The aim of this research was to examine the possibilities of NO, emission abatement from high temperature industrial furnaces by controlling the gasdynamic parameters of natural gas flames. Thc following parameters were investigated: air and gas velocity at burner exit, air swirl angle, position of the burner nozzles and air staging. It has been shown that moderateswirling ofthecombustion air enhances the level of NO,, the lowest NO, emissions are observed for parallel air and gas flow burners. It is also demonstrated that to attain successful NO, abatement it is necessary to realize sufficient mixing ofthe flue gases with the combustion air before the flame temperature reaches its maximum value. The developed burner, enabling successful abatement of the maximum flame temperature, presents a large potential of industrial applications as a tool for NO, emission reduction from high temperature furnaces.

PRESSURIZED RECUPERATOR FOR HEAT RECOVERY IN INDUSTRIAL HIGH TEMPERATURE PROCESSES CIŚNIENIOWY REKUPERATOR DO ODZYSKU CIEPŁA Z PRZEMYSŁOWYCH PROCESÓW WYSOKOTEMPERATUROWYCHRecuperators and regenerators are important devices for heat recovery systems in technological lines of industrial processes and should have high air preheating temperature, low flow resistance and a long service life. The use of heat recovery systems is particularly important in high-temperature industrial processes (especially in metallurgy) where large amounts of thermal energy are lost to the environment. The article presents the process design for a high efficiency recuperator intended to work at high operating parameters: air pressure up to 1.2 MPa and temperature of heating up to 900°C. The results of thermal and gas-dynamic calculations were based on an algorithm developed for determination of the recuperation process parameters. The proposed technical solution of the recuperator and determined recuperation parameters ensure its operation under maximum temperature conditions.

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