JPS6249126B2 - - Google Patents
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- Publication number
- JPS6249126B2 JPS6249126B2 JP57166332A JP16633282A JPS6249126B2 JP S6249126 B2 JPS6249126 B2 JP S6249126B2 JP 57166332 A JP57166332 A JP 57166332A JP 16633282 A JP16633282 A JP 16633282A JP S6249126 B2 JPS6249126 B2 JP S6249126B2
- Authority
- JP
- Japan
- Prior art keywords
- water supply
- pressure
- water
- temperature
- 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
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- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Description
【発明の詳細な説明】
本発明は冷却水流量調整方法に係り、特に複数
の冷却器を有する冷却給水系の給水ポンプの消費
動力を低減できる方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling water flow rate adjustment method, and more particularly to a method for reducing the power consumption of a water supply pump in a cooling water supply system having a plurality of coolers.
一般に製造工場においては莫大な量の冷却水が
使用されている。従来の冷却給水系統の１例とし
て第１図の製鉄圧延工場について説明する。給水
槽２の水は給水ポンプ４により昇圧され、給水管
６を経て、自動水量調節弁８あるいは手動水量調
節弁１０で調節され冷却器１２に給水され、戻水
管１４、冷却塔１６を経て循環している。 Generally, a huge amount of cooling water is used in a manufacturing factory. As an example of a conventional cooling water supply system, a steel rolling mill shown in FIG. 1 will be described. The water in the water tank 2 is pressurized by the water pump 4, passes through the water supply pipe 6, is regulated by the automatic water flow control valve 8 or manual water flow control valve 10, is supplied to the cooler 12, and is circulated through the return pipe 14 and the cooling tower 16. are doing.
このような冷却給水系統において、従来次のよ
うな問題点があつた。 Conventionally, such cooling water supply systems have had the following problems.
(イ) 給水量が減少すると不必要にポンプ出口の圧
力が上昇し、エネルギーの無駄を生じる。後記
第６図のポンプ特性図に示される如く、給水量
の減少によつて給水圧が上昇し、給水量当りの
電力費が増加する。(b) When the amount of water supplied decreases, the pressure at the pump outlet increases unnecessarily, resulting in wasted energy. As shown in the pump characteristic diagram of FIG. 6, which will be described later, as the amount of water supplied increases, the water supply pressure increases, and the electric power cost per amount of water supplied increases.
(ロ) 給水温度が低下すると、必要とする給水量は
減少する。冷却水給水装置の給水量と給水圧の
設計は夏季の最も高くなる給水温度をもとにし
てなされているので、夏季以外の季節において
は、給水温度が低いため、真に必要な給水量は
この設計値よりも少なくなり、また真に必要な
給水圧力も給水量の減少に伴つて低くなる。従
つて夏季以外においてはポンプ出口の圧力が不
必要に上昇する傾向がある。(b) When the water supply temperature decreases, the required amount of water supply decreases. The water supply amount and water pressure of the cooling water supply system are designed based on the highest water supply temperature in summer, so in seasons other than summer, the water supply temperature is low, so the truly necessary water supply amount is This is less than the design value, and the truly necessary water supply pressure also decreases as the water supply amount decreases. Therefore, the pressure at the pump outlet tends to increase unnecessarily during seasons other than summer.
一般に製鉄所には溶鉱炉、転炉をはじめ各種加
熱炉が多数あり、これらの装置を熱から保護する
ための第１図の如き冷却給水系統が装置毎に設け
てある。 Generally, a steelworks has a large number of various types of heating furnaces including blast furnaces and converters, and each of these devices is provided with a cooling water supply system as shown in FIG. 1 to protect these devices from heat.
各装置には冷却用配管とバルブが取付けられて
いるが、バルブの数が無数にあるため、温度変化
による細かい水量調整ができず、年間を通して一
定のバルブ開度で冷却水を使用していることが多
い。 Each device is equipped with cooling piping and valves, but because there are an infinite number of valves, it is not possible to finely adjust the amount of water due to temperature changes, and cooling water is used at a constant valve opening throughout the year. There are many things.
また設備によつては流量調節弁を設けて流量を
調節したりあるいは人手によりバルブを開閉して
流量を調節しているが、工場全体をみると冷却給
水系統の流量管理はできているとは言えない。 In addition, depending on the equipment, the flow rate is adjusted by installing a flow control valve, or by opening and closing the valve manually, but if you look at the factory as a whole, it is difficult to control the flow rate of the cooling water supply system. I can not say.
本発明の目的は上記従来技術の問題点を解決
し、給水温度によつて自動的に流量を調整し給水
ポンプの消費動力を低減できる冷却水流量調整方
法を提供するにある。 SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art described above and to provide a cooling water flow rate adjustment method that can automatically adjust the flow rate depending on the temperature of the water supply and reduce the power consumption of the water supply pump.
本発明の要旨とするところは次のとおりであ
る。すなわち、複数の冷却器を有する冷却給水系
の供給する冷却水温に適した流量調整方法におい
て、給水ポンプ吐出側に設けられた水温検知器と
水圧検知器にて給水する温度と圧力を検知する段
階と、前記検知した給水温度信号を圧力決定演算
器に受け前記給水温度に適した給水圧力を演算す
る段階と、前記検知した給水圧力信号と前記演算
給水圧力信号を圧力制御器に受け両者の圧力偏差
を算出する段階と、前記圧力偏差信号を回転数制
御装置に受け前記給水ポンプの回転数を制御する
段階と、を有して成ることを特徴とする冷却水流
量調整方法である。 The gist of the present invention is as follows. That is, in a flow rate adjustment method suitable for the temperature of cooling water supplied by a cooling water supply system having a plurality of coolers, a step of detecting the temperature and pressure of water supply with a water temperature detector and a water pressure detector provided on the discharge side of the water supply pump. and a step of receiving the detected feed water temperature signal in a pressure determining calculator and calculating a feed water pressure suitable for the feed water temperature, and receiving the detected feed water pressure signal and the calculated feed water pressure signal in a pressure controller and calculating the pressure of both. A cooling water flow rate adjustment method comprising the steps of calculating a deviation, and controlling the rotation speed of the water supply pump by receiving the pressure deviation signal in a rotation speed control device.
本発明の詳細を実施例とその図面により説明す
る。第２図は第１図で示した従来の冷却給水系統
に新たに１点鎖線で囲つた自動調節機能を付加し
た本発明の冷却給水系統図である。すなわち、給
水ポンプ４の吐出側の給水管６に設けた水温検知
器１８によつて給水温度を検知し、これにより必
要な給水圧力Ｐを次の(1)式から圧力決定演算器２
０によつて演算決定する。 The details of the present invention will be explained with reference to examples and drawings thereof. FIG. 2 is a diagram of the cooling water supply system of the present invention in which an automatic adjustment function, which is surrounded by a dashed line, is newly added to the conventional cooling water supply system shown in FIG. That is, the water supply temperature is detected by the water temperature detector 18 installed in the water supply pipe 6 on the discharge side of the water supply pump 4, and the required water supply pressure P is determined by the pressure determination calculator 2 from the following equation (1).
Calculation is determined by 0.
Ｐ＝Ｘ／（Ｙ−２ｔｅ）２＋Po …(1)
ただしＰ：給水圧力（Kg／cm2）
te：給水温度（冷却水温度）（℃）
Po：最小必要給水圧力（℃）
Ｘ：hm（Ｑ／ｑｍ）２
Ｙ：Te＋Td−２Ｑ／ＡＫ
hm：ｍ冷却器の最高給水温度時の給水装置全
体の圧力損失（Kg／cm2）
Ｑ：ｍ冷却器の抜熱量（Kcal／ｈ）
qm：ｍ冷却器の最高給水温度時の給水量
（Kg／ｈ）
Te：ｍ冷却器における被冷却物の冷却器入口
温度（℃）
Td：ｍ冷却器における被冷却物の冷却器出口
温度（℃）
Ａ：ｍ冷却器の伝熱面積（m2）
Ｋ：ｍ冷却器の熱貫流率（Kcal／m2ｈ℃）
なおｍ冷却器とはその冷却水系統の冷却器の中
で、それぞれの給水温度において最も高い給水圧
力を必要とする冷却器のことである。 P=X/(Y-2te) 2 +Po...(1) where P: Water supply pressure (Kg/ cm2 ) te: Water supply temperature (cooling water temperature) (℃) Po: Minimum required water supply pressure (℃) X: hm (Q/qm) 2 Y: Te+Td-2Q/AK hm: Pressure loss of the entire water supply system at the maximum water supply temperature of the m cooler (Kg/cm 2 ) Q: Amount of heat removed from the m cooler (Kcal/h) qm : Water supply amount at the maximum water supply temperature of the m cooler (Kg/h) Te: Cooler inlet temperature of the object to be cooled in the m cooler (℃) Td: Cooler outlet temperature of the object to be cooled in the m cooler (℃) ) A: Heat transfer area of m cooler (m 2 ) K: Heat transmission coefficient of m cooler (Kcal/m 2 h℃) This is the cooler that requires the highest water supply pressure at the water supply temperature.
一方、給水ポンプ４の吐出側の給水管６に設け
た水圧検知器２２によつて給水圧力を検知し、演
算した給水圧力との圧力偏差を圧力制御器２４に
おいて算出し、この圧力偏差信号を回転数制御装
置２６にて変換して給水ポンプ４のモータ２８の
回転数を制御する。かくして第３図に示す如く、
給水温度に適したポンプ回転数、吐出圧力で給水
ポンプ４の運転ができる。 On the other hand, the water supply pressure is detected by the water pressure detector 22 installed in the water supply pipe 6 on the discharge side of the water supply pump 4, the pressure deviation from the calculated water supply pressure is calculated in the pressure controller 24, and this pressure deviation signal is The rotation speed is converted by the rotation speed control device 26 to control the rotation speed of the motor 28 of the water supply pump 4. Thus, as shown in Figure 3,
The water supply pump 4 can be operated at a pump rotation speed and discharge pressure suitable for the water supply temperature.
実施例
第２図に示す冷却給水系統を有する製鉄圧延工
場において、本発明法により給水温度、圧力を検
知し、給水ポンプの回転数を制御して冷却水量調
整を行つたが、冷却水系統の仕様は次のとおりで
ある。Example In a steel rolling factory having a cooling water supply system as shown in Fig. 2, the temperature and pressure of the supply water were detected using the method of the present invention, and the number of revolutions of the water supply pump was controlled to adjust the amount of cooling water. The specifications are as follows.
最高給水温度 32℃
給水ポンプ最大吐出量 1450m2／ｈ
給水ポンプ最大揚程 42ｍ
冷却器の台数 36台
冷却器の13台は冷却水の量を自動調節するため
自動調節弁を有しているが、残りの23台の冷却器
は投資効果を考慮して自動調節弁を有していな
い。Maximum water supply temperature: 32℃ Maximum water pump discharge rate: 1450 m 2 /h Water pump maximum head: 42 m Number of coolers: 36 units 13 coolers have automatic control valves to automatically adjust the amount of cooling water. The remaining 23 coolers do not have automatic control valves in consideration of investment efficiency.
この実施例の成績を第４〜８図の線図におい
て、冷却給水温度による自動調節機能を有しない
従来例と比較して示した。なお第４〜８図におい
て、線Ａは本発明の実施例、線Ｂは従来例を示し
ている。 The results of this example are shown in the diagrams of FIGS. 4 to 8 in comparison with a conventional example that does not have an automatic adjustment function based on the cooling water supply temperature. In FIGS. 4 to 8, line A shows the embodiment of the present invention, and line B shows the conventional example.
第４図は給水温度と給水量との関係を示すもの
で、本発明例と従来例の給水量の差は自動調節弁
を有しない冷却器において、本発明を適用した効
果により過剰な冷却水が流れなくなつたためであ
る。 Figure 4 shows the relationship between the water supply temperature and the amount of water supplied. This is because the flow stopped.
第５図は給水温度とポンプ消費動力との関係を
示すもので、低温側において本発明例のポンプ消
費動力は著しく減少し、本発明の自動制御の効果
の大きいことが分る。 FIG. 5 shows the relationship between the water supply temperature and the power consumption of the pump, and it can be seen that the power consumption of the pump in the example of the present invention is significantly reduced on the low temperature side, indicating that the automatic control of the present invention is highly effective.
第６図は給水温度とポンプ吐出圧力すなわち給
水圧力との関係を示すもので、給水温度によつて
圧力を変更する本発明例は従来例より著しく低圧
となつている。 FIG. 6 shows the relationship between the water supply temperature and the pump discharge pressure, that is, the water supply pressure, and the example of the present invention in which the pressure is changed depending on the temperature of the water supply has a significantly lower pressure than the conventional example.
第７図は給水温度の月平均の季節推移を示し、
第８図は月平均のポンプ所要動力の推移を示すも
ので、本発明例の消費電力は従来例に比し年平均
で95KWを節減し、特にその効果は寒冷期におい
て著しいことを示している。 Figure 7 shows the monthly average seasonal trends in water supply temperature.
Figure 8 shows the trends in the monthly average power required for the pump, and shows that the power consumption of the example of the present invention is reduced by 95KW per year on average compared to the conventional example, and this effect is particularly remarkable in the cold season. .
本発明は上記実施例からも明らかな如く、複数
の冷却器を有する冷却給水系の給水装置におい
て、給水温度によつて、給水ポンプの回転数を変
化させ、給水圧力を調節することによつて給水ポ
ンプの消費電力を大幅に節減する効果をあげるこ
とができた。 As is clear from the above embodiments, the present invention is a water supply system for a cooling water supply system having a plurality of coolers, by changing the rotational speed of the water supply pump and adjusting the water supply pressure depending on the temperature of the water supply. We were able to achieve a significant reduction in the power consumption of the water pump.
本発明法は製鉄工場以外の冷却にも広く適用で
きるのは勿論であるが、製鉄関係設備においても
次の如く広く応用が可能である。 It goes without saying that the method of the present invention can be widely applied to cooling other than steel factories, but can also be widely applied to iron manufacturing related equipment as described below.
(イ) 圧延機のロール冷却水 (ロ) 熱間圧延機におけるストリツプの冷却水 (ハ) 海水を使用する次の部門の冷却水 酸素発生工場 発電所 高炉炉底 (ニ) 高炉ステーブの冷却水(a) Roll cooling water for rolling mills (b) Cooling water for strips in hot rolling mills (c) Cooling water for the following departments that use seawater: oxygen generation factory Power plant Blast furnace hearth (d) Blast furnace stave cooling water
第１図は従来の冷却給水系統図、第２図は本発
明の冷却給水系統図、第３図は本発明の給水温度
と給水ポンプ回転数および給水ポンプ吐出圧力と
の関係を示す線図、第４図は給水温度と給水量と
の関係を示す線、第５図は給水温度とポンプ消費
動力との関係を示す線図、第６図は給水温度とポ
ンプ吐出力との関係を示す線図、第７図は年間の
給水温度の変化を示す線図、第８図は年間におけ
る月平均ポンプ消費動力の変化を示す線図であ
る。
４…給水ポンプ、６…給水管、１２…冷却器、
１８…水温検知器、２０…圧力決定演算器、２２
…水圧検知器、２４…圧力制御器、２６…回転数
制御装置。
Fig. 1 is a conventional cooling water supply system diagram, Fig. 2 is a cooling water supply system diagram of the present invention, and Fig. 3 is a diagram showing the relationship between the supply water temperature, the water supply pump rotation speed, and the water supply pump discharge pressure of the present invention. Figure 4 is a line showing the relationship between feed water temperature and water supply amount, Figure 5 is a line showing the relationship between feed water temperature and pump power consumption, and Figure 6 is a line showing the relationship between feed water temperature and pump discharge force. FIG. 7 is a diagram showing annual changes in water supply temperature, and FIG. 8 is a diagram showing annual changes in monthly average pump power consumption. 4... Water supply pump, 6... Water supply pipe, 12... Cooler,
18...Water temperature detector, 20...Pressure determination calculator, 22
...Water pressure detector, 24...Pressure controller, 26...Rotation speed control device.
Claims (1)
冷却水温に適した流量調整方法において、給水ポ
ンプ吐出側に設けられた水温検知器と水圧検知器
にて給水する温度と圧力を検知する段階と、前記
検知した給水温度信号を圧力決定演算器に受け前
記給水温度に適した給水圧力を演算する段階と、
前記検知した給水圧力信号と前記演算給水圧力信
号を圧力制御器に受け両者の圧力偏差を算出する
段階と、前記圧力偏差信号を回転数制御装置に受
け前記給水ポンプの回転数を制御する段階と、を
有して成ることを特徴とする冷却水流量調整方
法。1. In a flow rate adjustment method suitable for the temperature of cooling water supplied by a cooling water supply system having multiple coolers, a step of detecting the temperature and pressure of water supply with a water temperature detector and a water pressure detector provided on the discharge side of the water supply pump. , receiving the detected feed water temperature signal in a pressure determining calculator and calculating a feed water pressure suitable for the feed water temperature;
a step of receiving the detected water supply pressure signal and the calculated water supply pressure signal in a pressure controller and calculating a pressure deviation between the two; and a step of receiving the pressure deviation signal in a rotation speed control device and controlling the rotation speed of the water supply pump. A method for adjusting a cooling water flow rate, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16633282A JPS5956516A (en) | 1982-09-24 | 1982-09-24 | Method for adjusting flow rate of cooling water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16633282A JPS5956516A (en) | 1982-09-24 | 1982-09-24 | Method for adjusting flow rate of cooling water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5956516A JPS5956516A (en) | 1984-04-02 |
| JPS6249126B2 true JPS6249126B2 (en) | 1987-10-17 |
Family
ID=15829396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16633282A Granted JPS5956516A (en) | 1982-09-24 | 1982-09-24 | Method for adjusting flow rate of cooling water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5956516A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0465314U (en) * | 1990-10-18 | 1992-06-05 | ||
| WO2011092851A1 (en) * | 2010-01-29 | 2011-08-04 | 東芝三菱電機産業システム株式会社 | Water-injection control device in rolling line, water-injection control method, water-injection control program |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1593935A1 (en) * | 2004-05-06 | 2005-11-09 | Leica Geosystems AG | Levelling rod, level determining apparatus for said rod and level determining method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5134961Y2 (en) * | 1971-10-06 | 1976-08-30 |
-
1982
- 1982-09-24 JP JP16633282A patent/JPS5956516A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0465314U (en) * | 1990-10-18 | 1992-06-05 | ||
| WO2011092851A1 (en) * | 2010-01-29 | 2011-08-04 | 東芝三菱電機産業システム株式会社 | Water-injection control device in rolling line, water-injection control method, water-injection control program |
| CN102725078A (en) * | 2010-01-29 | 2012-10-10 | 东芝三菱电机产业系统株式会社 | Water-injection control device in rolling line, water-injection control method, water-injection control program |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5956516A (en) | 1984-04-02 |
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