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No ready-made solutions

Gas compression for the process industry and refrigeration technology
No ready-made solutions

Customised solutions are in considerable demand when it comes to conveying and compressing gases for the process industry and refrigeration technology. “Off-the-peg” is simply not an option. The blowers and compressors described below are offered by Aerzener Maschinenfabrik in response to the most diverse user requirements.

Author Norbert Barlmeyer Technical journalist

Systems for gas compression have to be absolutely reliable and leakproof because the gases concerned are often flammable or toxic. In addition, many users demand conformity with current industry-specific explosion protection regulations. The choice of materials also plays an important role and must be optimally matched to the needs of the application.
Aerzener Maschinenfabrik supplies rotary displacement blowers with oil-free gas compression for the process industry and refrigeration technology as well as screw compressors with oil injection or oil-free compression. These systems are available in several different versions and with different specifications. All the compressors share the same high energy efficiency.
Rotary displacement blowers
The double-leaf, oil-free compression GR series includes process gas compressors for pressure differences up to 1500 mbar and air intake flow rates of 100 to 50,000 m3/h. The systems, which operate on the positive displacement principle, can automatically adapt to changing operating conditions. They are used, for example, for the compression of H2, CO and hydrocarbon mixed gases, steam and specific critical or toxic gases. Depending on the process requirements, Aerzen can utilise different materials such as nodular cast iron, cast steel or cast stainless steel for these oil-free compression systems, including the rotors. The company also develops individual seal variants for the conveying chamber. The oil and conveyor chambers are completely separated here by neutral chambers. Due to their particularly rugged design, the systems are resistant to impurities in the gas or liquid fractions.
For pressure differences up to 1.2 bar (to special order as a single-stage unit up to 1.5 bar or as a two-stage unit up to 3.0 bar), the similarly oil-free GQ series of rotary displacement blowers is available for air intake flow rates from 15,000 to 100,000 m3/h. The GQ series systems also operate on the positive displacement principle and can adapt automatically to changing operating conditions. All GQ systems are relatively resistant to impurities in the gas such as dust, dirt or liquid fractions. Continuous water injection can be employed for cooling the gas and cleaning the conveying chamber.
Screw compressors with oil injection
For many years, Aerzen only developed and manufactured the compressor stages for screw compressors with oil injection, which were then added to functional refrigeration systems and distributed by a third party. Since 2012, a subsidiary specialising in refrigeration systems has taken care of the company’s sales, design, engineering and packaging activities. Aerzen Hungaria KFT in Esztergom, Hungary, operates as a centre of excellence and offers VMY series screw compressors for refrigeration applications worldwide.
Integrated oil separation systems reduce the residual oil content of 1 to 5 mg/m3. VMY series refrigeration systems with oil injection allow the output to be adjusted from 100 to 20 % through integral control of the flow rate for particularly cost effective compression of natural gas, inert gases, ammonia, helium, hydrocarbons, hydrogen chloride, carbon dioxide, gas mixtures and process gases.
Oil injection makes the compressors insensitive to fluctuating gas volumes, temperatures and pressures. Aerzen’s VMY series of screw compressors is used for closed cooling circuits (ammonia, Freon, helium).
VMY screw compressors with oil injection cooling are customised to meet the varying needs of the process industry. They are also used to compress process gases (natural gas, inert gases, hydrocarbons, etc.) in the chemical and petrochemical sectors. Residual levels of 5 to 1 ppm (at the limit of supply) can be achieved through built-in oil separation.
Oil-free screw compressors
Thanks to oil-free operation and the option of water injection, Aerzen’s VR series of screw compressors with an upper gas inlet and lower gas outlet can be used for gases with varying molecular weights, impurities or a tendency to polymerise as well as for strictly oil-free processes. 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 a maximum discharge temperature of 250 °C (160 °C with compressor stages in stainless steel). Single and multi-stage process gas screw compressors are available with intercooling.
The compressor units operate at flow rates from 600 to 120,000 m3/h with main rotor speeds of 2000 and 20,000 rpm. The compressors have an asymmetrical 4+6-rotor profile (male rotor four teeth, female rotor six teeth). This 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 standards) and customer specifications can be taken into account in the compressor unit. VR screw compressors are used in chemical and petrochemical plants for conveying varying gases, which can also contain hydrogen sulphide. Water injection is carried out in gases for cooling to acceptable operating temperatures in order to avoid polymerisation, for example 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 of oil-free compressors wherever deposits of gas impurities, such as tar, naphthalene or traces of polymerised polymer, occur on the rotors and housing walls.
Aerzener Maschinenfabrik
Hall 8.0, Booth D38
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