Greater understanding of the damage that emissions cause to our natural environment and the health hazards associated with it has increased the support and demand for cleaner, environmentally safe power generation around the world. Stringent regulations established by governments mandate that alternate, cleaner fuels be used in power generation especially at the industrial level.

CAI is committed to supporting the power generation needs of its clients with innovative methods using renewable sources as fuels. Its Spirit line of power plants can be configured to use a range of renewable resources and synthetic gas from municipal solid waste to generate electricity.

CAI offers the following renewable energy power plants:

• Bio-Mass
• Digester Gas (Anaerobic Digestion)
• Landfill Gas
• Municipal Solid Waste
• Used Tires
• Coal Gasification

Linked with modern combustion and steam turbine-generators, gasification is one of the most efficient and environmentally benign way of producing electricity from coal and pet-coke. While natural gas combined cycle systems exceed gasification systems in power generating efficiency, the relatively high price and declining availability of domestic natural gas resources make gasification increasingly attractive for power producers.

In the power production process (seen in a representative diagram below), purified syngas from the gasification side of the plant or gasification island is supplied to the power side of the plant or power island. The syngas is mixed with air and ignited to drive the combustion turbine directly in a combined thermal and mechanical process that is converted to electrical power by the generator. The electrical power from the generator IS then fed to the electrical grid for distribution.

Waste heat from the combustion turbine is then used to boil water in the heat recovery steam generator and create the steam to drive a steam turbine with its own generator set. Combined cycle operation facilitates energy conversion efficiency that is about one-third greater than possible using a gas turbine only.

The IGCC system consists of:

• Oxygen-blown entrained flow, two stage coal gasifier capable of utilizing high sulfur bituminous coal.
• Air separation unit.
• Gas conditioning system for removing sulfur compounds and particulates.
• Systems or mechanical devices for improved coal feed and all necessary coal handling equipment.
• Combined cycle power generation system wherein the gasified coal syngas is combusted in a combustion turbine generator and steam from HRSG is used to produce supplementary power.
• Heat recovery steam generator.
• Slag/Ash handling facility.
• Coal slurry mixing plant.
• Coal handling and storage facility.

Used Tires Microwave Application

CAI offers its Spirit 1 MW and Spirit 2 MW power plants with a gasification and gas clean-up system for waste-to-energy application. The tire-derived fuel gas is used to power the system.

Waste-To-Energy Application

CAI helps put waste to good use. Its Waste-To-Energy application takes Refuse Derived Fuels (RDF) from municipal solid waste, Tire Derived Fuel (TDF) from used tires, and Landfill Methane Gas (LFG) and uses them for electricity generation.