KR20150062683A - Control method of the high efficiency oil refining device using the two heat pump equipment - Google Patents

Abstract

The present invention relates to a method for controlling a high efficiency oil purifying device by using a two-stage heat pump device. More specifically, the oil purifying device comprises: a heat exchange system for collecting condensed heat of waste heat; a grading system for collecting oil at low temperature equal pressure; and a two-stage heat pump system having a flow path changing system and a cascade heat exchanger applied thereto.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a control method of a high-efficiency oil refining apparatus using a two-stage heat pump apparatus,

More particularly, the present invention relates to a heat exchange system for recovering the heat of condensation of waste heat, a pressure equalization system for recovering oil in a low temperature plumbing, The present invention relates to a control method for a highly efficient oil purifier using a two-stage heat pump apparatus including a two-stage heat pump system applied with a cold heat exchanger.

Generally, oils used widely in various machine tools, hydraulic machines, automobile engines, general industry, etc. promote the breakdown and aging of machines due to mixing of water, mixing of particulate pollutants, and the like.

Moisture in oil is the most commonly occurring contaminant in lubricating systems and has a wide variety of effects, including corrosion, loss of lubricating properties, fluid damage, additive trapping, reduced dielectric strength, wear of hydraulic products, and oxidation of oil. In addition, particulate contaminants in oil cause friction, temperature and pressure rise of lubricating part due to increase of abrasion of machine and destruction of oil film formed on the inner surface due to friction between inner surface and particle, resulting in serious damage to machinery It is also said.

Therefore, in order to increase the service life of the machine and to maintain the normal operating condition, the oil in use should be changed periodically according to the degree of contamination, and a large amount of waste oil generated at this time is a main cause of environmental pollution.

The waste oil purifying apparatus for removing water and contaminants mixed with oil is mainly focused on the removal of particulate pollutants. The applied techniques are mainly centrifugal force type and cartridge type oil filter Most of them are centrifugal type, but they are low-level technology with high removal efficiency.

In addition, a method of reducing the pressure of the waste oil by heating / spraying is adopted as the most recent technology among the existing technologies for removing moisture in the waste oil. However, the shape of the spray nozzle, the operation stability of the apparatus, It is necessary to use the simple decompression evaporation without consideration of processability and the like. This is because when the operating characteristic of the apparatus, the processing capacity per unit time, the performance change by the type of the waste oil is large, It has a problem of greatly reducing it.

Although the above-mentioned techniques have been applied solely or in combination to purify waste oil, it is impossible to remove particulate contaminants of about 5 microns or less, and it is difficult to remove fluid contaminants such as moisture, resinous substances, and oxides, Particularly, it is not easy to completely remove fine particles of 1 micron or less and dissolved water.

Thus, the " Waste Lubricating Oil Purifier and Method "of Patent Registration No. 407159 was developed and disclosed. However, in the patent, the water is removed while maintaining the degree of vacuum of the primary vacuum chamber at a high vacuum by using the primary vacuum chamber and the secondary auxiliary vacuum chamber (exhaust chamber) to remove the moisture in the oil, The function is only for maintaining the high vacuum state of the primary vacuum chamber and can not remove water or remove contaminating particles and the oil refining time is lengthened by the time the oil stays in the secondary auxiliary vacuum chamber, In addition to the complexity of the work process due to the increase in the facility, the trap filter in the electrostatic separator absorbs moisture when the waste oil containing a large amount of water is introduced into the electrostatic separator. The voltage is abruptly dropped by the trapping filter that absorbs moisture, the current rises, and the electrostatic ionic capacity due to the high voltage is lost, so that the contaminant particles can not be removed.

In addition, the trapping filter once absorbing moisture has a problem in that the water absorbed by the trapping filter can not be quickly released even after a long time of operation, so that the pollutant removing ability is remarkably deteriorated.

Korean Patent Publication No. 10-0586459 Korean Patent Publication No. 10-407159 Korean Patent Publication No. 10-2001-0045080

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art,

By using the heat pump unit as the two-stage heating, the energy can be saved by more than 1/4 compared with the conventional electric heat, the cooling function can be given to the purified oil, and the low temperature evaporation method is applied through the vacuum pump The present invention provides a control method of a highly efficient oil purifier using a two-stage heat pump apparatus capable of reducing the risk of oil deterioration and fire, and recovering pure oil from waste oil through a low-pressure diaphragm.

In order to achieve the above object, the present invention provides a method of operating a refrigerator, comprising: (S100) a step of filtering waste oil stored in an oil storage tank by a filter;

Heating the filtered oil by operation of the first heat pump device to evaporate moisture in the oil (S200);

The heated oil flows into the oil flushing tank, and the water vapor in the oil is separated and primarily flushed by the porous medium device (S300);

(S400) wherein the oil separated from the oil flushing tank is delivered to the cascade heat exchanger according to the set condition, exchanged with the first heat pump device through the cascade heat exchanger, and then transferred to the oil recovery tank;

The oil stored in the oil recovery tank is transferred to the cascade heat exchanger according to the set temperature condition, exchanged with the second heat pump device through the cascade heat exchanger, and then transmitted to the oil recovery tank again (S500);

The water vapor separated from the oil flushing tank is transferred to the waste heat recovering heat exchanger by a vacuum pump and is heat-exchanged with the oil in the oil recovery tank through the waste heat recovering heat exchanger (S600);

A step S700 of discharging the oil stored in the oil recovery tank to the outside through the drain pipe according to the setting condition;

The present invention relates to a control method for a highly efficient oil purifier using a two-stage heat pump apparatus.

As described above, the control method of the high-efficiency oil purifier using the two-stage heat pump apparatus of the present invention is a method in which the oil is heated by using the heat pump apparatus as the two- It is possible to apply cooling function to cleaned oil. By applying low temperature evaporation method through vacuum pump, it is possible to reduce the risk of oil deterioration and fire, and it is possible to recover pure oil from waste oil through low pressure .

1 is a schematic view showing a high-efficiency oil purifier using a two-stage heat pump apparatus according to an embodiment of the present invention,
2 is a flowchart illustrating a method of controlling a high efficiency oil purifier using a two-stage heat pump apparatus according to an embodiment of the present invention.

The present invention has the following features in order to achieve the above object.

The present invention is characterized in that the step (S100) in which the waste oil stored in the oil storage tank is filtered by the filtration filter;

Heating the filtered oil by operation of the first heat pump device to evaporate moisture in the oil (S200);

The heated oil flows into the oil flushing tank, and the water vapor in the oil is separated and primarily flushed by the porous medium device (S300);

(S400) wherein the oil separated from the oil flushing tank is delivered to the cascade heat exchanger according to the set condition, exchanged with the first heat pump device through the cascade heat exchanger, and then transferred to the oil recovery tank;

The oil stored in the oil recovery tank is transferred to the cascade heat exchanger according to the set temperature condition, exchanged with the second heat pump device through the cascade heat exchanger, and then transmitted to the oil recovery tank again (S500);

The water vapor separated from the oil flushing tank is transferred to the waste heat recovering heat exchanger by a vacuum pump and is heat-exchanged with the oil in the oil recovery tank through the waste heat recovering heat exchanger (S600);

And a step S700 of discharging the oil stored in the oil recovery tank to the outside through the drain pipe according to the set condition.

The present invention having such characteristics can be more clearly described by the preferred embodiments thereof.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Before describing in detail several embodiments of the present invention with reference to the accompanying drawings, it is to be understood that the present invention is not limited to the details of construction and the arrangement of components shown in the following detailed description or illustrated in the drawings will be. The invention may be embodied and carried out in other embodiments and carried out in various ways. It should also be noted that the device or element orientation (e.g., "front," "back," "up," "down," "top," "bottom, Expressions and predicates used herein for terms such as "left," " right, "" lateral, " and the like are used merely to simplify the description of the present invention, Or that the element has to have a particular orientation. Also, terms such as " first "and" second "are used herein for the purpose of the description and the appended claims, and are not intended to indicate or imply their relative importance or purpose.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

FIG. 1 is a schematic view showing a high efficiency oil purifier using a two-stage heat pump apparatus according to an embodiment of the present invention. FIG. 2 is a schematic view showing a control method of a high efficiency oil purifier using a two-stage heat pump apparatus according to an embodiment of the present invention Fig.

As shown in FIGS. 1 and 2, the method for controlling a high efficiency oil purifier using the two-stage heat pump apparatus of the present invention simultaneously removes contaminants in the waste oil stored in the oil storage tank 1 and moisture contained in the oil As shown in FIG. 1, the high-efficiency oil purifier using the two-stage heat pump apparatus includes a filtration filter 10 (flushing system) The first heat pump device 20, the oil flushing tank 40, the oil recovery tank 50, the second heat pump device 30, the cascade heat exchanger 60, And a pipe (70).

As shown in FIG. 1, the filtration filter 10 is connected to the oil storage tank 1 through a pipe to filter solid contaminants contained in the oil transferred in the oil storage tank 1.

At the outlet of the filtration filter 10, a flow control valve 11 for regulating the amount of oil filtered by the filtration filter 10 is formed.

1, the first heat pump device 20 includes a compressor 21 for converting a refrigerant into a high temperature and a high pressure, a first heat exchanger 21 for heat-exchanging refrigerant of high temperature and high pressure of the compressor 21, (22), an expansion valve (23) for expanding refrigerant heat-exchanged in the first heat exchanger (22), and a heat exchanger for exchanging the refrigerant expanded in the expansion valve (23) with the heat exchanged in the cascade heat exchanger , And a gas-liquid separator (24) for separating oil in the refrigerant.

Here, the oil heat-exchanged by the first heat exchanger (22) of the first heat pump device (20) is heated to about 60 DEG C, and the oil is heated to a high temperature while moisture contained therein is converted into steam To the oil flushing tank (40). At this time, the heat-exchanged oil is transferred into the oil flushing tank 40 through a pipe, and the pipe further has a temperature sensor T1 for measuring the temperature of the oil transferred to the inside thereof.

As shown in FIG. 1, the second heat pump device 30 includes a compressor 31 for converting a refrigerant into a high temperature and a high pressure, and a second heat pump device 30 connected to the outlet side of the compressor 31, A high pressure refrigerant of high pressure and high pressure of the compressor 31 is delivered to the cascade heat exchanger 60 and a refrigerant which is heat exchanged in the cascade heat exchanger 60 is expanded A second heat exchanger (34) for exchanging heat between the refrigerant expanded in the expansion valve (33) and the outside air to evaporate the refrigerant, and a second heat exchanger (34) And a gas-liquid separator (35) for separating the gas-liquid separator (35).

Here, the second heat pump device 30 may heat or cool the oil in the oil recovery tank 50. [

1, the oil heated in the first heat pump unit 20 flows into the tank 40, and the porous medium unit 41 is accommodated in the tank 40. In the oil flushing tank 40, And the introduced oil passes through the porous medium device 41, so that the water vapor in the oil is separated. The separated oil is stored in the lower end of the tank 40 and the water vapor is delivered to the waste heat recovery heat exchanger 51 of the oil recovery tank 50 through the steam transfer pipe 80 connected to the porous medium device 41 do.

A level sensor 42 is further provided in the oil flushing tank 40 to sense the amount of oil stored in the oil flushing tank 40. The solenoid valves 71, 72, an oil pump 74, and the like are operated. At this time, the level sensor 42 is a bar-shaped sensor, and a plurality of sensor bars are formed to have different lengths, and a length is formed in accordance with the highest and lowest levels of the oil to detect the level of the oil.

The oil flushing tank 40 is further maintained at a pressure of 100 torr (10 kPa). The oil return tank 50 is provided with a pressure sensor 43 for measuring the pressure in the oil flushing tank 40. ) Is maintained at the same pressure, which is maintained by the water-sealed vacuum pump 81 which transports the water vapor.

1, the oil taken from the oil flushing tank 40 is heat-exchanged in the cascade heat exchanger 60 and is then stored in the oil return tank 50. In the oil return tank 50, A level sensor 52 is installed inside the sensor 50 to sense the amount of oil stored therein and drains the oil to the outside according to the amount of oil detected by the level sensor 52. In this case, the oil recovery tank 50 is further provided with a pressure sensor 53 for measuring the pressure in the tank 50. In the oil recovery tank 50, a temperature sensor (T2) is further provided.

Here, a drain pipe is provided at the lower end of the oil recovery tank 50, and pure oil in the oil recovery tank 50 is discharged to the outside through the drain pipe. A check valve and an oil pump are installed in the drain pipe do.

1, a waste heat recovery heat exchanger 51 for separating heat from the oil stored in the oil flushing tank 40 and transferred by the vacuum pump 81 and the oil stored therein is installed in the oil recovery tank 50 do. At this time, the waste heat recovery heat exchanger (51) is in the form of a coil, and the oil in the oil recovery tank (50) is once heated by the high temperature (about 60 DEG C) 51), that is, the converted condensed water, is drained to the outside through a drain pipe communicated with the outside.

The steam transfer pipe 80 is connected to the upper end of the oil flushing tank 40 so that water vapor is introduced into the waste heat recovery heat exchanger 51. The water vapor transfer pipe 80 is connected to the waste heat recovery heat exchanger 51 And a water pump type vacuum pump 81 is further installed at one end of the steam transfer pipe 80 so as to maintain the pressure of the water vapor, the oil flushing tank 40 and the oil recovery tank 50 at a pressure of 100 torr.

Here, the oil in the oil recovery tank 50 is heated through the waste heat recovery heat exchanger 51 to separate water vapor, and the water vapor is mixed with water vapor transferred from the oil flushing tank 40 by the vacuum pump 81 (Not shown) is formed at the upper end of the oil recovery tank 50 so that the oil is returned to the waste heat recovery heat exchanger 51. The steam branch pipe is connected to the oil flushing tank 40 and the waste heat recovery heat exchanger 51, The pressure inside the oil flushing tank 40 and the oil returning tank 50 can be maintained by the water-sealed vacuum pump 81 by communicating with the water vapor transfer pipe 80 connecting between the oil flushing tank 40 and the oil returning tank 80.

As shown in FIG. 1, the cascade heat exchanger 60 is heat-exchanged for the evaporator of the first heat pump device 20 according to the setting condition, or is heat-exchanged for the condenser of the second heat pump device 30, Or the oil in the oil flushing tank 40 or the oil recovery tank 50 is transferred to heat exchange. Hereinafter, the role of the cascade heat exchanger 60 will be described in detail in connection with the transfer pipe 70.

The cascade heat exchanger 60 is a plate type heat exchanger, and has three inlet ports and three outlet ports on one end face, and the first heat pump device 20, the second heat pump device 30, (70).

1, the oil in the oil flushing tank 40 or the oil recovery tank 50 is supplied to the cascade heat exchanger 60 in accordance with the set conditions, And is communicated with the lower end portion of the oil recovery tank 50 so that the oil heat-exchanged in the cascade heat exchanger 60 is transferred into the oil recovery tank 50.

1, one side of the transfer pipe 70 is connected to the cascade heat exchanger 60 to transfer the oil by the oil pump 74, and the other side of the transfer pipe 70 is connected to the oil flushing tank 40, (50). That is, the pipe formed by the transfer pipe 70 in the shape of "T" communicates with the oil flushing tank 40 and the lower end of the oil recovery tank 50, respectively, and the transfer pipe 70, Idle heat exchanger (60).

1, the first and second solenoid valves 71 and 72 are respectively installed in the branched transfer pipe 70, and the transfer between the first and second solenoid valves 71 and 72 and the tank Each pipe 70 is provided with a check valve 73 to prevent the oil from flowing backward.

The first and second solenoid valves 71 and 72 are installed in the transfer pipe 70 so that the oil in the oil flushing tank 40 or the oil recovery tank 50 is discharged to the cascade heat exchanger 60, and the heat-exchanged oil in the cascade heat exchanger (60) is transferred into the oil recovery tank (50).

Hereinafter, a control method for the highly efficient oil purifier using the two-stage heat pump apparatus will be described with reference to the drawings.

1 and 2, a method of controlling a high-efficiency oil purifier using a two-stage heat pump apparatus according to the present invention is a method in which waste oil is stored in an oil storage tank 1, (S100). At this time, the amount of the oil to be transferred is controlled through the flow rate control valve 11. The flow rate control valve 11 controls the flow rate of the oil.

Then, the filtered oil is heated by the operation of the first heat pump device 20 to evaporate water in the oil (S200). That is, the oil and the oil in which water vapor is evaporated in the oil .

Then, the heated oil flows into the oil flushing tank 40. The introduced oil is separated from the oil vapor in the oil by the porous medium device 41 and is firstly flushed (S300). At this time, The oil separated from the porous medium device 41 is stored in the lower end portion of the oil flushing tank 40 and the water vapor separated from the porous medium device 41 is transported to the upper side in the oil flushing tank 40.

The oil separated from the oil flushing tank 40 is delivered to the cascade heat exchanger 60 in accordance with the set conditions and is supplied to the first heat pump device 20 through the cascade heat exchanger 60 Exchanged and then transferred to the oil recovery tank 50 (S400)

Here, when the amount of oil sensed by the level sensor 42 in the oil flushing tank 40 is high, the second solenoid valve 72 is shut off, the first solenoid valve 71 is opened and the oil flushing tank 40 is transferred to the cascade heat exchanger 60 through the transfer pipe 70 so that the heat source of the oil is transferred to the first heat pump device 20 through the cascade heat exchanger 60 Exchanged and then stored in the oil recovery tank 50 through the transfer pipe 70. At this time, in the cascade heat exchanger 60, the temperature of the oil is lowered to about 40 ° C by exchanging the high temperature of the oil (about 60 ° C) with the refrigerant of the first heat pump device 20.

When the amount of oil detected by the level sensor 42 in the oil flushing tank 40 is low, the first solenoid valve 71 is shut off and the second solenoid valve 72 is opened, 50 is transferred to the cascade heat exchanger 60 and the heat source of the oil is transferred through the cascade heat exchanger 60 to the first heat pump device 20, 70 and stored in the oil recovery tank 50 again. At this time, in the cascade heat exchanger 60, the temperature of the oil is lowered to about 20 ° C by exchanging the high temperature (about 40 ° C) of the oil with the refrigerant of the first heat pump device 20.

The oil stored in the oil recovery tank 50 is transferred to the cascade heat exchanger 60 in accordance with the set temperature condition and is supplied to the second heat pump device 30 through the cascade heat exchanger 60 Exchanged, and then transmitted to the oil recovery tank 50 again (S500).

Here, when the oil temperature measured by the temperature sensor T2 of the oil recovery tank 50 reaches 20 to 25 DEG C, the first solenoid valve 71 is shut off and the second solenoid valve 72 is opened The oil in the oil recovery tank 50 is transferred to the cascade heat exchanger 60 through the transfer pipe 70 and the cascade heat exchanger 60 is operated while the second heat pump device 30 is operated. The heat source of the second heat pump device 30 is heat-exchanged so as to be transferred to the oil, and is stored again in the oil recovery tank 50 through the transfer pipe. At this time, the oil stored in the oil recovery tank 50 is raised to a temperature of 35 to 40 ° C.

The water vapor separated from the oil flushing tank 40 is then transferred to the waste heat recovery heat exchanger 51 by the vacuum pump 81 installed in the water vapor transfer pipe 70, (S600). At this time, the water vapor in the oil generated in the secondary flushing flows through the upper portion of the oil recovery tank 50 to the water vapor And the water vapor is transferred to the waste heat recovery heat exchanger (51).

The oil in the oil recovery tank 50 is discharged to the outside through the high-surface drain pipe (S700). In this case, the oil in the oil recovery tank 50 is discharged through the waste heat recovery heat exchange Is purified once through the unit (51), and only the pure oil is discharged to the outside. In this way, the waste oil is purged with pure oil.

The set conditions of the oil stored in the oil recovery tank 50 are such that when the amount of oil sensed by the level sensor 52 in the oil recovery tank 50 is high and the first and second solenoid valves 71, And the oil in the oil recovery tank 50 is discharged by the oil pump to the designated place through the drain pipe.

10: Filtration filter 11: Flow control valve
20: first heat pump device 30: second heat pump device
40: Oil flushing tank 41: Porous medium device
42, 52: Level level sensor 43, 53: Pressure sensor
50: Oil recovery tank 51: Waste heat recovery heat exchanger
60: a cascade heat exchanger 70; Conveying pipe
71: first solenoid valve 72: second solenoid valve
73: Check valve 74: Oil pump
80: water vapor transmission pipe 81: water-pumped vacuum pump

Claims (4)

A step S100 in which the waste oil stored in the oil storage tank 1 is filtered by the filter 10;
Heating the filtered oil by operation of the first heat pump device 20 to evaporate moisture in the oil (S200);
The heated oil flows into the oil flushing tank 40, and the water vapor in the oil is separated and primarily flushed by the porous medium device 41 (S300);
The oil separated from the oil flushing tank 40 is delivered to the cascade heat exchanger 60 in accordance with the set conditions and the heat exchanged with the first heat pump device 20 through the cascade heat exchanger 60 (S400), which is then transmitted to the oil recovery tank (50);
The oil stored in the oil recovery tank 50 is transferred to the cascade heat exchanger 60 in accordance with the set temperature condition and the heat is exchanged with the second heat pump device 30 through the cascade heat exchanger 60 (S500), which is then transmitted back to the oil recovery tank 50;
The water vapor separated from the oil flushing tank 40 is transferred to the waste heat recovering heat exchanger 51 by the vacuum pump 81 and exchanged with the oil in the oil recovery tank 50 through the waste heat recovering heat exchanger 51 A second flushing step (S600);
A step S700 in which the oil stored in the oil recovery tank 50 is discharged to the outside through the drain pipe in accordance with the set conditions;
And a control unit for controlling the operation of the high-efficiency oil purifier.
The method according to claim 1,
The setting conditions under which the oil in the oil flushing tank 40 is transferred in step S400,
The second solenoid valve 72 is shut off and the first solenoid valve 71 is opened and the oil flushing tank 40 is opened when the amount of oil detected by the level sensor 42 in the oil flushing tank 40 is high. Is transferred to the cascade heat exchanger (60) through the transfer pipe (70), heat exchange is performed through the cascade heat exchanger (60) so that the heat source of the oil is transferred to the first heat pump device ,
When the amount of oil detected by the level sensor 42 in the oil flushing tank 40 is low, the first solenoid valve 71 is shut off and the second solenoid valve 72 is opened to open the oil recovery tank 50, Is transferred to the cascade heat exchanger (60) and the heat source of the oil is transferred through the cascade heat exchanger (60) to the first heat pump device (20) (EN) CONTROL METHOD FOR HIGH -
The method according to claim 1,
In the step S500, the set temperature condition at which the oil in the oil recovery tank 50 is delivered,
When the oil temperature measured by the temperature sensor T2 of the oil recovery tank 50 reaches 20 to 25 DEG C, the first solenoid valve 71 is shut off, the second solenoid valve 72 is opened, The oil in the tank 50 is transferred to the cascade heat exchanger 60 via the transfer pipe and heat is exchanged in the cascade heat exchanger 60 so that the heat source of the second heat pump device 30 is transferred to the oil And a control unit for controlling the high-efficiency oil purifier by using the two-stage heat pump apparatus.
The method according to claim 1,
The setting condition of the oil stored in the oil recovery tank 50 in step S700 is,
When the amount of oil detected by the level sensor 52 in the oil recovery tank 50 is high, the first and second solenoid valves 71 and 72 are shut off, And the oil is discharged to the drain pipe by the oil pump.

Images