JPS6080080A - Steam condenser - Google Patents

Abstract

PURPOSE:To increase the condensing performance in a main condenser and prevent overcooling of condensed water by a method wherein a pre-condenser is provided at the upstream side of the group of heat transfer tubes of the condenser for a steam turbine or the like and condensed water, generated in the pre- condenser, is discharged directly by a drain catcher. CONSTITUTION:A pre-condenser 20 is provided at the upper upstream side of a condenser section 11 to pre-condense the steam (b) flowed into a steam inflow section 12. The group of drain catchers 21 is provided at the lower side of the group 20a of cooling tubes of the pre-condenser 20 remaining steam flowing intervals 21c and produced condensed water arrives at a drain reservoir 13, provided below the drain catchers, along the inner wall of a case from both ends of the case. The generating amount of condensed water in the condenser section 11 is comparatively small by the provision of the pre-condenser 20 and the condensed water in the pre-condenser 20 is not provided to the condenser section 11, therefore, water film is not produced on the cooling tubes 11a of the condenser 11, the heat conductivity of the tubes is increased and general steam condensing performance may be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a steam condenser that condenses exhaust gas, that is, steam, from a steam turbine or the like.

To explain a conventional example of a steam condenser (steam condenser) that condenses the exhaust gas, that is, steam, from a steam turbine in a steam power plant, as shown in Figures 1 to 3, steam flows into the upper part of the condenser (1). A part (2) is provided, and a drain reservoir (3) is provided in the lower part. The ice chamber (4b), the upper cooling pipe group (1b), and the drainage chamber (4C) are structured so that the exhaust gas (aluminum) from the steam turbine (not shown) flows through the upper Steam inflow section (2)
As shown in Figures 1 and 2, heat exchanger tubes (IA
, 1α) and is condensed into condensate iC), and the remaining gas is disposed in the center of the heat exchanger tube group (IA, 1z) and passes through the perforated air vent pipe (5) to the exhaust pipe (6) and (7), and the condensate (C) becomes a large number of water droplets (C'') and flows into the drain reservoir (3) at the bottom, where it becomes a reservoir and is taken out to the outside. .

However, in the conventional steam condenser, steam (Al
directly contacts the heat exchanger tube group (1b) (1g) and condensate (C
), a large number of water droplets (CI) are generated, and a water film (C") is formed on the surface of the heat exchanger tube group as shown in FIG. The presence of the water film (C
“) flows over the surface of the heat exchanger tube, so condensate (,71
The disadvantage is that if the temperature drops too much, supercooling occurs, resulting in lower condensation efficiency and poor deaeration.

The present invention was developed in order to eliminate the above-mentioned drawbacks of conventional steam condensers. A pre-condenser is provided at the upper upstream part of the part of the condenser, and a group of drain catchers are provided below the cooling pipe group of the pre-condenser and arranged in parallel with a steam flow interval, and an end of the group of drain catchers is provided. It is characterized in that a drain flow path is provided between the part and the drain part, bypassing a part of the capacitor,
The purpose of this is to install a pre-condenser on the upstream side of the heat transfer tube group of a part of the condenser! A steam condenser which improves condensation performance in a main condenser and prevents overcooling of condensate, eliminating the above-mentioned drawbacks by directly discharging condensate generated in the pre-condenser through a drain catcher. The point is that it provides

The present invention has the above-mentioned structure, and the steam flowing into the upper steam inflow section is condensed by contacting the cooling pipe group of the pre-condenser, and the condensed water is directly caught by the lower drain catcher group. The steam is discharged from the end through the drain flow path to the drain reservoir at the bottom, and the steam that has been pre-condensed by the pre-condenser passes through the steam flow interval of a group of drain catchers to a group of cooling pipes in a part of the main condenser on the downstream side. Due to the pre-condensation process by the pre-condenser and the discharge of the condensate, the amount of condensate in the cooling pipe group of a part of the main condenser is significantly reduced, preventing the formation of a water film, and improving heat transfer. The condensate performance is improved significantly, and the condensate in the pre-condenser is directly discharged to the drain reservoir by a group of F sink catchers and the drain passage, and the condensate in the main condenser part is Since the amount of condensate generated is reduced and water droplets are quickly flowed into the lower drain reservoir, proper cooling of the condensate is prevented and a decrease in plant efficiency can be prevented.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

An embodiment of the present invention is shown in FIGS. 4 to 6,
In the figure, (11) is a part of the condenser, (11α) is a group of cooling pipes for the condenser part αD, (14α) is a water supply chamber for the cooling water (α), and (14A) is an intermediate ice chamber, which is the cooling water (α). ) is introduced into the cooling pipe group (11α) from the water supply chamber (14α) and distributed to the intermediate ice chamber (14h).
A steam inlet fIS (I7J) is provided in the upper part of the capacitor 0, and a drain reservoir a3 is provided in the lower part of the condenser part Q11.

Furthermore, in the embodiment of the present invention, a pre-condenser is provided in the upper upstream part of the condenser part α9, and the steam (h) flowing into the steam inflow part R is pre-condensed by the pre-condenser (A). Cooling water (al) is introduced into the cooling pipe group (亦) of the pre-condenser from the second water supply chamber (15α) connected to the intermediate ice chamber (14M), and the cooling water (al) is introduced into the drainage chamber (15b). ).

In addition, the cooling pipe group (20α) of the pre-condenser (7)
A group of drain catchers (211) are provided below the steam flow interval (21c)'aj, and a drain catcher (211) is connected from both ends of the drain catcher group (211) to the lower drain reservoir (13) along the inner wall of the case. Some (1
The drain flow path (22) (21) detoured from 11.

To explain the drain catcher group 3υ in more detail, each drain catcher is arranged diagonally below the cooling pipe group (20α) of the pre-condenser (A) to receive water droplets of condensate, as shown in FIG. The swash plate part (
21α) and a bridge portion (21j) provided along the lower edge of the swash plate portion (21α) to catch and guide the water droplet t, and the swash plate portion (21α) and the bridge portion (21b) As shown in FIG. , the gutter 111 (21A) is the fifth
As shown in the figure, it has a chevron shape and is configured to guide the captured condensate to both ends of the CI Y and introduce it into the upper part of the drain flow path.

In addition, (5) in the figure is an air vent pipe that is arranged in the center of the cooling pipe group (11α) of the main condenser part a0 and has many air holes, and (6) and (7) are air vent pipes (5). ) is an exhaust pipe connected to the exhaust pipe.

The illustrated embodiment of the present invention has the above-mentioned configuration, and to explain the operation and effect, the cooling water (g) is supplied from the water supply chamber (14α) to each cooling pipe (14α) of the condenser part α9.
1α), enters the intermediate ice chamber (14h), and then enters the second water supply chamber (15α) from the intermediate ice chamber (14h).
) to each cooling pipe (20α) of the pre-condenser (to)
The water flows inside and is drained from the drainage room (15h), and
Exhaust gas (A) from a steam turbine (not shown), etc.
The water flows into the upper steam inlet part 0 and contacts each cooling pipe (20α) of the pre-condenser screen and is temporarily condensed to produce condensate, but this condensate flows through each drain catcher of the drain catcher group Qυ. After flowing down on the swash plate part (21a) of - and being caught by each bridge part (21A) and guided to the end thereof, part of the capacitor (
11) The condensate generated by the pre-condenser is directly flowed into the lower drain reservoir 0 by bypassing the cooling pipe group (11α) in the main condenser (11).
The cooling of 11) does not come into contact with the group (11α).

Furthermore, the steam pre-condensed by the pre-condenser (A) (hl is a group of drain catchers (21)
The vapor in the main condenser part (11) passes through the large number of vapor flow intervals (21C) in the main condenser part (11) and is condensed again to generate condensate water. The amount of condensate generated is relatively small due to the pre-condensation treatment, and since condensate is not provided in the pre-condenser (7) as described above, each cooling pipe (11α) of the condenser (11) As mentioned above, the condensate in the condensate is reduced to a small amount and falls as water droplets, eliminating the formation of a water film, thereby significantly improving heat transfer and overall steam condensation performance.

In addition, the condensate (c) in the pre-condenser is collected by a group of drain catchers ρυ and a drain channel (2) as described above.
At the same time, the condensate (C) in the main condenser part a9 suddenly flows directly into the drain reservoir a at the bottom and is discharged. As soon as C') occurs, the drain reservoir a at the bottom
3, the condensate is prevented from being properly cooled and a decrease in plant efficiency is prevented.

In addition, each bridge part (21A) of the drain catcher group Q1
) is formed into a chevron shape and both ends are formed low, but it is also possible to have a configuration in which only one end is formed diagonally and low, and in this case, the drain flow path is only on one side.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a conventional steam generator, FIG. 2 is a cross-sectional view of FIG. 5 is a cross-sectional view of FIG. 4, and FIG. 6 is a partially enlarged perspective view of a group of drain catchers shown in FIG. 4. 11: Part of the condenser (main) 12: Steam inflow part 1
3: Drain W 20 near recondenser 21: Drain catcher group 22: Drain flow path 11α, 20α: Cooling pipe group α: Cooling water h: Steam C: Condensate condensation agent Patent attorney Shige Okamoto 3 other people

Claims (1)

[Claims] In a steam condenser in which a steam inlet is provided at the upper part of a part of the condenser and a drain reservoir is provided at the lower part, a pre-condenser is provided at the upper upstream part of the condenser part, and a pre-condenser is provided at the lower part of the cooling pipe group of the pre-condenser. A group of drain catchers are installed side by side with a steam flow interval,
A drain flow path that bypasses a part of the capacitor is provided at the end of the group of drain catchers and the drain droplet volume.
Features a steam condenser.