A control system and method for automatically judging and eliminating coal blockage in raw coal bunkers

Abstract

The invention discloses a control system and method for automatically judging and eliminating coal blockage of a raw coal bunker. When the control system is arranged on the spot, a control device is connected with a charging electronic belt weigher, a belt running speed sensor, a coal plough position sensor, a 3D material scanner or continuous material level gauge in the bunker, an output end and a communication interface of an electronic belt weigher arranged in a coal weighing feeder, input ends of compression air cannons and an input end of an alarming device; when the control system is arranged in the distance, a signal collecting control box is additionally arranged on the spot to be connected with the devices and the sensors and connected with a remote control device; the control system calculates the coal quantity and the coal level in the bunker through measured data of collecting equipment and the sensors, and coal blockage is judged by comparing the coal quantity and the coal level in the bunker with the coal level and the coal quantity which are measured by the 3D material scanner or continuous material level gauge; when coal blockage occurs, the compression air cannons are controlled to be started layer by layer in batches to eliminate coal blockage; when coal blockage can not be eliminated, the alarming device is started. According to the control system and method, the automatic judging, automatic cleaning and eliminating and automatic alarming functions on coal blockage of the raw coal bunker can be achieved.

Description

technical field [0001] The invention relates to the technical field of thermal power generation, in particular to a control system and method for automatically judging and eliminating coal blocking in a raw coal bunker. Background technique [0002] The raw coal bunkers of thermal power plants can store the coal required for boiler combustion for a period of time to ensure a continuous and stable supply of fuel to the units; coal jams and coal shedding in the raw coal bunkers often occur, which may cause the coal feeder at the outlet of the raw coal bunkers to trip due to coal failure , and then lead to unstable combustion of the boiler, which requires a large amount of oil to reduce the load of the unit. In severe cases, it may cause the boiler to be extinguished and the unit to shut down, resulting in serious economic losses. [0003] At present, multiple groups of compressed air cannons are generally installed in different layers and angles in the raw coal bunker; when co...

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Problems solved by technology

[0002] The raw coal bunkers of thermal power plants can store the coal required for boiler combustion for a period of time to ensure a continuous and stable supply of fuel to the units; coal jams and coal shedding in the raw coal bunkers often occur, which may cause the coal feeder at the outlet of the raw coal bunkers to trip due to coal failure , and then lead to unstable combustion of the boiler, which requires a large amount of oil to reduce the load of the unit. In severe cases, it may also cause the boiler to be extinguished and the unit to shut down, resulting in serious economic losses.

[0003] At present, multiple groups of compressed air cannons are generally installed in different layers and angles in the raw coal bunker; when coal blockage occurs, the compressed air cannons are activated in batches; by quickly opening the valve port of the air cannon air storage tank, the compressed air in the tank is formed The strong airflow ejected at high speed, the high-speed impact blocks the raw coal particles, the sudden release of the expansion shock wave overcomes the arching or sticky wall formed by the static friction of the material, and also forms an impact vibration on the inner wall of the raw coal bunker, making the raw coal in the bunker Gravity flow can be restored to slide down smoothly, eliminating coal blockage; however, at present, power plants still mostly use manual observation combined with experience to judge whether there is coal blockage in the raw coal bunker, and start the compressed air cannon locally or by remote manual control. Manpower and material resources. At the same time, the accuracy of judging the coal blocking situation and the timeliness of eliminating the coal blocking are not high. Unreasonable and frequent use of compressed air cannons will also compact the coal, aggravating the coal blocking and blighting

[0004] At present, there are also power plants that determine coal blockage in coal bunkers by monitoring the output of the coal flow detector in the coal feeder, coal feeder coal volume regulator instructions, and feedback deviations, and use this as a basis to control the compressed air cannon to start clearing the coal blockage. , but it is relatively lagging behind to judge coal blocking by the above method. When the monitoring signal gives a signal of coal blocking, the coal blocking situation in the raw coal bunker is often serious. A large amount of raw coal was shaken off by the compressed air cannon and damaged the coal feeder

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