Raw coal bunker coal feeding device and coal interruption preventing method thereof

Abstract

The invention relates to a raw coal bunker coal feeding device and a coal interruption preventing method thereof. The raw coal bunker coal feeding device comprises a raw coal bunker body, the raw coalbunker body comprises a bunker cone, the top end of the bunker cone is connected with a bunker main body, the bottom end of the bunker cone is connected with a coal feeder through a rod type valve, adehumidification pipeline is arranged at the top of the bunker cone, a blockage removing pipeline is arranged at the bottom of the bunker cone, a heat tracing device is arranged at the position, between the dehumidification pipeline and the blockage removing pipeline, of the middle of the bunker cone, and the heat tracing device is arranged on the outer wall of the middle of the bunker cone in the circumferential direction in a surrounding mode. According to the raw coal bunker coal feeding device and the coal interruption preventing method thereof, pressure relief residual nitrogen of an injection tank is recycled, so that the coal gas consumption can be reduced while raw coal is dried; heated nitrogen is designed to purge the bottom of the bunker cone of the raw coal bunker, and intermittent heating and cooling are conducted, so that the purposes of reducing bunker wall thickening and loosening a coal seam are achieved; and meanwhile, gas flow kinetic energy is utilized, the coal supply smoothness of the coal feeder is further improved, the occurrence rate of coal interruption accidents is reduced, damage to a mill is reduced, and the production cost is prevented from rising.

Description

technical field [0001] The invention relates to the field of coal powder spraying system equipment, in particular to a raw coal bunker coal feeding device and a method for preventing coal from breaking. Background technique [0002] Coal powder preparation is widely used in modern industry. In many occasions, the pulverized coal pulverization system and the pulverized coal injection system are built together, such as the coal injection system supporting the blast furnace ironmaking project. In the integrated system of blast furnace pulverized coal production and spraying, there are generally two problems as follows: First, the pulverized coal feeder occasionally breaks coal accidents, the reason is that the raw coal in the cone of the raw coal bunker sticks to each other when the water content is high The phenomenon of hanging material or material accumulation, as well as the agglomeration of raw coal on the wall of the warehouse, narrows and reduces the feeding channel, whi...

AI Technical Summary

Problems solved by technology

In the integrated system of blast furnace pulverized coal production and spraying, there are generally two problems as follows: First, the pulverized coal feeder occasionally breaks coal accidents, the reason is that the raw coal in the cone of the raw coal bunker sticks to each other when the water content is high The phenomenon of hanging material or material accumulation, as well as the agglomeration of raw coal on the wall of the warehouse, narrows and reduces the feeding channel, which leads to poor supply of raw coal; secondly, after the injection tank of the injection system is finished, the empty tank A large amount of medium and low pressure nitrogen can only be vented for disposal

For example, the utilization rate of residual nitrogen in the three-tank cycle is relatively low, and if the increased valve circuit leaks, it will easily cause gas leakage between the injection tanks; in the nitrogen replacement measures for the pulverized coal bunker, when the flow rate of depressurized nitrogen is large, it is easy to make the pulverized coal bunker Positive pressure is generated, which is prone to accidents of pulverized coal leaking into the environment, and the oxygen content and carbon monoxide content of the pulverized coal bunker are under normal conditions, so there is no need to passively add uncontrollable large flow of nitrogen to relieve pressure

Therefore, the usual pressure relief nitrogen will be indirectly discharged to the environment through the bag filter, thus wasting the recovery and utilization value of pressure relief nitrogen.

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