The hot air rotary furnace is mainly composed of a hot air rotary oven body, a burner, a combustion and a control system, and a mixing air cylinder is arranged behind the hot air rotary oven to mix the flue gas generated by the hot air rotary furnace with the circulating smoke gas phase, and finally The required temperature and flow rate are used to supply gas equipment.
The external type of the hot air rotary oven is a closed horizontal cylindrical overall structure supported by a saddle support. The whole is divided into two parts, namely the combustion chamber and the mixing chamber. A temperature regulating tuyere (mixed cold air outlet) is arranged at the front end and the tail end of the combustion chamber, and a swirling support is arranged between the outer layer of the combustion chamber and the outer layer of the furnace, and the mixing chamber is provided with a temperature regulating air inlet and a hot air outlet.
According to the temperature inside the pven, the refractory lining material is selected as low cement high aluminum heat resistant material, and the thickness of the refractory lining is determined according to the heat transfer calculation. At ambient temperature, the temperature rise of the outer surface of the hot air rotary furnace should be no more than 60 °C. The refractory lining material of the hot air rotary furnace must have a factory certificate and be inspected by a third party agency.
The tempering wind tangentially enters the outer jacket of the combustion chamber from the side of the rotating furnace body, and then enters from the uniformly distributed holes on the front end surface of the combustion chamber and the circumference of the tail cylinder surface (mixed cold air holes), and mixes with the high temperature flue gas of the combustion chamber. The temperature of the combustion chamber is about 1050 ° C, and the temperature of the temperature adjustment wind is about 20 ° C. When the temperature adjustment wind is mixed into the high temperature flue gas of the combustion chamber, the temperature of the combustion chamber tail (into the mixing chamber) can be lowered to 900 ° C. Protects the lining. The outer jacket of the combustion chamber can make the temperature regulation wind flow evenly and be preheated, and at the same time play the gas layer heat preservation effect, thereby achieving the effect of thinning the furnace lining and reducing the temperature of the outer surface of the rotating furnace shell.
Most of the tempering wind enters the mixing chamber evenly from the combustion chamber housing, so that the flue gas from the furnace is mixed with the tempering wind. This not only ensures the uniformity of the flue gas temperature at the outlet of the hot air rotary furnace, but also causes the hot air to rotate. The size of the mixing chamber of the furnace is reduced.