The Critical Role of Level Measurement in Cement Production
In the cement production process, level measurement is a core link to ensure process stability and equipment safety. Heidelberg Cement AG provides a data foundation for energy optimization by deploying high-precision level instruments to monitor the material positions in silos, tanks, and pipelines in real time.
Accurate level data helps avoid abnormal conditions such as overflow and idling, thereby reducing unnecessary energy consumption. The following video demonstrates Heidelberg Cement's practical cases in level measurement and energy optimization.
Heidelberg Cement's Level Measurement Solution
Selection of Measuring Instruments
According to medium characteristics and working conditions, Heidelberg Cement has selected a variety of level measuring instruments, including radar level gauges, ultrasonic level gauges, and capacitive level switches. These instruments feature high precision, high-temperature resistance, and dust interference resistance, adapting to the harsh environment of cement plants.
- Radar level gauge: suitable for high-temperature, high-pressure, and dusty occasions, with measurement accuracy up to ±2mm.
- Ultrasonic level gauge: used for atmospheric storage tanks, easy to install and low cost.
- Capacitive level switch: used for point-level alarms with high reliability.
Key Points of Installation and Commissioning
Correct installation and commissioning are prerequisites for ensuring level measurement accuracy. Heidelberg Cement follows these steps during implementation:
- Determine the instrument installation position according to the tank structure, avoiding the feed inlet and agitator.
- Ensure a good seal between the instrument flange and the tank connection to prevent leakage.
- Perform empty and full tank calibration, and set the range and alarm thresholds.
- Regularly clean the probe to prevent material buildup from affecting measurement.
Energy Optimization Strategy and Implementation
Energy-Saving Control Based on Level Data
By integrating level measurement data into the DCS system, Heidelberg Cement has achieved linked control of pumps, fans, and compressors. For example, automatically adjusting the feed rate according to the silo level avoids equipment idling or overload, significantly reducing power consumption.
In addition, level data is also used to optimize the load distribution of raw mills and cement mills, enabling the mills to operate under optimal conditions and further saving electrical energy.
Comparison of Key Parameters
The following table compares the energy consumption indicators of some equipment before and after optimization:
| Equipment | Energy Consumption Before Optimization | Energy Consumption After Optimization | Energy Saving Rate |
|---|---|---|---|
| Raw Mill | 28 kWh/t | 25 kWh/t | 10.7% |
| Cement Mill | 32 kWh/t | 29 kWh/t | 9.4% |
| Kiln Tail Fan | 45 kW | 40 kW | 11.1% |
Implementation Results and Summary
Through the level measurement and energy optimization solution, Heidelberg Cement has achieved approximately 10% reduction in energy consumption, while improving the stability and automation level of the production line. This solution not only reduces operating costs but also lowers carbon emissions, in line with the green manufacturing trend.
For engineering technicians and procurement personnel, selecting reliable level instruments and reasonably integrating the control system is the key to replicating this successful experience. It is recommended to conduct a detailed working condition assessment in the early stage of the project and work closely with instrument suppliers to ensure the solution is implemented.