CN116481336A - Control method of plate-fin type oil-gas condenser - Google Patents
Control method of plate-fin type oil-gas condenser Download PDFInfo
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- CN116481336A CN116481336A CN202310342178.3A CN202310342178A CN116481336A CN 116481336 A CN116481336 A CN 116481336A CN 202310342178 A CN202310342178 A CN 202310342178A CN 116481336 A CN116481336 A CN 116481336A
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000010257 thawing Methods 0.000 claims abstract description 24
- 239000007788 liquid Substances 0.000 claims description 68
- 239000003507 refrigerant Substances 0.000 claims description 31
- 239000004215 Carbon black (E152) Substances 0.000 claims 7
- 229930195733 hydrocarbon Natural products 0.000 claims 7
- 150000002430 hydrocarbons Chemical class 0.000 claims 7
- 230000005494 condensation Effects 0.000 abstract description 6
- 238000009833 condensation Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000012855 volatile organic compound Substances 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
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- 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
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/04—Auxiliary systems, arrangements, or devices for feeding, collecting, and storing cooling water or other cooling liquid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/02—Header boxes; End plates
- F28F9/04—Arrangements for sealing elements into header boxes or end plates
- F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
- F28F9/18—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding
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- 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)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a control method of a plate-fin oil-gas condenser, which comprises the following steps: 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 plate-fin type oil gas condenser executes a condensation mode; 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 executing a defrosting mode when the execution condition is met; acquiring a real-time temperature value fed back by a second temperature sensor, and setting the real-time temperature value as T2; comparing the real-time temperature value T2 with the set temperature value T02, and judging whether to return to the condensation mode according to the comparison result; 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, so that timely defrosting and clean defrosting are realized, the problem that the plate-fin type oil-gas condenser cannot normally operate is avoided, and the operation stability and reliability of the plate-fin type oil-gas condenser are improved.
Description
Technical Field
The invention relates to the technical field of oil gas condensation and liquefaction, in particular to a control method of a plate-fin 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, when carrying out condensation mode, the problem of frosting appears very easily when carrying out oil gas condensation liquefaction in current oil gas condenser, and the problem that can't normally operate often appears in the oil gas condenser after frosting, and when the frost on heat exchanger surface is too much, can crack the heat exchanger and lead to the damage of oil gas condenser and can't continue to work even.
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 plate-fin type oil-gas condenser, which can realize timely defrosting and clean defrosting and has the advantages of high operation stability and good working reliability.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the control method of the plate-fin 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 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; the plate-fin type oil-gas condenser executes a condensing mode;
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;
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 plate-fin oil-gas condenser executes a defrosting mode;
acquiring a real-time temperature value fed back by a second temperature sensor, and setting the real-time temperature value as T2;
and comparing the real-time temperature value T2 with the set temperature value T02, and judging whether to return to the condensing mode according to the comparison result.
In the control method of the plate-fin oil-gas condenser, the comparison of the real-time temperature value T2 and the set temperature value T02 judges whether to return to the condensing mode according to the comparison result, and specifically comprises the following steps:
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 plate-fin oil-gas condenser returns to a condensing mode.
In the control method of the plate-fin type oil-gas condenser, the plate-fin 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 plate-fin 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:
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 plate-fin oil-gas condenser, a plurality of heat exchange plates are arranged in the shell, the bottom ends of the heat exchange plates are respectively connected with the liquid inlet interface, and the top ends of the heat exchange plates are respectively connected with the air outlet interface; a refrigerant flow channel is arranged in the heat exchange plate, and the refrigerant flow channel is a serpentine channel, a herringbone channel, a spherical channel or a straight channel; the outer surface of the heat exchange plate is provided with fins.
In the control method of the plate-fin oil-gas condenser, a liquid distributor and a gas collecting pipe are further arranged in the shell, the bottom ends of the heat exchange plates are respectively connected with the liquid inlet interface through the liquid distributor, and the top ends of the heat exchange plates are respectively connected with the gas outlet interface through the gas collecting pipe.
In the control method of the plate-fin type oil-gas condenser, the shell is further provided with a plurality of baffle plates, the gaps of the baffle plates are distributed among the fins, and the adjacent baffle plates are arranged up and down.
In the control method of the plate-fin oil-gas condenser, the heat exchange plate further comprises an inlet, a first heat exchange plate, a second heat exchange plate and an outlet, wherein the first heat exchange plate is connected with the liquid inlet through the inlet and the second heat exchange plate through the refrigerant flow channel, and the second heat exchange plate is connected with the air outlet through the outlet.
In the control method of the plate-fin type oil-gas condenser, two ends of the fin are respectively provided with a baffle plate.
In the control method of the plate-fin oil-gas condenser, the shell comprises a first end cover, a second end cover, a first tube plate, a second tube plate and a tube body, wherein the first end cover is connected with one end of the tube body through the first tube plate, and the second end cover is connected with the other end of the tube 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; one ends of a plurality of heat exchange plates are respectively connected with the first tube plate, and the other ends of a plurality of heat exchange plates are respectively connected with the second tube plate; the bottom of the tube body is also provided with an oil gas condensed liquid outlet and a mounting seat.
The beneficial effects are that:
the invention provides a control method of a plate-fin oil-gas condenser, which can execute a defrosting mode according to a 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 plate-fin oil-gas condenser cannot normally operate due to the frosting problem, and improve the stability and reliability of the plate-fin 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, the intelligence of the plate-fin type oil-gas condenser in working is improved, the continuity of the plate-fin type oil-gas condenser in working 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 S500 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 a front view of the internal structure of the plate-fin oil and gas condenser provided by the invention;
FIG. 6 is a top view of the internal structure of the plate-fin oil and gas condenser provided by the invention;
FIG. 7 is a bottom view of the internal structure of the plate-fin oil and gas condenser provided by the present invention;
FIG. 8 is a system block diagram of a plate-fin 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 plate, 32-liquid distributor, 33-gas collecting tube, 34-fin, 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 plate-fin oil-gas condenser, which is used for making the purposes, technical schemes and effects of the invention clearer and more definite, and the invention is further described in detail below by referring to the accompanying drawings and the embodiments.
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 plate-fin oil-gas condenser, where the plate-fin oil-gas condenser includes a housing 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 housing 1 is provided with a liquid inlet interface 21 and an air outlet interface 22, and the top of the housing 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; the plate-fin type oil-gas condenser executes a condensing mode;
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;
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 is more than P0, controlling the first switch valve 51 and the third switch valve 53 to be closed, and controlling the second switch valve 52 and the fourth switch valve 54 to be opened, and executing a defrosting mode by the plate-fin type oil-gas condenser;
s400, acquiring a real-time temperature value fed back by the second temperature sensor 62, and setting the real-time temperature value as T2;
s500, comparing the real-time temperature value T2 with the set temperature value T02, and judging whether to return to the condensing mode according to the comparison result.
According to the control method of the plate-fin type oil-gas condenser, a defrosting mode can be executed according to the comparison result of the real-time differential pressure value and the preset differential pressure value, timely defrosting and clean defrosting are achieved, the phenomenon that the plate-fin type oil-gas condenser cannot normally operate due to the frosting problem is avoided, and the stability and reliability of the plate-fin 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, the intelligence of the plate-fin type oil-gas condenser in working is improved, the continuity of the plate-fin type oil-gas condenser in working is ensured, and therefore the use experience of a user is improved.
In the actual working process of the plate-fin oil-gas condenser, if the plate-fin oil-gas condenser has a frosting problem, 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 is larger than or equal to a preset pressure difference value, the frost is indicated to be full of the surface of the fin 34, 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. 2 and 5, the comparing the real-time temperature value T2 with the set temperature value T02, and determining whether to return to the condensing mode according to the comparison result specifically includes the steps of:
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 plate-fin type oil-gas condenser returns to a condensing mode.
When the plate-fin 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 plate-fin oil-gas condenser can stop stopping defrosting and restore to a condensing mode again after finishing defrosting so as to condense and liquefy the oil gas again; when the plate-fin type oil-gas condenser executes a condensing mode, low-temperature refrigeration liquid is input into the liquid distributor 32 from the liquid inlet port 21, the refrigerant is uniformly distributed into the plurality of heat exchange plates 31 through the liquid distributor 32, flows into the gas collecting tube 33 along the refrigerant flow channel in the heat exchange plates 31, and then is discharged out of the plate-fin type oil-gas condenser through the gas outlet port 22; the oil gas to be condensed and liquefied enters the plate-fin type oil gas condenser through the oil gas inlet 23, exchanges heat with the refrigerant in the plurality of heat exchange plates 31 respectively, rectifies the oil gas fluid through the baffle plate 35, discharges part of the oil gas after heat exchange through the oil gas outlet 24, and discharges part of condensed liquid through the oil gas condensed liquid outlet 25.
Further, referring to fig. 3 and 5, the plate-fin oil-gas condenser further includes a first pressure sensor 63, a first temperature sensor 61, and an expansion valve 55, which are 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 plate-fin 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 plate-fin oil-gas condenser is ensured, the condensing and liquefying effects on oil gas are ensured, and the stability and reliability of the plate-fin 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 plate-fin oil-gas condenser executes the defrosting mode, if TP-T1 is larger than T01+DeltaT, the fact that the flow of the refrigerant in the plate-fin oil-gas condenser is insufficient is indicated, the superheat degree at the air outlet interface 22 of the oil-gas condenser is higher, and the expansion valve 55 needs to be opened to increase the flow of the refrigerant; when TP-T1 is smaller than T01-delta T, the flow of the refrigerant in the plate-fin type oil-gas condenser is overlarge, the superheat degree at the gas outlet interface 22 of the oil-gas condenser is lower, and the expansion valve 55 is required 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 plurality of heat exchange plates 31 are disposed in the housing 1, bottom ends of the plurality of heat exchange plates 31 are respectively connected to the liquid inlet port 21, and top ends of the plurality of heat exchange plates 31 are respectively connected to the air outlet port 22; a refrigerant flow passage is arranged in the heat exchange plate 31, and is a serpentine passage, a herringbone passage, a spherical passage or a straight passage; the outer surface of the heat exchange plate 31 is provided with fins 34.
In the embodiment, by arranging the heat exchange plates 31, the refrigerant flow channels are arranged in the heat exchange plates 31, and the refrigerant naturally flows along the refrigerant flow channels after entering the refrigerant flow channels in the heat exchange plates 31 without being baffled, so that the problem of uneven distribution caused by the redistribution of the refrigerant 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 plate-fin type oil-gas condenser are improved; in addition, adopt heat transfer board 31 to exchange heat, promoted the heat transfer area of contact of refrigerant and oil gas by a wide margin, optimized by current line contact for the face contact, improved the heat transfer effect of plate-fin type oil gas condenser by a wide margin, and the surface of heat transfer board 31 is provided with fin 34, has expanded the heat transfer area of heat transfer board 31 surface, compares with prior art, and the heat transfer area of heat transfer board 31 of this application has increased 2-3 times, has effectively improved the condensing liquefaction effect of plate-fin type oil gas condenser to oil gas.
Further, referring to fig. 5 to 7, a liquid distributor 32 and a gas collecting tube 33 are further disposed in the housing 1, the bottom ends of the plurality of heat exchange plates 31 are respectively connected with the liquid inlet port 21 through the liquid distributor 32, and the top ends of the plurality of heat exchange plates 31 are respectively connected with the gas outlet port 22 through the gas collecting tube 33; in this embodiment, the liquid distributor 32 includes a liquid distributor and a plurality of liquid distributing pipes, the liquid distributor is connected to the liquid inlet 21, and a plurality of liquid distributing pipes are connected to the bottom ends of the heat exchange plates 31 in a one-to-one correspondence, and the liquid distributor 32 distributes the refrigerant into each heat exchange plate 31 uniformly, so that the distribution uniformity of the refrigerant is greatly improved, each heat exchange plate 31 is fully utilized, and the heat exchange efficiency of the plate-fin type oil-gas condenser is greatly improved.
Further, referring to fig. 5 to 7, the housing 1 is further provided with a plurality of baffles 35, a plurality of baffles 35 are spaced between a plurality of fins 34, and adjacent baffles 35 are disposed 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.
By arranging the baffle plate 35 in the shell 1, orderly and orderly rectifying the oil-gas fluid, two heat exchange fluids orderly flow, and stable heat exchange temperature difference is realized, so that the heat exchange efficiency of the plate-fin oil-gas condenser is greatly improved.
Further, referring to fig. 5 to 7, the heat exchange plate 31 further includes an inlet, a first heat exchange plate, a second heat exchange plate, and an outlet, wherein the first heat exchange plate is connected to the liquid inlet 21 through the inlet, and is connected to the second heat exchange plate through the refrigerant flow channel, and the second heat exchange plate is connected to the air outlet 22 through the outlet; when the plate-fin oil-gas condenser executes the condensing mode, the refrigerant is input into the shell 1 through the liquid inlet 21, then distributed into each heat exchange plate 31 in uniformity through liquid distribution, enters the first heat exchange plate through the inlet, flows into the second heat exchange plate along the refrigerant flow channel, and then flows into the gas collecting tube 33 through the outlet, so that the heat exchange process with oil gas is completed.
Further, referring to fig. 5 to 7, two ends of the fin 34 are respectively provided with a baffle 36 for limiting the movable position of the fin 34, and for performing a heat conduction function, further increasing the heat exchange area of the plate-fin type oil-gas condenser and improving the heat exchange performance of the plate-fin type oil-gas condenser; in this embodiment, the baffle plates 36 are welded to both ends of the fin 34, respectively.
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; one ends of a plurality of heat exchange plates 31 are respectively connected with the first tube plate 13, and the other ends of a plurality of heat exchange plates 31 are respectively connected with the second tube plate 14; the bottom of the pipe body 15 is also provided with an oil-gas condensed liquid outlet 25 and a mounting seat 16; 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 plates 31 are respectively connected with the inside of the first tube plate 13 and the inside of the second tube plate 14; the oil gas condensed liquid outlet 25 is integrally formed with the housing 1, and the mounting seat 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 plate-fin type oil-gas condenser is characterized in that the plate-fin 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 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; the plate-fin type oil-gas condenser executes a condensing mode;
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, calculating real-time pressure difference values according to the P2 and the P3, and comparing the real-time pressure difference values with a preset pressure difference set value P0;
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 plate-fin oil-gas condenser executes a defrosting mode;
acquiring a real-time temperature value fed back by a second temperature sensor, and setting the real-time temperature value as T2;
and comparing the real-time temperature value T2 with the set temperature value T02, and judging whether to return to the condensing mode according to the comparison result.
2. The method for controlling a plate-fin type hydrocarbon condenser according to claim 1, wherein comparing the real-time temperature value T2 with the set temperature value T02, and determining whether to return to the condensing mode according to the comparison result comprises the steps of:
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 plate-fin oil-gas condenser returns to a condensing mode.
3. The method for controlling a plate-fin hydrocarbon condenser according to claim 1, wherein the plate-fin hydrocarbon condenser further comprises 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 plate-fin type hydrocarbon 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 plate-fin type hydrocarbon condenser according to claim 1, wherein a plurality of heat exchange plates are arranged in the shell, the bottom ends of the plurality of heat exchange plates are respectively connected with the liquid inlet interface, and the top ends of the plurality of heat exchange plates are respectively connected with the air outlet interface; a refrigerant flow channel is arranged in the heat exchange plate, and the refrigerant flow channel is a serpentine channel, a herringbone channel, a spherical channel or a straight channel; the outer surface of the heat exchange plate is provided with fins.
6. The control method of a plate-fin type hydrocarbon condenser according to claim 5, wherein a liquid distributor and a gas collecting tube are further arranged in the shell, bottom ends of the heat exchange plates are respectively connected with the liquid inlet interface through the liquid distributor, and top ends of the heat exchange plates are respectively connected with the gas outlet interface through the gas collecting tube.
7. The method of claim 5, wherein the housing is further provided with a plurality of baffles, a plurality of baffle gaps are distributed among the plurality of fins, and adjacent baffles are arranged up and down.
8. The method of claim 7, wherein the heat exchanger plate further comprises an inlet, a first heat exchanger plate, a second heat exchanger plate, and an outlet, the first heat exchanger plate is connected to the liquid inlet port through the inlet and to the second heat exchanger plate through the refrigerant flow path, and the second heat exchanger plate is connected to the gas outlet port through the outlet.
9. The control method of a plate-fin type hydrocarbon condenser according to claim 5, wherein baffles are respectively provided at both ends of the fin.
10. The method of claim 5, wherein the shell comprises a first end cover, a second end cover, a first tube plate, a second tube plate and a tube body, the first end cover is connected with one end of the tube body through the first tube plate, and the second end cover is connected with the other end of the tube 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; one ends of a plurality of heat exchange plates are respectively connected with the first tube plate, and the other ends of a plurality of heat exchange plates are respectively connected with the second tube plate; the bottom of the tube body is also provided with an oil gas condensed liquid outlet and a mounting seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310342178.3A CN116481336A (en) | 2023-03-31 | 2023-03-31 | Control method of plate-fin type oil-gas condenser |
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| CN202310342178.3A CN116481336A (en) | 2023-03-31 | 2023-03-31 | Control method of plate-fin type oil-gas condenser |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117067633A (en) * | 2023-10-12 | 2023-11-17 | 成都飞机工业（集团）有限责任公司 | Condensing system state monitoring method based on standard condensing curve |
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- 2023-03-31 CN CN202310342178.3A patent/CN116481336A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117067633A (en) * | 2023-10-12 | 2023-11-17 | 成都飞机工业（集团）有限责任公司 | Condensing system state monitoring method based on standard condensing curve |
| CN117067633B (en) * | 2023-10-12 | 2024-03-15 | 成都飞机工业（集团）有限责任公司 | Condensing system state monitoring method based on standard condensing curve |
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