JP2000018846A - Deaeration condenser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accelerate the deaeration of the drain of a deaeration condenser even when the load and flow rate are low. SOLUTION: A deaeration condenser is provided with tube bundles 3a-3c which condense steam 2 discharged from a turbine by heat-exchanging the steam with fluids flowing in the bundles 3a-3c, a deaerator 14 which deaerates condensed drains 4 by spraying the drains 4 through the tube bundles 3a-3c, and a hot well 9 which recovers the sprayed drains 4. The deaerator is provided with a perforated plate and the quantity of water sprayed from the perforated plate is set in such a way that a water level can be formed in the deaerator 14 when the load and flow rate are low.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deaeration condenser installed in, for example, a steam turbine power plant, and more particularly to a deaeration condenser for promoting deaeration of drain condensed therein.

[0002]

2. Description of the Related Art FIG. 9 is a sectional view showing a conventional degassing condenser. As shown in FIG. 9, turbine exhaust steam 2 is introduced into a degassing condenser 1 in a steam turbine power plant, and the turbine exhaust steam 2 is sequentially arranged in the degassing condenser 1 from above. It is condensed by heat exchange with, for example, seawater flowing inside the tube bundle upper stage 3a, the tube bundle middle stage 3b, and the tube bundle lower stage 3c to become the drain 4.

The drain 4 condensed in the tube bundle upper stage 3a and the tube bundle middle stage 3b is collected in a sprinkling box 5 and then deaerated from the sprinkling box 5 via a deaeration tray 6 to fall on a hot well roof plate 7. On the other hand, the drain 4 condensed in the tube bundle lower stage 3c falls on the hot well roof plate 7 after passing through the watering shelf 8. Thereafter, the drain 4 is collected in the hot well 9 and returned from the condensate outlet pipe 10 into the system.

FIG. 10 is an explanatory diagram showing a deaeration tray in FIG. 9, and FIG. 11 is an explanatory diagram showing another deaeration tray in FIG. In the deaeration tray 6a shown in FIG. 10, the V-shaped tray is installed in multiple stages alternately in the vertical direction, while the deaeration tray 6b shown in FIG. It is installed in.

[0005]

However, in the above-described conventional degassing condenser 1, the degassing tray 6 shown in FIG.
a is a V-shaped tray, and a degassing tray 6b shown in FIG.
Is a pipe-shaped tray, the drain is effectively distributed only to a part of the deaeration tray 6a or 6b at a low load and at a low flow rate, and the fineness of the drain 4 is insufficient. As a result, the degassing of the drain 4 in the degassing condenser 1 was insufficient.

That is, in the conventional degassing condenser 1, since the degassing tray is a V-shaped tray or a pipe-shaped tray, water is unevenly sprayed, and the drain 4 at the time of partial load and low flow rate is discharged. There was a problem that degassing was insufficient.

The present invention has been made in view of the above circumstances, and has as its object to provide a deaeration condenser capable of promoting the deaeration of drain even at a low load and a low flow rate.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a first aspect of the present invention is a tube bundle for exchanging heat with a fluid flowing inside the turbine exhaust steam and condensing the same, and condensing through the tube bundle. A deaerator that sprinkles the drain that has drained and deaerates it,
In a degassing condenser having a hot well for collecting drain water sprinkled from the degassing device, a perforated plate is provided in the degassing device, and at a low load and a low flow rate, the water level in the degassing device is reduced. The amount of water sprayed from the perforated plate is set so as to be formed.

According to the first aspect of the present invention, the drain accumulates in the deaerator and forms a water level even at a low load or a low flow rate. The drain stored in the deaerator is evenly sprayed from the perforated plate. Therefore, the drain is sufficiently atomized even at low load and low flow rate, and the deaeration device is installed to prolong the time of flight to the hot well roof plate, thereby promoting vacuum deaeration. Can be.

According to a second aspect of the present invention, in the degassing condenser according to the first aspect, a dispersion member for receiving a drain falling from above and diverting the drain is provided in the deaerator. And

According to the second aspect of the present invention, in the deaerator,
By disposing a dispersion member that receives the drain falling from above, it is possible to prevent the drain from directly hitting the liquid surface formed in the deaerator and generate air bubbles, and also prevent the air bubbles from being entrained. In addition, since the drain is diffused by dividing the drain by the dispersion member, deaeration can be promoted.

According to a third aspect of the present invention, in the degassing condenser according to the first or second aspect, the drain in the lower stage of the tube bundle is recovered above the degassing device, and the drain is guided to the degassing device. A collection member is provided.

According to the third aspect of the present invention, the drain at the lower stage of the tube bundle is collected above the degassing device, and the drain collecting member for guiding the drain to the degassing device is provided, so that the condensed drain is removed. Of these, almost all the drain can be guided to the degassing device, so that degassing can be promoted.

According to a fourth aspect of the present invention, in the degassing condenser according to the third aspect, the drain recovery member has a drain outlet formed in a saw-tooth shape.

According to the fourth aspect of the present invention, since the drain outlet of the drain recovery member is formed in a saw-tooth shape, the drain surface area increases when the drain falls into the deaerator, so that the water spraying effect is further enhanced. Thus, deaeration can be promoted.

According to a fifth aspect of the present invention, there is provided the degassing condenser according to the first aspect, wherein a heating steam pipe for introducing heating steam is provided below the degassing device, and drainage is performed from the perforated plate of the degassing device. When the water drops, the drain is heated and degassed by the heated steam.

According to the fifth aspect of the present invention, by introducing the heating steam below the degassing device, the drain is heated and degassed in addition to vacuum degassing when falling from the degassing device. It can promote ki.

According to a sixth aspect of the present invention, there is provided a tube bundle for exchanging heat with a fluid flowing inward of a turbine exhaust steam and condensing the same, a partition device provided below the tube bundle and having an opening, and fixed to the opening. At the time of low load and at a low flow rate, a perforated plate having a water spray amount set so that a water level is formed in the partition device, a hot well for collecting drain water sprinkled from the perforated plate, and a lower part of the partition device And a heating steam pipe for introducing heating steam.

According to the invention of claim 6, the drain accumulates in the partitioning device, and forms a water level even at a low load or a low flow rate. The drain stored in the partitioning device is evenly sprayed from the perforated plate. Therefore, the drain can be sufficiently atomized even at low load and low flow rate, and the deaeration time to the hot well shingle due to the provision of the partitioning device can be extended to promote vacuum deaeration. it can.

Further, by introducing heating steam into the lower part of the partitioning device through the heating steam pipe, the drain falling from the perforated plate is heated and degassed in addition to vacuum degassing, so that degassing is promoted. Can be.

According to a seventh aspect of the present invention, there is provided the degassing condenser according to the sixth aspect, wherein the drain condensed through a tube bundle is sprayed and deaerated above the partitioning device to which the perforated plate is fixed. It is characterized by having been installed.

According to the seventh aspect of the present invention, the deaeration device for spraying the drain condensed through the tube bundle and deaeration is installed above the partition device to which the perforated plate is fixed, so that the deaeration can be further improved. Promotion can be aimed at.

[0023]

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

FIG. 1 is a sectional view showing a first embodiment of a deaeration condenser according to the present invention, FIG. 2 is an explanatory view showing the deaeration apparatus of FIG. 1, and FIG. FIG. 4 is a perspective view showing FIG.
5 is a perspective view showing the drain recovery member of FIG. 1, and FIG. 6 is a partial front view showing a drain outlet of the drain recovery member of FIG. Parts that are the same as or correspond to the conventional configuration will be described using the same reference numerals as in FIG.

As shown in FIG. 1, turbine exhaust steam 2 is introduced into a deaeration condenser 1a in a steam turbine power plant, and the upper tube bundle 3a,
A tube bundle middle stage 3b and a tube bundle lower stage 3c are arranged, and a fluid, for example, seawater, flowing inside the tube bundle upper stage 3a, the tube bundle middle stage 3b, and the tube bundle lower stage 3c exchanges heat with the turbine exhaust steam 2 so that the inside of the degassing condenser 1 is formed. Condenses the turbine exhaust steam 2 introduced into the turbine.

A sprinkler shelf 8 is provided below the lower tube bundle 3c, and a drain recovery member 12 is disposed below the sprinkler shelf 8 via a non-condensable gas flow channel 11, and a non-condensable gas flow channel is provided. Reference numeral 11 is connected to an air extraction device (not shown). An exhaust steam flow path 13 is formed vertically in the center of the tube bundle middle stage 3b and the tube bundle lower stage 3c, and a watering box 5 is provided at a lower exit side of the exhaust steam flow passage 13.

A degassing device 14 for degassing the drain 4 condensed through the tube bundle upper stage 3a, the tube bundle middle stage 3b and the tube bundle lower stage 3c is installed on the drain outlet side below the watering box 5. A hotwell shingle 7 is disposed below the device 14. A hot well 9 is installed below the hot well shingle 7, and a condensate outlet pipe 10 connected to a system is provided in the hot well 9.

As shown in FIGS. 2 and 3, the deaerator 14 is formed in a box shape as a whole, and has a frame plate 15 formed in a rectangular frame shape, and a perforated plate 16 forming a bottom plate of the frame plate 15. The perforated plate 16 is provided with a large number of outflow holes 16a, and the amount of water sprayed from these outflow holes 16a is such that the water level 17 is formed even at a low flow rate or a low drainage flow rate. And the size is set. As shown in FIGS. 3 and 4, a dispersion member 18 having an inverted V-shaped cross section is stretched over the frame plate 15 at predetermined intervals along the longitudinal direction.

The drain recovery member 12 is formed in a substantially U shape as shown in FIG.
6 and as shown in FIG.

Further, a heating steam pipe 19 is connected to a wall surface of the degassing condenser 1a below the degassing device 14, and heating steam is introduced into the degassing condenser 1a through the heating steam pipe 19. You. Therefore, the perforated plate 16 of the deaerator 14
When the drain 4 falls from the outflow hole 16a, the drain 4 is heated and degassed by the heating steam introduced through the heating steam pipe 19. Next, the operation of the first embodiment will be described.

As shown in FIG. 1, the turbine exhaust steam 2 is condensed into a drain 4 by heat exchange with, for example, seawater flowing through the upper tube bundle 3a, the middle tube bundle 3b and the lower tube bundle 3c in the degassing condenser 1a. . Tube bundle upper stage 3a and tube bundle middle stage 3
After the drain 4 condensed in b is collected in the watering box 5,
It is collected by the deaerator 14.

On the other hand, the drain 4 condensed in the tube bundle lower stage 3c
Is collected by the deaerator 14 via the drain collection member 12 after passing through the watering shelf 8. In this deaerator 14, as shown in FIG. 2, the amount of water sprayed from the outflow holes 16 a of the perforated plate 16 is set so that the water level 17 is formed even at a low load or a low flow rate. Water.

The drained water 4 is supplied to the deaeration condenser 1
In addition to the vacuum degassing by the degree of vacuum in
After being heated and degassed by the heated steam introduced from the hopper, it falls onto the hot well roof plate 7. Thereafter, the drain 4 is collected in the hot well 9 and returned from the condensate outlet pipe 10 into the system. The non-condensable gas that has passed through the exhaust steam flow path 13 passes through the non-condensable gas flow path 11 and is sucked by the air extraction device.

As described above, according to the first embodiment, the perforated plate 16 is provided in the deaerator 14 so as to reduce the load when the load is low and the flow rate is low.
The perforated plate 16 is formed so that the water level 17 is formed in the deaerator 14.
By setting the amount of water sprayed from the outflow hole 16a, the drain 4 accumulates in the deaerator 14 and the water level 17 is formed even at a low load or a low flow rate. Then, the drain 4 stored in the deaerator 14 is evenly sprayed from the many outflow holes 16a.

Here, when the load is low or the flow rate is low, the drain 4
Flows into only a part of the deaerator 14, but since the water level 17 is formed in the deaerator 14 according to the load and the flow rate, the drain 4 must be uniformly sprayed from the many outlet holes 16a. Can be.

Therefore, even when the load is low or the flow rate is low, the drain 4 is finely divided, and the provision of the deaerator 4 extends the time of flight to the hot-well shingle 7, and the vacuum Can promote qi.

Further, according to the first embodiment, as shown in FIGS. 3 and 4, the dispersion member 18 having an inverted V-shaped cross section is provided in the deaerator 14 so that the drain 4 can be removed. This prevents bubbles from being generated by directly hitting the surface of the water formed in the air device 14, and prevents the bubbles from being entrained. In addition, by dividing the drain 4 by the dispersion member 18, the drain 4 can be dispersed and introduced to the left and right.

Further, the drain 4 of the lower tube bundle 3c is collected above the degassing device 14, and the drain collecting member 12 for guiding the drain 4 to the degassing device 14 is installed. Can be led to the deaerator 14, so that deaeration can be promoted. The drain recovery member 12 has a drain outflow portion 12a formed in a sawtooth shape as shown in FIGS. This increases the drain surface area when the drain 4 falls, so that the water sprinkling effect is further enhanced and deaeration can be promoted.

Also, a heating steam pipe 19 for introducing heating steam below the degassing device 14 is provided on the wall surface of the degassing condenser 1a.
6 is heated and degassed in addition to vacuum degassing when falling from the outflow hole 16a of No. 6, so that degassing can be further promoted.

FIG. 7 is a sectional view showing a second embodiment of the degassing condenser according to the present invention, and FIGS. 8A and 8B are a plan view and a sectional view showing a perforated plate of the partitioning device of FIG. FIG. The same parts as those in the first embodiment will be described with the same reference numerals.

As shown in FIG. 7, the turbine exhaust steam 2 is introduced into the degassing condenser 1b in the steam turbine power plant as in the first embodiment, and the tube bundle upper stage 3a, 3a, A tube bundle middle stage 3b and a tube bundle lower stage 3c are arranged, and a fluid, for example, seawater, flowing inside the tube bundle upper stage 3a, the tube bundle middle stage 3b, and the tube bundle lower stage 3c exchanges heat with the turbine exhaust steam 2 so that the inside of the degassing condenser 1 is formed. Condenses the turbine exhaust steam 2 introduced into the turbine.

A sprinkler shelf 8 is provided below the lower tube bundle 3c, and a non-condensable gas channel 11 is provided below the sprinkler shelf 8. The non-condensable gas channel 11 is provided with an air extraction (not shown). Connected to the device. An exhaust steam flow path 13 is formed vertically in the center of the tube bundle middle stage 3b and the tube bundle lower stage 3c, and a watering box 5 is provided at a lower exit side of the exhaust steam flow passage 13.

Further, below the watering box 5, an upper tube bundle 3 is provided.
a, a partition device 20 for collecting the drain 4 condensed through the middle tube bundle 3b and the bottom tube bundle 3c is provided, and a hot well roof plate 7 is provided below the partition device 20. A hot well 9 is installed below the hot well shingle 7, and a condensate outlet pipe 10 connected to a system is provided in the hot well 9.

Further, a heating steam pipe 19 is connected to a wall surface of the degassing condenser 1b below the partitioning device 20, and heating steam is introduced into the degassing condenser 1b through the heating steam pipe 19. .

As shown in FIGS. 8A and 8B, the partitioning device 20 is a drain outlet below the watering box 5 and has a rectangular opening along the longitudinal direction of the degassing condenser 1b. A plurality of perforated plates 22 are connected and fixed to the lower surface of the partitioning device 20 near the opening 21 by welding so as to cover the opening 21. These perforated plates 22 are provided with a large number of outflow holes 22a.
The number and size of the water spray amount from a are set so that the water level 17 is formed even at a low flow rate or a low drain flow rate.

Next, the operation of the second embodiment will be described.

As shown in FIG. 7, the turbine exhaust steam 2 is condensed into a drain 4 by heat exchange with, for example, seawater flowing through the upper tube bundle 3a, the middle tube bundle 3b and the lower tube bundle 3c in the degassing condenser 1b. . Tube bundle upper stage 3a and tube bundle middle stage 3
After the drain 4 condensed in b is collected in the watering box 5,
Collected in the partitioning device 20.

On the other hand, the drain 4 condensed in the lower stage 3c of the tube bundle
Is collected by the partitioning device 20 after passing through the watering shelf 8. A plurality of perforated plates 22 are installed in the partitioning device 20,
The water level 17 is formed by the balance between the amount of water sprayed from the outflow holes 22a of the perforated plate 22 and the flow rate of the drain, and the drain 4 is evenly sprayed from the many outflow holes 22a even at a low load or a low flow rate. The sprinkled drain 4 is vacuum-degassed by the degree of vacuum in the degassing condenser 1b, and is also heated and degassed by the heating steam of the heating steam pipe 19, and then falls onto the hot well roof plate 7. Thereafter, the drain 4 is collected in the hot well 9 and returned from the condensate outlet pipe 10 into the system.

Although the perforated plate 22 is fixed to the lower surface of the partitioning device 20 in the second embodiment, the same operation and effect can be obtained by fixing it to the upper surface.

As described above, according to the second embodiment, a rectangular opening 21 is formed along the longitudinal direction of the degassing condenser 1b, and a number of perforated plates 22 are formed so as to cover the opening 21. Connected and fixed, partitioning device 2 at low load and low flow rate
0 so that a water level is formed at zero.
The drain 4 accumulates in the partitioning device 20 due to the setting of the amount of water sprayed from the water, and the water level 17 is formed even when the load is low or the flow rate is low. The drain 4 stored in the partition device 20 is evenly sprayed from the perforated plate 22.

Therefore, even when the load is low or the flow rate is low, the drain 4 is sufficiently atomized, and the evacuating time to the hot well roof plate 7 due to the provision of the partition device 20 is extended, so that the vacuum degassing is performed. Can promote qi.

Further, the partitioning device 2 is passed through the heating steam pipe 19.
0 by introducing heated steam into the lower part of the perforated plate 2
The drain 4 that falls from 2 is heated and degassed and vacuum degassed, so that degassing can be promoted.

The present invention is not limited to the above embodiments, and various changes can be made. For example, the tube bundles 3a to 3a are located above the partitioning device 20 to which the perforated plate 22 is fixed.
A deaerator 14 for spraying and draining the drain 4 condensed via c may be provided, and the first and second embodiments may be combined.

That is, the deaerator 14 of the first embodiment is installed on the drain outlet side below the watering box 5, and the perforated plate 22 of the second embodiment is fixed to the drain outlet of the deaerator 14. If the device 20 is installed, the deaeration can be further promoted. In this case, the heating steam pipe 19 is attached to the wall surface of the degassing condenser 1b below the partition device 20, as in the second embodiment.

[0055]

As described above, according to the first aspect of the present invention,
According to the present invention, a perforated plate is provided in a deaerator for spraying and draining condensed drain through a tube bundle, and at a low load and at a low flow rate, a water level is formed in the deaerator so that a water level is formed in the deaerator. By setting the amount of water sprayed, water is evenly sprayed from the perforated plate, so that deaeration can be promoted by making the drain finer.

According to the second aspect of the present invention, in the deaerator,
By installing a dispersion member that receives the drain falling from above, it is possible to prevent air bubbles from being trapped in the water level by the drain that has fallen into the deaerator, and the drain is diffused by dividing the drain by the dispersion member. Therefore, deaeration can be promoted.

According to the third aspect of the present invention, the drain at the lower stage of the tube bundle is collected above the degassing device, and the drain collecting member for guiding the drain to the degassing device is installed, so that the drainage condensed is reduced. Since almost all the drain can be recovered by the deaerator, the deaeration can be promoted.

According to the fourth aspect of the present invention, since the drain outlet of the drain recovery member is formed in a saw-tooth shape, the drain surface area increases when the drain falls into the deaerator, so that the water spraying effect is further enhanced. Thus, deaeration can be promoted.

According to the fifth aspect of the present invention, by introducing the heating steam below the degassing device, the drain is heated and degassed in addition to vacuum degassing when falling from the degassing device. It can promote ki.

According to the sixth aspect of the present invention, in addition to the effect of the first aspect, by introducing the heating steam to the lower part of the partitioning device through the heating steam pipe, the drain falling from the perforated plate is added to the vacuum degassing. Since heating and degassing are performed, degassing can be promoted.

According to the seventh aspect of the present invention, the deaeration device for spraying and draining the drain condensed through the tube bundle is installed above the partition device to which the perforated plate is fixed, so that the deaeration can be further improved. Promotion can be aimed at.

[Brief description of the drawings]

FIG. 1 is a sectional configuration view showing a first embodiment of a degassing condenser according to the present invention.

FIG. 2 is an explanatory view showing the deaerator of FIG.

FIG. 3 is a perspective view showing the deaerator of FIG. 1;

FIG. 4 is a sectional view showing the dispersion member of FIG. 3;

FIG. 5 is a perspective view showing a drain recovery member of FIG. 1;

FIG. 6 is a partial front view showing a drain outlet of the drain recovery member of FIG. 5;

FIG. 7 is a sectional configuration view showing a second embodiment of the degassing condenser according to the present invention.

8A and 8B are a plan view and a sectional view showing a perforated plate of the partitioning device of FIG.

FIG. 9 is a sectional configuration view showing a conventional degassing condenser.

FIG. 10 is an explanatory view showing a degassing tray in FIG. 9;

FIG. 11 is an explanatory view showing another deaeration tray in FIG. 9;

[Explanation of symbols]

 Reference Signs List 1a Degassing condenser 1b Degassing condenser 2 Turbine exhaust steam 3a Upper tube bundle 3b Middle tube bundle 3c Lower tube bundle 4 Drain 5 Watering box 7 Hotwell roof plate 8 Watering shelf 9 Hotwell 10 Water condensing outlet pipe 11 Non-condensable Gas flow passage 12 Drain recovery member 12a Drain outflow portion 13 Exhaust steam flow passage 14 Deaerator 15 Frame plate 16 Perforated plate 16a Outflow hole 17 Water level 18 Dispersion member 19 Heated steam pipe 20 Partition device 21 Opening 22 Perforated plate 22a Outflow hole

Claims (7)

[Claims] 1. A tube bundle for exchanging heat with a fluid flowing inward of a turbine exhaust steam and condensing the same, a degassing device for spraying and draining the condensed drain through the tube bundle, and a degassing device for spraying water from the degassing device. A dewatering condenser having a hot well for collecting drainage, wherein a perforated plate is provided in the degassing device, and at a low load and a low flow rate, the perforated plate is formed so that a water level is formed in the degassing device. A degassing condenser characterized by setting the amount of water sprayed from the plate. 2. The degassing condenser according to claim 1, further comprising a dispersion member for receiving a drain falling from above and diverting the drain in the degassing device. Water bowl. 3. The degassing condenser according to claim 1, wherein a drain at a lower stage of the tube bundle is collected above the degassing device, and a drain collecting member for guiding the drain to the degassing device is provided. A degassing condenser characterized by the following. 4. The degas condenser according to claim 3, wherein the drain recovery member has a drain outlet formed in a saw-tooth shape. 5. The degassing condenser according to claim 1, further comprising: a heating steam pipe for introducing heating steam below the degassing device, wherein when the drain falls from the perforated plate of the degassing device,
A degassing condenser wherein the drain is heated and degassed with the heating steam. 6. A tube bundle for exchanging heat with the fluid flowing inward of the turbine exhaust steam and condensing the same, a partition device installed below the tube bundle and having an opening formed therein, At the time of low flow rate, a perforated plate having a water spray amount set so that a water level is formed in the partition device, a hot well for collecting drain water sprinkled from the perforated plate, and a heating steam introduced into a lower portion of the partition device A degassing condenser comprising a heated steam pipe. 7. The degassing condenser according to claim 6, wherein a degassing device is installed above the partitioning device to which the perforated plate is fixed to spray and drain the condensed drain through a tube bundle. Characterized degassing condenser.