Air Pollution Control System

Summary

An effective air pollution control system for the atmospheric emissions from industrial combustion sources and waste gas from chemical process is essential because of stringent environmental regulations.
Pollutants emitted from industrial combustion sources and waste gas from chemical process can include particulate matter (PM), nitrogen oxides (NOx), sulfur oxides (SOx), carbon monoxide (CO), volatile organic compounds (VOCs), and other compounds like HAPs (Hazardous Air Pollutants) which includes hydrogen chloride and hydrogen fluorides (HCl and HF).
For the reduction of pollutant emission, air pollution control systems and technologies shall be selected based on the emitted pollutant.

Features

Thermal Oxidizer

Typically, thermal oxidizer is used to remove volatile organic compounds (VOCs) and hazardous air pollutants (HAPs) which is hydrocarbon basis. VOCs and HAPs are removed and oxidized to H2O and CO2 through thermal combustion. There are several technologies for thermal oxidizer as follow.

1) Direct Fired Thermal Oxidizer
2) Regenerative Thermal Oxidizer (RTO)
3) Thermal Recuperative Oxidizer

Catalytic Oxidizer

Catalytic oxidizer is similar to the thermal oxidizer, but is uses a catalyst to promote the oxidation of VOCs and HAPs by chemical reaction. A catalyst accelerates the chemical reaction in the temperature range of 340~540 deg.C. There are several technologies for catalyst oxidizer as follow.

1) Regenerative Catalytic Oxidizer.
2) Recuperative Catalytic Oxidizer.

Desulfurization System (SOx Removal)

Desulfurization system is a technology for removal of sulfur dioxide (SO2) from exhaust gas from fossil fuel combustion and emission of chemical process to meet the stringent environmental regulation.

Mainly, there are several technologies to remove SO2 as follow.
1) Dry and Semidry Sorbent Injection
2) Wet Scrubbing

DENOx System

DeNOx system is a technology for removal of nitrogen dioxide (NO2) from exhaust gas from fossil fuel combustion and emission of chemical process to meet the stringent environmental regulation.

Mainly, there are technologies to remove NO2 as follow.
1) Selective Catalytic Reduction (SCR)
2) Selective Non-Catalytic Reduction (SNCR)
3) Hybrid (SNCR+SCR)

Electrostatic Precipitator

Electrostatic precipitator captures the fine dust and particulate matters from the exhaust gas of combustion and emission gas in chemical process using the induced electrostatic charge.