Weyerhaeuser

Weyerhaeuser

Michigan Sugar

947 Pine Street

Sebewaing, MI 48759

Challenge:

 

Integrate a new Wet Electrostatic Precipitator behind a 1974 vintage coal fired boiler in order to control emissions to below MACT standards.

 

Scope of Work:

 

Southern Environmental, Inc. (SEI) designed an up-flow configured Wet Electrostatic Precipitator (WESP) system consisting of two independently energized chambers in one module, with a single electrical field in the direction of gas flow.  All metal parts touching the gas stream were constructed with 2205 stainless steel.  The new WESP design utilized the SEI patented membrane technology which minimized weight, cost and water consumption.

 

Project Duration:

 

 PO Received:   11/26/14

 Materials on site:  7/5/2015

 Start up:  8/2015

 

Detailed Engineering in the following disciplines:

 

Structural

Mechanical

Electrical and controls integration

1/12 Physical Scale Model Study

Civil

Controls

 

Fabrication and Installation Services:

 

WESP Fabrication and Installation

Field Technical Support and Start Up

Access Fabrication and Installation

Electrical Installation

Civil Construction

Ductwork Fabrication and Installation

Project Management

Structural Steel Fabrication and  Installation

 

Southern Environmental’s Solution:

 

Southern Environmental, Inc. provided a turnkey solution to engineer, supply and install a complete Wet ESP solution to ensure Michigan Sugar’s compliance with the MACT regulations and requirements. This unit is an up-flow configured Wet Electrostatic Precipitator (WESP) system consisting of two independently energized chambers in one module, with a single electrical field in the direction of gas flow.  It was concluded that placing a WESP downstream of the existing wet scrubber would be the most technically and economically suitable solution for this plant.  The up-flow design, by its inherent nature of being an excellent mist-eliminator, is a better configuration than the down-flow. The downflow configuration requires a mist-eliminator which is prone to plugging.  The collecting electrodes are made out of felted polypropylene material which is irrigated continuously and uniformly with water.  This continuous wetting minimizes the particulate build-up, down time due to intermittent flushing, and deposits of concentrated corrosives on dry areas.  The dual chambers allow for one half of the WESP to remain in operation all the time thus increasing the reliability and uptime.  SEI provided complete integration of the control, power and water systems as well as ducting and civil and foundation modifications in order to provide the most viable solution for Michigan Sugar.

 

 Application / Operating Conditions:

 

Heat Input                                                                 120-150 MMBtu/hr

Maximum saturated flue gas volume at Outlet         85,000 ACFM

Flue Gas Temp at Scrubber Outlet                           135-150 °F

Maximum Flue Gas Pressure                                   +5 WC

Max particulate loading at Wet Scrubber Outlet        0.176 lb/MMBtu

 

Performance Guarantee:

 

With the boilers operating at or below the levels noted above, SEI guarantees that the filterable PM loading out of the new WESP system will not exceed 0.04 lbs/MMBtu.  The outlet filtrable PM at time of performance testing was 0.0237 lbs/MMBtu.

 

 

Corporate Headquarters:  6690 West Nine Mile Road, Pensacola, FL  32526   850-944-4475   apcsales@sei-group.com

Fabric Filter Engineering Office: 921 Eastwind Drive, Suite 115, Westerville, OH 43081   614-259-6505