KR101614928B1 - Organic rankine cycle system - Google Patents

Organic rankine cycle system Download PDF

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Publication number
KR101614928B1
KR101614928B1 KR1020150087609A KR20150087609A KR101614928B1 KR 101614928 B1 KR101614928 B1 KR 101614928B1 KR 1020150087609 A KR1020150087609 A KR 1020150087609A KR 20150087609 A KR20150087609 A KR 20150087609A KR 101614928 B1 KR101614928 B1 KR 101614928B1
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KR
South Korea
Prior art keywords
flow path
storage tank
working fluid
lubricant
lubricating oil
Prior art date
Application number
KR1020150087609A
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Korean (ko)
Inventor
강형묵
김광호
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한국과학기술연구원
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Priority to KR1020150087609A priority Critical patent/KR101614928B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K21/00—Steam engine plants not otherwise provided for
    • 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
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • 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
    • 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
    • F05D2260/98—Lubrication

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

The present invention relates to an organic Rankine cycle system comprising an evaporator for heating and evaporating a working fluid, an expander for generating a driving force using a working fluid evaporated in the evaporator, a condenser for condensing the working fluid discharged from the expander, And a circulation pump for pressurizing the working fluid condensed by the condenser and returning the working fluid to the evaporator, wherein the one side is connected to the evaporator side and the other side is connected to the inflator side, And a high-pressure region and a low-pressure region; And a lubricant storage tank connected to the high pressure region of the lubricant supply portion through a first flow path and connected to the low pressure region of the lubricant supply portion through a second flow path and storing lubricant oil, And the lubricating oil stored in the lubricating oil storage tank is supplied to the low pressure region having a low internal pressure of the lubricating portion through the second flow path.

Description

[0002] ORGANIC RANKINE CYCLE SYSTEM [0003]

The present invention relates to an organic Rankine cycle system, and more particularly to an organic Rankine cycle system that can easily supply lubricant to an expander using the working fluid's own pressure in an organic Rankine cycle system.

Recently, environmental and energy issues have become heavy issues in all countries around the world, and the environment and energy industry are becoming important factors for promising industries and national competitiveness.

In order to cope with global warming and prepare for the era of high oil prices, it is essential to supply and expand renewable energy that can replace current fossil fuel energy. It recognizes the renewable energy industry as a high value added next generation industry worldwide, We are continuously supporting industry upbringing.

In particular, the development of technologies for improving the efficiency of systems that use renewable energy rather than fossil fuels has attracted the most attention as a preliminary issue. As part of such efforts, technical studies on the improvement of efficiency of organic Rankine cycle using industrial waste heat and renewable energy Is going on.

A typical organic Rankine cycle system is a system in which a gaseous working fluid having a high pressure of 10 bar or more while passing through an evaporator is converted into an electric energy, which is generated by rotating an expander such as a turbine.

In the organic Rankine cycle system as described above, lubricating oil is generally supplied for the purpose of preventing abrasion of components in the expander, and lubricating oil must be supplied on the route of the high-pressure working fluid, The high pressure oil pump should be used or the low pressure oil pump should be supplied from the low pressure side of the pump. As a result, the system becomes complicated and the efficiency of the evaporator deteriorates, resulting in an increase in cost.

Korean Patent Laid-Open Publication No. 2014-0062161 (Feb.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an organic Rankine cycle system capable of easily supplying lubricant to an inflator through the use of a self- I have to.

According to an aspect of the present invention, there is provided an evaporator comprising: an evaporator for heating and evaporating a working fluid; an expander for generating driving force using a working fluid evaporated in the evaporator; a condenser for condensing the working fluid discharged from the expander; And a circulation pump for pressurizing the working fluid condensed by the condenser and returning the working fluid to the evaporator, wherein the one side is connected to the evaporator side, the other side is connected to the inflator side, A refueling section in which a high-pressure region and a low-pressure region are formed by setting the distribution differently according to the location; And a lubricant storage tank connected to the high pressure region of the lubricant supply portion through a first flow path and connected to the low pressure region of the lubricant supply portion through a second flow path and storing lubricant oil, And the lubricating oil stored in the lubricating oil storage tank is supplied to the low pressure region having a low internal pressure of the lubricating portion through the second flow path.

According to the present invention, the refueling portion includes a pipe portion including an inlet portion having one side connected to the evaporator side and a discharge portion having the other side connected to the inflator side, and between the inlet portion and the discharge portion of the pipe portion, Pressure region formed on the inlet portion side and the low-pressure region formed on the discharge portion side with respect to the blocking portion as a reference, and a first portion connected to the lubricant storage tank, A flow path and a second flow path are provided.

According to the present invention, there is further provided an oil separator between the inflator and the condenser, which separates the lubricating oil from the working fluid discharged from the inflator and recovers the lubricating oil to the lubricating oil storage tank.

According to the present invention, the first opening and closing valve for selectively opening and closing the respective flow paths is provided in the first flow path and the second flow path, and the return line between the oil separator and the lubricant storage tank is selectively opened and closed A second on-off valve is provided.

According to the present invention, the oil separator is disposed at a position higher than the position of the lubricant storage tank so that the lubricant separated from the oil separator can be recovered to the lubricant storage tank by gravity.

According to the present invention, a low-pressure pump is provided in the recovery line so that the lubricating oil separated from the oil separator can be recovered to the lubricating oil storage tank.

According to the organic Rankine cycle system of the present invention having the above-described structure, lubricating oil can be easily supplied to the inflator using only the self-pressure of the working fluid flowing from the evaporator without a separate driving source.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the flow of a working fluid and lubricant in an organic Rankine cycle system according to the present invention; FIG.
2 is a perspective view showing an oil feed unit of the organic Rankine cycle system according to the present invention.
3 is a view showing the results of the analysis of the pressure gradient of the fuel supply portion according to the present invention.
4 is a configuration diagram showing the flow of working fluid and lubricant in the organic Rankine cycle system according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 4. FIG.

1, an organic Rankine cycle system according to the present invention includes an evaporator 100, an inflator 200, a condenser 300, and a circulation pump 400, and through the inflator 200, .

Referring to FIG. 1, there is shown an evaporator 100 for heating and evaporating a working fluid of a liquid, an expander 200 which is lubricated by a lubricating oil and converts a swelling force of a working fluid evaporated in the evaporator 100 into a rotational force, A fluid separator 500 for separating the lubricating oil discharged from the inflator 200 into a lubricating oil storage tank 600 and a condenser 300 for condensing the working fluid separated from the lubricating oil by the oil separator 500 And a circulation pump 400 for pressurizing the working fluid condensed by the condenser 300 and returning the working fluid to the evaporator 100.

The rotary driving force of the inflator 200 is used to rotate a generator (not shown) connected to the rotary driving shaft, or is directly used as a rotary driving force in a desalination facility. The inflator (200) receives the working fluid evaporated by heat exchange with the heat source by the evaporator (100), converts the inflating force of the working fluid into a rotational force, expands the working fluid, .

As shown in Figure 1, in the organic Rankine cycle system according to the present invention, the inflator 200, which is provided with a lubricating oil, is provided with a profile of the inflator 200, for example, Lt; / RTI > In addition, it is possible to maintain the confidentiality of the work area and to prevent the loss of steam due to the internal overflow, thereby increasing the expansion efficiency.

According to an embodiment of the present invention, a lubricating oil supply device is provided between the lubricating oil storage tank 600 and the inflator 200 to supply lubricant to the inflator 200 using the self-pressure of the working fluid flowing from the evaporator 100. (10).

The oil supply unit 10 includes a piping unit 11 having one side connected to the evaporator 100 side and the other side connected to the inflator 200 side and having different internal pressure distributions.

The piping unit 11 can be divided into a high-pressure region having a high internal pressure and a low-pressure region having a relatively low pressure as compared with the high-pressure region by the flow pressure of the working fluid delivered from the evaporator 100. The division into the high-pressure region and the low-pressure region can be performed in accordance with the shape of the piping section 11 and the additional configuration. Since the back pressure of the working fluid can act on the lubricant storage tank 600 in the high pressure region of the piping 11, the lubricating oil stored in the lubricant storage tank 600 is discharged to the piping portion 11).

2, according to the embodiment of the present invention, the oil supply portion 10 includes an inlet portion 12 having one side connected to the side of the evaporator 100 and an inlet portion 12 having a side connected to the side of the inflator 200 And a discharge portion 13 which is formed in the discharge port. The piping section 11 is provided with a blocking section 14 for blocking the flow pressure of the working fluid between the introduction section 12 and the discharge section 13. That is, the blocking portion 14 partially blocks the flow path of the piping portion 11, so that the pressure distribution inside the piping portion 11 varies depending on the position with respect to the blocking portion 14.

The inside of the piping section 11 between the introduction section 12 and the blocking section 14 is a high pressure area where the pressure rises due to the flow pressure of the working fluid flowing from the evaporator 100, The inside of the piping 11 between the discharge portions 13 becomes a low pressure region where the pressure is relatively lower than that in the high pressure region due to the pressure drop of the working fluid by the blocking portion 14. [

As shown in FIG. 3, the blocking portion 14 is a plate member fixed to the inside of the pipe 11, and the pressure of the high-pressure region rises as the cross-sectional area of the blocking portion 14 increases , The pressure in the low-pressure region is relatively lowered, and a pressure gradient is generated.

A first flow path 15 and a second flow path 16 are provided as fluid pressure and lubricant oil passages respectively connected to the lubricant storage tank 600 in the high pressure area and the low pressure area of the piping part 11. Particularly, the first and second flow paths 15 and 16 are provided with a first opening / closing valve 17 for selectively opening and closing the respective flow paths.

Accordingly, the first flow path 15, which is located in the high-pressure region and is connected to the lubricant storage tank 600, is operated by the flow pressure of the working fluid from the evaporator 100, The pressure is increased. That is, the dynamic pressure of the working fluid imposed on the high-pressure region is converted into a static pressure, thereby causing a pressure rise in the high-pressure region.

The second passage 16, which is located in the low-pressure region and is connected to the lubricant storage tank 600, is relatively lower in pressure than the first passage 15 by the blocking portion 14.

Accordingly, since the speed of the fluid in the first flow path 15 decreases and high pressure acts on the lubricant storage tank 600 according to the converted high static pressure, the lubricant stored in the lubricant storage tank 600 flows into the second flow path Pressure region of the piping section 11 through the working fluid flow path 1 and then mixed with the working fluid and supplied to the inflator 200 through the working fluid flow path 1. [

The lubricating oil supplied to the expander 200 and lubricated is supplied to the oil separator 500 from the inflator 200 together with the expanded working fluid and then separated from the working fluid introduced into the oil separator 500 . The working fluid separately purified from the lubricating oil is supplied from the oil separator 500 to the condenser 300 and the condensed working fluid is supplied back to the evaporator 100 by the circulating pump 400. [

The lubricant separated by the oil separator 500 is recovered to the lubricant storage tank 600 through the recovery line 2 and the recovery line 2 is connected to the oil separator 500 and the lubricant storage tank 600 And a second on-off valve (20) for selectively opening and closing the recovery line (2) is provided.

As shown in FIG. 4, the oil separator 500 is configured to be installed higher than the position of the lubricant storage tank 600. That is, the oil separator 500 is preferably provided at a position higher than the lubricant storage tank 600 so that the lubricant separated from the oil separator 500 can be recovered to the lubricant storage tank 600 by gravity .

When the oil separator 500 is not located at a position higher than the position of the lubricant storage tank 600, a pressure is applied between the oil separator 500 and the lubricant storage tank 600, Pressure pump for transporting the liquid.

On the other hand, when the amount of lubricating oil stored in the lubricating oil storage tank 600 is insufficient to recover a certain amount of the lubricating oil shortage in the oil separator 500, the second opening / closing valve 20 is opened, The first opening and closing valve 17 of the two flow paths 16 is shut off so that the lubricating oil collected in the oil separator 500 can be moved to the lubricating oil storage tank 600 through the recovery line 2.

Therefore, the organic Rankine cycle system according to the present invention can supply the lubricant to the inflator 200 without an additional driving source by providing the oil supply part 10 using the self-pressure of the working fluid supplied from the evaporator 100 .

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It should be understood that various modifications made by the person skilled in the art are also within the scope of protection of the present invention.

10: feeding part 11: piping part
12: inlet portion 13: outlet portion
14: breaking portion 15: first flow path
16: second flow path 17: first opening / closing valve
20: second opening / closing valve

Claims (6)

A condenser for condensing the working fluid discharged from the inflator, a condenser for condensing the working fluid condensed by the condenser, and a condenser for condensing the working fluid condensed by the condenser, And circulating the refrigerant to the evaporator, the system comprising:
A supply section having one side connected to the evaporator side, the other side connected to the inflator side, and a high pressure area and a low pressure area formed by setting an internal pressure distribution according to a position; And
And a lubricant storage tank connected to the high pressure region of the lubricant supply portion through a first flow path and connected to the low pressure region of the lubricant supply portion through a second flow path,
The back pressure of the working fluid flowing into the lubricant storage tank through the first flow path acts to supply the lubricating oil stored in the lubricant storage tank to the low pressure region having a low inner pressure of the lubricant supply portion through the second flow path. Organic Rankine Cycle System.
The method according to claim 1,
Wherein the refueling portion includes a piping portion including an inlet portion having one side connected to the evaporator side and a discharge portion having the other side connected to the inflator side,
A blocking portion for partially blocking the flow path of the piping portion and generating a pressure gradient in the piping portion is provided between the inlet portion and the discharge portion of the piping portion,
Wherein a first flow path and a second flow path are provided in the high pressure region formed toward the inlet portion and the low pressure region formed toward the discharge portion with respect to the blocking portion, respectively, the first and second flow paths being connected to the lubricant storage tank.
3. The method according to claim 1 or 2,
Further comprising an oil separator between the expansion unit and the condenser for separating the lubricating oil from the working fluid discharged from the inflator and recovering the lubricating oil into the lubricating oil storage tank.
The method of claim 3,
Wherein the first flow path and the second flow path are provided with a first opening / closing valve for selectively opening and closing each flow path,
And a second on-off valve for selectively opening and closing the recovery line is installed on the recovery line between the oil separator and the lubricant storage tank.
5. The method of claim 4,
Wherein the oil separator is disposed at a position higher than a position of the lubricant storage tank so that the lubricant separated from the oil separator can be recovered to the lubricant storage tank by gravity.
5. The method of claim 4,
And the low-pressure pump is provided in the recovery line so that the lubricating oil separated in the oil separator can be recovered to the lubricating oil storage tank.




KR1020150087609A 2015-06-19 2015-06-19 Organic rankine cycle system KR101614928B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101836729B1 (en) * 2016-10-24 2018-03-08 현대자동차주식회사 Lubricating oil regenration apparatus and method
KR101869161B1 (en) * 2016-10-12 2018-06-19 한국수력원자력 주식회사 Recovery system of Turbine lubricating oil
CN108733932A (en) * 2018-05-24 2018-11-02 奥克斯空调股份有限公司 Circuit design method and apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012127231A (en) 2010-12-14 2012-07-05 Kobe Steel Ltd Rankine cycle system and power generation system
JP2013108439A (en) 2011-11-21 2013-06-06 Kobe Steel Ltd Apparatus for utilizing thermal energy and operating method thereof
JP2014001667A (en) 2012-06-18 2014-01-09 Nippon Soken Inc Rankine cycle device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012127231A (en) 2010-12-14 2012-07-05 Kobe Steel Ltd Rankine cycle system and power generation system
JP2013108439A (en) 2011-11-21 2013-06-06 Kobe Steel Ltd Apparatus for utilizing thermal energy and operating method thereof
JP2014001667A (en) 2012-06-18 2014-01-09 Nippon Soken Inc Rankine cycle device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101869161B1 (en) * 2016-10-12 2018-06-19 한국수력원자력 주식회사 Recovery system of Turbine lubricating oil
KR101836729B1 (en) * 2016-10-24 2018-03-08 현대자동차주식회사 Lubricating oil regenration apparatus and method
US10407643B2 (en) 2016-10-24 2019-09-10 Hyundai Motor Company Apparatus and method for regenerating lubricating oil
CN108733932A (en) * 2018-05-24 2018-11-02 奥克斯空调股份有限公司 Circuit design method and apparatus

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