Seeking help regarding denitration of gas boilers
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Currently, 20-ton, 40-ton, and 80-ton gas boilers are used for heating, with a requirement that NOx levels be reduced to below 50 mg/m3. What technical approach would be suitable in this case? Can SNCR technology be used in gas boilers? It seems that no relevant engineering examples or literature have been found.
This boiler is too small; it’s difficult for manufacturers of denitration equipment used in power plants to replicate such a design here. For example, denitration equipment used in power plants costs tens of millions of yuan, and creating a similar small-scale device would also cost hundreds of thousands of yuan. You’d better find a flowchart and calculate and design it by yourself. I’m also planning for this matter. Beijing’s low-nitrogen requirement is 80 mg/m3 for gas boilers.
SNCR is used in coal-water slurry boilers; for fuel and gas, low-nitrogen burners can be considered
Are there low-nitrogen burners for fuel and gas with a capacity of over 20 tons? For the flue gas denitration of this small boiler, one will have to conduct experiments first to see how it works. Using the SNCR method, it is estimated that the level cannot be reduced to below 50 mg/m³, as its denitration efficiency is below 60%. To achieve emissions of 50 mg/m³ or less, the denitration efficiency must be at least 80%; even with SCR and two layers of catalysts, the efficiency is only 75%.
Mine is a peak-shaving boiler for thermal applications; its furnace is different from that of coal-fired boilers, so we can’t just use the design manuals for power plant boilers, right? Is SNCR feasible for such gas boilers? There’s no place to put the SCR. . .
Beijing requires the level to be reduced to 80mg/m3, and low-nitrogen burners still fail to meet this requirement. Why can’t SNCR be used in gas boilers? Would it be easy to design if I did it myself?
I am also upset about this matter. What industry are you in? Can we have further communication? My email is ustbwhh@163.com. :)
This post was last edited by hhg65195 on 2015-8-28 at 14:03. I work in boiler design, and I have also been paying attention to this issue and thinking about it for a long time. 1. SNCR requires that the reaction time be greater than 0.5 seconds at temperatures between 900 and 1100°C; temperatures outside this range or reaction times shorter than this value are not acceptable. Such areas can be found on power station boilers, while it is difficult for small boilers to meet this requirement alone. 2. The maximum efficiency of SNCR is 60%, while in practice it is usually around 40%. The escaped NH3 still needs to be treated – how should it be dealt with? 3. The denitration efficiency of pure SNCR is low, making it difficult to meet environmental standards for flue gas emissions. 4. SCR is used in small boilers, which results in high investment costs. The materials used for the catalytic beds contain elements such as titanium and vanadium; the cost of these materials is over 20,000 yuan per ton, and they last only about 5 years. However, basically all of the above problems can be solved.
SNCR cannot be used with gas; as far as I know, it’s not possible.
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Our company specializes in nitrogen oxide treatment equipment for gas boilers; feel free to contact us at m15265368333 if you need it