JPH06168730A - Power generation system - Google Patents

Abstract

PURPOSE:To simplify cooling facility to obtain cooling water to be supplied to an intercooler for improving compression efficiency of working fluid. CONSTITUTION:A power generation system is provided with an absorption type freezer 6, a gas engine 1 to generate waste heat as heat source for the absorption type freezer 6, and a fuel cell 2. When required power is smaller than power generated at the gas engine 1 and the fuel cell 2, the compressor 14 is driven by excessive power of it to compress natural gas, and the natural gas is stored in a tank 15 as compressed gas. When demand for power is increased, a power generation expansion turbine 16 is driven using the stored compressed gas. In addition, cooling water generated at the absorption type freezer 6 is supplied to the intercooler 17 of the compressor 14 to cool the natural gas which is compressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power generation system provided with an absorption refrigerating machine and a power generator for generating exhaust heat which can be a heat source of the absorption refrigerating machine.

[0002]

2. Description of the Related Art In the power generation system as described above, when the demand power is less than the power generated by the power generator, the surplus power is conventionally used to drive the compressor with the surplus power in order to use the surplus power without waste. ,propane gas,
Compress working fluid such as Freon gas and natural gas (A13), store the working fluid as compressed gas or liquid, and drive the expansion turbine for power generation using the stored compressed gas or liquid when the power demand increases By doing so, electric power is generated and the shortage of the demanded electric power can be covered.

[0003] Conventionally, when the temperature of the working fluid is low, the compression efficiency can be increased when the compressor is compressed. Therefore, an intercooler is provided in the compressor and a cooling tower is provided to obtain cooling water to be supplied to the intercooler. Such cooling equipment is provided, and water is circulated between the intercooler and the cooling equipment to cool the working fluid.

[0004]

However, in the prior art, since a dedicated cooling facility is provided to cool the working fluid, the initial cost and running cost increase, which is disadvantageous in that it is uneconomical. .

The present invention has been made in view of such circumstances, and the power generation system of the invention according to claim 1 obtains cooling water to be supplied to the intercooler for improving the compression efficiency of the working fluid. The purpose of the present invention is to simplify the cooling equipment and to economically cool the working fluid, and the power generation system of the invention according to claim 2 stores cold water obtained in the absorption refrigerator. It is an object of the present invention to make it possible to economically cool a cold water storage tank.

[0006]

In order to achieve the above-mentioned object, the power generation system of the invention according to claim 1 generates an absorption refrigerating machine and exhaust heat which can be a heat source of the absorption refrigerating machine. When the demand power is less than the power generated by the power generation device, the compressor is driven by the surplus power to compress the working fluid, and the working fluid is stored as compressed gas or liquid. In the power generation system that generates electric power by driving the expansion turbine for power generation using the stored compressed gas or liquid when the demand increases, the cold water generated in the absorption refrigerator as the cooling water for the intercooler of the compressor. To be used.

In order to achieve the above-mentioned object, the power generation system of the invention according to claim 2 has the above-mentioned claim 1.
A cold water storage tank is attached to the absorption refrigerating machine according to 1, and the liquid in the cold water storage tank is cooled by the cold heat generated when the working fluid is expanded by the expansion turbine for power generation.

[0008]

With the structure of the power generation system according to the first aspect of the present invention, the intercooler can be cooled by using the cold water generated in the absorption refrigerator.

According to the configuration of the power generation system of the invention of claim 2, the cold heat generated when the working fluid is expanded in the expansion turbine for power generation can be utilized to cool the liquid in the cold water storage tank. it can.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a flow chart showing an embodiment of a power generation system according to the present invention. Reference numeral 1 is a power generation gas engine as a power generation device, 2 is a fuel cell as a power generation device, and a power generation gas engine 1 is shown. And fuel cell 2
A gas supply pipe 3 is connected to each.

Each of the engine cooling water pipe 4 of the power generation gas engine 1 and the exhaust heat recovery pipe 5 of the fuel cell 2 is connected to a double-effect absorption refrigerator 6, and the absorption refrigerator 6 is cooled with cold water. A cold water storage tank 7 for storing the cold water and a hot water storage tank 8 for storing the hot water are additionally provided, and the cold water and the hot water are taken out by exhaust heat from the gas engine 1 for power generation and the fuel cell 2, respectively.

From the power generation gas engine 1 to the absorption refrigerator 6
The temperature of the cooling water supplied to the engine is about 85 ° C, and the temperature of the cooling water returned to the power generation gas engine 1 is about 80 ° C. Also,
The temperature of the exhaust gas supplied from the fuel cell 2 to the absorption refrigerator 6 is about 170 ° C, and the temperature of the exhaust gas returned to the fuel cell 2 is about 90 ° C.

A collecting line 9 for taking out the electric power generated therein is connected to the power generating gas engine 1, and the collecting line 9 is connected to the collecting line 9.
The fuel cell 2, the solar cell 10, and the wind turbine generator 11 are
It is connected via inverters 12 and 13 that convert direct current to alternating current.

A compressor 14 for compressing the natural gas is connected to the natural gas supply pipe 3, a tank 15 for storing the compressed natural gas is connected to the compressor 14, and the compression from the tank 15 is performed. Expansion turbine 16 for power generation operated by the generated natural gas
Is provided and the collecting line 9 is connected to the expansion turbine 16 for power generation, and when the demand power is less than the power generated by the power generation gas engine 1, the fuel cell 2, the solar cell 10 and the wind turbine generator 11, The surplus electric power drives the compressor 14 to compress the natural gas, and the natural gas is stored as the compressed gas in the tank 15. When the power demand increases, the stored compressed gas is used to drive the expansion turbine 16 for power generation. It is configured to generate electric power by being driven, and to be able to take out electric power that is equal to or larger than the capacity set by the gas engine for power generation 1, the fuel cell 2, the solar cell 10, and the wind turbine generator 11. The natural gas expanded by the expansion turbine 16 for power generation is returned to the gas supply pipe 3 via the return pipe 20.

The intercooler 1 for the compressor 14
7 is provided, and the cold water pipe 18 of the absorption refrigerator 6 is connected to the intercooler 17, so that the natural gas in the compressor 14 is cooled by the cold water generated in the absorption refrigerator 6 to improve its compression efficiency. It is configured.
The temperature of the cold water supplied from the absorption refrigerator 6 to the intercooler 17 is about 7 ° C, and the temperature of the cold water returned to the absorption refrigerator 6 is about 12 ° C.

The cold water storage tank 7 and the expansion turbine 16 for power generation are connected via a cold heat recovery pipe 19, and the cold water generated when the natural gas is expanded by the expansion turbine 16 for power generation removes the cold water in the cold water storage tank 7. It is designed to be cooled.

In the above embodiments, the solar cell 10 and the wind power generator 11 are shown as the power generators using natural energy, but the power generators are not limited to them.
Various power generation devices such as a wave power generation device, a geothermal power generation device, a power generation device using the temperature difference of seawater, and a tidal power generation device using the ebb and flow of tide can be applied.

As the gas to be compressed by the compressor 14, butane gas, propane gas, chlorofluorocarbon gas, etc. can be applied, and when these are compressed and stored in the tank 15, a gas such as propane gas, chlorofluorocarbon gas which is easily liquefied. In this case, the liquid may be stored as a liquid.

[0020]

As is apparent from the above description, according to the power generation system of the first aspect of the invention, the cold water generated in the absorption refrigerator is used as the cooling water to be supplied to the intercooler. Cooling to obtain the cooling water to be supplied to the intercooler can be achieved by simply connecting the cold water flow path of the absorption chiller to the intercooler via a cold water pipe without installing a dedicated cooling facility such as a cooling tower to obtain the cooling water to be supplied. The equipment can be simplified and the working fluid can be cooled economically.

According to the power generation system of the second aspect of the present invention, the cold heat generated when the working fluid is expanded in the power generation expansion turbine is used for cooling the liquid in the cold water storage tank. The dedicated equipment for maintaining the liquid at a predetermined temperature can be dispensed with, and the cooling of the cold water storage tank for storing the cold water obtained by the absorption refrigerator can be economically performed.

[Brief description of drawings]

FIG. 1 is a flowchart showing an embodiment of a power generation system according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Gas engine as a power generator 2 ... Fuel cell as a power generator 6 ... Absorption type refrigerator 7 ... Cold water storage tank 14 ... Compressor 16 ... Expansion turbine 17 for power generation ... Intercooler

Claims (2)

[Claims] 1. An absorption refrigerating machine, and a power generator that generates exhaust heat that can serve as a heat source for the absorption refrigerating machine, and when demand power is less than the power generated by the power generator,
The surplus power drives the compressor to compress the working fluid, store the working fluid as compressed gas or liquid, and use the stored compressed gas or liquid to drive the expansion turbine for power generation when the power demand increases. A power generation system that generates electric power by doing so, wherein cold water generated in the absorption refrigerator is used as cooling water for the intercooler of the compressor. 2. A power generation system in which a cold water storage tank is attached to the absorption refrigerator according to claim 1, and the liquid in the cold water storage tank is cooled by cold heat generated when a working fluid is expanded by an expansion turbine for power generation. .