Abstract
SNCR (Selective non-catalytic reduction) Technology is currently being used to reach the emission limit for nitrogen oxides at fossil fuel fired power plant and/or heating plant and optimum temperature for SNCR process is in range 850 - 1050°C. Modified SNCR technology is able to reach reduction 60% of nitrogen oxides at temperature up to 1250°C. So the technology can also be installed where the flue gas temperature is too high in combustion chamber. Modified SNCR was tested using generally known SNCR chemistry implemented in CFD (Computation fluid dynamics) code. CFD model was focused on detail simulation of reagent injection and influence of flue gas temperature. Than CFD simulation was compared with operating data of boiler where the modified SNCR technology is installed. By comparing the experiment results with the model, the effect on nitrous oxides removal process and temperature of flue gas at the injection region.
Highlights
The retrofitting of large coal fired boilers with NOX control systems has been concluded in Western Europe many years ago and in Central Europe has been finishing.Starting in the nineties a number of Central and Eastern European countries has joined the EU and as a consequence they had to accept the emission limits which are in force
The paper is focused on the simulation of high temperature modification of SNCR technology which is based on injection of cooling water upstream injection area of reagent
Chemical reactions used to describing of SNCR process are able to predict quite accurately the reduction of NO, but chemistry of SNCR process is strongly simplified due to practical usability and limitation of number of chemical equations included in the CFD model
Summary
The retrofitting of large coal fired boilers with NOX control systems has been concluded in Western Europe many years ago and in Central Europe has been finishing. For the SCR technology, which might be the first choice and it was considered as the best available technology (BAT) in the eighties and nineties, many reliable results and experiences are available to estimate the feasibility as well as investment and operating costs with high accuracy. The SNCR process has been enhanced for smaller boilers like waste incineration plants in last years, and it is widely considered as the ‘Best Available Technology’ (BAT) for this size of boilers Based on this information an increasing number of owners of power plants are seriously investigating today whether the SNCR process is feasible for their large boilers. Special attention is typically being paid to the overall cost compared to SCR
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