CN212338923U - Automatic pressurized cryogenic liquid delivery device - Google Patents
Automatic pressurized cryogenic liquid delivery device Download PDFInfo
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- CN212338923U CN212338923U CN202020752908.9U CN202020752908U CN212338923U CN 212338923 U CN212338923 U CN 212338923U CN 202020752908 U CN202020752908 U CN 202020752908U CN 212338923 U CN212338923 U CN 212338923U
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Abstract
The utility model discloses an automatic pressurized cryogenic liquid delivery device, which comprises a liquid inlet pipe, a measuring cylinder, a liquid outlet pipe, an automatic pressurizer, a pressurizing connecting pipe, a pressurizing pipe, a storage tank and a control system; the measuring cylinder is connected with the fractionating tower through a liquid inlet pipe and is connected with a liquid inlet of the storage tank through a liquid outlet pipe; the self-pressurizer is connected with the liquid outlet pipe through a pressurizing connecting pipe, and the outlet is connected with the measuring cylinder through a pressurizing pipe; the control system comprises a central processing module, a first regulating valve, a second regulating valve, a third regulating valve, a liquid level meter, a first pressure gauge and a second pressure gauge; the liquid level meter, the first pressure gauge and the second pressure gauge are respectively connected with the signal input end of the central processing module; the control signal output end of the central processing module is respectively connected with the first regulating valve, the second regulating valve and the third regulating valve, low-temperature liquid in the measuring cylinder is led into the self-pressurization mechanism for vaporization, pressurized gas is led into the measuring cylinder, and therefore pressure in the measuring cylinder is improved, and liquid in the measuring cylinder is smoothly sent into the storage tank.
Description
Technical Field
The utility model relates to an air separation technical field especially relates to an automatic cryogenic liquids of pressure boost send out device.
Background
At present, with the development of social economy, in recent years, the application field of the air separation equipment is continuously expanded, and industries such as petrifaction, glass, rubber, building, carbon fiber and the like are involved. The requirement of enterprises on air separation equipment is continuously improved, and higher requirements on the stability and operability of the air separation system are provided.
The low-temperature liquid sending means that the low-temperature liquid in the distillation tower is sent to a measuring cylinder, the measuring cylinder is positioned in a cold insulation box, and the liquid in the measuring cylinder is sent to a storage tank.
In the conventional cryogenic liquid discharge process, when the pressure of the canister is lower than the pressure of the storage tank, the cryogenic liquid cannot be normally discharged to the storage tank, and in order to solve the problem, the cryogenic liquid needs to be pressurized.
In the existing low-temperature liquid pressurization mode, a booster pump is generally arranged on a liquid outlet pipe communicated between a measuring cylinder and a storage tank to meet the requirement of sending low-temperature liquid; however, because the booster pump needs to be cooled by the low-temperature liquid when being started, and the booster pump can be started to operate only when reaching the corresponding temperature, a large amount of low-temperature liquid is inevitably gasified, so that energy loss is too much, the capacity of the measuring cylinder is not large due to the limited space in the air separation cold insulation box, and particularly when the delivery amount of the low-temperature liquid is small, the liquid in the measuring cylinder is completely gasified, the booster pump still does not reach the starting temperature, the booster pump cannot be started, and the low-temperature liquid cannot be delivered.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an automatic cryogenic liquids of pressure boost send out device can need not the booster pump and can realize sending out smoothly of cryogenic liquids, avoids a large amount of vaporization of cryogenic liquids, reduces energy loss.
The utility model adopts the technical proposal that:
an automatic pressurized cryogenic liquid delivery device comprises a liquid inlet pipe, a measuring cylinder, a liquid outlet pipe, a self-pressurizing device, a pressurizing connecting pipe, a pressurizing pipe, a storage tank and a control system;
the liquid inlet of the measuring cylinder is connected with the liquid outlet of the fractionating tower through a liquid inlet pipe, and the liquid outlet of the measuring cylinder is connected with the liquid inlet of the storage tank through a liquid outlet pipe;
the inlet of the self-pressurizer is connected with the pressurizing outlet of the liquid outlet pipe through a pressurizing connecting pipe, and the outlet of the self-pressurizer is connected with the pressurizing port of the measuring cylinder through a pressurizing pipe;
the control system comprises an adjusting execution mechanism, a detection mechanism and a central processing module; the adjusting and executing mechanism comprises a first adjusting valve, a second adjusting valve and a third adjusting valve; the detection mechanism comprises a liquid level meter for measuring the liquid level in the measuring cylinder, a first pressure meter for detecting the pressure in the measuring cylinder and a second pressure meter for detecting the pressure in the storage tank; the first regulating valve is arranged on the liquid inlet pipe, the second regulating valve is arranged on the liquid outlet pipe, and the third regulating valve is arranged on the pressurization connecting pipe;
the signal output ends of the liquid level meter, the first pressure gauge and the second pressure gauge are respectively connected with the signal input end of the central processing module; and the control signal output end of the central processing module is respectively connected with the control input ends of the first regulating valve, the second regulating valve and the third regulating valve.
The central processing module adopts a PLC.
And a safety valve is arranged at the safety outlet of the pressure increasing pipe.
And a manual discharge valve is arranged at the discharge outlet of the liquid outlet pipe.
The self-pressurizing device adopts an air bath type vaporizer.
The low-temperature liquid delivery device, compared with the conventional device, reduces the rotating equipment such as booster pumps, increases the self-pressurizer, delivers the liquid in the measuring cylinder to the self-pressurizer according to the principle of a communicating vessel, gasifies the low-temperature liquid entering the self-pressurizer by utilizing the natural environment temperature, delivers the generated pressurized gas to the measuring cylinder, and improves the pressure in the measuring cylinder, thereby achieving the requirement of automatically delivering the low-temperature liquid, avoiding the loss of a large amount of liquid caused by cooling the pressurized liquid pump, reducing the power consumption, saving the equipment investment, saving the delivery time of the low-temperature liquid to a great extent, and meeting the current national requirement of energy conservation and emission reduction on industrial equipment; the defects that the booster pump cannot be started and the low-temperature liquid cannot be sent out are overcome, and meanwhile, the whole device is completely and automatically controlled by the control system, so that the stability of the system is greatly improved, and the operation is more convenient.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic circuit diagram of the control system of the present invention;
1. a cold insulation box; 2. a fractionating column; 3. a liquid inlet pipe; 4. a measuring cylinder; 5. a liquid outlet pipe; 6. a self-pressurizing unit; 7. pressurizing connecting pipes; 8. a pressure increasing pipe; 9. a storage tank; 10. a first regulating valve; 11. a second regulating valve; 12. a third regulating valve; 13. a first pressure gauge; 14. a second pressure gauge; 15. a liquid level meter; 16. a safety valve; 17. a manual drain valve.
Detailed Description
As shown in fig. 1 and 2, the automatic pressurizing cryogenic liquid delivery device of the present invention includes a liquid inlet pipe 3, a measuring cylinder 4, a liquid outlet pipe 5, a self-pressurizing device 6, a pressurizing connecting pipe 7, a pressurizing pipe 8, a storage tank 9 and a control system; the measuring cylinder 4 is positioned in the air separation cold insulation box 1; the self-pressurizing unit 6 is located in the natural environment.
The liquid inlet of the measuring cylinder 4 is connected with the liquid outlet of the fractionating tower 2 through a liquid inlet pipe 3, and the liquid outlet of the measuring cylinder 4 is connected with the liquid inlet of the storage tank 9 through a liquid outlet pipe 5;
the inlet of the self-pressurizer 6 is connected with the pressurizing outlet of the liquid outlet pipe 5 through a pressurizing connecting pipe 7, and the outlet of the self-pressurizer 6 is connected with the pressurizing port of the measuring cylinder 4 through a pressurizing pipe 8;
the control system comprises an adjusting execution mechanism, a detection mechanism and a central processing module; the adjusting and executing mechanism comprises a first adjusting valve 10, a second adjusting valve 11 and a third adjusting valve 12; the detection mechanism comprises a liquid level meter 15 for measuring the liquid level in the cylinder 4, a first pressure gauge 13 for detecting the pressure in the cylinder 4 and a second pressure gauge 14 for detecting the pressure in the storage tank 9; the first regulating valve 10 is arranged on the liquid inlet pipe 3, the second regulating valve 11 is arranged on the liquid outlet pipe 5, and the third regulating valve 12 is arranged on the pressurization connecting pipe 7;
the signal output ends of the liquid level meter 15, the first pressure gauge 13 and the second pressure gauge 14 are respectively connected with the signal input end of the central processing module; the control signal output end of the central processing module is respectively connected with the control input ends of the first regulating valve 10, the second regulating valve 11 and the third regulating valve 12.
The dashed lines in fig. 1 represent control cables.
In this embodiment, the central processing module adopts a PLC. The self-pressurizing device 6 adopts an air bath type vaporizer.
The working process of the utility model is as follows:
the liquid inlet process of the measuring cylinder 4 is as follows: the PLC controls the first regulating valve 10 to be opened and the second regulating valve 11 and the third regulating valve 12 to be closed.
In the air separation cold insulation box 1, the low-temperature liquid from the fractionation column 2 is sent to the measuring cylinder 4 through the first regulating valve 10. In the process, flash steam generated by the measuring cylinder 4 can be further sent back to the fractionating tower 2 by a gas return mechanism to avoid resource waste,
the liquid level meter 15 collects the liquid level in the measuring cylinder 4 and transmits the collected liquid level signal to the PLC. The PLC is provided with a liquid level upper limit value and a liquid level lower limit value, processes the received liquid level height signal to obtain the real-time liquid level height in the measuring cylinder 4, and compares the real-time liquid level height with the set liquid level upper limit value.
When the real-time liquid level in the measuring cylinder 4 reaches the upper limit value of the liquid level, the electromagnetic valve of the first regulating valve 10 is powered off, and the valve is closed; the liquid inlet process of the measuring cylinder 4 is finished.
Meanwhile, the second regulating valve 11 is electrified, the valve is opened, and the measuring cylinder 4 begins to discharge liquid; the liquid in the measuring cylinder 4 enters the storage tank 9 through the liquid outlet pipe 5.
The first pressure gauge 13 obtains the pressure in the measuring cylinder 4, the second pressure gauge 14 obtains the pressure in the storage tank 9, the obtained pressure signal is transmitted to the PLC, the pressure in the measuring cylinder 4 is compared with the pressure in the storage tank 9, when the pressure in the measuring cylinder 4 is smaller than or equal to the pressure in the storage tank 9, the third regulating valve 12 is electrified, the valve is opened, the low-temperature liquid in the liquid outlet pipe 5 (namely the low-temperature liquid in the measuring cylinder 4) is led into the air bath type vaporizer based on the principle of a communicating vessel, the air bath type vaporizer vaporizes the led low-temperature liquid to generate pressurized gas, and the pressurized gas is led into the measuring cylinder 4 to increase the pressure in the measuring cylinder 4, the pressure in the measuring cylinder 4 is larger than the pressure in the storage tank 9, so that the requirement that the low-temperature liquid is sent into the storage tank 9 through the liquid outlet pipe 5 is met.
When the pressure in the measuring cylinder 4 is greater than the pressure in the reservoir 9, acquiring a pressure difference between the pressure in the measuring cylinder 4 and the pressure in the reservoir 9; and regulating the speed of the low-temperature liquid fed into the self-pressurization mechanism according to the pressure difference.
Setting n pressure difference value range intervals in the PLC: the range interval is 1, the range interval is 2 …, the range interval is i …, the range interval is n, i is more than or equal to 1 and is less than or equal to n; setting the opening degree of the regulating valve corresponding to the n pressure difference value range intervals one by one: the opening degree of the regulating valve is 1, the opening degree of the regulating valve is 2 …, the opening degree of the regulating valve is i …, and the opening degree of the regulating valve is n;
when the pressure difference value falls into the range section i, the PLC controls the opening degree of the corresponding third regulating valve 12 to be the regulating valve opening degree i. Thereby automatically adjusting the speed of the low-temperature liquid introduced into the self-pressurization mechanism, realizing the pressure control in the measuring cylinder 4, avoiding overlarge pressure, avoiding vaporizing too much low-temperature liquid, realizing the reasonable utilization of resources and avoiding the overpressure in the measuring cylinder 4.
When the real-time liquid level of the graduated cylinder 4 is reduced to the lower limit value of the liquid level, the electromagnetic valves of the second regulating valve 11 and the third regulating valve 12 lose power, the valves are closed, the liquid feeding process of the graduated cylinder 4 is finished, meanwhile, the electromagnetic valve of the first regulating valve 10 is powered on, the valves are opened, the liquid generated by the fractionating tower 2 is fed into the graduated cylinder 4, and the liquid feeding process of the graduated cylinder 4 starts again.
The whole device is completely automatically controlled by the control system, and the stability and operability of the system are greatly improved.
In this embodiment, the safety outlet of the pressure inlet 8 is provided with a safety valve 16 for protection when the device is over-pressurized. In specific implementation, a safety outlet can be formed in the upper side wall of the pressure increasing pipe 8, a pressure relief valve is arranged, and when the pressure of the pressure increasing pipe 8 reaches a certain value, the pressure relief valve is automatically opened to discharge gas, so that the pressure in the whole device is reduced, and overpressure protection is realized.
The discharge opening of said outlet pipe 5 is provided with a manual discharge valve 17 for discharging liquid when necessary for the device.
Low temperature liquid send out device, compare with traditional device and reduced rotating equipment such as booster pump, increased from booster 6 and control system, liquid according to the linker principle in with graduated flask 4 is sent to from booster 6, utilize the low temperature liquid gasification that natural environment temperature will get into from booster 6, send the pressurized gas who produces to graduated flask 4 in, improve graduated flask 4 internal pressure, thereby reach the automatic requirement of sending out of low temperature liquid, avoid causing a large amount of liquid losses because of cooling booster liquid pump, power consumption has been reduced, and the sending-out time of low temperature liquid has been practiced thrift to a great extent, accord with the present requirement to industrial equipment energy saving and emission reduction of country, the whole equipment is by control system automatic control completely simultaneously, the stability of system has been improved greatly, be convenient for more the operation.
Particularly, when the output of the low-temperature liquid is small, the low-temperature liquid can be more smoothly output, and the situations that the liquid in the measuring cylinder 4 is completely gasified, the booster pump still does not reach the starting temperature, the booster pump cannot be started, and the low-temperature liquid cannot be output can not occur.
Claims (5)
1. An automatic pressurized cryogenic liquid delivery device, characterized in that: comprises a liquid inlet pipe, a measuring cylinder, a liquid outlet pipe, a self-pressurizer, a pressurizing connecting pipe, a pressurizing pipe, a storage tank and a control system;
the liquid inlet of the measuring cylinder is connected with the liquid outlet of the fractionating tower through a liquid inlet pipe, and the liquid outlet of the measuring cylinder is connected with the liquid inlet of the storage tank through a liquid outlet pipe;
the inlet of the self-pressurizer is connected with the pressurizing outlet of the liquid outlet pipe through a pressurizing connecting pipe, and the outlet of the self-pressurizer is connected with the pressurizing port of the measuring cylinder through a pressurizing pipe;
the control system comprises an adjusting execution mechanism, a detection mechanism and a central processing module; the adjusting and executing mechanism comprises a first adjusting valve, a second adjusting valve and a third adjusting valve; the detection mechanism comprises a liquid level meter for measuring the liquid level in the measuring cylinder, a first pressure meter for detecting the pressure in the measuring cylinder and a second pressure meter for detecting the pressure in the storage tank; the first regulating valve is arranged on the liquid inlet pipe, the second regulating valve is arranged on the liquid outlet pipe, and the third regulating valve is arranged on the pressurization connecting pipe;
the signal output ends of the liquid level meter, the first pressure gauge and the second pressure gauge are respectively connected with the signal input end of the central processing module; and the control signal output end of the central processing module is respectively connected with the control input ends of the first regulating valve, the second regulating valve and the third regulating valve.
2. The automatically pressurized cryogenic liquid delivery device of claim 1, wherein: the central processing module adopts a PLC.
3. The automatically pressurized cryogenic liquid delivery device of claim 2, wherein: and a safety valve is arranged at the safety outlet of the pressure increasing pipe.
4. The automatically pressurized cryogenic liquid delivery device of claim 3, wherein: and a manual discharge valve is arranged at the discharge outlet of the liquid outlet pipe.
5. The automatically pressurized cryogenic liquid delivery device of claim 4, wherein: the self-pressurizing device adopts an air bath type vaporizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020752908.9U CN212338923U (en) | 2020-05-09 | 2020-05-09 | Automatic pressurized cryogenic liquid delivery device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020752908.9U CN212338923U (en) | 2020-05-09 | 2020-05-09 | Automatic pressurized cryogenic liquid delivery device |
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| Publication Number | Publication Date |
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| CN212338923U true CN212338923U (en) | 2021-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020752908.9U Active CN212338923U (en) | 2020-05-09 | 2020-05-09 | Automatic pressurized cryogenic liquid delivery device |
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| CN (1) | CN212338923U (en) |
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2020
- 2020-05-09 CN CN202020752908.9U patent/CN212338923U/en active Active
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