Relationship Between The Minex And The Helium-Driven Modified Coker In The Measurement Of Jet Fuel Thermal Stability

Item

Title
Relationship Between The Minex And The Helium-Driven Modified Coker In The Measurement Of Jet Fuel Thermal Stability
Date
1967
Index Abstract
Not Available
Photo Quality
Undetermined
Report Number
AFAPL TR 67-17
Creator
Lander, Herbert R., Jr.
Zengel, Alan E.
Corporate Author
Air Force Aero Propulsion Lab Wright-Patterson AFB OH
Extent
54
NTRL Accession Number
AD653188
Identifier
AD0653188
Distribution Classification
1
DTIC Record Exists
No
Distribution Change Authority Correspondence
None
Abstract
Six different jet fuels were tested for their resistance to thermal deposition by two versions of the CRC modified coker and the Minex heat exchanger. The test results are compared by plotting the coker deposit code rating versus coker-preheater-tube wall temperature. The temperature of the tube wall, where large quantities of deposits form, is compared with the temperature of the Minex fuel-out, where tube fouling due to deposits occurs. Fouling is indicated by a change in measured heat transfer coefficient. The relative ranking of the six fuels was the same on the Minex as on the helium-driven modified coker. The pump-driven modified coker, however, gave a relative ranking that correlated with neither the Minex nor the gas-driven coker. It was concluded that the pump-driven modified coker was not a satisfactory test tool for fuels with a resistance to thermal degradation above 500F. It was also apparent that the pump on the coker was affecting the test results when fuels of high thermal stability were tested. The most obvious reason for this effect is that the fuels with thermal stability above 500F were treated to remove trace materials, and that these trace materials provide a degree of boundary lubrication. Without this degree of boundary lubrication, the coker pump may wear and release wear products that affect the test results.
Report Availability
Full text available by request
Date Issued
1967-02
Publisher
Wright-Patterson Air Force Base, OH : Air Force Aero Propulsion Laboratory, Research and Technology Division, Air Force Systems Command
Type
report
Provenance
Lockheed Martin Missiles & Fire Control
Format
54 pages ; 28 cm.