JP2017067377A - Condenser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a condenser including a gas cooler capable of efficiently cooling mixture gas of steam and noncondensable gas.SOLUTION: A condenser 1 includes: a condenser body trunk 2 configured to introduce mixture gas from an exhaust duct 3 thereinside, and condense steam in the mixture gas; and a gas cooler 4 connected to a side surface of the condenser body trunk 2, and configured to introduce mixture gas in which steam is condensed by the condenser body trunk 2. The gas cooler 4 is formed so that a cross sectional area of a flow passage is made smaller as approaching a downstream direction of mixture gas flow, and includes a cooling device provided in the flow passage and configured to cool mixture gas.SELECTED DRAWING: Figure 1

Description

The present invention relates to a direct contact type condenser that condenses steam by bringing turbine exhaust gas and cooling water into direct contact with each other.

Turbine exhaust gas in a geothermal power plant is a mixed gas containing a large amount of noncondensable gas along with water vapor, and the amount of noncondensable gas is 3000 to 3000 of a thermal power / nuclear power plant.
It may be about 5000 times. Therefore, in condensers for geothermal power plants,
In order to reduce the load on the air extractor (such as an ejector) and increase the power generation efficiency, it is required to efficiently cool the non-condensable gas and discharge it with a small amount of accompanying steam.

Therefore, some condensers for geothermal power plants are provided with a gas cooler to perform the above-described cooling of the non-condensable gas more efficiently. The gas cooler introduces the mixed gas after the water vapor is condensed in the condenser main body, and further cools the remaining water vapor by spraying,
It is condensed (for example, refer to Patent Document 1).

JP 2010-27092 A

However, as the mixed gas in the gas cooler is cooled, the flow velocity decreases, and the cooling effect due to the stirring effect of the mixed gas may be reduced. Then, this invention aims at provision of the condenser provided with the gas cooler which can cool the mixed gas of a vapor | steam and a noncondensable gas efficiently.

In order to achieve the above object, a condenser according to the present invention includes a condenser main body cylinder that introduces a mixed gas from an exhaust duct and condenses vapor in the mixed gas, and a side surface of the condenser main body cylinder. Connected to
A gas cooler for introducing a mixed gas in which steam is condensed in the condenser main body, and the gas cooler has a channel cross-sectional area that decreases in the downstream direction of the mixed gas flow, and is mixed in the channel. A cooling device for cooling the gas is provided.

1 is a schematic cross-sectional view showing a condenser according to a first embodiment of the present invention. The gas cooler of the condenser which concerns on the 1st Embodiment of this invention is shown, (a) is a schematic top sectional drawing, (b) is a schematic cross-sectional view. The gas cooler of the condenser which concerns on the 2nd Embodiment of this invention is shown, (a) is a schematic top sectional drawing, (b) is a schematic cross-sectional view. The gas cooler of the condenser which concerns on the 3rd Embodiment of this invention is shown, (a) is a schematic top sectional drawing, (b) is a schematic cross-sectional view. The gas cooler of the condenser which concerns on the 4th Embodiment of this invention is shown, (a) is a schematic top sectional drawing, (b) is a schematic cross-sectional view. The gas cooler of the condenser which concerns on the 5th Embodiment of this invention is shown, (a) is a schematic top sectional drawing, (b) is a schematic cross-sectional view. The schematic cross-sectional view which shows the gas cooler of the condenser which concerns on the 6th Embodiment of this invention.

  Embodiments of the present invention will be described below.

(First embodiment)
Hereinafter, a condenser according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic cross-sectional view showing a condenser according to a first embodiment of the present invention. FIG. 2 shows a gas cooler of a condenser according to the first embodiment of the present invention, in which (a) is a schematic top sectional view and (b) is a schematic transverse sectional view.

As shown in FIG. 1, the condenser 1 includes a condenser main body 2, an exhaust duct 3, and a gas cooler 4. The condenser 1 is a direct contact condenser for geothermal heat, and an axial exhaust type that takes in steam discharged from the rear of the turbine in the horizontal direction can be applied.

An exhaust duct 3 is connected to the upper side of the condenser main body 2. The exhaust duct 3 is a turbine (
Vapor (mixed gas) exhausted from (not shown) is introduced into the condenser main body 2. The condenser main body 2 has a steam condensing device (not shown) such as a spray or a tray, forms a hot well in the lower part, and discharges the condensed steam from the bottom.

As shown in FIG. 2, the gas cooler 4 has a gas cooler outlet 5, a flow path forming member 6, and a spray nozzle 7 as a cooling device. In the gas cooler 4, one end of a long cylindrical shape is connected to a surface on the side opposite to the exhaust duct 3 in the side surface of the condenser main body 2, and a flow path is extended in a direction opposite to the exhaust duct 3. A gas cooler outlet 5 is provided at the end of the flow path of the gas cooler 4 to discharge the cooled gas.

The flow path of the gas cooler 4 is formed by the flow path forming member 6 so that the cross-sectional area of the flow path becomes smaller in the downstream direction of the mixed gas flow. Alternatively, not only the flow path is narrowed by the flow path forming member 6, but the casing of the gas cooler 4 itself may be narrowed toward the downstream in the flow direction.

The spray nozzle 7 is a cooling device that is provided on the upper surface inside the flow path of the gas cooler 4 and sprays cooling water inside the flow path of the gas cooler 4.

During the operation of the geothermal power plant, the mixed gas discharged from the turbine is introduced into the condenser main body 2 from the exhaust duct 3. In the condenser main body 2, in the spray method, the cooling water sprayed by the spray is brought into contact with the mixed gas to condense the vapor, and in the tray method, the cooling water falling from the perforated plate tray is brought into contact with the mixed gas. Condenses the vapor. The condensed steam falls and is discharged from the bottom to the outside through the hot well at the bottom of the condenser main body 2.

The mixed gas cooled in the condenser main body 2 is introduced into the gas cooler 4. Here, in general, since the mixed gas of the vapor and the non-condensable gas is cooled to reduce the volume, the conventional gas cooler having a constant flow path area has a low flow velocity in the vicinity of the gas cooler outlet. When the flow rate is small, the stirring effect of the mixed gas and the cooling water from the spray nozzle 7 is lowered, and there is a possibility that the cooling becomes insufficient.

Therefore, in this embodiment, by reducing the steam flow path area toward the gas cooler outlet 5,
It is possible to flow the mixed gas to the gas cooler outlet 5 while suppressing the flow rate from being reduced, and to suppress a decrease in the cooling effect due to a decrease in the stirring effect.

(Second Embodiment)
Hereinafter, a condenser according to a second embodiment of the present invention will be described with reference to FIG. FIG. 3 shows a gas cooler of a condenser according to the first embodiment of the present invention, (a) is a schematic top sectional view,
(B) is a schematic cross-sectional view. The gas cooler 4 of the present embodiment has a configuration in which the baffles 8 are alternately installed in a direction perpendicular to the flow direction of the mixed gas to meander the flow of the mixed gas. Furthermore, it can be set as the structure which replaces the cooling device with the spray nozzle 7 and cools by dropping cooling water from the tray 9.

Since the mixed gas of the vapor and the non-condensable gas is cooled and the volume is reduced, the flow velocity is reduced toward the gas cooler outlet 5, and the stirring effect with the cooling water from the tray 9 by the mixed gas is reduced. Cooling may be insufficient. Therefore, in the present embodiment, the mixed gas is caused to meander and flow toward the gas cooler outlet 5 to lengthen the flow path, and the contact time with the cooling water is lengthened as compared with the case where the gas does not meander.

According to this embodiment, by installing the baffle 8 in the mixed gas flow path and causing the flow to meander, the contact time between the mixed gas and the cooling water can be lengthened and the cooling effect can be improved.

(Third embodiment)
Hereinafter, a condenser according to a third embodiment of the present invention will be described with reference to FIG. FIG. 4 shows the gas cooler of the condenser according to the first embodiment of the present invention, (a) is a schematic top sectional view,
(B) is a schematic cross-sectional view. In this embodiment, in the flow path of the gas cooler 4, the baffles 8 are alternately installed perpendicular to the flow direction of the mixed gas, and the installation interval of the baffles 8 is narrowed in the downstream direction of the flow.

According to the present embodiment, the flow path can be lengthened by meandering the mixed gas by the baffle 8 and the contact time with the cooling water can be lengthened. Furthermore, by shortening the space | interval of the baffle 8 toward the flow direction downstream, the fall of the flow velocity of mixed gas is suppressed and the cooling effect by the stirring effect of mixed gas and cooling water can also be maintained.

(Fourth embodiment)
Hereinafter, a condenser according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 5 shows a gas cooler of a condenser according to the first embodiment of the present invention, (a) is a schematic top sectional view,
(B) is a schematic cross-sectional view. In the present embodiment, the flow path forming member 6 is configured to reduce the flow path area of the steam toward the downstream side in the flow direction of the mixed gas of the gas cooler 4 and to alternately install the baffles 8 perpendicular to the flow direction.

According to the present embodiment, the flow path can be lengthened by meandering the mixed gas by the baffle 8 and the contact time with the cooling water can be lengthened. Further, by reducing the cross-sectional area of the flow path toward the downstream in the flow direction by the flow path forming member 6, the decrease in the flow velocity of the mixed gas is suppressed, and the cooling effect due to the stirring effect of the mixed gas and cooling water can be maintained. it can.

(Fifth embodiment)
Hereinafter, a condenser according to a fifth embodiment of the present invention will be described with reference to FIG. FIG. 6 shows a gas cooler of a condenser according to the first embodiment of the present invention, (a) is a schematic top sectional view,
(B) is a schematic cross-sectional view. In the present embodiment, the gas cooler 4 is provided with three types of cooling devices including a tray 9, a spray 7, and a filler 10 along the downstream side in the mixed gas flow direction.

In the mixed gas of steam and non-condensable gas, the steam flow rate decreases toward the gas cooler outlet. Therefore, the optimum cooling method is selected and arranged from the three types of cooling methods of the tray 9, the spray 7, and the filler 10 according to the amount of the mixed gas. Usually, the mixed gas of steam and non-condensable gas is cooled to reduce the volume, so that the flow velocity is reduced near the gas cooler outlet and cooling is not sufficiently performed.

In this embodiment, toward the gas cooler outlet 5, the tray 9 is disposed in the front and the spray 7 is disposed in the rear. Although the flow rate of the mixed gas decreases due to cooling by the tray 9, a high cooling effect can be obtained even at a reduced flow rate by cooling by the spray 7 having a cooling effect by fine water droplets. Further, by disposing the filler 10 at the rear, the cooling using the wet wall effect can provide a high cooling effect even if the flow rate is small.

(Sixth embodiment)
Hereinafter, a condenser according to a sixth embodiment of the present invention will be described with reference to FIG. FIG. 6 is a schematic cross-sectional view of the gas cooler of the condenser according to the first embodiment of the present invention. In the present embodiment, the interior of the gas cooler 4 is partitioned up and down by the tray 9 while leaving the end behind the flow path, so that the flow path is folded at the end through the lower part of the gas cooler 4 and passes through the upper part of the gas cooler 4. It is set as the structure returned to the main body trunk | body 2 direction.

The gas cooler outlet 5 is provided near the condenser main body 2 in the upper part of the gas cooler 4. Further, a spray 7 is provided on the upper surface of the gas cooler 4, and the cooling water sprayed by the spray 7 is accumulated under the spray 7 and dropped from the tray 9.

The mixed gas is introduced from the lower part of the gas cooler 4, folded back at the end, and discharged from the gas cooler outlet 5 through the upper part of the gas cooler 4. The mixed gas is cooled by the tray 9 below the gas cooler 4 and cooled by the spray 7 above the gas cooler 4 so that the contact time between the mixed gas and the cooling water is increased and heat exchange is performed efficiently. Can do.

Usually, since the mixed gas of steam and non-condensable gas is cooled and the volume is reduced, the flow velocity is reduced in the vicinity of the gas cooler outlet, and cooling is not sufficiently performed. There is a case. In the present embodiment, the cooling water is divided into two stages, the cooling water is reused by cooling with the spray 7 at the upper part and cooling with the tray 9 at the lower part, and the cooling effect can be enhanced.

Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions can be made without departing from the spirit of the invention.
Can be replaced or changed.

DESCRIPTION OF SYMBOLS 1 ... Condenser, 2 ... Condenser main body, 3 ... Exhaust duct, 4 ... Gas cooler, 5
... gas cooler outlet, 6 ... flow path forming member, 7 ... spray, 8 ... baffle,
9 ... Tray, 10 ... Filler

Claims (6)

A condenser body body that introduces the mixed gas from the exhaust duct and condenses the vapor in the mixed gas;
A gas cooler that is connected to a side surface of the condenser main body and that introduces a mixed gas in which steam is condensed in the condenser main body;
The gas cooler has a channel cross-sectional area that decreases in the downstream direction of the mixed gas flow, and is provided with a cooling device that cools the mixed gas in the channel. 2. The condenser according to claim 1, wherein a baffle for meandering a flow direction of the mixed gas is provided in a flow path of the gas cooler. The condenser according to claim 2, wherein the baffle is provided with a narrower interval in the downstream direction of the mixed gas flow. The condenser according to any one of claims 1 to 3, wherein a tray is provided in front of the flow path of the gas cooler and a spray is provided in the rear of the flow path. The condenser according to claim 4, wherein a filler is further provided behind the flow path of the spray. A condenser body body that introduces the mixed gas from the exhaust duct and condenses the vapor in the mixed gas;
A gas cooler that is connected to a side surface of the condenser main body and that introduces a mixed gas in which steam is condensed in the condenser main body;
A condenser, wherein the inside of the gas cooler is divided into upper and lower portions by leaving a rear end of the flow path by a tray, spray is provided on the upper surface of the gas cooler, and cooling water sprayed by the spray is dropped from the tray.

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