the main purpose of the ammonia: mainly for manufacture of urea, ammonium phosphate, melamine, ammonium bicarbonate, ammonium chloride, ammonium sulfate, ammonium nitrate, nitric acid, acrylonitrile and other inorganic and organic chemical products, as well as frozen, plastics, metallurgy, medicine, national defense and other industrial raw materials.
So what’s the industrial process for ammonia?
With the development of large scale ammonia synthesis circle has become one of the main units to reduce the energy consumption of ammonia synthesis.
There are three representative designs of modern large-scale ammonia synthesis devices: 1. Brown’s ammonia synthesis circle with three towers and three waste POTS: Brown’s ammonia synthesis circle with three towers and three waste POTS is composed of three synthesis towers and three waste POTS.
There is a catalyst basket in the tower, and the gas flows from the bottom up through the gap between the shell and the basket body, and then flows through the catalyst bed axially from top to bottom.
The AMOUNT of catalyst in the third column is more than that in the second column, and the ammonia content in the final outlet can be increased from 16.5% to more than 21%, which reduces the circulating gas and saves the circulating compression work.
The control system of the synthetic tower is very simple. Each tower is equipped with a bypass valve to adjust the temperature of the gas entering the tower.
Due to the limitation of ammonia synthesis reaction balance, the catalyst temperature is determined, and there is no need to adjust the catalyst bed reaction temperature.
2. Wood two tower three bed two waste pot ammonia synthesis circle: Wood two tower three bed two waste pot ammonia synthesis circle uses two smaller synthesis tower, three catalyst bed, two towers each connected with a waste pot.
This structure makes the reaction temperature distribution very close to the optimal reaction temperature, the gas circulation volume and pressure drop is small, investment and energy saving, high pressure steam by-production.