Pulse Dampener for Single Piston Pump in Thermal Oxidation Testing
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Solution Overview
Problem
Current methods for testing thermal oxidation stability of fuels, such as the JFTOT procedure, rely on subjective visual evaluation of deposits and are prone to errors due to the use of low-volume, high-pressure single piston pumps, which cause variations in output pressure, and there is a risk of data mismatch between heater tubes and recorded information.
Innovation Solution
An apparatus and method utilizing an intelligent heater tube with embedded memory and a touch-screen interface for objective deposit rating, combined with a low-volume, high-pressure single piston pump dampened by a pulse dampener and coil tubing to maintain consistent output pressure, ensuring accurate and reliable thermal oxidation stability testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a low-volume, high-pressure single piston pump is used, then cost is reduced, but output pressure varies causing measurement errors
Solution Approach 1:
A pulse dampener is introduced as an intermediary component between the single piston pump and the test cell. This pulse dampener absorbs pressure fluctuations and smooths out the pulsating output from the pump, providing consistent pressure to the test cell while allowing the use of a simpler, less expensive single piston pump design
2Device complexity
If visual evaluation by human eye is used, then device complexity is reduced, but measurement precision deteriorates due to subjectivity
Solution Approach 1:
The manual visual evaluation system is replaced with an electronic video-based deposit rating system. A video camera captures images of the heater tube deposits, and image processing algorithms automatically analyze and quantify the deposit amount and characteristics, eliminating human subjectivity while maintaining relatively simple device architecture
Solution Approach 2:
Instead of directly measuring physical deposits on the heater tube, the system creates a visual copy (video image) of the deposits and analyzes this copy. This allows for repeated, consistent measurement of the same deposit pattern without physical contact or disturbance to the original sample
3Device complexity
If data is stored separately from heater tubes, then device complexity is reduced, but information reliability deteriorates due to potential mismatches
Solution Approach 1:
The data storage location is merged with the heater tube itself by embedding memory directly into the heater tube assembly. This ensures that each heater tube carries its own test data, eliminating the risk of data mismatches or loss while maintaining simple overall system architecture
Solution Approach 2:
Each heater tube becomes self-sufficient by containing its own data storage capability. The heater tube with embedded memory serves itself by carrying all necessary test information, eliminating the need for complex external data management systems and ensuring data integrity through physical association
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides objective and accurate measurement of thermal oxidation stability by eliminating subjective evaluation and reducing flow pulsations, ensuring consistent results and preventing data mismatches between heater tubes and recorded information.
Implementation Method 1
a low-volume, high-pressure single piston pump dampened by a pulse dampener and coil tubing to maintain consistent output pressure
Data Source
Figure 1
Figure 2
Figure 2A
AI summary
A thermal oxidation tester is shown for determining thermal stability of a fluid, particularly hydrocarbons when subjected to elevated temperatures. The tendency of the heated fluid to oxidize and (1) form deposits on a surface of a heater tube and (2) form solids therein, are both measured at a given flow rate, temperature and time. The measured results are used to determine whether a fluid sample passes or fails the test. Results of the measurements are recorded. The fluid under test is pumped with a low volume, high pressure, single piston pump with only a small fluctuation (pulsation) in output flow.