Ammonia scale problem caused by ammonia injection in the desuperheating section of the waste heat boiler
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The old flue gas waste heat boiler was modified by adding a denitration module between the evaporator and the economizer, and ammonia water was injected at the rear end of the water seal tank to remove nitrogen oxides from the flue gas; the denitration effect was good. However, the flue gas exhaust temperature increased by 10 to 15 degrees, and the steam generation capacity of the evaporator decreased by about 1.5 tons. Currently, shock wave soot blowers are used for soot cleaning in the furnace; each time soot cleaning is performed, the exhaust temperature decreases, which suggests that scaling has occurred on the furnace tubes. During the furnace renovation, all furnace tubes were replaced; over time, corrosion beneath the scale will significantly shorten the lifespan of these tubes. Do any of you have any good suggestions?
What is the nitrogen oxide level at the inlet of your flue gas denitration system? We catalyze the flue gas; after dust removal, the nitrogen oxides content in the flue gas is no more than 30, and only desulfurization treatment (using ammonia) is carried out
I really don’t know about this; there’s only data available after removal. Nitrogen oxides are formed during the combustion process – can that also be controlled? Oxidizer? Are you also using the ammonia-sulfuric acid AN fertilizer method for desulfurization? What is the effect? Is the ammonia fertilizer treatment carried out inside or outside the tower? Have there been any issues with corrosion and blockage?
For dust removal and desulfurization, we carry out desulfurization and dust removal in the absorption tower after ammonia injection. The data on nitrogen oxides before entering the waste heat boiler is unknown; only the data after removal is available! It is assumed that it must be quite high!
For dust removal and desulfurization, we carry out desulfurization and dust removal in the absorption tower after ammonia injection. The data on nitrogen oxides before entering the waste heat boiler is unknown; only the data after removal is available! It is assumed that it must be quite high!
The flue gas coming from the waste heat boiler has a temperature of 180–200 degrees; after passing through the bag filter for dust removal, it enters the desulfurization tower for desulfurization
The temperature of the flue gas exiting the waste heat boiler is around 180 degrees; water is sprayed on it before it enters the absorption tower to lower its temperature to around 60 degrees. Wet electrostatic dust removal is used for dust removal, and microporous filters are employed for sulfur treatment Have you had problems with thiamine crystals clogging things up? There’s also corrosion of the absorption tower!
The material of our absorption tower is 316L, and crystallization blockage can also occur