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Indirectly heated fluidized bed dryer

A fluidized bed drying, indirect technology, used in indirect heat exchangers, fluidized bed heat exchangers, heating to dry solid materials, etc., can solve the problems of fluid mechanics interference, the dryer shell is not kept constant, etc. Reduce dust discharge, avoid fluidized bed coarsening, and improve heat transfer effects

Inactive Publication Date: 2011-10-19
RWE POWER AKTIENGESELSCHAFT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the solution of EP 0341347 A1 has the disadvantage that the cross-sectional area of ​​the dryer housing does not remain constant over its height in the region of the heat exchanger inserts
This will cause disturbances in the hydrodynamics in the fluidized bed, which is undesirable for power optimization reasons

Method used

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  • Indirectly heated fluidized bed dryer
  • Indirectly heated fluidized bed dryer
  • Indirectly heated fluidized bed dryer

Examples

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Embodiment Construction

[0027] figure 1 The fluidized bed dryer (1) shown has a housing (2) with a rectangular cross-section. A filling pipe (4) with a honeycomb wheel gate (5) is arranged on the upper end surface (3) of the fluidized bed dryer (1) as a raw lignite feeding device. On the lower end of the fluidized bed dryer (1) away from the upper end surface (3), a funnel-shaped outlet end (7) is provided below the aeration bottom (6), and a honeycomb wheel gate is arranged on the lower end of the outlet end. (5) Form mechanical discharge device. There, too, a screw conveyor or the like can be used as a mechanical discharge device instead of the honeycomb wheel gate. In this embodiment, the fluidized bed dryer ( 1 ) is mainly used for drying lignite and is described with reference to a method for drying lignite. However, the invention should be understood that the dryer can also be used for drying other particulate matter.

[0028] The gas filling bottom (6) is provided with a nozzle (8) for fee...

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Abstract

The invention relates to an indirectly heated fluidized bed dryer (1) for drying wet, fine-grained bulk materials. The fluidized bed dryer (1) comprises a housing (2) having a gassing floor (6) having heat exchanger fixtures extending above the gassing floor (6) and at least one discharge device below the gassing floor (6) for the dried bulk material. The fluidized bed dryer (1) according to the invention is characterized in that the usable flow cross section of the housing (2) in the area of the heat exchanger fixtures decreases over the height of the heat exchanger fixtures in the flow direction of the fluidizing material, as the cross-sectional area of the housing remains the same. In this manner, an unallowable expansion of the stationary fluidized bed is reliably prevented.

Description

technical field [0001] The invention relates to an indirectly heated fluidized bed dryer for drying moist fine-grained bulk material such as lignite, the fluidized bed dryer comprising a housing with an aerated bottom, above the aerated bottom Extended heat exchanger inserts and at least one discharge device for dried bulk material arranged below the aerated bottom. Background technique [0002] Such a fluidized bed dryer is known, for example, from DE 196 20 047 A1. [0003] When processing lignite into boiler coal for combustion in a steam generator, it is known to simultaneously pulverize and grind lignite (grinding dry) in impact mills and hammer mills which are components of power plant boilers, Wherein, the drying energy required for drying is provided by the branched flue gas flow. [0004] As the prior art has shown, the raw lignite of the fresh mine is dried in a fluidized bed dryer with relatively low energy consumption. However, fluidized-bed contact dryers are...

Claims

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Application Information

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IPC IPC(8): F26B3/084
CPCF26B3/084F28D13/00
Inventor H-J·克卢茨C·莫泽
Owner RWE POWER AKTIENGESELSCHAFT
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