Regenerative air preheaters with four channels in a power plant system

A traditional regenerative air preheater for power plants has two channels for flue gas and air. This study investigates a regenerative air preheater with four channels as a way of recovering some waste heat from flue gas. The mathematical model equations and assumptions regarding regenerative air preheaters are initially established. The governing differential equations for simultaneous heat transfer in the preheater are obtained according to these assumptions. The equations are non‐dimensionalized by dimensionless variables and parameters. The computer program developed to solve the governing differential equations is based on the finite difference method, represented by the Gauss‐Seidel iterative procedures scheme. If the convergence conditions and error criteria are satisfied, then the fluid temperatures and heat efficiency of a regenerative air preheater can be solved for. Numerical results indicate that increasing the number of channels from two to four can increase the effectiveness of heat transfer.

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