Design of Basic Technological Units of SCR Technology for Flue Gas Denitrification

Abstract

The thesis deals with the design of the basic reactor design of the SCR flue gas denitrification method. The flue gas is fed from the gaseous fuel combustion process, its composition, the NOx value of the raw flue gas and the desired NOx emission value are known. The flue gas flow, temperature at the location of the SCR method is also known. The reactant flow requirement has been determined. Here it is a "High dust" location. The reactor is located vertically, the flue gas inlet duct is horizontal. Honey comb type catalysts were specified for the unit.

The basic results of the work are basically two.

The first is the determination of the optimum length of the zone of mixing of the reactant with the flue gas before entering the vertical part of the reactor, The method of reactant supply and the element "static mixer" were designed so that the concentration profile of the reactant already in the horizontal flue gas duct was optimal, The second result is the design of the guiding surfaces in the transition from the horizontal to the vertical part of the reactor and the determination of the minimum distance to the catalytic modules. The result is then the optimum flue gas velocity profile at the inlet to the catalytic layers for a given design of the guidance surfaces. Mathematical modelling, ANSYS CFX software, was used to determine the optimum relevant dimensions.