Megammonia®

Pure ATR based ammonia plant with capacity equal to 4000 MTD or more.
Energy consumption achievable about 4.8 Gcal/MT Urea, or up to 6.8 Gcal/MT NH₃.

Megammonia® is the result of the joint co-operation between Casale and Lurghi. The name relates to a single line ammonia process, which is capable of producing up to 1.4 million metric tons/year of ammonia, or more.

The Megammonia® process comprises five principal units:

• Air Separation Unit (ASU)
• Catalytic Partial Oxidation Unit (ATR)
• CO-Shift Unit
• Gas Purification Unit
• Ammonia Synthesis Unit

An ASU produces a gaseous stream of 95% pure oxygen for use in the Autothermal Reformer (ATR), and a stream of 99.99% pure nitrogen for use in the Gas Purification Unit.

A single, axial-radial, HT CO shift converts CO in to CO₂.

The Gas Purification is done in two columns, the first removes CO₂ by absorption in cold methanol - the well known Rectisol® process, proprietary to Lurgi and the second removes the remaining impurities: namely CO, CH₄ and Ar. CO₂ is removed by washing the gas with liquid nitrogen.

The Ammonia synthesis loop is arranged according to Casale standard design. In particular there is a three-bed, two interchanger axial-radial converter directly connected (i.e. nozzle-to-nozzle) to the downstream heat recovery heat exchanger(s).

The direct connection can be made with:

• Steam super heater
• Synloop WHB
• BFW pre-heater

Several dozen ammonia synthesis loops based on this arrangement are currently in operation around the world.

Compared with a conventional steam reformer-based process the Megammonia® process provides several significant benefits for potential owners:

• Lower Investment Required
• Air Separation Unit permits off balance-sheet financing
• Reduced Operating Cost
• Lower environmental emissions
• Increased Urea Production

Megammonia® is a perfect solution for pure ATR based ammonia plant with capacity equal to 4000 MTD or more. The energy consumption achievable is about 4.8 Gcal/MT Urea, or up to 6.8 Gcal/MT NH₃.