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Vibrating Fluid Bed Dryers for Industrial Salt Granule Drying

Views: 61     Author: Site Editor     Publish Time: 2022-11-22      Origin: Site

Vibrating Fluid Bed Dryers Performance Characteristics

Hywell design advanced fluid bed drying technology for salt drying applications (sea salt, rock salt, vacuum salt /brines,sodium chloride, sodium sulfate) for a large range of capacities. The salt dryer is manufactured in corrosion-resistant AISI-316 and other grades.

The fluid bed dryer is designed for drying salt crystals with a moisture content of 4% to 0.05%. The material properties of sodium sulfate are almost the same as those of sodium chloride, so this equipment can dry sodium sulfate

Vibrating Fluid Bed Dryers Design Parameter

Drying material:

Sodium Chloride (NaCl)

Crystals size:

d50   NaCl = approx. 0.350 mm

Bulk density:

from   1 282 to 1 330 kg / m3

Moisture content when   feeding:

4-5%   (of gross weight)

Moisture content of the   finished product:


Feeding speed:

2   500 kg / h

Product exit rate:

2400 kg   / h

Dryer evaporation:

76 kg   / h

Product temperature:

70   ° C maximum after cooling section

Drying medium:

Air   heated to 250 ° C by electrical + steam

Layer heigh:

10   to 50mm ~ maximum 100mm

Vibrating Fluid Bed Dryers installation height

Nominal height:

150   m above sea level

Climatic conditions

Summer:          +30 o C

Winter:   -10 o C

Engineering support systems for the salt dryers

Power supply:  

 50 Hz / 3 ph / 380 V

Salt Drying Machine Video

                      Table of Content


Basic safety instructions


Installation safety

03 Description of 2.5T Sodium Chloride (NaCl) Fluid Bed dryer
04 8Ton Sodium Salt Vibration Fluid Bed Dryer

Vibrating Fluid Bed Dryers for Salt Basic safety instructions

Only qualified and authorized personnel are allowed to work on the equipment. Before working on the fluidized bed dryer, the power must be turned off and the electrical power source disconnected from the local control panel. All circuit breakers must be disconnected and the main power supply must be padlocked.

It must be reliably verified that all safety precautions have been taken and that qualified personnel has been authorized to operate the fluidized bed dryer.

During the entire operation of the dryer, all protective guards and guards included in the delivery must be installed. If the safety instructions are not followed, the fluidized bed drying machine can present a special hazard and cause death or injury to personnel.

Hywell Dryers Ltd will not accept any responsibility for any damage caused by non-compliance or any violation of the safety rules.

Vibrating Fluid Bed Dryers for Salt Installation Safety

This vibration fluid bed dryer has been designed and manufactured to provide the highest possible protection for personnel during operation. However, the user must ensure that all protective equipment installed is maintained as supplied and that both operating and maintenance personnel take maximum precautions to prevent hazardous working conditions.

It is very important that the consumer, and his employees are aware of and comply with all the requirements of the current legislation regarding the safety of workers at the installation. All precautions must be taken to protect personnel from moving parts of machinery and to minimize fire hazards.

Description of 2.5T Vibrating Fluid Bed Dryers for Salt

1. General description of salt dryer

Hywell design advanced vibration fluid bed dryer for salt drying applications (sea salt, rock salt, vacuum salt /brines,sodium chloride, sodium sulfate) for a large range of capacities. The vibration fluid bed dryer is manufactured in corrosion-resistant AISI-316 and other grades.

The fluidized bed salt dryer consists of one drying section followed by one cooling section and has a total dimension of 5000 mm in length x 650 mm in width. The upper and lower chambers of the salt dryer are separated by a fluidized bed plate with the product located on the upper surface.

Sodium chloride is fed through an annular chute to the inlet port of the vibration fluid bed dryer. The salt drier chute has a rectangular cross-section and slope, which ensures the distribution of the product along the entire width of the fluidized bed as it arrives.

The combined action of the hot air for the fluidized bed rising from the bottom chamber and the vibration of the dryer move the product along the 3.5 m long drying bed and then into the 2.0 m cooling section. Sodium chloride is dried and cooled at the same time.

The dried and cooled product leaves the dryer and is discharged through a chute (discharge chute) into the consumer's loading device. The adjustable measuring descent during unloading controls the product layer thickness and, accordingly, the holding time.

A fixed-speed heating air fan of the salt drying machine delivers filtered air to the electric heater for subsequent hot air to the drying section. The airflow is controlled by a manual air valve that allows hot air to flow to the bottom under the fluidized bed plate.

A fixed-speed cooling air fan supplies filtered air to the cooling section. The airflow is controlled by an air valve that allows cold outside air to flow to the bottom under the fluidized bed plate.

At extremely low intake air temperatures, the motorized air valve allows warm used air to flow back into the cooling air stream to increase the temperature of the cooling air.

The air used in the salt dryer, including moisture, is directed through a pipe from the lower chamber, and then passes through a bag filter to collect small contaminants. The fines are returned to the chute through the butterfly valve to recover the full amount of dried sodium chloride.

A fixed-speed exhaust fan is located downstream of the bag filter, it removes the exhaust air into the consumer's exhaust air duct for the final release into the atmosphere. The air outlet valve regulates the flow of the extracted air.

2.The sending air fan to the salt vibration fluid bed dryer

The scope of delivery includes a 4 kW dynamically balanced centrifugal fan with a backward curved impeller made of epoxy-coated carbon steel on a foundation.

The fan draws out filtered outside air at temperatures from (-) 10 to +30C and delivers it through an electric heater to the lower chamber of the NaCl dryer. A manual air valve allows the flow to be throttled for optimum fluidized bed performance.

3.Salt fluid bed dryer size

The salt dryer use our the Vibration Fluidized bed dryer, It consists of a drying section 3.5 m long x 0.65 m wide and a cooling section 2.5 m long x 0.65 m wide, including the following main components:

4. Lower pressure chamber of the salt drying machine:

•      made of 304 stainless steel, the structure consists of bent and welded sheets.

•      attached to the stainless steel fluidized bed plate with mounting hardware.

•      Equipped with a stamped top flange to accommodate a perforated fluidized bed air distribution plate made of 316L stainless steel.

•      Equipped with a duct inlet flange.

•      Equipped with a connection for fitting a thermocouple to the inlet.

5. Upper discharge chamber of salt dryer equipment:

•      made of stainless steel 316L stainless steel, the structure consists of bent and welded sheets.

•      equipped with a stamped bottom flange for connection to the lower pressure chamber.

•      equipped with three flanged exhaust air outlets on the top wall, with built-in corrugated pipes for connection to the exhaust air duct.

•      Equipped with a connection for mounting a thermocouple on the exhaust side of the vibration-fluidized bed dryer.

•      equipped with viewing windows and removable covers.

6. Unloading the product:

•      a manually adjustable product discharge baffle that forms a hopper for unloading the contents of the upper chamber into the consumer's discharge conveyor.

7. Vibrating Fluid Bed Dryers for salt support and drive:

•      the lower plenum is supported by mounting elements, which in turn are screwed to the fluidized bed weld plate.

•      equipped two sets with a 2.2 kW electric drive motor powered by 3-phase 380 V, 50 Hz, closed type with fan cooling, with a degree of protection IP55. The drive unit can be controlled by an inverter drive (frequency converter) to control the vibration speed of the dryer.

8.  Duct system of the salt drying machine:

Designed for connecting fans, heating, and exhaust systems; connecting air ducts are included in the delivery set.

The duct system of salt dryers includes:

• Factory-made 304 stainless steel inlet and outlet sections.

•      Manual air valve on the intake air duct.

•      Manual air valve on the exhaust air duct.

•      Manual balancing valve for clean air.

9.Differential pressure gauge of salt granules drying machine

The sodium salt dryer is equipped with a differential pressure gauge to measure the pressure drop in the baghouse filter to monitor the condition of the filter bags.

10.  Exhaust fan of the salt virbation fluid bed drying machines

Scope of delivery includes a base-mounted, 11 kW, fixed speed, dynamically balanced centrifugal fan with a backward curved impeller made of 304 stainless steel.

The fan removes the air and any moisture from the upper chamber of the dryer and cooler through a bag filter and removes them into the consumer's exhaust air duct. A manual air valve allows the flow to be throttled for optimum fluidized bed performance.

11. Control panel and instrumentation of the vibrating fluid bed salt dryer

The floor-mounted local control panel is equipped with the following components:

•      Programmable logic controller

•      Intake fan starter

•      Cooler inlet fan starter

•      Exhaust fan starter

•      Vibration inverter drive (frequency converter)

•      Human-machine interface

•      Indicator lamps

•      Control buttons

•      Emergency stop button

380V 3 phase 50Hz Control system

24 VDC Programmable Logic Controller

12. Bag filter of the Salt Vibrating Fluid Bed Dryers

The supplied baghouse has a plurality of synthetic polyester cylindrical filter elements to separate contaminants from the exhaust air drawn from the dryer/cooler.

Contaminants are discharged through a butterfly valve installed at the bottom of the unloading hopper and fed to the consumer's product collection equipment.

The filter bag and butterfly valve, like all other product wetted parts, are made of 304 stainless steel.

13. Noise level of the salt Vibrating Fluid Bed Dryers

All equipment components shall be capable of providing a free field noise level below 85 dB when measured at a distance of one meter from the external surface of the installation.

8Ton Sodium Salt Vibration Fluid Bed Dryer

Key Features to Consider

When selecting a vibrating fluid bed dryer, several key features should be taken into consideration:

  1. Vibrating bed design

    The design of the vibrating bed should promote optimal fluidization and prevent the formation of dead zones. Look for a design that allows for easy cleaning and maintenance.

  2. Heating system options

    Different heating systems, such as electric, steam, or gas, can be used in vibrating fluid bed dryers. Consider the availability of energy sources, cost-effectiveness, and the specific heating requirements of the materials being dried.

  3. Airflow control

    Look for dryers that offer precise control over airflow rates and distribution. This ensures uniform drying and allows for adjustments based on the specific drying requirements of different materials.

  4. Material handling capabilities

    Consider the ease of loading and unloading materials into the dryer. Look for features such as adjustable feed rates, discharge systems, and options for integrating the dryer into existing production lines.

Maintenance and Operational Considerations

To ensure optimal performance and longevity of a salt vibrating fluid bed dryer, proper maintenance and operational practices are crucial. Here are some considerations:

  1. Cleaning and maintenance procedures

    Follow the manufacturer's guidelines for regular cleaning and maintenance of the dryer. This includes cleaning the perforated bed, checking vibration mechanisms, and inspecting air distribution systems.

  2. Safety precautions

    Adhere to safety protocols when operating the dryer. Ensure proper grounding, follow electrical safety guidelines, and use appropriate personal protective equipment. Regularly inspect safety features and address any potential hazards promptly.

  3. Operational tips for optimal performance

     Optimize the drying process by adjusting parameters such as vibration intensity, airflow rates, and temperature. Regularly monitor and control these parameters to achieve the desired drying results.

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