Energy balance and cogeneration for a cement plant

✍ Scribed by Shaleen Khurana; Rangan Banerjee; Uday Gaitonde

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 178 KB
• Volume: 22
• Category: Article
• ISSN: 1359-4311
• DOI: 10.1016/s1359-4311(01)00128-4

✦ Synopsis

The cement industry is an energy intensive industry consuming about 4 GJ per tonne of cement produced. A thermodynamic analysis for cogeneration using the waste heat streams is not easily available. Data from a working 1 Mt per annum plant in India is used to obtain an energy balance for the system and a Sankey diagram is drawn. It is found that about 35% of the input energy is being lost with the waste heat streams. A steam cycle is selected to recover the heat from the streams using a waste heat recovery steam generator and it is estimated that about 4.4 MW of electricity can be generated. This represents about 30% of the electricity requirement of the plant and a 10% improvement in the primary energy efficiency of the plant. The payback period for the system is found to be within two years.