1321 Compressed Natural Gas CNG

CNG is stored in welding bottle-like tanks at pressures over 3000 psig. CNG and LNG are both delivered to the internal combustion engines at low vapor pressure (< 300 psig). A complication with all natural gas and NGL fuels is that they are naturally odorless. A sulfur-bearing amyl mercaptan that is readily identified by smell is added for safety. Even trace amounts of the mer-captans are detrimental to the performance of advanced internal combustion (IC) engine emission reduction systems and fuel cells. Mercaptan removal systems or alternative additives will be required before these treated fuels are acceptable for use in sensitive generation equipment.

In the U.S., natural gas is typically transported by large FERC-regulated interstate pipeline companies, then delivered to local distribution companies that deliver low-pressure natural gas to consumers. Natural gas is stored by:

• Line pack — varying the pressure within the pipeline system to handle daily imbalances between supply and demand of natural gas

• Salt dome or underground cavern storage — used to provide large volumes of natural gas for heavy demand periods, such as extreme cold weather or supply outages caused by hurricanes.

• Depleted reserve storage — used to handle seasonal peaking requirements (this storage must typically be cycled each season)

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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