Coal pulverizing system and method for large-proportion blending combustion of bituminous coal of steel ball coal mill
The technology of a steel ball coal mill and a pulverizing system is applied in the field of iron and steel environmental protection, and can solve the problems of insufficient drying output of the pulverizing system, increasing the proportion of mixed burning bituminous coal, and low temperature of the powder mixture.
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Embodiment 1
[0117] 1. If figure 1 As shown, the embodiment of the present invention provides a pulverizing system for a large proportion of mixed-fired bituminous coal in steel ball mills, including:
[0118] Coal feeding device for collecting mixed coal;
[0119] The coal grinding device 2 is used to crush the mixed coal to obtain crushed materials; the coal grinding device 2 is provided with a first inlet A and a first outlet B;
[0120] Coarse powder separator 31 is used to separate the crushed materials to obtain coarse coal powder; the coarse powder separator is provided with a second inlet and a second outlet, and the second the inlet communicates with the first outlet of the coal mill;
[0121] The fine powder separator 32 is used to separate the coarse coal powder to obtain fine coal powder. The fine powder separator is provided with a third inlet, a third outlet and a exhaust gas outlet. The fine powder The third inlet of the separator communicates with the second outlet of the ...
Embodiment 2
[0135] The embodiment of the present invention provides a pulverizing system for a large proportion of bituminous coal mixed with steel ball coal mills, which is the same as that of Example 1. The proportion of bituminous coal in the mixed coal is 60%, and the cold air at the outlet of the blower is directly mixed into the coal mill. The inlet method can no longer meet the requirement that the outlet temperature of the coal mill is below 80°C. The method of closing the cold air pipe and performing hot air cooling is adopted. The method includes the following steps:
[0136] 1) Through the raw coal transportation chain 12, the mixed coal is sent from the coal feeding device 1 to the coal grinding device 2, crushed by the coal grinding device 2 for 16 minutes, and then passes through the pulverized coal pipeline from the first outlet B to the coarse powder separator 31, The fine powder separator 32 is connected to separate coal powder;
[0137] 2) 8-10 tons / hour of unqualified c...
Embodiment 3
[0143] The embodiment of the present invention provides a pulverizing system for burning bituminous coal with a large proportion of steel ball mills, which is the same as that of Example 1. The proportion of bituminous coal in the mixed coal is 70%, and the cold air pipe is closed and hot air is cooled. method, the method comprising the steps of:
[0144] 1) Through the raw coal transportation chain 12, the mixed coal is sent from the coal feeding device 1 to the coal grinding device 2, crushed by the coal grinding device 2 for 16 minutes, and then passes through the pulverized coal pipeline from the first outlet B to the coarse powder separator 31, The fine powder separator 32 is connected to separate coal powder;
[0145] 2) 8-10 tons / hour of unqualified pulverized coal is returned to the coal grinding device 2 for reprocessing, and 35-37 tons / hour of qualified coal powder is sent to the pulverized coal collection device 4 and merged with the exhausted gas from the top of th...
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