How to choose a suitable multi-stage centrifugal blower? - A systematic selection guide
1. Core Four-Step Method for Model Selection
Clarify the requirements of working conditions
Air volume: Calculate the required gas volume based on the process (unit: m³/min). It is recommended to reserve a margin of 10% to 20% to accommodate fluctuations.
Wastewater treatment aeration: estimated based on tank capacity × dissolved oxygen demand × safety factor
Powder conveying: deduce the air volume based on the solid-to-gas ratio (material mass: air volume)
Boosting: Calculate the total resistance of the system (pipeline + elbow + filter + aeration head) to ensure that the fan outlet pressure is greater than or equal to the system resistance
Medium characteristics:
Dusty/corrosive gas → choose 316 stainless steel impeller or fiberglass casing
High-temperature gas (>150℃) → Select heat-resistant material (such as cast steel) + Air-cooled bearing housing
Operation mode: 24-hour continuous operation? Intermittent start-stop? Impact on bearing life and heat dissipation design
Match performance parameters
image.png
Brand and technology route selection
Economical First Choice: Domestic Sabert (12,000 yuan), Best (20,000–150,000 yuan)
Suitable for small and medium-sized wastewater treatment plants, cement plants, and grain conveying
High-performance first choice: Aizhen air suspension fan (50,000 yuan)
Contactless operation, efficiency of 87%, lubrication-free, noise level ≤85 dB, annual electricity saving of 30%+
Imported high-end brands: NOOK from Germany (23,100 yuan), Rolls-Royce from the United States (10,700 yuan)
Suitable for high pressure (>100 kPa), high purity, and harsh chemical environments
Local service and delivery guarantee
Users in Linyi, Shandong Province, are given priority in connection:
Shandong Zhanggu (Zhangqiu Headquarters, with a well-established service network in East China)
Wuxi Shuobo Environmental Protection (Saberto agent, supports fast shipping)
All models on sale support nationwide logistics, and some provide free on-site model selection consultation and debugging services
II. Recommendation Table for Typical Scenario Selection
image.png
Note: The above prices are reference prices for products sold on the Aicaiqiu platform in January 2026, excluding installation and shipping fees.
III. Suggestions on the priority of energy-saving technologies
Variable frequency control: required
Achieve on-demand gas supply to avoid "waste from full operation" and save 15%–30% of energy
Suitable for scenarios with significant air volume fluctuations (such as wastewater treatment and chemical batch production)
Air suspension technology: preferred choice for small and medium-sized users
No bearing friction, no lubricating oil required, lifespan > 10 years
Suitable for users with sufficient budget and a pursuit of low operation and maintenance costs (such as food, pharmaceutical, and environmental protection factories)
Magnetic levitation technology: Recommended for large-scale projects
Higher efficiency (<90%) and higher rotational speed (<75000 rpm)
High cost (<80,000 yuan), suitable for large-scale wastewater plants with a daily treatment capacity of <50,000 tons
IV. Key points of operation and maintenance
Routine inspection: Clean the intake filter monthly to prevent dust blockage from affecting the stability of the gas film (for air suspension models)
Lubrication management: Traditional models require replacement of lithium-based grease every six months, while magnetic suspension/air suspension models do not require lubrication
Exception handling: If there is an increase in vibration or a sudden surge in noise, immediately shut down the machine to inspect for impeller fouling or bearing wear
Intelligent monitoring: Prioritize the selection of PLC remote monitoring system to achieve real-time alarms for pressure, temperature, and current
V. Conclusion: A one-sentence mnemonic for model selection
"Check the working conditions, calculate the parameters, select the suspension, use variable frequency, and find local solutions."
-- Choose Aizhen for sewage treatment, NOOK for chemical industry, Sabert for small factories, and Air Suspension for long-term operation.
Shandong Ruidian Environmental Protection Technology Co., Ltd. is located in the high-end equipment manufacturing base of Luozhuang District, Linyi City. It is a modern enterprise that has always been dedicated to the research, design, production, and manufacturing of multi-stage centrifugal blowers, centrifugal vacuum pumps, Roots blowers, pneumatic conveying systems, and specialized equipment for soil remediation integration
