Methods for denitration in catalytic devices and control of nitrogen oxides
Thread Content
With stricter environmental regulations regarding the monitoring of nitrogen oxide emissions, I would like to know how various factories reduce the emission of nitrogen oxides from their catalytic devices
If the nitrogen content in the raw materials is not high, the nitrogen oxides in the exhaust gases and wastewater are within acceptable levels
One method is to use denitration agents, which are added directly to the regenerator; another method involves carrying out denitration modifications on the boiler
We are working on desulfurization and denitration, with an emphasis on enhancing denitration
If the nitrogen oxides in the flue gas do not exceed the \"Emission Standards for Pollutants from Petroleum Refining,\" there is no need to consider installing a denitration system. If the level is only slightly above the limit, using denitration additives can be a more convenient, faster, and cost-effective solution; if the excess is significant, it is necessary to consider installing denitration equipment, whether it be SCR, LOTOX, or another type.
For denitration in China, none of the systems can operate without crystallization over the long term – the technology simply isn’t good enough
What the original poster is referring to is probably the denitration of catalytic cracking regeneration flue gas, right? During the regeneration of catalytic cracking catalysts, coking occurs. Due to the high specific surface area of these catalysts, and especially when metal compounds accumulate on them, an excess of oxygen during regeneration, combined with the effect of oxidizing agents, leads to the formation of significant amounts of nitrogen oxides. This is the main reason for the high load in subsequent denitration. During the regeneration process, the amount of excess oxygen must be strictly controlled and should not be too high ； Second, it is necessary to strictly control the amount of oxidizer added. These parameters should be optimized accordingly during the process operation.