Flue gas from coal-fired boilers
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Can anyone tell me: what are the components of the flue gas from coal-fired boilers and what is the range of dust particle sizes? Thank you so much!
The main components of flue gas from coal-fired boilers are dust, sulfur dioxide, carbon dioxide, nitrogen oxides, etc； The particle size range of dust varies depending on the type of boiler; generally, dust particles are larger in chain boilers, while they are smaller in circulating fluidized bed boilers.
Technical parameters of flue gas from the boilers in a company’s thermal power plant: 1. Our company currently has six high-temperature, high-pressure circulating fluidized bed boilers with a steam generation capacity of 160 t/h each, and two such boilers with a capacity of 240 t/h each. The data below refer to the flue gas emission parameters for one of the 160 t/h boilers. 2. The flue gas parameters are as shown in the table below: Sequence Number, Name, Unit, Value, Remarks. 1. Flue gas volume discharged, Nm3/h: 263,885. 2. Volume of flue gas per kilogram, Nm3/kg: 6.637. 3. Flue gas temperature, °C: 143. 4. Pressure, Pa (G): 3000, at the inlet of the exhaust fan after the water film dust collector. 5. Composition analysis: SO2, mg/m3: 590–1500; CO2, %: 10–13; CO, %: 3.5–6; O2, %: 1.8–3.1; NO, NOx, etc., %; Dust content, mg/m3: 160–450
The main components of flue gas from coal-fired boilers include dust, sulfur dioxide, carbon dioxide, nitrogen oxides, as well as nitrogen, oxygen, water vapor, and others. Depending on the excess air coefficient and the composition of the fuel, the proportions of various components vary; the principles of flue gas composition and enthalpy calculation are detailed in \"Principles of Boilers\". As for particle size, those that are fine enough to be above 400 mesh are difficult to remove using a cyclone dust collector; generally speaking, a cyclone dust collector is not capable of reducing the dust content in the exhaust gases to meet environmental standards.
I agree with what was said on the 4th floor: by providing the composition of the coal and the excess air coefficient, it is possible to theoretically calculate the composition of the flue gases.