CN116407863A - Control method of coiled pipe type oil-gas condenser - Google Patents

Control method of coiled pipe type oil-gas condenser Download PDF

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Publication number
CN116407863A
CN116407863A CN202310345052.1A CN202310345052A CN116407863A CN 116407863 A CN116407863 A CN 116407863A CN 202310345052 A CN202310345052 A CN 202310345052A CN 116407863 A CN116407863 A CN 116407863A
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switch valve
real
heat exchange
oil
time
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CN202310345052.1A
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Chinese (zh)
Inventor
林创辉
张学伟
崔梓华
原志峰
张超颖
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Guangdong Shenling Environmental Systems Co Ltd
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Guangdong Shenling Environmental Systems Co Ltd
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Priority to CN202310345052.1A priority Critical patent/CN116407863A/en
Publication of CN116407863A publication Critical patent/CN116407863A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
    • B01D5/0003—Condensation of vapours; Recovering volatile solvents by condensation by using heat-exchange surfaces for indirect contact between gases or vapours and the cooling medium
    • B01D5/0006—Coils or serpentines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
    • B01D5/0033—Other features
    • B01D5/0051—Regulation processes; Control systems, e.g. valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
    • B01D5/0078—Condensation of vapours; Recovering volatile solvents by condensation characterised by auxiliary systems or arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28B—STEAM OR VAPOUR CONDENSERS
    • F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
    • F28B1/02—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser using water or other liquid as the cooling medium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28B—STEAM OR VAPOUR CONDENSERS
    • F28B11/00—Controlling arrangements with features specially adapted for condensers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28B—STEAM OR VAPOUR CONDENSERS
    • F28B9/00—Auxiliary systems, arrangements, or devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

The invention discloses a control method of a coiled pipe type oil-gas condenser, which comprises the following steps: the first switch valve and the third switch valve are controlled to be opened, and the second switch valve and the fourth switch valve are controlled to be closed; acquiring real-time pressure values fed back by the second pressure sensor and the third pressure sensor and calculating a real-time pressure difference value between the two pressure values; comparing the real-time differential pressure value with a preset differential pressure set value P0, and judging whether to execute a defrosting mode according to the comparison result; when the defrosting mode is executed, acquiring a real-time temperature value fed back by the second temperature sensor, and setting the real-time temperature value as T2; comparing the real-time temperature value T2 with a set temperature value T02, and returning to a line condensation mode when a return condition is met; according to the control method disclosed by the application, the defrosting mode can be executed according to the comparison result of the real-time pressure difference value and the preset pressure difference value, timely defrosting and clean defrosting are realized, the problem that the coil type oil-gas condenser cannot normally operate due to excessive frost is avoided, and the stability and reliability of the coil type oil-gas condenser in operation are improved.

Description

Control method of coiled pipe type oil-gas condenser
Technical Field
The invention relates to the technical field of oil gas condensation and liquefaction, in particular to a control method of a coiled pipe type oil gas condenser.
Background
The oil gas condenser is used for condensing and liquefying volatile organic compounds in oil gas such as VOCs gas; because the condensation temperature of most VOCs gas is substantially lower than 0 ℃, and the VOCs gas contains moisture, the moisture in oil gas adheres to the surface of the heat exchanger, when the existing oil gas condenser executes a condensation mode, namely when oil gas condensation liquefaction is carried out, the problem of frosting is very easy to occur, the problem that normal operation cannot be carried out easily occurs to the oil gas condenser after frosting, and when the frost on the surface of the heat exchanger is excessive, the heat exchanger can be expanded to cause damage of the oil gas condenser and cannot continue to work.
It can be seen that there is a need for improvements and improvements in the art.
Disclosure of Invention
In view of the shortcomings of the prior art, the invention aims to provide a control method of a coiled oil-gas condenser, which can realize timely defrosting and clean defrosting, and can automatically return to a condensing mode when defrosting is completed, and has the advantages of high working intelligence and high stability.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the control method of the coiled pipe type oil-gas condenser comprises a shell, a control device, a first switch valve, a second switch valve, a third switch valve, a fourth switch valve, a second pressure sensor, a third pressure sensor and a second temperature sensor, wherein the first switch valve, the second switch valve, the third switch valve, the fourth switch valve, the second pressure sensor, the third pressure sensor and the second temperature sensor are respectively and electrically connected with the control device, one side of the shell is provided with a liquid inlet interface and a gas outlet interface, and the top of the shell is respectively provided with an oil-gas inlet and an oil-gas outlet; one end of the first switch valve is used for being connected with a liquid pipe after a refrigerating system filter, one end of the second switch valve is used for being connected with a liquid pipe after a refrigerating system condenser, and the other end of the first switch valve and the other end of the second switch valve are respectively connected with the liquid inlet interface; one end of the third switch valve and one end of the fourth switch valve are respectively connected with the air outlet interface, the other end of the third switch valve is used for being connected with an air suction pipe of the compressor, and the other end of the fourth switch valve is used for being connected with an air discharge pipe of the compressor; the second pressure sensor is arranged at the oil gas inlet, the third pressure sensor is arranged at the oil gas outlet, and the second temperature sensor is arranged on a connecting pipeline of the first switch valve and the liquid inlet interface; the control method comprises the following steps:
the first switch valve and the third switch valve are controlled to be opened, and the second switch valve and the fourth switch valve are controlled to be closed; executing a condensing mode by the coiled oil gas condenser;
acquiring real-time pressure values fed back by the second pressure sensor and the third pressure sensor, respectively setting the real-time pressure values as P2 and P3, and calculating real-time pressure difference values according to the P2 and the P3;
comparing the real-time differential pressure value with a preset differential pressure set value P0, and judging whether to execute a defrosting mode according to the comparison result;
when the defrosting mode is executed, acquiring a real-time temperature value fed back by the second temperature sensor, setting the real-time temperature value as T2, and comparing the real-time temperature value T2 with a set temperature value T02;
when T2 is less than or equal to T02, the first switch valve, the second switch valve, the third switch valve and the fourth switch valve are controlled to keep the working state unchanged;
when T2 is more than T02, the first switch valve and the third switch valve are controlled to be opened, the second switch valve and the fourth switch valve are controlled to be closed, and the coiled oil gas condenser returns to a condensing mode.
In the control method of the coiled oil-gas condenser, the comparison of the real-time differential pressure value and the preset differential pressure set value P0 judges whether to execute the defrosting mode according to the comparison result, and specifically comprises the following steps:
when P2-P3 is less than or equal to P0, the first switch valve, the second switch valve, the third switch valve and the fourth switch valve are controlled to keep the working state unchanged;
when P2-P3 is more than P0, the first switch valve and the third switch valve are controlled to be closed, the second switch valve and the fourth switch valve are controlled to be opened, and the coiled oil gas condenser executes a defrosting mode.
In the control method of the coiled pipe type oil-gas condenser, the coiled pipe type oil-gas condenser further comprises a first pressure sensor, a first temperature sensor and an expansion valve which are respectively and electrically connected with the control device; the expansion valve is arranged on a connecting pipeline of the first switch valve and the liquid inlet port; the first pressure sensor and the first temperature sensor are respectively arranged on a connecting pipeline of the third switch valve and the air outlet interface; after the first switch valve and the third switch valve are controlled to be opened and the second switch valve and the fourth switch valve are controlled to be closed, the method further comprises the steps of:
controlling the expansion valve to be opened;
acquiring a real-time pressure value fed back by a first pressure sensor, and acquiring a saturation temperature TP corresponding to the real-time pressure value;
acquiring a real-time temperature value fed back by a first temperature sensor, setting the real-time temperature value as T1, and calculating a difference value between a real-time saturation temperature TP and the real-time temperature value T1;
acquiring a preset temperature value T01 and a set control precision delta T;
and adjusting the working state of the expansion valve according to the comparison result between the difference value between the real-time saturation temperature TP and the real-time temperature value T1, the set temperature value T01 and the set control precision delta T.
In the control method of the coiled oil-gas condenser, the adjusting the working state of the expansion valve according to the difference between the real-time saturation temperature TP and the real-time temperature value T1 and the comparison result between the set temperature value T01 and the set control precision DeltaT specifically comprises the following steps:
when T01-delta T is less than or equal to TP-T1 and less than or equal to T01+delta T, the expansion valve is controlled to keep the working state unchanged;
when TP-T1 is more than T01+DeltaT, the opening degree of the expansion valve is controlled to be increased;
when TP-T1 is smaller than T01-DeltaT, the opening degree of the expansion valve is controlled to be reduced.
In the control method of the coiled oil-gas condenser, a heat exchange coil is arranged in the shell, a liquid inlet end of the heat exchange coil is connected with the liquid inlet interface, and an air outlet end of the heat exchange coil is connected with the air outlet interface; a plurality of baffle plates which are distributed at intervals are further arranged in the shell, and the adjacent baffle plates are arranged up and down.
In the control method of the coiled oil-gas condenser, the heat exchange coil comprises a plurality of heat exchange tube groups which are arranged side by side, each heat exchange tube group comprises a plurality of heat exchange tubes and a plurality of heat exchange tube bends, the heat exchange tubes are arranged at intervals up and down, and the heat exchange tubes adjacent up and down are connected through the heat exchange tube bends; the heat exchange tube at the lowest part of the heat exchange tube group is connected with the liquid inlet interface, and the heat exchange tube at the highest part of the heat exchange tube group is connected with the air outlet interface.
In the control method of the coiled oil-gas condenser, a liquid separator, a gas collecting tube and a plurality of liquid separating tubes are arranged in the shell; the liquid inlet ports are respectively connected with one ends of a plurality of liquid separation pipes through the liquid separators, and the other ends of the liquid separation pipes are respectively connected with a plurality of heat exchange pipe groups in a one-to-one correspondence manner; the uppermost heat exchange tubes of the heat exchange tube groups are respectively connected with one end of the gas collecting tube, and the other end of the gas collecting tube is connected with the gas outlet interface.
In the control method of the coiled pipe type oil-gas condenser, the shell comprises a first end cover, a second end cover, a first tube plate, a second tube plate and a pipe body, wherein the first end cover is connected with one end of the pipe body through the first tube plate, and the second end cover is connected with the other end of the pipe body through the second tube plate; the liquid inlet port and the air outlet port are respectively arranged on the first end cover, and the oil gas inlet and the oil gas outlet are respectively arranged on the top of the pipe body; the heat exchange tubes are arranged between the first tube plate and the second tube plate, and the heat exchange tube bends are arranged in a first cavity formed between the first tube plate and the first end cover or in a second cavity formed between the second tube plate and the second end cover.
In the control method of the coiled pipe type oil-gas condenser, two ends of the baffle plate are respectively provided with a baffle plate, and the outer surface of the heat exchange pipe is provided with a surface coating.
In the control method of the coiled pipe type oil-gas condenser, an oil-gas condensed liquid outlet and an installation seat are further arranged at the bottom of the shell.
The beneficial effects are that:
the invention provides a control method of a coiled pipe type oil-gas condenser, which can execute a defrosting mode according to the comparison result of a real-time differential pressure value and a preset differential pressure value, realize timely defrosting and clean defrosting, avoid the phenomenon that the coiled pipe type oil-gas condenser cannot normally operate due to the frosting problem, and improve the stability and reliability of the coiled pipe type oil-gas condenser during operation; in addition, when the defrosting mode is executed, the condensing mode can be returned according to the comparison result of the real-time temperature value T2 and the preset temperature value T20, the intelligent degree of the coil type oil gas condenser in operation is improved, the continuity of the coil type oil gas condenser in operation is ensured, and therefore the use experience of a user is improved.
Drawings
FIG. 1 is a first logic flow diagram of a control method provided by the present invention;
FIG. 2 is a logic flow diagram of one embodiment of step S300 provided by the present invention;
FIG. 3 is a second logic flow diagram of a control method provided by the present invention;
FIG. 4 is a logic flow diagram of one embodiment of step S650 provided by the present invention;
FIG. 5 is an elevation view of the internal structure of the coiled oil and gas condenser provided by the present invention;
FIG. 6 is a top view of the internal structure of the coiled oil and gas condenser provided by the invention;
FIG. 7 is a bottom view of the internal structure of a coiled oil and gas condenser according to the present invention;
FIG. 8 is a system configuration diagram of a coiled oil and gas condenser provided by the present invention.
Description of main reference numerals: 1-shell, 11-first end cover, 12-second end cover, 13-first tube plate, 14-second tube plate, 15-tube body, 16-mount, 21-liquid inlet interface, 22-air outlet interface, 23-oil gas inlet, 24-oil gas outlet, 25-oil gas condensed liquid outlet, 31-heat exchange coil, 32-knockout, 33-knockout tube, 34-gas collecting tube, 35-baffle plate, 36-baffle plate, 4-control device, 51-first switch valve, 52-second switch valve, 53-third switch valve, 54-fourth switch valve, 55-expansion valve, 61-first temperature sensor, 62-second temperature sensor, 63-first pressure sensor, 64-second pressure sensor, 65-third pressure sensor.
Detailed Description
The invention provides a control method of a coiled pipe type oil-gas condenser, which is used for making the purpose, the technical scheme and the effect of the invention clearer and more definite, and the invention is further described in detail below by referring to the accompanying drawings and the embodiment.
In the description of the present invention, it should be understood that the azimuth or positional relationship indicated by the terms "top", "bottom", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description of the present invention and for simplification of description, and are not to be construed as limiting the present invention; furthermore, the terms "mounted," "connected," and the like, are to be construed broadly and, as appropriate, the specific meaning of the terms in the present invention will be understood by those of ordinary skill in the art.
Referring to fig. 1 to 8, the present invention provides a control method of a coiled oil-gas condenser, where the coiled oil-gas condenser includes a casing 1, a control device 4, and a first switch valve 51, a second switch valve 52, a third switch valve 53, a fourth switch valve 54, a second pressure sensor 64, a third pressure sensor 65, and a second temperature sensor 62 which are electrically connected with the control device 4, where one side of the casing 1 is provided with a liquid inlet interface 21 and an air outlet interface 22, and the top of the casing 1 is provided with an oil-gas inlet 23 and an oil-gas outlet 24; one end of the first switch valve 51 is used for connecting a liquid pipe after a refrigerating system filter, one end of the second switch valve 52 is used for connecting a liquid pipe after a refrigerating system condenser, and the other end of the first switch valve 51 and the other end of the second switch valve 52 are respectively connected with the liquid inlet port 21; one end of the third switch valve 53 and one end of the fourth switch valve 54 are respectively connected with the air outlet port 22, the other end of the third switch valve 53 is used for being connected with an air suction pipe of the compressor, and the other end of the fourth switch valve 54 is used for being connected with an air discharge pipe of the compressor; the second pressure sensor 64 is disposed at the oil gas inlet 23, the third pressure sensor 65 is disposed at the oil gas outlet 24, and the second temperature sensor 62 is disposed on a connection pipe between the first switch valve 51 and the liquid inlet 21; the control method comprises the following steps:
s100, controlling the first switch valve 51 and the third switch valve 53 to be opened, and controlling the second switch valve 52 and the fourth switch valve 54 to be closed; executing a condensing mode by the coiled oil gas condenser;
s200, acquiring real-time pressure values fed back by the second pressure sensor 64 and the third pressure sensor 65, respectively setting the real-time pressure values as P2 and P3, and calculating real-time pressure difference values according to the P2 and the P3;
s300, comparing the real-time differential pressure value with a preset differential pressure set value P0, and judging whether to execute a defrosting mode according to the comparison result;
s400, when the defrosting mode is executed, acquiring a real-time temperature value fed back by the second temperature sensor 62, setting the real-time temperature value as T2, and comparing the real-time temperature value T2 with a set temperature value T02;
s510, when T2 is less than or equal to T02, controlling the first switch valve 51, the second switch valve 52, the third switch valve 53 and the fourth switch valve 54 to keep the working state unchanged;
s520, when T2 is more than T02, the first switch valve 51 and the third switch valve 53 are controlled to be opened, the second switch valve 52 and the fourth switch valve 54 are controlled to be closed, and the coiled oil-gas condenser is controlled to return to a condensing mode.
According to the control method of the coiled pipe type oil-gas condenser, a defrosting mode can be executed according to the comparison result of the real-time pressure difference value and the preset pressure difference value, timely defrosting and clean defrosting are achieved, the phenomenon that the coiled pipe type oil-gas condenser cannot normally operate due to the frosting problem is avoided, and the stability and reliability of the coiled pipe type oil-gas condenser in operation are improved; in addition, when the defrosting mode is executed, the condensing mode can be returned according to the comparison result of the real-time temperature value T2 and the preset temperature value T20, the intelligent degree of the coil type oil gas condenser in operation is improved, the continuity of the coil type oil gas condenser in operation is ensured, and therefore the use experience of a user is improved.
When the coiled pipe type oil-gas condenser executes a defrosting mode, hot gas bypasses to defrost, the temperature of the refrigerant at the outlet of the liquid inlet interface 21 is low initially because of more frost, and the temperature of the refrigerant at the outlet of the liquid inlet interface 21 gradually rises along with the increase of defrosting time, when T2 is more than T02, the defrosting of the coiled pipe type oil-gas condenser is stopped, and the coiled pipe type oil-gas condenser can be restored to a condensing mode again to condense and liquefy oil gas again; when the coiled pipe type oil-gas condenser executes a condensation mode, low-temperature refrigeration liquid is input into the heat exchange coil 31 from the liquid inlet port 21, naturally flows along the heat exchange pipe and the elbow of the heat exchange coil 31, and the refrigerant after heat exchange and temperature rise is discharged out of the coiled pipe type oil-gas condenser through the air outlet port 22; the oil gas to be condensed and liquefied enters the coiled oil gas condenser through the oil gas inlet 23, exchanges heat with the refrigerant in the heat exchange coil 31, rectifies the oil gas fluid through the baffle plate 35, and the part of the oil gas after heat exchange is discharged through the oil gas outlet 24, and the part of condensed liquid is discharged through the oil gas condensed liquid outlet 25.
Further, referring to fig. 2 and 5, the comparing the real-time differential pressure value with the preset differential pressure set value P0, and judging whether to execute the defrosting mode according to the comparison result specifically includes:
s310, when P2-P3 is less than or equal to P0, the first switch valve 51, the second switch valve 52, the third switch valve 53 and the fourth switch valve 54 are controlled to keep the working state unchanged;
s320, when P2-P3 > P0, the first switch valve 51 and the third switch valve 53 are controlled to be closed, the second switch valve 52 and the fourth switch valve 54 are controlled to be opened, and the coiled oil-gas condenser executes a defrosting mode.
In the actual working process of the coiled pipe type oil-gas condenser, if the frosting problem occurs in the coiled pipe type oil-gas condenser, the frost can block ventilation gaps, the circulation resistance of oil gas is gradually increased, when the pressure difference value between the real-time pressure values fed back by the second pressure sensor 64 and the third pressure sensor 65 exceeds a preset pressure difference value, the frost is fully accumulated on the surface of the fin 31, and hot gas bypass defrosting is needed at the moment; when bypass defrosting is performed, the first switch valve 51 and the third switch valve 53 are closed, the second switch valve 52 and the fourth switch valve 54 are opened, high-temperature gas output by the compressor exhaust pipe enters the shell 1 through the fourth switch valve 54 and the air outlet interface 22, the gas after heat exchange is condensed into liquid, and the liquid is output to a liquid pipe behind a condenser of the refrigeration system through the liquid inlet interface 21 and the second switch valve 52.
Further, referring to fig. 3 and 5, the coiled oil-gas condenser further includes a first pressure sensor 63, a first temperature sensor 61 and an expansion valve 55 electrically connected to the control device 4, respectively; the expansion valve 55 is arranged on a connecting pipeline between the first switch valve 51 and the liquid inlet port 21; the first pressure sensor 63 and the first temperature sensor 61 are respectively disposed on the connection lines between the third switch valve 53 and the air outlet port 22; after the first switching valve 51 and the third switching valve 53 are controlled to be opened and the second switching valve 52 and the fourth switching valve 54 are controlled to be closed, the method further comprises the steps of:
s610, controlling the expansion valve 55 to be opened;
s620, acquiring a real-time pressure value fed back by the first pressure sensor 63, and acquiring a saturation temperature TP corresponding to the real-time pressure value;
s630, acquiring a real-time temperature value fed back by the first temperature sensor 61, setting the real-time temperature value as T1, and calculating a difference value between the real-time saturation temperature TP and the real-time temperature value T1;
s640, acquiring a preset temperature value T01 and a set control precision delta T;
s650, adjusting the working state of the expansion valve 55 according to the comparison result between the difference between the real-time saturation temperature TP and the real-time temperature value T1, the set temperature value T01 and the set control precision Δt.
According to the control method of the coiled pipe type oil-gas condenser, the working state of the expansion valve 55 can be adjusted according to the difference value between the real-time saturation temperature TP and the real-time temperature value T1 and the comparison result between the set temperature value T01 and the set control precision delta T, so that the sufficiency of refrigerant in the coiled pipe type oil-gas condenser is ensured, the condensing and liquefying effects on oil gas are ensured, and the stability and reliability of the coiled pipe type oil-gas condenser in working are improved.
Further, referring to fig. 4 and 5, the adjusting the working state of the expansion valve 55 according to the difference between the real-time saturation temperature TP and the real-time temperature T1, the set temperature T01, and the set control precision Δt specifically includes:
s651, when T01-DeltaT is less than or equal to TP-T1 is less than or equal to T01+DeltaT, the expansion valve 55 is controlled to keep the working state unchanged;
s652, when TP-T1 is more than T01+DeltaT, the opening degree of the expansion valve 55 is controlled to be increased;
s653, when TP-T1 is smaller than T01-DeltaT, the opening degree of the expansion valve 55 is controlled to be reduced.
When the coiled oil-gas condenser executes the defrosting mode, if TP-T1 is larger than T01+delta T, the fact that the flow of the refrigerant in the coiled oil-gas condenser is insufficient is indicated, the superheat degree of the gas outlet interface 22 of the oil-gas condenser is high, and the expansion valve 55 needs to be opened to increase the flow of the refrigerant; when TP-T1 is smaller than T01-DeltaT, the refrigerant flow in the coiled oil-gas condenser is overlarge, the superheat degree at the air outlet interface 22 of the oil-gas condenser is lower, and the expansion valve 55 needs to be closed to reduce the flow of the refrigerant; if the superheat degree is too low and the flow rate is too high, part of liquid refrigerant cannot be evaporated into gas, and the liquid refrigerant directly enters a compression cavity of the compressor, and at the moment, the compressor is damaged because the liquid is incompressible; if the superheat degree is too high and the flow rate is smaller, all liquid refrigerants are evaporated into gas, the suction temperature of the compressor is higher, and the gas cannot damage the compressor, but the too high suction temperature can lead to insufficient cooling of the compressor, so that the exhaust temperature of the compressor is too high, and the compressor is damaged due to the too high exhaust temperature.
Further, referring to fig. 5 to 7, a heat exchange coil 31 is disposed in the housing 1, a liquid inlet end of the heat exchange coil 31 is connected to the liquid inlet port 21, and an air outlet end of the heat exchange coil 31 is connected to the air outlet port 22; a plurality of baffle plates 35 which are distributed at intervals are also arranged in the shell 1, and the adjacent baffle plates 35 are arranged up and down; specifically, when any baffle 35 is fixedly connected with the top inner wall of the casing 1, the baffle 35 adjacent to the baffle 35 is fixedly connected with the bottom inner wall of the casing 1; in this embodiment, the baffle 35 is fixedly connected to the housing 1, and the liquid inlet 21, the air outlet 22, the oil gas inlet 23, and the oil gas outlet 24 are integrally formed with the housing 1 respectively.
In the embodiment, the baffle plate 35 is arranged outside the heat exchange coil 31, so that the orderly and orderly rectification can be carried out on the oil-gas fluid, the heat exchange fluid orderly flows towards the ground, the stable heat exchange temperature difference is realized, and the heat exchange efficiency of the coiled oil-gas condenser is greatly improved; in addition, the refrigerant naturally flows in the heat exchange coil 31, and the process of baffling and redistributing the refrigerant is not needed, so that the problems of uneven refrigerant distribution and unsmooth oil return are solved, and the oil return reliability and heat exchange uniformity of the coiled oil-gas condenser are improved.
Further, referring to fig. 5 to 7, the heat exchange coil 31 includes a plurality of heat exchange tube groups disposed side by side, the heat exchange tube groups include a plurality of heat exchange tubes and a plurality of heat exchange tube bends, the plurality of heat exchange tubes are disposed at intervals up and down, and the heat exchange tubes adjacent up and down are connected through the heat exchange tube bends; the lowest heat exchange tube of the heat exchange tube group is connected with the liquid inlet port 21, and the uppermost heat exchange tube of the heat exchange tube group is connected with the air outlet port 22.
In this embodiment, the refrigerant enters the heat exchange tube group, after the heat exchange tube at the lowest heat exchange tube performs the first-pass heat exchange, the refrigerant directly enters the second-pass heat exchange tube through the heat exchange tube elbow, that is, enters the heat exchange tube above the lowest heat exchange tube, without being baffled, that is, without the process of refrigerant redistribution, the problem of uneven distribution caused by refrigerant redistribution at the multi-pass baffling position is avoided, meanwhile, the problem of unsmooth oil return caused by insufficient flow rate at the multi-pass baffling position is avoided, and the oil return reliability and heat exchange uniformity of the coiled oil-gas condenser are improved.
Further, referring to fig. 5 to 7, the casing 1 is further provided therein with a liquid separator 32, a gas collecting tube 34 and a plurality of liquid separating tubes 33; the liquid inlet port 21 is respectively connected with one ends of a plurality of liquid separating pipes 33 through the liquid separator 32, and the other ends of the liquid separating pipes 33 are respectively connected with a plurality of heat exchange pipe groups in a one-to-one correspondence manner; the uppermost heat exchange tubes of the plurality of heat exchange tube groups are respectively connected with one end of the gas collecting tube 34, and the other end of the gas collecting tube 34 is connected with the gas outlet interface 22.
In this embodiment, the liquid separator 32 is matched with the liquid separating tube 33 to uniformly distribute the refrigerant into the heat exchange tubes of each heat exchange tube group, so that the distribution uniformity of the refrigerant is greatly improved, each heat exchange tube group is fully utilized, and the heat exchange efficiency of the coiled oil-gas condenser is greatly improved.
Further, referring to fig. 5 to 7, the housing 1 includes a first end cover 11, a second end cover 12, a first tube plate 13, a second tube plate 14, and a tube body 15, where the first end cover 11 is connected to one end of the tube body 15 through the first tube plate 13, and the second end cover 12 is connected to the other end of the tube body 15 through the second tube plate 14; the liquid inlet port 21 and the air outlet port 22 are respectively arranged on the first end cover 11, and the oil gas inlet port 23 and the oil gas outlet port 24 are respectively arranged on the top of the pipe body 15; the heat exchange tubes are arranged between the first tube plate 13 and the second tube plate 14, and the heat exchange tube bends are arranged in a first cavity formed between the first tube plate 13 and the first end cover 11 or in a second cavity formed between the second tube plate 14 and the second end cover 12; in this embodiment, the first tube plate 13 is welded to the first end cover 11 and the tube body 15, respectively; the second tube plate 14 is welded with the second end cover 12 and the tube body 15 respectively; the heat exchange tubes are respectively connected with the inside of the first tube plate 13 and the inside of the second tube plate 14.
Further, referring to fig. 5 to 7, two ends of the baffle 35 are respectively provided with a baffle 36 for limiting the installation position of the baffle 35, and the baffle can perform a heat conduction function, further increase the heat exchange area of the coiled oil-gas condenser, and improve the heat exchange performance of the coiled oil-gas condenser; in this embodiment, the baffle plates 36 are welded to both ends of the baffle plate 35, respectively;
further, the outer surface of the heat exchange tube is provided with a surface coating; in this embodiment, the surface coating is a hydrophobic coating, and the surface coating is provided to ensure that water vapor in the oil gas flows away quickly, so as to reduce the possibility that water vapor adheres to the surface of the heat exchange coil 31, thereby reducing the frosting speed of the heat exchange coil 31 and improving the stability of the heat exchange coil 31 during operation.
Further, in other embodiments, the surface of the heat exchange tube is provided with a plurality of fins, and by arranging the fins, the heat exchange area of the outer surface of the heat exchange tube can be expanded, and compared with the existing light tube, the heat exchange area of the heat exchange tube after the fins are arranged is increased by 2-3 times, so that the condensing and liquefying effects of the coiled oil gas condenser on oil gas are effectively improved.
Further, referring to fig. 5 to 7, the bottom of the housing 1 is further provided with an oil-gas condensed liquid outlet 25 and a mounting seat 16; in this embodiment, the oil-gas condensed liquid outlet 25 is integrally formed with the housing 1, and the mounting base 16 is welded with the housing 1.
It will be understood that equivalents and modifications will occur to those skilled in the art based on the present invention and its spirit, and all such modifications and substitutions are intended to be included within the scope of the present invention.

Claims (10)

1. The control method of the coiled pipe type oil-gas condenser is characterized in that the coiled pipe type oil-gas condenser comprises a shell, a control device, a first switch valve, a second switch valve, a third switch valve, a fourth switch valve, a second pressure sensor, a third pressure sensor and a second temperature sensor, wherein the first switch valve, the second switch valve, the third switch valve, the fourth switch valve, the second pressure sensor, the third pressure sensor and the second temperature sensor are respectively electrically connected with the control device, one side of the shell is provided with a liquid inlet interface and an air outlet interface, and the top of the shell is respectively provided with an oil-gas inlet and an oil-gas outlet; one end of the first switch valve is used for being connected with a liquid pipe after a refrigerating system filter, one end of the second switch valve is used for being connected with a liquid pipe after a refrigerating system condenser, and the other end of the first switch valve and the other end of the second switch valve are respectively connected with the liquid inlet interface; one end of the third switch valve and one end of the fourth switch valve are respectively connected with the air outlet interface, the other end of the third switch valve is used for being connected with an air suction pipe of the compressor, and the other end of the fourth switch valve is used for being connected with an air discharge pipe of the compressor; the second pressure sensor is arranged at the oil gas inlet, the third pressure sensor is arranged at the oil gas outlet, and the second temperature sensor is arranged on a connecting pipeline of the first switch valve and the liquid inlet interface; the control method comprises the following steps:
the first switch valve and the third switch valve are controlled to be opened, and the second switch valve and the fourth switch valve are controlled to be closed; executing a condensing mode by the coiled oil gas condenser;
acquiring real-time pressure values fed back by the second pressure sensor and the third pressure sensor, respectively setting the real-time pressure values as P2 and P3, and calculating real-time pressure difference values according to the P2 and the P3;
comparing the real-time differential pressure value with a preset differential pressure set value P0, and judging whether to execute a defrosting mode according to the comparison result;
when the defrosting mode is executed, acquiring a real-time temperature value fed back by the second temperature sensor, setting the real-time temperature value as T2, and comparing the real-time temperature value T2 with a set temperature value T02;
when T2 is less than or equal to T02, the first switch valve, the second switch valve, the third switch valve and the fourth switch valve are controlled to keep the working state unchanged;
when T2 is more than T02, the first switch valve and the third switch valve are controlled to be opened, the second switch valve and the fourth switch valve are controlled to be closed, and the coiled oil gas condenser returns to a condensing mode.
2. The control method of a coiled tubing oil-gas condenser according to claim 1, wherein comparing the real-time differential pressure value with a preset differential pressure set value P0, and judging whether to execute the defrosting mode according to the comparison result, specifically comprises:
when P2-P3 is less than or equal to P0, the first switch valve, the second switch valve, the third switch valve and the fourth switch valve are controlled to keep the working state unchanged;
when P2-P3 is more than P0, the first switch valve and the third switch valve are controlled to be closed, the second switch valve and the fourth switch valve are controlled to be opened, and the coiled oil gas condenser executes a defrosting mode.
3. The method of claim 1, further comprising a first pressure sensor, a first temperature sensor, and an expansion valve electrically connected to the control device, respectively; the expansion valve is arranged on a connecting pipeline of the first switch valve and the liquid inlet port; the first pressure sensor and the first temperature sensor are respectively arranged on a connecting pipeline of the third switch valve and the air outlet interface; after the first switch valve and the third switch valve are controlled to be opened and the second switch valve and the fourth switch valve are controlled to be closed, the method further comprises the steps of:
controlling the expansion valve to be opened;
acquiring a real-time pressure value fed back by a first pressure sensor, and acquiring a saturation temperature TP corresponding to the real-time pressure value;
acquiring a real-time temperature value fed back by a first temperature sensor, setting the real-time temperature value as T1, and calculating a difference value between a real-time saturation temperature TP and the real-time temperature value T1;
acquiring a preset temperature value T01 and a set control precision delta T;
and adjusting the working state of the expansion valve according to the comparison result between the difference value between the real-time saturation temperature TP and the real-time temperature value T1, the set temperature value T01 and the set control precision delta T.
4. A control method of a coiled oil-gas condenser according to claim 3, wherein the adjusting the working state of the expansion valve according to the comparison result between the difference between the real-time saturation temperature TP and the real-time temperature value T1 and the set temperature value T01 and the set control precision Δt specifically comprises:
when T01-delta T is less than or equal to TP-T1 and less than or equal to T01+delta T, the expansion valve is controlled to keep the working state unchanged;
when TP-T1 is more than T01+DeltaT, the opening degree of the expansion valve is controlled to be increased;
when TP-T1 is smaller than T01-DeltaT, the opening degree of the expansion valve is controlled to be reduced.
5. The control method of a coiled oil-gas condenser according to claim 1, wherein a heat exchange coil is arranged in the shell, a liquid inlet end of the heat exchange coil is connected with the liquid inlet interface, and an air outlet end of the heat exchange coil is connected with the air outlet interface; a plurality of baffle plates which are distributed at intervals are further arranged in the shell, and the adjacent baffle plates are arranged up and down.
6. The control method of a coiled oil-gas condenser according to claim 5, wherein the heat exchange coil comprises a plurality of heat exchange tube groups arranged side by side, the heat exchange tube groups comprise a plurality of heat exchange tubes and a plurality of heat exchange tube bends, the heat exchange tubes are arranged at intervals up and down, and the heat exchange tubes adjacent up and down are connected through the heat exchange tube bends; the heat exchange tube at the lowest part of the heat exchange tube group is connected with the liquid inlet interface, and the heat exchange tube at the highest part of the heat exchange tube group is connected with the air outlet interface.
7. The control method of a coiled tubing oil-gas condenser according to claim 6, wherein a liquid separator, a gas collecting tube and a plurality of liquid separating tubes are further arranged in the shell; the liquid inlet ports are respectively connected with one ends of a plurality of liquid separation pipes through the liquid separators, and the other ends of the liquid separation pipes are respectively connected with a plurality of heat exchange pipe groups in a one-to-one correspondence manner; the uppermost heat exchange tubes of the heat exchange tube groups are respectively connected with one end of the gas collecting tube, and the other end of the gas collecting tube is connected with the gas outlet interface.
8. The method of claim 6, wherein the housing comprises a first end cap, a second end cap, a first tube sheet, a second tube sheet, and a tube body, the first end cap being connected to one end of the tube body by the first tube sheet, the second end cap being connected to the other end of the tube body by the second tube sheet; the liquid inlet port and the air outlet port are respectively arranged on the first end cover, and the oil gas inlet and the oil gas outlet are respectively arranged on the top of the pipe body; the heat exchange tubes are arranged between the first tube plate and the second tube plate, and the heat exchange tube bends are arranged in a first cavity formed between the first tube plate and the first end cover or in a second cavity formed between the second tube plate and the second end cover.
9. The control method of a coiled tubing oil-gas condenser of claim 6, wherein baffles are respectively arranged at two ends of the baffle plate, and a surface coating is arranged on the outer surface of the heat exchange tube.
10. The method of claim 5, wherein the bottom of the housing is further provided with an oil and gas condensate outlet and a mounting base.
CN202310345052.1A 2023-03-31 2023-03-31 Control method of coiled pipe type oil-gas condenser Pending CN116407863A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310345052.1A CN116407863A (en) 2023-03-31 2023-03-31 Control method of coiled pipe type oil-gas condenser

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310345052.1A CN116407863A (en) 2023-03-31 2023-03-31 Control method of coiled pipe type oil-gas condenser

Publications (1)

Publication Number Publication Date
CN116407863A true CN116407863A (en) 2023-07-11

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310345052.1A Pending CN116407863A (en) 2023-03-31 2023-03-31 Control method of coiled pipe type oil-gas condenser

Country Status (1)

Country Link
CN (1) CN116407863A (en)

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