A power plant, powerhouse, or generating plant is an industrial facility that produces electrical power. The key source for producing the electricity is a generator, a rotating machine that uses mechanical power to create electrical power. The source of energy for turning the generator varies widely. Much of it depends on the cost of fuels and the technology available to the power company. Most power stations burn fossil fuels (coal and oil) and natural gas while others use nuclear power or renewable sources (solar, wind farms, wave, and hydroelectric) to power the generator.
With new Environmental Protection Agency (EPA) regulations, power plants are required to cut down on the emissions related to fossil fuels (coal). The process commonly used is called Selective Catalytic Reduction (SCR). A post-combustion NOX reduction technology in which ammonia (NH3) is added to the fuel gas passing through layers of a catalyst. The ammonia and NOX react on the surface of the catalyst and form harmless nitrogen (N2) and water vapor.
SCR has the highest NOX reduction level and is well accepted by the industry. Technologies are changing rapidly in the NOX reduction but ammonia is considered the most effective NOX reducing agent for SCR systems. Anhydrous ammonia, aqueous ammonia, and urea are the three types of NOX reducing agents for Ammonia-based SCR systems.
Corken reciprocating compressors are utilized in anhydrous ammonia SCR systems. Anhydrous ammonia is the most effective NOX reducing agent used in SCR systems. However, due to its hazardous nature, this form of ammonia can incur high compliance costs and safety concerns related to transportation, storing, and handling. This technology has been in use in Europe since the 1980’s.
Non-toxic urea is transported as a granular solid. It is mixed with water on site and converted to ammonia. This technology has recently gained a lot of interest from end-users due to minimal safety concerns.
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