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The flow mode and heat exchange mode of particles and hot air flow in the flash
dryer
The essence of the drying process is the diffusion process of moisture
.
It is carried out by external diffusion and internal diffusion
.
Out-diffusion is the process in which moisture on the particle surface diffuses from the surface to the surrounding medium in the form of vapor
.
Intradiffusion is the process by which moisture moves inside a particle
.
After the hot air is fully burned through the hot blast furnace, it is mixed with air to generate hot air, and the hot air is sent to the air inlet of the rotary flash tower.
Under the joint action of hot air, it is quickly fluidized
.
At the same time, the moisture in the material is vaporized, and the material that has not been fully dried is quickly dispersed and dried under the action of the agitator
.
The dried powder will pass through the elutriation ring at the top of the flash dryer and enter the pulse bag filter for separation with the flue, and the collected product will enter the subsequent process section through the star discharge valve
.
It is mainly from the exhaust gas discharged from the hopper pressure flash dryer, and the high temperature is mainly from the hopper pressure flash dryer and the heating system of the injection molding machine
.
The hot air recovery system is directly installed on the hopper pressure flash drying machine.
The blower air flow of the pressure flash drying machine is used to flash the drying machine.
In the pellet dryer, there is no need to connect another power supply to form the recovery of hot air
.
The hot air recovery system has its own filter pressure flash dryer cleaner, which can filter the dust and then recycle it
.
Because the inhalation of the pressure spray drying equipment granulation dryer is clean hot air, it can save 20-30% of the heating power of the pressure spray granulation drying equipment
.
In this way, the use of the hot air recovery system and the recycling of the exhaust gas saves electricity, reduces the temperature in the workshop, and cleans the air at the same time
.
Reduced dust pollution in the workshop
.
The flow mode of particles and hot air flow: There are both convection and co-current in the lower part of the cylinder, and for coarse materials, it is more convection and co-current for repeated heat exchange
.
For fine-grained materials, it is parallel with the hot air flow, so the drying process can be completed in an instant
.
The drying of the particles is actually the use of hot air drying with high temperature and low humidity
.
These particles are mainly adsorbed by water and filled in the gaps of the particles.
Under the conditions of high temperature and low humidity, the heat conduction of the whole particle is slow, resulting in local stress concentration and drying, cracking, breaking, dispersing, and accelerating the drying process
.
The rotary flash dryer adopts the high-speed hot air flow into the cylinder in the tangential direction.
Due to the spiral motion of the airflow in the cylinder, the temperature of the medium around the particles is reduced, and the flow rate and temperature of the medium are increased, which greatly improves the speed of external diffusion
.
The high-temperature airflow impacts the particles or small wet materials located in the lower part of the cylinder at high speed, and at the same time, the stirring effect of the stirring blades in the cylinder makes the particles are broken, the particle size is reduced, and the length of the internal capillary is also reduced, which strengthens the effect of internal diffusion.
Reduce the resistance to internal diffusion
.
Most of these particles are broken repeatedly in the cycle of high temperature and high stirring intensity in the lower part of the cylinder
.
Eliminating material agglomeration is also a powerful measure to promote internal diffusion and strengthen the evaporation of particle moisture
.
dryer
The essence of the drying process is the diffusion process of moisture
.
It is carried out by external diffusion and internal diffusion
.
Out-diffusion is the process in which moisture on the particle surface diffuses from the surface to the surrounding medium in the form of vapor
.
Intradiffusion is the process by which moisture moves inside a particle
.
After the hot air is fully burned through the hot blast furnace, it is mixed with air to generate hot air, and the hot air is sent to the air inlet of the rotary flash tower.
Under the joint action of hot air, it is quickly fluidized
.
At the same time, the moisture in the material is vaporized, and the material that has not been fully dried is quickly dispersed and dried under the action of the agitator
.
The dried powder will pass through the elutriation ring at the top of the flash dryer and enter the pulse bag filter for separation with the flue, and the collected product will enter the subsequent process section through the star discharge valve
.
It is mainly from the exhaust gas discharged from the hopper pressure flash dryer, and the high temperature is mainly from the hopper pressure flash dryer and the heating system of the injection molding machine
.
The hot air recovery system is directly installed on the hopper pressure flash drying machine.
The blower air flow of the pressure flash drying machine is used to flash the drying machine.
In the pellet dryer, there is no need to connect another power supply to form the recovery of hot air
.
The hot air recovery system has its own filter pressure flash dryer cleaner, which can filter the dust and then recycle it
.
Because the inhalation of the pressure spray drying equipment granulation dryer is clean hot air, it can save 20-30% of the heating power of the pressure spray granulation drying equipment
.
In this way, the use of the hot air recovery system and the recycling of the exhaust gas saves electricity, reduces the temperature in the workshop, and cleans the air at the same time
.
Reduced dust pollution in the workshop
.
The flow mode of particles and hot air flow: There are both convection and co-current in the lower part of the cylinder, and for coarse materials, it is more convection and co-current for repeated heat exchange
.
For fine-grained materials, it is parallel with the hot air flow, so the drying process can be completed in an instant
.
The drying of the particles is actually the use of hot air drying with high temperature and low humidity
.
These particles are mainly adsorbed by water and filled in the gaps of the particles.
Under the conditions of high temperature and low humidity, the heat conduction of the whole particle is slow, resulting in local stress concentration and drying, cracking, breaking, dispersing, and accelerating the drying process
.
The rotary flash dryer adopts the high-speed hot air flow into the cylinder in the tangential direction.
Due to the spiral motion of the airflow in the cylinder, the temperature of the medium around the particles is reduced, and the flow rate and temperature of the medium are increased, which greatly improves the speed of external diffusion
.
The high-temperature airflow impacts the particles or small wet materials located in the lower part of the cylinder at high speed, and at the same time, the stirring effect of the stirring blades in the cylinder makes the particles are broken, the particle size is reduced, and the length of the internal capillary is also reduced, which strengthens the effect of internal diffusion.
Reduce the resistance to internal diffusion
.
Most of these particles are broken repeatedly in the cycle of high temperature and high stirring intensity in the lower part of the cylinder
.
Eliminating material agglomeration is also a powerful measure to promote internal diffusion and strengthen the evaporation of particle moisture
.
