Abstract
Abstract In any thermal power plant the major energy loss takes place in the condenser through its cooling water system. The objective of the present study is to convert this low grade waste heat from a 500 MWe subcritical coal-fired power plant into electricity by integrating Kalina Cycle System 11 (KCS 11) where ammonia-water binary mixture is used as working fluid. A computer simulation programme has been developed by MS-Excel and VBA to analyze the combined cycle plant configuration and parametric optimization based on thermodynamic equations. The parametric study is carried out based on variation of ammonia mass fraction and cooling water flow rate by keeping saturated vapour condition at turbine inlet. Result shows that the Kalina cycle is able to add about 13.49MWe electric power with a net cycle efficiency of 2.58%. There is an optimum cooling water flow rate that yields the maximum net cycle efficiency for a particular condenser design value in the Kalina cycle. Effect of ammonia mass fraction variations in the binary mixture is also studied by fixing turbine inlet temperature at 312.308K. The study shows that cycle performance improves with higher ammonia mass fraction. Effect of temperature rise across the main plant condenser increases the overall plant efficiency. Around 3.3 ton/h of CO2 emission can be reduced by electric power addition with the help of utilizing the condenser heat loss.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
