Arrangement and burner automation for adjusting the ratio between supplied amounts of fuel and air in an industrial burner

摘要

An arrangement for adjusting the ratio between supplied amounts of fuel (PA) and air (I) in a burner, which is intended for a gaseous and/or liquid fuel is disclosed. The burner comprises a fuel and air mixing zone, a fuel supply conduit adapted to supply the mixing zone with a given inlet flow of fuel, a combustion air supply means adapted to supply the mixing zone with a given inlet flow of combustion air, and burner automation. The burner automation contains measuring instruments. The burner has its mixing zone accompanied by a combustion chamber which is in communication with a flue gas conduit. The combustion chamber or flue gas conduit has at least one catalytic zone. In the arrangement, the measuring instruments include at least one sensor, such as a lambda sensor, measuring the amount of residual oxygen in flue gases (flue gas oxidation/reduction potential). In the arrangement adjustment for an inlet flow (QI, QItot) of combustion air generated by the combustion air (I) supply means (determined as a volume flow per unit time), as well as the adjustment for an inlet flow (QPA, QPAtot) of fuel arriving in the mixing zone by way of the fuel supply conduit (determined as a volume flow per unit time), by means of burner automation, is based on the amount of residual oxygen measured from flue gases (S) with the measuring instrument, by way of which the burner automation adjusts the relative ratio between said inlet flow (QI, QItot) of combustion air as well as the inlet flow (QPA, QPAtot) of fuel in such a way that the amount of residual oxygen is within the range of 0.05-0.5% in flue gases prior to the catalytic zone.

主权项

1. An arrangement for reducing NOx and CO gases from flue gases of an industrial burner, said arrangement comprising in combination:
an industrial burner adapted to burn gaseous and/or liquid fuel by adjusting the ratio between supplied amounts of fuel (PA) and air (I) in the burner, said burner comprising
a fuel and air mixing zone,a fuel supply conduit adapted to supply the mixing zone with a given inlet flow of fuel,a combustion air supply means adapted to supply the mixing zone with a given inlet flow of combustion air,a burner automation containing measuring instruments including at least one lambda sensor for measuring amount of residual oxygen in flue gases (flue gas oxidation/reduction potential),said burner having the mixing zone accompanied by a combustion chamber which is in communication with measuring instruments of flue gas conduit, said combustion chamber or flue gas conduit being provided with at least one three way catalytic converter with at least two catalytic zones,wherein adjustment for an inlet flow (QI, QItot) of combustion air generated by the combustion air (I) supply means (determined as a volume flow per unit time), as well as the adjustment for an inlet flow (QPA, QPAtot) of fuel arriving in the mixing zone by way of the fuel supply conduit (determined as a volume flow per unit time), by means of burner automation, is based on the amount of residual oxygen measured from flue gases (S) with the measuring instrument, by way of which the burner automation adjusts the relative ratio between said inlet flow (QI, QItot) of combustion air as well as the inlet flow (QPA, QPAtot) of fuel in such a way that the amount of residual oxygen is within the range of 0.01-0.50% preferably within the range of 0.01-0.25% in flue gases prior to the catalytic zone,after the combustion chamber in the flue gas conduit or heat exchange area after combustion chamber, before the first catalytic zone of at least one three-way catalytic converter (s), in the flow direction of flue gases, is located a mixer for acquiring a homogenized flue gas mixture before delivering it to said catalytic converter(s).