CN115978847A - Non-condensable gas condensation adsorption separation discharge system in refrigeration or heat pump unit and intelligent control method thereof - Google Patents
Non-condensable gas condensation adsorption separation discharge system in refrigeration or heat pump unit and intelligent control method thereof Download PDFInfo
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Abstract
The invention discloses a non-condensable gas condensation, adsorption, separation and discharge system in a refrigeration or heat pump unit and an intelligent control method thereof. Has the following beneficial effects: the mixture of the high-temperature high-pressure non-condensable gas and the vapor-state refrigerant in the condenser is used as a heat source for desorption of the adsorbent in the sleeve type adsorption separator, so that the desorption process of the adsorbent is realized; the throttled refrigerant is used as a refrigerant to condense a high-temperature non-condensable gas mixture, so that a gaseous refrigerant in the mixture can be condensed into liquid, and the separation of the non-condensable gas and the refrigerant is realized; the discharge process of the non-condensable gas is controlled by utilizing the pressure difference between the condenser and the coil type recovery condenser and the pressure difference between the coil type recovery condenser and the sleeve type adsorption separator, the electromagnetic valve is opened and closed effectively and timely, and the realization process is simple and reliable.
Description
Technical Field
The invention belongs to the technical field of discharge systems, and relates to a non-condensable gas condensation adsorption separation discharge system in a refrigeration or heat pump unit and an intelligent control method thereof, in particular to a non-condensable gas condensation adsorption separation differential pressure discharge system which separates and discharges non-condensable gas in a condenser of the refrigeration or heat pump unit from a refrigerant and has the function of reducing the content of the refrigerant in exhaust gas to the maximum extent and an intelligent control method thereof.
Background
When the refrigerating or heat pump unit is operated, stopped and overhauled, air, moisture or other non-condensable gases inevitably permeate into the unit. The presence of non-condensable gases will result in increased condensing temperatures, increased compressor discharge pressures and temperatures, and increased corrosivity. Therefore, the non-condensable gas should be discharged in time so as not to affect the operation efficiency of the unit. The common method adopts a pump type air extraction and recovery device, a differential pressure type pump-free exhaust and recovery device and an oil pressure type pump-free air extraction and recovery device for discharging. Wherein: the pump type air extraction and recovery device is composed of a small-sized piston compressor, an oil separator, a recovery condenser, a recooler, a differential pressure switch, a filtering dryer, a throttler, an electromagnetic valve and the like, can automatically remove non-condensable gas and recover refrigerant, and can also be used as vacuumizing or pressurizing equipment of a unit; the differential pressure type pump-free exhaust gas recovery device consists of a recovery condenser, a dryer, a filter, a differential pressure relay and a control valve, realizes the discharge of non-condensable gas and the recovery of refrigerant by utilizing the pressure difference between the condenser and an evaporator, and is easy to carry refrigerant gas in exhaust gas; the oil pressure type pump-free air exhaust recovery device comprises a high-level oil groove, a three-way electromagnetic valve, a dryer, a recovery condenser, a ball float valve, a one-way valve and the like, lubricating oil in the high-level oil groove is introduced into the recovery condenser, the oil level in the recovery condenser rises, non-condensable gas is compressed, after pressure reaches a certain value, an exhaust valve is opened, the non-condensable gas is discharged, the device needs the high-level oil groove, and meanwhile, refrigerant gas is easily entrained in exhaust.
Disclosure of Invention
The invention aims to provide a non-condensable gas condensation, adsorption, separation and discharge system in a refrigeration or heat pump unit and an intelligent control method thereof, which can effectively overcome the defects of the existing method for discharging the non-condensable gas in the refrigeration or heat pump unit, can reduce the content of a refrigerant in exhaust gas to the maximum extent, and reduce the pollution of the refrigerant to the environment.
The technical scheme adopted by the invention is as follows:
a non-condensable gas condensing, adsorbing, separating and discharging system in a refrigeration or heat pump unit comprises a condenser, a coiled pipe type recovery condenser, a sleeve type adsorption separator, a dryer, a filter, a differential pressure sensor, an evaporator, a programmable logic controller, an electric switch valve and an electromagnetic valve; the upper part of the condenser is communicated with the upper part of the sleeve type adsorption separator through a pipeline by an electric switch valve V1, a filter and an electric switch valve V2; the upper end of the sleeve-type adsorption separator is evacuated through a pipeline by an electromagnetic valve V12, the lower part of the sleeve-type adsorption separator is communicated with the upper part of the coiled pipe type recovery condenser through a pipeline by an electric switch valve V3 and an electric switch valve V4, the upper part of the sleeve-type adsorption separator is communicated with the upper end of the dryer through a pipeline by an electric switch valve V11 and an electric switch valve V6, and the lower end of the sleeve-type adsorption separator is communicated with the upper end of the coiled pipe type recovery condenser through a pipeline by an electromagnetic valve V13; the throttled working medium is communicated with the upper part of a coiled recovery condenser through a pipeline and an electric switch valve V8 through a filter, the lower part of the coiled recovery condenser is communicated with an evaporator through a pipeline and an electric switch valve V9 and an electric switch valve V10, and the lower end of the coiled recovery condenser is communicated with the upper end of a dryer through a pipeline and an electric switch valve V5; the lower end of the dryer is communicated with the evaporator through a pipeline via an electric switch valve V7 and an electric switch valve V10; a differential pressure sensor I for detecting the differential pressure between the condenser and the coil type recovery condenser is arranged between the condenser and the coil type recovery condenser through a data line; a differential pressure sensor II for detecting the differential pressure between the coil pipe type recovery condenser and the sleeve pipe type adsorption separator is arranged between the coil pipe type recovery condenser and the sleeve pipe type adsorption separator through a data line; the programmable controller is connected with the electromagnetic valves V12 and V13 through data lines respectively, and performs on-off control according to the delta P1 and the delta P2.
The coil pipe type recovery condenser is composed of a shell and a coil pipe in the shell, a throttled refrigerant is absorbed and evaporated in the coil pipe and returns to an evaporator, a mixture of high-temperature non-condensable gas and gaseous refrigerant is condensed outside the coil pipe to release heat, and the gaseous refrigerant is condensed into liquid, so that separation of the non-condensable gas and the refrigerant is realized.
The sleeve type adsorption separator is composed of a fin type outer sleeve, an adsorbent filling layer, an inner sleeve, an adsorbent filling layer and a fin type outer sleeve, and the whole double-symmetrical structure is formed; the mixture of high-temperature non-condensable gas and refrigerant passes through the inner sleeve, and non-condensable gas containing trace refrigerant gas passes through the adsorbent filling layer.
The working process of the invention is as follows: the mixture of the non-condensable gas with high temperature and high pressure and the vapor-state refrigerant in the condenser firstly passes through a sleeve type adsorption separator and is used as a heat source for desorbing the adsorbent in the sleeve to heat a sleeve type adsorbent filling layer; then the high-temperature high-pressure mixture enters a coil pipe type recovery condenser, in the coil pipe type recovery condenser, the vaporous refrigerant in the mixture is cooled and condensed into liquid by the throttled refrigerant, and the non-condensable gas in the mixture is still in a gas state; refrigerant liquid in the coil pipe type recovery condenser enters an evaporator after passing through a dryer; the non-condensable gas in the coil pipe type recovery condenser enters a sleeve type adsorption separator through an electromagnetic valve, the trace refrigerant gas contained in the non-condensable gas is adsorbed in an adsorbent layer, and the non-condensable gas is exhausted to the environment.
An intelligent control method for a non-condensable gas condensation adsorption separation discharge system in a refrigeration or heat pump unit comprises the following steps:
before the separation and discharge of the non-condensable gas, all electric switch valves and electromagnetic valves are in a closed state, the mixture of the non-condensable gas and the gaseous refrigerant is led out from the upper part of the condenser, and the gaseous refrigerant is adsorbed in the adsorbent of the double-pipe adsorption separator:
1) And (3) condensation and separation processes: opening electric switch valves V1-V4, V6, V7 and V9-V11, introducing the mixture of non-condensable gas and gaseous refrigerant at the upper part of the condenser 1 into a coil type recovery condenser through a sleeve type adsorption separator, simultaneously, opening an electric switch valve V8, and introducing the throttled refrigerant into the coil type recovery condenser after passing through a filter (5), wherein the following three processes occur: (1) when the high-temperature mixed gas passes through the sleeve type adsorption separator, the adsorbent filling layer is heated to regenerate the adsorbent and release the refrigerant, and the refrigerant returns to the evaporator through the electric switch valve V11, the electric switch valve V6, the dryer, the electric switch valve V7 and the electric switch valve V10 after being released; (2) the throttled refrigerant absorbs heat and evaporates in the coil pipe type recovery condenser, and returns to the evaporator through electric switch valves V9 and V10 after being evaporated; (3) the mixture of the non-condensable gas and the gaseous refrigerant is subjected to heat release condensation in the coil pipe type recovery condenser, and the gaseous refrigerant is condensed into liquid, so that the separation of the non-condensable gas and the refrigerant is realized;
2) Differential pressure exhaust process from the coiled pipe type recovery condenser to the sleeve type adsorption separator: closing electric switch valves V1-V4, V6, V7 and V9-V11, and in the coiled recovery condenser), because the gaseous refrigerant in the mixture is condensed into liquid, the pressure in the coiled recovery condenser is reduced, so that a pressure difference delta P1 occurs between the condenser and the coiled recovery condenser, the pressure difference sensor I feeds the delta P1 back to the programmable controller, if the delta P1 is greater than a set value, the programmable controller sends out a control signal, the electromagnetic valve V13 is opened, and the non-condensable gas in the coiled recovery condenser is discharged into the sleeve type adsorption separator; meanwhile, detecting a pressure difference delta P2 between the coiled recovery condenser and the sleeve type adsorption separator, and closing the electromagnetic valve V13 if the delta P2= 0;
3) And (3) an adsorption separation process: after entering the sleeve type adsorption separator, the non-condensable gas containing trace gaseous refrigerant is adsorbed by the adsorbent, the process is a heat release process, and the non-condensable gas is still in a suspension state;
4) Evacuation of non-condensable gases: after adsorption is finished, the pressure in the sleeve type adsorption separator is reduced, namely, a pressure difference delta P2 exists between the coiled pipe type recovery condenser and the sleeve type adsorption separator, if the delta P2 is larger than a set planting position, the electromagnetic valve V12 is opened, non-condensable gas in the sleeve type adsorption separator is discharged, and the electromagnetic valve V12 is closed after the programmable controller delays;
5) Liquid refrigerant discharge to evaporator process: opening electric switch valves V5, V7 and V10, discharging the liquid refrigerant in the coil pipe type recovery condenser to an evaporator after passing through a dryer, and finishing the separation and discharge process of the non-condensable gas; and the trace refrigerant adsorbed by the adsorbent in the sleeve type adsorption separator is heated by high-temperature steam in the next cycle to complete the desorption process, and the trace refrigerant steam returns to the evaporator after passing through the dryer.
The invention has the following beneficial effects:
1. the invention adds the sleeve type adsorption separator on the basis of the differential pressure type exhaust gas recovery device, can reduce the content of gaseous refrigerant in non-condensable gas to the maximum extent, reduce the pollution of the refrigerant to the environment and reduce the consumption of the refrigerant.
2. The invention uses the mixture of the high-temperature high-pressure non-condensable gas and the vapor refrigerant from the condenser as the heat source for the desorption of the adsorbent in the sleeve type adsorption separator, can realize the desorption process of the adsorbent and simultaneously saves the heat source modes such as electric heating and the like.
3. The outer sleeve of the sleeve type adsorption separator adopts a finned tube structure, so that the natural convection heat exchange quantity between the sleeve type adsorption separator and the environment can be effectively enhanced, and the adsorption heat can be quickly released into the environment.
4. The invention uses the throttled refrigerant as the refrigerant to condense the high-temperature non-condensable gas mixture, can condense the gaseous refrigerant in the mixture into liquid, and realizes the separation of the non-condensable gas and the refrigerant.
5. The invention controls the discharge process of the non-condensable gas by utilizing the pressure difference between the condenser and the coil type recovery condenser and the pressure difference between the coil type recovery condenser and the sleeve type adsorption separator, can effectively and timely open and close the electromagnetic valve, and has simple and reliable realization process.
6. The separated refrigerant finally returns to the evaporator to participate in the refrigeration or heat pump circulation of the unit again, and the circulation quantity of the refrigerant of the unit is ensured.
7. The invention can be used in a refrigerating unit or a heat pump unit to realize separation and discharge of non-condensable gas of the unit and recycling of refrigerant.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view showing the structure of the double pipe adsorption separator of the present invention.
In the figure: 1-a condenser; 2-coil type recovery condenser; 3-a double pipe type adsorption separator; 4-a dryer; 5-a filter; 6-differential pressure sensor; 7-an evaporator; 8-a programmable controller; 9-finned outer sleeve; 10-a packed layer of adsorbent; 11-inner sleeve; V1-V11-electric switch valve; v12 and V13-solenoid valves;
Detailed Description
The following further describes a specific embodiment of the present invention with reference to the drawings and technical solutions.
As shown in fig. 1, the system for condensing, adsorbing, separating and discharging non-condensable gas in a refrigeration or heat pump unit of the present invention comprises a condenser 1, a coiled pipe type recovery condenser 2, a sleeve type adsorption separator 3, a dryer 4, a filter 5, a differential pressure sensor 6, an evaporator 7, a programmable controller 8, an electric switch valve and an electromagnetic valve. The upper part of the condenser 1 is communicated with the upper part of the sleeve type adsorption separator 3 through a pipeline by an electric switch valve V1, a filter 5 and an electric switch valve V2. The upper end of the sleeve type adsorption separator 3 is evacuated through the electromagnetic valve V12 through a pipeline, the lower part of the sleeve type adsorption separator 3 is communicated with the upper part of the coil type recovery condenser 2 through the pipeline through the electric switch valve V3 and the electric switch valve V4, the upper part of the sleeve type adsorption separator 3 is also communicated with the upper end of the drier 4 through the pipeline through the electric switch valve V11 and the electric switch valve V6, and the lower end of the sleeve type adsorption separator 3 is communicated with the upper end of the coil type recovery condenser 2 through the pipeline through the electromagnetic valve V13. The throttled working medium is communicated with the upper part of the coiled recovery condenser 2 through a filter 5 and an electric switch valve V8 by pipelines, the lower part of the coiled recovery condenser 2 is communicated 7 with the evaporator through an electric switch valve V9 and an electric switch valve V10 by pipelines, and the lower end of the coiled recovery condenser 2 is communicated with the upper end of the dryer 4 through an electric switch valve V5 by pipelines. The lower end of the dryer 4 is communicated with the evaporator 7 through a pipeline via an electric switch valve V7 and an electric switch valve V10. A differential pressure sensor I6-1 for detecting the differential pressure between the condenser 1 and the coil type recovery condenser 2 is arranged between the two condensers through a data line; a differential pressure sensor II6-2 for detecting the differential pressure between the coil pipe type recovery condenser 2 and the sleeve pipe type adsorption separator 3 is arranged between the coil pipe type recovery condenser and the sleeve pipe type adsorption separator through a data line; the programmable controller 8 is connected to the electromagnetic valves V12 and V13 via data lines, and performs on-off control according to Δ P1 and Δ P2.
The coil pipe type recovery condenser 2 is composed of a shell and a coil pipe arranged in the shell, the throttled refrigerant absorbs heat in the coil pipe and evaporates back to the evaporator 7, the mixture of high-temperature non-condensable gas and gaseous refrigerant is condensed and released heat outside the coil pipe, and the gaseous refrigerant is condensed into liquid, so that separation of the non-condensable gas and the refrigerant is realized.
As shown in fig. 2, the double-pipe adsorption separator 3 is composed of a finned outer sleeve 9, an adsorbent filling layer 10, an inner sleeve 11, an adsorbent filling layer 10 and a finned outer sleeve 9, and is integrally symmetrical; the mixture of the high-temperature non-condensable gas and the refrigerant passes through the inner sleeve 11, and the non-condensable gas containing a trace amount of refrigerant gas passes through the adsorbent filling layer 10.
The invention relates to an intelligent control method of a non-condensable gas condensation adsorption separation discharge system in a refrigeration or heat pump unit, which comprises the following steps:
before the separation and discharge of the non-condensable gas, all electric switch valves and electromagnetic valves are in a closed state, the mixture of the non-condensable gas and the gaseous refrigerant is led out from the upper part of the condenser 1, and the gaseous refrigerant is adsorbed in the adsorbent of the double-pipe type adsorption separator 3:
1) And (3) condensation and separation processes: opening electric switch valves V1-V4, V6, V7 and V9-V11, introducing a non-condensable gas and gaseous refrigerant mixture at the upper part of the condenser (1) into the coiled recovery condenser 2 through a sleeve type adsorption separator (3), simultaneously, opening the electric switch valve V8, and introducing the throttled refrigerant into the coiled recovery condenser 2 after passing through a filter 5, wherein the following three processes occur: (1) when the high-temperature mixed gas passes through the sleeve type adsorption separator 3, the adsorbent filling layer 10 is heated to regenerate the adsorbent and release the refrigerant, and the refrigerant returns to the evaporator 7 after being released through the electric switch valve V11, the electric switch valve V6, the dryer 4, the electric switch valve V7 and the electric switch valve V10; (2) the throttled refrigerant absorbs heat and evaporates in the coil type recovery condenser 2, and returns to the evaporator 7 through electric switch valves V9 and V10 after being evaporated; (3) the mixture of the non-condensable gas and the gaseous refrigerant is subjected to heat release condensation in the coil pipe type recovery condenser 2, and the gaseous refrigerant is condensed into liquid, so that the separation of the non-condensable gas and the refrigerant is realized;
2) Differential pressure exhaust process from the coil recovery condenser 2 to the sleeve type adsorption separator 3: closing the electric switch valves V1-V4, V6, V7 and V9-V11, in the coil type recovery condenser 2, as the gaseous refrigerant in the mixture is condensed into liquid, the pressure in the coil type recovery condenser 2 is reduced, so that a pressure difference delta P1 occurs between the condenser 1 and the coil type recovery condenser 2, the pressure difference sensor I6-1 feeds back the delta P1 to the programmable controller 8, if the delta P1 is larger than a set value, the programmable controller 8 sends out a control signal, the electromagnetic valve V13 is opened, and the non-condensable gas in the coil type recovery condenser 2 is discharged into the sleeve type adsorption separator 3; meanwhile, detecting a pressure difference Δ P2 between the coil recovery condenser 2 and the double-pipe adsorption separator 3, and if Δ P2=0, closing the electromagnetic valve V13;
3) An adsorption separation process: after entering the sleeve type adsorption separator 3, the non-condensable gas containing trace gaseous refrigerant is adsorbed by the adsorbent, the process is a heat release process, and the non-condensable gas is still in a suspension state;
4) Evacuation of non-condensable gases: after adsorption is finished, the pressure in the sleeve type adsorption separator is reduced, namely, a pressure difference delta P2 exists between the coiled pipe type recovery condenser 2 and the sleeve type adsorption separator 3, if the delta P2 is larger than a set value, the electromagnetic valve V12 is opened, non-condensable gas in the sleeve type adsorption separator 3 is discharged, and the electromagnetic valve V12 is closed after the programmable logic controller 8 delays;
5) Discharge of liquid refrigerant to the evaporator 7: opening electric switch valves V5, V7 and V10, and discharging the liquid refrigerant in the coil type recovery condenser) to the evaporator 7 after passing through the dryer 4, and finishing the separation and discharge process of the non-condensable gas; the trace refrigerant absorbed by the absorbent in the double-pipe type adsorption separator 3 is heated by high-temperature steam in the next cycle to complete the desorption process, and the trace refrigerant steam returns to the evaporator 7 after passing through the dryer 4.
Claims (4)
1. A non-condensable gas condensation adsorption separation discharge system in a refrigeration or heat pump unit comprises a condenser (1), a coil pipe type recovery condenser (2), a sleeve type adsorption separator (3), a dryer (4), a filter (5), a differential pressure sensor (6), an evaporator (7), a programmable logic controller (8), an electric switch valve and an electromagnetic valve; the device is characterized in that the upper part of the condenser (1) is communicated with the upper part of the sleeve type adsorption separator (3) through a pipeline by an electric switch valve V1, a filter (5) and an electric switch valve V2; the upper end of the sleeve-type adsorption separator (3) is evacuated through a solenoid valve V12 through a pipeline, the lower part of the sleeve-type adsorption separator (3) is communicated with the upper part of the coil recovery condenser (2) through an electric switch valve V3 and an electric switch valve V4 through pipelines, the upper part of the sleeve-type adsorption separator (3) is communicated with the upper end of the dryer (4) through an electric switch valve V11 and an electric switch valve V6 through pipelines, and the lower end of the sleeve-type adsorption separator (3) is communicated with the upper end of the coil recovery condenser (2) through a solenoid valve V13 through a pipeline; the throttled working medium is communicated with the upper part of a coiled recovery condenser (2) through a pipeline and a filter (5) and an electric switch valve V8, the lower part of the coiled recovery condenser (2) is communicated (7) with an evaporator through a pipeline and an electric switch valve V9 and an electric switch valve V10, and the lower end of the coiled recovery condenser (2) is communicated with the upper end of a dryer (4) through a pipeline and an electric switch valve V5; the lower end of the dryer (4) is communicated with the evaporator (7) through a pipeline via an electric switch valve V7 and an electric switch valve V10; a differential pressure sensor I (6-1) for detecting the differential pressure between the condenser (1) and the coil pipe type recovery condenser (2) is arranged between the condenser and the coil pipe type recovery condenser through a data line; a differential pressure sensor II (6-2) for detecting the differential pressure between the coil pipe type recovery condenser (2) and the sleeve pipe type adsorption separator (3) is arranged between the coil pipe type recovery condenser and the sleeve pipe type adsorption separator through a data line; the programmable controller (8) is connected with the electromagnetic valves V12 and V13 through data lines respectively, and performs on-off control according to the delta P1 and the delta P2.
2. The system for condensing, adsorbing, separating and discharging non-condensable gas in a refrigeration or heat pump unit as claimed in claim 1, wherein the coil type recovery condenser (2) is composed of a shell and a coil therein, the throttled refrigerant is evaporated back to the evaporator (7) in the coil in an absorbing way, the mixture of high-temperature non-condensable gas and gaseous refrigerant is condensed outside the coil to release heat, and the gaseous refrigerant is condensed into liquid, so that separation of the non-condensable gas from the refrigerant is realized.
3. The condensation, adsorption, separation and discharge system for the non-condensable gases in a refrigeration or heat pump unit as claimed in claim 1 or 2, wherein the double pipe type adsorption separator (3) is composed of a finned outer sleeve (9), an adsorbent filling layer (10), an inner sleeve (11), the adsorbent filling layer (10) and the finned outer sleeve (9), and is of a symmetrical structure as a whole; the mixture of high-temperature non-condensable gas and refrigerant passes through the inner sleeve (11), and non-condensable gas containing a small amount of refrigerant gas passes through the adsorbent filling layer (10).
4. An intelligent control method for a non-condensable gas condensation, adsorption, separation and discharge system in a refrigeration or heat pump unit is characterized by comprising the following steps:
before the separation and discharge of the non-condensable gas, all electric switch valves and electromagnetic valves are in a closed state, the mixture of the non-condensable gas and the gaseous refrigerant is led out from the upper part of the condenser (1), and the gaseous refrigerant is adsorbed in the adsorbent of the double-pipe type adsorption separator (3):
1) And (3) condensation and separation processes: opening electric switch valves V1-V4, V6, V7 and V9-V11, introducing a non-condensable gas and gaseous refrigerant mixture at the upper part of the condenser (1) into the coil type recovery condenser (2) through a sleeve type adsorption separator (3), simultaneously, opening the electric switch valve V8, and introducing the throttled refrigerant into the coil type recovery condenser (2) after passing through a filter (5), wherein the following three processes occur: (1) when the high-temperature mixed gas passes through the sleeve type adsorption separator (3), the adsorbent filling layer (10) is heated to regenerate the adsorbent and release the refrigerant, and the refrigerant returns to the evaporator (7) after being released through the electric switch valve V11, the electric switch valve V6, the dryer (4), the electric switch valve V7 and the electric switch valve V10; (2) the throttled refrigerant absorbs heat and evaporates in the coil type recovery condenser (2), and returns to the evaporator (7) through the electric switch valves V9 and V10 after evaporating; (3) the mixture of the non-condensable gas and the gaseous refrigerant is subjected to heat release condensation in the coil type recovery condenser (2), and the gaseous refrigerant is condensed into liquid, so that the separation of the non-condensable gas and the refrigerant is realized;
2) Differential pressure exhaust process from the coil pipe type recovery condenser (2) to the sleeve pipe type adsorption separator (3): closing electric switch valves V1-V4, V6, V7 and V9-V11, reducing the pressure in the coil type recovery condenser (2) due to the fact that gaseous refrigerant in the mixture is condensed into liquid in the coil type recovery condenser (2), so that a pressure difference delta P1 occurs between the condenser (1) and the coil type recovery condenser (2), feeding back the delta P1 to a programmable controller (8) by a pressure difference sensor I (6-1), and if the delta P1 is larger than a set value, sending out a control signal by the programmable controller (8), opening an electromagnetic valve V13, and discharging non-condensable gas in the coil type recovery condenser (2) into a sleeve type adsorption separator (3); meanwhile, detecting a pressure difference delta P2 between the coiled recovery condenser (2) and the double-pipe type adsorption separator (3), and closing the electromagnetic valve V13 if the delta P2= 0;
3) And (3) an adsorption separation process: after entering the sleeve type adsorption separator (3), the non-condensable gas containing trace gaseous refrigerant is adsorbed by the adsorbent, the process is a heat release process, and the non-condensable gas is still in a suspension state;
4) Non-condensable gas evacuation process: after adsorption is finished, the pressure in the double-pipe type adsorption separator (3) is reduced, namely, a pressure difference delta P2 exists between the coil pipe type recovery condenser (2) and the double-pipe type adsorption separator (3), if the delta P2 is larger than a set value, the electromagnetic valve V12 is opened, non-condensable gas in the double-pipe type adsorption separator (3) is discharged, and the electromagnetic valve V12 is closed after the programmable controller (8) delays;
5) Discharge of liquid refrigerant to evaporator (7): opening electric switch valves V5, V7 and V10, discharging the refrigerant liquid in the coil type recovery condenser (2) to an evaporator (7) after passing through a dryer (4), and finishing the separation and discharge process of the non-condensable gas; and the trace refrigerant adsorbed by the adsorbent in the sleeve type adsorption separator (3) is heated by high-temperature steam in the next cycle to finish the desorption process, and the trace refrigerant steam returns to the evaporator (7) after passing through the dryer (4).
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| CN202310059486.5A CN115978847A (en) | 2023-01-18 | 2023-01-18 | Non-condensable gas condensation adsorption separation discharge system in refrigeration or heat pump unit and intelligent control method thereof |
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| CN202310059486.5A CN115978847A (en) | 2023-01-18 | 2023-01-18 | Non-condensable gas condensation adsorption separation discharge system in refrigeration or heat pump unit and intelligent control method thereof |
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