Air ring air speed distribution measurement and adjustment device and method of coal mill

Abstract

The invention relates to an air ring air speed distribution measurement and adjustment device and method of a coal mill. The air ring air speed distribution measurement and adjustment device comprises a plurality of pitot tubes corresponding to air ring openings one by one, a plurality of pressure measuring devices and connection pipes which correspond to the pitot tubes one by one, a plurality of flow guide plates located in an inlet air channel, and adjusting rods corresponding to the flow guide plates one by one, wherein each pitot tube is provided with a measuring head, a static pressure hole and a total pressure hole; each measuring head is located under the corresponding air ring opening and is just opposite to the air direction of an air ring inlet; the total pressure holes and the static pressure holes are connected with the pressure measuring devices by the connection pipes; the flow guide plates are arranged on the adjusting rods; a plurality of pairs of through holes corresponding to the adjusting rods one by one are formed in the wall surface of the inlet air channel; the adjusting rods are sleeved with the through holes; and the two ends of the adjusting rods stretch out of the wall surface of the inlet air channel. According to the air ring air speed distribution measurement and adjustment device, the air ring air speed distribution is measured by the pitot tubes and adjusted by the flow guide plates, and raw coal is prevented from falling from air rings with the low air speed, so that the problem of discharging the raw coal of the coal mill is solved, the utilization rate of the raw coal is improved and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of coal pulverizers, in particular to a device and method for measuring and adjusting wind speed distribution of an air ring of a coal pulverizer. Background technique [0002] At present, the primary air of the coal mill enters the grinding area of ​​the coal mill from bottom to top through the air ring, and the pebble coal falls from top to the pebble coal header through the air ring. The main reason for the problem of raw coal is that the wind speed of the wind ring is not enough. Usually, the problem of a large amount of raw coal discharged by the coal mill is solved by increasing the wind speed of the wind ring as a whole by increasing the ventilation rate and reducing the circulation area of ​​the wind ring. However, in actual operation, even if the calculated wind speed of the wind ring meets the theoretical requirements by increasing the ventilation rate, some coal mills still have the problem of dis...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a device and method for measuring and adjusting the wind speed distribution of the wind ring of the coal mill, which can measure and adjust the distribution of the wind speed of the wind ring, solve the problem of raw coal discharge by the coal mill, and improve the utilization rate of raw coal

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