Coal chute with air-returning preventing device

Abstract

The invention relates to a coal chute capable of preventing coal outage and air returning of a positive pressure direct-fired coal pulverizing system, and discloses a coal chute with an air-returning preventing device. A coal chute body is provided with a baffle set, a heavy hammer mechanism and a sealing chamber. The baffle set is composed of one or more baffles, and the baffles are hinged to the inner wall of the coal chute body. The sealing chamber is formed in the outer wall of the coal chute body and communicated with the interior of the coal chute body through an open hole formed in the wall of the coal chute body. The heavy hammer mechanism is arranged in the sealing chamber, a connection rod of the heavy hammer mechanism extends into the coal chute body to support the baffles, and the baffles swing on the inner wall of the coal chute body under the supporting effect of the connection rod to control opening and closing of a coal falling opening of the coal chute body. The baffle set is opened in the normal coal falling process and is closed in the coal outage process, and therefore the phenomena of coal outage and air returning are prevented, and the safety performance is high.

Description

technical field [0001] The invention relates to a new type of coal drop pipe which can prevent a positive pressure direct blowing type pulverizing system from breaking coal and returning to air. Background technique [0002] At present, a large number of large coal-fired generating units with a single unit capacity of 300MW and above are equipped with double-inlet and double-outlet coal mills and positive pressure direct blowing pulverization systems. The raw coal is ground by the coal mill, dried, and then transported to the separator by airflow for separation. , Qualified pulverized coal is blown into the furnace by the primary air, and the positive pressure direct blowing pulverizing system has the advantages of simple system and fast load response. [0003] However, during the actual operation of the coal-fired power unit, because the inside of the coal mill generally maintains a positive pressure of several thousand Pa, once the raw coal bunker and the connected raw coa...

AI Technical Summary

Problems solved by technology

In the lighter case, the boiler will burn, and the water level of the steam drum or separator will be unstable. In the severe case, the belt of the coal feeder will be burned due to the heating of the hot air, the boiler will be extinguished, and the unit will be shut down unplanned.

In actual operation, in the rainy season or when the incoming coal is wet and sticky, frequent coal breaks and wind return often occur, seriously affecting the stable operation of generators, power systems, and the safe and economical operation of the entire power plant

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