Coke Strength Estimation via Thermogravimetry
Solution Overview
Problem
Existing methods for estimating the coke strength of coal-blend coke after CO2 reaction require extensive time for measuring single-coal cokes and are influenced by factors like residual volatile matter, leading to variations in measurement results.
Innovation Solution
Estimate coke strength using thermogravimetry to measure the TG reactivity index of single-coal cokes, calculate the weighted average for coal-blend coke, and convert it into coke reactivity index (CRI) to determine the coke strength after CO2 reaction (CSR) with the drum index (DI).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the CSR and CRI of single-coal cokes are measured using conventional methods, then the estimation of coke strength after CO2 reaction can be achieved, but the measurement process requires extensive time and preparation of single-coal cokes from all coal brands
Solution Approach 1:
The invention extracts the volatile matter from coke samples before performing CSR and CRI measurements. By removing this variable factor through extraction, the measurement process eliminates the time-consuming step of preparing separate single-coal cokes and reduces variations in measurement results, achieving both accuracy and efficiency
Solution Approach 2:
The invention creates a universal measurement method that can estimate CSR for any coal blend using a single unified procedure. Instead of requiring separate measurements for each single-coal component, the method universally applies to blended coals by measuring CSR on the final blended coke sample, significantly reducing time while maintaining precision
2Measurement precision
If the CSR and CRI measurements are performed on single-coal cokes, then the coke strength after CO2 reaction can be estimated, but the process becomes complex and requires preparation of multiple single-coal coke samples
Solution Approach 1:
The invention extracts volatile matter from the coke samples as a preliminary step before CSR and CRI measurements. This extraction step simplifies the measurement process by removing a source of variation, eliminating the need for complex preparation of multiple single-coal coke samples while maintaining measurement precision
Solution Approach 2:
The invention performs volatile matter extraction as a preliminary action before the actual CSR and CRI measurements. By completing this preparatory step in advance, the measurement process itself becomes simpler and requires fewer steps, reducing overall process complexity while ensuring accurate results
3Measurement precision
If conventional CSR measurement methods are used, then accurate coke strength data can be obtained, but the presence of residual volatile matter causes variations in measurement results
Solution Approach 1:
The invention extracts residual volatile matter from coke samples before performing CSR measurements. By removing this interfering substance through extraction, the measurement results become both more accurate and more consistent, eliminating variations caused by volatile matter content
Solution Approach 2:
The invention performs volatile matter removal as a preliminary treatment step before CSR measurement. This preliminary action ensures that the subsequent measurements are not influenced by volatile matter, thereby improving both the accuracy and reliability of the results
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
Facilitates fast and accurate estimation of coke strength, allowing for stable production and control of coal-blend coke quality, reducing production costs and expanding raw material usage.
Implementation Method 1
measuring a TG reactivity index which is a percentage weight loss measured by thermogravimetry of coke held in a CO2 atmosphere at a predetermined temperature range for a predetermined time
Implementation Method 2
coke strength after CO2 reaction (CSR) which is used as the strength index of the susceptibility of coke to deterioration by hot reaction with CO2 in a blast furnace
Data Source
Figure 1~2
Figure 3~4
AI summary
A method for readily estimating the coke strength of coal-blend coke after CO2 reaction is provided. A coal-blend coke CSR estimating method for estimating the coke strength of coal-blend coke after CO2 reaction (CSR) using a TG reactivity index that is a percentage weight loss measured by thermogravimetry of coke held in a CO2 atmosphere at a predetermined temperature range for a predetermined time, the method including a step of measuring the TG reactivity indices of single-coal cokes and estimating the TG reactivity index of the corresponding coal-blend coke from the weighted average of the TG reactivity indices measured of the single-coal cokes; a step of estimating the coke reactivity index (CRI) of the coal-blend coke from the TG reactivity index of the coal-blend coke estimated in the previous step; and a step of estimating the coke strength of the coal-blend coke after CO2 reaction (CSR) from the coke reactivity index (CRI) of the coal-blend coke estimated in the previous step and the drum index (DI) of the coal-blend coke.