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Closed loop drying system and method

A drying and coal drying technology, applied in the direction of drying solid materials, drying gas arrangement, heating to dry solid materials, etc.

Active Publication Date: 2013-11-06
SCHWING BIOSET
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although existing innovations have provided advanced coal drying technologies, further improvements in coal drying efficiency and cost are still desired

Method used

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  • Closed loop drying system and method
  • Closed loop drying system and method
  • Closed loop drying system and method

Examples

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Embodiment Construction

[0018] The present invention provides improved methods and systems for drying certain materials, including coal. Although various types of particulate matter can be dried using the present invention, the examples described herein relate to the drying of coal in particular. Drying coal presents certain challenges (ie spontaneous combustion). However, the methods and systems described for drying coal may also be used for drying other types of particulate matter. While the following examples explicitly relate to coal drying, it should be understood that the methods and systems of the present invention are not limited to coal drying, but include other types of particulate matter (eg, biomass, peat, solid waste, etc.).

[0019] In one embodiment, the method for drying coal uses a closed loop system using a waste heat source and an inert fluidizing gas. By using a fluidized bed with an inert fluidizing gas to dry the particulates, the level of oxygen present in the drying system c...

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Abstract

A drying system includes a fluidized bed dryer and fluidizing gas loop. The system is a closed loop so that fluidizing gas used to dry particulate matter can be reconditioned and recycled to fluidize and dry additional particulate matter. The fluidizing gas is reconditioned by removing fine particulates and water vapor. The drying system includes oxygen control features to prevent oxygen from entering the system. A method for drying particulate matter includes fluidizing the particulate matter in a dryer with a fluidizing gas, heating the particulate matter to remove water, removing water vapor and fluidizing gas from the dryer, removing fines and water vapor from the fluidizing gas, recirculating the fluidizing gas to the dryer to fluidize additional particulate matter and removing dried particulate matter from the dryer. A modular drying system reduces the amount of construction necessary at the installation site.

Description

Background technique [0001] Most of the world's electricity is generated by burning fossil fuels such as coal. The four main types of coal are (from highest to lowest): anthracite, bituminous, sub-bituminous, and lignite. Higher rank coals typically include less moisture and fewer pollutants than lower rank coals. Coal is often dried to increase its grade and heating value (kJ, BTU / lb). Drying coal provides additional benefits besides increased grade and heating value. For example, once the moisture is removed after drying, the coal is lighter and can be transported more easily and at lower cost. Therefore, coal drying is an important step in power generation. [0002] Various coal drying methods and systems have been used over the past few decades, including rotary kilns, cascaded rotary bed dryers, elongated slot dryers, bucket dryers, traveling dryers, and vibrating fluidized bed drying device. Many of these methods and systems require high temperatures and pressures....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B3/10F26B21/14C10B57/10
CPCF26B21/04F26B3/084F26B21/14F26B21/086C10B57/10F26B21/022F26B21/10
Inventor 乔纳森·N·奥尔托马斯·M·安德森查里斯·迈克尔·万斯卓姆
Owner SCHWING BIOSET