Full-automatic coal bunker water cannon dredging device

Abstract

The invention relates to a full-automatic coal bunker water cannon dredging device which is particularly used for dredging blockage inside a coal bunker through pressurized water, and belongs to the technical field of coal bunker devices. The full-automatic coal bunker water cannon dredging device comprises a plurality of spray nozzles, a water conveying pipeline, a water tank and a control cabinet. All the spray nozzles are connected with a main water conveying pipe through branch water conveying pipes. The main water conveying pipe is connected with the water tank. An electromagnetic valve is arranged on each branch water conveying pipe. A pressurization pump is arranged between the water tank and the water conveying pipeline. A water level indicator is arranged in the water tank. A water supplementation valve is arranged on the water inlet of the water tank. A PLC and a time relay are arranged in the control cabinet. The PLC is electrically connected with the water supplementation valve, the water level indicator, the pressurization pump and the electromagnetic valve. By means of the full-automatic coal bunker water cannon dredging device, potential safety hazards caused by blockage and coal shortage in running of a mill can be eliminated, the fuel oil self-injection situation which is caused by coal shortage to the mill is reduced, unsafe factors can be avoided as much as possible for running of a unit, and therefore safety, reliability and economical efficiency of running of the unit are greatly improved; the advantages of being safe, saving energy and being low in cost and good in dredging effect are achieved, and no influence on coal conveying is produced.

Description

technical field [0001] The invention relates to a fully automatic coal bunker water cannon dredging device, in particular to dredge the blockage in the coal bunker by pressurized water, and belongs to the technical field of coal bunker equipment. Background technique [0002] At present, the raw coal in coal bunkers of coal-fired power plants will be clogged to varying degrees during the start-up or operation of the pulverization system, and most of them occur at the contraction part at the bottom of the coal bunker and the coal drop pipe from the coal bunker to the coal feeder. It is mainly because the pulverized coal is formed into lumps due to backlog, which leads to the blockage of the pulverized coal passage, which is difficult to break with a shovel. Pulverized coal blockage not only affects the normal start-up and operation of the thermal power unit’s pulverizing system, but also affects the unit’s ability to meet the load at peak loads, increasing the oil used for th...

AI Technical Summary

Problems solved by technology

Regardless of the reasons for the blockage of the raw coal flow in the coal bunker, there are two points that can be qualitative. One is that the blockage caused by the dry raw coal is a physical phenomenon, just like the dry mud in the rice field, which looks like a piece of iron, and it turns into mud when it meets water. Ba, after the water dries up, it will form a hard mud block like an iron plate. This is the principle of earth bricks; second, the coal does not flow uniformly in the coal bunker, especially a considerable part of it is stuck on the coal bunker wall and does not flow for a long time. Staying in the coal bunker, the water in the coal will continue to evaporate, and the coal will become drier and harder after being hardened, the coal will become larger and larger, and the circulation channel will become smaller and smaller, eventually leading to blockage

[0004] In the prior art, in order to clear the blockage of the coal bunker, the following methods are generally adopted: one is to use an electric rapping device, fix the electric rapping device to a certain part of the coal bunker, and dredge it outside by rapping, logarithmic One hundred tons of coal is pressed against the coal bunker, and the dredging effect of fixed rapping is limited; the second is to adopt a hydraulic dredging device, and the dredging channel is formed by a hydraulic pull bar push bar. The situation is getting more and more serious. At the same time, the maintenance workload of the hydraulic oil system is heavy. When the pull rod is not in operation, pushing the grill increases the coal flow resistance, and the effect is not ideal. It has a certain effect on the part of the coal bunker, but the air in the coal pile compacted in the coal bunker will release the pressure energy without direction, which still cannot meet the purpose of quickly dredging and starting the grinding group

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