Dry sorbent injection is a gas treatment process in which dry powdered reagents are introduced into a flue gas stream to assist in the removal of acid gases, dioxins, and other pollutants before discharge to atmosphere. Effective operation requires a downstream particulate capture stage, and hot gas filtration systems play an important role in removing reacted and unreacted sorbent from the gas stream.
Glosfume hot gas filtration systems are designed for high-temperature dry filtration applications where reliable particulate removal is required. Glosfume references dry scrubbing processes involving sodium bicarbonate and activated carbon injection for the removal of acid gases and dioxins from industrial gas streams.
What is Dry Sorbent Injection?
Dry sorbent injection (DSI) is a dry gas cleaning process in which powdered reagents are introduced into a flue gas stream prior to filtration. The reagents react with pollutants within the gas stream before being captured by the downstream filter system.
Glosfume references sodium bicarbonate injection and activated carbon injection as part of dry scrubbing processes used for acid gas and dioxin removal. Following injection, reacted and unreacted material is removed by the filtration stage as a dry residue.
How Dry Sorbent Injection Works
In a dry sorbent injection process, powdered reagent is introduced into the gas stream upstream of the filtration system. As the gas passes through the process, the reagent reacts with pollutants present within the flue gas.
The downstream filtration stage captures both reacted and unreacted material, preventing particulate release to atmosphere. During operation, material accumulates on the filter surface and is periodically removed during cleaning cycles as a dry collected residue.
Further information is available on combining ceramic filters with dry scrubbing.
Sorbents Used in DSI Systems
Sodium Bicarbonate
Glosfume references sodium bicarbonate injection as part of dry scrubbing systems used for acid gas removal. Sodium bicarbonate is used in dry gas treatment processes where particulate and acid gas control are required.
Activated Carbon
Glosfume also references activated carbon injection for dioxin removal applications. Activated carbon is introduced into the gas stream and removed downstream by the filtration system together with collected particulate.
The Role of Hot Gas Filtration in DSI Systems
The filtration stage is an essential part of any dry sorbent injection process. Without downstream filtration, reacted sorbent and fine particulate would remain within the gas stream.
Glosfume hot gas filtration systems are designed for dry, high-temperature particulate removal applications. Glosfume states that ceramic filter media can withstand temperatures up to 1000°C and are non-flammable, making them suitable for demanding process conditions where conventional bag-type filters may fail at elevated temperatures.
Glosfume systems are designed to operate with dry scrubbing processes involving sodium bicarbonate and activated carbon injection. Performance is influenced by process conditions, particulate loading, and overall system design.
Further information is available on sorbent compatibility and ceramic filter elements.
Where DSI and Ceramic Filtration are Used Together
Dry sorbent injection and ceramic filtration are applied in industrial processes where high-temperature gas cleaning and particulate control are required.
Energy-from-Waste
In energy-from-waste applications, dry scrubbing processes are used for acid gas and dioxin removal, with downstream filtration systems capturing particulate and injected material.
Biomass Combustion
Glosfume references biomass applications where high-temperature particulate emissions require efficient filtration. Dry gas cleaning processes may be applied where acid gas control is also required.
Industrial Process Gas Treatment
Industrial gas treatment processes involving elevated temperatures and particulate emissions may combine dry sorbent injection with ceramic hot gas filtration systems for dry particulate and pollutant control.
Specifying a DSI-Compatible Filtration System
The downstream filtration system plays a central role in dry sorbent injection performance. Filtration specification influences particulate capture, pressure drop behaviour, and long-term operating stability.
Process temperature, particulate loading, reagent behaviour, and gas composition all affect filtration performance. Correct coordination between the dry scrubbing process and the filtration system is therefore important.
Further guidance is available on specifying filters for DSI systems.
Frequently Asked Questions
What is the difference between dry sorbent injection and wet scrubbing?
Dry sorbent injection uses dry powdered reagents introduced into the gas stream, while wet scrubbing uses liquid-based treatment systems. Dry processes avoid the generation of liquid waste streams and are commonly used in high-temperature gas treatment applications.
What sorbents are compatible with ceramic hot gas filters?
Glosfume references sodium bicarbonate and activated carbon injection in conjunction with dry scrubbing and ceramic hot gas filtration systems. System compatibility depends on process conditions and overall filtration design.
At what temperatures does dry sorbent injection work?
Glosfume does not specify standard operating temperatures for dry sorbent injection processes. However, it states that ceramic filter media can withstand temperatures up to 1000°C in high-temperature filtration applications.
Why is sorbent compatibility with the filter important?
Sorbent behaviour affects particulate loading and filtration performance within the downstream filter system. Stable filtration performance depends on correct coordination between the dry scrubbing process and the filtration stage.
Talk to Glosfume About DSI and Filtration System Design
If you are specifying a dry sorbent injection process and require a filtration system suitable for high-temperature operation, Glosfume can assist with downstream hot gas filtration system design and filter media selection.
Glosfume states that the company had completed more than 1000 installations worldwide across a range of high-temperature filtration applications.
To discuss your application, visit the contact page.
