Pipe Scale Thickness Estimation Using Outer Heat Flux
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Solution Overview
Problem
Existing methods for estimating scale thickness require acquiring scale growth speed and correlations between parameters, which can be time-consuming and inaccurate due to environmental changes.
Innovation Solution
A scale thickness estimating system that uses easily measurable values such as fluid temperature, flow path outer surface temperature, and heat flux to calculate scale thickness without needing to measure the scale's surface temperature, employing equations derived from heat transfer principles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional scale thickness estimation methods are used (requiring scale growth speed and parameter correlations), then scale thickness can be estimated, but the process becomes time-consuming and accuracy decreases due to environmental changes
Solution Approach 1:
The invention extracts and eliminates the need for acquiring scale growth speed and complex parameter correlations from the estimation process. By using a sensor that directly measures heat transfer characteristics and applies a predetermined calculation formula, the system removes the time-consuming steps of measuring scale growth speed and establishing parameter relationships, while maintaining accurate scale thickness estimation
Solution Approach 2:
The invention performs preliminary preparation by predetermining the calculation formula and thermal conductivity values before actual scale thickness measurement. The sensor system is pre-configured with the relationship between heat transfer characteristics and scale thickness, allowing immediate estimation without needing to establish parameter correlations during operation
2Measurement precision
If scale thickness is estimated using methods requiring scale surface temperature measurement, then theoretical accuracy can be achieved, but practical implementation becomes complex and difficult
Solution Approach 1:
The invention introduces an intermediary approach by using the flow path outer surface temperature as a mediator to indirectly determine scale thickness. Instead of directly measuring the difficult-to-access scale surface temperature, the system measures the outer surface temperature and uses heat transfer principles to calculate scale thickness, making the process practical and easy to implement
Solution Approach 2:
The invention replaces the direct mechanical measurement approach (attempting to measure scale surface temperature) with a thermal field-based calculation approach. By substituting direct temperature measurement with heat transfer analysis using easily measurable parameters, the system achieves both accuracy and ease of operation
3Reliability
If maintenance is performed frequently to remove scale, then scale removal effectiveness is maintained, but flow path downtime increases
Solution Approach 1:
The invention implements a feedback mechanism by continuously monitoring scale thickness and providing real-time information about scale deposition. This allows operators to receive feedback on the actual scale condition and perform maintenance only when necessary, optimizing the balance between scale removal effectiveness and minimizing flow path downtime
Solution Approach 2:
The invention enables dynamic adjustment of maintenance timing based on actual scale thickness measurements. Instead of following a fixed maintenance schedule that causes unnecessary downtime, the system dynamically determines when maintenance is actually needed based on real-time scale deposition monitoring
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
Accurately estimates scale thickness on inner surfaces of flow paths, allowing for timely maintenance and minimizing downtime, applicable to various pipe shapes and materials, and enabling real-time remote monitoring.
Implementation Method 1
a sensor that measures a heat flux on an outer surface of the flow path
Implementation Method 2
employing equations derived from heat transfer principles
Data Source
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AI summary
A scale thickness estimating system 1 according an embodiment includes: a fluid temperature acquiring unit 151 that acquires a temperature "Tf" of a fluid flowing in a pipe 100; a flow path outer surface-temperature acquiring unit 152 that acquires a temperature "To" of an outer surface of the pipe 100; a heat flux acquiring unit 153 that acquires a heat flux "qo" on the outer surface of the pipe 100; a flow path wall-thermal conductivity acquiring unit 154 that acquires a flow path wall thermal conductivity "kw" of the pipe 100; a scale thermal conductivity acquiring unit 155 that acquires a scale thermal conductivity "ks" of scale depositing on an inner surface of the pipe 100; and a scale thickness estimating unit 156 that estimates a thickness of the scale based on the temperature "Tf" of the fluid, the temperature "To" of the outer surface, the heat flux "qo", the flow path wall thermal conductivity "kw", and the scale thermal conductivity "ks".