Double-roll biological coal granulator

Abstract

The invention discloses a double-roll biological coal granulator, and relates to the field of biological coal forming. The double-roll biological coal granulator comprises a rack, a double-roll forming mechanism located on the rack, and a driving mechanism for providing power for work of the double-roll forming mechanism. According to the biological coal granulator, a double-roll relative rotatingextrusion forming mechanism is adopted, flanges and grooves on two rollers are staggered, the two rollers extrude each other, forming of biomass fuel is achieved, a cantilever shaft is not adopted any more, and structural stress is reasonable. Due to the fact that the rollers are of rotation structures, a bearing and a box are fixed and are in a relatively static work state, the bearing can be subjected to continuous cyclic cooling through cooling oil, and it is avoided that the service life of the bearing is rapidly shortened in a high-temperature environment. According to the rollers, the flanges, the grooves and herringbone grooves in the surfaces of the flanges are arranged, the rollers are used for increasing flowing of biomass raw materials in the rolling process and reducing bonding of the biomass raw materials and the flanges of the rollers, the materials enter a forming mold at a flowing state, and the effective utilization rate of energy is increased.

Description

technical field [0001] The invention relates to the field of bio-coal forming, in particular to a double-roller bio-coal granulator. Background technique [0002] Biomass mainly includes sawdust, crop straw, various fruit shells, waste plants, brewing waste, livestock manure and other biomass solid materials. Biomass can be burned as fuel, which is a "high-quality, clean and efficient" fuel. [0003] Compared with the original state of biomass resources, biomass pellets have the advantages of easy storage and transportation, and long-lasting burning time. Existing biomass particle molding is mainly divided into ring die rolling, screw extrusion, and piston stamping. Among them, screw extrusion and piston stamping are still in the experimental stage. At present, the biomass particle molding at home and abroad adopts ring die rolling technology. , the development is nearly mature. [0004] When the ring die granulator is working, the material is evenly sent to the area betwe...

AI Technical Summary

Problems solved by technology

The most prominent disadvantages of ring die technology are the problems of short die life and high energy consumption

[0005] Due to the structure characteristics of the cantilever of the pressure roller of the ring die granulator, the stress state of the mold and the mold support is unreasonable. During operation, the pressure roller bearing needs to bear dynamic radial force of hundreds of tons, which is very easy to damage

In addition, when the biomass particles are formed, the friction of the biomass generates heat, and the working temperature of the ring die can reach up to 200°C. In the high temperature environment, the service life of the bearings decreases sharply. Due to the limitation of sealing conditions, the bearing cannot be cooled by circulation, and butter can only be applied at regular intervals. The cooling effect is poor and the service life of the bearing is reduced.

Due to the above two main reasons, the operating life of the main part of the biomass pellet molding equipment is reduced. The service life of a single set of molds is about 300 tons of pellets, and it is time-consuming and laborious to replace the failed molds.

[0006] In addition, due to the limitations of the forming principle of the ring die, the biomass raw material is sticky during the forming process in a high temperature environment, and the material that has not entered the forming die will stick to the barrel wall outside the forming die, and when the ring die rolls, The force of extruding the material on the wall of the barrel is far greater than the force at the forming die, which will cause more than 50% energy loss, which will increase the energy consumption of the unit particle forming of the equipment

Images