KR101744793B1 - Power generating system using boil off gas - Google Patents

Power generating system using boil off gas Download PDF

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Publication number
KR101744793B1
KR101744793B1 KR1020160030340A KR20160030340A KR101744793B1 KR 101744793 B1 KR101744793 B1 KR 101744793B1 KR 1020160030340 A KR1020160030340 A KR 1020160030340A KR 20160030340 A KR20160030340 A KR 20160030340A KR 101744793 B1 KR101744793 B1 KR 101744793B1
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South Korea
Prior art keywords
gas
lng
turbine generator
gas pipe
surge tank
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Application number
KR1020160030340A
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Korean (ko)
Inventor
유상석
임석연
윤진원
신가희
정문청
Original Assignee
동명대학교산학협력단
충남대학교산학협력단
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Priority to KR1020160030340A priority Critical patent/KR101744793B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C3/00—Gas-turbine plants characterised by the use of combustion products as the working fluid
    • F02C3/20—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products
    • F02C3/22—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products the fuel or oxidant being gaseous at standard temperature and pressure
    • 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
    • F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • Y02T10/32—

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

A power generation system according to the present invention includes: a plurality of LNG tanks in which LNG is stored; A gas pipe for collecting and supplying evaporative gas generated in the plurality of LNG tanks to one side; And a turbine generator for generating electric power by burning the evaporated gas delivered from the gas pipe. INDUSTRIAL APPLICABILITY The power generation system using the evaporative gas according to the present invention can minimize the wasteful evaporation gas by producing electric power by using the evaporative gas generated from the LNG tank and can continuously generate electric power even if the amount of generated evaporative gas per hour is irregular, And it is advantageous that it can contribute to solving environmental pollution problem by preventing waste of energy.

Figure R1020160030340

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power generation system using boil-

The present invention relates to a power generation system for generating power using evaporative gas generated from an LNG tank, and more particularly, to a power generation system for collecting evaporative gas generated from a plurality of LNG tanks and supplying it to a turbine generator And more particularly to a power generation system configured.

In general, Liquefied Natural Gas is a clean fuel and its reserves are known to be richer than petroleum, and its usage is rapidly increasing as mining and transfer technologies develop. LNG is a liquid produced by lowering methane, which is the main component of natural gas, under a pressure of -162 degrees Celsius under 1 atm. The volume of liquefied methane is about 1/600 of the volume of methane in a gaseous state as standard. 0.42, which is about one half of the specific gravity of crude oil.

Because of this, LNG has advantages of easy transportation and storage, but it is very dangerous when it leaks because it has cryogenic properties. Therefore, LNG is very dangerous when it is leaked. Therefore, LNG is separated from other gas storage tank made of insulator To be transported or stored. Particularly, in the case of LNG carriers, the crude oil carrier and the other ones are transported in a liquid state at -162 ° C, and since the vaporization point of LNG is extremely low at -162 ° C, thorough warming is required to prevent vaporization. However, full insulation is practically impossible and the liquefied LNG is changing to gaseous evaporative gas at a rate of 0.15% per day during the operation of the ship.

When the amount of evaporation gas generated increases, the internal pressure of the LNG tank increases. Therefore, it is a kind of simple incinerator in which the evaporation gas generated when the evaporation gas is generated above the reference value is discharged to the outside, or simply the evaporation gas is burned out Have been used as fuels for thermal oxidizers and the like.

In order to solve such a problem that the evaporation gas is wasted or wasted, a method of re-liquefying the evaporated gas and returning it to the LNG tank has been proposed. There is a problem in that it is expensive to install a device for re-liquefying the evaporation gas and a separate power is consumed for re-liquefaction of the evaporation gas, so that the economical effect is not significant.

KR 10-1521570 B1

The present invention has been proposed in order to solve the above-mentioned problems. It is an object of the present invention to provide a method and apparatus for generating electricity using evaporative gas generated in an LNG tank, capable of continuously generating electric power even when the amount of evaporation gas generated in each hour is irregular, And to provide a power generation system capable of preventing environmental pollution.

According to an aspect of the present invention, there is provided a power generation system including: a plurality of LNG tanks in which LNG is stored; A gas pipe for collecting and supplying evaporative gas generated in the plurality of LNG tanks to one side; And a turbine generator for generating electric power by burning the evaporated gas delivered from the gas pipe.

A check valve is provided on the inlet side of the gas pipe, and a control valve is provided on the outlet side of the gas pipe for controlling the amount of evaporated gas discharged.

A surge tank is disposed between the check valve and the control valve in the gas pipe.

And a waste heat utilization unit for heating the fluid or generating electric power by using thermal energy discharged from the turbine generator.

And a compressor installed between the check valve and the surge tank in the gas pipe channel for compressing the evaporated gas flowing through the gas pipe and supplying the compressed gas to the surge tank.

And a pressure gauge for measuring the internal pressure of the surge tank, wherein the compressor is configured to be supplied with power from the turbine generator when the internal pressure of the surge tank is lowered below a reference value.

INDUSTRIAL APPLICABILITY The power generation system using the evaporative gas according to the present invention can minimize the wasteful evaporation gas by producing electric power by using the evaporative gas generated from the LNG tank and can continuously generate electric power even if the amount of generated evaporative gas per hour is irregular, And it is advantageous that it can contribute to solving environmental pollution problem by preventing waste of energy.

1 is a schematic view of a power generation system using an evaporative gas according to the present invention.
2 is a schematic view of a second embodiment of a power generation system using evaporative gas according to the present invention.
3 is a schematic view of a third embodiment of a power generation system using evaporative gas according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a power generation system using evaporative gas according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic view of a power generation system using an evaporative gas according to the present invention.

Generally, when liquefied natural gas is stored in the LNG tank 100 for a long time, a portion of the liquefied natural gas in the LNG tank 100 is heated to generate boil-off gas. When such a large amount of evaporation gas is generated, there arises a problem that the pressure in the LNG tank 100 is raised. Therefore, the evaporation gas is periodically released to the atmosphere or the evaporation gas is simply burned in the atmosphere I am using the method.

The power generation system according to the present invention is characterized in that it is configured to be utilized for the purpose of generating power without wasting evaporated gas generated as described above. That is, as shown in FIG. 1, the power generation system according to the present invention includes a plurality of LNG tanks 100 in which an LNG is stored, and a plurality of LNG tanks 100, And a turbine generator 300 for generating electric power by burning the evaporated gas delivered from the gas pipe 200.

The use of the power generation system according to the present invention is advantageous in that the utilization efficiency of the turbine generator 300 is very high since the turbine generator 300 can be operated without discarding the evaporated gas generated in each LNG tank 100 .

Since the amount of the evaporated gas generated in one LNG tank 100 is not so large, if the turbine generator 300 is configured to receive only the evaporated gas generated in one LNG tank 100, the turbine generator 300, It may be difficult to stably operate. Accordingly, it is preferable that the power generation system according to the present invention is arranged such that the gas pipe 200 is disposed so as to collect the evaporated gas generated from the plurality of LNG tanks 100 and provide it to the turbine generator 300.

In order to prevent the phenomenon that the evaporated gas collected from each LNG tank 100 flows back into the LNG tank 100 while flowing through the gas pipe 200 to the turbine generator 300, It is preferable that a check valve 210 is provided on the side closer to the LNG tank 100 (more specifically, on the side closer to the LNG tank 100). The outlet side of the gas pipe 200 (more specifically, the side closer to the turbine generator 300) is connected to the turbine generator 300 so that the evaporated gas flowing through the gas pipe 200 can be supplied to the turbine generator 300 at a constant pressure and flow rate. A control valve 220 for controlling the evaporation gas discharge amount may be provided. Since the check valve 210 and the control valve 220 are widely commercialized in the related art, the details of the internal structure and operation principle of the check valve 210 and the control valve 220 The description is omitted.

2 is a schematic view of a second embodiment of a power generation system using evaporative gas according to the present invention.

The amount of the evaporation gas generated in each LNG tank 100 can be variously changed according to various conditions such as the heat insulation property of each LNG tank 100, the external temperature, the applied vibration, and the like. Therefore, when the evaporated gas generated in the LNG tank 100 is supplied to the turbine generator 300 through the gas pipe 200 as in the embodiment shown in FIG. 1, the amount of the evaporated gas supplied to the turbine generator 300 Can not be constant and deviations may occur severely, and efficient development may not be possible.

Therefore, the power generation system according to the present invention may include a surge tank 400 that collects a predetermined amount of evaporated gas generated in each LNG tank 100 and supplies the same to the turbine generator 300. The control valve 220 is disposed between the surge tank 400 and the turbine generator 300 so that the evaporation gas supplied from the surge tank 400 to the turbine generator 300 can be adjusted according to the user's selection. It should be located.

Meanwhile, the evaporated gas supplied to the turbine generator 300 is used for power generation in the turbine generator 300 and then discharged in the form of heat energy. At this time, if the thermal energy discharged from the turbine generator 300 is discarded to the outside, energy utilization rate is lowered and environmental pollution may be caused. Accordingly, the power generation system according to the present invention may further include a waste heat utilization device 500 for recycling thermal energy, that is, waste heat discharged from the turbine generator 300.

The waste heat utilization device 500 is constructed such that it can heat a fluid such as heating water or generate electric power by using thermal energy emitted from the turbine generator 300. Such a waste heat utilization device 500 can be used in an incinerator or a geothermal power plant And the detailed description thereof will be omitted.

Of course, the waste heat utilization device 500 may be replaced with various structures other than the structure for heating the fluid or the structure for generating power, as mentioned above, as long as the waste heat discharged from the turbine generator 300 can be recycled.

3 is a schematic view of a third embodiment of a power generation system using evaporative gas according to the present invention.

Generally, since the pressure of the evaporation gas generated in the LNG tank 100 is not so high, the pressure of the evaporation gas collected in the surge tank 400 is not so high. If the pressure of the evaporation gas in the surge tank 400 is not high, the evaporation gas can not be supplied to the turbine generator 300 at a high flow rate per hour. Therefore, there is a limit to improve the power generation performance of the turbine generator 300.

The power generation system according to the present invention is installed between the check valve 210 and the surge tank 400 in the gas pipe 200 to compress the evaporation gas flowing through the gas pipe 200, The compressor 600 may be further provided. Since the high-pressure evaporation gas can be delivered to the surge tank 400 even when the pressure of the evaporation gas generated in each LNG tank 100 is low, the high- It is possible to supply the gas and thereby improve the power generation performance of the turbine generator 300.

In order to operate the compressor 600, electric power is required. The electric power for operating the compressor 600 may be supplied from the outside, and as shown in this embodiment, a turbine generator (Not shown). In the case where the compressor 600 is configured to operate by receiving power from the turbine generator 300, there is no need to draw additional power from the outside, so that the advantages of the present invention that the installation space of the power generation system is eliminated .

In addition, when the pressure inside the surge tank 400 is excessively increased, the surge tank 400 may be damaged. The power generation system according to the present invention may include a pressure gauge 410 for measuring the internal pressure of the surge tank 400 And the compressor 600 is operated by receiving power from the turbine generator 300 when the internal pressure of the surge tank 400 is lowered below a reference value and the internal pressure of the surge tank 400 is lower than a reference value It is preferable to set it to be stopped.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments. It will also be appreciated that many modifications and variations will be apparent to those skilled in the art without departing from the scope of the invention.

100: LNG tank 200: Gas pipe
210: check valve 220: control valve
300: turbine generator 400: surge tank
410: Pressure gauge 500: Waste heat utilization
600: Compressor

Claims (6)

A plurality of LNG tanks in which LNG is stored;
A gas pipe for collecting and supplying evaporative gas generated in the plurality of LNG tanks to one side;
A turbine generator for generating electric power by burning the evaporated gas delivered from the gas pipe;
A check valve provided at an inlet side of the gas pipe;
A control valve provided at an outlet side of the gas pipe for regulating an evaporated gas discharge amount;
A surge tank disposed between the check valve and the control valve of the gas pipe;
A waste heat utilization unit for heating the fluid or generating electric power by using thermal energy discharged from the turbine generator;
A compressor installed between the check valve and the surge tank in the gas pipe channel for compressing the evaporated gas flowing through the gas pipe and supplying the compressed gas to the surge tank; And
A pressure gauge for measuring the internal pressure of the surge tank;
Including,
Wherein the compressor is configured to be supplied with power from the turbine generator when the internal pressure of the surge tank is lowered below a reference value.
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KR1020160030340A 2016-03-14 2016-03-14 Power generating system using boil off gas KR101744793B1 (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003056799A (en) * 2001-08-09 2003-02-26 Honda Motor Co Ltd Boil off-gas treating device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003056799A (en) * 2001-08-09 2003-02-26 Honda Motor Co Ltd Boil off-gas treating device

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