WO2014010033A1

WO2014010033A1 - Lng terminal, and gas and/or lng supply method for lng terminal

Info

Publication number: WO2014010033A1
Application number: PCT/JP2012/067637
Authority: WO
Inventors: 哲生国広
Original assignee: 中国電力株式会社; 東洋エンジニアリング株式会社
Priority date: 2012-07-11
Filing date: 2012-07-11
Publication date: 2014-01-16
Also published as: JPWO2014010033A1; JP5653563B2

Abstract

Provided is an LNG terminal capable of accepting a variety of LNGs such as unconventional LNG or extra light LNG and supplying gas for electric power generation, fuel gas or LNG without adding external LPG, etc. The LNG terminal (1) is provided with: LNG tanks (11a, 11b) for accepting and storing LNG; a distillation apparatus (23) for separating heavy components, which are high heat-generating components contained in LNG or vaporized gas resulting from vaporization of LNG and a storage tank (65) for storing the separated heavy components; and fuel manufacturing equipment for manufacturing LNG of adjusted heating value by adding the heavy components stored in the storage tank (65) to the LNG. After adjusting the heating value by adding heavy components stored in the storage tank (65) to the LNG, the gas is vaporized by a vaporizer (79) and delivered as municipal gas. Additionally, the LNG from which heavy components have been separated by the distillation apparatus (23) is vaporized using a vaporizer (27) and same is delivered as gas for electric power generation.

Description

LNG base, LNG base gas and / or LNG supply method

The present invention relates to an LNG base that receives and stores LNG and supplies power generation gas, city gas, and the like to a demand destination, LNG base gas, and / or an LNG supply method.

At the LNG terminal (LNG receiving terminal), LNG (liquefied natural gas) vaporized gas (NG) is supplied to the power station as power generation gas, and LNG and fuel gas are supplied to gas companies and other sources. is doing. Gas companies and the like are supplied with LNG and vaporized gas that satisfy customer requirements. If the calorific value etc. of the power generation gas fluctuates greatly, the stable operation of the gas turbine will be hindered, so that vaporized gas having a predetermined property is supplied.

The properties of LNG vary depending on the production area and LNG production process. However, since there are restrictions on the properties of LNG and vaporized gas supplied to power generation gas, gas companies, etc., the methane concentration is currently planned at the LNG terminal. LNG within the range is accepted, and acceptance of LNG with a methane concentration of around 90% mainly distributed in the market is the mainstream. When the received LNG does not satisfy a predetermined property, LNG having different properties is supplied after being blended (see, for example, Patent Document 1). In the present specification, LNG having a methane concentration of 90% means LNG in which the methane concentration in the gas is 90 vol% when LNG is vaporized into NG. The same applies hereinafter.

In the future, it is expected that acceptance of unconventional LNG and ultra-light LNG with a methane concentration of 100% will progress in order to procure flexible LNG and reduce procurement costs. Unconventional natural gas is natural gas produced from other than normal coal fields and gas fields, and tight gas, coal bed methane, and shale gas are currently commercially produced (see, for example, Non-Patent Document 1). Unconventional natural gas has a methane concentration of 90% or more, and its calorific value is lower than that of natural gas currently used.

JP 2010-1355 A

In order to accept unconventional LNG or ultra-light LNG and supply gas etc. that meet customer requirements, LNG with high calorific value (heavy LNG) containing a lot of heavy components such as ethane and propane It needs to be blended, and the amount is higher than the current situation. In the method of adjusting the calorific value by blending heavy LNG with non-conventional LNG or ultra-light LNG, there is a problem that the acceptance amount of non-conventional LNG or ultra-light LNG is limited by the amount of heavy LNG received. is there.

When accepting unconventional LNG or ultra-light LNG, a method of adjusting the calorific value by adding liquefied petroleum gas (LPG) such as propane in place of heavy LNG can be considered, but LPG is supplied to ordinary LNG bases There are no facilities, so a new installation is required.

The present invention solves the above problems with a concept different from the conventional one, accepts various LNG such as unconventional LNG or ultra-light LNG, and generates power and fuel gas, LNG without adding LPG or the like from the outside. It is an object of the present invention to provide an LNG base, an LNG base gas and / or an LNG supply method that can supply the LNG.

The present invention is an LNG base that receives and stores LNG in an LNG tank, adjusts the stored LNG to a predetermined property, and supplies it as vaporized gas, LNG, and generates methane gas or vaporized gas containing methane gas as a main component. Gas supply system for power generation that is supplied as a working gas, and a fuel supply system that supplies a calorific value adjustment gas and / or a calorific value adjustment LNG adjusted to a calorific value that can be used as city gas without supplying a heat-increasing agent from the outside And an LNG base characterized by comprising:

The LNG terminal of the present invention supplies methane gas or vaporized gas mainly composed of methane gas as power generation gas, and calorie adjustment gas and / or calorie adjustment LNG adjusted to calorific value that can be used as city gas to customers. To do. The properties of the calorie adjusting gas and / or the calorie adjusting LNG are the same as the city gas sent from the conventional LNG base, but the properties of the power generating gas are greatly different from those of the conventional power generating gas. The conventional power generation gas is a gas having a methane concentration of about 90 vol%, whereas the power generation gas sent from the LNG base of the present invention has an overwhelmingly high methane concentration. The power generation gas is a gas mainly containing methane, which contains no or almost no heavy components such as ethane and propane, so that the heavy components such as ethane and propane separated from LNG can be converted into a calorific value adjusting gas and / or It can be used as a heat-increasing agent when producing the calorie adjustment LNG. As a result, various LNG such as unconventional LNG or ultra-light LNG can be received, and power generation gas, fuel gas, and LNG can be supplied without adding LPG or the like from the outside.

In the present invention, the power generation gas is a gas turbine fuel, and is a vaporized gas whose methane concentration is controlled to a constant value.

Since methane has poor combustibility compared to ethane, propane, etc., gas containing about 10 vol% of ethane, propane, etc. in addition to methane has been used so far. However, the gas turbine can be stably operated even if the methane concentration is high as long as the gas calorie and the gas combustion rate are constant. In other words, even if the methane concentration does not contain ethane, propane, etc., and the methane concentration is 100 vol%, and even if the methane concentration contains only a small amount of ethane, propane, etc., the methane concentration is constant or the fluctuation range of the methane concentration A small gas can be used as a gas turbine fuel. The LNG base of the present invention supplies a vaporized gas having a higher methane gas concentration than the conventional gas as a power generation gas. However, since the methane concentration is controlled to a constant value, it is suitably used as a fuel for a gas turbine. can do.

In addition, the LNG base of the present invention stores a heavy fraction separating apparatus and a heavy fraction separator that separates heavy fraction, which is a highly exothermic component contained in LNG or vaporized gas obtained by vaporizing LNG, in the LNG base. A heavy fraction separation facility having a heavy fraction storage tank, and a heavy fraction separated by the heavy fraction separation device are added to a vaporized gas obtained by vaporizing LNG and / or LNG, thereby adjusting a calorific value gas and / or a calorific value. A fuel production facility for producing LNG, wherein the power generation gas is a vaporized gas obtained by vaporizing LNG from which a heavy component has been separated by the heavy component separation device, and a gas produced from the vaporized gas obtained by vaporizing LNG. It is a vaporized gas from which a heavy component has been separated by a mass separator, a vaporized gas obtained by vaporizing received LNG as it is, or a gas obtained by mixing these vaporized gases.

According to the present invention, LNG and / or LNG using a heavy component separation facility for separating heavy components, which are highly exothermic components, contained in the vaporized gas obtained by vaporizing LNG or LNG, and using the separated heavy components as a heat-increasing agent. Is added to the vaporized gas, and a fuel production facility for producing a calorie adjusting gas and / or a calorie adjusting LNG is provided, so that the calorie adjusting gas and / or the calorie adjusting LNG can be supplied without supplying a heat-increasing agent from the outside. Can be manufactured. In addition, since the vaporized gas obtained by vaporizing LNG from which heavy components have been separated and the vaporized gas from which heavy components have been separated from the vaporized gas obtained by vaporizing LNG are used as power generation gases, methane gas or methane gas is mainly used as the power generation gas. As a component, vaporized gas whose methane concentration is controlled to a constant value can be supplied. When LNG with a methane concentration of 100% is accepted, it can be vaporized as it is to generate power generation gas.

Further, in the LNG base of the present invention, the BOG generated in the LNG tank that receives and stores LNG is pressurized by a compressor, and the LNG from which the heavy component is separated by the heavy component separation device is vaporized gas, LNG A gas for generating electricity, which is mixed with a vaporized gas from which a heavy component has been separated from the vaporized gas by vaporizing the gas, a vaporized gas obtained by vaporizing the received LNG as it is, or a gas obtained by mixing these vaporized gases It is characterized by being supplied as.

BOG (boil-off gas) has been difficult to handle due to its low calorie, but in the present invention, methane gas or vaporized gas mainly composed of methane gas is supplied as power generation gas, so BOG is used for power generation. It can be suitably used as a gas.

The LNG base of the present invention comprises two or more LNG tanks in the LNG base, and LNG mixing means for mixing two or more types of LNG stored in the LNG tank at a predetermined ratio. The separation / separation facility is a common facility for each LNG tank system, and the heavy separation device is LNG mixed by the LNG mixing means or vaporized gas obtained by vaporizing LNG mixed by the LNG mixing means. It is characterized by segregation of mass.

According to the present invention, the heavy component separation apparatus can be installed so as to separate the heavy component from the LNG obtained by mixing two or more kinds of LNG stored in the LNG tank. In the case of this method, the heavy component separation facility can be used as a common facility regardless of the number of LNG tanks, so that the process configuration can be simplified.

Further, the LNG base of the present invention is characterized in that in the LNG base, the mixing of the LNG is performed by tank mixing in which LNG is mixed in the LNG tank, and line blending in which LNG is mixed in the LNG dispensing system.

The present invention can be applied to a LNG base that employs either a tank mixing system that mixes LNG in an LNG tank, a line blend system that mixes LNG in an LNG delivery system, or any other system.

In addition, the LNG base of the present invention includes two or more LNG tanks in the LNG base, and the heavy fraction separation device is provided in each LNG tank system and stores the heavy fraction. Is common to each LNG tank system.

According to the present invention, since the heavy fraction separator is provided in each LNG tank system, it is easy to receive and operate LNG.

In addition, the LNG base of the present invention includes two or more LNG tanks in the LNG base, and the LNG tank accepts only power generation LNG that can supply vaporized gas obtained by vaporizing LNG as it is as power generation gas. A LNG tank system for power generation and a non-power generation LNG tank system that accepts only LNG other than the power generation LNG, and the heavy component separation facility is installed only in the non-power generation LNG tank system And

According to the present invention, the heavy separation facility is installed only in the non-power generation LNG tank system that accepts only LNG other than the power generation LNG, and is capable of supplying vaporized gas obtained by vaporizing LNG as it is as power generation gas. Since LNG for use is not sent to the heavy separation facility, the load on the heavy separation facility is reduced, and the facility can be downsized.

Further, in the LNG base of the present invention, the heavy fraction separation device is a distillation device, a gas separation device having a gas separation membrane, a liquefaction device for cooling and liquefying the vaporized gas, and a heavy content attachment / detachment device for adsorbing and desorbing heavy matter Or it is the adsorption apparatus using a pressure swing adsorption method, It is characterized by the above-mentioned.

In the present invention, the heavy component can be separated not only from LNG but also from the vaporized gas obtained by vaporizing LNG, and the device is not limited to a specific device. It can be appropriately selected according to the scale and the like. When using a heavy component attaching / detaching device or an adsorption device using the pressure swing adsorption method, it is possible to continuously supply power generation gas, fuel gas and LNG by installing two or more units and alternately switching them.

Further, the present invention is an LNG base vaporized gas and / or LNG supply method for receiving and storing LNG in an LNG tank, adjusting the stored LNG to a predetermined property and supplying the LNG as vaporized gas, LNG, A vaporized gas containing methane gas as a main component is produced by separating LNG or a heavy component that is a highly exothermic component contained in the vaporized gas obtained by vaporizing LNG, or produced by vaporizing the received LNG as it is, or Vaporized gas produced by a method of more than seeds is mixed and manufactured, or BOG generated in the LNG tank is mixed with this gas, and the gas is supplied to the customer as power generation gas and used as city gas Vaporized gas and / or LNG adjusted to a possible calorific value is produced using the above heavy components separated without supplying a heat-increasing agent from the outside, or heat is increased from the outside. A gas and / or LNG supply method of an LNG base, characterized in that two or more of the vaporized gas and / or LNG to LNG vaporized mixture prepared without supplying the demand end to supply.

In the LNG base gas and / or LNG supply method of the present invention, a gas mainly containing methane, which contains no heavy components such as ethane and propane, is supplied as a power generation gas. A heavy component such as propane can be separated and recovered, and this can be used as a heat-increasing agent when producing a calorific adjustment gas and / or a calorific adjustment LNG. Further, in the present invention, when producing power generation gas, unlike conventional power generation gas, it is not necessary to add heavy components such as ethane and propane, and heavy LNG. Therefore, it is possible to accept various LNG such as unconventional LNG or ultra-light LNG and supply power generation gas, fuel gas and LNG without adding LPG or the like from the outside.

According to the present invention, it is possible to accept various LNG such as unconventional LNG or ultra-light LNG, and supply power generation gas, fuel gas, and LNG without adding LPG or the like from the outside. In addition, the LNG base of the present invention and the gas / or LNG supply method of the LNG base basically adjust the amount of heat by adding the heavy component separation equipment and the separated heavy component to the LNG or vaporized gas in the existing LNG base. This can be realized by additionally installing a device, and even when an existing LNG base is remodeled, the influence on the operating facilities of the LNG base can be minimized.

It is an apparatus block diagram of the LNG base 1 of 1st Embodiment of this invention. It is an apparatus block diagram of the LNG base 2 of 2nd Embodiment of this invention. It is an apparatus block diagram of the LNG base 3 of 3rd Embodiment of this invention. It is an apparatus block diagram of the LNG base 4 of 4th Embodiment of this invention. It is an apparatus block diagram of the LNG base 5 of 5th Embodiment of this invention.

FIG. 1 is a device configuration diagram of the LNG base 1 according to the first embodiment of the present invention. The LNG base 1 includes a power generation gas supply system, and supplies methane gas or a vaporized gas mainly composed of methane gas as a power generation gas, and also includes a fuel supply system without supplying a heat-increasing agent from the outside. A calorific value adjusting gas and / or a calorific value adjusting LNG adjusted to a calorific value usable as gas is supplied. In the present embodiment, the power generation gas is supplied as fuel for the gas turbine.

The LNG base 1 includes two

LNG tanks

11a and 11b, and receives and stores the LNG carried by the LNG tanker (not shown) via the unloading arm 13. The LNG to be accepted is not limited to a specific LNG, but accepts a conventional LNG having a methane concentration of about 90 vol%, an unconventional LNG having a methane concentration of 90 vol% or more, and an ultralight LNG having a methane concentration of 100 vol%. be able to.

The types of LNG to be received are not limited in the two

LNG tanks

11a and 11b. For this reason, when the conventional LNG being stored is consumed in the LNG tank 11a, the non-conventional LNG may be accepted next time. The same applies to the LNG tank 11b.

LNG discharge lines

15a and 15b are connected to the

LNG tanks

11a and 11b, respectively, and in the middle of the

LNG discharge lines

15a and 15b, the LNG pumps 17a and 17b for boosting the LNG are further supplied to the discharge side of the LNG pumps 17a and 17b.

Flow control valves

19a and 19b are provided. The

LNG payout lines

15 a and 15 b merge on the downstream side of the

flow control valves

19 a and 19 b to become a mixing line 21.

The

flow control valves

19a and 19b and the mixing line 21 function as a mixing unit that blends LNG discharged from the LNG tank 11a and LNG discharged from the LNG tank 11b at a predetermined ratio, and here, two types of LNG are line-blended. be able to.

The mixing line 21 is connected to the distillation apparatus 23, and sends LNG blended with LNG discharged from the LNG tank 11a, LNG discharged from the LNG tank 11b, and LNG of the two

LNG tanks

11a and 11b to the distillation apparatus 23. .

The distillation apparatus 23 distills LNG sent from the mixing line 21 at a predetermined temperature and pressure, and separates it into heavy components such as methane, ethane, propane, and butane. The degree of separation between methane and heavy components, and the concentration of heavy components contained in separated methane will be described later. As the distillation apparatus 23, a known distillation apparatus can be used, and the specification of the distillation column, the configuration of the equipment, and the like are not limited to specific ones, depending on the degree of separation between methane and heavy components. Can be determined as appropriate. Methane separated by the distillation device 23 is sent to the vaporizer 27 via the upper line 25. On the other hand, heavy components such as ethane, propane, and butane are sent to the storage tank 65 via the lower line 41 and stored therein.

The vaporizer 27 is a device that completely vaporizes or heats methane delivered from the distillation tower 23. As the vaporizer 27, an open rack vaporizer (ORV) or a submerged vaporizer (SMV) using seawater as a heating medium generally used at an LNG base can be used. If the methane discharged from the distillation apparatus 23 is a gas, a heater may be used. Here, the methane discharged from the distillation apparatus 23 may be completely gasified and heated to a predetermined temperature, and is not limited to the names of the vaporizer and the heater.

The methane gas completely gasified by the vaporizer 27 and heated to a predetermined temperature is supplied to the power plant through the gas line 29 as a power generation gas. The power generation gas is used as fuel for the gas turbine 101.

A BOG (boil-off gas) line 55 is connected to the gas line 29, and BOG generated in the

LNG tanks

11a and 11b is mixed with methane gas from which heavy components have been separated by the distillation apparatus 23 as a power generation gas. BOG is a gas in which part of the LNG stored in the

LNG tanks

11a and 11b is evaporated by heat input from the outside, and the component has a methane concentration of approximately 100 vol%. The BOG lines 51 a and 51 b connected to the gas phase portions of the

LNG tanks

11 a and 11 b are connected to the BOG line 55 through the BOG compressor 53, and the BOG is pressurized by the BOG compressor 53 and sent to the gas line 29.

The branch line 61 is connected to the mixing line 21 in the middle of the line. The branch line 61 is connected to the heat quantity adjusting device 63 and sends a part of the LNG flowing through the mixing line 21 to the heat quantity adjusting device 63. The mixing line 21 is provided with a flow rate adjusting valve 22 that adjusts the amount of LNG to be sent to the distillation apparatus 23 on the downstream side of the position where the branch line 61 is connected. Similarly, the branch line 61 is also provided with a flow rate adjusting valve 62 that adjusts the amount of LNG sent to the heat amount adjusting device 63.

The calorific value adjusting device 63 is a device for adjusting the calorific value of LNG sent via the branch line 61 to the same calorific value as that of the city gas (13A). The heat quantity adjusting device 63 is connected to a heat increasing agent supply line 71 in which a heat increasing agent supply pump 67 and a flow rate adjusting valve 69 are interposed. A calorimeter 73 capable of measuring the amount of heat is installed at the outlet of the calorific value adjusting device 63, and a heavy component stored in the storage tank 65 is supplied as a heat-increasing agent via the heat-increasing agent supply line 71 as necessary. Is done.

LNG having the heat quantity adjusted by the heat quantity adjusting device 63 is sent to the tank truck shipping place through the fuel line 75 and shipped to the customer through the tank truck. Most of the LNG with the adjusted amount of heat is vaporized by the vaporizer 79 and sent to the customer through the city gas line 77 as city gas (13A).

As described above, the LNG base 1 of the first embodiment includes the

LNG tanks

11a and 11b, the

LNG discharge lines

15a and 15b, the mixing line 21, the distillation device 23, the upper line 25, the vaporizer 27, the gas line 29, and further to this. A

BOG line

51a, 51b, 55 connected to the power generation gas supply system is configured. Further, a fuel production facility is constituted by a heat-increasing agent supply system composed of a calorific value adjusting device 63, a storage tank 65, a heat-increasing agent supply line 71 and the like, and a calorimeter 73, and further, the fuel production facility, the

LNG tanks

11a, 11b, The

LNG payout lines

15a and 15b, the mixing line 21, the branch line 61, the fuel line 75, the city gas line 77, and the carburetor 79 constitute a fuel supply system.

In the LNG terminal 1, methane gas or vaporized gas whose main component is methane gas and whose methane concentration is controlled to a constant value is supplied to the gas turbine 101 as power generation gas. If the methane concentration of the vaporized gas that can be used as power generation gas is indicated by a numerical value, the lower limit value is about 96 vol%, and the upper limit value is 100 vol%.

The methane concentration of the vaporized gas that can be used as the power generation gas is determined in terms of the operability of the gas turbine 101 and the securing of heavy components necessary for the production of city gas and the like. Since methane is less combustible than ethane, propane, etc., if only the operability of the gas turbine 101 is considered, a gas containing about 10 vol% of ethane, propane, etc. in addition to methane is considered, as in the case of conventional gas turbine fuel. Is preferred. On the other hand, if the vaporized gas containing a large amount of heavy components such as ethane and propane is used as a power generation gas, the heavy components necessary for the production of city gas cannot be secured.

Here, the above problem is solved by using methane gas or vaporized gas whose main component is methane gas and whose methane concentration is controlled to a constant value as fuel for the gas turbine. Methane has poor combustibility compared to ethane, propane, and the like, but the gas turbine can be stably operated even if the methane concentration is high as long as the gas calorie and the gas combustion rate are constant. In other words, even if the methane concentration does not contain ethane, propane, etc., and the methane concentration is 100 vol%, and even if the methane concentration contains only a small amount of ethane, propane, etc., the methane concentration is constant or the fluctuation range of the methane concentration A small gas can be used as a gas turbine fuel.

The fluctuation range of the methane concentration is determined by the gas turbine to be used, but if the fluctuation range is exemplified, it is about ± 1%. Therefore, if an example of the vaporization gas supplied as a fuel of a gas turbine is shown, it will be a vaporization gas with a methane concentration of 98% ± 1%.

The more heavy components to be separated and recovered, the more various LNG can be accepted. However, the higher the degree of separation of heavy components contained in LNG, the more strict the specifications of the distillation apparatus and the greater the load. In addition, when LNG with 99% methane is accepted, it is difficult to say that it is efficient to set the methane concentration to 100%. In an LNG base that accepts a large amount of LNG of 99% methane, it is efficient to vaporize this as it is to generate power.

BOG is also mixed in the vaporized gas used for power generation gas. The amount of BOG generated is small compared to the flow rate of methane from which the heavy component discharged from the distillation apparatus 23 is separated, so the influence on the power generation gas is small, but BOG is a gas with a methane concentration of approximately 100 vol%. Therefore, when the concentration of methane from which the heavy components discharged from the distillation apparatus 23 are separated is 97 vol%, the methane concentration of the power generation gas varies when the amount of generated BOG varies. It is necessary to keep.

BOG has been difficult to handle due to its low calorie, but here, methane gas or vaporized gas mainly composed of methane gas is supplied as power generation gas. Therefore, BOG is preferably used as power generation gas. Can do.

From the above, the methane concentration of the vaporized gas that can be used as the power generation gas is 96 vol%, preferably 97 vol%, more preferably 98 to 100 vol%. The concept of power generation gas described above is the same in the LNG bases of the second to fifth embodiments described later.

Next, a typical operation method of the LNG base 1 will be described. The operation method shown below is a representative example, and the operation method of the LNG base 1 is not limited to the following operation method and numerical values. Since the LNG with the adjusted amount of heat is also produced at the same time as the city gas (13A), the production of the city gas (13A) includes the production of LNG with the adjusted amount of heat. BOG is mixed with vaporized gas and sent out as power generation gas. The same applies to other embodiments.

Case 1: It is assumed that LNG having a methane concentration of about 95% is stored in the LNG tank 11a, and LNG having a methane concentration of about 90% is stored in the LNG tank 11b. The city gas is a vaporized gas having a calorific value of 46 MJ / m ³ N. The composition of the gas having a calorific value of 46 MJ / m ³ N is about 88 vol% of methane concentration and ethane, propane and butane as other components. It is assumed that heavy components such as ethane, propane, and butane are stored in the storage tank 65.

When the LNG stored in the LNG tank 11a is used to produce power generation gas and city gas (13A), the distillation apparatus 23 and the calorific value adjustment apparatus 63 are connected via the LNG discharge line 15a, the mixing line 21, and the branch line 61. Send LNG. The power generation gas is separated into heavy components contained in the LNG by the distillation device 23 so as to have a methane concentration of 98% or more, and then gasified or heated by the vaporizer 27 and sent as a power generation gas.

The LNG stored in the LNG tank 11a has a methane concentration of about 95%, and since the calorific value is insufficient for the city gas, the LNG stored in the LNG tank 11a can be vaporized as it is and sent as city gas. Can not. Therefore, the heavy component is supplied to the calorific value adjusting device 63 through the heat-increasing agent supply line 71 so that the calorific value becomes a predetermined calorific value, and the heavy component is added to LNG. This is vaporized by the vaporizer 79 and sent out as city gas.

When the LNG stored in the LNG tank 11b is used to produce power generation gas and city gas, the LNG stored in the LNG tank 11a is also used when the LNG stored in the LNG tank 11a and the LNG tank 11b is used simultaneously. Just think like the time.

Case 2: It is assumed that LNG having a methane concentration of about 95% is stored in the LNG tank 11a, and LNG having a methane concentration of 100% is stored in the LNG tank 11b. Others are the same as those in Case 1.

A procedure for producing power generation gas and city gas using LNG stored in the LNG tank 11b will be described. LNG is sent to the distillation apparatus 23 and the calorific value adjustment apparatus 63 via the LNG delivery line 15 b, the mixing line 21, and the branch line 61. Since this LNG does not contain heavy components, the LNG sent to the distillation apparatus 23 is discharged as it is from the top of the column. This is gasified or heated by the vaporizer 27 and sent as power generation gas.

The LNG stored in the LNG tank 11b has a methane concentration of 100%, and since the calorific value is insufficient for the city gas, the LNG stored in the LNG tank 11b cannot be directly vaporized and sent out as city gas. . In the case of LNG having a methane concentration of 100%, the heavy component cannot be recovered even if it passes through the distillation device 23. However, since this LNG base 1 is provided with a storage tank 65 for storing the heavy component, the storage tank City gas is produced from heavy components stored in 65 and LNG having a methane concentration of 100%.

Case 3: LNG having a methane concentration of about 95% is stored in the LNG tank 11a, and LNG having a methane concentration of 85% is stored in the LNG tank 11b. Others are the same as in case 1.

LNG stored in the LNG tank 11b has a methane concentration of 85%, and even if it is vaporized as it is, it cannot be used not only as a power generation gas but also as city gas. Therefore, the LNG in the LNG tank 11a and the LNG in the LNG tank 11b are line blended so that the calorific value of the LNG is the same as that of the city gas, and the power generation gas and the city gas are produced using the LNG.

The blended LNG produces power generation gas in the same manner as the LNG with 95% methane concentration shown in Case 1. City gas sends out gas which vaporized blended LNG. In this case, since it is not necessary to add heavy components to the production of city gas, the heavy components separated by the distillation apparatus 23 are stored in the storage tank 65 as they are.

As described above, the LNG base 1 of the first embodiment includes the two

LNG tanks

11a and 11b, the mixing means for blending two or more types of LNG, the distillation apparatus 23 for separating heavy components from the LNG, and the storage tank 65. It is equipped with a heavy component separation facility that is configured, and a fuel production facility that produces vaporized gas with adjusted calorie such as city gas and LNG, so it can accept LNG of various properties and perform various operations and operations. be able to.

In the above-described embodiment, the heavy component separated by the distillation device 23 is stored in the storage tank 65 as a liquid, and the liquid heavy component is supplied to the calorific value adjusting device 63. May be stored in a gas state, and the heavy component may be supplied to the calorific value adjustment device 63 in a gas state. Further, a line for bypassing the distillation apparatus 23 may be provided, and when LNG having a predetermined methane concentration is received, the LNG may be directly sent to the vaporizer 27 to be vaporized. Note that the number of LNG tanks is not limited to two.

FIG. 2 is a device configuration diagram of the LNG base 2 according to the second embodiment of the present invention. The same components as those of the LNG base 1 according to the first embodiment shown in FIG.

The LNG base 2 of the second embodiment is an LNG base constructed based on the same technical idea as that of the LNG base 1 of the first embodiment. Like the LNG base 1 of the first embodiment, methane gas or methane gas is used. A power generation gas supply system that supplies vaporized gas as a main component as a power generation gas, and a heat amount adjustment gas and / or heat amount adjustment adjusted to a heat amount that can be used as city gas without supplying a heat-increasing agent from the outside. And a fuel supply system for supplying LNG.

The LNG to be accepted is not limited to a specific LNG, but accepts a conventional LNG having a methane concentration of about 90 vol%, an unconventional LNG having a methane concentration of 90 vol% or more, and an ultralight LNG having a methane concentration of 100 vol%. be able to. The two

LNG tanks

11a and 11b are not limited in the type of LNG to be received. For this reason, when the conventional LNG being stored is consumed in the LNG tank 11a, the non-conventional LNG may be accepted next time. The same applies to the LNG tank 11b.

The LNG base 2 has the same basic configuration as the LNG base 1, but in the case of the LNG base 1, the LNG base 2 has one distillation device 23, whereas the LNG base 2 has a distillation device 23a in each tank system. The difference is that 23b is installed. The tank system refers to a system directly related to LNG stored in the LNG tank. In the case of the system of the LNG tank 11a, the LNG tank 11a, the LNG discharge line 15a, the bypass line 31a, the BOG line 51a, and the branch line 61a are included. .

The LNG payout line 15a connected to the LNG tank 11a is directly connected to the distillation apparatus 23a at the end. The LNG payout line 15a is provided with a bypass line 31a that bypasses the distillation apparatus 23a downstream of the flow rate control valve 19a, and the bypass line 31a is connected to the upper line 25a.

On-off

valves

30a, 32a, and 24a are provided in the middle of the LNG delivery line 15a, the bypass line 31a, and the upper line 25a on the downstream side of the point where the bypass line 31a is connected. Further, a branch line 61a for sending LNG to the heat quantity adjusting device 63 is connected to the LNG delivery line 15a downstream of the point where the bypass line 31a is connected and upstream of the on-off valve 30a.

Since the system of the LNG tank 11b has the same configuration, the description thereof is omitted. In FIG. 2, the subscript b is added to distinguish from the system of the LNG tank 11a. A storage tank 65 for storing heavy components is shared by the

LNG tanks

11a and 11b.

Further, a communication line 33 for connecting the LNG payout line 15a and the LNG payout line 15b is provided downstream of the flow

rate control valves

19a and 19b and upstream of the point where the

bypass lines

31a and 31b are connected. The communication line 33 includes an on-off valve 34 in the middle of the line.

As described above, the LNG base 2 of the second embodiment includes the

LNG tanks

11a and 11b, the

LNG discharge lines

15a and 15b, the communication line 33, the

distillation devices

23a and 23b, the

upper lines

25a and 25b, the

bypass lines

31a and 31b, and the vaporization. The generator 27, the gas line 29, and the

BOG lines

51a, 51b, 55 connected thereto constitute a power generation gas supply system. Further, a fuel production facility is constituted by a heat-increasing agent supply system composed of a calorific value adjusting device 63, a storage tank 65, a heat-increasing agent supply line 71 and the like, and a calorimeter 73, and further, the fuel production facility, the

LNG tanks

11a, 11b, The

LNG delivery lines

15a and 15b, the communication line 33, the

branch lines

61a and 61b, the fuel line 75, the city gas line 77, and the carburetor 79 constitute a fuel supply system.

Next, a typical operation method of the LNG base 2 will be described. The operation methods shown below are representative examples, and the operation method of the LNG base 2 is not limited to the following operation methods and numerical values.

When the LNG stored in the LNG tank 11a is used to produce power generation gas and city gas, the LNG is sent to the distillation device 23a and the calorific value adjustment device 63 via the LNG discharge line 15a and the branch line 61a. At this time, the bypass line 31a is closed. The power generation gas is separated into heavy components contained in LNG by the distillation device 23a so as to have a methane concentration of 98% or more, then gasified or heated by the vaporizer 27, and sent as power generation gas.

The LNG stored in the LNG tank 11a does not generate enough heat to produce city gas. Therefore, the heavy quantity is supplied to the heat quantity adjusting device 63 through the heat-increasing agent supply line 71 so that the heat generation amount becomes a predetermined heat generation amount. Feed and add heavy to LNG. This is vaporized by the vaporizer 79 and sent out as city gas. The production of power generation gas and city gas using LNG stored in the LNG tank 11b may be considered in the same manner as when LNG stored in the LNG tank 11a is used. As described above, these operation methods are the same as the operation method of case 1 of the first embodiment.

Hereinafter, the procedure for producing power generation gas and city gas by using LNG stored in the two

LNG tanks

11a and 11b at the same time will be described. Here, the LNG stored in the LNG tank 11a is dedicated to the production of city gas, and the LNG stored in the LNG tank 11b is dedicated to the power generation gas.

The LNG stored in the LNG tank 11a sends LNG to the heat quantity adjusting device 63 through the payout line 15a and the branch line 61a, and supplies a heavy component to the heat quantity adjusting device 63 through the heat-increasing agent supply line 71 to adjust the calorific value. At this time, the discharge line 15a and the bypass line 31a leading to the distillation device 23a are closed.

Since the LNG stored in the LNG tank 11b has a methane concentration of 100%, the LNG is sent to the vaporizer 27 through the LNG discharge line 15b and the bypass line 31b, vaporized, and then sent as a power generation gas. At this time, the discharge line 15b and the branch line 61b leading to the distillation apparatus 23b are closed.

In the case 2, the LNG stored in the LNG tank 11a may not be exclusively used for city gas, and the city gas and the power generation gas may be produced in the same manner as in case 1. Similarly to the first embodiment, the LNG stored in the LNG tank 11a and the LNG stored in the LNG tank 11b are mixed via the communication line 33, and city gas and power generation gas are mixed in the same manner as in the first embodiment. You may make it manufacture.

LNG stored in the LNG tank 11b has a methane concentration of 85%, and even if it is vaporized as it is, it cannot be used not only as a power generation gas but also as city gas. For this reason, the LNG in the LNG tank 11a and the LNG in the LNG tank 11b are line-blended via the connection line 33 so that the calorific value of the LNG is the same as that of the city gas, and this LNG is used as a gas for city gas. .

The power generation gas may be manufactured using blended LNG, but may be manufactured as described in Case 1 using LNG stored in the LNG tank 11a having a high methane concentration. In this case, since it is not necessary to add heavy components to the production of city gas, the heavy components separated by the distillation apparatus 23a are stored in the storage tank 65 as they are.

As described above, since the LNG base 2 of the second embodiment is provided with the

distillation devices

23a and 23b in each tank system, various operations can be performed over the LNG base 1 of the first embodiment. In addition, LNG with various properties can be accepted and various operations can be performed.

In the above embodiment, the heavy component separated by the

distillation devices

23a and 23b is stored in the storage tank 65 as a liquid, and the heavy component in the liquid state is supplied to the calorific value adjusting device 63. The mass may be stored in a gas state, and the heavy component may be supplied to the calorie adjustment device 63 in a gas state. The number of LNG tanks is not limited to two.

FIG. 3 is a device configuration diagram of the LNG base 3 according to the third embodiment of the present invention. The same components as those of the LNG base 1 of the first embodiment shown in FIG. 1 and the LNG base 2 of the second embodiment shown in FIG.

The LNG base 3 of the third embodiment is an LNG base constructed based on the same technical idea as the LNG base 1 of the first embodiment, and the LNG base 1 of the first embodiment and the LNG base of the second embodiment. As in 2, power generation gas supply system that supplies methane gas or vaporized gas mainly composed of methane gas as power generation gas, and the amount of heat that can be used as city gas without supplying a heat-increasing agent from the outside. And a fuel supply system for supplying the calorific value adjustment gas and / or the calorific value adjustment LNG.

The LNG to be accepted is not limited to a specific LNG, but accepts a conventional LNG having a methane concentration of about 90 vol%, an unconventional LNG having a methane concentration of 90 vol% or more, and an ultralight LNG having a methane concentration of 100 vol%. be able to. However, the LNG base 3 is different from the LNG base 1 of the first embodiment and the LNG base 2 of the second embodiment, and since the types of LNG to be received in the

LNG tanks

11a and 11b are specified, the system is connected to the LNG base 1 and the LNG base 1. Slightly different from Base 2.

The LNG tank 11a is a tank dedicated to LNG having a methane concentration of 98% or more, and the LNG discharge line 15a is not connected to the distillation apparatus 23 but directly connected to the vaporizer 27. The LNG tank 11b is a tank that exclusively receives LNG having a methane concentration of less than 98%, and the methane concentration in the LNG is not particularly limited as long as the LNG has a methane concentration of less than 98%. The LNG payout line 15b of the LNG tank 11b is connected to the distillation device 23, and the payout line 15b is connected to a branch line 61 that sends LNG to the calorific value adjustment device 63.

Further, the LNG payout line 15a and the LNG payout line 15b are connected by a mixing line 35 in which a flow rate adjusting valve 36 is interposed. The mixing line 35 is a line for sending LNG stored in the LNG tank 11a to the payout line 11b.

When the LNG received in the LNG tank 11b does not have a calorific value equivalent to city gas (13A), an operation for adjusting the calorific value is required. When the amount of heat generated by LNG is less than or equal to the city gas (13A), the amount of heat generated can be adjusted by supplying the heat-increasing agent through the heat-increasing agent supply line 71. On the other hand, when the calorific value of LNG is equal to or greater than that of city gas (13A), the calorific value is adjusted by supplying LNG having a methane concentration of 98% or more from the mixing line 35 in order to reduce the calorific value. Therefore, when only LNG having a calorific value equal to or less than the city gas (13A) is received, the mixing line 35 may not be provided.

As described above, the LNG base 3 of the third embodiment includes the

LNG tanks

11a and 11b, the

LNG discharge lines

15a and 15b, the distillation device 23, the upper line 25, the vaporizer 27, the gas line 29, the mixing line 35, and further to this. A

BOG line

LNG tanks

11a, 11b, The

LNG payout lines

15a and 15b, the mixing line 35, the branch line 61, the fuel line 75, the city gas line 77, and the carburetor 79 constitute a fuel supply system.

Next, a typical operation method of the LNG base 3 will be described. The operation methods shown below are representative examples, and the operation method of the LNG base 3 is not limited to the following operation methods and numerical values.

Since LNG having a methane concentration of 98% or more is stored in the LNG tank 11a, it is vaporized by the vaporizer 27 and used as a power generation gas. City gas is basically produced using LNG in the LNG tank 11b. For example, in the case of LNG having a methane concentration of 90%, it can be manufactured in the same manner as in case 1 of the first embodiment. When the calorific value of LNG exceeds the calorific value of city gas, such as when the LNG concentration of LNG in LNG tank 11b is 85%, city gas is produced by adding LNG in LNG tank 11a through mixing line 35. When city gas is produced using the LNG in the LNG tank 11a, the LNG in the LNG tank 11a may be sent to the LNG delivery line 15b and further to the branch line 61 through the mixing line 35.

As described above, the LNG base 3 of the third embodiment is provided with the LNG tank 11a that exclusively receives LNG having a methane concentration of 98% or more, and specifies the LNG that is received in the

LNG tanks

11a and 11b. It is small and the process flow is simple.

In the above-described embodiment, the heavy component separated by the distillation device 23 is stored in the storage tank 65 as a liquid, and the liquid heavy component is supplied to the calorific value adjusting device 63. May be stored in a gas state, and the heavy component may be supplied to the calorific value adjustment device 63 in a gas state. The number of LNG tanks is not limited to two.

FIG. 4 is a device configuration diagram of the LNG base 4 according to the fourth embodiment of the present invention. The same components as those of the

LNG bases

1, 2, and 3 shown in FIGS. 1 to 3 are denoted by the same reference numerals and description thereof is omitted.

The LNG base 4 of the fourth embodiment is an LNG base constructed based on the same technical idea as the LNG base 1 of the first embodiment, and the

LNG bases

1, 2, 3 of the first to third embodiments Similarly, power generation gas supply system that supplies methane gas or vaporized gas mainly composed of methane gas as power generation gas, and the amount of heat adjusted to the amount of heat that can be used as city gas without supplying a heat increasing agent from the outside And a fuel supply system that supplies the adjustment gas and / or the calorie adjustment LNG.

LNG tanks

The LNG base 4 has the same basic configuration as the LNG base 1, but in the case of the LNG base 1, the distillation apparatus 23 is used as a means for separating and collecting heavy components contained in the LNG. On the other hand, the LNG base 4 uses the heavy

component adsorption devices

39a and 39b as means for separating and collecting the heavy component contained in the LNG. In the present embodiment, the heavy component separation equipment is configured with the heavy

component adsorption devices

39a and 39b and the gas tank 66 as main devices.

The heavy

component adsorption devices

39a and 39b store therein an adsorbent that adsorbs heavy components such as ethane, propane, and butane, and adsorb heavy components contained in LNG sent through the

mixing lines

37a and 37b. LNG from which heavy components have been separated is discharged. The adsorbent that has adsorbed the heavy component desorbs the heavy component when the pressure is decreased and / or the temperature is increased. A known adsorbent can be used as the adsorbent, and activated carbon is exemplified as the adsorbent.

Since the heavy

component adsorption devices

39a and 39b are used while alternately repeating the adsorption and desorption (regeneration) of the heavy component, one heavy component adsorption device can continuously supply power generation gas and city gas. I can't do it. Therefore, in the LNG base 4, when two heavy

component adsorption devices

39a and 39b are installed and one heavy component adsorption device 39a (39b) is configured to adsorb the heavy component, the other heavy component adsorption device 39b (39a) is configured so as to desorb heavy components, thereby enabling continuous supply of power generation gas and city gas.

The mixing lines 37a and 37b are connected to the lower portions of the heavy

component adsorption devices

39a and 39b, respectively.

Upper lines

25a and 25b for sending LNG from which heavy components have been separated to the vaporizer 27 are provided at the tops of the heavy

component adsorption devices

39a and 39b, and lower lines for delivering the desorbed heavy components to the gas tank 66 at the bottoms. 41a and 41b are connected. The gas tank 66 stores the heavy components sent from the heavy

component adsorption devices

39a and 39b.

Since the heavy

component adsorption devices

39a and 39b are used by alternately repeating heavy component adsorption and desorption (regeneration), the

mixing lines

37a and 37b, the

upper lines

25a and 25b, and the

lower lines

41a and 41b include On-off

valves

38a, 38b, 24a, 24b, 42a, 42b are provided. The on-off

valves

38a, 38b, 24a, 24b, 42a, 42b are opened and closed in accordance with the heavy component adsorption operation and desorption (regeneration) operation of the heavy

component adsorption devices

39a, 39b.

As described above, the LNG base 4 of the fourth embodiment includes the

LNG tanks

11a and 11b, the

LNG discharge lines

15a and 15b, the mixing lines 21, 37a and 37b, the heavy

component adsorption devices

39a and 39b, the

upper lines

25a and 25b, A gas generation system for power generation is configured by the vaporizer 27, the gas line 29, and the

BOG lines

51a, 51b, and 55 connected thereto. Further, a heat production agent supply system constituted by a heat quantity adjusting device 63, a gas tank 66, a heat increase agent supply line 71, and the like, and a calorimeter 73 constitute a fuel production facility. Further, the fuel production facility, and

further LNG tanks

11a, 11b, The

LNG payout lines

Next, a typical operation method of the LNG base 4 will be described. The operation methods shown below are representative examples, and the operation method of the LNG base 4 is not limited to the following operation methods and numerical values.

Case 1: It is assumed that LNG having a methane concentration of about 95% is stored in the LNG tank 11a, and LNG having a methane concentration of about 90% is stored in the LNG tank 11b. The city gas is a vaporized gas having a calorific value of 46 MJ / m ³ N. The composition of the gas having a calorific value of 46 MJ / m ³ N is about 88 vol% of methane concentration and ethane, propane and butane as other components. Further, it is assumed that heavy components such as ethane, propane, and butane are stored in the gas tank 66.

When the LNG stored in the LNG tank 11a is used to produce power generation gas and city gas, the heavy component adsorbing device 39a and the calorific value adjusting device via the LNG discharge line 15a, the mixing lines 21, 37a and the branch line 61 are used. LNG is sent to 63. The power generation gas is separated from the heavy component contained in the LNG by the heavy component adsorption device 39a so as to have a methane concentration of 98% or more, then gasified or heated by the vaporizer 27, and sent as a power generation gas.

After the supply to the heavy component adsorption device 39a has elapsed for a predetermined time, the supply of LNG to the heavy component adsorption device 39a is stopped and the LNG is supplied to the heavy component adsorption device 39b. At the time of this switching operation, after supplying LNG to the heavy component adsorption device 39b so that the flow rate and pressure of the power generation gas do not fluctuate, LNG to the heavy component adsorption device 39a is stopped. The heavy component adsorption device 39a is regenerated while producing the power generation gas using the heavy component adsorption device 39b. The regeneration of the heavy component adsorption device 39a is performed by depressurizing and / or heating the pressure while the supply of LNG is stopped to desorb the heavy component adsorbed on the adsorbent.

A procedure for producing power generation gas and city gas using LNG stored in the LNG tank 11b will be described. LNG is sent to the heavy component adsorption device 39b and the calorific value adjustment device 63 via the LNG delivery line 15b, the

mixing lines

21 and 37b, and the branch line 61. Since this LNG does not contain a heavy component, the LNG sent to the heavy component adsorbing device 39b is discharged as it is from the top of the column. This is gasified or heated by the vaporizer 27 and sent as power generation gas.

The LNG stored in the LNG tank 11b has a methane concentration of 100%, and since the calorific value is insufficient for the city gas, the LNG stored in the LNG tank 11b cannot be directly vaporized and sent out as city gas. . In the case of LNG having a methane concentration of 100%, the heavy component cannot be recovered even if it passes through the heavy component adsorbing device 39b, but the LNG base 4 includes a gas tank 66 for storing the heavy component. City gas is produced from heavy components stored in the gas tank 66 and LNG having a methane concentration of 100%.

The LNG stored in the LNG tank 11b has a methane concentration of 85%, and even if it is vaporized as it is, it cannot be used as a gas for city gas as well as for power generation. Therefore, the LNG in the LNG tank 11a and the LNG in the LNG tank 11b are line blended so that the calorific value of the LNG is the same as that of the city gas, and the power generation gas and the city gas are produced using the LNG.

The blended LNG produces power generation gas in the same manner as the LNG with 95% methane concentration shown in Case 1. City gas sends out gas which vaporized blended LNG. In this case, since it is not necessary to add heavy components to the production of city gas, the heavy components separated by the heavy

component adsorption devices

39a and 39b are stored in the gas tank 66 as they are.

As described above, the LNG base 4 of the fourth embodiment includes two heavy

component adsorption devices

39a and 39b that adsorb and separate heavy components contained in the LNG, while alternately performing adsorption and desorption (regeneration). Since the power generation gas and the city gas are manufactured, the LNG received in the

LNG tanks

11a and 11b is not limited to a specific LNG, and various operations and operations can be performed as in the LNG base 1 of the first embodiment.

In the above embodiment, two heavy

component adsorption devices

39a and 39b are arranged in parallel and used while being switched alternately. However, the number of heavy

component adsorption devices

39a and 39b is limited to two. Is not to be done. When the methane concentration in LNG cannot be set to the predetermined methane concentration with the two heavy component adsorption devices, four heavy component adsorption devices are used, and the two heavy component adsorption devices are connected in series. It is possible to arrange two of them. In this case, the adsorbents used in the preceding and subsequent heavy adsorption devices may be different.

In addition, when there is a concern that the flow rate and pressure fluctuate when switching the heavy

component adsorption devices

39a and 39b, three heavy component adsorption devices may be installed in parallel. A buffer tank may be provided on the outlet side.

Moreover, in the said embodiment, although the heavy part isolate | separated by heavy part adsorption |

suction apparatus

39a, 39b was stored in the gas tank 66 as gas, the example which supplies the heavy part of a gas state to the calorie | heat amount adjustment apparatus 63 was shown, The heavy component may be stored in a liquid state, and the heavy component may be supplied to the calorific value adjustment device 63 in a liquid state. The number of LNG tanks is not limited to two.

FIG. 5 is a device configuration diagram of the LNG base 5 according to the fifth embodiment of the present invention. The same components as those of the

LNG bases

1, 2, 3, and 4 shown in FIGS. 1 to 4 are denoted by the same reference numerals and description thereof is omitted.

The LNG base 5 of the fifth embodiment is an LNG base constructed based on the same technical idea as the LNG base 1 of the first embodiment, and the

LNG bases

1, 2, 3, As in 4, the power generation gas supply system that supplies methane gas or vaporized gas mainly composed of methane gas as power generation gas, and the amount of heat that can be used as city gas without supplying a heat-increasing agent from the outside. And a fuel supply system for supplying the calorific value adjustment gas and / or the calorific value adjustment LNG.

The LNG base 5 has the same basic configuration as the LNG base 1, but the LNG base 5 uses the distillation device 23 as a means for separating and collecting heavy components contained in the LNG, whereas the LNG base 5 As a means for separating and recovering heavy components contained in LNG, a gas separation device 57 is used. In the present embodiment, a heavy component separation facility is configured with the gas separation device 57 and the gas tank 66 as main equipment.

The gas separation device 57 stores therein a gas separation membrane that separates methane and heavy components such as ethane, propane, and butane. The gas separation membrane only needs to be able to separate methane and heavy components such as ethane, propane, and butane, and the permeate may be methane or heavy components such as ethane, propane, and butane. . The gas separation membrane may be either an inorganic membrane or an organic membrane, but it must be capable of producing a gas having a methane concentration of 96 to 100 vol%. The gas separation membrane is not limited to one stage, and a plurality of stages may be installed in series. Further, those having a large permeation flow rate are preferable.

The gas separation device 57 is installed on the downstream side of the vaporizer 27, and the separated methane gas is stored in the gas turbine 101 as a power generation gas, and heavy components such as ethane, propane, and butane are stored in the gas tank 66.

As described above, the LNG base 5 of the fifth embodiment is connected to the

LNG tanks

11a and 11b, the

LNG discharge lines

15a and 15b, the mixing line 21, the vaporizer 27, the gas line 29, the gas separation device 57, and further to this. The

BOG lines

51a, 51b, and 55 constitute a power generation gas supply system. Further, a fuel production facility is constituted by a heat quantity adjusting device 63, a gas tank 66, a heat quantity agent supply line 71 and the like, and a calorimeter 73, and the fuel production equipment,

LNG tanks

11a, 11b, LNG The

delivery lines

15a and 15b, the mixing line 21, the branch line 61, and the city gas line 77 constitute a fuel supply system.

Next, a typical operation method of the LNG base 5 will be described. The operation methods shown below are representative examples, and the operation method of the LNG base 5 is not limited to the following operation methods and numerical values.

When LNG stored in the LNG tank 11a is used to produce power generation gas and city gas, the vaporized gas (NG) vaporized by the vaporizer 27 is supplied to the gas separation device 57, and the amount of heat is adjusted via the branch line 61. Send to device 63. The power generation gas is separated as a power generation gas by separating the heavy components contained in the vaporized gas by the gas separation device 57 to a methane concentration of 98% or more.

The LNG stored in the LNG tank 11a has a methane concentration of about 95%, and the calorific value is insufficient to make city gas. Therefore, the LNG stored in the LNG tank 11a is vaporized as it is and sent as city gas. Can not do it. Therefore, the heavy component is supplied to the calorific value adjusting device 63 through the heat increasing agent supply line 71 so that the calorific value becomes a predetermined calorific value, and this is sent out as city gas.

A procedure for producing power generation gas and city gas using LNG stored in the LNG tank 11b will be described. The vaporized gas (NG) vaporized by the vaporizer 27 is sent to the gas separation device 57 and further to the calorific value adjustment device 63 via the branch line 61. Since this vaporized gas does not contain heavy components, the vaporized gas sent to the gas separation device 57 is sent as it is as a power generation gas.

The LNG stored in the LNG tank 11b has a methane concentration of 100%, and the amount of heat generation is insufficient to make the city gas, so the vaporized gas cannot be sent out as the city gas as it is. In the case of vaporized gas having a methane concentration of 100%, heavy components cannot be recovered even if they are passed through the gas separation device 57, but the LNG base 5 is provided with a gas tank 66 for storing the heavy components. City gas is produced from the heavy components stored in 66 and LNG having a methane concentration of 100%.

The blended LNG produces power generation gas in the same manner as the LNG with 95% methane concentration shown in Case 1. City gas sends out gas which vaporized blended LNG. In this case, since it is not necessary to add heavy components to the production of city gas, the heavy components separated by the gas separation device 57 are stored in the gas tank 66 as they are.

As described above, the LNG base 5 of the fifth embodiment includes the gas separation device 57 that separates heavy components contained in the vaporized gas, and produces power generation gas and city gas. Therefore, the LNG base of the first embodiment. Similarly to 1, the LNG received in the

LNG tanks

11a and 11b is not limited to a specific LNG, and various operations and operations can be performed.

In the above embodiment, when a line bypassing the gas separation device 57 is provided and LNG having a predetermined methane concentration is received, the vaporized gas may be sent as it is as a power generation gas. Further, the branch line 61 may be connected to the mixing line 21 on the upstream side of the vaporizer 27, and LNG may be sent to the heat quantity adjusting device 63. In this case, a vaporizer is provided in the city gas line 77. The number of LNG tanks is not limited to two.

In the above embodiment, the vaporized gas is separated into heavy components such as methane and ethane, propane, and butane through the gas separation membrane, but instead of the gas separation membrane, a liquefier is used to use methane and ethane, propane, A heavy component such as butane may be separated. The vaporized gas vaporized by the vaporizer may be set to a predetermined temperature and pressure to liquefy heavy components such as ethane, propane, and butane, and these may be separated from methane gas.

Also, instead of the gas separation membrane, an adsorbent may be used to adsorb and separate heavy components such as ethane, propane and butane in the vaporized gas. The apparatus configuration is the same as that of the fourth embodiment, and the vaporized gas is sent to the heavy fraction separator containing the adsorbent, and heavy using pressure swing adsorption (PSA) method, PSA method + temperature swing adsorption (TSA) method. Minutes may be absorbed and desorbed. An example of the adsorbent is activated carbon.

As described above, as shown in the first to fifth embodiments, the LNG base of the present invention is basically the same as the existing LNG base, with heavy component separation equipment, and the separated heavy component is added to LNG or vaporized gas to increase the amount of heat. This can be realized by additionally installing a device to be adjusted, and even when the existing LNG base is remodeled, the influence on the operating facilities of the LNG base can be minimized.

Further, in the LNG bases of the first to fifth embodiments, an example of supplying power generation gas to the power plant has been shown, but the supply destination of power generation gas is not limited to the power plant, and even for private use Good. Furthermore, when the heavy component separated and recovered by the heavy component separator becomes surplus, it may be sold to a gas company or the like. Since the heavy portion is usually traded at a higher price than LNG, the commercial value is high.

The present invention is not limited to the above-described embodiment, and can be changed and used without changing the gist. For example, in the above-described embodiment, two types of LNG are mixed by line blending, but tank mixing in which two types of LNG are mixed in an LNG tank may be employed instead of line blending. Moreover, a heater and a flash drum can be used as the heavy fraction separator. As a modification of the fifth embodiment, a gas separation device using a gas separation membrane and a gas separation device using an adsorbent may be used in combination.

1, 2, 3, 4, 5

LNG base

11a,

11b LNG tank

15a, 15b

LNG discharge line

17a, 17b LNG pump 21

Mixing line

23, 23a,

23b Distillation device

25, 25a, 25b Upper line 27 Vaporizer 29 Gas line 33 Communication line 35

Mixing line

37a,

37b Mixing line

39a, 39b Heavy

component adsorption device

41, 41a,

41b Lower line

51a, 51b BOG line 55 BOG line 57

Gas separation device

61, 61a, 61b Branch line 63 Heat quantity adjusting device 65 Storage tank 66 Gas tank 67 Thermal agent supply pump 71 Thermal agent supply line 73 Calorimeter 75 Fuel line 77 City gas line 101 Gas turbine

Claims

An LNG base that receives and stores LNG in an LNG tank, adjusts the stored LNG to a predetermined property, and supplies it as vaporized gas, LNG,
A power generation gas supply system for supplying methane gas or a vaporized gas mainly composed of methane gas as a power generation gas;
A fuel supply system that supplies a calorific value adjustment gas and / or a calorific value adjustment LNG adjusted to a calorific value that can be used as city gas without supplying a heat-increasing agent from the outside;
An LNG base comprising:
The LNG base according to claim 1, wherein the power generation gas is a gas turbine fuel, and is a vaporized gas whose methane concentration is controlled to a constant value.
A heavy component separation apparatus for separating heavy components that are highly exothermic components contained in LNG or vaporized gas obtained by vaporizing LNG, and a heavy component separation facility having a heavy component storage tank for storing the separated heavy components; ,
A fuel production facility for producing a calorific value adjusting gas and / or a calorific value adjusting LNG by adding a heavy component separated by the heavy fraction separating device to a vaporized gas obtained by vaporizing LNG and / or LNG;
With
The heavy gas is separated from the vaporized gas obtained by vaporizing the LNG from which the heavy gas has been separated by the heavy fraction separator, and from the vaporized gas obtained by vaporizing the LNG by the heavy fraction separator. The LNG base according to claim 1 or 2, wherein the LNG base is a vaporized gas, a vaporized gas obtained by vaporizing the received LNG as it is, or a gas obtained by mixing these vaporized gases.
BOG generated in the LNG tank that receives and stores LNG is pressurized by a compressor, and vaporized gas obtained by vaporizing LNG from which heavy components have been separated by the heavy fraction separator, and vaporized gas obtained by vaporizing LNG. It is characterized in that it is mixed with a vaporized gas from which a heavy component has been separated by a heavy fraction separator, a vaporized gas obtained by vaporizing the received LNG as it is, or a gas obtained by mixing these vaporized gases and supplied as a power generation gas. The LNG base according to claim 3.
Two or more LNG tanks,
LNG mixing means for mixing two or more types of LNG stored in the LNG tank at a predetermined ratio,
The heavy fraction separation facility is a shared facility for each LNG tank system,
The heavy fraction separator is capable of separating heavy fraction from LNG mixed by the LNG mixing means or vaporized gas obtained by vaporizing LNG mixed by the LNG mixing means. LNG base of 4.
The LNG base according to claim 5, wherein the LNG is mixed by tank mixing for mixing LNG in an LNG tank, or by line blending for mixing LNG in an LNG discharge system.
With two or more LNG tanks,
The heavy fraction separator is provided in each LNG tank system,
The LNG base according to claim 3 or 4, wherein the heavy storage tank for storing heavy components is shared by each LNG tank system.
Two or more LNG tanks are provided, and the LNG tank is a power generation LNG tank system that accepts only power generation LNG that can supply vaporized gas obtained by vaporizing LNG as it is, and only LNG other than power generation LNG. Is distinguished from the non-power generation LNG tank system that accepts
The LNG base according to claim 3 or 4, wherein the heavy component separation facility is installed only in the non-power generation LNG tank system.
The heavy separation device used was a distillation device, a gas separation device equipped with a gas separation membrane, a liquefaction device for cooling and liquefying the vaporized gas, a heavy component attachment / detachment device for adsorbing and desorbing heavy components, or a pressure swing adsorption method. It is an adsorption | suction apparatus, The LNG base of any one of Claim 3 to 8 characterized by the above-mentioned.
An LNG base vaporized gas and / or LNG supply method for receiving and storing LNG in an LNG tank, adjusting the stored LNG to a predetermined property and supplying the LNG as vaporized gas, LNG,
Methane gas or vaporized gas containing methane gas as a main component is produced by separating LNG or heavy components that are highly exothermic components contained in the vaporized gas obtained by vaporizing LNG, or by vaporizing received LNG as it is, or Vaporized gas produced by the two or more methods is mixed and manufactured, or BOG generated in the LNG tank is mixed with the gas, and the gas is supplied to a customer as a power generation gas.
Vaporized gas and / or LNG adjusted to a calorific value that can be used as city gas is manufactured using the above-mentioned heavy component separated without supplying a heat increasing agent from the outside, or a heat increasing agent is supplied from the outside A gas and / or LNG supply method for an LNG base, characterized in that two or more kinds of LNG are vaporized and / or LNG is mixed and manufactured, and supplied to a customer.