Combustion and heat-exchange system

The smoke blowed by induced draft fan into desulfurization tower goes up evenly from the lower middle (flow velocity is 2.5 to 3.2 m/s) and in turn goes through high-density spray washing reaction zone and absorption reaction zone formed by three-level spray system.

The solution via spiral nozzle produces fine droplets, which provide large contact area to mix completely with flue gas flow and allow sufficient physical and chemical reaction of character and thermo-exchange between gas and liquid. Droplets absorb SO2 and catch dust particles when fall down, so as to achieve efficient removal of SO2. The caught dust particles down flow into the bottom of desulfurization tower and will be discharged from the overflow aperture into setting pond. Desulfurized smoke continues to rise, and after striking the folded plate of the first-level dehydration mist device equipped in the desulfurization tower for many times, it turns into bigger droplets which will fall after its separation with smoke, and the smoke goes out through the upper cylinder cone part, and the whole dust removal desulfurization process is completed.

The waste liquid containing dust is discharged into the sedimentation tank through the overflow hole at the bottom of the barrel (the overflow hole is designed with water seal to prevent air leakage and equipped with cleaning hole to facilitate the cleaning of the bottom of the barrel), and will be recycled after precipitation (ash removal) and alkali addition (regeneration).