| China's natural gas consumption has maintained rapid growth from 2005 to 2016.Natural gas is mainly used as industrial fuel,urban gas,power generation and chemical industry.The development of China's natural gas chemical industry was later than abroad,mainly relying on the introduction of technology.At present,natural gas can produce synthetic ammonia,methanol,liquid fuels and other products.The indirect conversion is the main route for the use of natural gas chemical industry.Indirect conversion is the process in which natural gas is first converted into synthesis gas and then the synthesis gas is converted into other chemical products.The indirect conversion of the main products can be divided into three categories:hydrogen and synthetic ammonia,methanol and its derivatives,Fischer-Tropsch synthesis products.The article selected the process of hydrogen,olefins(natural gas through methanol to olefins),and synthetic oils for technical and economic analysis.Technical and economic analysis clarifies the technical characteristics of each technology and selects the best process route.;Cost analysis shows the natural gas costs is a major part of the cost of of natural gas to produce hydrogen,olefins and synthetic oil.The cost increases with the increase of the gas price and the gas price increases by 0.1 yuan/m~3,the unit cost increased by 439 yuan/ton,248.2 yuan/ton,and 224 yuan/ton,respectively.The maximum gas prices that the hydrogen production projects and olefins projects can obtain at least a 10%return on investment are 1.66 yuan/m~3 and 1.87 yuan/m~3respectively.;Sensitivity analysis shows that natural gas price and product price are important factors that affect the economic benefits of the project.For hydrogen projects and olefin projects,the impact of product price on project economic benefits is greater than the impact of gas price;The break-even analysis shows that under the same natural gas price,hydrogen production projects require higher operating rates than olefin projects.The comparative results of the competitiveness of natural gas and alternative raw materials show that the natural gas conversion to syngas,hydrogen production,olefins production,and synthetic oil technology is superior to the coal-based process in many respects.;when the natural gas price is 1.34 yuan/m~3 and raw coal is 205 yuan/ton,the cost competitiveness of natural gas to syngas,olefin and synthetic oil is lower than the process of coal as raw materials.The cost competitiveness of hydrogen production from natural gas is stronger than that from coal;Under the background of crude oil price of51$/barrel,the cost competitiveness of synthetic oil from natural gas projects is much lower than traditional oil refining projects. |
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