Power Plant Flue Gas Desulfurization Case Study

Slurring pulverized limestone for FGD at a rate in excess of 1000#/minute.

The Project

Many of our power customers have installed state-of-the-art limestone storage and slurry process for FGD in their plants, incorporating two silos for pulverized limestone storage and the VACUCAM® Ejector Mixer process for slurring pulverized limestone for FGD.

Location: Indiana
Industry: Power Generation

Our Approach

To meet the capacity requirements and the logistics of these facilities, our process included two silos, each with a dual cone outlet. A modular skidded dual mixer system was installed below each silo and above the slurry storage tank. Each in-line single pass process receives 250gpm process water to the individual mixers and delivers 300gpm of 30%+ limestone slurry into the top of the slurry storage tanks feeding the scrubber.

A smaller footprint.

The modular skidded unit has a small foot print and is installed on the top of the slurry tank. The system is designed to be operated one mixer at a time with a redundant mixer on standby for each silo. Limestone is constantly delivered from the fluidized silo cone into the fluidized surge pot. Water is delivered from the water supply to the Ejector mixer. The Mixer generates a powerful vacuum and conveys the limestone through a convey hose at a rate in excess of 1000#/minute for each mixer.

The Results

Slurring pulverized limestone for FGD at a rate in excess of 1000#/minute.

The 30%+ slurry is delivered from the slurry discharge of the mixer into the top of the slurry storage tank. During factory acceptance testing, we demonstrate a limestone convey and mix rate of 1500#/minute per mixer for a single mixer
system. The system also demonstrates total dispersion and slurry quality with zero evidence of dusting in the operating area.