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Tag: Urea

Nitrogen Industry News Roundup

Spanish fertilizer producer Fertiberia is teaming up with energy firm Iberdrola to build Europe’s largest plant for generating green hydrogen for industrial use – in this case ammonia production. The 100MW solar plant and accompanying 20 MWh lithium-ion battery system and 20MW electrolytic hydrogen production system will be built at a cost of $174 million, and electrolyse water to produce 720 t/a of hydrogen. When fed into Fertiberia’s existing ammonia plant at Puertollano, 250km south of Madrid, the hydrogen will allow a 10% reduction in natural gas use by the plant, saving the company 39,000 t/a in annual CO 2 emissions. Start-up is planned for 2021. Fertiberia will also use electrolysis-generated oxygen as a raw material for nitric acid, which is used to produce ammonium nitrate at the site.

Incident No. 1: Leak in nozzle in urea reactor bottom

High pressure urea equipment often has lined nozzles. A lined nozzle is a full strength carbon steel nozzle that is protected against carbamate corrosion by a 5 or 6 mm thick stainless steel liner plate, which is welded to the carbon steel nozzle on either end. This design is however very vulnerable to fatigue cracking due to the difference in thermal expansion between the austenite liner and the carbon steel nozzle. History shows that such a design will lead to cracking in the long term. The following case study reports on a serious incident in a urea plant where a leak in a urea reactor nozzle caused a plant shutdown but could have resulted in rupture of the high pressure vessel.