Method for beneficiating ore-wet raw lignite

A lignite, wet technology, used in combustion methods, preliminary treatment to promote drying of solid materials, lighting and heating equipment, etc., can solve problems such as reduced dryer power, poor heat transfer, and fluidized bed collapse.

Inactive Publication Date: 2016-08-17
RWE POWER AKTIENGESELSCHAFT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, the heat transfer deteriorates, the power of the dryer is significantly reduced, and in the worst case the fluidized layer collapses

Method used

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  • Method for beneficiating ore-wet raw lignite
  • Method for beneficiating ore-wet raw lignite
  • Method for beneficiating ore-wet raw lignite

Examples

Experimental program
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Embodiment Construction

[0037] First reference figure 1 The principle of the method is shown, which diagrammatically shows a flow chart of a fluidized bed dryer, which can be connected to a power plant boiler for burning lignite, for example.

[0038] From the lignite open-pit mining equipment, for example, pre-crushed raw lignite having an average particle size of 0 mm to 80 mm is introduced into the raw lignite coal bunker 1. From the original lignite coal bunker 1, for fine grinding, the original lignite is milled to an average particle size of, for example, 0 mm to 2 mm in two mills arranged in sequence (d 50 ). Then, in the case of mixing with dry lignite, as will be explained below, raw lignite is introduced into the fluidized bed dryer 3. The fluidized bed dryer 3 is heated indirectly by means of steam, for example via a corresponding built-in heat exchanger. The steam feed used to load the heat exchanger is shown in the method sketch ( figure 1 ) Is provided with reference numeral 4. The fluid...

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Abstract

The invention relates to a method for processing pit-moist raw brown coal, in particular for the thermal utilization in a power plant boiler. The raw brown coal is first precrushed and then comminuted in at least one milling appliance (2) and also fed to downstream drying. The drying proceeds in a fluidized bed using an indirectly heated fluidized-bed dryer (3). Some of the dry brown coal taken off from the fluidized-bed dryer (3) is branched off and added back to the raw brown coal before the drying, as a result of which the fluidizability of the brown coal is improved.

Description

Technical field [0001] The present invention relates to a method for beneficiating ore wet raw lignite, especially for heat utilization in power plant boilers, wherein the raw lignite is first pre-crushed and then crushed and transported in at least one milling device For subsequent drying, the drying is implemented in a fluidized bed using at least one indirectly heated fluidized bed dryer, and the fluidized bed dryer operates with steam as a fluidizing medium. Background technique [0002] A method for drying water-containing lignite in a fluidized bed is known, for example, from DE 20 01 723 C2. [0003] The fluidized bed drying method described there proposes to convey raw coal to a fluidized bed dryer by means of a screw conveyor. [0004] The methods known from the previously mentioned documents should be suitable for drying bulk materials whose sizes are in the range of, for example, 0.3 cm to 10 cm. For this reason, the material to be dried, such as lignite, becomes a dense...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B1/00
CPCF23K2201/20F26B1/00F26B3/084
Inventor H-J·克卢茨
Owner RWE POWER AKTIENGESELSCHAFT
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