KR20100056434A - The cooling system for lubricant oil of turbine bearing using refrigerant evaporation heat - Google Patents

The cooling system for lubricant oil of turbine bearing using refrigerant evaporation heat Download PDF

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Publication number
KR20100056434A
KR20100056434A KR1020100043256A KR20100043256A KR20100056434A KR 20100056434 A KR20100056434 A KR 20100056434A KR 1020100043256 A KR1020100043256 A KR 1020100043256A KR 20100043256 A KR20100043256 A KR 20100043256A KR 20100056434 A KR20100056434 A KR 20100056434A
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KR
South Korea
Prior art keywords
lubricating oil
condenser
refrigerant
lubricant
heat exchanger
Prior art date
Application number
KR1020100043256A
Other languages
Korean (ko)
Inventor
임재현
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임재현
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Publication date
Application filed by 임재현 filed Critical 임재현
Priority to KR1020100043256A priority Critical patent/KR20100056434A/en
Publication of KR20100056434A publication Critical patent/KR20100056434A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/08—Cooling; Heating; Heat-insulation
    • F01D25/12—Cooling
    • F01D25/125—Cooling of bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/16—Arrangement of bearings; Supporting or mounting bearings in casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/18—Lubricating arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
    • F01M5/002—Cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
    • F01M5/002—Cooling
    • F01M2005/004—Oil-cooled engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2220/00—Application
    • F05D2220/30—Application in turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/50—Bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/20—Heat transfer, e.g. cooling

Abstract

PURPOSE: A turbine bearing lubricant cooling system using evaporation heat of refrigerant is provided to cool lubricant for a turbine bearing with a natural circulation method. CONSTITUTION: A turbine bearing lubricant cooling system using evaporation heat of refrigerant comprises a lubricant tank(11), a lubricant heat exchanger(12), a condenser(51), a gas pipe(22), a liquid pipe(23) and a gas outlet. Lubricant for a turbine bearing is stored in the lubricant tank. The lubricant heat exchanger is installed higher than the lubricant heat exchanger outside the lubricant tank. The gas pipe passes through the lubricant heat exchanger and the upper outlet of the condenser. The liquid pipe passes through the lower outlet of the lubricant heat exchanger and the lower outlet of the condenser. A closed loop coolant circuit formed by the lubricant heat exchanger, the gas pipe, the condenser, and the liquid pipe, and made vacuum by coolant. The coolant can boil with the heat of the lubricant filled in the lubricant heat exchanger.

Description

The cooling system for lubricant oil of turbine bearing using refrigerant evaporation heat}

Turbine Bearing Cooling System

   The bearings are installed in the journal, the turbine bearing part, to allow the turbines to rotate and rotate at high speed so that they are in contact with each other. As the turbine rotates, frictional heat is generated between the bearing and the journal, which is absorbed by the lubricant. Heat absorbed lubricating oil is circulated to the lubricating oil tank. The lubricating oil tank filters foreign substances from the lubricating oil and cools the heat absorbing lubricating oil. In order to prevent the thickness of the oil film of the lubricant and the physical deformation of the bearings and journals, it is advisable to keep the temperature of the lubricant at about 70 ° C to 80 ° C. Therefore, the lubricating oil supplied to the turbine bearing is used to cool the lubricating oil by using an auxiliary cooling system, which is conventionally water-cooled, so as to maintain a temperature of about 40 ° C to 60 ° C. The cooling water used here is about 16 of the cooling water required for the entire generator. As much as%, there is a lot of energy use due to the continuous circulation of auxiliary coolant. Conventional inventions such as registration number 10-0557791 [lubrication and cooling system for nanolubricating oil and turbine rotor using the same] and publication No. 1983-0001492 [lubricating oil cooling device of steam turbine] are all water-cooling methods of forced circulation.

In the present invention, to suppress the use of energy due to the forced circulation of the auxiliary cooling water of the existing cooling system and to avoid the use of rotary devices such as pumps in order to preclude failure factors caused by the use of rotary devices in order to cool the turbine bearing lubricant low temperature The applicability of the natural circulation method using the heat of vaporization of refrigerant that can boil at It also reduces the amount of cooling water required by dumping heat into the air.

It is a method of cooling the lubricating oil by installing a refrigerant cooling circuit that can boil the lubricating oil that absorbs the heat of the turbine bearing lubricating oil tank by the heat of the lubricating oil. The condenser is sealed so that it is a closed circuit and filled with refrigerant. The refrigerant is boiled by the heat provided by the lubricating oil to cool the lubricating oil, and the vaporized refrigerant dissipates heat from the condenser, liquefies and flows back into the lubricating oil heat exchanger by gravity.

     The existing turbine bearing cooling system uses a forced circulation method of water cooling to use a lot of energy for circulation of the subcooled coolant and the coolant, and a pump is used for the subcooled coolant and the coolant to circulate the turbine. There was a problem that the same case occurs.

In the present invention, by using the waste heat to be removed from the lubricating oil, the refrigerant is vaporized and moved to the condenser, and the condensed liquid refrigerant is moved by gravity to not only use energy in the refrigerant circulation but also to avoid the cause of failure by not using a pump. Removed before. In addition, the air-cooled condenser is applied in consideration of the low time of the atmospheric temperature, thereby reducing the amount of cooling water required and drastically reducing the energy of the cooling water supply. In addition, the water-cooled condenser and the air-cooled condenser were installed in parallel to expand and operate according to the air temperature conditions to increase the cooling effect and to maximize the efficiency of energy use.

1 is an explanatory view of a conventional turbine bearing lubricating oil water cooling system.
2 is an explanatory diagram of a turbine bearing lubricating oil cooling system using refrigerant vaporization heat.
3 is an explanatory diagram of a case where the refrigerant circulation is enhanced.
4 is an explanatory view of applying an air-cooled condenser as a condenser.
5 is a diagram illustrating a case where a water-cooled condenser is used as a condenser.
6 is an explanatory diagram illustrating an example in which an air-cooled condenser and a water-cooled condenser are installed in parallel.

     Liquefied gases that easily change state with liquid and gas at pressure at room temperature include propane, butane, ammonia, carbon dioxide, CFC, HCFC, Freon 22 (HCF22), and hydrocarbons. Is being developed. R141b has a boiling point of about 32 ° C, R123 of about 28 ° C, R245fa of 15 ° C, and R245ca of 25 ° C. Since the waste heat of turbine bearing lubricating oil is not a high temperature, it is necessary to use a low temperature boiling refrigerant which easily changes state with liquid and gas at low temperature. In addition, water has a property of boiling at a low temperature when the pressure is low, it is also within the scope of the present invention to adopt a method for lowering the pressure of the refrigerant cooling circuit to boil water at a low temperature.

    1 is an explanatory view of a conventional turbine bearing lubricating oil water cooling system. The lubricating oil whose temperature is raised by frictional heat between the turbine bearing portion and the turbine bearing is collected in the lubricating oil tank 11 along the flow path. A partition (not shown) is installed inside the turbine bearing lubricating oil tank (11). Between the partitions, there is a filter facility for removing foreign matter contained in the lubricating oil, and maintains a differential temperature of the lubricating oil. A lubricant heat exchanger 12 is installed at one side of the lubricant tank 11, and an auxiliary coolant heat exchanger 13 is installed at one outside of the lubricant tank 11, and a lubricant heat exchanger 12 and an auxiliary coolant heat exchanger 13 are provided. Auxiliary coolant pipe 14 is installed to be a closed circulation circuit between the) and the coolant pump 15 is installed on one side of the auxiliary coolant pipe 14 pipeline. The auxiliary coolant heat exchanger 13 is manufactured in a structure in which the primary cooling space (not shown) through which the auxiliary coolant flows and the secondary cooling space (not shown) through which the coolant flows exchange heat. The principle of operation is as follows. The lubricating oil in the lubricating oil tank 11 heats the lubricating oil heat exchanger 12 installed at one side of the lubricating oil tank 11 while the continuous flow is generated by the operation of the lubricating oil circulation pump (not shown). When the coolant pump 15 is operated, the auxiliary coolant (not shown) filled in the subcooling system, which is a water cooling method, absorbs heat from the heated lubricating oil heat exchanger 12 and the primary cooling space of the auxiliary coolant heat exchanger 13. It is circulated to and performs the function of cooling by discarding this heat to the coolant flowing in the secondary cooling space. As shown here, the auxiliary coolant and the coolant must be forced to circulate continuously. Therefore, a large amount of energy is used for forced circulation because the cooling is performed.

    2 is an explanatory diagram of a turbine bearing lubricating oil cooling system using refrigerant vaporization heat. A lubricant heat exchanger 12 is installed at one side of the lubricant tank 11 in which the turbine bearing lubricant oil is stored, and a condenser 21 is installed at an upper side of the lubricant heat exchanger 12 outside the lubricant tank 11. Connect the upper outlet of the heat exchanger 12 and the upper outlet of the condenser 21 to penetrate the gas pipe 22, and the lower outlet of the lubricating oil heat exchanger 12 and the lower outlet of the condenser 21 to penetrate the liquid pipe 23. Lubricating oil heat exchanger (12), gas pipe (22), condenser (21), liquid pipe (23) and lubricating oil heat exchanger (12). And a refrigerant which can be boiled by the heat applied from the lubricating oil to the lubricating oil heat exchanger 12 in the space except the condenser 21. On the upper side of the gas pipe 22, a gas outlet 24 is installed to inject refrigerant into the closed circulation refrigerant cooling circuit or to remove non-condensable gas. The use of either liquefied gas or water as the refrigerant is also included in the scope of the present invention. The boiling point of water varies depending on the degree of vacuum in the closed circulation refrigerant cooling circuit. The principle of operation is as follows. The lubricating oil in the lubricating oil tank 11 heats the lubricating oil heat exchanger 12 installed at one side of the lubricating oil tank 11 while the continuous flow is generated by the operation of the lubricating oil circulation pump (not shown). Since the refrigerant boiling inside the lubricating oil heat exchanger 12 is filled with heat provided by the lubricating oil, the lubricating oil is cooled by the refrigerant vaporization heat while the refrigerant is boiling. The gas refrigerant vaporized by boiling is introduced into the condenser 21 through the gas pipe 22 to discard heat and condensed and liquefied to change state into a liquid refrigerant. The liquid refrigerant flows back into the lubricating oil heat exchanger 12 by gravity to complete one cycle of cooling. Since the circulation of the refrigerant is not a pump but the waste heat and gravity of the lubricating oil, it is a natural circulation method and it is very effective because it does not use energy for the refrigerant circulation.

    3 is an explanatory diagram of a case where the refrigerant circulation is enhanced. In FIG. 2, in order to reinforce the refrigerant circulation, a refrigerant tank 31 is installed on one side of the liquid pipe 23 pipeline, or a refrigerant pump 32 having a bypass circuit 33 in which a check valve 34 is installed in parallel is installed. It is characteristic. Refrigerant tank can be installed for the stable supply of the liquid refrigerant, when strong cooling is required to operate the refrigerant pump 32 can increase the cooling performance by the rapid circulation of the liquid refrigerant. In general, the refrigerant pump 32 is stopped and the liquid refrigerant is supplied to the bypass circuit 33 having the check valve 34 opened so that natural circulation of the refrigerant occurs. It is also possible to adjust the cooling performance by adding (not shown) a control device for adjusting the opening and closing degree of the check valve (34).

    4 is an explanatory view of applying an air-cooled condenser as a condenser. In FIG. 2, the air cooling condenser 41 is installed as the condenser 21. In this case, the cooling cost can be reduced by drastically reducing the amount of cooling water required. In Korea, the air temperature of 20 ℃ or less corresponds to about 6,000 hours of 8,760 hours a year, so that the cooling of the turbine bearing lubricating oil can be performed smoothly even if it is cooled by air cooling.

    5 is a diagram illustrating a case where a water-cooled condenser is used as a condenser. In FIG. 2, the water-cooled condenser 51 is installed as the condenser 21. In this case, cooling performance can be improved. The water-cooled condenser 51 is manufactured in a structure in which a primary cooling space (not shown) through which a refrigerant circulates and a secondary cooling space (not shown) through which cooling water flows are heat-exchanged.

    6 is an explanatory diagram illustrating an example in which an air-cooled condenser and a water-cooled condenser are installed in parallel. In FIG. 2, the air-cooled condenser 41 and the water-cooled condenser 51 are installed in parallel as the condenser 21. In this case, if there is no problem even when cooling by air cooling because the air temperature is low, only the air-cooled condenser 41 is operated. It can improve performance. Therefore, it is also included in the scope of the present invention to install one or more air-cooled condenser 41 and the water-cooled condenser 51 in parallel as the condenser 21.

11: Lube oil tank 12: Lube oil heat exchanger
13: auxiliary coolant heat exchanger 14: auxiliary coolant piping
15: cooling water pump 21: condenser
22: gas piping 23: liquid piping
24 gas outlet 31 refrigerant tank
32: refrigerant pump 33: bypass circuit
34 check valve 41 air-cooled condenser
51: water-cooled condenser

Claims (6)

     A lubricant oil tank 11 in which turbine bearing lubricant oil is stored; A lube oil heat exchanger (12) installed at one side of the lube oil tank (11); A condenser 21 installed on an upper side of the lubricant oil heat exchanger 12 outside the lubricant oil tank 11; A gas pipe 22 connecting the lubricating oil heat exchanger 12 to the upper outlet and the condenser 21 to the upper outlet; A liquid pipe 23 connecting the lower outlet of the lubricating oil heat exchanger 12 and the lower outlet of the condenser 21; A closed circulation refrigerant cooling circuit connected to the lubricating oil heat exchanger (12), the gas piping (22), the condenser (21), and the liquid piping (23) and the lubricating oil heat exchanger (12); A refrigerant capable of boiling by heat applied from the lubricating oil filled in the lubricating oil heat exchanger 12 in the space except the condenser 21 and making the closed circulation refrigerant cooling circuit vacuum; Turbine bearing lubricating oil cooling system using a refrigerant vaporization heat, characterized in that consisting of a gas discharge port (24) installed on the upper side of the gas pipe (22).        The turbine bearing lubricating oil cooling system using refrigerant vaporization heat according to claim 1, wherein either liquefied gas or water is used as the refrigerant.        According to claim 1, characterized in that the refrigerant pump (32) having a bypass circuit (33) in which the refrigerant tank 31 is provided on one side of the liquid pipe 23, or the check valve 34 is provided in parallel. Turbine bearing lubricating oil cooling system using refrigerant vaporization heat.        The turbine bearing lubricating oil cooling system using refrigerant vaporization heat according to claim 1, wherein an air cooling condenser (41) is provided as a condenser (21).        The turbine bearing lubricating oil cooling system using refrigerant vaporization heat according to claim 1, wherein the water condenser (51) is provided as a condenser (21).        The turbine bearing lubricating oil cooling system using refrigerant vaporization heat according to claim 1, wherein the condenser (21) is installed in parallel by combining one or more air-cooled condensers (41) and water-cooled condensers (51).
KR1020100043256A 2010-05-09 2010-05-09 The cooling system for lubricant oil of turbine bearing using refrigerant evaporation heat KR20100056434A (en)

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KR1020100043256A KR20100056434A (en) 2010-05-09 2010-05-09 The cooling system for lubricant oil of turbine bearing using refrigerant evaporation heat

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108488368A (en) * 2018-05-18 2018-09-04 安陆市凯达环保设备有限公司 A kind of machine oil outer circulation cooling and lubricating system applied to horizontal particle machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108488368A (en) * 2018-05-18 2018-09-04 安陆市凯达环保设备有限公司 A kind of machine oil outer circulation cooling and lubricating system applied to horizontal particle machine

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