In this way, not only the air permeability of the desulfurizer can be improved, but also the phosphorus in the rice husk is not easy to dissociate to form the white phosphorus which is easy to self ignite, thus fundamentally eliminating the cause of self ignition.
In order to remove the total nitrogen completely, denitrification is an important step. The steps to reduce the nitrate nitrogen effectively should be paid more attention. How to reach the standard of TN treatment? There are four kinds of dephosphorizers: calcium salt, iron salt, aluminum salt and magnesium salt.
Although they work in the same way, they also differ in details. Only when we have a clear understanding of the principles, can we choose more targeted dephosphorization agents. Calcium salts commonly used are Ca (OH) 2 and CaCl2. After the calcium salt enters into the water, the calcium ion combines with the phosphate to form the hydroxyapatite Ca5 (OH) (PO4) 3 precipitation. According to the calculation of KSP solubility product formula, when pH = 5 ~ 10, the solubility of hydroxyapatite is small and the precipitation effect is good. It can be seen from the experiment that the phosphorus removal effect of lime is better than that of calcium chloride, but the dosage of lime is very large. The commonly used iron salts are FeSO4 and FeCl3.
In order to reduce the heat release energy of the regeneration reaction of the desulfurizer after the lid is opened, a certain amount of water vapor should be introduced into the desulfurizer before it leaves the tank to form a water protective film on the outer wall of the desulfurizer particles, so as to reduce the regeneration reaction and the heat release of the regeneration reaction.