Flue Gas Desulfurization and DeNOx Equipment

Flue Gas Desulfurization and DeNOx Equipment is used to reduce sulfur oxides and nitrogen oxides in industrial flue gas. The system combines sulfur dioxide removal and nitrogen oxide reduction processes within a flue gas treatment arrangement.

Flue gas first passes through the gas conditioning and distribution section before entering the desulfurization stage. Depending on the process configuration, an alkaline absorbent or slurry is brought into contact with the gas. Sulfur dioxide is transferred from the gas phase into the liquid or solid absorbent through absorption and chemical reaction.

The gas then enters the DeNOx section when nitrogen oxide reduction is required. Selective catalytic reduction or selective non-catalytic reduction processes may be used according to the gas temperature and system design. In these processes, a reducing agent reacts with nitrogen oxides and converts them primarily into nitrogen and water.

The equipment can include gas ducts, absorbers, reagent preparation units, spray systems, reaction chambers, catalysts or injection devices, demisters, fans, pumps, and control instruments. The exact arrangement depends on flue gas volume, temperature, pollutant concentration, reagent characteristics, and required emission conditions.

Dust removal can be installed upstream or integrated into the overall flue gas treatment line to reduce particulate loading on downstream components. Heat recovery and gas reheating sections may also be incorporated where required by the process.

Main Components

• Flue gas inlet

• Gas distribution section

• Desulfurization absorber

• Absorbent circulation system

• Reagent preparation unit

• DeNOx reactor or injection system

• Catalyst or reducing-agent injection equipment

• Demister

• Induced draft fan

• Control and monitoring system

Treatment Process

1. Flue gas enters the treatment system.

2. Gas is distributed and conditioned.

3. SO₂ is removed through an absorption or reaction process.

4. Nitrogen oxides are treated through a suitable DeNOx process.

5. Liquid droplets are removed by the demister where applicable.

6. Treated gas passes through the outlet duct.

Applications

• Power plant flue gas treatment

• Cement kiln exhaust

• Steel and metallurgical processes

• Industrial boilers

• Waste incineration

• Chemical process flue gas

• Mineral processing

• Industrial combustion exhaust