Raw Material Grinding System Selection and Retrofit: A Practical Guide to Increasing Production and Reducing Consumption from 230 TPH to ≥280 TPH Why does a raw material grinding system upgrade require a "comprehensive approach"?

In mining/cement raw material grinding, simply replacing equipment often fails to achieve the desired production increase and consumption reduction targets. To steadily achieve a 230 TPH to ≥280 TPH rate, simultaneous optimization of the entire closed-loop system—roller press, classifier, dust collector, fan, and conveyor—is required. This involves balancing key variables such as electrical drive capacity, circulating air volume/pressure, classification efficiency, system resistance, and material circulation load. Your SAFI raw material roller press system retrofit project achieved a target production capacity of ≥280 TPH by replacing the motor, classifier, cyclone, and circulating fan, and optimizing piping, distribution, and drive, providing valuable insights.

Safi Raw Material Grinding Project0716-gai Case Study: 280 TPH Raw Meal Roller Press System Upgrade (SAFI) Pre-Renovation Challenges: Designed capacity ≥250 TPH, but actual output was approximately 230 TPH, with relatively high energy consumption. Key processes (powder selection, fans, classification, and circulation) faced capacity and efficiency bottlenecks. Core Renovation Measures (Excerpt): Roller Press Drive: Two 1250 kW motors upgraded to 1400 kW; an electric distributor added to the feed end, and the transmission upgraded to increase stable load and throughput potential. V-Type Powder Classifier: Replaced from a VX9620G to a PFV10020, increasing the system's air volume capacity to 500,000–600,000 m³/h to accommodate higher circulation and classification efficiency. Dynamic Classifier: Upgraded from XR3400 (90 kW) to SLR8000 (185 kW), significantly enhancing fineness control capabilities and the upper limit of classification efficiency. Cyclone Separator: Adjusted from 4 x 3550 mm diameter to 2 x 5000 mm diameter, and a new elevated steel platform and supporting air/material ducting were constructed to reduce system pressure drop and improve collection efficiency. Circulating Fan: Upgraded to 580,000 m³/h, approximately 6800–7000 Pa, and 1600 kW, ensuring a stable supply of air volume and pressure to the system from the source. Elevator/Distributor and Hot Air Duct: Transmission components were replaced to increase lifting capacity; the V-type classifier chute was converted to a four-way distributor; and the system's hot air duct was upgraded. Electrical System: Added/replaced inverter cabinets, modified power circuits and cable specifications; upgraded the dynamic classifier from 90 kW to 185 kW; added a medium-voltage inverter to the circulating fan; and added an electric distributor to the roller press. Goal Achieved: Increased system capacity from 230 TPH to ≥280 TPH, laying the foundation for subsequent reductions in specific energy consumption, optimized particle size distribution, and system stability. Key Parameters for Selection and Retrofit: A Directly Comparable List 1) Roller Press and Drive The motor power and torque reserve must cover the target throughput and fluctuations in "hard conditions"; if necessary, upgrade the coupling/torque arm and lubrication and cooling configuration. This project employed a 2×1400 kW upgrade solution. 2) Classification System (V-Type + Dynamic Classifier) The V-Type classifier determines the circulation volume and coarse-fine material separation capability; The dynamic classifier determines the final product fineness and cutting accuracy; The matching of the two requires a design based on the target production capacity and particle size curve. In this case, the PFV10020 and SLR8000 (185 kW) are used. 3) Cyclone Separator and System Resistance The cylinder diameter, cone height, and internal design affect separation efficiency and pressure drop; Replacing 2 x φ5000 mm cyclones and optimizing piping can significantly reduce system resistance and improve the effective utilization of the total air volume. 4) Circulation Fan and Air Network The air volume and pressure must cover the maximum circulation load; A 580,000 m³/h, approximately 6800–7000 Pa, 1600 kW fan is selected, combined with a suitable frequency conversion strategy to achieve both high-load and energy-saving operation. 5) Electrical and Automation The variable frequency drive (VFD) capacity and protection logic must be calculated based on the new operating conditions. The speed curves of the dynamic classifier and circulating fan are key parameters for fineness, output, and energy consumption. This project adds high-voltage and low-voltage variable frequency drive cabinets and multiple power circuits to match the upgraded equipment power. How to determine if your system needs an upgrade? Bottleneck characteristics: unstable feeding, excessive circulating load, fineness fluctuations, high system pressure differential, and increased specific energy consumption. Data indicators: Target production capacity cannot be achieved, classifier current is often at the upper limit, and fan opening/current is consistently high. Retrofit signals: Limited effect after replacing a single unit → Indicates the need for a system-level matching upgrade (simultaneous optimization of air volume, classification, resistance, and conveying). Upgrade Roadmap (Engineering Implementation Recommendations within a 30-Day Window) Process Diagnosis and Scheme Comparison: Confirm target production capacity and product fineness, and complete calculations for the air network and grading system. Equipment and Electrical Selection: Determine roller press drive, V-type/dynamic classifiers, cyclones, circulating fans, and VFDs. Non-standard Equipment and Piping: Optimize the layout of the elevated platform and air/material pipes to reduce resistance and reserve maintenance space. Installation and Parallel Operation: Recommended two-shift/10-hour operation (based on case studies), with demolition/civil construction taking approximately 10 days, and installation and non-standard piping taking approximately 20 days, resulting in a total completion time of 30 days. Joint commissioning and parameter tuning will then be conducted. LVSSN Delivery Capabilities (Excerpt) Equipment Supply: Core equipment such as V-type classifiers, dynamic classifiers, cyclones, and circulating fans will be provided. Power distribution and automatic control systems will be upgraded simultaneously. EPC/EPCM Experience: Covering overseas projects in Turkey, Kenya, Laos, Saudi Arabia, Egypt, and other countries, as well as numerous domestic clinker/grinding technology upgrade cases. Project Schedule and Warranty: A 30-day installation window is used as a guide for project organization; we provide on-shore packaging, installation/commissioning/training, and warranty terms. Frequently Asked Questions (FAQs) Q1: Can replacing only the classifier increase the output from 230 TPH to ≥280 TPH? A: Replacing only the classifier is not recommended. Case studies show that the drive, classifier, air volume, and resistance must be upgraded in tandem to consistently achieve ≥280 TPH. Q2: How can we increase production capacity while maintaining fineness? A: By combining optimization of the dynamic classifier power/speed and the V-type classifier air volume, combined with fine-tuning of the circulating fan frequency converter, we can achieve a dynamic balance between fineness and output. Q3: What is the bottom line for electrical upgrades? A: Ensure the VFD capacity and protection of key equipment are compatible with the new operating conditions. Add or upgrade circuits, frequency converters, and cables for roller presses, fans, and powder separators to avoid limiting process limits due to electronic control limitations. Contact us to learn about your plan for increasing production and reducing energy consumption. Do you need to upgrade your raw material grinding system from bottlenecked production capacity to long-term, stable, high-load operation? 👉 Visit our website and submit your project specifications. Our engineers will provide a customized solution and ROI assessment: LVSSN · Contact & Download