CN114659020B

CN114659020B - Liquid nitrogen equipment and control method thereof

Info

Publication number: CN114659020B
Application number: CN202210279161.3A
Authority: CN
Inventors: 袁圣杰; 张文明; 连开武; 邵明琦; 姜崇刚; 刘均
Original assignee: Yantai Jereh Petroleum Equipment and Technologies Co Ltd
Current assignee: Yantai Jereh Petroleum Equipment and Technologies Co Ltd
Priority date: 2022-03-21
Filing date: 2022-03-21
Publication date: 2023-08-25
Anticipated expiration: 2042-03-21
Also published as: CN114659020A

Abstract

The embodiment of the application discloses liquid nitrogen equipment and a control method thereof, relates to the technical field of oilfield yield increasing operation wells, and is used for realizing intelligent control of the liquid nitrogen equipment so as to reduce the operation difficulty of the liquid nitrogen equipment. The liquid nitrogen device comprises: a storage tank; the first liquid inlet valve is communicated with the bottom of the storage tank through a first liquid inlet pipeline; the second liquid inlet valve is communicated with the top of the storage tank through a second liquid inlet pipeline; the first temperature sensor is arranged in the storage tank and is used for detecting the temperature value in the storage tank; and a controller configured to: when liquid nitrogen equipment needs to be filled, a first temperature value of the interior of the storage tank at a first moment is obtained through a first temperature sensor; if the first temperature value is smaller than or equal to the first temperature threshold value, controlling the first liquid inlet valve to be opened; or if the first temperature value is greater than the first temperature threshold value, controlling the second liquid inlet valve to be opened.

Description

Liquid nitrogen equipment and control method thereof

Technical Field

The application relates to the technical field of oilfield yield increase operation wells, in particular to liquid nitrogen equipment and a control method thereof.

Background

The working medium of the liquid nitrogen equipment is low-temperature liquid-liquid nitrogen, the temperature of the liquid nitrogen can reach-196 ℃, the liquid nitrogen is greatly influenced by the temperature in the working process of the liquid nitrogen equipment, and the vaporization phenomenon is easy to occur, so that the structures of a liquid nitrogen tank and an accessory pipeline of the liquid nitrogen equipment are complex.

At present, operations such as liquid supply of a liquid nitrogen tank and the like require an operator to manually control the valve, and because the operations such as liquid filling of the liquid nitrogen tank and the like relate to a plurality of control flows, the control operation process is complex, the operation level requirement on the operator is high, and meanwhile, the risk of large teaching of misoperation exists. Therefore, how to realize the automatic control of the liquid nitrogen equipment to reduce the operation difficulty of the liquid nitrogen equipment is a problem to be solved.

Disclosure of Invention

The embodiment of the application provides liquid nitrogen equipment and a control method thereof, which are used for realizing intelligent control of the liquid nitrogen equipment so as to reduce the operation difficulty of the liquid nitrogen equipment.

In a first aspect, there is provided a liquid nitrogen apparatus comprising:

a storage tank;

the first liquid inlet valve is connected with the bottom of the storage tank through a first liquid inlet pipeline;

the second liquid inlet valve is connected with the top of the storage tank through a second liquid inlet pipeline;

the first temperature sensor is arranged in the storage tank and is used for detecting the temperature value in the storage tank; the method comprises the steps of,

a controller configured to:

when liquid nitrogen equipment needs to be filled, a first temperature value of the interior of the storage tank at a first moment is obtained through a first temperature sensor;

if the first temperature value is smaller than or equal to the first temperature threshold value, controlling the first liquid inlet valve to be opened; or alternatively, the process may be performed,

And if the first temperature value is greater than the first temperature threshold value, controlling the second liquid inlet valve to be opened.

The technical scheme provided by the embodiment of the application at least has the following beneficial effects: when the liquid nitrogen equipment needs to be filled, a controller of the liquid nitrogen equipment is used for controlling the liquid nitrogen equipment according to a first temperature value of the interior of the storage tank at a first moment. If the first temperature value is smaller than or equal to the first temperature threshold value, the temperature value inside the storage tank is proper at the first moment, and in order to reduce the gasification amount of the liquid nitrogen entering the storage tank, a first liquid inlet valve positioned at the bottom of the storage tank can be controlled to be opened, so that the liquid nitrogen enters the storage tank from the bottom of the storage tank. If the first temperature value is greater than the first temperature threshold value, the temperature value inside the storage tank is higher at the first moment, and the liquid nitrogen entering the storage tank cannot be well kept at the temperature, so that the second liquid inlet valve at the top of the storage tank can be controlled to be opened, the liquid nitrogen enters the storage tank from the top of the storage tank, and the cooling effect of the storage tank is achieved. Therefore, the control method of the liquid nitrogen equipment provided by the embodiment of the application can realize automatic liquid charging of the liquid nitrogen equipment, realize automatic control of the liquid nitrogen equipment, reduce the operation difficulty of the liquid nitrogen equipment and promote the experience of operators. In addition, in the control method of the liquid nitrogen equipment, in the automatic liquid filling process of the liquid nitrogen equipment, the influence of the temperature value in the storage tank on the temperature of liquid nitrogen to be fed into the storage tank is combined, and the controller is adopted to control different liquid inlet valves to be opened under different conditions according to the temperature value in the storage tank, so that the rationality of the liquid inlet mode of the liquid nitrogen equipment is improved.

In some embodiments, the controller, after controlling the second inlet valve to open, is further configured to: acquiring a second temperature value of the interior of the storage tank at a second moment through the first temperature sensor, wherein the second moment is positioned after the first moment; and if the second temperature value is smaller than or equal to the first temperature threshold value, controlling the second liquid inlet valve to be closed and controlling the first liquid inlet valve to be opened.

In some embodiments, the liquid nitrogen apparatus further comprises: the full-measuring valve is connected with the top of the storage tank through a full-measuring pipeline; the second temperature sensor is arranged on the full-filling pipeline and is used for detecting the temperature value of the full-filling pipeline; and a controller further configured to: the opening of the full-measuring valve is controlled while the opening of the first liquid inlet valve is controlled; after the full-measuring valve is opened, acquiring a temperature value of a full-measuring pipeline through a second temperature sensor; and when the temperature value of the full-measuring pipeline is smaller than the second temperature threshold value, the first liquid inlet valve and the full-measuring valve are controlled to be closed.

In some embodiments, the liquid nitrogen apparatus further comprises: the emptying valve is connected with the top of the storage tank through an emptying pipeline; the liquid supply pump is connected with the storage tank through a liquid supply pipeline; the third temperature sensor is arranged at the discharge outlet of the liquid supply pump and is used for detecting the discharge temperature value of the liquid supply pump; and a controller further configured to: when the liquid nitrogen equipment supplies liquid outwards, acquiring a discharge temperature value through a third temperature sensor; when the discharge temperature value is greater than the third temperature threshold value, the opening of the emptying valve is controlled; alternatively, the vent valve is controlled to close when the discharge temperature value is less than or equal to the third temperature threshold.

In some embodiments, the liquid nitrogen apparatus further comprises: the liquid supply pump is connected with the storage tank through a liquid supply pipeline; the first pressure sensor is arranged at the discharge outlet of the liquid supply pump and is used for detecting the discharge pressure value of the liquid supply pump; and a controller further configured to: when liquid nitrogen equipment supplies liquid outwards, a first discharge pressure value at a third moment is obtained through a first pressure sensor; and controlling the liquid supply pump to increase the rotating speed when the first discharge pressure value is smaller than the first pressure threshold value.

In some embodiments, the liquid nitrogen apparatus further comprises: the pressure increasing valve is connected with the storage tank; and a controller configured to, after controlling the liquid supply pump to increase the rotation speed: acquiring a second discharge pressure value at a fourth moment through the first pressure sensor, wherein the fourth moment is positioned after the third moment, and the time interval between the fourth moment and the third moment is equal to a preset time interval; and when the second discharge pressure value is smaller than the first pressure threshold value, controlling the booster valve to be opened until the discharge pressure value detected by the first pressure sensor is equal to the first pressure threshold value.

In some embodiments, the liquid nitrogen apparatus further comprises: the second pressure sensor is arranged in the interlayer of the storage tank and is used for detecting the pressure value in the interlayer of the storage tank; and a controller further configured to: acquiring a pressure value in an interlayer of the storage tank through a second pressure sensor; and when the pressure value in the interlayer of the storage tank is smaller than the second pressure threshold value, sending out prompt information for prompting the vacuumizing operation of the liquid nitrogen equipment.

In some embodiments, the liquid nitrogen apparatus further comprises: the driving safety valve is connected with the top of the storage tank; the third pressure sensor is arranged at the top of the storage tank and is used for acquiring the pressure value in the storage tank; and a controller further configured to: in the transportation process of the liquid nitrogen equipment, the pressure value in the storage tank is obtained through a third pressure sensor; when the pressure value in the storage tank is larger than a third pressure threshold value, controlling a driving safety valve to be opened; or when the pressure value in the storage tank is smaller than or equal to the third pressure threshold value, controlling the running safety valve to be closed.

In a second aspect, an embodiment of the present application provides a method for controlling a liquid nitrogen apparatus, where the method includes: when liquid nitrogen equipment needs to be filled, a first temperature value of the interior of the storage tank at a first moment is obtained; if the first temperature value is smaller than or equal to the first temperature threshold value, controlling the first liquid inlet valve to be opened; or if the first temperature value is greater than the first temperature threshold value, controlling the second liquid inlet valve to be opened.

In some embodiments, the method further comprises: the opening of the full-measuring valve is controlled while the opening of the first liquid inlet valve is controlled; after the full-valve is opened, acquiring a temperature value of a side full pipeline; and when the temperature value of the side full pipeline is smaller than the second temperature threshold value, the first liquid inlet valve and the full measuring valve are controlled to be closed.

In some embodiments, the method further comprises: when liquid nitrogen equipment supplies liquid outwards, acquiring a discharge temperature value; when the discharge temperature value is greater than the third temperature threshold value, the opening of the emptying valve is controlled; alternatively, the vent valve is controlled to close when the discharge temperature value is less than or equal to the third temperature threshold.

In some embodiments, the method further comprises: when liquid nitrogen equipment supplies liquid outwards, a first discharge pressure value at a third moment is obtained; and controlling the liquid supply pump to increase the rotating speed when the first discharge pressure value is smaller than the first pressure threshold value.

In some embodiments, after controlling the fluid supply pump to increase the rotational speed, the method further comprises: acquiring a second discharge pressure value at a fourth moment, wherein the fourth moment is positioned after the third moment, and the time interval between the fourth moment and the third moment is equal to a preset time interval; and when the second discharge pressure value is smaller than the first pressure threshold value, controlling the pressurizing valve to be opened until the detected discharge pressure value is equal to the first pressure threshold value.

In some embodiments, the method further comprises: acquiring a pressure value in an interlayer of the storage tank; and when the pressure value in the interlayer of the storage tank is smaller than the second pressure threshold value, sending out prompt information for prompting the vacuumizing operation of the liquid nitrogen equipment.

In some embodiments, the method further comprises: in the transportation process of liquid nitrogen equipment, acquiring a pressure value in the storage tank; when the pressure value in the storage tank is larger than a third pressure threshold value, controlling a driving safety valve to be opened; or when the pressure value in the storage tank is smaller than or equal to the third pressure threshold value, controlling the running safety valve to be closed.

In a third aspect, an embodiment of the present application provides a controller, including: one or more processors; one or more memories; wherein the one or more memories are configured to store computer program code comprising computer instructions that, when executed by the one or more processors, cause the controller to perform the method of controlling any of the liquid nitrogen devices provided in the second aspect.

In a fourth aspect, embodiments of the present application provide a computer-readable storage medium comprising computer instructions that, when run on a computer, cause the computer to perform the method of controlling any one of the liquid nitrogen apparatuses provided in the second aspect.

In a fifth aspect, embodiments of the present application provide a computer program product directly loadable into a memory and comprising software code, when loaded and executed via a computer, for enabling the implementation of a method of controlling a liquid nitrogen device as any of the second aspects is provided.

It should be noted that the above-mentioned computer instructions may be stored in whole or in part on a computer-readable storage medium. The computer readable storage medium may be packaged together with the processor of the controller or may be packaged separately from the processor of the controller, which is not limited in the present application.

The advantageous effects described in the second to fifth aspects of the present application may be referred to for the advantageous effect analysis of the first aspect, and will not be described here again.

Drawings

The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate and do not limit the application.

FIG. 1 is a schematic diagram of a liquid nitrogen device according to an embodiment of the present application;

FIG. 2 is a block diagram of the hardware configuration of a liquid nitrogen device according to an embodiment of the present application;

FIG. 3 is a schematic flow chart of a control method of liquid nitrogen equipment according to an embodiment of the present application;

FIG. 4 is a schematic flow chart of another control method of liquid nitrogen equipment according to an embodiment of the present application;

FIG. 5 is a schematic flow chart of another control method of liquid nitrogen equipment according to an embodiment of the present application;

FIG. 6 is a schematic flow chart of another control method of liquid nitrogen equipment according to an embodiment of the present application;

FIG. 7 is a schematic flow chart of another control method of liquid nitrogen equipment according to an embodiment of the present application;

FIG. 8 is a schematic flow chart of another control method of liquid nitrogen equipment according to an embodiment of the present application;

FIG. 9 is a schematic flow chart of another control method of liquid nitrogen equipment according to an embodiment of the present application;

FIG. 10 is a schematic flow chart of another control method of liquid nitrogen equipment according to an embodiment of the present application;

fig. 11 is a schematic hardware structure of a controller according to an embodiment of the present application.

Reference numerals: a liquid nitrogen device 100; a storage tank 101; a first inlet valve 102; a second liquid inlet valve 103; a pressure increasing valve 104; a vaporizer 105; a liquid supply valve 106; a liquid supply pump 107; a first shut-off valve 108; a second shutoff valve 109; a balancing valve 110; a check valve 111; a blow-off valve 112; a traffic safety valve 113; a first relief valve 114; a second relief valve 115; a fill valve 116; a controller 117; differential pressure gauge 118; a mechanical pressure gauge 119; a first temperature sensor 120; a second temperature sensor 121; a third temperature sensor 122; a first pressure sensor 123; a second pressure sensor 124; a third pressure sensor 125; a fourth pressure sensor 126.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. 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.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected. 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, when describing a pipeline, the terms "connected" and "connected" as used herein have the meaning of conducting. The specific meaning is to be understood in conjunction with the context.

In embodiments of the application, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g." in an embodiment should not be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

The valves of a liquid nitrogen tank and an accessory pipeline of the existing liquid nitrogen device are basically controlled by manual operation of operators, and the valves comprise liquid filling, liquid discharging, liquid level control, pressurization, a safety system and the like of the liquid nitrogen tank, all of which need to pay attention to parameters of the liquid nitrogen device at all times, and each valve is adjusted and operated according to the change of the parameters in the actual working process of the liquid nitrogen device, so that the operation difficulty is high, meanwhile, the safety problem is also caused, and the normal use of the liquid nitrogen device and the safety of the operators are influenced. Therefore, it is necessary to realize automatic control of the liquid nitrogen equipment so as to reduce the operation difficulty of the liquid nitrogen equipment and improve the experience of operators.

Therefore, the embodiment of the application provides a control method of liquid nitrogen equipment, which is used for controlling different valves to be opened or closed under different conditions by acquiring real-time parameters (such as a temperature value and a pressure value) of the liquid nitrogen equipment in the working process and according to the magnitude relation between the real-time parameters and a preset parameter threshold value, so that manual operation control by operators is not needed, automatic control of the liquid nitrogen equipment is realized, the operation difficulty is reduced, and the experience of the operators is improved.

For further description of the scheme of the present application, fig. 1 is a schematic structural diagram of a liquid nitrogen device according to an embodiment of the present application.

As shown in fig. 1, the liquid nitrogen apparatus 100 includes a storage tank 101, liquid inlet valves (e.g., a first liquid inlet valve 102 and a second liquid inlet valve 103 shown in fig. 1), a booster valve 104, a vaporizer 105, a liquid supply valve 106, a liquid supply pump 107, stop valves (e.g., a first stop valve 108 and a second stop valve 109), a balance valve 110, a check valve 111, a purge valve 112, safety valves (e.g., a drive safety valve 113, a first safety valve 114 and a second safety valve 115), a filling valve 116, a controller 117 (not shown in fig. 1), a differential pressure gauge 118, a mechanical pressure gauge 119, a first temperature sensor 120, a second temperature sensor 121, a third temperature sensor 122, a first pressure sensor 123, a second pressure sensor 124, a third pressure sensor 125, and a fourth pressure sensor 126.

Wherein the tank may also be referred to as a liquid nitrogen tank, the tank 101 is used for storing liquid nitrogen. The tank 101 may be oval as shown in fig. 1, or other shape, without limitation. The storage tank 101 is generally divided into a liquid nitrogen storage tank and a liquid nitrogen transportation tank, wherein the liquid nitrogen storage tank is mainly used for standing storage of indoor liquid nitrogen and is not suitable for long-distance transportation in a working state. The liquid nitrogen transportation tank is specially designed for vibration prevention in order to meet transportation conditions. It can be stored in a static state and transported in a liquid nitrogen filled state.

In some embodiments, the tank 101 includes an inner liner and an outer layer, with an interlayer formed between the outer layer and the inner liner, the interlayer having a thermal insulation effect on the inner liner.

In some embodiments, the liquid nitrogen device 100 is provided with a liquid inlet valve, and the liquid inlet valve is arranged on a liquid inlet pipeline, and is used for controlling the communication and the cutoff of the liquid inlet pipeline, and the liquid inlet pipeline is communicated with the storage tank 101. One end of the liquid inlet valve is provided with a filtering device, and the filtering device comprises a filter screen, a protective cover and a filtering metal net. The filtering device is connected with the liquid inlet valve through welding or low-temperature glue.

Wherein, the liquid inlet valve arranged at the bottom of the storage tank 101 may be referred to as a bottom liquid inlet valve, such as the first liquid inlet valve 102 shown in fig. 1, and the first liquid inlet valve 102 is connected to the bottom of the storage tank 101 through a first liquid inlet pipeline. The inlet valve provided at the top of the tank 101 may be referred to as a top inlet valve, such as the second inlet valve 103 shown in fig. 1, the second inlet valve 103 being connected to the top of the tank 101 by a second inlet line.

In some embodiments, the temperature inside the tank 101 is higher when the liquid nitrogen apparatus 100 is used for the first time or is placed for a longer period of time before use. Therefore, when filling the interior of the storage tank 101, liquid can be fed from the second liquid feeding valve 103, and low-temperature liquid nitrogen enters from the top of the storage tank 101 and flows down in a bath shape, so that uniform precooling treatment can be performed on the storage tank 101.

In some embodiments, when the liquid nitrogen device 100 is in use all the time, the temperature inside the storage tank 101 is lower, and the liquid nitrogen can be filled into the storage tank 101 by adopting the first liquid inlet valve 102, so that fluctuation in flowing of the liquid nitrogen can be reduced, and the gasification amount of the liquid nitrogen can be reduced.

In some embodiments, the liquid nitrogen device 100 is provided with a pressure increasing valve 104, the pressure increasing valve 104 may be disposed at the bottom of the storage tank 101, one end of the pressure increasing valve 104 is connected with the storage tank 101 through an injection pipe, and the other end is connected with a vaporizer 105. The pressure increasing valve 104 is used to increase the pressure inside the tank 101 when the pressure inside the tank 101 is lower than a set value.

In some embodiments, when the pressure inside the tank 101 is low, the pressurization valve 104 is opened to allow liquid nitrogen inside the tank 101 to flow out of the bottom of the tank 101 into the vaporizer 105, where the liquid nitrogen is vaporized into a gas with the external environment, and then returned from the top of the tank 101 to the inside of the tank 101 to increase the pressure inside the tank 101.

In some embodiments, vaporizer 105 is used to convert a liquid gas to a gaseous gas. The vaporizer 105 can be classified into a direct heating mode and an indirect heating mode according to a heating mode, wherein the direct heating mode includes a submerged combustion vaporizer and a solid heat-conducting vaporizer. The indirect heating mode comprises an air temperature type vaporizer, a forced ventilation type vaporizer, a circulating hot water bath type vaporizer, a steam heating water bath type vaporizer and an electric heating water bath type vaporizer.

In some embodiments, vaporizer 105 is used to heat the liquid nitrogen released by pressurization valve 104 to increase the pressure inside storage tank 101.

In some embodiments, a liquid supply valve 106 is disposed at the bottom of the storage tank 101, and the liquid supply valve 106 is disposed on a liquid supply pipeline for controlling the connection and disconnection of the liquid supply pipeline, and the liquid supply pipeline is connected to the storage tank 101. The liquid supply valve 106 is used to open the liquid supply valve 106 when the liquid nitrogen device 101 supplies liquid nitrogen to an external device, and the liquid nitrogen flows out of the liquid supply valve 106 to the liquid supply pump 107. One end of the liquid supply valve 106 is connected to a liquid supply pump 107 via a pipe.

In some embodiments, liquid feed pump 107 is used to supply liquid nitrogen to an external device, and liquid feed pump 107 is connected to tank 101 via a liquid feed line.

In some embodiments, the liquid nitrogen apparatus 100 is provided with shut-off valves, such as a first shut-off valve 108 and a second shut-off valve 109. The shut-off valve may also be referred to as a shut-off valve, which relies on the valve lever pressure to cause the sealing surface of the valve flap to closely conform to the sealing surface of the valve seat, preventing the flow of media.

As shown in fig. 1, the piping at the top of the tank 101 is connected to a differential pressure gauge 118 and a balancing valve 110 through a first shut-off valve 108. The piping at the bottom of the tank 101 may also be connected to a differential pressure gauge 118 and a balancing valve 110 via a second shut-off valve 109.

When the first shut-off valve 108 is opened, liquid nitrogen may enter the differential pressure gauge 118 from the bottom of the tank 101, creating a pressure on the differential pressure gauge 118. When the second shut-off valve 109 is opened, liquid nitrogen may enter the differential pressure gauge 118 from the top of the tank 101, creating a pressure on the differential pressure gauge 118.

In some embodiments, the balancing valve 110 is connected at one end to the first pressure sensor 119 via a line and at one end to the shut-off valve 109 via a line.

In some embodiments, the balancing valve 110 is used to communicate media on both sides of the differential pressure gauge 118, and may balance the pressure on both sides of the differential pressure gauge 118, zeroing the differential pressure gauge 118.

In some embodiments, one end of the check valve 111 is connected to the top of the tank 101 by a line and one end is connected to the vaporizer 105 by a line. The one-way valve 111 is also called a check valve or a non-return valve. For preventing reverse flow of oil flow in hydraulic systems or compressed air in pneumatic systems. The one-way valve has two types, namely a straight-through type valve and a right-angle type valve. The straight-through one-way valve is installed on the pipeline in a threaded connection mode. The right-angle one-way valve has three forms of threaded connection, plate connection and flange connection.

In some embodiments, one-way valve 111 is used to prevent backflow of medium (e.g., liquid nitrogen) in the piping of vaporizer 105 during heating and pressurizing the interior of storage tank 101.

In some embodiments, a vent valve 112 is connected to the top of the tank 101 via a vent line for controlling the vent valve 112 to open to relieve pressure inside the tank 101 when pressure inside the tank 101 is too high.

In some embodiments, the relief valves are connected to the top of the storage tank 101 by piping, such as a service valve 113, a first relief valve 114, and a second relief valve 115. The safety valve is a special valve which is in a normally closed state under the action of external force and prevents the medium pressure in the pipeline or the equipment from exceeding a specified value by discharging the medium to the outside of the system when the medium pressure in the equipment or the pipeline rises to exceed the specified value. It should be noted that the number of safety valves shown in fig. 1 is merely exemplary, and the number of safety valves is not limited in the embodiment of the present application.

In some embodiments, the running safety valve 113 is used for increasing the vaporization amount of liquid nitrogen when the liquid nitrogen device 100 is in a transportation state, resulting in the increase of the pressure in the storage tank 101, and when the pressure value in the storage tank 101 exceeds a set value, the running safety valve 113 is controlled to be opened, and the nitrogen at the top of the storage tank 101 can be vented through the safety valve 113, so that the overpressure in the storage tank 101 caused by the vaporization of the liquid nitrogen in the storage tank 101 due to the fluctuation of the liquid nitrogen in the storage tank 101 is prevented when the liquid nitrogen device 100 is in the transportation state.

In some embodiments, the first relief valve 114 is configured to unseat when the pressure inside the tank 101 reaches a relief valve set point to quickly release the pressure inside the tank 101, avoiding safety risks caused by an overpressure inside the tank 101.

In some embodiments, the second relief valve 115 is used to slowly release the pressure inside the tank 101 when the trip relief valve 113 is in an open state, avoiding overpressure of the tank 101 caused by fluctuation of liquid nitrogen inside the tank 101.

In some embodiments, a fill valve 116 is disposed on a pipeline at the top of the tank 101, and is configured to detect whether the liquid in the tank 101 is completely filled during the liquid filling process of the tank 101, for example, when the fill valve 116 is in an open state and the tank 101 is in a liquid filling state, if the fill valve 116 continuously discharges liquid nitrogen, it indicates that the liquid filling in the tank 101 is complete.

In some embodiments, the line communicating between the fill valve 101 and the tank 101 may be referred to as a side full line.

In some embodiments, the controller 117 refers to a device that may generate an operation control signal instructing the laundry treating apparatus 100 to execute a control instruction according to the instruction operation code and the timing signal. By way of example, the controller 117 may be a central processing unit (central processing unit, CPU), a general purpose processor network processor (network processor, NP), a digital signal processor (digital signal processing, DSP), a microprocessor, a microcontroller, a programmable logic device (programmable logic device, PLD), or any combination thereof. The controller 117 may also be other devices with processing functions, such as a circuit, a device, or a software module, which is not limited in any way by the embodiments of the present application.

Further, the controller 117 may be used to control the operation of the various components within the liquid nitrogen apparatus 100 such that the various components of the liquid nitrogen apparatus 100 operate to perform the various predetermined functions of the liquid nitrogen apparatus.

In some embodiments, the controller 117 may control each valve body inside the liquid nitrogen apparatus 100 in an electric, pneumatic or hydraulic manner, and the control manner in which the controller 117 controls each valve body inside the liquid nitrogen apparatus 100 is not limited in the embodiments of the present application.

In some embodiments, the top end of the differential pressure type liquid level gauge 118 is connected to the stop valve 108 through a pipeline, the bottom end of the differential pressure type liquid level gauge 118 is connected to the stop valve 109 through a pipeline, and is used for detecting pressure values of the top and the bottom of the storage tank 101, converting the detected pressure values of the top and the bottom of the storage tank 101 into liquid level indications inside the storage tank 101, and an operator can determine the liquid level of liquid nitrogen in the storage tank 101 by combining the liquid level indications displayed by the differential pressure type liquid level gauge 118 and a liquid level comparison table.

In some embodiments, a mechanical pressure gauge 119 may be disposed between the shut-off valve 109 and the balancing valve 110 for detecting a pressure value inside the tank 101. The operator can learn the pressure value inside the tank 101 by looking at the mechanical pressure gauge 119.

In some embodiments, the first temperature sensor 120 is connected to the controller 117, and the first temperature sensor 120 may be disposed inside the tank 101, for example, on the top of the tank 101, in the middle of the tank 101, or on the bottom of the tank 101.

The first temperature sensor 120 is used to detect a temperature value inside the tank 101.

In some embodiments, a second temperature sensor 121 is connected to the controller 117, and the second temperature sensor 121 may be disposed in the side full line for detecting a temperature value of the side full line.

In some embodiments, a third temperature sensor 122 is coupled to the controller 117, and the third temperature sensor 122 may be disposed adjacent to the discharge port of the fluid supply pump 107 and may be used to detect a discharge temperature value at the discharge port of the fluid supply pump 107.

In some embodiments, first pressure sensor 123 is coupled to controller 117 and first pressure sensor 123 may be disposed adjacent to the discharge port of fluid supply pump 107. For detecting the discharge pressure value of the liquid feed pump 107.

In some embodiments, a second pressure sensor 124 is coupled to the controller 117, and the second pressure sensor may be disposed within the sandwich of the tank 101 for detecting a pressure value within the sandwich of the tank 101.

In some embodiments, a third pressure sensor 125 is coupled to the controller 117, and the third pressure sensor 125 may be disposed inside the tank 101, for example, at the top of the tank 101, to detect a pressure value at the top of the tank 101, and send the detected pressure value at the top of the tank 101 to the controller 117.

In some embodiments, a fourth pressure sensor 126 is coupled to the controller 117, and the fourth pressure sensor 126 may be disposed inside the tank 101, for example, at the bottom of the tank 101, to detect a pressure value at the bottom of the tank 101, and send the detected pressure value at the bottom of the tank 101 to the controller 117.

In some embodiments, the controller 117 may obtain a pressure value difference according to the pressure value of the top of the storage tank 101 sent by the third pressure sensor 125 and the pressure value of the bottom of the storage tank 101 sent by the fourth pressure sensor 126, and further perform liquid level conversion on the pressure value difference, so as to obtain a liquid level value of liquid nitrogen inside the storage tank 101.

Fig. 2 is a block diagram schematically showing the hardware configuration of the liquid nitrogen apparatus 100 in the embodiment of the present application.

As shown in fig. 2, the liquid nitrogen apparatus 100 may further include one or more of the following: a voice prompt 127 and a communication interface 128.

In some embodiments, a voice prompt 127 is coupled to the controller 117 for sounding a prompt after the liquid nitrogen apparatus 100 is filled or discharged to prompt the user that the relevant process is complete.

In some embodiments, a communication interface 128 is coupled to the controller 117, the communication interface 128 being a component for communicating with external devices or servers according to various communication protocol types. For example: the communication interface 128 may include at least one of a wireless communication technology (WIFI) module, a bluetooth module, a wired ethernet module, a near field wireless communication technology (near field communication, NFC) module, or other network communication protocol chip or near field communication protocol chip, and an infrared receiver. The communication interface 128 may be used to communicate with other devices or communication networks (e.g., ethernet, radio access network (radio access network, RAN), wireless local area network (wireless local area networks, WLAN), etc.). Illustratively, the communication interface 128 is coupled to the controller 117, and the controller 117 may communicate with the terminal device via the communication interface 128.

In some embodiments, when controller 117 detects that the pressure value within the interlayer of liquid nitrogen device 100 exceeds a predetermined range, controller 117 may send a prompt message to the terminal device via communication interface 128 to prompt a vacuum pump operation to liquid nitrogen device 100.

Although not shown in fig. 2, the liquid nitrogen apparatus 100 may further include a power supply device (such as a battery and a power management chip) for supplying power to the respective components, and the battery may be logically connected to the controller 117 through the power management chip, thereby performing functions of power consumption management and the like of the liquid nitrogen apparatus 100 through the power supply device.

It will be appreciated that the structure illustrated in the embodiments of the present application does not constitute a specific limitation on the liquid nitrogen apparatus. In other embodiments of the application, the liquid nitrogen apparatus may include more or less components than illustrated, or certain components may be combined, or certain components may be split, or different arrangements of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

Embodiments of the present application will be described in detail below with reference to the accompanying drawings.

The embodiment of the application provides a control method of liquid nitrogen equipment, which is applied to the controller 117 in the liquid nitrogen equipment 100. As shown in fig. 3, the control method may include the steps of:

s101, when liquid nitrogen equipment needs to be filled, acquiring a first temperature value of the interior of the storage tank at a first moment.

The third pressure sensor is arranged at the top of the storage tank, so that the pressure value at the top of the storage tank can be obtained in real time; the bottom of the storage tank is provided with a fourth pressure sensor, so that the pressure value at the bottom of the storage tank can be obtained in real time.

In some embodiments, the level value of the interior of the tank at each time instant may be obtained by level scaling the pressure value difference between the pressure value at the top of the tank and the pressure value at the bottom of the tank at each time instant. It will be appreciated that the level value inside the tank, i.e. the level of liquid nitrogen inside the tank.

In some embodiments, the level value inside the tank can be obtained by the following formula (1):

wherein H is the liquid level value in the storage tank, ρ is the density of liquid nitrogen in the storage tank, and P ₁ Is the pressure value of the top of the storage tank, P ₂ Is the pressure value at the bottom of the tank.

The controller obtains the liquid level value of the storage tank at each moment, and if the liquid level value of the storage tank at a certain moment is detected to be larger than or equal to the first liquid level threshold value, the liquid nitrogen content of the storage tank at the moment is higher, and liquid nitrogen is not required to be supplemented.

In some embodiments, if the liquid level value of the interior of the storage tank at a certain moment is detected to be smaller than or equal to the second liquid level threshold value, the liquid nitrogen content of the interior of the storage tank at the moment is lower, and the liquid nitrogen needs to be supplemented, namely the liquid nitrogen equipment is determined to need to be filled. The first liquid level threshold value and the second liquid level threshold value are preset by an operator of the liquid nitrogen equipment, the first liquid level threshold value is larger than or equal to the second liquid level threshold value, the first liquid level threshold value can be called as a high liquid level limit value, and the second liquid level threshold value can be called as a low liquid level limit value.

Because the bottom of the storage tank is provided with the first liquid inlet valve, and the top of the storage tank is provided with the second liquid inlet valve, after the liquid nitrogen equipment is determined to be filled, a first temperature value of the inside of the storage tank at a first moment needs to be obtained, and then whether the first liquid inlet valve is opened or the second liquid inlet valve is opened is determined to be filled into the storage tank according to the first temperature value. The first time may be a time when the controller detects that the liquid level value inside the storage tank is less than or equal to a first liquid level value threshold, and the first liquid level value threshold may be preset by an operator of the liquid nitrogen device.

S102, if the first temperature value is smaller than or equal to the first temperature threshold value, controlling the first liquid inlet valve to be opened.

It will be appreciated that the temperature value inside the tank needs to be in line with the temperature value of the liquid nitrogen to be entered inside the tank in order to function to maintain the temperature of the liquid nitrogen.

If the first temperature value is less than or equal to the first temperature threshold, it means that the temperature value inside the storage tank is lower at the first moment, and the effect of maintaining the temperature of the liquid nitrogen entering the storage tank can be achieved. Therefore, the first liquid inlet valve at the bottom of the storage tank can be controlled to be opened, so that liquid nitrogen enters the storage tank from the bottom of the storage tank. Wherein the first temperature threshold value can be preset by an operator of the liquid nitrogen equipment

It can be understood that liquid nitrogen enters the storage tank from the bottom of the storage tank, so that fluctuation generated when the liquid nitrogen flows can be reduced, and the gasification amount of the liquid nitrogen is reduced.

And S103, if the first temperature value is greater than the first temperature threshold value, controlling the second liquid inlet valve to be opened.

If the first temperature value is greater than the first temperature threshold, the temperature value inside the storage tank is higher at the first moment, and the effect of maintaining the temperature of the entering liquid nitrogen cannot be achieved. So that the second liquid inlet valve positioned at the top of the storage tank can be controlled to be opened, so that liquid nitrogen enters the storage tank from the top of the storage tank.

It can be understood that after the second liquid inlet valve at the top of the storage tank is opened, liquid nitrogen can be filled into the storage tank from the top of the storage tank in a shower, and the temperature value of the liquid nitrogen is lower, so that the uniform precooling effect on the inside of the storage tank can be achieved, and the temperature value of the inside of the storage tank can be reduced.

Based on the embodiment shown in fig. 3, the controller obtains a first temperature value inside the tank at a first time when the liquid nitrogen device needs to be filled. If the first temperature value is smaller than or equal to the first temperature threshold value, the temperature value inside the storage tank is proper at the first moment, and in order to reduce the gasification amount of the liquid nitrogen entering the storage tank, a first liquid inlet valve positioned at the bottom of the storage tank can be controlled to be opened, so that the liquid nitrogen enters the storage tank from the bottom of the storage tank. If the first temperature value is greater than the first temperature threshold value, the temperature value inside the storage tank is higher at the first moment, and the liquid nitrogen entering the storage tank cannot be well kept at the temperature, so that the second liquid inlet valve at the top of the storage tank can be controlled to be opened, the liquid nitrogen enters the storage tank from the top of the storage tank, and the cooling effect of the storage tank is achieved. Therefore, the control method of the liquid nitrogen equipment provided by the embodiment of the application can realize automatic liquid charging of the liquid nitrogen equipment, realize automatic control of the liquid nitrogen equipment, reduce the operation difficulty of the liquid nitrogen equipment and promote the experience of operators. In addition, in the control method of the liquid nitrogen equipment, in the automatic liquid filling process of the liquid nitrogen equipment, the influence of the temperature value in the storage tank on the temperature of liquid nitrogen to be fed into the storage tank is combined, and the controller is adopted to control different liquid inlet valves to be opened under different conditions according to the temperature value in the storage tank, so that the rationality of the liquid inlet mode of the liquid nitrogen equipment is improved.

In some embodiments, as shown in fig. 4, after controlling the second inlet valve to open, i.e. after step S103, the method may further include the steps of:

s201, acquiring a second temperature value of the interior of the storage tank at a second moment.

Wherein the second time is any time after the first time.

As can be seen from S103, after the second liquid inlet valve is controlled to be opened, liquid nitrogen can enter the storage tank from the top of the storage tank in a shower shape, so that the temperature value in the storage tank can be reduced, and the uniform precooling effect is achieved in the storage tank. But liquid nitrogen enters the storage tank from the top of the storage tank, fluctuation in flowing of the liquid nitrogen can be increased, gasification amount of the liquid nitrogen is increased, pressure value in the storage tank can be increased, the pressure value in the storage tank is easily caused to be too high, and safety risk is caused.

Therefore, after a period of time when the second liquid inlet valve is opened, the second liquid inlet valve needs to be closed in time, so that liquid nitrogen is prevented from entering the storage tank from the top of the storage tank, and the gasification amount of the liquid nitrogen is reduced as much as possible.

S202, if the second temperature value is smaller than or equal to the first temperature threshold value, the second liquid inlet valve is controlled to be closed, and the first liquid inlet valve is controlled to be opened.

It will be appreciated that if the second temperature value is less than or equal to the first temperature threshold value, it means that at the second time, the temperature value inside the tank has decreased to the appropriate temperature. In order to reduce the gasification of liquid nitrogen, the second liquid inlet valve can be controlled to be closed, and then the first liquid inlet valve is controlled to be opened, so that liquid nitrogen enters the storage tank from the bottom of the storage tank more gradually, fluctuation of liquid nitrogen in flowing can be reduced, and the gasification of liquid nitrogen is reduced.

In some embodiments, if the second temperature value is greater than the first temperature threshold, which means that the temperature value inside the storage tank has not been reduced to the proper temperature at the second time, the second liquid inlet valve may be kept controlled to be opened to allow liquid nitrogen to enter the storage tank from the top of the storage tank in order to reduce the temperature value inside the storage tank during the process of filling the storage tank.

In some embodiments, in combination with the method shown in fig. 3 or fig. 4, as shown in fig. 5, when the first intake valve is controlled to be opened, the method further includes the following steps:

s301, controlling the opening of the full-metering valve while controlling the opening of the first liquid inlet valve.

The controller controls the first liquid inlet valve to be opened, the temperature inside the storage tank is suitable, and liquid nitrogen can continuously enter the storage tank from the bottom of the storage tank. However, in order to timely detect that the liquid nitrogen content entering the storage tank reaches the liquid nitrogen content limit value which can be stored in the storage tank, the opening of the full-measuring valve can be controlled while the opening of the first liquid inlet valve is controlled.

After the full-measuring valve is opened, when the full-measuring valve continuously flows out of liquid nitrogen, the liquid nitrogen content in the storage tank reaches the limit value of the liquid nitrogen content which can be stored in the storage tank. Therefore, the opening of the full-measuring valve can be controlled to detect whether the liquid nitrogen content entering the storage tank reaches the liquid nitrogen content limit value inside the storage tank in real time.

S302, after the full-metering valve is opened, acquiring a temperature value of a side full pipeline.

From the above, the line between the fill valve and the tank for communication may be referred to as a side full line. The controller can not know that the full-measuring valve continuously flows out of liquid nitrogen, so that a temperature sensor can be arranged in the full-side pipeline, and the controller acquires the temperature value of the full-side pipeline in real time through the temperature sensor.

And S303, when the temperature value of the side full pipeline is smaller than a second temperature threshold value, the first liquid inlet valve and the full measuring valve are controlled to be closed.

It will be appreciated that the temperature of the liquid nitrogen is lower, which results in a decrease in the temperature value in the side full line as the liquid nitrogen enters the side full line. When liquid nitrogen enters the side full pipeline, the liquid nitrogen content in the storage tank reaches the liquid nitrogen content limit value which can be stored by the liquid nitrogen, and the liquid nitrogen can be understood as the liquid nitrogen filled in the storage tank.

Therefore, when the detected temperature value of the liquid nitrogen pipeline is smaller than the second temperature threshold value, the liquid nitrogen is filled in the storage tank, and in order to avoid waste of liquid nitrogen resources caused by flowing out of the full-measuring valve, the first liquid inlet valve and the full-measuring valve can be controlled to be closed. The second temperature threshold may be preset by an operator of the liquid nitrogen device.

In some embodiments, in combination with the embodiments shown in fig. 3, 4 or 5, the controller may also obtain the level value of the interior of the tank at each moment after controlling the first or second inlet valve to open. When the liquid level value in the storage tank is detected to be greater than or equal to the second liquid level threshold value at a certain moment, the storage tank is filled with liquid nitrogen, and the first liquid inlet valve or the second liquid inlet valve can be controlled to be closed, namely, liquid supply to the storage tank is stopped.

In some embodiments, after the controller controls the first liquid inlet valve or the second liquid inlet valve to be opened, the controller may determine whether to control the first liquid inlet valve or the second liquid inlet valve to be closed according to a real-time liquid level value inside the storage tank, and may also determine whether to control the first liquid inlet valve or the second liquid inlet valve to be closed according to a temperature value of the liquid nitrogen device (including a temperature value inside the storage tank and a temperature value of a side full pipeline). The embodiment of the application is not limited in the way of judging whether to control the first liquid inlet valve or the second liquid inlet valve to be closed.

Based on the embodiment shown in fig. 5, when the liquid nitrogen equipment is in a liquid inlet state, the liquid inlet valve is controlled to be closed according to the liquid level value or the temperature value of the side full pipeline in the storage tank by acquiring the liquid level value or the temperature value in real time, and the manual judgment and the manual operation of an operator are not needed, so that the automatic control of the liquid inlet process of the liquid nitrogen equipment is realized, and the operation difficulty of the liquid nitrogen equipment is reduced.

The above embodiments focus on the steps involved in the control method performed by the controller when the liquid nitrogen apparatus is in the liquid feeding state, and in some embodiments, as shown in fig. 6, the control method may further include the steps of:

s401, acquiring a discharge temperature value when liquid is supplied to the outside of the liquid nitrogen equipment.

When the liquid nitrogen device supplies liquid nitrogen to external back-end equipment, in order to avoid unsmooth operation of the back-end equipment caused by more gas mixed in the liquid nitrogen, the discharge temperature value of the liquid nitrogen device needs to be acquired in real time. The discharge temperature value of the liquid nitrogen equipment is the temperature value of the discharge outlet of the liquid feed pump of the liquid nitrogen equipment.

And S402, controlling the opening of the emptying valve when the discharge temperature value is larger than a third temperature threshold value.

When the discharge temperature value is larger than the third temperature threshold value, the phenomenon that the gas mixed in the liquid nitrogen discharged at the moment is excessive is indicated, the operation of the back-end equipment is not facilitated, and the opening of the emptying valve can be controlled. After the vent valve is opened, the gas in the liquid nitrogen can be vented from the vent valve at the top of the tank. The third temperature threshold may be preset by an operator of the liquid nitrogen device.

And S403, controlling the vent valve to be closed when the discharge temperature value is smaller than or equal to a third temperature threshold value.

As the gas in the liquid nitrogen is discharged through the vent valve, the temperature value inside the storage tank is reduced, thereby causing the discharge temperature value of the liquid nitrogen device to be reduced. When the detected discharge temperature value is smaller than or equal to the third temperature threshold value, the gas in the liquid nitrogen is reduced to a proper range, the vent valve can be controlled to be closed, and the liquid supply pump normally supplies the liquid nitrogen to the back-end equipment.

Based on the embodiment shown in fig. 6, when liquid nitrogen equipment supplies liquid outwards, the discharge temperature value of the liquid supply pump is obtained in real time, when the discharge temperature value is higher, the opening of the emptying valve is controlled in time, the phenomenon that the back-end equipment is not smooth due to the fact that more gas is mixed in liquid nitrogen is avoided, and automatic control of the discharge temperature value of the liquid supply pump when the liquid nitrogen equipment is in a liquid supply state is realized.

In some embodiments, as shown in fig. 7, the control method may further include the steps of, when the liquid nitrogen apparatus is in a liquid supply state:

s501, when liquid is supplied to the outside of the liquid nitrogen equipment, a first discharge pressure value at a third moment is obtained.

In order to ensure that the liquid nitrogen device has sufficient pressure when supplying liquid nitrogen to external back-end equipment, the discharge pressure value of the liquid supply pump of the liquid nitrogen device needs to be detected in real time, so that the first discharge pressure value of the liquid supply pump at a third moment can be obtained, and the third moment can be any moment after the liquid supply pump starts to work.

And S502, controlling the liquid supply pump to increase the rotating speed when the first discharge pressure value is smaller than the first pressure threshold value.

If the first discharge pressure value is smaller than the first pressure threshold, which means that the internal pressure of the storage tank is insufficient at the third moment, the liquid supply pump can be controlled to increase the rotating speed, so that the discharge pressure value of the liquid supply pump meets the first pressure threshold. The first pressure threshold may be preset by an operator of the liquid nitrogen device.

S503, acquiring a second discharge pressure value at a fourth moment.

After the rotation speed of the liquid supply pump is controlled to be increased, in order to detect whether the discharge pressure value of the liquid supply pump meets the first pressure threshold value or not, so that the liquid supply pump is controlled to be decreased in time, the waste of electric power resources is reduced, and the second discharge pressure value of the liquid supply pump at the fourth moment can be obtained. The fourth time is located after the third time, and a time interval between the fourth time and the third time is equal to a preset time interval, wherein the preset time interval can be preset by an operator of the liquid nitrogen device.

And S504, controlling the pressure increasing valve to be opened when the second discharge pressure value is smaller than the first pressure threshold value.

If the second discharge pressure value is smaller than the first pressure threshold, it means that the discharge pressure value of the fluid supply pump still does not reach the first pressure threshold even after the fluid supply pump is controlled to increase the rotation speed for a preset time interval, that is, the discharge value requirement is not satisfied. In order to make the discharge pressure value of the liquid supply pump equal to the first pressure threshold value, the pressure increasing valve may be controlled to be opened to increase the pressure value inside the storage tank until the detected discharge pressure value of the liquid supply pump is equal to the first pressure threshold value, and the pressure increasing valve is controlled to be closed.

It can be appreciated that after the pressure increasing valve is opened, liquid nitrogen can enter the vaporizer from the pipeline at the bottom of the storage tank, the vaporizer converts the liquid nitrogen into nitrogen after heat exchange, and the nitrogen enters the storage tank through the pipeline at the top of the storage tank, so that the pressure in the storage tank is increased.

In some embodiments, if the second discharge pressure value is greater than or equal to the first pressure threshold, which means that at the fourth time, the discharge pressure value of the fluid supply pump has reached the first pressure threshold, that is, meets the discharge value requirement, the fluid supply pump may be controlled to reduce the rotational speed to a normal level.

In some embodiments, after controlling the fluid supply pump to reduce the rotational speed to a normal level, if the discharge pressure value of the fluid supply pump is again less than the first pressure threshold value for some reason (e.g., use of liquid nitrogen in the tank), the controller controls the fluid supply pump to increase the rotational speed again so that the discharge pressure value of the fluid supply pump satisfies the first pressure threshold value. And detecting the discharge pressure value of the liquid supply pump again after the liquid supply pump works for a period of time at the speed of increasing the rotation speed, and controlling the pressure increasing valve to be opened if the discharge pressure value of the liquid supply pump is detected to be smaller than the first pressure threshold again, so that the discharge pressure value of the liquid supply pump meets the first pressure threshold.

Based on the embodiment shown in fig. 7, by acquiring the discharge pressure value of the liquid supply pump in real time, the liquid supply pump is controlled to increase the rotation speed when the discharge pressure value is too low. After the liquid supply pump is controlled to increase the rotating speed for a period of time, if the discharge pressure value of the liquid supply pump still cannot reach the limit of the discharge pressure value, the pressurizing valve is controlled to be opened so as to increase the pressure value in the storage tank, and the automatic control of the discharge pressure value of the liquid supply pump when the liquid nitrogen equipment is in a liquid supply state is realized.

In some embodiments, the control method may further include the following steps during use of the liquid nitrogen apparatus as shown in fig. 8:

s601, acquiring a pressure value in an interlayer of the storage tank.

In the use process of the liquid nitrogen equipment, the vacuum degree in the interlayer of the storage tank can be gradually reduced, namely the pressure value in the interlayer can be gradually reduced, and further the heat preservation effect of the interlayer on the liner of the storage tank is reduced. The interlayer has a certain heat preservation effect on the liner, namely, the pressure value in the interlayer needs to be kept in a certain range, so that the pressure value in the interlayer needs to be obtained in real time, and the interlayer is prevented from being incapable of having a good heat preservation effect on the liner due to the fact that the pressure value in the interlayer is too low.

S602, when the pressure value in the interlayer of the storage tank is smaller than a second pressure threshold value, sending out prompt information for prompting the vacuumizing operation of the liquid nitrogen equipment.

In some embodiments, if the detected pressure value in the interlayer is smaller than the second pressure threshold, the pressure value representing the interlayer cannot have a good heat preservation effect on the liner, and the liquid nitrogen in the storage tank is easily gasified and accelerated. So can send prompt message, the suggestion carries out the evacuation operation to liquid nitrogen equipment to increase the intermediate layer vacuum, increase the heat preservation effect of intermediate layer is promoted to the pressure value of intermediate layer, and then reduces the gasification speed of liquid nitrogen in the storage tank. The second pressure threshold may be preset by an operator of the liquid nitrogen device.

In some embodiments, the controller may send out the prompt information in one or more of the following implementations:

mode 1, the controller plays the prompt message through the voice prompt device.

For example, the content played by the voice prompt device may be "the pressure value in the interlayer is low, suggesting the evacuation operation of the interlayer-! ". The sound played by the voice prompt device can be preset by a manufacturer of liquid nitrogen equipment.

Optionally, after the controller receives the confirmation operation of the user, the voice prompt device may be controlled to stop playing the prompt information.

And 2, the controller sends prompt information to the terminal equipment through the communication interface.

In some embodiments, the controller may also send a prompt message to a terminal device (such as a mobile phone) of the operator through the communication interface, so as to prompt the operator to perform the vacuumizing operation on the interlayer.

And 3, the controller displays prompt information through a display.

In some embodiments, the liquid nitrogen device includes a display that may be used to display a control panel of the liquid nitrogen device, and may also be used to display a current state of the liquid nitrogen device, such as in a liquid inlet state or in a liquid supply state.

The controller can control the display to display prompt information so as to prompt an operator to carry out vacuumizing operation on the interlayer.

For example, the content of the prompt information displayed by the controller and the display can be that the pressure value in the interlayer is low, the vacuumizing operation of the interlayer is recommended-! ". The controller may control the display to maintain the display of the prompt message until no confirmation operation by the operator is received.

Based on the embodiment shown in fig. 8, through the real-time pressure value in the intermediate layer of acquisition storage tank, when detecting the pressure value in the intermediate layer of storage tank and being too low, send prompt message, avoid the pressure value in the intermediate layer to be too low and reduce the heat preservation effect to the inner bag, need not operating personnel manual detection, realized the automated control of intermediate layer pressure value.

In some embodiments, as shown in fig. 9, the control method may further include the steps of, when the liquid nitrogen apparatus is in a transportation state:

s701, acquiring a pressure value in the storage tank in the transportation process of the liquid nitrogen equipment.

Because the liquid nitrogen equipment can produce the fluctuation in the transportation of liquid nitrogen in the storage tank, and then increased liquid nitrogen gasification volume, lead to the inside pressure value of storage tank to rise, and the transportation of liquid nitrogen equipment increases danger.

Therefore, in the transportation process of the liquid nitrogen equipment, the pressure value of the top of the storage tank can be obtained in real time through the third pressure sensor arranged at the top of the storage tank.

And S702, controlling the driving safety valve to be opened when the pressure value in the storage tank is larger than a third pressure threshold value.

In some embodiments, when the pressure value inside the storage tank is detected to be greater than the third pressure threshold value, the gasification amount of the liquid nitrogen inside the current storage tank is represented to be higher, so that the pressure value inside the current storage tank is higher, and in order to ensure the transportation safety of the liquid nitrogen equipment, the running safety valve can be controlled to be opened. The third pressure threshold may be preset by an operator of the liquid nitrogen plant, and may be, for example, 0.9 mpa.

After the driving safety valve is opened, gasified nitrogen at the top of the storage tank can be discharged through the valve, so that the pressure value in the storage tank is reduced.

And S703, controlling the running safety valve to be closed when the pressure value in the storage tank is smaller than or equal to a third pressure threshold value.

When the pressure value in the storage tank is smaller than or equal to the third pressure threshold value, the gasification amount of the liquid nitrogen in the storage tank is at a normal level, and the pressure value in the storage tank is at the normal level, so that the running safety valve can be controlled to be closed.

Based on the embodiment shown in fig. 9, when the liquid nitrogen equipment is in a transportation state, the pressure value inside the storage tank is acquired in real time, and when the pressure value inside the storage tank is too high, the driving safety valve is controlled to be opened, so that the driving danger caused by the increase of the pressure value inside the storage tank due to the increase of the gasification amount of the liquid nitrogen is avoided, and the automatic control of the pressure value inside the storage tank during the transportation process of the liquid nitrogen equipment is realized.

In some embodiments, as shown in fig. 10, the control method may further include the following steps when the liquid nitrogen apparatus is in an operating state:

s801, when the liquid nitrogen equipment is in a working state, acquiring a pressure value of the top of the storage tank.

During the operation of the liquid nitrogen equipment, as the liquid nitrogen content in the storage tank is reduced, the liquid level value of the liquid nitrogen in the storage tank is gradually reduced, so that the pressure value in the storage tank is continuously reduced. And the pressure value inside the storage tank needs to be kept in a certain range, so as to avoid the pressure value inside the storage tank from being too low, the controller can acquire the top pressure value of the top of the storage tank at all times through a third pressure sensor arranged at the top of the storage tank.

S802, controlling the pressure increasing valve to be opened when the pressure value at the top of the storage tank is smaller than a fourth pressure threshold value.

When the pressure value at the top of the storage tank is smaller than the fourth pressure threshold value, the pressure value representing the inside of the current storage tank is lower, the pressure increasing valve can be controlled to be opened, so that liquid nitrogen enters the vaporizer through a pipeline at the bottom of the storage tank, the liquid nitrogen becomes nitrogen after heat exchange of the vaporizer, and the nitrogen enters the storage tank through the pipeline at the top of the storage tank, so that the pressure value inside the storage tank is increased. The fourth pressure threshold may be preset by an operator of the liquid nitrogen plant, and may be, for example, 0.1 mpa.

And S803, when the pressure value at the top of the storage tank is greater than or equal to a fifth pressure threshold value, controlling the pressurizing valve to be closed.

When the pressure value at the top of the storage tank is greater than or equal to the fifth pressure threshold value, the pressure value in the storage tank is at a normal level, and in order to avoid the danger caused by the excessively high pressure value in the storage tank, the pressurizing valve is controlled to be closed in time, so that the pressurizing of the interior of the storage tank is stopped. Wherein the fifth pressure threshold may be preset by an operator of the liquid nitrogen apparatus, and the fifth pressure threshold is greater than the fourth pressure threshold, for example, may be 0.5 mpa.

Based on the embodiment shown in fig. 10, when the liquid nitrogen equipment is in a working state, the pressure value inside the storage tank is obtained in real time, and when the pressure value inside the storage tank is too low, the pressure increasing valve is controlled to be opened, so that the pressure value inside the storage tank is prevented from being too low, and the automatic control of the pressure value inside the storage tank when the liquid nitrogen equipment is in the working state is realized.

It can be seen that the foregoing description of the solution provided by the embodiments of the present application has been presented mainly from a method perspective. To achieve the above-mentioned functions, embodiments of the present application provide corresponding hardware structures and/or software modules that perform the respective functions. Those of skill in the art will readily appreciate that the various illustrative modules and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

The embodiment of the application can divide the functional modules of the controller according to the method example, for example, each functional module can be divided corresponding to each function, and two or more functions can be integrated in one processing module. The integrated modules may be implemented in hardware or in software functional modules. Optionally, the division of the modules in the embodiment of the present application is schematic, which is merely a logic function division, and other division manners may be implemented in practice.

The embodiment of the present application further provides a hardware structure schematic of a controller, as shown in fig. 11, where the controller 3000 includes a processor 3001, and optionally, a memory 3002 and a communication interface 3003 connected to the processor 3001. The processor 3001, the memory 3002, and the communication interface 3003 are connected by a bus 3004.

The processor 3001 may be a central processing unit (central processing unit, CPU), a general purpose processor network processor (network processor, NP), a digital signal processor (digital signal processing, DSP), a microprocessor, a microcontroller, a programmable logic device (programmable logic device, PLD), or any combination thereof. The processor 3001 may also be any other apparatus having processing functionality, such as a circuit, a device, or a software module. The processor 3001 may also include a plurality of CPUs, and the processor 3001 may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, or processing cores for processing data (e.g., computer program instructions).

The memory 3002 may be a read-only memory (ROM) or other type of static storage device, a random access memory (random access memory, RAM) or other type of dynamic storage device that may store static information and instructions, or an electrically erasable programmable read-only memory (electrically erasable programmable read-only memory, EEPROM), a compact disc read-only memory (compact disc read-only memory) or other optical disk storage, optical disk storage (including compact discs, laser discs, optical discs, digital versatile discs, blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, as embodiments of the application are not limited in this respect. The memory 3002 may be separate or integrated with the processor 3001. Wherein the memory 3002 may contain computer program code. The processor 3001 is configured to execute computer program codes stored in the memory 3002, thereby implementing the control method provided by the embodiment of the present application.

The communication interface 3003 may be used to communicate with other devices or communication networks (e.g., ethernet, radio access network (radio access network, RAN), wireless local area network (wireless local area networks, WLAN), etc.). The communication interface 3003 may be a module, a circuit, a transceiver, or any device capable of enabling communications.

Bus 3004 may be a peripheral component interconnect standard (peripheral component interconnect, PCI) bus or an extended industry standard architecture (extended industry standard architecture, EISA) bus, among others. The bus 3004 may be classified into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 11, but not only one bus or one type of bus.

Embodiments of the present invention also provide a computer-readable storage medium including computer-executable instructions that, when executed on a computer, cause the computer to perform a method as provided in the above embodiments.

The embodiment of the present invention also provides a computer program product, which can be directly loaded into a memory and contains software codes, and the computer program product can implement the method provided by the above embodiment after being loaded and executed by a computer.

Those skilled in the art will appreciate that in one or more of the examples described above, the functions described in the present application may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, these functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.

From the foregoing description of the embodiments, it will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of functional modules is illustrated, and in practical application, the above-described functional allocation may be implemented by different functional modules according to needs, i.e. the internal structure of the apparatus is divided into different functional modules to implement all or part of the functions described above.

In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the above-described embodiments of the apparatus are merely illustrative, and the division of modules or units, for example, is merely a logical function division, and other manners of division are possible when actually implemented. For example, multiple units or components may be combined or may be integrated into another device, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and the parts shown as units may be one physical unit or a plurality of physical units, may be located in one place, or may be distributed in a plurality of different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units. The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a readable storage medium. Based on such understanding, the technical solution of the embodiments of the present application may be essentially or a part contributing to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, including several instructions for causing a device (may be a single-chip microcomputer, a chip or the like) or a processor (processor) to perform all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk, etc.

The foregoing is merely illustrative of specific embodiments of the present application, and the scope of the present application is not limited thereto, but any changes or substitutions within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A liquid nitrogen plant (100), characterized by comprising:

a storage tank (101);

the first liquid inlet valve (102) is connected with the bottom of the storage tank (101) through a first liquid inlet pipeline;

the second liquid inlet valve (103) is connected with the top of the storage tank (101) through a second liquid inlet pipeline;

a first temperature sensor (120) provided in the tank (101) for detecting a temperature value inside the tank (101);

a full-measuring valve (116) connected with the top of the storage tank (101) through a full-measuring pipeline;

the second temperature sensor (121) is arranged on the full-measuring pipeline and is used for detecting the temperature value of the full-measuring pipeline;

the emptying valve (112) is connected with the top of the storage tank (101) through an emptying pipeline;

a liquid supply pump (107) connected with the storage tank (101) through a liquid supply pipeline;

a third temperature sensor (122) provided at the discharge port of the liquid supply pump (107) and configured to detect a discharge temperature value of the liquid supply pump (107); the method comprises the steps of,

a controller (117) configured to:

when the liquid nitrogen equipment (100) needs to be filled, acquiring a first temperature value of the interior of the storage tank (101) at a first moment through the first temperature sensor (120);

if the first temperature value is smaller than or equal to a first temperature threshold value, controlling the first liquid inlet valve (102) to be opened; or alternatively, the process may be performed,

If the first temperature value is larger than the first temperature threshold value, controlling the second liquid inlet valve (103) to be opened;

acquiring a second temperature value inside the storage tank (101) at a second moment by the first temperature sensor (120), wherein the second moment is positioned after the first moment;

if the second temperature value is smaller than or equal to the first temperature threshold value, the second liquid inlet valve (103) is controlled to be closed, and the first liquid inlet valve (102) is controlled to be opened;

controlling the opening of the full-measuring valve (116) while controlling the opening of the first liquid inlet valve (102);

acquiring a temperature value of the full-length pipeline through the second temperature sensor (121) after the full-length valve (116) is opened;

when the temperature value of the full-measuring pipeline is smaller than a second temperature threshold value, the first liquid inlet valve (102) and the full-measuring valve (116) are controlled to be closed;

-obtaining said discharge temperature value by means of said third temperature sensor (122) when said liquid nitrogen device (100) is supplied externally;

controlling the blow-off valve (112) to open when the discharge temperature value is greater than a third temperature threshold; or alternatively, the process may be performed,

-controlling the purge valve (112) to close when the discharge temperature value is less than or equal to the third temperature threshold.

2. The liquid nitrogen device (100) of claim 1, wherein the liquid nitrogen device (100) further comprises:

a first pressure sensor (123) provided at a discharge port of the liquid supply pump (107) and configured to detect a discharge pressure value of the liquid supply pump (107); the method comprises the steps of,

the controller (117) is further configured to:

when the liquid nitrogen equipment (100) is supplied with liquid outwards, acquiring a first discharge pressure value at a third moment through the first pressure sensor (123);

and controlling the liquid supply pump (107) to increase the rotating speed when the first discharge pressure value is smaller than a first pressure threshold value.

3. The liquid nitrogen device (100) of claim 2, wherein the liquid nitrogen device (100) further comprises:

a pressure increasing valve (104) connected to the tank (101); the method comprises the steps of,

the controller (117), after controlling the liquid supply pump (107) to increase the rotational speed, is further configured to:

acquiring a second discharge pressure value at a fourth time by the first pressure sensor (123), the fourth time being located after the third time, and a time interval between the fourth time and the third time being equal to a preset time interval;

And when the second discharge pressure value is smaller than the first pressure threshold value, controlling the booster valve (104) to be opened until the discharge pressure value detected by the first pressure sensor (123) is equal to the first pressure threshold value.

4. The liquid nitrogen device (100) of claim 1, wherein the liquid nitrogen device (100) further comprises:

a second pressure sensor (124) provided in the interlayer of the tank (101) for detecting a pressure value in the interlayer of the tank (101); the method comprises the steps of,

the controller (117) is further configured to:

acquiring a pressure value in an interlayer of the storage tank (101) by the second pressure sensor (124);

and when the pressure value in the interlayer of the storage tank (101) is smaller than a second pressure threshold value, sending out prompt information for prompting the vacuumizing operation of the liquid nitrogen equipment (100).

5. The liquid nitrogen device (100) of claim 1, wherein the liquid nitrogen device (100) further comprises:

a driving safety valve (113) connected with the top of the storage tank (101);

the third pressure sensor (125) is arranged at the top of the storage tank (101) and is used for acquiring the pressure value inside the storage tank (101); the method comprises the steps of,

the controller (117) is further configured to:

-acquiring a pressure value inside the tank (101) by means of the third pressure sensor (125) during transportation of the liquid nitrogen plant (100);

when the pressure value in the storage tank (101) is larger than a third pressure threshold value, controlling the running safety valve (113) to be opened; or alternatively, the process may be performed,

and when the pressure value in the storage tank (101) is smaller than or equal to the third pressure threshold value, controlling the running safety valve (113) to be closed.

6. A control method suitable for the liquid nitrogen plant according to any one of claims 1 to 5, characterized in that it comprises:

when the liquid nitrogen equipment needs to be filled with liquid, a first temperature value of the interior of the storage tank at a first moment is obtained;

if the first temperature value is smaller than or equal to a first temperature threshold value, controlling a first liquid inlet valve to be opened;

or if the first temperature value is greater than the first temperature threshold value, controlling the second liquid inlet valve to be opened;

acquiring a second temperature value of the interior of the storage tank at a second moment, wherein the second moment is positioned after the first moment;

if the second temperature value is smaller than or equal to the first temperature threshold value, the second liquid inlet valve is controlled to be closed, and the first liquid inlet valve is controlled to be opened;

Controlling the opening of the full-measuring valve while controlling the opening of the first liquid inlet valve;

after the full-measuring valve is opened, acquiring a temperature value of the full-measuring pipeline through the second temperature sensor;

when the temperature value of the full-measuring pipeline is smaller than a second temperature threshold value, the first liquid inlet valve and the full-measuring valve are controlled to be closed;

when the liquid nitrogen equipment supplies liquid outwards, the discharge temperature value is obtained through the third temperature sensor;

when the discharge temperature value is greater than a third temperature threshold value, controlling the vent valve to be opened; or alternatively, the process may be performed,

and when the discharge temperature value is less than or equal to the third temperature threshold value, controlling the vent valve to be closed.