Application Of Economizer For Waste Heat Recovery From Exhaust Flue Gas In Steam Boiler: A Case Study In A Biscuit Factory

In the present work, the useful concept of energy utilization is analyzed and implemented to the steam boiler system. Energy flows in the steam boiler system have been shown in this work. Energy efficiency and losses have been determined as well. Energy losses are found to be 18.88%. 7.37 % of the total losses is emitted by a waste heat of exhaust flue gas. This work also presents a case study of recovering the waste heat of exhaust flue gas by applying a condensing economizer. From the analysis results, it reveals that energy saving amount as natural gas is 21724,8 m3/year. Thus, applying of the condensing economizer in a profit of about 7760 $/year and a reduction of 27,13 tons CO2 emission per year. As a result, calculated energy saving amount for the investment cost of the economizer corresponds to about 1,13 year according to the payback period analysis method.