Rare earth motor control method for coal mill
A technology of motor control and coal mill, applied in the direction of comprehensive factory control, grain processing, etc., can solve the problems of lack of research and specific application, and achieve the effect of increasing the maximum amount of coal
Active Publication Date: 2022-05-31
ZHEJIANG ZHENENG TECHN RES INST +1
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Problems solved by technology
At present, there is a lack of research and specific application in solving the relationship between loading force, dynamic separator speed and coal pulverizer output at home and abroad.
Method used
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Embodiment Construction
The schematic diagram that rare earth motor drives coal mill work as shown in Figure 2, wherein coal mill 3 is connected to rare earth motor 5, and rare earth
The motor 5 is equipped with an inverter 6 with a remote control signal interface. The inverter 6 drives the rare earth motor 5, and the rare earth motor 5 drives the coal mill.
3. The frequency converter 6 is also connected to the utility power bus 8 through the transformer 7; the rotational speed of the coal mill 3 is adjusted according to the coal type and coal quantity.
As a kind of embodiment, a kind of rare earth motor control method of coal mill, its work flow as shown in Figure 3, comprises:
Taking a certain coal mill of a certain power plant as an example, 3 parameters of coal mill are shown in the following table 1:
Table 1 coal mill parameter table
[0032]
The rare earth motor 5 (rare earth permanent magnet motor) parameter of matching sees the following table 2:
Table 2 rare earth permanent magnet m...
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The invention relates to a rare-earth motor control method of a coal mill, which includes the steps of: conducting a test according to the current relevant parameter settings in each device; adjusting the angle of the folding baffle according to the measured coal fineness results; Optimize the corresponding relationship between the speed of the coal mill and the amount of coal under the current coal type. Under the five-speed coal mill speed, conduct experiments in four typical working conditions, record and analyze the data; check the current setting for the amount of pebble coal . The beneficial effect of the present invention is: make the fineness and concentration of pulverized coal in the pulverizing system controllable; propose the frequency conversion range of the coal mill motor according to the test results, and the suggested rotating speed under light load, medium load and heavy load, and guide Optimal operation of coal mills. Adjust the operation mode as needed to increase the pulverizing capacity of a single coal mill; adjust the operation mode as needed to increase the maximum coal capacity of a single coal mill.
Description
A rare earth motor control method for coal mill technical field The invention belongs to the technical field of motor control, particularly a kind of variable frequency control of rare earth motor for coal pulverizers in power plants manufacturing method. Background technique In the traditional pulverizing system of the thermal power plant, the coal mill is driven by a power frequency asynchronous motor, and its rotating speed is the basic value of the power plant. In the construction stage, it is checked according to the design coal type. After that, no matter how the coal type changes, the motor of the coal mill runs at a fixed frequency. because Therefore, the traditional pulverizing system cannot adjust the speed, which easily leads to the reduction of the output of the coal mill and the increase of power consumption after the working conditions change. and a series of questions. Existing variable load force equipment, such as dynamic separators, is a method o...
Claims
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IPC IPC(8): B02C25/00
CPCB02C25/00Y02P90/02
Inventor 杨敏何志瞧麻建中童小忠胡凯波赵力航杨威夏志凌
Owner ZHEJIANG ZHENENG TECHN RES INST