The hot air valve, combustion valve and burner of the top-fired hot air rotary furnace are placed on the top of the hot air rotary furnace, and the hot air rotary furnace high temperature zone outlets, such as hot air outlet, combustion port and manhole, are constructed by composite bricks. The top space is burned, and the side combustion chamber or the external combustion chamber is eliminated. The structure is symmetrical, the temperature is distinct, the area is small, the efficiency is high, and the investment is small.
The top-fired hot-air rotary furnace was conceived in the 19th century. It was only in the 1960s that attention was paid to the study and the hot-air rotary furnace was started. So far, a variety of top-fired hot-air rotary furnaces have been built and operated. Among the many types of top-fired hot air rotary furnaces, China's Shougang and Russian Karukin models performed well.
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Characteristics of top-fired hot blast stove:
1) The top-fired hot air rotary furnace eliminates the side combustion chamber and fundamentally eliminates the fatal shortcoming of the internal combustion hot air rotary furnace. The top of the top-fired hot air rotary furnace is a symmetrical structure with uniform force, good structural strength and stability; and the furnace type is simple, the construction is convenient, and the steel and refractory materials are saved.
2) The top-fired hot-air selective rotary furnace uses a short-flame burner to directly burn at the vault, which reduces the heat loss due to the shortened hot gas flow distance.
3) The top-burning hot air rotary furnace has a clear temperature range, which improves the working conditions of the refractory material. The lower working temperature is low, the load is heavy, the upper working temperature is high, and the load is small. The working temperature of the refractory material can be appropriately increased and the service life can be prolonged.
However, the burners, combustion valves, hot blast valves and other equipment of the top-fired hot - air rotary furnace are all on the top of the furnace, and the position is high. It is required to be equipped with lifting equipment for installation and maintenance.