Regenerative Chamber Checker Brick Description
Regenerative chamber firebrick is a kind of heat storage carrier and heat conduction medium, which has excellent thermal characteristics such as strong heat exchangeability, large thermal storage area, excellent air ventilation ability, small resistance and so on. Checker bricks are widely used in the steel industry all over the world, mainly used in the middle and upper part of hot blast furnace regenerative chamber, plays a key role of heat transfer and accumulation during the process cold air is heated to hot air. In a hot blast furnace regenerative chamber, checker bricks are organized in order. During heating period, checker bricks’ main function is storing heat, during the air blowing period, play the role of heating cold air to hot air through convection exchange and thermal radiation exchange.
Regenerative Chamber Checker Brick Characteristics
- Has multi holes which parallel to side surface and positional convex and concave.
- Good volume stability, excellent high temperature creep under load performance.
- High density and low porosity, widely used in hot blast furnace regenerator.
Regenerative Chamber Checker Bricks Dimensions
Different dimension of checker bricks will have different thermal property. For example, earlier hot blast furnace regenerator checker bricks are standard size with 40mm holes and 32.7m2 heating area/m3. Current used top burning hot blast furnace checker bricks have 20mm holes and 64m2 heating area /m3. From various tests in China and Russia, in Kalugin top burning hot blast furnaces, 30mm holes and 20mm holes checker bricks will not form slag and won’t be blocked by dust during the whole service life of hot blast furnace. 20mm holes checker bricks can not only increase heating area, but also decrease checker bricks using quantity, can reduce hot blast furnace refractory material using in large scale, so the investment is declined.
Checker Bricks Heat Storage Mechanism
Hot blast furnace’s function is heating cold air to hot air and then delivered to blast furnace combustion chamber. The burning period and air delivering period alternatively repeat in hot blast furnace. During the burning period, high-temperature air passes through blast furnace checker bricks’ holes and transfers energy to checker bricks, during air blowing period, cold air from air blower can be heated to hot air by refractory checker bricks and be transferred to hot blast furnace combustion chamber by hot air pipe.
Regenerative Chamber Checker Brick Applications
Checker bricks are mainly used at regenerative chamber of hot blast furnace. Checker bricks with identical structure and holes are orderly arranged, so all the holes of checker bricks are connected to allow air pass smoothly. Based on technical requirement of different temperature zone, silica checker bricks and clay checker bricks are usually adopted. In some hot blast furnaces, high alumina checker bricks, mullite checker bricks and sillimanite bricks are also adopted.
