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Cam-y baking soda grinder

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Air grading grinder

——Sodium bicarbonate grinding, a leading process of flue gas deacidification

Hazardous waste treatment steel plant coke oven thermal power generation municipal waste sludge incineration nonmetallic mineral ceramic industry glass manufacturing

With the more and more strict requirements of environmental protection laws and regulations, parman developed the process of sodium bicarbonate dry deacidification based on the advanced process in Europe and America, which has been applied more and more. Sodium bicarbonate was used as adsorbent to remove various pollutants in flue gas. Its purification effect can be compared with other known ways, such as the spray adsorption method using lime milk as adsorbent. Dry flue gas purification can not only be used in coal power plants, hazardous waste treatment, municipal waste or alternative fuel incineration plants, but also widely used in industrial furnaces in glass, cement, metallurgy and other industries. Dry flue gas purification can economically remove the gas containing acid substances, such as SO2, HCI, etc., and reach the national standard flue gas emission standard.

There are a lot of acid gases in the flue gas. After a lot of data and experiments, only when the sodium bicarbonate (sodium bicarbonate, NaHCO3) is small to a certain extent, it can react with the acid components in the flue gas with the maximum efficiency. It can remove acid pollutants in flue gas by chemical adsorption, and also remove some inorganic and organic trace substances by physical adsorption. In this process, sodium bicarbonate powder is directly injected into high temperature flue gas. At high temperature, sodium bicarbonate decomposes to Na2CO3, H2O and CO2.

Generally, the flue gas temperature is between 140 ° C and 250 ° C. due to the high activity of sodium bicarbonate adsorbent, a slight excess of sodium bicarbonate (stoichiometric factor between 1.1 and 1.3) is usually sufficient.

   

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The particle requirements are related to the composition of flue gas. The particle size required for SO2 and HCl removal will be different. Due to transport and storage reasons, sodium bicarbonate raw materials are usually coarse particles (D50 value is about 200 microns). In order to achieve high reactivity, the adsorbent must have a large specific surface area. Therefore, the sodium bicarbonate must be ground to a certain fineness before being injected into the flue gas pipeline. For example, to remove SO2, the fineness of sodium bicarbonate must be D90 < 20 μ M. The removal of HCl requires D90 < 35 μ M. If the system is operated correctly, more than 95% SO2 can be removed, and the removal rate of HCl can even reach 99%. In order to maintain the required sodium bicarbonate fineness in long-term operation, usually after grinding by air grinder, the adsorbent is transported by means of gas transmission and directly enters the flue gas pipeline through multiple nozzles to ensure its uniform dispersion in the pipeline. The design of this equipment is simple and durable. Compared with other flue gas purification methods, its investment and operation cost are lower.

The grinding process of sodium bicarbonate will be the core process of this technology.

Cam-y baking soda grinder

The problem of equipment fouling in the negative pressure air grinding system is often the focus of discussion. The cleaning of the equipment, especially the conveying fan, is too time-consuming. In addition, the scale on the fan impeller may also peel off during startup and shutdown, resulting in vibration of the fan and vibration of its running state. Therefore, it can be considered to change from negative pressure process to positive pressure process. In the new working mode, the fan is installed before the stage grinding, and the process air is pressed into the grinding system. The advantage of this working mode is that the ground sodium bicarbonate is not transported through the fan, which completely avoids the problem of fan fouling. In addition, the power consumption of the fan is also reduced, so that the operating cost is lower, but the sealing performance of the equipment is put forward a higher test, whether it is the design structure, processing accuracy and coordination of the equipment, there are strict requirements, and the cost of the equipment will be higher.

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The dry adsorption process has made a breakthrough in the removal of gaseous inorganic pollutants. This process has become one of the standard processes for the removal of hydrogen chloride, hydrogen fluoride and sulfur oxides, especially suitable for the on-line purification of flue gas in incineration plants.

Through the latest development of process and equipment technology, the performance of dry flue gas purification process is completely comparable to that of high-efficiency wet process. The applicability and economy of the dry flue gas purification process using sodium bicarbonate need to be analyzed separately for each case.

The palman cam grinding system of sodium bicarbonate is flexible and customized, and the simple and durable equipment greatly improves the usability of the process and the reliability of the flue gas purification process.



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