JPH0425464B2 - - Google Patents
Info
- Publication number
- JPH0425464B2 JPH0425464B2 JP8230485A JP8230485A JPH0425464B2 JP H0425464 B2 JPH0425464 B2 JP H0425464B2 JP 8230485 A JP8230485 A JP 8230485A JP 8230485 A JP8230485 A JP 8230485A JP H0425464 B2 JPH0425464 B2 JP H0425464B2
- Authority
- JP
- Japan
- Prior art keywords
- inlet valve
- expander
- pressure
- temperature
- set value
- 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
- 238000005057 refrigeration Methods 0.000 description 8
- 230000007423 decrease Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Landscapes
- Separation By Low-Temperature Treatments (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
- Automatic Control Of Machine Tools (AREA)
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は、膨張機の制御方法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method for controlling an expander.
冷凍装置に用いられる膨張機は、その入口圧力
が高過ぎず、かつ膨張機出側温度が低過ぎない条
件で運転される必要がある。膨張機の寒冷発生量
が冷凍負荷よりも大なる場合は、膨張機温度が異
常に低下し、膨張機内で処理ガスの一部が液化し
て膨張機の破損に到ることもある。また、膨張機
の入口圧力が過大になつた場合には、膨張機が過
負荷となり、過速度になつて膨張機の停止に到る
こともある。
Expanders used in refrigeration equipment need to be operated under conditions where the inlet pressure is not too high and the expander outlet temperature is not too low. If the amount of cold generated by the expander is greater than the refrigeration load, the expander temperature may drop abnormally, and a portion of the processed gas may liquefy within the expander, resulting in damage to the expander. Furthermore, if the inlet pressure of the expander becomes excessive, the expander may become overloaded, resulting in overspeed and stopping of the expander.
なお、冷凍機の制御に関して、特開昭55−
49664号公報、特開昭54−116760号公報に開示さ
れたものが知られている。 Regarding the control of refrigerators, Japanese Patent Application Laid-Open No. 1983
Those disclosed in Japanese Patent Application Laid-open No. 49664 and Japanese Patent Application Laid-Open No. 116760/1983 are known.
本発明の目的は、運転状況の変化に対応して膨
張機を安定して運転することのできる膨張機の制
御方法を提供することにある。
An object of the present invention is to provide an expander control method that allows stable operation of the expander in response to changes in operating conditions.
本発明は、圧縮ガスを順次膨張させて寒冷を発
生させる第１段および第２段の膨張機と、第１段
の膨張機の入側に設けられ導入される圧縮ガスの
流量を調整する入口弁とを有するものにおいて、
第１段の膨張機の出側の温度を検出し設定値と比
較して温度が低いときには入口弁を閉める方向の
開度調節量を演算するとともに、第２段の膨張機
の入側の圧力を検出し設定値と比較して圧力が高
いときには入口弁を閉める方向の開度調節量を演
算し、それぞれの開度調節量のうち入口弁の開度
を小とする方の開度調節量を選択して、選択され
た開度調節量によつて入口弁を調節することによ
り、膨張機の異常温度低下および膨張機入口圧力
の上昇を防止して、運転状況の変化に対応して膨
張機を安定して運転できるようにしたものであ
る。
The present invention includes first and second stage expanders that sequentially expand compressed gas to generate refrigeration, and an inlet that is provided on the inlet side of the first stage expander and adjusts the flow rate of the compressed gas introduced. In those having a valve,
The temperature at the outlet side of the first stage expander is detected and compared with the set value, and when the temperature is low, the opening adjustment amount is calculated in the direction of closing the inlet valve, and the pressure at the inlet side of the second stage expander is calculated. is detected, and when the pressure is higher than the set value, the opening adjustment amount in the direction of closing the inlet valve is calculated, and among the respective opening adjustment amounts, the opening adjustment amount that reduces the opening of the inlet valve is calculated. By selecting and adjusting the inlet valve according to the selected opening adjustment amount, it is possible to prevent an abnormal temperature drop in the expander and a rise in the expander inlet pressure, and to expand in response to changes in operating conditions. This allows the machine to operate stably.
以下、本発明の一実施例を第１図により説明す
る。
An embodiment of the present invention will be described below with reference to FIG.
本図において、６は冷凍機で、５は冷凍機６に
高圧の圧縮ガスを供給する導管で、７は冷凍機６
からの戻りの低圧ガスを図示しないリサイクルの
圧縮機に戻すための導管ある。１１〜１５は冷凍
機６内で導管５からの圧縮ガスと導管７への戻り
ガスとの熱交換を行なわせる熱交換器である。９
および１０は膨張機で、この場合、熱交換器１２
を挾んで２つの膨張機を直列に接続してあり、冷
凍機６内で導管５からの圧縮ガスの一部を膨張さ
せて寒冷を発生させ、その後のガスは戻りの低圧
ガスに合流させられる。 In this figure, 6 is a refrigerator, 5 is a conduit that supplies high-pressure compressed gas to the refrigerator 6, and 7 is a refrigerator 6.
There is a conduit for returning low-pressure gas from the pump to a recycling compressor (not shown). Reference numerals 11 to 15 designate heat exchangers for exchanging heat between the compressed gas from the conduit 5 and the gas returned to the conduit 7 within the refrigerator 6. 9
and 10 are expanders, in this case heat exchanger 12
Two expanders are connected in series with each other in between, and a part of the compressed gas from the conduit 5 is expanded in the refrigerator 6 to generate cold, and the remaining gas is merged with the returning low-pressure gas. .
２は膨張機のラインへの圧縮ガスの流量を調節
のための入口弁で、第１段目の膨張機９の入口側
に設けられる。１は膨張機のラインの圧力制御装
置で、この場合、第２段目の膨張機１０の入口側
に設けてあり、その設定圧力よりも検出圧力が上
昇した場合は入口弁２を閉方向に、反対に低下し
た場合は入口弁２を開方向に調整する開度調節量
を演算し、調節信号SPを出力する。 Reference numeral 2 denotes an inlet valve for regulating the flow rate of compressed gas into the expander line, and is provided on the inlet side of the first stage expander 9. Reference numeral 1 denotes a pressure control device for the expander line, in this case, it is provided on the inlet side of the second stage expander 10, and when the detected pressure rises above the set pressure, the inlet valve 2 is moved in the closing direction. On the other hand, if the opening is decreased, the opening adjustment amount for adjusting the inlet valve 2 in the opening direction is calculated, and the adjustment signal S P is output.
３は膨張機のラインの温度制御装置で、第１段
目の膨張機９の下流側であれば良く、この場合、
熱交換器１２を出た膨張機１０の入口側に設けて
あり、その設定温度よりも検出温度が上昇した場
合は入口弁２を開方向に、反対に低下した場合に
入口弁２を閉方向に調節する開度調節量を演算
し、調節信号ST出力する。 3 is a temperature control device for the expander line, which may be on the downstream side of the first stage expander 9; in this case,
It is provided on the inlet side of the expander 10 that exits the heat exchanger 12, and when the detected temperature rises above the set temperature, the inlet valve 2 is opened, and when the temperature falls, the inlet valve 2 is closed. The opening adjustment amount is calculated and the adjustment signal ST is output.
４は信号選択器であり、圧力制御装置１および
温度制御装置３からの調節信号SP，STを入力し、
これらを比較して、入口弁２の開度をより小さく
する方の調節信号を選択して、この選択された調
節信号を入口弁２に出力する。 4 is a signal selector which inputs the adjustment signals S P and S T from the pressure control device 1 and the temperature control device 3;
These are compared, an adjustment signal that makes the opening degree of the inlet valve 2 smaller is selected, and this selected adjustment signal is output to the inlet valve 2.
なお、１６はＪ−Ｔ弁で、８は冷凍負荷であ
る。 In addition, 16 is a J-T valve, and 8 is a refrigeration load.
上記のように構成した第１図の装置において
は、圧縮機（図示せず）からの圧縮ガスは、導管
５から冷凍機６に導入される。圧縮ガスの一部
は、冷凍機６内において、入口弁２を介して膨張
機９，１０に供給され、寒冷発生に使用される。
残りの圧縮ガスは、熱交換器１１〜１５により冷
却され、弁１６を介して冷凍負荷８を冷凍し、今
度は戻りガスとなつて熱交換器１５〜１１により
徐々に温度回復され、導管７から圧縮機（図示せ
ず）にリサイクルされる。膨張機１０を出た寒冷
ガスは、戻りガスと合流される。 In the apparatus of FIG. 1 constructed as described above, compressed gas from a compressor (not shown) is introduced into a refrigerator 6 through a conduit 5. A part of the compressed gas is supplied to expanders 9 and 10 through the inlet valve 2 in the refrigerator 6 and used for generating cold.
The remaining compressed gas is cooled by heat exchangers 11 to 15, cools refrigeration load 8 through valve 16, and then becomes return gas, whose temperature is gradually recovered by heat exchangers 15 to 11, and then passed through conduit 7. from which it is recycled to a compressor (not shown). The cold gas leaving the expander 10 is combined with the return gas.
このように運転される装置において、冷凍負荷
が減少し、膨張機ラインの発生する寒冷が余剰と
なつた場合、冷凍機６が余分に冷却されるので、
膨張機９，１０の温度も低下する。温度制御装置
３で検出する膨張機９の出側の温度が設定値より
も低下した場合、膨張機１０の発生する寒冷も温
度低下して、膨張機１０内でガスが液化する可能
性もあるので、膨張機９の出側の温度を設定値に
維持せしめるために、温度制御装置３によつて入
口弁２の開度を小とする方向（閉方向）の開度調
節量を演算し、調節信号STを出力する。 In a device operated in this manner, when the refrigeration load decreases and the cold generated by the expander line becomes surplus, the refrigerator 6 is cooled extra.
The temperature of the expanders 9 and 10 also decreases. If the temperature on the outlet side of the expander 9 detected by the temperature control device 3 drops below the set value, the temperature of the cold generated by the expander 10 will also drop, and there is a possibility that the gas will liquefy inside the expander 10. Therefore, in order to maintain the temperature on the outlet side of the expander 9 at the set value, the temperature control device 3 calculates the amount of opening adjustment in the direction of decreasing the opening of the inlet valve 2 (closed direction). Outputs adjustment signal S T.
一方、膨張機ラインへ導入される圧縮ガスの圧
力が高くなると、膨張機９，１０の回転が速くな
る。圧力制御装置１で検出する膨張機１０の入側
の圧力が設定値よりも高くなつた場合、膨張機
９，１０の回転、特に、低温側の膨張機１０が過
回転となりやすいので、膨張機１０の入側の圧力
を設定値に維持せしめるために、圧力制御装置１
によつて入口弁２の開度を小とする方向（閉方
向）の開度調節量を演算し、調節信号SPを出力す
る。 On the other hand, as the pressure of the compressed gas introduced into the expander line increases, the rotation of the expanders 9 and 10 increases. When the pressure on the inlet side of the expander 10 detected by the pressure control device 1 becomes higher than the set value, the rotation of the expanders 9 and 10, especially the expander 10 on the low temperature side, is likely to become over-rotated. In order to maintain the pressure on the inlet side of 10 at a set value, a pressure control device 1 is provided.
The opening adjustment amount in the direction of decreasing the opening of the inlet valve 2 (in the closing direction) is calculated by , and the adjustment signal S P is output.
信号選択器４は、これらの両信号を比較し、入
口弁２をより閉方向（弁開度を小とする方向）と
する調節信号を選択出力する。この結果、入口弁
２の弁開度はより小となり、膨張機に流入する圧
縮ガス流量が減少し、膨張機の温度低下は防止さ
れる。 The signal selector 4 compares these two signals and selects and outputs an adjustment signal that causes the inlet valve 2 to be more closed (toward a smaller valve opening). As a result, the opening degree of the inlet valve 2 becomes smaller, the flow rate of compressed gas flowing into the expander decreases, and a drop in temperature of the expander is prevented.
反対に、冷凍負荷が増加し寒冷が不足気味とな
ると、温度制御装置３の出力STは、入口弁２の開
度を大とする方向の信号変化となる。この場合に
も、信号選択器４は、圧力制御装置１の出力SPと
STとを比較し、入口弁２の開度をより小にする方
の信号を選択出力する。これにより、入口弁２の
開度を小にすると、膨張機９に流入する圧縮ガス
の流量が減じられるので、膨張機１０の入側の圧
力は、圧力設定値より上昇することはなくなる。 On the other hand, when the refrigeration load increases and the amount of cold becomes insufficient, the output ST of the temperature control device 3 becomes a signal change in the direction of increasing the opening degree of the inlet valve 2. In this case as well, the signal selector 4 is connected to the output S P of the pressure control device 1.
S and T , and selects and outputs the signal that makes the opening degree of the inlet valve 2 smaller. As a result, when the opening degree of the inlet valve 2 is reduced, the flow rate of the compressed gas flowing into the expander 9 is reduced, so that the pressure on the inlet side of the expander 10 will not rise above the pressure setting value.
このように、過冷却になろうとすると、入口弁
２の開度をより小さくする調節信号STが選択さ
れ、これによつて過冷却が防止される。また寒冷
不足の場合、いくら温度制御装置３が入口弁２の
開度を大きくしようとする調節信号STを出力して
も入口弁の開度は調節信号SPにより制限を受ける
ので、膨張機の入口圧力が異常に増大するという
問題はなくなる。したがつて、膨張機を安定して
運転することができる。 In this way, when overcooling is about to occur, the adjustment signal ST that makes the opening degree of the inlet valve 2 smaller is selected, thereby preventing overcooling. In addition, in the case of insufficient cooling, no matter how much the temperature control device 3 outputs the adjustment signal S T to increase the opening degree of the inlet valve 2, the opening degree of the inlet valve is limited by the adjustment signal SP , so the expander The problem of abnormally increasing inlet pressure is eliminated. Therefore, the expander can be operated stably.
本発明によれば、運転状況の変化に対応して膨
張機を安定して運転することができ、膨張機の破
損、運転停止などのトラブルをなくすことができ
る。
According to the present invention, the expander can be operated stably in response to changes in operating conditions, and troubles such as damage to the expander and stoppage of operation can be avoided.
第１図は本発明の一実施例を示す図である。
１…圧力制御装置、２…入口弁、３…温度制御
装置、４…信号選択器、５…導管、６…冷凍機、
７…導管、８…冷凍負荷、９，１０…膨張機、１
１〜１５…熱交換器、１６…Ｊ−Ｔ弁。
FIG. 1 is a diagram showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Pressure control device, 2... Inlet valve, 3... Temperature control device, 4... Signal selector, 5... Conduit, 6... Refrigerator,
7... Conduit, 8... Refrigeration load, 9, 10... Expander, 1
1-15...Heat exchanger, 16...J-T valve.
Claims (1)
第１段および第２段の膨脹機と、前記第１段の膨
張機の入側に設けられ導入される前記圧縮ガスの
流量を調整する入口弁とを有するものにおいて、 前記第１段の膨張機の出側の温度を検出し、該
検出値と設定値と比較して、該温度が設定値より
も低い場合は前記入口弁を閉める方向に、該温度
が設定値よりも高い場合は前記入口弁を開く方向
に前記入口弁を制御する開度調節量を演算する工
程と、 前記第２段の膨張機の入側の圧力を検出し、該
検出値と設定値と比較して、該圧力が設定値より
も高い場合は前記入口弁を閉める方向に、該圧力
が設定値よりも低い場合は前記入口弁を開く方向
に前記入口弁を制御する開度調節量を演算する工
程と、 前記それぞれの開度調節量のうち前記入口弁の
開度を小とする方の開度調節量を選択し、該選択
された開度調節量によつて前記入口弁を調節する
する工程とを有することを特徴とする膨張機の制
御方法。[Scope of Claims] 1. First and second stage expanders that sequentially expand compressed gas to generate cold; and an inlet valve that adjusts the flow rate, the temperature at the outlet side of the first stage expander is detected, the detected value is compared with a set value, and if the temperature is lower than the set value, the calculating an opening adjustment amount for controlling the inlet valve in the direction of closing the inlet valve and in the direction of opening the inlet valve if the temperature is higher than a set value; and the inlet side of the second stage expander. Detects the pressure of and compares the detected value with a set value, and if the pressure is higher than the set value, the inlet valve is closed, and if the pressure is lower than the set value, the inlet valve is opened. calculating an opening adjustment amount for controlling the inlet valve in a direction; and selecting an opening adjustment amount that reduces the opening of the inlet valve from among the respective opening adjustment amounts, and calculating the selected opening adjustment amount. and adjusting the inlet valve according to an opening adjustment amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8230485A JPS61243258A (en) | 1985-04-19 | 1985-04-19 | Expander control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8230485A JPS61243258A (en) | 1985-04-19 | 1985-04-19 | Expander control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61243258A JPS61243258A (en) | 1986-10-29 |
| JPH0425464B2 true JPH0425464B2 (en) | 1992-04-30 |
Family
ID=13770809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8230485A Granted JPS61243258A (en) | 1985-04-19 | 1985-04-19 | Expander control method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61243258A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0788983B2 (en) * | 1989-11-13 | 1995-09-27 | 株式会社神戸製鋼所 | Turbine expander control method |
-
1985
- 1985-04-19 JP JP8230485A patent/JPS61243258A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61243258A (en) | 1986-10-29 |
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