[Participate in Activity] Optimal control value for ammonia-salt ratio

By controlling the process parameters. Three key ratios to stabilize production

It is generally kept between 1.00 and 1.12, and in practice this is controlled by regulating the temperature difference before and after ammonia absorption.

It is generally controlled between 1.130 and 1.150

It is generally kept between 1.1 and 1.15.

The original TWO-loop control value was low, with the ammonia mother liquor IIβ value (FNH3/NaCl) maintained between 0.95 and 1.02. Since the overall reaction in the alkali production process is a reversible reaction, increasing the concentration of the reactants (NaCl, NH3, and CO2) can drive the reaction in the direction of the products, thereby facilitating the formation of sodium bicarbonate and ammonium chloride. Therefore, before carbonation of the solution, sodium chloride should be saturated, and the carbon dioxide concentration should be as high as possible (or the carbon dioxide pressure increased). On this basis, the concentration of free ammonia in the solution should also be increased appropriately to maintain a high ammonia-to-salt ratio. However, the concentration of free ammonia cannot be too high either; otherwise, a large amount of ammonium bicarbonate crystals will precipitate during the carbonation process, leading to problems such as blockages in the carbonation tower and increased ammonia loss. In the production of caustic soda, it is required that the ratio of free ammonia to sodium chloride in the caustic solution obtained after carbonation be close to 1 ； At this time, the yield of the unit mother liquor is high, and ammonia loss is low. Practice has shown that in the case of concentrated gas soda production, it is appropriate to keep the β value of ammonia mother liquor II between 0.95 and 1.02. However, the ammonia consumption is actually quite good, yes