CN114046441B - Automatic pressurization system for low-temperature liquefied gas - Google Patents

Automatic pressurization system for low-temperature liquefied gas Download PDF

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Publication number
CN114046441B
CN114046441B CN202111276150.1A CN202111276150A CN114046441B CN 114046441 B CN114046441 B CN 114046441B CN 202111276150 A CN202111276150 A CN 202111276150A CN 114046441 B CN114046441 B CN 114046441B
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China
Prior art keywords
booster pump
temperature
pump
switch valve
pressure
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CN202111276150.1A
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Chinese (zh)
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CN114046441A (en
Inventor
赵永文
黄丽丽
张若虎
张家林
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Jinan Huaxin Fluid Control Co ltd
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Jinan Huaxin Fluid Control Co ltd
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Publication of CN114046441A publication Critical patent/CN114046441A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/025—Special adaptations of indicating, measuring, or monitoring equipment having the pressure as the parameter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/026—Special adaptations of indicating, measuring, or monitoring equipment having the temperature as the parameter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/04—Arrangement or mounting of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/12—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/08—Pipe-line systems for liquids or viscous products
    • F17D1/082—Pipe-line systems for liquids or viscous products for cold fluids, e.g. liquefied gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/08—Pipe-line systems for liquids or viscous products
    • F17D1/14—Conveying liquids or viscous products by pumping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D3/00—Arrangements for supervising or controlling working operations
    • F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D5/00—Protection or supervision of installations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0135—Pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/04—Methods for emptying or filling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/04—Methods for emptying or filling
    • F17C2227/046—Methods for emptying or filling by even emptying or filling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/043—Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/0439—Temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

Abstract

The application relates to the technical field of pressurization of low-temperature liquefied gas, in particular to an automatic pressurization system of the low-temperature liquefied gas, which comprises a pressurization module, a vaporizer and a pre-cooling module, wherein the pressurization module comprises a booster pump and a pump pressure detection piece; when the booster pump works normally in a boosting mode, the first switch valve and the second switch valve are opened, and gas gasified through the gas return end enters the liquefied gas raw material tank to be supplemented, so that the pressure in the tank is maintained; when the temperature detected by the return air temperature detecting piece is higher than the set temperature, the booster pump stops working, at the moment, the second switch valve is closed, and the third switch valve is opened, so that automatic precooling is realized.

Description

Automatic pressurization system for low-temperature liquefied gas
Technical Field
The application relates to the technical field of low-temperature liquefied gas pressurization, in particular to an automatic low-temperature liquefied gas pressurization system.
Background
The prior process of filling the gas into the high-pressure gas cylinder adopts the technology that a low-temperature liquid booster pump is used for boosting the pressure of the low-temperature liquefied gas, then a vaporizer is used for vaporizing the low-temperature liquefied gas into a gaseous state, and then the gaseous state is filled into the high-pressure gas cylinder through the control of a valve group.
However, the pre-cooling, start-up and stop of the existing cryogenic liquid booster pump and the unloading after the pump are all manually operated, and the operation process is very complex, and a certain technical worker is required to operate.
Disclosure of Invention
The application aims to provide a device for solving the technical problems in the prior art.
In order to achieve the above purpose, the application adopts the technical scheme that the low-temperature liquefied gas automatic pressurization system comprises a pressurization module, a vaporizer and a precooling module, wherein the pressurization module comprises a booster pump and a pump pressure detection piece, the input end of the booster pump is connected with a liquefied gas raw material tank and is used for inputting liquefied gas raw materials, the output end of the booster pump outputs pressurized raw materials, and the pump pressure detection piece is arranged on a pipeline of the output end of the booster pump; when the pump pressure detection part detects that the pressure of the output end of the booster pump is smaller than the primary set pressure, the booster pump is started; when the pump pressure detection part detects that the pressure of the output end of the booster pump is larger than the second-level set pressure, the booster pump is stopped; the vaporizer is arranged at one side of the pressurizing module and is used for vaporizing the pressurized liquid; the precooling module is used for precooling the booster pump and comprises a return air temperature detection piece, wherein the booster pump is provided with a return air end, the return air end of the booster pump is connected with the top end of the liquefied gas raw material tank and discharges raw material gas into the tank, the pipeline of the input end of the booster pump is provided with a first switch valve, and the pipeline of the return air end of the booster pump is provided with a second switch valve, a third switch valve and a return air temperature detection piece; when the booster pump works normally in a boosting mode, the first switch valve and the second switch valve are opened, and gas gasified through the gas return end enters the liquefied gas raw material tank to be supplemented, so that the pressure in the tank is maintained; when the temperature detected by the return air temperature detecting piece is higher than the set temperature, the booster pump stops working, at the moment, the second switch valve is closed, and the third switch valve is opened, so that automatic precooling is realized.
Further, the booster pump also comprises a fourth switch valve, wherein the fourth switch valve is arranged on a pipeline at the output end of the booster pump; before the booster pump is started, the pressure value of the pipeline at the output end of the booster pump detected by the pump pressure detection part is higher than an initial set value, the fourth switch valve is opened to empty and reduce the pressure, and after the pressure is lower than the set value, the fourth switch valve is closed and the booster pump is started.
Further, the device also comprises a liquid cavitation temperature detection part, wherein the liquid cavitation temperature detection part is arranged on a pipeline at the output end of the booster pump, when the temperature detected by the liquid cavitation temperature detection part is higher than a set temperature, the booster pump stops working and gives an alarm to prompt, and at the moment, a fourth switch valve is opened to cool the booster pump; when the temperature detected by the liquid cavitation temperature detecting piece is lower than the set temperature, the fourth switch valve is closed, and the booster pump works normally.
Further, the hydraulic pump further comprises a hydraulic pressure detection part, the hydraulic pressure detection part is arranged on a pipeline at the output end of the booster pump, when the pressure detected by the hydraulic pressure detection part is higher than the set pressure, the booster pump stops working and gives an alarm, at the moment, the fourth switch valve is opened to reduce the pressure of the booster pump, and after the pressure is lower than the set value, the fourth switch valve is closed and the booster pump is started.
Further, the device also comprises a pump head sealing leakage temperature detection part, wherein the pump head sealing leakage temperature detection part is arranged on one side of the booster pump, and when the temperature detected by the pump head sealing leakage temperature detection part is lower than the set temperature, the booster pump stops working and gives an alarm for prompt.
Further, the automatic control device also comprises a transmission case oil temperature detection part, wherein the transmission case oil temperature detection part is arranged on one side of the booster pump, and when the temperature detected by the transmission case oil temperature detection part is higher than the set temperature, the booster pump stops working and gives an alarm for prompting.
Further, the device also comprises a gasification temperature detection part, wherein the gasification temperature detection part is arranged on a pipeline at the downstream of the carburetor, and when the temperature detected by the gasification temperature detection part is lower than the set temperature, the booster pump stops working and gives an alarm for prompting.
Further, the booster pump also comprises a PLC control module which is in communication connection with the upper computer and receives the working instruction of the upper computer and the change of parameters to adjust the rotating speed of the booster pump.
Further, the device also comprises a damper, wherein the damper is arranged on a pipeline at the output end of the booster pump and is used for stabilizing the pressurized output liquid.
The application has the beneficial effects that:
1. the automatic pre-cooling, starting and stopping of the low-temperature liquid booster pump and the speed regulation of the booster pump are realized, the operation flow is simplified, the phenomenon that workers run at two ends in the filling process is avoided, and the standard management in the high-pressure gas cylinder filling process is facilitated.
2. The detection and protection functions of the booster pump are increased, the safe operation of production is guaranteed, and the service life of the booster pump is prolonged.
3. Technical requirements on operators are reduced, recruitment and training of factory personnel are facilitated, and accordingly running cost of the factory is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present application, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic overall flow chart of an automatic low-temperature liquefied gas pressurizing system according to an embodiment of the present application.
Reference numerals illustrate:
1. a booster pump; 2. a pump pressure detecting member; 3. a liquefied gas raw material tank; 4. an air return temperature detecting member; 5. a first switching valve; 6. a second switching valve; 7. a third switching valve; 8. a fourth switching valve; 9. a liquid cavitation temperature detecting member; 10. a liquid outlet pressure detecting member; 11. a pump head seal leakage temperature detection member; 12. the transmission case oil temperature detection piece; 13. a gasification temperature detecting member; 14. a vaporizer; 15. a damper.
Detailed Description
The following description of the embodiments of the present application will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the application are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present application described below may be combined with each other as long as they do not collide with each other.
Referring to fig. 1, as an embodiment of the present application, a low-temperature liquefied gas automatic pressurizing system includes a pressurizing module, a vaporizer 14, and a pre-cooling module, where the pressurizing module includes a pressurizing pump 1 and a pump pressure detecting element 2, an input end of the pressurizing pump 1 is connected to a liquefied gas raw material tank 3 and is used for inputting liquefied gas raw materials, an output end of the pressurizing pump 1 outputs pressurized raw materials, and the pump pressure detecting element 2 is disposed on a pipeline of an output end of the pressurizing pump 1; when the pump pressure detection part 2 detects that the pressure of the output end of the booster pump 1 is smaller than the primary set pressure, the booster pump 1 is started; when the pump pressure detection part 2 detects that the output end pressure of the booster pump 1 is larger than the secondary set pressure, the booster pump 1 stops; the vaporizer 14 is arranged at one side of the pressurizing module and vaporizes the pressurized liquid; the precooling module is used for precooling the booster pump 1 and comprises an air return temperature detection piece 4, an air return end is arranged on the booster pump 1, the air return end of the booster pump 1 is connected with the top end of the liquefied gas raw material tank 3 and discharges raw material gas into the tank, a first switch valve 5 is arranged on an input end pipeline of the booster pump 1, and a second switch valve 6, a third switch valve 7 and the air return temperature detection piece 4 are arranged on an air return end pipeline of the booster pump 1; when the booster pump 1 works normally in a boosting mode, the first switch valve 5 and the second switch valve 6 are opened, and gas gasified through the gas return end enters the liquefied gas raw material tank 3 to be supplemented, so that the pressure in the tank is maintained; when the temperature detected by the air return temperature detecting piece 4 is higher than the set temperature, the booster pump 1 stops working, at the moment, the second switch valve 6 is closed, the third switch valve 7 is opened, and automatic precooling is realized.
Further, the automatic low-temperature liquefied gas pressurizing system further comprises a fourth switch valve 8, and the fourth switch valve 8 is arranged on a pipeline at the output end of the pressurizing pump 1; before the booster pump 1 is started, the pressure value of the pipeline at the output end of the booster pump 1 detected by the pump pressure detection part 2 is higher than an initial set value, the fourth switch valve 8 is opened to empty and reduce the pressure, and after the pressure is lower than the set value, the fourth switch valve 8 is closed and the booster pump 1 is started.
Further, the low-temperature liquefied gas automatic pressurizing system further comprises a liquid-liquid cavitation temperature detection part 9, wherein the liquid-liquid cavitation temperature detection part 9 is arranged on a pipeline at the output end of the booster pump 1, when the temperature detected by the liquid-liquid cavitation temperature detection part 9 is higher than a set temperature, the booster pump 1 stops working and gives an alarm to prompt, and at the moment, the fourth switch valve 8 is opened to cool the booster pump; when the temperature detected by the liquid cavitation temperature detecting member 9 is lower than the set temperature, the fourth switch valve 8 is closed, and the booster pump 1 works normally.
Further, the automatic low-temperature liquefied gas pressurizing system further comprises a liquid outlet pressure detecting part 10, the liquid outlet pressure detecting part 10 is arranged on a pipeline of the output end of the booster pump 1, when the pressure detected by the liquid outlet pressure detecting part 10 is higher than the set pressure, the booster pump 1 stops working and gives an alarm, at the moment, the fourth switch valve 8 is opened to reduce the pressure of the increased pump, and after the pressure is lower than the set value, the fourth switch valve 8 is closed and the booster pump 1 is started.
Further, the automatic low-temperature liquefied gas pressurizing system further comprises a pump head sealing leakage temperature detecting piece 11, the pump head sealing leakage temperature detecting piece 11 is arranged on one side of the booster pump 1, and when the temperature detected by the pump head sealing leakage temperature detecting piece 11 is lower than the set temperature, the booster pump 1 stops working and gives an alarm for prompt.
Further, the automatic low-temperature liquefied gas pressurizing system further comprises a transmission case oil temperature detecting member 12, the transmission case oil temperature detecting member 12 is arranged on one side of the booster pump 1, and when the temperature detected by the transmission case oil temperature detecting member 12 is higher than the set temperature, the booster pump 1 stops working and gives an alarm for prompting.
Further, the automatic low-temperature liquefied gas pressurizing system further comprises a gasification temperature detecting piece 13, the gasification temperature detecting piece 13 is arranged on a pipeline at the downstream of the vaporizer 14, and when the temperature detected by the gasification temperature detecting piece 13 is lower than the set temperature, the booster pump 1 stops working and gives an alarm for prompt.
Further, the automatic low-temperature liquefied gas pressurizing system also comprises a PLC control module, wherein the PLC control module is in communication connection with the upper computer and receives the working instruction of the upper computer and the change of parameters to adjust the rotating speed of the pressurizing pump 1.
Further, the low-temperature liquefied gas automatic pressurization system further comprises a damper 15, wherein the damper 15 is arranged on a pipeline at the output end of the booster pump 1 and is used for stabilizing the pressurized output liquid.
By adopting the automatic pressurization system for the low-temperature liquefied gas, the automatic precooling, starting and stopping of the low-temperature liquid booster pump 1 and the speed regulation of the booster pump 1 are realized, the operation flow is simplified, the phenomenon that workers run at two ends in the filling process is avoided, and the standard management in the high-pressure gas cylinder filling process is facilitated. Technical requirements on operators are reduced, recruitment and training of factory personnel are facilitated, and accordingly running cost of the factory is reduced. Through increasing the detection and protection functions of the booster pump 1, the safe operation of production is ensured, and the service life of the booster pump 1 is prolonged.
The working flow of the low-temperature liquefied gas automatic pressurizing system in the application is as follows:
after the power is turned on, the first switch valve 5 and the second switch valve 6 are opened, before the booster pump 1 is started, the pressure value of the output end pipeline of the booster pump 1 detected by the pump pressure detecting piece 2 is higher than an initial set value, the fourth switch valve 8 is opened to empty and reduce the pressure, and after the pressure is lower than the set value, the fourth switch valve 8 is closed and the booster pump 1 is started. At this time, the booster pump 1 works normally in a boosting mode, and the gas gasified by the gas return end enters the liquefied gas raw material tank 3 for supplementing, so that the pressure in the tank is maintained. When the pump pressure detection part 2 detects that the pressure of the output end of the booster pump 1 is smaller than the primary set pressure, the booster pump 1 is started; when the pump pressure detection part 2 detects that the pressure of the output end of the booster pump 1 is larger than the secondary set pressure, the booster pump 1 stops;
when the return air temperature detection part 4 detects that the temperature is higher than-150 ℃, the booster pump 1 stops working, the third switch valve 7 is opened in a pulse mode, and meanwhile, the second switch valve 6 is closed, so that automatic precooling is realized. When the temperature detected by the return air temperature detecting piece 4 is lower than-160 ℃, the first switch valve 5 and the second switch valve 6 are opened, the third switch valve 7 is closed, and the supercharging process is restored again;
when the temperature detected by the liquid cavitation temperature detection part 9 is higher than-120 ℃, the booster pump 1 stops working, gives an alarm and prompts, and opens the fourth switch valve 8 in a pulse mode to cool the booster pump; when the temperature detected by the liquid cavitation temperature detecting piece 9 is lower than minus 130 ℃, the fourth switch valve 8 is closed, and the booster pump 1 works normally;
when the pressure detected by the liquid outlet pressure detecting piece 10 is higher than the set pressure, the booster pump 1 stops working and gives an alarm to prompt, at the moment, the fourth switch valve 8 is opened to reduce the pressure of the added pump, and after the pressure is lower than the set pressure, the fourth switch valve 8 is closed and the booster pump 1 is started;
when the temperature detected by the pump head sealing leakage temperature detecting piece 11 is lower than the set temperature, the booster pump 1 stops working and gives an alarm and prompts;
when the temperature detected by the transmission case oil temperature detection piece 12 is higher than 60 ℃, the booster pump 1 stops working and gives an alarm and prompts;
when the motor belt cover of the booster pump 1 is opened, the motor can not be started, and an alarm prompt is given;
when the temperature detected by the gasification temperature detecting member 13 is lower than the set temperature, the booster pump 1 stops working and gives an alarm.
The embodiments of the present application are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in this way, therefore: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.

Claims (6)

1. An automatic pressurization system for low-temperature liquefied gas, comprising:
the pressurizing module comprises a pressurizing pump (1) and a pump pressure detecting piece (2), wherein the input end of the pressurizing pump (1) is connected with a liquefied gas raw material tank (3) and is used for inputting liquefied gas raw materials, the output end of the pressurizing pump (1) outputs pressurized raw materials, and the pump pressure detecting piece (2) is arranged on a pipeline of the output end of the pressurizing pump (1); when the pump pressure detection piece (2) detects that the output end pressure of the booster pump (1) is smaller than the primary set pressure, the booster pump (1) is started; when the pump pressure detection part (2) detects that the output end pressure of the booster pump (1) is larger than the secondary set pressure, the booster pump (1) is stopped;
a vaporizer (14) provided on one side of the pressurizing module for vaporizing the pressurized liquid;
the precooling module is used for precooling the booster pump (1) and comprises a return air temperature detection piece (4), wherein the return air end is arranged on the booster pump (1), the return air end of the booster pump (1) is connected with the top end of the liquefied gas raw material tank (3) and discharges raw material gas into the tank, a first switch valve (5) is arranged on an input end pipeline of the booster pump (1), and a second switch valve (6), a third switch valve (7) and the return air temperature detection piece (4) are arranged on a return air end pipeline of the booster pump (1); when the booster pump (1) works normally in a boosting mode, the first switch valve (5) and the second switch valve (6) are opened, and gas gasified through the gas return end enters the liquefied gas raw material tank (3) to be supplemented, so that the pressure in the tank is maintained; when the temperature detected by the return air temperature detecting piece (4) is higher than the set temperature, the booster pump (1) stops working, at the moment, the second switch valve (6) is closed, and the third switch valve (7) is opened, so that automatic precooling is realized;
the device also comprises a fourth switch valve (8), wherein the fourth switch valve (8) is arranged on a pipeline of the output end of the booster pump (1); before the booster pump (1) is started, if the pressure value of the pipeline at the output end of the booster pump (1) detected by the pump pressure detecting piece (2) is higher than an initial set value, a fourth switch valve (8) is opened to empty the booster pump, the fourth switch valve (8) is closed and the booster pump (1) is started after the pressure is lower than the set value;
the device also comprises a liquid cavitation temperature detection part (9), wherein the liquid cavitation temperature detection part (9) is arranged on a pipeline at the output end of the booster pump (1), when the temperature detected by the liquid cavitation temperature detection part (9) is higher than a set temperature, the booster pump (1) stops working and gives an alarm to prompt, and at the moment, a fourth switch valve (8) is opened to cool the booster pump; when the temperature detected by the liquid cavitation temperature detection piece (9) is lower than the set temperature, the fourth switch valve (8) is closed, and the booster pump (1) works normally;
the hydraulic pressure control device is characterized by further comprising a hydraulic pressure detection part (10), wherein the hydraulic pressure detection part (10) is arranged on a pipeline at the output end of the booster pump (1), when the pressure detected by the hydraulic pressure detection part (10) is higher than a set pressure, the booster pump (1) stops working and gives an alarm, at the moment, the fourth switch valve (8) is opened to reduce the pressure of the booster pump, and after the pressure is lower than the set value, the fourth switch valve (8) is closed and the booster pump (1) is started.
2. The automatic low-temperature liquefied gas pressurizing system according to claim 1, further comprising a pump head sealing leakage temperature detection member (11), wherein the pump head sealing leakage temperature detection member (11) is arranged on one side of the booster pump (1), and when the temperature detected by the pump head sealing leakage temperature detection member (11) is lower than the set temperature, the booster pump (1) stops working and gives an alarm and prompts.
3. The automatic low-temperature liquefied gas pressurizing system according to claim 1, further comprising a transmission case oil temperature detecting member (12), wherein the transmission case oil temperature detecting member (12) is arranged on one side of the booster pump (1), and when the temperature detected by the transmission case oil temperature detecting member (12) is higher than the set temperature, the booster pump (1) stops working and gives an alarm.
4. The automatic pressurization system for the low-temperature liquefied gas according to claim 1, further comprising a gasification temperature detection member (13), wherein the gasification temperature detection member (13) is arranged on a pipeline downstream of the vaporizer (14), and when the temperature detected by the gasification temperature detection member (13) is lower than a set temperature, the booster pump (1) stops working and gives an alarm.
5. The automatic low-temperature liquefied gas pressurizing system according to claim 1, further comprising a PLC control module, wherein the PLC control module is in communication connection with the upper computer and receives the upper computer working instruction and parameter change to adjust the rotating speed of the pressurizing pump (1).
6. The automatic pressurization system for the low-temperature liquefied gas according to claim 1, further comprising a damper (15), wherein the damper (15) is arranged on a pipeline at the output end of the booster pump (1) and stabilizes the pressurized output liquid.
CN202111276150.1A 2021-10-29 2021-10-29 Automatic pressurization system for low-temperature liquefied gas Active CN114046441B (en)

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