JPS5913808A - Feedwater heater - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a feedwater heater installed above the main condensate.

A conventional feed water heater installed above a condenser will be briefly explained.

The body extending in the longitudinal direction is divided into left and right sides by a flat plate, and this body is partitioned by a tube plate, and an ice chamber having a water supply inlet and a water supply outlet is formed on one side. The water enters the ice chamber through the water supply inlet, flows through the heat transfer tube, returns to the ice chamber, and exits through the water supply outlet.

On the other hand, the extracted steam from the turbine enters the desuperheater section through the steam inlet formed in the body, heats the feed water in the heat transfer tube, and is condensed in the condensing section by heat conversion with the feed water in the heat transfer tube. It collects at the bottom of the fuselage, is further cooled by two drain coolers, and is discharged from the drain outlet.

In such a feed water heater where the number of turns in the feed water is two or more, the temperature of the feed water is different between the pipe nest on the feed water inlet side and the pipe nest on the water supply outlet side, so a steam stagnation area occurs in the pipe nest on the feed water inlet side. The non-condensable gas is generated and accumulated in this steam stagnation area, and the non-condensable gas cannot be sufficiently discharged from the non-condensable gas discharge pipe.

However, by providing a non-condensable gas collecting puffle in the non-condensable discharge pipe provided between the water supply inlet side pipe nest and the water supply outlet side pipe nest, the non-condensable gas can be discharged to the outside. In a feed water heater installed at the top of the condenser, the body is partitioned into left and right sides by a flat plate. On the right side, the water enters the lower pipe bundle and exits from the upper pipe bundle, and on the left side, the water enters the upper pipe bundle. Since the flow of the water supply differs depending on the flow of water coming out of the lower tube nest, it is necessary to improve the flow of water supply in the water chamber in order to adopt the above structure.

The present invention provides a feed water heater that prevents corrosion of heat transfer tubes and the like due to steam stagnation, and has good heat exchange performance by allowing the flow of feed water to be the same on both sides, entering through the lower vegetables and fruits and exiting from the upper tube nest. It is in.

To achieve this purpose, the ice chamber is partitioned into a water supply inlet and a water supply outlet on the left and right by a water chamber partition plate, and the water chamber where the water supply inlet and water supply outlet are formed is covered with a fan-shaped cover. The flow of water has been improved so that the water supply enters through the pipe nest on the water supply inlet side (lower part) and exits through the pipe nest on the water supply outlet side (earth part) on both the left and right sides. ' Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 4. The water chamber 5e is partitioned by a water chamber partition plate 14 into a water supply inlet side 10.12 and a water supply outlet 0Iilli, 13, respectively, and the water supply inlet side and the water supply outlet side are connected by heat transfer tubes 6, respectively. Icehouses 10 and 13, in which the water supply population 3 and the water supply outlet 4 are formed, are covered by a fan-shaped cover 15. The water supply flows into the water supply population 3, enters the ice chamber 10, passes through the heat transfer tube, and returns to the water chamber 11. Furthermore, the supplied water flows into the water chamber 12, returns to the water chamber 13 through the entire inside of the heat transfer tube,
It flows out from the water supply outlet 4.

Further, a pipe 20 for discharging noncondensable gas is installed between the water supply inlet side tube nest 16.18 (lower tube nest) and the water supply outlet side tube nest 17.19 (upper tube nest) of the heat exchanger tubes 6. It is designed to exhaust non-condensable gas. An orifice hole is drilled in this discharge pipe, and the non-condensable gas sucked through the orifice hole is passed through a fermentation conduit 23 provided at the end of the discharge pipe 20 to cross the tube nest 1 and the vent seat. 22 to the outside.

The non-condensable gas exhaust pipe 20 has a non-condensable gas discharge pipe 2.
1 is provided. Same 1. The interior of the fuselage is divided into a plurality of tube support plates 7 along the longitudinal direction, and each tube support plate 7 has a cutout shape 26 to form a passage 25 for steam flow. Conventionally, the tube support plates were arranged in a staggered manner, and the airflow flowed along the vertical meandering flow path, resulting in a high flow rate. However, by making the tube support plate 7 into a notched shape, When the flow path area is small, the flow velocity is sufficiently reduced.

As described above, the present invention has the effect of preventing corrosion of the heat exchanger tubes and other parts of the feed water heater and improving heat exchange performance.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of a feed water heater which is an embodiment of the present invention, Fig. 2 is an enlarged view of the I- FIG. 4 is an enlarged cross-sectional view taken along the line ■-■ in FIG. 1...Body, 2...Tube plate, 3...Water supply inlet, 4...
...Water supply outlet, 5...Mizu Asahi, 6...Heat transfer tube, 7...
・Pipe support plate, 10°12...Water supply inlet side, ii, ia
...Water supply outlet side, 14...Water chamber partition plate, 15...
Cover, 16.18...Water supply inlet side pipe nest, 17.19
...Water supply outlet side pipe nest, 3 haze of thatch

Claims (1)

[Claims] (1) A body extending in the longitudinal direction, a tube plate that partitions one side of the body, a water chamber having a water supply inlet/outlet, a plurality of U-shaped heat transfer tubes provided in the body; It is equipped with a tube support plate that supports the heat transfer tubes at 7yr intervals, and a non-condensable gas exhaust pipe installed between the water supply inlet pipe nest and the water supply outlet pipe nest of the heat transfer officer, and the inside of the fuselage is made into a flat plate. In a feed water heater that is divided into left and right sides, a passage for steam flow is provided in the east upper part of the Japanese water outlet side pipe, and on the sides of the water supply inlet side pipe nest and the water supply outlet side pipe nest, and the pipe support plate is cut out to form a body. A feed water heater characterized by allowing steam to flow in the longitudinal direction. 2. Claim 1, characterized in that a panfur is provided along the non-condensable waste discharge pipe for blocking the flow of steam flowing between both the water supply inlet side pipe nest and the water supply outlet side pipe nest. Feed water heater as described. 3. The flow of water supply in the water chamber is set to 01 for the water supply population on both the left and right sides.
ll'# The feed water heater according to claim 1, characterized in that the feed water heater is inserted from the nest side and the water feed outlet side is placed on the east side of the pipe.