Jeffrey Rader - Mechanical Boiler Feed Systems
From Biomass Energy
Mechanical Boiler Feed systems for feeding biomass and alternative fuels, including woody biomass, agricultural or refuse derived fuels into boilers and kilns. Jeffrey Rader Boiler Fuel feed Systems are made up of a combination of storage, reclaim, conveying and feeding equipment. Jeffrey Rader works closely with the customer to ensure that the feed systems are designed to meet the storage, metering and feed rate requirements of the boiler, whether it’s feeding 100% biomass or co-firing biomass with coal. Jeffrey Rader Systems are in operation today at fuel feed rates of 3 to over 200 tons per hour.
Typical equipment can include:
Typical equipment can include:
- Boiler Front Day Bins, Silos and Hoppers
- Distribution Screws and Conveyors
- Metering Screws
- Robbing Screws
- Expansion Joints
- Isolation Valves
- Feed Chutes
- Rotary Airlocks Feeders
- Fine Grinding Systems for PF Boilers
- Gravimetric and Volumetric Feed Controls
Depending on the boiler fuel specifications and design criteria, our system of equipment can be customized to achieve the objectives of the project. Inherent in the designs of Jeffrey Rader Boiler Feed Systems are the capabilities and ability of the system to react quickly to changes in fuel demand.
Jeffrey Rader can offer systems for the following types of Utility or Industrial Boilers and Kilns:
- Moving Floor, Stoker or Grate Fired Boilers
- Circulating Fluidized Bed Boilers (CFB)
- Bubbling Fluidized Bed Boilers (BFB)
- Cyclone Boilers
- Cement or Lime Kiln Pre-Calciners
- Thermal Gasifiers
Fuel Storage, Distribution and Metering
The typical boiler or kiln feed system will include fuel storage, distribution and metering to the required number of feed points on the boiler or kiln.
Fuel Storage prior to injection is typically provided with Day Bins (silos, bunkers or bins near the face of the boiler). Day Bins can be circular screw reclaimers in the bottom of silos, full live bottom screws, stokers or chains. Fuel from the Day Bins can be discharged directly into the boiler feed spout or to a metering screw conveyor for feeding to a single boiler feed point for mechanical or pneumatic injection.
Distribution to multiple feed points can be accomplished with distribution conveyors (screw or chain), robbing screws and metering feed screws. A sophisticated control system utilizing level controls, variable frequency drives and in some cases gravimetric feeders works in concert with the boiler house DCS to optimize the distribution and delivery of fuel to the boiler feed point.
Mechanical Injection Systems
Jeffrey Rader mechanical systems are typically used on CFB, BFB and moving floor or grate type boilers where larger material sizes at higher moisture contents can be utilized and where firing in suspension is not required.
Fuel Received from the fuel distribution and metering system is generally discharged to the boiler feed chute by a rotary air lock or 100% filled metering screw. Generally a system of isolation valves and expansion joints along with pressure and temperature indicators are provided for at this point near the face of the boiler.
Jeffrey Rader recommends the use of rotary airlock feeders for isolation of up-stream equipment from the boiler.
Jeffrey Rader Rotary Airlocks have been used in many severe duty applications and can be ATEX certified for dusty environments and can also be supplied as Autonomous Protection Devices (APS) for up to 13 bar pressure events.
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