Bowl-type medium speed coal mill

A technology of coal mill and medium speed, applied in the field of bowl type medium speed coal mill, can solve the problems of downtime, inconvenient maintenance and high external size of the coal mill, reduce vibration, reduce failure rate and improve reliability Effect

Active Publication Date: 2007-06-27
上海电气上重碾磨特装设备有限公司 +1
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AI Technical Summary

Problems solved by technology

If the air pressure fluctuates or fails, the valve will automatically close under the action of gravity, which will cause the entire coal mill to stop due to failure
[0007] c) The structure is complex, maintenance is inconvenient, and the overall size is high, which affects the overall layout of the coal mill

Method used

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  • Bowl-type medium speed coal mill
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  • Bowl-type medium speed coal mill

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Embodiment Construction

[0016] As shown in Figure 2, the bowl-type medium-speed coal mill of the present invention mainly includes: a coal drop pipe 1, a separator top cover 3, an inner cone 13, a separator body 4, an impeller device 5, a reduction box 6, and a discharge valve device 2. Folding door adjustment device 15, venturi tube 14, spring variable loading device 12, side body device 10, grinding roller device 11, bowl grinding device 9, sealed air header 8, pebble coal discharge port 7, multiple outlets Device 16 etc.

[0017] The reduction box 6 is composed of planetary gears, has an appropriate reduction ratio, and is directly driven by the electric motor. The reduction box 6 is directly connected with the grinding bowl device 9 to make the grinding bowl reach the required rotating speed. The side body device 10 is equipped with a liner, forms an air inlet around the grinding bowl, and supports the separator body 4, and the hot air used for drying and transporting coal powder is introduced t...

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Abstract

The bowl-type medium speed coal mill includes a coal shoot, a separator cap, an inner cone, a separator, a vane wheel unit, a speed reducer, an exhaust valve unit, a door regulator, a Venturi, a side machine body, a milling roll unit, a milling bowl unit, a sealed air manifold and a coal gangue exhaust port. The variable loading spring unit for controlling the loading force is fixed on the separator and connected via pull rod screw to the milling roll unit. The bowl-type medium speed coal mill has high reliability.

Description

technical field [0001] The invention relates to a bowl-type medium-speed coal pulverizer used in a boiler pulverization system of a coal-fired thermal power plant. Background technique [0002] The structure of the existing bowl-type medium-speed coal mill is shown in Figure 1. It mainly consists of coal drop pipe, separator top cover, inner cone, separator body, impeller device, planetary gear reducer, discharge valve device, folding door adjustment device, Venturi pipe, side body device, bowl grinding device, It is composed of sealed air header, pebble coal discharge port and other components. [0003] The grinding roller of this coal mill adopts a hydraulic variable loading device 17 . Although theoretically speaking, this will automatically change the loading force of the grinding roller with the coal feeding rate; at the same time, since the loading force changes linearly with the coal feeding rate, it can also reduce power consumption; however, in actual operation, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C15/04B02C23/08
Inventor 叶志强沈光明吴正华
Owner 上海电气上重碾磨特装设备有限公司
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