Modeling and Tech Economics Feasibility of Using Heat of flue Gases of Cement Plant for Cogeneration of electricity and heat

The Cement industry is one of the highest energy consuming industriesin the world. The cement industry consumeda large part of total energy. A large portion of this energy iswasted byexhaust gases fromthe chimney and ventedto the atmosphere. With using the time value of money in payback period, in this study, thefeasibility of using hot chimneygases from BojnourdCement Company chimneys to cogenerate heat and power system has been investigated. Theminimum temperatures of the hotgases from the chimney NO. I and II were 130oC and 250oC, respectively. The thermal energy of the chimney gases wasused to convert inlet water stream to superheated vapor. The results revealed that using an energy recovery system at this plantand generating electricity, it could be possible to return the investment in 2.26 years. Finally, thetemperature of theexhaust gases from combined heat and power generation system reached to 112oC and 104oC.