JPH0210327B2 - - Google Patents
Info
- Publication number
- JPH0210327B2 JPH0210327B2 JP10688381A JP10688381A JPH0210327B2 JP H0210327 B2 JPH0210327 B2 JP H0210327B2 JP 10688381 A JP10688381 A JP 10688381A JP 10688381 A JP10688381 A JP 10688381A JP H0210327 B2 JPH0210327 B2 JP H0210327B2
- Authority
- JP
- Japan
- Prior art keywords
- level
- water
- water level
- boiler
- time
- 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
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 66
- 238000001514 detection method Methods 0.000 claims description 11
- 230000000630 rising effect Effects 0.000 claims description 9
- 230000007246 mechanism Effects 0.000 claims description 8
- 238000010304 firing Methods 0.000 claims description 7
- 230000002265 prevention Effects 0.000 claims description 7
- 230000005856 abnormality Effects 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 4
- 230000004913 activation Effects 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、複数段の水位検出機構を備えた、貫
流式、水管式などのボイラの空焚き防止装置に関
するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dry-firing prevention device for a once-through type boiler, a water tube type boiler, etc., which is equipped with a multi-stage water level detection mechanism.
従来のボイラ空焚き防止にはボイラ本体に連絡
したレベルゲージ内にある複数段の水位検出機
構、例えば下端の高さがそれぞれ異なる複数本の
電極棒で水面と接触して導通信号を出すことで水
位の検出を行ない給水ポンプの停止、起動を制御
することが知られている。
Conventional boiler dry-firing prevention is achieved by using a multi-stage water level detection mechanism in a level gauge connected to the boiler body, for example, by making contact with the water surface using multiple electrode rods with different lower end heights to issue a conduction signal. It is known to detect the water level and control the stop and start of a water pump.
この従来装置では、水位検出機構のあるレベル
ゲージとボイラ本体とを接続する連絡管は通常は
細管であり、スラツジや凍結による閉塞を生ずる
おそれがあつて、ボイラ本体の水が全部蒸発して
もレベルゲージ内には水が残つており、その水位
がレベルＨ以上あるいは下降時の途中でのレベル
Ｍ以上であつた場合には給水ポンプは起動せず、
レベルＬのインターロツクも作動せず、燃焼は続
行され、その結果空焚きとなりボイラの破損事故
を招く問題点があつた。
In this conventional device, the connecting pipe that connects the level gauge with the water level detection mechanism and the boiler body is usually a thin tube, and there is a risk of clogging due to sludge or freezing, even if all the water in the boiler body evaporates. If water remains in the level gauge and the water level is above level H or above level M during the descent, the water pump will not start.
The level L interlock did not operate, and combustion continued, resulting in dry firing, which caused a problem that could lead to boiler damage.
本発明は、これら従来の欠点を除き閉塞などの
異常に基づくボイラの空焚きを予防することがで
きるボイラの空焚き防止装置を提供することを目
的とするものである。 SUMMARY OF THE INVENTION It is an object of the present invention to provide a boiler dry heating prevention device that eliminates these conventional drawbacks and can prevent boiler dry heating due to abnormalities such as blockage.
本発明は、複数段の異なる水位に対して水位信
号を発する水位検出機構を備えたボイラの空焚き
防止装置において、前記異なる水位間の収容体積
と、水位間における正常蒸発量及び正常給水量と
により求められた、水位間を水分が昇降するに要
する正常昇降時間を設定したタイマーを備え、或
る水位間にて起動した後、当該水位間に対する前
記正常昇降時間を経過しても、所定の水位信号が
発せられていない場合に異常と判定して注意信号
を発するよう構成されていることを特徴とするボ
イラの空焚き防止装置である。
The present invention provides a dry firing prevention device for a boiler equipped with a water level detection mechanism that issues water level signals for different water levels in a plurality of stages. The timer is equipped with a timer that is set to the normal rising and falling time required for moisture to rise and fall between water levels, as determined by This boiler dry heating prevention device is characterized in that it is configured to determine that there is an abnormality and issue a caution signal when a water level signal is not issued.
〔実施例〕
本発明の実施例を貫流式ボイラの例につき説明
する。第１図においてボイラは、煙管２を内蔵す
る水管１を内装してあり、内側に燃焼室３が、外
に煙道４が形成されている。５は上ヘツダ、６は
下ヘツダ、７は給水ポンプ、８は吹出管、９は蒸
気管である。下ヘツダ６の下部と、上ヘツダ５の
上部とを接続して、連絡管１０が設けられ、その
途中にレベルゲージ１１が並列又は直列（図は並
列）に設けられている。[Example] An example of the present invention will be described using an example of a once-through boiler. In FIG. 1, the boiler is equipped with a water pipe 1 containing a smoke pipe 2, a combustion chamber 3 on the inside, and a flue 4 on the outside. 5 is an upper header, 6 is a lower header, 7 is a water supply pump, 8 is a blowout pipe, and 9 is a steam pipe. A communication pipe 10 is provided to connect the lower part of the lower header 6 and the upper part of the upper header 5, and a level gauge 11 is provided in parallel or in series (parallel in the figure) in the middle.
レベルゲージ１１の中には、第２図にて示すよ
うに、下端の高さがそれぞれ異なる４本の電極棒
１２，１３，１４，１５にて形成された水位検出
端１６があり、水面と接触して導通信号を出すこ
とにより水位を検出する水位検出機構の検出端と
なつている。この設定水位は
レベルＨ…水位上昇時このレベルを越えたら給水
ポンプ７を停止する。 Inside the level gauge 11, as shown in FIG. 2, there is a water level detection end 16 formed by four electrode rods 12, 13, 14, 15 whose lower ends have different heights, and which are connected to the water surface. It serves as the detection end of a water level detection mechanism that detects the water level by making contact and emitting a conductive signal. This set water level is level H...When the water level rises and exceeds this level, the water supply pump 7 is stopped.
レベルＭ…水位下降時、このレベルより下がつた
ら給水ポンプ７を起動する。Level M: When the water level falls below this level, the water supply pump 7 is started.
レベルＬ…このレベル以上のときに燃焼を行な
う。Level L: Combustion is performed when the level is higher than this level.
レベルＣ…基準レベルとする。Level C...Reference level.
となつている。It is becoming.
そして、これら設定水位間の行程を正常な速度
で水位が上昇又は下降するに要する時間を設定し
たタイマーを備え、起動後設定時間を経過しても
次に設定水位に達した信号が発せられないときに
異常信号を発するように構成してある。 It is equipped with a timer that sets the time required for the water level to rise or fall at a normal speed during the journey between these set water levels, and a signal indicating that the set water level has been reached will not be emitted even after the set time elapses after startup. It is configured to occasionally issue an abnormal signal.
この場合、停止しているボイラの水位が例えば
レベルＨとレベルＭとの間にあつた場合、ボイラ
を起動せしめれば、給水ポンプ７は停止したまま
で、燃焼のみがスタートする。この起動状態にお
けるレベルＨとレベルＭ間の水位の正常昇降時間
（この場合は正常下降時間）TH-Mは、レベルＨと
レベルＭとの間の体積をVH-M、最大蒸発能力を
Wnaxとするとき、
TH-M＝VH-M／Wnax
として算出し、この時間で予めタイマーを設定
し、ボイラの起動と共にタイマーも起動せしめ
る。もし、前記連絡管１０の閉塞などがなけれ
ば、水位が下がると共にレベルゲージ１１内の水
位も下がり、遅くともTH-M時間後には水位はＭ
レベルに達する筈である。従つて起動後、同時に
起動せしめたタイマーがTH-M時間の経過を示し
てもレベルＭよりも下がつた信号（下降時は導通
のOFF信号）が発せられない（導通信号がなく
ならない）場合には、異常であるとみなして「空
焚き」警報を出して燃焼を停止せしめる。 In this case, if the water level of the stopped boiler is, for example, between level H and level M, if the boiler is started, only combustion will start while the water pump 7 remains stopped. The normal rise and fall time of the water level between level H and level M in this startup state (normal fall time in this case) T HM is the volume between level H and level M, V HM is the maximum evaporation capacity.
When W nax , T HM = V HM /W nax is calculated, a timer is set in advance using this time, and the timer is started at the same time as the boiler is started. If the connecting pipe 10 is not blocked, the water level will drop and the water level in the level gauge 11 will also drop, and the water level will reach M at the latest after T HM time.
It should reach the level. Therefore, even if the timer activated at the same time indicates the elapse of the THM time after activation, a signal that has fallen below level M (a conduction OFF signal when falling) is not emitted (the conduction signal does not disappear). It is assumed that there is an abnormality and a "dry firing" alarm is issued to stop combustion.
また、水位がレベルＭとレベルＬとの間にある
状態で起動した場合には給水ポンプ７も、燃焼も
スタートする。これに対する水位の正常昇降時間
（この場合正常上昇時間）TM-Lは、レベルＭとレ
ベルＬ間の体積をVM-L、給水ポンプ７の吐出量
をＱとするとき、
TM-L＝VM-L／Ｑ−Wnax
として算出し、この時間でタイマーを設定する。
ボイラ起動時にタイマーも起動せしめ、TM-L時
間経過後にも、水位がレベルＭに達しない場合に
は、「水位計まわり異常・空焚きに至る可能性あ
り」の警報を出す。 Moreover, when the water level is started in a state between level M and level L, the water supply pump 7 and combustion also start. The normal rise and fall time for the water level (normal rise time in this case) T ML for this is defined as T ML = V ML /Q-, where V ML is the volume between level M and level L, and Q is the discharge amount of the water supply pump 7. Calculate as W nax and set the timer with this time.
A timer is also activated when the boiler is started, and if the water level does not reach level M even after T ML time has elapsed, a warning will be issued stating that there is an abnormality around the water level gauge and there is a possibility of dry firing.
レベルＬとレベルＨとの間の正常昇降時間（こ
の場合は正常上昇時間）TH-Lを、レベルＬとレ
ベルＨとの間の体積をVH-Lとするとき、
TH-L＝VL-H／Ｑ−Wnax
で求め、これをタイマーに設定し、TH-L時間後
でもレベルＨに達していないときに警報を出すよ
うにしてもよい。 When the normal rising/lowering time between level L and level H (in this case normal rising time) T HL is the volume between level L and level H is V HL , then T HL = V LH /Q-W It is also possible to obtain this using nax , set this to a timer, and issue an alarm when level H has not been reached even after the THL time.
また、水位がレベルＬ以下である状態で起動し
た場合、給水ポンプ７は起動するが燃焼は行なわ
れない。このときの正常昇際時間（この場合は正
常上昇時間）TO-Lを、貯留水量ゼロからレベル
Ｌまでの体積をVL-Oとするとき、
TL-O＝VL-O／Ｑ
で求め、これをタイマーに設定し、TL-O時間後
でも水位がレベルＬに達していないときに警報を
発するようにしてもよい。 Furthermore, when the water level is started when the water level is below level L, the water supply pump 7 is started, but no combustion occurs. The normal rising time (normal rising time in this case) T OL at this time is calculated as T LO = V LO /Q, where the volume from the amount of stored water from zero to level L is V LO , and this is set in the timer. However, an alarm may be issued when the water level has not reached level L even after the TLO time.
この例では貫流ボイラの例を示したが、水管式
など他の形式のボイラにおいても適用できる。 Although this example shows a once-through boiler, it can also be applied to other types of boilers such as water tube type.
前記水位検出機構としては電極棒式の他、フロ
ートスイツチ式、光電管式、無接点式など公知の
種々のものが用いられる。 As the water level detection mechanism, various known mechanisms such as an electrode rod type, a float switch type, a phototube type, and a non-contact type can be used.
「発明の効果」
本発明は異なる水位間の収容体積と、水位間に
おける正常蒸発量及び正常給水量とにより求めら
れた、水位記を水位が昇降するに要する正常昇降
時間を設定したタイマーを備え、或る水位間にて
起動した後、当該水位間に対する前記正常昇降時
間を経過しても、所定の水位信号が発せられてい
ない場合に異常と判定して注意信号を発するよう
構成されていることにより、レベルゲージへの導
通路の閉塞などによるレベルゲージの誤表示のた
めに起こるボイラの空焚きを確実に防止すること
ができボイラの破損事故がなく安全に運転するこ
とができ、保守保守も簡便化できる効果がある。"Effects of the Invention" The present invention is equipped with a timer that sets the normal rising and falling time required for the water level to rise and fall based on the storage volume between different water levels and the normal evaporation amount and normal water supply amount between the water levels. , after starting between a certain water level, if a predetermined water level signal is not emitted even after the normal rising/lowering time for the water level has elapsed, it is configured to determine that there is an abnormality and issue a caution signal. By doing so, it is possible to reliably prevent the boiler from running dry due to incorrect display of the level gauge due to blockage of the conduit to the level gauge, etc., and to ensure safe operation without any accidental damage to the boiler. It also has the effect of simplifying the process.
第１図は本発明の一実施例の貫流ボイラの断面
図、第２図は水位検出端の説明図である。
１……水管、２……煙管、３……燃焼室、４…
…煙道、５……上ヘツダ、６……下ヘツダ、７…
…給水ポンプ、８……吹出管、９……蒸気管、１
０……連絡管、１１……レベルゲージ、１２……
電極棒、１３……電極棒、１４……電極棒、１５
……電極棒、１６……水位検出端。
FIG. 1 is a sectional view of a once-through boiler according to an embodiment of the present invention, and FIG. 2 is an explanatory view of a water level detection end. 1... Water pipe, 2... Smoke pipe, 3... Combustion chamber, 4...
... Flue, 5... Upper header, 6... Lower header, 7...
...Water pump, 8...Blowout pipe, 9...Steam pipe, 1
0...Connection pipe, 11...Level gauge, 12...
Electrode rod, 13... Electrode rod, 14... Electrode rod, 15
... Electrode rod, 16 ... Water level detection end.
Claims (1)
る水位検出機構を備えたボイラの空焚き防止装置
において、前記異なる水位間の収容体積と、水位
間における正常蒸発量及び正常給水量とにより求
められた、水位間を水位が昇降するに要する正常
昇降時間を設定したタイマーを備え、或る水位間
にて起動した後、当該水位間に対する前記正常昇
降時間を経過しても、所定の水位信号が発せられ
ていない場合に異常と判定して注意信号を発する
よう構成されていることを特徴とするボイラの空
焚き防止装置。1. In a boiler dry firing prevention device equipped with a water level detection mechanism that issues water level signals for different water levels in multiple stages, In addition, a timer is provided that sets the normal rising/lowering time required for the water level to rise and fall between water levels, and even if the normal rising/lowering time for the water level has elapsed after activation between certain water levels, the predetermined water level signal is not output. A boiler dry heating prevention device characterized in that it is configured to determine that there is an abnormality and issue a caution signal when no warning signal is issued.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10688381A JPS588904A (en) | 1981-07-10 | 1981-07-10 | Preventive device for empty boiling of boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10688381A JPS588904A (en) | 1981-07-10 | 1981-07-10 | Preventive device for empty boiling of boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS588904A JPS588904A (en) | 1983-01-19 |
| JPH0210327B2 true JPH0210327B2 (en) | 1990-03-07 |
Family
ID=14444891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10688381A Granted JPS588904A (en) | 1981-07-10 | 1981-07-10 | Preventive device for empty boiling of boiler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS588904A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8400665D0 (en) * | 1984-01-11 | 1984-02-15 | Secr Defence | Disubstituted ethanes |
| JPH0612328Y2 (en) * | 1985-01-11 | 1994-03-30 | 三浦工業株式会社 | Blow device erroneous operation detection device |
| JPH055984Y2 (en) * | 1988-09-06 | 1993-02-16 | ||
| JPH0321609U (en) * | 1989-06-30 | 1991-03-05 | ||
| JP2008258239A (en) * | 2007-04-02 | 2008-10-23 | Densei Lambda Kk | Bobbin for winding wire |
-
1981
- 1981-07-10 JP JP10688381A patent/JPS588904A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS588904A (en) | 1983-01-19 |
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