Research on the issue of retrofitting boilers with low-nitrogen burners

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Currently, there are many methods for controlling NOx in the entire environmental protection industry, such as SNCR, SCR, oxidation methods, and so on. These are all post-furnace controls. Low-nitrogen combustion modification can be considered as a method for controlling NOx at the furnace front. That brings us to the problem; I kindly ask the experts and engineers to share their insights. . 1. What are the methods for low-nitrogen combustion? Besides using low-nitrogen burners, what other options are there? ? ? 2. Is the low-nitrogen combustion retrofitting aimed at a specific type of boiler? For boilers such as coal powder boilers and gas boilers, what about circulating fluidized bed boilers, chain stoves, and the like? 3. What is the current trend in low-nitrogen combustion upgrades? 4. In China, which company is the best for working in this field? ? There are many questions; I hope that professional engineers and experts will kindly offer their guidance! ! Thank you! !