JPH0989209A - Steam temperature controller for boiler - Google Patents
Steam temperature controller for boilerInfo
- Publication number
- JPH0989209A JPH0989209A JP24778695A JP24778695A JPH0989209A JP H0989209 A JPH0989209 A JP H0989209A JP 24778695 A JP24778695 A JP 24778695A JP 24778695 A JP24778695 A JP 24778695A JP H0989209 A JPH0989209 A JP H0989209A
- Authority
- JP
- Japan
- Prior art keywords
- water injection
- control valve
- boiler
- valve
- water
- 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.)
- Granted
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 153
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 45
- 239000007921 spray Substances 0.000 claims abstract description 29
- 230000001105 regulatory effect Effects 0.000 claims abstract description 12
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 5
- 238000001704 evaporation Methods 0.000 claims abstract description 3
- 230000001276 controlling effect Effects 0.000 claims abstract 3
- 238000002347 injection Methods 0.000 claims description 102
- 239000007924 injection Substances 0.000 claims description 102
- 238000010438 heat treatment Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Landscapes
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ボイラの蒸気温度
制御装置に係り、特に過熱低減器を有するボイラの蒸気
温度制御装置であって高範囲の負荷変化時にも過熱低減
器に損傷を与えることの少ないボイラの蒸気温度制御装
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 steam temperature controller for a boiler, and more particularly to a steam temperature controller for a boiler having an overheat reducer, which damages the overheat reducer even when the load changes in a high range. The present invention relates to a steam temperature control device for a boiler that has a small amount of heat.
【０００２】[0002]
【従来の技術】過熱低減器を有する従来のボイラ出口蒸
気温度制御の系統を図５に示す。ボイラの系統は脱気器
からの給水を給水ポンプ１、高圧給水加熱器２、節炭器
３、ドラム４、１次過熱器５、２次過熱器６を経てター
ビンに所定温度の過熱蒸気を送るように構成されてい
る。１次過熱器５、２次過熱器６間に設置した過熱低減
器１０により蒸気温度を調整するスプレ系統は、ボイラ
給水ポンプ１出口から取出したスプレライン７に注水流
量調節弁９を設け、この弁９の開閉により過熱低減器１
０へのスプレ量を調節して過熱器出口蒸気温度を制御し
ていた。また、図５に示すドラムボイラの過熱低減器１
０に対する注水流量および注水流量調節弁９の開度は、
図４に示すように低負荷時と高負荷時で小さく、５０％
負荷付近で最大値を示している。2. Description of the Related Art A conventional boiler outlet steam temperature control system having an overheat reducer is shown in FIG. The boiler system feeds the feed water from the deaerator to the turbine through the feed water pump 1, the high pressure feed water heater 2, the economizer 3, the drum 4, the primary superheater 5 and the secondary superheater 6 It is configured to send. The spray system for adjusting the steam temperature by the superheat reducer 10 installed between the primary superheater 5 and the secondary superheater 6 is provided with a water injection flow rate control valve 9 in the spray line 7 taken out from the boiler feed water pump 1 outlet. Overheat reducer 1 by opening and closing valve 9
The amount of spray to 0 was adjusted to control the superheater outlet steam temperature. Further, the overheat reducer 1 for the drum boiler shown in FIG.
The water injection flow rate for 0 and the opening degree of the water injection flow rate control valve 9 are
As shown in Fig. 4, small at low load and high load, 50%
The maximum value is shown near the load.
【０００３】従来の過熱低減器注水制御系統図は図３に
示すように、蒸気温度検出器１７の検出値が信号設定器
１９の設定温度以上に上昇すると注水流量調節弁９が開
動作し、蒸気温度が規定値よりも低下すると注水流量調
節弁は全閉動作する。高範囲負荷変化において低負荷運
転時および高負荷運転時は、注水流量調節弁９はＯＮ−
ＯＦＦを繰返し過熱低減器１０に熱衝撃を与えることと
なり、過熱低減器１０の損傷が懸念された。したがっ
て、高範囲負荷変化に対して、過熱低減器を損傷するこ
となく安全に温度調整できる蒸気温度制御方式が求めら
れていた。As shown in FIG. 3, the conventional superheat reducer water injection control system diagram shows that when the detected value of the steam temperature detector 17 rises above the set temperature of the signal setter 19, the water injection flow rate control valve 9 opens. When the steam temperature falls below the specified value, the water injection flow control valve will fully close. During low load operation and high load operation in the high range load change, the water injection flow control valve 9 is ON-.
Repeated OFF causes thermal shock to the overheat reducer 10, and there is a concern that the overheat reducer 10 may be damaged. Therefore, there has been a demand for a steam temperature control system capable of safely adjusting the temperature without damaging the overheat reducer against a high range load change.
【０００４】[0004]
【発明が解決しようとする課題】すなわち上記従来技術
は過熱低減器の損傷についての配慮がされておらず、高
範囲な負荷変化が制約されるとともに、蒸気温度の調整
が難しいという問題があった。本発明の目的は、高範囲
負荷変化に対して注水流量調節弁のＯＮ−ＯＦＦ回数を
低減し（従来に較べて約１／１０）、過熱低減器を損傷
することなく安全に蒸気温度の調整を図ることができる
ボイラの蒸気温度制御装置を提供することにある。That is, the above-mentioned prior art does not consider damage to the overheat reducer, has a problem that the load change in a wide range is restricted and the steam temperature is difficult to adjust. . The object of the present invention is to reduce the number of times the water injection flow rate control valve is turned on and off in response to a high range load change (about 1/10 of the conventional value), and to safely adjust the steam temperature without damaging the superheat reducer. Another object of the present invention is to provide a steam temperature control device for a boiler that can achieve the above.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
本願で特許請求される発明は以下のとおりである。 （１）ボイラへ給水を供給する給水ポンプと、供給され
た給水を加熱して蒸気として過熱器部へ供給するボイラ
蒸発部と、ボイラの過熱器部から外部へ送給されるボイ
ラ出口過熱蒸気温度を調節するための過熱低減器と、前
記過熱低減器への注水を供給するスプレラインと、スプ
レラインに設けられた前記過熱低減器への注水量を調節
してボイラ出口過熱蒸気温度を制御する注水流量調節弁
とを備えたボイラの蒸気温度制御装置において、前記ス
プレラインの注水流量調節弁の上流側に注水圧力調節弁
と注水圧力調節弁バイパス弁とを並列接続するように設
け、ボイラの低負荷帯では前記注水圧力調節弁と注水圧
力調節弁バイパス弁を開弁して過熱低減器への注水量を
注水流量調節弁にて調節し、ボイラの高負荷帯では注水
圧力調節弁バイパス弁を閉弁して過熱低減器への注水量
を注水流量調節弁と注水圧力調節弁にて調節する制御手
段を設けたことを特徴とするボイラの蒸気温度制御装
置。The invention claimed in the present application to achieve the above object is as follows. (1) A water supply pump that supplies water to the boiler, a boiler evaporating unit that heats the supplied water to the superheater section as steam, and a boiler outlet superheated steam that is sent from the superheater section of the boiler to the outside. A superheat reducer for adjusting the temperature, a spray line for supplying water to the superheat reducer, and the amount of water injected to the superheat reducer provided in the spray line are adjusted to control the boiler superheated steam temperature. In a steam temperature control device for a boiler equipped with a water injection flow rate control valve to be installed, a water injection pressure control valve and a water injection pressure control valve bypass valve are provided in parallel on the upstream side of the water injection flow rate control valve of the spray line. In the low load zone, the water injection pressure control valve and the water injection pressure control valve bypass valve are opened, and the water injection amount to the superheat reducer is adjusted by the water injection flow rate control valve.In the high load zone of the boiler, the water injection pressure control valve bypass Steam temperature control system of the boiler, characterized in that a control means for adjusting the amount of injected water to desuperheater and closes the valves at the water injection flow control valve the water injection pressure regulating valve.
【０００６】（２）給水ポンプにより供給された給水を
加熱して所定温度の過熱蒸気として外部に送給するボイ
ラと、ボイラ後流域の蒸気管路に設けられた過熱低減器
と、給水ポンプから送出されたスプレ水を過熱低減器に
供給するスプレラインと、該スプレラインに設けられた
前記過熱低減器への注水量を調節してボイラ出口過熱蒸
気温度を制御する注水流量調節弁とを備えたボイラの蒸
気温度制御装置において、前記スプレラインの注水流量
調節弁の上流域に注水圧力調節弁と注水圧力調節弁バイ
パス弁とを並列接続的に設け、ボイラ低負荷帯では、前
記注水圧力調節弁バイパス弁を開弁し、この開弁に伴い
注水流量調節弁の弁開度を減ずる方向に調整するととも
に前記注水圧力調節弁を全開する制御手段を設け、ボイ
ラ高負荷帯では、前記注水圧力調節弁バイパス弁を閉弁
し、この閉弁に伴い注水流量調節弁の弁開度を増す方向
に調節するとともに、前記注水圧力調節弁開度を前記ス
プレ流量調節弁前後の差圧が所定値になるように調節す
る制御手段を設けたことを特徴とするボイラの蒸気温度
制御装置。(2) A boiler that heats the feed water supplied by the feed water pump and sends it as superheated steam of a predetermined temperature to the outside, an overheat reducer provided in a steam pipeline in the downstream region of the boiler, and a feed water pump. A spray line that supplies the delivered spray water to the superheat reducer, and a water injection flow rate control valve that controls the boiler outlet superheated steam temperature by adjusting the amount of water injected to the superheat reducer provided in the spray line In the steam temperature control device of the boiler, a water injection pressure control valve and a water injection pressure control valve bypass valve are provided in parallel in the upstream region of the water injection flow rate control valve of the spray line, and the water injection pressure control is performed in the boiler low load zone. By opening the valve bypass valve, adjust the valve opening of the water injection flow rate control valve in the direction of decreasing with this opening and provide a control means for fully opening the water injection pressure control valve, in the boiler high load zone, Note: The water injection pressure control valve bypass valve is closed, and along with this closing, the valve opening of the water injection flow rate control valve is adjusted to increase, and the water injection pressure control valve opening is adjusted to the differential pressure before and after the spray flow rate control valve. A steam temperature control device for a boiler, characterized in that it is provided with a control means for adjusting so that the temperature becomes a predetermined value.
【０００７】（３）（１）または（２）において、前記
注水流量調節弁の弁開度が所定の弁開度以下においてそ
の閉弁速度を減ずる調整手段を設けたことを特徴とする
ボイラの蒸気温度制御装置。(3) In the boiler according to (1) or (2), there is provided an adjusting means for reducing the valve closing speed when the valve opening of the water injection flow rate control valve is equal to or smaller than a predetermined valve opening. Steam temperature control device.
【０００８】[0008]
【発明の実施の形態】本発明の系統を図１に示す。ボイ
ラの系統は脱気器からの給水を給水ポンプ１、高圧給水
加熱器２、節炭器３、ドラム４、１次過熱器５、２次過
熱器６を経てタービンへ送るよう系統構成されている。
ボイラの過熱器５、６間に設置の過熱低減器１０により
蒸気温度を調整するスプレ系統は、本発明によるボイラ
給水ポンプ１出口から取出したスプレライン７に、注水
圧力調節弁８と、これと並列に注水圧力調節弁バイパス
弁１２が設置されている。なお、該バイパス弁１２は前
記弁８に比しきわめて大容量であり、弁１２を全開する
と、弁１２の通過流動抵抗および圧力損失ではゼロと考
えてよい。注水流量調節弁９の制御性を良好にするため
に注水流量調節弁９の前後差圧を監視する注水差圧発信
器１１を設けている。通常はこの注水差圧発信器１１の
示す差圧がほぼ所定の一定値になるように制御する。ボ
イラユニット起動低負荷時は給水ポンプ１出口から取出
したスプレライン７の注水圧力調節弁バイパス弁１２を
全開させて、流量調節弁９、過熱低減器１０を経てスプ
レが投入され、高負荷時は圧力調節弁バイパス弁１２を
全閉させて、注水圧力調節弁８、注水流量調節弁９、過
熱低減器１０を経てスプレ水が投入される。プラント出
力がユニット起動低負荷帯と高負荷帯間で切替わる場合
には、注水流量制御をスムースに行うために、注水圧力
調節弁バイパス弁１２を開閉させる（図４の実施例では
負荷４５％で開閉している）。このとき注水圧力調節弁
バイパス弁１２開閉時の注水流量の変動を極力防止する
ために、図３に示すように、制御回路上、注水圧力調節
弁バイパス弁１２の開閉信号により先行的に注水流量調
節弁９の開度補正量を加算器２４に加える。DETAILED DESCRIPTION OF THE INVENTION The system of the present invention is shown in FIG. The boiler system is configured so that the feed water from the deaerator is sent to the turbine via the feed pump 1, the high pressure feed water heater 2, the economizer 3, the drum 4, the primary superheater 5 and the secondary superheater 6. There is.
The spray system for adjusting the steam temperature by the superheat reducer 10 installed between the superheaters 5 and 6 of the boiler is a spray line 7 extracted from the outlet of the boiler feed pump 1 according to the present invention, and a water injection pressure control valve 8 and A water injection pressure control valve bypass valve 12 is installed in parallel. The bypass valve 12 has an extremely large capacity as compared with the valve 8, and when the valve 12 is fully opened, it can be considered that the passage flow resistance and the pressure loss of the valve 12 are zero. In order to improve the controllability of the water injection flow rate control valve 9, a water injection differential pressure transmitter 11 that monitors the differential pressure across the water injection flow rate control valve 9 is provided. Normally, control is performed so that the differential pressure indicated by the water injection differential pressure transmitter 11 becomes substantially a predetermined constant value. Boiler unit startup When the load is low, the water injection pressure control valve bypass valve 12 of the spray line 7 extracted from the outlet of the water supply pump 1 is fully opened, and the spray is thrown through the flow rate control valve 9 and the superheat reducer 10. The pressure control valve bypass valve 12 is fully closed, and spray water is introduced through the water injection pressure control valve 8, the water flow rate control valve 9, and the superheat reducer 10. When the plant output is switched between the unit start low load zone and the high load zone, the water injection pressure control valve bypass valve 12 is opened and closed in order to smoothly perform the water injection flow rate control (load 45% in the embodiment of FIG. 4). Open and close). At this time, in order to prevent fluctuations in the water injection flow rate when opening and closing the water injection pressure control valve bypass valve 12 as much as possible, as shown in FIG. The opening correction amount of the control valve 9 is added to the adder 24.
【０００９】注水圧力調節弁バイパス弁１２は規定負荷
到達時（図４の実施例では約４５％負荷時）に閉動作す
るが、このとき注水流量調節弁９の弁差圧は急低下する
ため、注水流量調節弁９の開度を上げる方向に補正する
ように注水圧力調節弁バイパス弁閉側の補正設定器２８
により行う。設定器２７は、バイパス弁開側補正設定器
で注水圧力調節弁バイパス弁１２の弁開時に行う。切替
器２５、２６は、信号切替器で注水圧力調節弁バイパス
弁開閉時に動作する。The water injection pressure control valve bypass valve 12 closes when the specified load is reached (about 45% load in the embodiment of FIG. 4), but at this time, the valve differential pressure of the water injection flow control valve 9 drops sharply. , The correction setter 28 on the side where the water injection pressure adjusting valve bypass valve is closed so as to correct the opening degree of the water injection flow rate adjusting valve 9
By. The setting device 27 is a bypass valve opening side correction setting device, and is performed when the water injection pressure control valve bypass valve 12 is opened. The switching devices 25 and 26 are signal switching devices and operate when the water injection pressure control valve bypass valve is opened and closed.
【００１０】低負荷帯での制御動作は注水圧力調節弁バ
イパス弁１２は全開動作とし、注水圧力調節弁８は注水
流量調節弁９の有効差圧を確保するために低負荷帯では
全開動作させて（設定器３５、切替器３４により注水圧
力調節弁８を全開させる）、注水流量調節弁９により蒸
気温度を調節する。高負荷帯では注水圧力調節弁バイパ
ス弁１２は全閉として、注水圧力調節弁８により注水流
量調節弁９の前後差圧を規定値に制御し、注水流量調節
弁９の弁開度を制御範囲内（２０〜８０％）に入るよう
にし、制御性を良好になるようにする。高負荷帯では、
差圧発信器１１により注水流量調節弁９前後差圧を監視
し、減算器３２、信号設定器３１、比例積分器（調節
弁）３３により注水圧力調節弁８を調整する。２３、３
６は自動・手動切替器である。さらに、万一注水流量調
節弁９の開度が１０％以下に達したときは速度変換器２
９および関数発生器３０により弁閉レートを遅くし、注
水流量調節弁９がＯＮ−ＯＦＦとならないように防止を
図る。図２の実施例では速度変換器２９の出力は関数発
生器３０に入力され、弁開度１０％以下では弁閉レート
は２％／分、１０〜１１％では２〜１００％／分と変化
し、弁開度１１％以上では弁閉レートは１００％／分と
なっている。これにより高範囲負荷変化において良好な
蒸気温度制御ができ、かつ過熱低減器を損傷することな
く安全に運転することができる。The control operation in the low load zone is such that the water injection pressure control valve bypass valve 12 is fully opened and the water injection pressure control valve 8 is fully opened in the low load zone to secure an effective differential pressure of the water injection flow rate control valve 9. (The water injection pressure adjusting valve 8 is fully opened by the setting device 35 and the switching device 34), and the steam temperature is adjusted by the water injection flow amount adjusting valve 9. In the high load zone, the water injection pressure control valve bypass valve 12 is fully closed and the water injection pressure control valve 8 controls the differential pressure across the water injection flow rate control valve 9 to a specified value, and the valve opening degree of the water injection flow rate control valve 9 is within the control range. (20 to 80%) to improve controllability. In the high load zone,
The differential pressure transmitter 11 monitors the differential pressure across the water injection flow control valve 9, and the subtractor 32, the signal setter 31, and the proportional integrator (control valve) 33 adjust the water injection pressure control valve 8. 23, 3
6 is an automatic / manual switch. Furthermore, if the opening degree of the water injection flow rate control valve 9 reaches 10% or less, the speed converter 2
The valve closing rate is slowed by 9 and the function generator 30 to prevent the water injection flow rate control valve 9 from being turned ON-OFF. In the embodiment of FIG. 2, the output of the speed converter 29 is input to the function generator 30, and the valve closing rate changes to 2% / min when the valve opening is 10% or less and 2 to 100% / min when 10-11%. However, when the valve opening is 11% or more, the valve closing rate is 100% / min. As a result, good steam temperature control can be performed in a high range load change, and safe operation can be performed without damaging the superheat reducer.
【００１１】注水流量調節弁開度特性、圧力特性の一例
を図４に示す。図４において、注水点圧力とは注水流量
調節弁９の入口圧力である。なお、図２および図３にお
いて、先行回路２２はボイラまたはタービン負荷信号を
受けて、先行的に弁９に与えられる開度信号を発生する
回路である。高範囲負荷変化のときに起動低負荷帯では
注水流量調節弁９により温度制御し、高負荷帯では注水
圧力調節弁８と注水流量調節弁９により制御することに
より、全負荷域にわたり蒸気温度の制御を良好に行うこ
とが可能となる。また、注水流量調節弁９の開度が１０
％以下に達すると調節弁を徐閉させるため、注水流量調
節弁のＯＮ−ＯＦＦ動作回数を従来に較べて約１／１０
低減でき、過熱低減器の損傷防止を図ることができる。An example of the opening characteristic of the water injection flow control valve and the pressure characteristic is shown in FIG. In FIG. 4, the water injection point pressure is the inlet pressure of the water injection flow rate control valve 9. 2 and 3, the preceding circuit 22 is a circuit that receives a boiler or turbine load signal and generates an opening signal that is given to the valve 9 in advance. Starting at the time of high range load change Temperature control by the water injection flow rate control valve 9 in the low load zone, and control by the water injection pressure control valve 8 and the water injection flow rate control valve 9 in the high load zone to control the steam temperature over the entire load range. It becomes possible to perform good control. Moreover, the opening degree of the water injection flow rate control valve 9 is 10
Since the control valve is gradually closed when it reaches less than%, the number of ON-OFF operations of the water injection flow rate control valve is about 1/10 compared to the conventional case.
Therefore, damage to the overheat reducer can be prevented.
【００１２】以上述べたように、本発明においては過熱
低減器１０の注水流量調節弁９のＯＮ−ＯＦＦ回数の低
減を図るためにボイラユニット起動の低負荷運転時は注
水圧力調節弁バイパス弁１２を全開させて、注水流量調
節弁９の有効差圧を確保する。また、高負荷運転時は注
水圧力調節弁バイパス弁１２を全閉させて注水圧力調節
弁８により注水流量調節弁９前後の差圧を規定値にする
こと、および注水流量調節弁９の開度が例えば１０％以
下になったら徐閉する回路の設置により注水流量調節弁
９のＯＮ−ＯＦＦ回数を従来に較べて約１／１０程度に
低減することができる。この結果、過熱低減器を損傷す
ることなく安全に蒸気温度の調整を行うことが可能にな
る。As described above, in the present invention, in order to reduce the number of times the water injection flow rate control valve 9 of the overheat reducer 10 is turned on and off, the water injection pressure control valve bypass valve 12 is operated during low load operation of the boiler unit. Is fully opened to secure an effective differential pressure of the water injection flow rate control valve 9. Further, during high-load operation, the water injection pressure control valve bypass valve 12 is fully closed to set the differential pressure before and after the water injection flow rate control valve 9 to a specified value by the water injection pressure control valve 8, and the opening degree of the water injection flow rate control valve 9. However, the number of times the water injection flow rate control valve 9 is turned on and off can be reduced to about 1/10 of that of the conventional case by installing a circuit that gradually closes when 10% or less. As a result, the steam temperature can be adjusted safely without damaging the superheat reducer.
【００１３】[0013]
【発明の効果】本発明によれば注水流量調節弁のＯＮ−
ＯＦＦ回数低減を図ることができるので、高範囲負荷変
化に対しても過熱低減器を損傷することなく安全に蒸気
温度調整を行うことができる。According to the present invention, the water flow rate control valve is turned on.
Since the number of times of turning off can be reduced, the steam temperature can be adjusted safely without damaging the overheat reducer even when the load changes in a high range.
【図１】本発明の実施例になる過熱低減器を有するボイ
ラ系統図。FIG. 1 is a boiler system diagram having an overheat reducer according to an embodiment of the present invention.
【図２】本発明の実施例になる過熱低減器への注水制御
系統図。FIG. 2 is a water injection control system diagram for an overheat reducer according to an embodiment of the present invention.
【図３】従来の過熱低減器への注水制御系統図。FIG. 3 is a water injection control system diagram for a conventional overheat reducer.
【図４】本発明の実施例および従来技術における注水流
量調節弁開度特性図。FIG. 4 is a characteristic diagram of opening degree of water injection flow rate control valve in the embodiment of the present invention and the prior art.
【図５】過熱低減器を有する従来のボイラ系統図。FIG. 5 is a conventional boiler system diagram having an overheat reducer.
１…ボイラ給水ポンプ、２…高圧給水加熱器、３…節炭
器、４…ドラム、５…１次過熱器、６…２次過熱器、７
…スプレライン、８…注水圧力調節弁、９…注水流量調
節弁、１０…過熱低減器、１１…差圧発信器、１２…注
水圧力調節弁バイパス弁、１７…蒸気温度検出器、１８
…減算器、１９…信号（蒸気温度）設定器、２０…比例
・積分器（調節計）、２１…加算器、２２…先行回路演
算器、２３…自動・手動切替器、２４…加算器、２５…
切替器（弁開用）、２６…切替器（弁閉用）、２７…信
号設定器（弁開用）、２８…信号設定器（弁閉用）、２
９…速度変換器、３０…関数発生器、３１…信号設定
器、３２…減算器、３３…比例・積分器（調節計）、３
４…切替器、３５…信号設定器、３６…自動・手動切替
器。1 ... Boiler feed pump, 2 ... High-pressure feed heater, 3 ... Economizer, 4 ... Drum, 5 ... Primary superheater, 6 ... Secondary superheater, 7
... Spray line, 8 ... Water injection pressure control valve, 9 ... Water injection flow rate control valve, 10 ... Superheat reducer, 11 ... Differential pressure transmitter, 12 ... Water injection pressure control valve bypass valve, 17 ... Steam temperature detector, 18
... Subtractor, 19 ... Signal (steam temperature) setter, 20 ... Proportional / integrator (controller), 21 ... Adder, 22 ... Preceding circuit calculator, 23 ... Automatic / manual switcher, 24 ... Adder, 25 ...
Switching device (for valve opening), 26 ... Switching device (for valve closing), 27 ... Signal setting device (for valve opening), 28 ... Signal setting device (for valve closing), 2
9 ... Velocity converter, 30 ... Function generator, 31 ... Signal setting device, 32 ... Subtractor, 33 ... Proportional / integrator (controller), 3
4 ... switching device, 35 ... signal setting device, 36 ... automatic / manual switching device.
Claims (3)
供給された給水を加熱して蒸気として過熱器部へ供給す
るボイラ蒸発部と、ボイラの過熱器部から外部へ送給さ
れるボイラ出口過熱蒸気温度を調節するための過熱低減
器と、前記過熱低減器への注水を供給するスプレライン
と、スプレラインに設けられた前記過熱低減器への注水
量を調節してボイラ出口過熱蒸気温度を制御する注水流
量調節弁とを備えたボイラの蒸気温度制御装置におい
て、前記スプレラインの注水流量調節弁の上流側に注水
圧力調節弁と注水圧力調節弁バイパス弁とを並列接続す
るように設け、ボイラの低負荷帯では前記注水圧力調節
弁と注水圧力調節弁バイパス弁を開弁して過熱低減器へ
の注水量を注水流量調節弁にて調節し、ボイラの高負荷
帯では注水圧力調節弁バイパス弁を閉弁して過熱低減器
への注水量を注水流量調節弁と注水圧力調節弁にて調節
する制御手段を設けたことを特徴とするボイラの蒸気温
度制御装置。1. A water supply pump for supplying water to a boiler,
A boiler evaporating unit that heats the supplied feed water as steam to the superheater unit, a superheat reducer for adjusting the boiler outlet superheated steam temperature sent from the superheater unit of the boiler to the outside, and the superheat Steam temperature of the boiler equipped with a spray line for supplying water to the reducer, and a water injection flow rate control valve for controlling the boiler outlet superheated steam temperature by adjusting the amount of water injected to the superheat reducer provided in the spray line In the control device, a water injection pressure control valve and a water injection pressure control valve bypass valve are installed in parallel on the upstream side of the water injection flow control valve of the spray line, and the water injection pressure control valve and the water injection pressure are set in the low load zone of the boiler. Control valve Bypass valve is opened and the amount of water injected to the superheat reducer is adjusted by the water injection flow rate control valve, and in the high load zone of the boiler, water injection pressure control valve Bypass valve is closed and the amount of water injected to the superheat reducer Pouring flow Steam temperature control system of the boiler, characterized in that a control means for adjusting at adjustment valve and the water injection pressure regulating valve.
して所定温度の過熱蒸気として外部に送給するボイラ
と、ボイラ後流域の蒸気管路に設けられた過熱低減器
と、給水ポンプから送出されたスプレ水を過熱低減器に
供給するスプレラインと、該スプレラインに設けられた
前記過熱低減器への注水量を調節してボイラ出口過熱蒸
気温度を制御する注水流量調節弁とを備えたボイラの蒸
気温度制御装置において、前記スプレラインの注水流量
調節弁の上流域に注水圧力調節弁と注水圧力調節弁バイ
パス弁とを並列接続的に設け、ボイラ低負荷帯では、前
記注水圧力調節弁バイパス弁を開弁し、この開弁に伴い
注水流量調節弁の弁開度を減ずる方向に調整するととも
に前記注水圧力調節弁を全開する制御手段を設け、ボイ
ラ高負荷帯では、前記注水圧力調節弁バイパス弁を閉弁
し、この閉弁に伴い注水流量調節弁の弁開度を増す方向
に調節するとともに、前記注水圧力調節弁開度を前記ス
プレ流量調節弁前後の差圧が所定値になるように調節す
る制御手段を設けたことを特徴とするボイラの蒸気温度
制御装置。2. A boiler that heats feed water supplied by a feed water pump and sends it as superheated steam of a predetermined temperature to the outside, an overheat reducer provided in a steam pipeline in the downstream region of the boiler, and a feed water pump. A spray line for supplying the spray water to the superheat reducer, and a water injection flow rate control valve for controlling the boiler outlet superheated steam temperature by adjusting the amount of water injected to the superheat reducer provided in the spray line were provided. In the steam temperature control device of the boiler, a water injection pressure control valve and a water injection pressure control valve bypass valve are provided in parallel upstream of the water injection flow rate control valve of the spray line, and in the boiler low load zone, the water injection pressure control valve is provided. The bypass valve is opened, and with this opening, there is provided a control means for adjusting the valve opening of the water injection flow rate control valve in a direction to decrease it and fully opening the water injection pressure control valve. Close the water pressure control valve bypass valve, and adjust the valve opening degree of the water injection flow rate control valve to increase with this closing, and adjust the water injection pressure control valve opening to the differential pressure before and after the spray flow rate control valve. A steam temperature control device for a boiler, characterized in that a control means for adjusting the steam temperature to a predetermined value is provided.
量調節弁の弁開度が所定の弁開度以下においてその閉弁
速度を減ずる調整手段を設けたことを特徴とするボイラ
の蒸気温度制御装置。3. The steam temperature control for a boiler according to claim 1, further comprising adjusting means for reducing the valve closing speed when the valve opening of the water injection flow control valve is equal to or smaller than a predetermined valve opening. apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24778695A JP3693265B2 (en) | 1995-09-26 | 1995-09-26 | Boiler steam temperature control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24778695A JP3693265B2 (en) | 1995-09-26 | 1995-09-26 | Boiler steam temperature control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0989209A true JPH0989209A (en) | 1997-04-04 |
| JP3693265B2 JP3693265B2 (en) | 2005-09-07 |
Family
ID=17168636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24778695A Expired - Fee Related JP3693265B2 (en) | 1995-09-26 | 1995-09-26 | Boiler steam temperature control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3693265B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012082971A (en) * | 2010-10-06 | 2012-04-26 | Mitsubishi Heavy Ind Ltd | Boiler, gas turbine combined cycle plant, and temperature control method |
-
1995
- 1995-09-26 JP JP24778695A patent/JP3693265B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012082971A (en) * | 2010-10-06 | 2012-04-26 | Mitsubishi Heavy Ind Ltd | Boiler, gas turbine combined cycle plant, and temperature control method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3693265B2 (en) | 2005-09-07 |
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