First, the quality of the limestone
Typically, the weight rate of calcium carbonate in the limestone should be higher than 85 %, the content is ever low is due to the impurities to run, resulting in the absorbers consumption and increased transportation costs, decreased gypsum purity.
Limestone quality by the CaO content, the higher the limestone purity, the better the desulfurization efficiency. During the mingle design, process design, it is essential to calculate the chemical composition, but also to understand its intrinsic properties. The limestone is a product of the calcium oxide content of 48 % to 54 %; limestone does not necessarily lack the CaO content the higher the better. CaO> 54 % limestone, and its high purity and the marble, not grinding, chemical stability is also not right to use as a desulfurization agent.
Second, the fineness of the limestone
The fineness of the limestone powder is an important factor affecting the desulfurization efficiency, reaction contact area largely determines the speed of chemical reactions, limestone powder, the finer the quality the greater the specific surface area per unit mass of the contact area of the chemical reaction also greater. As the limestone dissolving reaction is solid - liquid two - phase reaction, the reaction rate of limestone particles is proportional to the specific surface area, therefore, smaller limestone particles dissolving performance, a variety of high reaction rate to a faster rate HSO3 - slurry reaction, leading to faster absorption of SO2 gas, high desulfurization efficiency and limestone utilization.
Limestone particle size smaller broken energy consumption is higher. Grinding finer limestone powder, the need for a larger mill consumption of a higher power, increased investment, which requires weighing the pros and cons, considering. Usually require the limestone powder through 250 mesh or 325 mesh sieve rate of 90 %.
Limestone powder particle size and the quality of limestone. In order to ensure that the desulfurization efficiency and limestone utilization reaches a certain level, when higher impurities in the limestone, limestone should be ground more finely.
Third, the reactivity of limestone
Limestone as the absorbent characteristics include not only its chemical composition, mainly including the alkali content of their reactivity, the desulfurization system is provided by the dissolution of the limestone powder, absorbent activity affect the solubility and dissolution rate of the absorbent is represents a in the acidic environment and transforming characteristics. The activity of the absorbent contains absorbent types of physico - chemical properties and the reaction of acidic environment. Physico - chemical properties of the absorbers including: purity, crystal structure, impurity content, particle size distribution, including the inner surface ( porosity ), total unit surface area and particle density. Activity was higher in the limestone in the case remain the same limestone utilization; you can reach a higher SO2 removal efficiency. Limestone high reactivity, the limestone utilization is also high gypsum excess CaC03 content is low, that is of high purity gypsum.
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