Kaeser GBS series rotary screw blowers

Kaeser has launched its GBS series rotary screw blowers for the 75 to 160 kW power range. The blowers feature a flow rate from 22 to 104 m³/min and differential pressures up to 1100 mbar as well as quiet operation, an optimised footprint and low maintenance requirements.

The range is designed to be up to 35% more efficient than conventional rotary lobe blowers and to have energy advantages compared to many other rotary screw blowers and turbo compressors available on the market. Its efficiency has been designed to remain consistent across the control range, rather than just at certain points, which makes the products a viable alternative to turbo compressors.

Power transmission from the motor to the compressor is via loss-free, maintenance-free gearing, which means that the products offer efficient operation and have low maintenance requirements. The products are designed for space-saving installation and quiet operation.

For fixed speed operation, Start Control (STC) versions are available. They feature an integrated star-delta starter equipped with a premium contactor, overcurrent relay and phase monitoring. The STC versions additionally feature an energy-saving IE4 Super Premium Efficiency motor.

Sigma Frequency Control versions are also available and feature an integrated frequency converter for dynamic adjustment of the flow rate to actual demand with the frequency converter and motor matched to deliver consistently optimised overall efficiency. For power outputs up to 110 kW, particularly efficient synchronous reluctance motors are used.

The range features power consumption per unit of flow rate (specific power consumption in kW per m³/h) set according to the narrow tolerances of ISO 1217.

The integrated Sigma Control 2 controller provides operational reliability and smart communication via integration into process control systems, including those with Industry 4.0 requirements. The Sigma Air Manager 4.0 master controller is recommended for blower stations with multiple blowers, as it features control and regulation algorithms specially developed for the needs of low-pressure applications. This enables even greater energy savings and simplification of automation.

The blowers are suitable for applications with especially high energy requirements — such as the production of air for aeration in wastewater treatment facilities and bioreactors, as well as for flotation and fluidisation.