How are the quantity and outlet pressure of the natural gas liquefaction unit and the mixed refrigerant compressor determined?

The determination of the number of mixed-refrigerant compressors and their outlet pressures in a natural gas liquefaction unit is usually based on the following factors: 1. Natural gas liquefaction process: Different liquefaction processes (such as C3MR, AP-X, DMR, etc.) have varying requirements for compressors. 2. Designed capacity: The designed processing capacity of the liquefaction plant determines the number of compressors required and the size of each compressor. 3. Refrigerant circulation requirements: The type and quantity of refrigerant in circulation determine the properties of the fluid compressed by the compressor, affecting the selection of the compressor and the pressure settings. 4. Compressor configuration: Series, parallel, or a combination of both affects the capacity of each individual unit as well as the overall outlet pressure. Calculating the capacity and outlet pressure of a compressor typically requires the application of thermodynamic and fluid dynamics principles, as well as taking into account various parameters such as pressure, temperature, and flow rate under actual operating conditions. Relevant engineering design standards and manuals can be referred to during design, such as the American Petroleum Institute standard API 619 for the design and manufacture of rotary displacement compressors, and the ASHRAE Handbook. Actual design calculations need to be carried out by professional engineers based on specific circumstances. .