JPS63227909A - Method for turbine governor valve warming up control - Google Patents
Method for turbine governor valve warming up controlInfo
- Publication number
- JPS63227909A JPS63227909A JP6092787A JP6092787A JPS63227909A JP S63227909 A JPS63227909 A JP S63227909A JP 6092787 A JP6092787 A JP 6092787A JP 6092787 A JP6092787 A JP 6092787A JP S63227909 A JPS63227909 A JP S63227909A
- Authority
- JP
- Japan
- Prior art keywords
- steam
- valve
- temperature
- control
- bypass valve
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 22
- 238000010792 warming Methods 0.000 title abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 30
- 238000012544 monitoring process Methods 0.000 claims description 14
- 239000012530 fluid Substances 0.000 claims description 2
- 230000008646 thermal stress Effects 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Landscapes
- Control Of Turbines (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、タービン加減弁暖機制御方法に係り特に、蒸
気止弁に併設したバイパス弁の開閉により１作動流体の
一部を蒸気室に導入することにより暖機を行なうタービ
ンの、加減弁暖機方法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a turbine control valve warm-up control method, and particularly relates to a method for controlling the warm-up of a turbine control valve, and in particular, a method for directing a portion of one working fluid to a steam chamber by opening and closing a bypass valve attached to a steam stop valve. The present invention relates to a method for warming up a control valve for a turbine, which is warmed up by introducing a control valve.
従来は、特開昭６０−２５６５０号公報に記載のように
蒸気室の内壁と外壁メタル温度差が規定値以下をチェッ
クし、その後は温度差監視制御にて、温度差制限値を越
えない範囲で外壁メタル温度の上昇を図る方法がある。Conventionally, as described in Japanese Patent Application Laid-Open No. 60-25650, the temperature difference between the inner wall and outer wall metal of the steam room was checked to be below a specified value, and then temperature difference monitoring control was carried out to ensure that the temperature difference did not exceed the limit value. There is a method to increase the temperature of the outer wall metal.
発電プラントを例とした場合、タービン加減弁は、内厚
が厚いことから、起動過程における、蒸気室の内壁と外
壁のメタル温度に、温度差が生じる。この温度差が極端
で、しばしば繰り返されるとクリープひずみの集積によ
るき裂が生じることがあり、タービンの寿命に悪影響を
及ぼす為、このようなことをなくすように比較的長期間
停止した後の起動で、メ・タル温度が低い場合に、ター
ビン通気に先立って暖機が行なわれる。第４図は。Taking a power generation plant as an example, since the turbine control valve has a thick inner thickness, a temperature difference occurs between the metal temperatures of the inner wall and the outer wall of the steam chamber during the startup process. If this temperature difference is extreme and repeated often, cracks may occur due to the accumulation of creep strain, which will have a negative impact on the life of the turbine.To prevent this, startup after a relatively long period of shutdown is recommended. When the metal temperature is low, warm-up is performed prior to turbine ventilation. Figure 4 is.
暖機の対象としている箇所を示す断面図で、蒸気止弁か
ら蒸気加減弁を通してタービン段後に至る蒸気経路の概
念図である。ここで１は蒸気止弁、２は蒸気止弁バイパ
ス弁、３はケーシング、４は蒸気加減弁、５は蒸気加減
弁蒸気室であり、６゜７．８はそれぞれタービン初段動
翼、ダイヤフラム、ドレン弁である。暖機の対象として
いる箇所は、蒸気加減弁を含んだ蒸気加減弁蒸気室であ
る。It is a cross-sectional view showing a location to be warmed up, and is a conceptual diagram of a steam path from a steam stop valve to a downstream turbine stage through a steam control valve. Here, 1 is a steam stop valve, 2 is a steam stop valve bypass valve, 3 is a casing, 4 is a steam control valve, 5 is a steam control valve steam chamber, and 6° 7.8 are the turbine first stage rotor blade, diaphragm, It is a drain valve. The area targeted for warming up is the steam chamber containing the steam control valve.
（タービンケーシングにおいて、熱応力に対して最も危
険な部分は、加減弁及び初段ノズル付近の高温部とされ
ている。）従来、タービン加減弁の暖機方法としては、
蒸気室の外壁メタル温度が規定値以下ということから暖
撮要と判定し、第２図に示す要領で、蒸気加減弁蒸気室
の内壁と外壁のメタル温度差を常に監視し、温度差が予
め設定した値（制御値に多少の余裕を取すオーバシュー
トを考慮する。）を越えた場合、蒸気止弁バイパス弁を
全開するように制御し、又、逆に予め設定した値（バイ
パス弁を全開する温度差設定値に適度の動作すきまを持
たせる。）より下がった場合に、バイパス弁を全開（又
は、規定開度）にするようになるような制御方法が一般
に知られている。尚ここで２１は蒸気室内壁メタル温度
、２２は蒸気室外壁メタル温度、２３は蒸気止弁バイパ
ス弁開度、２４．２５はそれぞれ暖機開始、暖機完了条
件である。この従来技術の特徴は、バイパス弁の開、閉
を第２図に示したように時間軸方向に■及び■で示した
ように、二つの制御モードに区分し、区分Ｉは、一定の
パターン制御を区分■で、温度差監視制御（内壁と外壁
のメタル温度差を制限値内一杯に維持しつつ、暖機を行
なう、）としている点であるが、この方法は、次にのべ
るような大きな欠点をもつ。区分■においては、暖期初
期、蒸気室の内壁メタル温度が急激に上昇することを防
止するための考慮がなされているのに対し区分■では、
温度差制限値を越えない範囲で、どんどん外壁メタル温
度の上昇を図る為に、急激な温度゛変化による熱応力が
発生した場合の対応に問題があった。(In the turbine casing, the most dangerous parts for thermal stress are the high temperature parts near the regulator valve and the first stage nozzle.) Conventionally, the warm-up method for the turbine regulator valve is as follows:
Since the outer wall metal temperature of the steam room is below the specified value, it is determined that heating is required, and the steam control valve constantly monitors the metal temperature difference between the inner and outer walls of the steam room as shown in Figure 2, and the temperature difference is set in advance. If the value exceeds a preset value (taking into account overshoot that gives some margin to the control value), the steam stop valve is controlled to fully open the bypass valve, and conversely, the bypass valve is fully opened to A control method is generally known in which the bypass valve is fully opened (or to a specified opening degree) when the temperature difference setting value is set to have an appropriate operating clearance. Here, 21 is the steam chamber wall metal temperature, 22 is the steam chamber outer wall metal temperature, 23 is the steam stop valve bypass valve opening degree, and 24.25 is the warm-up start and warm-up completion conditions, respectively. The feature of this prior art is that the opening and closing of the bypass valve is divided into two control modes as indicated by ■ and ■ in the time axis direction as shown in FIG. The control is categorized as temperature difference monitoring control (warming is performed while maintaining the metal temperature difference between the inner and outer walls within the limit value), but this method is based on the following method. has major drawbacks. In category ■, consideration is given to preventing the temperature of the inner wall metal of the steam room from rising rapidly during the early warm season, whereas in category ■,
In order to increase the temperature of the outer wall metal without exceeding the temperature difference limit, there was a problem in dealing with the occurrence of thermal stress due to sudden temperature changes.
本発明の目的は、暖機時間に従来と同程度で、尚かつ温
度変化率を監視することにより熱応力への考慮しつつ暖
機可能とすることにある。An object of the present invention is to enable warm-up while taking the same amount of warm-up time as conventional methods and taking thermal stress into consideration by monitoring the rate of temperature change.
上記目的は、従来の暖機方法に温度変化率監視制御を加
えることにより、温度変化率が大きくなった時点で、蒸
気止弁バイパス弁が全開方向であった場合には、その位
置開度に保持する制御を行ない温度変化を抑えるように
、蒸気止弁バイパス弁制御を行なうことにより、達成さ
れる。The above purpose is to add temperature change rate monitoring control to the conventional warm-up method, so that when the temperature change rate becomes large, if the steam stop valve bypass valve is in the fully open direction, the position This is achieved by controlling the steam stop valve and bypass valve to maintain the temperature and suppress temperature changes.
従来、タービン加減弁の暖機方法としては、蒸気室の外
壁メタル温度が規定値以下ということで温度監視制御の
みを用いて蒸気止弁バイパス弁の開閉に行なうものであ
る。Conventionally, a method for warming up a turbine control valve is to open and close a steam stop valve bypass valve using only temperature monitoring control when the temperature of the outer wall metal of the steam chamber is below a specified value.
この場合、温度変化率を監視していない為に急激な温度
変化により発生した熱応力によって、加減弁、初段ノズ
ル付近の高温部に影響をあたえる。In this case, since the rate of temperature change is not monitored, the thermal stress generated by the sudden temperature change affects the high temperature parts near the control valve and the first stage nozzle.
そこでこれまでの温度監視制御に温度変化率監視制御を
加えもつ、タービン加減弁の暖機方法を用いることによ
り、暖機中に発生する熱応力による問題を解決する。Therefore, by using a method for warming up the turbine control valve that adds temperature change rate monitoring control to the conventional temperature monitoring control, the problem caused by thermal stress that occurs during warm-up is solved.
以下１本発明を実施例に基づいて説明する。 The present invention will be explained below based on examples.
第３図、第１図に本発明の一実施例を示す。An embodiment of the present invention is shown in FIG. 3 and FIG. 1.
第３図は、暖機における蒸気止弁バイパス弁の操作方法
を、蒸気室の内壁及び外壁メタル温度に対応させて示し
たものであり、第１図は、第３図の蒸気止弁バイパス弁
の操作方法を、フローチャートに変換して示したもので
ある。Figure 3 shows how to operate the steam stop valve bypass valve during warm-up in response to the temperature of the inner wall and outer wall metal of the steam chamber, and Figure 1 shows the operation method of the steam stop valve bypass valve in Figure 3. The operating method is converted into a flowchart.
第３図に示されたように、蒸気止弁バイパス弁による暖
機を、弁の開閉によるという点は、従来技術と基本的に
同じであるが、本発明では時間軸に二つの制御モードと
し区分■は従来と同じ一定のパターン制御であるが、区
分■で従来の温度差監視制御に温度変化率監視制御を加
えた制御としている。As shown in FIG. 3, the warm-up by the steam stop valve bypass valve is basically the same as the conventional technology in that the valve is opened and closed, but in the present invention, there are two control modes on the time axis. Category ■ is the same constant pattern control as the conventional one, but category ■ is control that adds temperature change rate monitoring control to the conventional temperature difference monitoring control.
以下順を追って説明する。A step-by-step explanation will be given below.
２４は暖機開始条件であり１通常、「蒸気室外壁メタル
温度が規定値以下（暖機要の判定条件）」の他に、「蒸
気条件が成立している。」 ［加減弁が全閉している。24 is the warm-up start condition.1 Normally, in addition to "the steam room outer wall metal temperature is below the specified value (warm-up required judgment condition)", "steam conditions are met" [the control valve is fully closed] are doing.
」、「ドレン弁が規定開度になっている。」等の条件と
の複合条件で構成される。” and “The drain valve is at the specified opening.”
暖機開始条件が成立すると、まず、弁をＴｏ時間だけ開
き、その後、全閉し、Ｔｃ時間後に再度開くといった、
区分Ｉのパターン制御を実行する。When the warm-up start conditions are met, the valve is first opened for a time To, then fully closed, and reopened after a time Tc.
Execute pattern control for section I.
この制御モード採用の意図は、暖機初期、蒸気室の内壁
メタル温度が急激に上昇することを防止するためである
。The purpose of adopting this control mode is to prevent the temperature of the inner wall metal of the steam chamber from rising rapidly during the initial stage of warm-up.
Ｔｃ時間後に再度弁を開いたらＴｏａ時間後に（これは
別に設置しなくともよいが、一定安定のため入れたもの
。）、内壁と外壁のメタル温度差が規定値以下（制限値
に対し、オーバーシュートを考えて多少の余裕を取った
値：ΔＴｌ）をチェックすると同時に温度変化率監視制
御を開始し区分■で温度差監視制御を加え行なう。When the valve is opened again after the Tc time, after the Toa time (this does not need to be installed separately, but is included for constant stability), the metal temperature difference between the inner and outer walls is below the specified value (over the limit value). At the same time as checking the value (ΔTl) with some margin in consideration of the shoot, temperature change rate monitoring control is started, and temperature difference monitoring control is added in category (2).
区分■においては、温度差制限値を越えない範囲で、ど
んどん外壁メタル温度の上昇を図る為。In category ■, the purpose is to gradually increase the temperature of the outer wall metal within a range that does not exceed the temperature difference limit value.
温度差がΔＴ１になったら、弁を全閉し温度差が減少す
るのを併つ適当な動作すきまを設定しくΔＴ１−ΔＴ２
）温度差がΔＴ２以下になったら、再度弁を開き、外壁
メタル温度の上昇を図るが、温度変化率（ΔＴ３）が大
きくなったらその時点で蒸気止弁バイパス弁開度をその
位置開度に保持し温度変化率を抑える。When the temperature difference reaches ΔT1, fully close the valve and set an appropriate operating clearance to reduce the temperature difference.ΔT1-ΔT2
) When the temperature difference becomes ΔT2 or less, open the valve again and try to raise the outer wall metal temperature, but if the temperature change rate (ΔT3) becomes large, at that point the steam stop valve bypass valve opening should be changed to that position. hold and suppress the rate of temperature change.
これを繰り返し行ない、蒸気室の外壁メタル温度が規定
値以上になったら暖機を終了する。２５は、その暖機終
了条件である。尚、図中３１゜３２．３３はそれぞれ蒸
気室内壁メタル温度、蒸気室外壁メタル温・度、蒸気止
弁バイパス弁開度である。This is repeated until the temperature of the outer wall metal of the steam room reaches a specified value or higher, and the warm-up is finished. 25 is the warm-up end condition. In the figure, 31°, 32, and 33 are the steam chamber inner wall metal temperature, the steam chamber outer wall metal temperature/degree, and the opening degree of the steam stop valve bypass valve, respectively.
第１図は、これらの動きをフローチャートで示している
。FIG. 1 shows these movements in a flowchart.
４１は、暖機要否の判定回路であり、「外壁メタル温度
規定値以下か？（以下でＹＥＳ）Ｊである。規定値以下
であれば、４２で弁を開き、Ｔ。Reference numeral 41 is a circuit for determining whether or not warm-up is necessary, and the answer is ``Is the temperature of the outer wall metal below the specified value? (YES below) J. If it is below the specified value, the valve is opened at 42 and T is selected.
時間保持後４３で弁を閉じ、Ｔｃ待時間保持後４温度変
化率が小さければ弁開とパターン制御にて行なうがこの
場合温度変化率が大きければ弁開度をその位置保持にて
温度変化率を抑える制御を行ない、Ｔｏａ時間後に、４
５で内壁と外壁のメタル温度差をチェックしく「温度差
規定値以上か？（以上でＹＥＳ）Ｊ ：ＤＴｌ）温度
差監視制御に移行させる。After holding the time, the valve is closed at 43, and after holding the Tc waiting time at 4. If the temperature change rate is small, the valve is opened and pattern control is performed.In this case, if the temperature change rate is large, the valve opening is held at that position and the temperature change rate is After Toa time, 4
Check the metal temperature difference between the inner wall and outer wall in step 5.Is the temperature difference greater than the specified value? (YES if above)J:DTl) Move to temperature difference monitoring control.
４６は、「温度差規定値以下か？（以下でＹＥＳ ）：
ＤＴ２Ｊの判定回路であり、４７は弁開、４８は弁閉
、４９は暖機終了の判定回路であり（「外壁メタル温度
規定値以上か？（以上でＹＥＳ）Ｊ、４９で終了が判定
されるまで、４５〜４８までが繰り返し実行される。46 is “Is the temperature difference below the specified value? (YES below):
This is a judgment circuit for DT2J, 47 is a valve open, 48 is a valve closed, and 49 is a judgment circuit for completion of warm-up. Steps 45 to 48 are repeated until the
尚、終了判定のメタル温度と暖機要否判定のメタル温度
は、同じ蒸気室の外壁メタル温度であるが、通常は、終
了判定メタル温度を暖機要否判定メタル温度に対し士数
度高くシ、暖機完了後、タービン通気までの間に温度が
降下してもよいように、その分捕なうようにしている。Note that the metal temperature for determining termination and the metal temperature for determining whether or not warm-up is necessary are the same outer wall metal temperature of the steam room, but normally the metal temperature for determining termination is a few degrees higher than the metal temperature for determining whether warm-up is necessary. After warm-up is completed, the temperature is taken care of so that it may drop until the turbine is vented.
本発明によれば、従来の暖機方法に温度変化率監視制御
を加え、暖機を行なうので、暖機中に急激な温度変化が
発生した場合においても、暖機を行なうことができるの
で、暖機時間は、はぼ同じ所要時間で暖機出来る。しか
し起動喪失については、これまでの暖機方法に比べて大
きな効果がある。According to the present invention, since warm-up is performed by adding temperature change rate monitoring control to the conventional warm-up method, warm-up can be performed even if a sudden temperature change occurs during warm-up. It takes about the same amount of time to warm up. However, in terms of startup loss, this method has a greater effect than conventional warm-up methods.
第１図は１本発明の一実施例の操作を示すフローシート
、第２図は従来の暖機制御方法の説明図、第３図は本発
明の暖機制御方法の説明図、第４図荊２区
高３図Fig. 1 is a flow sheet showing the operation of one embodiment of the present invention, Fig. 2 is an explanatory diagram of the conventional warm-up control method, Fig. 3 is an explanatory diagram of the warm-up control method of the present invention, and Fig. 4 Jing 2nd District
High school 3rd figure
Claims (1)
気加減弁をシリーズに設置し、前記蒸気止弁から前記蒸
気加減弁までの蒸気室の暖機を、前記蒸気止弁に併設し
たバイパス弁の開閉により行なうタービンにおいて、前
記蒸気止弁の前記バイパス弁の開閉制御を、前記蒸気室
の内壁と外壁のメタル温度差による方法に温度変化率の
監視制御を加え急激な温度変化による熱応力に対応でき
ることを特徴とするタービン加減弁暖機制御方法。1. A steam stop valve that shuts off the working fluid and a steam control valve that controls the flow rate are installed in series, and a warm-up of the steam chamber from the steam stop valve to the steam control valve is attached to the steam stop valve. In a turbine that operates by opening and closing a bypass valve, the opening and closing control of the bypass valve of the steam stop valve is performed using a method based on the metal temperature difference between the inner and outer walls of the steam chamber, and monitoring control of the rate of temperature change is added to control the opening and closing of the bypass valve due to sudden temperature changes. A turbine control valve warm-up control method characterized by being able to respond to stress.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6092787A JPS63227909A (en) | 1987-03-18 | 1987-03-18 | Method for turbine governor valve warming up control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6092787A JPS63227909A (en) | 1987-03-18 | 1987-03-18 | Method for turbine governor valve warming up control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63227909A true JPS63227909A (en) | 1988-09-22 |
Family
ID=13156509
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6092787A Pending JPS63227909A (en) | 1987-03-18 | 1987-03-18 | Method for turbine governor valve warming up control |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63227909A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114545997A (en) * | 2022-03-15 | 2022-05-27 | 山东京博石油化工有限公司 | Constant temperature control method and device for polyolefin kettle type reaction |
-
1987
- 1987-03-18 JP JP6092787A patent/JPS63227909A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114545997A (en) * | 2022-03-15 | 2022-05-27 | 山东京博石油化工有限公司 | Constant temperature control method and device for polyolefin kettle type reaction |
| CN114545997B (en) * | 2022-03-15 | 2023-09-19 | 山东京博石油化工有限公司 | Polyolefin kettle type reaction constant temperature control method and device |
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