(1) Refractories for hot air ducts
Including air supply branch pipe, total pipe and blast furnace hot air pipe. With a thickness of 70 ~ 300mm clay thermal insulation brick for the insulation layer lining, the thickness of the working layer of 70 ~ 170mm, generally with clay brick masonry, but the hot air outlet and the interface with the total duct and other parts of the application of high alumina bricks or mullite bricks. Blast furnace hot air pipe and air supply branch pipe using high alumina cement or phosphate refractory castable material casting the whole lining, service life of 1~3 years. In addition, using refractory castables cast on-site hot air pipe joints or corner part of the lining, the integrity of the number, the use of the effect is also good.
(2) Refractories for hot air valve
Hot air valve double-sided heat, but also to withstand mechanical vibration and abrasion when the valve lift and temperature changes generated by thermal stress and other effects, working conditions are poor. Valve lining body using clay brick or high alumina brick masonry, service life of 6 ~ 10 months. 1978 years, the hot air valve lining body commonly used alumina cement refractory castables cast in the manufacturing plant and baked factory, service life can reach 1.2 ~ 2.5 years.
(3) Flue and chimney refractories
The flue and chimney are the channels for exhaust gas exclusion. The hot air furnace adopts the downward smoke exhaust method, and each hot air furnace is equipped with branch flue, and the exhaust gas is excluded from the chimney through the total flue. The flue lining is generally made of clay bricks. Chimneys are commonly constructed of poured concrete or red brick, with the lower portion lined with clay bricks as a protective layer.
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