Rotary kiln automatic feeding system and control method thereof

Abstract

The invention discloses a rotary kiln automatic feeding system and belongs to the field of metallurgy. The rotary kiln automatic feeding system comprises a kiln cylinder, a feeding pipe which extendsinto a preheating section of the kiln cylinder, a sealing cabin which is connected to the upper end of a material pipe, a feeding cabin which is arranged at the upper end of the sealing cabin, an upper sealing valve and a lower sealing valve; and the upper sealing valve and the lower sealing valve are arranged at the inlet and the outlet of the sealing cabin respectively. The rotary kiln automaticfeeding system is characterized in that a low material level sampling probe is arranged in the feeding pipe; a material in the feeding cabin is a conductive material; a slide rheostat and intermediate relays are sequentially connected to the other end of the low material level sampling probe; the intermediate relays are in ground connection; a normally closed contact of each intermediate relay isconnected with a time relay; and electromagnetic valves are connected to the upper sealing valve and the lower sealing valve respectively. By utilizing the feeding system, the material can be ensurednot to obstruct normal closing of the lower sealing valve arranged on the sealing cabin, the gas tightness of the interior of the kiln cylinder can be ensured, and a protection function on the material can be formed.

Description

technical field [0001] The invention relates to a feeding system, in particular to an automatic feeding system for a rotary kiln and a control method thereof, belonging to the field of metallurgy. Background technique [0002] Rotary kiln refers to rotary calcining kiln (commonly known as rotary kiln), which belongs to the manufacturing equipment of metallurgy, chemical industry and building materials. Rotary kiln can be divided into cement kiln, metallurgical chemical kiln and lime kiln according to different materials. Metallurgical and chemical kilns are mainly used for magnetization roasting of lean iron ore in iron and steel plants in the metallurgical industry; oxidative roasting of chromium and nickel-iron ore; roasting of high-alumina bauxite in refractory plants and clinker and aluminum hydroxide in aluminum plants; roasting of chromium ore in chemical plants And minerals such as chromium ore powder. According to different energy supply effects, it is divided into...

AI Technical Summary

Problems solved by technology

[0005] In the rotary kiln, in order to protect the material in the kiln barrel and prevent the denaturation of the material, protective gases such as nitrogen are generally sent into the closed kiln barrel to form ambient gas, which also becomes atmospheric gas. The airtight rotary kiln is used to isolate the air. The feeding bin is equipped with a closed valve, so it is impossible to visually observe the amount of material added

Adding too much material will cause the valve to fail to close normally, and too little will affect the amount of material accumulation and lead to unstable working conditions

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