JP2003254084A - Distributed cogeneration facility using gas hydrate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a distributed cogeneration facility increasing the supply of thermal energy by safely and efficiently transporting natural gas to remote areas. <P>SOLUTION: A natural gas hydrate c generated in a natural gas hydrate generation facility 21 provided in a liquefied natural gas receiving station or the like is transported using a transporting container 15 to the distributed cogeneration facility 21. At the distributed cogeneration facility 21, the natural gas hydrate c is intermittently fed from the container 15 into a high pressure container 22. The natural gas hydrate c in the high pressure container 22 is decomposed into fuel gas a' and water by use of reducing water heated by the air-conditioning load of an air-conditioning facility 23, and the high pressure fuel gas a' generated is fed to gas-consuming equipment 25 such as a gas turbine. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a distributed cogeneration facility using natural gas hydrate.

[0002]

2. Description of the Related Art Generally, large shopping centers, supermarkets, and hospitals scattered in the suburbs purchase electricity from electric power companies and fuel such as heavy oil from fuel companies to supply electricity and heat energy. However,
In recent years, it has been considered to use a micro gas turbine using natural gas, a fuel cell or the like as a means for supplying electricity and heat energy together.

However, in areas where there is no natural gas conduit, there is some need to transport natural gas or produce cold heat. Therefore, LNG (liquefied natural gas) and C
The use of NG (compressed natural gas) is conceivable, but in the case of LNG, a special tank with a double shell structure is required to maintain the state of -162 ° C. Further, in the case of CNG (compressed natural gas), since it is transported and stored in the form of high-pressure gas of about 25 to 30 MPa, it is transported and stored using a small-capacity cylinder tank, and the net transport amount and storage The quantity is reduced.

[0004]

The present invention has been made in order to solve the above-mentioned problems, and it is possible to safely and efficiently transport natural gas to a remote place and to reduce the amount of heat energy supplied. The main object of the present invention is to provide a distributed cogeneration facility using natural gas hydrate that can be improved.

[0005]

In order to solve the above-mentioned problems, a distributed cogeneration facility using a gas hydrate according to the invention as defined in claim 1 is a gas turbine power generation facility, a high pressure vessel, and a hot water boiler. And a decentralized cogeneration facility equipped with air-conditioning equipment, which uses a transportation container to disperse the natural gas hydrate produced by the natural gas hydrate production facility installed in the liquefied natural gas receiving terminal or natural gas field. It is transported to a cogeneration facility, where natural gas hydrate is intermittently sent from the transportation container to the high-pressure container by the distributed cogeneration facility, and the natural gas hydrate in the high-pressure container is heated by the air conditioning load of the air conditioning facility. The returned return water decomposes it into fuel gas and water, and the high-pressure fuel gas generated by the decomposition is consumed by gas turbines and other equipment. It is a distributed cogeneration equipment using a gas hydrate, which comprises delivering to the vessel.

[0006] A distributed cogeneration facility using a gas hydrate according to a second aspect of the present invention comprises a gas turbine power generator, a pressure vessel, a hot water boiler and an air conditioning facility, and the gas turbine power generator is It is composed of an air compressor, a combustor, a gas turbine and a generator, the pressure vessel and the air conditioning equipment are connected by a circulation pipe equipped with a circulation pump, and the pressure vessel and the combustor are provided with a control valve. The distributed cogeneration facility using a gas hydrate according to claim 1, wherein the pressure vessel is connected by a high pressure pipe, and the pressure vessel is provided with a connection pipe having an on-off valve.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, in a natural gas hydrate production facility 11 installed in a liquefied natural gas receiving terminal or a terminal 10 such as a natural gas field, the natural gas hydrate can be collected in a boil-off gas or natural gas field vaporized in an LNG tank (not shown). The natural gas a and the water b are introduced into the natural gas hydrate production tank 12 to produce the natural gas hydrate c (see symbol A in FIG. 3). The natural gas hydrate production tank 12 is provided with a known stirring means 13 to stir the inside of the tank.

The natural gas hydrate c produced in the natural gas hydrate production tank 12 is dehydrated and supercooled by a dehydrator and a supercooler 17 (see symbol B in FIG. 3) to be in the form of dry powder or pellets. After being processed
It is depressurized to atmospheric pressure and loaded in a transport container 15 mounted on the transportable skid 14 (see symbol C in FIG. 3). To supercool the natural gas hydrate c, for example,
LNG (liquefied natural gas) or the like is preferably used.

Thereafter, the transport container 15 loaded with the natural gas hydrate is transported by the trailer 16 to the distributed cogeneration facility 20. This distributed cogeneration facility 20, as shown in FIG.
Small and medium-sized gas turbine power generator 21 and pressure vessel 22
And an air conditioner 23 and a hot water boiler 28.

The gas turbine power generator 21 comprises an air compressor 24, a combustor 25, a gas turbine 26 and a generator 27. The air compressor 24 and the generator 27 are
It is adapted to be operated by the gas turbine 26.

On the other hand, the pressure vessel 22 and the air conditioning equipment 23 are
Water b shared by the heat exchanger 35 and heated by the heat exchanger 35
While injecting from the injection nozzle 36 into the pressure vessel 22,
The cold water b ″ cooled by the heat exchanger 35 is returned to the air conditioning equipment 23. Reference numerals 29 and 37 denote circulation pumps. Further, the pressure vessel 22 and the combustor 25.
Are connected by a high pressure pipe 32 with a control valve 31. Further, the pressure vessel 22 is provided with a connection pipe 34 having an opening / closing valve 33, and the transportation container 15 is connected to the connection pipe 34.

The transport container 15 that has arrived at the installation location of the distributed cogeneration facility 20 is separated from the trailer 16, placed on a predetermined place together with the portable skid 14, and then connected to the connection pipe 34 of the pressure container 22. (See FIG. 1). The inside of the transport container 15 is maintained at, for example, atmospheric pressure and at about −15 ° C.

However, after operating the on-off valve 33 to take in a predetermined amount of the natural gas hydrate c in the transportation container 15 into the pressure container 22, the circulation pumps 29 and 37 are operated to operate the inside of the pressure container 22. When the water b and the water b ′ in the air conditioning equipment 23 are circulated, the natural gas hydrate c in the pressure vessel 22 is decomposed into high-pressure fuel gas a ′ and water b (see symbols C → D in FIG. 3). .

High-pressure fuel gas a'obtained by decomposition
Is controlled by the control valve 31 to a predetermined pressure, for example, 1 to 2M.
The pressure is adjusted to Pa and the combustor 25 is supplied (see reference numeral D → E in FIG. 3). Then, it is mixed with the combustion air d supplied from the compressor 24 and burned to form combustion gas, which is supplied to the gas turbine 26 and serves as a driving force for rotationally driving the generator 27.

The cold water b ″ cooled (for example, about 7 ° C.) with the produced water b generated by the decomposition of the natural gas hydrate c is supplied to the air conditioning equipment 23. Warm water (for example, about 12 ° C) b '
Are returned to the heat exchanger 35 again. The extra generated water b is transferred to a water tank (not shown).

On the other hand, the exhaust gas e discharged from the gas turbine 26 is introduced into the hot water boiler 28 and is used for generating hot water. When the natural gas hydrate c in the pressure vessel 22 is consumed, the transportation vessel 15 changes the pressure vessel 22.
Then, the natural gas hydrate c is supplied again, and the same work as above is performed.

FIG. 3 is a diagram showing a dissociation curve of natural gas. The boil-off gas vaporized in the LNG tank at the LNG receiving terminal and the natural gas collected in the natural gas field are converted into natural gas hydrate in the natural gas hydrate production tank. A rate is produced (A) which is dehydrated and subcooled (B) and loaded onto a trailer (C). At this time, the natural gas hydrate is in a self-preserving state.

On the distributed cogeneration side, a natural gas hydrate is decomposed by a load such as an air conditioner to separate fuel gas and water (C → D → E). The generated fuel gas is supplied to a gas consuming device such as a gas holder or a gas turbine, and the generated water is transferred to a water tank.

In the above description, the case where the fuel gas produced by decomposing the natural gas hydrate is supplied to the gas turbine has been described. However, it may be supplied to a gas consuming device such as a gas engine or a fuel cell. Conceivable.

[0021]

As described above, the present invention is a distributed cogeneration facility equipped with a gas turbine power generation facility, a high pressure vessel, a hot water boiler, an air conditioning facility and the like, which is a liquefied natural gas receiving base or natural gas. The natural gas hydrate produced in the natural gas hydrate production facility installed in the rice field is transported to the distributed cogeneration facility using a transportation container, and the natural gas hydrate is pressurized from the transportation container in the distributed cogeneration facility. The natural gas hydrate in the high-pressure container is intermittently delivered to the container and decomposed into fuel gas and water by the return water heated by the air conditioning load of the air-conditioning equipment, and the high-pressure fuel gas generated by the decomposition is gas turbine It is characterized by sending to gas consuming equipment such as.

Therefore, according to the present invention, electricity can be provided by the power generation by the gas turbine, while hot heat can be provided by using the gas turbine exhaust gas and cold heat by the air conditioning equipment can be provided.

Moreover, according to the present invention, as described above, the fuel gas having a predetermined pressure (1-2 MPa) can be easily obtained by injecting the refrigerating load return water (about 12 ° C.) into the high-pressure container. Therefore, in the case of a gas turbine, a gas compressor for fuel is unnecessary, so that installation cost and electric energy can be reduced.

The natural gas hydrate decomposed water is 7
It becomes cold water for air conditioning at about ℃, it is used as it is for the air conditioning load, and it becomes return water at about 12 ℃ and decomposes natural gas hydrate again. That is, since the high-pressure container has the same function as the refrigerator, the hot water absorption refrigerator normally required by adopting this method is unnecessary, and the installation cost and electric energy can be reduced. .

Further, since natural gas hydrate has a self-preserving property, it is stable under the environment of atmospheric pressure and about −15 ° C., so that there is an advantage that it can be safely stored or transported in a cold storage tank. , In the case of LNG, -162
A special tank with a double shell structure is required to maintain the temperature of ℃. In the case of CNG (compressed natural gas), 2
Since it is transported and stored in the form of high-pressure gas of about 5 to 30 MPa, it is transported and stored using a small-capacity cylinder tank, and the net transport amount and storage amount are reduced.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a distributed cogeneration facility according to the present invention.

FIG. 2 is a schematic diagram of a distributed cogeneration facility according to the present invention.

FIG. 3 is a diagram showing a dissociation curve of natural gas.

[Explanation of symbols]

11 Natural gas hydrate production facility 15 shipping containers 21 Gas turbine power generation equipment 22 High-pressure container 23 Air conditioning equipment Gas consumption equipment such as 25 gas turbines 28 Hot water boiler a'fuel gas b'return water b water c Natural gas hydrate

Claims (2)

[Claims] 1. A gas turbine power generation facility, a high-pressure vessel,
A distributed cogeneration system equipped with a hot water boiler and an air conditioning system, which uses natural gas hydrate produced by a natural gas hydrate production facility installed in a liquefied natural gas receiving terminal or a natural gas field using a transportation container. The natural gas hydrate is transported to the decentralized cogeneration facility, and the natural gas hydrate is intermittently sent from the transportation container to the high-pressure container by the decentralized cogeneration facility, and the natural gas hydrate in the high-pressure container is used by the air conditioning load of the air conditioning facility. A distributed cogeneration facility using a gas hydrate, characterized in that it decomposes into fuel gas and water by heated return water and sends the high-pressure fuel gas generated by the decomposition to a gas consuming device such as a gas turbine. 2. The distributed cogeneration facility comprises a gas turbine power generator, a pressure vessel, a hot water boiler and an air conditioning facility, and the gas turbine power generator includes an air compressor, a combustor, a gas turbine, and A pressure generator and an air conditioner are connected by a circulation pipe equipped with a circulation pump, and the pressure container and the combustor are connected by a high-pressure pipe equipped with a control valve, and The distributed cogeneration facility using a gas hydrate according to claim 1, wherein the pressure vessel is provided with a connection pipe having an opening / closing valve.