JP2020153662A - Boiler water level measuring device - Google Patents

Boiler water level measuring device Download PDF

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JP2020153662A
JP2020153662A JP2019049246A JP2019049246A JP2020153662A JP 2020153662 A JP2020153662 A JP 2020153662A JP 2019049246 A JP2019049246 A JP 2019049246A JP 2019049246 A JP2019049246 A JP 2019049246A JP 2020153662 A JP2020153662 A JP 2020153662A
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water
water level
steam
column pipe
boiler
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JP7349123B2 (en
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正成 木下
Masashige Kinoshita
正成 木下
孝太郎 藤原
Kotaro Fujiwara
孝太郎 藤原
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Hirakawa Corp
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Abstract

To solve the problem that the water level of a boiler cannot be measured correctly while components contained in condensed water are repeatedly retained at a boundary between a water column pipe and a steam side pressure guiding pipe, a scale generated at the boundary becomes large, and eventually, the boundary will be closed with the scale, and the pressure of steam will not be transmitted to a water level transmitter beyond the closed end.SOLUTION: This is a boiler water level measuring device in which, receiving pressure of water 21 and pressure of steam 20 in a water column pipe 6 attached to the boiler and using pressure difference between pressure based on the water level in the water column pipe 6 and pressure based on a reference water level, a water level 22 in a water column pipe 6 is measured by a differential pressure type water level transmitter 9. Water is interposed in a path 7 that guides the pressure of the steam 20 in the water column pipe 6 to the differential pressure type water level transmitter 9, and a water level 23 of this water is used as the reference water level. The position of a water surface in the path 7 is set so that the path 7 can be prevented from being blocked by the scale generated by the condensation of steam guided to the path 7.SELECTED DRAWING: Figure 1

Description

本発明は、ボイラの水位測定装置に関する。 The present invention relates to a boiler water level measuring device.

ボイラは、その中に蒸気と水が入っている。ボイラの低い水位による事故の防止を目的として、ボイラの水位を測定するために、水柱管が用いられている。図８に、従来の水柱管６の例を示す。水柱管６は、ボイラの内部に連通されて、ボイラ内の熱水と水蒸気とが導かれる。詳細には、図８に示すように、ボイラにおいて蒸気が存在する上部５０と、ボイラにおいて水が存在する下部へつながるフランジ５１とには、それぞれ蒸気側連絡管４と水側連絡管５とをつないで、水柱管６へ接続している。すなわち、水柱管６は、水側連絡管５によってボイラ内の水と連通し、蒸気側連絡管４によってボイラ内の蒸気と連通する。 The boiler contains steam and water in it. Water column pipes are used to measure the water level of the boiler for the purpose of preventing accidents due to the low water level of the boiler. FIG. 8 shows an example of the conventional water column pipe 6. The water column pipe 6 is communicated with the inside of the boiler, and hot water and steam in the boiler are guided. Specifically, as shown in FIG. 8, the upper portion 50 in which steam is present in the boiler and the flange 51 connected to the lower portion in which water is present in the boiler are provided with a steam side connecting pipe 4 and a water side connecting pipe 5, respectively. It is connected to the water column pipe 6. That is, the water column pipe 6 communicates with the water in the boiler by the water side connecting pipe 5, and communicates with the steam in the boiler by the steam side connecting pipe 4.

水柱管６において、その上部の蒸気２０が存在しているところと、その下部の水２１が存在しているところとには、それぞれ蒸気側導圧管７と水側導圧管８とをつないで、差圧式水位発信器９へ接続している。蒸気側導圧管７にはドレンポット１０を設ける。ドレンポット１０には、差圧式水位発信器９から上向きに水１１をためており、一方で水側導圧管８には、差圧式水位発信器９から上向きに水２１をためている。差圧式水位発信器９には両者の水による圧力がかかり、ドレンポット１０でためられた水１１による圧力と水側導圧管８にためられた水２１による圧力との差を、差圧式水位発信器９が検出する。ドレンポット１０内の水位１４は変化しないため、たとえば水柱管６内の水位２２が通常より低くなったときに、差圧式水位発信器９で検出される圧力の差は大きくなる。ボイラの水位は、水柱管６内の水位２２と等しいため、水柱管６内の水位２２の状態を確認することで、ボイラの水位が通常より低いかどうかを確認できる。同様にボイラ内の水位が通常より高いかどうかも確認できる。図８に示される装置は、特許文献１に記載されている。 In the water column pipe 6, the steam side pressure pipe 7 and the water side pressure pipe 8 are connected to the place where the steam 20 is present above the water column pipe 6 and the place where the water 21 is present below the water column pipe 6, respectively. It is connected to the differential pressure type water level transmitter 9. A drain pot 10 is provided on the steam side pressure guiding tube 7. Water 11 is stored upward from the differential pressure type water level transmitter 9 in the drain pot 10, while water 21 is stored upward from the differential pressure type water level transmitter 9 in the water side pressure guiding pipe 8. Pressure is applied to the differential pressure type water level transmitter 9 by both waters, and the difference between the pressure due to the water 11 stored in the drain pot 10 and the pressure due to the water 21 stored in the water side pressure guiding tube 8 is transmitted to the differential pressure type water level transmitter 9. The vessel 9 detects it. Since the water level 14 in the drain pot 10 does not change, for example, when the water level 22 in the water column pipe 6 becomes lower than usual, the difference in pressure detected by the differential pressure type water level transmitter 9 becomes large. Since the water level of the boiler is equal to the water level 22 in the water column pipe 6, it is possible to confirm whether or not the water level of the boiler is lower than usual by checking the state of the water level 22 in the water column pipe 6. Similarly, it can be confirmed whether the water level in the boiler is higher than usual. The device shown in FIG. 8 is described in Patent Document 1.

特開２０１０−２３６７９０号公報JP-A-2010-236790

図８の装置において、水柱管６内の蒸気２０は、蒸気側導圧管７とドレンポット１０とに流入する。蒸気側導圧管７とドレンポット１０とは、水柱管６よりもボイラから離れており、水柱管６を除き、熱源がないこともあり、水柱管６内よりも温度が低く、流入した蒸気の一部は冷やされて凝縮水となる。すると、凝縮水に含まれる酸化鉄などの成分はその場に残り、スケールとなる。蒸気量の多い場所だと多量の凝縮水が発生しやすく、水柱管６と蒸気側導圧管７との境目１２や境目１２の近傍では蒸気量は多いため、スケールがたまりやすい。 In the device of FIG. 8, the steam 20 in the water column pipe 6 flows into the steam side pressure guiding pipe 7 and the drain pot 10. The steam side pressure guiding pipe 7 and the drain pot 10 are farther from the boiler than the water column pipe 6, and there may be no heat source except for the water column pipe 6, so the temperature is lower than that in the water column pipe 6 and the inflowing steam Part of it is cooled to become condensed water. Then, components such as iron oxide contained in the condensed water remain in place and become scale. In a place with a large amount of steam, a large amount of condensed water is likely to be generated, and since the amount of steam is large in the vicinity of the boundary 12 and the boundary 12 between the water column pipe 6 and the steam side pressure guiding pipe 7, the scale tends to accumulate.

水柱管６と蒸気側導圧管７との境目１２で、凝縮水に含有される酸化鉄などの残留が繰り返され、境目１２で生じるスケールが大きくなる。最終的には水柱管６と蒸気側導圧管７の境目１２がスケールで塞がり、塞がった先の水位発信器９に蒸気の圧力が伝わらなくなり、ボイラの水位を正しく測れなくなる。 At the boundary 12 between the water column tube 6 and the steam side pressure guiding tube 7, iron oxide and the like contained in the condensed water are repeatedly left, and the scale generated at the boundary 12 becomes large. Eventually, the boundary 12 between the water column pipe 6 and the steam side pressure guiding pipe 7 is blocked by a scale, the steam pressure is not transmitted to the water level transmitter 9 at the blocked end, and the water level of the boiler cannot be measured correctly.

本発明は、スケールによって、差圧式水位発信器９に伝えられる圧力が不安定となり、ボイラの水位を正しく測れなくなることの回避を目的とする。 An object of the present invention is to avoid that the pressure transmitted to the differential pressure type water level transmitter 9 becomes unstable due to the scale, and the water level of the boiler cannot be measured correctly.

上記の目的を達成するために、本発明は、ボイラに併設された水柱管内の水の圧力と蒸気側の基準水位の圧力とを受けて、水柱管内の水位に基づく圧力と基準水位に基づく圧力との圧力差から、差圧式水位発信器によって水柱管内の水位を測定するようにしたボイラの水位測定装置において、水柱管内の蒸気側の基準水位圧力を差圧式水位発信器に導く経路に水を介在させて、この水の水位を基準水位とし、前記経路内の水面の位置を、前記経路に導かれる蒸気の凝縮により発生するスケールによって前記経路が塞がれることを防止可能な位置としたものである。 In order to achieve the above object, the present invention receives the pressure of the water in the water column pipe attached to the boiler and the pressure of the reference water level on the steam side, and the pressure based on the water level in the water column pipe and the pressure based on the reference water level. In the water level measuring device of the boiler in which the water level in the water column pipe is measured by the differential pressure type water level transmitter from the pressure difference with, water is sent to the path leading the reference water level pressure on the steam side in the water column pipe to the differential pressure type water level transmitter. Interveningly, the water level of this water is set as the reference water level, and the position of the water surface in the path is set to a position where the path can be prevented from being blocked by the scale generated by the condensation of the steam guided to the path. Is.

本発明の１つの形態として、水柱管とドレンポットとの間に蒸気側導圧管を挟まず、水柱管の壁に直付けしたドレンポットを設ける。水柱管におけるドレンポットが直付けされた壁には孔を設け、水柱管とドレンポットとの間で蒸気が出入りできる。ドレンポットの水面は孔の下縁に位置する。 As one embodiment of the present invention, a drain pot directly attached to the wall of the water column pipe is provided without sandwiching the steam side pressure guiding tube between the water column pipe and the drain pot. A hole is provided in the wall of the water column pipe to which the drain pot is directly attached so that steam can flow in and out between the water column pipe and the drain pot. The water surface of the drain pot is located at the lower edge of the hole.

本発明のもう１つの形態として、水柱管から水位発信器に導かれる蒸気側導圧管の端部を水柱管の内部に挿入し、蒸気側導圧管内に水を満たすとともに蒸気側導圧管の端部を水柱管の内部で開孔させる。水が満たされた蒸気側導圧管の開孔部に水面が形成され、この水面が、水柱管の内部の蒸気の圧力を受けて、この圧力を蒸気側導圧管内の水を通して水位発信器に伝達する。ドレンポットは設置されない。 As another embodiment of the present invention, the end of the steam side pressure guiding pipe led from the water column pipe to the water level transmitter is inserted into the water column pipe to fill the steam side pressure guiding pipe with water and the end of the steam side pressure guiding pipe. The part is opened inside the water column pipe. A water surface is formed in the opening of the steam-side pressure guiding tube filled with water, and this water surface receives the pressure of the steam inside the water column tube and transfers this pressure to the water level transmitter through the water in the steam-side pressure guiding tube. introduce. No drain pot will be installed.

以上のように、水柱管と蒸気側導圧管との間に水をためた設備を挟み、凝縮水が発生する空間を小さくし、凝縮水が水柱管に流れる量を減らすことで、スケールがたまりやすい場所をなくし、スケールによって塞がりやすい場所をなくすことができる。 As described above, the scale accumulates by sandwiching the equipment that stores water between the water column pipe and the steam side pressure guiding pipe, reducing the space where condensed water is generated, and reducing the amount of condensed water flowing into the water column pipe. You can eliminate easy places and eliminate easy places to be blocked by the scale.

この発明の１つの実施の形態に係る、ボイラの水位測定装置の概略構成を示す図である。It is a figure which shows the schematic structure of the water level measuring apparatus of a boiler which concerns on one Embodiment of this invention. この発明のもう１つの実施の形態に係る、ボイラの水位測定装置の概略構成を示す図である。It is a figure which shows the schematic structure of the water level measuring apparatus of a boiler which concerns on another embodiment of this invention. 図１のドレンポットに開けられた孔の１つの例を示す図である。It is a figure which shows one example of the hole made in the drain pot of FIG. 図１における水柱管へのドレンポットの取り付け構造を示す図である。It is a figure which shows the attachment structure of the drain pot to the water column pipe in FIG. 図１のドレンポットに開けられた孔のもう１つの例を示す図である。It is a figure which shows another example of the hole made in the drain pot of FIG. 図５の孔を有するドレンポットの構造を示す図である。It is a figure which shows the structure of the drain pot which has the hole of FIG. 図２の蒸気側導圧管の先端の形状のもう１つの例を示す図である。It is a figure which shows another example of the shape of the tip of the steam side pressure guiding tube of FIG. 従来のボイラの水位測定装置の概略構成を示す図である。It is a figure which shows the schematic structure of the water level measuring apparatus of the conventional boiler.

以下、この発明の実施の形態を図面を参照しつつ説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

実施の形態１
図１は、本発明の実施の形態１のボイラの水位測定装置１００を示す。ボイラの水位測定装置１００は、水柱管６と、横向きに円柱型のドレンポット３０と、差圧式水位発信器９とを備えている。ボイラの水位測定装置１００における、水柱管６とドレンポット３０と差圧式水位発信器９とのつながりは以下のとおりである。 Embodiment 1
FIG. 1 shows a water level measuring device 100 for a boiler according to a first embodiment of the present invention. The water level measuring device 100 of the boiler includes a water column pipe 6, a laterally cylindrical drain pot 30, and a differential pressure type water level transmitter 9. The connection between the water column pipe 6, the drain pot 30, and the differential pressure type water level transmitter 9 in the water level measuring device 100 of the boiler is as follows.

全体の図示を省略したボイラには水が入っており、蒸気を発生させる。蒸気を水から発生させるので、蒸気がボイラ内で上昇し、蒸気の一部はボイラの上部５０にまで上がる。この蒸気の一部は、ボイラの上部５０から蒸気側連絡管４に流入する。 The boiler, which is not shown as a whole, contains water and generates steam. As the steam is generated from the water, the steam rises in the boiler and some of the steam rises to the top 50 of the boiler. A part of this steam flows into the steam side connecting pipe 4 from the upper part 50 of the boiler.

ボイラ内の蒸発していない水はボイラの中の下部に入ったままであるが、その一部はボイラへつながるフランジ５１に向かい、フランジ５１から水側連絡管５に流入する。 The non-evaporated water in the boiler remains in the lower part of the boiler, but a part of it goes toward the flange 51 leading to the boiler and flows from the flange 51 into the water side connecting pipe 5.

２つの連絡管４、５は水柱管６につなげられている。 The two connecting pipes 4 and 5 are connected to the water column pipe 6.

水柱管６は、密封構造の柱状の縦長の管であり、ボイラからの蒸気と水とが２つの連絡管４、５を通して導入される。 The water column pipe 6 is a columnar vertically long pipe having a sealed structure, and steam and water from the boiler are introduced through two connecting pipes 4 and 5.

水柱管６の中にボイラから蒸気と水とが流れ込み、水柱管６の中で水位２２が形成される。水柱管６の中での水位２２はボイラの水位と同じ高さである。水柱管６の中は水位２２を境に上には蒸気２０、水位２２から下には水２１が入っており、ボイラの水位が上昇すれば、水柱管６内の水位２２は追従して上昇し、ボイラの水位が低下すれば、水柱管６内の水位２２は追従して低下する。 Steam and water flow from the boiler into the water column pipe 6, and the water level 22 is formed in the water column pipe 6. The water level 22 in the water column pipe 6 is the same height as the water level of the boiler. Inside the water column pipe 6, steam 20 is contained above the water level 22 and water 21 is contained below the water level 22, and if the water level of the boiler rises, the water level 22 inside the water column pipe 6 will follow and rise. However, if the water level of the boiler drops, the water level 22 in the water column pipe 6 will follow and drop.

水柱管６における水位２２から上の部分には、横向きの円柱型のドレンポット３０を、配管を挟まずに直付けしている。そして、水柱管６から蒸気と水とをそれぞれドレンポット３０と水側導圧管８とに送り出し、送り出した蒸気と水との圧力を受ける差圧式水位発信器９にて水位を検出させる。ドレンポット３０と差圧式水位発信器９とは蒸気側導圧管７によって互いに接続されている。水柱管６の水位測定のために、ドレンポット３０から差圧式水位発信器９にわたって水をためて、ドレンポット３０の内部に水位２３が形成されている。ドレンポット３０内の水位２３は、水柱管６内の水２１による水位２２よりも高い。 A horizontal cylindrical drain pot 30 is directly attached to the portion of the water column pipe 6 above the water level 22 without sandwiching the pipe. Then, steam and water are sent from the water column pipe 6 to the drain pot 30 and the water side pressure guiding pipe 8, respectively, and the water level is detected by the differential pressure type water level transmitter 9 that receives the pressure of the sent steam and water. The drain pot 30 and the differential pressure type water level transmitter 9 are connected to each other by a steam side pressure guiding tube 7. For measuring the water level of the water column pipe 6, water is collected from the drain pot 30 through the differential pressure type water level transmitter 9, and the water level 23 is formed inside the drain pot 30. The water level 23 in the drain pot 30 is higher than the water level 22 due to the water 21 in the water column pipe 6.

水柱管６の蒸気の圧力がドレンポット３０に伝えられ、水柱管６の蒸気の圧力とドレンポット３０とにためられた水の水頭圧とが差圧式水位発信器９に伝達される。一方で、水柱管６の蒸気の圧力と、水柱管６の水位２２による水頭圧とが、差圧式水位発信器９に伝達される。 The pressure of the steam of the water column pipe 6 is transmitted to the drain pot 30, and the pressure of the steam of the water column pipe 6 and the head pressure of the water stored in the drain pot 30 are transmitted to the differential pressure type water level transmitter 9. On the other hand, the pressure of the steam of the water column pipe 6 and the head pressure of the water level 22 of the water column pipe 6 are transmitted to the differential pressure type water level transmitter 9.

ドレンポット３０と水柱管６との接続部分における壁の部分に孔３２があけられている。これによって、ドレンポット３０には、隣り合っている水柱管６内に入っている蒸気２０が孔３２を通って入り込む。ドレンポット３０の水位２３は、孔３２の下縁３３の位置となるようにされている。すなわち孔３２よりも下側の壁３６の部分が堰として機能する。ドレンポット３０には水差し３４が設けられ、水差し３４によりドレンポット３０内に水の追加が可能である。ドレンポット３０にはドレンポット３０内の水位を目視で点検できるように内部点検窓３５も設けられている。 A hole 32 is formed in a wall portion at a connecting portion between the drain pot 30 and the water column pipe 6. As a result, the steam 20 contained in the adjacent water column pipes 6 enters the drain pot 30 through the hole 32. The water level 23 of the drain pot 30 is set to the position of the lower edge 33 of the hole 32. That is, the portion of the wall 36 below the hole 32 functions as a weir. A jug 34 is provided in the drain pot 30, and water can be added to the drain pot 30 by the jug 34. The drain pot 30 is also provided with an internal inspection window 35 so that the water level in the drain pot 30 can be visually inspected.

差圧式水位発信器９では、蒸気側導圧管７と水側導圧管８とを通って伝えられる圧力の差を検出する。両方の導圧管７、８における蒸気圧は等しいので、その差圧はゼロである。よって、両方の導圧管７、８における水頭圧の差が検出されるが、蒸気側導圧管７につながったドレンポット３０の水位２３は一定であるため、差圧から水柱管６内の水位すなわちボイラの水位を測定することができる。 The differential pressure type water level transmitter 9 detects the difference in pressure transmitted through the steam side pressure guiding pipe 7 and the water side pressure guiding pipe 8. Since the vapor pressures in both pressure guiding tubes 7 and 8 are equal, the differential pressure is zero. Therefore, the difference in head pressure between both pressure guiding pipes 7 and 8 is detected, but since the water level 23 of the drain pot 30 connected to the steam side pressure guiding pipe 7 is constant, the water level in the water column pipe 6 from the differential pressure, that is, The water level of the boiler can be measured.

ドレンポット３０の内部の水位２３に関し、ドレンポット３０に至る経路やドレンポット３０の内部で蒸気が凝縮するが、凝縮水を蒸気側導圧管７などを介して水柱管６に戻す機能を有していることで、ドレンポット３０の内部の水の量は増減しない。つまり、ドレンポット３０内の蒸気が水により冷却されて凝縮しても水位上昇は起こらず、ドレンポット３０内の水位２３は変化しない。よって、その水頭圧も変化しない。 Regarding the water level 23 inside the drain pot 30, steam is condensed in the path leading to the drain pot 30 and inside the drain pot 30, but it has a function of returning the condensed water to the water column pipe 6 via the steam side pressure guiding pipe 7. As a result, the amount of water inside the drain pot 30 does not increase or decrease. That is, even if the steam in the drain pot 30 is cooled by water and condensed, the water level does not rise and the water level 23 in the drain pot 30 does not change. Therefore, the head pressure does not change either.

つぎに、このボイラの水位測定装置１００でのスケールの生成について説明する。水柱管６内の蒸気２０はドレンポット３０に流入し、流入した蒸気の一部はドレンポット３０内にたまった水や蒸気温度よりも低温のドレンポット３０の内壁などによって冷却されるため、蒸気から水へと凝縮する。凝縮により生じた水には酸化鉄などの成分が含まれており、この成分は残留してスケールとなる。 Next, the generation of the scale in the water level measuring device 100 of this boiler will be described. The steam 20 in the water column pipe 6 flows into the drain pot 30, and a part of the inflowing steam is cooled by the water accumulated in the drain pot 30 or the inner wall of the drain pot 30 having a temperature lower than the steam temperature. Condenses into water. The water produced by the condensation contains components such as iron oxide, and these components remain and become scale.

つぎに、ボイラの水位測定装置１００でのスケールがたまる場所について説明する。ドレンポット３０の内部の水面が、壁３６の上縁すなわち水柱管６とドレンポット３０とを連通させる孔３２の下縁３３まで到達しているため、水柱管６からドレンポット３０に流入する蒸気が冷却される場所は、ドレンポット３０内とドレンポット３０の孔３２とのみである。詳細には、ドレンポット３０は蒸気側導圧管７とつながっているが、ドレンポット３０には水がためられており、ドレンポット３０の孔３２からドレンポット３０に蒸気２０が流入しても、蒸気２０はドレンポット３０の水位２３よりも下にある蒸気側導圧管７に入ることはできない。蒸気側導圧管７内では、蒸気が入らないためにその凝縮が起こらず、凝縮による水の発生もない。このため、系全体として、図８に示す従来の系と比べて、凝縮により水が生じる箇所は減少する。ドレンポット３０内の水面では若干の凝縮が起こるだけであるので、スケールがたまりにくい。 Next, the place where the scale of the boiler water level measuring device 100 accumulates will be described. Since the water surface inside the drain pot 30 reaches the upper edge of the wall 36, that is, the lower edge 33 of the hole 32 that communicates the water column pipe 6 and the drain pot 30, the steam flowing into the drain pot 30 from the water column pipe 6 Is cooled only in the drain pot 30 and in the hole 32 of the drain pot 30. Specifically, the drain pot 30 is connected to the steam side pressure guiding tube 7, but water is stored in the drain pot 30, and even if the steam 20 flows into the drain pot 30 from the hole 32 of the drain pot 30, even if the steam 20 flows into the drain pot 30. The steam 20 cannot enter the steam side pressure guiding tube 7 below the water level 23 of the drain pot 30. In the steam side pressure guiding tube 7, since steam does not enter, the condensation does not occur, and water is not generated due to the condensation. Therefore, as a whole system, the number of places where water is generated due to condensation is reduced as compared with the conventional system shown in FIG. Since only a slight condensation occurs on the water surface in the drain pot 30, the scale is hard to accumulate.

ドレンポット３０に開けられた孔３２の形状はなんでもよいが、例の１つとして図３と図４とのような半円が挙げられる。半円の孔３２の弦の部分を孔３２の下縁３３とする。半円の半径は、円柱型のドレンポット３０の半径よりも若干小さめのサイズである。 The shape of the hole 32 formed in the drain pot 30 may be any shape, and one example is a semicircle as shown in FIGS. 3 and 4. The chord portion of the semicircular hole 32 is designated as the lower edge 33 of the hole 32. The radius of the semicircle is slightly smaller than the radius of the cylindrical drain pot 30.

孔３２の形状のもう１つの例として図５と図６との円を挙げることができる。図示の例では、円形の孔３２の直径はドレンポット３０の半径よりも若干小さめのサイズである。この場合も、孔３２の下縁３３が水位２３のレベルであり、ドレンポット３０の内部の水面が、水柱管６とドレンポット３０とを連通させる孔３２の下縁３３まで到達している。 Another example of the shape of the hole 32 is the circle of FIGS. 5 and 6. In the illustrated example, the diameter of the circular hole 32 is slightly smaller than the radius of the drain pot 30. In this case as well, the lower edge 33 of the hole 32 is at the level of the water level 23, and the water surface inside the drain pot 30 reaches the lower edge 33 of the hole 32 that communicates the water column pipe 6 and the drain pot 30.

実施の形態２
図２は、本発明の実施の形態２のボイラの水位測定装置２００を示す。このボイラの水位測定装置２００と実施の形態１のボイラの水位測定装置１００とは、水柱管６内の蒸気２０の圧力を差圧式水位発信器９に導く経路である蒸気側導圧管７における水面の位置が大きく異なる。以下、主にこの点ついて説明する。実施の形態１と相違して、蒸気側導圧管７は、水柱管６の内部にまで横向きに挿入されている。４２は、蒸気側導圧管７における、水柱管６の内部への挿入部である。水柱管６の内部における挿入部４２の先端には、上下方向の軸心を有する円筒容器状の先端部４０が設けられている。先端部４０は、挿入部４２に連通されるとともに上向きに開孔している。４３はその開孔部である。蒸気側導圧管７の中の水は先端部４０の開孔部４３の高さにまで満たされている。２３は、その水位であって、差圧式水位発信器９のための基準となる高さに設定されている。 Embodiment 2
FIG. 2 shows the water level measuring device 200 for the boiler according to the second embodiment of the present invention. The water level measuring device 200 of the boiler and the water level measuring device 100 of the boiler of the first embodiment are the water surface in the steam side pressure guiding tube 7 which is a path for guiding the pressure of the steam 20 in the water column pipe 6 to the differential pressure type water level transmitter 9. The position of is very different. This point will be mainly described below. Unlike the first embodiment, the steam side pressure guiding pipe 7 is inserted laterally into the water column pipe 6. Reference numeral 42 denotes an insertion portion of the steam side pressure guiding pipe 7 into the water column pipe 6. A cylindrical container-shaped tip 40 having an axial center in the vertical direction is provided at the tip of the insertion portion 42 inside the water column pipe 6. The tip portion 40 is communicated with the insertion portion 42 and is opened upward. Reference numeral 43 is the opening portion thereof. The water in the steam side pressure guiding tube 7 is filled up to the height of the opening 43 of the tip 40. Reference numeral 23 denotes the water level, which is set to a reference height for the differential pressure type water level transmitter 9.

つぎに、このボイラの水位測定装置２００でのスケールの生成について説明する。図２に示されるボイラの水位測定装置２００では、蒸気側導圧管７の開孔部４３の水面は、その温度条件が、水柱管６の内部の水２１の水面とほぼ同等となる。よって開孔部４３の水面およびその近傍において有害なスケールが発生することが防止される。また図２に示される構成では、蒸気の凝縮が生じる可能性のあるドレンポットを設ける必要が無いため、図１などに示されるものと比べて、よりいっそうスケールの発生を防止することができる。 Next, the generation of the scale in the water level measuring device 200 of this boiler will be described. In the boiler water level measuring device 200 shown in FIG. 2, the temperature condition of the water surface of the opening 43 of the steam side pressure guiding pipe 7 is substantially the same as the water surface of the water 21 inside the water column pipe 6. Therefore, it is possible to prevent harmful scale from being generated on or near the water surface of the opening 43. Further, in the configuration shown in FIG. 2, since it is not necessary to provide a drain pot in which vapor condensation may occur, it is possible to further prevent the generation of scale as compared with the configuration shown in FIG.

蒸気側導圧管７の先端部４０のもう１つの例として、図７のようなストレートタイプが挙げられる。図７に示されるストレートタイプの蒸気側導圧管７は、横向きに水柱管６へ挿入される。挿入された蒸気側導圧管７の先端部４０には蓋５２が取り付けられ、蓋５２の近傍における蒸気側導圧管７の上部には、上向きに開孔する貫通孔５１が設けられている。孔５１の高さに水位２３が形成される。 Another example of the tip 40 of the steam side pressure guiding tube 7 is a straight type as shown in FIG. 7. The straight type steam side pressure guiding pipe 7 shown in FIG. 7 is inserted sideways into the water column pipe 6. A lid 52 is attached to the tip 40 of the inserted steam-side pressure guiding tube 7, and a through hole 51 that opens upward is provided in the upper part of the steam-side pressure guiding tube 7 in the vicinity of the lid 52. A water level 23 is formed at the height of the hole 51.

この図７のストレートタイプでは、図２に示した構成と同様に蒸気側導圧管７は水柱管６の内部で開孔している。よって、図２の場合と同様に、スケールの発生が防止される。しかも、この図７の構成では、蒸気側導圧管７に直接的に貫通孔５１が形成されており、図２に示すような円筒容器状の先端部４０を設ける必要が無いため、その分だけ簡単な構造となる。 In the straight type of FIG. 7, the steam side pressure guiding pipe 7 has a hole inside the water column pipe 6 as in the configuration shown in FIG. Therefore, as in the case of FIG. 2, the generation of scale is prevented. Moreover, in the configuration of FIG. 7, the through hole 51 is directly formed in the steam side pressure guiding tube 7, and it is not necessary to provide the tip portion 40 having a cylindrical container shape as shown in FIG. It has a simple structure.

本発明によれば、図示したもの以外の構成を採用することもできる。すなわち、本発明によれば、たとえば図１に示されるようにドレンポット３０を水柱管６に直付けすることに代えて、スケール発生のおそれの無いごく短い配管で水柱管６とドレンポット３０とを接続する構成や、それ以外の構成を採用することもできる。このような構成も、本発明にいう、水柱管内の蒸気の圧力を差圧式水位発信器に導く経路内の水面の位置を、この経路に導かれる蒸気の凝縮により発生するスケールによってこの経路が塞がれることを防止可能な位置としたものに含まれる。 According to the present invention, configurations other than those shown in the drawings can be adopted. That is, according to the present invention, for example, instead of directly attaching the drain pot 30 to the water column pipe 6 as shown in FIG. 1, the water column pipe 6 and the drain pot 30 are provided with a very short pipe that does not cause scale generation. It is also possible to adopt a configuration for connecting or other configurations. In such a configuration, the position of the water surface in the path for guiding the pressure of steam in the water column pipe to the differential pressure type water level transmitter according to the present invention is blocked by the scale generated by the condensation of the steam guided in this path. It is included in the position where it can be prevented from coming off.

６ 水柱管
７ 蒸気側導圧管
９ 差圧式水位発信器
３０ ドレンポット
２３ 水位
２２ 水位
４０ 先端部 6 Water column pipe 7 Steam side pressure guiding pipe 9 Differential pressure type water level transmitter 30 Drain pot 23 Water level 22 Water level 40 Tip

Claims (3)

ボイラに併設された水柱管内の水位にもとづく圧力と蒸気側の基準水位圧力とを受けて、水柱管内の水位に基づく圧力と基準水位に基づく圧力との圧力差から、差圧式水位発信器によって水柱管内の水位を測定するようにしたボイラの水位測定装置において、
水柱管内の蒸気側の基準水位圧力を差圧式水位発信器に導く経路に水を介在させて、この水の水位を基準水位とし、
前記経路内の水面の位置を、前記経路に導かれる蒸気の凝縮により発生するスケールによって前記経路が塞がれることを防止可能な位置としたことを特徴とするボイラの水位測定装置。 In response to the pressure based on the water level in the water column pipe attached to the boiler and the reference water level pressure on the steam side, the pressure difference between the pressure based on the water level in the water column pipe and the pressure based on the reference water level is determined by the differential pressure type water level transmitter. In the water level measuring device of the boiler that measures the water level in the pipe,
Water is interposed in the path that guides the reference water level pressure on the steam side in the water column pipe to the differential pressure type water level transmitter, and this water level is used as the reference water level.
A boiler water level measuring device, characterized in that the position of the water surface in the path is set so that the path can be prevented from being blocked by a scale generated by the condensation of steam guided to the path. 基準水位を生じさせるための水面を内部に有するドレンポットを水柱管に取り付け、水柱管へのドレンポットの取り付け部には水柱管からドレンポットへの蒸気の流入が可能となる孔が設けられ、前記水面の高さは前記孔の下縁に位置することを特徴とする請求項１記載のボイラの水位測定装置。 A drain pot having a water surface inside to generate a reference water level is attached to the water column pipe, and a hole is provided in the attachment part of the drain pot to the water column pipe to allow steam to flow from the water column pipe to the drain pot. The water level measuring device for a boiler according to claim 1, wherein the height of the water surface is located at the lower edge of the hole. 差圧式水位発信器と水柱管内の蒸気存在部分とを連通させる蒸気側導圧管を有し、前記蒸気側導圧管は、基準水位を生じさせるための水が満たされるとともに、その先端が水柱管内に挿入されて、前記水柱管への挿入部に開孔を有し、前記開孔に前記水の水面が存在することを特徴とする請求項１記載のボイラの水位測定装置。
It has a steam-side pressure guiding tube that communicates the differential pressure type water level transmitter and the steam-existing part in the water column pipe, and the steam-side pressure guiding tube is filled with water for generating a reference water level, and its tip is inside the water column pipe. The water level measuring device for a boiler according to claim 1, wherein the boiler is inserted and has an opening in an insertion portion into the water column pipe, and the water surface of the water is present in the opening.
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Citations (4)

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Publication number Priority date Publication date Assignee Title
JPS58144234U (en) * 1982-03-25 1983-09-28 石川島播磨重工業株式会社 Tank water level gauge zero point drift prevention device
JPH0862375A (en) * 1994-08-24 1996-03-08 Hitachi Ltd Boiling water reactor water gauge
JP2001317982A (en) * 2000-05-02 2001-11-16 Ishikawajima Harima Heavy Ind Co Ltd Drum-level measuring apparatus
JP2013108810A (en) * 2011-11-18 2013-06-06 Toshiba Corp Reactor water level measurement system

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Publication number Priority date Publication date Assignee Title
US4643025A (en) 1985-06-03 1987-02-17 Stone Gerald P System for measuring liquid level in a pressurized vessel

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
JPS58144234U (en) * 1982-03-25 1983-09-28 石川島播磨重工業株式会社 Tank water level gauge zero point drift prevention device
JPH0862375A (en) * 1994-08-24 1996-03-08 Hitachi Ltd Boiling water reactor water gauge
JP2001317982A (en) * 2000-05-02 2001-11-16 Ishikawajima Harima Heavy Ind Co Ltd Drum-level measuring apparatus
JP2013108810A (en) * 2011-11-18 2013-06-06 Toshiba Corp Reactor water level measurement system

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