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Ammonium nitrate in the production process for three pressurized and boiling granulation method without evaporation

Ammonium nitrate in the production process for three pressurized and boiling granulation method without evaporation

 

When the starting material of more than 58% concentration of nitric acid , and the use of high pressure in the reactor , the concentration of the solution after the reaction has reached a very high level , which can not completely evaporated system using fluidized bed granulation method , in place of tall granulation tower to make the process much simpler .
 
This process is characterized by :
 
1 , and in the process
 
After sufficient pressure gas ammonia and nitric acid in the respective heat exchanger fully preheated , continuously and in a special reactor . Reaction of ammonia gas and nitric acid plus heat released into the preheated raw heat , enough to evaporate all the water with dilute nitric acid into the . The reaction pressurized to prevent evaporation of nitric acid , nitric acid , especially when heated , but also reduces the loss of nitrogen in the gas phase is fixed . Since ammonia gas preheating, and in the process of turbulence increases, while the ammonia gas is heated to the maximum possible temperature 200 ℃, not only improve the concentration of the melt , and made a strong mixing condition of the reaction medium , but also improve the operating system, reduce production losses.
 
Ammonia gas liquid separation of the emulsion formed in the reactor and , in the first 3 to 3.5 kg / 2 cm in from the new separator for , and then under vacuum conditions of 600 mm Hg in a vacuum for the evaporator . Evaporation under pressure steam separated accounts for 90 to 95 % of the total . This higher gas parameters , it is reasonable to recover heat for other aspects . Evaporated in vacuo , water is evaporated from the melt itself to reduce the temperature of the melt , and the concentration can be increased to 99.5% .
 
2 , fluidized granulation method of ammonium nitrate
 
In a fluidized bed of ammonium nitrate melt crystallization and granulated ammonium nitrate , and sulfate . Compared with a granulation of the tower , the device volume by 18 to 25 times the intensity , the product of hard particles , the temperature is low , greatly reducing the caking of the product . However, its power consumption is large.
 
The 95% ammonium nitrate solution through a nozzle in a fluidized bed or the upper side injection , into a certain amount of pressure from the bed drum air , so in the bed into a mist of spray droplets immediately dried crystals of ammonium nitrate into a solid , thereby forming a solid fluidization . As time increases , the particle growth of 2 to 3 mm, the temperature drops , remove the product from the bed position. Into the air within the bed , out of the upper part of the device , dust recovery after discharge .
 
3 , pan granulation method ammonium nitrate
 
The melt of ammonium nitrate in the can through the nozzle exit speed of the tilting disc , mist droplets crystal grains i.e. , the rotation of the disk , the particles also showed motion. After an appropriate time staying materials , particle growing up, and then continuously discharged 2 to 4 mm as a finished product . Ventilation and cooling crystallization can strengthen the process if necessary.
 
Particle size on the speed of the disk , increasing the speed of particles smaller ; plate tilt angle decreases , the particles residence time in the tray , the particles increases. Can be adjusted according to product requirements.

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