Synthetic Gas/Coke Oven Gas Isothermal Methanation Process Technology And Economic Analysis

As a safe,clean and efficient primary energy source,natural gas is increasingly in demand.In order to alleviate the contradiction between natural gas supply and demand in my country and protect the country's energy strategy security,the development of new,efficient and clean natural gas production processes has become the main research topic in my country's energy and environment strategic research directions.Based on an in-depth analysis of China's energy characteristics and the status of coke oven gas methanation to natural gas industry,this paper uses Aspen plus software to carry out S-1 isothermal methanation catalyst,isothermal methanation reactor and isothermal methanation process system Simulation study.Then,the isothermal methanation process system was compared with the existing adiabatic methanation process system in a plant in terms of energy utilization and economic benefits.Finally,economic analysis proves that the isothermal methanation project is feasible.First,we measured the macro-kinetic parameters of the methanation reaction under the action of the S-1 catalyst,and fitted the macro-kinetic equations of the methanation reaction.Then,based on the kinetic model,aspen plus software was used to simulate the methanation reaction of the furnace gas and the isothermal methanation reactor.The product distribution inside the reactor was investigated under different temperatures,pressures and raw material compositions.The volume of the device was estimated.The research shows that the methane generation rate of the isothermal catalyst at the design temperature and pressure is 50.08 mol·kg-1·h-1,which can meet the needs of industrial production.In order to ensure the uniform temperature distribution of the isothermal reactor bed,the catalyst needs to be filled gradiently.At the same time,the volume of the isothermal reactor required for the annual production of 100 million cubic meters of natural gas is about 11m3,which is only 7% of the adiabatic methanation reactor at the same production scale.Based on the plant's existing adiabatic methanation process system and isothermal reactor,we conducted a full process simulation of the adiabaticmethanation process system and the isothermal methanation process system with an annual output of 100 million cubic meters of liquefied natural gas(LNG),and obtained each system Basic data of main logistics.Then,the energy analysis of the two process systems was conducted,and the thermal efficiency and the efficiency of the two process systems were compared.Finally,an economic analysis of the two processes was carried out,examining the investment,cost,and other economic indicators of the two projects.The research shows that the thermal efficiency of the isothermal methanation process system is 91.74%,the project investment is approximately RMB 294,948,100,and the product cost is approximately 2.23yuan/Nm3.These indicators are lower than the adiabatic methanation process system.At the same time,the financial profitability analysis proves that the isothermal The methanation process project is feasible.It shows that under the same production scale,the isothermal methanation process system is better than the adiabatic methanation process system.