JP2016133233A - Flush box and condenser including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flush box which allows inflow of a drain, which is a high energy fluid, without causing troubles by using a simple structure.SOLUTION: A flush box 10 according to an embodiment is provided so as to be located adjacent to a condenser body 101 of a condenser 100, which condenses steam discharged from a steam turbine in its internal space, and flushes heater drain introduced thereinto. The flush box 10 includes: a box body 11; a drain introduction part 12 which is disposed at an internal space of the box body 11 and introduces the heater drain into the internal space of the box body 11; and a heat shielding member 14 disposed between the box body 11 and the drain introduction part 12.SELECTED DRAWING: Figure 4

Description

  Embodiments described herein relate generally to a flash box and a condenser including the same.

  In thermal power plants and nuclear power plants where steam turbines are installed, condensers are generally provided. A condenser is a device that condenses steam discharged from a steam turbine with cooling water to form condensed water. The condensed water condensed by such a condenser is generally sent to a heater and heated, and then supplied to a boiler. Thereafter, the condensate is further heated by the boiler into steam. Thereafter, the vaporized vapor from the condensate is supplied again to the steam turbine to rotate the steam turbine.

  In general, a part of the turbine steam supplied to the steam turbine is supplied as extracted steam to the heater in the system as described above, and this extracted steam is used for heating the condensate. The extracted steam supplied to the heater becomes a liquid by being condensed after the condensate is heated. This liquid is generally called a heater drain. When such a heater drain is generated, the heater drain may flow into the condenser. Also, in a thermal power plant, drain from the boiler may flow into the condenser.

  It is known that the heater drain as described above contains a large amount of dissolved oxygen. When the heater drain is mixed with the condensate while containing a large amount of such dissolved oxygen, corrosion may occur in each device in the system due to the dissolved oxygen. For this reason, the condenser may be provided with a flash box in order to deaerate dissolved oxygen contained in the heater drain. In the flash box, the saturation temperature of the internal space is lower than the temperature of the heater drain, and the high-temperature and high-pressure heater drain can be expanded in the internal space. Thereby, the vapor | steam containing dissolved oxygen (flash vapor | steam) can be discharge | released from a heater drain, and it can deaerate. That is, the heater drain can be flushed (evaporated), and dissolved oxygen can be released from the heater drain together with the steam. Such a flash box is generally provided separately from a condenser housing (condenser main body) for condensing turbine steam, and is provided on an outer wall surface of the condenser main body. . Further, in the condenser, there is a case where the drain is caused to flow into the condenser main body after the drain from the boiler is caused to flow into the flash box. In this case, the flash box lowers the temperature of the hot drain and flows it into the condenser body. This prevents damage such as thermal deformation of the condenser body. In addition, the drain from a heater drain and a boiler may flow in into a flash box.

  As a technique related to the flash box, for example, a configuration in which a reverse concave heater drain flow path is provided in the flash box is known. According to this configuration, it is possible to improve the efficiency of deaeration.

Japanese Patent No. 5197602

  By the way, high-temperature drain (hereinafter referred to as drain) from a heater drain or boiler is a high-energy fluid and is high-temperature and high-pressure. Therefore, when the flash box is applied to a condenser, if the drain flows into the flash box at a high temperature, the temperature of the flash box casing rises, resulting in thermal stress on the casing and damage. There is a problem that can occur.

  As a countermeasure for solving such a problem, for example, a configuration in which the temperature of the drain is reduced by a temperature reducer provided separately from the condenser and the flash box and then flows into the flash box can be employed. However, this configuration has a problem that the configuration and arrangement of the system can be complicated by securing the space for installing the temperature reducer, installing the piping for cooling water supplied to the temperature reducer, and the like.

  The present invention has been made in view of such circumstances, and provides a flash box capable of allowing inflow of drain which is a high energy fluid with a simple structure and without any trouble, and a condenser having the same. With the goal.

  The flash box according to the embodiment is a flash box that is provided adjacent to the condenser main body of the condenser that condenses the steam discharged from the steam turbine in its internal space, and flushes the introduced drain. . The flash box is disposed in a box body, an interior space of the box body, a drain introduction portion for introducing the drain into the interior space of the box body, and a space between the box body and the drain introduction portion. And a heat shielding member.

  Further, the condenser according to the embodiment is a condenser main body that condenses the steam discharged from the steam turbine in its internal space, and the flash box provided adjacent to the condenser main body, It has.

It is a schematic system diagram of an example of a power generation system in which a condenser having a flash box according to the first embodiment is installed. It is a top view of a condenser provided with the flash box by a 1st embodiment. It is sectional drawing which follows the III-III line of FIG. (A) is sectional drawing of the flash box enclosed by Z area | region shown by FIG. 3, (B) is sectional drawing of the flash box which follows the IV-IV line | wire of FIG. 4 (A), (C ) Is a diagram showing a cross-sectional shape of a heat shield member provided in the flash box. It is sectional drawing explaining 2nd Embodiment, (A) is sectional drawing of the flash box by 2nd Embodiment corresponding to Z area | region shown by FIG. 3, (B) is a figure. It is sectional drawing of the flash box which follows the VV line of 5 (A). It is sectional drawing explaining 3rd Embodiment, (A) is sectional drawing of the flash box by 3rd Embodiment corresponding to Z area | region shown by FIG. 3, (B) is a figure. It is sectional drawing which follows the VI-VI line of 6 (A). It is sectional drawing explaining 4th Embodiment, and is sectional drawing of the flash box by 4th Embodiment corresponding to Z area | region shown by FIG. It is sectional drawing explaining 5th Embodiment, and is sectional drawing of the flash box by 5th Embodiment corresponding to Z area | region shown by FIG. (A), (B) is a figure explaining the modification of 5th Embodiment. It is a figure explaining the modification of the heat insulation member of 1st thru | or 5th Embodiment.

  Embodiments will be described below in detail with reference to the accompanying drawings.

(First embodiment)
FIG. 1 shows a schematic system diagram of an example of a power generation system in which a condenser 100 including the flash box 10 according to the first embodiment is installed. In the power generation system shown in FIG. 1, the turbine steam S <b> 1 is supplied to the steam turbine 1, so that the steam turbine 1 rotates and the rotation of the steam turbine 1 is transmitted to the generator 3 via the rotating shaft 2. As a result, the generator 3 is rotated to generate power.

  In such a power generation system, as an example, the condenser 100 according to the present embodiment is installed in order to condense the exhaust steam S2 discharged from the steam turbine 1 with cooling water into the condensed water W. As shown in FIG. 1, a condenser 100 according to the present embodiment includes a condenser body 101 and a flash box 10, and in the illustrated power generation system, the condenser body 101 among them. Exhaust steam S2 flows into the tank. Here, the condenser main body 101 means a casing portion that forms an internal space in which the exhaust steam S2 from the steam turbine 1 flows in and condenses.

  In the illustrated power generation system, the condensate W condensed in the condenser main body 101 flows into the heater 4, and a part of the turbine steam S 1 supplied to the steam turbine 1 is extracted into the heater 4. The steam S3 is supplied. In the heater 4, the extracted steam S3 is used for heating the condensate W, and the extracted steam S3 is condensed after the condensate W is heated, so that the heater drain D which is a liquid is obtained. In this example, the flash box 10 is installed to degas and discharge dissolved oxygen contained in the heater drain D discharged from the heater 4.

  Hereinafter, the condenser 100 including the flash box 10 according to the present embodiment will be described in detail. 2 shows a top view of the condenser 100, and FIG. 3 shows a cross-sectional view taken along line III-III in FIG. In FIG. 3, a cross section of the flash box 10 is schematically shown for convenience of explanation.

  As shown in FIGS. 2 and 3, the condenser 100 according to the present embodiment includes the condenser main body 101 and the flash box 10 described above, and the flash box 10 includes the condenser main body 101. Are provided adjacent to each other. The condenser body 101 is provided with a water chamber 102. The water chamber 102 supplies cooling water for cooling the exhaust steam S <b> 2 (see FIG. 1) flowing into the condenser main body 101 to a later-described narrow tube group 103 disposed in the condenser main body 101. At the same time, it is a member for discharging cooling water that has passed through the thin tube group 103. Details of the water chamber 102 and the thin tube group 103 will be described later.

  The condenser main body 101 of the present embodiment has an upper part 101U disposed on the upper side and a lower side part 101D connected to the lower part of the upper part 101U. Of these, the upper part 101U is A flow path for passing the exhaust steam S2 discharged from the steam turbine 1 toward the lower side portion 101D is formed. The lower side portion 101D forms an internal space for condensing the exhaust vapor S2 that has passed through the upper side portion 101U.

  The lower side portion 101D has a rectangular shape in a cross sectional view and is formed in a box shape extending in the vertical direction. Specifically, the lower portion 101D has a pair of first wall portions 111A that face each other and extend along each other, and a pair of second wall portions 111B that face each other and extend along each other. One end of the pair of first wall portions 111A is connected by one of the pair of second wall portions 111B, and the other end of the pair of first wall portions 111A is paired with the pair of second wall portions 111B. Are connected by the other of them.

  The water chamber 102 described above is provided on the outer wall surface of the pair of first wall portions 111A in the lower side portion 101D, and the water chamber 102 includes the inflow side water chamber 102A and the outflow side water chamber 102B. Have. Among these, the inflow side water chamber 102A is provided on one outer wall surface of the pair of first wall portions 111A, and the outflow side water chamber 102B is formed on the other outer wall surface of the pair of first wall portions 111A. Is provided. The inflow side water chamber 102A and the outflow side water chamber 102B are arranged so as to face each other with the lower side portion 101D interposed therebetween. In the present embodiment, two sets of such water chambers 102 are provided on the outer wall surfaces of the pair of first wall portions 111A as an example.

  FIG. 3 schematically shows the above-described narrow tube group 103 disposed in the condenser main body 101. The narrow tube group 103 is constructed between the inflow side water chamber 102A and the outflow side water chamber 102B, and is disposed so as to penetrate the lower side portion 101D. In the water chamber 102, the cooling water flowing into the inflow side water chamber 102 </ b> A is supplied to the thin tube group 103. In addition, the outflow side water chamber 102 </ b> B discharges the cooling water that has passed through the thin tube group 103.

  Thereby, in the condenser main body 101, it is possible to make the condensate W by cooling and condensing the exhaust steam S2 flowing into the internal space of the lower side portion 101D with the cooling water passing through the narrow tube group 103. It has become. In addition, seawater is generally used as the cooling water that passes through the narrow tube group 111C, but other cooling water may be used.

  On the other hand, in the present embodiment, the flash box 10 is provided adjacent to each of the outer wall surfaces of the pair of second wall portions 111B in the lower side portion 101D. 2 and 3, reference numeral 104 denotes a plurality of pipes 104 through which the heater drain D discharged from the heater 4 shown in FIG. 1 flows into the flash box 10. These pipes 104 are connected to a drain pipe 13 (see FIG. 4) having a drain introducing portion 12 described later provided in the flash box 10. By supplying the heater drain D from the pipe 104 to the drain pipe 13, it is possible to introduce the heater drain D into the internal space of the flash box 10.

  Hereinafter, the flash box 10 will be described in detail.

  4A shows a detailed cross-sectional view of the flash box 10 surrounded by the Z region shown in FIG. 3, and FIG. 4B shows the flash box 10 taken along line IV-IV in FIG. 4A. FIG. FIG. 4C shows a cross-sectional shape of a heat shield member 14 to be described later provided in the flash box 10.

  As shown in FIGS. 4A and 4B, the flash box 10 of the present embodiment is disposed in the box body 11 and the internal space of the box body 11, and the heater drain D is introduced into the internal space of the box body 11. A drain pipe (drain member) 13 having a drain introducing portion 12 to be performed, and a heat shield member 14 disposed between the box body 11 and the drain introducing portion 12.

  The box body 11 of the present embodiment has a side wall 21 that has a rectangular shape in a cross-sectional view and extends in the vertical direction, a rectangular bottom wall 22 that closes the lower end of the side wall 21, and the side wall 21. And a rectangular top wall portion 23 that closes the upper end portion of the rectangular shape. Each of the side wall part 21, the bottom wall part 22, and the top wall part 23 is made of, for example, carbon steel.

  As shown in FIGS. 3 and 4A, the longitudinal cross-sectional shape of the box body 11 extends as a whole along the second wall portion 111B of the lower side portion 101D of the condenser body 101. It is formed in a rectangular shape. Moreover, with reference to FIG. 2, the cross-sectional shape of the side wall part 21 of the box main body 11 is a rectangular shape extended long along the 2nd wall part 111B of the lower side part 101D of the condenser main body 101. As shown in FIG. Is formed. Hereinafter, for convenience of explanation, in the cross-sectional view of the side wall part 21, the longitudinal direction in which the side wall part 21 extends in the long direction is referred to as the width direction, and the short direction perpendicular to the longitudinal direction of the side wall part 21 is the thickness direction. Call it.

  As shown in FIG. 4A, in the present embodiment, a plurality of reinforcing members 24 are provided across the wall portions facing in the thickness direction in the side wall portion 21. Thereby, the rigidity of the box body 11 is ensured. In the illustrated example, the reinforcing member 24 is made of a pipe material, and one end portion is joined to one of the wall portions opposed to each other in the thickness direction in the side wall portion 21, and the other end portion is joined to the side wall portion 21. Are joined to the other of the walls facing each other in the thickness direction.

  Specifically, as shown in FIG. 4B, the plurality of reinforcing members 24 are arranged so as to be lined up at intervals in the vertical direction and at intervals in the width direction of the side wall 21. More specifically, the columns of the reinforcing members 24 arranged in the vertical direction are positioned in parallel to the columns of the adjacent reinforcing members 24, and the rows of the reinforcing members 24 arranged in the width direction of the side wall 21 are adjacent to the reinforcing members. Located in parallel to 24 rows.

  A plurality of drain pipes 13 having the drain introduction part 12 of the present embodiment are provided so as to penetrate the side wall part 21 of the box body 11 from the outside, and each extends along the reinforcing member 24. Specifically, each drain pipe 13 passes through a wall portion opposite to the condenser main body 101 side among the wall portions facing in the thickness direction of the side wall portion 21 of the box main body 11. One end portion of the drain pipe 13 is exposed to the outside and is connected to the pipe 104 described above. Moreover, the other end part of the drain pipe 13 is joined to the inner wall surface of the wall part by the side of the condenser main body 101 among the wall parts facing in the thickness direction.

  As shown in FIG. 4B, the plurality of drain pipes 13 are arranged so as to be arranged at intervals in the vertical direction and at intervals in the width direction of the side wall 21. Specifically, the columns of the drain pipes 13 arranged in the vertical direction are positioned in parallel with the columns of the adjacent drain pipes 13, and the rows of the drain pipes 13 arranged in the width direction of the side wall 21 are adjacent to the adjacent drain pipes 13. It is located parallel to the line. Further, in the illustrated example, the drain pipe 13 is provided so as to be positioned between the reinforcing members 24 adjacent in the vertical direction.

  Further, the drain pipe 13 is disposed at a position where the drain introducing portion 12 is separated upward from the liquid level of the heater drain D when the heater drain D is stored on the bottom wall portion 22 side of the box body 11. This is because when the heater drain D is introduced from the drain introduction portion 12 of the drain pipe 13, the heater drain D is directly introduced into the heater drain D already stored on the bottom wall portion 22 side of the box body 11. This is because the steam containing the dissolved oxygen released from the heater drain D (flash steam) is difficult to be released from the heater drain D.

  And in this Embodiment, the drain introduction part 12 in the drain pipe 13 is provided in the intermediate part located between the both ends in the part inserted in the inside of the box main body 11 of the drain pipe 13. FIG. The drain introduction part 12 of the present embodiment is configured as an opening (hole) that opens downward, and a plurality of drain introduction parts 12 are formed in each drain pipe 13. Thereby, in this Embodiment, the heater drain D which flowed in from the one end part of the drain pipe | tube 13 and passed through the inside of the drain pipe | tube 13 is introduced toward the downward direction from the drain introduction part 12. FIG.

  Next, FIG. 4C shows a cross-sectional shape of the heat shield member 14 of the present embodiment. As shown in FIGS. 4 (A) to 4 (C), the heat shield member 14 of the present embodiment is formed so as to have a rectangular shape in a cross-sectional view and extend in the vertical direction, and has an upper end and a lower end. The part is open. The cross-sectional shape of the heat shield member 14 is formed in a rectangular shape that extends long along the second wall portion 111 </ b> B of the lower portion 101 </ b> D of the condenser main body 101. As in the case of the box body 11 described above, in the following, for convenience of explanation, in the cross-sectional view of the heat shield member 14, the longitudinal direction in which the heat shield member 14 extends in the long direction is referred to as the width direction, and the heat shield member 14 The short direction perpendicular to the longitudinal direction is called the thickness direction.

  The heat shield member 14 is provided so as to surround the drain introduction portion 12 from four directions in a cross-sectional view and to cover the entire side wall portion 21 of the box body 11 from the inside. Here, it is preferable that a gap of 50 mm or more is provided between the heat shield member 14 and the side wall portion 21 of the box body 11. The heat shield member 14 is made of carbon steel or the like, for example. As described above, the box body 11 is also formed of carbon steel or the like. However, as the material of the heat shield member 14, it is preferable to use a member having higher heat resistance than the material of the box body 11.

  Further, in the present embodiment, a plurality of through holes that penetrate the reinforcing member 24 and a plurality of through holes that penetrate the drain pipe 13 are formed in each of the wall portions facing in the thickness direction of the heat shield member 14. Is provided. The reinforcing member 24 and the drain pipe 13 pass through these through holes, and at least the reinforcing member 24 supports the load of the heat shield member 14. Thereby, the heat shield member 14 is fixedly supported by the reinforcing member 24.

  On the other hand, in the present embodiment, a degassing oxygen discharge unit 26 for discharging oxygen deaerated from the heater drain D containing dissolved oxygen introduced from the drain pipe 13 is provided on the upper side of the box body 11. Yes. Further, a drain discharge portion 27 for discharging the heater drain D introduced from the drain pipe 13 to the internal space of the condenser main body 101 is provided on the lower side of the box main body 11.

  The deaerated oxygen discharge unit 26 causes oxygen deaerated from the heater drain D to flow into the receiving unit 26 </ b> A disposed in the internal space of the box body 11 and discharges it to the gas phase part in the internal space of the condenser body 101. Further, the drain discharge portion 27 causes the heater drain D stored on the bottom wall portion 22 side of the box body 11 to flow into the receiving portion 27 </ b> A disposed in the internal space of the box body 11 to enter the internal space of the condenser body 101. Discharge. Here, when the heater drain D is stored on the bottom wall portion 22 side of the box body 11, the liquid level can reach the vicinity of the upper end of the receiving portion 27 </ b> A of the drain discharge portion 27. Therefore, the drain pipe 13 and the drain introduction part 12 are preferably arranged above the receiving part 27A of the drain discharge part 27.

  Next, the operation of the first embodiment having the configuration described above will be described.

  According to the condenser 100 according to the present embodiment, the exhaust steam S2 discharged from the steam turbine 1 flows into the condenser main body 101 when the power generation system shown in FIG. At this time, the exhaust steam S2 flowing into the internal space of the condenser main body 101 is condensed by the cooling water to become the condensate W. Condensate W condensed by the condenser main body 101 flows into the heater 4, and a part of the turbine steam S1 supplied to the steam turbine 1 is supplied to the heater 4 as extracted steam S3. . Then, the heater 4 heats the condensate W with the extracted steam S3. As a result, the extracted steam S3 is condensed after the condensate W is heated, so that the heater drain D that is a liquid is obtained. The heater drain D is introduced into the internal space of the flash box 10 from the drain introduction part 12 via the pipe 104 and the drain pipe 13.

  In the present embodiment, the heat drain member 14 is interposed between the drain introduction part 12 and the box body 11, so that the heater drain D introduced from the drain introduction part 12 is directly applied to the side wall part 21 of the box body 11. Contact is suppressed and introduced into the internal space of the box body 11. As a result, the temperature of the box body 11 rises due to the heat of the heater drain D and thermal stress is generated in the box body 11, or the heater drain D directly contacts the inner wall surface of the box body 11, thereby causing erosion. It can be prevented from occurring.

  And the heater drain D expand | swells in the internal space of the box main body 11, and discharge | releases the vapor | steam (flash vapor | steam) containing dissolved oxygen. The dissolved oxygen is degassed from the heater drain D by this steam. The deaerated oxygen floats upward and is discharged from the deaerated oxygen discharge unit 26. On the other hand, the heater drain D that has released the vapor containing dissolved oxygen falls downward and is stored on the bottom wall portion 22 side of the box body 11, and then discharged from the drain discharge portion 27 to the internal space of the condenser body 101. And mixed with the condensate W. Thereafter, the condensate W flows into the heater 4. Here, in the flash box 10, the heater drain D is cooled by dropping downward. Accordingly, the heater drain D can be discharged to the condenser main body 101 without hindering the condenser main body 101, that is, while suppressing the temperature rise of the condenser main body 101.

  According to the present embodiment as described above, in the flash box 10, the heater drain D introduced from the drain introduction portion 12 by interposing the heat shield member 14 between the drain introduction portion 12 and the box body 11. However, direct contact with the box body 11 is suppressed. Accordingly, the flash box 10 can allow the heater drain D, which is a high-energy fluid, to flow in with a simple structure without providing another temperature reducer or the like.

  Moreover, in this Embodiment, the flash box 10 is further provided with the reinforcement member 24 provided ranging between the wall parts which oppose in the box main body 11 (side wall part 21), and the thermal-insulation member 14 is a reinforcement member. 24 is fixedly supported. According to this, since the heat shield member 14 can be fixedly supported using a member for ensuring the rigidity of the flash box 10, the number of parts can be suppressed, and the installation of the heat shield member 14 becomes easy. .

  Moreover, in this Embodiment, the drain introduction part 12 is formed in the drain pipe 13 which is a drain member provided in the state which penetrates the wall part of the box main body 11, and the drain pipe 13 is extended along a reinforcement member. Yes. According to this, since the drain pipe 13 is arranged with high space efficiency in the internal space of the flash box 10, the drain introduction part 12 can be provided compactly without complicating as a result. Further, since the drain pipe 13 and the reinforcing member 24 are arranged along each other, they are prevented from interfering with each other during the assembly, and the assembly is facilitated.

  Moreover, in this Embodiment, the deaeration oxygen discharge part 26 is arrange | positioned at the upper side in the flash box 10 which is the side where the vapor | steam discharge | released from the heater drain D floats upwards. Thereby, the degassed oxygen discharge unit 26 efficiently discharges the degassed oxygen. Thereby, it is possible to prevent oxygen from remaining in the flash box 10.

  Moreover, in this Embodiment, the drain discharge part 27 is arrange | positioned at the lower part side of the flash box 10 which is the side where the heater drain D falls. Thereby, the heater drain D is efficiently discharged by the drain discharge portion 27. Thereby, the heater drain D can be efficiently merged with the condensate W.

(Second Embodiment)
Next, a flash box 10 according to a second embodiment will be described with reference to FIG. Of the constituent parts in the present embodiment, constituent parts similar to those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 5, the flash box 10 of the present embodiment includes a cooling medium introduction device 30 that introduces a cooling medium between the inner wall surface of the box body 11 and the outer wall surface of the heat shield member 14. . The cooling medium introduction device 30 of the present embodiment uses cooling air A as the cooling medium. As shown in FIG. 5A, in this example, the introduction position (supply position) of the air A of the cooling medium introduction device 30 is arranged on the lower side of the box body 11. A plurality of cooling medium discharge portions 31 for discharging the air A introduced from the cooling medium introduction device 30 are provided on the top wall portion 23 of the box body 11.

  Further, as shown in FIGS. 5A and 5B, in the present embodiment, the heat shield member 14 has a top wall portion 14A at its upper end portion and a bottom wall portion 14B at its lower end portion. However, it does not open upward and downward. Thus, the heater drain D introduced from the drain introduction part 12 is configured not to flow out of the heat shield member 14.

  In the present embodiment, the degassing oxygen discharge unit 26 passes through the box body 11 and the upper side of the heat shield member 14, and removes oxygen deaerated from the heater drain D from the internal space of the heat shield member 14. It comes to discharge. Moreover, the drain discharge part 27 of this Embodiment penetrates the box main body 11 and the lower side of the heat insulation member 14, and discharges the heater drain D from the internal space of the heat insulation member 14.

  According to the present embodiment, the same operations and effects as those of the first embodiment can be obtained, and the inner wall surface of the box body 11 and the outer wall surface of the heat shield member 14 can be obtained from the cooling medium introducing device 30. In the meantime, the cooling air A can be introduced, and the heat shield member 14 and the box body 11 can be cooled. As a result, it is possible to prevent a thermal stress from being generated in the heat shield member 14 by suppressing the temperature rise of the heat shield member 14. Moreover, the temperature rise of the box main body 11 can be suppressed, and it can prevent more reliably that a thermal stress arises in the box main body 11. FIG. Further, since the heater drain D can be cooled by the cooling air A, the heater drain D can be reliably discharged to the condenser main body 101 without any trouble.

  In the second embodiment, air A is used as the cooling medium, but cooling water may be used as the cooling medium introduced from the cooling medium introduction device 30. As the cooling water, condensate W condensed by the condenser main body 101, seawater, or other cooling water can be used. When the cooling water is used as the cooling medium, the heat shielding member 14 and the box body 11 can be cooled with a high heat transfer rate, so that the cooling effect can be improved. Further, when the condensate W is used as the cooling water, it is only necessary to extend the cooling water pipe from the condenser main body 101 or the like located at a relatively close position and connect it to the flash box 10. It can be prevented from becoming complicated. In addition, when seawater is used as the cooling water, a large amount of low-temperature cooling water can be easily secured, so that the cooling effect can be improved.

(Third embodiment)
Next, the condenser 100 provided with the flash box 10 according to the third embodiment will be described with reference to FIG. Of the constituent parts in the present embodiment, constituent parts similar to those in the first or second embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The flash box 10 of the present embodiment includes a cooling medium introducing device 30 that uses the condensate W condensed in the condenser main body 101 as cooling water. The cooling medium introducing device 30 is provided on the top wall portion 23 of the box body 11.

  Specifically, as shown in FIG. 6A, the configuration of the box body 11 and the heat shield member 14 of the present embodiment is the same as that of the first embodiment. In this case, between the inner wall surface of the box body 11 and the outer wall surface of the heat shield member 14, it extends in the vertical direction, and along the inner wall surface of the box body 11 and the outer wall surface of the heat shield member 14 in a cross-sectional view. An extended space is formed. Here, as shown in FIG. 6B, the cooling medium introducing device 30 of the present embodiment is in a space between the inner wall surface of the box body 11 and the outer wall surface of the heat shield member 14 in a cross-sectional view. It has a plurality of slit-like discharge holes 30A provided so as to be arranged along, and the cooling water is introduced downward along the vertical direction from the discharge holes 30A. Specifically, the cooling water is sprayed. The cooling water may be dropped from the discharge hole 30A without being sprayed.

  The discharge holes 30 </ b> A are arranged at a constant interval, for example, 100 mm, and the discharge holes 30 </ b> A are arranged vertically in the space between the inner wall surface of the box body 11 and the outer wall surface of the heat shield member 14. Opposite in direction. Further, as shown in FIG. 8B, the longitudinal direction of the slit-like discharge hole 30A is along the direction from the inner wall surface of the box body 11 toward the outer wall surface of the heat shield member 14 in the present embodiment. . One of the longitudinal ends of the discharge hole 30 </ b> A is close to the inner wall surface of the box body 11, and the other is close to the outer wall surface of the heat shield member 14. The longitudinal direction of the slit-shaped discharge hole 30A may be along other directions, for example, the inner wall surface of the box body 11 and the outer wall surface of the heat shield member 14 in a cross-sectional view.

  In the present embodiment, the cooling medium introducing device 30 as described above is provided on each of the one wall portion side and the other wall portion side in the thickness direction of the side wall portion 21 of the box body 11. In each of the cooling medium introducing devices 30 provided on the one wall portion side and the other wall portion side in the thickness direction of the side wall portion 21, the discharge hole 30 </ b> A extends along the width direction of the side wall portion 21 of the box body 11. Are lined up.

  Further, in the present embodiment, the degassing oxygen discharge unit 26 penetrates the upper side of the box body 11 and the heat shield member 14, and removes oxygen deaerated from the heater drain D from the internal space of the heat shield member 14. It comes to discharge. Moreover, the drain discharge part 27 of this Embodiment penetrates the lower part side of the box main body 11, and discharges the heater drain D from the internal space of the box main body 11. FIG. Here, in the present embodiment, the drain discharge unit 27 discharges the condensate W as the cooling water introduced by the cooling medium introduction device 30. As a result, the heater drain D is mixed with the condensate W in the internal space of the condenser main body 101. Therefore, when the cooling water is the condensate W, the problem does not occur even if it is mixed with the heater drain D. Absent.

  According to the present embodiment, the same operations and effects as those of the first embodiment can be obtained, and the inner wall surface of the box body 11 and the outer wall surface of the heat shield member 14 can be obtained from the cooling medium introducing device 30. During this period, cooling water can be introduced, and the heat shield member 14 and the box body 11 can be cooled.

  Further, the cooling medium introducing device 30 has a plurality of slit-like discharge holes 30 </ b> A provided so as to be arranged along a space between the inner wall surface of the box body 11 and the outer wall surface of the heat shield member 14 in a cross-sectional view. The cooling water is introduced downward from the discharge hole 30A. According to this, it becomes easy to supply cooling water to the heat shield member 14 and the box body 11 uniformly. That is, for example, when the cooling water is sprayed from the circular hole toward the space between the inner wall surface of the box body 11 and the outer wall surface of the heat shield member 14, Cooling water is locally injected on the inner wall surface and the outer wall surface of the heat shield member 14, and it becomes difficult to supply the cooling water to the inner wall surface of the box body 11 and the outer wall surface of the heat shield member 14, particularly on the lower side. On the other hand, when the cooling water is introduced from the plurality of slit-shaped discharge holes 30A, the directivity of the cooling water directed downward is higher than that of the circular hole, so that the cooling water is uniformly distributed in the box. It becomes easy to supply the inner wall surface of the main body 11 and the outer wall surface of the heat shield member 14. Further, even if the heat shield member 14 is open upward as in the present embodiment, the cooling water introduced from the cooling medium introducing device 30 is steam that is discharged from the heater drain D inside the heat shield member 14. Therefore, it is possible to prevent the vapor from becoming difficult to float upward.

  Further, in the present embodiment, the longitudinal direction of the slit-like discharge hole 30A is along the direction from the inner wall surface of the box body 11 to the outer wall surface of the heat shield member 14, and at both end portions of the discharge hole 30A in the longitudinal direction. One of them is close to the inner wall surface of the box body 11, and the other is close to the outer wall surface of the heat shield member 14. According to this, it is possible to easily supply the cooling water uniformly by the heat shield member 14 and the box body 11.

(Fourth embodiment)
Next, a flash box 10 according to a fourth embodiment will be described with reference to FIG. Of the constituent parts in the present embodiment, constituent parts similar to those in the first to third embodiments are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 7, the flash box 10 of the present embodiment includes a cooling medium introducing device 30 provided on the top wall portion 23 of the box body 11 as in the third embodiment. In the cooling medium introducing device 30 of the form, seawater is used as the cooling water. Therefore, the heat shield member 14 of the present embodiment has a top wall portion 14A at its upper end portion and a bottom wall portion 14B at its lower end portion, and is not open upward or downward.

  On the other hand, a cooling medium discharge portion 31 that discharges seawater that is cooling water introduced from the cooling medium introduction device 30 is provided on the bottom wall portion 22 side of the box body 11.

  According to the present embodiment, the same operation and effect as those of the third embodiment can be obtained, and a large amount of low-temperature cooling water can be easily secured by using seawater as the cooling water. Therefore, the cooling effect can be improved.

(Fifth embodiment)
Next, a flash box 10 according to a fifth embodiment will be described with reference to FIG. Of the constituent parts in the present embodiment, constituent parts similar to those in the first to fourth embodiments are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIG. 8, the flash box 10 of the present embodiment further includes a plurality of fins 40 that protrude outward from the outer wall surface of the box body 11. Other configurations are the same as those of the first embodiment. Although the fins 40 of the present embodiment are formed in a rod shape, they may be T-shaped or triangular as in the modification shown in FIGS.

  According to the present embodiment, the same operation and effect as the first embodiment can be obtained, and the surface area of the box body 11 is increased by the fins 40, so that the heat dissipation of the box body 11 is improved. improves. Thereby, the box main body 11 whose temperature has increased due to the influence of the heater drain D can be easily cooled, and the temperature increase of the box main body 11 can be suppressed. 9A and 9B can easily increase the surface area as compared with the rod shape, and thus it is easy to ensure the cooling performance. Such a fin 40 is also applicable to the second to fourth embodiments.

  FIG. 10 shows a modification common to the heat shield member 14 of the first to fifth embodiments. As shown in FIG. 10, the heat shield member 14 may be formed of a corrugated plate material. In this case, the heat dissipation performance is improved by increasing the surface area of the heat shield member 14, the heat shield member 14 that has risen in temperature due to the influence of the heater drain D is easily cooled, and the temperature rise of the heat shield member 14 is suppressed. be able to. Further, in the configuration in which the cooling medium is introduced as in the second to fourth embodiments, the amount of exchange heat is increased by increasing the contact area with the cooling medium, and the temperature of the heat shield member 14 is further increased. It is possible to suppress the heat of the heater drain D efficiently and improve the cooling effect.

  Although the embodiment of the present invention has been described above, the above embodiment is presented as an example, and is not intended to limit the scope of the invention. The novel embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  For example, the power generation system shown in FIG. 1 shows an example of a power generation system in which the condenser 100 including the flash box 10 according to each embodiment described above is installed. It goes without saying that the condenser 100 provided can be applied to a power generation system having a configuration different from that shown in FIG.

  In each of the above-described embodiments, the configuration in which the flash box 10 is supplied with the heater drain D from the heater 4 in the power generation system shown in FIG. 1 is described. High temperature drain, etc.). Further, in each of the above-described embodiments, the box body 11 of the flash box 10 has been described as having a rectangular structure in a cross-sectional view, but is not limited to such a shape. For example, the shape of the box body 11 in a cross-sectional view is substantially U-shaped, and the box body 11 has both ends of the substantially U-shape connected to the wall portion of the condenser body 101 to form a closed cross-sectional shape. The heat shield member 14 and the like may be disposed in the internal space having the closed cross-sectional shape.

DESCRIPTION OF SYMBOLS 10 Flash box 11 Box main body 12 Drain introduction part 13 Drain pipe 14 Heat insulation member 14A Top wall part 21 Side wall part 22 Bottom wall part 23 Top wall part 24 Reinforcement member 26 Deaeration oxygen discharge part 27 Drain discharge part 30 Cooling medium introduction apparatus 30A Discharge hole 31 Cooling medium discharge part 40 Fin 100 Condenser 101 Condenser body 101U Upper side part 101D Lower side part 102 Water chamber 102A Inflow side water chamber 102B Outflow side water chamber 103 Narrow tube group 104 Pipe 111A First wall part 111B Second wall S1 Turbine steam S2 Exhaust steam S3 Extracted steam W Condensate D Heater drain A Air

Claims (15)

A flush box provided adjacent to the condenser main body of the condenser for condensing the steam discharged from the steam turbine in its internal space, and flushing the introduced drain;
The box body,
A drain introduction part that is disposed in the internal space of the box body and introduces the drain into the internal space of the box body;
A flash box, comprising: a heat shield member disposed between the box body and the drain introduction part.   The flash box according to claim 1, further comprising a cooling medium introducing device for introducing a cooling medium between an inner wall surface of the box body and an outer wall surface of the heat shield member.   The flash box according to claim 2, wherein the cooling medium introduction device uses cooling air as the cooling medium.   The flash box according to claim 2, wherein the cooling medium introducing device uses cooling water as the cooling medium.   The flash box according to claim 4, wherein the cooling medium introducing device uses condensate condensed in the condenser main body as the cooling water.   The flash box according to claim 4, wherein the cooling medium introduction device uses seawater as the cooling water. A space extending in the vertical direction is formed between the inner wall surface of the box body and the outer wall surface of the heat shield member,
The cooling medium introducing device has a plurality of slit-like discharge holes provided so as to be aligned along a space between an inner wall surface of the box body and an outer wall surface of the heat shield member in a cross-sectional view. The flash box according to any one of claims 4 to 6, wherein the cooling water is introduced downward from the discharge hole. Further comprising a reinforcing member provided straddling between opposing wall portions in the box body,
The flash box according to claim 1, wherein the heat shield member is fixedly supported by the reinforcing member.   The said drain introduction part is formed in the drain member provided in the state which penetrates the wall part of the said box main body, The said drain member is extended along the said reinforcement member, It is characterized by the above-mentioned. Flash box.   The flash box according to claim 1, further comprising a fin protruding outward from an outer wall surface of the box body.   The flash box according to claim 10, wherein the fin has a rod shape, a T shape, or a triangular shape.   The flash box according to claim 1, wherein the heat shield member is formed of a corrugated plate material.   The degassing oxygen discharge part which discharges | emits the oxygen deaerated from the said drain which is arrange | positioned at the upper side and is introduce | transduced from the said drain introduction part is further provided. The flash box according to any one of 12 above.   The drain discharge part which is arrange | positioned at the lower part side and discharges the drain introduced from the drain introduction part to the internal space of the condenser main body is further provided. The flash box described in Crab.   A condenser main body for condensing steam discharged from the steam turbine in an internal space thereof, and the flash box according to any one of claims 1 to 14 provided adjacent to the condenser main body. A condenser characterized by comprising.

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