For a 35-ton double-bed sulfurization bed boiler, how can denitration using SNCR be achieved to keep nitrogen oxide levels below 50 mg? Please provide solutions
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For a 35-ton double-bed circulating fluidized bed boiler, how can denitration using SNCR be achieved to keep nitrogen oxide levels below 50 mg? Seeking solutions. The current national standards are 300 for sulfur dioxide, 300 for nitrogen oxides, and 50 for dust. The local standards will take effect in mid-December; how can we meet these standards without installing an SCR system? The temperature inside the furnace is normally between 850 and 1050 degrees, and things are fine for now, but the requirements are too low – what solutions are there for the 50 mg limit? The main bed now has 6 nozzles with a flow rate of 80 kg per hour, while the secondary bed still doesn’t have any nozzles installed. I would appreciate some advice from experts.
Dongguo’s double-bed boiler (CFDB)? The bed temperature of this type of furnace is slightly higher than that of CFB, making it more suitable for using bituminous coal with low volatility. As far as I understand, the NOX levels in the exhaust gases are also higher (it hasn’t been measured). The efficiency of SNCR ranges from 30% to 80%, depending on the NOX emission concentration before the injection of the spray gun; if this concentration is too high, it becomes difficult to use this process. It is recommended that the original poster compare the NOX concentrations before and after using the spray gun on the main bed; if the denitration efficiency is too low, it seems that this process isn’t very profitable. I use CFB boilers here, and the emission standards for power generation boilers are being applied; the concentration of dust particles is 30 mg/Nm3, while SO2 and NOX levels are both 200 mg/Nm3. Only dust removal and desulfurization processes are in use at present, with no denitrification process yet implemented, but actual emissions can still be reduced by half through these measures. We also heard that the NOX emission standards are set to be lowered, and we are currently making technical preparations. Extra pressure of around 1000 Pa is required for extracombustion denitration, which means that the fans will need to be modified. The 2nd floor is a bad idea – it dilutes the smoke. Not to mention whether the system fans can handle it, the remote online monitoring devices will immediately transmit the flow rate from the chimney to the environmental protection agency, and then complaints will follow!