Research On Gas-fired Power Plant Flue Gas And LNG Cold Energy Comprehensive Utilization Technology

Liquefied natural gas(LNG)is an important application form in the field of natural gas storage and transportation.It has the advantages of convenient storage and transportation,safety and reliability,and is an important energy source for achieving high quality and diversification of energy supply.Due to the special storage environment of LNG(-162 °C)and the requirement of gas temperature during pipeline transportation,LNG must be gasified before entering longdistance pipeline transportation;the heat loss of large and medium-sized power station is the main source of loss of generator set,from Reasonable and efficient recycling energy considerations,based on the organic Rankine cycle,combined with the industrial natural gas consumption in a certain region,construct a new comprehensive energy utilization system for gas-fired power plant flue gas and LNG cold energy,and carry out the performance of different working fluids in the system.Optimized analysis.In view of the large fluctuation of the gas turbine load in the distributed energy system,the current research on the organic Rankine Cycle(ORC)focuses on the comparison of the thermal performance with the initial parameters under the same endothermic heat,and the gas turbine load is rarely considered.When reduced,the effect of both flue gas temperature and mass flow rate on system performance is reduced.The characteristic model is constructed by HYSYS platform,and the narrow-point temperature difference in the heat exchanger is taken as the constraint condition to study the optimization scheme of the variable working condition ORC working medium.Under the variable load condition of gas-fired power plants,the optimal operating parameters corresponding to the maximum net output of the system are sought.The cycle performance of uncomponentized working fluids is compared from the characteristics of heat rate,mass flow and AP value of heat exchanger.R152 a is found by comparison.The net output power,heat rate and mass flow of the system have obvious advantages compared with the mixed working medium in the selected working condition range,while the condenser AP value and the system heat recovery rate performance are opposite.It provides a reference for the study of the binary nonazeotropic mixture of ORC system.