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Through oil-free operation and the option of water injection, Aerzen VR series screw compressors, with upper gas inlet and lower gas outlet, can be used for gases with varying molecular weights, impurities or a tendency to polymerize and for processes which must not contain oil. The operating limits of the equipment are determined by the pressure and temperature ranges and the permissible speed of the compressor. The compressors are mechanically loaded with pressure differences up to 12 bar (high pressure range up to 25 bar) at maximum discharge temperatures of 250°C (160°C with compressor stages in stainless steel). Single and multi-stage, process gas screw compressor are available with intercooling. The compressor units operate at flow rates from 600 m³/h to 120,000 m³/h with main rotor speeds of 2000 and 20000 1/min. Aerzen oil-free process gas screw compressors have an asymmetrical 4 + 6 - rotor profile (male rotor 4 teeth, female rotor 6 teeth). This profile combination results in a relatively strong rotor core diameter for the allowable pressure drops.International regulatory requirements such as API 619,613,614,671 etc., acid gas regulations (NACE) and customer specifications can be taken into account in the compressor unit. VR series oil-free screw compressors are used in chemical and petrochemical plant, i.e. refineries, in coking plants, soda factories and steel mills for conveying flare gas, coke oven gas, lime kiln gas, mixed gases and gases with hydrogen sulphide concentrations (sour gas). Water injection is carried out in gases for reducing to acceptable operating temperatures to avoid polymerization such as butadiene concentration, which is required for the preparation of styrene-butadiene rubber. The injection of solvents for purification is also possible on a temporary basis. The cleansing effect of injection water and sealing water leakage is regarded as a particular advantage of the VR series oil-free compressor type, wherever deposits of gas impurities, such as tar, naphthalene and traces of polymerised polymer deposit on the rotors and housing walls.
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