Heat exchange – Intermediate fluent heat exchange material receiving and... – Plural intermediate fluent heat exchange materials
Patent
1983-03-21
1985-08-27
Davis, Jr., Albert W.
Heat exchange
Intermediate fluent heat exchange material receiving and...
Plural intermediate fluent heat exchange materials
165 78, 165133, 122DIG2, F28D 1500
Patent
active
045372470
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a heat pipe heat exchanger.
BACKGROUND TECHNIQUE
Heretofore, various types of heat exchangers utilizing heat pipes which transfer heat from a high temperature fluid to a low temperature fluid have been developed.
As a typical one thereof, a fixed-type heat pipe heat exchanger is known wherein a group of heat pipes are arranged in box form and the central part thereof is partitioned, a high temperature fluid being let to flow into one and a low temperature fluid into the other one, respectively, so that, by the specific properties of the heat pipes, the heat given from the high temperature fluid is transferred to the low temperature fluid through the sealed-in fluid in the heat pipes.
However, if this kind of fixed-type heat pipe heat exchanger is used to recover heat effectively from the combustion gases containing dust, sulfur oxide (SO.sub.x) and nitrogen oxide (NO.sub.x) at high concentration exhausted from large-sized boilers or industrial furnaces for steam-power plant, then, as shown in FIG. 1, these dust and the like adhere to the gaps of a number of fins 2 attached to the outside of heat pipes 1 on the high temperature side to blockade the passage for the high temperature gas, and, also, the surface temperature of the heat pipes on the high temperature fluid side drops below the acid dew point temperature of the exhaust gas, so that the sulfuric acid content in the exhaust gas condenses to adhere to the surface of the heat pipes, this having been the cause of corroding the heat pipes.
Accordingly, the present invention, being one accomplished in view of the above-mentioned circumstances, has for its object the providing of a fixed-type heat pipe heat exchanger which can be used to recover heat from the combustion gases containing dust, sulfur oxide (SO.sub.x) and the like at high concentration exhausted from a large-sized boiler or the like of a steam-power plant and utilize the heat effectively, and wherein the gas passages are not blocked up by dust and the like and yet the heat pipes are not corroded by the sulfuric acid content in the exhaust gas.
DISCLOSURE OF THE INVENTION
That is to say, the present invention lies in a heat pipe heat exchanger wherein a passage for low temperature fluid and a passage for high temperature fluid are formed respectively by a partition wall and a plurality of heat pipes of which those on at least the high temperature fluid passage side are bare pipes are arranged to extend over both passages, the heat pipes on the high temperature fluid passage side being inserted in finless outer pipes.
BRIEF EXPLANATION OF THE DRAWING
FIG. 1 is an explanation of the conventional general fixed-type heat pipe heat exchanger,
FIG. 2 shows an entire flow sheet of one embodiment of the heat pipe heat exchanger of the present invention, wherein the numeral 15 represents the heat pipe heat exchanger of the present invention, and
FIGS. 3 and 4 are diagrams of the embodiment of the heat pipe heat exchanger of the present invention.
BEST MODE FOR WORKING THE INVENTION
To expound the present invention in more detail, an explanation is given hereunder following the accompanying drawing.
FIGS. 2, 3 and 4 show one embodiment of the present invention, FIG. 2 being an example of arrangement of the heat pipe heat exchanger 15 of the present invention disposed before and after a wet-type desulfurizer 14 for boiler exhaust gas.
The combustion air for boiler 12 supplied by a forced-air blower 10 is first preheated in an air preheater 11 and then supplied to a boiler 12. The exhaust gas from the boiler 12 which uses sulfur-containing fuels such as coal or heavy oil is passed through the air preheater 11 and a dust collector 13 and is fed as a high temperature fluid for the heat pipe heat exchanger 15. The gas temperature at the high temperature fluid inlet duct which varies with operating conditions such as boiler load and the like and overall design requirements is usually from 130.degree. to 170.degree. C. or thereabouts, which is low
REFERENCES:
patent: 4079702 (1978-03-01), Furubawa et al.
Chikami Michio
Fukaya Yasuhiro
Okamoto Eiji
Davis Jr. Albert W.
Gadelius Kabushiki Kaisha
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