| 摘要 |
The invention relates to a method for air quantity regulation of a combustion system which is operated with solid fossil fuels, wherein the combustion system has a vertical combustion chamber with at least one powdered coal burner in the lower region of the combustion chamber and with at least one burnout air plane in the upper region of the combustion chamber which is traversed by combustion gases from bottom to top, wherein the method comprises: - supplying a burner air quantity to the powdered coal burner(s) and a burnout air quantity to the burnout air plane(s), wherein the burner air quantity and the burnout air quantity is pilot-controlled as a function of the present firing power, - correcting the pilot-controlled burner air quantity by means of an O<SUB>2</SUB> regulator in the event of the O<SUB>2</SUB> nominal value in the flue gas being exceeded or undershot, - and correcting the burner air quantity which is predetermined by the O<SUB>2</SUB> regulator by means of a NOx regulator which, when a lower NOx nominal value in the flue gas is undershot, increases the burner air quantity to the burner(s) by a partial air quantity ?Air and reduces the burnout air quantity to the burnout air plane(s) by said partial air quantity ?Air and which, when an upper NOx nominal value in the flue gas is exceeded, reduces the burner air quantity to the burner(s) by a partial air quantity ?Air and increases the burnout air quantity to the burnout air plane(s) by said partial air quantity ?Air, or correcting the O<SUB>2</SUB> nominal value of the O<SUB>2</SUB> regulator by means of the NOx regulator which, when a lower NOx nominal value in the flue gas is undershot, raises the O<SUB>2</SUB> nominal value and therefore increases the burner air quantity to the burner(s), and which, when an upper NOx nominal value in the flue gas is exceeded, lowers the O<SUB>2</SUB> nominal value and therefore reduces the burner air quantity to the burner(s), and to an arrangement for air quantity regulation. |
