JP5457937B2 - Moisture separator heater - Google Patents

Description

  The present invention relates to a moisture separation heater, and more particularly to a moisture separation heater that prevents overcooling at the end of a heat transfer tube.

  In general, in a nuclear power plant, the steam that has finished work in a high-pressure turbine contains moisture of 10% or more by weight. This moisture is present in the form of water droplets in the steam or water adhering to the walls of the apparatus and piping. When the moisture in the steam increases, the moisture may collide with a wall surface of a device such as a turbine blade provided in the turbine, which may cause erosion erosion and damage the equipment. Further, in the low-pressure turbine, the higher the temperature of the steam sent to the low-pressure turbine, the higher the turbine efficiency.

  Therefore, in order to remove the steam that has finished work in the high-pressure turbine, that is, moisture in the exhaust of the high-pressure turbine, and further heat and send it as high-temperature steam to the low-pressure turbine, a heater is provided between the high-pressure turbine and the low-pressure turbine. Are installed in a cylindrical body (see, for example, Patent Document 1).

Hereinafter, a conventional moisture separation heater will be described.
In FIG. 5, the moisture separation heater 10 has a moisture separation module 12 disposed below the interior of a cylindrical body 11 formed in a cylindrical shape, a heater 13 disposed on the upper portion thereof, and the body. 11 is a body side steam inlet 22 for introducing high-pressure turbine exhaust to the side wall on the moisture separation module 12 side, which is the lower side wall of the heat exchanger 11, and high-temperature steam is supplied to the side wall on the U-shaped heat transfer tube 14 side, which is the upper side wall. Body side steam outlets 23 are provided for discharging.

  The moisture separation module 12 removes moisture in the high-pressure turbine exhaust, while the heater 13 heats (reheats) steam removed from the moisture by the moisture separation module 12. It is composed of a U-shaped heat transfer tube 14 and a heating steam header 15. The heating steam header 15 is internally partitioned into a heating steam inlet chamber 17 and a heating steam outlet chamber 18 by a partition plate 16, and both ends of the U-shaped heat transfer tube 14 are fixed to the tube plate 19 by welding or the like. In addition, it communicates with the heating steam inlet chamber 17 and the heating steam outlet chamber 18.

  The heating steam inlet chamber 17 and the heating steam outlet chamber 18 are configured to communicate with the heating steam inlet pipe 20 and the heating steam outlet pipe 21, respectively.

  In the moisture separation heater 10 configured as described above, the high-pressure turbine exhaust Si, which is the heated steam introduced from the body-side steam inlet 22, is moisture-separated by the moisture-separation module 12 and then the interior of the body 11. It is heated by heating steam such as high-pressure turbine bleed steam or reactor-generated steam that rises and flows through the U-shaped heat transfer tube 14, and is discharged from the body-side steam outlet 23 as heated (reheated) steam So. It flows into a low-pressure turbine through a pipe.

  The heated steam flowing into the U-shaped heat transfer tube 14 from the heated steam inlet chamber 17 is condensed in the process of exchanging heat with the high-pressure turbine exhaust flowing in the body 11 and sent to the heated steam outlet chamber 18. The moisture separated by the moisture separation module 12 is collected from the lower part of the body 11 to a drain tank (not shown).

FIG. 6 is also a conventional moisture separation heater that is generally used. FIG. 6 is different from FIG. 5 in that FIG. 5 has only one stage of the heater 13. If two stages (1 stage reheater 13 ₁ and 2-stage reheater 13 ₂₎ has, one step and reheater 13 ₁ of 1-reheat the heated steam outlet chamber 18 _1, 2-stage reheating vessel 13 by _two-stage reheating the heated steam inlet chamber 17 ₂ and the reheater connection pipe 24 to the point that has a structure which is connected in cascade.
In the case of FIG. 6, 20 is referred to as a first-stage reheat heating steam inlet pipe, and 21 is referred to as a two-stage reheat heating steam outlet pipe.

In FIG. 6, the high-pressure turbine exhaust Si that is the steam to be heated flows into the body 11 from the body 11 side steam inlet 22, and after being separated by the moisture separation module 12, the inside of the body 11 is raised to 2 Heated by heating steam such as high-pressure turbine bleed steam or reactor generated steam flowing in U-shaped heat transfer tubes (first-stage reheat heat transfer tubes 14 ₁ , two-stage reheat heat transfer tubes 14 ₂ ) arranged in stages. (Reheat) The steam So is discharged from the body-side steam outlet 32 and flows into the low-pressure turbine through a cross-around pipe (not shown).

1-reheat the heated steam inlet 20 through a single-stage reheating the heated steam inlet chamber 17 ₁ from U-shaped heat transfer tubes (1-reheat heat transfer tubes) 14 heating steam entering a _1, a high pressure turbine flowing through the body 11 condensed in the process of exhausting the heat exchange, and flows into the single-stage reheating the heated steam outlet chamber 18 _1. Thereafter, the high-pressure turbine via a reheater connection pipe 24 2-reheat the heated steam inlet chamber 17 ₂ from the U-shaped heat transfer tubes (2 reheat heat transfer tube) flows into the 14 ₂ similarly flows through the body 11 condensed in the course of the exhaust heat exchanger, 2-reheat the heated steam outlet chamber 18 ₂ to sent further flows out from the two-stage reheat the heated steam outlet 21.
The moisture separated by the moisture separation module 12 is collected from the lower portion of the body 11 to a drain tank (not shown) as in the case of FIG.

By the way, in the case of the conventional moisture separation heater shown in FIG. 5 and FIG. 6, the U-shaped heat transfer tube 14 constituting the heater (reheater), the _first- stage reheat heat transfer tube 14 ₁ , the two-stage reheat. the heating steam flowing heat transfer tube 14 in the ₂ to condense is cooled by the high pressure turbine exhaust heat exchange, condensed water during the condensation is the saturation temperature of the tube ideally, in practice the U-shaped In the vicinity of the outlets of the mold heat transfer tubes 14, 14 ₁ , 14 ₂ , a supercooling phenomenon occurs in which the temperature drops below the saturation temperature. Due to this supercooling phenomenon, the pressure in the heated steam outlet chamber 18, the _first- stage reheated heated steam outlet chamber 18 ₁ , and the second-stage reheated heated steam outlet chamber 18 ₂ is changed to the U-shaped heat transfer tube 14 and the first-stage reheated heat transfer tube 14. ₁ , 2 stage reheat tube 142 may be temporarily higher than the pressure at the outlet of ₂ , where condensate drainage may be difficult or other associated instabilities often occur.

  In order to solve the problem of this supercooling phenomenon, conventionally, an orifice is installed at the entrance and exit of the U-shaped heat transfer tube, and the flow rate of the steam introduced into each heat transfer tube is controlled to average the supercooling temperature of the condensed water, There has been proposed a method for reducing supercooling by securing vent steam in a U-shaped heat transfer tube (introducing more steam than necessary for heat exchange) (see, for example, Patent Documents 2 and 3).

JP-A-2-242001 Japanese Patent Publication No. 58-25925 U.S. Pat.No. 4,206,802

However, in the current situation, the methods described in Patent Documents 2 and 3 do not provide a sufficient overcooling prevention effect.
Accordingly, an object of the present invention is to provide a moisture separator / heater which is improved so as not to cause instability of the vent steam in the pipe resulting from the above-described supercooling of the pipe condensate.

  In order to achieve the above-mentioned object, the invention according to claim 1 is arranged such that a moisture separation module is disposed in the fuselage and is fixed on the upper side of the moisture separation module so that both ends communicate with the holes of the tube sheet. A heater having a heated U-shaped heat transfer tube and a heated steam header connected to the tube plate, a low-pressure steam inlet at the lower part of the fuselage, and a steam outlet at the upper part. In the separation / separation heater, a closed space is formed by airtightly covering the vicinity of the base of the U-shaped heat transfer tube to the tube plate with a covering member, and the closed space and the heating steam header are formed by a heating steam introduction pipe. The cover member is provided with a throttle means so that the closed space communicates with the heated steam circulation section side of the fuselage, and the end of the U-shaped heat transfer tube near the root of the tube plate is connected to the heated steam introduction tube. Flow Characterized by heating by steam.

  Further, the invention according to claim 2 is a U-shaped transmission in which a moisture separation module is disposed in the body, and both ends are fixed to the upper side of the moisture separation module so as to communicate with the holes of the tube sheet. In a moisture separation heater configured to dispose a heater having a heating steam header connected to a heat pipe and the tube plate, and further to provide a low-pressure steam inlet at a lower portion of the body and a steam outlet at an upper portion, A closed space is formed by airtightly covering the vicinity of the base of the U-shaped heat transfer tube to the tube plate with a covering member, and heating steam is introduced into the closed space from another system, and a pressure difference is applied to the covering member. The closed space is made to communicate with the heated steam circulation section side of the fuselage, and the end of the U-shaped heat transfer tube near the root of the tube plate is heated by steam from the other system. To heat And butterflies.

  According to the present invention, a process in which high-pressure turbine bleed gas flowing in a U-shaped heat transfer tube or heated steam such as main steam generated in a nuclear reactor is condensed by exchanging heat with high-pressure turbine exhaust that is heated steam flowing in the fuselage. Then, a part of the heating steam is used as vent steam so that the vicinity of the base of the U-shaped heat transfer tube to the tube plate at the start end and the end is heated from the outside, so that the U-shaped heat transfer tube The outer surface of the tube can be heated to reduce the temperature difference between the inside and outside of the U-shaped heat transfer tube. As a result, it is possible to obtain a moisture separation heater that prevents the occurrence of a supercooling phenomenon near the root of the tube plate.

The schematic diagram which shows the structure of the moisture separation heater which concerns on Embodiment 1 of this invention. The schematic diagram which shows the structure of the moisture separation heater which concerns on Embodiment 2 of this invention. The schematic diagram which shows the structure of the moisture separation heater which concerns on Embodiment 3 of this invention. The schematic diagram which shows the structure of the moisture separation heater which concerns on Embodiment 4 of this invention. The schematic diagram which shows the structure of the moisture separation heater of the prior art example 1. FIG. The schematic diagram which shows the structure of the moisture separation heater of the prior art example 2. FIG.

Hereinafter, embodiments of a moisture separation heater according to the present invention will be described with reference to the drawings.
[Embodiment 1]
FIG. 1 is an enlarged cross-sectional view showing a main part of a moisture separation heater 10 according to the first embodiment, and the omitted part has almost the same configuration as the moisture separation heater 10 shown in FIG. Yes.

  In FIG. 1, a moisture separation heater 10 has a moisture separation module 12 and a steam heater 13 arranged in order from the bottom to the top inside a horizontal body 11 formed in a cylindrical shape, Although not shown in FIG. 1, a trunk side steam inlet (22) is provided on the lower side wall of the fuselage 11, and a trunk side steam outlet (23) is provided on the upper side wall as shown in FIG. ing.

  One end portion (referred to as a start end portion for convenience) and the other end portion (referred to as a termination portion for convenience) of the U-shaped heat transfer tube 14 constituting the steam heater 13 communicate with a hole formed in the tube plate 19. In addition, the tube plate 19 is fixed by welding or the like. The start and end portions of the U-shaped heat transfer tube 14 communicate with a heating steam inlet chamber 17 and a heating steam outlet chamber 18 formed by a partition plate 16 in the heating steam header 15, respectively. The heating steam outlet chamber 18 is configured to communicate with the heating steam inlet pipe 20 and the heating steam outlet pipe 21, respectively.

  In the moisture separator / heater 10 configured as described above, the steam exhausted after finishing the work in the high-pressure turbine, that is, the high-pressure turbine exhaust flows into the body 11 from the body-side steam inlet (22) (not shown) and becomes moisture. After the moisture is separated by the separation module 12, it is heated by the heated steam flowing in the U-shaped heat transfer tube 14 of the heater 13, and flows into the low-pressure turbine from the trunk-side steam outlet (23) through a cross-around tube (not shown). It is like that.

  The heating steam flowing in the U-shaped heat transfer tube 14 is condensed in the process of heating the high-pressure turbine exhaust, and the moisture separated by the moisture separation module 12 is recovered from the lower part of the body 11 to a drain tank (not shown). This is the same as the moisture separation heater 10 shown in FIG.

  In the first embodiment, with respect to the conventional moisture separation heater 10 configured as described above, the root of the U-shaped heat transfer tube 14 and the end of the U-shaped heat transfer tube 14 and the root of the tube plate 19 and the vicinity thereof, The shield plate 25 and the shield plate 25 are arranged inside the body 11 by placing the shield plate 25 in an airtight state at a predetermined distance L from the tube plate 19 in a portion opposite to the heating steam header 15 when viewed from the tube plate 19. 25 forms a closed space 26. Here, the airtight state means that the U-shaped heat transfer tube 14 is hermetically processed so that steam does not leak from a hole penetrating the shielding plate 25, and the outer peripheral portion and the body of the shielding plate 25. 11 is that the joint with the inner wall is also hermetically processed. The shielding plate 25 may be referred to as a “covering member” because it covers the base of the U-shaped heat transfer tube 14 and the tube plate 19 and the vicinity thereof.

Furthermore, the closed space 26 is communicated with the heating steam inlet chamber 17 of the heating steam header 15 by heating steam introduction pipe 27 ₁ newly provided, the fuselage by the orifice pipe 28 provided in a part of the shielding plate 25 11 It communicates with a section 11A through which high-pressure turbine exhaust flows. The diameter of the orifice pipe 28 is selected so that the internal pressure of the closed space 26 is higher than the pressure on the section 11A side of the body 11, so that the orifice pipe 28 has a "throttle means" 28 for creating a pressure difference. Sometimes called.

Most of the heating steam in the heating steam inlet chamber 17 flows from the start end to the end in the U-shaped heat transfer tube 14, and in this process, the moisture-separated steam is heated and condensed. The remaining portion of the vapor (vent steam) is led into the closed space 26 through the heating steam inlet pipe 27 _1, the base and its vicinity of the U-shaped heat transfer tubes 14 to tube sheet 19 flows as indicated by the arrow After the start and end portions are heated, they are discharged from the orifice pipe 28 to the section 11A through which the high-pressure turbine exhaust in the body 11 flows.

Incidentally, the diameter of the heating steam inlet pipe 27 ₁ is that it is appropriately selected so as to require to prevent supercooling at the ends of the U-shaped heat transfer tubes 14 through which a sufficient amount of heating steam is needless to say Yes.

  As described above, the moisture separator / heater according to the first embodiment is heated by the high-pressure turbine bleed gas flowing in the U-shaped heat transfer tube 14 or the heated steam such as main steam generated in the nuclear reactor in the fuselage 11. In the process of condensation by exchanging heat with the high-pressure turbine exhaust, which is steam, a part of the heating steam is used as vent steam, and the root of the U-shaped heat transfer tube 14 near the root of the tube plate 19 and Since the side portion is configured to be heated from the outside, the outer surface of the U-shaped heat transfer tube 14 can be heated to reduce the temperature difference between the inside and the outside of the U-shaped heat transfer tube 14. And the occurrence of the supercooling phenomenon in the vicinity thereof can be prevented.

  It should be noted that the vent steam flowing into the closed space 26 is introduced from elsewhere, or the orifice pipe 28 is changed to a structure that causes other pressure loss, and the vent steam flowing into the closed space 26 is discharged to another system. Of course, the same effect as in the case of FIG. 1 can be obtained.

[Embodiment 2]
Next, Embodiment 2 will be described with reference to FIG.
FIG. 2 is an enlarged cross-sectional view showing a main part of the moisture separation heater 10 according to the second embodiment, and the omitted part has the same configuration as the moisture separation heater shown in FIG.

The difference between the moisture separation heater 10 shown in FIG. 2 and the moisture separation heater 10 shown in FIG. 1 is a portion for collecting vent steam. That is, in the case of FIG. 1, has been configured to direct vent steam into the closed space 26 by the heating steam inlet pipe 27 ₁ for communicating the heating steam inlet chamber 17 formed in the heating steam header 15 and the closed space 26 , the second embodiment shown in FIG. 2, which is constituted to direct vent steam into the closed space 26 by the heating steam inlet pipe 27 ₁ for communicating the heating steam outlet chamber 18 and the closed space 26.
Other configurations, operations, and effects are the same as those of the first embodiment shown in FIG.

[Embodiment 3]
Next, Embodiment 3 will be described with reference to FIG.
FIG. 3 is an enlarged cross-sectional view showing the main part of the moisture separation heater 30 according to the third embodiment, and the omitted part has the same configuration as the moisture separation heater 30 shown in FIG.

In FIG. 3, the moisture separation heater 30 of the third embodiment includes the moisture separation module 12 and the first inside the horizontal cylindrical body 11 formed as shown in FIG. 1 steam heater 13 _1, and a second steam heating device 13 ₂ are successively disposed, also, although not shown in FIG. 3, in the lower sidewall of the body 11 as in the conventional 6 fuselage A side steam inlet (22) is provided, and a body side steam outlet (23) is provided on the upper side wall.

Beginning and end of the U-shaped heat transfer tubes 14 ₁ forming the first steam heater 13 ₁ is fixed by welding or the like to the tube sheet 19 to the hole and communicating drilled in each tube plate 19 ing. Then, beginning and end of the U-shaped heat transfer tubes 14 _1, in the heating steam header 15 ₁ formed by a partition plate 16 ₁ 1-reheat the heated steam inlet chamber 17 ₁ and 1-reheat the heated steam outlet Each of the chambers 18 ₁ communicates with each other, and the first-stage reheat heating steam inlet chamber 17 ₁ is configured to communicate with the first-stage reheat heating steam inlet pipe 20.

Similarly, welding starting end and the terminal end of the U-shaped heat transfer tubes 14 ₂ constituting the second steam heater 13 _2, with respect to the tube plate 19 to the hole and communicating drilled in each tube plate 19 It is fixed with. Then, beginning and end of the U-shaped heat transfer tubes 14 _2, formed by the partition plates 16 ₂ in the heating steam header 15 ₂ 2-reheat the heated steam inlet chamber 17 ₂ and 2-reheat the heated steam outlet It is configured to respectively communicate with the chamber 18 _2.

Further 2-reheat the heated steam inlet chamber 17 _2, the is configured to communicate via a reheater connection pipe 24 with respect to single-stage reheating the heated steam outlet chamber 18 _1, 2-reheat the heated steam outlet chamber 18 ₂ is configured to communicate with two-stage reheat the heated steam outlet 21. As a result, between the single-stage reheating the heated steam inlet pipe 20 and the two-stage reheat the heated steam outlet 21, the heater ₁₃ 1, 13 ₂ of the U-shaped heat transfer tubes ₁₄ 1, 14 ₂ are connected in a cascade .

In the moisture separation heater 30 configured as described above, the high-pressure turbine exhaust flows into the body 11 from a body-side steam inlet (22) (not shown) and is separated by the moisture separation module 12, and then the first is separated. and flows into the low pressure turbine (not shown) from the body-side vapor outlet is heated (23) by heating the steam flowing through the U-shaped heat transfer tubes 14 in ₁ constituting the steam heater 13 _1. Heated steam such as high-pressure turbine bleed air flowing in the U-shaped heat transfer tubes 14 ₁ and 14 ₂ or main steam generated in the nuclear reactor is condensed in the process of heating the high-pressure turbine exhaust and separated by the moisture separation module 12. The moisture is recovered from the lower portion of the body 11 to a drain tank (not shown) in the same manner as the moisture separation heater 30 shown in FIG.

In the third embodiment, the roots of the U-shaped heat transfer tubes 14 ₁ and 14 _{2 at} the start and end portions of the tube plate 19 and the conventional moisture separation heater 30 configured as described above are described. By placing the shielding plate 25 in an airtight state at a predetermined distance L from the tube plate 19 in the vicinity, that is, the portion opposite to the heated steam header 15 when viewed from the tube plate 19, the tube plate is placed inside the body 11. A closed space 26 is formed by 19 and the shielding plate 25. Here, the airtight state is the same as in the first embodiment, and the U-shaped heat transfer tubes 14 ₁ and 14 ₂ are processed to be airtight so that steam does not leak from the holes that penetrate the shielding plate 25. This means that the joint between the outer peripheral portion of the shielding plate 25 and the inner wall of the body 11 is also airtightly processed. The shielding plate 25 is sometimes referred to as a covering member because it covers the root of the end of the U-shaped heat transfer tube 14 to the tube plate 19 and the vicinity thereof.

Moreover, the closed space 26, as well as ₁ and communicating the one-reheat the heated steam inlet chamber 17 by the first heating steam inlet tube 27 _1, the 2-stage reheat heat through the second heating steam inlet pipe 27 ₂ It communicates with the steam inlet chamber 172, and further communicates with a section 11 </ _b > A through which high-pressure turbine exhaust in the body 11 flows by an orifice pipe 28 provided in a part of the shielding plate 25. Also in the case of the third embodiment, the diameter of the orifice pipe 28 is selected so that the internal pressure of the closed space 26 is higher than the pressure on the section 11A side of the body 11, so that the orifice pipe 28 creates a pressure difference. For this reason, it may be referred to as “squeezing means” 28.

Most of the heating steam first stage reheat the heated steam inlet chamber 17 ₁ flows toward the end of the U-shaped heat transfer tubes 14 ₁ from the beginning, condensed by heating the moisture of the separated steam in the process To do. The remaining portion of the vapor (vent steam) is led into the closed space 26 through the first heating steam inlet tube 27 _1, the base and the starting end of the U-shaped heat transfer tubes 14 ₁ in the vicinity of the tube plate 19 and After the end portion is heated, it is discharged to the section 11A through which the high-pressure turbine exhaust in the body 11 flows through the orifice pipe 28.

Similarly, most of the heating steam second stage reheat the heated steam inlet chamber 17 within ₂ flows toward the end of the U-shaped heat transfer tubes 14 within ₂ from the starting, the moisture of the separated steam in the process Heat to condense. The remaining portion of the vapor (vent steam) is led into the closed space 26 through the second heating steam inlet pipe 27 _2, the base and the starting end of the U-shaped heat transfer tubes 14 ₂ in the vicinity of the tube plate 19 After the end portion is heated, the high-pressure turbine exhaust in the body 11 flows through the orifice pipe 28 and is discharged to the section 11A.

The first diameter of the heating steam inlet pipe 27 ₁ and the second heating steam inlet pipe 27 _2, a sufficient amount in the necessary to prevent excessive cooling at the end of the U-shaped heat transfer tubes 14 _1, 14 ₂ Needless to say, the heating steam is appropriately selected so as to flow.

As described above, in the moisture separator / heater according to the third embodiment, heated steam such as high-pressure turbine bleed gas flowing in the U-shaped heat transfer tubes 14 ₁ and 14 ₂ or main steam generated in the nuclear reactor is contained in the body 11. In the process of exchanging heat with the high-pressure turbine exhaust, which is the heated steam flowing through the water, and condensing, a part of the heated steam is used as vent steam and the root of the tube plate 19 and the U-shaped heat transfer tube 14 _{1 in the} vicinity thereof , 14 ₂ is configured to be heated from the outside, so that the outer surfaces of the U-shaped heat transfer tubes 14 ₁ , 14 ₂ can be heated to reduce the temperature difference between the inside and outside of the tube, and as a result Further, it is possible to prevent the occurrence of the supercooling phenomenon at the root of the tube plate 19 and the vicinity thereof.

  It should be noted that the vent steam flowing into the closed space 26 is introduced from elsewhere, or the orifice pipe 28 is changed to a structure that causes other pressure loss, or the vent steam flowing into the closed space 26 is discharged to another system. Of course, the same effect as in the case of FIG. 3 can be obtained.

[Embodiment 4]
Next, Embodiment 4 will be described with reference to FIG.
FIG. 4 is an enlarged cross-sectional view showing the main part of the moisture separation heater 30 according to the fourth embodiment, and the omitted part has the same configuration as the moisture separation heater shown in FIG.

The difference between the moisture separation heater 30 shown in FIG. 4 and the moisture separation heater 30 shown in FIG. 3 is a portion for collecting vent steam. That is, in the case of FIG. 3, formed in the heating steam header 15 1-reheat the heated steam inlet chamber 17 ₁ and the closed space 26 and the communication is one-stage heating steam introduction pipe 27 ₁ and 2-stage reheat the heated steam inlet chamber 17 ₂ and has been configured to direct vent steam into the closed space 26 by the closed spaces 26 and two-stage heating steam inlet pipe 27 ₂ for communicating, the embodiment 4 shown in FIG. 4, single-stage reheating The first heating steam introduction pipe 27 ₁ that communicates the heating steam outlet chamber 18 ₁ and the closed space 26, and the second heating steam introduction pipe 27 ₂ that communicates the two-stage reheat heating steam outlet chamber 18 ₂ and the closed space 26. Each of them is configured to guide the vent steam into the closed space 26.
Other configurations, operations, and effects are the same as those of the third embodiment shown in FIG.

10, 30 ... moisture separator heater, 11 ... body, sections of flow of 11A ... high pressure turbine exhaust, 12 ... moisture separator module, 13, 13 _1, 13 2 _... steam heater, 14, 14 _1, 14 ₂ ... U-shaped heat transfer tube, 15 ... heating steam header, 16, 16 ₁ , 16 ₂ ... partition plate, 17 ... heating steam inlet chamber, 17 ₁ , 17 ₂ ... 1st stage, 2 stage reheat heating steam inlet chamber, 18 ... Heated steam outlet chamber, 18 ₁ , 18 ₂ ... 1st stage, 2nd stage reheated heating steam outlet chamber, 19 ... Tube plate, 20 ... Heated steam inlet pipe or 1st stage reheated heated steam inlet pipe, 21 ... Heated steam outlet pipe or 2-stage reheat heating steam outlet pipe, 22 ... body 11 side steam inlet, 23 ... body 11 side steam outlet, 24 ... reheater connection pipe, 25 ... shield plate, 26 ... closed _space, 27 1, 27 ₂ ... Heated steam inlet pipe, 28 ... orifice pipe (throttle creating pressure difference Stage).

Claims (6)

A moisture separation module is arranged in the fuselage, and a U-shaped heat transfer tube fixed at both ends of the moisture separation module so as to communicate with holes of the tube plate and heating connected to the tube plate In a moisture separation heater configured to dispose a heater having a steam header, and further to provide a low-pressure steam inlet at the lower part of the fuselage and a steam outlet at the upper part,
A closed space is formed by airtightly covering the root of the U-shaped heat transfer tube to the tube plate and the vicinity thereof with a covering member, and the closed space and the heating steam header are communicated with each other by a heating steam introduction pipe. A throttle means for creating a pressure difference is provided in the covering member to connect the closed space to the heated steam flow section side of the body, and the root of the U-shaped heat transfer tube to the tube plate and its vicinity Is heated by steam flowing through the heating steam introduction pipe. A moisture separation module is arranged in the fuselage, and a U-shaped heat transfer tube fixed at both ends of the moisture separation module so as to communicate with holes of the tube plate and heating connected to the tube plate In a moisture separation heater configured to dispose a heater having a steam header, and further to provide a low-pressure steam inlet at the lower part of the fuselage and a steam outlet at the upper part,
A closed space is formed by airtightly covering the root of the U-shaped heat transfer tube to the tube plate and the vicinity thereof with a covering member, and heating steam is introduced into the closed space from another system, and the covering member A throttle means for creating a pressure difference is provided to communicate the closed space with the heated steam circulation section side of the fuselage, and the tube plate root of the U-shaped heat transfer tube and its vicinity are from the other system. A moisture separation heater characterized by heating with heating steam.   The moisture separating heater according to claim 1 or 2, wherein the covering member is constituted by a shielding plate provided at an appropriate distance from the tube plate.   3. The moisture separation heating according to claim 1, wherein the covering member is configured to cover at least an end portion of the U-shaped heat transfer tube on a side connected to a steam outlet chamber of a heating steam header. vessel.   The moisture separation heater according to claim 1 or 2, wherein the throttle means for creating the pressure difference is an orifice pipe.   6. The heater according to claim 1, wherein a plurality of heaters are arranged on the upper side of the moisture separation module, and the U-shaped heat transfer tubes of the heaters of the respective stages are connected to the cascade by a connecting pipe. 2. The moisture separator / heater according to item 1.

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