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Pollution & Emission Control

Sorbent Technologies

Dry Sorbent Injection (DSI) Emissions Control

DSI – Sorbent Pollutant Removal from Flue Gas


The Situation

  • US EPA emissions standards for application of maximum achievable control technology (MACT), internationally referred to as “best available control technology” (BACT), are finalized as Mercury and Air Toxics Standards (MATS), which is applicable to utilities.  
  • MATS emissions limits for HCl is 0.0020 lbs/MMBtu (3.2 mg/Nm3). MATS limit for SO2 is 0.20 lbs/MMBtu (297 mg/Nm3). Compliance with MATS requires meeting either the HCI or SO2 emissions limits (SO2 is a surrogate measure of HCI)
  • EPA MACT regulation also establishes emission standards for control of hazardous air pollutants (HAP) from industrial/commercial boilers and process heaters (“Boiler MACT”). Boiler MACT regulation is pending. 
  • Dry Sorbent Injection (DSI) is a proven cost-effective methodology to meet MATS and International BACT compliance standards for HCI and toxic non-mercury metals, and “Boiler MACT” HAP compliance standards as presently promulgated.


Size Reduction Sorbent Milling Systems are at the heart of DSI Technologies. DSI performance is largely driven by the milled surface size of the sorbent material (sodium bicarbonate, trona, hydrated lime, powdered activated carbon) where the injected sorbent/reactant creates adherence (capture) of pollutant gases. Increasing surface size on a steep distribution curve at high volume thru-put is the challenge for milling technologies.


CMS’s Significant Role

In response to MATS and MACT regulation, CMS offers a range of Sorbent Mill Systems that meet the more rigorous particle size distribution requirements of DSI. CMS has engineered, manufactured and installed commercial scale sorbent milling systems for trona and sodium bicarbonate, which currently operate in compliance of MATS and MACT regulation. CMS also designs milling systems for PAC


The Owensboro Riverport Authority DSI Project

CMS was recently contracted by Solvay Chemicals Solvay Chemicals to design, engineer, build and install the turnkey (inbound/outbound) Harbour Road Terminal SBC Process Facility at Owensboro Riverport for processing and supplying Solvay’s bicarbonate SOLVAir® SBC product to a regional base-load coal fired facility.  The first of four planned CMS 300HP Sorbent Milling lines are installed and operating. Three additional milling lines are scheduled for completion in early 4Q 2015.