Fuel supplementing system in middle of kiln body of carbon calcination rotary kiln

Abstract

The invention relates to a fuel system, and in particular relates to a fuel supplementing system in the middle of a kiln body of a carbon calcination rotary kiln. The system comprises a rotary kiln cylinder body and is characterized in that the rotary kiln cylinder body penetrates through the center of an annular fuel tank, an annular protrusion with an opening is arranged on the end face of the kiln head side of the annular fuel tank, an annular rotary sealing steel plate is arranged in the annular protrusion and is perpendicular to the axis of the rotary kiln cylinder body, a plurality of fixing frames are arranged on the circumference of the shell of the rotary kiln cylinder body, each fixing frame is connected with the rotary sealing steel plate and the rotary kiln cylinder body, the upper portion and the lower portion of the inner wall of the protruding part of the annular protrusion are fixed to one end of an annular soft sealing piece respectively, the other ends of the two annular soft sealing pieces are in contact sealing with the rotary sealing steel plate respectively, an air outlet is formed in the rotary sealing steel plate and extends to an air outlet of a secondary air pipe through a fuel gas spraying pipe, an air pump is arranged on the fuel gas spraying pipe, the end face of the kiln tail side of the annular fuel tank is arranged at the air inlet, and micro-negative pressure exists in the annular fuel tank.

Description

technical field [0001] The invention relates to a fuel system, in particular to a supplementary fuel system in the middle of a carbon calcining rotary kiln body. It belongs to the production equipment for the carbon industry to produce calcined coke for aluminum anodes, cathodes and graphite electrodes for steelmaking. Background technique [0002] Furnace equipment commonly used for calcination of green coke (including oil-based coke and coal-based coke), mainly including tank calciner and rotary kiln. Compared with the pot calciner, the rotary kiln has the advantages of large production capacity, low cost, high degree of automation and good working environment. Moreover, when the needle coke is calcined, due to the high requirement for the calcining temperature, generally the highest temperature is 1400-1500°C. The refractory silica brick is commonly used for the tank body of the pot calciner. Coke calcination requirements, so needle coke calcination is generally also us...

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Problems solved by technology

The disadvantages of supplementing fuel at the kiln head are: (1) due to the secondary heating of the calcined coke, the carbon loss rate of the calcined petroleum coke is increased; (2) due to the high temperature generated by the fuel replenished from the kiln head The flue gas must first pass through the cooling zone, and then pass through the secondary air in the middle of the kiln body. It does not directly act on the calcination zone, which is not conducive to the control of the temperature of the calcination zone, and also wastes a lot of heat and energy; (3 ) increases the temperature of the calcined coke entering the follow-up cooling equipment, increases the load of the follow-up cooling equipment, and shortens the service life of the refractory lining of the cooling equipment

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