Classification
Desulfurization tower
The desulfurization tower is the core environmental protection equipment for removing sulfur dioxide (SO ₂) from industrial flue gas (such as coal-fired power plants, steel mills, cement plants). The mainstream is the limestone gypsum wet spray tower, which has the most mature technology and the highest efficiency (≥ 99%).
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Product details
The desulfurization tower is the core environmental protection equipment for removing sulfur dioxide (SO ₂) from industrial flue gas (such as coal-fired power plants, steel mills, cement plants). The mainstream is the limestone gypsum wet spray tower, which has the most mature technology and the highest efficiency (≥ 99%).
1、 Core working principle (limestone gypsum method)
Sulfur containing flue gas enters from the lower part of the tower and flows from bottom to top; The 3-5 spray layers at the top of the tower atomize the limestone slurry and spray it downwards, causing the flue gas to come into contact with the slurry in reverse flow.
1. Absorption reaction: SO ₂ in the flue gas dissolves in water and reacts with calcium carbonate (CaCO ∝) in the slurry to form calcium sulfite (CaSO ∝).
2. Oxidation reaction: Air is blown into the bottom of the tower to forcibly oxidize calcium sulfite to calcium sulfate (CaSOx).
3. Crystallization discharge: Calcium sulfate combines with water to form dihydrate gypsum (CaSO ₄・ 2H ₂ O), which is recovered as a by-product of building materials; The purified flue gas is dehydrated by the demister and discharged from the top of the tower. Total reaction equation: 2CaCO3+2SO2+O2+4H2O → 2CaSO4 ⋅ 2H2O+2CO2 ↑
2、 Core structure composition (bottom-up)
1. Slurry pool area (tower bottom)
1. Store the reaction slurry for oxidation and crystallization.
2. Core components: mixer (anti sedimentation), oxidation duct (aeration), gypsum discharge pump.
2. Spray absorption zone (main body of the tower)
1. The core area of gas-liquid reaction, where the flue gas and slurry are in full contact.
2. Core components: slurry circulation pump, spray pipeline, silicon carbide nozzle (atomizing slurry).
3. Mist removal zone (tower top)
1. Separate the slurry droplets carried in the flue gas to prevent "gypsum rain" and downstream corrosion.
2. Core components: two-stage/three-stage ridge type defogger, automatic flushing system.
4. Tower body and accessories
1. Carbon steel shell, inner wall glass flakes/stainless steel anti-corrosion; Equipped with manholes, maintenance platforms, and online monitoring of temperature/pressure/pH.
3、 Core technical parameters (mainstream thermal power)
● Processing air volume: 300000 to 1.5 million m ³/h
● Desulfurization efficiency: ≥ 99% (ultra-low emissions)
Export SO ₂ concentration: ≤ 35 mg/m ³
Empty tower flow velocity: 3.5~4.0 m/s
● Slurry pH value: 5.5~5.8 (optimal reaction range)
● Applicable temperature: inlet approximately 120-150 ℃
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