Integration of low-grade heat from exhaust gases into energy system of the enterprise

The paper presents a Process Integration application for waste heat utilisation from exhaust gas streams with partial condensation. It is based on the hot composite curve construction representing gaseous mixture cooling accounting condensable vapour part's gas–liquid equilibrium. With cold requiring heating, Pinch Point determined. On this basis, exchanger network (HEN) structure utilised integration into factory's energy system developed. accounts possible splitting of two-phase flow and liquid plate (PHE) type selection specific positions in HEN. method illustrated by case study gases after superheated steam tobacco drying flue natural gas-fired boiler. Heat transfer areas PHEs HEN are optimised total annualised cost as an objective function. received solution's payback period less than four months, substantial saving energy, up to 10.9 TJ/y. also leads reduction CO2 emissions 600 t/y. About 3830 t/y not discharged atmosphere water returned production process. To manuscript “Integration Low-Grade Exhaust Gases Energy System Enterprise”