The invention discloses an SCR denitration
system ammonia spraying optimization method based on weight valve regulation and control. The method is divided into four steps: measurement of
flue gas flow field characteristics, analysis of
flue gas flow field regional flow characteristics, determination of
ammonia spraying weight valves and pertinence adjustment of opening degrees of the
ammonia spraying valves. The method comprises the particular steps: firstly, measuring the
flue gas flow field characteristics of a flue transverse section in front of an ammonia spraying grille of an SCR denitration
system under a condition of
constant load; then combining with a distribution condition of spray nozzles of the ammonia spraying grille, and analyzing
flue gas flow field regional flow continuous distribution characteristics matched with the ammonia spraying spay
nozzle distribution; according to the
flue gas flow field regional flow characteristics under various load conditions, obtaining the weights of the ammonia spraying valves; and finally, adjusting the opening degrees of all the valves according to the valve
weight difference, simultaneously, with the help of a
flue gas analyzer, measuring the
NOx outlet concentration on an outlet section of the SCR denitration
system, and timely feeding back the adjustment effect of the opening degrees of the ammonia spraying valves. The method can ensure good
ammonia nitrogen mixing equivalent ratio, effectively improves the denitration efficiency, decreases the ammonia escape and reduces the ammonia amount.