KR20140143035A - A Treatment System of Liquefied Natural Gas - Google Patents

Abstract

The present invention relates to a liquefied natural gas (LNG) treatment system comprising: an LNG supply line connected to a first consumer from an LNG storage tank; a pump pressurizing LNG discharged from the LNG storage tank; a heat exchanger; a plurality of boil-off gas compressors; and a cold and heat generating device generating power as a cooled working fluid rotates a turbine. The LNG treatment system according to the present invention can improve energy efficiency as generated energy can be used as a power source for another device, by generating the energy using LNG discharged from the LNG storage tank or waste cold and heat energy of boil-off gas as a power source of the cold and heat generating device.

Description

[0001] The present invention relates to an LNG treatment system,

The present invention relates to an LNG processing system.

A ship is a means of transporting large quantities of minerals, crude oil, natural gas, or more than a thousand containers. It is made of steel and buoyant to float on the water surface. ≪ / RTI >

Such a vessel generates thrust by driving the engine. In this case, the engine uses gasoline or diesel to move the piston so that the crankshaft is rotated by the reciprocating motion of the piston, so that the shaft connected to the crankshaft is rotated to drive the propeller It was common.

In recent years, however, LNG fuel supply systems for driving an engine using LNG as a fuel have been used in an LNG carrier carrying Liquefied Natural Gas (LNG) It is also applied to other ships.

Generally, it is known that LNG is a clean fuel and its reserves are more abundant than petroleum, and its usage is rapidly increasing as mining and transfer technology develops. This LNG is generally stored in a liquid state at a temperature of -162 ° C. or less under 1 atm of the main component. The volume of liquefied methane is about 1/600 of the volume of methane in a gaseous state in a standard state, Is 0.42, which is about one half of the specific gravity of crude oil.

However, the temperature and pressure required to drive the engine may be different from the state of the LNG stored in the tank. Therefore, in recent years, research and development have been made on the technology of controlling the temperature and pressure of the LNG stored in the liquid state and supplying the engine to the engine.

It is an object of the present invention to provide a cold / hot thermal power generator in an LNG or evaporation gas supply line provided between an LNG storage tank and a customer, The present invention is intended to provide an LNG processing system capable of increasing the LNG or evaporative gas treatment efficiency of the system by raising or lowering the temperature of the discharged LNG or the evaporating gas to fit each component of the system so that the fuel can be saved.

It is another object of the present invention to provide a method and apparatus for generating energy by using LNG discharged from an LNG storage tank or evaporated gas discharged from a LNG storage tank as a power source of a cold / So as to provide an LNG processing system capable of increasing energy efficiency.

An LNG processing system according to an aspect of the present invention includes an LNG supply line connected from an LNG storage tank to a first demand point; A pump installed on the LNG supply line for pressurizing the LNG discharged from the LNG storage tank; A heat exchanger provided on the LNG supply line between the first customer and the pump; A plurality of evaporative gas compressors installed on the evaporation gas supply line for supplying the evaporated gas generated by the LNG storage tank to the first demand site; And an evaporative gas supply line between the LNG storage tank and the evaporative gas compressor, the LNG supply line between the LNG storage tank and the pump, or the LNG supply line between the pump and the heat exchanger, The low temperature LNG or the evaporation gas passing through the evaporation gas supply line or the LNG supply line is heat exchanged with the relatively high temperature working fluid circulating along the working fluid circulation line so that the cooled working fluid rotates the turbine And a cold / hot thermal power generator for generating power.

Specifically, the first demander may include a high-pressure engine.

Pressure evaporation gas supply line, one end of which is connected between the plurality of evaporative gas compressors on the evaporation gas supply line, and the other end of which is connected to a second customer, to supply the evaporation gas to the second customer can do.

Specifically, the second demander may include a low-pressure engine.

Specifically, an evaporative gas cooler may be provided between the plurality of evaporative gas compressors.

Specifically, the evaporative gas cooler may be installed in the same number as the plurality of evaporative gas compressors, and may be provided downstream of each of the evaporative gas compressors.

Specifically, the cold / hot thermal power generation apparatus includes a feed pump, a vaporizer, a turbine, and a condenser connected by the working fluid circulation line, wherein the feed pump is connected to the working fluid circulation line between the condenser and the vaporizer Wherein the working fluid is adiabatically compressed and supplied to the vaporizer, and the vaporizer is installed in the working fluid circulating line between the feed pump and the turbine, and supplies the working fluid to the turbine by isobaric heating Wherein the turbine is installed in the working fluid circulation line between the vaporizer and the condenser and supplies the working fluid to the condenser by thermal expansion, and the condenser is connected to the working fluid circulation path between the turbine and the feed pump Line, the evaporation gas supply line between the LNG storage tank and the evaporative gas compressor, the LNG storage The LNG supply line between the tank and the pump or the LNG supply line between the pump and the heat exchanger, the working fluid is equipotential heat released to the feed pump, and the LNG or the evaporation gas And causing heat exchange with the working fluid.

Specifically, the turbine may include using rotational energy generated by the working fluid supplied from the vaporizer as a power source of a third customer.

Specifically, the third customer may include a generator that converts the rotational energy into electric energy.

Specifically, the pump is a high-pressure pump, and the LNG supply line between the LNG storage tank and the high-pressure pump may include a booster pump.

Specifically, the condenser is provided between the working fluid circulation line between the turbine and the feed pump and between the booster pump and the high-pressure pump when the booster pump is provided on the LNG supply line between the LNG storage tank and the pump. And installed in the LNG supply line.

The LNG treatment system according to the present invention is characterized in that a cold / hot thermal power generator is installed in an LNG or evaporation gas supply line provided between an LNG storage tank and a customer, and the temperature of LNG or evaporation gas discharged from the LNG storage tank By raising or lowering to fit the element, the efficiency of LNG or evaporative gas treatment of the system can be increased, saving fuel.

Further, the present invention can generate energy by using cold and hot discarded LNG or evaporated gas discharged from the LNG storage tank as a power source of the cold / hot thermal power generation apparatus, so that the generated energy can be used as a power source of another apparatus, The efficiency can be increased.

1 is a conceptual diagram of a conventional LNG processing system.
2 is a conceptual diagram of an LNG processing system according to a first embodiment of the present invention.
3 is a conceptual diagram of an LNG processing system according to a second embodiment of the present invention.
4 is a conceptual diagram of an LNG processing system according to a third embodiment of the present invention.
5 is a conceptual diagram of an LNG processing system according to a fourth embodiment of the present invention.
6 is a conceptual diagram of an LNG processing system according to a fifth embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a conceptual diagram of a conventional LNG processing system.

1, a conventional LNG processing system 1 includes an LNG storage tank 10, an engine 20, a pump 30, and a heat exchanger 40. At this time, the engine 20 may be a MEGI engine, which is a high pressure engine, or a dual fuel engine, which is a low pressure engine, and the pump 30 may include a boost pump 31 and a high pressure pump 32 .

Hereinafter, LNG may be used in the sense of not only NG (Natural Gas) in liquid state but also NG in supercritical state for the sake of convenience. Boil off gas (BOG) It can be used in the sense of including liquefied evaporative gas.

The conventional LNG processing system 1 is configured to remove LNG in liquid form from the LNG storage tank 10 and pressurize the LNG from the LNG storage tank 10 through the boosting pump 31 and the high pressure pump 32 and then heat it in a heat exchanger 40 And supplied to the engine 20 is used.

In order to use the LNG stored in the LNG storage tank 10 at a temperature of -162 ° C. or lower as the fuel of the engine 20, it is necessary to forcibly request the engine 20 through the pump 30, the heat exchanger 40, In this process, excess energy is consumed and energy is wasted because LNG can not be utilized at all.

2 is a conceptual diagram of an LNG processing system according to a first embodiment of the present invention.

2, the LNG processing system 2 according to the first embodiment of the present invention includes an LNG storage tank 10, a first customer 20a, a second customer 20b, a pump 30, A heat exchanger 40, an evaporative gas compressor 51, and a cold / hot thermal power generator 60. In the first embodiment of the present invention, the LNG storage tank 10, the pump 30, the heat exchanger 40, and the like are denoted by the same reference numerals as those in the conventional LNG processing system 1, Quot; configuration "

The LNG storage tank 10 stores LNG to be supplied to the first and second consumers 20a and 20b to be described later. The LNG storage tank 10 must store the LNG in a liquid state, and the LNG storage tank 10 may have a pressure tank form.

The LNG storage tank 10 includes an outer tank (not shown), an inner tank (not shown), and a heat insulating portion (not shown). The outer tank is a structure of the outer wall of the LNG storage tank 10, and may be formed of steel, and may have a polygonal cross section.

The inner tank is provided inside the outer tank, and can be supported and supported inside the outer tank by a support (not shown). At this time, the support may be provided on the lower end of the inner tank, and may be provided on the side of the inner tank for suppressing lateral movement of the inner tank.

The inner tank can be made of stainless steel and can be designed to withstand pressures from 5 bar to 10 bar (6 bar, for example). The reason for designing the inner tank so as to withstand such a constant pressure is that the inner pressure of the inner tank may be increased as the LNG contained in the inner tank is evaporated to generate the evaporative gas.

A baffle (not shown) may be provided in the inner tank. The baffle means a plate in the form of a lattice. As the baffle is installed, the pressure inside the tank can be evenly distributed to prevent the tank pressure from being concentrated to a part of the tank.

The heat insulating portion is provided between the inner tank and the outer tank and can prevent the external heat energy from being transmitted to the inner tank. At this time, the heat insulating portion may be in a vacuum state. By forming the thermal insulation in a vacuum, the LNG storage tank 10 can withstand higher pressures more efficiently compared to conventional tanks. For example, the LNG storage tank 10 can sustain a pressure of 5 to 20 bar through the vacuum insulation.

As described above, in this embodiment, the use of the pressure tank LNG storage tank 10 having a vacuum type heat insulating portion between the outer tanks and the inner tank can minimize the generation of evaporated gas, and even if the internal pressure increases, It is possible to prevent the occurrence of problems such as breakage of the battery 10.

The present embodiment is also applicable to a case where the evaporative gas generated in the LNG storage tank 10 is supplied to an evaporative gas compressor 51 to be described later and used as a fuel for a second demand point 20b or a first demand point 20a Temperature heat generator 60 to be described later is installed in the evaporation gas supply line 22 between the LNG storage tank 10 and the evaporation gas compressor 51 so that the evaporation gas compressor The temperature of the evaporation gas supplied to the evaporation gas compressor 51 can be raised to a temperature at which the evaporation gas compressor 51 can compress the evaporation gas, and the driving efficiency of the evaporation gas compressor 51 can be improved.

The first and second consumers 20a and 20b are driven through LNG or evaporation gas supplied from the LNG storage tank 10 to generate power. At this time, the first customer 20a is a high- And the second demand point 20b may be a dual fuel engine which is a low pressure engine.

As the piston (not shown) in the cylinder (not shown) reciprocates by the combustion of the LNG, the first and second consumers 20a and 20b rotate the crankshaft (not shown) connected to the piston , And a shaft (not shown) connected to the crankshaft can be rotated. Therefore, as the propeller (not shown) connected to the shaft rotates when the first and second consumers 20a and 20b are driven, the hull can be moved forward or backward.

Of course, in the present embodiment, the first and second consumers 20a and 20b may be engines for driving the propeller, but may be engines for generating power or engines for generating other power. That is, the present embodiment does not specifically limit the types of the first and second consumers 20a and 20b. However, the first and second consumers 20a and 20b may be internal combustion engines that generate driving force by combustion of the LNG.

The first consumer 20a is supplied with supercritical LNG from a heat exchanger 40 to be described later to generate a driving force or a supercritical evaporated gas which is pressurized while passing through an evaporative gas compressor 51 to be described later And the driving force can be generated.

On the other hand, the second demand point 20b is supplied with the evaporated gas pressurized by the evaporative gas compressor 51 to obtain the driving force. The supercritical LNG or the evaporation gas supplied to the first customer 20a may be, for example, a temperature of 30 to 60 DEG C and a pressure of 200 to 400 bar. The state of the LNG or the evaporative gas supplied to the first demand point 20a and the second demand point 20b may vary depending on the states required by the first and second demand points 20a and 20b.

In the case of the second customer 20b, it may be a dual fuel engine in which LNG and oil are selectively supplied without being mixed with the LNG. This is to prevent the mixture of two materials having different combustion temperatures from being mixed, thereby preventing the efficiency of the second customer 20b from being lowered.

An LNG supply line 21 for delivering LNG may be installed between the LNG storage tank 10 and the first customer 20a and a pump 30 and a heat exchanger 40 may be installed in the LNG supply line 21. [ So that the LNG can be supplied to the first customer 20a.

At this time, a fuel supply valve (not shown) is provided in the LNG supply line 21 so that the supply amount of the LNG can be adjusted according to the opening degree adjustment of the fuel supply valve.

The pump 30 is installed on the LNG supply line 21 connected to the lower portion of the LNG storage tank 10 and presses the LNG discharged from the LNG storage tank 10. The pump 30 may include a boosting pump 31 and a high-pressure pump 32.

The boosting pump 31 may be provided on the LNG supply line 21 between the LNG storage tank 10 and the high pressure pump 32 or may be provided in the LNG storage tank 10, So that cavitation of the high-pressure pump 32 is prevented.

Also, the boosting pump 31 can pressurize the LNG from the LNG storage tank 10 to a pressure of several to several tens of bar, and the LNG through the boosting pump 31 can be pressurized to 1 to 25 bar.

The LNG stored in the LNG storage tank 10 is in a liquid state. At this time, the boosting pump 31 may pressurize the LNG discharged from the LNG storage tank 10 to slightly increase the pressure and the temperature, and the LNG pressurized by the boosting pump 31 may still be in a liquid state.

In this embodiment, a temporary storage tank (not shown) is provided on the LNG supply line 21 between the boosting pump 31 and the high-pressure pump 32. In this case, the boosting pump 31 is a temporary storage tank, .

The high-pressure pump 32 pressurizes the LNG discharged from the LNG storage tank 10 to a high pressure so as to be supplied to the first customer 20a. The LNG is discharged from the LNG storage tank 10 at a pressure of about 10 bar and then primarily pressurized in the boosting pump 31 or a temporary storage tank to be described later. The high-pressure pump 32 pressurizes the pressurized liquid LNG And is supplied to the heat exchanger 40 to be described later.

At this time, the high-pressure pump 32 pressurizes the LNG to a pressure required by the first customer 20a, for example, 200 bar to 400 bar and supplies the pressurized LNG to the first customer 20a so that the first customer 20a can supply the power . ≪ / RTI >

The high pressure pump 32 is capable of phase-changing the LNG discharged from the boosting pump 31 to a supercritical state having a higher temperature and a higher pressure than the LNG at a high pressure have. At this time, the temperature of the supercritical LNG may be lower than -20 ° C, which is relatively higher than the critical temperature.

Or the high-pressure pump 32 can pressurize the LNG in a liquid state to a super-cooled liquid state by pressurizing it with a high pressure. Here, the supercooled liquid state means that the pressure of the LNG is higher than the critical pressure and the temperature is lower than the critical temperature.

Specifically, the high-pressure pump 32 pressurizes the liquid LNG discharged from the boosting pump 31 to a high pressure of 200 to 400 bar so that the temperature of the LNG becomes lower than the critical temperature, Phase change. Here, the temperature of the LNG in the subcooled liquid state may be -140 캜 to -60 캜, which is relatively lower than the critical temperature.

The heat exchanger 40 is provided on the LNG supply line 21 between the first customer 20a and the pump 30 and supplies the LNG supplied from the pump 30 to the first customer 20a at a temperature . The pump 30 for supplying the LNG to the heat exchanger 40 may be the high pressure pump 32 and the heat exchanger 40 may supply the LNG in the supercooled liquid state or the supercritical state to the high pressure pump 32 200 bar to 400 bar to convert the LNG into supercritical LNG at 30 ° C to 60 ° C and supply it to the first customer 20a.

The heat exchanger 40 can heat the LNG using the steam supplied through the boiler (not shown) or the glycol water supplied from the glycol heater (not shown), or use the electric energy to heat the LNG, Or the waste heat generated from a generator or other equipment provided on the ship can be used to heat the LNG.

The heat exchanger 40 can heat the evaporation gas supplied from the evaporation gas compressor 51 to be described later through the evaporation gas supply line 22 to a temperature required by the first consumer 20a.

The evaporation gas compressor 51 is installed in the evaporation gas supply line 22 connected to the upper part of the LNG storage tank 10 and pressurizes the evaporation gas generated in the LNG storage tank 10 at a pressure of about 10 bar, To the first customer 20a or the second customer 20b.

The plurality of evaporation gas compressors (51) are capable of multi-stage compression of the evaporation gas. For example, three evaporation gas compressors 51 may be provided to compress the evaporation gas into three stages. At this time, the two-stage compressed evaporation gas is supplied to the second consumer 20b through the low-pressure evaporation gas supply line 23 And the three-stage compressed evaporated gas can be supplied to the first demand point 20a through the LNG supply line 21 connected to the evaporation gas supply line 22. [

One end of the evaporation gas supply line 22 is connected to the upper portion of the LNG storage tank 10 and the other end is connected to the LNG supply line 21 at the upstream side of the heat exchanger 40, Thereby providing a passage for supplying the pressurized gas to the first customer 20a. The evaporation gas supply line 22 can also provide a passage for supplying the evaporation gas to the second customer 20b through the low pressure evaporation gas supply line 23 branched between the plurality of evaporation gas compressors 51 .

An opening control valve (not shown) may be provided on the connection point between the evaporation gas supply line 22 and the LNG supply line 21, and the opening control valve may be provided to the LNG supply line 21, The amount of fuel can be controlled so as to be the amount of fuel required by the first customer 20a by controlling the flow rate. That is, when the flow rate of the evaporation gas supplied through the evaporation gas supply line 22 is large, the opening degree control valve can reduce the flow rate of the LNG supplied to the first customer 20a. On the contrary, when the flow rate of the evaporation gas is small, So that the amount of fuel required by the first customer 20a can be constantly supplied.

The low-pressure evaporation gas supply line 23 is connected between a plurality of evaporation gas compressors 51 on one end of the evaporation gas supply line 22 and the other end is connected to the second demand point 20b, It is possible to provide a passage for supplying to the second customer 20b. For example, when three evaporative gas compressors 51 are provided, the low-pressure evaporative gas supply line 23 may be connected to the downstream of the second evaporative gas compressor 51 based on the flow of the evaporative gas. Accordingly, the evaporated gas compressed in the second evaporative gas compressor 51 can be branched and supplied to the second consumer 20b or the third evaporative gas compressor 51, respectively.

(Not shown) may be provided on the connection point between the low-pressure evaporation gas supply line 23 and the evaporation gas supply line 22, and the evaporation gas supply valve may be provided on the evaporation gas supply line 22, Or the flow rate of the evaporative gas supplied to the first customer 20a through the third evaporative gas compressor 51, or may be a three-way valve.

On the other hand, an evaporative gas cooler (not shown) may be provided between the plurality of evaporative gas compressors 51. When the evaporation gas is compressed by the evaporation gas compressor 51, since the temperature can also be raised in accordance with the pressure increase, the evaporation gas cooler can be used to lower the temperature of the evaporation gas again. The evaporative gas cooler may be installed in the same number as that of the evaporative gas compressor 51, and each evaporative gas cooler may be provided downstream of each evaporative gas compressor 51.

The evaporation gas compressor 51 pressurizes the evaporation gas in order to increase the liquefaction efficiency of the evaporation gas. Evaporation gas increases the boiling point when the pressure rises, which means that it can be liquefied even at relatively high temperatures. Therefore, in this embodiment, by increasing the pressure of the evaporation gas to the evaporation gas compressor 51, the evaporation gas can be easily liquefied. At this time, the evaporated gas discharged from the evaporative gas compressor 51 located at the downstream side is pressurized and pressurized by the pressure and temperature required by the first customer 20a, for example, when the first customer 20a is a high pressure engine, And the evaporation gas discharged from the evaporation gas compressor 51 located upstream of the low-pressure evaporation gas supply line 23 may have a temperature of 30 ° C to 60 ° C, and the pressure and temperature required by the second customer 20b, For example, when the second customer 20b is a low-pressure engine, it may have a pressure of 1 bar to 50 bar and a temperature of 30 ° C to 60 ° C.

The cold / hot thermal power generator 60 may be installed in the evaporative gas supply line 22 between the LNG storage tank 10 and the evaporative gas compressor 51 and may be installed in the evaporative gas compressor 51 from the LNG storage tank 10, So that heat exchange with the working fluid inside the working fluid circulation line 66 can be performed and the temperature can be raised to a temperature that can be easily compressed in the evaporative gas compressor 51. As a result, So that energy can be generated and used as a power source for the third customer 70 to be described later.

The cold / hot thermal power generator 60 includes a water feed pump 61, a vaporizer 62, a turbine 63, and a condenser 64, all of which are connected to a working fluid circulation line 66. The working fluid circulated in the working fluid circulating line 66 can be used in the meaning including not only the working fluid in the gaseous state but also the liquefied working fluid.

The feed pump 61 can be installed in a working fluid circulating line 66 between a vaporizer 62 and a condenser 64 to be described later and adiabatically compresses a working fluid supplied from a condenser 64 To the vaporizer (62).

The vaporizer 62 can be installed in the working fluid circulating line 66 between the feed pump 61 and a turbine 63 to be described later and is operable to equalize the working fluid supplied from the feed pump 61, (63). Here, the working fluid supplied from the feed pump 61 can be heated under equal pressure using an atmosphere or the like.

The turbine 63 may be installed in the working fluid circulation line 66 between the evaporator 62 and the condenser 64 to be described later and may be used to heat the working fluid supplied from the vaporizer 62 to the condenser 64 The working fluid can be supplied.

The turbine 63 can transmit the rotational energy generated by the working fluid supplied from the vaporizer 62 to the third customer 70 through the drive shaft 65 and use the rotational energy as a power source for the third customer 70 do. Here, the third customer 70 may be a generator for converting rotational energy into electrical energy.

The condenser 64 is connected to the evaporative gas supply line 22 between the LNG storage tank 10 and the evaporative gas compressor 51 and the working fluid circulation line 66 between the turbine 63 and the feed pump 61, And the working fluid supplied from the turbine 63 can be discharged to the water supply pump 61 by equipotential heat release.

The condenser 64 supplies the evaporation gas supplied from the LNG storage tank 10 to the evaporation gas compressor 51 through the evaporation gas supply line 22 and the evaporation gas supplied from the turbine 63 through the working fluid circulation line 66, The working fluid circulated to the pump 61 mutually exchanges heat so that the low temperature evaporated gas supplied to the evaporated gas compressor 51 is heated to a temperature that can be easily compressed in the evaporated gas compressor 51 And the relatively high temperature working fluid circulated to the water feed pump 61 may lose heat so that adiabatic compression can be smoothly performed by the water feed pump 61. [

Thus, in the present embodiment, the cold / hot thermal power generator 60 is installed in the evaporation gas supply line 22 between the LNG storage tank 10 and the evaporative gas compressor 51, and is discharged from the LNG storage tank 10 By raising the temperature of the evaporation gas to suit the evaporative gas compressor 51 of the system 2, the evaporative gas treatment efficiency of the system 2 can be increased, fuel can be saved, and the temperature of the LNG storage tank 10 The generated energy can be used as a power source of the third customer 70 by using the cold heat of the discharged evaporative gas as a power source of the cold / hot thermal power generator 60 to generate energy, so that the energy efficiency can be increased.

3 is a conceptual diagram of an LNG processing system according to a second embodiment of the present invention.

3, the LNG processing system 3 according to the second embodiment of the present invention includes an LNG storage tank 10, a first customer 20a, a second customer 20b, a pump 30, A heat exchanger 40, an evaporative gas compressor 51 and a cold / hot thermal power generator 60. The LNG supply line 60 between the LNG storage tank 10 and the pump 30 21 are the same as those described in the first embodiment, detailed description of each configuration will be omitted.

The cold / hot thermal power generator 60 in the second embodiment can be installed in the LNG supply line 21 between the LNG storage tank 10 and the pump 30 and can be installed in the LNG storage tank 10 from the pump 30 Can be exchanged with the working fluid in the working fluid circulation line 66 and can be raised to a temperature that can be easily compressed by the pump 30. The LNG can be cooled by using the cold heat of the LNG as a power source, To be used as a power source of the third demanding customer 70.

The cold / hot thermal power generator 60 includes a water feed pump 61, a vaporizer 62, a turbine 63, and a condenser 64, all of which are connected to a working fluid circulating line 66, The remaining configuration is the same as that described in the first embodiment except that the condenser 64 is installed in the LNG supply line 21 between the LNG storage tank 10 and the pump 30. Therefore, .

The condenser 64 in the second embodiment is provided with a working fluid circulation line 66 between the turbine 63 and the feed pump 61 and an LNG feed line between the LNG storage tank 10 and the pump 30 21, and the working fluid supplied from the turbine 63 can be supplied to the water supply pump 61 by equipotential heat release.

In the condenser 64, the LNG supplied from the LNG storage tank 10 to the pump 30 through the LNG supply line 21 and the LNG supplied from the turbine 63 to the feed pump 61 through the working fluid circulation line 66, The low-temperature LNG supplied to the pump 30 can be heated up to a temperature at which it can be easily compressed by the pump 30, and the water supplied to the water pump 61 The circulating relatively high temperature working fluid loses heat and adiabatic compression can be smoothly performed by the feed pump 61. [

Here, the pump 30 may include a boosting pump 31 and a high-pressure pump 32, wherein the condenser 64 is connected to the LNG supply line 21 between the boosting pump 31 and the high- Can be installed.

Thus, in the present embodiment, the cold / hot thermal power generator 60 is installed in the LNG supply line 21 between the LNG storage tank 10 and the pump 30, and the temperature of the LNG discharged from the LNG storage tank 10 The efficiency of the LNG treatment of the system 3 can be increased and the fuel can be saved by raising the LNG storage tank 10 to suit the pump 30 of the system 3, The generated energy can be used as a power source of the third demand site 70 by using the generated energy as a power source of the thermal power generation apparatus 60, thereby increasing the energy efficiency.

4 is a conceptual diagram of an LNG processing system according to a third embodiment of the present invention.

4, the LNG processing system 4 according to the third embodiment of the present invention includes an LNG storage tank 10, a first customer 20a, a second customer 20b, a pump 30, A heat exchanger 40, an evaporative gas compressor 51 and a cold / hot thermal power generator 60. The cold / hot thermal power generator 60 includes an LNG supply line 21 between the pump 30 and the heat exchanger 40 , The detailed description of each configuration will be omitted.

The cold / hot thermal power generator 60 in the third embodiment can be installed in the LNG supply line 21 between the pump 30 and the heat exchanger 40 and can be connected to the heat exchanger 40 The supplied LNG can be exchanged with the working fluid in the working fluid circulating line 66 so that it can be easily raised to the temperature required by the first customer 20a in the heat exchanger 40, So that energy can be generated and used as a power source of the third customer.

The cold / hot thermal power generator 60 includes a water feed pump 61, a vaporizer 62, a turbine 63, and a condenser 64, all of which are connected to a working fluid circulating line 66, Except for the fact that the condenser 64 is installed in the LNG supply line 21 between the pump 30 and the heat exchanger 40, the configuration is the same as that described in the first embodiment, do.

The condenser 64 in the third embodiment is provided with a working fluid circulation line 66 between the turbine 63 and the feed pump 61 and an LNG feed line 21 between the pump 30 and the heat exchanger 40 And can supply the working fluid supplied from the turbine 63 to the water supply pump 61 by equipotential heat release.

In the condenser 64, the LNG supplied from the pump 30 to the heat exchanger 40 through the LNG supply line 21 and the LNG supplied from the turbine 63 to the feed pump 61 through the working fluid circulating line 66 When the circulating working fluid mutually exchanges heat, the low-temperature LNG supplied to the heat exchanger 40 is heated to heat the LNG at a temperature required by the first customer 20a in the heat exchanger 40, And the relatively high temperature working fluid circulated to the water feed pump 61 loses heat, so that the adiabatic compression of the water feed pump 61 can be smoothly performed.

Here, the pump 30 may include a boosting pump 31 and a high-pressure pump 32, wherein the condenser 64 is connected to the LNG supply line 21 between the high-pressure pump 32 and the heat exchanger 40 Can be installed.

Thus, in the present embodiment, the LNG supply line 21 between the pump 30 and the heat exchanger 40 is provided with the cold / hot thermal power generator 60 to adjust the temperature of the LNG discharged from the LNG storage tank 10 to The LNG treatment efficiency of the system 4 can be increased and the fuel can be saved by raising the temperature of the heat exchanger 40 of the system 4 so as to be easily heated to the temperature required by the first customer 20a , The cold energy of the LNG discharged from the LNG storage tank 10 is used as the power source of the cold / hot thermal power generator 60 to generate energy, so that the generated energy can be used as the power source of the third customer 70, Can be increased.

5 is a conceptual diagram of an LNG processing system according to a fourth embodiment of the present invention.

5, the LNG processing system 5 according to the fourth embodiment of the present invention includes an LNG storage tank 10, a first customer 20a, a second customer 20b, a pump 30, A heat exchanger 40, an evaporative gas compressor 51 and a cold / hot thermal power generator 60. The cold / hot thermal power generator 60 includes an evaporative gas supply line 22 are the same as those described in the first embodiment, detailed description of each configuration will be omitted.

The cold / hot thermal power generator 60 in the fourth embodiment can be installed in the evaporation gas supply line 22 connecting between the plurality of evaporative gas compressors 51, and the evaporative gas compressor 51 located upstream, The evaporation gas supplied to the evaporation gas compressor 51 located downstream from the evaporation gas compressor 51 is heat-exchanged with the working fluid in the working fluid circulation line 66, The temperature of the evaporated gas can be lowered and the energy of the evaporated gas can be generated by using the heat of the evaporated gas as a power source to be used as a power source of the third customer.

The cold / hot thermal power generator 60 includes a water feed pump 61, a vaporizer 62, a turbine 63, and a condenser 64, all of which are connected to a working fluid circulating line 66, Except that the condenser 64 is not provided in the evaporation gas supply line 22 and the evaporator 62 is installed in the evaporation gas supply line 22 connecting between the plurality of evaporation gas compressors 51, Are the same as those described in the embodiment, detailed description of each constitution will be omitted.

The condenser 64 in the fourth embodiment is installed in the working fluid circulation line 66 between the turbine 63 and the feed pump 61 and is simply supplied from the turbine 63 So that the working fluid can be discharged to the water supply pump 61 by equipotential heat release. Here, the working fluid supplied from the turbine 63 can be equipotentialized by using atmosphere or the like.

The vaporizer 62 in the fourth embodiment is provided with a working fluid circulating line 66 between the feed pump 61 and the turbine 63 and an evaporating gas supply line 22, and the working fluid supplied from the feed pump 61 can be supplied to the turbine 63 by equi-pressure heating.

The evaporator 62 is provided with evaporative gas discharged from an evaporative gas compressor 51 located upstream from the evaporator 62 in the plurality of evaporative gas compressors 51, The working fluid circulated from the evaporator gas compressor 61 to the turbine 63 mutually exchanges heat so that the high temperature evaporation gas discharged from the evaporation gas compressor 51 located upstream is in an evaporated gas compressor 51 ) Or a temperature required by the second customer 20b, and the working fluid circulated to the turbine 63 is heated to obtain a smooth thermal expansion in the turbine 63 .

More specifically, the evaporator 62 is provided at the rear end of the evaporative gas compressor 51 located at the most upstream or middle position when three evaporation gas compressors are provided, for example, three evaporator gas compressors 51 are provided, Or the temperature of the two-stage compressed evaporation gas can be lowered.

The evaporator 62 is connected to the evaporation gas supply line 22 between the evaporation gas compressor 51 and the evaporation gas cooler in the case where the evaporation gas compressor (not shown) is provided between the plurality of evaporation gas compressors 51 To improve the cooling efficiency of the evaporative gas cooler, or to perform the function of the evaporative gas cooler when the evaporative gas cooler is not provided.

Accordingly, in the present embodiment, the cold / hot thermal power generator 60 is installed in the evaporation gas supply line 22 connecting the plurality of evaporative gas compressors 51, and the evaporated gas compressor 51, The temperature of the evaporation gas is lowered to a temperature required by the second customer 20b of the system 4 or to a temperature that can be easily compressed in the evaporative gas compressor 51 located downstream, The efficiency of the gas treatment can be increased and the fuel can be saved and the heat of the evaporated gas discharged from the LNG storage tank 10 and passed through the evaporative gas compressor 51 can be used as a power source for the cold / Energy can be generated so that the generated energy can be used as a power source of the third customer 70, so that the energy efficiency can be increased.

6 is a conceptual diagram of an LNG processing system according to a fifth embodiment of the present invention.

6, the LNG processing system 5 according to the fifth embodiment of the present invention includes an LNG storage tank 10, a first customer 20a, a second customer 20b, a pump 30, A heat exchanger 40, an evaporative gas compressor 51 and a cold / hot thermal power generator 60. The cold / hot thermal power generator 60 is connected to the evaporative gas compressor 51 and the heat exchanger 40, Except for being provided on the line 22, are the same as those described in the first embodiment, so that a detailed description of each configuration will be omitted.

The cold / hot heat generator 60 in the fifth embodiment can be installed in the evaporation gas supply line 22 between the evaporation gas compressor 51 and the heat exchanger 40, The evaporated gas supplied to the evaporator 40 is heat-exchanged with the working fluid in the working fluid circulating line 66 so that the temperature of the evaporated gas can be lowered while being compressed by the evaporator gas compressor 51, And the energy of the evaporated gas is used as a power source to generate energy, so that the energy can be used as a power source of the third customer.

The cold / hot thermal power generator 60 includes a water feed pump 61, a vaporizer 62, a turbine 63, and a condenser 64, all of which are connected to a working fluid circulating line 66, Except that the condenser 64 is not provided in the evaporation gas supply line 22 and the evaporator 62 is installed in the evaporation gas supply line 22 between the evaporation gas compressor 51 and the heat exchanger 40 Are the same as those described in the first embodiment, so that a detailed description of each configuration will be omitted.

The condenser 64 in the fifth embodiment is installed in the working fluid circulation line 66 between the turbine 63 and the feed pump 61 and is simply supplied from the turbine 63 So that the working fluid can be discharged to the water supply pump 61 by equipotential heat release. Here, the working fluid supplied from the turbine 63 can be equipotentialized by using atmosphere or the like.

The vaporizer 62 in the fifth embodiment is provided with a working fluid circulating line 66 between the feed pump 61 and the turbine 63 and a working fluid circulating line 66 between the evaporating gas compressor 51 and the heat exchanger 40 And the working fluid supplied from the feed pump 61 can be supplied to the turbine 63 by equi-pressure heating.

The vaporizer 62 supplies the evaporation gas supplied from the evaporation gas compressor 51 to the heat exchanger 40 through the evaporation gas supply line 22 and the evaporation gas supplied from the feed pump 61 to the turbine The working fluid circulated to the evaporator 63 is subjected to mutual heat exchange so that the high temperature evaporative gas discharged from the evaporative gas compressor 51 loses heat and evaporates at a temperature required by the first consumer 20a in the heat exchanger 40. [ The heat energy can be reduced when the gas is heated and the relatively low temperature working fluid circulated to the turbine 63 can obtain heat to smoothly perform the thermal expansion in the turbine 63. [

Specifically, the vaporizer 62 is provided at the downstream end of the evaporative gas compressor 51 located at the most downstream position when three evaporation gas compressors 51 are provided, for example, three evaporator gas compressors 51 are provided, The temperature of the evaporation gas can be lowered.

When the evaporator 62 is provided with an evaporative gas cooler (not shown) at the downstream end of the most downstream evaporative gas compressor 51, the evaporator gas compressor 51 and the evaporative gas cooler (22) to improve the cooling efficiency of the evaporative gas cooler, or to perform the function of the evaporative gas cooler when the evaporative gas cooler is not provided.

Thus, in this embodiment, the cold / hot thermal power generator 60 is installed in the evaporative gas supply line 22 between the evaporative gas compressor 51 and the heat exchanger 40, and the evaporative gas compressor 51 The evaporating gas processing efficiency of the system 4 can be reduced by lowering the temperature of the evaporation gas discharged from the evaporator 3 to the temperature required by the first consumer 20a in the heat exchanger 40 of the system 4 So that the heat of the evaporated gas discharged from the LNG storage tank 10 and passed through the evaporative gas compressor 51 is used as the power source of the cold / hot thermal power generator 60 to generate energy The generated energy can be used as a power source of the third customer 70, and the energy efficiency can be increased.

On the other hand, in the first, second and third embodiments, it has been described that the heat exchange with the cold heat of the LNG or the evaporation gas is performed in the condenser 64 of the cold / hot thermal power generator 60. In the fourth and fifth embodiments, The heat of the evaporated gas is exchanged with the heat of the evaporator 62 of the cold / hot thermal power generator 60. However, the present invention is not limited to the first, second, and third embodiments, and the fourth and fifth embodiments ≪ / RTI >

For example, when the first embodiment and the fourth embodiment are combined, the condenser 64 of the cold / hot thermal power generator 60 can supply the evaporation gas between the LNG storage tank 10 and the evaporative gas compressor 51 And the vaporizer 62 of the cold / hot thermal power generator 60 may be provided in the evaporation gas supply line 22 connecting between the plurality of evaporative gas compressors 51. In this case,

The first embodiment and the fifth embodiment, the second embodiment and the fourth embodiment, the second embodiment and the fifth embodiment, the third embodiment and the fourth embodiment, or the third embodiment and the fifth embodiment, It goes without saying that the condenser 64 and the vaporizer 62 can be disposed in the same manner as in the case of combining the first and fourth embodiments.

Thus, in this embodiment, the cold / hot thermal power generator 60 is installed in the LNG or evaporation gas supply lines 21, 22 provided between the LNG storage tank 10 and the demanders 20a, 20b, 3, 4, 5, 6) by raising or lowering the temperature of the LNG or evaporative gas discharged from the system (10, 10, 20, 30, Or the evaporative gas treatment efficiency can be increased and the fuel can be saved. Also, the LNG discharged from the LNG storage tank 10 or the waste heat of the evaporated gas can be used as the power source of the cold / By generating the energy, the generated energy can be used as a power source of the other device 70, so that the energy efficiency can be increased.

1: Conventional LNG processing system
2, 3, 4: The LNG treatment system of the present invention
10: LNG storage tank 20: Engine
20a: First demand point 20b: Second demand point
21: LNG supply line 22: evaporation gas supply line
23: low pressure evaporative gas supply line 30: pump
31: boosting pump 32: high pressure pump
40: Heat exchanger 51: Evaporative gas compressor
60: cold / hot heat generator 61: feed water pump
62: carburetor 63: turbine
64: condenser 65: drive shaft
66: working fluid circulation line 70: third demand source

Claims (11)

An LNG supply line connected from the LNG storage tank to the first customer;
A pump installed on the LNG supply line for pressurizing the LNG discharged from the LNG storage tank;
A heat exchanger provided on the LNG supply line between the first customer and the pump;
A plurality of evaporative gas compressors installed on the evaporation gas supply line for supplying the evaporated gas generated by the LNG storage tank to the first demand site; And
The evaporation gas supply line between the LNG storage tank and the evaporative gas compressor or the LNG supply line between the LNG storage tank and the pump or the LNG supply line between the pump and the heat exchanger, The low temperature LNG or the evaporation gas passing through the evaporation gas supply line or the LNG supply line is heat-exchanged with the relatively high temperature working fluid circulating along the working fluid circulation line so that the cooled working fluid rotates the turbine, And a cold / hot thermal power generation device for generating cold / hot heat. The information processing apparatus according to claim 1,
Wherein the high-pressure engine is a high-pressure engine. The method according to claim 1,
And a low-pressure evaporation gas supply line connected to the evaporation gas supply line at one end thereof between the plurality of evaporation gas compressors and at the other end thereof to a second consumer site to supply the evaporation gas to the second customer Gt; LNG < / RTI > 4. The system according to claim 3,
Wherein the low-pressure engine is a low-pressure engine. 2. The compressor according to claim 1, wherein between the plurality of evaporative gas compressors,
And an evaporative gas cooler is provided. 6. The apparatus of claim 5, wherein the evaporative gas cooler comprises:
Wherein the plurality of evaporative gas compressors are provided in the same number as the plurality of evaporative gas compressors and are provided downstream of the respective evaporative gas compressors. The apparatus according to claim 1, wherein the cold /
Wherein a feed pump, a vaporizer, the turbine, and a condenser are connected by the working fluid circulation line,
The feed pump is installed in the working fluid circulation line between the condenser and the vaporizer, and adiabatically compresses the working fluid to supply it to the vaporizer,
Wherein the vaporizer is installed in the working fluid circulation line between the feed pump and the turbine and supplies the working fluid to the turbine by isobaric heating,
Wherein the turbine is installed in the working fluid circulation line between the vaporizer and the condenser and supplies the working fluid to the condenser by thermal expansion,
Said condenser comprising: said working fluid circulation line between said turbine and said feed pump; and said evaporation gas supply line between said LNG storage tank and said evaporative gas compressor, said LNG supply line between said LNG storage tank and said pump, Or the LNG supply line between the pump and the heat exchanger, the working fluid is equipotential heat radiated to the feed pump, and the LNG or the evaporation gas is heat-exchanged with the working fluid LNG processing system. The turbine of claim 7,
And the rotational energy generated by the working fluid supplied from the carburetor is used as a power source of the third customer. 9. The system according to claim 8,
And a generator for converting the rotational energy into electric energy. 8. The pump according to claim 7, wherein the pump is a high-
Wherein the LNG supply line between the LNG storage tank and the high-
Characterized in that a boosting pump is provided. 11. The compressor according to claim 10,
The working fluid circulation line between the turbine and the feed pump and the LNG supply line between the LNG storage tank and the pump,
Wherein the LNG supply line is installed in the LNG supply line between the boosting pump and the high-pressure pump.

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