| 摘要 |
The invention relates to a method for the complex separation of ammonia and hydrogen from the ammonia synthesis residual gases by means of partial condensation. The object of the invention is to minimise the expenditure of energy for the recompression of the hydrogen to be separated, to separate the liquid fractions (nitrogen, methane, argon, ammonia) with a minimal hydrogen content, and to obtain a maximum of ammonia from the flash gases. The problem is solved in that with a heat exchange of the individual fluids to be effected, the pressure of the let-down circuit gas is reduced in several stages, along with partial condensations, to pressures which are adapted to the suction pressures of the compression stages of the synthesis gas compressor and, in the case of the last flash stage, to the fuel gas system pressure. The problem is furthermore solved in that following an ammonia separation to be effected, the product flash gas I is adapted, with the hydrogen proportion thereof, to the suction pressure of the synthesis gas compressor and, with the liquid proportion thereof, to the fuel gas system pressure. |
