JP4502150B1 - boiler - Google Patents

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JP4502150B1
JP4502150B1 JP2009143189A JP2009143189A JP4502150B1 JP 4502150 B1 JP4502150 B1 JP 4502150B1 JP 2009143189 A JP2009143189 A JP 2009143189A JP 2009143189 A JP2009143189 A JP 2009143189A JP 4502150 B1 JP4502150 B1 JP 4502150B1
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boiler
pressure
booster pump
water supply
pump
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JP2011002116A (en
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務 佐々木
繁昌 松木
記章 長井
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Miura Co Ltd
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Miura Co Ltd
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Priority to PCT/JP2009/003506 priority patent/WO2010146632A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
    • F22B1/1869—Hot gas water tube boilers not provided for in F22B1/1807 - F22B1/1861
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D11/00—Feed-water supply not provided for in other main groups
    • F22D11/02—Arrangements of feed-water pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
    • F22D5/26—Automatic feed-control systems
    • F22D5/32—Automatic feed-control systems influencing the speed or delivery pressure of the feed pumps

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)

Abstract

【課題】給水ラインにブースターポンプを備えたボイラにおいて、ブースターポンプの耐用期間を延ばすことを目的とする。
【解決手段】本実施形態に係るボイラ１は、缶体２、送風機３、ダクト４、排気筒５、セパレータ６、給水ライン１０、制御器３０を備えている。給水ライン１０には、給水ポンプ１３、ブースターポンプ２０が設置され、セパレータ６には、ボイラ内圧力を検出するための圧力スイッチ２５が設置されている。制御器３０は、圧力スイッチ２５の出力に基づいて、ボイラ内圧力が所定値以上の場合にはブースターポンプ２０を作動し続けるように制御する。
【選択図】図２An object of the present invention is to extend the service life of a booster pump in a boiler provided with a booster pump in a water supply line.
A boiler according to this embodiment includes a can body 2, a blower 3, a duct 4, an exhaust pipe 5, a separator 6, a water supply line 10, and a controller 30. The water supply line 10 is provided with a water supply pump 13 and a booster pump 20, and the separator 6 is provided with a pressure switch 25 for detecting the pressure in the boiler. Based on the output of the pressure switch 25, the controller 30 controls the booster pump 20 to continue operating when the pressure in the boiler is equal to or higher than a predetermined value.
[Selection] Figure 2

Description

本発明は、燃料を燃焼させて得た熱を水に伝え、水蒸気や温水に換える熱源機器であるボイラに関し、特に、ボイラの給水制御に関する。   The present invention relates to a boiler that is a heat source device that transfers heat obtained by burning fuel to water and converts it to water vapor or hot water, and particularly relates to boiler water supply control.

ボイラでは、缶体内の水位を適切に保持するために、水位検出器により検出した缶体内の水位に基づいて、給水ポンプを有する給水ラインから缶体内へと給水が行われており、例えば、下記特許文献１及び２に示すような構成のボイラが提供されている。   In the boiler, in order to appropriately maintain the water level in the can, water is supplied from the water supply line having the water supply pump to the can based on the water level detected by the water level detector. A boiler configured as shown in Patent Documents 1 and 2 is provided.

ところで、給水温度が高くなると、給水ポンプによる急激な昇圧によってキャビテーションが発生してしまう場合がある。キャビテーションが発生すると、給水ラインの配管の損傷、給水能力の低下等の問題が発生するので、キャビテーションの発生を抑制するために、給水ポンプの給水圧を補助的に増圧するためのブースターポンプを給水ラインに設置し、二段階で昇圧することが行われている。下記特許文献３には、給水ラインにブースターポンプを設置した構成が開示されている。   By the way, when the feed water temperature becomes high, cavitation may occur due to rapid pressure increase by the feed water pump. If cavitation occurs, problems such as damage to the piping of the water supply line and a decrease in water supply capacity will occur, so in order to suppress the occurrence of cavitation, a booster pump for supplementarily increasing the water supply pressure of the water supply pump is supplied. It is installed in the line and boosted in two stages. Patent Document 3 below discloses a configuration in which a booster pump is installed in a water supply line.

特開２００３−３２２３０４号公報JP 2003-322304 A 特開２００５−２３３５１０号公報JP 2005-233510 A 特開２００４−７７０５０号公報Japanese Patent Laid-Open No. 2004-77050

ところで、ブースターポンプに使用されているリレーや開閉器の接点等には耐用回数があり、これを超えてしまうと、ブースターポンプが作動しなくなってしまう。したがって、ブースターポンプを頻繁に発停させると耐用期間が短くなってしまう。   By the way, the relays used in the booster pump, the contacts of the switch, etc. have a service life, and if this is exceeded, the booster pump will not operate. Therefore, if the booster pump is frequently started and stopped, the service life is shortened.

本発明は、このような課題に鑑みてなされたものであり、給水ラインにブースターポンプを備えたボイラにおいて、ブースターポンプの耐用期間を延ばすことを目的とする。   This invention is made | formed in view of such a subject, and it aims at extending the lifetime of a booster pump in the boiler provided with the booster pump in the water supply line.

上記課題を解決するために、本発明に係るボイラは、缶体と、ボイラ内圧力を検出するボイラ内圧力検出器と、前記缶体に給水するための給水ポンプと、前記給水ポンプによる給水圧を補助的に増圧するためのブースターポンプと、前記ボイラ内圧力検出器の出力に基づいて、前記ボイラ内圧力が、前記ブースターポンプの揚程に相当する圧力よりも大きく、前記ボイラの使用圧力の下限値以下の所定値以上の場合には前記ブースターポンプを作動し続けるよう制御する制御器と、を備えることを特徴とする。 In order to solve the above-mentioned problems, a boiler according to the present invention includes a can body, a boiler pressure detector for detecting the pressure in the boiler, a feed water pump for supplying water to the can body, and a feed water pressure by the feed water pump. A booster pump for boosting the pressure of the boiler, and based on the output of the boiler pressure detector, the boiler pressure is larger than the pressure corresponding to the head of the booster pump, and the lower limit of the working pressure of the boiler And a controller for controlling the booster pump to continue to operate when the value is equal to or greater than a predetermined value.

本発明によれば、ブースターポンプの発停回数を減らして、ブースターポンプの耐用期間を大きく延ばすことができる。   According to the present invention, the service life of the booster pump can be greatly extended by reducing the number of times the booster pump starts and stops.

図１は、本発明の実施形態に係るボイラの構成を概略的に示す模式図である。FIG. 1 is a schematic diagram schematically showing the configuration of a boiler according to an embodiment of the present invention. 図２は、本実施形態に係る給水時の給水ポンプ及びブースターポンプの作動制御態様を示す図である。FIG. 2 is a diagram illustrating an operation control mode of the water supply pump and the booster pump during water supply according to the present embodiment. 図３は、本実施形態に係る圧力スイッチの圧力設定値P0を説明するための図である。FIG. 3 is a view for explaining the pressure set value P0 of the pressure switch according to the present embodiment.

以下、図面を参照しながら、本発明の実施形態に係るボイラについて説明する。図１は、本実施形態に係るボイラの構成を概略的に示す模式図である。同図に示すように、ボイラ１は、缶体２、送風機３、ダクト４、排気筒５、セパレータ６、給水ライン１０、制御器３０を備えている。   Hereinafter, a boiler according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram schematically showing the configuration of the boiler according to the present embodiment. As shown in the figure, the boiler 1 includes a can body 2, a blower 3, a duct 4, an exhaust pipe 5, a separator 6, a water supply line 10, and a controller 30.

ボイラ１では、送風機３から燃焼用空気が供給され、ダクト４において混合された燃料ガスと燃焼用空気が缶体２内で燃焼して缶体２内の上部ヘッダーと下部ヘッダーとを連結する多数の水管を加熱する。燃焼後の排気ガスは、排気筒５から外部へ排出される。セパレータ６は、蒸気取出ライン７によって上部ヘッダーと接続され、降水管８によって下部ヘッダーと接続されており、主蒸気弁９を開くことでセパレータ６から蒸気が取り出される。   In the boiler 1, combustion air is supplied from the blower 3, and the fuel gas mixed in the duct 4 and the combustion air are burned in the can body 2 to connect the upper header and the lower header in the can body 2. Heat the water tube. The exhaust gas after combustion is discharged from the exhaust cylinder 5 to the outside. The separator 6 is connected to the upper header by the steam extraction line 7 and is connected to the lower header by the downcomer 8, and the steam is taken out from the separator 6 by opening the main steam valve 9.

缶体２に給水するための給水ライン１０は、缶体２の下部ヘッダーに接続されており、給水ライン１０には、缶体側から逆止弁１２、給水ポンプ１３、モーターバルブ１４、流量計１６、ストレーナ１７、ブースターポンプ２０が設置されている。セパレータ６には、ボイラ内圧を検出するボイラ内圧力検出器としての圧力スイッチ２５が設置されており、ボイラ内圧力が所定値以上となると、圧力スイッチ２５はＯＮ信号を出力する。   A water supply line 10 for supplying water to the can body 2 is connected to a lower header of the can body 2. The water supply line 10 includes a check valve 12, a water supply pump 13, a motor valve 14, and a flow meter 16 from the can body side. A strainer 17 and a booster pump 20 are installed. The separator 6 is provided with a pressure switch 25 serving as a boiler pressure detector for detecting the boiler internal pressure. When the boiler pressure exceeds a predetermined value, the pressure switch 25 outputs an ON signal.

制御器３０は、主蒸気弁９、給水ポンプ１３、モーターバルブ１４、ブースターポンプ２０と接続されており、これらの作動を制御する。また、制御器３０は、流量計１６、圧力スイッチ２５と接続されており、これらの出力信号を受信する。なお、本実施形態に係るボイラ１は、燃焼量を、高燃焼、低燃焼、停止の三位置で制御するものであり、ターンダウン比は、１：５である。   The controller 30 is connected to the main steam valve 9, the feed water pump 13, the motor valve 14, and the booster pump 20, and controls these operations. The controller 30 is connected to the flow meter 16 and the pressure switch 25 and receives these output signals. The boiler 1 according to the present embodiment controls the combustion amount at three positions of high combustion, low combustion, and stop, and the turndown ratio is 1: 5.

以上、ボイラ１の構成について説明したが、続いて、ボイラ１における給水の制御態様について、図２を参照しながら説明する。図２は、本実施形態に係る給水時の給水ポンプ及びブースターポンプの作動制御態様を示す図である。通常、ブースターポンプ２０は、給水ポンプ１３の作動（ＯＮ）に連動して作動し、給水ポンプ１３の停止（ＯＦＦ）から所定時間遅れて停止するように制御されるが、本実施形態では、圧力スイッチ２５がＯＮの場合には、給水ポンプ１３の停止に関わらずブースターポンプを作動させるように制御することを特徴としている。   As mentioned above, although the structure of the boiler 1 was demonstrated, the control aspect of the water supply in the boiler 1 is demonstrated referring FIG. FIG. 2 is a diagram illustrating an operation control mode of the water supply pump and the booster pump during water supply according to the present embodiment. Normally, the booster pump 20 operates in conjunction with the operation (ON) of the water supply pump 13 and is controlled to stop after a predetermined time from the stop (OFF) of the water supply pump 13. When the switch 25 is ON, the booster pump is controlled to operate regardless of the stoppage of the feed water pump 13.

図２に示すように、まず、制御器３０からの給水指令によりt1で給水ポンプ１３がＯＮになると、これに連動して同時にブースターポンプ２０もＯＮ制御される。このように、給水ポンプ１３とブースターポンプ２０によって給水ラインの給水圧を二段階で昇圧するようにすれば、急激な昇圧を抑えて、キャビテーションの発生を防止することができる。   As shown in FIG. 2, first, when the water supply pump 13 is turned on at t <b> 1 by a water supply command from the controller 30, the booster pump 20 is also ON-controlled simultaneously with this. Thus, if the water supply pressure of the water supply line is increased in two stages by the water supply pump 13 and the booster pump 20, rapid pressure increase can be suppressed and the occurrence of cavitation can be prevented.

続いて、t2で制御器３０からの停止指令により給水ポンプ１３がＯＦＦになると、所定時間遅れてブースターポンプ２０もt3でＯＦＦ制御される。そして、t4でボイラ内圧が所定値以上になり圧力スイッチ２５がＯＮになると、圧力スイッチ２５のＯＮ出力を受けた制御器３０は、同時にブースターポンプ２０を作動（ＯＮ）させる。   Subsequently, when the feed water pump 13 is turned off by a stop command from the controller 30 at t2, the booster pump 20 is also turned off at t3 after a predetermined time delay. When the boiler internal pressure becomes equal to or higher than the predetermined value at t4 and the pressure switch 25 is turned on, the controller 30 that receives the ON output of the pressure switch 25 simultaneously activates (ON) the booster pump 20.

次に、制御器３０からの作動指令で、t5で給水ポンプ１３がＯＮになると、既にＯＮになっているブースターポンプ２０も引き続きＯＮ制御される。そして、停止指令によりt6で給水ポンプ１３がＯＦＦになっても、圧力スイッチ２５がＯＮのままであるため、ブースターポンプ２０もＯＮのままに制御される。すなわち、従来であれば、t6で給水ポンプ１３がＯＦＦになると、所定時間遅れてt7でブースターポンプ２０がＯＦＦ制御されるが、本実施形態では、圧力スイッチ２５がＯＮである限り、ブースターポンプ２０もＯＮ制御される。   Next, when the feed water pump 13 is turned on at t5 by an operation command from the controller 30, the booster pump 20 that is already turned on is also continuously turned on. And even if the feed water pump 13 is turned off at t6 by the stop command, the pressure switch 25 is kept on, so that the booster pump 20 is also kept on. That is, conventionally, when the water supply pump 13 is turned off at t6, the booster pump 20 is controlled to be turned off at t7 after a predetermined time delay. In this embodiment, as long as the pressure switch 25 is turned on, the booster pump 20 is controlled. Is also ON-controlled.

このように、本実施形態では、圧力スイッチ２５の出力に基づいて、ボイラ内圧が所定値以上あれば、ブースターポンプ２０を作動するように制御しているため、ブースターポンプ２０の発停回数を減らして、従来と比べて格段にブースターポンプ２０の耐用期間を伸ばすことができる。   Thus, in this embodiment, since the booster pump 20 is controlled to operate if the boiler internal pressure is equal to or higher than a predetermined value based on the output of the pressure switch 25, the number of times the booster pump 20 is started and stopped is reduced. Thus, the service life of the booster pump 20 can be extended significantly compared to the conventional case.

ここで、ブースターポンプ２０を作動し続けるための条件を、ボイラ内圧が所定値以上であることとしたのは、ボイラ内圧力がブースターポンプ２０の揚程に相当する圧力以上であれば、ブースターポンプ２０の作動だけでは缶体２内への給水が行われないため、ブースターポンプ２０が作動し続けてもボイラ１の給水制御に支障がないからである。   Here, the condition for continuously operating the booster pump 20 is that the boiler internal pressure is equal to or higher than a predetermined value if the boiler internal pressure is equal to or higher than the pressure corresponding to the head of the booster pump 20. This is because the water supply into the can body 2 is not performed only by the operation of, so that there is no problem in the water supply control of the boiler 1 even if the booster pump 20 continues to operate.

次に、図３を参照しながら、本実施形態に係るブースターポンプ２０を作動し続けるための所定値（閾値）である、圧力スイッチ２５の圧力設定値について説明する。図３は、本実施形態に係る圧力スイッチの圧力設定値P0を説明するための図である。図３においては、縦軸が圧力Ｐ、横軸が流量Ｑを示している。P1から始まる実線がブースターポンプ２０の性能曲線であり、このP1がブースターポンプ２０の揚程に相当する揚程相当圧力である。   Next, the pressure set value of the pressure switch 25, which is a predetermined value (threshold value) for continuing to operate the booster pump 20 according to the present embodiment, will be described with reference to FIG. FIG. 3 is a view for explaining the pressure set value P0 of the pressure switch according to the present embodiment. In FIG. 3, the vertical axis indicates the pressure P, and the horizontal axis indicates the flow rate Q. The solid line starting from P1 is the performance curve of the booster pump 20, and this P1 is the head equivalent pressure corresponding to the head of the booster pump 20.

また、図３においては、本実施形態に係るボイラ１の使用圧力の下限値をP2、上限値をP3で示しており、P2及びP3で挟まれた範囲内のボイラ圧でボイラ１が運用される。ここで、圧力設定値P0が、揚程相当圧力P1以下であると、ボイラ内圧力が揚程相当圧力P1以下であってもブースターポンプ２０が作動してしまうことになってしまう。この場合、ブースターポンプ２０のみの作動で給水されてしまい、給水ポンプ１３による給水制御に支障をきたしてしまう。よって、圧力設定値P0は、揚程相当圧力P1よりも大きい値に設定する必要がある。   Moreover, in FIG. 3, the lower limit value of the working pressure of the boiler 1 according to the present embodiment is indicated by P2, and the upper limit value is indicated by P3, and the boiler 1 is operated at the boiler pressure within the range sandwiched between P2 and P3. The Here, if the pressure set value P0 is equal to or lower than the head equivalent pressure P1, the booster pump 20 will operate even if the boiler pressure is equal to or lower than the head equivalent pressure P1. In this case, water is supplied only by the operation of the booster pump 20, which hinders water supply control by the water supply pump 13. Therefore, the pressure set value P0 needs to be set to a value larger than the head equivalent pressure P1.

また、圧力設定値P0が、ボイラ１の使用圧力の下限値P2よりも大きいと、ボイラ１の使用圧力の範囲内で圧力スイッチ２５が頻繁にＯＦＦとなってしまい、ブースターポンプ２０を作動し続けることができなくなり、発停回数が増えてしまう。よって、圧力設定値P0は、ボイラ１の使用圧力の下限値P2以下に設定する必要がある。   Further, if the pressure set value P0 is larger than the lower limit value P2 of the working pressure of the boiler 1, the pressure switch 25 is frequently turned off within the working pressure range of the boiler 1, and the booster pump 20 is continuously operated. Will not be possible, and the number of starts and stops will increase. Therefore, it is necessary to set the pressure set value P0 to be equal to or lower than the lower limit value P2 of the working pressure of the boiler 1.

このように、ブースターポンプ２０を作動し続けるための条件となるボイラ内圧力の所定値を、揚程相当圧力P1よりも大きく、ボイラ１の使用圧力の下限値P2以下に設定すれば、給水ポンプ１３が作動していないときに缶体２に給水することなく、且つ、ボイラ１の正常な作動中はブースターポンプ２０を作動し続けて発停回数を抑えることが可能となる。   Thus, if the predetermined value of the boiler internal pressure, which is a condition for continuing to operate the booster pump 20, is set to be larger than the lift equivalent pressure P1 and lower than the lower limit value P2 of the working pressure of the boiler 1, the feed water pump 13 When the boiler is not in operation, the booster pump 20 can be continuously operated without supplying water to the can body 2 and during normal operation of the boiler 1 so that the number of starts and stops can be reduced.

なお、本実施形態では、揚程相当圧力P1が0.49MPa、ボイラ使用圧力の下限値P2が1MPa、上限値P3が2MPaである。よって、圧力スイッチ２５の圧力設定値P0は、0.49MPaよりも大きく、1MPaよりも小さい値に設定する必要があり、例えば、0.7MPaに設定することができる。   In this embodiment, the lift equivalent pressure P1 is 0.49 MPa, the lower limit value P2 of the boiler operating pressure is 1 MPa, and the upper limit value P3 is 2 MPa. Therefore, the pressure set value P0 of the pressure switch 25 needs to be set to a value larger than 0.49 MPa and smaller than 1 MPa, and can be set to 0.7 MPa, for example.

以上、本実施形態について詳細に説明したが、本実施形態によれば、ボイラ内圧力が所定値以上の場合にブースターポンプを作動し続けるように制御するので、ブースターポンプの発停回数を大幅に削減して、耐用期間を延ばすことができる。   As described above, the present embodiment has been described in detail. According to the present embodiment, since the booster pump is controlled to continue to operate when the pressure in the boiler is equal to or higher than a predetermined value, the number of times the booster pump starts and stops is greatly increased. It can be reduced and the service life can be extended.

なお、本発明の実施形態は上述した形態に限定されるものではなく、本発明の主旨を逸脱しない範囲内で種々の変形が可能である。例えば、上記実施形態では、ボイラ内圧力を検出するための圧力検出器として圧力スイッチを採用したが、圧力値を計測する圧力センサーを用いても良い。   The embodiment of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention. For example, in the above embodiment, the pressure switch is employed as a pressure detector for detecting the pressure in the boiler, but a pressure sensor that measures a pressure value may be used.

また、上記実施形態では、圧力検出器（圧力スイッチ）をセパレータに設置したが、圧力検出器の設置場所はボイラ内圧力を検出できる場所であれば、適宜他の場所に設置して良く、例えば、水位検出器、缶体の上部ヘッダー、給水ポンプの二次側に設置することができる。   Moreover, in the said embodiment, although the pressure detector (pressure switch) was installed in the separator, if the installation place of a pressure detector is a place which can detect the pressure in a boiler, you may install in another place suitably, for example, It can be installed on the secondary side of the water level detector, the upper header of the can body, and the water supply pump.

もちろん、ボイラのターンダウン比も適宜変更可能であるが、ターンダウン比が大きい場合に、給水ポンプ単独の場合の昇圧が急激となり、ブースターポンプの必要性が出てくるため、本発明はターンダウン比が１：４以上のボイラに対して特に有効でなる。   Of course, the turndown ratio of the boiler can be changed as appropriate. However, when the turndown ratio is large, the boost in the case of the feedwater pump alone becomes abrupt and the need for a booster pump comes out. This is particularly effective for a boiler having a ratio of 1: 4 or more.

１ ボイラ
２ 缶体
６ セパレータ
１０ 給水ライン
１３ 給水ポンプ
２０ ブースターポンプ
２５ 圧力スイッチ
３０ 制御器 DESCRIPTION OF SYMBOLS 1 Boiler 2 Can body 6 Separator 10 Water supply line 13 Water supply pump 20 Booster pump 25 Pressure switch 30 Controller

Claims (2)

缶体と、
ボイラ内圧力を検出するボイラ内圧力検出器と、
前記缶体に給水するための給水ポンプと、
前記給水ポンプによる給水圧を補助的に増圧するためのブースターポンプと、
前記ボイラ内圧力検出器の出力に基づいて、前記ボイラ内圧力が、前記ブースターポンプの揚程に相当する圧力よりも大きく、前記ボイラの使用圧力の下限値以下の所定値以上の場合には前記ブースターポンプを作動し続けるよう制御する制御器と、
を備えることを特徴とするボイラ。 Can body,
A boiler pressure detector for detecting the pressure in the boiler;
A water supply pump for supplying water to the can body;
A booster pump for supplementarily increasing the feed water pressure by the feed pump;
Based on the output of the boiler internal pressure detector, if the internal pressure of the boiler is greater than the pressure corresponding to the head of the booster pump and is not less than a predetermined value not more than the lower limit value of the working pressure of the boiler, the booster A controller that controls the pump to continue to operate;
A boiler characterized by comprising. 前記ボイラのターンダウン比が１：４以上であることを特徴とする請求項１記載のボイラ。 The boiler according to claim 1, wherein a turndown ratio of the boiler is 1: 4 or more.
JP2009143189A 2009-06-16 2009-06-16 boiler Active JP4502150B1 (en)

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CN103175190A (en) * 2013-03-29 2013-06-26 任振宇 Water supply system
CN112483425A (en) * 2020-12-11 2021-03-12 中国电力工程顾问集团西北电力设计院有限公司 Constant-speed water supply pump pressure regulating device and operation method

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JP5987576B2 (en) * 2012-09-13 2016-09-07 三浦工業株式会社 Boiler system

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JP2004077050A (en) * 2002-08-20 2004-03-11 Okada Reinetsu Kiko Kk Steam boiler system

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JPS61180813A (en) * 1985-02-01 1986-08-13 富士電機株式会社 Driving device for condensate booster pump
JPH11287404A (en) * 1998-03-31 1999-10-19 Miura Co Ltd Control method for feed water of boiler
JP2003130305A (en) * 2001-10-18 2003-05-08 Miura Co Ltd Method of feedwater control for steam boiler
JP2004077050A (en) * 2002-08-20 2004-03-11 Okada Reinetsu Kiko Kk Steam boiler system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103175190A (en) * 2013-03-29 2013-06-26 任振宇 Water supply system
CN112483425A (en) * 2020-12-11 2021-03-12 中国电力工程顾问集团西北电力设计院有限公司 Constant-speed water supply pump pressure regulating device and operation method

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