Pelletizing and granulating system and pelletizing and granulating method with large amount of fly ash

Abstract

The invention relates to a pelletizing and granulating system and pelletizing and granulating method with large amount of fly ash, and belongs to the technical field of powder pelletizing and granulating. A feeding screw machine is positioned above a disc type pelletizer, a secondary waiting hopper is positioned above the feeding screw machine, a secondary mixing machine is positioned above the secondary waiting hopper, a secondary batching scale is positioned above the secondary mixing machine, a primary waiting hopper is positioned above the secondary batching scale, a primary mixing machineis positioned above the primary waiting hopper, a powder material discharging device is positioned above the primary mixing machine, a primary batching scale is positioned above the powder material discharging device, a batching screw machine is positioned above the primary batching scale, a silo is positioned above the batching screw machine, a bin top dust remover is positioned above the silo,the disc type pelletizer, the secondary waiting hopper, the secondary mixing machine, the secondary batching scale, the primary waiting hopper, the primary mixing machine and the primary batching scale are connected with a dust remover in a building, the disc type pelletizer, the secondary mixing machine and the primary mixing machine are connected with a water admixture device.

Description

technical field [0001] The invention relates to a large-volume fly ash pelletizing system and pelletizing method, belonging to the field of powder pelletizing. Background technique [0002] my country is rich in coal resources, and coal as the basic fuel for power generation accounts for a large proportion. After the coal is made into coal powder, the coal powder burns in a suspended state in the furnace, and most of the combustible materials in the coal can be burned out in the furnace, while a large amount of non-combustible materials (mainly ash) in the coal powder are mixed. in high temperature flue gas. These non-combustibles are partially melted due to the action of high temperature, and at the same time due to the action of their surface tension, a large number of fine spherical particles are formed. Under the action of the induced draft fan at the tail of the boiler, the flue gas containing a large amount of ash flows to the tail of the furnace. As the flue gas te...

AI Technical Summary

Problems solved by technology

[0006] In the field of powder granulation and granulation, the amount of fly ash used in the powder proportioning of the granulation equipment is small, and the equipment is one-time batching and one-time mixing. After the proportioning, the powder is lifted to the height by bucket elevator In the mixer, the structure is complex and the mixing cycle is long. The batching and discharging time of the mixer with the same volume is relatively long, and the productivity is low.

[0007] The extrusion granulator is used in the forming machine, which destroys the porous properties of the particles after granulation; the drum granulator is used, although the production efficiency is high, but the granulation size and particle size are different, and it occupies a large area.

Images