Particle Size Reduction Solution for Sodium Bicarbonate Used in Flue Gas Desulfurization
Baking soda (sodium bicarbonate)

Basic principle for flue gas desulfurization
Sodium bicarbonate (or baking soda, NaHCO3) is an effective adsorbent for flue gas desulfurization. It helps to neutralize acidic pollutants by chemical adsorption, and, can be used to absorb various inorganic and organic trace substances. This fine powder is sprayed straight into the high-temperature emissions, and is then broken down at high temperatures into components, such as sodium carbonate (Na2CO3), H2O and CO2.

The flue gas temperature generally ranges from 140 - 250°C. Sodium bicarbonate adsorbent works particularly well in this range, so an amount slightly greater than the needed amount (in the range of 1.1~1.3 times) is adequate.

For transportation and storage purposes, it is common for sodium bicarbonate to be coarse-grained (D50 approx. 200 μm). For maximum reactivity, however, it must be ground finer before being injected into the flue gas duct. This requires the D90 value to be less than 20 μm for SO2 removal and 35 μm for HCl removal. With correct system operation, SO2 can be reduced by more than 95% and HCl by up to 99%.
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Desulfurizer Mechanical Grinding Production Line Of a Chemical Enterprise In Beijing

Desulfurizer Mechanical Grinding Production Line Of a Chemical Enterprise In Beijing

A Beijing-based chemical enterprise, in pursuit of continuously improving their environmentally friendly protocols, came to depend on a renowned environmental protection company to recommend a suitable, dependable powder grinding machine. That's when they learned of ALPA, a company offering one of the most advanced and stable ultra-fine mechanical grinding machines in China. Our machine was providing results exceeding any national standards. After assessing the solution, the chemical firm opted to make ALPA their supplier.

  • Processing material: desulfurizer
  • Output: 3t per hour
  • Particle size of raw material: 1mm
  • Finished particle size: D90:15 μm
  • Case Address: Beijing
Flue Gas Desulfurization And Denitration Equipment For Large Coking Enterprise In Shanxi

Flue Gas Desulfurization And Denitration Equipment For Large Coking Enterprise In Shanxi

A renowned chemical enterprise located in Shanxi, in light of recent stricter environmental inspection, they sought to utilize sodium bicarbonate for flue gas desulfurization. After consulting the industry, they believe that ALPA could offer equipment capable of replacing Italian imports. Subsequent to this determination, they paid a visit to the plant, then decided to acquire two custom made ultra-fine desulfurization grinding mills as ALPA engineers recommend.

  • Processing material: sodium bicarbonate
  • Output: 1 t per hour
  • Raw material particle size: 100 mesh
  • Finished particle size: D 90: 5.84 μm
  • Case Address: Shanxi
Desulfurizer Grinding Production Line Of a Coking Plant In Nanyang, Henan

Desulfurizer Grinding Production Line Of a Coking Plant In Nanyang, Henan

The customer is a major chemical enterprise with a need for powders that is reliable and efficient when desulfurizing and denitrifying, meeting stringent environmental protection regulations. After some research and testing, they decided to invest in ALPA’s mechanical grinding mill and the final product was of a standard higher than the national environmental protection laws.

  • Processing material: desulfurizer
  • Output: 500 kg per hour
  • Particle size of raw material: 1mm
  • Finished particle size: D90: 14.3 μm
  • Case address: Henan
Objectives And Performance Measures Of Alpa’s Processes
  • Low failure rate and stable operation Designed for year-round usage with an operating time exceeding 8000 hours yearly.
  • Automatically adjusting the injection amount of the desulfurizing agent The amount of sulfur-removing additives injected is continuously monitored and adjusted as needed to ensure that the level of unwanted substances contained in the exhaust gas remains under control.
  • Large air intake design Large air intake to reduce the temperature for pulverizing. If a higher temperature is desired, the cold air machine may be a suitable choice.
  • Clean and environmentally friendly The whole system in a closed-loop system, reducing dust, keeping noise to a minimum, as well as resulting in a clean, environmentally-friendly production process.
  • Non-irritating and non-toxic Sodium bicarbonate, the auxiliary compound, is both non-irritating and non-toxic, as is the remaining residue.
  • Extremely easy to remove and wash This design is space-saving and the mill and fan are straightforward to take apart and clean. Additionally, online cleaning can be chosen to prevent material build-up and reduce down time.
  • Intelligent control system The ability to control all aspects of the process with a single press, as well as monitoring of sulfur dioxide concentrations, air volume, feed rate and grinding temperature.
  • Integrated design of grinding and classifying The ideal product size can be achieved by adjusting the speed of rotation of the classifier wheel.
Models available
ALPA is a highly respected name in particle and powder processing, transforming the way the industry views traditional powder processing. Our research and development initiatives have focused on dry grinding, classification and separation, powder shape control and surface modification of particles and powders over the past two decades. As a result, we are proficient in providing tailored, CE-certified products, such as air jet mills, mechanical mills, air classifiers, ball mill with classifier, surface modification lines and more.
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