METHOD OF DETERMINING OXIDATION STABILITY OF FUELS UNDER DYNAMIC CONDITIONS Russian patent published in 2004 - IPC

FIELD: petrochemical, aircraft and other industries.

SUBSTANCE: invention relates to laboratory methods of evaluation of operating properties of motor fuels, particularly, their oxidation stability under dynamic conditions. Proposed method of determination of oxidation stability of fuels by deposition formation temperature and amount of deposits on heated indicator tube placed in sealed housing includes pumping of reference and tested fuel along outer surface of indicator tube, measuring brightness signals from outer surface of indicator tube over its length before and after pumping through fuel to be tested, measuring current values of temperature in preset points at subsequent recording of dependences "temperature - tube length", "tube brightness before and after pumping of tested fuel - tube length" basing on which temperature of beginning of deposition is revealed as point corresponding to point of beginning of change of indicator tube surface brightness, and value is calculated proportional to amount of deposits on area limited by lines of dependences of tube brightness before tested fuel pumping through and brightness of tube after pumping through of tested and reference fuels behind the point characterizing temperature of beginning of depositing. Tested fuel is fed square to surface of indicator tube with subsequent changing of direction of fuel movement and stabilization of flow along indicator tube, point of beginning of fuel flow stabilization is recorded and taken as place for mounting first temperature measuring transmitter installed along fuel flow, maximum temperature of indicator tube wall is preset, and time of keeping tested fuel in zone of heating is set. Tested fuel is pumped through at ratio of maximum wall temperature to time of exposure within 0.47-0.87^oC/s, indicator tube wall temperature in preset points is taken as current value of temperature in preset points, and temperature of beginning of deposition is found from design dependence.

EFFECT: improved accuracy and reliability of determination of oxidation stability of fuels, reduced quantity of fuel required for testing.

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