KR101528977B1 - A Treatment System of Liquefied Natural Gas - Google Patents

Abstract

The present invention relates to an LNG processing system, comprising: a plurality of evaporative gas compressors installed on an evaporative gas supply line, one end of which is connected to an LNG storage tank, for pressurizing the evaporated gas generated from the LNG storage tank to supply the evaporated gas to a first customer; And a second heat source installed in an exhaust gas discharge line of the first customer to generate steam by using a high temperature heat source of the exhaust gas discharged from the first demanding place and rotating the turbine with the generated steam, And a thermal power generation device for use as at least one of a gas compressor and a pump as a power source.
The LNG processing system according to the present invention is characterized in that a thermal generator is provided in an exhaust gas discharge line of a first customer or a second customer and a power is generated by a high temperature heat source that exhausts exhaust gas discharged from the first and second consumers , The generated power can be used as a power source of the high-pressure pump or the evaporative gas compressor, thereby not only increasing the thermal energy efficiency of the system but also reducing fuel consumption and power consumption.

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.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art as described above, and it is an object of the present invention to provide a high-temperature heat source for generating exhaust heat from exhaust gas discharged from first and second consumers, And to provide an LNG processing system which can be used as a power source of a pump or an evaporative gas compressor.

An LNG processing system according to an aspect of the present invention includes a plurality of evaporation gas supply units installed on an evaporation gas supply line connected to an LNG storage tank at one end thereof and supplying the evaporation gas generated in the LNG storage tank to a first customer, compressor; And a second heat source installed in an exhaust gas discharge line of the first customer to generate steam by using a high temperature heat source of the exhaust gas discharged from the first demanding place and rotating the turbine with the generated steam, And a gas turbine, and a gas compressor.

Specifically, an LNG supply line connected from the LNG storage tank to the first demand site; A pump installed on the LNG supply line for pressurizing the LNG discharged from the LNG storage tank; And a heat exchanger provided on the LNG supply line between the first demander and the pump.

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 heat generator is installed in an exhaust gas discharge line of the first demander or the second demander, and generates steam by using a high-temperature heat source of the exhaust gas discharged from the first demander or the second demander And supplying power generated by rotating the turbine to the generated steam to at least one of the plurality of evaporative gas compressors.

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 thermal power generation apparatus includes an economizer, a turbine, and a condenser connected to the working fluid circulating line, wherein the economizer includes the working fluid circulating line between the turbine and the condenser, Wherein the exhaust gas of the relatively high temperature discharged from the first demanding place or the second demanding place is provided in the exhaust line of the demanding place or the second demanding place so that the exhaust gas of relatively high temperature circulating along the working fluid circulating line Wherein the turbine is installed in the working fluid circulation line between the economizer and the condenser and generates power by steam of the working fluid vaporized from the economizer, Supplying a vaporized working fluid to the condenser, And supplying the liquefied working fluid to the economizer, the liquefied working fluid being installed in the working fluid circulation line between the turbine and the economizer.

Specifically, the turbine may further include transmitting the generated power to the pump to be used as a power source of the pump.

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 power generated by the turbine may be transmitted to the gearbox of the high-pressure pump.

The LNG processing system according to the present invention is characterized in that a thermal generator is provided in an exhaust gas discharge line of a first customer or a second customer and a power is generated by a high temperature heat source that exhausts exhaust gas discharged from the first and second consumers , The generated power can be used as a power source of the high-pressure pump or the evaporative gas compressor, thereby not only increasing the thermal energy efficiency of the system but also reducing fuel consumption and power consumption.

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.

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.

However, the conventional LNG processing system 1 has a problem that a high-temperature heat source generated during operation can not be utilized and is wasted and wasted heat energy, and there is a problem that power is consumed when the high-pressure pump is driven.

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 thermal 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 (e.g. 6 bar). 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.

In this embodiment, the evaporative gas generated from the LNG storage tank 10 is supplied to the evaporative gas compressor 51 to be described later, and is supplied to the second demand point 20b or a first demand point 20a Or the LNG of the LNG storage tank 10 may be supplied to the pump 30 to be described later and utilized as the fuel of the first customer 20a to be described later. The LNG of the first customer 20a or the second customer 20b A heat generator 60 to be described later is installed in the exhaust gas discharge line 24 to generate power by the high temperature heat source of the exhaust gas so that the generated power is supplied to the pump 30, 31) or the evaporative gas compressor (51).

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 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 by a few to several tens of bars, and the LNG through the booster pump 31 can be pressurized by 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.

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

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 is then primarily pressurized by the boosting pump 31. The high pressure pump 32 pressurizes the pressurized LNG in a second order, To the heat exchanger (40).

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 receive 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.

As described above, the high-pressure pump 32 that pressurizes with the pressure demanded by the first customer 20a is forced to excess power. Accordingly, a method for reducing the power consumed by the high-pressure pump 32 should be sought, and a detailed description thereof will be made through a thermal power generation apparatus 100 to be described later.

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, which will 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. [

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, the evaporation gas compressor 51, which is located downstream by lowering the temperature of the evaporation gas again by using the evaporation gas cooler, It is possible to increase the compression efficiency. 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.

Since the evaporative gas compressor 51 is required to be pressurized by the pressure demanded by the first customer 20a or the second customer 20b, the power required for driving can be excessively increased.

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, So that the compressed gas can be supplied to the first customer 20a. The evaporation gas supply line 22 can provide a passage through which the evaporation gas is supplied to the second customer 20b through the low pressure evaporation gas supply line 23 branched between the plurality of evaporation gas compressors 51 have.

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 evaporative gas compressors 51 at one end on the evaporation gas supply line 22 and the other end is connected to the second consumer 20b, It is possible to provide a passage to be supplied 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.

The thermal generator 60 may be installed in the exhaust gas discharge line 24 of the first customer 20a or the second customer 20b and may be disposed at a relatively high temperature The gas exchanges heat with the relatively low temperature working fluid circulating in the working fluid circulating line 64 in the economizer 61 to be described later so that the heated working fluid rotates the turbine 62 And makes it possible to use the generated power as a power source for driving the pump 30, in particular, the high-pressure pump 32.

The heat generator 60 includes an economizer 61, a turbine 62, and a condenser 63, all of which are connected to a working fluid circulation line 64. The working fluid circulated in the working fluid circulating line 64 can be used in the sense of including the working fluid in the gaseous state as well as the liquefied working fluid.

The economizer 61 includes an operating fluid circulating line 64 between a turbine 62 and a condenser 63 to be described later and an exhaust gas discharge line 24 of the first customer 20a or the second customer 20b And the working fluid supplied through the working fluid circulating line 64 and the exhaust gas discharged through the exhaust gas discharge line 24 are exchanged with each other so that the relative fluid to be supplied to the turbine 62 For example, water, to increase the rotational force of the turbine 62 with steam, and the relatively hot exhaust gas can be discharged to the atmosphere while the heat is lost.

The turbine 62 can be installed in the working fluid circulation line 64 between the economizer 61 and a condenser 63 to be described later and can deliver the steam supplied from the economizer 61 to the condenser 63.

The turbine 62 can generate power by the steam supplied from the economizer 61 and the generated power is transmitted to the pump 30 through the first power transmission line 621 to be supplied to the pump 30 As shown in FIG.

Specifically, the power generated by the turbine 62 can be transmitted to a gear box (not shown) of the high-pressure pump 32. [

Accordingly, in the present embodiment, the turbine 62 generates power by the high-temperature heat source that drains the exhaust gas discharged from the first or second customer 20a or 20b, So that not only the heat energy efficiency of the system 2 can be increased, but also the fuel can be saved and the power consumption can be reduced.

The condenser 63 may be installed in the working fluid circulation line 64 between the turbine 62 and the economizer 61 and may be used to liquefy the working fluid supplied from the turbine 62, ).

In the above description, the condenser 63 is described as one component of the thermal generator 60. However, the operation fluid outlet line 65 may be provided at the outlet of the turbine 62, The fluid, for example, steam can be discharged to the outside. As described above, the present embodiment can be constituted by only the economizer 61 and the turbine 62 from which the condenser 63 is excluded as a component of the thermal power generator 60. [ The heat generator 60 is composed of the economizer 61 and the turbine 62 so that the condenser 63 is not required and the demand of the working fluid circulation line 64 can be reduced, Airflow and manufacturing costs can be reduced.

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 thermal generator 60. The thermal generator 60 includes an economizer 61, a turbine 62, and a condenser 63, The rest of the constitution is the same as that described in the first embodiment except for a configuration in which the power generated by the turbine 62 is transmitted to the evaporative gas compressor 51 through the second power transmission line 622 , Detailed description of each configuration will be omitted.

The thermal generator 60 in the second embodiment can be installed in the exhaust gas discharge line 24 of the first customer 20a or the second customer 20b and can be installed in the exhaust gas discharge line 24 of the first customer 20a or the second customer 20b. Temperature power source of the exhaust gas discharged from the customer 20b using the economizer 61 and the turbine 62 and supplies the generated power to the plurality of evaporative gas compressors 51) to be used as a power source for driving the evaporative gas compressor (51).

Specifically, the power generated by the turbine 62 can be transmitted to a gear box (not shown) of the evaporative gas compressor 51.

The second power transmission line 622 in the second embodiment can be connected to at least one evaporative gas compressor 51 of the plurality of evaporative gas compressors 51 and is connected to at least two evaporative gas compressors 51 A power control device (not shown) may be provided at a branching point.

Thus, in the present embodiment, the power generated by the turbine 62 is generated by the high-temperature heat source of the exhaust gas discharged from the first or second customer 20a or 20b, It can be used as a power source so as to not only increase the thermal energy efficiency of the system 3 but also reduce fuel consumption and power consumption.

In the first embodiment of the present invention, the power generated by the turbine 62 is transmitted to the pump 30 through the first power transmission line 621. In the second embodiment of the present invention, 62 is transmitted to the pump 30 through the second power transmission line 622. The present invention is characterized in that the first power transmission line 621 is the main line and the second power transmission line 622 is the main line, The second power transmission line 621 may be subdivided from the first power transmission line 621 as another embodiment.

Although not shown, a power control device (not shown) may be provided at a point where the second power transmission line 622 is branched from the first power transmission line 621, and the power control device may be a high pressure pump 32 It is possible to control the power supplied to the evaporative gas compressor 51 to optimize the driving force of the high-pressure pump 32 or the evaporative gas compressor 51.

As described above, in the present embodiment, the heat generator device 60 is installed in the exhaust gas discharge line 24 of the first customer 20a or the second customer 20b so that the first and second consumers 20a and 20b, The generated power can be used as a power source for the high-pressure pump 32 or the evaporative gas compressor 51, and the heat energy efficiency of the system 2, 3 can be improved by the high-temperature heat source, Not only to increase fuel consumption, but also to reduce power consumption.

1: Conventional LNG processing system
2, 3: 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 24: exhaust gas discharge line
30: Pump 31: Boosting pump
32: high pressure pump 40: heat exchanger
51: Evaporative gas compressor 60:
61: Economizer 62: Turbine
63: condenser 64: working fluid circulation line
621: first power transmission line 622: second power transmission line
65: working fluid discharge line

Claims (12)

A plurality of evaporative gas compressors installed on an evaporative gas supply line, one end of which is connected to the LNG storage tank, for pressurizing the evaporated gas generated in the LNG storage tank to supply the evaporated gas to the first customer;
A low pressure evaporative gas supply line connected between the plurality of evaporative gas compressors at one end and connected to a second consumer at the other end to supply the evaporative gas to the second customer; And
And a power generator operating using the heat source of the first demander or the second demander,
And the power of the generator is used as a power source of at least one of the plurality of evaporative gas compressors. The method according to claim 1,
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; And
Further comprising a heat exchanger provided on the LNG supply line between the first customer and the pump. The method according to claim 1 or 2,
Wherein the high-pressure engine is a high-pressure engine. delete The power generation system according to claim 2,
A steam generator for generating steam by using a high-temperature heat source of the exhaust gas discharged from the first demander or the second demander, installed in an exhaust gas discharge line of the first demander or the second demander, And the power generated by rotation is supplied to at least one of the plurality of evaporative gas compressors. The information processing apparatus according to claim 1,
Wherein the low-pressure engine is a low-pressure engine. 3. The compressor according to claim 1 or 2, wherein between the plurality of evaporative gas compressors,
And an evaporative gas cooler is provided. 8. The apparatus of claim 7, 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 5,
An economizer, a turbine, and a condenser connected to a working fluid circulation line,
Wherein the economizer is provided in the working fluid circulation line between the turbine and the condenser and the exhaust gas discharge line of the first demander or the second demander, The exhaust gas at a high temperature is heat-exchanged with the relatively low-temperature working fluid circulating along the working fluid circulating line to vaporize the working fluid,
The turbine being installed in the working fluid circulation line between the economizer and the condenser, generating power from steam of the working fluid vaporized from the economizer, supplying the vaporized working fluid to the condenser,
Wherein the condenser is installed in the working fluid circulation line between the turbine and the economizer and liquefies the vaporized working fluid to supply the liquefied working fluid to the economizer. 10. The turbine of claim 9,
And delivering the generated power to the pump to be used as a power source for the pump. 11. The pump according to claim 10, 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. The turbine of claim 11, wherein the power generated by the turbine
Pressure pump is transmitted to the gear box of the high-pressure pump.

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