The Model 496 NFPA rated Gravimetric feeder is designed to meet your needs when feeding a pulverizer. It is designed with the operator in mind to give years of trouble free operation.
Merrick's experience in the power industry and world-class expertise in electronic control systems have enabled us to design a truly unique coal feeder.
The Model 496 is specifically designed for:
- Performance – The Model 496 is engineered to provide cost effective operation at unparalleled accuracy of ± 0.25%
- Reliability – Merrick feeders are designed and manufactured under the strictest guidelines using only the highest quality materials and components to maximize uptime.
- Safety – Safety is always the top priority at Merrick. The Model 496 is tested to 100 psi, 2x the NFPA 85 criteria. Additionally, all internal electronics are either explosion-proof or intrinsically safe.
Body Shell and Feeder Construction
- Rugged weldment with 1/4” thick carbon steel shell for longer life
- 50 psi pressure integrity (NFPA 85)
- 304 stainless steel in active flow areas to minimize corrosion
- Large gasketed end and side access doors to facilitate easy feeder entry
- Fixed leveling bar to maintain a constant material profile
- Standard feeder inlet configurations:
- 18” diameter for a 24” belt feeder
- 24” diameter for a 36” belt feeder
- 36” diameter for a 48” belt
Clean-out Conveyor
- Drag chain type conveyor thoroughly sweeps the floor of the feeder into the discharge chute to minimize coal and dust build-up.
- The clean-out chain can be controlled in one of two different modes, either continuously or intermittently
- The clean-out conveyor is driven by an AC motor with an integral high efficiency off-the-shelf gear reducer
Conveyor Drive
- The main conveyor drive is driven by an AC TENV motor with a VFD speed control
- The direct drive, off-the-shelf high efficiency gear reducer is standard
- A chain drive is optional
Bearings
- Externally regreasable head and tail pulley bearings for extended life
- All idler rolls greased and sealed for life
Weigh Suspension System
- Dual hermetically sealed and barometrically compensated load cells
- Simple to align, reducing maintenance costs
- Calibration test weights
Slack Belt/Positive Wrap Pulley
- Use of large pulleys provides positive belt wrapping thereby eliminating the need for high tension on both sides of the belt
- Longer belt and bearing life due to lower belt tension
- Higher accuracy from reduced belt error
Belt Scrapers
- Two belt scrapers are used-one at the head pulley to clean the outside of the belt and the other, a V-plow scraper, to clean and disburse material from the inside of the belt
- Scraper blades are made of a special, abrasion resistant material
Controls
- Advanced MERRICK Genetix process controller is standard
- Local mounting is standard for ease of operation
- Touch screen interface
- Optional dual encoders (drive motor and tail pulley) to detect belt slipping or breakage
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