JPH11294112A - Control device for private thermal power generation plant - Google Patents
Control device for private thermal power generation plantInfo
- Publication number
- JPH11294112A JPH11294112A JP11617398A JP11617398A JPH11294112A JP H11294112 A JPH11294112 A JP H11294112A JP 11617398 A JP11617398 A JP 11617398A JP 11617398 A JP11617398 A JP 11617398A JP H11294112 A JPH11294112 A JP H11294112A
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- Japan
- Prior art keywords
- steam
- paper
- pressure
- low
- signal
- 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.)
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- Control Of Turbines (AREA)
- Paper (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、火力自家発電プラ
ントの制御装置に関し、詳しくは、製紙工場に設置され
る火力自家発電プラントの蒸気を製紙工程の紙切れに対
応して自動制御する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 control device for a thermal power plant, and more particularly to a device for automatically controlling the steam of a thermal power plant installed in a paper mill in response to a paper break in a papermaking process. It is.
【０００２】[0002]
【従来の技術】火力自家発電プラントを有する製紙工場
では、発電に用いて低圧となった蒸気を製紙工程で使用
するようにしている。この製紙工程では、抄紙機がしば
しば紙切れを起こし、このときは低圧蒸気は不要となる
ため、不要となった余剰蒸気を一時的に逃してやる必要
がある。このような紙切れの際の大量の余剰蒸気の処理
のため（通常時も製紙工程での蒸気使用量が変動するの
でその対策のためでもある）に、図４に示すような手段
がとられている。2. Description of the Related Art In a paper mill having an in-house thermal power plant, low-pressure steam used for power generation is used in a papermaking process. In this papermaking process, the paper machine often breaks out of the paper, and in this case, the low-pressure steam becomes unnecessary. Therefore, it is necessary to temporarily escape the unnecessary excess steam. In order to treat a large amount of excess steam at the time of such paper breakage (which is also a countermeasure because the amount of steam used in the papermaking process fluctuates during normal times), means shown in FIG. 4 is taken. I have.
【０００３】図４において、発電機１のタービンの高圧
段２にはボイラ６から高圧蒸気を供給する。高圧段２と
低圧段３の間には抽気弁４を設け、この抽気弁４で低圧
蒸気圧力を一定に保つよう制御することにより、低圧蒸
気を低圧段３に逃している。さらに、高圧段２を出た低
圧蒸気は製紙工程７に送られる。紙切れ等により蒸気が
余剰となって、低圧蒸気圧力が上昇すると、大気放出弁
５が開いて蒸気放出口５０より低圧蒸気を大気中に逃す
ようになっている。In FIG. 4, high-pressure steam is supplied from a boiler 6 to a high-pressure stage 2 of a turbine of a generator 1. A bleed valve 4 is provided between the high-pressure stage 2 and the low-pressure stage 3, and the low-pressure steam is released to the low-pressure stage 3 by controlling the bleed valve 4 to keep the low-pressure steam pressure constant. Further, the low-pressure steam leaving the high-pressure stage 2 is sent to a papermaking process 7. When the low pressure vapor pressure rises due to excess steam due to paper breakage or the like, the atmospheric discharge valve 5 is opened to allow the low pressure vapor to escape from the vapor discharge port 50 into the atmosphere.
【０００４】[0004]
【発明が解決しようとする課題】一般に、製紙工場にお
ける電力系統は、図５に示すように火力自家発電用の発
電機１、遮断器９の系統と、電力会社（商用電力）８、
遮断器１０の系統とが並列で運用されるようになってい
る。タービンの低圧段３に流れる蒸気が多くなると発電
機１の出力が増加するため、その分電力会社８の系統か
らの買電は減少する。ところが、電力会社系統の遮断器
１０を「切」に設定し、買電の供給は受けない自家発電
単独運転をしている場合、製紙工場の使用電力と、発電
機１による自家発電電力とが一致しており、発電機１の
出力をそれ以上増やすことはできない。Generally, as shown in FIG. 5, a power system in a paper mill is composed of a generator 1 and a circuit breaker 9 for thermal power generation, a power system (commercial power) 8,
The system of the circuit breaker 10 is operated in parallel. When the amount of steam flowing through the low-pressure stage 3 of the turbine increases, the output of the generator 1 increases, and accordingly, the amount of power purchased from the system of the power company 8 decreases. However, in the case where the circuit breaker 10 of the power company system is set to “OFF” and the private power generation alone is operated without receiving the power purchase, the power used in the paper mill and the private power generated by the generator 1 are different. They match, and the output of the generator 1 cannot be further increased.
【０００５】このような運転状態において、高圧段２に
入るボイラ６からの高圧蒸気を減少させれば、発電機１
の出力を一定に保つことができるが、微粉炭等を燃料と
するボイラ６は、急速には発生蒸気量を変動させること
ができない。また、図４における大気放出弁５は、一般
に補助的に用いられるものであり、急速な低圧蒸気の変
動には追従できない。製紙工程７における紙切れが復旧
する際、定常時の１．５〜２倍程度の蒸気が一気に消費
されるため、紙切れ時の余剰分の蒸気のみを大気放出
し、紙切れ復旧と共に大気放出弁５を閉じるようにした
場合は蒸気が不足することは免れない。In such an operating state, if the high-pressure steam from the boiler 6 entering the high-pressure stage 2 is reduced, the generator 1
Can be kept constant, but the boiler 6 using pulverized coal or the like cannot rapidly change the amount of generated steam. In addition, the air release valve 5 in FIG. 4 is generally used as an auxiliary, and cannot follow a rapid change in low-pressure steam. When the paper breakage in the papermaking process 7 is restored, about 1.5 to 2 times as much steam as in the steady state is consumed at a stretch, so only the excess steam at the time of the paper breakage is released to the atmosphere. If closed, steam is inevitable.
【０００６】また、紙切れ復旧時は、復旧信号が来る前
に蒸気が消費され始めるため、大気放出弁５を閉じるタ
イミングの見極めが困難である。したがって、従来は、
これらの機能を自動化することができないため、運転員
の経験に基づいて手動で大気放出弁を操作していた。本
発明は、このような問題に鑑みてなされたものであっ
て、その目的とするところは、特に、製紙工程の紙切れ
による消費蒸気の変動に自動的に対応できる火力自家発
電プラントの制御装置を提供するにある。[0006] Further, at the time of paper-out recovery, since steam starts to be consumed before the recovery signal comes, it is difficult to determine the timing of closing the air release valve 5. Therefore, conventionally,
Since these functions cannot be automated, the air release valve has been manually operated based on the operator's experience. The present invention has been made in view of such a problem, and an object of the present invention is to provide a control device for a thermal power generation plant capable of automatically responding to fluctuations in consumed steam due to paper running out in a papermaking process. To offer.
【０００７】[0007]
【課題を解決するための手段】かかる課題を解決するた
め、本発明は、高圧段と低圧段のタービンにより駆動さ
れる発電機を有する火力自家発電プラントを用い、発電
に使用されて低圧となった蒸気を製紙工程で使用するよ
うにした火力自家発電プラントの制御装置において、前
記高圧段と低圧段の間に設けられた抽気弁を制御するこ
とにより抽気圧力を制御するタービンガバナの抽気弁開
度指令信号と、低圧蒸気ラインからの低圧蒸気圧力信号
と、製紙工程における紙切れ発生信号とをコンピュータ
に入力し、該コンピュータで前記製紙工程の消費蒸気の
変化に応じた大気放出弁開度を算出して大気放出弁を制
御することにより、前記抽気弁の開度を一定に保って製
紙工程の紙切れによる蒸気消費の変化に応じた低圧蒸気
の制御を行なうことを特徴とする。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention uses a thermal power generation plant having a generator driven by a high-pressure stage and a low-pressure stage turbine, and is used for power generation to reduce the pressure. In the control device of the thermal power plant in which the steam is used in the papermaking process, the bleed valve of the turbine governor that controls the bleed pressure by controlling the bleed valve provided between the high pressure stage and the low pressure stage is opened. Degree command signal, a low-pressure steam pressure signal from the low-pressure steam line, and a paper breakage occurrence signal in the papermaking process are input to a computer, and the computer calculates an atmospheric release valve opening according to a change in steam consumed in the papermaking process. By controlling the air release valve in such a manner, the opening of the bleed valve is kept constant, and low-pressure steam can be controlled in accordance with a change in steam consumption due to a paper shortage in the papermaking process. The features.
【０００８】又、紙切れ発生時には、前記製紙工程から
の紙切れ発生信号に基づいて前記大気放出弁を急速開と
した後紙切れ復旧時の必要蒸気相当分だけ徐々に開とす
る２段階で開度を制御し、紙切れ復旧時には、前記ター
ビンガバナより出力される抽気弁開度指令信号により抽
気弁開度を一定に保って発電機出力を一定するように前
記大気放出弁を蒸気消費量に応じて開度制御するように
している。In addition, when a paper break occurs, the air release valve is rapidly opened based on a paper break signal from the paper making process, and then the opening is gradually opened by an amount corresponding to the necessary steam at the time of paper break recovery. When the paper is out of paper, the air release valve is opened according to the steam consumption so that the bleed valve opening is kept constant by the bleed valve opening command signal output from the turbine governor and the generator output is kept constant. The degree is controlled.
【０００９】本発明では、大気放出弁は通常時は、全閉
となっており、製紙工程において紙切れにより余剰蒸気
が発生すると、紙切れ発生信号がコンピュータに通知さ
れ、固定開度指令制御部からの出力で大気放出弁を急速
開放して余剰蒸気相当分を大気中に放出する。In the present invention, the air release valve is normally fully closed, and when excess steam is generated due to paper breakage in the papermaking process, a paper breakage generation signal is notified to the computer, and the fixed opening degree command control unit sends the signal. At the output, the air release valve is quickly opened to release excess steam into the atmosphere.
【００１０】その後、固定開度指令制御部の指令により
紙切れ復旧時の大量の蒸気消費に備えて大気放出弁を徐
々に開き、タービンガバナの働きにより、発電電力が一
定に保たれるように徐々にボイラの蒸発量が増加する。
そして、抽気弁開度指令信号に基づいて抽気弁開度制御
部で大気放出弁の開度を増減させ、この制御により抽気
弁の開度を一定に保ち、発電電力は変化しない。Thereafter, the air release valve is gradually opened in preparation for a large amount of steam consumption at the time of paper out recovery by the command of the fixed opening command control unit, and the generated power is gradually maintained by the action of the turbine governor. In addition, the amount of boiler evaporation increases.
Then, based on the bleed valve opening command signal, the bleed valve opening control unit increases or decreases the opening of the air release valve. By this control, the bleed valve opening is kept constant, and the generated power does not change.
【００１１】紙切れ復旧信号が来る前に、製紙工程では
蒸気を消費しはじめるが、抽気弁開度制御部による一定
制御によって、製紙工程で消費される蒸気相当分、大気
放出弁が閉じ、次いで紙切れ復旧となり、製紙工程が通
常運転に戻る。大気放出弁の開度は前記増加分開いた状
態となり、その分の大気が大気放出弁から放出される。
紙切れ復旧信号がきてから一定時間経過後、大気放出弁
を全閉とする。Before the paper-out recovery signal is received, steam starts to be consumed in the paper-making process. However, the air discharge valve is closed by an amount corresponding to the steam consumed in the paper-making process by a constant control by the bleed valve opening control unit, and then the paper is exhausted. It is restored and the papermaking process returns to normal operation. The opening of the air release valve is opened by the increase, and the air is released from the air release valve.
After a certain period of time has passed since the paper-out recovery signal comes, the air release valve is fully closed.
【００１２】従って本発明によれば、操作端としては従
来の抽気弁および大気放出弁をそのまま用いて精度の高
い紙切れ対策の制御装置が構成できると共に、大気放出
弁の開閉操作が完全自動化され、紙切れ復旧時における
大気放出弁閉操作のタイミングを見極めて手動で操作す
るという従来の手間がなくなり、火力自家発電プラント
の運転操作が安全、確実に行なえる。Therefore, according to the present invention, a high-precision control device for paper cut-out countermeasures can be constituted by using the conventional bleed valve and the air release valve as the operation end as they are, and the opening / closing operation of the air release valve is completely automated. This eliminates the conventional labor of manually checking the timing of the operation of closing the air release valve when the paper runs out, and allows the operation of the thermal power generation plant to be performed safely and reliably.
【００１３】[0013]
【発明の実施の形態】以下に図面を参照して本発明の実
施の形態を例示的に説明する。ただし、この実施の形態
に記載されている構造部品の寸法、材質、形状、相対位
置などは特に特定的な記載がない限りは、この発明の範
囲をそれのみに限定する趣旨ではなく、単なる説明例に
過ぎない。なお、図４と同一部材または同一機能のもの
は同一符号で示している。Embodiments of the present invention will be described below with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative positions, and the like of the structural components described in this embodiment are not intended to limit the scope of the present invention thereto, unless otherwise specified. It is only an example. The same members or those having the same functions as those in FIG. 4 are denoted by the same reference numerals.
【００１４】図１において、１は発電機、２はタービン
の高圧段、３はタービンの低圧段で、ボイラ６から高圧
段２に高圧蒸気が供給される。高圧段２と低圧段３との
間には抽気弁４が設けられており、この抽気弁４で低圧
蒸気圧力を一定に保つよう制御することにより、低圧蒸
気をタービンの低圧段３に逃している。高圧段２の排気
側から低圧蒸気ライン１２を介して大気放出弁５と製紙
工場における製紙工程７に接続されている。低圧蒸気ラ
イン１２には、抽気圧力計１４および低圧蒸気圧力計１
５が設けられている。In FIG. 1, 1 is a generator, 2 is a high-pressure stage of a turbine, 3 is a low-pressure stage of a turbine, and high-pressure steam is supplied from a boiler 6 to a high-pressure stage 2. A bleed valve 4 is provided between the high-pressure stage 2 and the low-pressure stage 3. By controlling the bleed valve 4 to keep the low-pressure steam pressure constant, low-pressure steam is released to the low-pressure stage 3 of the turbine. I have. From the exhaust side of the high pressure stage 2, it is connected via a low pressure steam line 12 to an atmospheric release valve 5 and a paper making process 7 in a paper mill. The low-pressure steam line 12 includes an extraction pressure gauge 14 and a low-pressure steam pressure gauge 1.
5 are provided.
【００１５】抽気圧力計１４の出力信号はタービンガバ
ナ１６に入力され、このタービンガバナ１６で抽気圧力
一定制御演算を行ない、その結果を抽気開度指令信号Ｓ
1 として抽気弁４に入力させると共に、コンピュータ１
７へも分岐入力させる。コンピュータ１７には、この抽
気弁開度指令信号Ｓ1 のほか、前記低圧蒸気圧力計１５
からの低圧蒸気圧力信号Ｓ2 、および製紙工程７の紙切
れが発生したときに出力する紙切れ発生信号Ｓ3 が入力
され、これらの信号Ｓ1 、Ｓ2 、Ｓ3 に基づいて大気放
出弁開度指令信号Ｓ4 を大気放出弁５に入力して大気放
出弁５を開閉制御するようになっている。The output signal of the bleed pressure gauge 14 is input to a turbine governor 16, and the turbine governor 16 performs a bleed pressure constant control operation.
1 as input to the bleed valve 4 and the computer 1
7 is also branched and input. In addition to the bleed valve opening command signal S 1 , the computer 17 also has a low pressure steam pressure gauge 15.
The low-pressure steam pressure signal S 2 from the controller 7 and a paper break occurrence signal S 3 output when a paper break occurs in the papermaking process 7 are input. Based on these signals S 1 , S 2 , and S 3 , the opening degree of the atmospheric release valve is determined. is adapted to open and close control the air discharge valve 5 of the command signal S 4 inputted to the air discharge valve 5.
【００１６】図２は、前記コンピュータ１７の内部の制
御ブロックの詳細を示している。前記抽気弁開度指令信
号Ｓ1 が入力される抽気弁開度制御部２０と、低圧蒸気
圧力信号Ｓ2 が入力される圧力制御部２１と、紙切れ発
生信号Ｓ3 が入力される固定開度指令制御部１９を有
し、これらの各制御部１９、２０、２１からの制御信号
を切替える切替ロジック２２を備えている。この切替ロ
ジック２２の出力信号（大気放出弁開度指令信号）Ｓ4
は大気放出弁５に入力されて大気放出弁５の開度を制御
するようになっている。５０は蒸気放出口である。FIG. 2 shows details of a control block inside the computer 17. A bleed valve opening control unit 20 where the bleed valve opening command signal S 1 is input, the pressure control unit 21 for the low pressure steam pressure signal S 2 is inputted, the fixed opening is out of paper generated signal S 3 is inputted It has a command control section 19 and a switching logic 22 for switching control signals from these control sections 19, 20 and 21. The output signal of the switching logic 22 (atmospheric discharge valve opening command signal) S 4
Is input to the atmosphere release valve 5 to control the opening degree of the atmosphere release valve 5. 50 is a vapor discharge port.
【００１７】図３は、上記制御装置の動作を示すチャー
トであって、（ａ）は製紙工程での低圧蒸気使用量の変
化の一例を示すチャート、（ｂ）は大気放出弁５の開度
の変化を示すチャート、（ｃ）はボイラ発熱量および発
電機出力の変化を示すチャートである。FIGS. 3A and 3B are charts showing the operation of the control device, in which FIG. 3A shows an example of a change in the amount of low-pressure steam used in the papermaking process, and FIG. And (c) is a chart showing changes in boiler calorific value and generator output.
【００１８】図３（ｂ）において、大気放出弁５は通常
時はコンピュータ１７の圧力制御部２１の制御信号によ
りほぼ全閉となっている。製紙工程７において紙切れに
より余剰蒸気が発生すると、それが低圧蒸気ライン１２
内の圧力上昇となって現れるよりも早く、紙切れ発生信
号Ｓ3 が製紙工程７から出て（図３（ａ）の点Ｔ1 ）、
この信号Ｓ3 がコンピュータ１７に通知され、固定開度
指令制御部１９からの出力で切替ロジック２２から固定
開度指令を出力し、この出力で大気放出弁５を急速開放
して余剰蒸気相当分を大気中に放出する。In FIG. 3B, the atmospheric release valve 5 is almost completely closed by a control signal of the pressure control unit 21 of the computer 17 in a normal state. When surplus steam is generated due to paper breakage in the papermaking process 7, it is
Faster than appear as the pressure rise in the inner, piece of paper generated signal S 3 is out of the paper making process 7 (FIG. 3 point T 1 of the (a)),
The signal S 3 is notified to the computer 17, and outputs a fixed opening command from the switching logic 22 at the output from the fixed opening degree command control unit 19, excess steam equivalent rapidly opening the atmospheric release valve 5 in this output Releases into the atmosphere.
【００１９】その後、図３（ｂ）に示すように、固定開
度指令制御部１９の指令により、紙切れ復旧時の大量の
蒸気消費に備えて開度が＋αだけ増加するまで大気放出
弁５を徐々に開く。このとき、抽気圧力計１４からの信
号に基づくタービンガバナ１６の働きにより、発電電力
が一定に保たれるように徐々にボイラ６の蒸発量も徐々
に増加する（図３（ｃ））。そして、大気放出弁５は＋
αだけ開いた後、その時点での抽気弁開度指令信号Ｓ1
に基づいて、抽気弁４の開度を一定にする抽気弁開度制
御部２０に切替えて、大気放出弁５の開度を増減させ
る。この制御により抽気弁４の開度は一定に保たれ、発
電機１による発電電力は変化しない（図３（ｃ）参
照）。Thereafter, as shown in FIG. 3 (b), the air release valve 5 is controlled by the command of the fixed opening command control unit 19 until the opening increases by + α in preparation for a large amount of steam consumption at the time of paper out recovery. Open gradually. At this time, the operation of the turbine governor 16 based on the signal from the bleed pressure gauge 14 gradually increases the evaporation amount of the boiler 6 so that the generated power is kept constant (FIG. 3C). And the atmospheric release valve 5 is +
After opening by α, the bleed valve opening degree command signal S 1 at that time
Is switched to the bleed valve opening control unit 20 for keeping the opening of the bleed valve 4 constant, and the opening of the air release valve 5 is increased or decreased. With this control, the opening of the bleed valve 4 is kept constant, and the power generated by the generator 1 does not change (see FIG. 3C).
【００２０】紙切れ復旧（オンリール）信号が来る前
に、製紙工程７では蒸気を消費し始める（図３（ａ）の
点Ｔ2 ）。これにより、低圧蒸気ライン１２の低圧蒸気
圧力が低下し始めるため、抽気圧力計１４からの信号で
タービンガバナ１６の作用により抽気弁開度指令信号Ｓ
1 が減少し始める。しかるに、抽気弁開度制御部２０に
よる抽気弁開度一定制御によって、結果的に製紙工程７
で消費される蒸気相当分、大気放出弁５が閉じてくる
（図３（ｂ）参照）。Before the paper-out recovery (on-reel) signal arrives, the papermaking process 7 begins to consume steam (point T 2 in FIG. 3A). As a result, the low-pressure steam pressure in the low-pressure steam line 12 starts to decrease, and the signal from the bleed pressure gauge 14 acts on the bleed valve opening command signal S by the action of the turbine governor 16.
One starts to decrease. However, the constant control of the bleed valve opening by the bleed valve opening control unit 20 results in the paper making process 7.
Atmospheric release valve 5 closes by an amount corresponding to the vapor consumed in (see FIG. 3B).
【００２１】次いで紙切れ復旧（図３（ａ）の点Ｔ3 ）
となり、紙切れ発生信号Ｓ3 はオフになり、少し経過後
の点Ｔ3 から製紙工程７が通常運転に戻り、大気放出弁
５は前記＋α相当分開いた状態となる。紙切れ復旧信号
がきて（点Ｔ3 ）から一定時間経過後、固定開度指令制
御部１９からの指令により徐々に大気放出弁５を全閉と
した後に前記＋α相当分開いた状態となる。それ以降は
低圧蒸気圧力計１５の低圧蒸気圧力信号Ｓ2 に基づく圧
力制御部２１の制御に戻し、上記動作を繰り返す。Next, the paper is recovered (point T 3 in FIG. 3A).
Next, the piece of paper generation signal S 3 turns off, returning to the papermaking process 7 is normal operation from the point T 3 after a lapse of little air discharge valve 5 is in a state of open the + alpha equivalent. After a lapse of a predetermined time from the paper-out recovery signal (point T 3 ), the air release valve 5 is gradually closed fully by a command from the fixed-opening-degree command control unit 19, and then is opened by an amount corresponding to the above + α. Later returned to the control of the pressure control unit 21 based on the low-pressure steam pressure signal S 2 of the low-pressure steam pressure gauge 15, the above operation is repeated.
【００２２】[0022]
【発明の効果】以上、詳述したように、本発明の火力自
家発電プラントの制御装置によれば、タービンガバナの
抽気弁開度指令信号と、低圧蒸気圧力信号と、紙切れ発
生信号とをコンピュータに入力し、製紙工程の消費蒸気
の変動に応じた大気放出弁開度を演算して大気放出弁を
制御し、抽気弁の開度を一定に保って発電電力を一定に
するように制御するようにしたので、操作端としては従
来の抽気弁および大気放出弁をそのまま用いて精度の高
い紙切れ対策の制御装置が構成できると共に、大気放出
弁の開閉操作が完全自動化され、紙切れ復旧時における
大気放出弁閉操作のタイミングを見極めて手動で操作す
るという従来の手間がなくなり、火力自家発電プラント
の運転操作が安全、確実に行なえるという効果がある。As described in detail above, according to the control apparatus for a thermal private power plant of the present invention, a computer is provided with a command signal for opening a bleed valve of a turbine governor, a low-pressure steam pressure signal, and a paper-break occurrence signal. And controls the atmospheric release valve by calculating the opening degree of the atmospheric release valve according to the fluctuation of the steam consumed in the papermaking process, and controls the generation power to be constant by keeping the opening degree of the extraction valve constant. As a result, a highly accurate control device for paper breakage can be configured by using the conventional bleed valve and air release valve as the operation end as they are, and the opening and closing operation of the air release valve is fully automated, and the air release when paper runs out is restored. This eliminates the conventional labor of manually determining the timing of the release valve closing operation and manually operating the thermal power generation plant, which has the effect of ensuring safe and reliable operation.
【図１】本発明に係る火力自家発電プラントの制御装置
の実施の形態を示す構成図である。FIG. 1 is a configuration diagram showing an embodiment of a control device for a thermal private power plant according to the present invention.
【図２】本発明装置の制御ブロック図である。FIG. 2 is a control block diagram of the device of the present invention.
【図３】本発明装置の動作を示すチャートである。FIG. 3 is a chart showing the operation of the device of the present invention.
【図４】従来の製紙工場の火力自家発電の概念図であ
る。FIG. 4 is a conceptual diagram of a conventional thermal power generation in a paper mill.
【図５】製紙工場の一般的な電力系統図である。FIG. 5 is a general power system diagram of a paper mill.
１ 発電機 ２ タービンの高圧段 ３ タービンの低圧段 ４ 抽気弁 ５ 大気放出弁 ６ ボイラ ７ 製紙工程 １６ タービンガバナ １７ コンピュータ １９ 固定開度指令制御部 ２０ 抽気弁開度制御部 ２１ 圧力制御部 Ｓ1 抽気弁開度指令信号 Ｓ2 低圧蒸気圧力信号 Ｓ3 紙切れ発生信号 Ｓ4 大気放出弁開度指令信号DESCRIPTION OF SYMBOLS 1 Generator 2 High pressure stage of turbine 3 Low pressure stage of turbine 4 Extraction valve 5 Atmospheric release valve 6 Boiler 7 Paper making process 16 Turbine governor 17 Computer 19 Fixed opening command control unit 20 Extraction valve opening control unit 21 Pressure control unit S 1 bleed valve opening command signal S 2 pressure steam pressure signal S 3 out of paper generated signal S 4 air discharge valve opening instruction signal
Claims (2)
れる発電機を有する火力自家発電プラントを用い、発電
に使用されて低圧となった蒸気を製紙工程で使用するよ
うにした火力自家発電プラントの制御装置において、 前記高圧段と低圧段の間に設けられた抽気弁を制御する
ことにより抽気圧力を制御するタービンガバナの抽気弁
開度指令信号と、低圧蒸気ラインからの低圧蒸気圧力信
号と、製紙工程における紙切れ発生信号とをコンピュー
タに入力し、該コンピュータで前記製紙工程の消費蒸気
の変化に応じた大気放出弁開度を算出して大気放出弁を
制御することにより、前記抽気弁の開度を一定に保って
製紙工程の紙切れによる蒸気消費の変化に応じた低圧蒸
気の制御を行なうことを特徴とする火力自家発電プラン
トの制御装置。1. A thermal private power plant using a thermal private power plant having a generator driven by a high-pressure stage and a low-pressure stage turbine, wherein low-pressure steam used for power generation is used in a papermaking process. In the control device, a bleed valve opening command signal of a turbine governor that controls bleed pressure by controlling a bleed valve provided between the high-pressure stage and the low-pressure stage, and a low-pressure steam pressure signal from a low-pressure steam line. By inputting an out-of-paper occurrence signal in the papermaking process to a computer, the computer calculates an air release valve opening in accordance with a change in steam consumed in the papermaking process, and controls the air release valve to thereby control the air release valve. A control device for a private thermal power plant, wherein a low pressure steam is controlled in accordance with a change in steam consumption due to a paper breakage in a paper making process while keeping an opening degree constant.
紙切れ発生信号に基づいて前記大気放出弁を急速開とし
た後紙切れ復旧時の必要蒸気相当分だけ徐々に開とする
２段階で開度を制御し、紙切れ復旧時には、前記タービ
ンガバナより出力される抽気弁開度指令信号により抽気
弁開度を一定に保って発電機出力を一定するように前記
大気放出弁を蒸気消費量に応じて開度制御することを特
徴とする請求項１記載の火力自家発電プラントの制御装
置。2. When a paper break occurs, the air release valve is rapidly opened based on a paper break occurrence signal from the paper making process, and then the opening degree is gradually increased by an amount corresponding to necessary steam at the time of paper break recovery. When the paper is out of paper, the air release valve is opened according to the steam consumption so that the bleed valve opening is kept constant by the bleed valve opening command signal output from the turbine governor and the generator output is kept constant. The control device for a private thermal power plant according to claim 1, wherein the control is performed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11617398A JPH11294112A (en) | 1998-04-09 | 1998-04-09 | Control device for private thermal power generation plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11617398A JPH11294112A (en) | 1998-04-09 | 1998-04-09 | Control device for private thermal power generation plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11294112A true JPH11294112A (en) | 1999-10-26 |
Family
ID=14680612
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11617398A Withdrawn JPH11294112A (en) | 1998-04-09 | 1998-04-09 | Control device for private thermal power generation plant |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11294112A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871370A (en) * | 2010-06-18 | 2010-10-27 | 赵仁平 | Waste steam and heat content comprehensive utilization system for self-supply power plant and application in paper industry |
| CN106988809A (en) * | 2017-03-21 | 2017-07-28 | 华电电力科学研究院 | A kind of the Systemic Burden self-regulation structure of extraction steam for factories net source one and its adjusting method |
| JP2019007391A (en) * | 2017-06-22 | 2019-01-17 | 住友金属鉱山株式会社 | Steam extraction control method for steam turbine generator |
-
1998
- 1998-04-09 JP JP11617398A patent/JPH11294112A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871370A (en) * | 2010-06-18 | 2010-10-27 | 赵仁平 | Waste steam and heat content comprehensive utilization system for self-supply power plant and application in paper industry |
| CN106988809A (en) * | 2017-03-21 | 2017-07-28 | 华电电力科学研究院 | A kind of the Systemic Burden self-regulation structure of extraction steam for factories net source one and its adjusting method |
| CN106988809B (en) * | 2017-03-21 | 2019-07-02 | 华电电力科学研究院有限公司 | A kind of one Systemic Burden self-regulation structure of extraction steam for factories net source and its adjusting method |
| JP2019007391A (en) * | 2017-06-22 | 2019-01-17 | 住友金属鉱山株式会社 | Steam extraction control method for steam turbine generator |
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Legal Events
| Date | Code | Title | Description |
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| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20050705 |