Activated Coke Desorption Evaluation Using Sulfur Content Baselines
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Solution Overview
Problem
Current methods fail to accurately evaluate the on-site desorption effect of activated coke, which is crucial for the stable operation and recycling efficiency of flue gas desulfurization and denitrification systems, due to the difficulty in measuring fixed sulfur content and calculating desorption rates.
Innovation Solution
A method involving laboratory evaluation of activated coke samples before and after desorption, using a carbon sulfur analyzer to measure sulfur content and a tubular furnace for desorption experiments, calculating a desorption rate (R) based on sulfur content differences, and adjusting process parameters to achieve a desorption rate of ≥90%.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sulfur content is measured to evaluate desorption effect, then desorption evaluation becomes possible, but fixed sulfur cannot be measured accurately leading to inability to calculate desorption rate
Solution Approach 1:
The patent segments sulfur content into two distinct components: decomposable sulfur (S1-S3) and fixed sulfur (S3). By measuring total sulfur before desorption (S1) and after desorption (S2), and conducting a controlled desorption experiment to determine fixed sulfur content (S3), the method enables separate evaluation of desorbed sulfur and remaining fixed sulfur, thus resolving the measurement difficulty
Solution Approach 2:
The patent introduces a controlled desorption experiment as an intermediary process to determine fixed sulfur content. This experiment serves as a mediator that bridges the gap between total sulfur measurement and desorption evaluation, allowing the calculation of desorption rate through the formula (S1-S2)/(S1-S3)×100%
2Reliability
If on-site desorption effect is evaluated directly, then recycling performance can be assessed, but lack of evaluation method leads to unstable flue gas purification process
Solution Approach 1:
The patent establishes a feedback mechanism by calculating desorption rate (R) and comparing it against a threshold value (R≥90%). This feedback system allows operators to assess whether the desorption process is effective and make adjustments to maintain stable flue gas purification performance, thereby resolving the reliability issue
Solution Approach 2:
The patent performs preliminary desorption experiments under controlled conditions to establish the fixed sulfur content (S3) before actual on-site evaluation. This preliminary action creates a baseline reference that enables accurate evaluation of on-site desorption performance, solving the problem of lacking evaluation methods
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 evaluates the on-site desorption effect of activated coke, ensuring its recycling performance meets process requirements and providing guidance for optimization, thereby stabilizing the flue gas purification process.
Implementation Method 1
performing a desorption experiment using the activated-coke sample 1, wherein parameters of the desorption experiment comprise: desorption time being greater than or equal to 40 min, a desorption temperature being 440°C
Implementation Method 2
a nitrogen flow rate being in a range from 40 to 60 L/h
Implementation Method 3
measuring a sulfur content of the powder, which is recorded as S1 in %; measuring a sulfur content of the powder, which is recorded as S2 in %; measuring a sulfur content of the powder, which is defined as a fixed sulfur content and recorded as S3 in %
Data Source
Figure 1~2
AI summary
A method for evaluating an on-site desorption effect of activated coke. An on-site desorption effect of activated coke is evaluated in combination with a laboratory simulation desorption process, an activated-coke desorption rate R is calculated by means of measuring the sulfur content of activated-coke samples before and after on-site desorption and the sulfur content of an activated-coke sample after laboratory simulation desorption, and then the on-site desorption effect of activated coke is evaluated, so as to ensure the recycling effect of activated coke. Therefore, the problem of it being impossible to accurately evaluate the on-site desorption effect of activated coke is solved, and an important guidance is provided for on-site process optimization control.