JPS6014964B2 - Shell-and-tube heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shell-and-tube heat exchanger, and more particularly to a multi-tubular heat exchanger provided with a drain cooling zone for use in thermal or nuclear power generation equipment.

As shown in FIG. 1, a conventional multi-tubular heat exchanger has a body 1 divided by a tube plate 5, one of which has a water chamber 4a having an inlet 2 for water supply a, and a water chamber 4b having a water supply outlet 3 formed therein. and is provided.

The heat exchanger tube 8 is bent into a U-shape, and one end thereof is connected to the water chamber 4.
A, the other end is fixed to the tube plate 5 so as to open into the water chamber 4b, and is supported by a tube support plate 9. An inlet 6 for steam b and an inlet 7 for drain c are formed on the upper surface of the body 1, and a drain cooling zone 10 for cooling condensate condensed on the water supply inlet side of the body 1 surrounds the water supply inlet side of the heat transfer tube 8. It is formed like this. In this configuration, while the supply water a passes from the water chamber 4a through the heat transfer tube 8, it absorbs heat from the steam flowing down from the steam inlet 6 through the steam passage 14, condensing the steam, and the condensed water (drain) is and number 1 in Figure 3.
As shown in 1, it collects at the bottom of the fuselage and drains into the drain suction part 17.
The water is sent to the drain cooling zone 10 and discharged to the outside from the drain cooling zone 10. 12 is the tube nest, 13
15 is a drain outlet, and 15 is an air vent.

However, since this drain surface is not in a stable state and is in a undulating state, steam flows from the suction part of the drain cooling zone 10 together with the drain into the drain cooling zone 1.
．． Caught inside 0.

When the entrained steam turns into bubbles and collides with the heat exchanger tubes 8, the heat exchanger tubes 8 are eroded, causing leakage of the heat exchanger tubes 8. Furthermore, when steam is sent into the drain cooling zone 10, the pressure loss within the drain cooling zone 10 increases rapidly, and the fluidity of the drain deteriorates. SUMMARY OF THE INVENTION An object of the present invention is to provide a gas entrainment prevention device to the drain suction portion of the drain cooling zone to eliminate the above-mentioned conventional drawbacks. The present invention
By providing a gas entrainment prevention device at the drain suction port, it is possible to prevent steam from being entrained in the drain cooling zone, and to prevent erosion of the transfer pipe by steam bubbles and damage to the flow path caused by steam entering the drain. This prevents deterioration of drain flow due to increased pressure loss.

5 and 6 show an embodiment of the present invention, and reference numeral 18 denotes a gas entrainment prevention member, which is plate-shaped in the illustrated embodiment and is attached to the outer periphery of the drain suction portion 17. 19 in the same shape as the suction part 17 to stabilize the surface of the drain 11 around the suction part and prevent steam from being sucked into the drain cooling zone 10.

The shape of the suction portion 17 is not limited to that shown in the illustrated embodiment, but may be any shape such as rectangular or circular. According to the present invention, it is possible to prevent steam from being sucked into the drain cooling zone, and to prevent erosion of heat transfer tubes by steam bubbles and deterioration of drain flow due to an increase in pressure loss.

[Brief explanation of the drawing]

Figure 1 is a vertical side view of a conventional shell-and-tube heat exchanger, Figure 2 is a sectional view taken along line A-A' in Figure 1, Figure 3 is an enlarged view of a part of Figure 2, and Figure 4 is a cross-sectional view of a conventional multi-tubular heat exchanger. FIG. 3 is a sectional view taken along the line B-B'; FIG. 5 is a sectional view of essential parts showing an embodiment of the multi-tubular heat exchanger according to the present invention;
FIG. 6 is a sectional view taken along line CC' in FIG. 5. 1...Body, 10...Drain cooling zone, 1
1...Drain, 17 Drain suction part, 18...
- Gas entrainment prevention member. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] 1 Around the drain suction part of the drain cooling zone,
A multi-tubular heat exchanger, characterized in that a gas entrainment prevention member is surrounded by a required interval.