JPS597886A - Condenser - Google Patents

Abstract

PURPOSE:To omit a tube plate cover for an air-cooling part and prevent raw steam from flowing into the air-cooling part, by locating the position of an air extractor at the second or third span from a tube plate surface. CONSTITUTION:An air-extracting duct 8 for conducting air and accompanying steam from an air-collecting pipe 7 is provided at the second span from the tube plate surface, and a tube plate covering plate for the air-cooling part is welded to the first and second supporting plates, whereby a tube plate cover can be omitted. In addition, a cooling pipe can be inserted easily, and raw steam is prevented from flowing into the air-cooling part.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a condenser for a thermal or nuclear power plant, and particularly to a condenser having a long effective cooling pipe length and a large number of cooling pipe support holes.

The condenser cools the exhaust gas from the turbine through a number of cooling pipes, condenses it, and sends it to the next plant system equipment. On the other hand, non-condensable gases that do not condense and accompanying steam should be cooled again in the air cooling section at the center of the cooling tube network, and then discharged outside the vessel using an air extractor (air extractor or Makabe pump, etc.). As is well known. In the conventional condenser, the air extracted from the condenser guided by this air extraction device was extracted from the first span (first span) from the tube plate surface during the span of the cooling pipe, which resulted in the following shortcomings: There is.

(1) It is necessary to install a cooling pipe nest cover (baffle) for the air cooling section.

(2) Since the cover (baffle) mentioned above needs to be installed closer to the tube sheet than the capacity of the air cooling section, it is difficult to align the tube type with the tube sheet, increasing the number of steps required when inserting the cooling tube. There is.

(3) Also, in order to facilitate the alignment of the tube type mentioned above, the tube type of the cover (baffle) is made larger than the tube type of other support plates, but according to this method, the live steam to the air cooling section This is not desirable as there may be an influx of

SUMMARY OF THE INVENTION An object of the present invention is to provide a condenser in which the tube nest cover of the air cooling section can be omitted and live steam is prevented from flowing into the air cooling section.

The feature of the present invention is that the air extraction position is set at the second and third spans from the tube plate surface, the tube nest cover (baffle) of the air cooling section is omitted, and the cooling tube is inserted. The purpose is to facilitate the cooling and prevent live steam from flowing into the air cooling section.

An embodiment of the present invention will be described with reference to the drawings.

First, FIGS. 1, 2, 3, and 4 show conventional condensers, and each part will be explained using these figures.

1 is a condenser body, 2 is a tube plate provided at both ends of the body 1,
3a and 3b are the cooling water inlet and outlet water chambers attached to both tube sheets 2; 4 is the cooling tube nest attached to both tube plates 2 by the tube expansion method; 5 is the air inside the cooling tube nest 4. 6 is a support plate that supports the cooling pipe set 4; 7 is an air collecting pipe installed in the center of the cooling pipe set 4; 8 is an air extraction duct that guides air from the air joint pipe 7; , 9 is an air extraction port for discharging the air after passing through the air cooling section tube nest 5 to the outside of the device, 10 is an air cooling section tube nest cover (baffle) 11 is an upper fuselage attached to the upper part of the fuselage 1, and 12 is an air extraction port for discharging the air after passing through the air cooling section tube nest 5. A connecting shell attached to the upper fuselage 11 is shown. Conventionally, as shown in this figure, the exhaust gas from the turbine passes through the connecting shell 12 and the upper shell 11, and is evenly divided into the left and right cooling pipe bundles 4 in the fuselage 1, and from the entire circumference of the pipe bundle to the central air cooling section pipes. It flows towards nest 5. The steam that flows into the tube nest comes into contact with a number of cooling pipes, is cooled, and condenses into condensate water.

On the other hand, the air that is not condensed and the steam that accompanies it enters the air collecting pipe 7, passes through the air extraction duct 8, enters the air cooling section pipe nest 5, and after being cooled again, air is released from the air extraction port 9. It is discharged outside the vessel by the extractor. Since the air extraction position at this time is from the first span portion of the tube plate surface, a tube nest cover (baffle) 10 for the air cooling unit tube nest 5 is required.

5, 6, and 7 show an embodiment of the present invention.

According to this example, the air extraction duct 8 that guides the air and associated steam from the air collecting pipe 7 is installed at the second span from the tube sheet surface, and the air cooling section tube nest cover plate is installed at the first and second span. The air cooling unit tube nest cover (baffle) 10 can be omitted by welding it to the support plate. The same result can be obtained even if the position of the air extraction duct 8 is set as the third span due to the structure, arrangement, etc.

As described above, according to the present invention, by setting the air extraction position to the second or third span, the air cooling section tube nest cover to
(baffles) can be omitted, the cooling pipe can be easily inserted, and live steam can be prevented from flowing into the air cooling section.

[Brief explanation of the drawing]

Figure 1 shows the structure of a conventional condenser, and Figure 2 shows the l-
3 is a detailed view of a conventional nitrogen extraction part, FIG. 4 is a side view of FIG. 3, FIG. 5 is a structural diagram of a condenser according to an embodiment of the present invention, and FIG. The figure is a detailed view of the air cooling section in Figure 5, and Figure 7.
The figure is a side view of FIG. 6. DESCRIPTION OF SYMBOLS 1... Body, 2... Tube plate, 3a, 3b... Cooling water inlet/outlet ice chamber, 4... Cooling pipe tube nest, 5... Air cooling section tube nest, 6... Support plate, 7... Air fruit tube, 8...
Air extraction duct, 9... Air extraction port, 10... Air cooling section tube nest cover No. l Country No. 2 Concave No. 3 Fig.

Claims (1)

[Claims] 1. A condenser characterized in that the air extraction position on the condenser body side is arranged so that the air is extracted from both tube plate surfaces to the second or third span of the cooling pipe support span.