| 摘要 |
<p>PURPOSE:To restrain the ammonia consumption to the irreducible minimum of demand by providing a multiplier and a devider and receiving a complementary ammonia command from an ammonia basic command. CONSTITUTION:The detected value 16 of exhaust gas flow rate sent from an exhaust gas flow rate meter 15 is multiplied by the detected value 18 of a nitrogen oxide concn. sent from a nitrogen oxide concn. meter 17 in a multiplier 20 to obtain the total amount 19 of nitrogen oxide. In a subtracter 24, the set value 22 of nitrogen oxide concn. in a setting unit 21 is subtracted by the nitrogen oxide concn. detecting value 18 in the inlet side of the denitration apparatus 3 to obtain the concn. value 23 to be denitrated. In the divider 26, the concn. value 23 to be denitrated is divided by the nitrogen oxide concn. detecting value 18 to obtain the denitration rate 25. The total amount 19 of nitrogen oxide is multiplied by the denitration rate 25 in a multiplier 28 to obtain the denitration amount 27. By this method, the ammonia consumption is retrained to the irreducible minimum demand.</p> |
