Fuel Sensor Ignition Delay Measurement
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Solution Overview
Problem
Current methods for determining the cetane number and other physicochemical properties of liquid fuels are slow, costly, and not suitable for real-time analysis, particularly for conventional and non-conventional fuels, leading to inefficiencies in fuel production and engine performance.
Innovation Solution
A compact, portable sensor system with an ignition chamber and fuel dispenser that measures ignition delay to calculate cetane number, carbon content, and carbon-to-hydrogen atomic ratio, operating at ambient pressure and consuming less fuel, allowing for rapid and accurate analysis of various liquid fuels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current methods for determining cetane number are used, then measurement accuracy is maintained, but analysis time is excessively long and real-time analysis is not achieved
Solution Approach 1:
The patent extracts the core measurement function from complex conventional test equipment (such as CFR engines and constant-volume bombs) and implements it in a simplified sensor system. The sensor isolates the essential ignition delay measurement capability from the cumbersome surrounding infrastructure, enabling rapid analysis while maintaining measurement accuracy through focused detection of ignition events.
Solution Approach 2:
The patent replaces complex mechanical test systems (CFR engines, constant-volume bombs requiring high-pressure oxygen systems and precise timing mechanisms) with a simplified sensor-based system that uses electronic detection and control. This substitution eliminates mechanical complexity while preserving the ability to measure ignition delay and determine cetane number accurately.
2Reliability
If conventional test equipment is used, then reliable cetane number measurement is achieved, but device complexity and cost increase significantly
Solution Approach 1:
The patent extracts only the essential measurement function from complex conventional equipment. Instead of using entire CFR engines or constant-volume bomb systems, the invention isolates the core ignition delay measurement capability and implements it in a compact sensor that maintains reliability through focused, simplified detection.
Solution Approach 2:
The patent creates a simplified model or representation of the combustion process that captures the essential ignition characteristics without requiring the full complexity of conventional test equipment. The sensor system replicates the key measurement function (ignition delay detection) in a reduced-form apparatus that is easier to manufacture and operate.
3Productivity
If rapid analysis is implemented, then productivity and real-time capability are improved, but measurement accuracy and reliability may deteriorate
Solution Approach 1:
The patent performs preliminary preparation of the fuel sample and test conditions to enable rapid analysis without sacrificing accuracy. The sensor system pre-establishes optimal measurement conditions (temperature, pressure, oxygen concentration) and uses pre-calibrated detection methods to quickly determine ignition delay and physicochemical properties with maintained precision.
Solution Approach 2:
The patent optimizes measurement parameters (such as chamber temperature, oxygen concentration, and detection sensitivity) to enable faster analysis while preserving accuracy. By adjusting these parameters to optimal values, the system achieves rapid turnover without compromising the precision of cetane number and other property determinations.
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
Enables real-time, accurate determination of physicochemical properties, reducing delays and costs in fuel production, improving engine performance, and distinguishing between conventional and non-conventional fuels.
Implementation Method 1
a heater connected to an exterior wall of the chamber
Implementation Method 2
at least one thermocouple connected to the chamber
Implementation Method 3
a pressure transducer disposed in the inlet line or outlet line
Implementation Method 4
an ignition chamber having a ratio of surface-area-to-volume of greater than 4.7 per inch (1.9/cm)
Data Source
AI summary
A portable, compact, real-time and accurate sensor and method for deriving a physicochemical property of a liquid fuel, such as cetane number, carbon content, carbon/hydrogen (C/H) atomic ratio, or heating value (net heat of combustion). The sensor comprises a constant-volume ignition chamber equipped for measuring ignition delay and magnitude of a peak rise in pressure or temperature following dispensation of a liquid fuel into the chamber. The sensor utilizes air at atmospheric pressure and microliter quantities of fuel. The sensor can be implemented in real-time refinery operations for blending diesel fuels that meet government mandated cetane number standards as well as in applications for standardizing jet, biodiesel, and synthetic fuels, which presently are not classified by any physicochemical property.