Abstract:

The method of urea pyrolysis for ammonia denitrification has been widely used in the denitrification technology of thermal power plants due to the safety of raw materials and the maturing technology. However, crystallization of the pyrolysis furnace occurs frequently. In order to avoid crystallization and environmental events, based on the experience of operation, the judging basis and treatment method of the crystallization of the pyrolysis furnace were introduced. The causes of the crystallization from the point of view of system design and operation adjustment was expounded. The optimization scheme of the system design for the pyrolysis furnace and operation adjustment methods was given. The engineering practice shows that timely and accurate crystallization judgement, effective operation adjustment method and optimized heat release nitrate system can effectively prevent the crystallization of the pyrolysis furnace and eliminate the occurrence of environmental protection events.

Key words: pyrolysis principle, technological process, accident treatment, crystallization reason, optimized scheme, operation adjustment