Inert particle fluidized bed dryer

Product Overview:

Inert particle fluidized bed dryer is a new kind of high efficiency and energy saving drying device. In addition to the advantages of fluidized bed dryer, it also has the advantages of small volume, small floor space, low investment and so on. Due to the large specific gravity of inert particles, it needs a large operating gas velocity to make them flow stably, which brings the disadvantages such as high system resistance and high wind power consumption. Hence the vibratory inert particle fluidized bed dryer.

Due to the addition of vibration source, the large particles (inert carrier) in the whole bed are in a good fluidization state at a lower fluidization velocity. At the same time, the collision of inert particles on the inner wall of the equipment and the friction between them can effectively prevent the sticky wall of wet materials and produce dead bed and other bad phenomena, and ensure the continuous normal operation of the equipment. The vibrating inert particle fluidized bed dryer is suitable for drying materials with large wet content, more viscous materials and thixotropic paste paste.

The heat transfer medium can be superheated steam or nitrogen of the same solvent, and the combination form of closed circulation is adopted. The equipment has relatively small power configuration, high thermal efficiency and safe operation. Superheated solvent vapor closed loop system or nitrogen closed loop system can be widely used in almost all airtight operating equipment environment.

Working principle:

Wet materials that need to be dried are pumped into the boiling media surface to form wet material film covering, which is subjected to double heat transfer by hot air and media, quickly evaporates water, and then is broken into powder products after being dried by media movement collision.

Materials will be liquid material layer formed in the spray in bed fluidized inert particles, the particle surface to form a thin liquid film, in the hot particles and hot air, under the joint action of liquid membrane dehydration after become solid, due to the constant collision of the fluidized particles, solid state material membrane was hit off into powder, the powder material continues to be dried in the fluidized bed, and then bring out by air, by the separation and powder products.

Closed/superheated solvent steam cycle system is in a closed system environment, dry medium is inert gas or organic solvent superheated steam. Inert gas is generally nitrogen, suitable for materials containing organic solvents or toxic and harmful gases, materials are easy to oxidize environment, heat transfer medium circulation and repeated use.

Enter the drying system of nitrogen or organic solvent steam is produced by solvent generator, replace the air in the system completely, after heating into drying tower, liquid materials from the pump to spray atomizer in inert particle surface, and the heat transfer, heat transfer fluid medium heat carrier formation and double solvent was evaporated quickly, after drying is carrier motion collision broken into powder products by fan closed out. By evaporation of the organic solvent gas under the action of circulation fan, discharge drying tower, after a cyclone separation of gas and gas in the spray scrubber has been effectively dust (collected by cyclone separator capture powder as a finished product), the saturated steam and was sent to a heater within reheating for unsaturated superheated steam, dry as a heat transfer medium use again.

As is known to all, general organic solvents are inflammable and explosive dangerous chemicals, whether in the form of nitrogen closed-loop circulation or superheated solvent vapor closed-loop circulation, are inevitably involved in the inherent characteristics of the solvent to affect the safety of the system. Even if the inert gas is used as a protective heat transfer medium, it is impossible to completely condense the solvent vapor through the condenser, and the system ^ airtight is obviously not credible, and it is difficult to achieve 100% in practice. However, the solvent vapor must be in the necessary combustion, explosion concentration range and oxygen concentration to reach a certain range before combustion or explosion can occur. Under the condition of hypoxia, even if the temperature reaches the ignition point, it is impossible to ignite the solvent vapor, let alone explosion. Based on this concept, this system is equipped with an online oxygen concentration meter to detect and control the gas components in the system in real time to ensure that the solvent vapor concentration in the system is far away from the upper or lower limit of combustion and explosion. Therefore, in fact, the safety of this system is far higher than that of the open-type system with large air volume. Once a certain instrument of the system is damaged accidentally, the automatic control system will follow the pre-programmed record, automatically eliminate hidden trouble, stop, alarm prompt to avoid out of control. The equipped explosive device can relieve pressure immediately before explosion, which ACTS as the firewall behind ^ to ensure the safety and reliability of the system and equipment.

The advanced configuration of the system realizes man-machine separation, remote automatic detection and control, and no one touches the drying process and material transfer process. The operator can fully enjoy the smooth and dripping feeling of "no matter after launch".

When nitrogen closed cycle drying or superheated solvent vapor closed cycle drying, compared with the open system, the solvent contained in the raw material solution can be collected, while the material is not oxidized in the drying process.

For the material suitable for nitrogen closed loop drying and superheated solvent steam closed loop drying, it is more energy saving to use superheated solvent steam closed loop drying.