In order to develop small-scale natural gas liquefaction equipment, a small expansion natural gas liquefaction process was designed, which was based on the technical parameters of the single screw compressor and expander developed by Beijing University of Technology. The effect of the key parameters on the natural gas liquefaction rate and specific power consumption was simulated and optimized. The results showed that the liquefaction rate of the process can reach 100% and the specific power consumption was relatively low under the optimal operation conditions. These research results can provide theoretical basis for the design of small-scale natural gas liquefaction equipment.

In the text through analyzing the maintenance and support system of surface-to-air missile equipment is given a process model for the corrective maintenance, preventive maintenance. Spare parts supply and support equipment usage. The model can be used for the surface-to-air maintenance and support analysis and has reference to the maintenance and support simulation research for the other equipment with its good universality.