Drop Counting via Pressure Pulses in High Temp Reactors
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Solution Overview
Problem
In high temperature decomposition systems for analyzers, existing methods struggle to accurately determine the number of drops of a liquid metered into a reactor, especially when the temperature exceeds the boiling point of the liquid, leading to defective metering due to evaporation and reaction with the carrier gas, which can result in significant deviations in analyte concentration measurements.
Innovation Solution
A method that registers a sequence of pressure signals within the reactor at a sampling rate higher than the drop frequency to detect pressure pulses caused by drops transforming into the gas phase, allowing for accurate determination of the number of drops metered, using a pressure measuring transducer positioned within the gas stream, and adjusts for baseline pressure changes to prevent false counting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical detection methods (light barriers) are used to monitor drops, then drop counting can be achieved, but the device complexity increases and the method becomes difficult to implement in high temperature ranges
Solution Approach 1:
The patent replaces the optical detection system (light barriers, transparent reactor requirements) with a pressure-based detection system. A pressure sensor monitors pressure pulses generated when drops enter the reactor and vaporize, converting an optical measurement problem into a pressure measurement problem that is simpler and more robust for high temperature applications.
Solution Approach 2:
The patent introduces pressure as an intermediary parameter to detect drop entry. Instead of directly observing drops optically, the system detects the pressure disturbance caused by drops entering and vaporizing in the hot carrier gas stream. This intermediary approach simplifies the detection mechanism while maintaining accuracy.
2Productivity
If the reactor temperature is maintained above the boiling point of the liquid for rapid vaporization, then the reaction efficiency improves, but accurate optical detection of drops becomes impossible due to transparency changes and salt deposition
Solution Approach 1:
The patent replaces optical detection (which fails at high temperatures due to quartz glass opacity from salt deposition) with pressure-based detection. The pressure sensor detects pressure pulses generated by drops vaporizing in the hot carrier gas, enabling accurate drop counting while maintaining the high temperature conditions necessary for rapid vaporization and reaction efficiency.
3Device complexity
If a lower sampling rate is used for pressure signal registration, then the system complexity decreases, but pressure pulses from individual drops cannot be captured accurately
Solution Approach 1:
The patent employs dynamic sampling where the sampling rate is adapted to the drop frequency. The system uses a relatively high sampling rate (e.g., 100 Hz or higher) specifically during drop metering intervals to capture individual pressure pulses, then can reduce sampling rate between droplet events. This dynamic approach balances measurement precision with system complexity and energy consumption.
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
This method ensures high accuracy in drop counting, even at high temperatures, by capturing each pressure pulse associated with a drop, thereby minimizing deviations in analyte concentration calculations and ensuring reliable analytical results.
Implementation Method 1
A liquid drop dosed into the reactor transforms into the gas phase, consequently, directly after the dosing, by evaporation and/or by forming gaseous reaction products
Implementation Method 2
a drop metered into the reactor transforms, at least partially, especially completely, into the gas phase following entry into the reactor
Implementation Method 3
with a sampling rate, which is greater than the drop frequency, a sequence of pressure signals dependent on pressure within the reactor is registered
Implementation Method 4
In the reactor, which, for example, is provided by a high temperature reactor formed as a pyrolysis tube, the organic ingredients are thermally decomposed to CO2 and the nitrogen containing ingredients to nitrogen oxide NOx
Implementation Method 5
The temperatures reigning in the high temperature decomposition system lie during operation significantly above the boiling point of the dosed liquid sample
Data Source
AI summary
A method for determining the number of drops metered with a drop frequency into a reactor, especially in a high temperature decomposition system for analyzers, wherein a gas stream is flowing through the reactor. There exists in the reactor a temperature, which is greater than the boiling temperature of the liquid, and a drop metered into the reactor transforms at least partially into the gas phase following entry into the reactor, especially due to heat transfer from contact with a surface within the reactor, especially directly after contact with the surface within the reactor. With a sampling rate, which is greater than the drop frequency, a sequence of pressure signals dependent on pressure within the reactor is registered, and, from the sequence of pressure signals or from values derived therefrom, the number of drops metered into the reactor is ascertained.