Centrifugal spray dryer sent to customer site in Chengdu

working principle

After passing through the filter and heating device, the air enters the hot air distributor at the top of the drying chamber,

The hot air through the hot air distributor enters the drying chamber uniformly in a spiral shape, while the material

The liquid is transported by the feed pump to the centrifugal atomizer installed at the top of the drying chamber. The liquid material is dispersed

Form extremely small mist like droplets, greatly increasing the surface area of the material liquid in contact with hot air.

Water evaporates rapidly in a very short period of time and is dried into powder or granular products, small liquids

Droplets and hot air flow together and sink, collecting materials from the bottom of the tower and passing through cyclone separators and bag filters for dust removal

Capture, exhaust gas is discharged to the outside by the induced draft fan.

Characteristics and Application of Centrifugal spray Dryer

1Fast drying speed. After centrifugal spray, the surface area of the feed liquid is greatly increased

It can evaporate instantly in the flowWith 95-98% moisture, the drying process can be completed in just a few seconds.

IIThe parallel flow spray drying can make the droplets flow in the same direction as the hot air

The temperature of the wind is high, but due to the immediate contact between the hot air and the liquid droplets after entering the drying chamber, the temperature inside the tower is high

Rapid descent does not cause excessive heating of dry materials, making it particularly suitable for drying heat sensitive materials.

IIIWidely applicable. According to the characteristics of the material, it can be dried with hot air or cold air

Wind granulation. A large number of products with significant differences in characteristics can be produced using this equipment. Commonly used ones include:

Polymers and resins, dyes, pigments, ceramics, glass, rust removers, insecticides

Carbohydrates, dairy and egg products, tannic acids, by-products of slaughterhouses, blood and blood products

Detergents and surfactants, fertilizers, organic compounds, inorganic compounds, instant food, pharmaceuticals, etc.

4Due to the instantaneous completion of the drying process, the particles of the product basically maintain the approximate shape of liquid droplets

Spherical, with good dispersibility, fluidity, and solubility.

5The production process is simplified and the operation and control are convenient. Spray drying is generally suitable for moisture content40~60%

The solution of special materials, even if the content is as high as90% can also dry into powder products in one go, large

After some products are dried, there is no need for further crushing and screening, which reduces the production process and simplifies it

Improved the production process and enhanced the quality of the product. Regarding the particle size and bulk density of the product

Moisture content can be adjusted and controlled by changing operating conditions within a certain range. Management is very convenient.

VITo prevent material contamination and extend equipment lifespan. All parts in contact with materials

Made of stainless steel material. For the convenience of operation, the control system adopts integrated operation.

Installation of centrifugal spray dryer

1When installing the spray dryer, the level should be corrected, and the drying tower should be placed at an appropriate position

Install escalators and railings, work platforms, fans and atomizers, and cyclones according to the equipment installation diagram

Separators and heaters, etc（LPG-5 is manufactured as a whole.

IIConnect the power supply according to the electrical schematic diagram and install the electrical control cabinet in a convenient location for operation

Set. To ensure safe production, a grounding wire must be installed when installing this machine and electrical control cabinet.

IIIThe exhaust outlet of the centrifugal fan should be determined according to the specific conditions of the installation site

Household self allocation1: 4 exhaust pipes are used to direct exhaust gases out of the room and prevent an increase in indoor humidity.

At the same time, to reduce noise, a soundproof chamber can be added to the induced draft fan of large equipment according to their own requirements.

Use of centrifugal spray dryer

To ensure the quality of the product, it is necessary to thoroughly clean it before use and according to the product specifications

The requirement determines whether disinfection should be carried out.

1、 Before use, the following checks should be conducted

1All pipelines and drying towers should be cleaned and washed first during installation and connection

Is the sealing material installed at the joint and connected to ensure that unheated air enters

Enter the drying room.

2. Check if the doors and observation windows are closed and if there is any air leakage.

2The pollination tube at the bottom of the cyclone separator should be checked for sealing before installation. Pollinator tube

Must be clean and dry.

4. Check if the rotation direction of each motor is correct.

5. Is the connecting pipeline of the feed pump properly connected, and is the rotation direction of the motor and pump correct.

6. Whether the spray head on the top of the drying chamber is properly installed to avoid air leakage.

2、 Run

1Firstly, turn on the centrifugal fan, then turn on the heater, and check for any air leaks

Preheating can be carried out normally, as hot air preheating determines the evaporation capacity of the drying equipment

On the premise of not affecting the quality of the dried material, the inlet air temperature should be raised as much as possible.

2During preheating, place the atomizer at the top of the drying chamber, and discharge the material from the drying chamber and cyclone separator

The mouth must be sealed to prevent cold air from entering the drying chamber and reducing preheating efficiency.

3When the inlet temperature of the drying chamber reaches the set temperature, turn on the centrifugal nozzle, and when the spray nozzle

When the maximum speed is reached, start the feed pump and add clean water sprayReplace with in 10 minutes

The feeding amount of the liquid should be increased from small to large, otherwise wall sticking will occur until it is adjusted to an appropriate level

When requested. The concentration of the liquid should be prepared according to the drying properties of the material to ensure dryness

The dried product has good fluidity.

4The temperature and humidity of the dried product depend on the exhaust temperature. During operation, it is important to maintain

It is extremely important to maintain a constant exhaust temperature, which depends on the amount of feed

The material quantity is stable, and the outlet temperature is relatively stable. If the solid content and flow rate of the material liquid occur

When there is a change, the outlet temperature will also fluctuate.

5If the product temperature is too high, the amount of material added can be reduced to increase the outlet temperature and product temperature

If the degree is too low, then the opposite is true. For thermosensitive materials with lower product temperatures, the feeding amount can be increased,

To reduce the exhaust temperature, but the temperature of the product will correspondingly increase.

6Collect the dried finished product. In the pollinator at the bottom of the cyclone separator, unfilled

Before filling, it should be replaced. When replacing the pollinator, the butterfly valve on top must be closed before proceeding.

7If the dried product has hygroscopicity, the cyclone separator and its pipelines, as well as the pollinator, should be used

Apply insulation material to wrap the product, which can prevent moisture absorption from drying out.

For details, please refer to the operating instructions of spray drying tower.

3、 Clean up

1To ensure the cleanliness of the drying tower body, its pipelines, and all components in contact with the finished product

It is essential to have regular cleaning equipment for Liu's products.

2When the product is replaced or the equipment has been discontinuedFor those that have not been cleaned for more than 24 hours,

A comprehensive cleaning should be carried out.

3. Washing method

（1) Dry cleaning: Use brushes, brooms, and vacuum cleaners to clean.

（2) Wet cleaning: Clean with hot water at 60-80 ℃.

（3) Chemical cleaning: Clean with alkaline solution, acid solution, and various detergents.

Acid washing: adding nitric acid（NHO3) is prepared into a solution with a concentration of 1-2% and heated at a different temperature

exceedWash at 65 ℃ and then rinse with clean water.

Alkali washing: Sodium hydroxide（NaOH) preparation0.5~1%Concentrated solution, heated

toWash at 60-80 ℃, then rinse with water.

3After wet washing and chemical washing, the equipment and various components should be installed and subjected to high temperature

Warm disinfection, time15-30 minutes.

5. When cleaning this device, care should be taken not to use chlorine and its compounds for washing.

6. The cleaning of air filters should be based on the surrounding environmental conditions, that is, the high dust content in the air

Low but generally high contentClean once every 3-6 weeks, and clean 6-8 weeks for low dust content

once

8The stainless steel wire, after being washed with alkali washing method, should still be evenly laid in the air

Spray light spindle oil and vacuum pump oil inside the frame of the filter.

Maintenance of centrifugal nozzle

To ensure smooth operation of the centrifugal nozzle under high-speed rotation, maintenance is particularly important.

1If there is any noise or vibration during the use of the nozzle, it should be stopped immediately and the nozzle should be removed for inspection

Check whether there are residual substances in the spray tray, and if there are, clean it in time.

2Check for any abnormalities in bearings, bushings, shafts, gears, and other transmission components. If any are found,

Damaged components should be replaced promptly.

3The mechanical transmission nozzle uses high-speed gear rotation and must be continuously lubricated with high-speed coolant

Ground circulation cooling ensures good lubrication of gears, shafts, and bearings. (Hydraulic oil or ingot can be used)

The viscosity of the oil used should not be too high.

4To increase the service life of the nozzle, it is best to use it alternately and continuously20 hours or root

Rotate according to specific circumstances. The lubricating oil for rolling bearingsExchange every 150-200 hours.

When refueling, do not add too much, otherwise it will contaminate the product. Do not place the scale in the middle of the dipstick

Exceeding the highest scale line.

5After use, remove the spray tray, immerse it in water, and clean the residual substances with water

wash sth. clean. When it cannot be washed off with clean water, use a brush to scrub. Because of the residue on the spray tray

The residual material will bring about the imbalance of the spray tray, which will seriously affect the service life of the nozzle or even damage it

Damaging other components.

6When disassembling the spray head, be careful not to bend the main shaft, and control when installing the spray disk

The clearance between the disc and the shell, and the nuts fixing the spray disc must be tightened to prevent loosening and falling off.

7After the nozzle is working, it should not be placed horizontally during transportation. Incorrect placement can cause damage to the master

Axis bending affects usage. Place it on the appropriate fixed frame.

Please refer to the atomizer user manual for specific operating procedures.

Analysis of Possible Problems in Production

During the production process, abnormal phenomena may sometimes occur, especially when new equipment is running for the first time. If the operation is not proficient and the adjustment and control lack experience, it is more likely to cause some problems. The list of possible problems, their causes, and remedial measures is as follows:

table3 Operation reference table