JPH07169483A - Fuel cell power plant - Google Patents

Abstract

PURPOSE:To most efficiently take an electric output and a cooling output for cooling by providing a heat converting device in a cell cooling water line in a fuel cell power plant. CONSTITUTION:An absorption refrigerator 2 is set just after the outlet piping of a cell body 1, and a cold water piping 3 from the absorption refrigerator 2 is used as it is as the cold water source for a cooling fan unit. The cooling water utilized in the absorption refrigerator 2 and reduced in temperature separates the steam for reforming reaction in a steam separator 4 similarly to a general fuel cell plant. Further, the cell cooling water is recirculated through a circulating pump 5 and a cooler 6 for reducing the temperature of the cooling water to the optimum temperature of the cell inlet port. Thus, a heat source having the highest temperature can be utilized as the absorption refrigerator input, and the waste heat can be efficiently utilized.

Description

Detailed Description of the Invention

[0001]

This invention relates to a fuel cell power plant.

[0002]

2. Description of the Related Art A fuel cell power plant is used not only as an electric power source for private power generation but also as a hot water supply, cooling and heating, and other heat utilization by taking advantage of the fact that it is close to the place of demand.

A power plant using a fuel cell is highly efficient even in a small size, can diversify fuels, and can effectively utilize exhaust heat. It has some excellent features such as being able to be installed near the site. Therefore, the introduction is planned actively in each field, and the installation of demonstration plants is also active. It is also promising as a future power generation device that NOX, SOX, dust and the like in the exhaust gas have extremely low values as compared with other power generation facilities.

[0004]

One of the main purposes of utilizing exhaust heat of a fuel cell plant is effective utilization for cooling using an absorption refrigerator. However, since it is originally positioned to utilize the exhaust heat, the temperature of the exhaust heat is uniquely determined, and it is not in a situation in which the absorption refrigerator is operated efficiently.

An object of the present invention is to provide a fuel cell power generation plant in which an electric output and a cooling water output for cooling are most efficiently taken out by considering a fuel cell power generation plant and an absorption refrigerator in the same position.

[0006]

In the configuration of the fuel cell power plant, the absorption refrigerator is installed at the position of the heat level at which it can operate efficiently.

[0007]

The temperature level of the absorption refrigerator with hot water is equivalent to the temperature level of the outlet of the battery main body of the battery cooling water device.

[0008]

FIG. 1 shows an embodiment of the present invention. Battery body 1
Generates heat during power generation operation, and is therefore equipped with a battery cooling water system intended for cooling. Further, since the operating temperature of the battery main body 1 is 200 ° C., the battery cooling water system is inevitably suppressed to 200 ° C. or less, and the effective use of exhaust heat is restricted. Absorption chillers used for cooling in the market are 170 to 18
The lower limit is 0 ° C, which corresponds to the highest temperature of the battery cooling water system. Therefore, the absorption refrigerator 2 can use the hottest water. It is installed immediately after the outlet pipe of the battery body 1 and uses high-temperature cooling water as a heat source. Absorption refrigerator 2
The cold water pipe 3 is used as it is as a cold water source of the cooling fan unit. The cooling water, which has been used in the absorption refrigerator 2 and has lowered in temperature, is separated into the steam for reforming reaction by the steam separator 4 as in the case of a general fuel cell plant. Further, the battery cooling water is recirculated through the circulation pump 5 and the cooler 6 which lowers the temperature of the cooling water to the optimum temperature at the battery inlet.

In the conventional method, the steam of the absorption refrigerator (steam input) is taken out from the steam separator 4, but this method makes it difficult to operate the absorption refrigerator efficiently because the steam temperature becomes low. Met. According to the present invention, since the highest temperature heat source can be used as the input of the absorption refrigerator, the exhaust heat can be used more efficiently.

[0010]

As described above, according to the present invention, as cooling air waste heat utilization, which is in great demand, it is possible to take out cold water directly from the fuel cell, and to efficiently discharge it as compared with the conventional combination. It became possible to convert heat into cold water.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a main part of a cold water exhaust heat type fuel cell according to the present invention.

[Explanation of symbols]

 1 ... Battery body 2 ... Absorption type refrigerator 3 ... Cold water piping 4 ... Steam separator 5 ... Circulation pump 6 ... Cooler

Claims (2)

[Claims] 1. A fuel cell power plant in which a heat conversion device is provided in a cell cooling water line. 2. The fuel cell power plant according to claim 1, wherein an absorption refrigerator is installed in the heat conversion device.