AIR FUEL RATIO CONTROL OF COMBUSTION APPLIANCE BY USING THE GAS SENSOR AND PROCESSING METHOD OF EXHAUST GAS

摘要

The present invention can easily detect the amount of oxygen (O ₂ ) of carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NO _x ) in the gas discharged after the fuel and air are mixed and combusted in the combustion chamber of the combustion apparatus. The voltage signal obtained by installing a semi-conductor type gas sensor in the year is processed by the microcomputer and applied to control the air-fuel ratio of the combustion device, the exhaust gas recirculation function, and the operation temperature of the three-way catalyst. The sensor 3 detects the concentrations of carbon monoxide and hydrocarbons as voltages, respectively, and sends them to the microcomputer, and the oxygen, nitrogen oxide, and temperature sensors simultaneously measure the concentration of oxygen and the temperature of the combustion flue gas as voltages and send them to the microcom. And compare and settle the value. The amount of carbon monoxide and hydrocarbons due to the lack of air combustion is compared with the reference output voltage at the optimum combustion, and the opening and closing angles of the blower 8 or damper 7 of the boiler and the opening time of the injector until the value matches the reference voltage. Air-fuel ratio control method of combustion flue gas measurement-type combustor using multi-gas sensor to optimize air-fuel ratio by adjusting the gas pressure and the output voltage of carbon monoxide or hydrocarbon sensor is zero at the same time. The output voltage of the oxygen and nitrogen oxide sensor is largely negative and it is adjusted to the optimum combustion by controlling the blower, damper or injector until the same as the reference voltage, respectively. If the combustion temperature is higher than 300 ℃ or the oxygen concentration is 4 ~ 10%, it is open if it is over the setting value of Micom (6). The nitrogen recirculation valve 9 is closed to suppress the release of nitric oxide compounds. Also, if the carbon monoxide, hydrocarbon, and nitrogen oxide emissions from the sensors 3 and 5 are excessively discharged above the regulated values, the catalytic purifier 4 A method of treating flue gas of a combustor using a composite gas sensor to control the temperature of the gas as high as possible to discharge harmful gases low.