Oil-free screw compressor for compressing electrolysis H2
The design and water injection of the new compressor stage of the VRW536M (photo) allow the highest differential pressure to date in a single-stage oil-free screw compressor. Compression is based on the principle of oil-flooded screw compressors, except the oil is replaced by water. The water serves both to cool the gas and to seal the internal gaps, enabling compression to higher differential pressures with the highest efficiency. This stage can, thus, replace a two-stage system with classic dry screw compressors, and is even more energy-efficient. The VRW536M is designed for an operating pressure of up to 10.0 bara and a volume flow of up to 6,000 Nm3/h at 50 Hz. Pre-drying of the humid H2 gas is not necessary. Double-acting, water-purged mechanical seals on the conveying chamber ensure 100% oil-free operation. — Aerzener Maschinenfabrik GmbH, Aerzen, Germany