JPS6331681B2 - - Google Patents
Info
- Publication number
- JPS6331681B2 JPS6331681B2 JP11411978A JP11411978A JPS6331681B2 JP S6331681 B2 JPS6331681 B2 JP S6331681B2 JP 11411978 A JP11411978 A JP 11411978A JP 11411978 A JP11411978 A JP 11411978A JP S6331681 B2 JPS6331681 B2 JP S6331681B2
- Authority
- JP
- Japan
- Prior art keywords
- deaerator
- water supply
- temperature
- boiler
- supply 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.)
- Expired
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 78
- 238000007654 immersion Methods 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 230000002706 hydrostatic effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
Landscapes
- Physical Water Treatments (AREA)
Description
【発明の詳細な説明】
＜産業上の利用分野＞
この発明はボイラ給水系統における加圧加温式
脱気器の出口温度を低下させボイラ給水ポンプの
キヤビテーシヨンを防止する脱気装置に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a deaerator that lowers the outlet temperature of a pressurized and heated deaerator in a boiler water supply system and prevents cavitation of a boiler feed water pump.
＜従来の技術及びその問題点＞
加圧加温式脱気器を備えるボイラ給水系統にお
いては、第１図に示す如く脱気器１に対して加熱
蒸気供給管３により蒸気を供給し、この蒸気によ
り脱気器給水配管２の低温給水を脱気装１内の器
内圧力における飽和温度まで加熱し、この低温給
水に含まれる溶存酸素を除去するようにしてい
る。この方法によると、脱気器１出口のボイラ給
水配管４内の高温給水は脱気器１の器内圧力にお
ける飽和温度を維持しており、このため以下のご
とき問題が生ずる。つまりこの高温給水はボイラ
給水ポンプ５に対して有効吸込み水頭が小さくな
り、ボイラ給水ポンプ５に流入するボイラ給水配
管４での高温給水が乱流となり空洞や気泡の生
成、壊滅というキヤビテーシヨン現象を生ずる。
このためポンプ吸込み側の静水頭を大きくする必
要上脱気器１を高い位置に配置せねばならず、装
置が大型化、複雑化して不経済であつた。このた
め第２図に示す様にボイラ給水配管４内の高温給
水温度を低下させる装置が提案された（特公昭38
−10255号）。この装置はボイラ給水配管４に熱交
換器７を設け、ボイラ給水配管４内の高温給水を
脱気器給水配管２の低温給水により降温させ、ボ
イラ給水ポンプ５のキヤビテーシヨンを防止する
と共に、節炭器６における熱交換の際、ガスと高
温給水の温度差を大きくして熱交換量を多くする
ことができる。しかし、熱交換器７を特別に設置
しなければならず不経済であり、加えてボイラ給
水流れに対し抵抗を与えることとなり圧力降下に
よりボイラ給水ポンプ５の吸込口の給水圧力を低
下させる結果となり、折角ボイラ給水の温度を低
いものとしても依然としてキヤビテーシヨンの機
会をもつこととなり、かつ装置の複雑化は避けら
れなかつた。<Prior art and its problems> In a boiler water supply system equipped with a pressurized and heated deaerator, steam is supplied to the deaerator 1 through a heated steam supply pipe 3, as shown in FIG. The low-temperature feed water in the deaerator water supply pipe 2 is heated by steam to the saturation temperature at the internal pressure in the deaerator 1, and dissolved oxygen contained in this low-temperature feed water is removed. According to this method, the high temperature feed water in the boiler water supply pipe 4 at the outlet of the deaerator 1 maintains the saturation temperature at the internal pressure of the deaerator 1, which causes the following problems. In other words, this high-temperature feed water has a smaller effective suction head with respect to the boiler feed water pump 5, and the high-temperature feed water in the boiler feed water pipe 4 flowing into the boiler feed water pump 5 becomes turbulent, causing a cavitation phenomenon in which cavities and bubbles are formed and destroyed. .
For this reason, it is necessary to increase the hydrostatic head on the suction side of the pump, and the deaerator 1 must be placed at a high position, making the device larger and more complicated, making it uneconomical. For this reason, a device was proposed to lower the temperature of the high-temperature water supply in the boiler water supply pipe 4, as shown in Figure 2.
−10255). This device is equipped with a heat exchanger 7 in the boiler water supply pipe 4, lowers the temperature of the high temperature water supply in the boiler water supply pipe 4 by the low temperature water supply in the deaerator water supply pipe 2, prevents cavitation of the boiler water supply pump 5, and saves energy. During heat exchange in the vessel 6, the amount of heat exchange can be increased by increasing the temperature difference between the gas and the high-temperature feed water. However, the heat exchanger 7 must be specially installed, which is uneconomical, and in addition, it provides resistance to the flow of boiler feed water, resulting in a pressure drop that lowers the water supply pressure at the suction port of the boiler feed water pump 5. Even if the temperature of the boiler feed water was lowered, cavitation still occurred, and the complexity of the equipment was unavoidable.
＜発明の目的＞
この発明は上記した従来技術の欠点をなくし簡
単な手段により良好に脱気器出口給水を降温させ
るボイラ給水ポンプのキヤブテーシヨンを防止す
ることのできる脱気装置を提供することにある。<Object of the Invention> The object of the present invention is to provide a deaerator which eliminates the drawbacks of the above-mentioned prior art and can effectively lower the temperature of the deaerator outlet feed water by a simple means and prevent cavitation of a boiler feed water pump. .
＜手段の概要＞
要するにこの発明は脱気器の水部内に脱気器給
水配管の一部を浸漬し、この浸漬部から上流の脱
気器給水配管より分岐し、脱気器とボイラ給水ポ
ンプとを接続するボイラ給水配管に、接続するバ
イパス管を設けたものである。<Summary of Means> In short, this invention immerses a part of the deaerator water supply pipe in the water part of the deaerator, branches from the deaerator water supply pipe upstream from this immersion part, and connects the deaerator and the boiler water supply pump. A bypass pipe is provided to connect the boiler water supply pipe to the boiler water supply pipe.
＜実施例 １＞
以下この発明の一実施例を図面を用いて説明す
る。<Example 1> An example of the present invention will be described below with reference to the drawings.
第３図において、バイパス管９ないし、又はバ
イパス管に設けた弁（図示せず）を閉にしたとき
（浸漬部を設けたことにつき）の効果を考察して
みると、脱気器給水配管２内の低温給水は脱気器
１の貯槽部に供給される前に熱交換用の伝熱管８
内に導入され貯槽部の高温給水と熱交換を行なつ
た後脱気器１に導入される。このためボイラ給水
配管４に流入する高温給水は伝熱管８内の低温給
水との熱交換によつて脱気器１の器内圧力におけ
る飽和温度以下となつており、ボイラ給水ポンプ
５においてキヤビテーシヨンが生ずることはな
い。ボイラ給水ポンプ５を出た高温給水は節炭器
６に至り、この節炭器６を通過するガスにより熱
交換される。 In Fig. 3, when considering the effect when the bypass pipe 9 or the valve (not shown) provided on the bypass pipe is closed (due to the provision of the immersion section), the deaerator water supply pipe The low-temperature feed water in 2 is passed through a heat exchanger tube 8 for heat exchange before being supplied to the storage tank of the deaerator 1.
The water is introduced into the deaerator 1 after exchanging heat with the high-temperature water supply in the storage tank. Therefore, the high temperature feed water flowing into the boiler feed water pipe 4 becomes below the saturation temperature at the internal pressure of the deaerator 1 through heat exchange with the low temperature feed water in the heat transfer tube 8, and cavitation occurs in the boiler feed water pump 5. It will never occur. The high-temperature feed water leaving the boiler feed water pump 5 reaches the economizer 6, where it is heat exchanged by the gas passing through the economizer 6.
前記した場合ボイラ給水配管４の圧力降下△Ｐ
を小さくすることができ、脱気器１に導入する低
温給水は脱気器１内の高温給水との熱交換により
エントロピが大となつており、その分だけ加熱蒸
気供給配管３から供給する蒸気量を減ずることが
できる。さらに節炭器６においては、高温給水と
ガスの温度差が大となり熱交換量が大きくなつて
いるため伝熱面積を減ずることができる。 In the above case, the pressure drop in boiler water supply pipe 4 △P
The entropy of the low-temperature feed water introduced into the deaerator 1 increases due to heat exchange with the high-temperature feed water in the deaerator 1, and the steam supplied from the heated steam supply pipe 3 increases accordingly. The amount can be reduced. Furthermore, in the economizer 6, the temperature difference between the high-temperature supply water and the gas is large, and the amount of heat exchange is large, so that the heat transfer area can be reduced.
ちなみに以下の条件でこの実施例と従来方法と
を比較すると、
(1) 脱気器１の入口給水温度……20℃
(2) 脱気器１の器内圧力……1.5ata
(3) 節炭器６の入口ガス温度……350℃
(4) 節炭器６の出口ガス温度……200℃
において、節炭器６の入口給水温度を80℃とした
場合、この実施例によればボイラ給水ポンプ５に
対する有効吸込み水頭は約10mH2O増大し、脱気
器１の位置を約10m低くすることができる。さら
に脱気器１における蒸気消費量については約35％
減少し、さらに節炭器６において廃棄される排ガ
スの損失は約５％減少する。 By the way, when comparing this example and the conventional method under the following conditions, (1) Inlet water supply temperature of deaerator 1...20℃ (2) Internal pressure of deaerator 1...1.5ata (3) Section According to this embodiment, when the inlet gas temperature of the coal economizer 6 is 350°C (4) The outlet gas temperature of the coal economizer 6 is 200°C, and the inlet water supply temperature of the coal economizer 6 is 80°C, the boiler The effective suction head for the water pump 5 increases by about 10 mH 2 O, and the position of the deaerator 1 can be lowered by about 10 m. Furthermore, the steam consumption in deaerator 1 is approximately 35%.
Furthermore, the loss of exhaust gas disposed of in the economizer 6 is reduced by about 5%.
＜実施例 ２＞
前記はバイパス管９を使用しないときだが、第
３図において、バイパス管を使用し脱気器給水配
管２の低温給水の大部分は伝熱管８に供給して脱
気器１内の高温給水と熱交換させるが、脱気器給
水配管２の低温給水の一部をバイパス管９よりボ
イラ給水配管４の高温給水へ直接導入することが
できる。<Example 2> Although the above is a case in which the bypass pipe 9 is not used, in FIG. A portion of the low temperature feed water in the deaerator water supply pipe 2 can be directly introduced into the high temperature feed water in the boiler water supply pipe 4 through the bypass pipe 9.
この場合バイパス管９には弁（図示せず）を設
け、流入量を調節する必要がある。 In this case, it is necessary to provide a valve (not shown) in the bypass pipe 9 to adjust the inflow amount.
この様に、脱気器給水配管２の低温給水をバイ
パス管９から直接ボイラ給水配管４の高温給水中
に導入するようにしたので、ボイラ給水配管４の
圧力損失を小さくすることができ、高温給水をよ
り冷却することができる。 In this way, the low-temperature feed water of the deaerator water supply pipe 2 is directly introduced into the high-temperature water supply of the boiler water supply pipe 4 from the bypass pipe 9, so the pressure loss in the boiler water supply pipe 4 can be reduced, and the high temperature The water supply can be further cooled.
＜発明の効果＞
この発明を実施することによりボイラ給水配管
内の圧力降下を小さくしボイラ給水ポンプ吸込側
の静水頭を大きくすることができるため脱気器を
低い位置に配置でき脱気器支持架台等の資材費を
低減でき、かつ装置を小型化することができる。<Effects of the Invention> By carrying out this invention, it is possible to reduce the pressure drop in the boiler water supply piping and increase the hydrostatic head on the suction side of the boiler feed water pump, so the deaerator can be placed at a lower position and the deaerator can be supported. The cost of materials such as frames can be reduced, and the device can be downsized.
また節炭器におけるガスと給水との温度差が大
きくなるため熱交換量が大となり節炭器の伝熱面
積を小さく押えることができる。 Furthermore, since the temperature difference between the gas and the water supply in the economizer increases, the amount of heat exchange increases, and the heat transfer area of the economizer can be kept small.
さらに脱気器に導入する給水のエントロピが大
となるため、その分だけ脱気器に導入すべき加熱
蒸気供給配管からの蒸気量を減少させることがで
きる等種々の効果を発揮する。 Furthermore, since the entropy of the feed water introduced into the deaerator increases, various effects such as being able to reduce the amount of steam from the heated steam supply pipe to be introduced into the deaerator by that amount are exhibited.
第１図は従来の脱気装置を示す給水系統図、第
２図は別の方式による従来型脱気装置の給水系統
図、第３図はこの発明の一実施例を示す脱気装置
の給水系統図である。
１……加圧加温式脱気器、２……脱気器給水配
管、３……加熱蒸気配管、４……ボイラ給水配
管、５……ボイラ給水ポンプ、６……節炭器、８
……伝熱管、９……バイパス管。
Fig. 1 is a water supply system diagram showing a conventional deaerator, Fig. 2 is a water supply system diagram of a conventional deaerator using a different method, and Fig. 3 is a water supply system diagram of a deaerator showing an embodiment of the present invention. It is a system diagram. 1... Pressurized heating deaerator, 2... Deaerator water supply piping, 3... Heating steam piping, 4... Boiler water supply piping, 5... Boiler water supply pump, 6... Energy saver, 8
...Heat transfer tube, 9...Bypass pipe.
Claims (1)
ボイラ給水配管を接続し、脱気器内の給水を加熱
蒸気供給管からの加熱蒸気で脱気するものにおい
て、前記脱気器の水部内に脱気器給水配管の一部
を浸漬し、この浸漬部より上流の脱気器給水配管
から分岐し、脱気器とボイラ給水ポンプとを接続
するボイラ給水配管に、接続するバイパス管を設
けたことを特徴とする脱気装置。1 In a device in which a deaerator water supply pipe, a heated steam supply pipe, and a boiler water supply pipe are connected to a deaerator, and the water supply in the deaerator is deaerated with heated steam from the heated steam supply pipe, the deaerator is A part of the deaerator water supply pipe is immersed in the water part, and a bypass pipe is branched from the deaerator water supply pipe upstream from this immersion part and connected to the boiler water supply pipe that connects the deaerator and the boiler water supply pump. A deaeration device characterized by being provided with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11411978A JPS5541349A (en) | 1978-09-19 | 1978-09-19 | Method of lowering temperature of feed water for deaerator outlet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11411978A JPS5541349A (en) | 1978-09-19 | 1978-09-19 | Method of lowering temperature of feed water for deaerator outlet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5541349A JPS5541349A (en) | 1980-03-24 |
| JPS6331681B2 true JPS6331681B2 (en) | 1988-06-24 |
Family
ID=14629606
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11411978A Granted JPS5541349A (en) | 1978-09-19 | 1978-09-19 | Method of lowering temperature of feed water for deaerator outlet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5541349A (en) |
-
1978
- 1978-09-19 JP JP11411978A patent/JPS5541349A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5541349A (en) | 1980-03-24 |
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