631 Fuel Cell Design

A fuel cell power system embodies more than just the fuel cell stack, and the design of a fuel cell system involves more than the optimization of the fuel

TABLE 6.1

Comparison of Key Features of the Four Fuel Cell Types Under Serious Consideration for Distributed Power Generation (Hirschenhofer et al., 1998, with permission)

MCFC

PAFC

PEMFC

SOFC

Electrolyte

Immobilized

Immobilized

Ion exchange

Ceramic

liquid molten

liquid

membrane

carbonate

phosphoric acid

Operating

650°C

205°C

80°C

800-1000°C now,

temperature

600-1000°C in 10-15 years

Charge carrier

CO3-

H+

H+

O-

External reformer

No

Yes

Yes

No

for CH4 (below)

Prime cell

Stainless steel

Graphite-based

Carbon-based

Ceramic

components

Catalyst

Nickel

Platinum

Platinum

Perovskites

Product water

Gaseous

Evaporative

Evaporative

Gaseous product

management

product

Product heat

Internal

Process gas +

Process gas +

Internal

management

reforming +

independent

independent

reforming +

process gas

cooling medium

cooling medium

process gas

cell section with respect to efficiency or economics. It involves the minimization of the cost of electricity (or cogenerated product) within the constraints of the desired application. For most applications, this requires that the fundamental processes be integrated into an efficient plant with low capital costs. Often, these objectives are conflicting, so compromises or design decisions must be made. In addition, project-specific objectives such as desired fuel, emission levels, potential uses of rejected heat (electricity, steam, or heat), desired output levels, volume, or weight criteria, all influence the design of the fuel cell power system.

Solar Stirling Engine Basics Explained

Solar Stirling Engine Basics Explained

The solar Stirling engine is progressively becoming a viable alternative to solar panels for its higher efficiency. Stirling engines might be the best way to harvest the power provided by the sun. This is an easy-to-understand explanation of how Stirling engines work, the different types, and why they are more efficient than steam engines.

Get My Free Ebook


Post a comment