JP3121172B2 - Multi-tube once-through boiler - Google Patents
Multi-tube once-through boilerInfo
- Publication number
- JP3121172B2 JP3121172B2 JP05101308A JP10130893A JP3121172B2 JP 3121172 B2 JP3121172 B2 JP 3121172B2 JP 05101308 A JP05101308 A JP 05101308A JP 10130893 A JP10130893 A JP 10130893A JP 3121172 B2 JP3121172 B2 JP 3121172B2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- boiler
- pressure
- water
- economizer
- 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 - Lifetime
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- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ボイラ本体からの排ガ
スでボイラ本体への給水を加熱するエコノマイザを有す
る多管式貫流ボイラに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-tube once-through boiler having an economizer for heating water supplied to a boiler body with exhaust gas from the boiler body.
【０００２】[0002]
【従来の技術】多管式貫流ボイラにおいては、ボイラ本
体からの排ガスを利用してエコノマイザで加熱した水を
ボイラ本体に給水し、熱効率の向上を図っている。2. Description of the Related Art In a multi-tube once-through boiler, water heated by an economizer is supplied to a boiler body using exhaust gas from the boiler body to improve thermal efficiency.
【０００３】[0003]
【発明が解決しようとする課題】このような装置でボイ
ラ本体の負荷が少ない時には、ボイラ本体から排出され
る排ガス量も少なくなるため、エコノマイザでの給水加
熱により、エコノマイザに導入された排ガスの温度が急
に低くなって、エコノマイザ出口での排ガス温度が酸露
点温度以下に下がり、エコノマイザ内部の管の腐食等の
低温腐食が起こって、エコノマイザの寿命が短くなる欠
点があった。When the load on the boiler main body is small in such an apparatus, the amount of exhaust gas discharged from the boiler main body also decreases. Therefore, the temperature of the exhaust gas introduced into the economizer by heating the feedwater with the economizer is reduced. And the temperature of the exhaust gas at the outlet of the economizer drops below the acid dew point temperature, and low-temperature corrosion such as corrosion of the pipe inside the economizer occurs, resulting in a short life of the economizer.
【０００４】本発明はこのような従来の欠点を除去し、
ボイラ本体から排出される排ガス量が少ない時には給水
加熱量を少なくして、排ガスの温度が極端に下がらない
ようにして、エコノマイザが長期使用に耐えられるよう
にした多管式貫流ボイラを提供することを目的とするも
のである。The present invention eliminates such conventional disadvantages,
To provide a multi-tube once-through boiler in which the amount of heating water supplied is reduced when the amount of exhaust gas discharged from the boiler body is small, so that the temperature of the exhaust gas does not drop extremely and the economizer can withstand long-term use. It is intended for.
【０００５】[0005]
【課題を解決するための手段】本発明の多管式貫流ボイ
ラは、ボイラ本体からの排ガスで該ボイラ本体への給水
を加熱するエコノマイザと、前記ボイラ本体に夫々燃料
を供給する大容量燃料供給弁、中容量燃料供給弁、小容
量燃料供給弁と、給水ポンプの吐出側を通電閉電磁弁を
介して前記エコノマイザの水流入口に接続する給水元管
と、前記エコノマイザの水流出口を前記ボイラ本体の給
水口に接続するボイラ給水管と、通電開電磁弁を途中に
有し前記給水元管とボイラ給水管とを接続する給水バイ
パス管と、前記ボイラ本体で生成された蒸気の圧力が予
め定めた下限の圧力まで低下した時に高燃焼作動指令を
出力する第１の圧力スイッチと、前記ボイラ本体で生成
された蒸気の圧力が前記予め定めた下限の圧力と予め定
めた上限の圧力との間にある時に中燃焼作動指令を出力
する第２の圧力スイッチと、前記ボイラ本体で生成され
た蒸気の圧力が前記予め定めた上限の圧力に達した時に
低燃焼作動指令を出力する第３の圧力スイッチと、前記
高燃焼作動指令が出力された時前記大容量燃料供給弁へ
弁開指令を出力し前記中燃焼作動指令が出力された時前
記中容量燃料供給弁へ弁開指令を出力し前記低燃焼作動
指令が出力された時前記小容量燃料供給弁へ弁開指令を
出力する燃焼制御器と、前記中容量燃料供給弁へ弁開指
令が出力された時前記通電開電磁弁を通電し、前記小容
量燃料供給弁へ弁開指令が出力された時前記通電開電磁
弁と通電閉電磁弁とを通電するエコノマイザ給水制御器
と、を備えたことを特徴とするものである。SUMMARY OF THE INVENTION A multi-tube once-through boiler according to the present invention comprises an economizer for heating water supplied to the boiler main body with exhaust gas from the boiler main body, and a large-capacity fuel supply for supplying fuel to the boiler main body, respectively. A valve, a medium-capacity fuel supply valve, a small-capacity fuel supply valve, a water supply source pipe connecting a discharge side of a water supply pump to a water inflow port of the economizer through an energizing solenoid valve, and a water outflow port of the economizer to the boiler body. A boiler feed pipe connected to the water supply port of the water supply, a feed water bypass pipe having an energizing opening solenoid valve in the middle and connecting the water supply source pipe and the boiler feed pipe, and a pressure of steam generated in the boiler main body are predetermined. A first pressure switch that outputs a high combustion operation command when the pressure drops to the lower limit pressure, and the pressure of the steam generated by the boiler body is set to the predetermined lower limit pressure and the predetermined upper limit pressure. A second pressure switch for outputting a medium combustion operation command when it is in between, and a third pressure switch for outputting a low combustion operation command when the pressure of the steam generated by the boiler body reaches the predetermined upper limit pressure. A pressure switch, outputs a valve opening command to the large capacity fuel supply valve when the high combustion operation command is output, and outputs a valve opening command to the medium capacity fuel supply valve when the medium combustion operation command is output. A combustion controller that outputs a valve opening command to the small capacity fuel supply valve when the low combustion operation command is output, and energizes the energizing open solenoid valve when a valve opening command is output to the medium capacity fuel supply valve. And an economizer water supply controller for energizing the energized opening solenoid valve and the energized closing solenoid valve when a valve opening command is output to the small capacity fuel supply valve.
【０００６】[0006]
【作用】第１の圧力スイッチ、第２の圧力スイッチ、第
３の圧力スイッチが常時ボイラ本体で生成された蒸気の
圧力を検出し、ボイラ本体で生成された蒸気の圧力が予
め定めた下限の圧力と予め定めた上限の圧力との間の時
には、燃焼制御器、エコノマイザ給水制御器を介して通
電開電磁弁を通電し、給水の一部がエコノマイザに入ら
ずに給水バイパス管を通るようにし、ボイラ本体で生成
された蒸気の圧力が予め定めた下限の圧力まで低下した
時には、燃焼制御器、エコノマイザ給水制御器を介して
通電開電磁弁と通電閉電磁弁とを通電し、給水の全部が
エコノマイザに入らずに給水バイパス管を通るようにし
て、エコノマイザでの排ガス温度の急激な低下を防ぐよ
うになる。The first pressure switch, the second pressure switch, and the third pressure switch constantly detect the pressure of the steam generated in the boiler main body, and the pressure of the steam generated in the boiler main body falls below a predetermined lower limit. When the pressure is between the pressure and the predetermined upper limit pressure, the energization opening solenoid valve is energized through the combustion controller and the economizer water supply controller so that a part of the water supply passes through the water supply bypass pipe without entering the economizer. When the pressure of the steam generated by the boiler body drops to a predetermined lower limit pressure, the energizing open solenoid valve and the energizing closing solenoid valve are energized through the combustion controller and the economizer water supply controller, and the entire supply of water is performed. The gas flows through the water supply bypass pipe without entering the economizer, thereby preventing a rapid decrease in the exhaust gas temperature in the economizer.
【０００７】[0007]
【実施例】以下、本発明の実施例を図を参照して説明す
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.
【０００８】図１は本発明の一実施例のブロック図を示
しており、ボイラ本体１での燃焼に使用する燃料は、油
ポンプ２から大容量燃料供給弁３、中容量燃料供給弁
４、小容量燃料供給弁５を介してボイラ本体１に供給さ
れるようになっており、大容量燃料供給弁３、中容量燃
料供給弁４、小容量燃料供給弁５は、燃料制御器６から
の弁開指令により開くようになっている。FIG. 1 is a block diagram showing one embodiment of the present invention. Fuel used for combustion in a boiler body 1 is supplied from an oil pump 2 to a large-capacity fuel supply valve 3, a medium-capacity fuel supply valve 4, The fuel is supplied to the boiler body 1 through the small-capacity fuel supply valve 5. The large-capacity fuel supply valve 3, the medium-capacity fuel supply valve 4, and the small-capacity fuel supply valve 5 are supplied from the fuel controller 6. The valve is opened by a valve open command.
【０００９】７は給水ポンプであって、給水ポンプ７の
吐出側は、給水元管８、通電閉電磁弁９を介して、エコ
ノマイザ１０の水流入口１１に接続されている。上記の
通電閉電磁弁９は、通電されている時に閉じ、通電され
ていない時には開いている電磁弁である。エコノマイザ
１０の水流出口１２は、通常開かれている手動操作の開
閉弁１３、ボイラ給水管１４を介してボイラ本体１の給
水口１５に接続されている。Reference numeral 7 denotes a water supply pump. The discharge side of the water supply pump 7 is connected to a water inlet 11 of an economizer 10 via a water supply source pipe 8 and an energizing closing solenoid valve 9. The energizing closing solenoid valve 9 is a solenoid valve that closes when energized and opens when not energized. The water outlet 12 of the economizer 10 is connected to a water supply port 15 of the boiler main body 1 via a normally opened / closed valve 13 and a boiler water supply pipe 14 which are normally opened.
【００１０】上述した給水元管８とボイラ給水管１４と
は給水バイパス管１６により接続されていて、給水バイ
パス管１６の途中には通電開電磁弁１７が設けられてい
る。通電開電磁弁１７は、通電されている時に開き、通
電されていない時には閉じている電磁弁である。ボイラ
本体１には水位検出器１８が取り付けてあって、ボイラ
水制御器１９を介して給水ポンプ７の運転を制御するよ
うになっている。The above-mentioned water supply pipe 8 and the boiler water supply pipe 14 are connected by a water supply bypass pipe 16, and an energization opening solenoid valve 17 is provided in the water supply bypass pipe 16. The energization opening solenoid valve 17 is an electromagnetic valve that is opened when energized and closed when not energized. A water level detector 18 is attached to the boiler main body 1, and controls the operation of the water supply pump 7 via a boiler water controller 19.
【００１１】ボイラ本体１で生成された蒸気は、蒸気管
２０を通って気水分離器２１に導入され、気水分離器２
１で水分を除去されて消費側へ送給され、気水分離器２
１で分離された水は、降水管２２からボイラ本体１に戻
されるようになっている。The steam generated in the boiler main body 1 is introduced into a steam separator 21 through a steam pipe 20 and is separated from the steam separator 21.
The water is removed in 1 and sent to the consumer side, where the steam-water separator 2
The water separated in 1 is returned to the boiler main body 1 from the downcomer 22.
【００１２】ボイラ本体１で生成された蒸気が通る蒸気
管２０には、第１の圧力スイッチ２３、第２の圧力スイ
ッチ２４、第３の圧力スイッチ２５の３個の蒸気の圧力
を検出する圧力スイッチが接続されている。The steam pipe 20 through which the steam generated by the boiler body 1 passes has a first pressure switch 23, a second pressure switch 24, and a third pressure switch 25 for detecting the pressures of the three steams. Switch is connected.
【００１３】第１の圧力スイッチ２３は、蒸気管２０を
流れる蒸気の圧力ＰEが予め定めた下限の圧力ＰE1まで
低下した時に燃料制御器６へ高燃焼作動指令Ｖ1を出力
するようになっており、第２の圧力スイッチ２４は、蒸
気管２０を流れる蒸気の圧力ＰEが予め定めた下限の圧
力ＰE1と上限の圧力ＰE2との間にある時に燃料制御器６
へ中燃焼作動指令Ｖ2を出力するようになっており、第
３の圧力スイッチ２５は、蒸気管２０を流れる蒸気の圧
力ＰEが予め定めた上限の圧力ＰE2に達した時に燃料制
御器６へ低燃焼作動指令Ｖ3を出力するようになってい
る。A first pressure switch 23, to output a high combustion operation command V 1 to the fuel controller 6 when the pressure P E of the steam flowing through the steam pipe 20 is lowered to a pressure P E1 of the lower limit of the predetermined it is, the second pressure switch 24, a fuel controller 6 when it is between the lower limit pressure P E1 and the upper limit of the pressure P E2 of the pressure P E is predetermined for the steam flowing through the steam pipe 20
Is adapted to output a medium combustion operation command V 2 to the third pressure switch 25, a fuel controller when the pressure P E of the steam flowing through the steam pipe 20 reaches the pressure P E2 of predetermined upper limit A low combustion operation command V 3 is output to the control unit 6.
【００１４】燃料制御器６へ低燃焼作動指令Ｖ3が与え
られた場合には、燃料制御器６から小容量燃料供給弁５
へ弁開指令Ｖ6が出力され、燃料制御器６へ中燃焼作動
指令Ｖ2が与えられた場合には、燃料制御器６から中容
量燃料供給弁４へ弁開指令Ｖ5が出力され、低容量燃料
供給弁５と、中容量燃料供給弁４が開となる。さらに、
燃料制御器６へ高燃焼作動指令Ｖ1が与えられた場合に
は、燃料制御器６から大容量燃料供給弁３へ弁開指令Ｖ
4が出力され、低容量燃料供給弁５と中容量燃料供給弁
４と大容量燃料供給弁３が開となる。When the low combustion operation command V 3 is given to the fuel controller 6, the small-capacity fuel supply valve 5
To the output valve opening command V 6, when the middle combustion operation command V 2 to the fuel controller 6 is given, the fuel controller 6 to the medium-capacity fuel supply valve 4 valve opening command V 5 is output, The low-capacity fuel supply valve 5 and the medium-capacity fuel supply valve 4 are opened. further,
When the high combustion operation command V 1 is given to the fuel controller 6, the valve opening command V is sent from the fuel controller 6 to the large capacity fuel supply valve 3.
4 is output, and the low-capacity fuel supply valve 5, the medium-capacity fuel supply valve 4, and the large-capacity fuel supply valve 3 are opened.
【００１５】上述のように燃料制御器６から中容量燃料
供給弁４へ弁開指令Ｖ5が出力されている時には、弁開
指令Ｖ5はエコノマイザ給水制御器２６にも与えられ、
エコノマイザ給水制御器２６は通電開電磁弁１７を通電
するようになっている。また燃料制御器６から小容量燃
料供給弁５へ弁開指令Ｖ6が出力されている時には、弁
開指令Ｖ6はエコノマイザ給水制御器２６にも与えら
れ、エコノマイザ給水制御器２６は通電閉電磁弁９と通
電開電磁弁１７の夫々を通電するようになっている。[0015] When the valve opening command V 5 from the fuel controller 6 to the medium-capacity fuel supply valve 4 as described above is output, valve opening command V 5 is given to economizer feedwater controller 26,
The economizer water supply controller 26 energizes the energization opening solenoid valve 17. When the valve opening command V 6 is output from the fuel controller 6 to the small-capacity fuel supply valve 5, the valve opening command V 6 is also given to the economizer water supply controller 26, and the economizer water supply controller 26 turns on the power supply closed electromagnetic valve. Each of the valve 9 and the energizing solenoid valve 17 is energized.
【００１６】ボイラ本体１での燃料の燃焼により発生し
た排ガスは、排ガス通路２７を通ってエコノマイザ１０
内に導入され、水流入口１１から加熱管２８を経て水流
出口１２に流れる水を加熱した後、外部に排出されるよ
うになっている。Exhaust gas generated by the combustion of fuel in the boiler body 1 passes through an exhaust gas passage 27 and passes through the economizer 10.
After heating the water flowing into the water outlet 12 from the water inlet 11 through the heating pipe 28, the water is discharged to the outside.
【００１７】次に、上述した装置の作用を説明する。Next, the operation of the above-described device will be described.
【００１８】蒸気管２０を流れる蒸気の圧力ＰEが予め
定めた下限の圧力ＰE1まで低下する（ＰE≦ＰE1）と、
第１の圧力スイッチ２３から燃料制御器６へ高燃焼作動
指令Ｖ1が出力され、燃料制御器６から大容量燃料供給
弁３へ弁開指令Ｖ4が出力されてボイラ本体１への燃料
供給量が大容量になり、高燃焼の状態となってボイラ本
体１から排ガス通路２７を通ってエコノマイザ１０内に
導入される排ガスの量は多くなる。[0018] The pressure P E of the steam flowing through the steam pipe 20 is lowered to the pressure P E1 in the lower limit predetermined and (P E ≦ P E1),
A high combustion operation command V 1 is output from the first pressure switch 23 to the fuel controller 6, a valve opening command V 4 is output from the fuel controller 6 to the large capacity fuel supply valve 3, and fuel is supplied to the boiler body 1. The amount becomes large and the combustion state becomes high, and the amount of exhaust gas introduced into the economizer 10 from the boiler body 1 through the exhaust gas passage 27 increases.
【００１９】この状態の時には、燃料制御器６は通電閉
電磁弁９、通電開電磁弁１７のいずれも通電しないた
め、通電閉電磁弁９は開き、通電開電磁弁１７は閉じる
ことになる。従って給水ポンプ７から給水元管８に吐出
された水は全て水流入口１１から加熱管２８を経て水流
出口１２に流れ、全部の給水が加熱されてボイラ給水管
１４、給水口１５を通ってボイラ本体１に供給される。In this state, the fuel controller 6 does not energize either the energizing closing solenoid valve 9 or the energizing opening solenoid valve 17, so that the energizing closing solenoid valve 9 opens and the energizing opening solenoid valve 17 closes. Therefore, all the water discharged from the water supply pump 7 to the water supply source pipe 8 flows from the water inlet 11 to the water outlet 12 through the heating pipe 28, and all the water is heated, and the water is heated through the boiler water supply pipe 14 and the water supply port 15 to the boiler. It is supplied to the main body 1.
【００２０】このように全部の給水が排ガスにより加熱
される状態になっても、エコノマイザ１０内に導入され
る排ガスの量が多いため、排ガス温度の低下は少ない。As described above, even when all the feed water is heated by the exhaust gas, the amount of the exhaust gas introduced into the economizer 10 is large, so that the temperature of the exhaust gas does not decrease much.
【００２１】蒸気管２０を流れる蒸気の圧力ＰEが予め
定めた下限の圧力ＰE1と上限の圧力ＰE2との間にある時
（ＰE1＜ＰE＜ＰE2）には、第２の圧力スイッチ２４か
ら燃料制御器６へ中燃焼作動指令Ｖ2が出力され、燃料
制御器６から中容量燃料供給弁４へ弁開指令Ｖ5が出力
されてボイラ本体１への燃料供給量が中容量になり、中
燃焼の状態となってボイラ本体１から排ガス通路２７を
通ってエコノマイザ１０内に導入される排ガスの量は中
程度の量になる。[0021] When (P E1 <P E <P E2) lying between the lower limit pressure P E1 and the upper limit of the pressure P E2 of the pressure P E is predetermined for the steam flowing through the steam pipe 20, the second A medium combustion operation command V 2 is output from the pressure switch 24 to the fuel controller 6, a valve opening command V 5 is output from the fuel controller 6 to the medium capacity fuel supply valve 4, and the fuel supply amount to the boiler main body 1 is medium. The capacity of the boiler is changed to a medium combustion state, and the amount of exhaust gas introduced into the economizer 10 from the boiler main body 1 through the exhaust gas passage 27 becomes a medium amount.
【００２２】燃料制御器６から中容量燃料供給弁４へ弁
開指令Ｖ5が出力されている時には、弁開指令Ｖ5はエコ
ノマイザ給水制御器２６にも与えられ、エコノマイザ給
水制御器２６は通電開電磁弁１７を通電する。このため
通電開電磁弁１７は開き、給水ポンプ７から給水元管８
に吐出された水は共に開いている通電閉電磁弁９、通電
開電磁弁１７の両方を通ることになる。従って給水ポン
プ７から給水元管８に吐出された水は、加熱管２８を経
てボイラ給水管１４に流れるものと、加熱管２８を経由
せずに給水元管８から給水バイパス管１６を経て直接ボ
イラ給水管１４に流れるものとに分けられるようにな
る。[0022] When the fuel controller 6 to the medium-capacity fuel supply valve 4 valve opening command V 5 is output, valve opening command V 5 is given to economizer feedwater controller 26, economizer feedwater controller 26 energized The open solenoid valve 17 is energized. Therefore, the energization opening solenoid valve 17 is opened, and the water supply pump 7
Is passed through both the energizing closing solenoid valve 9 and the energizing opening solenoid valve 17 which are both open. Accordingly, the water discharged from the water supply pump 7 to the water supply pipe 8 flows through the heating pipe 28 to the boiler water supply pipe 14 and directly from the water supply pipe 8 to the water supply bypass pipe 16 without passing through the heating pipe 28. It can be divided into those flowing into the boiler feed pipe 14.
【００２３】このように排ガスにより加熱される給水が
少なくなるため、エコノマイザ１０内に導入される排ガ
スの量が中程度の量になっても、排ガス温度の低下は少
ない。As described above, since the amount of water supplied by the exhaust gas is reduced, even if the amount of the exhaust gas introduced into the economizer 10 becomes a medium amount, the temperature of the exhaust gas does not decrease much.
【００２４】蒸気管２０を流れる蒸気の圧力ＰEが予め
定めた上限の圧力ＰE2に達する（ＰE≧ＰE2）と、第３
の圧力スイッチ２５から燃料制御器６へ低燃焼作動指令
Ｖ3が出力され、燃料制御器６から小容量燃料供給弁５
へ弁開指令Ｖ6が出力されてボイラ本体１への燃料供給
量が小容量になり、低燃焼の状態となってボイラ本体１
から排ガス通路２７を通ってエコノマイザ１０内に導入
される排ガスの量は少なくなる。When the pressure P E of the steam flowing through the steam pipe 20 reaches a predetermined upper limit pressure P E2 (P E ≧ P E2 ), the third
A low combustion operation command V 3 is output from the pressure switch 25 to the fuel controller 6, and the small capacity fuel supply valve 5 is output from the fuel controller 6.
To valve opening command V 6 is output becomes the fuel supply amount is small capacity of the boiler body 1, a boiler main body 1 becomes low combustion state
The amount of exhaust gas introduced into the economizer 10 through the exhaust gas passage 27 is reduced.
【００２５】燃料制御器６から小容量燃料供給弁５へ弁
開指令Ｖ6が出力されている時には、弁開指令Ｖ6はエコ
ノマイザ給水制御器２６にも与えられ、エコノマイザ給
水制御器２６は通電閉電磁弁９と通電開電磁弁１７とを
通電する。このため通電閉電磁弁９は閉じて通電開電磁
弁１７は開いた状態になり、給水ポンプ７から給水元管
８に吐出された水はエコノマイザ１０内に入ることな
く、全部が給水バイパス管１６を経て直接ボイラ給水管
１４に流れることになる。When the valve opening command V 6 is output from the fuel controller 6 to the small capacity fuel supply valve 5, the valve opening command V 6 is also given to the economizer water supply controller 26, and the economizer water supply controller 26 is turned on. The closing solenoid valve 9 and the energizing opening solenoid valve 17 are energized. Accordingly, the energizing closing solenoid valve 9 is closed and the energizing opening solenoid valve 17 is in an open state, and the water discharged from the water supply pump 7 to the water supply source pipe 8 does not enter the economizer 10, but is entirely supplied to the water supply bypass pipe 16. And flows directly to the boiler feed pipe 14.
【００２６】このようにエコノマイザ１０内に導入され
る排ガスの量は少なくなるが、エコノマイザ１０内で給
水の加熱を行なわないため、排ガス温度の低下は少な
い。As described above, the amount of exhaust gas introduced into the economizer 10 is reduced, but the temperature of the exhaust gas is not significantly reduced because the supply water is not heated in the economizer 10.
【００２７】上述したように蒸気管２０を流れる蒸気の
圧力ＰEに応じて、エコノマイザ１０内で排ガスにより
加熱する給水の量を増減し、排ガス温度の低下を防ぐこ
とになる。[0027] Depending on the pressure P E of the steam flowing through the steam pipe 20 as described above, to increase or decrease the amount of water to be heated by the exhaust gas economizer 10, thereby to prevent a decrease in exhaust gas temperature.
【００２８】[0028]
【発明の効果】本発明は、ボイラ本体で生成された蒸気
の圧力を検出して燃料の量を増減し、高燃焼状態で排ガ
スの量が多い時にはエコノマイザで排ガスにより加熱さ
れる給水の量を多くし、中燃焼状態で排ガスの量が中程
度の時にはエコノマイザで排ガスにより加熱される給水
の量を少なくし、低燃焼状態で排ガスの量が少ない時に
は排ガスを給水加熱に利用しないため、エコノマイザで
排ガスの温度が極端に下がることがなく、エコノマイザ
内部の管の腐食等の低温腐食が起こらなくなって、エコ
ノマイザが長期使用に耐えるようになる効果がある。According to the present invention, the amount of fuel is increased or decreased by detecting the pressure of steam generated in the boiler body, and when the amount of exhaust gas is large in a high combustion state, the amount of water supplied by the exhaust gas to be heated by the economizer is reduced. When the amount of exhaust gas is medium in the middle combustion state, the amount of feedwater heated by the exhaust gas is reduced when the amount of exhaust gas is medium, and when the amount of exhaust gas is low in the low combustion state, the exhaust gas is not used for heating the feedwater. There is an effect that the temperature of the exhaust gas does not drop extremely and low-temperature corrosion such as corrosion of a pipe inside the economizer does not occur, and the economizer can withstand long-term use.
【図１】本発明の一実施例のブロック図である。FIG. 1 is a block diagram of one embodiment of the present invention.
１ ボイラ本体 ３ 大容量燃料供給弁 ４ 中容量燃料供給弁 ５ 小容量燃料供給弁 ６ 燃料制御器 ７ 給水ポンプ ８ 給水元管 ９ 通電閉電磁弁 １０ エコノマイザ １１ 水流入口 １２ 水流出口 １４ ボイラ給水管 １５ 給水口 １６ 給水バイパス管 １７ 通電開電磁弁 ２３ 第１の圧力スイッチ ２４ 第２の圧力スイッチ ２５ 第３の圧力スイッチ ２６ エコノマイザ給水制御器 ＰE 蒸気の圧力 ＰE1 下限の圧力 ＰE2 上限の圧力 Ｖ1 高燃焼作動指令 Ｖ2 中燃焼作動指令 Ｖ3 低燃焼作動指令 Ｖ4 弁開指令 Ｖ5 弁開指令 Ｖ6 弁開指令DESCRIPTION OF SYMBOLS 1 Boiler main body 3 Large-capacity fuel supply valve 4 Medium-capacity fuel supply valve 5 Small-capacity fuel supply valve 6 Fuel controller 7 Water supply pump 8 Water supply main pipe 9 Electric closing solenoid valve 10 Economizer 11 Water inlet 12 Water outlet 14 Boiler supply pipe 15 water inlet 16 water bypass pipe 17 energized open solenoid valve 23 first pressure switch 24 and the second pressure switch 25 a third pressure switch 26 economizer feedwater controller P E pressure P E1 lower limit of the pressure P E2 upper pressure limit V of the steam 1 High combustion operation command V 2 Medium combustion operation command V 3 Low combustion operation command V 4 Valve open command V 5 Valve open command V 6 Valve open command
フロントページの続き (56)参考文献 特開 昭60−69407（ＪＰ，Ａ) 実開 昭59−175805（ＪＰ，Ｕ) 実開 平３−46708（ＪＰ，Ｕ) 実開 平４−122906（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F22D 1/12 F22B 35/00 Continuation of the front page (56) References JP-A-60-69407 (JP, A) JP-A-59-175805 (JP, U) JP-A-3-46708 (JP, U) JP-A-4-122906 (JP) , U) (58) Field surveyed (Int. Cl. 7 , DB name) F22D 1/12 F22B 35/00
Claims (1)
への給水を加熱するエコノマイザと、前記ボイラ本体に
夫々燃料を供給する大容量燃料供給弁、中容量燃料供給
弁、小容量燃料供給弁と、給水ポンプの吐出側を通電閉
電磁弁を介して前記エコノマイザの水流入口に接続する
給水元管と、前記エコノマイザの水流出口を前記ボイラ
本体の給水口に接続するボイラ給水管と、通電開電磁弁
を途中に有し前記給水元管とボイラ給水管とを接続する
給水バイパス管と、前記ボイラ本体で生成された蒸気の
圧力が予め定めた下限の圧力まで低下した時に高燃焼作
動指令を出力する第１の圧力スイッチと、前記ボイラ本
体で生成された蒸気の圧力が前記予め定めた下限の圧力
と予め定めた上限の圧力との間にある時に中燃焼作動指
令を出力する第２の圧力スイッチと、前記ボイラ本体で
生成された蒸気の圧力が前記予め定めた上限の圧力に達
した時に低燃焼作動指令を出力する第３の圧力スイッチ
と、前記高燃焼作動指令が出力された時前記大容量燃料
供給弁へ弁開指令を出力し前記中燃焼作動指令が出力さ
れた時前記中容量燃料供給弁へ弁開指令を出力し前記低
燃焼作動指令が出力された時前記小容量燃料供給弁へ弁
開指令を出力する燃焼制御器と、前記中容量燃料供給弁
へ弁開指令が出力された時前記通電開電磁弁を通電し、
前記小容量燃料供給弁へ弁開指令が出力された時前記通
電開電磁弁と通電閉電磁弁とを通電するエコノマイザ給
水制御器と、を備えたことを特徴とする多管式貫流ボイ
ラ。1. An economizer for heating water supplied to a boiler body with exhaust gas from a boiler body, a large capacity fuel supply valve, a medium capacity fuel supply valve, and a small capacity fuel supply valve for supplying fuel to the boiler body, respectively. A water supply source pipe connecting the discharge side of the water supply pump to a water inlet of the economizer via an energized closing electromagnetic valve; a boiler water pipe connecting the water outlet of the economizer to a water inlet of the boiler body; A water supply bypass pipe having a valve in the middle and connecting the water supply pipe and the boiler water supply pipe; and outputting a high combustion operation command when the pressure of steam generated in the boiler main body drops to a predetermined lower limit pressure. And a second pressure switch for outputting a medium combustion operation command when the pressure of the steam generated in the boiler main body is between the predetermined lower limit pressure and the predetermined upper limit pressure. A pressure switch, a third pressure switch that outputs a low combustion operation command when the pressure of the steam generated by the boiler body reaches the predetermined upper limit pressure, and a third pressure switch that outputs the high combustion operation command. Outputting a valve opening command to the large capacity fuel supply valve and outputting the medium combustion operation command; outputting a valve opening command to the medium capacity fuel supply valve; outputting the low combustion operation command to the small capacity fuel. A combustion controller that outputs a valve opening command to a supply valve, and energizes the energizing opening solenoid valve when a valve opening command is output to the medium capacity fuel supply valve,
A multi-tube once-through boiler, comprising: an economizer water supply controller for energizing the energized opening solenoid valve and the energized closing solenoid valve when a valve opening command is output to the small capacity fuel supply valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05101308A JP3121172B2 (en) | 1993-04-27 | 1993-04-27 | Multi-tube once-through boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05101308A JP3121172B2 (en) | 1993-04-27 | 1993-04-27 | Multi-tube once-through boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06313502A JPH06313502A (en) | 1994-11-08 |
| JP3121172B2 true JP3121172B2 (en) | 2000-12-25 |
Family
ID=14297186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05101308A Expired - Lifetime JP3121172B2 (en) | 1993-04-27 | 1993-04-27 | Multi-tube once-through boiler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3121172B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101124641B (en) * | 2005-02-21 | 2011-04-13 | 核材料总公司 | Use of composition comprising chlorinated polyester resin in filling cracks on metal devices designed to contain acid and radioactive materials |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002295804A (en) * | 2001-03-29 | 2002-10-09 | Kawasaki Thermal Engineering Co Ltd | Method and device for controlling feed water of boiler |
| KR101032053B1 (en) * | 2009-04-29 | 2011-05-02 | 서일 | water-supply control device responding to the thermal fluctuation |
| JP2014228222A (en) * | 2013-05-24 | 2014-12-08 | 株式会社サムソン | Boiler with water supply preheater |
| CN106090871B (en) * | 2016-06-26 | 2018-04-24 | 潘炳松 | Ship boiler control circuit |
| CN106122923B (en) * | 2016-06-26 | 2018-04-24 | 潘炳松 | Ship boiler control device |
-
1993
- 1993-04-27 JP JP05101308A patent/JP3121172B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101124641B (en) * | 2005-02-21 | 2011-04-13 | 核材料总公司 | Use of composition comprising chlorinated polyester resin in filling cracks on metal devices designed to contain acid and radioactive materials |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06313502A (en) | 1994-11-08 |
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