CNG站脱水装置节能技术

CNG站脱水装置是CNG加气站的主要耗能单元之一，其脱水效果的好坏直接影响到CNG的气质。针对目前CNG站脱水装置再生工艺不合理、再生时间长、再生能耗高等问题，结合脱水装置实际运行情况，开展了节能技术研究，提出了利用再生气余热的节能技术。其节能核心在于通过能量（热量和冷量）的互补利用，提高加热炉的进口温度以缩短加热时间，降低加热炉电耗量，同时降低冷凝分离器的进口温度以改善CNG的分离效果，实现了CNG站脱水装置节能降耗与优化再生效果的双重目标。在不改变其他设备及参数的条件下，完成了节能技术改造前后能耗对比测试。结果表明：CNG站脱水装置的加热时间缩短了27.3%，再生气用量节约了18.4%，加热炉电耗量降低了28.6%，节能效果明显。

An energy saving technology for a dehydrating device at a CNG station

A dehydrating plant is one of the main power consumption units at a CNG filling station and its dehydrating result will directly influence the CNG quality. In view of the unreasonable regeneration process with time and energy highly consumed in the current dehydrating plant at a CNG station, this paper aims to improve the operation efficiency through performing the studies of energy saving technologies. Thus, an energy saving technology was developed by use of the residual heat of the regenerated gas, the core of which is to utilize energy sources (cold and heat) synthetically and efficiently. The inlet temperature of a heating furnace was raised to shorten the heating time and reduce the electric power consumption. Meanwhile, the inlet temperature of a condensing separator was reduced to improve the separation result. In this way, the dual goals were achieved: energy saving & consumption reducing and the optimized regeneration result for a dehydrating plant at a CNG filling station. Under the condition of the same equipments and parameters, a comparative testing was made before and after the energy saving technology was adopted in a case study. With this energy saving technology, the heating time was shortened by 27.3% , the regenerated gas volume was saved by 18.4%, and the electric power of a heating furnace was reduced by 28.6%.