1000-Pressure Spray Dryer for Malto-dextrin

1000-Pressure Spray Dryer for Malto-dextrin

Description of selection

At the beginning of the selection

LPG-250 centrifugal spray drying unit

Heating system: saturated steam + electric heating compensation

Fine powder collection system: first stage cyclone collector

Fine powder collection system: secondary cyclone collector

Medium circulation system: open circulation of induced draft fan

Air filtration system: initial effect。

Feeding system: screw pump adjustable feeding

Control system: instrument display temperature, differential pressure inlet and outlet air temperature automatic control material liquid automatic control。

Three, equipment technical parameters table

Water evaporation (water evaporation) 280Kg/h (set)

Tower diameter/tower height Outer diameter 4.2m/total height 9.5m

Operating temperature Inlet temperature 200/ outlet temperature 100

Mechanical centrifugal atomizer domestic well-known brand

Installed power drive 70KW,

Electric heating compensation 150KW;

Gas consumption is about 0.6m3/min

Water consumption 500kg/h (for cleaning)

Drying system in the form of open circulation system

Feeding mode screw pump stable feeding

Hot air contact mode parallel flow mode

Heat source steam + electric heating compensation

Product collection method cyclone dust collector

Atomization method: Mechanical centrifugal atomization

Control mode: set and control air inlet temperature arbitrarily, display temperature, pressure difference flow control

Iv. Description of equipment mechanism performance

The spray drying system includes the following

1. Feeding system

2. Hot air system

3. Drying system

4. Dust removal system

5. Exhaust system

6. Control system

1. Feeding system

The mixing tank is 800L, and the part in contact with the material is 304 stainless steel.

Form: vertical

Volume: 800 l

Power: 2.2 kw

Material: The part in contact with material is 304 stainless steel.

1.2, feed pump form: screw pump

Power: 3.0 Kw

Structural material: the part in contact with the material is 304 stainless steel

1.3. Feeding pipeline

Supply feed line from feed pump to drying tower.

Unit: 1 set

Material: 304 stainless steel

2. Hot air system

2.1. The primary air filter provides the required amount of clean air filtration before spray drying: 25000m3/h (Max)

Material: the filter material is non-woven fabric

2.2. The form of air supply fan used for conveying air: centrifugal power: 11KW

Model: 4-79-4.5A

Air volume: 6600-12500m3/h

Air pressure: 1600-2600PA /h

Accessories: air regulating valve and shock cushion

2.3, steam heat exchanger + electric compensation

heat transfer area: 480m2 + electric heating

power: 150KW (control cabinet stability control)

Material: carbon steel tube fin aluminum

2.4 Hot air pipe The hot air pipe is used to connect the heater outlet to the top of the drying tower.

The hot air is heated in the pipe.

The exterior is 304 stainless steel board, the inner wall is 304 stainless steel after high temperature and high efficiency filter, and the insulation material is rock wool.

3. Drying system

3.1 Hot Air Distributor The hot air distributor is on the top of the drying tower to provide stable hot air for the drying tower.

Form: special dispenser

quantity: three layers

material: 304 stainless steel

3.2 drying tower body A tall cylindrical cylinder with a conical body at the bottom is used for spray drying. The tower body has hot air inlet and outlet, inspection cleaning mouth, observation hole, lighting hole, etc.

The tapered part is also equipped with a knocking device.

The entire tower body is mounted on a bracket.

Diameter of tower body: inner diameter φ4000,

outer diameter φ4200

Total height: ~ 9500

Inner wall of the tower: δ3.0mm

Stainless steel 304

Outer wall of the tower: 304 stainless steel insulation

Thermal insulation layer

Material: rock wool

Thickness: 100

Observation door: 2, view mirror: 2,

Lighting: 2

Vibration device: 3

Cone bottom: 1

Material: 304 stainless steel

4. Dust removal system

A device for removing fine dust from the tail gas of a drying tower.

4.1 cyclone collector

Quantity: 2 PCS

Diameter: φ850 (first class + second class)

Material: Stainless steel 304, δ2mm

4.2. Commutator

Unit: Each

Material: Stainless steel 304, δ2mm

4.3 Star type feeding valve

Material: stainless steel 304, φ 200/1.1kW 4.4,

Duct material: stainless steel 304, δ2.0mm 4.5,

Water film dust collector size: φ 1500×6500

Description: spiral nozzle, two layer spray pipe

Material: pump head 304 stainless steel

Water pump power: 3.0 kW

5. Exhaust system

5.1 Air blower The device used to generate the air volume required by the whole spray drying.

Form: centrifugal

Models: the 9-26-9 D

Power: 45KW (+ frequency converter)

Quantity: 12500-19700 m3 / h

Wind: 4000-5000 pa/h

Connection mode: direct connection

Accessories: air regulating valve, shockproof pad

Material: Carbon steel

5.2. The air is discharged to the air pipe of the spray tower

Material: SUS304

6. Control system

Electric control box

Material: plastic spray

Electrical control system configuration description:

1. PLC control.

2. Outlet air temperature and feed quantity chain control

Working principle of centrifugal spray drying system:

Unlike pressure spray drying systems, it uses a centrifugal disk atomizer. The centrifugal disk nebulizer is installed on the upper part of the spray tower, and the mud pump sends the mud that needs to be dried into a high trough with a certain height located on the top of the tower. Under the action of gravity, the mud flows naturally into the center of the centrifugal disk nebulizer in the tower through the slurry outlet pipe. The centrifugal disk rotates at a high speed of 4000~20000r/min driven by the motor. When the mud flows to the edge through the groove or nozzle hole on the centrifugal disk, it obtains a high tangential linear velocity. Once it leaves the centrifugal disk, it is immediately fricted and torn by air, and atomized into mud droplets. The hot AIR DISCHARGED from the air HEATER is sent to the hot air distribution chamber located at the top of the tower through the hot air pipeline, which contacts with the mud droplets in the way of downstream flow, and dries the mud into powder suitable for dry pressing molding, which falls on the lower cone of the spray tower. The dry exhaust gas is extracted from the air outlet located at the lower part of the cone, and the fine powder is recovered by the dust collector, and the purified gas is discharged into the atmosphere by the exhaust fan

Matters needing attention

Technological requirements of spray droplet size should be uniform, in order to achieve the purpose of uniform drying, to obtain a uniform droplets, must reduce the vibration of the disc rotates, enter the liquid quantity in unit time constant of the disc, the disc surface level off is smooth, the circumference of the disc rate shoulds not be too small, the circumference of 60 m/s speed is the minimum value industry can be used. For example, 100~160m/s is generally used in the dairy industry. Practice has proved that when the circumference velocity of the centrifugal plate is too small (less than 60m/s), the spray droplets obtained are not uniform. The spray distance is mainly composed of a group of coarse droplets and a group of fine droplets that sink close to the plate. The distance between the main coarse and fine droplets is also reduced. When the circumferential velocity starts to reach 60m/s, the above divergence does not occur. Industrial disk diameter is usually between 160~500mm, the speed is 3000~20000r/min, there are more than 20000r/min above, the circumference speed is generally controlled between 75~170m/s