Flue Gas Desulfurization That Helps Remove Sulfur Compounds

Understanding Flue Gas Desulfurization (FGD): A Simple Guide

Flue Gas Desulfurization, commonly known as FGD, is a popular methodology to remove sulfur dioxide (SO 2) from a flue gas (exhaust gas) stream. FGD has become increasingly popular in recent years because it is an excellent technology to remove sulfur compounds from the flue gas produced by furnaces, boilers, and other relevant sources.

This article explores valuable information on Flue Gas Desulfurization (FGD), such as what is the Flue Gas Desulfurization (FGD), the types of FGD, and more. If you’re keen on learning about Flue Gas Desulfurization (FGD), please read this article carefully.

What is the Flue Gas Desulfurization (FGD)?

It’s crucial to understand the correct meaning of Flue Gas Desulfurization (FGD) for general informational purposes. Below are the right means of the Flue Gas Desulfurization (FGD).

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Flue Gas Desulfurization is a modern methodology designed to remove sulfur compounds from a flue gas (exhaust gas) stream. This process is an excellent method for reducing sulfur compound emissions from coal combustion boilers. Start an online search to learn about Flue Gas Desulfurization.

The Types of Flue Gas Desulfurization (FGD)

When we talk about the types of flue gas desulfurization (FGD), there are two types of FGD – Once-through processes and regenerable processes. The FGD process can be separated into these categories.

Once-through processes

A once-through process is the most common method to remove sulfur dioxide (SO2) from the exhaust emissions of fossil-fueled power plants. It is a non-refrigerated system that utilizes the sorbent as a beneficial by-product. Also, it disposes of it as waste

Regenerable processes

Regenerable processes are flue gas desulfurization processes. Generally, this process releases the sorbed sulfur dioxide to produce other compounds like elemental S, H2SO4, or liquid SO2.

Why Is Flue Gas Desulfurization (FGD) Important?

We know that sulfur dioxide (SO2), a harmful air pollutant, has several negative consequences, which include;

Respiratory Issues

Sulfur dioxide (SO2) exposure irritates the human lungs, leading to respiratory disorders such as bronchitis, asthma, and other issues. FGD systems help us protect against asthma and bronchitis.

Acid Rain

Acid rain is another reason why FGD is important. When sulfur dioxide (SO2) reacts with moisture in the atmosphere, it forms sulphuric acid, a key component of acid rain. Typically, acid rain damages forests, ecosystems, buildings, and others.

Flue Gas Desulfurization (FGD)  systems play a crucial role in mitigating acid rain and respiratory issues by capturing sulfur dioxide (SO2) before it escapes into the atmosphere.

Treating Flue Gas Desulfurization

Here, we talk about how to treat flue gas desulfurization. Here are a few steps of FGD Wastewater Treatment.

pH Elevation / Metal and Gypsum Desaturation

This is the first step in treating FGD wastewater. You know that desaturating the stream of metals and gypsum is a crucial step to prevent scaling on equipment. Meanwhile, the pH of the wastewater stream is raised to ranging 8 to 10 using Ca(OH)2 (calcium hydroxide) or NaOH (sodium hydroxide).

Heavy Metal Removal

This is another step in treating FGD wastewater. In this process, some heavy metals are removed as hydroxides as pH is raised.

Apart from this, there are a few steps to treat FDG wastewater.

  • Coagulation / Polymer / pH Adjustment
  • Solids Dewatering

How To Choose The Right FGD System?

When it comes to choosing the right FGD system, there are a few things to consider before making an informed decision. Here are a few things that you should know before buying.

  • Required SO2 removal efficiency
  • Waste disposal options
  • Availability of water
  • Cost considerations

What Are the Environmental Impacts of FGD?

FGD systems also have environmental impacts, while they greatly reduce sulfur dioxide (SO2) emissions. Here are some of the most common environmental implications of FGD.

Waste Disposal

We also know that wet and dry systems generate waste disposal that requires proper management to avoid environmental contamination.

Energy Consumption

FGD systems also help add to the overall power plant energy consumption.

Water Usage

Wet scrubbers consume water, which can be a problem in water-scarce regions.

In Conclusion:

Flue Gas Desulfurization (FGD) is vital for removing sulfur from plant flue gases. This process is done after the combustion process to meet environmental requirements. For this reason, flue gas desulfurization is commonly used to control emissions of sulfur compounds from power stations that burn coal with high sulfur content.

Understanding the FGD systems types, their working principles, and their environmental considerations can be daunting for making an informed decision regarding air pollution control strategies.

This is a guide to flue gas desulfurization (FGD). It’s advisable to thoroughly examine all critical details of the flue gas desulfurization to make an informed decision. Start an online search to understand more.


Steps of FGD Wastewater Treatment