Heat exchanger

Abstract

Combustion gas channels through which combustion gas (A) flowing in from a combustion gas inlet (17) passes are formed in first and second heat exchanger bodies (23) and (19) so as to be directed toward a combustion gas outlet (21) respectively. Liquid fuel (B) in which methanol and water have been mixed is supplied into a gap (51) between a distribution plate (47) and an upper plate (49) through fuel supply holes (57). The liquid fuel (B) is distributed and supplied to the whole of the first heat exchanger body (23) through a large number of holes in the distribution plate (47). In the first and second heat exchanger bodies (23) and (19), fuel channels (23a) and (19a) through which the liquid fuel (B) passes are formed so as to be directed vertically and separated from the combustion gas channels by partition plates, respectively. The liquid fuel (B) passing through the fuel channels (23a) and (19a) carries out heat exchange with the combustion gas. Thus, the liquid fuel (B) is vaporized. Chamfers are formed in the lower surfaces of the large number of holes of the distribution plate (47) so that the liquid fuel (B) flowing down through the holes is collected in the chamfer portions, and falls down in the form of drops. Thus, flows of the liquid fuel flowing out from adjacent ones of the holes are prevented from joining each other.

Description

[0001] 1. Field of the Invention[0002] The present invention relates to a heat exchanger. In the heat exchanger, a high-temperature heating medium passes from above heating medium channels, and liquid fuel is supplied to fuel channels adjacent to the heating medium channels through partition walls respectively, so that the liquid fuel is vaporized by heat exchange with the high-temperature heating medium.[0003] 2. Description of the Related Art[0004] The related art of the present invention will be described with reference to FIGS. 23-27. However, please note that these figures are prepared based on internal information of Calsonic Kansei Corporation that the Inventors belong to. Accordingly, these figures do not always constitute prior art of the invention.[0005] For example, the fuel battery heat exchanger for a fuel battery is used to evaporate a liquid mixture of methanol (CH.sub.3OH) and water (H.sub.2O) and further superheat the evaporated mixture to a predetermined temperatur...

AI Technical Summary

Problems solved by technology

As a result, a large amount of the liquid fuel B falls down to a certain portion so that the liquid fuel B cannot be supplied uniformly to the whole area of the first heat exchanger body 5.

Thus, there is a problem that the heat exchanger cannot exert its function satisfactorily.

When the first heat exchanger 5 and the second heat exchanger 3 provided separately from each other are provided in the fuel battery so as to evaporate and superheat the mixed liquid of methanol and water to a predetermined temperature as described above, not only does the circuit of the fuel battery become complicated, but the number of parts of the fuel battery also increases.

Thus, the fuel battery as a whole increases in cost and in size.

In addition, because the first heat exchanger 5 and the second heat exchanger 3 are provided separately from each other for the purpose of circulating high-temperature gas through the first heat exchanger 5 and the second heat exchanger 3 separately, if the first heat exchanger 5 and the second heat exchanger 3 are bonded integrally without devising any special bonding method, it is difficult to keep the bonded state excellent for a long time.

If such secondary melting occurs, the yield of products deteriorates, of course, to thereby cause increase in cost.

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