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.
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[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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