Coal Surface Tension Estimation via Vitrinite Reflectance
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Solution Overview
Problem
The existing methods for measuring the surface tension of coal, such as the film flotation method, are time-consuming and require skilled personnel, making it difficult to efficiently estimate the surface tension of coal, which is crucial for producing high-strength coke for blast furnaces.
Innovation Solution
A method that estimates the surface tension of coal inert material by determining relational expressions between surface tension and physical properties like mean maximum vitrinite reflectance, allowing for the calculation of surface tension without direct measurement, and using these estimates to blend coals for producing high-quality coke.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the film flotation method is used to measure surface tension of coal, then the surface tension distribution can be evaluated, but the measurement takes about one day and requires skilled personnel
Solution Approach 1:
The patent changes the measurement parameter from direct surface tension measurement to measuring coal rank parameters (vitrinite reflectance, inert content) that correlate with surface tension. This allows estimation of surface tension through established relationships rather than direct measurement, reducing time from one day to much shorter duration while maintaining evaluation accuracy
Solution Approach 2:
The patent introduces intermediate parameters (vitrinite reflectance Ro, inert content TI) as mediators between the coal sample and surface tension value. These intermediates are easier and faster to measure than direct surface tension, yet provide accurate estimation through predetermined relational expressions
2Measurement precision
If the film flotation method is used to measure surface tension of coal, then the surface tension distribution can be evaluated, but the process is complicated and only skilled measurers can stably measure
Solution Approach 1:
The patent transforms the complex surface tension measurement into simpler measurements of coal rank parameters (vitrinite reflectance, inert content) that have standardized measurement procedures. This reduces process complexity while maintaining the ability to evaluate surface tension accurately through predetermined relationships
Solution Approach 2:
The patent creates a simplified model that copies the essential information from complex surface tension measurements. By establishing predetermined relational expressions between easy-to-measure parameters and surface tension, it creates a surrogate measurement system that replicates the accuracy without the complexity
3Measurement precision
If direct measurement of surface tension is performed, then accurate surface tension values are obtained, but it is difficult to efficiently estimate surface tension for coal blending optimization
Solution Approach 1:
The patent changes from direct surface tension measurement to measuring correlated parameters (vitrinite reflectance, inert content) that can be obtained more efficiently. This enables rapid estimation suitable for coal blending optimization while maintaining accuracy through established relational expressions
Solution Approach 2:
The patent performs preliminary work by establishing predetermined relational expressions between coal rank parameters and surface tension before actual estimation is needed. This preparation enables rapid estimation without repeating complex measurements, improving productivity for coal blending decisions
Data Source
AI summary
A method of estimating a surface tension of coal inert material includes determining in advance a first relational expression representing a relationship between a surface tension of coal inert material and a physical property value representing a coal rank; and measuring the physical property value representing the coal rank of a coal for which the surface tension of coal inert material is to be estimated, and calculating the surface tension of the coal inert material by using the measured physical property value representing the coal rank and the first relational expression.