How to optimize the energy consumption of multi-stage centrifugal blowers? (2026 Linyi Industrial Energy Conservation Practice Guide)
1、 Four core optimization paths
1. Pneumatic structure optimization: Improving internal efficiency is fundamental
Rear curved blade design: Compared to front curved or radial blades, the rear curved blade shape can reduce vortex loss and improve aerodynamic efficiency by 5-8%
Optimization of snail shell expansion: Adopting a gradually opening type snail shell to smoothly convert kinetic energy into static pressure energy and reduce outlet turbulence
Surface smoothness of the flow channel: using precision casting and polishing technology to reduce boundary layer friction resistance and improve overall efficiency
✅ Engineering verification: After replacing the traditional impeller with a biomimetic streamlined impeller in a cement plant, the shaft power decreased by 12% under the same working conditions, and the annual power savings were about 180000 kWh.
2. Intelligent control upgrade: achieve "on-demand air supply"
Traditional constant speed operation leads to significant energy waste, while intelligent control can accurately match process requirements
|Control technology | Energy saving mechanism | Energy saving range | Applicable scenarios|
|Variable frequency drive (VFD) | Real time speed adjustment based on dissolved oxygen (DO) | 10-20% | Sewage treatment aeration, intermittent pneumatic conveying|
|AI predicted load | Predict daily load curve based on historical data and adjust operation strategy in advance | 8 – 15% | Large municipal sewage plant|
|Digital twin system | Building a virtual model of the fan pipeline network and simulating the optimal operating point | 12-18% | High value production lines and chemical high-pressure systems|
📌 Linyi Empirical Study: After the deployment of AI+VFD system in a sewage treatment plant in Linyi, the energy consumption of the aeration system decreased by 19.7%, and the annual electricity cost was saved by 236000 yuan.
3. Equipment update: Maglev replaces traditional models
Driven by both policy and cost, magnetic levitation centrifugal blowers have become the optimal upgrade path:
|Indicators | Traditional multi-stage centrifugation | Magnetic levitation centrifugation | Advantages|
|Energy Efficiency Level | Level 1 (75-85%) | Mandatory Level 1 (≥ 87%) | Complies with the highest standard of GB/T 28381-2022|
|Mechanical wear and tear | Bearing friction, gear transmission | Non contact, oil-free lubrication | Maintenance free, lifespan>10 years|
|Noise level | 85-95 dB | ≤ 75 dB | Improving the factory environment|
|Annual Energy Saving Potential | Benchmark | 22-30% | 2-3 Year Cost Recovery|
💡 Policy linkage: After Linyi enterprises transform into magnetic levitation fans, they can apply for the "Green Manufacturing Special Fund" of Shandong Province, and the energy-saving part can be converted into carbon emission reduction targets.
4. System level collaborative optimization: from standalone to overall
The optimization of fan energy consumption cannot be carried out in isolation and requires system linkage:
Pipeline network renovation: reducing bends, expanding pipe diameter, eliminating leaks, reducing system resistance by 10-15%, and synchronously reducing fan power
Multi machine parallel scheduling: adopting a "size matching, intelligent start stop" mode to avoid "big horses pulling small cars"
Filter system upgrade: adopting high-efficiency filter elements (such as HEPA) to reduce intake resistance and improve operational efficiency
✅ Case: After the renovation of a factory in Anhui province, Shandong Huadong Motors replaced 2 × 90kW Roots blowers with 70kW maglev fans, resulting in a 23.3% reduction in energy consumption and an annual power savings of 340000 kWh.
2、 Recommended Table for Industrial Scene Optimization in Linyi in 2026
|Application scenarios | Recommended optimization strategies | Expected energy savings | Implementation priorities|
|Municipal sewage treatment plant | Replace with magnetic levitation fan+AI variable frequency control | 25-30%| ⭐⭐⭐⭐⭐|
|Cement plant pneumatic conveying | Traditional fan upgraded to high-efficiency impeller+VFD | 15-20%| ⭐⭐⭐⭐|
|Blast furnace blowing in steel plant | using imported high-pressure models+digital twin monitoring | 10-15%| ⭐⭐⭐|
|Small printing and dyeing/slaughterhouse | Replace with low-noise suspension fan+intelligent start stop | 20-25%| ⭐⭐⭐⭐|
3、 Technological Trends and Policy Support (Linyi, 2026)
National standard: GB/T 28381-2022 specifies that magnetic levitation centrifugal blowers will be included in the mandatory recommended list of "Energy Efficiency Level 1" and inefficient equipment will be phased out
Financial incentive: Shandong Province's "Green Manufacturing Special Fund" provides up to 30% equipment investment subsidy for projects with energy efficiency improvement of ≥ 20%
Operation and maintenance trend: Mainstream manufacturers have provided remote energy efficiency diagnostic platforms that support real-time monitoring of power, efficiency, and vibration, achieving predictive maintenance
📊 Economic comparison (based on 100 m ³/min, 65 kPa operating conditions, and 8000 hours of annual operation):
|Type | Annual electricity consumption (kWh) | Annual electricity cost (0.6 yuan/kWh) | Cost recovery cycle|
|Traditional model | 1314000 | ¥ 788400 | -|
|Maglev model | 950000 | ¥ 570000 | 2.3 years|
|Annual savings of ¥ 218400, with a cumulative power saving of over 1.9 million kWh over 5 years|||
4、 Implementation Roadmap (Operational Steps for Enterprises)
Diagnosis status: Collect current fan operation data (flow rate, pressure, current, power)
Draw performance curve: The manufacturer is required to provide a measured performance curve chart stamped with the official seal (according to GB/T 1236-2017)
Assess the potential for renovation: Compare the current operating point with the high-efficiency zone (80-110% rated flow)
Choose a technical path:
If the device is less than 5 years old: prioritize installing VFD+intelligent control system
If the equipment is over 8 years old: directly replace it with a maglev model
Apply for subsidies: Submit the "Record Form for Energy saving Renovation Projects" to Linyi Municipal Bureau of Industry and Information Technology to apply for green manufacturing funds
Continuous monitoring: Deploy an energy efficiency cloud platform, generate monthly energy-saving reports, and optimize operational strategies
