US 7,922,481 B2Granted

Method for setting the air ratio on a firing device and a firing device

Assigneeebm-papst Landshut GmbH

InventorsMartin Geiger, Ulrich Geiger, Rudolf Tungl

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Abstract

The temperature generated by a firing apparatus, particularly a gas burner, depends on the mixing ratio between the quantity of air and the quantity of gas fed to the firing apparatus, characterized by the excess air coefficient λ, at a predefined burner load (air mass flow rate) in such a way that the temperature generated by the firing apparatus reaches a maximum when λ=1. According to the inventive method for adjusting the excess air coefficient, said maximum temperature Tmax is determined, whereupon the desired setpoint value λhy of the excess air coefficient is adjusted and the associated setpoint temperature Tsoll is measured. A characteristic curve which represents the correlation between the respective air mass flow rates and the setpoint temperatures at the setpoint value λhy of the excess air coefficient and allows combustion to be regulated to an optimal hygienic state can be determined from said determined correlation between the setpoint temperatures Tsoll at different predefined burner loads. The inventive firing apparatus is adapted to carry out said method and especially comprises a mass flow sensor in the air delivery zone as well as a temperature sensor in the effective range of the burner flame.

Claims18

Dependent claims

A method for setting operating parameters on a firing device, in particular on a gas burner with a fan, an actual temperature produced by the firing device being dependent upon a value of a specific air ratio and having a maximum operating temperature when the value of the specific air ratio equals 1, the method comprising:

controlling a pre-determined air mass flow;
establishing a gas mass flow corresponding to the maximum temperature;
defining a desired value for a hygienic air ratio for a desired hygienic combustion;
controlling the desired hygienic combustion by changing the pre-determined air mass flow by the desired value for the hygienic air ratio for the desired hygienic combustion while maintaining a constant supply of the gas mass flow;
measuring desired temperatures at different air mass flows corresponding to a desired air ratio,
establishing a characteristic line which represents a correlation between the air mass flows and the desired temperatures at the desired air ratio;
regulating the actual temperature to a first desired temperature corresponding to a specific burner load at a first air mass flow using said characteristic line;
and
regulating the actual temperature to a second desired temperature different than the first desired temperature at a second air mass flow different than the first air mass flow using said characteristic line when a load change occurs.

6 more elements

Dependencies are inferred from the claim text.