JP2014052161A - Condenser and complex condenser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit the pressure loss of the turbine exhaust exhausted from a steam turbine and introduced into a condenser and thereby inhibit the deterioration of the condensation rate and the deterioration of the recovery efficiency of condensed water even when a water supply heater and a strength reinforcement member etc. are densely arranged in a condenser connected with the steam turbin, in particular, in an upper body.SOLUTION: A condenser is connected with a steam turbin and is used for condensing turbin exhaust steam exhausted from the steam turbin and obtaining condensed water. The condenser includes: an upper body; a lower body; and an airtight case member disposed in the upper body. At least a water supply superheater is disposed in the case member.

Description

  The present invention relates to a condenser and a composite condenser.

  Generally, in a steam turbine plant, a condenser is connected to the steam turbine, and turbine exhaust steam (hereinafter referred to as “turbine exhaust”) used to drive the turbine is discharged from the steam turbine and then condensed in the condenser. The thermal energy of the turbine exhaust is recovered to improve plant thermal efficiency.

  Usually, the condenser is composed of an upper body and a lower body, and a low-pressure feed water heater is disposed in the upper body so as to be orthogonal to the axial direction of the steam turbine and holds the low-pressure feed water heater. A reinforcing member and a truss for reinforcing the strength of the gantry and the upper body are disposed. Further, a plurality of heat transfer tubes are disposed in the lower body so as to be orthogonal to the axial direction of the steam turbine, thereby forming a so-called tube bundle.

  The feed water heater is a device for heating water supplied to the reactor core to a predetermined temperature in advance. In a steam turbine plant, the upper body of the condenser is generally used from the viewpoint of design. A part thereof is disposed inside.

  In the condenser configured as described above, the turbine exhaust discharged from the steam turbine is introduced into the upper body of the condenser, and then introduced into the lower body, and then flows through the heat transfer tubes constituting the tube bundle. Heat is exchanged with cooling water such as seawater to become condensate.

  On the other hand, in recent years, there is a tendency to increase the efficiency of turbine performance by increasing the size of a steam turbine in a steam turbine plant. As the steam turbine becomes larger and the turbine performance becomes more efficient, the condenser connected to the steam turbine needs to be densely arranged with the piping of the low-pressure feed water heater arranged in the upper body. In order to sufficiently improve the strength, it is necessary to closely arrange strength reinforcing members such as trusses.

  However, since the pipes and strength reinforcing members of the feed water heater described above act as obstacles to the introduced turbine exhaust, when the pipes and strength reinforcing members of the feed water heater are closely arranged, the turbine Exhaust gas is subjected to pressure loss when moving downward through gaps in the feed water heater piping and strength reinforcing members. As a result, the condensation rate in the tube bundle in the lower main body of the condenser decreases, and the recovery efficiency as condensate decreases.

  In order to cope with such a problem, a technique is disclosed in which a jacket is provided so as to cover a plurality of feed water heaters, and a turbine exhaust suction port is formed on the side of the jacket and a turbine exhaust discharge port is formed on the bottom. (Patent Document 1). However, in this technique, although disturbance and vortex flow due to the strength reinforcing member provided in the upper body of the condenser can be prevented, the turbine exhaust is introduced into the jacket from the turbine exhaust suction port, The pressure loss cannot be avoided because it passes through the gap of the feed water heater.

JP2003-14381A

  The problem to be solved by the present invention is that the condenser connected to the steam turbine, in particular, even when the feed water heater and the strength reinforcing member are densely arranged in the upper body, is discharged from the steam turbine, It is to suppress the pressure loss of the turbine exhaust introduced into the condenser, and to suppress the decrease of the condensation rate and the recovery efficiency as the condensate.

  One aspect of the present invention is a condenser connected to a steam turbine for condensing turbine exhaust steam discharged from the steam turbine to obtain condensate, the condenser including an upper body, The present invention relates to a condenser, comprising a lower body and an airtight case member disposed in the upper body, wherein at least a water supply superheater is disposed in the case member.

  According to the present invention, the condenser connected to the steam turbine, in particular, when the feed water heater and the strength reinforcing member are densely arranged in the upper body, is discharged from the steam turbine and is supplied to the condenser. The pressure loss of the introduced turbine exhaust can be suppressed, and the decrease in the condensation rate and the recovery efficiency as condensate can be suppressed.

It is sectional drawing which shows schematic structure of the condenser of 1st Embodiment. It is a top view which shows a structure below from the surface cut | disconnected along the II line | wire of the condenser shown in FIG. It is sectional drawing which shows schematic structure of the condenser of 2nd Embodiment. It is sectional drawing which shows schematic structure of the condenser of 3rd Embodiment. It is sectional drawing which shows schematic structure of the condenser of 4th Embodiment.

(First embodiment)
FIG.1 and FIG.2 is a figure which shows schematic structure of the condenser in this embodiment. FIG. 1 is a cross-sectional view showing a schematic configuration of the condenser of the present embodiment, and FIG. 2 is a plan view showing a configuration below the plane cut along the II line of the condenser shown in FIG. FIG.

  As shown in FIGS. 1 and 2, the condenser 11 of the present embodiment includes an upper body 12 and a lower body 13. In addition, a rectangular parallelepiped airtight case member 121 is disposed at the center of the upper body 12 in the width direction and above it. In the case member 121, the pedestals 123 are provided in a plurality of stages, and the water heater 122 is disposed on each pedestal 123. In the present embodiment, a truss 124 for reinforcing the strength of the upper main body 12 of the condenser 11 is also provided in the case member 121.

  In addition, the upper main body 12 of the condenser 11 is connected to the steam turbine 14, and the feed water heater 122 is arrange | positioned so as to be orthogonal to the axial direction.

  A plate-shaped reinforcing member 125 is disposed inside the upper body 12 of the condenser 11 and outside the case member 121.

  The feed water heater 122 is a device for heating water supplied to the reactor core to a predetermined temperature in advance. In a steam turbine plant, from the viewpoint of design, the water feed heater 122 is generally installed in the upper main body of the condenser. A part thereof is disposed on the surface. In the present embodiment, such a feed water heater 122 is disposed in the case member 121 disposed in the upper main body 12 of the condenser 11.

  A tube bundle 131 in which a plurality of heat transfer tubes are disposed is disposed in the lower main body 13 of the condenser 11.

  In addition, the condenser 11, the case member 121, the feed water heater 122, the mount 123, the truss 124, and the reinforcing member 125 can be made of carbon steel. In this case, turbine exhaust steam (hereinafter referred to as “turbine exhaust”) from the steam turbine 14 continuously flows in the condenser 11 during operation, and thus rust is generated on the surface of the condenser 11 and the like during the operation. It does not occur. However, when the operation is stopped, rust is generated on the surface of the condenser 11 and the like. Therefore, it is necessary to appropriately remove the rust generated on the surface of the condenser 11 and the like before the operation.

  Further, since the heat transfer tubes constituting the tube bundle 131 disposed in the lower main body 13 of the condenser 11 flow seawater or the like inside as described below, rust is likely to be generated inside the tubes. Accordingly, in order to suppress the occurrence of rust inside the tube, the heat transfer tube is made of, for example, titanium.

  Next, the operation of the condenser 11 shown in FIGS. 1 and 2 will be described. The arrows in the figure indicate the flow of turbine exhaust from the steam turbine 14.

  Turbine exhaust exhausted from the steam turbine 14 disposed on the upper portion of the condenser 11 is introduced into the upper body 12 of the condenser 11. Since an airtight case member 121 is disposed in the upper body 12, the turbine exhaust passes through the space S outside the case member 121 and is introduced into the lower body 13 as indicated by arrows in the figure. Is done. In the lower main body 13, for example, seawater or the like flows in a plurality of heat transfer tubes constituting the tube bundle 131, and is cooled by heat exchange with the introduced turbine exhaust to be condensed water.

  In this embodiment, conventionally, a feed water heater 122 and a truss 124 that cause a pressure loss of turbine exhaust discharged from the steam turbine 14 are arranged in an airtight case member 121, and the space S through which the turbine exhaust passes is provided. Does not provide the feed water heater 122 or the like. Therefore, even when the feed water heater 122 and the truss 124 are closely arranged, the pressure loss of the turbine exhaust in the upper body 12 of the condenser 11 is suppressed, and the turbine in the lower body 13 of the condenser 11 is suppressed. It is possible to suppress a decrease in exhaust condensation rate and a decrease in recovery efficiency as condensate.

  In this embodiment, since the airtight case member 121 is disposed in the upper main body 12 of the condenser 11, the case member 121 itself acts as a reinforcing member for the upper main body 12. Furthermore, since the reinforcing member 125 is provided, the strength of the upper body 12 of the condenser 11 can be further increased by the synergistic effect of the case member 121 and the reinforcing member 125.

(Second Embodiment)
FIG. 3 is a diagram showing a schematic configuration of the condenser in the present embodiment, and is a cross-sectional view corresponding to FIG. 1 of the first embodiment. Note that the same reference numerals are used for components similar or identical to those shown in FIGS. 1 and 2.

  In the condenser 11 according to the first embodiment, the case member 121 disposed in the upper main body 12 is formed in a rectangular parallelepiped shape, and thus a pair of opposite side walls are substantially parallel to each other. However, in the condenser 21 of the present embodiment, the pair of opposite side walls 121A of the case member 121 disposed in the upper main body 12 has a pair of side walls 121A from the upstream side to the downstream side of the turbine exhaust. The width defined by is narrowed. In addition, about another structure, since it is the same as that of the condenser 11 shown in 1st Embodiment, description is abbreviate | omitted.

  Also in this embodiment, conventionally, the feed water heater 122 and the truss 124 that cause the pressure loss of the turbine exhaust discharged from the steam turbine 14 are disposed in the airtight case member 121, and the space S through which the turbine exhaust passes is provided. Does not provide the feed water heater 122 or the like. Therefore, even when the feed water heater 122 and the truss 124 are closely arranged, the pressure loss of the turbine exhaust in the upper body 12 of the condenser 11 is suppressed, and the turbine in the lower body 13 of the condenser 11 is suppressed. It is possible to suppress a decrease in exhaust condensation rate and a decrease in recovery efficiency as condensate.

  Further, since the side wall 121A of the case member 121 is formed in a so-called taper shape from the upstream side to the downstream side of the turbine exhaust, pressure loss due to the turbine exhaust colliding with the side wall 121A of the case member 121 is reduced. Can be suppressed. Therefore, it is possible to more effectively suppress a decrease in the condensation rate of the turbine exhaust in the lower main body 13 of the condenser 11 and a decrease in the recovery efficiency as condensate.

  In addition, about another effect, it is the same as that of the condenser 11 of 1st Embodiment. That is, since the airtight case member 121 is disposed in the upper main body 12 of the condenser 21, the case member 121 itself acts as a reinforcing member for the upper main body 12. Furthermore, since the reinforcing member 125 is provided, the strength of the upper main body 12 of the condenser 11 can be further increased by a synergistic effect with the case member 121 and the reinforcing member 125.

(Third embodiment)
FIG. 4 is a diagram showing a schematic configuration of the composite condenser of the present embodiment, and is a cross-sectional view corresponding to FIG. 1 of the first embodiment. Note that the same reference numerals are used for components similar or identical to those shown in FIGS. 1 and 2.

  In the present embodiment, the three condensers 11 shown in the first embodiment are connected in parallel via the side wall 12A of the upper body 12 to constitute a composite condenser. That is, a part of the side wall 12A is notched and opened, and continuous bonding is performed through this opening. A steam turbine 14 is disposed above each of the three condensers 11. In addition, the number of the condensers in a composite condenser can be made into arbitrary numbers as needed.

  The configuration of each condenser 11 is the same as that shown in the first embodiment. However, as shown in FIG. 4, it is the same as that shown in the first embodiment in that a new space S ′ is formed at the joint portion (in the vicinity of the side wall 12 </ b> A) of the upper main body 12 of the adjacent condenser 11. Is different. In addition, about another structure, since it is the same as that of the condenser 11 shown in 1st Embodiment, description is abbreviate | omitted.

  Also in this embodiment, conventionally, the feed water heater 122 and the truss 124 that cause the pressure loss of the turbine exhaust discharged from the steam turbine 14 are disposed in the airtight case member 121, and the space S through which the turbine exhaust passes is provided. Does not provide the feed water heater 122 or the like. Therefore, even when the feed water heater 122 and the truss 124 are closely arranged, the pressure loss of the turbine exhaust in the upper body 12 of the condenser 11 is suppressed, and the turbine in the lower body 13 of the condenser 11 is suppressed. It is possible to suppress a decrease in exhaust condensation rate and a decrease in recovery efficiency as condensate.

  Further, since the three condensers 11 are joined to each other via the side wall 12A to form a composite condenser, the space S ′ is formed at the joint part of the adjacent condensers 11 as described above. It is formed. Accordingly, the turbine exhaust described above passes through the space S ′ in addition to the space S and is introduced into the lower main body 13 of the condenser 11. As apparent from FIG. 4, the space S ′ is sufficiently larger than the space S, so that the pressure loss can be significantly reduced when the turbine exhaust passes through the space S ′. For this reason, in the composite condenser according to the present embodiment, it is possible to more effectively suppress a decrease in the condensation rate of the turbine exhaust in the lower main body 13 of each condenser 11 and a decrease in the recovery efficiency as condensate. it can.

  In addition, about another effect, it is the same as that of the condenser 11 of 1st Embodiment. That is, since the airtight case member 121 is disposed in the upper main body 12 of the condenser 21, the case member 121 itself acts as a reinforcing member for the upper main body 12. Furthermore, since the reinforcing member 125 is provided, the strength of the upper body 12 of the condenser 11 can be further increased by the synergistic effect of the case member 121 and the reinforcing member 125.

  In the present embodiment, the case member 121 is formed in a rectangular parallelepiped shape so that a pair of opposite side walls are substantially parallel to each other. However, as shown in the second embodiment, the side wall of the case member 121 is It can be formed in a so-called taper shape from the upstream side to the downstream side of the turbine exhaust. In this case, pressure loss due to the turbine exhaust colliding with the side wall of the case member 121 can be suppressed. Therefore, it is possible to more effectively suppress the decrease in the condensation rate of the turbine exhaust and the decrease in the recovery efficiency as the condensate in the lower main body 13 of the composite condenser of the present embodiment.

(Fourth embodiment)
FIG. 5 is a diagram showing a schematic configuration of the composite condenser of the present embodiment, and is a cross-sectional view corresponding to FIG. 1 of the first embodiment. Note that the same reference numerals are used for components similar or identical to those shown in FIGS. 1 and 2.

  In the present embodiment, the three condensers 11 shown in the first embodiment are connected in parallel through a dense case member 121 having a rectangular parallelepiped shape disposed on the side of the upper main body 12, and combined with each other. Constructs a condenser. In this case, the case member 121 functions as a side wall at the joint portion of each condenser 11.

  In the case member 121, the pedestals 123 are arranged in three stages, and the water heater 122 is arranged on each pedestal 123. A truss 124 is disposed on the upper portion of the case member 121. However, the number of the pedestals 123 can be an arbitrary number as necessary. For example, the number of pedestals 123 can be two stages as in the first embodiment.

  A steam turbine 14 is disposed above each of the three condensers 11. In addition, the number of the condensers in a composite condenser can be made into arbitrary numbers as needed.

  Further, plate-like reinforcing members 125 are disposed at corners in the upper main body 12 of the condenser 11 located at the right end and the left end.

  In the composite condenser of the present embodiment, the case member 121 in which the feed water heater 122 and the like are accommodated is disposed at the joint portion of the condenser 11 and constitutes the side wall of the condenser 11. Therefore, the space S formed outside the case member 121 of each condenser 11 is larger than that of the condenser 11 in the first embodiment.

  As a result, the turbine exhaust described above passes through the enlarged space S of the composite condenser and is introduced into the lower main body 13 of each condenser 11. As described above, in the composite condenser of this embodiment, the space S of each condenser 11 is sufficiently larger than the space S of the condenser 11 of the first embodiment. When the turbine exhaust passes through the space S, the pressure loss can be greatly reduced. Therefore, it is possible to more effectively suppress the decrease in the condensation rate of the turbine exhaust and the decrease in the recovery efficiency as condensate in the lower main body 13 of each condenser 11 of the composite condenser.

  Moreover, in the composite condenser of this embodiment, since the case member 121 is arrange | positioned in the junction part of the adjacent condenser 11, the intensity | strength as the whole composite condenser can be increased.

  In the present embodiment, the case member 121 is formed in a rectangular parallelepiped shape so that a pair of opposite side walls are substantially parallel to each other. However, as shown in the second embodiment, the side wall of the case member 121 is removed from the turbine exhaust. From the upstream side to the downstream side, a so-called taper shape can be formed. In this case, pressure loss due to the turbine exhaust colliding with the side wall of the case member 121 can be suppressed. Therefore, it is possible to more effectively suppress the decrease in the condensation rate of the turbine exhaust and the decrease in the recovery efficiency as the condensate in the lower main body 13 of the composite condenser of the present embodiment.

  As mentioned above, although several embodiment of this invention was described, these embodiment was posted as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 11 Condenser 12 Upper body 121 (Condenser) Case member 122 Feed water heater 123 Base 124 Truss 125 Reinforcement member 13 Lower body 131 (Condenser) Pipe bundle 14 Steam turbine S, S 'space

Claims (5)

A condenser connected to a steam turbine for condensing turbine exhaust steam discharged from the steam turbine to obtain condensate,
The condenser comprises an upper body, a lower body, and an airtight case member disposed in the upper body,
The condenser is characterized in that at least a water supply superheater is disposed in the case member.   At least a pair of opposite side walls along the flow of the turbine exhaust steam of the case member are formed so that the width is narrowed from the upstream side to the downstream side of the turbine exhaust steam. The condenser according to claim 1, wherein A combined condenser having a plurality of condensers connected to each of the plurality of steam turbines for condensing turbine exhaust steam discharged from each of the plurality of steam turbines,
Each condenser includes an upper body, a lower body, and an airtight case member disposed in the upper body, and at least a water supply superheater is disposed in the case member,
The plurality of condensers are connected to each other at the side portions of the body plates. A combined condenser having a plurality of condensers connected to each of the plurality of steam turbines for condensing turbine exhaust steam discharged from each of the plurality of steam turbines,
Each condenser includes an upper main body and a lower main body, and the plurality of condensers are connected to each other via an airtight case member disposed on the side of the trunk plate,
A composite condenser having at least a water supply superheater disposed in the case member.   The pair of side walls facing each other along the flow of the turbine exhaust steam of the case member has a width defined by the pair of side walls narrowing from the upstream side to the downstream side of the turbine exhaust steam. The composite condenser according to claim 3 or 4, wherein the composite condenser is formed as described above.

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