Method for removing formed ring of rotary kiln under high temperature by using forsterite and sodium silicate

Abstract

The invention relates to a method for removing formed ring of a rotary kiln under high temperature by using forsterite and sodium silicate. The invention adopts the technical scheme that the method comprises the following steps: mixing 5 to 15 percent of forsterite ore powder, 5 to 15 percent of sodium silicate powder and 70 to 90 percent of coal powder in percentage by weight, and stirring the mixed powder for 10 to 30 minutes; and then, burning the mixed powder at a ring formation part of the rotary kiln directly through a nozzle at the burning temperature between 1,300 and 1,600 DEG C tillthe formed ring of the rotary kiln is softened to collapse, and discharging the formed ring outside the kiln along with the rotation of the rotary kiln so as to keep the normal production of the rotary kiln. The fuel adopted by the method is coal powder used by a rotary kiln device, the raw material sources of the forsterite and the sodium silicate are wide, and the resources are rich. The methodcan ensure the normal production of the rotary kiln, does not need to stop the kiln to manually remove the formed ring, can effectively solve the universal problem of ring formation when the rotary kiln uses the coal powder as the fuel, and has low cost.

Description

technical field [0001] The invention belongs to a method for removing rings in a rotary kiln at high temperature, in particular to a method for removing rings in a rotary kiln by using forsterite and sodium silicate at high temperature. Background technique [0002] During the rotation process of the rotary kiln, although the material layer is in direct contact with the kiln lining, it is often inevitable that various components in the kiln material will adhere to the kiln lining. , only the fine particles with light specific gravity and the dust in the flue gas are first attached to the refractory lining of the kiln wall. The adhesion of such extremely fine particles is mainly through mechanical deposition, and a small amount is formed through chemical bonding. [0003] When the rotary kiln is in normal operation and the kiln temperature and clinker rate are stable, the kiln skin can continuously hang and fall off by itself to ensure a stable kiln skin thickness. Once ther...

AI Technical Summary

Problems solved by technology

[0005] After the rings appear, firstly, it will affect the ventilation in the kiln, and the increase of CO concentration in the flue gas will accelerate the growth of the rings; secondly, because the thickness distribution of the rings on the circumference is not the same, the rings will pass through during the kiln rotation. The large and small materials in the kiln affect the temperature change of the kiln head and also affect the quality of the clinker; the third is the high-temperature material leaked from the seal of the kiln tail, which not only causes damage to the sealing parts, but also causes harm to people or electric control instruments and circuits. ; Fourth, once the knot rings partly fall off, the kiln head will run away, which will cause certain harm to the person or the grate cooler and the kiln head dust collector

[0006] At present, the methods for dealing with the ring formation in the rotary kiln include the empty burning method with cut material, the alternating cold and hot method, and the kiln cannon bombardment method, etc., but the effect is not ideal, and the ring formation cannot be effectively removed.

Only stop the kiln and remove it manually, affecting normal production