Method and system for weakening bubbles in gas-solid separation fluidized bed

Abstract

The invention relates to a method and system for weakening bubbles in a gas-solid separation fluidized bed, belongs to the technical field of coal preparation of gas-solid separation fluidized beds, and solves the problem of large bed layer space density volatility of the gas-solid separation fluidized bed in the prior art. The method comprises the following steps: acquiring a pressure signal in a fluidized bed layer online, and matching motion characteristic behavior information of bubbles in the bed layer in an intelligent database according to the pressure signal; adjusting superficial gas velocities of different areas of a fluidized bed air distribution plate and the negative pressure of a fluidized bed negative pressure column according to the motion characteristic behavior information of the bubbles; monitoring a pressure change signal in the bed layer in real time after weakening adjustment of the bubbles in the bed layer, and calculating a bed layer density fluctuation standard deviation value according to the pressure change signal; and performing weakening adjustment on the bubbles again according to the density fluctuation standard deviation value to ensure that the density fluctuation in the fluidized bed is maintained in a preset density fluctuation standard deviation range. The stability of the bed density in accordance with the requirement is achieved, and the coal separating precision is improved.

Description

technical field [0001] The invention relates to the technical field of gas-solid separation fluidized bed coal preparation, in particular to a method and system for weakening bubbles in a gas-solid separation fluidized bed. Background technique [0002] As an efficient coal dry separation technology, gas-solid fluidization separation plays a very significant role in the protection of water resources and the reduction of environmental pollution, especially for coal preparation operations in the arid / alpine regions of Northwest China. Technical advantages. As it plays an increasingly important role in the field of coal preparation, the complexity and variability of the internal space environment of the gas-solid fluidized separation system has gradually attracted widespread attention. [0003] In the actual separation process, the migration of air bubbles in the bed is a key factor that directly affects the stability of the bed density, while the bed space density of the trad...

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Problems solved by technology

[0005] In view of the above analysis, the embodiment of the present invention aims to provide a method and system for weakening bubbles in a gas-solid separation fluidized bed to solve the problem of large fluctuations in the bed space density of the existing gas-solid separation fluidized bed. The problem of low sorting efficiency

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