JPH0645127Y2 - Deaerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a tray type deaerator for deaerating condensate, particularly condensate sent to a boiler.

[Conventional technology]

Condensate sent to a boiler installed in a thermal power plant, a nuclear power plant, a chemical plant, and an in-house power generation facility removes oxygen dissolved therein, that is, is sent to a deaerator for deaeration. The structure of the deaerator is conventionally known as shown in FIG. In the figure, a water storage case 4 provided with a flat plate-shaped perforated bottom plate 3 having a large number of holes 2 is provided in an upper portion inside a casing 1. To the water storage case 4, a header 6 that is orthogonally connected to a water supply pipe 5 that is inserted into the casing 1 from the outside is connected via a lead-out pipe 7. In addition,
8 is a vent guide tube for discharging the gas in the casing 1, 9
Is a vent pipe, and 11, 12 are water storage cases 4, 4, respectively.
It is a support for supporting the Hedsda 6. A plurality of trays 13 are provided in an intermediate portion inside the casing 1.
A funnel-shaped water collecting pipe 15 provided with a steam guide pipe 14 below 13
And the hot well into which the water collecting portion 16 of the water collecting pipe 15 is inserted.
17 are provided. Reference numeral 18 denotes a steam guide tube which is located in the water collecting portion 16 of the water collecting tube 15 and which penetrates the hot well 17 and communicates with the steam inlet tube 19. A steam supply pipe 22 having a jetting header 21 for jetting steam into the hot well 17 is provided in the hot well 17.
Is provided. 23 is the perforated bottom plate 3 of the water storage case 4.
A water supply pipe for sending condensate water that has naturally fallen out of the casing and deaerated to the outside of the casing 1, and 24 is a communication pipe that connects the water supply pipe 23 and the bottom of the casing 1.

When condensate water supplied from the outside is supplied to the header 6 from the water supply pipe 5 by such a structure, the condensate water is supplied to the water storage case 4 via the outlet pipe 7 and is stored therein. The stored condensate drops from the perforated bottom plate 3 and is sprayed into the casing by the trays 13 in a plurality of stages. Then, the water is collected in the water collecting pipe 15 and stored in the hot well 17.

On the other hand, steam is supplied from the steam supply pipe 22 to the jetting header 21. Then, steam is ejected from the jetting head 21 into the hot well 16 to heat the condensed water stored in the hot well 16,
It is boiled to generate steam, which flows upward through the steam guide pipe 14 of the water collection pipe 15 and heats the condensate falling from the perforated bottom plate 3 and tray 13 to vaporize and dissolve dissolved oxygen in the condensate. I care. The steam supplied from the steam supply pipe 19 to the casing 1 flows upward through the steam guide pipe 18 and degass the condensate in the same manner as described above. The condensed water degassed in this way is collected in the hot well 17, and as described above, the condensed water overflowing from the hot well 17 flows between the hot well 17 and the casing 1 and flows through the water supply pipe 23. Water is then sent to the outside.

[Problems to be solved by the device]

In the above deaerator, the formation of the condensate water column that falls from the flat perforated bottom plate 3 of the water storage case 4 is governed by the rate at which the condensate flows out from the holes determined by the height of the condensate water level on the perforated bottom plate. Therefore, if the amount of condensate flowing into the deaerator decreases, the water level of the condensate on the perforated bottom plate will decrease, so the outflow rate from the holes will slow down and the water column will not be formed, and the contact with steam rising from below will occur. Is incomplete, which results in poor heat transfer from the steam to the condensate. Therefore, since the condensate water is not sufficiently heated, the dissolved oxygen in the condensate water cannot be vaporized and the performance of the deaerator deteriorates.

The object of the present invention is to provide a deaerator capable of sufficiently deaerating the condensate by forming a water column that drops from the porous bottom plate of the water storage case even if the amount of the condensate flowing into the deaerator decreases. Is to provide.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, according to the present invention, a case having a perforated bottom plate for storing condensate supplied from the outside is provided above the inside of a casing, and condensate stored in the case and falling from the perforated bottom plate is provided. In a deaerator for heating condensate by heating it with steam supplied from the outside and flowing upward from below the casing, the porous bottom plate has a structure having a plurality of steps having steps.

[Action]

Since the porous bottom plate has a structure having a plurality of steps, even if the amount of condensed water supplied is reduced, the height of the water level at the lowest step of the stepped porous bottom plate is maintained. For this reason, a condensate water column that falls from the perforated bottom plate is formed, so that heat transfer from the steam to the condensate does not deteriorate, and the condensate water is sufficiently degassed even if the amount of condensed water is reduced.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a partial sectional view of a deaerator according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of a P portion of FIG. The first
In FIG. 2 and FIG. 2, the same parts as those of the conventional example of FIG. 1 and 2, the difference from the conventional example is that the perforated bottom plate 3 is the inner perforated bottom plate 21.
And the outer perforated bottom plate 22 and the outer perforated bottom plate 22 that surrounds the perforated bottom plate 21 at a step.

With such a structure, the condensate flowing from the water supply pipe 5 into the water storage case 4 forms a water level corresponding to the resistance of the holes of the inner and outer porous bottom plates 21 and 22, and the perforated bottom plate has a flow velocity corresponding to the height of the water level. A water column is formed from the holes of the inner and outer perforated bottom plates 21 and 22 of 3 and falls downward. At this time, the amount of condensate that flows in decreases, and for example, even when the water level at low load 24 shown in FIG. 2 is reached, the condensate water level on the inner porous bottom plate 21 is high, so the inner porous bottom plate 21
The condensate water column that falls from is well formed, and good degassing performance is obtained. In this case, the height of the water level of the outer porous bottom plate 22 is reduced, and the deaeration performance of the condensed water falling from this porous bottom plate 22 is reduced, but this performance degradation is estimated and the inside is adjusted to cover this amount. By setting the depth of the porous bottom plate 21, the degassing performance can be enhanced.

[Effect of device]

As is clear from the above description, the perforated bottom plate of the water storage case has a multi-stepped shape with steps, so that even if the condensed water flowing into the deaerator is reduced, the water level from the lowest perforated bottom plate part Since a sufficient height can be taken, the water column of condensate falling from the perforated bottom plate is well formed, and there is an effect that deaeration is sufficiently performed.

[Brief description of drawings]

FIG. 1 is a partial sectional view of a deaerator according to the present invention, FIG. 2 is an enlarged sectional view of a portion P in FIG. 1, and FIG. 3 is a sectional view of a conventional deaerator. 1: Casing, 3: Perforated bottom plate, 4: Water storage case, 21: Inner perforated bottom plate, 22: Outer perforated bottom plate.

Claims (1)

[Scope of utility model registration request] 1. A casing having a perforated bottom plate for storing condensate supplied from outside is provided above the inside of the casing, and condensate stored in the case and falling from the perforated bottom plate is supplied from the outside from below the casing. A deaerator which deaerates condensate by heating it with steam flowing upward, wherein the perforated bottom plate has a structure having a plurality of steps having steps.