The presence of LPA poses a serious threat when it is carried over into the SCR reactor where it frequently causes catalyst pluggage which leads to:

Catalyst may need to be removed from the reactor and cleaned which can result in a forced outage, increased O&M costs, and the loss of revenue.

Since 1996, Evonik Steag’s proprietary and patented LPA screens have effectively removed LPA from the flue gas before it reached the SCR. The  pleated design, with hinged screens and a modular design of screen inlays, allows for a variety of screen materials, either coated or uncoated, to be used. Typically, such LPA screens are installed at the boiler’s economizer outlet utilizing the economizer hopper for the continuous extraction of the removed LPA.

Our LPA screen services include:

• Detailed design and engineering
• Material procurement and fabrication and pre-assembly
• On-site construction and installation supervision
• Support during start-up and commissioning of screen  initial operation

The pleated design reduces the force of ash particles as it hits the screen, minimizes the erosion, and extends the life of the screens.	The hinged design allows the screens to move, hitting against the stopper for self-cleaning. Rappers can be used for fully automated cleaning	Our support screen on the downstream side increases the stability of the wire mesh screens thereby extending its life cycle.