Capacitive dew point monitoring device and method

Abstract

The invention discloses a capacitive dew point monitoring device and method. The capacitive dew point monitoring device comprises a flue gas filtering module, adew point measuring module and a condensation processing module, wherein the flue gas filtering module is used for filtering impurities in detected flue gas to obtain the filtered detected flue gas; the dew point measuring module is used for measuring a dew point of the filtered measured flue gas; the dew point measurement module comprises a capacitance sensor; and the condensation processing module is used for reducing the temperature of a capacitance plate of a capacitance sensor in the dew point measurement module, so that the filtered measured flue gas forms dew on the capacitance plate. According to the capacitive dew point monitoring device and the method, the sensitivity of dew point measurement can be improved, the dew point measurement error is reduced, and the accuracy of the flue gas dew point measurement result can be improved.

Description

technical field [0001] The invention belongs to the technical field of sensors and measurements, and in particular relates to a capacitive dew point monitoring device and method. Background technique [0002] The exhaust heat loss is one of the largest heat losses of the boiler. In order to improve the thermal efficiency of the boiler, thermal power plants often use the method of reducing the exhaust gas temperature. However, in the process of exhausting smoke, since the fuel of the boiler usually contains elements such as sulfur, nitrogen and carbon, the exhausted flue gas contains SO 2 , SO 3 , NO, NO 2 and CO 2 Under low temperature conditions, the acid gas combines with the water vapor in the flue gas to form the corresponding acid vapor. If the exhaust gas temperature is too low, causing the wall temperature of the metal convective heating surface to be lower than the acid dew point of the flue gas, acid droplets will condense on the surface of the metal heating sur...

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Problems solved by technology

The principle of electrode discharge used in this dew point measurement method is theoretically feasible, but in actual operation, it is uncontrollable whether the electrodes can condense to form acid droplets so that the conduction between the electrodes is uncontrollable, and this method requires high sensitivity of the electrodes. These will affect the accuracy of flue gas dew point measurement results

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