| 摘要 |
PURPOSE: To improved a waste gas denitrating method by the catalytic reduction with ammonia, to appropriately control the NH3 supply to the waste gas under good responsiveness to the load fluctuation, etc., to enhance denitrating performance and to prevent the leakage of unreacted ammonia. CONSTITUTION: The stoichiometrically necessary quantity Q1 of NH3 is calculated by a computer 15 from the NOX concn., etc., of a waste gas on the inlet side, the excess or deficiency Q21 of NH3 is calculated by a computer 16 from the difference between the desired NOX concn. on the outlet side and the measured NOX concn., both quantities are added to obtain the control signal of an NH3 flow controller 10, and the NH3 supply is controlled. When the supply is controlled by a converted NOX concn. (MAT), the desired MAT on the outlet side and the excess or deficiency Q22 by computers 18 and 19 are obtained and added to the theoretical quantity Q1 , and the NH3 supply is controlled by the sum. The theoretical quantity Q1 is corrected by the correlation analysis of the data stored for a specified period. |
