Flue gas contains a large amount of acidic gases. After a large amount of data and experiments, it has been found that only when sodium bicarbonate (baking soda, NaHCO3) is small enough to a certain extent, can it react with the acidic components in the flue gas with greater efficiency. It removes acidic pollutants in flue gas through chemical adsorption, and can also remove some inorganic and organic trace substances through physical adsorption. This process sprays sodium bicarbonate fine powder directly into high-temperature flue gas. At high temperatures, sodium bicarbonate decomposes to produce sodium carbonate Na2CO3, H2O and CO2. Typically, with flue gas temperatures between 140 and 250 °C, a slight excess of sodium bicarbonate (stoichiometric factor between 1.1 and 1.3) is usually sufficient due to the high activity of the sodium bicarbonate adsorbent.   

CAM-VZ positive pressure air grinder

The problem of equipment fouling in negative pressure air grinding systems is often the focus of discussion. Cleaning of equipment, especially conveyor fans, is too time-consuming. In addition, the scale on the fan impeller may peel off during the startup and shutdown processes, causing vibration of the fan and oscillation of its operating status. Therefore, you can consider changing the negative pressure process to a positive pressure process. In the new working mode, the fan is installed before the classifying mill to force process air into the grinding system. The advantage of this working mode is that the ground sodium bicarbonate is not transported through the fan, completely avoiding the problem of fan fouling. In addition, the power consumption of the fan has also been reduced, making the operating cost lower, but it has put forward a higher test for the sealing performance of the equipment. There are strict requirements for the design structure, processing accuracy and coordination of the equipment, and the cost of the equipment has also been will be higher.

Dry adsorption process has made breakthrough progress in removing gaseous inorganic pollutants. This process has become one of the standard processes for removing hydrogen chloride, hydrogen fluoride and sulfur oxides, and is especially suitable for online purification of flue gas from incineration plants.

Through new developments in process and equipment technology, the performance of the dry flue gas purification process is completely comparable to the more efficient wet process. The suitability and economics of dry flue gas purification processes using sodium bicarbonate require individual analysis in each case。

The use of the Perlman CAM series sodium bicarbonate grinding system will make an important contribution to this achievement. The grinding system is flexible and customizable, and the simple and durable equipment effectively improves the availability of the process and the reliability of the flue gas purification process.

Technical Parameters