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    Waste gas treatment equipment for cyclone plate columnSodium hydroxide is used as desulfurizer to absorb sulfur dioxide in the desulfurization tower.

    来源:传梦催化燃烧 整理发布   时间:2018-08-14

    Sodium hydroxide is used as desulfurizer to absorb sulfur dioxide in the desulfurization tower. The reaction rate is fast and the desulfurization efficiency is high. However, the desulfurization product Na2SO4 is difficult to be treated, which is easy to cause serious secondary pollution. A double alkaline flue gas desulfurization process was used to regenerate the product absorbed by sodium hydroxide with lime. Only a small amount of Na2SO4 was brought into the gypsum slurry. The gypsum slurry doped with a small amount of Na2SO4 was pumped into the cyclone separator for solid-liquid separation. A large number of solid residues with low water content were separated. It was beaten to the slag field for stacking, and the solution went back to the regeneration tank to continue to use, so it would not cause two pollution.

    cuihuaranshaoCompared with limestone or lime wet desulphurization process, double alkali method has the following advantages in principle:
    (1) Desulfurization with NaOH, the circulating water is basically NaOH aqueous solution, and there is no corrosion and blockage in the circulating process to the pump, pipeline and equipment, which is convenient for equipment operation and maintenance.
    (2) The regeneration of absorbent and the precipitation of desulfurization residue occur outside the tower, which can avoid the blockage and wear in the tower, improve the reliability of operation and reduce the operation cost; at the same time, the high efficiency plate tower or packing tower can be used to replace the empty tower, so that the system is more compact and the desulfurization efficiency can be improved.
    (3) Sodium-based absorbent can absorb SO2 quickly, so it can use less liquid-gas ratio to achieve higher desulfurization efficiency, generally more than 90%;
    (4) for the integrated technology of desulfurization and dust removal, the utilization rate of lime can be increased.
    The disadvantage is that Na_2SO_4, a by-product of NaSO_3 oxidation, is difficult to regenerate and needs to be continuously supplemented with NaOH or Na_2CO_3 to increase the consumption of alkali. In addition, the presence of Na2SO4 will also reduce the quality of gypsum.

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