Ammonia production via urea hydrolysis; sticking and blockage of ammonia pipeline valves
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This post was last edited by The Great Way has no form_O76t9 on 2022-7-11 17:24. Urea is hydrolyzed to produce ammonia, which is used in SCR denitration systems. The valves in the outlet pipeline of the hydrolyzer (i.e., the product gas pipeline) are prone to sticking and internal leakage, and the waste discharge pipe is blocked by white crystals. The product gas pipeline is designed with steam purging. Solve
Valve sticking and internal leakage are closely related to the material used. The 316L ball valves we use have a PEEK lining, which yields better results
The jamming is likely due to the formation of ammonium carbamate crystals; ensure proper insulation and try rinsing it regularly with hot water
The pipelines should be properly insulated and equipped with temperature monitoring systems; they should be flushed regularly. If ammonia water is used as the flushing fluid, flushing can continue continuously.
Verify the insulation effect of the purge steam and its opening degree