Heat insulation method for top combustion type silicon brick hot-blast stove

Abstract

The invention discloses a heat insulation method for a top combustion type silicon brick hot-blast stove. Each heat insulation operation procedure of the heat insulation method comprises the following operation steps: burning, banking, blasting and burning again; all the heat insulation operation procedures are circularly performed in sequence; when the temperature of the arch of the hot-blast stove drops to 900 DEG C, burning is started, and a combustion-supporting air combustion valve, a gas shut-off valve and an air and gas regulating valve are opened to adjust the volume of gas to 40000 to 55000 m3 / h, the gas pressure to 6 to 10 kpa, the combustion-supporting air pressure to 4 to 5 kpa, and the ratio of the combustion-supporting air flow rate to the volume of gas to 0.6 to 0.7; after the temperature of the arch at the upper part of the hot-blast stove is burnt to 1350 DEG C, the burning is stopped, and banking operation is performed; when the temperature of the arch of the hot-blast stove drops to 900 DEG C, blasting is started, a manhole at the lower part of the hot-blast stove is opened, and air is sent to the hot-blast stove with the reference that the increasing rate of the arch temperature is 1 DEG C / min; and when the temperature of silicon bricks drops to 900 DEG C, air supply is stopped, and the manhole, a hot blast valve and a backflow blowing-down valve are closed; and burning is repeated, and the cycle is conducted sequentially.

Description

technical field [0001] The invention relates to a heat preservation method for a top-combustion silica brick hot blast stove, which belongs to the technical field of heat preservation of hot blast stoves. Background technique [0002] At present, the design air supply capacity of blast furnace hot blast stoves of iron and steel plants A and B is 1250°C, and the service life is 30 years. quality bricks. Among them, the performance of siliceous bricks has the characteristics of high temperature resistance and high load softening temperature (1500°C), but it undergoes lattice transformation during the heating process, which is the most violent at 600°C. At the same time, the thermal shock resistance of silica bricks is poor and cannot withstand Hot and cold. Therefore, after the hot blast stove is put into use, if it has been stopped for more than 16 hours due to maintenance and other reasons, the furnace body will dissipate heat, and the temperature of the high-temperature p...

AI Technical Summary

Problems solved by technology

In this way, the grate restricts the operation of the furnace; the insufficient firing of the furnace hinders the increase of the temperature of the vault

As a result, the temperature of the upper part is getting lower and lower, and the temperature of the lower part is getting higher and higher, and finally the serious consequences of scrapping the entire hot blast stove