The working principle of baking soda (sodium bicarbonate) used for flue gas desulfurization
Sodium bicarbonate (baking soda, NaHCO3) can be used as an adsorbent for flue gas desulfurization. It removes acidic pollutants in the flue gas through chemical adsorption. At the same time, it can also remove some inorganic and organic trace substances through physical adsorption. Spray the fine sodium bicarbonate powder directly into the high-temperature flue gas, and the sodium bicarbonate decomposes at high temperature to produce sodium carbonate Na2CO3, H2O and CO2.
NaHCO3 + HCl → NaCl + H2O + CO2
2NaHCO3 + SO2 + ½ O2 → Na2SO4 + H2O + 2CO2
NaHCO3 + HF → NaF + H2O + CO2
Generally, the flue gas temperature is between 140 and 250 °C. Due to the high activity of sodium bicarbonate adsorbents, a slight excess of sodium bicarbonate (stoichiometric factor between 1.1 and 1.3) is usually sufficient.
Due to transportation and storage, sodium bicarbonate raw materials are usually coarse particles (D50 value is about 200 microns). To achieve higher reactivity, the adsorbent must have a larger specific surface area. Therefore, the sodium bicarbonate must be ground to a certain fineness before being injected into the flue gas pipe. For example, to remove SO2, the fineness of sodium bicarbonate must reach D90 <20μm; and to remove HCl, only D90 <35μm is required. If the system is operated correctly, it can remove more than 95% of SO2; the removal rate of HCl can even reach 99%.
(Sodium bicarbonate) Air Classifying Mill
Remove more than 95% of SO2 and 99% of HCl in exhaust gas
It is widely used in municipal waste incineration, hazardous waste incineration, sludge incineration, cement plants, glass plants, steel plants coke ovens and other industries to remove acidic substances in exhaust gas, such as SO2, HCl, etc.
Advantages of the special sodium bicarbonate grinder produced by EPIC Powder
Dry desulfurization process treatment
Dry process desulfurization can remove more than 95% of SO2 and 99% of HCl
Easy to take apart and wash
Compact structure, easy to disassemble and wash. Optional CIP.
Quick maintenance
The mill with a power-assisted flip device, and the fan has an overhaul hole.
Low investment and low cost
The process is simple and reliable, low investment & operating cost.
Low failure rate and stable operation
Suitable for continuous operation, annual operation time exceeds 8000 hours.
Large air volume inlet design
The design of large air volume can reduce the grinding temperature.
Clean and environmentally friendly
The whole system is closed with less dust and low noise.
Non-irritating, non-toxic
Additives (sodium bicarbonate) and residues Non-irritating, non-toxic.
Integrated design of crushing and classification
Get the ideal product particle size by adjusting the speed of the grading wheel.
Intelligent control system
One-key operation, online monitoring of key parameters.
Narrow particle size distribution
Particle size D90: 10~45 microns. Good shape and narrow particle size distribution.
Automatically adjust the injection amount of desulfurizer
Adjust the amount of desulfurization agent injected based on the fluctuation of the concentration of harmful substances.
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We can provide processes and equipment that meet the following performance indicators
Air Classifying Mill
Remove more than 95% of SO2 and 99% of HCl in exhaust gas
The raw material of sodium bicarbonate (baking soda) is uniformly sent to the grinder through the quantitative feeder in the lower part of the silo for ultra-fine grinding, and the product with particle size (D90: 20μm or the product size can be flexibly adjusted according to the need of deacidification) is transported by the high-pressure fan. Go to the flue gas pipe and spray it into the flue gas, and quickly produce a chemical reaction with the acid-containing flue gas. At high temperature, sodium bicarbonate decomposes into sodium carbonate Na2CO3, H2O and CO2. The newly formed sodium carbonate Na2CO3 has high reaction activity at the moment of formation, and can efficiently react with the acidic substances in the flue gas.
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