JP2003097352A - Cogeneration system utilizing lng cryogenics - Google Patents

Abstract

PROBLEM TO BE SOLVED: To establish a cogeneration system utilizing the LGN cryogenics which realizes remotely decentralized power source from an existing LNG plant facility, and dynamically feeds the power and the heat in an interlocking manner to an external load. SOLUTION: The cogeneration system X comprises an LNG storage tank 1 to introduce LNG from an LNG plant facility P, a vaporizer 2 which introduces LNG and generates the cryogenics and boil-off gas (BOG) or gaseous hydrogen, a micro gas turbine 3 which introduces the boil-off gas (BOG) or gaseous hydrogen, and performs the power generation and heat exhaust, an output 6 for thermal load which feed the thermal energy to an external thermal load (A) via a heat exchanger 4 for cold to perform the heat exchange by introducing a refrigerant absorbing the cold in a circulating manner and a heat exchanger 5 for exhaust heat collection to perform the heat exchange by introducing the exhaust heat, and an output 7 for power load which supplies the power to the external power load (A) by the power generation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cogeneration system that uses LNG cold heat to supply electric power and use heat in response to an external load. Is a distributed power source located at a remote location from the LNG plant facility of
The present invention relates to a cogeneration system that uses LNG cold heat to flexibly supply electric power and heat. The cogeneration system is a co-generation system.
It is a common name for m). Also, heat and heat energy are used interchangeably.

[0002]

2. Description of the Related Art Conventionally, an air conditioner utilizing LNG plant equipment (for example, Japanese Patent Laid-Open No. 9-133430) is known.

Further, the evaporative gas (BO
A combined power generation plant using D) as a power generation fuel is known. (For example, JP-A-2-86926.)

On the other hand, research and development of fuel cell-related technology, which is expected as next-generation clean energy (power source), has been rapidly growing under the demand of environmental regulations for countermeasures against global warming in recent years.

Although fuel cells have various uses, the fuel cell power generator (cell stack) has been used as a power source for automobiles, households, distributed power sources, and businesses, and electric power corresponding to an external load has been used. A cogeneration system that supplies and uses exhaust heat is known.

[0006] Among them, there is a proposal of a fuel cell power generation device (PEFC) composed of a solid polymer type cell stack, or a PEFC cogeneration system using the same.
Some use hydrogen gas generated by an NG reformer as power generation fuel.

[0007]

However, there is a problem in the power generation efficiency in the practical stage and the thermal efficiency of the LNG reformer, and a cost reduction technique is still under development.

Under these circumstances, the present inventors constructed a small distributed power storage / supply system that contributes to load leveling of electric power, and in order to effectively use energy and reduce power generation cost, LNG ) Is used to research and develop a co-generation system that uses a micro gas turbine or a fuel cell power generator (PEFC) to supply power and use exhaust heat corresponding to an external load, and complete the present invention as one of the outcomes. It came to.

The present invention has been made in view of the above circumstances, and provides a cogeneration system that utilizes LNG cold heat and is connected to a home or business air conditioner with a compact structure.

[0010]

In order to solve the problems, the present invention provides a cogeneration system that uses LNG cold heat to supply power and heat corresponding to an external load.
A cogeneration system that uses a micro gas turbine or a fuel cell power generator, is a distributed power source located remotely from an existing LNG plant facility, and uses LNG cold heat to flexibly supply electric power and heat. , L
An LNG storage tank or LNG supply line for introducing LNG from an NG plant facility, and a vaporizer or LNG reformer for introducing cold LNG and vaporized gas (BOG) or hydrogen gas, and the vaporized gas (BOG). ) Or a micro gas turbine or a fuel cell power generator that introduces hydrogen gas to perform power generation and exhaust heat, a heat exchanger for cold heat that circulates and introduces a refrigerant that has absorbed the cold heat, and the exhaust heat. An output for heat load that supplies heat energy to an external heat load through a heat exchanger for exhaust heat recovery that introduces heat and an electric power that supplies power to an external power load by the power generation. A load output is provided, and the heat load output and the power load output are connected to an external load.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The embodiment of the present invention is the above-mentioned structure, wherein the external load consisting of a heat load and an electric power load is an ice storage air conditioner, and electric power, hot water supply, refrigeration / cooling of supermarkets, convenience stores, hospitals, etc. It can be applied to refrigeration and air conditioning demand.

A PEFC made of a solid polymer type cell stack is used in the fuel cell power generator.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. The power generation output may be 1 to several tens of kW, but the scaling of the scale does not affect the gist of the present invention.

As shown in the schematic diagram of the system configuration in FIG.
The system X of the present invention is a cogeneration system that uses LNG cold heat to supply power and utilize heat in response to an external load, and uses an existing LNG plant facility using a micro gas turbine 3 or a fuel cell power generator (PEFC). P
In contrast, it is a distributed power source located at a remote location, and flexibly supplies power and uses heat to an external load (A) that is interconnected.

As a concrete system configuration, the LNG storage tank 1 or L for introducing LNG from the LNG plant equipment P is used.
NG supply line [not shown], vaporizer 2 or LNG reformer [not shown] that introduces LNG to generate cold heat and evaporative gas (BOG) or hydrogen gas, and evaporative gas (B
OG) or a micro gas turbine 3 or PEFC (not shown) that introduces hydrogen gas to generate electricity and exhaust heat, and L
To the external heat load via the heat exchanger 4 for cold heat that circulates and introduces the refrigerant that has absorbed the NG cold heat to perform heat exchange, and the heat exchanger 5 for exhaust heat recovery that introduces exhaust heat and performs heat exchange. Heat load output 6 for supplying heat energy,
The power load output 7 supplies power to an external power load by power generation. System control is performed by remote monitoring. (In the figure, remote support system.)

The heat load output 6 and the power load output 7 are connected to an external load. This external load is, for example, an ice heat storage air conditioner A, which can be applied to electric power, hot water supply, cold storage / freezing, air conditioning demand, etc. in supermarkets, convenience stores, hospitals and the like.

[0017]

EFFECTS OF THE INVENTION The present invention has the above-mentioned constitution. According to this, by using LNG as a fuel, the thermal energy conventionally emitted to the atmosphere is utilized, so that the energy can be effectively utilized. It is possible to reduce the power generation cost.

Since it is compactly constructed as a cogeneration system for home and business use, the system can be constructed flexibly and at a low price.
It can be applied to electric power, hot water supply, refrigeration / freezing, and air-conditioning demand at convenience stores, hospitals, etc., and can be expected to expand usage (spread).

[Brief description of drawings]

FIG. 1 is a schematic diagram of a system configuration showing an embodiment of the present invention.

[Explanation of symbols]

1 LNG storage tank (or LNG supply line) 2 Vaporizer (or LNG reformer) 3 Micro gas turbine (or PEFC) 4 Heat exchanger for cold heat 5 Exhaust heat recovery heat exchanger 6 Heat load output 7 Power load output A Ice heat storage air conditioner [external load] PLNG plant equipment X The present invention cogeneration system

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Koji Ikuta             Chugoku Electric Power 4-33 Komachi, Naka-ku, Hiroshima City, Hiroshima Prefecture             Within the corporation F-term (reference) 5H026 AA06

Claims (3)

[Claims] 1. A cogeneration system that uses LNG cold heat to supply electric power and use heat in response to an external load, using a micro gas turbine or a fuel cell power generator, and distributing the remote location to an existing LNG plant facility. A cogeneration system that uses LNG cold heat as a power source and that flexibly supplies electric power and heat, by introducing the LNG storage tank or LNG supply line that introduces LNG from the LNG plant equipment, and the LNG. A vaporizer or LNG reformer that produces cold heat and evaporative gas (BOG) or hydrogen gas, and a micro gas turbine or fuel cell power generator that introduces the evaporative gas (BOG) or hydrogen gas to generate electricity and exhaust heat And a heat exchanger for cold heat that circulates and introduces the refrigerant that has absorbed the cold heat to perform heat exchange,
And a heat load output for supplying heat energy to an external heat load via a heat exchanger for recovering heat by introducing the exhaust heat, and an external power load by the power generation. A cogeneration system utilizing LNG cold heat, comprising a power load output for supplying electric power, and connecting the heat load output and the power load output to an external load. 2. The cogeneration system utilizing LNG cold heat according to claim 1, wherein the external load including the heat load and the electric power load is an ice heat storage air conditioner. 3. The cogeneration system utilizing LNG cold heat according to claim 1, wherein the fuel cell power generation device comprises a solid polymer type cell stack.