Lime Kiln Flue Gas Desulfurization, Denitrification, and Dust Removal Equipment

     Introduction to Lime Kiln Flue Gas Desulfurization, Denitrification, and Dust Removal Equipment:

     Lime kiln flue gas desulfurization and denitrification equipment is a key environmental protection device used to control the emissions of sulfur dioxide (SO₂) and nitrogen oxides (NOₓ) generated during the lime kiln production process. Its technical solution must be tailored to the process characteristics of the lime kiln, flue gas composition, and emission standards. The following are the main equipment types and technical points:

     I. Desulfurization Equipment

1. Wet Desulfurization System
   • Process Principle: Uses alkaline absorbents (such as limestone-gypsum method or ammonia method) to react with SO₂ in the flue gas, forming sulfates or sulfites.
   • Equipment Composition: Absorption tower, slurry circulation pump, oxidation fan, mist eliminator, gypsum dewatering system, etc.
   • Advantages: High desulfurization efficiency (over 90%), suitable for large-capacity flue gas treatment.
   • Applicable Scenarios: Suitable for regions with strict SO₂ emission requirements.
2. Dry/Semi-Dry Desulfurization System
   • Process Principle: Injects dry powder absorbents (such as sodium bicarbonate or hydrated lime) or atomized slurry to react with SO₂ in a dry state.
   • Equipment Composition: Reactor, powder injection device, bag filter, etc.
   • Advantages: No wastewater discharge, simple system, lower investment cost.
   • Applicable Scenarios: Suitable for areas with limited water resources or lower requirements for byproduct treatment.
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II. Denitrification Equipment

1. Selective Catalytic Reduction (SCR) System
   • Process Principle: Injects ammonia water or urea in the presence of a catalyst to reduce NOₓ into nitrogen and water.
   • Equipment Composition: SCR reactor, catalyst layers, ammonia injection system, flue gas heating device (if flue gas temperature is insufficient), etc.
   • Advantages: High denitrification efficiency (over 90%), mature technology.
   • Applicable Scenarios: Suitable for regions with strict NOₓ emission requirements, especially for large lime kilns.
2. Selective Non-Catalytic Reduction (SNCR) System
   • Process Principle: Directly injects reducing agents in the high-temperature zone (850-1100°C) without a catalyst.
   • Equipment Composition: Reducing agent storage and injection device, control system, etc.
   • Advantages: Low investment, simple system.
   • Applicable Scenarios: Suitable for small to medium-sized lime kilns or scenarios with lower NOₓ emission requirements.
3. Low-Temperature Denitrification Technology
   • Process Principle: Developed for the low-temperature flue gas characteristics of lime kilns, using low-temperature catalysts (such as manganese-based catalysts) to achieve efficient denitrification at 150-250°C.
   • Equipment Composition: Low-temperature SCR reactor, heating device (such as heat exchanger or burner), etc.
   • Advantages: Adapts to low-temperature flue gas in lime kilns, reduces energy consumption.
   • Applicable Scenarios: Suitable for lime kilns with low flue gas temperatures.