Exhaust gas from the boilers in the textile industry generates a lot of energy that goes to waste if not captured and utilized optimally. This study presents a way to recovery heat waste from boiler exhaust gas using a shell and tube heat exchanger. Exhaust gas from boiler dyeing processes carries a large amount of heat. The waste energy from the same can be decreased by using waste-heat recovery systems.
In this study, using ANSYS simulation, a thermodynamic analysis was performed. An energy-based approach was used for optimizing the effective working condition for waste-heat recovery with exhaust gas to air shell and tube heat exchanger. The variations of parameters, which
affect the system performance such as, exhaust gas and air temperature, velocity, and mass flow rate, and moisture content are examined respectively. For the experiment, a separate heat exchanger was designed with tubes in which the exhaust gas is allowed to pass through
the shell side to achieve a higher surface area on the gas
side. The major criterion in the design of a waste heat
recovery system is the proper selection of heat exchangers
with optimum conditions.
Energy and environmental studied show that in the increase of process efficiency, thermal waste from the boiler was reduced. The economic evaluation showed that the payback period of the heat exchanger is approximate 6 months; the Internal Rate of Return (IRR) is 182%.
Read More: Waste heat recovery from boiler of large-scale textile industry
