Process and device for reducing nitrogen oxides in the exhaust of a combustion plant

摘要

The method involves melting solid, pure urea and introducing the resulting product into the exhaust gas as a reduction agent. The melting process involves heating the urea to a temperature of no higher than 250 degrees C, preferably no higher than 160 degrees C. A liquefying and injection arrangement melts the urea and injects the resulting product in a controlled manner into the exhaust gas.