JPS6242241Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a feed water heater.

FIG. 1 is a sectional view showing the structure of a conventional feed water heater. This heater is a heat exchanger that increases the temperature of the feed water and increases the efficiency of the plant by exchanging heat between the feed water and steam through heating pipes. This heat exchanger consists of a water chamber 1 for distributing water supply to heating tubes 6, and a body body 4 in which a large number of heating tubes 6 are arranged, and the water chamber and the body body are separated by a tube plate 3. The water chamber 1 is divided into a water supply inlet side and an outlet side by a partition plate 2, and the supplied water enters the water chamber 1 from the water supply inlet 7, passes through the heating pipe 6, and exits from the water supply outlet 8. There is an intermediate shell 5 between the tube plate 3 and the shell main body 4, and the intermediate shell has an inner cylinder 12 constituting a superheated steam reducing section for exchanging heat between the superheated steam and the feed water. There is. The steam entering from the steam inlet 9 passes through this inner cylinder 12, and in the steam condensing section 13 where saturated steam is condensed, the direction is changed by the baffle plate 11 while exchanging heat with the feed water to become condensed drain, and the condensed drain is further cooled. It exchanges heat with the supplied water in the section 14 and exits from the drain outlet 10. In this structure, in order to alleviate the effects of temperature changes on superheated steam, the inner cylinder 12, which is the superheated steam reducing section, is separated from the main body of the shell, as shown in FIG. A steam passage 20 connects the two. In this case, the steam entering from the steam inlet 9 passes through the steam passage 20, returns once in the axial direction toward the tube plate, and then enters the inner tube 1.
2, and then proceed toward the main body of the trunk, so the − in FIG. 2 in FIG.
As shown in the cross-sectional view, the steam passage 2
0 rests on the inner cylinder 12 in a convex shape. For this reason, the heating tubes 6 cannot be arranged in a circumferential manner, and the outer diameter of the body becomes large.

The present invention aims to suppress the increase in the outer diameter of the trunk body caused by the conventional structure.

FIG. 4 is a cross-sectional view of the inner cylinder, which is the superheated steam reducing section according to the present invention, and FIG. 5 is a cross-sectional view taken along the - line in FIG. 4.

In the present invention, by arranging the steam passages 20 not only in the axial direction but also in the circumferential direction, the heating tubes 6 in the inner cylinder 12 can be arranged in a circumferential manner.
The superheated steam that entered from the steam inlet 9 passes through this steam passage 2.
0 flows not only in the axial direction but also in the circumferential direction, enters the inside of the inner cylinder through the side inlet 15 provided on the side of the inner cylinder 12, and comes into contact with the heating tube 6. This improves heat exchange between the steam and the feed water. Further, by arranging the steam passages, it is possible to suppress an increase in the diameter of the main body.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a conventional water supply system, Figure 2 is a sectional view of the superheated steam reducing section in Figure 1, Figure 3 is a sectional view taken along the - line in Figure 2, and Figure 4 is a superheating system according to the present invention. A cross-sectional view of the steam reduction section, and FIG. 5 is a cross-sectional view taken along the - line in FIG. 4. 1... Water chamber, 2... Partition plate, 3... Tube plate, 4...
...Body body, 5...Intermediate shell, 6...Heating tube, 7...
Water supply inlet, 8...Water supply outlet, 9...Steam inlet, 1
0...Drain outlet, 11...Jiyama board, 12...
Inner cylinder, 13... Steam condensing section, 14... Drain cooling section, 15... Steam inlet, 20... Steam passage.

Claims (1)

[Scope of utility model registration request] In a feed water heater having an inner cylinder constituting a superheated steam reducing section inside the body, a steam passage from a steam inlet to an inlet of the inner cylinder is formed in a circumferential shape around the inner cylinder, A feed water heater characterized in that a steam inlet is provided on the side.