Lihuang Group checked and analyzed the blockage of RTO system. According to the preliminary discussion, there are a lot of water soluble salts in the plug, among which the proportion of salt at the induced draft fan is relatively high, and the salt at the entrance of the RTO system is relatively low. It may be caused by the entraining of salt in the exhaust gas of the workshop, or the contact between the salt produced by the reaction of acid and alkali exhaust gas and the fan impeller. The reduction of salt at the entrance of the RTO system may be caused by the partial thermal decomposition of salt under the action of hot air, and the obvious increase of salt at the outlet of the RTO system, which should be a new form of salt component formed by cooling after combustion.

Combined with the characteristics that the waste gas components of the RTO incinerator mainly contain hydrochloric acid, methylene chloride and ammonia gas, it is inferred that the blockage materials at the entrance of RTO are mainly ammonium chloride and ferric chloride. After detection, the proportion of components is about 70% for ammonium chloride and 30% for ferric chloride. This also leads to the obvious blockage of the RTO equipment during production, and the corrosion degree of acid gas to the exhaust gas equipment can not be underestimated. Different RTO systems deal with different components of the exhaust gas, the plugging situation, the composition of the plug will change, but you can also roughly judge the components of the plug from the RTO exhaust gas components.

From the analysis of the blockage and its causes, the measures to solve the blockage are mainly to reduce as much as possible the content of particulate matter in the exhaust gas, the concentration of acid and alkali components, the concentration of halogen exhaust gas and the stability of RTO operating temperature, which can be improved from the following three aspects:
(1) Comb the materials in the workshop, further reduce the exhaust gas of ammonia and organic nitrogen into RTO, and further reduce the exhaust gas of acid gas and halogen into RTO. Through the optimization of the production process, the material can be replaced and reduced; The recovery rate of acid and alkali materials was increased through design optimization and upgrading of refrigerant system. It is realized by adding the pretreatment system of acid and alkali waste gas in workshop and optimizing the operation efficiency of exhaust gas treatment system.
(2) Enhance the defogging effect of the tail gas absorption tower before entering RTO to reduce entrainer of water vapor and salt in the waste gas.
(3) The corrosion resistance of the system should be considered in the design of RTO, and excellent pipes and heat storage materials should be selected. Preheating the exhaust gas before entering the RTO reduces moisture corrosion, increases volatilization of some low-melting solids and reduces clogging.