Comparison of energy consumption between air suspension blowers and Roots blowers

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Air suspension blowers originated in South Korea. In recent years, air suspension blowers have quickly entered the market thanks to their eco-friendly, energy-efficient, and low-noise characteristics. Air suspension blowers are products developed from the technology of aircraft turbine engines. Air suspension technology, thanks to its simplicity, stability, maintenance-free operation, and semi-permanence, is currently widely used in the aerospace industry, wastewater treatment, and other industrial fields. Today, let’s compare the performance of air suspension blowers and Roots blowers under the same parameters, to determine which type of blower is more suitable: 1. Parameters required for the blower: Blower airflow volume: Q=200m3/min ； Blower pressure rise: H=80.0kPa ； Number of Roots blowers: 6, with 5 in use and 1 as backup. Air suspension blower capacity per unit: 100 M3/min. Blower pressure rise: H=80.0 kPa ； Number of air suspension blowers: 2 units. II. Energy consumption comparison table. Comparison items: Air volume at 200 M3/min. Number of blowers: 2 air suspension blowers and 5 Roots blowers. Axial power per blower (kW): 135 and 75 respectively. Power of the accompanying motor (kW): 150 and 75 respectively. Power at operating condition (kW): 137 and 75 respectively. Total power consumption (kW): 274 and 375 respectively. Energy savings rate: 36% and 0% respectively. Air volume at 160 M3/min: Number of blowers – 2 air suspension blowers and 4 Roots blowers. Power at operating condition (kW): 219 and 300 respectively. Energy savings rate: 27% and 0% respectively. Note: The comparison of energy consumption between air suspension blowers and Roots blowers shows that the energy savings efficiency is over 27% at the above operating conditions. III. Comparison of daily maintenance costs
Comparison items: Air suspension blower, Roots blower
Blower type: Single-stage centrifugal blower, Roots blower
Wear parts/cycle cost/replacement labor: Air intake filter – reusable, 300/-; Front and rear bearings – every 3 years, 3000/3000; Coupling pins – every 1 year, 300//200; Lubricant – every 1 year, 500/-
Noise level (with sound insulation cover): 80 db(A); 80 db(A), with high system heat generation
Operation monitoring and safety systems: Advanced, making accidents almost impossible; Inadequate, increasing the likelihood of failures
Daily maintenance and repair workload: Very low, though still higher than that of a Roots blower
Remote or automated operation: Easy and precise; Difficult, as the heavy rotors make it hard to control pressure or flow rates
Fan adjustment range: 45–100%, with minimal drop in efficiency; 60–100%, with a efficiency drop of over 5%

IV. Comparison of performance
Comparing the two types of blowers, it can be seen that the air suspension blower has a slightly higher purchase price. However, due to its high efficiency, the electricity savings over two years are sufficient to recoup the initial investment. If calculated over the entire BOT operation period of 20 years, it can save tens of millions in operating costs, resulting in remarkable benefits. Furthermore, air suspension blowers have higher reliability, require no maintenance, and are easier to automate. After saying all this, as for which blower is more suitable, it still depends on one’s own actual circumstances~