661 Primary Fuels

The primary fuels used in fuel cell systems today include natural gas, hydrogen, and methanol. The most common fuel used in fuel cell systems developed for distributed generation is natural gas. Natural gas is widely available in many countries at reasonable prices and is, therefore, the primary fuel of choice. Typically, a natural gas fuel processor is integrated into the system design for a fuel cell power plant. This integration requires the supply of heat to the fuel processor to overcome the endothermicity associated with reformation chemistry. This heat can be supplied by the fuel cell (e.g., exhaust flow into the fuel processor) or by a combustor (auxiliary or anode gas reactor). The most common strategy uses steam reformation over a catalyst, but many other reformation technologies are available, including partial oxidation and autothermal reformation. When steam reformation is used, steam must be supplied to the fuel processor; the steam can be provided through the fuel cell exhaust stream or a separate steam generator. Other fuels that can be used in fuel cell systems today include hydrogen, which can be used directly in all fuel cell types, and methanol, which can be used directly only in a direct methanol fuel cell but can easily be reformed for use in other fuel cell systems.

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.

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