What is the impact of ammonia on sulfur recovery?
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What is the impact of ammonia on sulfur recovery?
This post was last edited by ylb913 on 2016-11-25 07:02. Poor ammonia combustion has two consequences: first, it leads to the formation of salts that can clog the equipment; second, it accelerates the sulfation of the alumina catalyst, thereby speeding up its deactivation.
The impact is significant; the presence of NH3 in the system causes it to react directly with H2S, SO2, and even SO3 to form salts. Even if the impact is minor, it still increases the pressure drop across the entire system. The pressure in a sulfur recovery system is already low, approaching atmospheric pressure； It has a significant impact, as it directly blocks the equipment pipelines and causes the installation to stop operating ； It will also cause excessive NOX levels in the flue gases, which will result in a fine being imposed on you – no discussion possible.
I’m afraid to ask, but what is the mechanism of sulfation of alumina catalysts? Logically, the oxidizing capacity of NO or NO2 produced by ammonia combustion shouldn’t be high, right?
Firing processes require high heat, which necessitates a high furnace temperature
1. Burning ammonia is not good, as it can cause excessive nitrogen oxides in the chimney exhaust； 2. Ammonium salts form in the system, causing blockages ； 3. Catalyst sulfation: When the acidic gas contains ammonia, it is partially oxidized to nitric oxide in the reaction furnace; this substance acts as a catalyst for the oxidation of sulfur dioxide in the gas phase to sulfur trioxide, which is one of the reasons for catalyst sulfation poisoning ；