Urea Pyrolysis Furnace SCR Denitrification Equipment

     Urea Pyrolysis Furnace SCR Denitrification Equipment

     The urea pyrolysis furnace SCR denitrification equipment is a key technological device in the field of industrial flue gas denitrification. Through the synergistic effect of urea pyrolysis for ammonia production and SCR catalytic reduction reaction, it achieves high-efficiency denitrification. The following provides a detailed analysis from the perspectives of equipment principles, technical characteristics, application scenarios, and operation and maintenance:

    Equipment Principles and Composition

1. Urea Pyrolysis Furnace
   • Function: Pyrolyzes urea solution at high temperature to produce ammonia gas (NH₃) and carbon dioxide (CO₂), which serve as reducing agents for the SCR reaction.
   • Working Process: The urea solution is delivered to the pyrolysis furnace by a metering pump, where it decomposes into NH₃ and CO₂ at temperatures between 350-650°C. The resulting gases are evenly injected into the SCR reactor through an ammonia injection grid.
   • Key Design:
     • Heating Method: Electric heating, flue gas heating, or natural gas combustion heating can be used.
     • Material Selection: The furnace body is typically made of 304 stainless steel or 316L stainless steel, offering corrosion resistance and high-temperature durability.
     • Safety Measures: Equipped with explosion-proof devices, temperature and pressure monitoring systems, and ammonia leakage alarm systems.
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2. SCR Denitrification Reactor

   • Function: Under the action of a catalyst, NH₃ undergoes a selective catalytic reduction reaction with nitrogen oxides (NOₓ) in the flue gas, producing nitrogen (N₂) and water (H₂O).

   • Reaction Equations:

4NO+4NH3+O2→4N2+6H2O

2NO2+4NH3+O2→3N2+6H2O

• Catalyst Types:
  • Honeycomb Type: Large specific surface area, high activity, suitable for high-dust environments.
  • Plate Type: Strong wear resistance, suitable for high-ash flue gas.
  • Corrugated Plate Type: Low pressure drop, strong resistance to poisoning, suitable for complex working conditions.