Cryogenic process refrigeration

Augmenting refrigeration in various cryogenic processes such as the recovery of ethylene... 

For many years, turboexpanders have been used in cryogenic processing plants to provide low-temperature refrigeration. Power recovery has been of secondary importance. Expander efficiency determines the amount of refrigeration produced and, in gas process plants, the amount of product usually depends on the available refrigeration. Accordingly, there is a large premium on efficiency and, of course, on reliability. 

Chapter 9 discusses the refrigeration and cryogenic processes used u-remove specific components from a gas stream, thereby reducing its Btu content. 

Consider a hot process, for example, a reformer. To minimize fuel costs, it is important to minimize heat leaks, cool effluent gases close to ambient temperature, and eliminate losses of high-energy gases. The same is true for cryogenic processes. Fosses in refrigeration normally translate into a process inefficiency. The generation... 

Engine Expansion Cycle. In this process, a refrigerant fluid is compressed, optionally precooled, and expanded to a lower pressure through an expander while producing work to reduce both the enthalpy and temperature of the fluid. The expanded refrigerant fluid is warmed to provide cryogenic refrigeration. 

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