Synthetic Ammonia Process Technology Exchange Area [Daily Question 2009-03-09]
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Synthetic Ammonia Process Technology Exchange Area [Daily Question 2009-03-09] How to control the crystal growth rate during the carbonization process? This post was last edited by jindin312 on 2009-3-9 10:14.]
1. Control the crystallization temperature. 2. Control the degree of carbonization entering the main tower. 3. Avoid excessive extraction
During the nucleation stage and the initial phase of crystal growth in the carbonization main tower, the temperature should be kept slightly higher, after which it is gradually reduced to continue the carbonization reaction. Lowering the temperature can increase supersaturation, promoting crystal growth. Inside the carbonization tower, driven by the airflow, the solutions in the upper and lower parts of the tower mix thoroughly; fine crystals are carried upward by the airflow, and as they grow larger, they sink to the bottom. The lower temperature in the tower helps to make the crystals larger and more uniform. In terms of operation, the residence time of the crystals within the tower should be increased slightly, and the temperature at the lower part of the tower should be reduced as much as possible, in order to achieve better crystallization and a higher conversion rate!
I heard a presentation before; I remember the two points of controlling the crystallization temperature and avoiding excessive extraction
The key is to control the crystallization temperature of the material and the degree of carbonization of the feed entering the tower. It is also important to pay attention to moderate extraction. Last edited by *aoye613 on 2009-3-9 19:37]
1. Control the temperature of crystallization. 2. Crystal growth is controlled by short-range diffusion across crystal interfaces. 3. Avoid excessive extraction
1. Control the temperature of crystallization. 2. Control the amount entering the main tower. 3. Avoid excessive extraction. The most important factor is still temperature, as it directly affects whether the crystal interface will be damaged.
Control the temperature of crystallization in the carbonization tower; avoid excessive removal of the product (pay attention to the solid-to-liquid ratio of the liquid obtained). Additionally, adjust the inlet air pressure as well as the degree of carbonation and the content of active substances in the ammonia solution fed into the tower in order to control the crystal growth rate.
1. Control the tower temperature appropriately, so that the temperatures at both ends of the curve are slightly lower while the temperature in the middle is slightly higher. 2. The liquid level in the reaction area should be controlled appropriately based on the volume of gas. 3. Control the removal process appropriately based on the volume of gas, striving to ensure a steady removal process so that the crystals can grow properly.
1. Control the temperature of crystallization. 2. Control the amount entering the main tower. 3. Regulate the amount taken out based on the volume of gas, ensuring a steady extraction process to allow the crystals to grow properly
1. Control the temperature of crystallization. 2. Control the degree of carbonization entering the main tower. 3. Avoid excessive extraction:handshake
Control the crystallization temperature, avoid over-extraction when removing it, and also control the carbonization degree of the main tower :)
Control the amount of material entering the main tower, regulate the temperature of the crystallization reaction, and avoid excessive removal.