highest degree of soiling. Here the inventive dirt collector is arranged. Its protective plates have substantially no contribution with regards to heat storage and heat transfer. It was found that the temperature difference at the protective plates is in the magnitude of .+-.1K. The protective plates thus only provide depositing surfaces.
Surprisingly, this extremely simple measure, i.e., to eliminate spacers within the entry area of the protective plates, is sufficient to delay the formation of deposits greatly so that the time period between the still required cleaning processes is multiplied. Accordingly, the time period between the also still required exchanges is also multiplied whereby this, however, in most cases only refers to the dirt collector.
An additional advantageous effect results in that the edges of the protective plates that are not supported relative to one another thus provide a certain degree of freedom of movement. They therefore can experience vibration, especially when subjected to the cleaning medium, so that chipping of the deposits is greatly enhanced.
Finally, the cleaning medium impinges with
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Bolle Bernd
Hagemann Franz-Josef
Hewing Bernd
Stufchen Lothar
2H Kunststoff GmbH
Lazarus Ira S.
McKinnon Terrell
Steag AG
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