Ammonia production via urea hydrolysis is used in power plants for emissions reduction – \"Remove one Sun Wukong, and another monkey takes its place\"”
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This post was last edited by ghyjy2009 on 2015-10-14 at 10:41. The hydrolysis of urea to produce ammonia for use in denitrification in power plants seems like a good idea; it might offer cost advantages at certain stages； However, carrying out denitrification at the cost of carbon emissions is not worth it from an environmental perspective, and it has little significance in the long term: on one hand, if a carbon tax is imposed, what is the advantage in terms of cost? Secondly, it is recommended that power plants adopt a combined approach of denitration and urea treatment; using a urea solution of appropriate concentration for direct hydrolysis, or ammonia water of suitable concentration, would be more suitable for this project. However, in the long term, carbon recovery from exhaust gases also represents a challenge.
Currently, environmental protection focuses more on the emissions of sulfur and nitrogen; regulations regarding carbon emissions are not as strict, which is why this situation exists
Our factory uses the ammonia method； At that time, the supplier also mentioned the urea method ； I just don’t understand ； The urea method also utilizes the ammonia present inside ； Spending a lot of money on urea ； Further decomposed into ammonia water ； Then it’s better to use the ammonia method directly
There are significant differences between the ammonia method and the urea method; what is the cost comparison like?
From a safety perspective, urea is highly safe and easy to store, while ammonia has a lower safety level and requires stricter storage conditions
Initially, liquid ammonia was used as the SCR reducer, as it is the most economical option. However, for power plants, storing and managing liquid ammonia is extremely inconvenient. Additionally, there have been several accidents involving liquid ammonia tanks in power plants in recent years; hence, the use of urea to produce ammonia was adopted. This choice is mainly driven by considerations of safety and management, although the operating costs for power plants using this method are higher than those with liquid ammonia. When high denitration efficiency is not required, SNCR systems can also directly use ammonia water and urea solutions
Initially, liquid ammonia was used as the SCR reducer, as it is the most economical option. However, for power plants, storing and managing liquid ammonia is extremely inconvenient. Additionally, there have been several accidents involving liquid ammonia tanks in power plants in recent years; hence, the use of urea to produce ammonia was adopted. This choice is mainly driven by considerations of safety and management, although the operating costs for power plants using this method are higher than those with liquid ammonia. When high denitration efficiency is not required, SNCR systems can also directly use ammonia water and urea solutions
The furnace ash has a strong ammonia smell, and there is no caking in the tail flue. How can the concentration of the ammonia solution used for injection be adjusted to 10%?