How to handle ammonium bisulfate generated after ammonia injection for SCR denitration?
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Our catalytic unit is equipped with an SCR denitration system, and severe ammonium bisulfate crystallization occurred just one week after ammonia injection. The exhaust gas pressure at the smoke extractor outlet increased from 11 kPa to 15 kPa, and the power of the motor rose from 450 kW to 800 kW. The flue gas temperature of the waste heat grate increased from 161°C to 182°C. I would like to ask everyone how to adjust the operations?
To improve the denitration efficiency of the SCR denitration process, the molar ratio is usually kept above 1; this leads to ammonia escape during the denitration process, ultimately resulting in the formation of ammonium hydrogen sulfate crystals at the ammonia injection ports and a decrease in the heat exchange efficiency of the heat exchange elements. The formation of ammonium hydrogen sulfate can be reduced by controlling the ammonia escape during the SCR denitration process and the oxidation rate of SO2 in the flue gas ； Reasonably control the operating time of the SCR denitration device at low load levels ； Measures such as selecting heat exchange elements with an enamel coating can effectively reduce the occurrence of crystallization. :)
Has the original poster’s issue been resolved yet? Could you give an introduction? Let’s learn it too, thank you!