JP3461693B2 - Boiler bottom blower - Google Patents
Boiler bottom blowerInfo
- Publication number
- JP3461693B2 JP3461693B2 JP23331297A JP23331297A JP3461693B2 JP 3461693 B2 JP3461693 B2 JP 3461693B2 JP 23331297 A JP23331297 A JP 23331297A JP 23331297 A JP23331297 A JP 23331297A JP 3461693 B2 JP3461693 B2 JP 3461693B2
- Authority
- JP
- Japan
- Prior art keywords
- blow
- water
- boiler
- water level
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 186
- 238000007664 blowing Methods 0.000 claims description 51
- 238000002485 combustion reaction Methods 0.000 claims description 22
- 238000001514 detection method Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 description 7
- 238000005260 corrosion Methods 0.000 description 7
- 230000007423 decrease Effects 0.000 description 5
- 238000001704 evaporation Methods 0.000 description 5
- 230000008020 evaporation Effects 0.000 description 5
- 239000010802 sludge Substances 0.000 description 4
- 230000001186 cumulative effect Effects 0.000 description 3
- 238000013021 overheating Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000008400 supply water Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Landscapes
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明はボイラの缶底ブロー装置
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boiler bottom blowing device.
【０００２】[0002]
【従来の技術】ボイラは長時間の運転によって缶水中の
溶解固形物が濃縮し、缶底部にスラッジなどが堆積する
ため、缶底部より缶水を排出する缶底ブローを定期的に
行う必要がある。缶底ブロー実施時期の検出は、ボイラ
の燃焼時間を積算した燃焼積算時間が缶底ブロー周期時
間を越えるなどの条件に達すると行われ、ボイラの缶底
部に接続した缶底ブロー配管途中の缶底ブロー弁を開く
ことによって缶水の排出を行っている。2. Description of the Related Art In a boiler, dissolved solids in the can water are concentrated and sludge is accumulated on the bottom of the can after a long period of operation. Therefore, it is necessary to periodically blow the bottom of the can to discharge the can water. is there. The can bottom blow execution time is detected when conditions such as the cumulative combustion time of the boiler combustion time exceeds the can bottom blow cycle time are reached, and the can in the middle of the can bottom blow pipe connected to the can bottom of the boiler is detected. Can water is discharged by opening the bottom blow valve.
【０００３】缶底ブローを行うとボイラ内の水位は低下
し、水の無い状態で燃焼を行うとボイラを過熱すること
になる。そのため、常時運転を行っているボイラであっ
ても缶底ブロー実施時にはボイラを停止しなければなら
ず、常に蒸気を必要としている装置の場合、缶底ブロー
に要する時間は短時間であっても、その間に蒸気不足を
招くという問題があった。また、ボイラは缶水による腐
食を防止するために給水に薬品を注入しており、腐食防
止のためには缶水のｐＨを１１．０〜１１．８に濃縮さ
せ、缶水温度は脱酸素剤等の薬品の効果が得られる６０
℃以上に保つことが望ましい。しかし、缶底ブローを行
うと缶水は濃縮されていない低温の給水に入れ替わり、
薬品の濃縮度や缶水温度が低下するために腐食が発生す
るという問題があった。When the bottom of the can is blown, the water level in the boiler is lowered, and when burning is done without water, the boiler is overheated. Therefore, even if the boiler is always operating, the boiler must be stopped when performing can bottom blowing, and in the case of a device that always requires steam, the time required for can bottom blowing is short. In the meantime, there was a problem of causing steam shortage. In addition, the boiler injects chemicals into the water supply to prevent corrosion due to canned water. To prevent corrosion, the pH of the canned water is concentrated to 11.0 to 11.8, and the canned water temperature is deoxidized. The effect of chemicals such as agents can be obtained 60
It is desirable to keep above ℃. However, when the can bottom is blown, the can water is replaced with unconcentrated cold water,
There has been a problem that corrosion occurs because the concentration of chemicals and the temperature of can water decrease.
【０００４】[0004]
【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、缶底ブロー実施時にボイラを停止する必要
が無く、缶水のｐＨや温度が下限値以下に低下すること
を防止することのできる缶底ブロー装置を提供すること
にある。The problem to be solved by the present invention is to prevent the pH and temperature of the can water from falling below the lower limit value without the need to stop the boiler when the can bottom is blown. It is to provide a can bottom blowing device capable of performing.
【０００５】[0005]
【課題を解決するための手段】燃焼装置による燃焼によ
って缶水を加熱することで蒸気を発生させ、缶内水位を
検出する水位検出装置によって検出した水位に応じて給
水を制御しており、缶底ブロー制御装置はボイラの燃焼
が一定量に達するごとに缶底ブローの実施時期であるこ
とを出力し、ボイラ底部に接続した缶底ブロー配管途中
の缶底ブロー弁を開くことで缶底ブローを行うボイラで
あって、水位検出装置にて検出している缶内水位の情報
を缶底ブロー制御装置に入力可能とし、缶底ブロー制御
装置にタイマー装置を接続しておき、缶底ブロー制御装
置は缶底ブロー実施時缶内水位が所定の水位Ｅ１以上で
あることを確認後缶底ブロー弁を開いて缶底ブローを開
始するとともに缶底ブロー弁の開時間を実際分割開時間
として測定を開始し、缶内水位が水位Ｅ１より低位の水
位Ｅ２未満となるか、または実際分割開時間が予め定め
ておいた設定分割開時間以上となると缶底ブロー弁を閉
じて缶底ブローを中断し、水位がＥ１以上となったこと
を確認後に缶底ブローの再開を繰り返すことで缶底ブロ
ーを分割して行い、また実際分割開時間を積算すること
で実際トータル開時間を算出し、実際トータル開時間が
予め定めておいた設定トータル開時間以上となると缶底
ブローを終了する。[Means for Solving the Problems] By heating can water by combustion by a combustion device, steam is generated, and water supply is controlled according to the water level detected by a water level detection device that detects the water level in the can. The bottom blow control device outputs that it is time to blow the bottom of the can each time the boiler combustion reaches a certain amount, and the bottom of the can is blown by opening the can bottom blow valve connected to the bottom of the boiler. It is a boiler that performs water level detection, and the information on the water level inside the can detected by the water level detection device can be input to the can bottom blow control device, and a timer device is connected to the can bottom blow control device to control the can bottom blow. The device opens the can bottom blow valve after confirming that the water level inside the can is equal to or higher than the predetermined water level E1 when the can bottom blow is performed, and starts the can bottom blow, and measures the opening time of the can bottom blow valve as the actual divided opening time. Start , When the water level in the can is lower than the water level E1 which is lower than the water level E1, or when the actual split opening time exceeds the preset split opening time, the can bottom blow valve is closed to stop the can bottom blowing and the water level Is confirmed to be E1 or more, the can bottom blow is repeated by repeatedly restarting the can bottom blow, and the actual total open time is calculated by integrating the actual divided open time, and the actual total open time is calculated. When the total open time that is set in advance exceeds the preset total opening time, the can bottom blowing is completed.
【０００６】[0006]
【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。ボイラ６は内部に環状の上部管寄せ９と下部
管寄せ１０を設け、上下の管寄せ間を水管１１で連結し
ており、ボイラ６の上部に設けた燃焼装置１４よりボイ
ラ６中心部の燃焼室１７へ向けて火炎を発生させる。下
部管寄せ１０には缶底ブロー配管１２を接続し、缶底ブ
ロー配管１２途中に電気信号によって開閉を行う缶底ブ
ロー弁１３を設け、さらに下部管寄せ１０に給水配管１
を接続し、給水配管１途中に給水ポンプ８を設ける。水
位検出装置２はボイラの蒸気部分と缶水部分のそれぞれ
に連結しており、水位Ｅ１、Ｅ２、Ｅ３での水の有無を
検出する。缶底ブロー制御装置３、給水制御装置７、燃
焼制御装置１５、タイマー装置４、積算装置５などが設
けられたボイラの各制御を行う制御装置１６は、水位検
出装置２、燃焼装置１４、缶底ブロー弁１３、給水ポン
プ８のそれぞれと接続している。DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described with reference to the drawings. The boiler 6 is provided with an annular upper header 9 and a lower header 10 inside, and a water pipe 11 is connected between the upper and lower headers, and a combustion device 14 provided on the upper part of the boiler 6 burns the central portion of the boiler 6. A flame is generated toward the chamber 17. A can bottom blow pipe 12 is connected to the lower header 10, and a can bottom blow valve 13 that opens and closes by an electric signal is provided in the middle of the can bottom blow pipe 12.
And a water supply pump 8 is provided in the middle of the water supply pipe 1. The water level detection device 2 is connected to each of the steam part and the can water part of the boiler and detects the presence or absence of water at the water levels E1, E2, E3. The control device 16 that controls the boiler provided with the can bottom blow control device 3, the water supply control device 7, the combustion control device 15, the timer device 4, the integration device 5, and the like includes a water level detection device 2, a combustion device 14, and a can. It is connected to each of the bottom blow valve 13 and the water supply pump 8.
【０００７】ボイラ内の水位は水位検出装置２で検出し
ており、水位がＥ２より低くなると給水制御装置７によ
って給水ポンプ８を稼働させることで給水が行われ、水
位がＥ１以上に上昇すると、給水制御装置７は給水ポン
プ８の稼働を停止する。缶底ブロー制御装置３と給水制
御装置７は接続されており、給水制御装置７から缶底ブ
ロー制御装置３へ給水ポンプ８の稼働状況が出力される
ことにより、缶底ブロー制御装置３はボイラの水位がど
の位置にあるかを検出することができる。また、水位が
Ｅ３未満となると給水制御装置７より燃焼制御装置１５
へ水位異常の信号が送られ、燃焼制御装置１５は過熱を
防止するために燃焼を停止する。The water level in the boiler is detected by the water level detection device 2. When the water level becomes lower than E2, the water supply control device 7 operates the water supply pump 8 to supply water, and when the water level rises to E1 or higher, The water supply control device 7 stops the operation of the water supply pump 8. The can bottom blow control device 3 and the water supply control device 7 are connected, and the water supply control device 7 outputs the operation status of the water supply pump 8 to the can bottom blow control device 3 so that the can bottom blow control device 3 is operated by the boiler. It is possible to detect the position of the water level of. Further, when the water level becomes less than E3, the water supply control device 7 causes the combustion control device 15 to
A signal indicating that the water level is abnormal is sent to the combustion control device 15, and the combustion control device 15 stops combustion in order to prevent overheating.
【０００８】ボイラの燃焼状況は燃焼制御装置１５を通
して缶底ブロー制御装置３へ送られており、缶底ブロー
制御装置３では燃焼時間の積算値である缶底ブロー用燃
焼積算時間を求める。缶底ブロー制御装置３は、缶底ブ
ロー用燃焼積算時間が予め設定しておいた缶底ブロー周
期時間を越えると缶底ブローの実施時期であることを出
力し、缶底ブローが行われる。The combustion state of the boiler is sent to the can bottom blow control device 3 through the combustion control device 15, and the can bottom blow control device 3 obtains the combustion bottom integrated combustion time which is the integrated value of the combustion time. The can bottom blow control device 3 outputs that the can bottom blowing is in progress when the combustion time for can bottom blowing exceeds the preset can bottom blowing cycle time, and the can bottom blowing is performed.
【０００９】缶底ブロー制御装置３には缶底ブロー実施
時期に行うトータルの缶底ブロー弁開時間である設定ト
ータル開時間と、分割して行う１回の缶底ブロー弁開時
間である設定分割開時間を設定しておく。設定分割開時
間はボイラ保有水量の３％〜５％の缶水を排出するのに
要する時間に設定し、設定トータル開時間は分割しなが
ら行う缶底ブローのトータルでのブロー量が下部管寄せ
の容量以上であってボイラ保有水量の半分よりも少ない
量分の缶水を排出するのに要する時間に設定する。試験
を行ったボイラでは、設定分割開時間を７秒、設定トー
タル開時間を６０秒とした。In the can bottom blow control device 3, the set total opening time, which is the total can bottom blow valve opening time performed at the can bottom blowing execution time, and the one can bottom blow valve opening time, which is divided and set once, are set. Set the split opening time. The set split open time is set to the time required to discharge 3% to 5% of the boiler's water holding capacity, and the set total open time is the total blow volume of the bottom of the can that is performed while splitting. This is set to the time required to discharge the can water in an amount equal to or larger than the capacity of the boiler and less than half the amount of water held by the boiler. In the tested boiler, the set split open time was 7 seconds and the set total open time was 60 seconds.
【００１０】下部管寄せ１０部分の缶水のｐＨおよび温
度は、給水ポンプ８を稼働させて給水を行っている間は
ｐＨおよび温度の低い水が給水されるため低下し、給水
が行われていない状態で蒸気を発生させている間は蒸発
によって缶水が濃縮するため缶水のｐＨが上昇し、蒸気
とともに持ち上がった沸騰水が上部管寄せ９から下部管
寄せ１０へ循環するため缶水温度が上昇する。The pH and temperature of the canned water in the lower head 10 part are lowered because water having a low pH and temperature is supplied while the water supply pump 8 is being operated to supply water. While steam is being generated in the absence of steam, the pH of the can water rises due to evaporation, and the pH of the can water rises. Rises.
【００１１】図２は缶底ブローの行われていない定常運
転時の缶内水位と缶水ｐＨ、缶水温度の関係を表したも
のである。通常運転時での水位の低下は蒸発によるもの
であるため、給水によって缶水ｐＨおよび缶水温度が低
下しても給水を停止している間に缶水ｐＨと缶水温度は
上昇し、缶水のｐＨおよび温度は一定の範囲内に維持す
ることができる。FIG. 2 shows the relationship between the water level in the can, the pH of the can water and the temperature of the can water during steady operation in which the can bottom is not blown. Since the water level drop during normal operation is due to evaporation, even if the can water pH and the can water temperature decrease due to water supply, the can water pH and the can water temperature rise while the water supply is stopped. The pH and temperature of water can be maintained within certain ranges.
【００１２】図４は缶底ブロー実施時期に水位がＥ１ま
で上昇した時に缶底ブローを開始し、水位がＥ２まで低
下すると缶底ブローを停止して給水を行うようにしてい
る場合の缶内水位と缶水ｐＨ、缶水温度の関係を表した
ものである。この場合、水位がＥ２より低い時には缶底
ブローを行わないので過熱の恐れが無く、ボイラを停止
せずに缶底ブローを行うことができる。しかし、缶底ブ
ロー弁１３を開き、缶底ブロー配管より缶水を排出する
場合、蒸発による水位低下よりもブローによる水位低下
の方が大きく、その分給水ポンプ８が頻繁に稼働するこ
ととなるため、蒸発による缶水の濃縮や沸騰水の循環に
よる水温の上昇よりも給水による缶水の希釈や温度の低
下の方が大きくなり、缶底ブロー実施中に缶水のｐＨ及
び温度が大きく低下する。そして缶水のｐＨおよび温度
がｐＨ下限値および水温下限値以下となると下部管寄せ
１０内で腐食が発生する。FIG. 4 shows the inside of the can when the can bottom blowing is started when the water level rises to E1 and the can bottom blow is stopped to supply water when the water level drops to E2. It shows the relationship between water level, can water pH, and can water temperature. In this case, the can bottom is not blown when the water level is lower than E2, so there is no risk of overheating, and the can bottom can be blown without stopping the boiler. However, when the can bottom blow valve 13 is opened and the can water is discharged from the can bottom blow pipe, the water level lowering due to the blow is larger than the water level lowering due to the evaporation, and the water supply pump 8 is frequently operated accordingly. Therefore, dilution of the canned water due to water supply and lowering of the temperature are greater than concentration of the canned water due to evaporation and circulation of boiling water, which greatly reduces the pH and temperature of the canned water during can bottom blowing. To do. Then, when the pH and temperature of the canned water become equal to or lower than the lower limit of pH and the lower limit of water temperature, corrosion occurs in the lower header 10.
【００１３】しかし、図３のように一度に行われる缶底
ブロー量を適正量とすると、缶水のｐＨや温度が下限値
以下に低下することを防止できる。缶底ブロー制御装置
３は給水ポンプ８を停止している時に缶底ブロー弁１３
を開いて缶底ブローを開始し、缶底ブロー弁１３を開い
ている時間を実際分割開時間としてタイマー装置４にて
計測する。また、タイマー装置４にて計測している実際
分割開時間は積算装置５へ入力されており、積算装置５
にて実際分割開時間の積算値である実際トータル開時間
を算出している。缶底ブロー実施中に缶内水位が低下
し、水位が給水開始水位Ｅ２未満となるか、または計測
している実際分割開時間が設定分割開時間に達すると缶
底ブロー制御装置３は缶底ブロー弁１３を一旦閉じ、缶
底ブローを中断する。通常は水位がＥ２まで低下するよ
りも実際分割開時間が設定分割開時間に達する方が早
く、その後水位が給水開始水位Ｅ２未満となると、給水
制御装置７は給水ポンプ８の作動を開始する。また、給
水制御装置７から缶底ブロー制御装置３へ給水ポンプ稼
働の信号が出力される。However, if the can bottom blowing amount performed at one time as shown in FIG. 3 is set to an appropriate amount, it is possible to prevent the pH and temperature of the can water from falling below the lower limit values. The can bottom blow control device 3 controls the can bottom blow valve 13 when the water supply pump 8 is stopped.
Is opened to start the can bottom blowing, and the time during which the can bottom blowing valve 13 is opened is measured by the timer device 4 as the actual divided opening time. In addition, the actual divided opening time measured by the timer device 4 is input to the integrating device 5,
Calculates the actual total opening time, which is the integrated value of the actual divided opening times. When the water level inside the can drops during the can bottom blowing and the water level becomes less than the water supply start water level E2, or when the actual split open time being measured reaches the set split open time, the can bottom blow control device 3 The blow valve 13 is once closed to stop the can bottom blowing. Normally, the actual divided opening time reaches the set divided opening time earlier than the water level decreases to E2, and when the water level becomes lower than the water supply starting water level E2, the water supply control device 7 starts the operation of the water supply pump 8. Further, a signal for operating the water supply pump is output from the water supply control device 7 to the can bottom blow control device 3.
【００１４】給水ポンプ８の作動により缶内水位が上昇
し、水位が給水停止水位Ｅ１以上となると、給水制御装
置７は給水ポンプ８の作動を停止し、給水制御装置７か
ら缶底ブロー制御装置３へ給水ポンプ停止の信号が出力
され、缶底ブロー制御装置３では缶底ブロー弁１３を再
び開くとともに、タイマー装置４による缶底ブロー実施
時間の計測を開始して缶底ブローを再開し、以下同様に
繰り返す。When the water level in the can rises due to the operation of the water supply pump 8 and the water level becomes equal to or higher than the water supply stop water level E1, the water supply control device 7 stops the operation of the water supply pump 8 and the water supply control device 7 causes the can bottom blow control device. A signal for stopping the water supply pump is output to 3, the can bottom blow control device 3 reopens the can bottom blow valve 13, and the timer device 4 starts measuring the can bottom blow execution time to restart the can bottom blow, The same is repeated thereafter.
【００１５】積算装置５では 実際トータル開時間と設
定トータル開時間の比較を行い、実際トータル開時間が
設定トータル開時間よりも大きくなると缶底ブロー実施
時期の出力を終了して缶底ブローを終了し、実際トータ
ル開時間および缶底ブロー用燃焼積算時間の値をリセッ
トする。In the integrating device 5, the actual total opening time is compared with the set total opening time. When the actual total opening time becomes larger than the set total opening time, the output of the can bottom blowing execution time is finished and the can bottom blowing is finished. Then, the values of the actual total opening time and the cumulative combustion time for can bottom blowing are reset.
【００１６】一回の給水ポンプ停止中における水位変化
は、缶底ブローによる水位低下が少なくなった分蒸発に
よる水位低下の割合が多くなり、蒸発による水位低下の
場合には缶水の濃縮と温度上昇をともなうため、缶底ブ
ロー量が適正であれば缶底ブローを実施しても缶水のｐ
Ｈや温度が大きく低下することを防止できる。The change in water level during one stop of the water supply pump increases the rate of decrease in water level due to evaporation due to the decrease in water level due to bottom blowing of the can. As the can bottom is blown, if the can bottom blowing amount is appropriate, the p
It is possible to prevent the H and the temperature from significantly lowering.
【００１７】給水制御装置７は水位がＥ２未満となると
給水ポンプの稼働を出力するものであるため、給水ポン
プの稼働を停止している時の缶内水位はＥ２以上であ
り、その間は缶底ブローを行ってもボイラが過熱される
恐れはない。給水ポンプ８の発停状況を缶底ブロー制御
装置３に入力することにより、缶内水位の情報が缶底ブ
ロー制御装置３へ間接的に入力されることとなり、水位
が十分にあることが確認できる場合のみに缶底ブローを
行えるように缶底ブローを分割して行うことでボイラを
停止しなくても安全に缶底ブローが行える。Since the water supply control device 7 outputs the operation of the water supply pump when the water level becomes less than E2, the water level in the can when the operation of the water supply pump is stopped is E2 or more, and the bottom of the can during that time. There is no danger of overheating the boiler even if blown. By inputting the start / stop status of the water supply pump 8 to the can bottom blow control device 3, information on the water level in the can is indirectly input to the can bottom blow control device 3, and it is confirmed that the water level is sufficient. Can bottom blowing can be performed safely without breaking the boiler by dividing the can bottom blowing so that the can bottom blowing can be performed only when possible.
【００１８】ブロー量が多いと缶水のｐＨや温度が低下
して腐食を招き、ブロー量が少ないと缶底のスラッジ等
を十分に排出することができないため、ブロー量は適切
な量とする必要がある。そこで前記のように設定するこ
とでブロー量が適正量となり、缶水のｐＨが１１．０を
下回ったり缶水の温度が６０℃を下回って腐食を発生す
ることを防止でき、スラッジ等の排出も行える。If the blowing amount is large, the pH and temperature of the can water are lowered, which causes corrosion, and if the blowing amount is small, the sludge and the like at the bottom of the can cannot be sufficiently discharged. Therefore, the blowing amount should be an appropriate amount. There is a need. Therefore, by setting as described above, it is possible to prevent the occurrence of corrosion when the pH of the can water falls below 11.0 or the temperature of the can water falls below 60 ° C, and the discharge amount of sludge, etc. Can also be done.
【００１９】また、図示はしていないが缶底ブロー弁１
３の開時間を測定するタイマー装置４の代わりに缶底ブ
ロー配管１２より排出されるブロー水量を測定するブロ
ー水量計を設けておき、ブロー水量によって缶底ブロー
を行ってもよい。その場合も前記と同様であって、缶底
ブロー制御装置３は給水ポンプ８を停止している時に缶
底ブロー弁１３を開いて缶底ブローを開始し、缶底ブロ
ー弁１３を開くことで排出されるブロー水量を実際分割
ブロー量としてブロー水量計にて計測する。また、ブロ
ー水量計にて計測している実際分割ブロー量は積算装置
５へ入力されており、積算装置５にて実際分割ブロー量
の積算値である実際トータルブロー量を算出する。缶底
ブロー実施中に缶内水位が低下し、水位が給水開始水位
Ｅ２未満となるか実際分割ブロー量が設定分割ブロー量
に達すると缶底ブロー制御装置３は缶底ブロー弁１３を
一旦閉じ、缶底ブローを中断する。その後水位が給水開
始水位Ｅ２未満となると、給水制御装置７は給水ポンプ
８の作動を開始する。Although not shown, the can bottom blow valve 1
Instead of the timer device 4 for measuring the opening time of 3, the blow water meter for measuring the amount of blow water discharged from the can bottom blow pipe 12 may be provided and the can bottom may be blown by the blow water amount. In that case as well, the can bottom blow control device 3 opens the can bottom blow valve 13 to start the can bottom blow when the water supply pump 8 is stopped, and opens the can bottom blow valve 13. Measure the amount of blow water discharged as the actual divided blow amount with a blow water meter. The actual divided blow amount measured by the blow water amount meter is input to the integrating device 5, and the integrating device 5 calculates the actual total blow amount which is the integrated value of the actual divided blow amount. The can bottom blow control device 3 once closes the can bottom blow valve 13 once the can bottom water level drops during the can bottom blowing and the water level becomes less than the water supply start water level E2 or the actual divided blow amount reaches the set divided blow amount. , Stop the bottom blowing. After that, when the water level becomes lower than the water supply start water level E2, the water supply control device 7 starts the operation of the water supply pump 8.
【００２０】給水ポンプ８の作動により缶内水位が上昇
し、水位が給水停止水位Ｅ１以上となると、給水制御装
置７は給水ポンプ８の作動を停止し、給水制御装置７か
ら缶底ブロー制御装置３へ給水ポンプ停止の信号が出力
される。缶底ブロー制御装置３では缶底ブロー弁１３を
再び開くとともに、ブロー水量計による缶底ブロー実施
量の計測を開始して缶底ブローを再開し、以下同様に繰
り返す。積算装置５では実際トータルブロー量と設定ト
ータルブロー量の比較を行い、実際トータルブロー量が
設定トータルブロー量よりも大きくなると缶底ブロー実
施時期の出力を終了して缶底ブローを終了し、実際トー
タルブロー量および缶底ブロー用燃焼積算時間の値をリ
セットする。When the water level in the can rises due to the operation of the water supply pump 8, and the water level becomes equal to or higher than the water supply stop water level E1, the water supply control device 7 stops the operation of the water supply pump 8 and the water supply control device 7 causes the can bottom blow control device. A signal for stopping the water supply pump is output to 3. In the can bottom blowing control device 3, the can bottom blowing valve 13 is opened again, the measurement of the can bottom blowing execution amount by the blow water meter is started, the can bottom blowing is restarted, and so on. The accumulator 5 compares the actual total blow amount with the set total blow amount, and when the actual total blow amount becomes larger than the set total blow amount, the output of the can bottom blow execution time is ended and the can bottom blow is ended. Reset the values of total blow amount and combustion cumulative time for bottom blowing.
【００２１】なお、設定分割ブロー量はボイラ保有水量
の３〜５％、設定トータルブロー量は下部管寄せの容量
以上であってボイラの保有水量の半分よりも少ない量に
設定する。The set divided blow amount is set to 3 to 5% of the boiler retained water amount, and the set total blow amount is set to a value not less than the capacity of the lower heading and less than half of the boiler retained water amount.
【００２２】[0022]
【発明の効果】本発明を実施することで、缶底部に堆積
したスラッジ等の排出をボイラを停止させずに行うこと
ができるようになり、ボイラを停止する必要がないの
で、ボイラを停止することで発生していた蒸気不足を防
ぐことができる。また、分割して行うブロー量とトータ
ルのブロー量をそれぞれ定めることで缶水のｐＨや温度
が下限値以下に低下して腐食が発生することを防止でき
る。By implementing the present invention, it becomes possible to discharge the sludge accumulated on the bottom of the can without stopping the boiler, and it is not necessary to stop the boiler, so the boiler is stopped. This can prevent the steam shortage that has occurred. In addition, it is possible to prevent the occurrence of corrosion by lowering the pH or temperature of the can water below the lower limit value by determining the blow amount to be divided and the total blow amount.
【図１】 本発明を実施するボイラの構成図FIG. 1 is a configuration diagram of a boiler that implements the present invention.
【図２】 定常運転時の水位と缶水のｐＨおよび温度の
状況説明図FIG. 2 is an explanatory diagram of the water level and the pH and temperature of the can water during steady operation.
【図３】 本発明での缶底ブロー実施時期での水位と缶
水のｐＨおよび温度の状況説明図FIG. 3 is an explanatory view of the water level and the pH and temperature of the can water at the time of carrying out the can bottom blowing in the present invention.
【図４】 缶底ブローを水位のみに基づいて行った場合
の水位と缶水のｐＨおよび温度の状況説明図FIG. 4 is an explanatory view of the water level and the pH and temperature of the can water when the can bottom is blown based on only the water level.
２ 水位検出装置 ３ 缶底ブロー制御装置 ４ タイマー装置 ５ 積算装置 ７ 給水制御装置 １２ 缶底ブロー配管 １３ 缶底ブロー弁 2 Water level detector 3 Can bottom blow control device 4 timer device 5 integrating device 7 Water supply control device 12 Can bottom blow piping 13 Can bottom blow valve
フロントページの続き (56)参考文献 特開 平８−159405（ＪＰ，Ａ) 特開 昭53−65502（ＪＰ，Ａ) 特開 昭63−183303（ＪＰ，Ａ) 実開 平４−33812（ＪＰ，Ｕ) 実開 平１−170804（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F22B 37/56 Continuation of the front page (56) Reference JP-A-8-159405 (JP, A) JP-A-53-65502 (JP, A) JP-A-63-183303 (JP, A) Jitsukaihei 4-33812 (JP , U) Actual Kaihei 1-170804 (JP, U) (58) Fields investigated (Int.Cl. 7 , DB name) F22B 37/56
Claims (4)
て検出した水位に応じて給水を制御し、燃焼装置による
燃焼によって缶水を加熱することで蒸気を発生している
ボイラであって、ボイラの燃焼が一定量に達するごとに
缶底ブローの実施時期であることを出力し、ボイラ底部
に接続した缶底ブロー配管途中の缶底ブロー弁を開くこ
とで缶底ブローを行う缶底ブロー制御装置を設けている
ボイラにおいて、缶底ブロー制御装置は、水位検出装置
にて検出している缶内水位の情報を入力可能とするとと
もに、タイマー装置を接続しておき、缶底ブロー制御装
置は、缶底ブローを実施する場合、缶内水位が所定の水
位Ｅ１以上であることを確認した後で、缶底ブロー弁を
開いて缶底ブローを開始するとともに缶底ブロー弁の開
時間を実際分割開時間として測定を開始しておき、缶内
水位が水位Ｅ１より低位の水位Ｅ２未満となるか、また
は実際分割開時間が予め定めておいた設定分割開時間以
上となると缶底ブロー弁を閉じて缶底ブローを中断し、
水位がＥ１以上となったことを確認後に缶底ブローの再
開を繰り返すことで缶底ブローを分割して行い、また実
際分割開時間を積算することで実際トータル開時間を算
出しておき、実際トータル開時間が予め定めておいた設
定トータル開時間以上となると缶底ブローを終了するこ
とを特徴とするボイラの缶底ブロー装置。1. A water level detection device for detecting the water level in a can
Control the water supply according to the water level detected by
Steam is generated by heating canned water by combustion
It is a boiler.Whenever the boiler combustion reaches a certain amount, it is output that it is time to blow the can bottom, and the can bottom blow valve connected to the bottom of the boiler is opened to open the can bottom blow valve. Is equipped with a can bottom blow control device
In the boiler, the can bottom blow control device is supposed to be able to input information on the water level inside the can detected by the water level detection device.
When a can bottom blow control device performs a can bottom blow, the can bottom blow controller opens the can bottom blow valve after confirming that the water level inside the can is equal to or higher than a predetermined water level E1. When the can bottom blow is started, the measurement is started with the opening time of the can bottom blow valve as the actual split open time , and the water level in the can becomes lower than the water level E1 which is lower than the water level E1, or the actual split open time is When it exceeds the preset split open time, the can bottom blow valve is closed and the can bottom blow is interrupted.
Water level was divided the can bottom blowing by repeating the check after the can bottom blowing resume it becomes E1 above, also leave calculate an actual total opening time by integrating the actual split open time, actual A can bottom blowing device for a boiler, wherein the can bottom blowing is terminated when the total opening time exceeds a preset total opening time.
置において、缶底ブロー制御装置にはタイマー装置の代
わりに缶底ブロー配管を通して排出されるブロー水量を
測定するブロー水量計と接続し、缶底ブロー弁の開時間
を測定する代わりにブロー水量を測定し、缶内水位とブ
ロー水量によって缶底ブローの制御を行うことを特徴と
するボイラの缶底ブロー装置。2. The boiler can bottom blowing device according to claim 1, wherein the can bottom blowing control device is connected to a blow water amount meter for measuring the amount of blow water discharged through the can bottom blowing pipe instead of the timer device. A can bottom blowing device for a boiler, wherein the amount of blow water is measured instead of measuring the opening time of the can bottom blow valve, and the can bottom blowing is controlled by the water level in the can and the amount of blow water.
の缶底ブロー装置において、分割して行う１回あたりの
ブロー量はボイラ保有水量の３％〜５％の値となるよう
に缶底ブロー弁開時間またはブロー水量を設定したこと
を特徴とするボイラの缶底ブロー装置。3. The boiler can bottom blowing device according to claim 1 or 2, wherein the blow amount per divided operation is 3% to 5% of the boiler water holding amount. A boiler bottom blowing device characterized in that the bottom blow valve opening time or the amount of blow water is set.
の缶底ブロー装置を多管式貫流ボイラに使用する場合、
缶底ブローを終了させるための積算値は下部管寄せの容
量以上であってボイラの保有水量の半分以下の値となる
ように缶底ブロー弁開時間またはブロー水量を設定する
ことを特徴とするボイラの缶底ブロー装置。4. When the can bottom blowing device for a boiler according to claim 1 or 2 is used in a multi-tube once-through boiler,
It is characterized by setting the can bottom blow valve opening time or the blow water amount so that the integrated value for ending the can bottom blowing is more than the capacity of the lower heading and less than half the amount of water held by the boiler. Boiler can bottom blowing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23331297A JP3461693B2 (en) | 1997-08-13 | 1997-08-13 | Boiler bottom blower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23331297A JP3461693B2 (en) | 1997-08-13 | 1997-08-13 | Boiler bottom blower |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1163409A JPH1163409A (en) | 1999-03-05 |
| JP3461693B2 true JP3461693B2 (en) | 2003-10-27 |
Family
ID=16953164
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23331297A Expired - Fee Related JP3461693B2 (en) | 1997-08-13 | 1997-08-13 | Boiler bottom blower |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3461693B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5916215B2 (en) * | 2012-04-03 | 2016-05-11 | 株式会社サムソン | boiler |
-
1997
- 1997-08-13 JP JP23331297A patent/JP3461693B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1163409A (en) | 1999-03-05 |
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