Efficient external heat type rotary kiln

Abstract

The invention relates to an efficient external heat type rotary kiln, and belongs to the technical field of rotary kilns. The efficient external heat type rotary kiln specifically comprises a spiral conveyor and a low-temperature flue gas collection chamber, the spiral conveyor and the low-temperature flue gas collection chamber are arranged at the feeding end of a kiln body, the spiral conveyor penetrates through the low-temperature flue gas collection chamber, the discharging end of the kiln body is provided with a pyrolysis material collecting device, an annular high-temperature flue gas distribution chamber is arranged on the inner wall, close to the discharge end, of the kiln body, one side of the annular high-temperature flue gas distribution chamber is in communication with the low-temperature flue gas collection chamber through a plurality of flue gas heat exchange tubes, the other side of the annular high-temperature flue gas distribution chamber is in communication with a high-temperature flue gas central tube through a high-temperature flue gas conduit, the end of the high-temperature flue gas center tube is provided with a high-temperature flue gas collection chamber, and the high-temperature flue gas collection chamber is connected with a high-temperature flue gas tube. According to the efficient external heat type rotary kiln, the design is reasonable, the flue gas chamber is not in direct contact with the kiln body, the kiln body deformation caused by too high temperature of the kiln body can be effectively avoided, and the heat loss is small.

Description

Technical field [0001] The invention relates to a high-efficiency external heating type rotary kiln, belonging to the technical field of rotary kilns. Background technique [0002] In the well-known rotary kiln heating device, there are two internal heating methods and external heating methods. The internal heating directly contacts the heating medium with the heated medium, so that the produced volatile gas has a low calorific value and can be used later. Low, not only causes energy waste, but also runs counter to the clean and efficient use policy. The external heating method currently announced includes jacket heating and radiant tube heating. The heat exchange area of ​​jacketed heating can only be achieved by increasing the area of ​​the equipment, with low thermal efficiency and low processing capacity, which affects large-scale production. The radiant tube heating adopts the air intake method of the external hot flue gas chamber. The external hot flue gas chamber is set ...

AI Technical Summary

Problems solved by technology

The heat exchange area of ​​jacket heating can only be realized by increasing the equipment area, which has low thermal efficiency and low processing capacity, which affects large-scale production

Radiant tube heating adopts the air intake method of the external hot flue gas chamber. The external hot flue gas chamber is set near the middle of the rotary kiln. The materials at the hot flue gas inlet and the discharge end cannot be heated effectively, and the heat utilization rate is low.

The temperature of the hot flue gas in contact with the equipment is very high, the material and strength of the equipment are high, the thermal stress is difficult to eliminate, and the heat loss increases, which not only increases the equipment investment, but also is not conducive to the long-term operation of the equipment

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