METHOD FOR OPERATING A FLUE GAS DENITRIFICATION REACTOR WHICH CATALYTICALLY DENITRIFIES FLUE GAS, AND FLUE GAS DENITRIFICATION SYSTEM HAVING A FLUE GAS DENITRIFICATION REACTOR SUITABLE FOR CARRYING OUT THE METHOD

摘要

The invention relates to a method for operating a flue gas denitrification reactor (1) which catalytically denitrifies flue gas and in which are formed a plurality of reducing agent injection zones (8), each having at least one associated reducing agent injection system (9), and a plurality of NO_x analysis zones (12), each having at least one associated NO_x analysis device (13). The method allows the flue gas stream from a steam generator of a power plant to be reliably catalytically denitrified even during operation in low load ranges. According to the invention, during operation of the flue gas denitrification reactor (1), a first starting measured NO_x value is measured downstream of the catalyst region (2) in the NO_x analysis zones (12) continuously and online for each NO_x analysis zone (12), the first starting measured NO_x values obtained are assigned in a matrix-like manner to one or more reducing agent injection zone(s) (8) and in each case to at least one value representing a partial reducing agent mass flow (31), and each partial reducing agent mass flow (31) is adjusted by injection zone, wherein each NO_x analysis zone (12) covers a portion of the flow cross-section (10) of a flue gas denitrification reactor section (11) which conducts away the clean flue gas mass flow (27), and all the NO_x analysis zones (12) together form a plane (35) which covers the flow cross-section (10).