JPS6232395B2 - - Google Patents

Description

[Detailed description of the invention] The present invention is applicable to airflows such as air conditioners and condensers for binary cycle geothermal power generation plants, or airflows containing fine water droplets (mists) (mist airflows).
This invention relates to a condenser that cools and condenses other heat medium vapor, particularly to its header structure.

Conventional header structures of condensers include those without partition plates in the header 1 provided at both ends of a large number of heat transfer tubes 2, as shown in Fig. 1, and those without partition plates in the header 1, as shown in Fig. 2. Even if there is a plate 3, the way it is partitioned is the number of heat exchanger tubes 2 for each pass (N ₁ , N ₂ ...)
were to be the same. In both cases, the heat medium flows in as a vapor flow from the heat medium inlet 4 provided above the header 1, condenses while flowing through the heat transfer tubes 2, and flows into a liquid stream from the heat medium outlet 5 provided below the header 1. It flows out.

In a header structure in which there is no partition plate in the header as shown in FIG. 1, the steam flow rate in the heat transfer tube is slow and the heat transfer performance is poor. Further, even in a header structure in which the number of heat transfer tubes is the same for each pass using partition plates in the header as shown in FIG. 2, the heat transfer performance is not good for the following reasons. That is, since it is a condenser, steam condenses in the direction of the heat medium flow path and becomes liquid, reducing the steam flow rate. Therefore, the steam flow rate in the path closer to the outlet becomes slower, and heat transfer performance deteriorates. On the other hand, increasing the overall steam flow rate is undesirable because the pressure loss becomes too large.

An object of the present invention is to improve condensing performance without increasing pressure loss in the tubes by keeping the steam flow rate in the heat exchanger tubes constant except for the final pass in a condenser having a large number of heat exchanger tubes and a plurality of passes. , the final pass is to sufficiently condense the steam.

A feature of the present invention is that in a condenser having a large number of heat exchanger tubes and headers at both ends of the heat exchanger tubes, a partition plate for configuring a heat medium flow path into a plurality of passes is provided in the header, and the partition plate The interval of
The number of heat exchanger tubes in each pass except the final pass decreases sequentially from the heat medium inlet side to the outlet side, and the number of heat exchanger tubes in the final pass is one path upstream from the final pass. This is because the number of heat exchanger tubes was set to be greater than the number of heat exchanger tubes.

An example of the condenser of the present invention will be explained below with reference to FIG.

In FIG. 3, a header 1 is provided at both ends of a large number of heat exchanger tubes 2 to distribute heat medium vapor within the heat exchanger tubes 2. Inside this header 1, a heat medium flow path is formed in a plurality of passes. Partition plate 3 for configuring
is provided. By appropriately setting the intervals between the partition plates 3, the number of heat transfer tubes (N ₁ , N ₂ . . . ) for each pass is changed.

In this embodiment, the number of passes is gradually decreased from the heat medium inlet 4 side, and only the final pass number is increased again.
That is, N ₁ >N ₂ >N ₃ and N ₄ >N ₃ .

A condenser with a header having such a structure can keep the steam flow rate in the heat transfer tubes constant except for the final pass, and can improve condensation performance without increasing pressure loss in the tubes. As shown in Fig. 3, among the divided header chambers partitioned by partition plates 3, an outlet 5 is provided in the one without a heat medium inlet 4, and the liquid separated into gas and liquid in each divided header chamber is extracted, and only uncondensed vapor is extracted. Even higher heat transfer performance can be obtained by allowing the heat to flow into the next path. On the other hand, the final pass requires complete condensation of the steam. Therefore, the flow rate of steam in the pipe in the final pass cannot be increased beyond the point at which condensation occurs. Therefore, the heat transfer performance of the final pass is lower than that of the other passes, so the number of heat transfer tubes is again increased.
Of course, if steam is allowed to mix in at the condenser outlet, there is no need to increase the number of heat exchanger tubes in the final pass.

FIG. 4 shows another embodiment of the condenser of the present invention.
In this embodiment, the outer shape of the header is circular. Even in such a case, the operation is the same as the embodiment shown in FIG. The outer shape of the header is the same even if it is a square box. Also, in Figure 3, the number of passes is 4.
is shown, but if the number is increased, the proportion occupied by the final pass will be reduced and the heat transfer performance will be improved.

As explained above, according to the condenser of the present invention, the interval between the partition plates provided in the header is such that the number of heat transfer tubes for each pass decreases sequentially toward the outlet side of the heat medium, and Since the number of heat exchanger tubes is set to be greater than the number of heat exchanger tubes in the upstream pass, the steam flow rate in the heat exchanger tubes other than the final pass can be kept constant, without increasing the pressure loss inside the tubes. Since the condensation performance can be improved and the steam flow velocity in the pipe can be reduced in the final pass, the effect of sufficiently condensing the steam can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a condenser having a conventional header structure, FIG. 2 is a schematic front view showing another example of a condenser having a conventional header structure, and FIG. 3 is a schematic front view showing another example of a condenser having a conventional header structure. FIG. 4 is a partially sectional front view showing an example of the condenser of the present invention, and FIG. 4 is a schematic diagram showing another example of the condenser of the present invention. 1...header, 2...heat exchanger tube, 3...partition plate.

Claims (1)

[Claims] 1. In a condenser having a large number of heat exchanger tubes and headers at both ends of the heat exchanger tubes, a partition plate is provided in the header for configuring the heat medium flow path into a plurality of passes, and the interval between the partition plates is adjusted to the final The number of heat exchanger tubes in each pass, except for the pass, decreases sequentially from the heat medium inlet side to the outlet side, and the number of heat exchanger tubes in the final pass is set in the pass one upstream from the final pass. A condenser characterized in that the number of heat transfer tubes is set to be greater than the number of heat transfer tubes.