关键词:

小型LNG装置, 撬装, 混合制冷剂, 液化流程, 热力学分析

Abstract:

In this paper, how the key parameters of mixed refrigerant cycle of small scale natural gas liquefaction process in skid-mounted package affect the process performance (including specific power consumption, liquefaction rate, specific refrigerant flowrate and specific cooling water charge) is labored from thermodynamic point of view.These key parameters include temperature of separator S1 and S2, pressure of mixed refrigerant, inlet pressure of natural gas and storage pressure of LNG, components of natural gas and mixed refrigerant.The optimizer of original mode in Aspen HYSYS is used to optimize SP-MRC (mixed refrigerant cycle in skid-mounted package) and find the operating conditions which minimize LNG specific power consumption (objective function).The research reveals that the change of temperature, pressure and component fraction at the same time will influence the process performance remarkably.The new SP-MRC adopts the technology of integral incorporated cascade which combines heavy and light hydrocarbon.It can reduce the quantity and volume of compressors and heat exchangers in the guarantee of higher liquefaction rate and lower specific power consumption.

Key words:

小型LNG装置, 撬装, 混合制冷剂, 液化流程, 热力学分析