Dry slagging air-locking system controlled by utilizing resistance change trend

Abstract

The invention provides a dry slagging air-locking system controlled by utilizing a resistance change trend, and the system is accurate in material level in a reaction ash hopper and good in air-locking effect. The dry slagging air-locking system comprises a slag crusher, an ash hopper, a chain wheel machine, a bucket elevator and a controller, wherein a plurality of first pressure gage pipes are arranged on the high-altitude inner side wall of the ash hopper, and all the first pressure gage pipes are located on one same horizontal plane; a first pressure gage connected with the first pressure gage pipes is arranged on the outer side wall of the ash hopper; a plurality of second pressure gage pipes are arranged on the low-altitude inner side wall of the ash hopper, and all the second pressure gage pipes are located on one same horizontal plane; a second pressure gage connected with the second pressure gage pipes is arranged on the outer side wall of the ash hopper; each first pressure gage pipe and each second pressure gage pipe are respectively connected with an air supply device so as to realize air supply; each first pressure gage and each second pressure gage are electrically connected with the controller respectively; and the controller is used for recording the pressure change of each first pressure gage and the pressure change of each second pressure gage and forming a material level turning-on or turning-off signal, so as to control the chain wheel machine to run or halt.

Description

technical field [0001] The invention relates to a dry slag discharge lock air system controlled by resistance variation trend. Background technique [0002] The dry slag discharged from power plant boilers is often used for road construction, cement additives, brick making, etc., which improves the comprehensive utilization rate of fly ash and cancels the ash yard. [0003] One part of the dry slag discharge system of the power plant boiler is to send the ash discharged from the cold ash hopper of the power plant boiler to the slag bin. In order to facilitate ash transportation and ash release, the slag bin is directly connected to the atmosphere. Due to the large negative pressure at the cold ash hopper of the utility boiler, in order to prevent atmospheric cold air from entering the furnace from the ash conveying passage, an air lock is set in the middle of the ash conveying passage. The existing air locker is a slag hopper installed under the slag crusher, and a sprocket...

AI Technical Summary

Problems solved by technology

However, before the ash and slag enter the ash hopper, the large pieces of slag are crushed by the crocodile-type slag crusher. In order to adapt to the larger slag, the gap between the two rollers of the crocodile-type slag crusher should not be too small, so the ash that falls into the slag The ash and slag particles in the bucket are relatively large, the accumulation is loose and uneven, the accumulation state is uncertain, and there are many gaps, so that the above method has great errors and misjudgments, resulting in the failure of the material level switch, and the chain wheel machine is in continuous operation. The slag hopper is empty, losing the function of sealing air leakage

In actual operation, in order to make up for the above defects and further prevent air leakage into the furnace, the shut-off door of the cold ash hopper at the bottom of the furnace is often opened and closed. For a long time, it is easy to block the outlet of the cold ash hopper and cause a safety accident

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