Compressor in series

The various application fields in Figure 4-12 are served by the machines illustrated in Figure 4-13 ( RZ ) and Figure 4-14 ( R ). R -h R indicates two type-R compressors in series, A -i- R refers to an axial machine followed by a radial compressor, and so forth. 

B7. Bickel, T. C., Himmelblau, D. M and Edgar, T. F., The Optimal Design of a Long Gas Transmission Line with Compressors in Series, presented at the 81st AIChE National Meeting, Kansas City, Missouri, April 12, 1976. 

In the case of nitrous acid plants, application of integrally geared process gas radial turbines and compressors are used in plants with capacities ranging from 120-600 t/day and higher. For air compression, up to three compressor stages are connected in series. To increase efficiency, the inlet temperature of the individual stages is reduced by using two external intermediate coolers. 

Capacity control is more complex in compressor networks where two or more compressors operate in series or parallel. Automatic distribution of the load between compressors is required. The antisurge and load sharing control loops must be coordinated to ensure surge protection while tlie load distribution and energy consumption are optimized. 

Instead of using conventional refrigeration and condensers to convert incoming gas into LNG, the system was designed to feed 2,340 Nm / day (86,800 scfd) into each of two expanders. Both are connected in parallel, with compressors attached at the back end. The compressors are connected in series to boost a single stream of returning gas. 

The power train consists of an HP and LP expander arranged in series that drives the motor/generator, which in this mode is declutched from the compressor train and is connected by clutch to the HP and LP expander train. The HP expander receives air from the cavern that is regeneratively heated in a recuperator utilizing exhaust gas from the LP expander, and then further combusted in combustors before entering the HP expander. The... 

Rotary compressors are frequently arranged as single units with a driver. Occasionally the compressors are also used in series arrangements, with nr without an intercooler. The series configurations may use a form of tandem drive or multiple pinion gears to pennit the use of a common driver. 

The pinion shafts are typically a cantilever-type design that has an enclosed impeller on one end and a tilting-pad bearing on the other. The pinion gear is between these two components. The number of impeller-pinions (i.e. stages) varies with the application and the original equipment vendor. However, all bullgear compressors contain multiple pinions that operate in series. 

Figure 13. Effect of pressure drop and number of reactors in series on theoretical horsepower for hot gas recycle compressor H CO = 3 1, standard ff/day = 250,000,000...

In summary, increasing the number of beds in series for the system shown in Figure 12 decreases the volume of recycle somewhat more than proportionately to the number of beds, decreases the recycle compressor power requirements somewhat, and has no effect on the catalyst volume. On balance, it would appear that the capital savings achieved by increasing the number of beds will be minimal. 

Dr. Moeller I think to answer this question now is a bit difficult. It s just a mechanical problem of the maximum temperature the recycle compressor can handle. So, in the end, we will go to the inlet temperature to the compressor in the range of the inlet temperature to the reactor. So what we are endeavoring to attain is a simple reaction system consisting of an adiabatic reactor in series with waste heat boilers and nothing more than one recycle compressor. These compressors are used in the chemical industry with no problem in operation. So, in the end, you can go to hot recycle with an inlet compressor temperature the same as the inlet reactor temperature. All the heat from... 

How to Specify Centrifugal Compressors, a series of articles in Hydrocarbon Processing, Oct. 1971, p. 64, onward. 

The reactor effluent is cooled and fed to the ethylene separator for recovery of unreacted gaseous ethylene. The liquid phase is filtered to remove small amounts of polymer and then treated with aqueous caustic to remove the catalyst. The dissolved light ends (C2 and C4 olefins) are separated by suitable fractionating towers in series. A portion of the ethylene is purged to remove methane and ethane, and the remaining ethylene is recycled to the compressor. The butene-1 is removed to storage. 

Compressors can be connected in series to increase their discharge pressure (compression ratio) or they can be connected in parallel to increase their flow capacity. When driven by different shafts, they require separate antisurge... 

When two compressors operate in series, one can be dedicated to maintain the total discharge pressure (PIC-01) from the pair, while the speed of the other can be manipulated to keep them at equal distance from their surge curves. This is achieved by FFIC-02 controlling the distribution of the total compression ratio between them. 

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