JP2895798B2 - Boiler corrosion detection method - Google Patents
Boiler corrosion detection methodInfo
- Publication number
- JP2895798B2 JP2895798B2 JP7833296A JP7833296A JP2895798B2 JP 2895798 B2 JP2895798 B2 JP 2895798B2 JP 7833296 A JP7833296 A JP 7833296A JP 7833296 A JP7833296 A JP 7833296A JP 2895798 B2 JP2895798 B2 JP 2895798B2
- Authority
- JP
- Japan
- Prior art keywords
- boiler
- water
- fuel
- water supply
- amount
- 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
Landscapes
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は貫流ボイラの腐食検
出方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting corrosion of a once-through boiler.
【０００２】[0002]
【従来の技術】ボイラの水管のうち、缶水に接している
内側部分は、水中の溶存酸素などによって腐食が発生す
ることがある。腐食の状態を知るには目視によって観察
するしか方法が無く、通常は観察してから次回観察を行
うまでに長い期間が開けられるため、腐食により孔が開
き、蒸気が漏れることとなっていても発見が遅れること
となり、補修を行うことができなかった。また、ボイラ
が稼働している場合には全く検出することができなかっ
た。2. Description of the Related Art In a water tube of a boiler, an inner portion of the water tube which is in contact with can water may be corroded by dissolved oxygen in the water. The only way to know the state of corrosion is to visually observe it, and usually there is a long period between observation and the next observation, so even if corrosion causes holes to open and steam leaks The discovery was delayed and repairs could not be made. Further, no detection was possible when the boiler was operating.
【０００３】[0003]
【発明が解決しようとする課題】本発明が解決しようと
する課題は、腐食により孔が開いた場合には自動的に異
常を検出し、遅延無く異常を出力することにある。An object of the present invention is to automatically detect an abnormality when a hole is opened due to corrosion and to output the abnormality without delay.
【０００４】[0004]
【課題を解決するための手段】上下に設けた管寄せの間
を水管で結ぶことで缶体を構成しており、ボイラへの燃
料供給路中に設けた燃料流量計によって燃料使用量を検
出し、ボイラへの給水路中に設けた給水流量計によって
給水量を検出している貫流ボイラにおいて、検出してい
る燃料使用量と給水量よりボイラの効率を算出し、算出
した効率値と以前に算出しておいた効率値の比較を行
い、効率値の差が設定値以上となった場合には腐食発生
として異常を出力する。また、燃焼停止中の給水量が設
定値以上となった場合にも腐食発生として異常を出力す
る。A can is constructed by connecting water pipes between upper and lower headers, and a fuel consumption is detected by a fuel flow meter provided in a fuel supply path to the boiler. In a once-through boiler that detects the amount of water supplied by a water flow meter provided in the water supply path to the boiler, the efficiency of the boiler is calculated from the detected fuel consumption and water supply, and the calculated efficiency value and The efficiency values calculated in step (1) are compared, and if the difference between the efficiency values is equal to or greater than the set value, an abnormality is output as the occurrence of corrosion. Also, when the water supply amount during the stop of combustion becomes equal to or larger than the set value, an abnormality is output as the occurrence of corrosion.
【０００５】[0005]
【発明の実施の形態】本発明の一実施例を図面を用いて
説明する。図１は本発明の一実施例の構成図、図２は一
実施例でのボイラ効率の変化を示している。環状の上部
管寄せ１と下部管寄せ２の間は多数の水管３で連結して
おき、缶体の中央部分を燃焼室４とする。上部管寄せ１
の上部には燃焼装置５が燃焼室４へ向けて設けられてお
り、ボイラの側部に設けた気水分離器６と上部管寄せ１
の間を連結管７、気水分離器６と下部管寄せ２の間を降
水管８で結ぶ。燃焼装置５への燃料供給は燃焼装置５に
接続されている燃料供給路９にて行われており、燃料供
給路９の途中に燃料使用量を検出する燃料流量計１０を
設ける。またボイラへの給水は、下部管寄せ２に接続さ
れている給水路１１によって行われており、給水路１１
の途中に給水量を検出する給水流量計１２を設ける。ボ
イラの水位は水位検出装置１４にて検出されており、検
出される水位が一定となるように制御される。ボイラの
各制御は制御装置１３にて行われており、燃料流量計１
０および給水流量計１２は制御装置１３と接続されてい
る。制御装置１３内には、燃料使用量と給水量よりボイ
ラ効率を算出する演算部、算出した効率値を記憶する記
憶部、記憶しておいた前回の効率値と新たに算出した効
率値の差を算出する比較部、効率値の差が設定値以上の
場合または燃焼停止時の給水量が設定値以上の場合に異
常を出力する出力部を設けておく。DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of one embodiment of the present invention, and FIG. 2 shows a change in boiler efficiency in one embodiment. A ring-shaped upper header 1 and a lower header 2 are connected by a number of water pipes 3, and a central portion of the can body is used as a combustion chamber 4. Upper header 1
At the top of the boiler, a combustion device 5 is provided toward the combustion chamber 4, and a steam-water separator 6 provided on a side of the boiler and an upper header 1 are provided.
Are connected by a connecting pipe 7, and the steam-water separator 6 and the lower header 2 are connected by a downcomer 8. The fuel supply to the combustion device 5 is performed in a fuel supply passage 9 connected to the combustion device 5, and a fuel flow meter 10 for detecting a fuel consumption is provided in the fuel supply passage 9. Water is supplied to the boiler through a water supply channel 11 connected to the lower header 2.
A water supply flow meter 12 for detecting the amount of water supply is provided in the middle of the process. The water level of the boiler is detected by the water level detection device 14, and is controlled so that the detected water level is constant. Each control of the boiler is performed by the control device 13, and the fuel flow meter 1
0 and the feedwater flow meter 12 are connected to the control device 13. The control unit 13 includes a calculation unit for calculating the boiler efficiency from the fuel consumption and the water supply amount, a storage unit for storing the calculated efficiency value, and a difference between the stored previous efficiency value and the newly calculated efficiency value. And an output unit that outputs an abnormality when the difference between the efficiency values is equal to or more than a set value or when the amount of water supplied at the time of stopping combustion is equal to or more than the set value.
【０００６】まず燃焼時のボイラの状態について説明す
る。給水路１１を通して給水された水は下部管寄せ２か
ら水管３へ送られ、燃料供給路９を通して供給された燃
料は燃焼装置５によって燃焼され、燃焼によって生じた
熱によって水管３が加熱される。水管３を加熱すること
で水管３内の水が沸騰して蒸気を発生し、蒸気は上部管
寄せ１、連結管７を通って気水分離器６へ送られる。気
水分離器６へ送られた蒸気は気水分離器６内で蒸気と水
分に分離されて蒸気のみボイラより取り出され、分離さ
れた水は降水管８を通して下部管寄せ２へ循環される。
蒸発によってボイラ内の水位が低下すると、制御装置１
３は水位検出装置１４からの信号によって給水を行い、
水位を一定に保つ。この時、燃料流量計１０では燃料使
用量、給水流量計１２では給水量を検出しており、燃料
使用量と給水量は制御装置１３へ送られる。制御装置１
３では一定時間ごとの燃料使用量と給水量の比よりボイ
ラ効率を算出し、該効率値を記憶するとともに、前回に
算出した効率値と今回算出した効率値の比較を行う。腐
食により孔が開くと、水管内の蒸気または水が孔より燃
焼室４内に吹き込まれ、燃焼装置５による燃焼によって
生じた熱を冷却することとなる。そのためボイラの効率
が低下し、給水量に対する燃料使用量が増大する。今回
算出した効率値が前回の効率値より設定値（例えば５
％）以上低下した場合、制御装置１３は異常の出力を行
う。First, the state of the boiler during combustion will be described. The water supplied through the water supply channel 11 is sent from the lower header 2 to the water tube 3, and the fuel supplied through the fuel supply channel 9 is burned by the combustion device 5, and the water tube 3 is heated by the heat generated by the combustion. By heating the water pipe 3, the water in the water pipe 3 boils to generate steam, and the steam is sent to the steam separator 6 through the upper header 1 and the connecting pipe 7. The steam sent to the steam separator 6 is separated into steam and moisture in the steam separator 6 and only the steam is taken out of the boiler. The separated water is circulated to the lower header 2 through the downcomer 8.
When the water level in the boiler drops due to evaporation, the control device 1
3 supplies water by a signal from the water level detection device 14,
Keep the water level constant. At this time, the fuel flow meter 10 detects the fuel consumption and the water supply flow meter 12 detects the water supply, and the fuel consumption and the water supply are sent to the control device 13. Control device 1
In step 3, the boiler efficiency is calculated from the ratio of the amount of fuel used to the amount of water supplied at regular intervals, the efficiency value is stored, and the efficiency value calculated last time is compared with the efficiency value calculated this time. When the hole is opened due to corrosion, steam or water in the water pipe is blown into the combustion chamber 4 from the hole, thereby cooling heat generated by combustion by the combustion device 5. As a result, the efficiency of the boiler is reduced, and the amount of fuel used relative to the amount of supplied water is increased. The efficiency value calculated this time is a set value (for example, 5
%) Or more, the control device 13 outputs an abnormality.
【０００７】次に燃焼停止時のボイラの状態について説
明する。燃焼を行っていない場合であっても給水流量計
１２によって給水量の検出を行っておき、検出された給
水量は制御装置１３へ送られる。燃焼を行っていない場
合には蒸気の発生が無いためボイラ内の水位は変動せ
ず、給水が行われることもない。しかし、腐食により孔
が開き、水管３内の水が漏れ出しているとボイラの水位
が低下することとなる。燃焼停止時の給水量が設定値以
上となった場合には孔が開いていたことが分かり、その
場合には制御装置１３は異常の出力を行う。なお、全ブ
ロー後の給水など正常な給水の場合には異常としないの
は当然のことである。Next, the state of the boiler when the combustion is stopped will be described. Even when combustion is not being performed, the amount of supplied water is detected by the supplied water flow meter 12, and the detected amount of supplied water is sent to the control device 13. When no combustion is being performed, there is no generation of steam, so that the water level in the boiler does not fluctuate and water is not supplied. However, if a hole is opened due to corrosion and water in the water pipe 3 leaks out, the water level of the boiler will decrease. When the water supply amount at the time of stopping the combustion is equal to or larger than the set value, it is known that the hole has been opened, and in that case, the control device 13 outputs an abnormality. In the case of normal water supply such as water supply after all blows, it is natural that no abnormality occurs.
【０００８】[0008]
【発明の効果】本発明を実施することで、腐食により孔
が開いた場合にはすぐに知ることができ、速やかに補修
を行うことで被害を最小限に止めることができる。By implementing the present invention, when a hole is opened due to corrosion, it is possible to know immediately, and by repairing it promptly, damage can be minimized.
【図１】本発明の一実施例の貫流ボイラの構成図FIG. 1 is a block diagram of a once-through boiler according to one embodiment of the present invention.
【図２】一実施例でのボイラ効率の変化を示した説明図FIG. 2 is an explanatory diagram showing a change in boiler efficiency in one embodiment.
１ 上部管寄せ ２ 下部管寄せ ３ 水管 ４ 燃焼室 ５ 燃焼装置 ６ 気水分離器 ７ 連結管 ８ 降水管 ９ 燃料供給路 １０ 燃料流量計 １１ 給水路 １２ 給水流量計 １３ 制御装置 １４ 水位検出装置 DESCRIPTION OF SYMBOLS 1 Upper header 2 Lower header 3 Water pipe 4 Combustion chamber 5 Combustion device 6 Steam separator 7 Connecting pipe 8 Downcomer 9 Fuel supply path 10 Fuel flow meter 11 Water supply path 12 Water supply flow meter 13 Control device 14 Water level detection device
Claims (2)
とで缶体を構成しており、ボイラへの燃料供給路中に設
けた燃料流量計によって燃料使用量を検出し、ボイラへ
の給水路中に設けた給水流量計によって給水量を検出し
ている貫流ボイラにおいて、検出している燃料使用量と
給水量よりボイラの効率を算出し、算出した効率値と以
前に算出しておいた効率値の比較を行い、効率値の差が
設定値以上となった場合には異常を出力することを特徴
とするボイラの腐食検出方法。1. A can body is formed by connecting upper and lower headers with water pipes, and a fuel flow meter provided in a fuel supply path to a boiler detects a fuel consumption amount and sends the fuel to a boiler. In a once-through boiler that detects the amount of water supplied by a water supply flow meter provided in the water supply channel, the efficiency of the boiler is calculated from the detected fuel consumption and the amount of water supply, and the calculated efficiency value and the previously calculated efficiency value are calculated. A method for detecting corrosion of a boiler, comprising comparing an efficiency value set and outputting an abnormality when a difference between the efficiency values exceeds a set value.
とで缶体を構成しており、ボイラへの燃料供給路中に設
けた燃料流量計によって燃料使用量を検出し、ボイラへ
の給水路中に設けた給水流量計によって給水量を検出し
ている貫流ボイラにおいて、燃焼停止中の給水量を検出
しておき、検出された給水量が設定値以上となった場合
には異常を出力することを特徴とするボイラの腐食検出
方法。2. A can body is formed by connecting upper and lower headers with a water pipe, and a fuel flow meter provided in a fuel supply path to the boiler detects a fuel consumption amount and sends the fuel to the boiler. In a once-through boiler that detects the amount of water supply with a water supply flow meter installed in the water supply channel, the amount of water supply during combustion stoppage is detected, and if the detected amount of water exceeds the set value, A method for detecting corrosion of a boiler, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7833296A JP2895798B2 (en) | 1996-03-05 | 1996-03-05 | Boiler corrosion detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7833296A JP2895798B2 (en) | 1996-03-05 | 1996-03-05 | Boiler corrosion detection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09243012A JPH09243012A (en) | 1997-09-16 |
| JP2895798B2 true JP2895798B2 (en) | 1999-05-24 |
Family
ID=13659029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7833296A Expired - Fee Related JP2895798B2 (en) | 1996-03-05 | 1996-03-05 | Boiler corrosion detection method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2895798B2 (en) |
-
1996
- 1996-03-05 JP JP7833296A patent/JP2895798B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09243012A (en) | 1997-09-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |