Pneumatic Boiler Feed Systems
High Pressure, Low Pressure and Vacuum Conveying Systems for Pulp & Paper Mills or Biomass Systems and for Boiler Direct Injection Systems.
Efficiently move chips, bark, and RDF bulk material over a long distance, elevate it in a short distance, or inject woody material directly into a boiler.
Pneumatic conveying rates of more than 1000 tons per hour can be achieved with these systems. Jeffrey Rader designs ruggedly built rotary valves, cyclones, wear back elbows, ducting and blowers for tough, high-pressure, high-volume and abrasive pneumatic conveying applications.
With more than 50 years of experience and 10,000 installations in pulp and paper mills around the world, Jeffrey Rader has the application knowledge to design and build your pneumatic conveying systems.
Boiler Fuel Feed Systems
Jeffrey Rader Boiler Fuel Feed Systems are typically made up of a combination of metering and conveying equipment such as underpile screw reclaimers, drag chain conveyors, screw conveyors, robbing screws, slide gate valves and rotary airlock/feeders.
Depending upon the desired flow rate to the boiler, this system of equipment can be speed controlled faster or slower to obtain that desired flow rate.
Because this type of boiler fuel feed system is made of a collection of conventional and standard pieces of conveying equipment it has the benefit of many years of industry experience with reliability of those types of equipment.
Digester Charging System
The Jeffrey Rader digester charging system converts the classic batch cooking process into a Continuously Operated Digester. A digester installation eliminates disadvantages such as excessive labor costs. One operator can operate and control the various functions of the charging system from a control room.
Automation is another benefit since the system can easily be remote controlled or fully automated utilizing simple mechanical or electro/hydraulic components. This provides a controled and uniform management system.
The Jeffrey Rader Digester Charging System provides uniform pulp quality. Pre-heating, preimpregnation, liquor-impregnation and circulation are all elements that also add to the uniform pulp quality. The Digester Charging System is completely enclosed from the infeed to the point of discharge into the digester. Conveying air is separated in the cyclone and evacuated to atmosphere.
The air evacuation system operated during the chip filling prevents the air and incondensible gasses from disturbing the chip flow pattern.
As an additional benefit of this system, all the digester gasses containing mercaptans and other toxic components which otherwise escape to the atmosphere, are collected and can be blown to the recovery boiler or other air pollution control device.
Components & Equipment
Airlock Feeders
Jeffrey Rader rotary airlock feeders are considered to be the best in the industry. We stock a compete line of high quality new and OEM rebuilt rotary airlock feeders available for immediate shipment. Rebuilt feeders, which are reconditioned to our stringent design standards, offer significant cost savings.
Mark III Elbows
The Jeffrey Rader Mark III Elbow for pneumatic conveyor applications reduces wear, lowers energy consumption and helps eliminate fiber damage. The Mark III flat back elbow is specially designed to reduce energy consumption, reduce wear and help eliminate fiber damage. Material moves smoothly through the elbow without bouncing. First at the impact area, then guided as it changes direction and discharges at the center of the downstream pipe where air velocity is maximum.
Model E Cyclone
The Jeffrey Rader Model “E” Cyclone provides a highly efficient discharge device for pneumatic transport systems working well for a variety of fibrous materials including chips, bagasse and bark. The specially designed inlet impact section minimizes material damage and eliminates the buildup of material. The Model E is designed for longer service life and easier maintenance. Wear parts are easily accessible for replacement. The inlet impact section is easily replaced from the outside of the unit. Abrasion resistant alloy plate body liners are easily replaceable through the top of the cyclone. Replaceable and rotatable cone liners and R-35 cast inlet segments are optionally available. R-35 is extremely wear resistant and ideal for abrasive applications.
Blower Assemblies with Belt Drive
Jeffrey Rader uses standard positive displacement blowers to deliver a steady volume of air at constant velocity. Electric controls automatically shut off system if continuously overloaded, and interrupt material flow if a slight temporary overload occurs. A built-in check valve automaticaly closes when blower stops, preventing backpressure from carrying material into blower. Inlet and discharge silencers are available to reduce noise levels.
Blower Assemblies with Reducer Drive
As with the belt driven assemblies, the reducer drive assemblies also have electric controls that automatically shut off system if continuously overloaded, and interrupt material flow if a slight temporary overload occurs. A check valve automatially closes when blower stops, preventing back-pressure from carrying material into blower. Parallel shaft reduction units are standard for blowers requiring gear drives. These units are equipped with heavy duty gear cases, large diameter shafts with over-size bearings and ample gear width for transmitting horsepower to blower with a minimum service factor of 1.5. Shrouded fans mounted on high speed shaft to provide the cooling necessary for long, trouble-free silenceres are available.
Download the Pneumatic Boiler Feed brochure by clicking below. (374 kb, .pdf)
