Effect of Natural Gas Composition, Ratio of Methane-Steam and Methane-Air on Ammonia Products

Abstract:

Natural gas has diverse content such as Methane, Ethane, Carbon dioxide, Hydrogen Sulfide, and other gases. In addition, natural gas is formed over a very long time, where it comes from fossil fuels. Natural gas that has been treated and produced products are called synthesis gas which can be used to make ammonia (NH₃). To produce ammonia, steam compounds (H₂O) are used which are reacted with natural gas to produce hydrogen (H₂) and Nitrogen (N₂) obtained from the air. Ammonia manufacturing can be done by several processes, namely desulfurization (natural gas purification), Steam Reforming, Shift Converter, CO₂ removal, methanation, and refrigeration units. The data used in this simulation is data on the ammonia plant at PT. Petrokimia Gresik. What is seen from this simulation is the influence of the composition of natural gas with variations in composition, namely 75% – 99% methane. The largest yield was obtained in the composition of 75% methane with an ammonia product yield of 82.34 tons/hour, this is because the division of the composition is divided propositionally into other compounds such as ethane, and propane, i-butane, etc. which have more H₂ content. Then there is the ratio of methane flow rate to steam using a variation of 1:3.5 - 1:7.5 where the largest ammonia product is obtained from a ratio of 1:7.5 with ammonia product yields of 84.79 tons/hour because more and more steam causes the formation of more hydrogen. Furthermore, there is a ratio of methane flow rate to air with a variation of 1:5.5 - 1:7.5 where the largest ammonia product is obtained from a ratio of 1:5.5 with an ammonia product yield of 84.87 tons/hour because the air content consists of N₂ and O₂, where if the O₂ content is a lot it will react with Methane so that the H₂ produced will be less if methane reacts also with O₂ not only with H₂O.

• Periodical: Advances in Science and Technology (Volume 138)
• Pages: 115-127
• DOI: https://doi.org/10.4028/p-IGn6HB
• Online since: January 2024
• Authors: Regita Febrianti, Sontika Rahma Trianingtias, Vibianti Dwi Pratiwi*, Gelar Panji Gemilar
• Keywords: Ammonia, Hydrogen, Process Simulation, Shift Converter, Steam Reforming

References

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DOI: 10.12962/j23373539.v8i2.47079