Conventional versus specific types of heat exchangers in the case of polluted flue gas as the process fluid – A review

Abstract

The present contribution shows certain practical aspects of selection and design of heat exchangers for industrial applications where polluted flue gas (off-gas) represents one process fluid.One of the key factors in designing heat exchangers for these applications is the primary selection of a suitable type. The presently available possibilities and methodologies of efficient heat exchanging device selection and supporting software do not allow covering all the needs of related industries. A concrete example of an industrial process furnace is used to demonstrate the issues of "compactness and enhancement vs. reliability" for various temperature levels of high temperature applications. Attention is also given to the specific area of fouling of the heat exchanging surfaces by flue gas.In high-temperature applications, it is necessary to pay special attention to all phases of a solution. Heat integration of devices into the plant system and its possibilities are presented. The irreplaceable role of modelling and optimization on the design of heat exchangers and its design details is emphasized which may significantly contribute to final product quality. An important role in high-temperature applications is also played by CFD simulations.

Thermo-economic optimisation of industrial milk spray dryer exhaust to inlet air heat recovery

“…The duty of the finned tube exhaust exchanger system fell to 3.0 MW at the end of the dryer production cycle after fouling. The finned round tube had the greatest amount of deposition resulting in an 8% reduction in heat recovery, which is similar heat transfer reductions experienced in boilers [25], and an increase in pressure drop for the exhaust exchanger of 5%, which is very modest. The bare round tube exhaust heat exchanger began with a duty of 2.7 MW, which fell to 2.6 MW at the end of the dryer run, and a pressure drop increase of 2%.…”

Modeling, simulation and optimization in waste/biomass-to-energy processes

“…filters and heat exchangers are the most common elements that are analyzed and/or modeled using CFD [19]. Fig.…”

Waste Heat Recovery From Boiler of Large-Scale Textile Industry

“…For simulation several well-known commercial software packages are used like e.g., ASPEN PLUS, ChemCAD, Pro II, HYSYS (Stehlik, 2011), however, for some special areas like thermal processing of waste including energy utilization a creation of own software packages proved itself to be good solution. There are using specific software ANSYS which is suitable to gas-to-gas waste-heat recovery exchangers.…”

“…There were use for lower temperatures in flue gas (off-gas) application is technically possible but is economically too expensive. Therefore, most requirements for common high temperature flue gas industrial applications (up to 1000°C) use metallic mateerials (Stehlik, 2011). Pandiyarajan et al (2011) have performed experiments on heat recovery from diesel engine exhaust using finned shell and tube exchanger and thermal storage system.…”