What is the difference between 25MPa synthetic ammonia and 31MPa synthetic ammonia?
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Both 25MPa synthetic ammonia and 31MPa synthetic ammonia involve the production of semi-water gas through coal gasification; what are the differences between these two methods?
Within an existing plant, the difference between these two lies merely in the pressure of the ammonia synthesis system; at the two synthesis pressures you mentioned, the pressure in the ammonia synthesis system is lower, and consequently the power consumption of the compressor is also lower； Conversely, the higher the pressure in the ammonia synthesis system, the higher the electricity consumption ； If the ammonia synthesis pressure is too low, the energy consumption for ammonia production is not necessarily the same.
The design for synthetic ammonia at 25 MPa essentially involves using equipment in the synthesis system to reduce pressure, and there is no difference from the standard design for synthetic ammonia at 31 MPa. The power consumption during operation should be low.
The design pressure for the 25 MPa ammonia synthesis plants and the 31 MPa ammonia synthesis plants should be the same, at 31.4 MPa; it is only the operating pressure that differs. At low pressures, power consumption is relatively lower; generally, operating at a pressure of 22 MPa is more economical.
The catalyst loading for 25 MPa synthesis is much higher than that for 31 MPa synthesis.