An improvement method of coal mill impeller device based on cfd technology

Abstract

The invention provides a coal mill impeller device improvement method based on the CFD technology. The method comprises the steps of (1) establishing an integral fluid domain geometric model of the interior of a coal mill and conducting fluid grid division; (2) establishing a calculation model to conduct fluid simulating calculation through the established fluid domain geometric model and the fluid grid division according to inlet boundary condition data, obtained through actual measurement, of the coal mill; (3) changing the mounting angles and the number of guide plates in an impeller deviceand the widths of wing plates and extracting data results under different combination states of the mounting angles and the number of the guide plates and the widths of the wing plates according to the calculation model; (4) acquiring the rules of the impeller device outlet performance index changing along with changes of the mounting angles and the number of the guide plates and the widths of the wing plates according to the data results; and (5) selecting the mounting angles and the number of the guide plates and the widths of the wing plates according to the change rules.

Description

technical field [0001] The invention relates to the field of a coal mill impeller device, in particular to an improvement method for a coal mill impeller device based on CFD (computational fluiddynamics, computational fluid dynamics) technology. Background technique [0002] The impeller device is the key part in the middle position connecting the primary air chamber and the separator body in the HP coal mill. It is connected with the grinding bowl and rotates with the grinding bowl. Its function is to pass the hot air blown from the primary air chamber through the impeller device. Finally, the distribution becomes relatively uniform, and the pulverized coal particles after grinding are driven to the separator body of the coal mill for separation of pulverized coal. [0003] Research on the impeller device, improving the outlet velocity and velocity uniformity of the impeller has a major effect on the separation effect of coal powder. Patent application CN203816750U titled ...

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Problems solved by technology

[0004] However, the impeller device of the coal mill generally adopts foreign technology and drawings. In actual use in China, due to the fact that the actual working conditions and coal quality conditions are quite different from those of foreign countries, domestic companies usually do not The further structural improvement of the impeller device is carried out under the working conditions, or the improved method lacks sufficient technical support, or the structural improvement is relatively large, resulting in the defect of high cost

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