NGH Gas Pretreatment Process And Liquefaction Process Simulation

With the progress of combustible ice exploration technology, their proven reserve is growing. Once combustible ice drilling success, how to efficient and safe dispose, storage and transportation produced gas of combustible ice will be the focus of my research work. Our country started late and lack of theory on the pretreatment and storage and transportation process of NGH gas. This article will study in two aspects of pretreatment and liquefaction simulation.First of all, from the pretreatment technology of offshore gas field, specific to the physical and chemical properties of NGH gas, discussed the difference between the NGH gas and conventional gas and deacidification, dehydration process in the pretreatment, designed the treatment plan of NGH gas on the sea. Secondly, in terms of NGH gas storage and transportation, compare the main transportation mode of produced gas, paper offers a new idea that use LNG to transport NGH gas. Analyze the characteristics of various common liquefaction processes and give the design LNG process principle of NGH gas in the sea. Analysis the Thermodynamic of LNG process systematically, determined use SRK equation and PR equation as the basis of phase equilibrium model and combined with LKP equation to calculate the enthalpy and entropy. Simulated calculation of mixed refrigerant LNG process based on HYSYS software, comparing the calculation results such as process flow of refrigerant, compressor power consumption and liquefied rate, simulation and analysis the parameters changes on the influence law of the LNG process. Finally, design a set of LNG process aim at the components of NGH gas, with the minimum power consumption as the objective function, combined with various constraint conditions, simulated and optimized of the MRC process. Post optimality the unit flow energy consumption reduced by 12.02% and liquefied rate increases by 2.69%. Optimization results show that the optimization model establish and the optimization algorithm is feasible, achieved the goal that reduce the power consumption of the total process. The results provide a theoretical support for pretreatment and transportation and storage technology of NGH gas, have important guiding value for field application.