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Three Roller Grinding Mill

Process control of Three Roller Grinding Mill

The main process controls are as follows:

1. Three Roller Grinding Mill inlet and outlet temperature control

When grinding lignite, the inlet temperature of the Three Roller Grinding Mill is controlled to not exceed 265 ° C, and the outlet temperature of the separator is controlled to be 60 & mdash; 65 ° C. When the outlet temperature of any separator reaches 65 °C, the interlocking full opening corresponds to the cold damper of the Three Roller Grinding Mill, the hot damper is fully closed, the interlocking is put into the inert steam; the outlet temperature of the separator reaches 65 °C alarm, and the 80 °C trips. In the warm grinding process, the control temperature does not exceed 50 ° C; when the coal feeder breaks coal, it is especially important to note that the separator outlet temperature does not exceed 70 ° C.

2, fineness control of coal powder

The splitting baffle of the Three Roller Grinding Mill separator for grinding lignite should be opened, the pulverized coal particles should be properly coarsened, and the fineness of pulverized coal should be maintained at 25% to 30%.

3. Control of coal level

The Three Roller Grinding Mill needs to continuously check the coal level, so it is necessary to ensure that a certain coal is kept in the Three Roller Grinding Mill. At the same time, maintaining a certain amount of coal in the mill can make the Three Roller Grinding Mill achieve good grinding efficiency, and then Guarantee the output of the Three Roller Grinding Mill.

In order to prevent the coal powder concentration in the Three Roller Grinding Mill from reaching the explosion limit after coal breaking, the Three Roller Grinding Mill level control is suitable for operation at 500-700Pa.

4, total air volume control

The output of the Three Roller Grinding Mill is controlled by adjusting the amount of primary air entering the mill. Therefore, it is necessary to ensure a certain output according to the load of the boiler, and to ensure that the coal and coal powder have sufficient pulverized coal conveying speed in the pipeline, and the total air volume, the inlet air volume and the bypass air volume should be controlled.

In order to prevent the occurrence of powder accumulation and burner burnout accidents, increase the primary wind speed to 28-35m/s, and the wind speed should not be lower than 22m/s at any time to enhance the ability of primary wind to carry coal powder.

5, control oxygen

The internal oxygen content of the Three Roller Grinding Mill is generally achieved by controlling the level of the grinder and the reversal of the inerting steam of the Three Roller Grinding Mill. Due to the particularity of the double-inlet and double-out steel ball mill structure, an oxygen measurement point is generally installed at the outlet coal powder separator on both sides of the mill to monitor the oxygen content in the mill. Referring to the low-oxygen value of lignite detonation in Table 2, it is required that the oxygen content of both sides of the mill at any time during operation is controlled at 6%-8%.

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