CN111744228A - Oil gas condensing unit with self-defrosting function and oil gas condensing and recycling method - Google Patents
Oil gas condensing unit with self-defrosting function and oil gas condensing and recycling method Download PDFInfo
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- CN111744228A CN111744228A CN202010764729.1A CN202010764729A CN111744228A CN 111744228 A CN111744228 A CN 111744228A CN 202010764729 A CN202010764729 A CN 202010764729A CN 111744228 A CN111744228 A CN 111744228A
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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
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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
- B01D5/0033—Other features
- B01D5/0039—Recuperation of heat, e.g. use of heat pump(s), compression
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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
- B01D5/0033—Other features
- B01D5/0051—Regulation processes; Control systems, e.g. valves
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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
- B01D5/0033—Other features
- B01D5/0054—General arrangements, e.g. flow sheets
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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
- B01D5/0057—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes
- B01D5/0075—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes with heat exchanging
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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
- B01D5/0078—Condensation of vapours; Recovering volatile solvents by condensation characterised by auxiliary systems or arrangements
- B01D5/009—Collecting, removing and/or treatment of the condensate
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- Defrosting Systems (AREA)
Abstract
The invention discloses an oil gas condensing unit with a self-defrosting function and an oil gas condensing and recycling method, wherein the oil gas condensing unit comprises an oil gas compressor, two oil condensing chambers/defrosting chambers, a liquid storage tank, a condenser, a refrigeration compressor, a gas-liquid separator, a gear pump, an oil storage tank, an electromagnetic valve and an electronic expansion valve; the oil-gas compressor is connected with the two oil condensing chambers/defrosting chambers through a first electromagnetic valve and a second electromagnetic valve respectively; the oil gas condensation recovery method adopts an internal and external combined defrosting mode of liquid pipe defrosting and hot gas defrosting, and defrosting is carried out by using the refrigerant liquid in the liquid storage tank, so that the required cooling capacity provided by the system is not influenced; the hot air is blown to frost to quickly melt a frost layer on the surface of the heat exchange coil, and the refrigerant flowing back into the liquid storage tank can provide a certain supercooling degree, so that the refrigerating capacity is improved; the invention has better defrosting effect and high speed, and simultaneously, the two oil condensing chambers/defrosting chambers work alternately to realize continuous and stable operation of oil gas condensation and recovery.
Description
Technical Field
The invention belongs to the technical field of oil gas recovery, and particularly relates to an oil gas condensing unit with a self-defrosting function and an oil gas condensing recovery method.
Background
Oil gas condensing equipment needs to condense oil gas to subzero temperature, and the temperature can be lower under many conditions for heavy ends or high boiling point composition (like water, xylol) in the oil gas solidify very easily and form the frost layer on the heat exchange tube surface of condenser, need do the defrosting and handle just can keep oil gas condensing equipment's continuation, steady operation. The traditional defrosting methods comprise hot gas bypass defrosting, electric heat tracing defrosting and heat pump defrosting, but the defrosting methods have obvious defects: the hot gas bypass defrosting mode has good defrosting effect, but the air delivery quantity of the refrigerating system is reduced to cause insufficient cold quantity, the oil gas condensation effect is poor, and the hot steam causes large thermal stress on the heat exchanger to reduce the service life of the heat exchanger; the electric tracing defrosting also causes the local thermal stress of the heat exchange tube to be overlarge; the defrosting of the heat pump has great influence on the continuity and stability of oil-gas condensation.
Disclosure of Invention
The invention aims to design an oil gas condensing unit with a self-defrosting function and an oil gas condensing recovery method, wherein the oil gas condensing recovery unit adopts an internal and external combined defrosting mode of liquid pipe defrosting and hot gas defrosting, the liquid pipe defrosting is to utilize refrigerant liquid in a liquid storage tank to defrost, and the system is not influenced to provide required cold energy; the hot air blows frost to melt the frost layer on the surface of the heat exchange coil pipe quickly, and meanwhile, the continuous operation of the oil gas condensation recovery system is realized by utilizing the mode that the two oil condensation chambers/the defrosting chambers work alternately.
The purpose of the invention can be realized by adopting the following technical scheme: an oil gas condensing unit with a self-defrosting function and an oil gas condensing and recycling method are provided, wherein the oil gas condensing unit comprises an oil gas compressor, an oil condensing chamber/defrosting chamber I, an oil condensing chamber/defrosting chamber II, a liquid storage tank, a condenser, a refrigeration compressor, a gas-liquid separator, a gear pump, an oil storage tank, an electromagnetic valve, an electronic expansion valve and a control unit electrically connected with the electromagnetic valve and the expansion valve; the oil-gas compressor is respectively connected with the oil condensing chamber/defrosting chamber I and the oil condensing chamber/defrosting chamber II through a first electromagnetic valve and a second electromagnetic valve; the oil condensing chamber/defrosting chamber I is connected with the oil condensing chamber/defrosting chamber II through a third electromagnetic valve, and a fifth electromagnetic valve is arranged between the oil condensing chamber/defrosting chamber I and the oil gas outlet; the oil condensing chamber/defrosting chamber II is connected with an oil gas outlet through a sixth electromagnetic valve; the liquid storage tank, the condenser, the refrigeration compressor and the gas-liquid separator are sequentially connected, and a refrigerant outlet of the liquid storage tank is respectively connected with the oil condensing chamber/defrosting chamber II and the oil condensing chamber/defrosting chamber I through an eighth electromagnetic valve and a ninth electromagnetic valve; the gear pump is arranged between the liquid storage tank, the oil condensation chamber/defrosting chamber I and the oil condensation chamber/defrosting chamber II, an inlet of the gear pump is connected with a liquid outlet at the bottom of the liquid storage tank, and an outlet of the gear pump is respectively connected with the oil condensation chamber/defrosting chamber II and the oil condensation chamber/defrosting chamber I through a tenth electromagnetic valve and an eleventh electromagnetic valve; the gas-liquid separator is respectively connected with the oil condensing chamber/defrosting chamber I and the oil condensing chamber/defrosting chamber II through a thirteenth electromagnetic valve and a fourteenth electromagnetic valve; the oil storage tank is arranged between the oil condensation chamber/defrosting chamber I and the oil condensation chamber/defrosting chamber II.
And heat exchange coil pipes are arranged in the oil condensing chamber/defrosting chamber I and the oil condensing chamber/defrosting chamber II, and nozzles are arranged at the top ends of the oil condensing chamber/defrosting chamber I and the oil condensing chamber/defrosting chamber II and correspond to the heat exchange coil pipes downwards.
The surface layer of the heat exchange coil is provided with an oleophobic coating for reducing the adsorption force of the tube wall to oil drops and promoting the oil drops to slide.
The bottom of the oil condensing chamber/defrosting chamber I is provided with a first oil outlet, the bottom of the oil condensing chamber/defrosting chamber II is provided with a second oil outlet, and the first oil outlet and the second oil outlet are communicated with an oil storage tank.
And the first oil outlet and the second oil outlet are respectively provided with a first ball float valve and a second ball float valve which are used for controlling the liquid level at the bottom of the oil storage tank.
A seventh electromagnetic valve for switching refrigerants and adjusting flow paths is arranged between the oil condensing chamber/defrosting chamber II and the liquid storage tank, and a twelfth electromagnetic valve for switching refrigerants and adjusting flow paths is arranged between the oil condensing chamber/defrosting chamber I and the liquid storage tank.
And a fourth electromagnetic valve is arranged between the first electromagnetic valve and the sixth electromagnetic valve and is connected in series.
The electronic expansion valve comprises a first electronic expansion valve and a second electronic expansion valve, the first electronic expansion valve is arranged between the ninth electromagnetic valve and the oil condensing chamber/defrosting chamber I, and the second electronic expansion valve is arranged between the eighth electromagnetic valve and the oil condensing chamber/defrosting chamber II.
The oil gas condensation recovery method of the oil gas condensing unit with the self-defrosting function adopts an inner and outer combined defrosting mode of liquid pipe defrosting and hot air defrosting, wherein the liquid pipe defrosting is to utilize refrigerant liquid in a liquid storage tank to defrost, the hot air defrosting can quickly melt a frost layer on the surface of a heat exchange coil, and meanwhile, two oil condensing chambers/defrosting chambers are utilized to work alternately, so that the continuous operation of oil gas condensation recovery is realized, and the method specifically comprises the following processes:
a: when the oil condensing chamber/defrosting chamber I is used as a defrosting chamber and the oil condensing chamber/defrosting chamber II is used as an oil condensing chamber, the first electromagnetic valve, the third electromagnetic valve and the sixth electromagnetic valve of an oil-gas loop are opened through the control unit, meanwhile, the eighth electromagnetic valve, the eleventh electromagnetic valve, the twelfth electromagnetic valve and the fourteenth electromagnetic valve of a refrigerant loop are opened through the control unit, the rest electromagnetic valves are closed, oil gas enters the oil-gas compressor from an oil-gas inlet, the pressure and the temperature of the oil gas are increased after the oil gas is compressed by the oil-gas compressor, then the oil gas enters the oil condensing chamber/defrosting chamber I, the pressurized oil gas is sprayed out from a nozzle at the top end of the oil condensing chamber/defrosting chamber I, the sprayed air flow flows downwards to sweep the surface of the heat exchange coil pipe and is contacted with a frost layer, the temperature of the frost layer is increased after the frost layer is heated by the oil gas, the melting of the frost layer is, meanwhile, refrigerant liquid flows out of the lower part of the liquid storage tank and enters the heat exchange coil of the oil condensation chamber/defrosting chamber I under the driving of the gear pump, a frost layer on the surface of the heat exchange coil is rapidly melted under the heating action of the internal refrigerant liquid and oil-gas airflow outside the pipe, the frost layer is attached to the surface of the heat exchange coil after being melted into small droplets, and the small droplets are driven by the oil-gas airflow to be converged into large droplets and then fall from the surface of the heat exchange coil to be accumulated at the bottom of the oil condensation chamber/defrosting chamber I;
b: refrigerant liquid in the liquid storage tank flows through the eighth electromagnetic valve and the second electronic expansion valve, then is changed into a low-temperature and low-pressure state through the throttling action of the second electronic expansion valve, enters the heat exchange coil of the oil condensation chamber/defrosting chamber II, absorbs the heat of oil gas to be vaporized, can carry part of liquid after being incompletely vaporized, enters the gas-liquid separator through the fourteenth electromagnetic valve to be separated to obtain refrigerant vapor, returns to the refrigeration compressor, is pressurized into high-temperature and high-pressure vapor after passing through the refrigeration compressor, is cooled by a refrigerant after entering the condenser, and is condensed into high-pressure and normal-temperature refrigerant liquid which flows into the liquid storage tank; the residual oil gas in the oil condensing chamber/defrosting chamber I enters an oil condensing chamber/defrosting chamber II through a third electromagnetic valve, the oil gas sweeps the surface of a heat exchange coil from top to bottom through a nozzle at the top end of the oil condensing chamber/defrosting chamber II to exchange heat with a low-temperature refrigerant in the oil condensing chamber/defrosting chamber II, the oil gas is condensed into oil drops on the surface of the heat exchange coil and is driven by airflow to drop at the bottom of the oil condensing chamber/defrosting chamber II, and when the liquid level of the condensed oil at the bottoms of the oil condensing chamber/defrosting chamber I and the oil condensing chamber/defrosting chamber II rises to a certain height, a first ball float valve and a second ball float valve are opened, and the condensed oil is discharged into an oil storage tank; the non-condensable gas in the oil condensation chamber/defrosting chamber II passes through a sixth electromagnetic valve and then is discharged from an oil gas outlet;
c: after the oil condensing chamber/defrosting chamber I defrosts, the working modes of the oil condensing chamber/defrosting chamber I and the oil condensing chamber/defrosting chamber II are changed, namely the oil condensing chamber/defrosting chamber I is an oil condensing chamber, and the oil condensing chamber/defrosting chamber II is a defrosting chamber; and a seventh electromagnetic valve, a ninth electromagnetic valve, a tenth electromagnetic valve and a thirteenth electromagnetic valve of the refrigerant circuit are opened, the other electromagnetic valves are closed, and the working flows of the oil-gas circuit and the refrigerant circuit are the same as the conditions of the above a and b, so that the details are not repeated.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention adopts the internal and external combined defrosting mode of liquid pipe defrosting and hot air defrosting, and has better defrosting effect and higher defrosting speed;
2. the liquid pipe defrosting is realized by using the refrigerant liquid in the liquid storage tank, the required cooling capacity provided by the system is not influenced, and the refrigerant reflowing into the liquid storage tank can provide a certain supercooling degree, so that the refrigerating capacity is improved; the hot air frost blowing mode can quickly melt the frost layer on the surface of the heat exchange coil, and hot air can also take away liquid drops formed by melting the frost layer;
3. the oil-gas compressor arranged in the oil-gas condensing unit can increase the speed of oil gas at the outlet of the nozzle, improve the temperature of the oil gas and accelerate the defrosting speed;
4. the hydrophobic coating is arranged on the surface of the heat exchange coil, so that the adhesive force of liquid drops to the pipe wall can be reduced, the dropping of oil liquid is accelerated, and the sufficient heat exchange amount of oil gas and the heat exchange coil is ensured;
5. according to the invention, the continuous operation of the oil gas condensation and recovery system can be realized by the alternative working mode of the oil condensation chamber/defrosting chamber I and the oil condensation chamber/defrosting chamber II, and the automation control degree of the system is high.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the oil-gas condensation recovery method of the present invention;
the labels in the figure are: 1. the oil-gas compressor comprises a 2, a first electromagnetic valve, a 3, an oil condensation chamber/defrosting chamber I, a 4, a second electromagnetic valve, a 5, a nozzle, a 6, a third electromagnetic valve, a 7, a fourth electromagnetic valve, a 8, an oil condensation chamber/defrosting chamber II, a 9, a fifth electromagnetic valve, a 10, a sixth electromagnetic valve, a 11, a seventh electromagnetic valve, a 12, a first electronic expansion valve, a 13, an eighth electromagnetic valve, a 14, a second ball float valve, a 15, a first electronic expansion valve, a 16, a ninth electromagnetic valve, a 17, a liquid storage tank, a 18, a condenser, a 9, a refrigeration compressor, a 20, a gas-liquid separator, a 21, a gear pump, a 22, a tenth electromagnetic valve, a 23, an eleventh electromagnetic valve, a 24, a twelfth electromagnetic valve, a 25, a first ball float valve, a 26, a thirteenth, a 27, a fourteenth electromagnetic valve, a 28, a heat exchange coil, a 29, an oil-gas inlet.
Detailed Description
The following detailed description of the embodiments of the present invention will be described in conjunction with the accompanying drawings, which are included for the purpose of illustration only and are not to be construed as limiting the invention, and in order to better illustrate the following embodiments, some components of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The connection described in the following embodiments refers to connection through a pipeline, and a refrigerant is arranged in the condenser 18;
as shown in fig. 1, an oil gas condensing unit with self-defrosting function and an oil gas condensing and recovering method are provided, wherein the oil gas condensing unit comprises an oil gas compressor 1, an oil condensing chamber/defrosting chamber i 3, an oil condensing chamber/defrosting chamber ii 8, a liquid storage tank 17, a condenser 18, a refrigeration compressor 19, a gas-liquid separator 20, a gear pump 21, an oil storage tank 31, an electromagnetic valve, an electronic expansion valve and a control unit electrically connected with the electromagnetic valve and the expansion valve; the oil-gas compressor 1 is respectively connected with the oil condensing chamber/defrosting chamber I3 and the oil condensing chamber/defrosting chamber II 8 through a first electromagnetic valve 2 and a second electromagnetic valve 4; the oil condensing chamber/defrosting chamber I3 is connected 8 with the oil condensing chamber/defrosting chamber II through a third electromagnetic valve 6, and a fifth electromagnetic valve 9 is arranged between the oil condensing chamber/defrosting chamber I3 and an oil gas outlet 30; the oil condensing chamber/defrosting chamber II 8 is connected with an oil gas outlet 30 through a sixth electromagnetic valve 10, heat exchange coil pipes 28 are arranged in the oil condensing chamber/defrosting chamber I3 and the oil condensing chamber/defrosting chamber II 8, and an oleophobic coating is arranged on the surface layers of the heat exchange coil pipes 28 and used for reducing the adsorption force of pipe walls on oil drops and promoting the oil drops to slide down; the top ends of the oil condensing chamber/defrosting chamber I3 and the oil condensing chamber/defrosting chamber II 8 are provided with nozzles 5, the nozzles 5 face downwards to correspond to the heat exchange coil 28, so that oil gas is sprayed out from the nozzles 5, and sprayed airflow flows downwards to pass over the surface of the heat exchange coil 28 and contact with a frost layer; a first oil outlet is formed in the bottom of the oil condensing chamber/defrosting chamber I3, a second oil outlet is formed in the bottom of the oil condensing chamber/defrosting chamber II, the first oil outlet and the second oil outlet are both communicated with an oil storage tank 31 arranged between the oil condensing chamber/defrosting chamber I3 and the oil condensing chamber/defrosting chamber II 2, and a first ball float valve 25 and a second ball float valve 14 for monitoring the liquid level height in the oil storage tank 31 are respectively arranged at the first oil outlet and the second oil outlet; the liquid storage tank 17, the condenser 18, the refrigeration compressor 19 and the gas-liquid separator 20 are sequentially connected, and a refrigerant outlet of the liquid storage tank 17 is respectively connected with the oil condensation chamber/defrosting chamber II 8 and the oil condensation chamber/defrosting chamber I3 through an eighth electromagnetic valve 13 and a ninth electromagnetic valve 16; the gear pump 21 is arranged between the liquid storage tank 17 and the oil condensation chamber/defrosting chamber I3 and the oil condensation chamber/defrosting chamber II 8, the inlet of the gear pump 21 is connected with the liquid outlet at the bottom of the liquid storage tank 17, and the outlet of the gear pump 21 is respectively connected with the oil condensation chamber/defrosting chamber II 8 and the oil condensation chamber/defrosting chamber I3 through a tenth electromagnetic valve 22 and an eleventh electromagnetic valve 23; the gas-liquid separator 20 is respectively connected with the oil condensing chamber/defrosting chamber I3 and the oil condensing chamber/defrosting chamber II 8 through a thirteenth electromagnetic valve 26 and a fourteenth electromagnetic valve 27; a fourth electromagnetic valve 7 is arranged between the first electromagnetic valve 2 and the sixth electromagnetic valve 10 and is connected in series; a seventh electromagnetic valve 11 is arranged between the oil condensation chamber/defrosting chamber II 8 and the liquid inlet of the liquid storage tank 17, a twelfth electromagnetic valve 24 is arranged between the oil condensation chamber/defrosting chamber I3 and the liquid inlet of the liquid storage tank 17, and the seventh electromagnetic valve 11 and the twelfth electromagnetic valve 24 are used for switching refrigerants and adjusting flow paths; the electronic expansion valve comprises a first electronic expansion valve 15 and a second electronic expansion valve 12, the first electronic expansion valve 15 is arranged between a ninth electromagnetic valve 16 and the oil condensation chamber/defrosting chamber I3, and the second electronic expansion valve 12 is arranged between an eighth electromagnetic valve 13 and the oil condensation chamber/defrosting chamber II 8.
The oil gas condensation recovery method adopts an internal and external combined defrosting mode of liquid pipe defrosting and hot gas defrosting, wherein the liquid pipe defrosting is implemented by utilizing refrigerant liquid in the liquid storage tank 17, the hot gas defrosting can quickly melt a frost layer on the surface of the heat exchange coil 28, refrigerant liquid is arranged in the pipe of the heat exchange coil of the oil condensation chamber/defrosting chamber I3 and the oil condensation chamber/defrosting chamber II 8, oil gas is arranged outside the pipe, and when the oil gas condensation recovery method works, the oil condensation chamber/defrosting chamber I3 and the oil condensation chamber/defrosting chamber II 8 alternately work, and the method specifically comprises the following processes:
a: when the oil condensation chamber/defrosting chamber I3 is used as a defrosting chamber and the oil condensation chamber/defrosting chamber II 8 is used as an oil condensation chamber, the first electromagnetic valve 2, the third electromagnetic valve 6 and the sixth electromagnetic valve 10 of the oil-gas loop are opened through the control unit, while the eighth solenoid valve 13, the eleventh solenoid valve 23, the twelfth solenoid valve 24, the fourteenth solenoid valve 27 of the refrigerant circuit are opened by the control unit, the other electromagnetic valves are turned off, oil gas enters the oil-gas compressor 1 from the oil-gas inlet 29, the pressure and the temperature of the oil gas are increased after the oil gas is compressed by the oil-gas compressor 1, then the oil gas enters the oil condensing chamber/defrosting chamber I3, the oil gas pressurization is used for improving the air flow speed, the temperature of the pressurized oil gas is increased, the melting of a frost layer can be accelerated, the frost layer melting generates phase change heat absorption, the temperature rise of the oil gas is offset, and the load of subsequent oil gas condensation is reduced; the pressurized oil gas is sprayed out from a nozzle 5 at the top end of an oil condensing chamber/defrosting chamber I3, the sprayed air flow flows downwards to sweep over the surface of a heat exchange coil 28 and contact with a frost layer, the temperature of the frost layer is increased after being heated by the oil gas, the temperature of the oil gas is reduced after being cooled by a low-temperature frost layer, meanwhile, refrigerant liquid flows out from the lower part of a liquid storage tank 17 and enters the heat exchange coil 28 of the oil condensing chamber/defrosting chamber I3 under the driving of a gear pump 21, the frost layer on the surface of the heat exchange coil 28 is rapidly melted under the heating action of internal refrigerant liquid and oil gas flow outside the pipe, the frost layer is attached to the surface of the heat exchange coil 28 after being melted into small liquid drops, and the small liquid drops are driven by the oil gas flow to be converged into large liquid drops and drop from the surface of the heat exchange coil 28 to be stored at the bottom;
b: after flowing through the eighth solenoid valve 13 and the second electronic expansion valve 12, the refrigerant liquid in the liquid storage tank 17 becomes a low-temperature and low-pressure state through the throttling action of the second electronic expansion valve 12, enters the heat exchange coil 28 of the oil condensation chamber/defrosting chamber II 8, absorbs the heat of oil gas and is vaporized into refrigerant steam, the refrigerant steam is not completely vaporized and carries part of liquid, the refrigerant mixture comes out of the heat exchange coil 28, enters the gas-liquid separator 20 through the fourteenth solenoid valve 27 and is separated into refrigerant steam, then enters the refrigeration compressor 19, is pressurized into high-temperature and high-pressure steam through the refrigeration compressor 19, enters the condenser 18 and is cooled by a refrigerant, and the refrigerant liquid condensed into high-pressure and normal-temperature flows into the liquid storage tank 17; the residual oil gas in the oil condensing chamber/defrosting chamber I3 enters an oil condensing chamber/defrosting chamber II 8 through a third electromagnetic valve 6, passes through the surface of a heat exchange coil 28 from a nozzle 5 at the top end of the oil condensing chamber/defrosting chamber II 8 from top to bottom, exchanges heat with a low-temperature refrigerant in the heat exchange coil 28, is condensed into oil drops on the surface of the heat exchange coil 28, is driven by airflow to drop at the bottom of the oil condensing chamber/defrosting chamber II 8, and is discharged from an oil gas outlet 30 after passing through a sixth electromagnetic valve 10; when the level of the condensed oil at the bottoms of the oil condensing chamber/defrosting chamber I3 and the oil condensing chamber/defrosting chamber II 8 rises to a certain height, the first ball float valve 25 and the second ball float valve 14 at the oil outlets of the oil condensing chamber/defrosting chamber I3 and the oil condensing chamber/defrosting chamber II 8 are opened, and the condensed oil is discharged into the oil storage tank 31;
c: the working modes of the oil condensation chamber/defrosting chamber I3 and the oil condensation chamber/defrosting chamber II 8 are changed, the oil condensation chamber/defrosting chamber I3 is used as the oil condensation chamber, the oil condensation chamber/defrosting chamber II 8 is used as the defrosting chamber, and the second electromagnetic valve 4, the fourth electromagnetic valve 7 and the fifth electromagnetic valve 9 of the oil-gas loop are opened through the control unit; the seventh electromagnetic valve 11, the ninth electromagnetic valve 16, the tenth electromagnetic valve 22 and the thirteenth electromagnetic valve 26 of the refrigerant circuit are opened through the control unit, the rest electromagnetic valves are closed, the work flows of the oil-gas circuit and the refrigerant circuit are the same as the situations of a and b, and the description is omitted here, the continuous operation of the oil-gas condensation recovery system can be realized through the mode that the oil condensation chamber/defrosting chamber I3 and the oil condensation chamber/defrosting chamber II 8 work alternately, and the automation control degree of the system is high.
The invention is not limited to the details of the prior art, and it should be understood that the above-described embodiments of the invention are only examples for clearly illustrating the technical solutions of the invention, and are not intended to limit the specific embodiments of the invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention claims should be included in the protection scope of the present invention claims.
Claims (9)
1. The utility model provides an oil gas condensing unit with from defrosting function which characterized by: the oil gas condensing unit comprises an oil gas compressor (1), an oil condensing chamber/defrosting chamber I (3), an oil condensing chamber/defrosting chamber II (8), a liquid storage tank (17), a condenser (18), a refrigerating compressor (19), a gas-liquid separator (20), a gear pump (21), an oil storage tank (31), an electromagnetic valve, an electronic expansion valve and a control unit electrically connected with the electromagnetic valve and the expansion valve; the oil-gas compressor (1) is respectively connected with the oil condensing chamber/defrosting chamber I (3) and the oil condensing chamber/defrosting chamber II (8) through a first electromagnetic valve (2) and a second electromagnetic valve (4); the oil condensing chamber/defrosting chamber I (3) is connected with the oil condensing chamber/defrosting chamber II (8) through a third electromagnetic valve (6), and a fifth electromagnetic valve (9) is arranged between the oil condensing chamber/defrosting chamber I (3) and the oil gas outlet (30); the oil condensing chamber/defrosting chamber II (8) is connected with an oil gas outlet (30) through a sixth electromagnetic valve (10); the liquid storage tank (17), the condenser (18), the refrigeration compressor (19) and the gas-liquid separator (20) are sequentially connected, and a refrigerant outlet of the liquid storage tank (17) is respectively connected with the oil condensation chamber/defrosting chamber II (8) and the oil condensation chamber/defrosting chamber I (3) through an eighth electromagnetic valve (13) and a ninth electromagnetic valve (16); the gear pump (21) is arranged between the liquid storage tank (17) and the oil condensation chamber/defrosting chamber I (3) and the oil condensation chamber/defrosting chamber II (8), an inlet of the gear pump (21) is connected with a liquid outlet at the bottom of the liquid storage tank (17), and an outlet of the gear pump (21) is connected with the oil condensation chamber/defrosting chamber II (8) and the oil condensation chamber/defrosting chamber I (3) through a tenth electromagnetic valve (22) and an eleventh electromagnetic valve (23) respectively; the gas-liquid separator (20) is respectively connected with the oil condensing chamber/defrosting chamber I (3) and the oil condensing chamber/defrosting chamber II (8) through a thirteenth electromagnetic valve (26) and a fourteenth electromagnetic valve (27); the oil storage tank (31) is arranged between the oil condensation chamber/defrosting chamber I (3) and the oil condensation chamber/defrosting chamber II (8).
2. The oil gas condensing unit with the self-defrosting function as claimed in claim 1, which is characterized in that: and heat exchange coil pipes (28) are arranged in the oil condensing chamber/defrosting chamber I (3) and the oil condensing chamber/defrosting chamber II (8), nozzles (5) are arranged at the top ends of the oil condensing chamber/defrosting chamber I (3) and the oil condensing chamber/defrosting chamber II (8), and the nozzles (5) face downwards to correspond to the heat exchange coil pipes (28).
3. The oil gas condensing unit with the self-defrosting function as claimed in claim 2, wherein: the surface layer of the heat exchange coil (28) is provided with an oleophobic coating for reducing the adsorption force of the tube wall to oil drops and promoting the oil drops to slide.
4. The oil gas condensing unit with the self-defrosting function as claimed in claim 1, which is characterized in that: the bottom of the oil condensing chamber/defrosting chamber I (3) is provided with a first oil outlet, the bottom of the oil condensing chamber/defrosting chamber II (8) is provided with a second oil outlet, and the first oil outlet and the second oil outlet are communicated with an oil storage tank (31).
5. The oil and gas condensing unit with the self-defrosting function as claimed in claim 4, wherein: the first oil outlet and the second oil outlet are respectively provided with a first ball float valve (25) and a second ball float valve (14) which are used for controlling the liquid level of the bottom of the oil storage tank (31).
6. The oil gas condensing unit with the self-defrosting function as claimed in claim 1, which is characterized in that: a seventh electromagnetic valve (11) for switching refrigerants and adjusting flow paths is arranged between the oil condensation chamber/defrosting chamber II (8) and the liquid storage tank (17), and a twelfth electromagnetic valve (24) for switching refrigerants and adjusting flow paths is arranged between the oil condensation chamber/defrosting chamber I (3) and the liquid storage tank (17).
7. The oil gas condensing unit with the self-defrosting function as claimed in claim 1, which is characterized in that: a fourth electromagnetic valve (7) is arranged between the first electromagnetic valve (2) and the sixth electromagnetic valve (10), and the first electromagnetic valve, the second electromagnetic valve and the sixth electromagnetic valve are connected in series.
8. The oil gas condensing unit with the self-defrosting function as claimed in claim 1, which is characterized in that: the electronic expansion valve comprises a first electronic expansion valve (15) and a second electronic expansion valve (12), the first electronic expansion valve (15) is arranged between a ninth electromagnetic valve (16) and the oil condensing chamber/defrosting chamber I (3), and the second electronic expansion valve (12) is arranged between an eighth electromagnetic valve (13) and the oil condensing chamber/defrosting chamber II (8).
9. An oil gas condensation recovery method of an oil gas condensing unit with self-defrosting function according to any one of claims 1 to 8, which is characterized by comprising the following steps: the oil gas condensation recovery method adopts an inner and outer combined defrosting mode of liquid pipe defrosting and hot gas defrosting, the liquid pipe defrosting is to utilize refrigerant liquid in the liquid storage tank (17) to defrost, the hot gas defrosting can quickly melt a frost layer on the surface of the heat exchange coil (28), and meanwhile, two oil condensation chambers/defrosting chambers are utilized to alternately work, so that the continuous operation of oil gas condensation recovery is realized, and the method specifically comprises the following processes:
a: when the oil condensation chamber/defrosting chamber I (3) is used as a defrosting chamber, and the oil condensation chamber/defrosting chamber II (8) is used as an oil condensation chamber, the first electromagnetic valve (2), the third electromagnetic valve (6) and the sixth electromagnetic valve (10) of the oil-gas loop are opened through the control unit, meanwhile, the eighth electromagnetic valve (13), the eleventh electromagnetic valve (23), the twelfth electromagnetic valve (24) and the fourteenth electromagnetic valve (27) of the refrigerant loop are opened through the control unit, the rest electromagnetic valves are closed, oil gas enters the oil-gas compressor (1) from the oil-gas inlet (29), after being compressed by the oil-gas compressor (1), the pressure and the temperature of the oil gas rise and then enter the oil condensation chamber/defrosting chamber I (3), the pressurized oil gas is sprayed out from a nozzle (5) at the top end of the oil condensation chamber/defrosting chamber I (1), the sprayed air flow downwards to sweep over the surface of the heat exchange coil (28) and contact with a frost layer, the temperature of a frost layer is increased after the frost layer is heated by oil gas, the melting of the frost layer is accelerated, the temperature of oil gas is reduced after the oil gas is cooled by a low-temperature frost layer, meanwhile, refrigerant liquid flows out of the lower part of the liquid storage tank (17), the refrigerant liquid is driven by the gear pump (21) to enter the heat exchange coil (28) of the oil condensation chamber/defrosting chamber I (3), the frost layer on the surface of the heat exchange coil (28) is rapidly melted under the heating action of the internal refrigerant liquid and oil gas flow outside the pipe, the frost layer is melted into small liquid drops which are attached to the surface of the heat exchange coil (28), and the small liquid drops are converged into large liquid drops under the driving of the oil gas flow and then drop from the surface of the heat exchange coil (28) and are accumulated at the bottom of the oil condensation;
b: refrigerant liquid in the liquid storage tank (17) flows through an eighth electromagnetic valve (13) and a second electronic expansion valve (12), then is changed into a low-temperature and low-pressure state through the throttling action of the second electronic expansion valve (12), enters a heat exchange coil (28) of an oil condensation chamber/defrosting chamber II (8), is vaporized after absorbing oil gas heat, and carries partial liquid after incomplete vaporization, enters a gas-liquid separator (20) through a fourteenth electromagnetic valve (27) and is separated to obtain refrigerant vapor, the refrigerant vapor returns to a refrigeration compressor (19), is pressurized into high-temperature and high-pressure vapor through the refrigeration compressor (19), enters a condenser (18) and is cooled by a refrigerant, and the refrigerant liquid condensed into high-pressure and normal-temperature liquid flows into the liquid storage tank (17); residual oil gas in the oil condensing chamber/defrosting chamber I (3) enters an oil condensing chamber/defrosting chamber II (8) through a third electromagnetic valve (6), the oil gas is swept across the surface of a heat exchange coil (28) from top to bottom through a nozzle (5) at the top end of the oil condensing chamber/defrosting chamber II (8) to exchange heat with a low-temperature refrigerant in the heat exchange coil (28), the oil gas is condensed into oil drops on the surface of the heat exchange coil (28), and the oil drops on the bottom of the oil condensing chamber/defrosting chamber II (8) under the driving of air flow; when the level of the condensed oil at the bottoms of the oil condensing chamber/defrosting chamber I (3) and the oil condensing chamber/defrosting chamber II (8) rises to a certain height, the first ball float valve (25) and the second ball float valve (24) are opened, and the condensed oil is discharged into the oil storage tank (31); the non-condensable gas in the oil condensation chamber/defrosting chamber II (2) passes through a sixth electromagnetic valve (10) and then is discharged from an oil gas outlet (30);
c: after the oil condensation chamber/defrosting chamber I (3) defrosts, the working modes of the oil condensation chamber/defrosting chamber I (3) and the oil condensation chamber/defrosting chamber II (8) are changed, namely the oil condensation chamber/defrosting chamber I (3) is an oil condensation chamber, the oil condensation chamber/defrosting chamber II (8) is a defrosting chamber, and in the working mode, a second electromagnetic valve (4), a fourth electromagnetic valve (7) and a fifth electromagnetic valve (9) of an oil-gas loop are opened; and a seventh electromagnetic valve (11), a ninth electromagnetic valve (16), a tenth electromagnetic valve (22) and a thirteenth electromagnetic valve (26) of the refrigerant circuit are opened, the other electromagnetic valves are closed, and the working processes of the oil-gas circuit and the refrigerant circuit are the same as the conditions of the above a and b, and are not described again.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010764729.1A CN111744228A (en) | 2020-08-03 | 2020-08-03 | Oil gas condensing unit with self-defrosting function and oil gas condensing and recycling method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010764729.1A CN111744228A (en) | 2020-08-03 | 2020-08-03 | Oil gas condensing unit with self-defrosting function and oil gas condensing and recycling method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112870752A (en) * | 2021-01-20 | 2021-06-01 | 广东申菱环境系统股份有限公司 | Cold-carrying type oil gas recovery device |
| CN113683136A (en) * | 2021-09-02 | 2021-11-23 | 上海泓济环保科技股份有限公司 | Heat exchange solidification separation switchable regeneration organic wastewater separation device and use method thereof |
| CN114470848A (en) * | 2022-01-24 | 2022-05-13 | 广东申菱环境系统股份有限公司 | Condensed oil gas recovery system and defrosting method |
-
2020
- 2020-08-03 CN CN202010764729.1A patent/CN111744228A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112870752A (en) * | 2021-01-20 | 2021-06-01 | 广东申菱环境系统股份有限公司 | Cold-carrying type oil gas recovery device |
| CN113683136A (en) * | 2021-09-02 | 2021-11-23 | 上海泓济环保科技股份有限公司 | Heat exchange solidification separation switchable regeneration organic wastewater separation device and use method thereof |
| CN114470848A (en) * | 2022-01-24 | 2022-05-13 | 广东申菱环境系统股份有限公司 | Condensed oil gas recovery system and defrosting method |
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