Operating procedures for ammonia synthesis

1. Main tasks of the position: The main task of this position is to mix the hydrogen and nitrogen gases (makeup gases) supplied by the pressurizer with the recycled gas, and to synthesize ammonia under appropriate temperature, pressure, and in the presence of a catalyst. After cooling and condensation, liquid ammonia is separated and stored in ammonia tanks under reduced pressure. Hydrogen is then recovered from the off-gas using membrane separation, compressed, and reintroduced into the synthesis system to increase ammonia production. Maintain the operating conditions of the synthesis system in accordance with the process specifications; be responsible for starting up, shutting down, performing emergency shutdowns, handling accidents, as well as ensuring normal operation and maintenance of the synthesis system, while keeping accurate original records. Basic principle: The ammonia synthesis reaction takes place at high temperature and pressure in the presence of a catalyst. In the reaction, the hydrogen-nitrogen mixture cannot be completely converted into ammonia. Therefore, after separating ammonia, the unreacted hydrogen-nitrogen mixture must be recycled for further reaction. A large amount of reaction heat is generated during the ammonia synthesis reaction, and a significant amount of cooling energy is required during the separation process. The level of ammonia synthesis efficiency directly affects ammonia production, the consumption of feed gas, as well as the power consumption of compressors and chillers. The chemical equation for ammonia synthesis is: 3H2 + N2 → 2NH3 + Q. This is a reversible reaction with a decrease in volume. The reaction can proceed rapidly only in the presence of a catalyst. The equilibrium ammonia content varies with pressure, temperature, inert gas content, inlet ammonia content, hydrogen-to-nitrogen ratio, and catalyst activity; that is, an increase in pressure, a decrease in temperature, a reduction in inert gas content, and an appropriate hydrogen-to-nitrogen ratio (H2/N2=2.8) contribute to an increase in the equilibrium ammonia content. Here is the link for you; it contains many operating procedures. http://bbs.hcbbs.com/viewthread. ... hlight=%B9%E6%B3%CC

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