JPS58187788A - Condenser - Google Patents

Abstract

PURPOSE:To improve the flow of steam by internally containing a cooling tube in an uncondensed gas bleed tube, thereby eliminating a partition plate of preventing the blow-through of the uncondensed steam into the bleed tube. CONSTITUTION:A condenser has a cooling chamber 15 and water chambers 12, 13, the chamber 15 has a pipe nest 6 in which cooling tubes 1 are disposed densely at the center and roughly at the periphery and supported by a pipe plate 4 and a pipe supporting plate 2, and the exhaust steam 14 of a turbine which is introduced to the chamber 15 is introduced to the center of the nest 6. Cooling pipes 21 are held and internally contained in a semicircular deflecting plate 22 in an uncondensed gas bleed tube 3. Holes are arranged alternately at the upper and lower parts of this plate 22. Uncondensed gas such as air or ammonia gas in the chamber 15 and the partial steam which is not condensed in the next 6 are introduced through the hole part 10 into the tube 3, and flowed longitudinally of the tube while moving in a zigzag between the pipes 21.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a condenser, and more particularly to an arrangement of cooling pipe groups in an air cooling section of a steam turbine condenser.

Steam turbine condensers are usually provided with a so-called air cooling section. The reason for installing this air cooling section is as follows.

The area from the low pressure stage of the steam turbine to the inside of the condenser is under negative pressure, and air cannot be avoided from flowing in from the communicating steam pipe furanone, etc. between the two. This mixed air is accumulated in the condenser together with ammonia gas and the like generated when hydrazine, which is used to prevent corrosion of steel pipes, is decomposed in the boiler and is injected into the feed water of the high-pressure feed water heater. These non-condensable gases are generally accompanied by steam, and this accompanying vapor is recondensed,
An air cooling section is provided to reduce the gas volume and relieve the load on the air extractor.

FIGS. 1 to 3 show the side where a conventional condenser and air cooling section are arranged. Here, the turbine steam 14 flows from the surroundings into a cooling chamber 15 in which a tube nest 6, which is a collection of cooling pipes 1, is arranged.
Most of the steam is condensed and condensed by the cooling water flowing through the condenser cooling pipe 1. Further, mixed air, ammonia gas, and some steam flow into the non-condensable gas bleed pipe 3 through the holes 10 and are guided to the air cooling section 7.

Here, a part of the steam is condensed and the non-condensable gas (.1) is further cooled and discharged through an air extraction pipe 8 by an air extractor 9. This air cooling section 7 is

The upper and side surfaces are recessed by a partition plate 5, and the tube nest 6 around 9 is
In order to prevent uncondensed steam from flowing directly into the non-condensed gas bleed pipe 3, in the tube nest 6 between the support plates 2 holding the cooling pipe 1, a second A partition plate 11 shown in the figure is provided. 4 is the tube plate, 12
13 is a water chamber, 16 is a casing, 17 is a central cavity of the tube nest, and 18 is a condensate water. This method of arranging the air cooling section has the following drawbacks.

(7) Providing the partition plate 5.11 within the tube bundle requires extra space and is difficult to manufacture.

(b) Part of the tube nest is partitioned with a partition plate, which biases the flow of steam and promotes unevenness in steam velocity, increasing pressure loss.

An object of the present invention is to provide a condenser with excellent performance that solves the above-mentioned drawbacks.

An embodiment of the condenser according to the present invention is described below in attached Section 4.5.
This will be explained based on the diagram.

In Fig. 4 and Fig. 5 (v-■ arrow view in Fig. 4), the condenser consists of a cooling chamber 15 and water chambers 12 and 13.
5 is a cooling chamber 15 in which a tube nest 6 with a tube arrangement density in the center and sparse in the periphery of the cooling tube 1 is held by the tube plate 4 and the tube support plate 2;
The turbine exhaust steam 14 is guided to the center of the tube bundle 6. The central part 17 of the tube nest has a hole 1 on the outer surface.
A non-condensable gas bleed pipe 3 provided with 0 is installed. A cooling pipe 21 is housed inside the non-condensable gas bleed pipe 3 and is held by a semicircular baffle plate 22 . As shown in FIG. 4, the baffle plates 22 are arranged so that the openings are arranged vertically (or horizontally) alternately. Non-condensable gases such as air and anomonia gas in the cooling chamber 15 and a part of the steam that is not condensed in the tube nest 6 are exclusively transferred to the non-condensable gas bleed pipe 3 through the holes 10 and between the built-in cooling pipes 21. It flows in the longitudinal direction of the pipe while meandering. At this time, the uncondensed vapor is condensed, and the uncondensed gas is cooled and discharged through the air extraction pipe 8 in the air extractor 9.

As explained above, according to the present invention, since the cooling pipe 21 is built in the non-condensable gas bleed pipe 3, a partition plate 5 is provided in a part of the tube nest 6 to partition the air cooling section 7 and the tube nest 6. Furthermore, the partition plate 1 prevents uncondensed steam from venting into the uncondensed gas bleed pipe.
1 is no longer necessary, the flow of steam is improved, and wasted space can be saved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the structure of a conventional condenser. 2 is a sectional view in the ■-■ direction of FIG. 1, FIG. 3 is a sectional view in the ■-■ direction of FIG. 1, FIG. 4 is a sectional view of the condenser according to the present invention, and FIG. It is a sectional view in the ■-■ direction of the figure. 6: tube nest, 21: cooling pipe, 22: deflection plate. 3: Non-condensable gas extraction pipe 388

Claims (1)

[Claims] A cooling pipe group that cools and condenses the steam led into the condenser; A condenser equipped with a non-condensable gas extraction pipe that has a built-in baffle plate that makes the gas meander.・