JP2002039498A - Energy supplying method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To offer an energy supplying method for power generation to be made by supplying a fuel of a heat-electricity combination supply system using an LNG storage chamber for power generation applied to ordinary power generating works, whereby energy supplying with a high general energy efficiency can be established through effective utilization of the LNG storage chamber as it is. SOLUTION: The energy supplying method is constituted so that LNG stored in an LNG storage chamber for power generation is gasified in a carburettor, and the gasified fuel gas is used as crude material for power generation to generate the power by a facility in a power plant, and the generated power is supplied, wherein power generation is conducted with the gasified fuel gas to be supplied to the heat-electricity combination supply system via an urban gas conduit network. The LNG stored in the LNG storage chamber for ordinary power generation is gasified by carburettor, and power generation is made using the gasified fuel gas as the crude material for power generation, and the generated power is supplied as commercial electric power. According to this constitution, energy supplying can be made with a high general energy efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Industrial application] L stored in LNG storage tank for power generation
The present invention relates to an energy supply method in which NG is vaporized by a vaporizer, and part or all of the vaporized fuel gas is supplied to a cogeneration system through a city gas pipeline network to generate power.

[0002]

2. Description of the Related Art General electric utilities (so-called electric power companies)
As shown in FIG. 2, LNG1 is transported from overseas using an LNG ship, LNG1 is stored in LNG storage tank 3 for power generation, and then LNG1 stored in LNG storage tank 3 for power generation is vaporized to evaporate fuel gas. Conventionally, a method has been employed in which power is generated by a power generation facility 30 in a power plant using the power as a raw material for power generation, and the generated power is supplied to a power load 22 as commercial power 2. It is well known that such a natural gas power generation system occupies a position as a power generation method for peak saving among power generation systems. However, in the natural gas power generation system, the power generation efficiency is at most about 40% in the current steam power generation system, and even if the combined power generation system is adopted, the power generation efficiency is considered to be only 45 to 50%. Total energy efficiency of cogeneration system is 70
It has been pointed out that the total energy efficiency of the natural gas power generation system at the power plant is too low compared to reaching ~ 85%. On the other hand, in order to cope with the power demand increasing year by year (particularly, the power demand at the peak time in the summer), general electric power companies are being burdened with heavy capital investment in power supply development. Furthermore, at present, the construction of nuclear power plants does not proceed slowly due to the opposition of the residents. As a countermeasure against the increasing power demand, the issue of how to suppress the load at the peak time (particularly, the load at the peak time in summer) has been greatly highlighted. Further, there has been a problem that electric power is effectively used at a peak off time when power demand is small.

[0003]

SUMMARY OF THE INVENTION Power generation L for general power generation
The conventional technology in which LNG stored in an NG storage tank is vaporized by a vaporizer to generate power by using a vaporized fuel gas as a power generation material and the generated power is supplied has a problem that the overall energy efficiency is low. Was. Accordingly, an object of the present invention is to provide an energy supply method for supplying fuel for a combined heat and power supply system to generate power using a power generation LNG storage tank for a general power generation business, by effectively utilizing the power generation LNG storage tank as it is, Another object of the present invention is to propose an energy supply method with high total energy efficiency. In particular, it is an object of the present invention to provide an energy supply method for supplying fuel of a cogeneration system using a power generation LNG storage tank to generate power, thereby effectively utilizing the power generation LNG storage tank as it is to further improve overall energy efficiency. It consists in proposing a high energy supply method. Still another object of the present invention is to propose an energy supply method that can effectively use power in a time zone when power demand falls, thereby smoothing power demand.

[0004]

Means for Solving the Problems With regard to the inventive step of the present invention, the electric power company is required to store the L stored in the LNG storage tank for power generation.
Although NG is generated by the power generation equipment in the power plant and the generated power is supplied as commercial power, the idea of using the LNG stored in the LNG storage tank for power generation for other energy supply methods is now being considered. By that time, it would lead to the denial of what we had done as an electric utility,
It was very difficult. However, the present inventor has no necessity that the LNG stored in the LNG storage tank for power generation must be generated by the power generation equipment in the power plant, and from a national point of view, if there is a more energy-efficient energy supply method, For example, the L stored in the LNG storage tank for power generation
The idea that NG should be supplied to the cogeneration system via the city gas pipeline network to generate power led to the present invention. Means for solving the problem is the invention described in the following claims.

Claims 1. An LNG stored in a power generation LNG storage tank is vaporized by a vaporizer, and the vaporized fuel gas is used as a power generation material to generate power in a power generation facility in a power plant, and energy for supplying the generated power is provided. In the supply method, LNG for power generation
After the LNG stored in the storage tank is vaporized by the vaporizer, a part or all of the vaporized fuel gas is supplied to the city gas pipeline network to be supplied to the cogeneration system through the city gas pipeline network to generate power. An energy supply method comprising:

2. LNG stored in a power generation LNG storage tank is vaporized by a vaporizer, and then the generated fuel gas is used as a power generation raw material to generate power in a power generation facility in a power plant, and energy for supplying the generated power is provided. In the supply method, LNG for power generation
An energy supply method comprising vaporizing LNG stored in a storage tank with a vaporizer, and then supplying a part or all of the vaporized fuel gas to a cogeneration system through a city gas pipe network.

3. The energy supply method according to claim 1, wherein the cogeneration system is a cogeneration system including a power storage device.

4. The energy supply method according to claim 1, wherein the combined heat and power supply system is a combined heat and power supply system including a power storage device for storing commercial power during a time when power demand falls.

5. The combined heat and power system according to claim 1, wherein the combined heat and power system is a combined heat and power system that supplies the stored electric power to a power load during a peak time of the power demand.
5. The energy supply method according to 4.

6. The combined heat and power system according to claim 1, wherein the combined power and heat system supplies the electric power stored in the power storage device and the commercial electric power to the electric power load at a time when the electric power demand is at a peak. 6. The energy supply method according to 5.

7. An LNG stored in a power generation LNG storage tank is vaporized by a vaporizer, and the vaporized fuel gas is used as a power generation raw material to generate power in a power generation facility in a power plant, and energy for supplying the generated power is provided. In the supply method, LNG for power generation
After the LNG stored in the storage tank is vaporized by the vaporizer, a part or all of the vaporized fuel gas is supplied to the city gas pipeline network to be supplied to the absorption cooling and heating system through the city gas pipeline network. Characteristic energy supply method.

8. An LNG stored in a power generation LNG storage tank is vaporized by a vaporizer, and the vaporized fuel gas is used as a raw material for power generation to generate power in a power generation facility in a power plant, and energy for supplying generated power is provided. In the supply method, LNG for power generation
An energy supply method comprising: evaporating LNG stored in a storage tank with a vaporizer; and supplying a part or all of the vaporized fuel gas to an absorption-type air-conditioning system through a city gas pipe network. (Explanation of terms) The fuel gas is a power generation facility mainly composed of natural gas obtained by evaporating LNG in an LNG storage tank for power generation or natural gas obtained by evaporating LNG in an LNG storage tank for power generation, a cogeneration system, and an absorption type air conditioner. Refers to gas for fuel in systems and the like. In the present invention, not only all of the fuel gas obtained by vaporizing LNG stored in the LNG storage tank for power generation is supplied to the cogeneration system through the city gas pipeline network, but also a part of the vaporized fuel gas is passed through the city gas pipeline network. The remaining fuel gas supplied to the cogeneration system may be used for other purposes such as power generation in a power plant.・ Natural gas refers to natural gas obtained by vaporizing LNG and LN
It also refers to fuel gas containing natural gas obtained by vaporizing G as a main component. -The LNG storage tank for power generation refers to a storage tank constructed to store LNG for power generation by a power generation facility in a power plant using natural gas as fuel. What is LNG storage tank for power generation?
Not only all stored LNG but also some stored LNG
It also includes cases where it is used for power generation in power plants. Primarily refers to those already constructed, including those under construction and those planned to be constructed. -LNG refers to liquefied natural gas. A vaporizer is a device that vaporizes LNG into heat gas (natural gas) by heat of seawater or the like. -The city pipeline network consists of pipes for supplying city gas to city gas consumers, or city gas pipelines. Fuel gas can be supplied to a cogeneration system, an absorption cooling and heating system, and the like through a city gas pipeline network. Here, the city gas pipe refers to a pipeline inside the factory for supplying city gas, and the city gas pipe refers to a pipeline outside the factory for supplying city gas. -The combined heat and power system is a system that supplies electric power by a power generator and recovers waste heat generated by operation of the power generator to supply heat. The cogeneration system is
It is a decentralized system that needs to be installed in a power consuming area. The power storage device includes at least one or more selected from a lithium secondary battery, a nickel hydride battery, and a capacitor, in addition to a device that electrolyzes water to produce and store hydrogen and oxygen. Including equipment. Capacitors are useful for responding to sudden increases in electrical loads. It is desirable to use it together with a lithium secondary battery or the like. As the capacity of the power storage device, for example, 20 kWh or less, 15 kWh or less, 1
It is 0 kWh or less, 5 kWh or less, or 2 kWh or less. Note that a power storage device generally requires a converter for converting commercial power (AC power) to DC power, and an inverter for converting DC power stored in a power storage area to AC. When the AC power generated by the AC power generation device is stored, the DC power is converted into DC by the converter and then stored in the power storage device. When the stored power is DC power (DC power generated by a DC power generator), a converter is not required. Further, in the case of a power load of the DC cogeneration system, an inverter is not required downstream of the power storage device, and the system is simplified.・ Converters and inverters Converters convert AC power into DC power. The inverter converts DC power into AC power.・ Total energy efficiency includes power transmission loss when power is generated by power generation facilities in a power plant and power is supplied through a power line as in the past. Therefore, it can be calculated by total energy efficiency = (power energy−transmission loss) / LNG primary energy. On the other hand, in the case of the combined heat and power system of the present invention, the total energy efficiency can be calculated as follows: total energy efficiency = (power energy + heat energy) / LNG primary energy. Generally, the former is 35 to 40%, whereas the latter is very high, 70 to 85%. The peak time period generally refers to a time period during which the power consumption of the combined heat and power system is peak, and refers to a time period t1 to t2 in which the power consumption is equal to or higher than the specific output C1. In addition to a system in which power consumption is strictly determined at a specific output C1 or more at each instant t, a time period in which the power load of the power load of the combined heat and power supply system is equal to or higher than the specific output C1 is determined in advance by t1 based on data of a certain period. To t2 in some cases. The specific outputs C1 and C2 used here are times (including months, days, seasons, etc.) even when they are constant values that do not change with time and do not change.
(Ie C1 and C1)
2 is a function of time t). The time zone in which the power consumption is equal to or higher than the specific output C1 includes a peak time zone (for example, a peak time zone of the morning and evening power consumption). For example, power consumption fluctuates (seasonal fluctuation) depending on the seasons of spring, summer, autumn and winter,
In addition, it fluctuates between day and night (day / night fluctuation) in a day, but in the present invention, it refers to a peak time zone of daily fluctuation. The time period refers to a certain time range. When the time range is very short, the time period indicates an instant, and the peak time period is synonymous with the peak time. In addition, the peak time zone of the power consumption of the combined heat and power system and the peak time zone of the commercial power generally tend to coincide with each other. The time period during which the power load (power consumption) is low and the time period during which the power load (power consumption) falls are defined as time periods t3 to t in which the power consumption of the power load of the combined heat and power system is equal to or less than the specific output C2.
4 (e.g., nightly charge time zone). In addition to the case where the system is strictly determined at each instant t, the time period during which the power load of the power load of the combined heat and power supply system is equal to or higher than the specific output C2 is set in advance to t3 to t4, During the time period t3 to t4, the commercial power can be always stored in the power storage device using the commercial power. The time zone in which the power consumption of the power load of the combined heat and power supply system is equal to or less than the specific output C2 includes a time zone in which the power consumption falls (for example, a nighttime charge time zone). In general, the time period during which the power consumption of the power load of the combined heat and power supply system falls and the time period during which the power consumption of the commercial power falls are generally the same. Note that the expressions “nightly charge time zone” and “nighttime time zone” include the meaning of “time zone where the power load is small (falls)”. -The absorption type cooling / heating system refers to a heat pump type cooling / heating system operated by using a refrigerant as a working medium and an absorbent for absorbing the refrigerant. The absorption cooling and heating system is a system that is expected to have an effect of summer peak saving of commercial power demand similarly to the combined heat and power system.

[0005]

FIG. 1 is a block diagram of an energy supply method. FIG. 1 shows an embodiment of the present invention (especially, claims 1 and 2), which will be described with reference to FIG. The energy supply system 100 includes the LNG 2, the LNG storage tank 3 for power generation, the vaporizer 4, the city gas pipe network 12, the commercial power 2, the cogeneration system 20, the heat load 21, and the power load 22 as constituent elements. The LNG 2 is transported from the LNG ship to the power generation LNG storage tank 3 by a loading arm, an LNG pipe, or the like, and stored. Conventionally, the LNG 2 stored in the LNG storage tank 3 for power generation is vaporized by the vaporizer 4 and then generated by the power generation equipment 30 installed in the power plant using the vaporized fuel gas as a raw material for power generation to generate power. Electric power was supplied as commercial power 2. However, after the LNG 1 stored in the LNG storage tank 3 for power generation is vaporized by the vaporizer 4, the LNG 1 is generated by the power generation equipment 30 in the power plant using the vaporized fuel gas as a raw material for power generation, and supplies the generated power. In the energy supply method, after the LNG 1 stored in the LNG storage tank 3 for power generation is vaporized by the vaporizer 4, part or all of the vaporized fuel gas is supplied to the cogeneration system 20 through the city gas pipe network 12. The present invention provides an energy supply method for supplying electricity to a city gas pipeline network 12 for generating power.
In the present invention (the present invention of all claims), the power generation LN
All of the fuel gas obtained by vaporizing LNG stored in the G storage tank 3 is supplied to the cogeneration system 20 through the city gas pipe network 12.
In some cases, some fuel gas is supplied to the cogeneration system 20 through the city gas pipe network 12, and the remaining fuel gas is used for other purposes such as power generation in a power plant. It is possible. Not only all stored LNG but also some stored LNG stored in the LNG storage tank 3 for power generation described above (including the present invention of all claims) are transferred to the cogeneration system 20 through the city gas pipe network 12. The supplied and remaining storage LNG may be used for other applications, such as power generation applications. -The invention described in claim 1 is mainly based on the fact that the electric utility wholesales and sells fuel gas to a city gas company having a customer of the cogeneration system, or the electric company sells the city gas to the city gas company. The present invention was invented on the assumption that fuel gas would be supplied to a city gas company as a compensation for use in supplying the combined heat and power system. Electricity utilities
A part or all of the fuel gas obtained by vaporizing LNG stored in the LNG storage tank for power generation by a vaporizer is supplied to a city gas company (it is desirable to have a large number of users of the cogeneration system).
It is supplied to. Advantageous Effects of Invention According to the present invention, LNG stored in a power generation LNG storage tank can be generated by a combined heat and power supply system with high overall energy efficiency. As a result, in particular, the cogeneration system has become widespread, and a large number of cogeneration systems have been connected to the city gas pipeline network.
In the case where there is already a demand for power and heat as a whole, by supplying a part or all of the fuel gas obtained by vaporizing LNG stored in the LNG storage tank for power generation by a vaporizer to a city gas pipeline network. Thus, an energy supply method with higher overall energy efficiency can be achieved. The invention described in claim 2 is mainly based on the assumption that the electric utility supplies a part or all of the vaporized fuel gas to the cogeneration system using the city gas pipeline network of the city gas company. It was invented. According to the present invention, the electric power company supplies a part or all of the vaporized fuel gas to the cogeneration system using the city gas pipeline network of the city gas company to store the fuel gas in the LNG storage tank for power generation. The obtained LNG can be generated by an energy efficient cogeneration system. As a result, electric utilities themselves develop the heat and power demands of cogeneration systems,
By connecting multiple cogeneration systems to the city gas pipeline through the city gas utility's city gas pipeline,
An energy supply method with high energy efficiency can be achieved. If there is a potential demand for electricity and heat, and the cogeneration system is not yet connected to the city gas pipeline or is not so connected, the LNG stored in the LNG storage tank for power generation is This is an energy supply method that is used effectively from the viewpoint of energy efficiency. The improvement of the invention according to claim 2 is that the gaseous fuel gas is partially or entirely vaporized within a predetermined period / the city gas amount supplied to the cogeneration system for a predetermined period of time (the fuel supplied to the city gas pipe network). The ratio between the gas amount and the gas usage amount of the cogeneration system (給, simply referred to as ratioζ) is 0.5 to 1.5 (preferably 0.75 to 1.25, more preferably 0.9 to 1.5).
1.1, more preferably 0.95 to 1.05, even more preferably 0.98 to 1.02, and still more preferably 0.1 to 1.05.
3. The invention according to claim 2, wherein the remote control is performed so as to be 99 to 1.01). Here, the predetermined period refers to, for example, a weighing sampling period, for example, 3
0 minutes, 1 hour, etc. Sampling period (t, t + Δ
The ratio ζ (t, t + Δt) during t) is calculated. Basically, the fact that the amount of the city gas supplied to the cogeneration system 20 matches the amount of the city gas supplied to the city gas conduit network with the vaporized fuel gas (that is, ζ (t, t + Δt) = 1) means that the city gas business Is desirable because it does not affect the elderly.
Further, the present invention provides a fuel gas amount measuring device M1 for measuring the amount of vaporized fuel gas and a cogeneration system 20 (one or two).
One or more cogeneration systems 20. ) Is installed, a city gas amount measuring device M2 for measuring the amount of city gas supplied (hereinafter also simply referred to as city gas amount) is installed, the fuel gas amount and the city gas amount are measured, and these are communicated by a communication device (not shown). ) Is transmitted to an external communication device (not shown) in the external control system 100. In the external control system 100,
The ratio ζ (t, t + Δt) is calculated, and the fuel gas amount control device C1 and / or the city gas amount control device C2 are remotely controlled by a command signal of the external control system 100 so that the numerical value falls within the above numerical range. I do. Specifically, the fuel gas amount control device C1 and / or the city gas amount control device C
Reference numeral 2 denotes a device for controlling a gas amount by opening and closing a valve by remote control. The communication device (not shown) is installed at each location where the fuel gas amount measuring device M1 is installed and where the cogeneration system is installed (where the city gas amount measuring device M2 is installed). The external communication device (not shown) is means for communicating with the communication device (not shown), and is installed in the external control system 100. The invention described in claim 3 is the energy supply method according to claims 1 or 2, wherein the cogeneration system is a cogeneration system including a power storage device. Since the cogeneration system was provided with the power storage device, for example, during the late night time when power consumption of the power load of the cogeneration system was small, commercial power was stored in the power storage device, and stored in the power storage device during daytime power peaks. Since the commercial power can be supplied, the commercial power load is more leveled. On the other hand, the nation as a whole can store electricity in the power storage devices of each cogeneration system that spreads commercial power during the nighttime toll hours, so the power storage devices perform the same function as the pumped storage reservoirs. The use of the commercial power stored in the system during the peak hours can be expected to lead to the cut of the peak hours of the entire commercial power. At present, the power storage system actually implemented includes a pumped storage power generation system, but the energy efficiency of the pumped storage power generation system is about 70% due to mechanical loss. The power storage device installed in the cogeneration system corresponds to a reservoir in the case of pumped storage power generation. However, since the power storage device uses an electrochemical reaction and there is almost no mechanical loss in the pumping method, the energy efficiency of the power storage is 80 to 90%, and the present invention relates to the power storage device installed in the cogeneration system. Is also superior to pumped storage in terms of energy efficiency of storage. The invention according to claim 4 is the energy supply method according to any one of claims 1 to 3, wherein the combined heat and power system is a combined heat and power system including a power storage device that stores commercial power during a time when power demand falls. It is. By storing commercial power in the power storage device during a time period when power demand falls, an effect equivalent to constructing a reservoir for pumped storage power generation can be achieved. For example, commercial power can be stored in the power storage device at midnight when power consumption of the power load of the combined heat and power system is low, and the commercial power stored in the power storage device can be supplied at the peak of daytime power. Therefore, the commercial power load will be more leveled, and will have the same effect as constructing a reservoir for pumped storage power generation. -The invention according to claim 5 is characterized in that the combined heat and power system is a combined heat and power system that supplies the stored electric power to the electric power load during a time period when the power demand is at a peak. Energy supply method. The combined heat and power system can reduce the size by supplying the power stored in the power storage device to the power load during the peak time of the power demand, leading to cost reduction, and the widespread use of the combined heat and power system. This has the effect of achieving widespread use. The invention according to claim 6 is the energy supply method according to any one of claims 1 to 5, wherein the electric power stored in the power storage device and the commercial electric power are supplied to the electric power load during a time period when the electric power demand is at a peak. is there. The cogeneration system can be downsized by supplying the electric power stored in the power storage device to the power load during the peak time of the power demand, leading to cost reduction and widespread use of the cogeneration system. It has become possible to achieve widespread use. The invention described in claim 7 is mainly based on the fact that the electric utility company wholesales and sells to a city gas company having a customer of the absorption type cooling / heating system, or the electric utility company uses the city gas company to absorb the city gas. The present invention was invented on the assumption that fuel gas would be supplied to a city gas company as a compensation for use in supplying to a cooling and heating system. Electricity utilities sell to city gas utilities (which have users of absorption-type air-conditioning systems) the fuel gas obtained by vaporizing LNG stored in the LNG storage tank for power generation with a vaporizer. is there. According to the present invention, for example, at the peak of power demand in summer, LNG stored in the LNG storage tank for power generation is vaporized into LNG by a vaporizer, and a part or all of the vaporized fuel gas is supplied to an absorption cooling and heating system. Since the power can be supplied, peak saving of commercial power in summer can be performed, and investment in power equipment can be suppressed low. The invention described in claim 8 is mainly based on the assumption that the electric power company supplies a part or all of the fuel gas to the absorption-type cooling and heating system using the city gas network of the city gas company. It was done. According to the present invention, the utility can use the city gas pipeline network of the city gas utility to supply some or all of the fuel gas to the absorption cooling and heating system, thereby saving the peak of commercial power in summer. And investment in power equipment can be suppressed. As a result, the electric utilities themselves develop the heat and power demands of the combined heat and power system, and connect a large number of absorption cooling and heating systems to the city gas pipeline network through the city gas pipeline network of the city gas company. Summer peak savings of commercial power can be achieved.

[0006]

According to the present invention, all the objects of the present invention have been achieved. In the conventional technology, LNG stored in a power generation LNG storage tank for general power generation is vaporized by a vaporizer, power is generated using a vaporized fuel gas as a power generation material, and the generated power is supplied as commercial power. We were able to solve some issues such as low overall energy efficiency. That is, the present invention relates to an energy supply method for supplying fuel of a combined heat and power supply system to generate power using an existing power generation LNG storage tank for a general power generation business, wherein the LNG stored in the existing power generation LNG storage tank is provided. Is vaporized by a vaporizer, and a part or all of the vaporized fuel gas is supplied to a cogeneration system using a city gas pipeline network of a city gas company, thereby providing an energy-efficient energy supply method. Could be provided. Further, the problem of the present invention in which the power demand is smoothed by effectively utilizing the power in the time zone when the power demand falls is also solved.
All of the objects of the present invention have been achieved.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional technique.

FIG. 3 is a block diagram of an improved invention according to claim 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... LNG 2 ... Commercial power 3 ... LNG storage tank for power generation 4 ... Vaporizer 11 ... City gas 12 ... City gas pipeline network 20 ... Cogeneration system 21 ... Heat load 22 ... Power load 30 ... power generation equipment M1 ... fuel gas amount measuring device M2 ... city gas amount measuring device C1 ... fuel gas amount controlling device C2 ... city gas amount controlling device 100 ... external control system

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[Procedure amendment]

[Submission date] June 26, 2001 (2001.6.2
6)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

[0006]

According to the present invention, all the objects of the present invention have been achieved. LNG stored in power generation LNG storage tank for general power generation
Is vaporized in a vaporizer, and the vaporized fuel gas is used as a power generation material to generate power, and the generated power is supplied as commercial power. I was able to. In other words, the present invention relates to an energy supply method for supplying fuel of a cogeneration system and generating power using an existing power generation LNG storage tank for a general power generation business.
LNG stored in the NG storage tank is vaporized by a vaporizer,
By supplying a part or all of the vaporized fuel gas to the cogeneration system using the city gas pipeline network of the city gas company, it was possible to provide an energy-efficient energy supply method. Further, the problem of the present invention in which the power demand is smoothed by effectively utilizing the power in the time zone when the power demand falls is also solved. All of the objects of the present invention have been achieved.

Claims (8)

[Claims] Claims 1. An LNG stored in a power generation LNG storage tank is vaporized by a vaporizer, and the vaporized fuel gas is used as a power generation material to generate power in a power generation facility in a power plant, and energy for supplying the generated power is provided. In the supply method, LNG for power generation
After the LNG stored in the storage tank is vaporized by the vaporizer, a part or all of the vaporized fuel gas is supplied to the city gas pipeline network to be supplied to the cogeneration system through the city gas pipeline network to generate power. An energy supply method comprising: 2. LNG stored in a power generation LNG storage tank is vaporized by a vaporizer, and then the generated fuel gas is used as a power generation raw material to generate power in a power generation facility in a power plant, and energy for supplying the generated power is provided. In the supply method, LNG for power generation
An energy supply method comprising vaporizing LNG stored in a storage tank with a vaporizer, and then supplying a part or all of the vaporized fuel gas to a cogeneration system through a city gas pipe network. 3. The energy supply method according to claim 1, wherein the cogeneration system is a cogeneration system including a power storage device. 4. The energy supply method according to claim 1, wherein the combined heat and power supply system is a combined heat and power supply system including a power storage device for storing commercial power during a time when power demand falls. 5. The combined heat and power system according to claim 1, wherein the combined heat and power system is a combined heat and power system that supplies the stored electric power to a power load during a peak time of the power demand.
5. The energy supply method according to 4. 6. The combined heat and power system according to claim 1, wherein the combined power and heat system supplies the electric power stored in the power storage device and the commercial electric power to the electric power load at a time when the electric power demand is at a peak. 6. The energy supply method according to 5. 7. An LNG stored in a power generation LNG storage tank is vaporized by a vaporizer, and the vaporized fuel gas is used as a power generation raw material to generate power in a power generation facility in a power plant, and energy for supplying the generated power is provided. In the supply method, LNG for power generation
After vaporizing the LNG stored in the storage tank with a vaporizer, a part or all of the vaporized fuel gas is supplied to the absorption-type heating and cooling system through a city gas pipeline network.
An energy supply method for supplying to a city gas pipeline network. 8. An LNG stored in a power generation LNG storage tank is vaporized by a vaporizer, and the vaporized fuel gas is used as a raw material for power generation to generate power in a power generation facility in a power plant, and energy for supplying generated power is provided. In the supply method, LNG for power generation
An energy supply method comprising: evaporating LNG stored in a storage tank with a vaporizer; and supplying a part or all of the vaporized fuel gas to an absorption-type air-conditioning system through a city gas pipe network.