Non-oxidizing kiln contains a large amount of carbon black due to the reduced air ratio and the formation of a reducing atmosphere. In order to remove carbon black, it is necessary to perform secondary combustion, but the secondary combustion burner attached to the kiln is lined with a refractory material of a special shape. In order to efficiently mix with the combustion air, the auxiliary burner is used to burn to a stable state. However, in the stable high temperature area, the auxiliary burner is hardly needed because the exhaust gas can spontaneously ignite. In addition, when the asphalt-impregnated refractories are fired, since the exhaust gas contains a benzo-flours and an aluminum alloy ladder, the secondary combustion exhaust gas is required to render it harmless.
In the past, exhaust gas at 800°C or higher after the secondary burning of a glass screen printer was diluted and cooled with the atmosphere in order to protect the smoke exhauster before discharge. Due to the large heat loss due to this operation, it is necessary to perform heat exchange before dilution and cooling in order to increase the combustion efficiency.
Although the total fuel consumption of the kiln is reduced, the operating rate of the tunnel kiln is reduced due to the reduced production of fired bricks, so the fuel consumption may not necessarily be reduced. On the other hand, due to the low vulcanization of the fuel, as well as the exhaust gas treatment and the like, the environmental pollution is significantly reduced. At the same time, the working environment has also been improved. Although it is a dusty work site, it has reached the level that does not require wearing a dust mask. In the refractories market, large quantities of products will continue to be subject to downward pressure on prices of imported products in the future, and it is believed that there will be a trend to further increase the number of varieties and batches.
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