Co-generation plants are also called Combined heat and power plants. In a cogeneration plant, unlike in a combined cycle plant, steam generated in the Heat Recovery Steam Generator is used for processing in industries. Co-generation plants are installed in
industries like fertilizers, chemicals and refineries, where there is need for both steam and power. Co-generation plants can be designed to any ratio of heat and power depending on the need of the industry. The schematic of a cogeneration cycle is shown above.
The process is also depicted by the T– diagram of the above image. The area A-B-C-D-E-F-G represents the total heat recovered in the cogeneration plant. The efficiency of heat recovery is very high in co-generation plants, as mainly the loss of heat is only in the flue gasses exiting in the boiler stack. Lower the gas temperature, higher will be the efficiency of co-generation and co-generation plants are designed for efficiency as high as 90% and more
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