Inside spraying construction method of pellet roasting vertical furnace

Abstract

The invention discloses an inside spraying construction method of a pellet roasting vertical furnace, comprising the following steps: 1, determining that the ejection quantity of a used spraying machine is 2-4.8m<3>/hours, water pressure is between 0.5MPa and 0.7MPa, and the wind quantity is 5-10m<3>/minutes; 2, cleaning a furnace wall of the roasting vertical furnace; 3, arranging a plurality of layers of steel wire mesh layers which are mutually pulled and have firm structures on the furnace wall; 4, firstly adding water for wetting before adding spraying paint into the spraying machine and controlling the water content between 2% and 4%; 5, firstly curing in natural state for 6-15 hours after spraying to spontaneously cure a spraying layer; then, raising temperature and roasting, keeping the initial temperature rise speed at 15-25 DEG C/hours, and then, keeping the temperature between 130 DEG C and 170 DEG C for 3-8 hours; and then, raising temperature at the rise speed of 30-50 DEG C/hours until the finish of roasting. The construction method of the invention effectively solves the phenomena of reddening, deformation, wind escape and air leakage of the roasting vertical furnace, enhances the roasting quality of pellets and prolongs the service life of the roasting vertical furnace; the use time is long, and the maintenance expense and the production cost are lowered.

Description

technical field [0001] The invention relates to a maintenance and construction method of a roasting pellet shaft furnace in a steelmaking system, especially a pellet roasting method used in maintenance after the roasting pellet shaft furnace has air leakage, deformation, redness and other phenomena. The construction method of spraying in the shaft furnace. Background technique [0002] The pellet roasting shaft furnace used by the applicant, after many years of use, the furnace body is seriously aging, the temperature in many places of the furnace body is high, and even redness, deformation, air leakage and air leakage have occurred, which greatly affects the normal production. Production, quality and safety have brought negative effects, restricting the improvement of pellet roasting quality. The main reason is that the inside of the shaft furnace is in a state of dynamic equilibrium. On the one hand, the material column moves from top to bottom, forming a scour to the inn...

AI Technical Summary

Problems solved by technology

The traditional maintenance treatment method is grouting treatment, that is, in the outermost steel plate of the furnace body, between the damaged asbestos layer and the refractory brick layer, pour repair slurry to repair the damaged part; this kind of grouting treatment method, there are The following points are insufficient. First, the maintenance cost is high, and the annual grouting cost alone reaches more than 300,000, which increases the production cost accordingly; The bonding between the furnace bodies is not firm, and it is easy to loosen and fall off; the third is that the use time is short, and grouting needs to be repeated many times, basically once a month; the fourth is the shutdown period (including the maintenance period) required for each grouting are long, affecting the normal production

Grouting the pellet roasting shaft furnace can no longer meet the actual needs of steelmaking production