JPS631490B2 - - Google Patents

Info

Publication number
JPS631490B2
JPS631490B2 JP1975482A JP1975482A JPS631490B2 JP S631490 B2 JPS631490 B2 JP S631490B2 JP 1975482 A JP1975482 A JP 1975482A JP 1975482 A JP1975482 A JP 1975482A JP S631490 B2 JPS631490 B2 JP S631490B2
Authority
JP
Japan
Prior art keywords
liquid
liquid supply
pump
ejector
supply pump
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.)
Expired
Application number
JP1975482A
Other languages
Japanese (ja)
Other versions
JPS58138904A (en
Inventor
Mitsutake Sasaki
Masatoshi Shimakita
Shinya Takeno
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP1975482A priority Critical patent/JPS58138904A/en
Publication of JPS58138904A publication Critical patent/JPS58138904A/en
Publication of JPS631490B2 publication Critical patent/JPS631490B2/ja
Granted legal-status Critical Current

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  • Jet Pumps And Other Pumps (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)

Description

【発明の詳細な説明】 本発明は、ボイラ給水装置、低温熱源利用発電
プラント等の給液装置の改良に関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in liquid supply systems for boiler water supply systems, power plants using low-temperature heat sources, and the like.

第1図は、従来の給液装置の一例の系統線図を
示すが、同図において、01は給液ポンプで、同
給液ポンプ01は、ホツトウエルタンク02内の
熱媒体(液)03を吸込み、昇圧して、これを蒸
発器04内へ送り込むようになつており、該熱媒
体液03は該蒸発器04内で熱源04aで蒸発さ
せられるようになつている。該熱源04aとして
は、熱水や地熱蒸気等が用いられる。05は蒸気
タービンで、同タービン05は上記蒸発器04で
発生した蒸気で回転し、給液ポンプ01及び発電
機07を駆動するようになつており、その起動時
には、電動機として作動し、給液ポンプ01を駆
動する。08は上記タービン05内で膨張した熱
媒体蒸気を、冷却水09で冷却して凝縮させる凝
縮器で、凝縮した熱媒体をホツトウエルタンク0
2内に戻すようになつている。
FIG. 1 shows a system diagram of an example of a conventional liquid supply device. In the figure, 01 is a liquid supply pump, and the liquid supply pump 01 is a heating medium (liquid) 03 in a hotwell tank 02. The heat transfer liquid 03 is evaporated in the evaporator 04 by a heat source 04a. As the heat source 04a, hot water, geothermal steam, etc. are used. Reference numeral 05 denotes a steam turbine. The turbine 05 is rotated by the steam generated in the evaporator 04, and drives the liquid supply pump 01 and the generator 07. When started, it operates as an electric motor, and the turbine 05 operates as an electric motor to generate the liquid supply. Drive pump 01. 08 is a condenser that cools and condenses the heat medium vapor expanded in the turbine 05 with cooling water 09, and the condensed heat medium is transferred to the Hotwell tank 0.
It is expected to return to within 2.

上記従来の給液装置では、給液ポンプ01が熱
媒体液03の圧力を上げて蒸発器04に供給し、
該蒸発器04内では、該熱媒体液03は、熱源0
4aから熱を受けて蒸気となり、タービン05に
流入して、これを駆動するようになつており、該
タービン05は給液ポンプ01及び発電機07を
駆動するようになつている。従つてタービン05
の出力の一部が、給液ポンプ01の駆動に消費さ
れ、残りの出力が発電に利用される。また、ター
ビン05内で膨張した蒸気は、凝縮器08内に流
入し、冷却水09で冷却されて凝縮して液体とな
り、ホツトウエルタンク02に入り、再び給液ポ
ンプ01へと吸込まれる。このようにして、ホツ
トウエルタンク02の熱媒体液03は、系内を循
環し、蒸発器04の熱源04aから受取つた熱エ
ネルギを、タービン05及び発電機07によつて
電気エネルギに変換する作用を行う。
In the conventional liquid supply device, the liquid supply pump 01 increases the pressure of the heat transfer liquid 03 and supplies it to the evaporator 04,
In the evaporator 04, the heat transfer liquid 03 is heated to a heat source 0.
It receives heat from 4a and becomes steam, which flows into a turbine 05 and drives it, and the turbine 05 drives a liquid supply pump 01 and a generator 07. Therefore turbine 05
A part of the output is consumed to drive the liquid supply pump 01, and the remaining output is used for power generation. Further, the steam expanded in the turbine 05 flows into the condenser 08, is cooled by the cooling water 09, condenses, becomes liquid, enters the hotwell tank 02, and is sucked into the liquid supply pump 01 again. In this way, the heat transfer liquid 03 in the Hotwell tank 02 circulates within the system, and has the effect of converting the thermal energy received from the heat source 04a of the evaporator 04 into electrical energy by the turbine 05 and the generator 07. I do.

ポンプがキヤビテーシヨンを発生することなく
正常に動作するためには、ある一定値よりも高い
ポンプ入口圧を確保する必要があるが、そのため
には、ポンプのホツトウエルタンク液面との関係
位置を下げなければならない。しかしこの対策
が、プラント構造のコンパクト化、コスト低減等
の要請から不可能な場合には、ポンプの正常な作
動を期待できず、キヤビテーシヨンの発生が避け
られないという問題点があつた。
In order for the pump to operate normally without cavitation, it is necessary to secure a pump inlet pressure higher than a certain value. There must be. However, if this measure is not possible due to demands such as downsizing of the plant structure and cost reduction, there is a problem that normal operation of the pump cannot be expected and the occurrence of cavitation is unavoidable.

本発明は、上記従来装置の問題点を解消し、上
記のような対策が不可能な場合でも、キヤビテー
シヨン発生のおそれがなく、正常作動の可能な給
液ポンプを具えた給液装置を提供することを目的
として提案されたもので、断熱用隔壁によつて2
つの室に区画され、該隔壁の上端縁部を越えて液
が流通するように構成されたホツトウエルタンク
と、同ホツトウエルタンクの一方の室に配設され
た冷却装置と、同冷却装置を有する室の側壁に一
端を接続され、他端をエジエクタ本体に接続され
た吸込管と、該エジエクタ本体に吸込口を接続さ
れた給液ポンプと、同ポンプの吐出管から分岐さ
れ、先端に取付けられ上記エジエクタ本体に挿入
されたエジエクタノズルをもつ分岐管と、上記吸
込管及びエジエクタ本体を冷却する冷却装置とを
具備してなることを特徴とする給液装置に係るも
のである。
The present invention solves the problems of the conventional device described above, and provides a liquid supply device equipped with a liquid supply pump that can operate normally without the risk of cavitation even when the above-mentioned countermeasures are impossible. This was proposed for the purpose of
A hotwell tank is divided into two chambers and configured so that liquid flows beyond the upper end edge of the partition wall, a cooling device disposed in one chamber of the hotwell tank, and a cooling device arranged in one chamber of the hotwell tank. a suction pipe whose one end is connected to the side wall of the chamber and whose other end is connected to the ejector body, a liquid supply pump whose suction port is connected to the ejector body, and which is branched from the discharge pipe of the pump and attached to the tip. The present invention relates to a liquid supply device characterized by comprising: a branch pipe having an ejector nozzle inserted into the ejector main body; and a cooling device for cooling the suction pipe and the ejector main body.

以下、第2図及び第3図に示す実施例により、
本発明につき具体的に説明する。
Hereinafter, according to the embodiment shown in FIGS. 2 and 3,
The present invention will be specifically explained.

第2図において、1は給液ポンプ、2は該給液
ポンプ1に熱媒体液3を供給するホツトウエルタ
ンクで、ポンプ1の該ホツトウエルタンク2の液
面との関係位置は従来装置と同様である。4は該
ホツトウエルタンク2内を、2つの室A,Bに区
画する隔壁で、同隔壁4はホツトウエルタンク2
の底面のほぼ中央部に立設されており、その上端
縁部4aは、ホツトウエルタンク2内の熱媒体液
3の液面6下に没するように、該隔壁4の高さが
設定されていて、両室A,Bの上部では、熱媒体
液3が流通可能となつている。なお、該隔壁4
は、室A,B内の液3の間の熱の授受を遮断する
役割をもつ。5は上記室Bの側壁適所に一端を接
続された吸込管、7は該室B内の熱媒体液3の冷
却装置、8は給液ポンプ1の吸込口側に設置され
たエジエクタ本体、9は給液ポンプ1の吐出管、
10は該吐出管9から分岐された分岐管、11は
該分岐管10の先端に装着されたエジエクタノズ
ルで、同ノズル11は第3図に示すようにエジエ
クタ本体8に流体密に挿入されていて、該エジエ
クタ本体8とともにエジエクタを形成している。
12は該エジエクタ及び上記吸込管5の外周に巻
付けられ、それら部材を外部から冷却する冷却装
置、13は上記分岐管10に介装された開閉弁
で、同開閉弁13の操作により、給液ポンプ1の
ポンプ入口圧を調節できるようになつている。1
4は上記室B内の熱媒体液3の温度検出用の温度
計である。
In FIG. 2, 1 is a liquid supply pump, and 2 is a hotwell tank that supplies heat medium liquid 3 to the liquid supply pump 1. The position of the pump 1 in relation to the liquid level of the hotwell tank 2 is different from that of the conventional device. The same is true. Reference numeral 4 denotes a partition wall that divides the inside of the Hotwell tank 2 into two chambers A and B;
The height of the partition wall 4 is set such that its upper edge 4a is submerged below the liquid level 6 of the heat transfer liquid 3 in the Hotwell tank 2. The heat transfer liquid 3 can flow through the upper portions of both chambers A and B. Note that the partition wall 4
has the role of blocking heat transfer between the liquids 3 in chambers A and B. 5 is a suction pipe whose one end is connected to a suitable position on the side wall of the chamber B; 7 is a cooling device for the heat medium liquid 3 in the chamber B; 8 is an ejector body installed on the suction port side of the liquid supply pump 1; 9 is the discharge pipe of the liquid supply pump 1,
10 is a branch pipe branched from the discharge pipe 9, 11 is an ejector nozzle attached to the tip of the branch pipe 10, and the nozzle 11 is fluid-tightly inserted into the ejector main body 8 as shown in FIG. , forms an ejector together with the ejector main body 8.
12 is a cooling device that is wound around the outer periphery of the ejector and the suction pipe 5 and cools these members from the outside; 13 is an on-off valve installed in the branch pipe 10; The pump inlet pressure of the liquid pump 1 can be adjusted. 1
4 is a thermometer for detecting the temperature of the heat medium liquid 3 in the chamber B.

なお、図示はしていないが、ホツトウエルタン
ク2の一方の室Aには、タービンを駆動ずみの蒸
気を凝縮器で凝縮した液が、従来装置同様に供給
される。
Although not shown in the drawings, one chamber A of the Hotwell tank 2 is supplied with liquid obtained by condensing the steam that drives the turbine in a condenser, as in the conventional apparatus.

本発明装置の一実施例は、上記のように構成さ
れており、本装置の運転を開始するに当つては、
給液ポンプ1を起動する前に、まず、冷却装置
7,12h、ホツトウエルタンク2内の熱媒体液
3の液温より低温の冷却水を流し、室B、吸込管
5及びエジエクタ本体8内の液を冷却する。そし
て、該液の温度が所定の温度以下に達した時点
で、開閉弁13を開いて、給液ポンプを起動す
る。そして、給液ポンプ1が所定の回転数に達し
たとき、冷却装置7,12への冷却水の供給を停
止し、ポンプ入口圧を開閉弁13の操作で調節す
る。
One embodiment of the device of the present invention is configured as described above, and when starting the operation of the device,
Before starting the liquid supply pump 1, first, cooling water whose temperature is lower than that of the heat transfer liquid 3 in the cooling device 7, 12h and the Hotwell tank 2 is supplied to the chamber B, the suction pipe 5, and the ejector body 8. Cool the liquid. Then, when the temperature of the liquid reaches a predetermined temperature or lower, the on-off valve 13 is opened and the liquid supply pump is started. When the liquid supply pump 1 reaches a predetermined rotational speed, the supply of cooling water to the cooling devices 7 and 12 is stopped, and the pump inlet pressure is adjusted by operating the on-off valve 13.

一般に、ポンプのキヤビテーシヨンが発生しな
い最小限の正吸込水頭(NPSH)を要求NPSH
と言い、キヤビテーシヨンが発生しないために
は、次の1式を満足しなければならない。
Generally requires a minimum positive suction head (NPSH) without cavitation of the pump.NPSH
In order to prevent cavitation from occurring, the following equation must be satisfied.

Pt−Pv/γ>要求NPSH …(1) ここで Pt:ポンプ入口の全圧(Kg/cm2) Pv:液の蒸気圧(Kg/cm2) γ:液の比重量(Kg/cm3) 上記(1)式のPv、γは液の温度の関数として得
られるので、ポンプ起動前に、温度計14で室B
内の液温を測り、該(1)式に当てはめ、これが該(1)
式を満足しない場合には、上述の冷却装置7,1
2の冷却操作によつて液の蒸気圧Pvを減少させ
れば、(1)式を満足できるので、キヤビテーシヨン
の発生なしに、給液ポンプ1を起動できる。給液
ポンプ1が起動すれば、吐出管9内を流れる吐出
液の一部が分岐管10を通り、先端のエジエクタ
ノズル11で加速されてエジエクタ本体8内に噴
出する。この噴流と吸込管5内の液の流れとが、
エジエクタ本体8内で混合し、圧力上昇を伴なつ
てエジエクタ本体8から、給液ポンプ1に向つて
流出するので、ポンプ入口圧が上昇する。従つ
て、冷却前の蒸気圧であつても、上記(1)式を満足
するようになつたら、冷却装置7,12への冷却
水の供給を停止する。それ以後は、エジエクタが
作動する限り、給液ポンプ1は、キヤビテーシヨ
ンを発生することなく、定常な作動を続ける。
Pt−Pv/γ>Required NPSH…(1) Where, Pt: Total pressure at pump inlet (Kg/cm 2 ) Pv: Vapor pressure of liquid (Kg/cm 2 ) γ: Specific weight of liquid (Kg/cm 3 ) Pv and γ in equation (1) above can be obtained as a function of the temperature of the liquid, so before starting the pump, check the temperature of chamber B with the thermometer 14.
Measure the temperature of the liquid inside and apply it to the formula (1), and this is the formula (1).
If the formula is not satisfied, the above-mentioned cooling device 7, 1
If the vapor pressure Pv of the liquid is reduced by the cooling operation in step 2, equation (1) can be satisfied, so the liquid supply pump 1 can be started without cavitation. When the liquid supply pump 1 is started, a part of the discharge liquid flowing in the discharge pipe 9 passes through the branch pipe 10, is accelerated by the ejector nozzle 11 at the tip, and is ejected into the ejector body 8. This jet flow and the flow of liquid in the suction pipe 5 are
The liquid is mixed within the ejector main body 8 and flows out from the ejector main body 8 toward the liquid supply pump 1 with an increase in pressure, so that the pump inlet pressure increases. Therefore, even if the vapor pressure is before cooling, when the above equation (1) is satisfied, the supply of cooling water to the cooling devices 7 and 12 is stopped. After that, as long as the ejector operates, the liquid supply pump 1 continues to operate steadily without cavitation.

本発明装置は、上記のような構成、作用を具有
するものであるから、本発明によれば、 (1) 給液ポンプ1の起動に必要な液の温度を、所
定の温度以下に冷却できるため、キヤビテーシ
ヨンの発生なしに給液ポンプを起動できる。
Since the device of the present invention has the above-described configuration and operation, according to the present invention, (1) the temperature of the liquid required for starting the liquid supply pump 1 can be cooled to a predetermined temperature or less; Therefore, the liquid supply pump can be started without cavitation.

(2) ポンプ入口圧が、一旦上昇してしまえば、液
の冷却をしなくとも、キヤビテーシヨンの発生
なしに、給液ポンプの定常運転を継続できる。
(2) Once the pump inlet pressure has increased, steady operation of the liquid supply pump can be continued without cavitation without cooling the liquid.

(3) 冷却装置7で冷却する室Bの内外の液の間の
熱の授受を、隔壁4によつて遮断し、冷却装置
7の冷却効果を高めることができる。
(3) Transfer of heat between the liquid inside and outside the chamber B cooled by the cooling device 7 can be blocked by the partition wall 4, and the cooling effect of the cooling device 7 can be enhanced.

などの実用的効果を挙げることができる。The following practical effects can be mentioned.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は従来装置の略示的系統線図、第2図及
び第3図は、本発明の一実施例の概略説明図で、
第2図は要部の縦断面図、第3図は第2図のX部
拡大図である。 第2図、第3図において、1:給液ポンプ、
2:ホツトウエルタンク、3:熱媒体液、4:隔
壁、5:吸込管、6:液面、7:冷却装置、8:
エジエクタ、9:吐出管、10:分岐管、11:
エジエクタノズル、12:冷却装置、13:開閉
弁、14:温度計。
FIG. 1 is a schematic system diagram of a conventional device, and FIGS. 2 and 3 are schematic explanatory diagrams of an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of the main part, and FIG. 3 is an enlarged view of the X section in FIG. In Figures 2 and 3, 1: liquid supply pump;
2: Hotwell tank, 3: Heat medium liquid, 4: Partition wall, 5: Suction pipe, 6: Liquid level, 7: Cooling device, 8:
Ejector, 9: Discharge pipe, 10: Branch pipe, 11:
Ejector nozzle, 12: cooling device, 13: on-off valve, 14: thermometer.

Claims (1)

【特許請求の範囲】[Claims] 1 断熱用隔壁によつて2つの室に区画され、該
隔壁の上端縁部を越えて液が流通するように構成
されたホツトウエルタンクと、同ホツトウエルタ
ンクの一方の室に配設された冷却装置と、同冷却
装置を有する室の側壁に一端を接続され、他端を
エジエクタ本体に接続された吸込管と、該エジエ
クタ本体に吸込口を接続された給液ポンプと、同
ポンプの吐出管から分岐され、先端に取付けられ
上記エジエクタ本体に挿入されたエジエクタノズ
ルをもつ分岐管と、上記吸込管及びエジエクタ本
体を冷却する冷却装置とを具備してなることを特
徴とする給液装置。
1. A hot-well tank that is divided into two chambers by a heat-insulating bulkhead and configured so that the liquid flows beyond the upper edge of the bulkhead, and a hot-well tank that is arranged in one chamber of the hot-well tank. A cooling device, a suction pipe connected at one end to a side wall of a chamber containing the cooling device and the other end connected to an ejector body, a liquid supply pump having a suction port connected to the ejector body, and a discharge of the pump. A liquid supply device comprising: a branch pipe having an ejector nozzle branched from the pipe, attached to its tip and inserted into the ejector body; and a cooling device for cooling the suction pipe and the ejector body.
JP1975482A 1982-02-12 1982-02-12 Liquid feeder Granted JPS58138904A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1975482A JPS58138904A (en) 1982-02-12 1982-02-12 Liquid feeder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1975482A JPS58138904A (en) 1982-02-12 1982-02-12 Liquid feeder

Publications (2)

Publication Number Publication Date
JPS58138904A JPS58138904A (en) 1983-08-18
JPS631490B2 true JPS631490B2 (en) 1988-01-13

Family

ID=12008127

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1975482A Granted JPS58138904A (en) 1982-02-12 1982-02-12 Liquid feeder

Country Status (1)

Country Link
JP (1) JPS58138904A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0369446U (en) * 1989-11-13 1991-07-10

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0369446U (en) * 1989-11-13 1991-07-10

Also Published As

Publication number Publication date
JPS58138904A (en) 1983-08-18

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