阅读说明：本技术 一种天然气制热电子膨胀阀的控制方法及其系统 (Control method and system for natural gas heating electronic expansion valve ) 是由 李文峰 于 2021-09-25 设计创作，主要内容包括：本发明公开了一种天然气制热电子膨胀阀的控制方法及其系统,其属于电子膨胀阀的技术领域,其技术方案要点包括以下步骤：获取室外温度值并提前设定预设温度值；将室外温度值和预设温度值进行比较,判断室外温度值是否小于预设温度值；当室外温度值小于预设温度值时,控制电子膨胀阀打开,电子膨胀阀与压缩机变频调速相互配合。本申请具有通过对管道外部的温度进行检测,从而判断管道外温度是否过低,当温度较低时存在结霜的现象,打开电子膨胀阀,此时压缩机高速转动,制冷剂大流量循环,利用压缩机排气热量进行除霜,该除霜的方式时间较短,且能耗较低的效果。(The invention discloses a control method and a control system for an electronic expansion valve for heating natural gas, which belong to the technical field of electronic expansion valves, and the technical scheme is characterized by comprising the following steps: acquiring an outdoor temperature value and setting a preset temperature value in advance; comparing the outdoor temperature value with a preset temperature value, and judging whether the outdoor temperature value is smaller than the preset temperature value or not; and when the outdoor temperature value is less than the preset temperature value, controlling the electronic expansion valve to be opened, and mutually matching the electronic expansion valve with the compressor for frequency conversion and speed regulation. This application has through detecting the outside temperature of pipeline to judge whether the outside temperature of pipeline is crossed lowly, have the phenomenon of frosting when the temperature is lower, open electronic expansion valve, the high-speed rotation of compressor this moment, the large-traffic circulation of refrigerant utilizes compressor exhaust heat to defrost, and the mode time of this defrosting is shorter, and the lower effect of energy consumption.)

1. A control method for a natural gas heating electronic expansion valve is characterized by comprising the following steps:

acquiring an outdoor temperature value and setting a preset temperature value in advance;

comparing the outdoor temperature value with a preset temperature value, and judging whether the outdoor temperature value is smaller than the preset temperature value or not;

when the outdoor temperature value is smaller than the preset temperature value, the electronic expansion valve (3) is controlled to be opened, and the electronic expansion valve (3) is matched with the compressor (4) in a frequency conversion and speed regulation manner.

2. The control method of the electronic expansion valve for heating by natural gas according to claim 1, wherein when the outdoor temperature value is less than the preset temperature value, the electronic expansion valve (3) is controlled to be opened, and the frequency conversion and speed regulation of the electronic expansion valve (3) and the compressor (4) are matched with each other, further comprising:

acquiring an exhaust temperature value;

judging the exhaust temperature value;

when the exhaust temperature value is larger, the opening degree of the electronic expansion valve (3) is larger.

3. The control method of a natural gas heating electronic expansion valve according to claim 2, wherein the step of obtaining an exhaust gas temperature value further comprises:

acquiring the outlet temperature of the compressor (4) and the temperature of the condenser (5);

calculating the difference between the outlet temperature of the compressor (4) and the temperature of the condenser (5);

and taking the difference value between the outlet temperature of the compressor (4) and the temperature of the condenser (5) as an exhaust temperature value.

4. The control method of the electronic expansion valve for heating by natural gas according to claim 1, wherein when the outdoor temperature value is less than the preset temperature value, the electronic expansion valve (3) is controlled to be opened, and the frequency conversion and speed regulation of the electronic expansion valve (3) and the compressor (4) are matched with each other, further comprising: the opening state of the electronic expansion valve (3) is determined according to the working state of the compressor (4);

when the compressor (4) is stopped, the electronic expansion valve (3) is in a full-closed state, and coolant is prevented from flowing from the condenser (5) to the evaporator (6);

when the compressor (4) is started, the electronic expansion valve (3) is controlled to be opened firstly, and then the compressor (4) is controlled to be started.

5. The control method of the natural gas heating electronic expansion valve according to claim 4, wherein when the compressor (4) is started, the step of controlling the electronic expansion valve (3) to be opened first and then controlling the compressor (4) to be started specifically comprises the steps of:

acquiring the suction pressure of the evaporator (6) and the exhaust pressure of the evaporator (6);

the opening degree of the electronic expansion valve (3) is adjusted;

when the suction pressure and the discharge pressure reach the balance, the compressor (4) is controlled to start.

6. A control system of a natural gas heating electronic expansion valve (3) is characterized by comprising a central controller (1), a detection device (2), the electronic expansion valve (3), a compressor (4), a condenser (5) connected with an outlet of the compressor (4) and an evaporator (6) connected with an inlet of the compressor (4), wherein the central controller (1) comprises an information acquisition module (11), an analysis module (12) and a control module (13);

the information acquisition module (11): for obtaining an exhaust temperature value;

the analysis module (12): determining the opening degree of the electronic expansion valve (3) according to the exhaust temperature value and a preset temperature value;

the control module (13): and controlling the opening size of the electronic expansion valve (3) according to the opening value.

7. A control system for a natural gas heating electronic expansion valve (3), according to claim 6, characterized in that: the detection device (2) comprises a temperature sensor (21) and a pressure sensor (22);

the temperature sensor (21) is divided into a first temperature sensor (211) for detecting an outdoor temperature value, a second temperature sensor (212) for detecting an outlet temperature of the compressor (4), a third temperature sensor (213) for detecting a temperature of the condenser (5) and a fourth temperature sensor (214) for detecting an exhaust temperature value at an outlet of the evaporator (6);

the pressure sensor (22) is divided into a first pressure sensor (221) for detecting a suction pressure and a second pressure sensor (222) for detecting a discharge pressure.

8. The control system of the electronic expansion valve (3) for heating natural gas according to claim 7, wherein the analysis module (12) is configured to set a plurality of preset temperature values, each preset temperature value is divided into a temperature range, and the opening degree of the electronic expansion valve (3) is determined according to different temperature ranges.

9. An intelligent terminal comprising a memory and a processor, the memory having stored therein at least one instruction, at least one program, set of codes, or set of instructions, the at least one instruction, at least one program, set of codes, or set of instructions being loaded and executed by the processor to implement the method of controlling a natural gas heated electronic expansion valve according to any one of claims 1 to 4.

10. A computer readable storage medium having stored therein at least one instruction, at least one program, code set, or set of instructions, which is loaded and executed by a processor to implement a method of controlling a natural gas-heated electronic expansion valve according to any one of claims 1 to 4.

Technical Field

The invention relates to the field of electronic expansion valves, in particular to a control method and a control system for a natural gas heating electronic expansion valve.

Background

The natural gas pipeline refers to a pipeline for conveying natural gas from a mining place or a processing plant to a city gas distribution center or an industrial enterprise user, and is also called a gas transmission pipeline. The natural gas pipeline is used for conveying natural gas, and is a way for conveying a large amount of natural gas on land. The natural gas needs to absorb a large amount of heat by liquid gasification, severe phase change in the pipeline causes water vapor cooling and frosting outside the pipeline, the main pipeline frosting can block the valve to cause gas cut-off, and therefore common natural gas pipelines are equipped with electric heaters.

The existing electric heater of the natural gas pipeline comprises a shell, a heat insulation material, a heating chamber, a gas distributor, a natural gas inlet, a sewage outlet, a mixed flow chamber, an explosion-proof junction box, a primary protection switch, an overtemperature protection switch, a natural gas outlet and a temperature measuring resistor. The utility model discloses an electric heater, including electric heater, explosion-proof terminal box, one-level protection switch, overtemperature protection switch, natural gas export and temperature measurement resistance, the right-hand member is equipped with gas distributor and natural gas import, and the middle part is the heating chamber, and the middle part of electric heater is located to the drain.

The electric heater needs to consume a large amount of energy to heat in the using process, and the time for generating heat by the electric heater is long, so that the defrosting time is long.

Disclosure of Invention

In order to solve the problem that the existing natural gas system is low in heat exchange capacity and possibly causes resource waste, the application provides a control method and a control system for a natural gas heating electronic expansion valve.

In a first aspect, the present application provides a control method for a natural gas heating electronic expansion valve, which adopts the following technical scheme:

a control method of an electronic expansion valve for natural gas heating comprises the following steps:

acquiring an outdoor temperature value and setting a preset temperature value in advance;

comparing the outdoor temperature value with a preset temperature value, and judging whether the outdoor temperature value is smaller than the preset temperature value or not;

and when the outdoor temperature value is less than the preset temperature value, controlling the electronic expansion valve to be opened, and mutually matching the electronic expansion valve with the compressor for frequency conversion and speed regulation.

Through adopting above-mentioned technical scheme, through detecting the outside temperature of pipeline to judge whether the outside temperature of pipeline is too low, there is the phenomenon of frosting when the temperature is lower, open electronic expansion valve, the compressor high-speed rotation this moment, the large-traffic circulation of refrigerant utilizes the compressor exhaust heat to defrost, and this mode time of defrosting is shorter, and the energy consumption is lower.

Optionally, when the outdoor temperature value is less than the preset temperature value, the electronic expansion valve is controlled to be opened, and the electronic expansion valve and the compressor are matched with each other in frequency conversion and speed regulation, and the method further comprises the following steps:

acquiring an exhaust temperature value;

judging the exhaust temperature value;

when the exhaust temperature value is larger, the opening degree of the electronic expansion valve is larger.

Through adopting above-mentioned technical scheme, when the exhaust temperature value is great, increase electronic expansion valve's opening degree and can increase the refrigerant flow, the cooling is admitted air to reach the effect that reduces exhaust temperature, reduce exhaust temperature and can reduce the consumption of compressor, ensured simultaneously that the compressor can the safe operation.

Optionally, the step of obtaining the exhaust temperature value further includes:

acquiring the outlet temperature of a compressor and the temperature of a condenser;

calculating a difference between the compressor outlet temperature and the condenser temperature;

the difference between the compressor outlet temperature and the condenser temperature is taken as the discharge temperature value.

By adopting the technical scheme, the temperature at each position of the compressor can be detected more comprehensively by taking the difference value between the outlet temperature of the compressor and the temperature of the condenser as an exhaust temperature value, so that the opening size of the electronic expansion valve is adjusted, and the effects of saving energy consumption and quickly defrosting are achieved.

Optionally, when the outdoor temperature value is less than the preset temperature value, the electronic expansion valve is controlled to be opened, and the electronic expansion valve and the compressor are matched with each other in frequency conversion and speed regulation, and the method further comprises the following steps: the opening state of the electronic expansion valve is determined according to the working state of the compressor;

when the compressor is stopped, the electronic expansion valve is in a full-closed state, and the coolant is prevented from flowing from the condenser to the evaporator;

when the compressor is started, the electronic expansion valve is controlled to be opened firstly, and then the compressor is controlled to be started.

By adopting the technical scheme, the opening state of the electronic expansion valve is controlled according to the working state of the compressor, so that the heat loss is reduced, the energy consumption is reduced, and the compressor can be started more easily by controlling the starting of the compressor after the electronic expansion valve is opened.

Optionally, when the compressor is started, the first step of controlling the electronic expansion valve to open and the second step of controlling the compressor to start specifically includes:

acquiring suction pressure of an evaporator and exhaust pressure of the evaporator;

adjusting the opening degree of the electronic expansion valve;

when the suction pressure and the discharge pressure reach the balance, the compressor is controlled to start.

By adopting the technical scheme, the compressor is started after the electronic expansion valve is controlled to be opened, so that the heat loss is reduced, and the compressor is easier to start.

In a second aspect, the present application provides a control system for a natural gas heating electronic expansion valve, which adopts the following technical scheme:

a control system of an electronic expansion valve for heating natural gas comprises a central controller, a detection device, the electronic expansion valve, a compressor, a condenser connected with an outlet of the compressor and an evaporator connected with an inlet of the compressor, wherein the central controller comprises an information acquisition module, an analysis module and a control module;

the information acquisition module: for obtaining an exhaust temperature value;

an analysis module: determining the opening degree of the electronic expansion valve according to the exhaust temperature value and a preset temperature value;

a control module: and controlling the opening size of the electronic expansion valve according to the opening value.

Through adopting above-mentioned technical scheme, gather the superheat degree signal and carry out the analysis to the superheat degree signal, according to analysis result control electronic expansion valve's aperture size, control compressor according to the condition and start to carry out the defrosting to natural gas line department and handle, and produce heat through the compressor and defrost efficient higher, and the energy consumption is lower.

Optionally, the detection device includes a temperature sensor and a pressure sensor;

the temperature sensor is divided into a first temperature sensor for detecting outdoor temperature value, a second temperature sensor for detecting outlet temperature of the compressor, a third temperature sensor for detecting condenser temperature and a fourth temperature sensor for detecting exhaust temperature value at the outlet of the evaporator;

the pressure sensor is divided into a first pressure sensor for acquiring a suction pressure and a second pressure sensor for acquiring a discharge pressure.

Through adopting above-mentioned technical scheme, carry out temperature detection to the position of natural gas line department difference, detect the atmospheric pressure of the different departments of evaporimeter to give central controller with the testing result through wireless network transmission, central controller sends different control instruction according to different temperature or pressure, thereby reaches the effect of quick defrosting.

Optionally, the analysis module is configured to set a plurality of preset temperature values, each preset temperature value is divided into a temperature range, and the opening degree of the electronic expansion valve is determined according to different temperature ranges.

By adopting the technical scheme, when the detected temperature is in different temperature ranges, the electronic expansion valve is controlled to open corresponding opening degrees according to the temperature range in which the detected temperature is, so that the energy loss is reduced while defrosting is performed.

In a third aspect, the present application provides an intelligent terminal, which adopts the following technical scheme:

a smart terminal comprising a memory and a processor, the memory having stored therein at least one instruction, at least one program, a set of codes, or a set of instructions, the at least one instruction, at least one program, a set of codes, or a set of instructions being loaded and executed by the processor to implement a method of controlling a natural gas heated electronic expansion valve according to any one of the preceding claims.

By adopting the technical scheme, the corresponding program can be stored and processed, and the defrosting method has the advantages of being more efficient and energy-saving.

In a fourth aspect, the present application provides a computer-readable storage medium, which adopts the following technical solutions:

a computer readable storage medium having stored therein at least one instruction, at least one program, set of codes, or set of instructions, which is loaded and executed by a processor to implement a method of controlling a natural gas heated electronic expansion valve according to any one of claims 1 to 4.

By adopting the technical scheme, the related programs can be conveniently stored, and the natural gas pipeline can be quickly defrosted conveniently.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when the temperature is low, the frosting phenomenon exists, the electronic expansion valve is opened, the compressor rotates at a high speed at the moment, the refrigerant circulates in a large flow, the defrosting is carried out by utilizing the exhaust heat of the compressor, the defrosting mode has short time and low energy consumption.

2. The opening state of the electronic expansion valve is controlled according to the working state of the compressor, so that the heat loss is reduced, and the energy consumption is reduced.

Drawings

Fig. 1 is a block diagram of a control system of an electronic expansion valve for natural gas heating according to an embodiment of the present application.

Fig. 2 is a block diagram of a detection device in the embodiment of the present application.

Fig. 3 is a schematic diagram of connection between a detection device and a control system in an embodiment of the present application.

Fig. 4 is a schematic connection diagram of the central controller in the embodiment of the present application.

Fig. 5 is a flowchart of a control method of the natural gas heating electronic expansion valve according to the embodiment of the present application.

Fig. 6 is a flowchart of the opening degree setting of the electronic expansion valve in the embodiment of the present application.

Description of reference numerals:

1. a central controller; 11. an information acquisition module; 12. an analysis module; 13. a control module; 2. a detection device; 21. a temperature sensor; 211. a first temperature sensor; 212. a second temperature sensor; 213. a third temperature sensor; 214. a fourth temperature sensor; 22. a pressure sensor; 221. a first pressure sensor; 222. a second pressure sensor; 3. an electronic expansion valve; 4. a compressor; 5. a condenser; 6. an evaporator.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

Embodiments of a control method and a control system for an electronic expansion valve for heating natural gas according to the present application are described in further detail below with reference to the drawings of the specification.

An embodiment of the application discloses a control system of an electronic expansion valve for heating natural gas.

Referring to fig. 1, a control system for an electronic expansion valve for heating natural gas comprises an electronic expansion valve 3 and a compressor 4, wherein the electronic expansion valve 3 and the compressor 4 are matched with each other in a frequency conversion and speed regulation manner. The outlet of the compressor 4 is connected to a condenser 5, and the inlet of the compressor 4 is connected to an evaporator 6. The evaporator 6 absorbs heat of water to complete evaporation of the liquefied gas, the compressor 4 absorbs the liquefied gas in a vapor state and compresses the liquefied gas into high-temperature and high-pressure gas to the condenser 5, and the high-temperature and high-pressure liquefied gas in the condenser 5 releases heat to become liquid liquefied gas. In the present embodiment, the electronic expansion valve 3 is opened to circulate the refrigerant at a large flow rate, and the refrigerant is in contact with the high-temperature and high-pressure liquefied gas in a vapor state to generate a large amount of heat, which can perform a defrosting operation on the natural gas pipeline.

Referring to fig. 2 and 3, the control system for the natural gas-to-steam thermal electronic expansion valve further includes a detection device 2, the detection device 2 includes a temperature sensor 21 and a pressure sensor 22, the temperature sensor 21 is divided into a first temperature sensor 211, a second temperature sensor 212, a third temperature sensor 213, and a fourth temperature sensor 214, and the pressure sensor 22 is divided into a first pressure sensor 221 and a second pressure sensor 222. First temperature sensor 211 is located outside the natural gas line, and first temperature sensor 211 is used for detecting outdoor temperature value. The second temperature sensor 212 is provided at the outlet of the compressor 4, and the second temperature sensor 212 is used as the second temperature sensor 212 for detecting the outlet temperature of the compressor 4. The third temperature sensor 213 is provided in the condenser 5, and the third temperature sensor 213 detects the temperature of the condenser 5. A fourth temperature sensor 214 is provided at the outlet of the evaporator 6, the fourth temperature sensor 214 being adapted to detect a value of the temperature of the exhaust gas at the outlet of the evaporator 6. The first pressure sensor 221 is provided at the air intake of the evaporator 6, and the first pressure sensor 221 is configured to detect the air intake pressure at the air intake of the evaporator 6. The second pressure sensor 222 is provided at the exhaust port of the evaporator 6, and the second pressure sensor 222 is used to detect the exhaust pressure at the exhaust port of the evaporator 6.

Referring to fig. 4, the electronic expansion valve 3, the detection device 2, the compressor 4, the condenser 5, and the evaporator 6 are all communicatively connected to the central controller 1. Specifically, the central controller 1 includes an information acquisition module 11, an analysis module 12, and a control module 13. The information acquisition module 11 is used for acquiring an exhaust temperature value; the analysis module 12 is used for determining the opening degree of the electronic expansion valve 3 according to the exhaust temperature value and the preset temperature value; the control module 13 is used for controlling the opening size of the electronic expansion valve 3 according to the opening value. A plurality of preset temperature values are set in the analysis module 12, each preset temperature value is divided into a temperature range, and the opening degree of the electronic expansion valve 3 is determined according to the temperature range in which the exhaust temperature value is located.

In implementation, the information acquisition module 11 receives the electrical signal, the analysis module 12 analyzes the received electrical signal, and the control module 13 applies a voltage or a current to the expansion valve, so as to adjust the amount of the refrigerant liquid. The refrigerant heat at the outlet of the evaporator 6 is adjusted by the electronic expansion valve 3, the superheat signal is collected by the fourth temperature sensor 214 and the second pressure sensor 222 provided at the outlet of the evaporator 6, and the opening degree of the expansion valve is controlled by feedback adjustment.

The following describes in detail the implementation of a control method for the electronic expansion valve 3 with natural gas heating in conjunction with a control system for the electronic expansion valve with natural gas heating:

referring to fig. 5, a control method for an electronic expansion valve for heating natural gas includes the following steps:

s1, acquiring an outdoor temperature value and setting a preset temperature value in advance;

in implementation, when the outdoor temperature value is too low, the natural gas pipeline can generate a frosting phenomenon, and the frosting can cause the valve to be blocked, so that the gas is cut off, and defrosting treatment needs to be carried out in time.

S2, comparing the outdoor temperature value with a preset temperature value and judging whether the outdoor temperature value is smaller than the preset temperature value;

and S3, when the outdoor temperature value is less than the preset temperature value, controlling the electronic expansion valve 3 to open.

In implementation, the electronic expansion valve 3 is opened to enable the compressor 4 to rotate at a high speed, the refrigerant circulates at a large flow rate, and the defrosting is performed by utilizing the exhaust heat of the compressor 4, wherein the defrosting mode is short in time and low in energy consumption.

Referring to fig. 6, the opening degree of the electronic expansion valve 3 is determined according to the magnitude of the exhaust temperature value, and specifically includes the following steps:

s10, acquiring the exhaust temperature value of the compressor 4;

s20, judging the exhaust temperature value;

s30, the greater the exhaust temperature value, the greater the opening degree of the electronic expansion valve 3.

In implementation, the opening degree of the electronic expansion valve 3 is controlled according to different exhaust temperature values, so that the defrosting effect is achieved. When the exhaust temperature value is large, the opening degree of the electronic expansion valve 3 is increased to increase the flow of the refrigerant and cool the intake air, so that the effect of reducing the exhaust temperature is achieved, and safety accidents caused by overhigh temperature of the compressor 4 are avoided.

The exhaust temperature value changes with the outlet temperature of the compressor 4 and the temperature of the condenser 5, and the method specifically comprises the following steps:

acquiring the outlet temperature of the compressor 4 and the temperature of the condenser 5;

calculating the difference between the outlet temperature of the compressor 4 and the temperature of the condenser 5;

the difference between the compressor 4 outlet temperature and the condenser 5 temperature is taken as the discharge temperature value.

In one embodiment, in order to reduce heat loss during defrosting, the opening state of the electronic expansion valve 3 is controlled according to the operating state of the compressor 4, and when the compressor 4 is stopped, the electronic expansion valve 3 is in a fully closed state, preventing the coolant from flowing from the condenser 5 to the evaporator 6; when the compressor 4 is started, the electronic expansion valve 3 is controlled to be opened, and then the compressor 4 is controlled to be started. This both reduces heat losses and makes the compressor 4 easier to start.

In another embodiment, in order to reduce heat loss, the suction pressure of the evaporator 6 and the discharge pressure of the evaporator 6 are detected, and the start of the compressor 4 is controlled by adjusting the opening degree of the electronic expansion valve 3 so that the suction pressure and the discharge pressure are balanced.

The embodiment of the application also discloses an intelligent terminal which comprises a memory and a processor, wherein the memory is stored with a computer program which can be loaded by the processor and can execute the control method of the natural gas heating electronic expansion valve.

Based on the same inventive concept, an embodiment of the present application further discloses a computer-readable storage medium, where at least one instruction, at least one program, a code set, or a set of instructions is stored in the storage medium, and the at least one instruction, the at least one program, the code set, or the set of instructions can be loaded and executed by a processor to implement the control method for controlling the natural gas hot electron expansion valve provided by the above method embodiment.

It should be understood that reference to "a plurality" herein means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

Those skilled in the art will appreciate that all or part of the steps of implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing associated hardware, where the program may be stored in a computer-readable storage medium, where the above-mentioned storage medium includes, for example: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.