CN111288296A - Control device and method of nitrogen replacement equipment - Google Patents

Control device and method of nitrogen replacement equipment Download PDF

Info

Publication number
CN111288296A
CN111288296A CN202010094634.3A CN202010094634A CN111288296A CN 111288296 A CN111288296 A CN 111288296A CN 202010094634 A CN202010094634 A CN 202010094634A CN 111288296 A CN111288296 A CN 111288296A
Authority
CN
China
Prior art keywords
nitrogen
control
value
pressure
pressure value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010094634.3A
Other languages
Chinese (zh)
Inventor
张宏伟
赵玉龙
张小平
冯涛
李勇
郑国真
张士强
周小义
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lanjian Spaceflight Technology Co ltd
Landspace Technology Co Ltd
Original Assignee
Lanjian Spaceflight Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lanjian Spaceflight Technology Co ltd filed Critical Lanjian Spaceflight Technology Co ltd
Priority to CN202010094634.3A priority Critical patent/CN111288296A/en
Publication of CN111288296A publication Critical patent/CN111288296A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/021—Special adaptations of indicating, measuring, or monitoring equipment having the height as the parameter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/025—Special adaptations of indicating, measuring, or monitoring equipment having the pressure as the parameter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/026—Special adaptations of indicating, measuring, or monitoring equipment having the temperature as the parameter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/04—Arrangement or mounting of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • F17C5/06—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with compressed gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/02—Pipe-line systems for gases or vapours
    • F17D1/04—Pipe-line systems for gases or vapours for distribution of gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/08—Pipe-line systems for liquids or viscous products
    • F17D1/14—Conveying liquids or viscous products by pumping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D3/00—Arrangements for supervising or controlling working operations
    • F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D5/00—Protection or supervision of installations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/014—Nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0107—Single phase
    • F17C2223/013—Single phase liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0107—Single phase
    • F17C2225/0123—Single phase gaseous, e.g. CNG, GNC
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0135—Pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0302—Heat exchange with the fluid by heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0367—Localisation of heat exchange
    • F17C2227/0388—Localisation of heat exchange separate
    • F17C2227/039—Localisation of heat exchange separate on the pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/04—Methods for emptying or filling
    • F17C2227/044—Methods for emptying or filling by purging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/03—Control means
    • F17C2250/032—Control means using computers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/0421—Mass or weight of the content of the vessel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/06—Controlling or regulating of parameters as output values
    • F17C2250/0605—Parameters
    • F17C2250/0626—Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/06—Controlling or regulating of parameters as output values
    • F17C2250/0605—Parameters
    • F17C2250/0631—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/06—Controlling or regulating of parameters as output values
    • F17C2250/0689—Methods for controlling or regulating
    • F17C2250/0694—Methods for controlling or regulating with calculations

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The present invention provides a control device of a nitrogen gas replacement apparatus, wherein the nitrogen gas replacement apparatus includes a heater (300), and the control device of the nitrogen gas replacement apparatus includes: the temperature acquisition module is used for acquiring the temperature of the nitrogen at the outlet of the heater (300); a pressure acquisition module for acquiring a first pressure value of the filled device (500); the first control module is used for carrying out PI control or PID control according to the absolute value of the deviation of the outlet nitrogen temperature and a preset temperature value; and a second control module for performing PI control or PID control according to the deviation of the first pressure value of the filled device (500) and the first preset pressure value of the filled device (500). The control device of the nitrogen replacement equipment can ensure constant temperature and constant pressure of nitrogen supply, high control precision and measurement precision are both considered, and time and labor cost can be saved.

Description

Control device and method of nitrogen replacement equipment
Technical Field
The invention relates to the field of replacement of containers by using inert gas before use, in particular to a control device and a method of nitrogen replacement equipment.
Background
Certain fields (e.g., aerospace, automotive, etc.) may involve nitrogen displacement operations within pipes or vessels, for example, the application of nitrogen displacement may be as follows:
the first condition is as follows: the pipe or vessel through which the combustible gas passes is subjected to nitrogen substitution before use. The purpose is to displace the air in the pipeline, avoid combustible gas and oxygen in the air to form a combustible mixture, and prevent internal combustion or explosion.
Case two: some clean pipes or containers need to be isolated from oxygen, for example, to reduce the contamination rate of some media, nitrogen should be used to replace the air in advance.
Taking the aerospace field as an example, in the nitrogen replacement process of conventional equipment, the nitrogen is usually used in a small amount, and the nitrogen cylinder group and the small nitrogen replacement equipment can meet the requirements by matching with manual operation. For devices with large nitrogen demand, such as rocket liquid storage tanks, liquefied nitrogen is required to meet nitrogen supply, and the existing nitrogen displacement devices and manual operation modes cannot meet the requirements.
In view of this, it is desirable to design a control apparatus and method for nitrogen substitution equipment, which have the functions of clear structure, stable operation, high reliability, high readability, maintainability, high integration degree of the program, high safety and standardization degree, high control precision and high measurement precision, and save time and labor cost.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a control device and a control method of nitrogen replacement equipment with high integration and high precision.
The invention provides a control device of nitrogen gas replacement equipment, wherein the nitrogen gas replacement equipment comprises a heater, and the control device of the nitrogen gas replacement equipment comprises: the temperature acquisition module is used for acquiring the temperature of the nitrogen at the outlet of the heater; the pressure acquisition module is at least used for acquiring a first pressure value of the filled equipment; the first control module is used for carrying out PI control or PID control according to the absolute value of the deviation of the outlet nitrogen temperature and a preset temperature value; and the second control module is used for carrying out PI control or PID control according to the deviation of the first pressure value of the filled device and the first preset pressure value of the filled device.
According to an aspect of the present invention, the second control module is further configured to select a pressure regulation mode according to a deviation degree between the first preset pressure value and the first pressure value, wherein when an absolute value of the deviation exceeds a first pressure threshold, the switching value control is performed, and when the absolute value of the deviation is smaller than the first pressure threshold and larger than a second pressure threshold, the analog value control is performed, wherein the analog value control includes the above PI control or PID control.
According to an aspect of the invention, wherein the nitrogen gas replacement device includes a nitrogen gas buffer, the pressure acquisition module further includes: the second pressure acquisition module is used for acquiring a second pressure value of the nitrogen buffer, and the second control module is also used for controlling the valve switch and the plunger pump unit of the nitrogen buffer to start and stop by comparing the second pressure value with a relation between a second preset pressure value and a third preset pressure value of the nitrogen buffer, wherein the second preset pressure value is greater than the third preset pressure value.
According to an aspect of the present invention, the nitrogen substitution device includes a liquid nitrogen storage, and the control means of the nitrogen substitution device further includes: the liquid level acquisition module is used for acquiring a liquid nitrogen level value of the liquid nitrogen storage; and the third control module is used for performing operation control such as liquid nitrogen adding or shutdown according to the liquid nitrogen level value.
According to an aspect of the present invention, the control device of the nitrogen substituting apparatus further includes: the dew point acquisition module is used for acquiring the quality of the nitrogen at the outlet of the nitrogen buffer; and the fourth control module is used for controlling whether the nitrogen is conveyed or not according to the quality of the nitrogen.
According to another aspect of the present invention, there is provided a control method of a nitrogen gas replacement apparatus, employing a control device of the nitrogen gas replacement apparatus, the control method of the nitrogen gas replacement apparatus including at least temperature control of a heater and pressure control of a filling apparatus:
wherein the temperature control of the heater comprises: collecting a temperature value of nitrogen at an outlet of a heater; taking the difference value between the temperature value and a preset temperature value as input, and regulating the output power of the heater after PI or PID operation to enable the temperature of the outlet nitrogen to meet the requirement;
the pressure control of the filling device comprises: opening a regulating valve of the nitrogen buffer to enable nitrogen to be delivered into the filled equipment; collecting a first pressure value of the filled equipment, and calculating a first deviation between the first preset pressure value and the first pressure value; if the first deviation absolute value exceeds a first pressure threshold value, controlling the state of an adjusting valve through a switching value; if the first deviation absolute value is smaller than a first pressure threshold value and larger than a second pressure threshold value, performing PI control or PID control; and when the first deviation is within the allowable range, opening an emptying valve of the filled equipment after the pressure is stabilized, and recovering the first pressure value to the normal pressure.
According to an aspect of the present invention, the control method of the nitrogen substituting apparatus further includes: and measuring the oxygen concentration value inside the filled equipment, and when the oxygen concentration value is higher than the set concentration value, circulating the control method of the nitrogen gas replacement equipment again until the oxygen concentration reaches or is lower than the set oxygen concentration value.
According to one aspect of the present invention, the method for controlling the nitrogen gas replacement device further includes starting interlock protection control, specifically: and if the first pressure value exceeds a limit pressure value, closing a switch valve of the filled equipment, or reducing the output power of the heater when the output power of the heater exceeds a limit power value.
According to an aspect of the present invention, the nitrogen gas replacement apparatus includes a plunger pump unit, and the control method of the nitrogen gas replacement apparatus further includes: collecting a second pressure value of the nitrogen buffer, stopping the plunger pump unit when the second pressure value is higher than a second preset pressure value, closing an inlet switch valve of the nitrogen buffer, and opening an emptying valve of the nitrogen buffer; when the second pressure value is smaller than a second preset pressure value, closing an emptying valve of the nitrogen buffer; and when the second pressure value is smaller than a third pressure preset value, opening an inlet valve of the nitrogen buffer, and starting the plunger pump unit.
According to an aspect of the invention, the first pressure threshold is 10% -20% of the first preset pressure value, and the second pressure threshold is 1% -10% of the first preset pressure value.
According to the control device of the nitrogen replacement equipment, provided by the invention, the temperature of the outlet nitrogen of the heater is acquired through the temperature acquisition module, and the first control module performs PI control or PID control according to the absolute value of the deviation of the nitrogen temperature and a preset temperature value, so that the nitrogen temperature is ensured to be constant; the first pressure value of the filled device is collected through the first pressure collecting module, the preset pressure value of the filled device is set to be the first preset pressure value, and the second control module is used for carrying out PI control or PID control according to the deviation between the first preset pressure value and the first pressure value of the filled device, so that the constancy of the nitrogen pressure is guaranteed. The control device of the nitrogen gas replacement equipment has the characteristics of clear structure, stable operation and high reliability, the readability, maintainability and integration degree of the program are high, the safety and standardization degree are high, the high control precision and the high measurement precision are considered, and meanwhile, the time and the labor cost can be saved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic diagram of a nitrogen displacement apparatus according to one embodiment of the present invention;
FIG. 2 is a schematic view of a control device of the nitrogen substituting apparatus according to one embodiment of the present invention;
FIG. 3 is a schematic view of a control device of a nitrogen substituting apparatus according to still another embodiment of the present invention;
fig. 4 is a partial flowchart of a method of controlling the nitrogen substitution device according to the embodiment of the present invention.
Description of reference numerals:
100-liquid nitrogen storage, 200-vaporization unit, 300-heater, 400-nitrogen buffer, 500-filled device, 501-first filled device, 502-second filled device, 503-third filled device, 600-plunger pump unit, 701-first switching valve, 702-second switching valve, 703-third switching valve, 801-first regulating valve, 802-second regulating valve, 803-third regulating valve.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention, for the purposes of illustrating the principles of the invention. Additionally, the components in the drawings are not necessarily to scale. For example, the dimensions of some of the elements or regions in the figures may be exaggerated relative to other elements or regions to help improve understanding of embodiments of the present invention.
The directional terms used in the following description are used in the illustrated directions, and do not limit the specific configurations of the embodiments of the present invention. In the description of the present invention, it should be noted that, unless otherwise specified, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.
Furthermore, the terms "comprises," "comprising," "includes," "including," "has," "having" or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a structure or component comprising a list of elements does not include only those elements but may include other mechanical components not expressly listed or inherent to such structure or component. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of additional like elements in the article or device comprising the element.
Spatially relative terms such as "below," "… below," "lower," "above," "… above," "upper," and the like are used for convenience in describing the positioning of one element relative to a second element and are intended to encompass different orientations of the device in addition to different orientations than those illustrated in the figures. Further, for example, the phrase "one element is over/under another element" may mean that the two elements are in direct contact, or that there is another element between the two elements. Furthermore, terms such as "first", "second", and the like, are also used to describe various elements, regions, sections, etc. and should not be taken as limiting. Like terms refer to like elements throughout the description.
It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.
FIG. 1 is a schematic view of a nitrogen displacement apparatus according to an embodiment of the present invention; FIG. 2 is a schematic view of a control device of the nitrogen substituting apparatus according to one embodiment of the present invention; FIG. 3 is a schematic view of a control device of a nitrogen substituting apparatus according to still another embodiment of the present invention; fig. 4 is a partial flowchart of a method for controlling the nitrogen substitution device according to the embodiment of the present invention.
As shown in fig. 1, the present invention provides a nitrogen gas replacement apparatus comprising: the nitrogen filling device comprises a liquid nitrogen storage 100, a vaporization unit 200, a heater 300 and a nitrogen buffer 400, wherein the liquid nitrogen storage 100 is used for supplying liquid nitrogen to the vaporization unit 200, the vaporization unit 200 is used for vaporizing the liquid nitrogen and then delivering the vaporized liquid nitrogen to the heater 300, the heater 300 is used for heating and adjusting nitrogen flowing through and then delivering the adjusted nitrogen to the nitrogen buffer 400, and the nitrogen buffer 400 is used for buffering the heated nitrogen and delivering the nitrogen to the filled device 500 for nitrogen replacement.
The nitrogen displacement equipment provided by the invention prepares nitrogen after vaporization of liquid nitrogen, and the generated nitrogen has the characteristics of high purity, low impurity and the like, and is suitable for the demand of displacement medium of a large-flow device. The nitrogen storage unit 100 in the nitrogen substitution apparatus is used for storing liquid nitrogen, an outlet of the nitrogen storage unit 100 is connected to the vaporizing unit 200 and supplies the liquid nitrogen to the vaporizing unit 200, the vaporizing unit 200 converts the liquid nitrogen from a liquid state into gaseous nitrogen, the vaporized nitrogen is supplied to the heater 300, the heater 300 raises the temperature of the low-temperature nitrogen generated from the vaporizing unit 200 to a predetermined temperature, the nitrogen reaching the predetermined temperature is transferred to the nitrogen buffer 400, and the nitrogen buffer 400 is used for buffering the heated nitrogen and supplying the nitrogen to the filled apparatus 500 for nitrogen substitution. This nitrogen gas replacement equipment can carry out effective control to the temperature of nitrogen gas, and nitrogen gas reaches preset temperature value and can more be applicable to actual user demand, guarantees to be more smooth and easy when replacing nitrogen gas by filling device 500, and the replacement process is more effective.
Specifically, nitrogen gas replacement equipment is used for being heated to suitable temperature behind the nitrogen gas transformation with liquid nitrogen, carries out by the nitrogen gas replacement of filling equipment 500, provides the nitrogen gas supply of high integration degree and function integration, satisfies the user demand that can provide constant temperature constant voltage nitrogen gas in order to satisfy large capacity device nitrogen gas replacement in succession. Specifically, the nitrogen gas replacement device can be applied to filled devices needing nitrogen gas replacement, such as a storage tank of a liquid rocket, a high-pressure gas cylinder group and the like, so that the nitrogen gas can be supplied in multiple functions, and the problem that multiple filled devices simultaneously perform nitrogen gas replacement under the condition of low cost is solved.
According to an aspect of the present invention, the nitrogen substitution device further includes a plunger pump unit 600 communicating between the liquid nitrogen storage 100 and the vaporizing unit 200 for delivering the liquid nitrogen of the liquid nitrogen storage 100 to the vaporizing unit 200. The plunger pump unit 600 has a function of transferring liquid nitrogen in the middle, and the liquid nitrogen is transferred from the liquid nitrogen storage 100 to the vaporizing unit 200, so that the transfer of the liquid nitrogen can be controlled by adjusting the plunger pump unit 600, and the reliability and safety of the transfer are ensured. Plunger pump unit 600 in this application is the special pump that is used for carrying liquid among the chemical plant device, can carry the high place of pressure with liquid from the place that pressure is low, compromises functions such as adjusting the big or small velocity of flow of carrying liquid nitrogen simultaneously.
According to an aspect of the present invention, in order to make the delivery of liquid nitrogen or nitrogen gas adjustable during the nitrogen substitution, the nitrogen substitution apparatus is further provided with switching valves including a first switching valve 701 provided between the liquid nitrogen storage 100 and the plunger pump unit 600, a second switching valve 702 provided between the heater 300 and the nitrogen buffer 400, and a third switching valve 703 provided at the outlet of the nitrogen buffer 400. A first switching valve 701 is provided between the liquid nitrogen storage 100 and the plunger pump unit 600 for controlling the supply of liquid nitrogen to the pipeline, a second switching valve 702 is provided between the heater 300 and the nitrogen buffer 400 for controlling the supply of vaporized nitrogen to the pipeline, and a third switching valve 703 is provided at the outlet of the nitrogen buffer 400 for controlling the discharge of nitrogen from the nitrogen buffer 400, wherein in one case, the third switching valve is opened for pressure adjustment when the pressure in the nitrogen buffer 400 exceeds a predetermined value. The switch valve not only has the on-off function, but also has the function of protecting equipment against overpressure.
According to an aspect of the present invention, in order to make the flow rate of nitrogen gas adjustable during the nitrogen gas replacement to the filled device, the nitrogen gas replacement device is further provided with an adjustment valve, which is provided between the nitrogen buffer 400 and the filled device 500, and between each filled device and the nitrogen buffer 400. One or more than one filled device 500 can be provided, and as shown in fig. 3, three filled devices are provided, namely a first filled device 501, a second filled device 502 and a third filled device 503, and a first regulating valve 801, a second regulating valve 802 and a third regulating valve 803 are correspondingly provided. Each filled device 500 is connected with the nitrogen buffer 400 through an adjusting valve respectively, so that the nitrogen flow of each filled device 500 in nitrogen replacement is adjustable, the adjusting valve can adjust the pressure and flow of nitrogen in subsequent pipelines, the pressure and flow of nitrogen in the transmission process are controllable, and the nitrogen replacement process is more reliable and safer.
According to one aspect of the present invention, the heater 300 includes a thyristor assembly and a heating assembly, and the thyristor assembly regulates power of the heating assembly. The thyristor assembly can control the high-power heating assembly with low power, adjust the power of the heating assembly to adjust the temperature of the nitrogen flowing through the heater 300, and convey the nitrogen to the nitrogen buffer 400 after the nitrogen reaches a preset temperature value. The nitrogen gas of heating to the uniform temperature can effectively reduce by the impurity content of filling equipment replacement in-process, owing to probably contain vapor by filling equipment 500, nitrogen gas temperature is crossed lowly and can be made vapor become water droplet or ice sediment, and the nitrogen gas after the heating can effectively solve above-mentioned problem. Meanwhile, the heater 300 can shorten the time for replacing the nitrogen gas, increase the limit nitrogen gas amount of the filled device 500, and reduce the oxygen concentration after the final replacement by the filled device 500.
According to an aspect of the present invention, a control device of a nitrogen substituting apparatus includes: the upper computer software is used for communicating with the lower computer, displaying the signals acquired by the data acquisition assembly to a human-computer interface in a numerical form, and performing human-computer interaction control by an operator; and the lower computer is used for bearing built-in programs to realize functions of storage, signal conversion, judgment, execution, feedback and the like.
The whole nitrogen gas replacement device can be monitored and controlled by an operator by means of upper computer software, namely man-machine interaction software, and the functions of the nitrogen gas replacement device comprise detection point display, parameter setting, data storage, operation records, user authority setting, data report forms and the like. The lower computer is a programmable logic controller and is used for bearing a built-in program to realize the functions of storage, signal conversion, judgment, execution, feedback and the like. Based on the technical field, the lower computer is not limited to the programmable logic controller, and other controllers capable of realizing the function can be used.
Detection point display, parameter setting and data storage: by means of communication protocols such as Ethernet and the like, data exchange is carried out between the human-computer interaction software and the programmable logic controller, wherein the display of the detection points is that numerical values of all detection positions in the measurement and control system are displayed on a human-computer interface; the parameter setting is that an operator sets parameters according to the actual condition of the current system; the data storage is to select the detection point for storage according to the requirement.
And (4) operation recording: various operations executed by an operator are recorded so as to ensure the normativity, the standard property, the rationality and the safety of the operations, and meanwhile, when a test has a problem, the current operation condition can be restored so as to provide data support.
And (3) permission setting: and setting the authority for the personnel, wherein the personnel at the same level have the same operation authority, and only the personnel with the authority can execute corresponding operation.
And (4) reporting the data: the recorded data can be displayed in a table form, so that design or process personnel can analyze test phenomena, problems, results and the like conveniently, and data reference is provided.
The lower computer (i.e. programmable logic controller) is the core part of the whole measurement and control system and is responsible for the functions of storage, signal conversion, judgment, execution, feedback and the like of a control program. The lower computer programming software can write, modify, download, upload and monitor programs on line. The program can be divided into a main program and a subprogram according to functions, and the subprogram can be subdivided into subprogram modules such as initialization, manual control, temperature control, pressure control, linkage control and the like.
The main program is responsible for logic judgment, execution, subprogram calling, execution and the like of the whole program.
The initialization is performed once after the programmable logic controller is powered on or manually operated by an operator to restore the parameters or equipment to the initial setting state.
The manual control means that under the non-automatic control state, an operator can remotely or locally operate the equipment.
The temperature control is to regulate the temperature of the nitrogen generated by the vaporizer to meet the actual use requirement.
The pressure control adjusts and controls the pressure of the buffer tank or the pressure of the product (rocket tank or high-pressure gas cylinder group, etc.).
The interlocking control is a software program mode, which is mutually exclusive to the state of the equipment or causes the equipment to execute certain operation under certain conditions.
As shown in fig. 2, the present invention provides a control apparatus of a nitrogen substitution device, wherein the nitrogen substitution device includes a heater 300, and the control apparatus of the nitrogen substitution device includes: the temperature acquisition module is used for acquiring the temperature of the nitrogen at the outlet of the heater 300; a pressure acquisition module at least for acquiring a first pressure value of the filled device 500; the first control module is used for carrying out PI control or PID control according to the absolute value of the deviation of the outlet nitrogen temperature and a preset temperature value; and a second control module for performing PI control or PID control according to a deviation of the first pressure value of the filled device 500 from a first preset pressure value.
The control device of the nitrogen replacement equipment comprises temperature and pressure control, wherein a temperature acquisition module and a first control module are arranged in a module involved in the temperature control, the temperature acquisition module is used for acquiring the outlet nitrogen temperature of the heater 300, and the first control module is used for performing PI control or PID control according to the absolute value of the deviation between the outlet nitrogen temperature and the preset temperature value. This control mode adopts analog quantity control, heater 300 contains silicon controlled rectifier subassembly and heating element, the power of heating element is adjusted to the silicon controlled rectifier subassembly, utilize current signal control silicon controlled rectifier subassembly rectification direct current voltage regulator output, thereby adjust heating element's power, its algorithm is PI control or PID control, the deviation of export nitrogen gas temperature and preset temperature value is as the input promptly, through PI or PID operation, output control signal, the output of adjustment silicon controlled rectifier subassembly and heating element's power, thereby carry out the nitrogen gas temperature control of nitrogen gas replacement equipment.
The pressure control module comprises a pressure acquisition module and a second control module, the pressure acquisition module is used for acquiring a first pressure value of the filled device 500, and the second control module is used for performing PI control or PID control according to the deviation between the first pressure value of the filled device 500 and a first preset pressure value of the filled device 500. The control mode also adopts analog quantity control, the deviation between the first preset pressure value and the first pressure value of the filled device 500 is used as input, a control signal is output through PI or PID operation, and PI or PID control is started for fine adjustment to prevent large overshoot.
Specifically, the temperature control of the heater 300 and the pressure control of the filled device 500 are controlled by PI or PID analog quantities, and the automatic temperature and pressure control of the full nitrogen replacement device can be completed, so that the temperature and pressure of the full nitrogen replacement process can be adjusted. Guarantee that nitrogen gas replacement in-process nitrogen gas reaches preset temperature value and can more be applicable to the user demand of reality, can guarantee more smoothly when replacing nitrogen gas by filling device 500, is guaranteed the replacement process safety by filling device 500's controllable assurance of pressure, and the replacement efficiency is more effective.
According to one aspect of the invention, the second control module is further configured to select a pressure regulation mode according to a degree of deviation of the first preset pressure value from the first pressure value, wherein the switching value control is performed when an absolute value of the deviation exceeds a first pressure threshold value. And when the absolute value of the deviation is smaller than the first pressure threshold value and larger than the second pressure threshold value, performing analog quantity control, wherein the analog quantity control comprises the PI control or the PID control. Specifically, the pressure control of the filled device 500 may employ a dual control scheme of on-off control and analog control. The switching value control selects when the absolute value of deviation exceeds first pressure threshold value, because the pressure volume of control is great, do not need accurate control, keep in certain within range can, regulating switch sets up to the aperture great or open completely for can reach first preset pressure value fast by filling equipment 500. And when the absolute value of the deviation is smaller than the first pressure threshold value and larger than the second pressure threshold value, the analog quantity control selection adopts PI or PID control to carry out fine adjustment, so that the phenomenon of large overshoot is prevented, and the pressure value of the filled equipment 500 is automatically positioned at a first preset pressure value.
According to one aspect of the invention, the first pressure threshold is 10% -20% of the first preset pressure value and the second pressure threshold is 1% -10% of the first preset pressure value.
As shown in fig. 3, according to an aspect of the present invention, wherein the nitrogen substitution device includes a nitrogen buffer 400, the pressure acquisition module further includes: and the second pressure acquisition module is used for acquiring a second pressure value of the nitrogen buffer 400, and the second control module is further used for controlling the valve switch of the nitrogen buffer 400 and the start and stop of the plunger pump unit by comparing the second pressure value with a second preset pressure value of the nitrogen buffer 400. Similarly, the pressure acquisition module can acquire the pressure of the nitrogen buffer 400 for pressure control, and a second pressure acquisition module is arranged and controlled by the second control module, and the second preset pressure value of the nitrogen buffer 400 can be set according to the equipment requirement. The on-off of the valve is controlled by collecting the pressure value of the nitrogen buffer 400 in real time, and when the implementation pressure value exceeds the preset pressure value, the operation of closing the valve is executed.
According to an aspect of the present invention, the control device of the nitrogen substituting apparatus further includes: the liquid level acquisition module is used for acquiring a liquid nitrogen level value of the liquid nitrogen storage 100; and the third control module is used for performing operation control such as liquid nitrogen adding or shutdown according to the liquid level value of the liquid nitrogen. The liquid level value of the liquid nitrogen in the liquid nitrogen storage 100 in the storage tank is collected through the liquid level collecting module, the service condition of the liquid nitrogen can be monitored at any time, the storage amount of the liquid nitrogen can be gradually reduced according to consumption in the nitrogen replacement process, and when the liquid level value of the liquid nitrogen is reduced to a certain threshold value, the third control module performs operation control such as adding the liquid nitrogen or stopping the machine or performs alarm prompt.
According to an aspect of the present invention, the control device of the nitrogen substituting apparatus further includes: the dew point acquisition module is used for acquiring the quality of the nitrogen at the outlet of the nitrogen buffer 400; and the fourth control module is used for controlling whether the nitrogen is conveyed or not according to the quality of the nitrogen. The dew point acquisition module is installed at the outlet of the nitrogen buffer 400, the quality and quality of nitrogen are detected, the nitrogen directly enters the filled equipment 500 after coming out of the nitrogen buffer 400, the quality and quality of the nitrogen are key links in the nitrogen replacement process, and the fourth control module disconnects the nitrogen conveying when the quality of the nitrogen is unqualified.
According to another aspect of the present invention, there is provided a control method of a nitrogen gas replacement apparatus using a control device of the nitrogen gas replacement apparatus, the control method of the nitrogen gas replacement apparatus including at least temperature control of the heater 300 and pressure control of the filling apparatus 500.
Wherein the temperature control of the heater 300 includes: collecting the temperature value of the nitrogen at the outlet of the heater 300; and taking the difference value between the temperature value and the preset temperature value as input, and regulating the output power of the heater after PI or PID operation to enable the temperature of the outlet nitrogen to meet the requirement. The heater 300 comprises a silicon controlled component and a heating component, wherein the silicon controlled component adjusts the power of the heating component, and controls the output of a rectification direct-current voltage regulator of the silicon controlled component by using a current signal, so that the power of the heating component is adjusted, the algorithm is PI control or PID control, namely, the deviation of the outlet nitrogen temperature and a preset temperature value is used as input, and the output of the silicon controlled component and the power of the heating component are adjusted by outputting a control signal through PI or PID operation, so that the temperature of the nitrogen replacement equipment is controlled. Guarantee that nitrogen gas replacement in-process nitrogen gas reaches preset temperature value and can more be applicable to the user demand of reality, can guarantee to be more smooth and easy when the replacement nitrogen gas by filling equipment 500, the replacement efficiency is more effective.
As shown in fig. 4, the pressure control of the filling apparatus 500 includes: s100, opening a regulating valve of the nitrogen buffer 400 to convey nitrogen into the filled equipment 500; s200, collecting a first pressure value of the filled equipment 500, and calculating a first deviation between a first preset pressure value and the first pressure value; s301, if the absolute value of the first deviation exceeds a first pressure threshold, controlling the state of the regulating valve through a switching value; s302, if the first deviation absolute value is smaller than a first pressure threshold and larger than a second pressure threshold, performing PI control or PID control; and S400, when the first deviation is within the allowable range, opening an emptying valve of the filled equipment 500 after the pressure is stabilized, and recovering the first pressure value to the normal pressure.
Specifically, the pressure control of the filled device 500 may employ a dual control scheme of on-off control and analog control. The switching value control selects when the absolute value of deviation exceeds first pressure threshold value, because the pressure volume of control is great, do not need accurate control, keep in certain within range can, regulating switch sets up to the aperture great or open completely for can reach first preset pressure value fast by filling equipment 500. And when the absolute value of the deviation is smaller than the first pressure threshold value and larger than the second pressure threshold value, the analog quantity control selection adopts PI or PID control to carry out fine adjustment, so that the phenomenon of large overshoot is prevented, and the pressure value of the filled equipment 500 is automatically positioned at a first preset pressure value. Meanwhile, the practicability of the filled device 500 is guaranteed, and after the pressure is kept stable for a period of time, the emptying valve of the filled device 500 can be opened, so that the first pressure value is recovered to the normal pressure. By adopting the control method, the constant temperature and the constant pressure of nitrogen supply in the nitrogen replacement process can be ensured, high control precision and measurement precision are both considered, and overshoot is reduced.
According to an aspect of the present invention, the control method of the nitrogen substituting apparatus further includes: the oxygen concentration value inside the filled device 500 is measured, and when the oxygen concentration value is higher than the set concentration value, the control method of the nitrogen gas substitution device is circulated again until the oxygen concentration reaches the set concentration value. In order to make the replacement of the filled device 500 more complete, the control method of the nitrogen replacement device may be circulated again by detecting the oxygen concentration value inside the filled device 500, if the oxygen concentration value is higher than the set concentration value, the replacement process of the filled device 500 is completed through the pressure adjustment process, and the nitrogen replacement of the filled device 500 is more complete through multiple times of nitrogen replacement, thereby achieving the design requirement.
According to one aspect of the present invention, the method for controlling the nitrogen gas replacement device further includes starting interlock protection control, specifically: if the first pressure value exceeds the limit pressure value, the on-off valve of the filled device 500 is closed, or the output power of the heater 300 is reduced when the output power exceeds the limit power value. In order to ensure the safety of the equipment, the control method of the nitrogen gas replacement equipment also comprises interlocking protection control, and when the first pressure value exceeds the limit pressure value, the switch valve of the equipment 500 to be filled is closed, so that the equipment 500 to be filled is prevented from being damaged. When the output power of the heater 300 exceeds the limit power value, the output power of the heater is reduced, and the situation that the thyristor assembly in the heater 300 is burnt out due to overlarge power is avoided. When the rear pressure of the plunger pump unit 600 is too high, the ball valve in front of the plunger pump unit 600 needs to be closed and the plunger pump unit 600 needs to be stopped, so that the plunger pump unit 600 is prevented from being damaged; when the nitrogen inlet valve is closed, the plunger pump unit 600 is closed.
According to an aspect of the present invention, the nitrogen substituting apparatus includes the plunger pump unit 600, and the control method of the nitrogen substituting apparatus further includes: collecting a third pressure value of the nitrogen buffer 400, stopping the plunger pump unit 600 when the third pressure value is higher than a third preset pressure value, closing an inlet switch valve of the nitrogen buffer 400, and opening an emptying valve of the nitrogen buffer 400; when the second pressure value is smaller than a second preset pressure value, closing an emptying valve of the nitrogen buffer; and when the second pressure value is smaller than a third pressure preset value, opening an inlet valve of the nitrogen buffer, and starting the plunger pump unit. When the second pressure value of the nitrogen buffer 400 exceeds the second preset pressure value, the plunger pump unit 600 is stopped, the inlet switch valve of the nitrogen buffer 400 is closed, the evacuation valve of the nitrogen buffer 400 is opened, when the second pressure value is lower than the second preset pressure value, the evacuation valve of the nitrogen buffer 400 is closed, when the second pressure value is lower than the third preset pressure value, the inlet valve of the nitrogen buffer 400 is opened, and the plunger pump unit 600 is started at the same time, so that the use safety of the nitrogen buffer 400 is ensured, the nitrogen buffer is ensured to work within a certain pressure range, and the nitrogen replacement equipment is ensured to work normally.
The control device of the nitrogen gas replacement equipment provided by the invention has the advantages of clear structure, stable operation, high reliability, high readability, maintainability and integration degree of a program, high safety and standardization degree, and meanwhile, the corresponding method of the control device of the nitrogen gas replacement equipment has the functions of high control precision and measurement precision, and the time and labor cost are saved.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A control device of a nitrogen substituting apparatus, wherein the nitrogen substituting apparatus includes a heater (300), characterized by comprising:
the temperature acquisition module is used for acquiring the temperature of the nitrogen at the outlet of the heater (300);
a pressure acquisition module for acquiring at least a first pressure value of the filled device (500);
the first control module is used for carrying out PI control or PID control according to the absolute value of the deviation of the outlet nitrogen temperature and a preset temperature value; and
and the second control module is used for performing PI control or PID control according to the deviation of the first preset pressure value of the filled device (500) and the first pressure value of the filled device (500).
2. The control device of a nitrogen substitution apparatus according to claim 1, wherein the second control module is further configured to select a pressure regulation mode according to a degree of deviation of the first preset pressure value from the first pressure value, wherein when an absolute value of the deviation exceeds a first pressure threshold, on-off control is performed, and when the absolute value of the deviation is smaller than the first pressure threshold and larger than a second pressure threshold, analog control is performed, wherein the analog control includes the above-mentioned PI control or PID control.
3. The control device of a nitrogen substitution apparatus according to claim 1, wherein the nitrogen substitution apparatus includes a nitrogen buffer (400), characterized in that the pressure acquisition module further includes:
the second pressure acquisition module is used for acquiring a second pressure value of the nitrogen buffer (400), the second control module is also used for controlling the valve switch of the nitrogen buffer (400) and the start and stop of the plunger pump unit (600) by comparing the second pressure value with the relation between a second preset pressure value and a third preset pressure value of the nitrogen buffer (400), wherein the second preset pressure value is greater than the third preset pressure value.
4. The control device of the nitrogen substitution device according to claim 3, wherein the nitrogen substitution device includes a liquid nitrogen storage (100), characterized by further comprising:
the liquid level acquisition module is used for acquiring a liquid nitrogen level value of the liquid nitrogen storage (100);
and the third control module is used for performing operation control such as liquid nitrogen adding or shutdown according to the liquid nitrogen level value.
5. The control device of a nitrogen substitution apparatus according to claim 3, characterized by further comprising:
the dew point acquisition module is used for acquiring the quality of the nitrogen at the outlet of the nitrogen buffer (400);
and the fourth control module is used for controlling whether the nitrogen is conveyed or not according to the quality of the nitrogen.
6. A control method of a nitrogen substitution apparatus, characterized by using the control device of a nitrogen substitution apparatus according to any one of claims 3 to 5, the control method of a nitrogen substitution apparatus comprising at least temperature control of a heater (300) and pressure control of a filling apparatus (500):
wherein the temperature control of the heater (300) comprises:
collecting a temperature value of nitrogen at an outlet of the heater (300);
taking the difference value between the temperature value and a preset temperature value as input, and regulating the output power of the heater after PI or PID operation to enable the temperature of the outlet nitrogen to meet the requirement;
the pressure control of the filling device (500) comprises:
opening a regulating valve of the nitrogen buffer (400) to enable nitrogen to be transmitted into the filled equipment (500);
collecting a first pressure value of the filled device (500), calculating a first deviation of the first preset pressure value from the first pressure value; if the first deviation absolute value exceeds a first pressure threshold value, controlling the state of an adjusting valve through a switching value; if the first deviation absolute value is smaller than a first pressure threshold value and larger than a second pressure threshold value, performing PI control or PID control;
and when the first deviation is within the allowable range, opening an emptying valve of the filled equipment (500) after the pressure is stabilized, and restoring the first pressure value to the normal pressure.
7. The control method of a nitrogen substitution apparatus according to claim 6, characterized by further comprising:
measuring the oxygen concentration value inside the filled device (500), and when the oxygen concentration value is higher than the set concentration value, circulating the control method of the nitrogen gas replacement device again until the oxygen concentration reaches or is lower than the set oxygen concentration value.
8. The method for controlling nitrogen substitution equipment according to claim 7, further comprising starting interlock protection control, specifically:
if the first pressure value exceeds a limit pressure value, a switch valve of the filled device (500) is closed, or the output power of the heater (300) is reduced when the output power exceeds a limit power value.
9. The control method of a nitrogen substitution apparatus according to claim 8, characterized in that the nitrogen substitution apparatus includes a plunger pump unit (600), and the control method of a nitrogen substitution apparatus further includes:
collecting a second pressure value of the nitrogen buffer (400), stopping the plunger pump unit (600) when the second pressure value is higher than a second preset pressure value, closing an inlet switch valve of the nitrogen buffer (400), and opening an emptying valve of the nitrogen buffer (400);
when the second pressure value is smaller than the second pressure preset value, closing an emptying valve of the nitrogen buffer (400);
when the second pressure value is smaller than the third pressure preset value, the inlet valve of the nitrogen buffer is opened, and the plunger pump unit (600) is started.
10. The control method of a nitrogen substitution device according to claim 6, wherein the first pressure threshold is 10% -20% of the first preset pressure value, and the second pressure threshold is 1% -10% of the first preset pressure value.
CN202010094634.3A 2020-02-13 2020-02-13 Control device and method of nitrogen replacement equipment Pending CN111288296A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010094634.3A CN111288296A (en) 2020-02-13 2020-02-13 Control device and method of nitrogen replacement equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010094634.3A CN111288296A (en) 2020-02-13 2020-02-13 Control device and method of nitrogen replacement equipment

Publications (1)

Publication Number Publication Date
CN111288296A true CN111288296A (en) 2020-06-16

Family

ID=71024431

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010094634.3A Pending CN111288296A (en) 2020-02-13 2020-02-13 Control device and method of nitrogen replacement equipment

Country Status (1)

Country Link
CN (1) CN111288296A (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2403490Y (en) * 2000-01-28 2000-11-01 苏州市宏运净化设备有限公司 Underground explosion-proof nitrogen generator
US20100241371A1 (en) * 2007-10-26 2010-09-23 Fouad Ammouri Method for the real-time determination of the filling level of a cryogenic tank
CN103116370A (en) * 2013-01-04 2013-05-22 北京银谷科讯信息技术有限公司 Pressure regulating device
CN203836590U (en) * 2014-05-27 2014-09-17 中国石油天然气第六建设公司 Liquid nitrogen pressurizing gasification prizing device
CN206582517U (en) * 2017-03-10 2017-10-24 佛山市顺德区港华燃气有限公司 A kind of plunger pump BOG/EAG gas recovery systems
CN206847463U (en) * 2017-06-13 2018-01-05 深圳市爱能森科技有限公司 A kind of heat storage can control system
CN109779568A (en) * 2018-12-14 2019-05-21 中国石油天然气集团有限公司 The closed loop control method and system of automation control pressure implementation kill-job

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2403490Y (en) * 2000-01-28 2000-11-01 苏州市宏运净化设备有限公司 Underground explosion-proof nitrogen generator
US20100241371A1 (en) * 2007-10-26 2010-09-23 Fouad Ammouri Method for the real-time determination of the filling level of a cryogenic tank
CN103116370A (en) * 2013-01-04 2013-05-22 北京银谷科讯信息技术有限公司 Pressure regulating device
CN203836590U (en) * 2014-05-27 2014-09-17 中国石油天然气第六建设公司 Liquid nitrogen pressurizing gasification prizing device
CN206582517U (en) * 2017-03-10 2017-10-24 佛山市顺德区港华燃气有限公司 A kind of plunger pump BOG/EAG gas recovery systems
CN206847463U (en) * 2017-06-13 2018-01-05 深圳市爱能森科技有限公司 A kind of heat storage can control system
CN109779568A (en) * 2018-12-14 2019-05-21 中国石油天然气集团有限公司 The closed loop control method and system of automation control pressure implementation kill-job

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
夏晨: "《自动控制原理与系统第2版第1次》", 31 January 2017, 北京：北京理工大学出版社 *

Similar Documents

Publication Publication Date Title
US6953045B2 (en) Gas delivery system
US11384903B2 (en) Cryogenic fluid storage tank
CN113260809B (en) Cryogenic fluid storage tank and method of filling the same
US20110225986A1 (en) Systems and methods for gas supply and usage
CA2794646C (en) Apparatus for purging hydrogen cooling gas from a turbine and high flow co2 delivery system
CN211853513U (en) Nitrogen gas replacement device
JP7450798B2 (en) gaseous fuel supply system
CN111288296A (en) Control device and method of nitrogen replacement equipment
JP2016532289A (en) Remote delivery of chemical reagents
KR101856470B1 (en) Liquefied petroleum gas remote control and monitoring system
CN111207290A (en) Nitrogen gas replacement device
US11480301B2 (en) Cryogenic fluid storage tank
US1942944A (en) Method and apparatus for dispensing gas material
JP2014152869A (en) Liquefied gas supply device and method
CN113390005A (en) Storage tank supercharging device and working method thereof
CN206386686U (en) One kind, which automatically switches, carries out supply LNG, CNG system
CN111346286A (en) Automatic medical oxygen supply system
TWI825714B (en) and methods
US20060130896A1 (en) High reliability gas mixture back-up system
US20200119622A1 (en) Method for controlling the ambient temperature vaporization of carbon dioxide
CN110645474B (en) Colliery liquid carbon dioxide direct injection system and technology
CN217208903U (en) Liquid hydrogen tank car filling device and system
CN221279206U (en) Liquid nitrogen vaporization system
CN210398389U (en) Feeding system
JPS63199998A (en) Filling device for cryogenic liquefied gas conveying vessel

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
WD01 Invention patent application deemed withdrawn after publication
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20200616