Air heating furnace pipeline spray coating and using method thereof

Abstract

The invention relates to an air heating furnace pipeline spray coating and a using method thereof and belongs to the field of refractory castables. The air heating furnace pipeline spray coating comprises the following components in parts by weight: 40-60 parts of light-weight clay bricks, 3-9 parts of perlite, 10-20 parts of high-aluminum cement, 20-30 parts of mullite, 5-8 parts of bentonite, 1-3 parts of dextrin powder, 2-6 parts of hydrated alumina, 5-10 parts of organic fibers, 8-18 parts of sodium silicate, 4-9 parts of aluminum dihydrogen phosphate and 10-15 parts of magnesia powder. The spray coating can be quickly used, is practical, does not need to be specially maintained and is high in thermal shock resistance.

Description

technical field [0001] The invention relates to a spray coating for hot blast furnace pipes and a method for using the same, belonging to the field of refractory castables. Background technique [0002] The hot blast stove is a thermal equipment that heats the air blown into the blast furnace to support combustion from normal temperature to high temperature. Using blast furnace gas and coke oven gas as fuel, the air is heated to about 1300°C. The hot blast stove pipe is a device for transporting high temperature hot air, which requires high temperature resistance. In addition, although increasing the air temperature can save coke and coal for ironmaking, increase pig iron production and reduce the operating cost of the blast furnace, after increasing the air temperature, the N in the air 2 and O 2 Reaction to produce NO X The amount also greatly increased, NO X The refractory material reaches the steel shell through the hot blast stove, and after encountering water vapo...

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Problems solved by technology

In addition, although increasing the air temperature can save coke and coal for ironmaking, increase pig iron production and reduce the operating cost of the blast furnace, after increasing the air temperature, the N in the air 2 and O 2 Reaction to produce NO X The amount also greatly increased, NO X The refractory material of the hot blast furnace reaches the steel shell, and after encountering water vapor, nitric acid is produced, which will cause corrosion of the steel shell and cause cracking

Therefore, castables are often used for the lining of hot blast stove pipes to resist high-temperature airflow erosion and achieve thermal insulation. The refractory castables that have been used include clay, high alumina, mullite, etc. These materials have been used for many years. From different The degree meets the requirements of use, but there is still the problem of high surface temperature. The temperature of the air duct reaches 300-350 ° C, so energy is wasted and the production and operation environment of the blast furnace is deteriorated. In addition, the hot air duct is difficult to form and cast.

[0003] CN102060499B (2012-10-24) discloses an acid-resistant coating composition for iron-making blast furnace hot blast stove and its application method. However, the composition needs to be cured for a long time, generally more than 3 days. Vibration still needs to be improved

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