JP3615831B2 - Condensate deaerator - Google Patents
Condensate deaerator Download PDFInfo
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- JP3615831B2 JP3615831B2 JP15010495A JP15010495A JP3615831B2 JP 3615831 B2 JP3615831 B2 JP 3615831B2 JP 15010495 A JP15010495 A JP 15010495A JP 15010495 A JP15010495 A JP 15010495A JP 3615831 B2 JP3615831 B2 JP 3615831B2
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- Prior art keywords
- condensate
- condenser
- storage tank
- deaerator
- water storage
- Prior art date
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- Degasification And Air Bubble Elimination (AREA)
- Physical Water Treatments (AREA)
Description
【０００１】
【産業上の利用分野】
本発明は蒸気プラントの起動時に復水を脱気する設備に関する。
【０００２】
【従来の技術】
ボイラ給水中に酸素など非凝縮性のガスが溶け込んでいると、ボイラや付属装置に電気的または化学的腐食が生ずるので、これを除去しなければならない。ところが、プラント停止時に復水器の真空破壊を行なった場合、復水器内の復水は空気と接触して酸素（Ｏ２ ）リッチとなる。したがって再起動時には、その復水を十分に脱気してボイラ給水とする必要がある。
【０００３】
図３は従来の起動用復水脱気システムの一例を示す系統図である。復水器（１）に起動用脱気器（２）を一体に取付け、真空破壊後のホットウェル（４）内の非脱気水を低圧給水ポンプ（５）によって起動用脱気器（２）へ循環させ、復水を脱気する。なお図３中（８）、（１３）、（１８）は復水弁、（１１）は脱気器水位調節弁、（１７）は復水再循環管路である。
【０００４】
【発明が解決しようとする課題】
ＤＳＳ（Ｄａｉｌｙ Ｓｔａｒｔ ＆ Ｓｔｏｐ）の行なわれるプラントの再起動時のように、プラントを短時間で起動して通常運転に移行することが要求される場合がある。しかし、プラント停止中に復水器が真空破壊されていると、再起動時に脱気のため時間がかかり要求される短時間の起動は困難であった。
【０００５】
【課題を解決するための手段】
本発明者は、前記従来の課題を解決するために、復水器を有する蒸気プラントにおいて、上記復水器のホットウェルとは別の気密の貯水タンクと起動用脱気器とを上記復水器と一体に形成するとともに、上記ホットウェルの底部から低圧給水ポンプへ至る管路に設けられた復水弁の出口に上記貯水タンクの底部を連通させる復水弁付きの管路と、上記低圧給水ポンプの出口からグランドコンデンサを経て上記起動用脱気器の上部に至る復水弁付きの管路と、上記起動用脱気器の底部から上記貯水タンクの上部に至る復水弁付きの管路と、上記貯水タンクの上部に連通する空気抜き弁とを設けたことを特徴とする復水脱気装置を提案するものである。
【０００６】
【作用】
本発明は前記構成を有するので、プラント停止時に起動用脱気器と貯水タンクの各空気抜き弁を閉じたままにしておけば、貯水タンク内の水は空気と接触しないから、脱気された状態に保たれる。
【０００７】
そこで再起動時は、ホットウェル・低圧給水ポンプ間の復水弁を閉じ、貯水タンク・低圧給水ポンプ間の復水弁と起動用脱気器・貯水タンク間の復水弁を開いて、低圧給水ポンプを起動し、復水再循環運転をする。そうすると復水器内の真空度が上昇してゆく。真空上昇完了後、グランドコンデンサ下流の復水弁を開いてボイラへ送水を開始し、給水系を全て運転状態としてプラントを起動する。
【０００８】
このように再起動時に貯水タンク内の脱気水を再循環させて起動できるので、起動時間が短縮される。
【０００９】
【実施例】
図１は本発明の一実施例に係る復水脱気装置を示す系統図である。
【００１０】
復水器（１）には、起動用脱気器（２）と、復水器のホットウェル（４）とは別の気密の貯水タンク（３）とが、一体に取付けられている。復水器（１）のホットウェル（４）と貯水タンク（３）とは、同一レベルで復水を共有する構造になっている。貯水タンク（３）の容量は定格給水量の約５分間分程度とする。
【００１１】
ホットウェル（４）の底部から低圧給水ポンプ（５）へ至る管路（６）に設けられた復水弁（８）の出口に貯水タンク（３）の底部を連通させる管路（７）が設けられ、この管路には復水弁（９）が設けられる。低圧給水ポンプ（５）の出口からグランドコンデンサ（１２）を経て起動用脱気器（２）の上部に至る復水再循環管路（１７）にも復水弁（１８）が設けられる。また起動用脱気器（２）の底部から貯水タンク（３）の上部に至る管路（１０）にも、その起動用脱気器（２）の水位を調節するため復水弁（１１）が設けられている。更にグランドコンデンサ（１２）の下流で復水再循環管路（１７）が分岐する分岐部の下流にも復水弁（１３）が設けられている。これら各弁の操作により、脱気復水はそれぞれ隔離できる構造になっている。また復水器（１）、起動用脱気器（２）、貯水タンク（３）には、それぞれ、空気抜き弁（１４ａ）、（１４ｂ）、（１４ｃ）が設けられている。なお符号（１５）はレベル調節計、符号（１６）はレベルスイッチをそれぞれ示す。
【００１２】
図２は本実施例の復水器（１）の概略構造を示す図であって、図２（ａ）は復水器の正面図、図２（ｂ）は同じく側面図、図２（ｃ）は貯水タンク内の平面図である。復水器（１）は起動用脱気器（２）および貯水タンク（３）と一体の構造となっている。貯水タンク（３）内は仕切板によって仕切られている。
【００１３】
プラント停止時には、空気抜き弁（１４ａ）を開いて復水器（１）内を真空破壊するが、空気抜き弁（１４ｂ）、（１４ｃ）は閉じたままとする。したがって、ホットウェル（４）内の水は空気と接触して酸素等を溶け込ませることになるが、貯水タンク（３）内の水は脱気された状態に保たれる。
【００１４】
再起動時は、ホットウェル（４）・低圧給水ポンプ（５）間の復水弁（８）を閉じ、貯水タンク（３）・低圧給水ポンプ（５）間の復水弁（９）と起動用脱気器（２）・貯水タンク（３）間の調節弁（１１）を開いて、低圧給水ポンプ（５）を起動し、復水再循環運転を行なう。そうすると、復水器（１）内の真空度が上昇してゆく。真空上昇完了後、グランドコンデンサ（１２）下流の復水弁（１３）を開いてボイラへ送水を開始し、給水系を全て運転状態としてプラントを起動する。
【００１５】
このように、再起動時に貯水タンク（３）内の水とホットウェル（４）内の水を共有している、すなわち両者の圧力がバランスし、復水のレベルが一定に保たれているので、貯水タンク（３）内の脱気水を再循環させて起動でき、したがって起動時間が短縮される。
【００１６】
【発明の効果】
本発明の復水脱気装置によれば、再起動時に貯水タンク内の脱気された水を再循環させて起動できるので、プラントの起動時間が短縮される。したがってＤＳＳ停止時などに従来のように循環水ポンプを常時運転して真空を保持する必要がなくなる。それに伴ってポンプ動力費が節減でき、省エネルギープラントが実現できる。
【図面の簡単な説明】
【図１】図１は本発明の一実施例に係る復水脱気装置を示す系統図である。
【図２】図２は上記実施例の復水器の概略構造を示す図であって、図２（ａ）は復水器の正面図、図２（ｂ）は同じく側面図、図２（ｃ）は貯水タンク内の平面図である。
【図３】図３は従来の起動用復水脱気システムの一例を示す系統図である。
【符号の説明】
（１） 復水器
（２） 起動用脱気器
（３） 貯水タンク
（４） ホットウェル
（５） 低圧給水ポンプ
（６）、（７） 管路
（８）、（９） 復水弁
（１０） 管路
（１１） 復水弁（脱気器水位調節弁）
（１２） グランドコンデンサ
（１３） 復水弁
（１４ａ）、（１４ｂ）、（１４ｃ） 空気抜き弁
（１５） レベル調節計
（１６） レベルスイッチ
（１７） 復水再循環管路
（１８） 復水弁[0001]
[Industrial application fields]
The present invention relates to equipment for degassing condensate when a steam plant is started.
[0002]
[Prior art]
If a non-condensable gas such as oxygen is dissolved in the boiler feed water, it will cause electrical or chemical corrosion in the boiler and attached equipment, which must be removed. However, when the condenser is vacuum-ruptured when the plant is stopped, the condensate in the condenser comes into contact with air and becomes rich in oxygen (O 2 ). Therefore, at the time of restart, it is necessary to sufficiently degas the condensate to supply boiler water.
[0003]
FIG. 3 is a system diagram showing an example of a conventional start-up condensate deaeration system. The starter deaerator (2) is integrally attached to the condenser (1), and the non-deaerated water in the hot well (4) after the vacuum break is removed by the low pressure feed pump (5). ) To degas the condensate. In FIG. 3, (8), (13) and (18) are condensate valves, (11) is a deaerator water level control valve, and (17) is a condensate recirculation conduit.
[0004]
[Problems to be solved by the invention]
There are cases where it is required to start the plant in a short time and shift to normal operation, such as at the time of restarting the plant where DSS (Daily Start & Stop) is performed. However, if the condenser is broken in vacuum while the plant is shut down, it takes time to restart and it is difficult to start up in a short time.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned conventional problems, the present inventor, in a steam plant having a condenser, has an airtight water storage tank and a start-up deaerator different from the hot well of the condenser. And a conduit with a condensate valve that communicates the bottom of the water storage tank with an outlet of a condensate valve provided in a conduit from the bottom of the hot well to the low pressure feed pump, and the low pressure A conduit with a condensate valve from the outlet of the feed water pump through the ground condenser to the top of the starter deaerator, and a tube with a condensate valve from the bottom of the starter deaerator to the top of the water storage tank The present invention proposes a condensate deaerator having a passage and an air vent valve communicating with an upper portion of the water storage tank.
[0006]
[Action]
Since the present invention has the above-described configuration, the water in the water storage tank does not come into contact with the air if the venting valves for the start-up deaerator and the water storage tank are kept closed when the plant is stopped. To be kept.
[0007]
Therefore, when restarting, close the condensate valve between the hot well and the low-pressure feed pump, open the condensate valve between the water tank and the low-pressure feed pump, and the condensate valve between the start deaerator and the water tank. Start the water supply pump and perform condensate recirculation operation. Then, the degree of vacuum in the condenser will increase. After completion of the vacuum rise, the condensate valve downstream of the ground condenser is opened to start water supply to the boiler, and the plant is started with all the water supply systems in operation.
[0008]
As described above, since the deaerated water in the water storage tank can be recirculated at the time of reactivation, the activation time can be shortened.
[0009]
【Example】
FIG. 1 is a system diagram showing a condensate deaerator according to an embodiment of the present invention.
[0010]
The condenser (1) is integrally provided with an activation deaerator (2) and an airtight water storage tank (3) separate from the condenser hot well (4). The hot well (4) and the water storage tank (3) of the condenser (1) share the condensate at the same level. The capacity of the water storage tank (3) is about 5 minutes of the rated water supply.
[0011]
A pipe line (7) for communicating the bottom part of the water storage tank (3) with the outlet of the condensate valve (8) provided in the pipe line (6) from the bottom part of the hot well (4) to the low pressure feed water pump (5). A condensate valve (9) is provided in this pipe line. A condensate valve (18) is also provided in the condensate recirculation line (17) from the outlet of the low-pressure feed pump (5) through the ground condenser (12) to the upper part of the start-up deaerator (2). A condensate valve (11) is also provided in the conduit (10) from the bottom of the startup deaerator (2) to the top of the water storage tank (3) to adjust the water level of the startup deaerator (2). Is provided. Further, a condensate valve (13) is also provided downstream of the branch portion where the condensate recirculation pipe (17) branches downstream of the ground condenser (12). By operating these valves, the degassed condensate can be isolated. The condenser (1), the start-up deaerator (2), and the water storage tank (3) are provided with air vent valves (14a), (14b), and (14c), respectively. Reference numeral (15) denotes a level controller, and reference numeral (16) denotes a level switch.
[0012]
FIG. 2 is a diagram showing a schematic structure of the condenser (1) of the present embodiment. FIG. 2 (a) is a front view of the condenser, FIG. 2 (b) is a side view thereof, and FIG. ) Is a plan view of the water storage tank. The condenser (1) has an integral structure with the starting deaerator (2) and the water storage tank (3). The water storage tank (3) is partitioned by a partition plate.
[0013]
When the plant is stopped, the air vent valve (14a) is opened to break the vacuum in the condenser (1), but the air vent valves (14b) and (14c) remain closed. Therefore, the water in the hot well (4) comes into contact with air and dissolves oxygen or the like, but the water in the water storage tank (3) is kept in a deaerated state.
[0014]
When restarting, close the condensate valve (8) between the hot well (4) and the low-pressure feed pump (5) and start with the condensate valve (9) between the storage tank (3) and the low-pressure feed pump (5). The control valve (11) between the water deaerator (2) and the water storage tank (3) is opened, the low-pressure feed water pump (5) is started, and condensate recirculation operation is performed. Then, the degree of vacuum in the condenser (1) increases. After completion of the vacuum rise, the condensate valve (13) downstream of the ground condenser (12) is opened to start water supply to the boiler, and the plant is started with all the water supply systems operating.
[0015]
Thus, at the time of restart, the water in the water storage tank (3) and the water in the hot well (4) are shared, that is, the pressure of both balances and the level of condensate is kept constant. The degassed water in the water storage tank (3) can be recirculated and activated, and therefore the activation time is shortened.
[0016]
【The invention's effect】
According to the condensate deaeration apparatus of the present invention, the deaerated water in the water storage tank can be recirculated at the time of restart, so that the start-up time of the plant is shortened. Therefore, when the DSS is stopped, there is no need to maintain the vacuum by always operating the circulating water pump. Along with this, the pump power cost can be reduced and an energy saving plant can be realized.
[Brief description of the drawings]
FIG. 1 is a system diagram showing a condensate deaerator according to an embodiment of the present invention.
FIG. 2 is a diagram showing a schematic structure of the condenser of the above embodiment. FIG. 2 (a) is a front view of the condenser, FIG. 2 (b) is a side view thereof, and FIG. c) is a plan view of the water storage tank.
FIG. 3 is a system diagram showing an example of a conventional start-up condensate deaeration system.
[Explanation of symbols]
(1) Condenser (2) Start-up deaerator (3) Water storage tank (4) Hot well (5) Low pressure feed pump (6), (7) Pipe line (8), (9) Condensate valve ( 10) Pipeline (11) Condensate valve (deaerator water level control valve)
(12) Grand condenser (13) Condensate valve (14a), (14b), (14c) Air vent valve (15) Level controller (16) Level switch (17) Condensate recirculation conduit (18) Condensate valve
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15010495A JP3615831B2 (en) | 1995-06-16 | 1995-06-16 | Condensate deaerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15010495A JP3615831B2 (en) | 1995-06-16 | 1995-06-16 | Condensate deaerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH094989A JPH094989A (en) | 1997-01-10 |
| JP3615831B2 true JP3615831B2 (en) | 2005-02-02 |
Family
ID=15489597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15010495A Expired - Lifetime JP3615831B2 (en) | 1995-06-16 | 1995-06-16 | Condensate deaerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3615831B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103573306B (en) * | 2013-11-12 | 2015-11-18 | 中国电力工程顾问集团西南电力设计院有限公司 | The adjacent machine of a kind of thermal power plant auxiliary vapour heating boiler start up system |
-
1995
- 1995-06-16 JP JP15010495A patent/JP3615831B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH094989A (en) | 1997-01-10 |
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