JPH05125907A - Heat insulation device for branch pipe - Google Patents
Heat insulation device for branch pipeInfo
- Publication number
- JPH05125907A JPH05125907A JP3285159A JP28515991A JPH05125907A JP H05125907 A JPH05125907 A JP H05125907A JP 3285159 A JP3285159 A JP 3285159A JP 28515991 A JP28515991 A JP 28515991A JP H05125907 A JPH05125907 A JP H05125907A
- Authority
- JP
- Japan
- Prior art keywords
- steam
- pipe
- drain
- branch
- branch pipe
- 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
Landscapes
- Pipeline Systems (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、たとえば蒸気タービン
プラントに代表される蒸気動力プラントに係り、特にそ
のプラントに組込まれた機器同士を結ぶ主経路を構成す
る配管から分岐している分岐管内に滞留するドレンによ
って高温の主経路側配管が急冷されるときの熱衝撃を緩
和するのに好適な分岐管保温装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam power plant represented by, for example, a steam turbine plant, and more particularly to a branch pipe branched from a pipe forming a main path connecting equipments incorporated in the plant. The present invention relates to a branch pipe heat retention device suitable for alleviating thermal shock when the high temperature main path side pipe is rapidly cooled by accumulated drain.
【０００２】[0002]
【従来の技術】分岐管内のドレンがプラント系内圧力の
変動時に自己蒸発、いわゆるフラッシングを生じて、主
経路側配管（以下、蒸気母管と称する）に逆流し、高温
の蒸気母管が急冷されて熱衝撃をもたらすことはよく知
られている。この熱衝撃は使用材料に常に苛酷な状況を
強いることになり、ときに材料の疲労を一気に高進させ
る。これを緩和する試みは様々な方法により提案されて
いる。2. Description of the Related Art The drain in a branch pipe causes self-evaporation or so-called flushing when the pressure in the plant system fluctuates, and flows back to the main path side pipe (hereinafter referred to as the steam mother pipe) to rapidly cool the high temperature steam mother pipe. It is well known that thermal shock is caused. This thermal shock always imposes severe conditions on the material used, and sometimes accelerates the fatigue of the material at once. Attempts to mitigate this have been proposed by various methods.
【０００３】たとえば、図７に示す方法は水平の蒸気母
管１から下方に分岐しているドレン管２の垂直延長部Ｈ
をある長さ以上設け、この部分については保温材料３を
厚く施工し、一方これ以外の水平部は少量の保温材料４
かあるいは全く施工しないことにより、ドレン弁５が閉
まった後に発生するドレンのフラッシングの発生範囲を
垂直延長部Ｈに制限しようとするものである（特公昭６
０−５８４３号公報参照）。For example, in the method shown in FIG. 7, a vertical extension H of a drain pipe 2 branching downward from a horizontal steam mother pipe 1.
Is provided for a certain length or more, and the heat insulating material 3 is thickly applied to this portion, while a small amount of the heat insulating material 4 is applied to other horizontal portions.
Alternatively, by not installing the drain valve 5 at all, the generation range of the flushing of the drain after the drain valve 5 is closed is limited to the vertical extension H (Japanese Patent Publication 6).
0-5843).
【０００４】また、図８に示すやり方は蒸気母管１から
下方に分岐させたドレン管２の一部に放熱フィン６を設
け、ドレン弁（図示せず）が閉まった後に発生したドレ
ンの保有している熱を放熱フィン６を通して外に逃が
し、ドレンのフラッシングを少量に抑え込もうとするも
のである。Further, in the method shown in FIG. 8, a radiation fin 6 is provided in a part of the drain pipe 2 branched downward from the steam mother pipe 1 to retain the drain generated after the drain valve (not shown) is closed. The generated heat is released to the outside through the heat radiation fins 6 so that the flushing of the drain is suppressed to a small amount.
【０００５】以上の２つの方法はいずれもドレン管２内
で生じたあるまとまった量のドレンが一定時間を経た後
に冷却し、その場に滞留することを踏まえてこの問題へ
の解決を与えようとするものである。Both of the above two methods will solve the problem based on the fact that a certain amount of the drain generated in the drain pipe 2 cools after a certain period of time and stays in place. It is what
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、ドレン
管２内で生じたドレンが冷却され、その場に滞留する以
前にも急激な圧力変動が系内に及ぶことがあり、飽和温
度を保っているドレンにフラッシングが起こる。すなわ
ち、一般に、ドレンが冷却される前にドレン管２内でド
レンが満たされる過程があり、このときはドレンの飽和
温度が維持され、その温度から降下が始まって一定時間
後に冷却されるという経過をたどるために、蒸気母管１
で生じた圧力降下が飽和温度のドレンの滞留するドレン
管２に及ぶと、ドレンがフラッシングを起こす。However, even before the drain generated in the drain pipe 2 is cooled and stays in the drain pipe 2, a sudden pressure change may occur in the system, and the saturation temperature is maintained. Flushing occurs in the drain. That is, in general, there is a process in which the drain is filled in the drain pipe 2 before the drain is cooled, and at this time, the saturation temperature of the drain is maintained, the temperature starts to drop from that temperature, and the drain is cooled after a certain time. For tracing the steam main tube 1
When the pressure drop generated in 1 reaches the drain pipe 2 where the drain at the saturation temperature stays, the drain causes flushing.
【０００７】また一方、ドレンの滞留中、蒸気と境界を
接しているドレンはドレン管２を通して伝わる蒸気母管
１からの熱でその蒸気圧力の飽和温度とほぼ等しい温度
を保っており、蒸気母管１で圧力降下があれば、境界部
で一部のドレンがフラッシングを生じる。On the other hand, during the accumulation of the drain, the drain that is in contact with the steam keeps a temperature almost equal to the saturation temperature of the steam pressure due to the heat from the steam mother pipe 1 transmitted through the drain pipe 2, If there is a pressure drop in the tube 1, some drain will flash at the interface.
【０００８】このように冷却して滞留する前の飽和ドレ
ンおよび常に蒸気と接して温度の下がらない飽和ドレン
がフラッシングを生じることに対して上記の提案されて
いる方法は有効な手段とはなり得ず、新たな解決方法が
望まれている。The above proposed method can be an effective means for the flushing of the saturated drain before cooling and staying and the saturated drain which is always in contact with the steam and whose temperature is not lowered. Instead, a new solution is desired.
【０００９】本発明の目的はドレン管内で飽和ドレンが
生成されるのを抑制し、フラッシングを生じさせないよ
うにした分岐管保温装置を提供することにある。An object of the present invention is to provide a branch pipe heat insulating device which suppresses the generation of saturated drain in the drain pipe and prevents flushing.
【００１０】[0010]
【課題を解決するための手段】本発明は上記の目的を達
成するために蒸気の主経路を構成する蒸気母管に蒸気の
流動域と通じさせた分岐管を設けたものにおいて、分岐
管の蒸気母管から止め弁にかけての一定区間にその分岐
管の分岐部よりも上流側で抽出される過熱蒸気を流動せ
しめるように蒸気母管から分岐している管路を設けたこ
とを特徴とするものである。In order to achieve the above-mentioned object, the present invention provides a steam main pipe forming a main path of steam with a branch pipe communicating with a flow region of the steam. It is characterized in that a pipeline branching from the steam mother pipe is provided in a certain section from the steam mother pipe to the stop valve so as to allow the superheated steam extracted upstream of the branch portion of the branch pipe to flow. It is a thing.
【００１１】[0011]
【作用】蒸気の流動域と通じている分岐管と結ばれる管
路は分岐管の分岐部よりも上流側に開口を臨ませ、この
開口で蒸気流の動圧によって抽出される蒸気が管路内に
導かれるようになっている。この蒸気は分岐管の止め弁
に至る手前から分岐管の内部に入って上方にかけて流動
する。この過程で分岐管の分岐部から一定区間が蒸気に
よって加熱されて高温となる。この蒸気は経路の終点で
ある蒸気母管内の分岐部に流れてそこで蒸気母管内を流
れる蒸気と合流させられる。[Function] The pipe connected to the branch pipe communicating with the flow region of the steam has an opening facing the upstream side of the branch portion of the branch pipe, and the steam extracted by the dynamic pressure of the steam flow at this opening It is designed to be guided inside. This steam flows into the inside of the branch pipe from above before reaching the stop valve of the branch pipe and flows upward. In this process, a certain section from the branch portion of the branch pipe is heated by the steam and becomes high in temperature. This steam flows to the branch point in the steam mother pipe which is the end point of the path, and is merged there with the steam flowing in the steam mother pipe.
【００１２】図２の動作説明図を参照して説明すると、
管路１３には蒸気母管１１内の蒸気流と対向する向きに
開口する蒸気入口１５が設けられ、ここで蒸気が抽出さ
れる。この蒸気は後記のように過熱蒸気であり、これが
管路１３を通って分岐管１２に達する。分岐管１２の分
岐部から止め弁にかけての一定区間は蒸気母管１１と通
じているので、分岐管１２内に流れた蒸気が上方に流動
し、このとき、蒸気の流動域となった分岐管１２は蒸気
と接して蒸気母管１１と同等の温度に保持される。 な
お、止め弁１４は蒸気の流動のためにこの間閉止され
る。このように蒸気母管１１から止め弁１４にかけての
一定区間が過熱蒸気の流動域として保持される。この過
熱蒸気となる条件について、蒸気タービンプラントを一
例として説明する。 蒸気圧力：２４６kg／cm2 ，蒸気
温度：５３８℃，エンタルピ：７９０kcal／kg，分岐管
および保温管仕様：外径６０．５ 肉厚１６．０ 延長
１０m 直管相当長さ２０m 保温厚さ：１２５mm，放散
熱量：１６３kcal／mh，母管内蒸気流速：６０ｍ／ｓ，
動圧：約２．３kg／cm2 ，抽出蒸気量：約３５００kg／
ｈ 単位時間あたりの熱放散後の蒸気の保有熱量を抽出
蒸気量で割ると、温度降下後の蒸気のエンタルピが求め
られる。計算値は動圧：約２．３kg／cm2 時に抽出蒸気
量：約３５００kg／ｈでの循環経路の圧力損失値とほぼ
釣りあうが、安全を見込み１０％の値とし３５０kg／ｈ
で計算してみると、次のようになる。The operation will be described with reference to the operation explanatory view of FIG.
The pipe line 13 is provided with a steam inlet 15 that opens in a direction facing the steam flow in the steam mother pipe 11, and the steam is extracted here. This steam is superheated steam as will be described later, and reaches the branch pipe 12 through the pipe line 13. Since a certain section from the branch portion of the branch pipe 12 to the stop valve communicates with the steam mother pipe 11, the steam flowing in the branch pipe 12 flows upward, and at this time, the branch pipe becomes a flow region of the steam. 12 contacts the steam and is maintained at the same temperature as the steam mother tube 11. The stop valve 14 is closed during this time due to the flow of steam. In this way, a certain section from the steam mother pipe 11 to the stop valve 14 is held as a flow region of superheated steam. The conditions for this superheated steam will be described by taking a steam turbine plant as an example. Steam pressure: 246 kg / cm 2 , steam temperature: 538 ° C, enthalpy: 790 kcal / kg, branch pipe and heat retaining pipe specifications: outer diameter 60.5 wall thickness 16.0 extension 10 m, straight pipe equivalent length 20 m heat retaining thickness: 125 mm , Heat dissipation: 163kcal / mh, steam velocity in the mother tube: 60m / s,
Dynamic pressure: about 2.3 kg / cm 2 , extracted steam amount: about 3500 kg /
h The enthalpy of the steam after the temperature drop is obtained by dividing the retained heat quantity of the steam after heat dissipation per unit time by the extracted steam quantity. The calculated value is approximately balanced with the pressure loss value of the circulation path at a dynamic pressure of about 2.3 kg / cm 2 at an extracted vapor amount of about 3500 kg / h, but with a safety goal of 10%, 350 kg / h
The result is as follows.
【００１３】[0013]
【数１】 [Equation 1]
【００１４】このエンタルピ値の蒸気圧力：２４６kg／
cm2 の状態での蒸気温度は蒸気表によれば約５３１℃と
なり、温度降下は僅かに７℃であり、蒸気圧力：２４６
kg／cm2 での飽和温度であるところの３８１℃を大きく
上回っている。つまり、原理上ドレンは発生しない。よ
って、本発明の管路１３を用いるならば分岐管１２内は
過熱蒸気温度レベルとなって、飽和ドレンが生成される
ことがない。Steam pressure of this enthalpy value: 246 kg /
According to the steam table, the steam temperature in the cm 2 state is about 531 ° C, the temperature drop is only 7 ° C, and the steam pressure: 246
It greatly exceeds the saturation temperature of 381 ° C in kg / cm 2 . In other words, drainage does not occur in principle. Therefore, if the pipe line 13 of the present invention is used, the inside of the branch pipe 12 will reach the superheated steam temperature level and saturated drain will not be generated.
【００１５】したがって、ドレンのフラッシングが起こ
り得ないので、熱衝撃に起因するところの苛酷な状況が
構成材料にもたらされるのを回避することができる。Therefore, since the flushing of the drain cannot occur, it is possible to prevent the constituent material from being subjected to a severe condition due to thermal shock.
【００１６】[0016]
【実施例】以下、好適な実施例である蒸気タービンプラ
ントに対する適用例を図１および図３ないし図６を参照
して説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An application example of a steam turbine plant which is a preferred embodiment will be described below with reference to FIGS. 1 and 3 to 6.
【００１７】図１の実施例は異形管部の動圧を利用する
ことに特徴を有する。一端をボイラと結ばれる蒸気母管
２１の異形管２７からドレン弁２６に至る手前のドレン
管２２の下端に結ばれるウォーミング蒸気管２３が分岐
しており、蒸気入口２５をボイラからの蒸気流に向かっ
て開口しているリード管２４が上記の分岐部に設けられ
ている。The embodiment of FIG. 1 is characterized in that the dynamic pressure of the deformed pipe portion is utilized. A warming steam pipe 23 connected to the lower end of the drain pipe 22 before reaching the drain valve 26 from the deformed pipe 27 of the steam mother pipe 21 having one end connected to the boiler is branched, and the steam inlet 25 is connected to the steam flow from the boiler. A lead tube 24, which opens toward, is provided at the branching portion.
【００１８】上記構成において、プラントの起動時のウ
ォーミング過程で蒸気母管２１内で発生した多量のドレ
ンはドレン管２２を介して抽出され、ドレン弁２６を経
て系外のブロータンク（図示せず）等へ排出される。蒸
気母管２１のウォーミングが終了した後、蒸気タービン
の運転が開始され、一定の負荷に到達した時点でドレン
弁２６が全閉される。In the above structure, a large amount of drain generated in the steam mother pipe 21 during the warming process at the time of starting the plant is extracted through the drain pipe 22 and passed through the drain valve 26 to a blow tank (not shown) outside the system. )) Etc. After the warming of the steam mother pipe 21 is completed, the operation of the steam turbine is started, and the drain valve 26 is fully closed when a certain load is reached.
【００１９】一方、プラント運転中、蒸気入口２５で蒸
気流の偏流衝突に伴なう動圧により蒸気の一部がリード
管２４内に抽出され、ウォーミング蒸気管２３を通って
ドレン管２２に流れ、内部を上方にかけて流動する。こ
の過程でドレン管２２の分岐部から一定区間が蒸気によ
って加熱されて過熱蒸気レベルの温度となる。蒸気は、
この後、ドレン管２２の分岐部で蒸気母管２１内を流れ
る蒸気と合流させられる。 次に示す実施例は蒸気弁に
接続されるドレン管がドレン弁の下流側でドレン管に接
続されることに特徴を有する。すなわち、図３におい
て、蒸気母管２１の経路に２つの蒸気弁２８、２９が設
けられており、蒸気弁２８に接続されたドレン管３０の
他端がドレン弁３１の下流側で蒸気母管２１から分岐し
ているドレン管２２と結ばれている。On the other hand, during operation of the plant, a part of the steam is extracted into the lead pipe 24 due to the dynamic pressure caused by the non-uniform collision of the steam flow at the steam inlet 25, passes through the warming steam pipe 23 and reaches the drain pipe 22. It flows and flows upwards inside. In this process, a certain section from the branch portion of the drain pipe 22 is heated by the steam to reach the superheated steam level temperature. Steam is
After that, it is combined with the steam flowing in the steam mother pipe 21 at the branch portion of the drain pipe 22. The following embodiment is characterized in that the drain pipe connected to the steam valve is connected to the drain pipe downstream of the drain valve. That is, in FIG. 3, two steam valves 28 and 29 are provided in the path of the steam mother pipe 21, and the other end of the drain pipe 30 connected to the steam valve 28 is on the downstream side of the drain valve 31. It is connected to a drain pipe 22 branching from 21.
【００２０】上記構成において、プラント起動時のウォ
ーミング過程ではドレン弁３１は全閉され、蒸気母管２
１内で発生する多量のドレンはドレン管２２を通して抽
出され、ドレン弁２６を経てブロータンク（図示せず）
に排出される。蒸気母管２１のウォーミングが終了した
後、ドレン弁３１は全開され、ドレン管２２の分岐部か
ら蒸気弁２８までのドレンが排出される。この後、蒸気
弁２８はリセットされ、蒸気弁２９のウォーミングを経
て蒸気タービンが起動される。さらに、負荷が一定の値
に到達した後に、ドレン弁２６が全閉される。In the above structure, the drain valve 31 is fully closed during the warming process when the plant is started, and the steam mother pipe 2
A large amount of drain generated in the No. 1 is extracted through the drain pipe 22, passes through the drain valve 26, and is a blow tank (not shown).
Is discharged to. After the warming of the steam mother pipe 21 is completed, the drain valve 31 is fully opened, and the drain from the branch portion of the drain pipe 22 to the steam valve 28 is discharged. After that, the steam valve 28 is reset, and the steam turbine is started after the steam valve 29 is warmed. Further, after the load reaches a certain value, the drain valve 26 is fully closed.
【００２１】一方、プラント運転中、蒸気入口２５を通
して高速の蒸気流の衝突に伴なう動圧によって蒸気母管
２１内を流れる蒸気がリード管２４内に抽出され、ウォ
ーミング蒸気管２３を通過した後に一方はドレン管２２
を通って蒸気母管２２に、他方はドレン管３０を経由し
て蒸気弁２８に還る２つの流れが形成される。これによ
り、双方のドレン管２２、３０の一定区間が加熱されて
過熱蒸気レベルの温度となる。On the other hand, during operation of the plant, the steam flowing in the steam mother pipe 21 is extracted into the lead pipe 24 through the steam inlet 25 by the dynamic pressure accompanying the collision of the high-speed steam flow, and passes through the warming steam pipe 23. After doing one is the drain pipe 22
Two streams are formed, passing through to the steam mother pipe 22 and the other to the steam valve 28 via the drain pipe 30. As a result, a certain section of both drain pipes 22 and 30 is heated to the temperature of the superheated steam level.
【００２２】さらに、図４を参照して他の実施例を説明
する。ウォーミング蒸気管が使用されるのは上記各実施
例と同様であるが、本実施例は双方の分岐部の間に絞り
手段を設けることに特徴がある。Further, another embodiment will be described with reference to FIG. The warming steam pipe is used in the same manner as in each of the above-described embodiments, but this embodiment is characterized in that throttling means is provided between both branch portions.
【００２３】図に示されるように蒸気母管２１内のドレ
ン管２２およびウォーミング蒸気管２３の分岐部の中央
部に絞り手段、たとえば絞り環３２が設けられる。円形
プレートの中心に蒸気流路となる決められた口径の中心
孔を穿って形成される絞り環３２は双方の間に僅かな圧
力差を生じさせることに狙いがあり、口径はそれ程小さ
くする必要はない。As shown in the figure, a throttle means, for example, a throttle ring 32 is provided at the center of the branch portion of the drain pipe 22 and the warming steam pipe 23 in the steam mother pipe 21. The throttle ring 32, which is formed by drilling a center hole of a fixed diameter that serves as a vapor flow path in the center of a circular plate, is aimed at causing a slight pressure difference between the two, and the diameter needs to be so small. There is no.
【００２４】プラント起動時における各構成の働きは図
１に示される実施例とほぼ同様であり、蒸気母管２１内
のドレンはドレン管２２によって系外に除かれる。The operation of each component at the time of starting the plant is almost the same as that of the embodiment shown in FIG. 1, and the drain inside the steam mother pipe 21 is removed outside the system by the drain pipe 22.
【００２５】一方、プラント運転中、蒸気母管２１内で
は絞り環３２の前後に僅かに圧力差が生じる。すなわ
ち、蒸気流は絞り環３２の直後で静圧の低下が生じて蒸
気がウォーミング蒸気管２３に抽出されてドレン管２２
を通る蒸気の流れが形成され、ドレン管２２が加熱され
る。On the other hand, during the plant operation, a slight pressure difference is generated in the steam mother pipe 21 before and after the throttle ring 32. That is, in the steam flow, the static pressure decreases immediately after the throttle ring 32, the steam is extracted into the warming steam pipe 23, and the drain pipe 22.
A vapor stream is formed therethrough and the drain tube 22 is heated.
【００２６】また、次に述べる実施例はリード管を蒸気
母管内に差し込むことに特徴を有する。図５に示される
ようにリード管２４は蒸気母管２１の中心付近に延ばさ
れ、蒸気流の最も速い部分に蒸気入口２５を開口させて
いる。The embodiment described below is also characterized in that the lead tube is inserted into the steam mother tube. As shown in FIG. 5, the lead pipe 24 extends near the center of the steam mother pipe 21 and opens the steam inlet 25 at the fastest part of the steam flow.
【００２７】プラント起動時における各構成の働きは図
１に示されるものとほぼ同様であり、蒸気母管２１内で
生じるドレンは残らずドレン管２２を通して系外に除か
れる。 一方、プラント運転中、蒸気流の中心に望ませ
た蒸気入口２５では蒸気流の動圧によって蒸気が抽出さ
れ、これがリード管２４に導かれる。この蒸気はウォー
ミング蒸気管２３からドレン管２２に流れ、内部を上方
に流動する。これによりドレン管２２の一定区間が蒸気
によって加熱される。The operation of each component at the time of starting the plant is almost the same as that shown in FIG. 1, and any drain generated in the steam mother pipe 21 is removed to the outside of the system through the drain pipe 22. On the other hand, during operation of the plant, steam is extracted by the dynamic pressure of the steam flow at the steam inlet 25, which is desired at the center of the steam flow, and is guided to the reed pipe 24. This steam flows from the warming steam pipe 23 to the drain pipe 22, and flows upward inside. As a result, a certain section of the drain pipe 22 is heated by the steam.
【００２８】さらに、図６は別な実施例を示すもので、
これは上記各実施例におけるドレン管の場合と異なり、
上方に延びる分岐管への適用例である。このような分岐
管には圧力計などの計器類のための蒸気取出し部が含ま
れ、分岐管から飽和ドレンが滴下するのを防止すること
に狙いをおく。Further, FIG. 6 shows another embodiment,
This is different from the case of the drain pipe in each of the above embodiments,
It is an example of application to a branch pipe extending upward. Such a branch pipe includes a vapor take-out portion for instruments such as a pressure gauge, and aims at preventing saturated drain from dripping from the branch pipe.
【００２９】図６において、計器用蒸気管３３が蒸気母
管２１から上方に分岐され、その先端で圧力計３４と結
ばれている。圧力計３４の入口には計器元弁３５が設け
られ、ウォーミング蒸気管２３はこの計器元弁３５の上
流側に結ばれている。プラント運転中、蒸気入口２５で
蒸気流の動圧によって蒸気が抽出され、これがリード管
２４に導かれる。この蒸気はウォーミング蒸気管２３を
通って計器用蒸気管３３に流れ、内部を下方に流動す
る。これにより、計器用蒸気管３３の分岐部から一定区
間が蒸気によって加熱される。In FIG. 6, an instrument steam pipe 33 branches upward from the steam mother pipe 21 and is connected to a pressure gauge 34 at its tip. A meter main valve 35 is provided at the inlet of the pressure gauge 34, and the warming steam pipe 23 is connected to the upstream side of the meter main valve 35. During plant operation, steam is extracted at the steam inlet 25 by the dynamic pressure of the steam flow, and this is guided to the reed pipe 24. This steam flows through the warming steam pipe 23 to the instrument steam pipe 33, and flows downward inside. As a result, a certain section is heated by the steam from the branch portion of the instrument steam pipe 33.
【００３０】[0030]
【発明の効果】以上説明したように本発明においては分
岐管の分岐部よりも上流側の蒸気母管の蒸気流動域に蒸
気入口を臨ませ、分岐管の蒸気母管から止め弁にかけて
の一定区間と連通する管路を設けているので、蒸気入口
で抽出される蒸気によって分岐管一定区間を加熱するこ
とができ、分岐管内で飽和ドレンが生成されることがな
い。As described above, according to the present invention, the steam inlet of the steam pipe of the upstream side of the branch portion of the branch pipe is made to face the steam flow region of the branch pipe, and the constant flow from the steam mother pipe of the branch pipe to the stop valve is achieved. Since the pipeline communicating with the section is provided, the constant section of the branch tube can be heated by the steam extracted at the steam inlet, and the saturated drain is not generated in the branch tube.
【００３１】したがって、本発明によれば、飽和ドレン
のフラッシングおよび飽和ドレンの蒸気母管側への滴下
を抑制することができ、蒸気母管における熱衝撃をなく
すことが可能である。Therefore, according to the present invention, flushing of saturated drain and dripping of saturated drain to the steam mother pipe side can be suppressed, and thermal shock in the steam mother pipe can be eliminated.
【図１】本発明による分岐管保温装置の一実施例を示す
構成図。FIG. 1 is a configuration diagram showing an embodiment of a branch pipe heat insulating device according to the present invention.
【図２】本発明による保温装置の動作を説明するための
図。FIG. 2 is a diagram for explaining the operation of the heat retaining device according to the present invention.
【図３】本発明による分岐管保温装置の他の実施例を示
す構成図。FIG. 3 is a configuration diagram showing another embodiment of the branch pipe heat retention device according to the present invention.
【図４】本発明による分岐管保温装置の他の実施例を示
す構成図。FIG. 4 is a configuration diagram showing another embodiment of the branch pipe heat retention device according to the present invention.
【図５】本発明による分岐管保温装置の他の実施例を示
す構成図。FIG. 5 is a configuration diagram showing another embodiment of the branch pipe heat retention device according to the present invention.
【図６】本発明による分岐管保温装置の他の実施例を示
す構成図。FIG. 6 is a configuration diagram showing another embodiment of the branch pipe heat retention device according to the present invention.
【図７】従来の断熱材を装着した分岐管を示す構成図。FIG. 7 is a configuration diagram showing a branch pipe provided with a conventional heat insulating material.
【図８】従来の放熱フィンを備えた分岐管を示す構成
図。FIG. 8 is a configuration diagram showing a branch pipe provided with a conventional radiation fin.
２１…蒸気母管、２２、３０…ドレン管、２３…ウォー
ミング蒸気管、２４…リード管、２５…蒸気入口、２
６、３１…ドレン弁、３３…計器用蒸気管、３５…計器
元弁。21 ... Steam mother pipe, 22, 30 ... Drain pipe, 23 ... Warming steam pipe, 24 ... Reed pipe, 25 ... Steam inlet, 2
6, 31 ... Drain valve, 33 ... Steam pipe for instrument, 35 ... Main valve of instrument.
Claims (2)
の流動域と通じさせた分岐管を設けたものにおいて、前
記分岐管の該蒸気母管から止め弁にかけての一定区間に
その分岐管の分岐部よりも上流側で抽出される過熱蒸気
を流動せしめるように該蒸気母管から分岐している管路
を設けたことを特徴とする分岐管保温装置。1. A steam main pipe constituting a main steam path is provided with a branch pipe communicating with a flow region of the steam, and the branch pipe is branched into a certain section from the steam main pipe to a stop valve. A branch pipe heat retention device, characterized in that a pipe path branched from the steam mother pipe is provided so as to allow the superheated steam extracted upstream of the branch portion of the pipe to flow.
向かって開口させたリード管を有する請求項１記載の分
岐管保温装置。2. The branch pipe heat insulating device according to claim 1, further comprising a lead pipe having a steam inlet opened toward a steam flow at a branch portion of the pipe line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3285159A JP2856582B2 (en) | 1991-10-30 | 1991-10-30 | Branch pipe warmer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3285159A JP2856582B2 (en) | 1991-10-30 | 1991-10-30 | Branch pipe warmer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05125907A true JPH05125907A (en) | 1993-05-21 |
| JP2856582B2 JP2856582B2 (en) | 1999-02-10 |
Family
ID=17687852
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3285159A Expired - Fee Related JP2856582B2 (en) | 1991-10-30 | 1991-10-30 | Branch pipe warmer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2856582B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008274817A (en) * | 2007-04-27 | 2008-11-13 | Hitachi Ltd | Steam turbine cylinder communication pipe |
| JP2013029271A (en) * | 2011-07-29 | 2013-02-07 | Mitsubishi Heavy Ind Ltd | Steam pipe structure |
| JP2015140686A (en) * | 2014-01-27 | 2015-08-03 | 株式会社東芝 | Steam turbine pipe |
| CN112638159A (en) * | 2018-08-30 | 2021-04-09 | 株式会社小鸡 | Steam heating unit, steam heating method, dessert manufacturing device, and dessert manufacturing method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4827329A (en) * | 1971-07-30 | 1973-04-11 |
-
1991
- 1991-10-30 JP JP3285159A patent/JP2856582B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4827329A (en) * | 1971-07-30 | 1973-04-11 |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008274817A (en) * | 2007-04-27 | 2008-11-13 | Hitachi Ltd | Steam turbine cylinder communication pipe |
| JP2013029271A (en) * | 2011-07-29 | 2013-02-07 | Mitsubishi Heavy Ind Ltd | Steam pipe structure |
| JP2015140686A (en) * | 2014-01-27 | 2015-08-03 | 株式会社東芝 | Steam turbine pipe |
| CN112638159A (en) * | 2018-08-30 | 2021-04-09 | 株式会社小鸡 | Steam heating unit, steam heating method, dessert manufacturing device, and dessert manufacturing method |
| CN112638159B (en) * | 2018-08-30 | 2022-04-29 | 株式会社小鸡 | Steam heating unit, steam heating method, dessert manufacturing device, and dessert manufacturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2856582B2 (en) | 1999-02-10 |
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