Numerical optimization of water tube boiler energy recovery using a new economizer

Abstract

economizer. Due to fulfill of this request, the effects of the presence of ash on the pipes and sediment inside the pipe features and optimization of a complex heat exchanger (3D) equipped with bare and finned tubes are studied. In this work, the effects of distance between the tubes have been investigated. Based on obtained results, for the economizer equipped with finned tubes, determination of optimal tube pitch to have more boiler efficiency is essential. After installing the economizer, the boiler performance test is performed so that the simulation results are validated and verified in practice. When the economizer operated at 70% working load, equipping with an economizer will save 9,500 tons of gas fuel and for five steam boilers, the gas fuel will be reduced by 47 thousand tons at one year. In conclusion, the arrangement with outer helical fins having di =43.8 mm, do = 50.8mm, t = 1.3 mm, l=4900 mm with 2.75*7*4.54 m economizer are studied with different tube distances, and SL=150 mm is presented as the optimal model with the highest performance between all configurations.