Carrier Vibrating Equipment, Inc. Coal Dryers

Carrier vibrating fluid bed thermal dryers are typically used for coals with a larger size fraction, such as run-of-mine coal. Our vibrating fluid bed units are available in sizes up to 8 ft. wide x 50 ft. long with capacities up to 250 TPH in a single unit, depending on the thermal load. Carrier coal dryers utilize vibration which significantly assists in the fluidization of sticky and wet coals, and helps convey larger particles that may not fluidize well or tend to settle to the bottom of the coal dryer bed. Carrier Fluid Bed Coal Dryer Types Vibrating fluid bed dryers Conventional flash or Tornesh flash dryers Conventional (non-vibrating) fluid bed dryers Conventional (non-vibrating) fluid bed dryers with in-bed heat exchangers Coal Types and Applications for Carrier Coal Dryers Carrier system engineers take into account each of the coal types and application processes that require special considerations and unique drying system features. For example, filter cake coals are very fine and typically hold a high volume of water. Therefore, a filter cake coal dryer must be able to handle high evaporative loads and high entrainment levels in the exhaust gases. Some coals, such as lignite, are subject to spontaneous combustion and explosions. A coal dryer for lignite should include explosion venting, a water deluge system and possibly an inert gas or a re-circulated self-inerted process gas. Conversely, anthracite coal exhibits a high ignition temperature, rendering explosion vents or a deluge system in the coal dryer unnecessary. Carrier coal dryers can treat: Run-of-mine coal Filter cake Coal fines from a prep plant Steam coal Reclaimed waste coal Coking or metallurgical grade coal Washed & sized bituminous coal Subbituminous or lignite coal prepped for gasification or liquefaction processes Typical Coal Dryer Applications Carrier has developed a number of thermal coal dryer systems for several types of coal and process applications. Some of these include: Anthracite coal for additives in the steel making industry Metallurgical grade bituminous coals used in making coke Bituminous coals used in direct steel making processes such as the “Corex” process Beneficiation of PRB coals Beneficiation of lignite coals Lignite coals prior to gasification or liquefaction Coal Dryer System Arrangements Because Carrier’s thermal coal dryer systems are custom designed for each application, there are an infinite number of arrangements and component combinations that can be provided. Some of these coal dryer configurations include: Coal dryer systems that dry only. Systems that dry and cool. Coal dryers that re-circulate the cooling zone exhaust gas to the drying zone supply for improved efficiency. Coal drying systems with closed-loop re-circulated process gas streams that are heated with a direct-fired process gas heater. Systems with closed-loop re-circulated process gas streams that are heated with indirect heat. Systems with re-circulated self-inerted process gas streams heated by direct-fired process gas heaters. Systems with recirculated indirect heated inert process gas streams, such as nitrogen, with in-bed heat exchangers.