JPH07159058A - Condenser - Google Patents

Abstract

PURPOSE:To improve air bleeding performance by a method wherein an air bleeding hole for extracting air and uncondensed steam is provided on the side surface of a partition wall for turning a flow of steam in an air cooling chamber to a rising flow and a condensate thin pipe for draining condensate is provided downwardly from the lower section of the air copling chamber. CONSTITUTION:Noncondensing gas and uncondensed steam flows into an air cooling chamber from a condensate thin pipe 11 and air bleeding holes 12 provided separately in a vertical partition wall 10, in a cross section, and from an air bleeding pipe 3 in the axial direction of pipe. The condensate produced at upper cooling pipes 2 falls to the lower section of the air cooling chamber; however, a certain amount thereof is held in the pipe 11 by surface tension and only the condensate having condensed in a certain period of time flows out under the force of gravity. In order to surely discharge the condensate out of the chamber, it is necessary to make the diameter of the pipe 11 larger; however, the pipe 11 can be always filled with the condensate held in the pipe 11, against the steam, so that the pressure can be kept low.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a condenser for condensing steam, and more particularly to an air cooling chamber of a condenser having a structure for discharging condensed water.

[0002]

2. Description of the Related Art A condenser has a lower pressure than the atmosphere and leaks non-condensable gas such as air. It is important to extract the non-condensable gas to the outside of the condenser, because if the non-condensable gas accumulates, the condensation in the cooling pipe is hindered. Figure 3 shows the structure of the condenser. The steam from the turbine is condensed in the tube nest 4, and the non-condensed gas and the uncondensed steam are extracted from the air extraction pipe. In order to further condense the uncondensed vapor to lower the pressure of the air extraction pipe and improve the extraction capacity, the air cooling chamber 1 is provided in a part of the cooling pipe in the pipe axial direction. The air cooling chamber 1 raises the mixed gas of the non-condensable gas and the unvaporized vapor to separate the condensate and the non-condensable gas that fall due to gravity, and the cooling pipe 2 of the air cooling chamber 1
The structure will condense uncondensed steam. Air cooling room 1
The condensate condensed in (1) drops downward, passes through the air extraction pipe, and finally flows out from the condensate outflow hole 7 to the outside of the condenser.

[0003]

When condensed water condensed in the air cooling chamber 1 accumulates in the air extraction pipe, the flow path of the mixed gas of the non-condensed gas and the unvaporized steam is narrowed and the air extraction performance is deteriorated.

An object of the present invention is to provide an air cooling chamber which does not narrow the flow path of a mixed gas of non-condensable gas and unvaporized steam.

[0005]

The simplest method of preventing condensed water from accumulating in the air extraction pipe is to provide a condensate outlet separately from the air extraction pipe. On the other hand, the function of the air cooling chamber is to condense uncondensed vapor from the air extraction pipe and keep the inside of the air extraction pipe at a low pressure. If the condensate outlet is provided separately from the air extraction pipe, the pressure cannot be kept low because it is connected to the outer side of the air extraction pipe having a high pressure. In the present invention,
We focused on the condensate generated in the air cooling room. That is, if the condensate outlet is a downwardly directed thin tube, the condensate is held in the tube by a certain amount due to surface tension, and only the condensed water that has condensed within a certain time flows out. Condensate held in the capillaries can always block the capillaries against steam and keep the pressure low.

[0006]

The condensate produced by condensation in the upper cooling pipe is held in the thin tube by a certain amount by surface tension, and only the condensate condensed within a certain time flows out. Condensate held in the capillaries can always block the capillaries against steam and keep the pressure low.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.
1 is a sectional view of an air cooling chamber of the present invention, FIG. 2 is a side view, 10 is a partition wall, 11 is a condensate outflow thin pipe, 12 is an air extraction hole, 2 is a cooling pipe, 3 is an air extraction pipe. . The non-condensable gas and the unvaporized steam flow into the air cooling chamber from the air extraction hole 12 provided in the vertical partition wall 10 separately from the thin tube 11 in the cross section and from the air extraction tube in the tube axis direction. Condensate produced by condensation in the upper cooling pipe 2 falls to the lower part of the air cooling chamber, but is held in the thin pipe 11 by a certain amount due to surface tension, and only condensate condensed within a certain time flows out by gravity. Although it is necessary to make the thin tube 11 thick in order to reliably discharge the condensate to the outside of the room, the condensate held in the thin tube 11 can always block the thin tube against steam and keep the pressure low. . When the thin tube 11 is made thicker so that it cannot hold the condensate due to the surface tension, the same effect can be obtained by bending the thin tube 11 into an S shape to form a pool of condensate as shown in FIG. 1B. .

[0008]

According to the present invention, the condensed water can be prevented from accumulating in the air extraction pipe and the pressure can be kept low, so that the air extraction performance can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view of an air cooling chamber of the present invention.

FIG. 2 is a side view of the air cooling chamber of the present invention.

FIG. 3 is a perspective view of a condenser.

[Explanation of symbols]

1 ... Air cooling chamber, 2 ... Cooling pipe, 3 ... Air extraction pipe, 10 ...
Partition wall, 11 ... Condensate outflow thin tube, 12 ... Air extraction hole.

Claims (1)

[Claims] 1. An air cooling chamber of a condenser having a tube group composed of a plurality of horizontal tubes, wherein steam is condensed on the surface of the horizontal tubes, and a partition wall for increasing the steam flow inside the air cooling chamber is provided. And that an air extraction hole for extracting air and uncondensed vapor is provided on a side surface of the partition wall, and a condensate outflow thin tube is provided downward from the lower portion of the air cooling chamber to let out condensed water. Characteristic condenser.