Pressurized Dew Point Measurement for Low-Humidity Process Flow
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current dew point sensors in dehumidification processes for plastic materials face challenges in measuring low water vapor concentrations accurately, leading to uncertainties and potential defects in finished products due to temperature sensitivity, flow variations, and aging issues, especially at low dew point values.
Innovation Solution
The proposed 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 humidity levels in dehumidification processes, then dew point measurement is achieved, but measurement accuracy deteriorates at low Dew Point values due to temperature sensitivity, flow variations, and aging issues
Solution Approach 1:
The patent applies parameter changes by modifying the physical conditions of the sample flow before measurement. Specifically, the sample flow is pressurized to increase water vapor concentration and cooled to optimize sensor operation. These parameter changes (pressure and temperature) transform the measurement conditions to achieve accurate dew point detection at low humidity levels where conventional sensors fail.
Solution Approach 2:
The patent introduces intermediary devices between the process flow and the dew point sensor. A compressor acts as an intermediary to pressurize the sample flow, and a heat exchanger serves as an intermediary to cool it. These intermediaries condition the sample flow to enhance measurement accuracy without requiring the sensor itself to be modified.
2Measurement precision
If pressure of sample flow is increased to enhance water vapor concentration, then measurement accuracy improves, but device complexity increases due to need for compressor and pressure regulation systems
Solution Approach 1:
The sample flow handling system serves multiple functions: it transports the sample from the process, pressurizes it to concentrate water vapor, cools it to optimize sensor operation, and regulates flow rate. By making the sample flow system multi-functional, the patent reduces the need for separate dedicated components for each function, thereby managing complexity while achieving measurement accuracy.
3Reliability
If cooling mechanisms are added to maintain optimal sensor conditions, then measurement reliability improves, but energy consumption increases
Solution Approach 1:
The sample flow system utilizes the compression process itself to generate heat, which is then managed through heat exchange. The system leverages the thermal energy already present in the pressurized sample flow and the ambient environment to achieve cooling, rather than requiring independent high-energy cooling systems. This self-service approach reduces external energy input while maintaining reliable measurement conditions.
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, enhancing the reliability and affordability of the dehumidification process, thereby ensuring higher product quality by increasing the concentration of water vapor and compensating for sensor aging.
Implementation Method 1
The 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
Figure 1
Figure 2~3
Figure 4~5
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).