System Configuration

The 1000 kW on—site PAFC power plant is being developed as a regeneration system that can be installed in a large building in an urban setting, and the following concepts were identified as the development and design targets:

• For installation in large building complex in urban setting (on—site type) ;

• For supplying electrical power and thermal energy (to be especially efficient in supplying the energy for air-conditioning of large buildings) ;

• Compact and well-integrated configuration for easy transportation to and installation ;

• Highly reliable and durable.

Table 1 summarizes the main target specifications for. this plant, and Figure 1 shows the system flow diagram of this plant Simplicity and high-reliability were given high priorities in developing and designing the basic system configuration.

To meet the targets, a plant design was considered that can produce waste heat recovery in the form of high-temperature (170°C) steam so that building's air-conditioning demand be supplied efficiently with an absorption chiller while achieving the target electrical efficiency. The semi—indirect steam output system was developed that combines direct steam generation by a steam separator and a heat exchanger type steam generator. And the steam recovery efficiency was improved by lowering the reforming steam/carbon ratio and by using heat exchange between the fuel cell coolant and the supply air.

A package skid method was adopted for the integration of the plant equipment so that the equipment can be manufactured and assembled in factories, then packages can be installed and combined simply at the site, and the plant can be easily transported over land and carried into the installation site. The plant completed has overall dimensions of 12.5 m in width, 8 m in depth, and 3.6 m in height (height is 3.2 m except for cell stack and reformer) and footprint of 100 m2(0.1m2/ kW), thus achieving the compactness target.

Table 1. Target Specifications of 1000 kW Plant

-__ 1 Specifications

Rated output

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