JPS5826992A - Condenser - Google Patents

Abstract

PURPOSE:To enable to prevent the performance deterioration of a condenser upon reverse washing by a method wherein baffle plates as well as air extracting tubes for the condenser are mounted near both tube plates and the air extracting tubes are used by switching them upon the reverse washing. CONSTITUTION:Cooling water is flowed into cooling tubes 4 in a direction shown by an arrow sign 11a upon the ordinary operation of a condenser, therefore, a valve 10a is opened and a valve 10b is closed while the air extracted by utilizing baffle plates 7a as well as the air extracting tube 2a at the side of one of tube plates 8a. On the other hand, when the reverse washing operation of the condenser is effected, the flow of the cooling water is changed into the direction shown by the arrow sign 11b, therefore, the valve 10a is closed and the valve 10b is opened to extract the air by utilizing the baffle plate 7b as well as the air extracting tube 2b at the side of the tube plate 8b. According to this method, the performance deterioration of the condenser may be prevented upon the reverse washing.

Description

[Detailed description of the invention] The present invention relates to a condenser.

In a conventional condenser, its air cooling section l is connected to an air extraction pipe 2, as shown in FIGS. 1a and 1b. Steam from the turbine exhaust port is cooled by a cooling pipe 4 fixed to a pipe support plate 3 through which cooling water passes, and is condensed outside the pipe. Most of the steam is condensed through the nine air cooling sections 1 provided in the longitudinal direction of the cooling pipe, and is finally cooled while being bypassed by a baffle plate 7 installed just before the air extraction port 6. The mechanism is such that most of the steam is converted into a drain, and air with a higher concentration is sucked in than through the extraction port.

However, in such a conventional device, there is only one set of baffle plate 7 and air extraction pipe 2 near one of the tube sheets 8a and 8b (there may be more than one set of baffle plates). Because it is equipped with such equipment, when backwashing the condenser, it is cooled with cooling water whose temperature has increased due to heat exchange with steam, which has the disadvantage of deteriorating the performance of the condenser.

The present invention has been made in order to eliminate such problems during backwashing in conventional condensers.

According to the present invention, the baffle plate and the air extraction pipe in the air cooling part of the condenser are installed near both tube sheets, and these air extraction pipes are switched and used during backwashing, so that during f-washing, This is also designed to prevent deterioration of condenser performance.

Embodiments of the present invention will be described in detail below with reference to the drawings.

In FIG. 2, a 1 m baffle plate 7a and an air extraction pipe 2a are shown.
is installed in the vicinity of one of the tube sheets 8a of both tube sheets of the condenser (between the tube sheet and the tube support plate 3 closest to this tube sheet) as in the conventional case. A baffle plate 7b and an air extraction tube 2b are likewise provided according to the invention in the vicinity of the other tube sheet 8b, both air extraction tubes 2a and 2b being connected to the air extraction device 9 via valves 10a and 10b. They are connected so that they can be switched freely.

Therefore, during normal operation of the condenser, the cooling water flows into the cooling pipe 4 in the direction of the arrow 11a, so that the valve 10a
With the valve 10b opened and the valve 10b closed, dry air is extracted using the baffle plate 7a on one tube sheet 8a side and the air extraction pipe 2a. On the other hand, when performing reverse flow operation of the condenser, the flow of cooling water is in the direction of the arrow 11b, so by closing the valve 10a and opening the valve 10b, the baffle plate 7b on the other tube sheet 8b side and the air extraction Air is extracted using tube 2b.

As described above, according to the present invention, since the baffle plates and air extraction pipes in the air cooling section of the condenser are installed in the vicinity of both tube sheets, these two sets of baffle plates and air extraction pipes By switching between the pipes during normal operation and backwash operation of the condenser, cooling water is always available. The lead side can be used effectively, so the effect of the air cooling section is always fully demonstrated, and the condenser performance can be maintained at a normal value even during backwashing.

[Brief explanation of the drawing]

FIG. 1a is a schematic vertical sectional view showing a conventional condenser, FIG. 1b is a schematic cross-sectional view thereof, and FIG. 2 is a diagram similar to FIG. 1b, showing an example of a condenser according to the present invention. . Engineering...Air cooling section, 2a, 2b...Air extraction pipe, 3...
Pipe support plate, 4...Cooling pipe, 7as7b...Baffle plate, 8a
, 8b... tube sheet, 9... air extractor, 10a, 10b
--Valve.

Claims (1)

[Claims] A condenser characterized in that a baffle plate and an air extraction pipe in an air cooling section are respectively installed near both tube sheets, and both of these air extraction pipes are connected to the air extractor in a freely switchable manner.