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They can be either stationary or portable, can be single or multi-staged, and can be driven by electric motors or internal combustion engines. With suitable port connections, the devices may be either a compressor or a vacuum pump. Rotary Vane compressors are, with piston compressors one of the oldest of compressor technologies.
#GAS COMPRESSOR SERIES#
Thus, a series of decreasing volumes is created by the rotating blades. As the rotor turns, blades slide in and out of the slots keeping contact with the outer wall of the housing. The rotor is mounted offset in a larger housing which can be circular or a more complex shape. Rotary vane compressors consist of a rotor with a number of blades inserted in radial slots in the rotor. Rotary vane compressors See also: Rotary vane pump This type is also used for many automobile engine superchargers because it is easily matched to the induction capacity of a piston engine. They are commonly seen with roadside repair crews powering air-tools. Their application can be from 3 hp (2.24 kW) to over 500 hp (375 kW) and from low pressure to very high pressure (>1200 psi or 8.3 MPa). These are usually used for continuous operation in commercial and industrial applications and may be either stationary or portable. We have designed units with 2or 3 or 4 CGC casings and 1 or 2 steam turbine drivers.Rotary screw compressors use two meshed rotating positive-displacement helical screws to force the gas into a smaller space. This will be determined principally by the number of CGC casings and turbine drivers. The capital cost of our CGC compressor / turbine system is directly linked to the equipment capacities and powers. Another key element in the successful CGC is the anti-surge instrumentation. These respective higher / lower operational ratios will be discussed. A related ideal requirement is the turndown flowrate without recycle re-compression. Several plants also request operational capacity margins this directly impacts the CGC design.
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The API design requirement for the CGC sets the respective power margins for both the CGC and its turbine driver. As a consequence, the CGC must be designed not only for its standard API-617 margins, but also for a relatively wide range of feedstock MW and flowrates. Many plants, particularly recent ones, specify a wide range of potential feedstocks in order to optimize periodic feedstock costs and ethylene / propylene ratios. Stage 1 inevitably requires a double suction design. The mega-plant CGC capacities and contaminants impact the optimum fin tip velocities and the number of impellers per each stage. This involves various internal special metallurgies and coatings with regular cleaning injections.
#GAS COMPRESSOR CRACKED#
Hence the suction / discharge pressure ratio is lower and the CGC can often employ only four stages.īut all cracked gas delivered to the CGC often contains a combination of key contaminants, several of which can foul the compressor. Ethane crackers are less demanding feedstock product is ~ 2 molecules per single ethane molecule, and recovery scheme design is easier. This inevitably requires five CGC stages. Naphtha crackers convert the feedstock molecule to ~4 molecular products hence to maximize ethylene production and recovery, the CGC suction pressure must be low (~ 3 psig) and the discharge pressure must be high enough to condense methane (~475 psig). Its energy demand and potential plant run length, linked to its volumetric flow, molecular weight, pressure ratio and associated contaminant removal, is a major design element within the entire ethylene unit.Īs plants become larger, ~1500 KTA ethylene production, various CGC situations are pushed to their limited capacities. The cracked gas compressor (CGC) is still the most critical unit in the entire ethylene production facility.