High level of urea synthesis solution
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We have encountered several instances where urea synthesis levels remained high, the pressure dropped, the conversion rate decreased, and the stripping tower lost its load. How can we lower the level of the synthesis liquid as quickly as possible?
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When the synthesis tower is filled with liquid, the reason for the drop in high-pressure is (assuming no gas leakage from the stripping tower to the lower pressure stage) that the stripping tower cannot handle the load, resulting in less high-pressure decomposition; consequently, the high-pressure level drops for a short period of time. Possible reasons why the liquid level in the synthesis tower cannot drop: 1. The outlet valve of the synthesis tower fails to operate for an extended period due to sticking; perform on-site calibration and contact the instrumentation team for handling. 2. Poor component quality, excessive ammonia-to-carbon ratio; use a variable-frequency ammonia reduction pump to adjust the components of the system. Precautions during processing: 1. The opening degree of the gas-phase control valve of the high-washing unit should be low. 2. The pressure in the high-pressure drum should be kept lower. 3. Prevent gas leakage to low pressure, thereby avoiding further deterioration of the system components.