The desulfurization products of coke oven flue gas are coated on bags or catalysts
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This post was last edited by dmz329227 on 2017-5-22 at 16:14. During ammonia-based or alkali-based desulfurization, SO2 in coke oven flue gas is partially converted to SO3 under the action of a catalyst. SO3 reacts with NH3 and sodium to form NH4HSO4 and NaHSO4. The melting point of NH4HSO4 is 147°C, while its boiling point is 350°C; the melting point of NaHSO4 is 58.5°C, with a boiling point of around 315°C. At temperatures below 350°C, these substances become very viscous and can adhere to the surface of the catalyst, thereby reducing its performance. This phenomenon has occurred; how to solve it? Are there any clever tricks?
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Many companies encounter this problem, and this is one of the disadvantages of SCR
SCR denitration should take place in the high-temperature section first, followed by wet flue gas desulfurization; the sulfurous acid (sulfuric acid) on the surface of the denitration catalyst is decomposed at high temperatures using a heating furnace for exhaust gas, which helps to maintain the performance of the catalyst