JPH0349025B2 - - Google Patents
Info
- Publication number
- JPH0349025B2 JPH0349025B2 JP2280684A JP2280684A JPH0349025B2 JP H0349025 B2 JPH0349025 B2 JP H0349025B2 JP 2280684 A JP2280684 A JP 2280684A JP 2280684 A JP2280684 A JP 2280684A JP H0349025 B2 JPH0349025 B2 JP H0349025B2
- Authority
- JP
- Japan
- Prior art keywords
- expander
- flow rate
- pressure
- circuit
- compressor
- 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 claims description 9
- 238000000034 method Methods 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims 3
- 239000003507 refrigerant Substances 0.000 claims 2
- 230000001105 regulatory effect Effects 0.000 claims 1
- 239000007789 gas Substances 0.000 description 27
- 239000001307 helium Substances 0.000 description 4
- 229910052734 helium Inorganic materials 0.000 description 4
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は、極低温冷凍装置の運転制御方法に係
り、特に膨張機並びにジユール・トムソン弁（以
下、JT弁と略）を有する極低温冷凍装置の運転
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 the operation of a cryogenic refrigeration system, and particularly relates to a cryogenic refrigeration system having an expander and a Juul-Thompson valve (hereinafter abbreviated as JT valve). The present invention relates to an operation control method.
〔発明の背景〕
ヘリウム液化冷凍機、水素液化機等の膨張機並
びにJT弁を有する極低温冷凍装置において膨張
機のガス流量は膨張機の入口圧力を一定に保つよ
うに定値制御する方法等により制御されている。[Background of the Invention] In a cryogenic refrigeration system having an expander such as a helium liquefaction refrigerator or a hydrogen liquefaction machine and a JT valve, the gas flow rate of the expander is controlled by a method such as constant value control to keep the inlet pressure of the expander constant. controlled.
膨張機のガス流量すなわち膨張機の入口圧力に
は運転状況に応じた最適値が存在するが、しか
し、この最適値に制御することが困難であるた
め、膨張機にガスを流し過ぎて圧縮機能力をオー
バーしてしまつたり、逆に不足して圧縮機吐出ガ
スのバイパスによる無駄な電力消費が生ずるとい
つた欠点があつた。 There is an optimal value for the gas flow rate of the expander, that is, the inlet pressure of the expander, depending on the operating conditions, but it is difficult to control this optimal value, so too much gas may flow into the expander, causing the compression function to deteriorate. The drawback was that the power could be overpowered or, conversely, be underpowered, resulting in wasted power consumption due to the bypass of the compressor discharge gas.
本発明の目的は、膨張機のガス流量を運転状況
に応じて適正に制御することで、圧縮機での能力
オーバーと無駄な電力消費とを防止できる極低温
冷凍装置の運転制御方法を提供することにある。
An object of the present invention is to provide an operation control method for a cryogenic refrigeration system that can prevent overcapacity in a compressor and wasteful power consumption by appropriately controlling the gas flow rate of an expander according to operating conditions. There is a particular thing.
本発明は、バイパス回路に流れ込む高圧回路か
らのガス流量を検出し、該流量が多い場合は膨張
機の入口圧力設定値を高くし膨張機の入口弁開度
を開方向に制御し、該流量が少ない場合は膨張機
の入口圧力設定値を低くし膨張機の入口弁開度を
閉方向に制御して、バイパス流量を用いて膨張機
のガス流量を運転状況に応じて適正に制御するも
のである。
The present invention detects the gas flow rate from the high pressure circuit flowing into the bypass circuit, and when the flow rate is large, increases the inlet pressure setting value of the expander, controls the inlet valve opening of the expander in the opening direction, and controls the inlet valve opening of the expander in the opening direction. When the gas flow rate is low, the inlet pressure setting value of the expander is lowered, the inlet valve opening of the expander is controlled in the closing direction, and the gas flow rate of the expander is appropriately controlled according to the operating conditions using the bypass flow rate. It is.
ヘリウム液化冷凍機、水素液化機等の膨張機並
びにJT弁を有する極低温冷凍装置で、圧縮機の
吐出ガスは冷凍機に導入され、冷凍機内部の膨張
機並びにJT弁で膨張して寒冷を発生した後、圧
縮機の吸収側に戻されるが、圧縮機吐出量が冷凍
機内の流量よりも多い場合は、この過剰分はバイ
パスラインを通り冷凍機をバイパスする。一方、
冷凍機内の流量はJT弁並びに膨張機の入口弁に
よつて決定されるが、JT弁の液化、冷凍等の各
運転モードによつて弁開度が決定されるのに対し
て、膨張機の入口弁は開けば開くほど膨張機での
寒冷発生量が増加して装置能力が向上する。但
し、膨張機の入口弁の弁開度をあまり大きくし過
ぎると圧縮機での能力をオーバーしてしまう。
A cryogenic refrigeration system that has an expander such as a helium liquefaction refrigerator or hydrogen liquefaction machine and a JT valve.The discharge gas from the compressor is introduced into the refrigerator, and is expanded by the expander and JT valve inside the refrigerator to cool it. After generation, it is returned to the absorption side of the compressor, but if the compressor discharge amount is greater than the flow rate inside the refrigerator, this excess flow passes through the bypass line and bypasses the refrigerator. on the other hand,
The flow rate inside the refrigerator is determined by the JT valve and the inlet valve of the expander, but while the valve opening is determined by each operation mode of the JT valve, such as liquefaction and freezing, the flow rate in the expander is The more the inlet valve is opened, the more the amount of cold generated in the expander increases and the capacity of the device increases. However, if the opening degree of the inlet valve of the expander is made too large, the capacity of the compressor will be exceeded.
本発明者は、このような点につき種々検討を行
つた結果、バイパス流量を検知して、このバイパ
ス流量が最小となるように膨張機の入口弁の弁開
度を制御すれば、膨張機の入口圧力の最適制御を
行うことができ膨張機のガス流量を運転状況に応
じて適正に制御できるという知見を得た。 As a result of various studies on these points, the inventor of the present invention found that if the bypass flow rate is detected and the opening degree of the inlet valve of the expander is controlled so that the bypass flow rate is minimized, the expander can be improved. We obtained the knowledge that the inlet pressure can be optimally controlled and the gas flow rate of the expander can be appropriately controlled according to the operating conditions.
以下、本発明の一実施例を図面により説明す
る。 An embodiment of the present invention will be described below with reference to the drawings.
図面は、クロードサイクルを用いたヘリウム冷
凍機で、圧縮機１を出たガスはコールドボツクス
２に入り、第１熱交換器３で戻りガス及び液体窒
素（LN2）により冷却された後に膨張機ライン４
とJT弁ライン５とに分流する。膨張機ライン４
に分流したガスは第１膨張機６及び第２膨張機７
で断熱膨張して自身の温度を降下させた後に低圧
ライン８のガスに合流する。一方、JT弁ライン
５に分流したガスは第２熱交換器９〜第５熱交換
器１２で低圧ライン８を流れる戻りガスにより冷
却された後にJT弁１３で断熱膨張して一部液化
する。その後、被冷却体１４を冷却し第５熱交換
器１２に戻り低圧ライン８を通りJT弁ライン５
を流れるガスを冷却し自身の温度を上昇させ常温
になつた後に圧縮機１の吸入側に導かれる。 The drawing shows a helium refrigerator using a Claude cycle. Gas leaving the compressor 1 enters the cold box 2, is cooled by the return gas and liquid nitrogen (LN 2 ) in the first heat exchanger 3, and then passes through the expander. line 4
and JT valve line 5. Expander line 4
The gas divided into the first expander 6 and the second expander 7
After adiabatically expanding and lowering its own temperature, it joins the gas in the low pressure line 8. On the other hand, the gas branched into the JT valve line 5 is cooled by the return gas flowing through the low pressure line 8 in the second to fifth heat exchangers 9 to 12, and then adiabatically expanded in the JT valve 13 and partially liquefied. Thereafter, the object to be cooled 14 is cooled and returned to the fifth heat exchanger 12 through the low pressure line 8 and the JT valve line 5.
The gas flowing through the compressor 1 is cooled, its own temperature is raised, and after reaching room temperature, it is introduced to the suction side of the compressor 1.
この場合、圧縮機１を出たガスは、コールドボ
ツクス２に流れる流量が少ない間はバイパスライ
ン１５のバイパス弁１６，１７を通り一部バイパ
スする。一方、膨張機入口弁１８は第２膨張機７
の入口圧力を検出し圧力指示調節計１９によつて
制御されている。この圧力指示調節計１９の設定
値は、バイパスライン１５に流れるガス流量を検
出する流量指示調節計２０によつてカスケード制
御して設定される。この場合、バイパスライン１
５にバイパスするガスの流量が設定値より多い場
合には、圧力指示調節計１９の圧力設定値を高く
し膨張機へのガス導入量を多くするようにし、逆
に、バイパスするガスの流量が設定値より少なく
なつた場合には、圧力指示調節計１９の圧力設定
値を低くして膨張機へのガス導入量を少なくする
ように制御する。なお、流量指示調節計２０の設
定値は、最小値にしておく。また、圧力指示調節
計１９は、入口圧力が高い場合は膨張機入口弁１
８を絞る方向に制御し、入口圧力が低い場合は膨
張機入口弁１８を開く方向に制御する。 In this case, the gas exiting the compressor 1 passes through the bypass valves 16 and 17 of the bypass line 15 and is partially bypassed while the flow rate flowing into the cold box 2 is small. On the other hand, the expander inlet valve 18 is connected to the second expander 7.
The inlet pressure is detected and controlled by a pressure indicating controller 19. The set value of the pressure indicating regulator 19 is set by a flow rate indicating regulator 20 that detects the flow rate of gas flowing into the bypass line 15 under cascade control. In this case, bypass line 1
If the flow rate of the bypass gas is higher than the set value, the pressure setting value of the pressure indicating controller 19 is increased to increase the amount of gas introduced into the expander, and conversely, the flow rate of the bypass gas is increased. If the amount is less than the set value, the pressure setting value of the pressure indicating controller 19 is lowered to control the amount of gas introduced into the expander. Note that the setting value of the flow rate indicating controller 20 is set to the minimum value. In addition, when the inlet pressure is high, the pressure indicating controller 19 controls the expander inlet valve 1.
8 is controlled in the direction of narrowing the expander inlet valve 18, and when the inlet pressure is low, the expander inlet valve 18 is controlled in the direction of opening.
本実施例によれば、膨張機のガス流量を運転状
況に応じて適正化できるので、圧縮機での能力オ
ーバーと無駄な電力消費とを防止することができ
る。また、バイパスラインに流れるガス流量を最
小にできるので、圧縮機の吐出ガスのほぼ全量を
寒冷の発生に利用でき装置能力および効率を向上
させることができる。 According to this embodiment, the gas flow rate of the expander can be optimized according to the operating conditions, so overcapacity of the compressor and wasteful power consumption can be prevented. Furthermore, since the flow rate of gas flowing into the bypass line can be minimized, almost the entire amount of gas discharged from the compressor can be used to generate refrigeration, thereby improving device capacity and efficiency.
本発明は、以上説明したように膨張機の入口圧
力を圧縮機のバイパス流量を用いて制御すること
で、膨張機のガス流量を運転状況に応じて適正に
制御できるので、圧縮機での能力オーバーと無駄
な電力消費を防止できるという効果がある。
As explained above, by controlling the inlet pressure of the expander using the bypass flow rate of the compressor, the gas flow rate of the expander can be appropriately controlled according to the operating conditions, so that the capacity of the compressor can be increased. This has the effect of preventing excessive and wasteful power consumption.
図面は本発明を実施したヘリウム冷凍機の一例
を示すフローシートである。
１……圧縮機、７……第２膨張機、１３……
JT弁、１８……膨張機入口弁、１９……圧力指
示調節計、２０……流量指示調節計。
The drawing is a flow sheet showing an example of a helium refrigerator embodying the present invention. 1... Compressor, 7... Second expander, 13...
JT valve, 18... Expander inlet valve, 19... Pressure indicating controller, 20... Flow rate indicating controller.
Claims (1)
機内に供給する高圧回路と、該高圧回路から分岐
し前記冷凍機内の熱交換器およびジユールトムソ
ン弁を介して極低温冷媒を生成するJT回路と、
該JT回路から前記熱交換器を逆に介して前記圧
縮機の吸入側に戻す戻り回路と、前記分岐された
高圧回路の他方であつて膨張機を介して寒冷を発
生し前記戻り回路に合流する膨張機回路と、前記
圧縮機の吐出側と吸入側とを圧力調整弁を介して
つなぐバイパス回路とを有した極低温冷凍装置の
運転制御方法において、 前記バイパス回路に流れ込む前記高圧回路から
のガス流量を検出し、該流量が多い場合は前記膨
張機の入口圧力設定値を高くし前記膨張機の入口
弁開度を開方向に制御し、該流量が少ない場合は
前記膨張機の入口圧力設定値を低くし前記膨張機
の入口弁開度を閉方向に制御して、前記バイパス
流量を調整することを特徴とする極低温冷凍装置
の運転制御方法。[Scope of Claims] 1. A high-pressure circuit that supplies high-pressure refrigerant gas compressed by a compressor into a refrigerator; JT circuit that generates refrigerant,
A return circuit returns from the JT circuit to the suction side of the compressor via the heat exchanger, and the other of the branched high-pressure circuits generates refrigeration through an expander and joins the return circuit. A method for controlling the operation of a cryogenic refrigeration system having an expander circuit that connects a discharge side and a suction side of the compressor via a pressure regulating valve, the method comprising: The gas flow rate is detected, and if the flow rate is high, the inlet pressure setting value of the expander is increased and the inlet valve opening of the expander is controlled in the opening direction, and if the flow rate is low, the inlet pressure of the expander is increased. A method for controlling the operation of a cryogenic refrigeration system, characterized in that the bypass flow rate is adjusted by lowering a set value and controlling the opening degree of the inlet valve of the expander in the closing direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2280684A JPS60169060A (en) | 1984-02-13 | 1984-02-13 | Method of controlling operation of cryogenic refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2280684A JPS60169060A (en) | 1984-02-13 | 1984-02-13 | Method of controlling operation of cryogenic refrigerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60169060A JPS60169060A (en) | 1985-09-02 |
| JPH0349025B2 true JPH0349025B2 (en) | 1991-07-26 |
Family
ID=12092929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2280684A Granted JPS60169060A (en) | 1984-02-13 | 1984-02-13 | Method of controlling operation of cryogenic refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60169060A (en) |
-
1984
- 1984-02-13 JP JP2280684A patent/JPS60169060A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60169060A (en) | 1985-09-02 |
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