Raw material vertical mill external circulation system and process

Abstract

The invention discloses a raw material vertical mill external circulation system comprising a material proportioning belt conveyor, an elevator, a feeding conveying mechanism, a feeding three-way joint, a V-shaped powder concentrator, an external circulation roller type vertical mill, a cyclone, a circulation draught fan and a dust remover. The external circulation roller type vertical mill comprises a powder milling barrel on the lower portion and a powder concentration barrel on the upper portion. A mill is arranged in the powder milling barrel. The powder concentrator is arranged in the powder concentration barrel. The powder milling barrel and the powder concentration barrel are separated through a partition plate. An outlet of a powder concentration coarse powder ash hopper of the powder concentrator penetrates through the partition plate and extends into the powder milling barrel. Materials are not conveyed to the powder concentrator in a pneumatic manner to be subjected to separation any more, and due to the adoption of concentrated mechanical conveying of the elevator, the gas flow resistance is greatly reduced, and the electricity consumption is substantially reduced. Thepowder concentrator is still above the vertical mill, the civil engineering cost can be greatly reduced, and the device input can also be greatly saved.

Description

technical field [0001] The invention relates to a material bed grinding equipment, in particular to an external circulation system and process of a raw material vertical mill. Background technique [0002] At present, most of the raw material production in the cement production line adopts roller vertical mill equipment. This traditional grinding equipment has the problems of low output and high power consumption. Since the system process is a traditional process, the materials in the mill need to be transported by wind and sprayed by the nozzle ring, etc., which greatly increases the gas flow resistance, causing the resistance of the mill system to reach 8000-10000Pa or even higher. In addition, due to the structure of the powder classifier, the powder classifier Insufficient capacity and a large amount of powder return result in low classification efficiency and affect the performance of the mill. In addition, the unreasonable design of the parameters of the grinding mech...

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Problems solved by technology

Since the system process is a traditional process, the materials in the mill need to be transported by wind and sprayed by the nozzle ring, etc., which greatly increases the gas flow resistance, causing the resistance of the mill system to reach 8000-10000Pa or even higher. In addition, due to the structure of the powder classifier, the powder c

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