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control KS 98 application Gas burner control with crosswise limitation of the gas and air flows Description To achieve stoichiometric combustion of gas, it is necessary to operate the burner with sufficient excess air. Together with a thorough turbulence of the gas/air mixture, it also ensures a low CO content in the waste gas. For this, the excess air factor "lambda" is usually maintained at 1,2. Moreover, to make certain that sufficient excess air is available under all operating conditions (disturbance of the control valves, pressure drop in the supply, etc.) the air demand is always maximized. One set-value for the air flow controller is provided by the temperature master controller. Another requirement is governed by the instantaneous gas flow. Consequently, the gas flow is reduced automatically in case of a disturbance in the air supply, thus maintaining the necessary lambda value. |
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