Introduction
The document discusses the Keppel Seghers' Semi-Dry Scrubbing System, designed to clean flue gas generated from the combustion of solid wastes such as municipal or industrial waste and RDF. The system aims to remove pollutants like acid components, dust, heavy metals, nitrogen oxides, and polyaromatic compounds to comply with stringent emission regulations.

Principle
The system operates by mixing flue gas with lime milk in a reactor and injecting activated carbon at the fabric filter inlet. This process captures pollutants through neutralization and absorption, resulting in solid residues that are filtered out.

Applications

• Uses lime milk made from slaked or unslaked lime.
• Operates with inlet flue gas temperatures of 175-185°C.
• Handles flow ranges from 10,000 to 200,000 Nm3/h.
• Maintains dust load below 10 g/Nm3.
• Achieves high removal efficiency: >99% for HCl and >85% for SOx.

Process Description
The process involves cooling flue gas and removing harmful components in a reactor using finely atomized lime milk. Heavy metals are partially absorbed on dust particles, with most residues captured in a bag filter. Activated carbon is injected to absorb additional pollutants, with residues transported to silos.

Features

• Custom installation design based on waste characteristics.
• Optimal conditions for neutralization reactions.
• Use of Keppel Seghers ROTARY ATOMISER for fine droplet production.
• Direct drive system for reliability and low maintenance.
• Compact design with low noise and minimal plume formation.
• Option to combine with dry lime or sodium bicarbonate injection for flexibility.