CN115289738A - Liquid nitrogen cooling system for underground monochromator and using method thereof - Google Patents
Liquid nitrogen cooling system for underground monochromator and using method thereof Download PDFInfo
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- CN115289738A CN115289738A CN202210926876.3A CN202210926876A CN115289738A CN 115289738 A CN115289738 A CN 115289738A CN 202210926876 A CN202210926876 A CN 202210926876A CN 115289738 A CN115289738 A CN 115289738A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 426
- 239000007788 liquid Substances 0.000 title claims abstract description 307
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 204
- 238000001816 cooling Methods 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000006200 vaporizer Substances 0.000 claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims description 21
- 230000000087 stabilizing effect Effects 0.000 claims description 20
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 18
- 238000012544 monitoring process Methods 0.000 claims description 10
- 230000001502 supplementing effect Effects 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 3
- 206010003497 Asphyxia Diseases 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
- F25D3/10—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D23/00—General constructional features
- F25D23/006—General constructional features for mounting refrigerating machinery components
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D23/00—General constructional features
- F25D23/12—Arrangements of compartments additional to cooling compartments; Combinations of refrigerators with other equipment, e.g. stove
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/005—Mounting of control devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2600/00—Control issues
- F25D2600/06—Controlling according to a predetermined profile
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- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention relates to a liquid nitrogen cooling system for an underground monochromator and a using method thereof, wherein the system comprises a liquid nitrogen tank, a phase separator, a circulating unit and a vaporizer, wherein the liquid nitrogen tank is communicated with the phase separator through a first liquid supply pipe, the phase separator is communicated with the circulating unit through a second liquid supply pipe, and the circulating unit is communicated with the monochromator through a circulating pipeline; the phase separator is communicated with an inlet of the vaporizer through a first exhaust pipe, an outlet of the vaporizer is communicated with a third exhaust pipe, the third exhaust pipe is communicated with the ground, and the circulating unit is communicated with the first exhaust pipe through a second exhaust pipe. According to the liquid nitrogen cooling system and the using method thereof, nitrogen is discharged to the ground in a closed loop mode through the exhaust pipe, so that the phenomenon that workers are suffocated due to direct discharge in a well is avoided, and the safety of the underground working environment is guaranteed.
Description
Technical Field
The invention relates to the technical field of monochromator cooling, in particular to a liquid nitrogen cooling system for an underground monochromator and a using method thereof.
Background
The monochromator absorbs heat and then generates thermal deformation, which damages the transmission of the light source and the energy resolution of the monochromatic light, so that it is important to deal with the cooling problem of the monochromator. In the prior art, the monochromator is cooled by water with low power density and cooled by liquid nitrogen with high power density.
The existing liquid nitrogen cooling systems are all used on the ground, nitrogen formed after liquid nitrogen absorbs heat is directly discharged into the air, and workers can be suffocated if the nitrogen is directly discharged underground, so that the existing liquid nitrogen cooling systems are not suitable for monochromators in underground or tunnels; and the existing liquid nitrogen cooling system is usually provided with a plurality of control boxes, the control layout is dispersed, and the operation is inconvenient.
Disclosure of Invention
The invention aims to provide a liquid nitrogen cooling system for an underground monochromator and a using method thereof.
The invention provides a liquid nitrogen cooling system for an underground monochromator, which comprises a liquid nitrogen tank, a phase separator, a circulating unit and a vaporizer, wherein the liquid nitrogen tank is communicated with the phase separator through a first liquid supply pipe, the phase separator is communicated with the circulating unit through a second liquid supply pipe, and the circulating unit is communicated with the monochromator through a circulating pipeline; the phase separator is communicated with an inlet of the vaporizer through a first exhaust pipe, an outlet of the vaporizer is communicated with a third exhaust pipe, the third exhaust pipe leads to the ground, and the circulating unit is communicated with the first exhaust pipe through a second exhaust pipe.
Further, the liquid nitrogen tank is arranged on the ground, the vaporizer is arranged on the ground or underground, and the phase separator and the circulator group are arranged underground.
Further, the shell of phase separator is provided with first level gauge, first heating rod and first pressure transmitter, the one end of first level gauge and first heating rod all stretches into inside the phase separator, first pressure transmitter intercommunication the inside of phase separator.
Furthermore, a first electromagnetic valve is arranged on the first liquid supply pipe, a second electromagnetic valve is arranged on the first exhaust pipe, and a third electromagnetic valve is arranged on the second liquid supply pipe.
Further, be provided with surge tank and liquid nitrogen pool in the circulating line unit, the second feed pipe accesss to in the surge tank, the liquid nitrogen pool pass through the third feed pipe with the second feed pipe intercommunication, the second blast pipe with the liquid nitrogen pool intercommunication.
Furthermore, a fourth electromagnetic valve is arranged at a position, close to the pressure stabilizing tank, of the second liquid supply pipe, a fifth electromagnetic valve is arranged on the third liquid supply pipe, and a sixth electromagnetic valve is arranged on the second exhaust pipe; the pressure stabilizing tank is communicated with the liquid nitrogen pool through a fourth exhaust pipe, and a seventh electromagnetic valve is arranged on the fourth exhaust pipe.
Further, be provided with second level gauge, second pressure transmitter, third level gauge and second heating rod on the shell of circulation unit, the one end of second level gauge stretches into in the liquid nitrogen bath, second pressure transmitter intercommunication the liquid nitrogen bath, third pressure transmitter intercommunication the surge tank, the third level gauge with the one end of second heating rod all stretches into in the surge tank.
Furthermore, the circulating pipeline part is positioned in the liquid nitrogen pool, a liquid nitrogen pump and a heat exchanger are arranged on the circulating pipeline, the pressure stabilizing tank is communicated with an inlet of the liquid nitrogen pump through a communicating pipe, and the heat exchanger is immersed by liquid nitrogen in the liquid nitrogen pool.
And the evaporator is connected with the first liquid supply pipe through a first electromagnetic valve, the evaporator is connected with the second liquid supply pipe through a second liquid supply pipe, and the evaporator is connected with the first liquid supply pipe through a second electromagnetic valve.
Furthermore, a control box is arranged on the shell of the phase separator, and the control box is electrically connected with the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the first liquid level meter, the second liquid level meter, the third liquid level meter, the first pressure transmitter, the third pressure transmitter, the liquid nitrogen pump and the thermometer.
Further, the first liquid supply pipe, the second liquid supply pipe, the first exhaust pipe, the second exhaust pipe and the pre-cooling pipe are all vacuum interlayer pipes; the joints of the phase separator, the first liquid supply pipe, the first exhaust pipe and the second liquid supply pipe are all welded.
In another aspect, the present invention provides a method for using a liquid nitrogen cooling system for a downhole monochromator, which adopts the liquid nitrogen cooling system for a downhole monochromator and comprises the following steps:
s1: when the liquid nitrogen level in the phase separator is lower than a first preset liquid level, the first liquid level meter sends a monitoring signal to the control box, the control box controls the first electromagnetic valve and the second electromagnetic valve to be opened, liquid nitrogen is supplemented, nitrogen gas is discharged, and the first electromagnetic valve and the second electromagnetic valve are closed after the liquid level reaches a second preset liquid level;
s2: opening a third electromagnetic valve, supplying liquid nitrogen to the second liquid supply pipe, and simultaneously opening a first heating rod to maintain the pressure in the phase separator within a first preset pressure range;
s3: opening a fourth electromagnetic valve and a fifth electromagnetic valve, supplementing liquid nitrogen to a liquid nitrogen pool and a pressure stabilizing tank, and closing the fourth electromagnetic valve when the liquid level of the liquid nitrogen pool reaches a third preset liquid level; when the liquid level in the pressure stabilizing tank reaches a fifth preset liquid level, closing the fifth electromagnetic valve;
s4: starting a second heating rod, and maintaining the pressure in the pressure stabilizing tank within a second preset pressure range;
s5: and starting a liquid nitrogen pump to drive liquid nitrogen to circularly flow in the circulating pipeline, so that the monochromator is circularly refrigerated.
Further, still include:
if the liquid level of the liquid nitrogen in the liquid nitrogen pool is lower than a fourth preset liquid level, the liquid level in the pressure stabilizing tank is lower than a sixth preset liquid level, and the step S3 is repeated;
after the circulation unit stops running, if the temperature of the thermometer is higher than the preset temperature, the eighth electromagnetic valve is opened;
and if the pressure in the pressure stabilizing tank is larger than a second preset pressure range, opening a sixth electromagnetic valve and a seventh electromagnetic valve.
The liquid nitrogen cooling system for the underground monochromator and the using method thereof realize the separation of liquid nitrogen and nitrogen through the phase separator, convey pure liquid nitrogen to the liquid nitrogen pool and the pressure stabilizing tank, and stabilize and supplement liquid for the circulating pipeline through the pressure stabilizing tank, thereby providing the pure liquid nitrogen with controllable pressure and flow rate and uniformly refrigerating the monochromator; nitrogen is discharged to the ground from the underground through a closed loop, so that the occurrence of suffocation accidents is avoided, and the safety of the underground working environment is guaranteed.
Drawings
FIG. 1 is a schematic diagram of a liquid nitrogen cooling system for a downhole monochromator according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a phase separator according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a circulation unit according to an embodiment of the present invention;
FIG. 4 is a flow chart of a method of using a liquid nitrogen cooling system for a downhole monochromator according to another embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, an embodiment of the present invention provides a liquid nitrogen cooling system for a downhole monochromator, comprising a liquid nitrogen tank 100, a phase separator 200, a circulation unit 300 and a vaporizer 900, wherein the liquid nitrogen tank 100 is communicated with the phase separator 200 through a first liquid supply pipe 500, the phase separator 200 is communicated with the circulation unit 300 through a second liquid supply pipe 700, and the circulation unit 300 is communicated with the monochromator 400 through a circulation pipe 1000; the phase separator 200 is communicated with the inlet of the vaporizer 900 through a first exhaust pipe 600, the circulation unit 300 is communicated with the first exhaust pipe 600 through a second exhaust pipe 601, the outlet of the vaporizer 900 is communicated with a third exhaust pipe 602, and the third exhaust pipe 602 is communicated to the ground; the circulation unit 300 is communicated with the first exhaust pipe 600 through the second exhaust pipe 601. Liquid nitrogen in the liquid nitrogen tank 100 enters the phase separator 200 through the first liquid supply pipe 500, because the liquid nitrogen may be lost in the first liquid supply pipe 500, that is, part of the liquid nitrogen absorbs heat and becomes nitrogen gas, gas-liquid separation needs to be performed in the phase separator to obtain pure liquid nitrogen, the separated liquid nitrogen enters the circulating unit 300 and then circularly flows in the circulating pipeline 1000, so that the monochromator 400 is cooled, low-temperature nitrogen generated in the cooling process enters the first exhaust pipe 600 through the second exhaust pipe 601 or directly enters the first exhaust pipe 600 and then enters the vaporizer 900, and is discharged to the ground through the third exhaust pipe 602 after changing to room temperature, so that closed-loop discharge of the nitrogen gas is realized, suffocation of experimenters due to direct discharge underground is avoided, and safety of underground working environment is guaranteed.
In this embodiment, the liquid nitrogen tank 100 is placed at the surface, and the vaporizer 900 may be placed at the surface or downhole, and other devices are all placed downhole.
As shown in fig. 2, a first liquid level meter 201, a first heating rod 203 and a first pressure transmitter 204 are arranged on the shell of the phase separator 200, one end of each of the first liquid level meter 201 and the first heating rod 203 extends into the phase separator 200, and the first liquid level meter 201 is used for monitoring the liquid level of liquid nitrogen in the phase separator 200; the first heating rod 203 is configured to heat the liquid nitrogen when the pressure in the phase separator 200 decreases or the liquid nitrogen is supplied, so that the liquid nitrogen in the phase separator 200 is vaporized, and the internal pressure is increased or maintained within a set range; a first pressure transducer 204 communicates with the interior of phase separator 200 for monitoring pressure changes within phase separator 200.
The first liquid supply pipe 500 is provided with a first electromagnetic valve 202 which is positioned at the liquid inlet of the phase separator 200 and is used for controlling the flow of liquid nitrogen entering the phase separator 500; the first exhaust pipe 600 is provided with a second electromagnetic valve 206 which is positioned at the exhaust port of the phase separator 200 and is used for controlling the discharge amount of nitrogen in the phase separator 500; the second liquid supply pipe 700 is provided with a third solenoid valve 205 at the liquid outlet of the phase separator 200 for controlling the amount of liquid nitrogen flowing out of the phase separator 500.
As shown in fig. 3, a surge tank 305 and a liquid nitrogen pool 316 are provided in the circulation unit 300, the second supply pipe 700 leads into the surge tank 305 to connect the phase separator 200 and the surge tank 305, and the circulation unit 300 is further provided with a third supply pipe 302 having one end connected to the second supply pipe 700 and the other end leading to the liquid nitrogen pool 316, so that a part of the liquid nitrogen in the phase separator 200 enters the surge tank 305 through the second supply pipe 700 and the other part enters the third supply pipe 302 through the second supply pipe 700 and then enters the liquid nitrogen pool 316 through the third supply pipe 302. A fourth electromagnetic valve 303 is arranged on the second liquid supply pipe 700 (close to the surge tank 305) and used for controlling the flow of liquid nitrogen entering the surge tank 305; a fifth electromagnetic valve 304 is arranged on the third liquid supply pipe 302 and is used for controlling the flow of liquid nitrogen entering the liquid nitrogen pool 316; the second exhaust pipe 601 is communicated with the liquid nitrogen tank 316, and a sixth electromagnetic valve 307 is arranged on the second exhaust pipe and is used for controlling the discharge amount of nitrogen in the liquid nitrogen tank 316.
A second liquid level meter 301, a second pressure transmitter 315, a third pressure transmitter 308, a third liquid level meter 309 and a second heating rod 306 are arranged on the shell of the circulating unit 300, and one end of the second liquid level meter 301 extends into a liquid nitrogen pool 316 and is used for monitoring the liquid level of liquid nitrogen in the liquid nitrogen pool 316; the second pressure transmitter 315 is communicated with the liquid nitrogen pool 316 and is used for monitoring the pressure change in the liquid nitrogen pool 316; the third pressure transmitter 308 is communicated with the surge tank 305 and is used for monitoring the pressure change in the surge tank 305; one end of a third liquid level meter 309 and one end of a second heating rod 306 both extend into the surge tank 305, the third liquid level meter 309 is used for monitoring the liquid level of the liquid nitrogen in the surge tank 305, and the second heating rod 306 is used for heating the liquid nitrogen in the surge tank 305 to vaporize the liquid nitrogen into nitrogen gas so as to increase the internal pressure or maintain the pressure within a set range.
The surge tank 305 is communicated with the liquid nitrogen pool 316 through a fourth exhaust pipe 311 to discharge the nitrogen gas in the surge tank 305 into the liquid nitrogen pool 316, and a seventh electromagnetic valve 310 is provided on the fourth exhaust pipe 311 to control the discharge amount of the nitrogen gas in the surge tank 305.
The circulation pipeline 1000 is partially located in the liquid nitrogen tank 316, and the surge tank 305 is communicated with the circulation pipeline 1000 through the communication pipe 312, so that liquid nitrogen is supplied to the circulation pipeline 1000, the pressure and the flow in the circulation pipeline 1000 are maintained stable, and the phenomenon that the performance of the monochromator 400 is affected due to uneven cooling caused by unstable pressure and flow is avoided.
A liquid nitrogen pump 313 and a heat exchanger 314 are arranged on the circulating pipeline 1000, and the inlet of the liquid nitrogen pump 313 is communicated with the communicating pipe 312 and is used for pumping liquid nitrogen so as to circulate in the circulating pipeline 1000; the heat exchanger 314 is submerged in liquid nitrogen in the liquid nitrogen pool 316 to exchange heat between the liquid nitrogen and/or nitrogen in the circulation line 1000 and the liquid nitrogen in the liquid nitrogen pool 316. The circulation pipeline 1000 is further provided with a release valve 317, and when the nitrogen in the circulation pipeline 1000 is too much and the pressure is too high, part of the nitrogen can be discharged into the liquid nitrogen tank 316 through the release valve 317.
With continued reference to fig. 1, the liquid nitrogen cooling system further includes a pre-cooling pipe 800, both ends of which are respectively communicated with the second liquid supply pipe 700 and the vaporizer 900, and a thermometer 801 and an eighth electromagnetic valve 802 are further disposed on the pre-cooling pipe 800, and the thermometer 801 is used for monitoring the temperature in the pre-cooling pipe 800. During normal operation, the eighth solenoid valve 802 is closed, part of liquid nitrogen enters the pre-cooling pipe 800 through the second liquid supply pipe 700, when the circulation unit 300 stops operating, the third solenoid valve 205, the fourth solenoid valve 303 and the fifth solenoid valve 304 are closed, liquid nitrogen still remains in the second liquid supply pipe 700 and the pre-cooling pipe 800, the temperature of the liquid nitrogen in the second liquid supply pipe 700 and the pre-cooling pipe 800 gradually rises due to no new liquid nitrogen supplement, when the temperature of the thermometer 801 exceeds a preset value, the third solenoid valve 205 and the eighth solenoid valve 802 are opened, the liquid nitrogen enters the vaporizer 900 to be vaporized and then is discharged to the ground through the third gas discharge pipe 602, then the liquid nitrogen in the phase separator 200 is replenished into the second liquid supply pipe 700 and the pre-cooling pipe 800 until the temperature of the thermometer 801 returns to below the preset value, then the third solenoid valve 205 and the eighth solenoid valve 802 are closed, and if the subsequent temperature continues to rise below the preset value, the steps are repeated, so that the liquid nitrogen in the second liquid supply pipe 700 and the pre-cooling pipe 800 is kept within a preset temperature range.
The joints of the first liquid supply pipe 500, the first exhaust pipe 600, the second liquid supply pipe 700 and the phase separator 200 are all welded, so that the leakage of liquid nitrogen or cold nitrogen due to damage of a gasket in flange connection is avoided.
Vaporizer 900 may vaporize the liquid nitrogen in pre-cooling pipe 800 into nitrogen gas, or may raise the temperature of the cold nitrogen gas discharged from first exhaust pipe 600 and second exhaust pipe 601 to normal temperature, and finally discharge the cold nitrogen gas to the ground through third exhaust pipe 602.
The shell of the phase separator 200 is also provided with a control box 207 which is electrically connected with each electromagnetic valve, the liquid level meter, the pressure transmitter, the liquid nitrogen pump and the like so as to realize automatic control. The system can be automatically controlled through one control box 207, and the operation is convenient.
The pressure in the phase separator 200, surge tank 305 and liquid nitrogen tank 316 must be maintained within a predetermined range, for example, 3-4 atmospheres gauge in the phase separator 200, 2-3 atmospheres gauge in the surge tank 305 and 1 atmosphere gauge in the liquid nitrogen tank 316.
The cooling process of the liquid nitrogen cooling system of the invention is as follows:
liquid nitrogen in the liquid nitrogen tank 100 enters the phase separator 200 through the first liquid supply pipe 500, part of the liquid nitrogen in the first liquid supply pipe 500 may be vaporized into nitrogen gas by heat absorption, the liquid nitrogen and the nitrogen gas are separated in the phase separator 200, the nitrogen gas enters the vaporizer 900 through the first exhaust pipe 600 and then is discharged through the third exhaust pipe 602, the liquid nitrogen is remained in the phase separator 200, when the liquid level of the phase separator 200 reaches a preset liquid level, the liquid nitrogen enters the surge tank 305 and the third liquid supply pipe 302 through the second liquid supply pipe 700 respectively, and then enters the liquid nitrogen pool 316 through the third liquid supply pipe 302; after the liquid levels of the liquid nitrogen in the surge tank 305 and the liquid nitrogen tank 316 reach preset liquid levels, the liquid nitrogen in the surge tank 305 enters the circulation pipeline 1000 through the communicating pipe 312, circulates in the circulation pipeline 1000 through the liquid nitrogen pump 313, exchanges heat with the monochromator 400, and cools the monochromator 400, the temperature of the liquid nitrogen after heat exchange is increased (partially changed into nitrogen), exchanges heat with the liquid nitrogen with low temperature in the liquid nitrogen tank 316 through the heat exchanger 314, continues to cool the monochromator 400 after being changed into cold liquid nitrogen again, the liquid nitrogen in the liquid nitrogen tank 316 absorbs heat, is vaporized into nitrogen, is discharged to the first exhaust pipe 600 from the second exhaust pipe 601, then enters the vaporizer 900, and is finally discharged to the ground through the third exhaust pipe 602, so that the circulation is repeated.
According to the liquid nitrogen cooling system for the downhole monochromator, provided by the embodiment of the invention, the separation of liquid nitrogen and nitrogen is realized through the phase separator 200, pure liquid nitrogen is conveyed to the liquid nitrogen pool 316 and the pressure stabilizing tank 305, and the pressure stabilizing and liquid supplementing are carried out on the circulating pipeline 1000 through the pressure stabilizing tank 305, so that the pure liquid nitrogen with controllable pressure and flow is provided, and the monochromator 400 is uniformly refrigerated; nitrogen is discharged to the ground from the underground through a closed loop, so that the occurrence of suffocation accidents is avoided, and the safety of the underground working environment is guaranteed.
As shown in FIG. 4, another embodiment of the present invention provides a method of using a liquid nitrogen cooling system for a downhole monochromator, comprising the steps of:
s1: when the liquid level of liquid nitrogen in the phase separator 200 is lower than a first preset liquid level (for example, 150L), the first liquid level meter 201 sends a monitoring signal to the control box 207, the control box 207 controls the first electromagnetic valve 202 and the second electromagnetic valve 206 to be opened, liquid nitrogen is supplemented and nitrogen gas is discharged, and the first electromagnetic valve 202 and the second electromagnetic valve 206 are closed after the liquid level reaches a second preset liquid level (for example, 450L);
s2: opening third solenoid valve 205 to supply liquid nitrogen to second liquid supply pipe 700 while opening first heating rod 203 to maintain the pressure inside phase separator 200 within a first predetermined pressure range (e.g., 3-4 atm);
s3: opening the fourth electromagnetic valve 303 and the fifth electromagnetic valve 304, supplementing liquid nitrogen to a liquid nitrogen pool 316 and a pressure stabilizing tank 305, and closing the fourth electromagnetic valve 303 when the liquid level of the liquid nitrogen pool 316 reaches a third preset liquid level (for example, 100L); when the liquid level in the surge tank 305 reaches a fifth preset liquid level (for example, 15L), the fifth electromagnetic valve 304 is closed;
s4: starting the second heating rod 306 to maintain the pressure in the surge tank 305 within a second preset pressure range (for example, 2-3 standard atmospheres);
s5: the liquid nitrogen pump 313 is turned on to drive liquid nitrogen to circulate in the circulation line 1000, thereby performing the circulation refrigeration of the monochromator 400.
If the liquid level of the liquid nitrogen in the liquid nitrogen pool 316 is lower than a fourth preset liquid level (for example, 30L), and the liquid level in the surge tank is lower than a sixth preset liquid level (for example, 5L), repeating the step S3;
after the circulation unit 300 stops operating, if the temperature of the thermometer 801 is higher than the preset temperature, the eighth electromagnetic valve 802 is opened.
In step S4, if the pressure in the surge tank 305 is greater than the second preset pressure range, the sixth and seventh electromagnetic valves 307 and 310 are opened to discharge nitrogen gas, thereby reducing the pressure.
Through the above operations, the phase separator 200 can separate liquid nitrogen from nitrogen gas, and deliver pure liquid nitrogen to the liquid nitrogen pool 316 and the surge tank 305 of the circulating unit 300, and the surge tank 305 can realize pressure stabilization and liquid supplementing functions, so as to provide pure liquid nitrogen with controllable pressure and flow for the monochromator 400, and perform uniform refrigeration on the pure liquid nitrogen, and the nitrogen gas is discharged from the underground to the ground through a closed loop.
The use method of the liquid nitrogen cooling system for the underground monochromator, provided by the embodiment of the invention, can provide pure liquid nitrogen with controllable pressure and flow for the monochromator so as to uniformly refrigerate the monochromator, and the nitrogen is discharged to the ground from the underground through a closed loop, so that the suffocation of underground workers is avoided, and the safety of the underground working environment is ensured.
The above embodiments are merely preferred embodiments of the present invention, which are not intended to limit the scope of the present invention, and various changes may be made in the above embodiments of the present invention. All simple and equivalent changes and modifications made according to the claims and the content of the specification of the present application fall within the scope of the claims of the present patent application. The invention has not been described in detail in order to avoid obscuring the invention.
Claims (13)
1. A liquid nitrogen cooling system for a downhole monochromator is characterized by comprising a liquid nitrogen tank, a phase separator, a circulating unit and a vaporizer, wherein the liquid nitrogen tank is communicated with the phase separator through a first liquid supply pipe, the phase separator is communicated with the circulating unit through a second liquid supply pipe, and the circulating unit is communicated with the monochromator through a circulating pipeline; the phase separator is communicated with an inlet of the vaporizer through a first exhaust pipe, an outlet of the vaporizer is communicated with a third exhaust pipe, the third exhaust pipe is communicated with the ground, and the circulating unit is communicated with the first exhaust pipe through a second exhaust pipe.
2. The liquid nitrogen cooling system for a downhole monochromator of claim 1, wherein the liquid nitrogen tank is disposed at the surface, the vaporizer is disposed at the surface or downhole, and the phase separator and the circulator group are disposed downhole.
3. The liquid nitrogen cooling system for a downhole monochromator of claim 1, wherein the housing of the phase separator is provided with a first liquid level meter, a first heating rod and a first pressure transmitter, one end of the first liquid level meter and one end of the first heating rod both extend into the interior of the phase separator, and the first pressure transmitter is communicated with the interior of the phase separator.
4. The liquid nitrogen cooling system for a downhole monochromator of claim 3, wherein the first supply tube is provided with a first solenoid valve, the first exhaust tube is provided with a second solenoid valve, and the second supply tube is provided with a third solenoid valve.
5. The liquid nitrogen cooling system for the downhole monochromator of claim 4, wherein a surge tank and a liquid nitrogen pool are provided in the circulating unit, the second liquid supply pipe opens into the surge tank, the liquid nitrogen pool communicates with the second liquid supply pipe through a third liquid supply pipe, and the second gas exhaust pipe communicates with the liquid nitrogen pool.
6. The liquid nitrogen cooling system for a downhole monochromator of claim 5, wherein the second liquid supply tube is provided with a fourth solenoid valve near the surge tank, the third liquid supply tube is provided with a fifth solenoid valve, and the second gas exhaust tube is provided with a sixth solenoid valve; the pressure stabilizing tank is communicated with the liquid nitrogen pool through a fourth exhaust pipe, and a seventh electromagnetic valve is arranged on the fourth exhaust pipe.
7. The liquid nitrogen cooling system for the downhole monochromator according to claim 6, wherein a second liquid level meter, a second pressure transmitter, a third liquid level meter and a second heating rod are arranged on a shell of the circulating unit, one end of the second liquid level meter extends into the liquid nitrogen pool, the second pressure transmitter is communicated with the liquid nitrogen pool, the third pressure transmitter is communicated with the surge tank, and one ends of the third liquid level meter and the second heating rod both extend into the surge tank.
8. The liquid nitrogen cooling system for the downhole monochromator of claim 7, wherein the circulating pipeline is partially located in the liquid nitrogen pool, a liquid nitrogen pump and a heat exchanger are arranged on the circulating pipeline, the surge tank is communicated with an inlet of the liquid nitrogen pump through a communicating pipe, and the heat exchanger is immersed by liquid nitrogen in the liquid nitrogen pool.
9. The liquid nitrogen cooling system for the downhole monochromator of claim 8, further comprising a pre-cooling pipe, wherein two ends of the pre-cooling pipe are respectively communicated with the second liquid supply pipe and the vaporizer, and a thermometer and an eighth solenoid valve are further arranged on the pre-cooling pipe.
10. The liquid nitrogen cooling system for a downhole monochromator of claim 9, wherein a control box is provided on the outer shell of the phase separator, the control box being electrically connected to the first to eighth solenoid valves, the first to third level meters, the first to third pressure transmitters, the liquid nitrogen pump, and the thermometer.
11. The liquid nitrogen cooling system for a downhole monochromator of claim 9, wherein the first liquid supply tube, the second liquid supply tube, the first exhaust tube, the second exhaust tube and the pre-cooling tube all employ vacuum jacketed tubes; the joints of the phase separator, the first liquid supply pipe, the first exhaust pipe and the second liquid supply pipe are all welded.
12. A method of using a liquid nitrogen cooling system for a downhole monochromator, characterized in that the liquid nitrogen cooling system for a downhole monochromator according to any one of claims 8-10 is used and comprises the steps of:
s1: when the liquid nitrogen level in the phase separator is lower than a first preset liquid level, the first liquid level meter sends a monitoring signal to the control box, the control box controls the first electromagnetic valve and the second electromagnetic valve to be opened, liquid nitrogen is supplemented, nitrogen gas is discharged, and the first electromagnetic valve and the second electromagnetic valve are closed after the liquid level reaches a second preset liquid level;
s2: opening a third electromagnetic valve, supplying liquid nitrogen to the second liquid supply pipe, and simultaneously opening a first heating rod to maintain the pressure in the phase separator within a first preset pressure range;
s3: opening a fourth electromagnetic valve and a fifth electromagnetic valve, supplementing liquid nitrogen to a liquid nitrogen pool and a pressure stabilizing tank, and closing the fourth electromagnetic valve when the liquid level of the liquid nitrogen pool reaches a third preset liquid level; when the liquid level in the pressure stabilizing tank reaches a fifth preset liquid level, closing the fifth electromagnetic valve;
s4: starting a second heating rod, and maintaining the pressure in the pressure stabilizing tank within a second preset pressure range;
s5: and starting a liquid nitrogen pump to drive liquid nitrogen to circularly flow in the circulating pipeline, so that the monochromator is circularly refrigerated.
13. The method of using a liquid nitrogen cooling system for a downhole monochromator of claim 12, further comprising:
if the liquid level of the liquid nitrogen in the liquid nitrogen pool is lower than a fourth preset liquid level, the liquid level in the pressure stabilizing tank is lower than a sixth preset liquid level, and the step S3 is repeated;
after the circulation unit stops running, if the temperature of the thermometer is higher than the preset temperature, the eighth electromagnetic valve is opened;
and if the pressure in the pressure stabilizing tank is larger than the second preset pressure range, opening the sixth electromagnetic valve and the seventh electromagnetic valve.
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Application publication date: 20221104 |