JPS60164606A - Piping warming up control device - Google Patents
Piping warming up control deviceInfo
- Publication number
- JPS60164606A JPS60164606A JP1970084A JP1970084A JPS60164606A JP S60164606 A JPS60164606 A JP S60164606A JP 1970084 A JP1970084 A JP 1970084A JP 1970084 A JP1970084 A JP 1970084A JP S60164606 A JPS60164606 A JP S60164606A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- steam
- piping
- valve
- metal
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D15/00—Component parts of recorders for measuring arrangements not specially adapted for a specific variable
- G01D15/16—Recording elements transferring recording material, e.g. ink, to the recording surface
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G3/00—Steam superheaters characterised by constructional features; Details of component parts thereof
- F22G3/008—Protection of superheater elements, e.g. cooling superheater tubes during starting-up periods, water tube screens
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
- Structure Of Emergency Protection For Nuclear Reactors (AREA)
- Control Of Turbines (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は蒸気配管暖機制御装置に係り、特にボイラ主蒸
気配管等の肉厚配管を起動操作する際に、無理な熱応力
等を加えることなく暖機するための暖機制御装置に関す
る。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a steam piping warm-up control device, and particularly to a steam piping warm-up control device that prevents the application of excessive thermal stress, etc., when starting up thick-walled piping such as boiler main steam piping. The present invention relates to a warm-up control device for warming up without any problem.
ｒｇ：ａ８の沓暑）
従来の火力発電所は連続運転をするのが普通であったか
ら、起動操作に充分な時間をかけ、機械に無理な熱応力
等を加えることがないように運転制御していた。RG: A8's Kutsuka) Conventional thermal power plants normally operated continuously, so they took sufficient time for startup operations and controlled operations to avoid applying undue thermal stress to the machinery. was.
ところが、原子力発電がペース需要電力を給゛亀し、火
力発電が需要変動分を供給するようになってからは、火
力発電機は毎日起動停止を繰返すことＫなり、しかもき
め細かい対応のために短時間で頻繁な起動停止が要求さ
れることとなった。そこで、タービンバイパス系統を設
けてボイラを先行起動しておき、圧力等が充分になった
状態でタービンに通気起動するプラントが増えてきてい
る。However, since nuclear power generation has begun to supply the pace of power demand, and thermal power generation has begun to supply demand fluctuations, thermal power generators have to be started and stopped repeatedly every day, and moreover, in order to respond to detailed responses, short-term This resulted in frequent startup and shutdown requests over time. Therefore, an increasing number of plants are installing a turbine bypass system to start up the boiler in advance, and start the turbine by ventilating it when the pressure etc. are sufficient.
この種プラントにおいてボイラからタービンに蒸気を導
く主蒸気管は肉厚である。この冷たい配管に急激に熱い
蒸気を通した場合、過大な熱応力が加わり、配管割れを
生ずる恐れがある。In this type of plant, the main steam pipe that guides steam from the boiler to the turbine is thick. If hot steam is suddenly passed through this cold pipe, excessive thermal stress will be applied, which may cause the pipe to crack.
この危険を避けるために、タービンバイパス付の発電所
において、主蒸気管の熱応力を監視しながら徐々に暖機
する制御装置が提案されている。In order to avoid this danger, a control device has been proposed for a power plant with a turbine bypass that gradually warms up the main steam pipe while monitoring thermal stress.
との赫＃行中蕊頷笹卦よｒド耳執茶ダ筈の台儒所の内外
壁に温度計を取付け、各部の熱応力が過大にならないよ
うに蒸気供給弁および配管ドレン弁を操作する制御装置
である。この制御装＃により暖機する場合、暖機初期の
飽和領域を熱応力に対する制御のみで操作すると、配管
ドレン弁を閉じたときに熱応力が一時的に増大する不具
合がある。Thermometers were installed on the inner and outer walls of the temple where the temple was supposed to be open, and the steam supply valve and piping drain valve were operated to prevent excessive thermal stress in each part. It is a control device that When warming up using this control system, if the saturated region at the initial stage of warming up is operated only by controlling thermal stress, there is a problem in that thermal stress temporarily increases when the piping drain valve is closed.
これは飽和領域において配管ドレン弁を閉じると、配管
内の蒸気圧力が高まり蒸気の飽和温度も上昇し、ドレン
化する温度も上がることにより配管が急速に加熱される
のが原因である。This is because when the pipe drain valve is closed in the saturated region, the steam pressure within the pipe increases, the saturation temperature of the steam also rises, and the temperature at which it turns into drain also rises, causing the pipe to heat up rapidly.
本発明の目的は、熱応力を規定値以内に抑えながら暖機
初期の飽和領域を通過させ、通常のドレン弁制御が可能
な過熱領域に主蒸気管を迅速に到らしめる配管暖機制御
装置を提供することである。An object of the present invention is to provide a piping warm-up control device that allows the main steam pipe to pass through the saturated region at the initial stage of warm-up while suppressing thermal stress within a specified value, and quickly brings the main steam pipe to the superheat region where normal drain valve control is possible. The goal is to provide the following.
本発明は、冷たい配管に熱い蒸気を通す場合、配管メタ
ル温度が低いほど大きな温度差の蒸気を通気するように
条件付けると共に、初期開度と保持時間とをこの温度差
の関数として設定し、熱応力を規定値以下に保ちながら
短時間で過熱領域に入らせるようにしたことを特徴とす
る。When passing hot steam through cold pipes, the present invention provides conditions such that the lower the pipe metal temperature is, the greater the temperature difference between the steam is vented, and the initial opening degree and holding time are set as a function of this temperature difference. It is characterized by being able to enter the overheating region in a short time while keeping the thermal stress below a specified value.
第１図は、火力発電プラン）において本発明に関係する
部分の系統を示す概略図である。FIG. 1 is a schematic diagram showing a system of parts related to the present invention in a thermal power generation plan.
ボイラ１の過熱器２で過熱された蒸気は、タービン４を
起動する前は、高圧タービンバイパス弁５を通してボイ
ラに戻され、ボイラ再熱器３で再熱後、低圧タービンバ
イパス弁９を通り、図示しない復水器に回収でれる。ボ
イラ出口からタービンに蒸気を導く主蒸気管１３の入口
には、ボイラ出口止弁６および出口止弁バイパス弁７が
設けられている。これらの弁は、周知の如く、タービン
側の切離しや主蒸気管の冷却防止のために用いられる。Before starting the turbine 4, the steam superheated in the superheater 2 of the boiler 1 is returned to the boiler through the high-pressure turbine bypass valve 5, and after being reheated in the boiler reheater 3, it passes through the low-pressure turbine bypass valve 9. It is collected in a condenser (not shown). A boiler outlet stop valve 6 and an outlet stop valve bypass valve 7 are provided at the inlet of the main steam pipe 13 that guides steam from the boiler outlet to the turbine. As is well known, these valves are used to disconnect the turbine side and prevent cooling of the main steam pipe.
また、ボイラ出口止弁バイパス弁７は、主蒸気管の暖機
時等のように、少量の蒸気を主蒸気管１３に供給するの
に使用される。主蒸気管１３のタービン入口近くには、
主蒸気管ドレン弁８があり、主蒸気管１３の暖機蒸気や
ドレンの排出に使われる。ｌＯけボイラ出口蒸気温度計
、１１はタービン入口主蒸気管メタル内壁温度針であり
、それらの計測値は本発明対象である配管暖機制御装置
１２に取込まれる。Further, the boiler outlet stop valve bypass valve 7 is used to supply a small amount of steam to the main steam pipe 13, such as when warming up the main steam pipe. Near the turbine inlet of the main steam pipe 13,
There is a main steam pipe drain valve 8, which is used to discharge warm-up steam and drain from the main steam pipe 13. 11 is a turbine inlet main steam pipe metal inner wall temperature needle, and the measured values are taken into the piping warm-up control device 12, which is the object of the present invention.
第２図は本発明による配管暖機制御装置の概略構成を示
すブロック図である。図において第１図と同一符号は同
等の部分を表わしている。FIG. 2 is a block diagram showing a schematic configuration of a pipe warm-up control device according to the present invention. In the figure, the same reference numerals as in FIG. 1 represent the same parts.
ボイラ出口蒸気温度計１０とタービン入口主蒸気管内壁
メタル温度計１１からの計測値は、配管暖機制御装置１
２０入出力インターフエイスｌ１０１７を介してランダ
ムアクセスメモリＲＡＭ１９に送られ記憶される。中央
処理装置ＣＰＵ１８は、このデータを用い、リードオン
リーメモリＲＯＭ２０に予め記憶されたプログラムに基
づき、６弁の開度と時間とを劃−するようになっている
。Measured values from the boiler outlet steam thermometer 10 and the turbine inlet main steam pipe inner wall metal thermometer 11 are measured by the pipe warm-up control device 1.
20 input/output interface l1017 to the random access memory RAM19 for storage. The central processing unit CPU 18 uses this data to control the opening degrees and times of the six valves based on a program stored in advance in the read-only memory ROM 20.
７１．８１は開度制御装置である。71.81 is an opening control device.
本発明はボイラ出口止弁バイパス弁７を主蒸気管暖機に
使用する際のこの弁の制御に関するものである。The present invention relates to the control of the boiler outlet stop valve bypass valve 7 when this valve is used for warming up the main steam pipe.
ボイラ出口止弁バイパス弁７を開いて主蒸気管管メタル
温度Ｔｗに対して第３図のように条件付ける。The boiler outlet stop valve bypass valve 7 is opened and the main steam pipe metal temperature Tw is conditioned as shown in FIG.
すなわち、メタル温度Ｔｗが低−ときは、ボイラ出口の
蒸気温度Ｔ■をメタル温度Ｔ賛よりも大幅に高く設定す
るようにしたものである。第３図において点線は、両者
の温度が等しい場合を表わしており、実線が本発明の設
定条件を示している。That is, when the metal temperature Tw is low, the steam temperature T2 at the boiler outlet is set much higher than the metal temperature T. In FIG. 3, the dotted line represents the case where both temperatures are equal, and the solid line represents the setting conditions of the present invention.
このようにメタル温度ＴＭが低い穆温度差ΔＴを大きく
するのは、主蒸気管が冷えている場合、飽和温度まで上
昇するのに大きな熱量を奪い、蒸気温度が低下するため
である。The reason why the metal temperature difference ΔT is increased when the metal temperature TM is low is that when the main steam pipe is cold, a large amount of heat is taken to raise the temperature to the saturation temperature, and the steam temperature decreases.
なお、通気条件として、上記の他に、ボイラ出口温度が
上昇方向にある等の事項が付加される場合もある。Note that, in addition to the above-mentioned ventilation conditions, matters such as the boiler outlet temperature being in an increasing direction may be added.
次に主蒸気管に蒸気を流す時の初期開度は、ボイラ出口
止弁バイパス弁７を開く直前のボイラ出口蒸気温度Ｔｍ
と主蒸気管メタル温度ＴＭとの差ΔＴをパラメータとし
て第４図のように決定する。Next, the initial opening degree when steam flows through the main steam pipe is the boiler outlet steam temperature Tm immediately before opening the boiler outlet stop valve bypass valve 7.
The difference ΔT between the main steam pipe metal temperature TM and the main steam pipe metal temperature TM is determined as a parameter as shown in FIG.
この温度差ΔＴが大きいときには、通気時の熱応−ｈ４
庄番請【＋さ暑へ番括Ｉ 釦器朋廖へ九、１、身１姑と
する。初期開度０は、ボイラ出口止弁バイパス弁７と主
蒸気管ドレン弁８について決定する。When this temperature difference ΔT is large, the thermal response during ventilation -h4
Shobanke [+Sasatsu to Banshu I] Buttonki Tomokyo to 9, 1, and 1 mother-in-law. The initial opening degree 0 is determined for the boiler outlet stop valve bypass valve 7 and the main steam pipe drain valve 8.
冷たい主蒸気管に熱い蒸気を通気すると、冷たいメタル
に触れた蒸気はドレン化し、内部蒸気は飽和蒸気温度ま
で冷却される。この時ドレンからメタルへの熱伝達が大
きく、メタルはこの飽和温度まで急速に加熱され、熱応
力も急速に生ずる。When hot steam is vented into the cold main steam pipe, the steam that comes into contact with the cold metal turns into condensate, and the internal steam is cooled to the saturated steam temperature. At this time, heat transfer from the drain to the metal is large, the metal is rapidly heated to this saturation temperature, and thermal stress is also rapidly generated.
この飽和領域では、ドレン弁の開閉操作による熱応力の
増減方向が過熱領域とは逆になるため、制御が困難であ
る。そこでこの領域では、弁開度を一定にしたまま一定
時間保持し、飽和領域から過熱領域に移行するのを待つ
。この保持時間も温度差ΔＴをパラメータとして決定す
る。温度差ΔＴが大きい場合は長時間保持し、メタル温
度ＴＭが蒸気温度Ｔｓに近づくのを待つ。この関係を第
５図に示す。In this saturated region, the direction of increase/decrease in thermal stress due to the opening/closing operation of the drain valve is opposite to that in the overheating region, and therefore control is difficult. Therefore, in this region, the valve opening degree is kept constant for a certain period of time and waits for the transition from the saturated region to the superheat region. This holding time is also determined using the temperature difference ΔT as a parameter. If the temperature difference ΔT is large, it is held for a long time and waits until the metal temperature TM approaches the steam temperature Ts. This relationship is shown in FIG.
これらの操作を行なった後、通常の配管熱応力によるド
レン弁開度制御に入れば、制御開始時にドレン弁を全閉
又は全開まで至らせる異常操作をすることがなくなシ、
種々の起動条件から過大な熱応力を生ずることなく飽和
蒸気領域を迅速に通過できる。After performing these operations, if you enter drain valve opening control using normal piping thermal stress, you will not have to perform abnormal operations that cause the drain valve to fully close or fully open at the start of control.
It can quickly pass through the saturated steam region without generating excessive thermal stress from various start-up conditions.
次に、ボイラ出口止弁バイパス弁７の弁開度制御につい
て第６図のフローチャートにより述べる。Next, the valve opening control of the boiler outlet stop valve bypass valve 7 will be described with reference to the flowchart of FIG.
ボイラ１から主蒸気管１３を通り蒸気タービン４に行く
べき蒸気は当初、ボイラ出口止弁６およびボイラ出口止
弁バイパス弁７により遮断されている。Steam that is to go from the boiler 1 to the steam turbine 4 through the main steam pipe 13 is initially blocked by the boiler outlet stop valve 6 and the boiler outlet stop valve bypass valve 7.
この状、−心でＩｔｉｌｌｌｌｌｌｌを開始し、まず第
１ステツプでボイラ出口温度計１０とタービン入口主蒸
気配管内壁温度計１１との計測値を１１０１７を介して
ＲＡＭｔ９に読み込む。In this state, Itillllllll is started with the -center, and in the first step, the measured values of the boiler outlet thermometer 10 and the turbine inlet main steam pipe inner wall thermometer 11 are read into the RAMt9 via 11017.
第２ステツプで両温度計の温度差ΔＴをめる。In the second step, the temperature difference ΔT between both thermometers is calculated.
その結果第３図上のどの位置かがめられる。As a result, the position on FIG. 3 can be determined.
第３ステツプでは温度差ΔＴに基づいて、第４図で示し
た関数に従い、ボイラ出口止弁バイパス弁７の初期量度
目標値を設定する。In the third step, an initial flow target value for the boiler outlet stop valve bypass valve 7 is set based on the temperature difference ΔT and according to the function shown in FIG.
第４ステツプでは前述の温度差ΔＴに基づめで弁を開い
ておく初期時間を第５図の如く設定する。In the fourth step, the initial time for opening the valve is set as shown in FIG. 5 based on the temperature difference ΔT mentioned above.
第５ステツプでは得られた弁開塵と時間に従いボイラ出
口止弁バイパス弁７の制御を行なう。In the fifth step, the boiler outlet stop valve bypass valve 7 is controlled according to the obtained valve opening and time.
予定時間経過後に上記ステップを繰り返していけば、過
大な熱応力を加えることなく、細かい制御ができるので
、迅速に飽和領域を通過させ、過熱領域に入らせること
が可能である。By repeating the above steps after the scheduled time has elapsed, fine control can be achieved without applying excessive thermal stress, so it is possible to quickly pass through the saturated region and enter the overheating region.
本発明によれば、熱応力を規定値以内に抑えながら暖機
初期の飽和領域を通過させ、通常のドレン弁制御が可能
な過熱領域に主蒸気管を迅速に到らしめる配管暖機制御
装置が得られる。According to the present invention, the piping warm-up control device allows the main steam pipe to pass through the saturated region at the initial stage of warm-up while suppressing thermal stress within a specified value, and quickly brings the main steam pipe to the superheat region where normal drain valve control is possible. is obtained.
第１図は本発明を適用する火力発電プラントの系統を示
す概略図、第２図は本発明の配管暖機制御装置の概略構
成を示すブロック図、第３図は主蒸気管暖機開始温度条
件を決めるための特性面ｔ−めるための特性面を第６図
はフローチャートである。
１・・・ボイラ、２・・・過熱器、３・・・再熱器、４
・・・蒸気タービン、５・・・高圧タービンバイ・（ス
弁、６・・・ボイラ出口止弁、７・・・ボイラ出口止弁
バイノくス弁、８・・・主蒸気管ドレン弁、９・・・低
圧タービンバイパス弁、１０・・・ボイラ出口蒸気温度
計、１１・・・タービン入口主蒸気管メタル内壁温度計
、１２・・・配管暖機制御装置、１３・・・主蒸気管、
１７・・・入出力インターフェイスＩ１０．１８・・・
中央処理装置ＣＰＵ。
１９・・・ランダムアクセスメモリＲＡＭ、２０・・・
リードオンリーメモリＲＯＭ、７１．８１・・・開度制
御装置。
代理人 弁理士 鵜沼辰之
光３図
率４図
光５図
ムｌ−ｌｓ−１’Ｍ温Ａを
皐６ＦFig. 1 is a schematic diagram showing a system of a thermal power plant to which the present invention is applied, Fig. 2 is a block diagram showing a schematic configuration of a pipe warm-up control device of the present invention, and Fig. 3 is a main steam pipe warm-up start temperature. FIG. 6 is a flowchart showing the characteristic aspects for determining the conditions. 1... Boiler, 2... Superheater, 3... Reheater, 4
...Steam turbine, 5...High pressure turbine bypass valve, 6...Boiler outlet stop valve, 7...Boiler outlet stop valve binox valve, 8...Main steam pipe drain valve, 9...Low pressure turbine bypass valve, 10...Boiler outlet steam thermometer, 11...Turbine inlet main steam pipe metal inner wall thermometer, 12...Piping warm-up control device, 13...Main steam pipe ,
17... Input/output interface I10.18...
Central processing unit CPU. 19...Random access memory RAM, 20...
Read-only memory ROM, 71.81... Opening control device. Agent Patent Attorney Tatsuyuki Unuma 3 figures 4 figures light 5 figures 1-ls-1'M 6F
Claims (1)
弁を有しボイラ出口蒸気温度計とタービン入口主蒸気管
メタル内壁温度針を備えた火力発電プラントの主蒸気配
管を前記ふたつの温度計の計測値に基づき前記バイパス
弁の開度を調節することによｐ暖機させる配管暖機制御
装置において、内壁温度が低い程温度差の大きい蒸気を
送り、温度差が大きい種弁開度を小さくシ、温度差が大
きい程長い時間をかけるように初期条件を設定する手段
を備えたことを特徴とする配管暖機制御装置。1. The main steam piping of a thermal power plant is equipped with a boiler outlet stop valve bypass valve on the steam inflow side of the main steam piping, and a boiler outlet steam thermometer and a turbine inlet main steam pipe metal inner wall temperature needle. In the piping warm-up control device that warms up the temperature by adjusting the opening degree of the bypass valve based on the measured value of A piping warm-up control device characterized by having means for setting initial conditions such that the smaller the temperature difference is, the longer the time is taken.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1970084A JPS60164606A (en) | 1984-02-06 | 1984-02-06 | Piping warming up control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1970084A JPS60164606A (en) | 1984-02-06 | 1984-02-06 | Piping warming up control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60164606A true JPS60164606A (en) | 1985-08-27 |
| JPH0350881B2 JPH0350881B2 (en) | 1991-08-05 |
Family
ID=12006539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1970084A Granted JPS60164606A (en) | 1984-02-06 | 1984-02-06 | Piping warming up control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60164606A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010216477A (en) * | 2009-03-17 | 2010-09-30 | General Electric Co <Ge> | System and method for prewarming heat recovery steam generator and associated steam line |
| JP2017522483A (en) * | 2014-06-04 | 2017-08-10 | シーメンス アクティエンゲゼルシャフト | Method for warming up or keeping warm of steam turbine |
-
1984
- 1984-02-06 JP JP1970084A patent/JPS60164606A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010216477A (en) * | 2009-03-17 | 2010-09-30 | General Electric Co <Ge> | System and method for prewarming heat recovery steam generator and associated steam line |
| JP2017522483A (en) * | 2014-06-04 | 2017-08-10 | シーメンス アクティエンゲゼルシャフト | Method for warming up or keeping warm of steam turbine |
| US10100665B2 (en) | 2014-06-04 | 2018-10-16 | Siemens Aktiengesellschaft | Method for heating up a steam turbine or for keeping a steam turbine hot |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0350881B2 (en) | 1991-08-05 |
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