Can the stripped acid gas be fed directly into the furnace for combustion?
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This post was last edited by Shandong Huaxing on 2010-6-8 at 23:29. The combustion furnace in our facility uses ammonia-burning nozzles; steam is introduced at the front to strip acid gas and regenerate acid gas, while a portion of the regenerated acid gas is introduced in the middle – approximately 20%-30% of the total amount. Can the stripped acid gas be fed into the furnace for combustion alone? Why?
This post was last edited by Shandong Huaxing on 2010-6-8 23:29. Under specific operating conditions, it is not impossible to handle it separately. But you are aware of the disadvantages: if the stripping gas contains a certain amount of ammonia, and if the furnace temperature is not above 1250 degrees, decomposition does not occur properly, which can have negative effects on the catalyst as well as cause corrosion and pipe blockages. Perhaps adding fuel gas or hydrogen can help raise the furnace temperature, but it’s not a good idea. . . . So. . . I’m afraid no one will support you in doing this. .
This post was last edited by Shandong Huaxing on 2010-6-8 at 23:29. The ammonia extraction process using side streams involves a high concentration of hydrogen sulfide gas; the temperature can reach 1260°, but the amount of this gas is not large. The ammonia content in the top ammonia extraction process is very high, but the amount of acidic gas is large. Short-term emergency use can involve entering the furnace separately, but in the long term it is harmful to the system.
This post was last edited by Shandong Huaxing on 2010-6-8 at 23:29. The hydrogen sulfide content in the stripping gas is very low; to ensure complete decomposition of ammonia, the combustion temperature must be at least 1250 degrees. If air is used as an oxidizer, it is difficult to reach this temperature in the combustion furnace, which necessitates the use of supplementary combustion, resulting in high fuel gas consumption.
Under normal circumstances, the proportion of stripped acid gas (i.e., gas containing acids) in the total amount of acidic gas should not exceed 50%. Otherwise, it is difficult to reach the temperature required for ammonia combustion in the reactor.