Drying and calcining method for bulk material and device thereof

Abstract

The invention discloses a drying and calcining method for a bulk material and a device thereof. The method comprises the following steps: enabling a bulk material layer with a certain thickness to perform continuous horizontal movement, repeatedly turning over the material by using a material overturning device which is fixed above the material and inserted in the material layer, enabling the material to rapidly and uniformly perform heat exchange with an outside heat source or cold source, thereby achieving a purpose of drying and calcining the material and cooling; enabling the material to be laid on a carrier which can be continuously and circularly operated, and fixedly installing the material overturning device, a heating and cooling device, a feeding and discharging device and a smoke and cooling gas outlet above the carrier. The above carrier which can be continuously and circularly operated is a rotary-operated annular kiln car or an annular floating body which is rotatably operated in an annular liquid tank, and a closed annular kiln cavity is installed above the carrier. The material overturning device, the heating and cooling device, the feeding and discharging device and the smoke outlet and the like are installed on a fixed kiln wall or kiln top, so that an annular horizontal rotary kiln is formed.

Description

technical field [0001] A method and equipment for drying and calcining materials, especially cement raw meal. Background technique [0002] In industry, the traditional drying and calcining equipment for materials is rotary kiln, commonly known as rotary kiln, which is a linear cylindrical equipment that rotates along its central axis. In the working rotary kiln, the horizontal position of the inlet is higher than that of the outlet, and the entire cylinder is placed obliquely. This facilitates the movement of the material from the feed port to the discharge port in the cylinder. The drying and calcination method of the rotary kiln for the material is: the cylinder rotates under the action of the rotating device, the biomass is fed into the cylinder from the feed port, and the material is rotated and rotated around the cylinder under the action of the rotating and tilting device of the rotary kiln. The circular motion of the body is a compound motion from high end to low e...

AI Technical Summary

Problems solved by technology

[0004] However, this kind of rotary kiln has some insurmountable disadvantages. First, the lining material is seriously worn and difficult to repair; second, the cylinder body is easily deformed and the lining bricks are easy to fall off; and high operating costs; fifth, it is difficult to manufacture it for a long time as required, so that the cement raw meal cannot be preheated, dried, evaporated, dehydrated, silicate decomposed, solid-phase reaction, and liquid-phase reaction in the rotary kiln and cooling throughout the calcination process

The processes of preheating, drying, water evaporation, dehydration and silicate decomposition have to be moved outside the kiln, and processed with extremely complicated processes and equipment, which greatly increases heat dissipation and power consumption as well as investment and operating costs

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