小型可移动式天然气液化流程的设计

Design of the small portable natural gas liquefaction process

小型可移动式天然气液化装置是解决常规天然气田中小型气田和非常规天然气田开采问题的有效途径。该文利用HYSYS软件建立了空气膨胀式天然气液化流程,并对流程中各点参数进行了设计,其中针对初压较低的天然气,从天然气高压下小温差换热节能和天然气增压耗功耦合的角度探讨了液化压力大小的设定。结果发现:存在最佳液化压力使流程的比功耗最小,利用冷热复合曲线可以很直观地判定流程的合理性。

Small portable natural gas liquefaction device is an effective way to exploit the small natural gas field and the un- conventional gas field. In this paper, the air expansion natural gas liquefaction process was established by using HYSYS and the parameters were designed in the process. When the initial pressure of natural gas was low, the size setting of the liquefaction pressure was discussed in the view of a coupling phenomenon. Increasing liquefaction pressure could increase power consumption of compressor. The high liquefaction pressure could also reduce specific power consumption because the temperature difference was low. The results show that optimum liquefaction pressure can make the specific power consumption minimum. Furthermore, cold and hot composite curves can judge the rationality of the process intuitively.