Compact Urea Hydrolyser - An Integrated Equipment for Efficient Flue Gas Cleaning in Small Incineration Plants

presentation, poster

English

The long-term policy in the energy industry is associated with continuous emission limits tightening of the energy-producing plants. To fulfill all these current or upcoming requirements, company EVECO Brno is active in the new flue gas cleaning technology development. Currently, its research is focused on the Compact Urea Hydrolyser (CUH) development, as a possible and economically viable device for an efficient NOx reduction in small incineration plants. Currently, there are two mostly used reagents for NOx reduction – Urea and Ammonia. Urea provides a safe and cheap solution in terms of transport and handling; however the NOx removal efficiency is poor (around 50%). Ammonia application can remove up to 90% of NOx, however it is a hazardous substance, which increases the cost for transport, handling, and storage. Ammonia can be produced from the Urea solution by the endothermic hydrolysis reaction, where gaseous Ammonia is generated in a pressure vessel at increased temperatures around 140-160°C. This way the Ammonia can be generated immediately before its injection to the flue gas stream, therefore all risks with transport and storage are eliminated, while high NOx removal efficiency is reached. The case study reveales that for a standard small waste incineration plant with capacity 2,400 tons of waste and production 40,370 tons of MP steam per year, the CUH unit requires 5.85 kW thermal energy input to the 75 L reactor. The reactor can be heated by produced steam (therefore integrated to the plant) consuming only 9.95 kg of steam per hour, which is only 0,19% of overall steam production.

Urea hydrolysis; ammonia production; flue gas denitrification

FREISLEBEN, V.

20. 10. 2020

1

14

14

SPIL2020-prezentace.pdf