New, oil-free compressor with vertical design saves space and reduces life cycle costs

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Biogas is used for generating electrical energy, for vehicle operation or for feeding into a gas grid. In order to obtain an operational gas, raw biogas is generally compressed and processed in advance. Raw biogas is water saturated and contains a high methane proportion. Therefore the process is complex, because downstream processes, such as membrane upgrading, are extremely sensitive and must not come into contact with oil at any time.  For this reason, Mehrer Compression GmbH has developed a completely oil-free, two-stage compressor: the TRZ 1000, introduced at this year’s EnergyDecentral, is characterized by its lean, vertical design, as well as its multiple use. In addition to raw biogas, it can be used for CO2 and all common process and toxic gases.  

The two-stage, oil-free crosshead piston compressor, which reaches a volume flow of up to 600 Nm³/h, completely waives any oil lubrication during the compression process and is thus perfectly suitable for the energy and environmental industry. In addition to the compression of raw biogas before processing, it is used, for example, for the CO2 recovery during the brewing process or the compression of carbon dioxide during dry ice production. But also toxic and process gases – besides methane and biogas also hydrogen, nitrogen or biomethane – can be compressed with the TRZ 1000. The water-cooled compressor operates at a suction pressure of up to 2.0 bar and a final pressure of up to 26 bar.

The compressor TRZ 1000 developed by the Mehrer Compression GmbH is characterized by an absolutely oil-free compression, as well as its space-saving, vertical construction. Source: Mehrer Compression GmbH

Vertical construction for more space

"The process gas machine follows a lean, space-saving, vertical design, which means that it requires significantly less space compared to horizontal compressors", Hartwig Alber, Marketing & Business Development at Mehrer Compression, explains. The low overall height and low dynamic mass also ensure an operation with lowest vibrations. All relevant operating parameters of the TRZ 1000 such as temperatures and pressures are displayed on a panel. The machine is suitable for both, belt and direct drive.

Robust construction and low life cycle costs 

The construction of the TRZ 1000, with the main components made of high end ductile iron, ensures that the compressor is extremely robust and durable; the compressor is designed for an operating lifetime of more than 20 years. Thanks to sound know-how and the use of highly wear-resistant materials in the area of the piston and rider rings as well as the optimized gas packing, the service life of the sealing elements is far above the usual maintenance interval of 8000 operating hours. This results in a significant reduction in life cycle costs.

Unplanned production downtimes and the resulting financial losses due to production losses are avoided by simple and regular maintenance.

Thanks to absolutely oil-free compression, the TRZ 1000 provides clean process gas at any time – a contamination of downstream systems are generally impossible. This eliminates the need for expensive cleaning processes, which are associated with high time requirement and costs.

The scope of supply ranges from single compressor blocks to complete compressor systems, which are adapted individually to customer requirements. In combination with short delivery times, this leads to short project life span when installing new plants.

In addition, Mehrer Compression also offers a worldwide service for all type of systems.

Versatile applications, individual scope of supply

The TRZ 1000 can be acquired in three different scope of supply: as compressor block, which is integrated into the overall system by the packager itself, as lean compressor package including drive, piping and monitoring or as complete compressor plant.

The latter consists of the compressor package including the control system and can be provided with components such as, for example, a dryer, a water-cooling unit or a sound protection hood.

The scope of supply is optimally adapted to the application case according to the Mehrer’s mission statement "Customized Compression".

In addition to the energy and environmental industry, the TRZ 1000 can also be used in the fields of machine construction, chemistry, petrochemistry, raw materials and food, for example for the CO2 recovery during the brewing process. The exclusive market launch of the compressor took place in November 2016 at the EnergyDecentral in Hanover.