Diseño conceptual de un sistema de precalentamiento de agua blanda de alimentación para caldera pirotubular

Abstract

PROJECT PUBLICATION CONDITIONS. The growing energy demand of the industrialized sectors in each country leads to the search for measures to make energy generation more efficient in chemical plants by taking advantage of residual sources such as flue gases. This project was based on a fire-tube boiler with intermittent feed from the Unit Operations Laboratory at ESPOL. The need to increase the temperature of the water entering the boiler led to the conceptual design of an economizer, shaped as a bank of pipes, to recover the energy remaining in the fumes resulting from the combustion of Diesel 2. The final design of the economizer consisted of 28 tubes arranged in 7 rows and 4 columns inside a shell measuring 50 cm in length, 21.1 cm in width, and 40 cm in height. This setup allows the incoming water temperature to be increased from 27°C to 50°C, while reducing the gas flow temperature to 80°C from the initial 305°C. The design was validated using Aspen HYSYS® software, achieving a maximum diesel savings of 0.18 gal/h, a reduction in gas flow of up to 8%, and a payback period of 5 years and 7 months. KEYWORDS: Economizer, Aspen HYSYS, heat transfer, fuel, fire-tube boiler.