LCNG加气站天然气气化过程冷能的收与利用研究.docx

投资成本约在12年内回收。本工艺方案设计简单，占地面积小，运行安全， 投资成本约在12年内回收。本工艺方案设计简单，占地面积小，运行安全， 工艺操作弹性较高，具有很高的实用性。 关键词：LNG冷能回收 丙烷丁烷 朗肯循环发电 万方数据 STUDY STUDY oN THE COLLECTION AND UTILIZATIoN oF CoLD ENERGY IN THE PRoCESS OF NATURAL GAS GASIFICATION oF L．CNG FILLING STATIoN ABSTRACT With the gas vehicle constant promotion and popularization，various regions build a lot of L—CNG refueling stations，but the use of gas station’S cold energy of LNG gasification has not been carried out．The temperature of the LNG is about-1 62．0 degrees Celsius，the cooling energy produced by gasification is about 830-860kJ／kg，which is huge available． This paper first analyzes the advantages and disadvantages of the existing LNG cold energy utilization，in view of the engineering practice of this project, use power generation and cooling system for the combination of the cold energy of the gas station LNG cold energy．In terms of power generation，considering the actual cost of construction and power generation efficiency,this paper adopts low-temperature Organic Rankine cycle power generation and selects refrigerant mixtures in mass ratio 1：1 R290／R600 composition as the Rankine circulation working medium，and chooses 50％of water and ethylene glycol solution with low freezing point as cooling working fluid．In the design of the whole process system，the article has selected the air temperature type gasified as process system gasified，used the U type pipe structure of heat exchanger and adopts the scroll expander．And then the paper use Aspen Plus software to simulate the process of the system，and calculate the exergy efficiency of all the equipment． The exergy efficiency of the LNG heat exchanger is 28．56％，the exergy 万方数据 efficiency efficiency of Rankine cycle heat exchanger is 38．83％，the exergy efficiency of LNG reheater is 40．04％，the exergy efficiency of fan coil is 57．99％．And the exergy efficiency of expansion machine is 70．75％，the exergy efficiency of Rankine cycle refrigerant pump is 95．25％，the exergy efficiency of