Abstract
Existing complicated and complex calculation procedures for the design of process tubular furnaces create the main reason why the connection of targeting and detail design stage of furnaces (i.e., the continuous design and/or retrofit approach) is a serious problem in design practice. A complex, newly developed approach of furnace design and/or retrofit is presented in this paper. This comprehensive approach involves the application of heat transfer (radiation and convection) in equipment design, thermodynamic analysis for process design from the point of view of furnace integration, and the latest approach consisting in involving process fluid flow and hydrodynamic analysis to avoid potential problems in operation. This new methodology bridges existing gaps between modern targeting methods based on pinch analysis (providing optimized parameters such as the temperature of preheated air, stack temperature, and excess air) and the detailed design of furnaces. It is partly interactive and based on three stages of design: targeting, synthesis, and detailed design. It can be applied for both grassroots and retrofits problems.
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