INVT GD5000 MV VFD for High-temperature Fan Retrofit in 6,500t/d Cement Clinker Production Line

Abstract: Recently, during the retrofitting of a 6,500t/d clinker production line at a major cement group, GD5000-4000KVA Medium-voltage variable frequency drive successfully powered a 2,500kW high-temperature fan, achieving stable commissioning. This marks another significant breakthrough for domestically produced high-end variable frequency drives in applications with industry benchmark clients, establishing their reliable position in critical process operations.

Key Words: GD5000-4000KVA, High-temperature fan, Stable commissioning;

Background

In the production of cement using the new dry process, the high-temperature fan serves not only as the system's power source but also as the central hub for ensuring stable kiln operation and energy-saving control. Its operational reliability directly impacts the continuity and efficiency of the entire production line. Against this backdrop, the client has imposed near-rigorous requirements on the drive equipment—demanding ‘zero unplanned downtime’ throughout an entire maintenance cycle. This represents not merely a technical challenge but a comprehensive test of the product's long-term stability and service capability.

INVT Solution

This high-temperature fan is responsible for extracting waste gases at nearly 400°C, characterized by high temperatures and high dust content, from the entire firing system. Process requirements mandate real-time, precise adjustment of airflow volume based on kiln conditions to stabilize system negative pressure, temperature, and material flow. To meet the project's demands for extreme operating conditions, the INVT GD5000 series medium-voltage VFD was selected. This product, optimized and upgraded from a mature platform, has undergone extensive market validation and offers high reliability.

The solution employs a dual-redundancy design utilizing both Profibus DP communication and hard-wired terminal control. Under normal conditions, comprehensive data monitoring and precise control are achieved via the fieldbus. Should communication fail, the system seamlessly switches to the backup hard-wired control mode, ensuring maximum continuity of operation.

Furthermore, addressing the scenario where the fan is already rotating at low speed due to duct pressure prior to start-up, the variable frequency drive activates its speed tracking restart function. This enables a smooth, low-impact start-up, effectively protecting both the motor and mechanical systems.

Solution Value and Outstanding Performance

1. Significant economic benefits: Initial investment costs reduced by over 40%, shortening the payback period for technological upgrades with immediate economic returns.

2. Precise process control: High-performance spatial voltage vector control technology ensures accurate and rapid airflow regulation, robustly supporting thermal stability within the kiln system while enhancing clinker yield and quality.

3. Ultimate Operational Reliability: Customized thermal management design and redundant critical component configuration, coupled with comprehensive condition monitoring and early warning mechanisms, provide robust assurance for long-term, fault-free equipment operation.

4. Intelligent Management Empowerment: Real-time data transmission to the client management platform establishes a foundational data set for refined energy management, predictive equipment maintenance, and production optimization.

5. High-Efficiency Service Assurance: A nationwide service network ensures clients receive timely, standardized technical support, safeguarding production stability.

Conclusion

The successful application of INVT's GD5000 medium-voltage VFD in the high-temperature fans of a large-scale cement production line fully demonstrates that domestically produced high-end drive products are now fully capable of undertaking the critical task of driving core processes. This achievement transcends mere equipment supply, establishing INVT as a trusted strategic partner capable of creating value for its customers.

This success story not only serves as compelling validation of INVT's product and technological prowess but also actively advances the domestic substitution of critical equipment within the cement industry. It stands as a model of collaborative development and mutual benefit within China's advanced manufacturing sector.

Engineering practice demonstrates that the INVT GD5000 medium-voltage VFD fully meets the stringent demands for high performance and reliability in drive systems for critical high-power loads such as high-temperature fans in the cement industry. It provides a reliable and superior solution for the retrofitting and upgrading of comparable equipment within the sector.