Fluidized bed grading and drying device applicable to high-moisture and large-grain-size low-rank coal

Abstract

The invention discloses a fluidized bed grading and drying device applicable to high-moisture and large-grain-size low-rank coal. The fluidized bed grading and drying device comprises a fluidized bed grading and preheating chamber, a coarse-grain fluidized bed drying chamber, a medium-grain fluidized bed drying chamber and a fine powder fluidized bed drying chamber, wherein the coarse-grain fluidized bed drying chamber is arranged at the lower part of the fluidized bed grading and preheating chamber; the medium-grain fluidized bed drying chamber and the fine-powder fluidized bed drying chamber are respectively arranged in front of and at the back of the fluidized bed grading and preheating chamber; coal grains are graded and preheated by the grading and preheating chamber; the graded coal grains overflow from different overflow pipes and are respectively fed into the coarse-grain fluidized bed drying chamber and the medium-grain drying chamber; fine powder brought out by exhausting is fed to the fine powder drying chamber through a cyclone separator and is dried; the dried fine powder is independently collected by micro powder brought out by exhausting. According to the fluidized bed grading and drying device disclosed by the invention, a grading and drying mode, namely grading first and then drying is adopted, so that coal grains are dried sufficiently and uniformly, and the energy-saving effect is good.

Description

technical field [0001] The invention belongs to the technical field of coal mine drying equipment, and more specifically relates to a fluidized bed classification drying device suitable for high-moisture, wide-particle-diameter and low-rank coal. Background technique [0002] Low-rank coal refers to coal with low carbon content, high volatile content, low calorific value, and low metamorphism, mainly including lignite, non-caking coal, long-flame coal, and weakly caking coal. Up to 20%-60%, calorific value 1000-3500Kcal / kg, small specific gravity, high volatile content, non-bonding, strong chemical reactivity, poor thermal stability, easy weathering and spontaneous combustion, difficult to wash and store, which is very important for low The utilization and transportation of rank coal has brought difficulties, and its drying pretreatment is one of the ways to solve this problem. one [0003] Fluidized bed dryers have been widely used in the coal drying process, and can be...

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Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides a fluidized bed classification drying device suitable for low-rank coal with high moisture content and wide particle size, which combines the characteristics of high moisture content and wide particle size of low-rank coal itself and its According to the characteristics of the drying process, the fluidized bed classification drying device is designed accordingly, and the structure and specific setting method of the key components such as the coarse fluidized bed drying chamber, the medium fluidized bed drying chamber and the fine powder fluidized bed drying chamber Research and design can effectively solve the problem of uneven drying of low-rank coal. At the same time, it also has the advantages of high drying efficiency and good energy-saving effect. Therefore, it is especially suitable for drying low-rank coal with large moisture content and wide particle size distribution. Applications

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