JP2610600B2 - Water level control method for multi-tube once-through boiler - Google Patents
Water level control method for multi-tube once-through boilerInfo
- Publication number
- JP2610600B2 JP2610600B2 JP63094194A JP9419488A JP2610600B2 JP 2610600 B2 JP2610600 B2 JP 2610600B2 JP 63094194 A JP63094194 A JP 63094194A JP 9419488 A JP9419488 A JP 9419488A JP 2610600 B2 JP2610600 B2 JP 2610600B2
- Authority
- JP
- Japan
- Prior art keywords
- water level
- water
- level detector
- boiler
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 133
- 238000000034 method Methods 0.000 title claims description 6
- 238000001514 detection method Methods 0.000 claims description 43
- 238000002485 combustion reaction Methods 0.000 claims description 7
- 238000009835 boiling Methods 0.000 description 5
- 230000005856 abnormality Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000013021 overheating Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Landscapes
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、多管式貫流ボイラーの水位を燃焼状態に合
わせて調整する水位制御方法に関するものである。Description: TECHNICAL FIELD The present invention relates to a water level control method for adjusting the water level of a multi-tube once-through boiler in accordance with a combustion state.
（従来の技術） 従来、多管式貫流ボイラーの水位制御は、上部管寄せ
と下部管寄せとを連結した水位検出筒に高水位検出器、
中水位検出器、低水位検出器を付設し、高水位検出器か
らの水位検出信号を受けたとき、給水ポンプのOFF信号
を出力、中水位検出器から水位不検出信号を受けたと
き、給水ポンプON信号を出力、低水位検出器から水位不
検出信号を受けたとき燃焼停止信号を出力する方法が知
られている。(Prior art) Conventionally, the water level control of a multi-tube once-through boiler is performed by using a high water level detector in a water level detecting cylinder connecting an upper header and a lower header.
A middle water level detector and a low water level detector are attached.When the water level detection signal is received from the high water level detector, the OFF signal of the water supply pump is output.When the water level non-detection signal is received from the middle water level detector, the water supply is performed. There is known a method of outputting a pump ON signal and outputting a combustion stop signal when receiving a water level non-detection signal from a low water level detector.
燃焼を行っているボイラー内では、缶水は沸騰してい
るために持ち上げられるが、上下管寄せの間に設けた水
位検出筒では沸騰がなく、ボイラ内水量を正確に検出す
ることができる。In a boiler that is burning, boiler water is lifted because it is boiling. However, the water level detection cylinder provided between the upper and lower pipe drawers does not boil, and the amount of water in the boiler can be accurately detected.
ところが、多管式貫流ボイラーの最適水位は、圧力の
変化、負荷の変化に対して変動し、燃焼開始時の沸き上
がりの無い場合には水管上部の過熱を防ぐために水位は
高い方が良く、連続燃焼中で盛んに蒸発しており缶水の
沸き上がりが有る場合には、乾き度低下、キャリオーバ
ーの防止のために水位は低い方が良い。However, the optimum water level of the multi-tube once-through boiler fluctuates with changes in pressure and load.If there is no boiling at the start of combustion, the higher the water level is better to prevent overheating of the upper part of the water pipe, In the case where the water evaporates vigorously during continuous combustion and boiler water is boiling, the lower the water level, the better in order to prevent a decrease in dryness and carryover.
そのため、圧力、負荷の状態毎に水位検出器を設け、
状態毎に水位検出器を切り替えて制御する必要があり、
水位検出筒の大型化、水位検出器の増大を、招くことと
なる。Therefore, a water level detector is provided for each pressure and load condition,
It is necessary to control by switching the water level detector for each state,
This leads to an increase in the size of the water level detection cylinder and an increase in the water level detector.
（発明の目的） 本発明は、上記従来技術の項で指摘した問題点を改善
しようとするもので、水位検出筒の大型化、水位検出器
の増大を招くことなく、最適水位制御を行う水位制御方
法を提供することを目的とするものである。(Object of the Invention) The present invention is intended to improve the problems pointed out in the above-mentioned section of the prior art, and a water level for performing optimum water level control without increasing the size of the water level detection cylinder and increasing the water level detector. It is an object to provide a control method.
（目的を達成するための手段） 本発明は上記目的を達成するための手段として、気水
分離器と下部管寄せとを連結した水位検出筒Ａと、上部
管寄せと下部管寄せとを連結した水位検出筒Ｂの２本の
水位検出筒を設け、水位検出筒Ａに高水位検出器および
中水位検出器、水位検出筒Ｂに低水位検出器を備え、高
水位検出器から水位検出信号を受けたとき、給水ポンプ
のOFF信号を出力、中水位検出器から水位不検出信号を
受けたとき、給水ポンプON信号を出力、低水位検出器か
ら水位不検出信号を受けたとき燃焼停止信号を出力する
ようにしたものである。(Means for Achieving the Object) The present invention provides, as means for achieving the above object, a water level detection cylinder A in which a steam separator and a lower header are connected, and an upper header and a lower header connected. Two water level detection cylinders of the water level detection cylinder B are provided, a water level detection cylinder A is provided with a high water level detector and a medium water level detector, a water level detection cylinder B is provided with a low water level detector, and a water level detection signal is output from the high water level detector. When receiving water supply pump OFF signal, when receiving water level non-detection signal from medium water level detector, output water supply pump ON signal, when receiving water level non-detection signal from low water level detector, combustion stop signal Is output.
（作用） 本発明では、上記手段により、以下の作用が得られ
る。(Action) In the present invention, the following action is obtained by the above means.
気水分離器と上部管寄せとを連結する連絡管を蒸気が
通過する際、圧力、負荷の変化すなわち、蒸気流量に応
じて差が生じる。起動時には蒸気が発生していないため
気水分離器と缶内に圧力差は無く、缶内水位と水位検出
筒内水位は同位置となる。運転時には発生した蒸気は連
絡管を通って気水分離器へ送られるが、連絡管の口径が
小さいほど気水分離器と缶内に圧力差が発生し、圧力差
が発生すると缶内水位は水位検出筒内水位に比べ低くな
る。水位検出筒内水位を一定に保つと、缶内水位は沸き
上がりが大きくなるにつれて低くなる。すなわち、上部
管寄せと気水分離器との連絡管口径を適正に選定するこ
とによって、圧力、負荷の変化に対応した適正水位に制
御することが可能となる。When the steam passes through the connecting pipe connecting the steam separator and the upper header, a difference occurs depending on a change in pressure and load, that is, a steam flow rate. Since no steam is generated at the time of startup, there is no pressure difference between the steam-water separator and the can, and the water level in the can and the water level in the water level detection cylinder are at the same position. During operation, the generated steam is sent to the steam separator through the connecting pipe, but the smaller the diameter of the connecting pipe, the more the pressure difference is generated between the steam separator and the can, and when the pressure difference occurs, the water level in the can becomes It is lower than the water level in the water level detection cylinder. If the water level in the water level detection cylinder is kept constant, the water level in the can decreases as the boiling increases. That is, by appropriately selecting the diameter of the communication pipe between the upper header and the steam separator, it is possible to control the water level to an appropriate level corresponding to changes in pressure and load.
ただ、水位検出筒Ａは上述のように連結されているた
め、水面のおどりが上下管寄せの間を連結した水位検出
筒に比べ大きくなる。そのため、水位検出筒Ａに低水位
検出器を付設した場合、急激な蒸気流量の変化によっ
て、低水位異常（缶水異常）となる可能性がある。However, since the water level detection cylinder A is connected as described above, the water level dance is larger than that of the water level detection cylinder connected between the upper and lower pipes. Therefore, when a low water level detector is attached to the water level detection tube A, a sudden change in steam flow rate may cause a low water level abnormality (canned water abnormality).
そこで、低水位検出器は上部管寄せと下部管寄せを連
結した水位検出筒Ｂに付設し、水管の過熱を防止するた
めの最低位置に設けることによって、水位検出筒Ａの欠
点を解決し、良好な水位制御ができる。Therefore, the low water level detector is attached to the water level detection cylinder B connecting the upper header and the lower header, and is provided at the lowest position to prevent overheating of the water pipe, thereby solving the drawback of the water level detection cylinder A, Good water level control is possible.
（実施例） 以下、図面を参照して本発明の好適な実施例を説明す
る。Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
第１図は本発明の一実施例の説明図である。図面中の
（１）は多管式貫流ボイラー、（２）は気水分離器、
（３）は上部管寄せ、（４）は下部管寄せ、（５）は水
管、（６）はその上部が気水分離器の蒸気部と連結し、
下部が下部管寄せと連結した水位検出筒Ａ、（７）は水
位検出筒Ａに付設され上限水位を検出し送信する高水位
検出器、（８）は水位検出筒Ａに付設され下限水位を検
出し送信する中水位検出器、（９）はその上部が上部管
寄せと連結し、下部が下部管寄せと連結した水位検出筒
Ｂ、（10）は水位検出筒Ｂに付設され低水位を検出し送
信する低水位検出器、（11）は水位検出筒Ｂに付設され
た水面計、（12）は蒸気を供給する蒸気弁、（13）は燃
料遮断弁、（14）は缶水の逆流を防止する逆止弁、（1
5）は給水ポンプ、（16）は制御装置で、高水位検出器
から水位検出信号を受けて給水ポンプのOFF信号を出力
し、中水位検出装置から水位不検出信号を受けて給水ポ
ンプON信号を出力し、低水位検出器から水位不検出信号
を受けて燃焼停止信号を出力する。FIG. 1 is an explanatory view of one embodiment of the present invention. In the drawing, (1) is a multi-tube once-through boiler, (2) is a steam separator,
(3) is an upper header, (4) is a lower header, (5) is a water pipe, (6) is an upper part connected to a steam part of the steam separator,
A water level detection tube A having a lower portion connected to the lower header, (7) is a high water level detector attached to the water level detection tube A to detect and transmit an upper limit water level, and (8) is attached to the water level detection tube A and lower limit water level. A middle water level detector for detecting and transmitting, (9) a water level detection tube B having an upper portion connected to the upper header and a lower portion connected to the lower header, and (10) attached to the water level detection tube B to set the low water level. (11) is a water level gauge attached to the water level detection cylinder B, (12) is a steam valve for supplying steam, (13) is a fuel cutoff valve, and (14) is can water. Check valve to prevent backflow, (1
5) is a water supply pump, and (16) is a control device. It receives a water level detection signal from the high water level detector and outputs a water supply pump OFF signal. And receives a water level non-detection signal from the low water level detector to output a combustion stop signal.
起動時には蒸気が発生していないため気水分離器と缶
内の圧力差は無く、缶内水位と水位検出筒内水位は同位
置となる。水位検出筒内の設定水位は起動時に水管過熱
を防ぐことのできる水位に設定する。Since no steam is generated at the time of startup, there is no pressure difference between the steam separator and the can, and the water level in the can and the water level in the water level detection cylinder are at the same position. The set water level in the water level detection cylinder is set to a water level that can prevent overheating of the water pipe at startup.
連続運転が行われている場合、発生した蒸気は連絡管
を通って気水分離器へ送られるが、連絡管を通過する際
の圧力損失によって気水分離器と缶内に圧力差が発生
し、圧力差が発生すると缶内水位は水位検出筒内水位に
比べ低くなる。上部管寄せと気水分離器を結ぶ連絡管口
径を適正に選定しておけば、設定水位が起動時に合わせ
て設定されていても、缶内水位は沸き上がりが大きくな
るにつれて低くなり、蒸気乾き度の低下やキャリオーバ
ーの発生を防ぎ、圧力、負荷の変化に対応した適正水位
に制御される。When continuous operation is performed, the generated steam is sent to the steam separator through the connecting pipe, but a pressure difference occurs between the steam separator and the can due to the pressure loss when passing through the connecting pipe. When the pressure difference occurs, the water level in the can becomes lower than the water level in the water level detection cylinder. If the diameter of the connecting pipe connecting the upper header and the steam separator is properly selected, even if the set water level is set at the time of start-up, the water level in the can becomes lower as the boiling rises, and the The water level is controlled to an appropriate level corresponding to changes in pressure and load, preventing a decrease in the degree and the occurrence of carryover.
（発明の効果） 続いて、本発明の効果を説明すると、気水分離器と上
部管寄せとの圧力差を利用するため、圧力、負荷の変化
に対して、一組の高水位検出器と中水位検出器で水位制
御することが可能となる。そのため水位検出筒の大型
化、水位検出器の増大を招くこと無く最適な水位制御を
行うことができる。(Effect of the Invention) Next, the effect of the present invention will be described. In order to utilize the pressure difference between the steam separator and the upper header, a set of high water level detector The water level can be controlled by the middle water level detector. Therefore, optimal water level control can be performed without increasing the size of the water level detection cylinder and increasing the number of water level detectors.
また、水位検出筒Ａのもつ水面のおどりによる缶水異
常の防止は、水位検出筒Ｂによって解決される。Further, the prevention of canned water abnormality due to the fluctuation of the water surface of the water level detection cylinder A is solved by the water level detection cylinder B.
第１図は本発明にかかわる多管式貫流ボイラーの水位制
御方法の説明図である。FIG. 1 is an explanatory diagram of a water level control method for a multi-tube once-through boiler according to the present invention.
Claims (1)
ラーにおいて、気水分離器（２）と下部管寄せ（４）と
を連結した水位検出筒Ａ（６）を設け、水位検出筒Ａ
（６）に高水位検出器（７）および中水位検出器（８）
を備え、水位検出筒Ａ（６）とは別に、上部管寄せ
（３）と下部管寄せ（４）とを連結した水位検出筒Ｂ
（９）を設け、水位検出筒Ｂ（９）に低水位検出器（1
0）を備えておき、高水位検出器（７）から水位検出信
号を受けたとき、給水ポンプのOFF信号を出力、中水位
検出器（８）から水位不検出信号を受けたとき、給水ポ
ンプON信号を出力、低水位検出器（10）から水位不検出
信号を受けたとき燃焼停止信号を出力することを特徴と
する給水制御方法。1. A multi-tube once-through boiler having a steam-water separator (2), a water level detection cylinder A (6) connecting a steam-water separator (2) and a lower header (4) is provided. Detection tube A
(6) High water level detector (7) and middle water level detector (8)
And a water level detection cylinder B that connects an upper header (3) and a lower header (4) separately from the water level detection cylinder A (6).
(9) is installed, and a low water level detector (1
0) is provided, when the water level detection signal is received from the high water level detector (7), the OFF signal of the water supply pump is output, and when the water level non-detection signal is received from the middle water level detector (8), the water supply pump is output. A water supply control method, comprising: outputting an ON signal; and outputting a combustion stop signal when receiving a water level non-detection signal from a low water level detector (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63094194A JP2610600B2 (en) | 1988-04-16 | 1988-04-16 | Water level control method for multi-tube once-through boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63094194A JP2610600B2 (en) | 1988-04-16 | 1988-04-16 | Water level control method for multi-tube once-through boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01266404A JPH01266404A (en) | 1989-10-24 |
| JP2610600B2 true JP2610600B2 (en) | 1997-05-14 |
Family
ID=14103491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63094194A Expired - Fee Related JP2610600B2 (en) | 1988-04-16 | 1988-04-16 | Water level control method for multi-tube once-through boiler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2610600B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103471080B (en) * | 2013-09-09 | 2015-05-13 | 深圳市广前电力有限公司 | Method and device for improving reliability of starting water level of heat recovery boiler of gas turbine power plant |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5531273A (en) * | 1978-08-29 | 1980-03-05 | Ishikawajima Harima Heavy Ind | Water level controller for onceethrough tubular boiler |
| JPS60111802A (en) * | 1983-11-18 | 1985-06-18 | 加藤 俊一 | Method and device for preventing superheating and corrosion of water tube for once-through type boiler |
-
1988
- 1988-04-16 JP JP63094194A patent/JP2610600B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01266404A (en) | 1989-10-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |