Coal feeding device for raw coal bunker and method for preventing coal from breaking

Abstract

The invention relates to a raw coal bunker coal feeding device and a method for preventing coal disconnection, comprising a raw coal bunker body, the raw coal bin body includes a bin cone, the top of the bin cone is connected to the bin body, and the bottom end of the bin cone is connected to a coal feeder through a rod-type valve; The top of the cone is equipped with a dehumidification pipeline, the bottom of the bin cone is equipped with a blockage removal line, and the middle part of the bin cone is located between the dehumidification line and the blockage removal line. A heat tracing device is installed around the outer wall of the middle part of the bin cone. Zhou Shang. By recycling the pressure-relief residual nitrogen of the injection tank, the coal gas consumption can be reduced while drying the raw coal; through the design of heating nitrogen to purge the bottom of the raw coal bunker cone, and intermittent heating and cooling, to reduce the thickness of the bunker wall and loose the coal seam , At the same time, the gas flow energy is used to further increase the coal supply smoothness of the coal feeder, reduce the incidence of coal breaking accidents, reduce the damage of the mill, and prevent the increase of production costs.

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.

Images