SafeDeNOx Urea to Ammonia
Chemithon's patented SafeDeNOx® process economicaly generates ammonia from urea for Selective Catalytic Reduction (SCR) and Selective Non-Catalytic Reduction (SNCR) of nitrous oxides (NOx). Our process is a safe alternative to shipping, handling, and storing anhydrous or aqueous ammonia (classified as toxic materials). Urea is non-hazardous and can be stored safely on site.
Unlike other processes for generating ammonia, our SafeDeNOx® process involves melting granular urea rather than dissolving it in water. Our captial and operating costs are lower because less equipment and energy are required.
The product gas is a mixture of ammonia (NH3), carbon dioxide (CO2), and water vapor. The overall reaction for converting urea to ammonia is:
NH2CONH2 + H2O (steam) --> 2NH3 + CO2 + H2O
Our unique process uses a catalyst to accelerate the reaction so the system responds quickly to changes in ammonia demand. Only a few minutes are required to reach equilibrium when feed rates change. Non-catalytic systems require about 20 times as much urea in solution for the same ammonia production rate. As a result the non-catalytic systems are larger and their process takes much longer to reach equilibrium when feed rates change.
Because temperature and pressure are kept constant during production rate changes, our system produces a gas mixture with a constant ratio of ammonia to carbon dioxide and water vapor. So the amount of ammonia injected into the flue gas follows ammonia demand. In other systems where the temperature or pressure varies, the reaction is not at equilibrium during production rate changes. As a result, the ratio of ammonia to carbon dioxide and water vapor in the product gas varies, making control of ammonia slip very difficult.
The SafeDeNOx® process is the most advanced and cost-effective on the market as well as a cost-effective and safe alternative to using anhydrous or aqueous ammonia for NOx reduction.
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