Natural Gas Saturator

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Ammonia process

Ours Ammonia plant is designed to produce around 1000 tonnes of ammonia per day by using Natural gas as feedstock and as fuel. Natural gas is first purified in the Desulfuriser. This feed is reformed in Primary Reformer. Natural gas is also supplied to Primary Reformer as fuel besides Associated Gas. A mixture of gases, coming out from Primary Reformer, enters Secondary Reformer where a stoichiometric quantity of air is introduced. The gases leaving the Secondary Reformer contain nitrogen, hydrogen, carbon monoxide and carbon dioxide. These gases pass through Shift Converters where most of the carbon monoxide gets converted to carbon dioxide. This converted gas is purified in a 2 Stage aMDEA CO2 removal system. Activated methyl-diethyl amine (aMDEA) solution absorbs Carbon dioxide in Absorber. The MDEA solution is regenerated in the flash vessel and stripper where CO2 is stripped off and sent to urea plant. Subsequently to the absorption step, the gases are again purified in the Methanator where the remaining small quantities of carbon-monoxide and carbon-dioxide are converted to methane. The synthesis of ammonia demands a high purity of synthesis gas containing only hydrogen and nitrogen in a proportion of 3:1 by volume. After the methanation stage, the synthesis gas is cooled down and sent to synthesis gas compressor. The final stage discharge of synthesis gas compressor is sent to ammonia converters. Here nitrogen and hydrogen combine to form ammonia. The formed ammonia is separated out by condensation in chillers and separators. The gas after removal of ammonia in synthesis loop is recycled back to synthesis gas compressor in last wheel. A small stream of gases being purged from the synthesis loop is sent to the Purge Gas Recovery Plant where hydrogen is recovered by cryogenic process. This hydrogen is returned to the synthesis loop.

The separated liquid ammonia is purified by further flashing and it is then sent to urea plant or to atmospheric storage tanks.

Ammonia process

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