Patent ID: 6872071

Claim:
A device for adjusting the oxidation agent/fuel mixture in the feeding pipe of a burner, said device comprising: means for changing the composition of the oxidation agent/fuel mixture in the feeding pipe; a measurement device for detecting the condition of one of the fuel or oxidation agent/fuel mixture; a circuit for controlling the means for changing the composition depending on the condition which has been detected by the measurement device; and a controllable pump for adjusting the volumetric flow in the tube; wherein the measurement device is a tube viscosimeter with which the dynamic viscosity can be determined via a relationship between the pressure drop over the tube and the volumetric flow; and said measurement device detects the calorific value or the Wobbe index of at least a portion of the fuel or oxidation agent/fuel mixture by measuring the viscosity of said portion or a function of it before combustion; said measurement device being located upstream, in terms of the direction of flow, of said means for changing the composition, and said circuit provides open-loop control of said means for changing the composition of the oxidation agent/fuel mixture according to the detected viscosity, or said measurement device being located downstream, in terms of the direction of flow, of said means for changing the composition, and said circuit provides closed-loop control of said means for changing the composition of the oxidation agent/fuel mixture.