| 摘要 |
<p>PURPOSE:To disperse an exhaust mixed gas to be circulated as a passivator to a high-pressure system and to be reused into carbon dioxide uniformly and to feed it to the high-pressure system without requiring an exclusive compressor for a combustible gas, by compressing the exhaust mixed gas and a raw material of carbon dioxide, raising the pressure. CONSTITUTION:The carbon dioxide 3 containing oxygen or air as a passivator, the raw material ammonia 4, and the ammonia carbide solution 9 recovered at low pressure are fed to a synthesizing column in the high-pressure system R, synthesized urea solution is sent from the line 8 to a low-pressure decomposition system. An exhaust gas containing oxygen and impurities (e.g., hydrogen, nitrogen, and methane) not condensed in the high-pressure system R is discharged from the line 5. Part of the exhaust gas is sent to the ammonia separator A, carrier ammonia is removed from it, the part of the exhaust gas, the raw material 1 of carbon dioxide and the air 2 as the passivator are sent to the compressor C for carbon dioxide, compressed, and pressure of the gases is raised, and they are sent through the line 3 to the high-pressure system R.</p> |
