DSI is an effective Route for SO₃, SO₂, and HCl reduction - Hot Topic Hour Conclusions

Direct sorbent injection was the topic of the Hot Topic Hour on April 9.

Sterling Gray of AECOM cited the following features for SBS injection:

• Injection of “Sodium-Based Solution”
• Produces very small reactive sorbent particulate
• Achieves uniform dispersion and mixing of sorbent
• Captures nearly all SO₃ prior to APH
• Allows operation of APH at lower temperatures
• Improves unit efficiency and reduces fuel costs
• Captures HCl and Se to lesser extent.

Other Co-Benefits

• Reduced CO₂ Emissions

o   Higher unit energy efficiency 

• Enhanced Mercury Capture

o   Greater carbon absorption capacity

o   Less SO₃ interference

• Enhanced ESP Performance

o   Lower gas volumetric flow (higher SCA)

o   Lower ash resistivity (temp and SO₃ effect)

• Reduced Fan Aux Power Consumption
  • Reduced gas flow and gas path pressure drop
• Reduced WFGD Water Consumption
  • Cooler inlet flue gas temp
• Reduced Unit Derates

o   Higher PA temp and greater fan margin

The SBS is very effective in reducing SO₃ and, as shown in the figure below, it more than compensates for the increased SO₃ created by the SCR catalyst.

SBS Injection Technology and Benefits by Sterling Gray, AECOM - Hot Topic Hour April 9, 2015.

Features for SBS Injection

Revision Date:  4/10/2015

Tags:  221112 - Fossil Fuel 化石燃料, AECOM, Sodium Bisulfate, SO3

Shuman Moore of ClearChem asserted that very fine powdered limestone is an attractive alternative to other sorbents.  It is injected with the fuel.  Because of its small size it quickly reacts with the SO₂. It can boost the efficiency of existing scrubbers or be used as an alternative. Cost comparisons were made for a 300 MW unit.

Enabling New Operational Efficiencies by Controlling Emissions from Coal Plants effectively and inexpensively by Shuman Moore, ClearChem - Hot Topic Hour April 9, 2015

Shuman asserted that very fine powdered limestone is an attractive alternative to other sorbents.

Revision Date:  4/10/2015

Tags:  221112 - Fossil Fuel 化石燃料, ClearChem Development LLC, Limestone, Lime, SO2

Shuman asserted that very fine powdered limestone is an attractive alternative to other sorbents.

Revision Date:  4/10/2015

Tags:  221112 - Fossil Fuel 化石燃料, ClearChem Development LLC, Limestone, Lime, SO2

Martin Dillon of Lhoist explained how a high surface area hydrated lime, Sorbocal^® SP, is able to achieve HCl removal close to 80 percent.

Dry Sorbent Injection Options and Issues - Sorbacal HCl Removal by Marty Dillon, Lhoist North America - Hot Topic Hour April 9, 2015

Martin Dillon of Lhoist explained how a high surface area hydrated lime, Sorbocal® SP, is able to achieve HCl removal close to 80 percent.

Revision Date:  4/10/2015

Tags:  221112 - Fossil Fuel 化石燃料, Lhoist North America, Lime, HCl, SO2, SO3

Curt Biehn of Mississippi Lime analyzed results from extensive testing to show the attractive economics for using an improved hydrated lime (HR) to remove HCl.

The Benefits of High Reactivity Hydrated Lime for Air Pollution Control by Curt Biehn, Mississippi Lime - Hot Topic Hour April 9, 2015

Curt analyzed results from extensive testing to show the attractive economics for using an improved hydrated lime (HR) to remove HCl.

Revision Date:  4/9/2015

Tags:  221112 - Fossil Fuel 化石燃料, Mississippi Lime, Lime, HCl, SO2, SO3

Guisu Liu of Mobotec explained how with CFD modeling the quantity of sorbent can be minimized. Sorbent options include multiple types and multiple injection points. Mixing is important.

Advanced Chemistry Modeling for SO2, SO3 and HCl Removal by Dry Sorbent Injection by Guisu Liu, Mobotec - Hot Topic Hour April 9, 2015

Guisu explained how with CFD modeling the quantity of sorbent can be minimized.

Revision Date:  4/9/2015

Tags:  221112 - Fossil Fuel 化石燃料, Mobotec (USA), Lime, Sodium, CFD, SO2

Dry Sorbent Injection Options and Issues Webinar Recording - Hot Topic Hour April 9, 2015

DSI is an effective Route for SO3, SO2, and HCl reduction.

Revision Date:  4/10/2015

Tags:  221112 - Fossil Fuel 化石燃料, Lhoist North America, AECOM, ClearChem Development LLC, Mississippi Lime, Mobotec (USA), Lime, Sodium Bisulfate, Limestone, Sodium, HCl, SO2, SO3, CFD