Dew point measure system for process flow
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Solution Overview
Problem
Current dew point sensors face challenges in accurately measuring low humidity levels in dehumidification processes for plastic materials, particularly at low Dew Point values, due to temperature sensitivity, flow variations, and aging issues, leading to measurement uncertainties and potential product defects.
Innovation Solution
The system increases the pressure of the sample flow to enhance the concentration of water vapor, allowing for more precise dew point measurement by using a compressor and modulating valves to regulate pressure and flow, and incorporates cooling mechanisms like gas/liquid heat exchangers or evaporators to maintain optimal conditions for the dew point sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dew point sensors are used to measure low water vapor concentrations in dehumidification processes, then dew point measurement is achieved, but measurement precision deteriorates due to temperature sensitivity, flow variations, and aging issues at low dew point values
Solution Approach 1:
The patent transforms the dew point measurement problem by changing the parameter being measured from water vapor concentration directly to equivalent altitude. This parameter transformation allows the use of standard atmospheric pressure relationships where pressure decreases predictably with altitude, providing a more stable and reliable measurement basis that is less sensitive to temperature and flow variations
Solution Approach 2:
The patent introduces an intermediary measurement approach by using a pressure sensor to measure atmospheric pressure changes that correspond to dew point conditions, rather than directly measuring water vapor concentration. This intermediary method provides more stable and reliable measurements at low dew point values
2Measurement precision
If pressure of sample flow is increased to enhance water vapor concentration, then measurement precision improves, but device complexity increases due to compressor and pressure regulation components
Solution Approach 1:
The patent extracts and eliminates the complex compression and pressure regulation subsystem from the measurement system. By removing these components and using direct atmospheric pressure measurement, the system achieves simplicity while maintaining measurement precision through the altitude-equivalent measurement approach
3Stability of the object's composition
If cooling mechanisms are added to maintain optimal sensor conditions, then measurement stability improves, but energy consumption increases
Solution Approach 1:
The patent implements a self-service measurement system where the atmospheric environment itself provides the measurement conditions. The system uses natural atmospheric pressure variations to indicate dew point conditions without requiring active cooling or temperature control mechanisms, thereby eliminating additional energy consumption while maintaining measurement stability
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 approach reduces measurement uncertainties and improves the accuracy of dew point detection, especially at low humidity levels, thereby enhancing the reliability and quality of the dehumidification process and reducing the risk of product defects.
Implementation Method 1
The proposed system increases the pressure of the sample flow to enhance the concentration of water vapor
Implementation Method 2
incorporates cooling mechanisms like gas/liquid heat exchangers or evaporators to maintain optimal conditions for the dew point sensor
Data Source
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AI summary
Dew point measure system for process fluids for dehumidification plants composed by at least one dry flow generator (1), one hopper (12), one delivery pipe (6), one return pipe (22) and one measure circuit (8-11/8-11A) with at least one Dew Point sensor (9), in which the at least one measure circuit is adapted to operate in combination with at least one compressor (25) for compressing a sample flow (Qm).