摘要
简述了国内外对LCNG冷能利用的研究及应用现状,设计了一种LCNG加气站冷热电三联供系统,该系统包括LCNG气化站系统和冷热电三联供系统。LCNG气化站系统包括LNG储罐、抽风机、LNG-冷媒换热器以及CNG压缩机;冷热电三联供系统包括冷媒-制冷剂换热器、冷媒储罐、发电机、废热回收装置、充电桩。LNG通过管道依次连接抽风机、LNG-冷媒换热器、冷媒储罐、冷媒-制冷剂换热器,再通过制冷循环将冷量传递到室内。本系统的有益效果是:LCNG气化站系统耦合冷热电三联供系统,实现能量梯级利用;天然气用于发电,产生的电能供充电桩使用,利用废热回收装置收集发电产生的热量,用于预热燃烧室入口端的天然气,提高发电效率;利用废热回收装置收集的热量加热LNG,使之转变为天然气,替代水浴式加热器的使用,起到节能的效果;本系统可以与传统的石化加油站结合,实现"油气电非"的综合使用。
This paper summarizes the present research and application of the utilization of LCNG cold energy at home and abroad, and the efficiency of traditional LNG gasification station is lower, then designed a system combined cooling, heating and power for LCNG filling station, which consists of LNG gasification station system and combined cooling, heating and power system. The theoretical cooling capacity is calculated,and the advantages of the system are illustrated. LCNG gasification station system includes LNG storage tanks, exhaust fa n ,LNG - refrigerant heat exchanger and CNG compressors. Combined cooling, heating and power system contains refrigerant - refrigerant heat exchanger, refrigerant storage tanks, generator, waste heat recovery unit and charging pile. LNG through the pipeline connect exhaust fan,LNG - refrigerant heat exchanger,refrigerant storage tanks,refrigerant - refrigerant heat exchanger successively. Then through the refrigeration cycle,the cooling capacity is transferred to the room. The system has the advantages that the LCNG gasification station system is coupled with the cooling, heating and power supply system to achieve energy cascade utilization, the LCNG CCHP system to be used in this paper is a kind of efficient energy utilization way. Natural gas is used for power generation, and the generated electric energy is used for the charging pile ; the system enable bring about the cascade utilization of cold, heat and electricity to improve the energy utilization efficiency, realize the recovery of LNG cold energy and avoid the environmental pollution, cold pollution; refrigerant in the LNG - refrigerant heat exchanger heat exchanger improves the refrigeration cycle COP and saves operating costs ; the heat collected by the waste heat recovery unit preheats the natural gas at the inlet end of the combustion chamber to improve the power generation efficiency; the heat collected by the waste heat recovery unit heats the LNG to convert it into natural gas,replacing the use of a water bath heater,which results in saving energy、the system can be combined with the traditional petrochemical gas stations to achieve the comprehensive utilization of uoil, gas, electricity, cooling and heating”. The theoretical calculation shows that the refrigeration capacity provided by the LNG gasification station can be used in seven buildings with area of 30m^2, and the cold energy can be collected, thus reducing the use of high grade energy for cooling. LCNG filling station is suitable for both filling of LNG vehicles,but also suitable for CNG car filling, which is a small investment, low energy consumption, fast filling y independent of pipe network, flexible and convenient multi - function filling stations,which improves the comprehensive utilization of energy, saves energy and promotes the development of natural gas automobile industry. In the process of transformation LNG into normal temperature gas, a large amount of available cold energy is released. Our country is still in the initial stage of its recycling and utilization. In the context of building a harmonious society, LNG recovery enables not only save a lot of energy and create huge economic benefits,but also has an environmental and social benefits of the LNG cold energy recycling feasibility study.
出处
《建筑节能》
CAS
2017年第9期91-95,共5页
BUILDING ENERGY EFFICIENCY
基金
国家自然科学基金青年基金资助项目"渗流射流耦合作用下纤维空调末端气流流动规律与换热机制"(51308077)
关键词
LCNG气化站
冷热电三联供
冷能收集利用
LNG gasification station
combined cooling, heating and power （ CCHP） system
collection and utilization of cold energy
