Method and device for improving the ignition behavior of a premix burner

摘要

The invention relates to a method and a device for the safe ignition of a burner (1) for the combustion of a mixture of air and fuel gas, a fan (3) with a target ignition speed generating an air flow which is passed through a Venturi nozzle (4) the burner (1) is fed, and the air flow upstream of the Venturi nozzle (4) via a fuel gas valve (6) fuel gas is added to a fuel gas inlet (7), with a reference pressure measured value at a measuring point (8) between the fan (3) and the fuel gas inlet ( 7) is passed on with a delay so that the fuel gas valve (6) opens later than the fan (3) delivers enough air for ignition, and the fan (3) starts to ignite at a predetermined speed above the ignition target speed, then the speed is lowered to the ignition target speed, with the actual ignition process being started by triggering ignition sparks at the beginning of the lowering. In the device according to the invention, there is a measuring point (8) for a reference pressure measurement between the fan (3) and the fuel gas inlet (7) and connected to a signal delay device (11), and an ignition control (13) is present which is set up that Starting the blower (3) for ignition at a predefinable speed above a target ignition speed, then reducing the speed to the target ignition speed and starting the actual ignition process by triggering ignition sparks during the lowering. The present invention makes it possible, in conventional systems, to achieve greater reliability during ignition only by changes in the ignition control (13) and by a throttle (10) that is easy to install in the reference pressure line (9).