US20100031656A1 - Condenser - Google Patents
Condenser Download PDFInfo
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- US20100031656A1 US20100031656A1 US12/579,800 US57980009A US2010031656A1 US 20100031656 A1 US20100031656 A1 US 20100031656A1 US 57980009 A US57980009 A US 57980009A US 2010031656 A1 US2010031656 A1 US 2010031656A1
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- United States
- Prior art keywords
- pressure side
- condenser
- high pressure
- low pressure
- hot well
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
- F28B1/02—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser using water or other liquid as the cooling medium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B7/00—Combinations of two or more condensers, e.g. provision of reserve condenser
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S165/00—Heat exchange
- Y10S165/184—Indirect-contact condenser
- Y10S165/192—Indirect-contact condenser including means to heat collected condensate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S261/00—Gas and liquid contact apparatus
- Y10S261/10—Steam heaters and condensers
Abstract
A condenser comprises a high pressure side condenser, a high pressure side cooling tube bank, a high pressure side hot well, a low pressure side condenser, a low pressure side cooling tube bank, a pressure shroud provided inside the low pressure side condenser, a low pressure side hot well, high pressure steam introducing portion, low pressure side condensate introducing portion, a flash box which communicates with at least one of the high pressure side hot well and the low pressure side hot well, flashes a heater drain from a feed water heater, and urges at least one of the high pressure side hot well and the low pressure side hot well to recover the flashed heater drain, and a flash steam path which introduces flash steam generated inside the flash box into at least one of the high pressure side hot well and the low pressure side hot well.
Description
- This is a Continuation Application of PCT Application No. PCT/JP2008/072433, filed Dec. 10, 2008, which was published under PCT Article 21(2) in Japanese.
- This application is based upon and claims the benefit of priority from prior Japanese Patent Application No. 2007-318632, filed Dec. 10, 2007, the entire contents of which are incorporated herein by reference.
- 1. Field of the Invention
- The present invention relates to a condenser condensing steam into condensate with cooling water.
- 2. Description of the Related Art
- A condenser applied to, for example, a nuclear power plant or a thermal power plant, condenses turbine exhaust steam which has ended an expansion work by steam turbine, into condensate, with cooling water. The cooling water used in such a condenser is sea water or fresh water from a cooling tower. The cooling water is made to flow in a heat-transfer pipe arranged in the condenser to exchange heat with the exhaust steam introduced into the condenser and condense the turbine exhaust steam.
- One of the types of condenser is a multistage pressure condenser which comprises a plurality of, i.e. two or three main body shells (i.e. a plurality of condensers) and in which pipes are serially arranged such that the cooling water pass through each of the main body shells at a plurality of times. In the main body shell of the multistage pressure condenser which is arranged on a slip stream side of the flow path of the cooling water, vacuum in the main body shell becomes lower due to rise of cooling water temperature. For this reason, the pressure of the turbine exhaust steam introduced into the main body shell arranged at the slip stream side of the flow path of the cooling water becomes higher.
- Temperature of the condensate condensed in the condenser becomes a saturation temperature which substantially corresponds to the turbine exhaust pressure introduced into the main body shell of the condenser. Thus, in the multistage pressure condenser in which the main body shells are different in pressure, condensate temperatures of the multistage pressure condenser having, for example, three types of pressures in the main body shells are higher in order of a high pressure condenser, an intermediate pressure condenser and a low pressure condenser.
- Since the condensate generated in the condenser is supplied again to the system as feed water, a higher temperature of the condensate is desirable in terms of heat efficiency. In the above-described three-shell multistage pressure condenser, it is preferable to make the condensate of a comparatively low temperature generated in the intermediate pressure condenser and the low pressure condenser close to the condensate temperature in the high pressure condenser.
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FIG. 4A is a front sectional view showing a structure of aconventional multistage condenser 100.FIG. 4B is a side sectional view showing the structure of theconventional multistage condenser 100. - The
multistage condenser 100 is constituted by connecting ahigh pressure condenser 1, anintermediate pressure condenser 2 and alow pressure condenser 3 which are different in inner pressure, serially in this order. - The
high pressure condenser 1 has ahigh pressure turbine 81 mounted on a head side, and a high pressurecooling tube bank 8 constituted by a number of heat-transfer pipes is provided inside the condenser. At a bottom portion of thehigh pressure condenser 1, a high pressurehot well 6 is provided and acondensate outlet box 7 is also provided at a lower side. - The high pressure
hot well 6 consists of aliquid phase part 6 a serving as the bottom portion where the condensate is stored, and avapor phase part 6 b provided between theliquid phase part 6 a and the high pressurecooling tube bank 8. In addition, aheater drain tube 13 is connected to thehigh pressure condenser 1 and ahigh pressure baffle 9 is provided at the connection part. - The
intermediate pressure condenser 2 has a lower inner pressure than thehigh pressure condenser 1, and has anintermediate pressure turbine 82 mounted on a head side. An intermediate pressurecooling tube bank 28 constituted by a number of heat-transfer pipes is provided inside the condenser, similarly to thehigh pressure condenser 1. Areheat chamber 22 partitioned by apressure shroud 4 is provided at a lower portion of the intermediate pressurecooling tube bank 28. - In the
reheat chamber 22, asteam duct 10 serving as high pressure steam introducing means, connected to thehigh pressure condenser 1, is provided. At a bottom portion of theintermediate pressure condenser 2, an intermediate pressurehot well 26 is provided. The intermediate pressurehot well 26 consists of aliquid phase part 26 a serving as a bottom portion where the condensate is stored, and avapor phase part 26 b provided above theliquid phase part 26 a. Thevapor phase part 26 b is thereheat chamber 22. Theliquid phase part 6 a of the high pressurehot well 6 and theliquid phase part 26 a of the intermediate pressure hot well 26 communicate with each other by acondensate tube 11. - The
low pressure condenser 3 has a lower inner pressure than theintermediate pressure condenser 2, and has alow pressure turbine 83 mounted on a head side. A low pressurecooling tube bank 38 constituted by a number of heat-transfer pipes is provided inside the condenser, similarly to thehigh pressure condenser 1 and theintermediate pressure condenser 2. Areheat chamber 23 partitioned by apressure shroud 5 is provided at a lower portion of the low pressurecooling tube bank 38. - In the
reheat chamber 23, asteam duct 30 serving as high pressure steam introducing means is provided and connected to thereheat chamber 22 of theintermediate pressure condenser 2. At a bottom portion of thelow pressure condenser 3, a low pressurehot well 36 is provided. The low pressurehot well 36 consists of aliquid phase part 36 a serving as a bottom portion where the condensate is stored, and avapor phase part 36 b provided above theliquid phase part 36 a. Thevapor phase part 36 b is thereheat chamber 23. Theliquid phase part 26 a of the intermediate pressure hot well 26 and theliquid phase part 36 a of the low pressure hot well 36 communicate with each other by acondensate tube 31. Furthermore, theheater drain tube 13 is connected to thelow pressure condenser 3, and alow pressure baffle 39 is provided at the connection part. - As cooling water, for example, sea water is introduced into each of the high pressure
cooling tube bank 8, the intermediate pressurecooling tube bank 28 and the low pressurecooling tube bank 38. In the multistage pressure condenser, the high pressurecooling tube bank 8, the intermediate pressurecooling tube bank 28 and the low pressurecooling tube bank 38 are connected serially. The cooling water is first introduced into the low pressurecooling tube bank 38, passes through the intermediate pressurecooling tube bank 28 after passing through the low pressurecooling tube bank 38, and is finally introduced intro high pressurecooling tube bank 8 and discharged. - In the high pressure
cooling tube bank 8, the high pressure turbine exhaust which finishes the work at thehigh pressure turbine 81 and is supplied to thehigh pressure condenser 1 is condensed as a high pressure condensate by exchanging heat via the heat-transfer pipes with the cooling water of the highest temperature introduced into the high pressurecooling tube bank 8, and is recovered in theliquid phase part 6 a of the high pressurehot well 6 of thehigh pressure condenser 1. - In the intermediate pressure
cooling tube bank 28, the intermediate pressure turbine exhaust which finishes the work at theintermediate pressure turbine 82 and is supplied to theintermediate pressure condenser 2 is condensed as an intermediate pressure condensate by exchanging heat via the heat-transfer pipes with the cooling water passing through the intermediate pressurecooling tube bank 28. The intermediate pressure condensate is temporarily stored on thepressure shroud 4 of theintermediate pressure condenser 2 and then sprayed into thereheat chamber 22 through a number of circle holes formed on a perforated panel provided on thepressure shroud 4. The high pressure steam is introduced into thereheat chamber 22 from thevapor phase part 6 b of the high pressurehot well 6 provided in thehigh pressure condenser 1 via thesteam duct 10. The intermediate pressure condensate sprayed into thereheat chamber 22 by the high pressure steam is directly reheated by the heat exchange. The reheated intermediate condensate is finally stored in theliquid phase part 26 a of the intermediate pressure hot well 26, supplied to theliquid phase part 6 a of the high pressurehot well 6 via thecondensate tube 11, and supplied to a feed water heater (not shown) through acondensate outlet box 7. - In the low pressure
cooling tube bank 38, the low pressure turbine exhaust which finishes the work at thelow pressure turbine 83 and is supplied to thelow pressure condenser 3 is condensed as a low pressure condensate by exchanging heat via the heat-transfer pipes with the cooling water of the lowest temperature passing through the low pressurecooling tube bank 38. The low pressure condensate is temporarily stored on thepressure shroud 5 of thelow pressure condenser 3 and then sprayed into thereheat chamber 23 through a number of circle holes formed on a perforated panel provided on thepressure shroud 5. The high pressure steam in thevapor phase part 6 b of the high pressurehot well 6 is further introduced into thereheat chamber 23 from thereheat chamber 22 serving as thevapor phase part 26 b of the intermediate pressure hot well 26 via thesteam duct 30. The low pressure condensate sprayed into thereheat chamber 23 by the high pressure steam is directly reheated by the heat exchange. The reheated low condensate is finally stored in theliquid phase part 36 a of the low pressure hot well 36, supplied to theliquid phase part 6 a of the high pressurehot well 6 via thecondensate tube 31, theliquid phase part 26 a of the intermediate pressure hot well 26 and thecondensate tube 11, and supplied to a feed water heater (not shown) through thecondensate outlet box 7. - A heater drain generated by condensing in the feed water heater bleed steam of the steam turbine for reheating the feed water flows into the
heater drain tube 13. The flowing heater drain, which is recovered in thehigh pressure condenser 1 or thelow pressure condenser 3, collides with thehigh pressure baffle 9 or thelow pressure baffle 39, reduces the flow force and falls into theliquid phase part 6 a of the high pressurehot well 6 or theliquid phase part 36 a of the low pressure hot well 36. - As for a known condenser, for example, Jpn. Pat. Appln. KOKAI Publication No. 11-173768, Jpn. U.M. Appln. KOKOKU Publication No. 49-12482, Japanese Patent No. 3706571, Jpn. Pat. Appln. KOKAI Publication No. 49-032002 and the like should be referred to.
- The temperature of the heater drain recovered in the condenser is higher than the saturation temperature in the condenser, and oxygen is often dissolved in the heater drain at a high concentration. In some cases, 40% or more of the entire fluid flowing in the condenser is the heater drain. For this reason, the temperature of the heater drain and oxygen dissolved in the heater drain give great influences to the performance and operation of the heater and plant.
- When the heater drain collides with the baffle and falls similarly to the prior art, oxygen dissolved in the heater drain does not completely discharge but falls into the hot well, which results in increasing the concentration of oxygen dissolved in the condensate or greatly waving the liquid surface in accordance with the fall into the hot well.
- If a large quantity of oxygen is dissolved in the condensate, the constituent elements of the power plant are corroded due to the chemical reaction and the like. The oxygen dissolved in the condensate therefore needs to be maintained at a low concentration at any time during the operation of the plant.
- The present invention has been accomplished under those circumstances. The object of the present invention is to obtain a condenser capable of reducing oxygen dissolved in the heater drain recovered in the condenser.
- A condenser according to one aspect of the present invention comprises: a high pressure side condenser; a high pressure side cooling tube bank provided inside the high pressure side condenser, which has a high pressure side cooling water introduced therein and condenses a high pressure side turbine exhaust by heat exchange with the high pressure side cooling water to obtain a high pressure side condensate; a high pressure side hot well provided at a bottom portion of the high pressure side condenser; a low pressure side condenser which has an inner pressure lower than the high pressure side condenser; a low pressure side cooling tube bank provided inside the low pressure side condenser, which has a low pressure side cooling water introduced therein and condenses a low pressure side turbine exhaust by heat exchange with the low pressure side cooling water to obtain a low pressure side condensate; a pressure shroud provided at a lower part than the low pressure side cooling tube bank, inside the low pressure side condenser; a low pressure side hot well provided at a lower part of the pressure shroud, of the low pressure side condenser; high pressure steam introducing means provided at the low pressure side hot well, for communicating with an inner side of the high pressure side condenser and introducing high pressure steam; low pressure side condensate introducing means provided at the pressure shroud, for introducing a low pressure side condensate into the low pressure side hot well; a flash box which communicates with at least one of the high pressure side hot well and the low pressure side hot well, flashes a heater drain from a feed water heater, and urges at least one of the high pressure side hot well and the low pressure side hot well to recover the flashed heater drain; and a flash steam path which introduces flash steam generated inside the flash box into at least one of an interval between the high pressure side cooling tube bank and the high pressure side hot well and an interval between the low pressure side cooling tube bank and the low pressure side hot well.
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FIG. 1A is a front sectional view showing a structure of a multistage condenser according to the first embodiment of the present invention. -
FIG. 1B is a side sectional view showing the structure of the multistage condenser according to the first embodiment of the present invention. -
FIG. 2A is a front sectional view showing a structure of a multistage condenser according to the second embodiment of the present invention. -
FIG. 2B is a side sectional view showing the structure of the multistage condenser according to the second embodiment of the present invention. -
FIG. 3A is a front sectional view showing a structure of a multistage condenser according to the third embodiment of the present invention. -
FIG. 3B is a side sectional view showing the structure of the multistage condenser according to the third embodiment of the present invention. -
FIG. 4A is a front sectional view showing a structure of a multistage condenser according to the prior art. -
FIG. 4B is a side sectional view showing the structure of the multistage condenser according to the prior art. - Embodiments of the present invention are explained below with reference to the accompanying drawings.
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FIG. 1A is a front sectional view showing a structure of amultistage condenser 101 according to the first embodiment of the present invention.FIG. 1B is a side sectional view showing the structure of themultistage condenser 101 according to the first embodiment. - In
FIG. 1A andFIG. 1B , the same constituent elements as those of the prior art shown inFIG. 4A andFIG. 4B are denoted by the same reference numbers as those inFIG. 4A andFIG. 4B and their detailed explanations are omitted. - In the conventional multistage condenser shown in
FIG. 4A andFIG. 4B , thehigh pressure baffle 9 is provided at the connection part between theheater drain tube 13 and thehigh pressure condenser 1, and thelow pressure baffle 39 is provided at the connection part between theheater drain tube 13 and thelow pressure condenser 3. In themultistage condenser 101 according to the present embodiment, however, thehigh pressure baffle 9 or thelow pressure baffle 39 is not provided, but a highpressure flash box 14 is provided on an outside surface of thehigh pressure condenser 1 and a lowpressure flash box 24 is provided on an outside surface of thelow pressure condenser 3. - A
heater drain path 15 formed in a reverse concave shape is provided in the highpressure flash box 14 provided on the outside surface of thehigh pressure condenser 1. One of lower parts of theheater drain path 15 formed in the reverse concave shape is partitioned into adrain channel part 15 a and aflash steam path 17 adjacent thereto by apartition plate 15 d. At a lower part of thedrain channel part 15 a partitioned by thepartition plate 15 d, aconnection port 13 a urging the heater drain from theheater drain tube 13 to be introduced into theflash box 14 is provided. An upper part of theflash steam path 17 communicates with thedrain channel part 15 a. At a lower part of theflash steam path 17, an equalizingport 18 communicating with thevapor phase part 6 b of thehot well 6 of thehigh pressure condenser 1 is provided. Thepartition plate 15 d partitioning thedrain channel part 15 a and theflash steam path 17 is set to be high such that the heater drain supplied in thedrain channel part 15 a does not flow into theflash steam path 17 over thepartition plate 15 d. - A lower end portion of the other lower part of the
heater drain path 15 formed in a reverse concave shape is adrain fall part 15 c which communicates with theliquid phase part 6 a of the high pressurehot well 6. The drain fallpart 15 c is adjacent to thedrain channel part 15 a and apartition plate 15 e is provided therebetween. Thepartition plate 15 e is set to be lower than thepartition plate 15 d such that the heater drain introduced from theconnection port 13 a into thedrain channel part 15 a flows from thedrain channel part 15 a into thedrain fall part 15 c. Furthermore,porous plates 20 are provided at a plurality of steps inside thedrain fall part 15 c. In addition, a horizontal portion is provided on thedrain channel part 15 a on the side of thepartition plate 15 e, and this portion forms a freeliquid level part 15 b. - In other words, in the present embodiment, the
heater drain path 15 formed in theflash box 14 is constituted by three parts, i.e., thedrain channel part 15 a, thedrain fall part 15 c and theflash steam path 17. - The heater drain introduced into the high
pressure flash box 14 flows into thedrain channel part 15 a and is boiled at, particularly, the freeliquid level part 15 b to release flash steam. After that, heater drain 16 flows down in thedrain fall part 15 c over thepartition plate 15 e, becomes a liquid column at theporous plates 20 arranged at a plurality of steps in thedrain fall part 15 c, and increases an area of contact with the steam. At this time, theheater drain 16 falls while releasing the non-flashed steam, releases uncondensed gas such as oxygen dissolved in theheater drain 16, and deaerated. Thedeaerated heater drain 16 joins the condensate stored in theliquid phase part 6 a of the high pressurehot well 6 from a bottom portion of thedrain fall part 15 c. The flash steam and uncondensed gas generated from theheater drain 16 are introduced into theflash steam path 17 over thepartition plate 15 d from an upper part of thedrain channel part 15 a to flow into thevapor phase part 6 b of the hot well 6 (between the high pressure coolingtube bank 8 and the high pressure hot well 6) from the equalizingport 18 provided at the lower end of theflash steam path 17. - In the present embodiment, the low
pressure flash box 24 is further provided on the side surface of thelow pressure condenser 3. Theheater drain path 15 is constituted by thedrain channel part 15 a, thedrain fall part 15 c and theflash steam path 17, similarly to the highpressure flash box 14, and the lowpressure flash box 24 acts similarly. The steam and the uncondensed gas flowing through theflash steam path 17 of the lowpressure flash box 24 are introduced into thevapor phase part 36 b of thehot well 36 of the low pressure condenser 3 (between the low pressure coolingtube bank 38 and the low pressure hot well 36), i.e., into thereheat chamber 23 from the equalizingport 18. In the multistage condenser, as described above, the high pressurehot well 6, the intermediate pressurehot well 26 and the low pressurehot well 36 act similarly since they communicate with each other at the vapor phase part by thesteam tubes condensate tubes - Thus, according to the present embodiment, the
heater drain 16 can be recovered in themultistage condenser 101 after the uncondensed gas such as dissolved oxygen is reduced sufficiently. - In addition, since the flash steam generated in the high
pressure flash box 14 and the lowpressure flash box 24 according to the present embodiment is introduced into themultistage condenser 101 via theflash steam path 17, the flash steam can be used to reheat the condensate flowing down from thepressure shroud 4 and thepressure shroud 5 and the heat efficiency can be thereby enhanced. - Furthermore, the high
pressure flash box 14 and the lowpressure flash box 24 according to the present embodiment maintain wide space for boiling theheater drain 16 by forming the freeliquid level part 15 b having a wide surface area at thedrain path part 15 a in theheater drain path 15, and can efficiently perform flashing and promote deaeration. In addition, by forming the freeliquid level part 15 b, the liquid level inside the drain tank connected to the heater drain system can also be controlled to be at a predetermined height. -
FIG. 2A is a front sectional view showing a structure of amultistage condenser 102 according to the second embodiment of the present invention.FIG. 2B is a side sectional view showing the structure of themultistage condenser 102 according to the second embodiment. - The same constituent elements as those of the first embodiment shown in
FIG. 1A andFIG. 1B are denoted by the same reference numbers as those inFIG. 1A andFIG. 1B and their detailed explanations are omitted. - The
flash steam path 17 is provided adjacent to thedrain channel part 15 a of theheater drain path 15 via thepartition plate 15 d inFIG. 1A andFIG. 1B . In a highpressure flash box 34 and a lowpressure flash box 44 of themultistage condenser 102 according to the present embodiment, aflash steam path 47 is arranged adjacent to thedrain fall part 15 c, at a lower part of the freeliquid level part 15 b of thedrain channel part 15 a.Steam outlets 19 for supplying flash steam into theflash steam path 47 are provided on a wall surface of thedrain fall part 15 c which faces theflash steam path 47. - In this structure, the flash steam generated from the
drain fall part 15 c passes through thesteam outlets 19 and is supplied to theflash steam path 47 after contacting theheater drain 16 falling down from theporous plates 20. - Since the falling
heater drain 16 and the steam can thereby contact easily, deaeration of the uncondensed gas such as dissolved oxygen in theheater drain 16 can be promoted, theheater drain 16 can be recovered in themultistage condenser 102 after performing the deaeration sufficiently, and the same advantage as that of the first embodiment can be obtained. - In addition, the
heater drain path 15 formed in each of the highpressure flash box 34 and the lowpressure flash box 44 according to the present embodiment, is in an approximately rectangular shape, and can be downsized as compared with the highpressure flash box 14 and the lowpressure flash box 24 according to the first embodiment. -
FIG. 3A is a front sectional view showing a structure of amultistage condenser 103 according to the third embodiment of the present invention.FIG. 3B is a side sectional view showing the structure of themultistage condenser 103 according to the third embodiment. - The same constituent elements as those of the first embodiment shown in
FIG. 1A andFIG. 1B are denoted by the same reference numbers as those inFIG. 1A andFIG. 1B and their detailed explanations are omitted. - The
heater drain path 15 is formed in the reverse concave shape inFIG. 1A andFIG. 1B . In a highpressure flash box 54 and a lowpressure flash box 64 of themultistage condenser 103 according to the present embodiment, aheater drain path 55 is formed in a shape of approximately rectangular parallelepiped, and theheater drain path 55 shaped in an approximately rectangular parallelepiped is partitioned into adrain fall part 55 c and theflash steam path 17 by apartition plate 55 d. Theheater drain path 55 according to the present embodiment does not have a drain channel part or a free liquid level part, but is constituted by the only drain fallpart 55 c andflash steam path 17. Theconnection port 13 a for introducing the heater drain into theflash box 54 is provided at an upper end of thedrain fall part 55 c and, and a lower end of thedrain fall part 55 c communicates with theliquid phase part 6 a of the high pressurehot well 6. Theporous plates 20 are provided at a plurality of steps in thedrain fall part 55 c, similarly to the first and second embodiments. - The
heater drain 16 becomes a liquid column at theporous plates 20 arranged at a plurality of steps in thedrain fall part 55 c, increases an area of contact with the steam, falls down while releasing the flash steam, releases uncondensed gas such as oxygen dissolved in theheater drain 16, and is thereby deaerated. - Thus, in the present embodiment, too, the
heater drain 16 can be recovered in themultistage condenser 103 after sufficiently reducing the uncondensed gas such as dissolved oxygen and the like, similarly to the first and second embodiments. - In addition, since the flash steam generated in the high
pressure flash box 54 and the lowpressure flash box 64 is introduced into themultistage condenser 103 via theflash steam path 17, the flash steam can be used to reheat the condensate flowing down from thepressure shroud 4 and thepressure shroud 5 and the heat efficiency can be thereby enhanced. - Moreover, in the present invention, since the
heat drain path 55 is constituted by the only drain fallpart 55 c and theflash steam path 17, the highpressure flash box 54 and the lowpressure flash box 64 can be further downsized. - In the present embodiment, too, the
steam outlets 19 may be provided on thedrain fall part 55 c to urge the fallingheater drain 16 to contact a more quantity of the flash steam, similarly to the second embodiment shown inFIG. 2A andFIG. 2B . - In the first to third embodiments, the multistage condenser having the high pressure condenser, the intermediate pressure condenser, and the low pressure condenser combined is described. However, the present invention can be applied to all of multistage condensers having a plurality of condensers of different pressures combined, such as a multistage condenser having a high pressure condenser and a low pressure condenser combined, and the like.
- In those embodiments, the flash box is provided on each of the high pressure condenser and the low pressure condenser. However, the flash box may be provided on all or one of condensers, for example, of some of condensers such as a high pressure condenser, an intermediate pressure condenser and a low pressure condenser. In addition, one of the flash boxes according to the first to third embodiments can be arranged on the high pressure condenser and one of the others can be arranged on the low pressure condenser. The flash boxes can be applied in combination.
- Furthermore, in those embodiments, the flash boxes are provided on the outside surfaces of the condensers, but may be provided on any parts of the entry side of the heater drain into the condensers, such as the inner side surfaces of the condensers, or separately from the condensers.
- In addition, the multistage condenser is exemplified in the above-described embodiments, but the present invention is not limited to this, but can also be applied to a single-pressure condenser (condenser constituted by one shell). In a case where any one of the flash boxes described in the first to third embodiments is provided on a condenser of a single turbine, the heater drain introduced into the condenser can be separated into the vapor phase and the liquid phase and dissolved oxygen in the heater drain can be reduced.
- The present invention can provide a condenser capable of separating a heater drain introduced therein into a vapor phase and a liquid phase and reducing oxygen dissolved in the heater drain.
Claims (12)
1. A condenser comprising:
a high pressure side condenser;
a high pressure side cooling tube bank provided inside the high pressure side condenser, which has a high pressure side cooling water introduced therein and condenses a high pressure side turbine exhaust by heat exchange with the high pressure side cooling water to obtain a high pressure side condensate;
a high pressure side hot well provided at a bottom portion of the high pressure side condenser;
a low pressure side condenser which has an inner pressure lower than the high pressure side condenser;
a low pressure side cooling tube bank provided inside the low pressure side condenser, which has a low pressure side cooling water introduced therein and condenses a low pressure side turbine exhaust by heat exchange with the low pressure side cooling water to obtain a low pressure side condensate;
a pressure shroud provided at a lower part than the low pressure side cooling tube bank, inside the low pressure side condenser;
a low pressure side hot well provided at a lower part of the pressure shroud, of the low pressure side condenser;
high pressure steam introducing means provided at the low pressure side hot well, for communicating with an inner side of the high pressure side condenser and introducing high pressure steam;
low pressure side condensate introducing means provided at the pressure shroud, for introducing a low pressure side condensate into the low pressure side hot well;
a flash box which communicates with at least one of the high pressure side hot well and the low pressure side hot well, flashes a heater drain from a feed water heater, and urges at least one of the high pressure side hot well and the low pressure side hot well to recover the flashed heater drain; and
a flash steam path which introduces flash steam generated inside the flash box into at least one of an interval between the high pressure side cooling tube bank and the high pressure side hot well and an interval between the low pressure side cooling tube bank and the low pressure side hot well.
2. The condenser according to claim 1 , wherein the flash box has a heater drain path which has one end connected to a connection port for introducing the heater drain and the other end communicating with at least one of a high pressure side condensate and a low pressure side condensate stored in at least one of the high pressure side hot well and the low pressure side hot well.
3. The condenser according to claim 2 , wherein the heater drain path has a drain fall part which communicates with at least one of the high pressure side hot well and the low pressure side hot well.
4. The condenser according to claim 3 , wherein the heater drain path is formed in a reverse concave shape, and has a free liquid level part at a horizontal part between a drain channel part communicating with the connection port and the drain fall part.
5. The condenser according to claim 3 , wherein a porous plate is provided at the drain fall part.
6. The condenser according to claim 3 , wherein the drain fall part is provided adjacent to the flash steam path, and a steam outlet for supplying flash steam to the flash steam path is provided on a wall surface facing the flash steam path.
7. A condenser comprising:
a cooling tube bank provided inside the condenser, which has a cooling water introduced therein and condenses a turbine exhaust by heat exchange with the cooling water to obtain a condensate;
a hot well provided at a bottom portion of the condenser;
a flash box which communicates with the hot well, flashes a heater drain from a feed water heater, and urges the hot well to recover the flashed heater drain; and
a flash steam path which introduces flash steam generated inside the flash box into an interval between the cooling tube bank and the hot well.
8. The condenser according to claim 7 , wherein the flash box has a heater drain path which has one end connected to a connection port for introducing the heater drain and the other end communicating with condensate stored in the hot well.
9. The condenser according to claim 8 , wherein the heater drain path has a drain fall part which communicates with the hot well.
10. The condenser according to claim 9 , wherein the heater drain path is formed in a reverse concave shape, and has a free liquid level part at a horizontal part between a drain channel part communicating with the connection port and the drain fall part.
11. The condenser according to claim 9 , wherein a porous plate is provided at the drain fall part.
12. The condenser according to claim 9 , wherein the drain fall part is provided adjacent to the flash steam path, and a steam outlet for supplying flash steam to the flash steam path is provided on a wall surface facing the flash steam path.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/719,346 US8833744B2 (en) | 2007-12-10 | 2012-12-19 | Condenser |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007-318632 | 2007-12-10 | ||
JP2007318632 | 2007-12-10 | ||
PCT/JP2008/072433 WO2009075300A1 (en) | 2007-12-10 | 2008-12-10 | Steam condenser |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2008/072433 Continuation WO2009075300A1 (en) | 2007-12-10 | 2008-12-10 | Steam condenser |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/719,346 Continuation US8833744B2 (en) | 2007-12-10 | 2012-12-19 | Condenser |
Publications (1)
Publication Number | Publication Date |
---|---|
US20100031656A1 true US20100031656A1 (en) | 2010-02-11 |
Family
ID=40755541
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/579,800 Abandoned US20100031656A1 (en) | 2007-12-10 | 2009-10-15 | Condenser |
US13/719,346 Active US8833744B2 (en) | 2007-12-10 | 2012-12-19 | Condenser |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/719,346 Active US8833744B2 (en) | 2007-12-10 | 2012-12-19 | Condenser |
Country Status (6)
Country | Link |
---|---|
US (2) | US20100031656A1 (en) |
EP (1) | EP2218999B1 (en) |
JP (1) | JP5197602B2 (en) |
CN (1) | CN101627276B (en) |
CA (1) | CA2683489C (en) |
WO (1) | WO2009075300A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5300618B2 (en) * | 2009-06-24 | 2013-09-25 | 株式会社東芝 | Multi-stage pressure condenser |
US9488416B2 (en) | 2011-11-28 | 2016-11-08 | Mitsubishi Hitachi Power Systems, Ltd. | Multistage pressure condenser and steam turbine plant having the same |
JP5737215B2 (en) * | 2012-03-13 | 2015-06-17 | 株式会社島津製作所 | Sample cooling device and sampling device |
JP6431383B2 (en) * | 2015-01-16 | 2018-11-28 | 株式会社東芝 | Flush box and condenser equipped with the same |
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- 2008-12-10 WO PCT/JP2008/072433 patent/WO2009075300A1/en active Application Filing
- 2008-12-10 EP EP08860801.3A patent/EP2218999B1/en active Active
- 2008-12-10 CA CA2683489A patent/CA2683489C/en active Active
- 2008-12-10 CN CN200880004438.XA patent/CN101627276B/en active Active
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Also Published As
Publication number | Publication date |
---|---|
WO2009075300A1 (en) | 2009-06-18 |
EP2218999A1 (en) | 2010-08-18 |
JP5197602B2 (en) | 2013-05-15 |
US20130118723A1 (en) | 2013-05-16 |
US8833744B2 (en) | 2014-09-16 |
CA2683489A1 (en) | 2009-06-18 |
JPWO2009075300A1 (en) | 2011-04-28 |
CA2683489C (en) | 2012-04-03 |
CN101627276B (en) | 2012-01-04 |
EP2218999B1 (en) | 2016-07-06 |
EP2218999A4 (en) | 2014-05-14 |
CN101627276A (en) | 2010-01-13 |
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