Cement Mill Sulfate Control Using Infrared Blend Monitoring
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Solution Overview
Problem
Cement manufacturing faces challenges in achieving consistent quality and reducing carbon footprint due to variability in raw materials, processing conditions, and sulfate levels, leading to inconsistent cement strength and increased carbon dioxide emissions.
Innovation Solution
Implementing a method and system for monitoring and adjusting sulfate and cement additive levels using infrared sensors to optimize cement strength, incorporating a processor to analyze sensor data and adjust additive amounts and types in real-time, particularly focusing on calcium sulfate forms and environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional cement manufacturing processes are used, then production volume is maintained, but cement strength consistency deteriorates due to variability in raw materials and processing conditions
Solution Approach 1:
The patent implements a feedback control system where sulfate levels in clinker are monitored and used to adjust gypsum addition in the cement mill. This closed-loop approach compensates for variations in raw materials and processing conditions, maintaining consistent cement strength despite fluctuations in the manufacturing process
Solution Approach 2:
The system dynamically adjusts the sulfate content parameter by varying gypsum addition based on measured clinker sulfate levels. This parameter modification allows the cement composition to adapt to changing conditions, ensuring consistent performance
2Strength
If sulfate levels are increased to improve cement strength, then early strength is enhanced, but carbon dioxide emissions increase due to additional gypsum processing
Solution Approach 1:
The system utilizes the sulfate information already present in the clinker (from the kiln process) as a resource. By measuring and leveraging this existing sulfate content, the system determines optimal gypsum addition, avoiding unnecessary sulfate addition and associated CO2 emissions while still achieving target strength
3Manufacturing precision
If extensive process controls are implemented to maintain quality, then cement strength consistency improves, but system complexity and costs increase
Solution Approach 1:
The patent extracts and focuses control efforts on the single most critical parameter—sulfate content—rather than attempting to control all process variables. By measuring sulfate levels in clinker and adjusting gypsum addition accordingly, the system achieves quality consistency through a simplified, targeted approach
4Reliability
If sulfate availability is increased to optimize hydration, then cement performance improves, but energy consumption increases due to additional grinding and processing
Solution Approach 1:
The system applies the principle of partial action by adding only the necessary amount of sulfate (gypsum) required to achieve optimal hydration performance. Rather than consistently adding excessive sulfate to ensure performance, the system calculates and adds precisely the needed amount based on measured clinker sulfate content, reducing unnecessary energy consumption
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
Enhances cement product consistency and reduces carbon footprint by optimizing sulfate and additive levels, ensuring consistent strength and quality while minimizing energy consumption and carbon emissions.
Implementation Method 1
providing at least one sensor system comprising a processor that is communicative with processor-accessible memory, the at least one sensor system comprising an infrared sensor that measures at least one of emanation, reflectance, transmittance, and absorption of energy by or through the ground blend of particles
Data Source
AI summary
The present invention provides a method and system for manufacturing cement wherein ground particles of cement and calcium sulfate are subjected to infrared sensors, laser sensors, or both, so that emanated, irradiated, transmitted, and/or absorbed energy having wavelengths principally within the range of 700 nanometers to 1 millimeter can be monitored and compared to stored data previously obtained from ground cement and sulfate particles and preferably correlated with stored strength, calorimetric, or other data values, such that adjustments can be made to the mill processing conditions, such as the form or amounts of calcium sulfate (e.g., gypsum, plaster, anhydride), or cement additive levels. The strength and other properties of cement can be thus adjusted, and its quality can be more uniform.