Hollow Paddle Dryer | Paddle Dryer | Hollow Paddle Dryer
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Company: Changzhou Lima Drying Technology Co., Ltd.
Contact: Zhou Youlai 13806118222
Phone: 0519-88968880
Fax: 0519-88968686
Mobile: 13806118222 18136711288
Address of Company: No. 11 Jinhua Road, Wujin District, Changzhou City, Jiangsu Province
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company ⎝⎛体育滚球平台⎞⎠

Hollow Paddle Dryer

  • Product Name: Hollow Paddle Dryer
  • Product model: KJG
Product details:

Hollow paddle dryer is a horizontal stirring type continuous drying equipment mainly based on heat conduction. Because the stirring blade is shaped like a ship's paddle, it is called a paddle dryer, and it is also called a trough dryer or agitator dryer abroad.

Because the heat required for the equipment to dry is indirectly heated by heat conduction, no or a small amount of gas is needed to remove moisture during the drying process. It greatly reduces the heat loss carried by the air flow and improves the heat utilization rate. It is an energy-saving drying equipment. Paddle dryers are widely used for drying powdery, granular, filter cake, and slurry materials in petrochemical, chemical, metallurgical, food, pharmaceutical, and pesticide industries.

Changzhou Lima Drying Engineering Co., Ltd. improves and optimizes the design of the wedge-shaped hollow paddle dryer on the basis of absorbing advanced technology at home and abroad. Unit operations such as drying, cooling, heating, sterilization, reaction, and low-temperature calcination can be completed. The special wedge-shaped stirring heat transfer paddle in the equipment has high heat transfer efficiency and self-cleaning function of the heat transfer surface.

I. Working principle:

The heat transfer surface of the hollow blade dryer includes blades, stirring shafts, and wall surfaces, and the heat transfer area of the blades accounts for a large part, so the equipment structure is compact and the heat transfer area per unit volume is large. In addition, stirring and mixing cause the materials to turn violently, thereby obtaining a high heat transfer coefficient, so the footprint and space are very small, which saves the plant infrastructure construction costs. During the drying process, the amount of gas used is small, the flow rate is low, and the amount of dust carried away by the gas is small. Therefore, the gas dust is easily recovered after drying, and the recovery equipment is small in size, which can save equipment investment. For drying processes that require solvent recovery, the solvent concentration can be greatly increased. Due to the special blade structure, the materials are alternately squeezed and relaxed during the drying process, which strengthens the drying. The filling rate of the material in the drying chamber is very high, which can reach 80% -90%. The residence time of the material can be adjusted by adjusting the feeding speed, the rotation speed of the stirring shaft, and the fullness of the material, which can be adjusted from minutes to hours. In addition, the movement of the material from the feeding port to the discharging port in the dryer is basically a piston movement, and the distribution of the residence time is narrow, so the moisture content of the product is uniform. The blade has a certain axial angle on the stirring shaft, so the material can be continuously dried.

Equipment structure:

Take the double shaft type as an example to introduce its structure (the hollow blade dryer can be divided into single, double and four). It consists of a jacketed end with a W-shaped housing, an upper cover, two hollow shafts with blades, end covers at both ends, a rotary joint with a medium, a metal hose, and a transmission mechanism including gears and sprockets. composition.

The core of the equipment is two hollow shafts and hollow stirring blades welded to the shaft. The blade shape is a wedge-shaped hollow semi-circular, which can pass into the heating medium. In addition to stirring, it is also the heat transfer body of the equipment. The two main heat transfer sides of the blade are inclined. Therefore, when the material is in contact with the inclined surface, as the blade rotates, the particles will quickly slide away from the inclined surface, so that the heat transfer surface is constantly updated and the heat transfer is enhanced. A scraper is arranged on the triangular bottom of the blade to scrape the material deposited on the bottom of the shell to prevent dead corners.

There are certain requirements for the arrangement of the paddles and the size of each part. In addition to the paddles in the feed area, drying area, and discharge area, there are auxiliary mechanisms to ensure stable operation and uniform drying of the machine. In addition, the dwell time can be adjusted.

Third, equipment characteristics:

The main features of the paddle dryer are:

1.Compact equipment structure, large effective heat transfer area, small footprint

2.Stir evenly, high thermal efficiency and good drying effect

3. The paddle shafts can mesh with each other and have a self-cleaning effect to prevent materials from sticking to the wall

4. Low energy consumption and small operation cost

5, small dust entrainment, less material loss

6.Indirect heating, non-polluting materials

7, the blade shaft speed is low, does not damage the product shape and properties

8. The equipment is flexible in operation and runs smoothly and reliably.

Application:

The paddle dryer has been successfully used in food, chemical, petrochemical, dye, industrial sludge and other fields. The characteristics of heat transfer, cooling and stirring of the equipment make it possible to complete the following unit operations: calcination (low temperature), cooling, drying (solvent recovery), heating (melting), reaction and sterilization. The stirring blade is also a heat transfer surface, which increases the heat transfer area in the effective volume per unit and shortens the processing time. The wedge-shaped blade heat transfer surface is self-cleaning. Compression-expansion mixing function makes the materials mix evenly. The material moves in a "piston flow" along the axial direction. In the axial interval, the temperature, humidity and mixing gradient of the material are small.

Using heat-conducting oil as the heat medium, the paddle dryer can complete the low-temperature calcination work. Such as: calcination of calcium sulfate dihydrate (CaSO4 · 2H2O) into calcium sulfate hemihydrate (CaSO4 · 1 / 2H2O). Sodium bicarbonate (NaHCO3) is converted into soda ash (Na2CO3) by calcination.

Cooling medium, such as water, cooling brine, can be used for cooling. For example: used in the soda industry, the paddle-type cool soda machine replaces the old-fashioned air-cooled cool soda machine, which saves energy and exhaust gas treatment equipment and reduces operating costs. Cooling of the material. In a single machine, the material can be cooled from 1000 ° C to less than 40 ° C.

Drying, the main function of the equipment, does not use hot air, making the solvent recovery, energy consumption, and environmental control in an ideal state that is easy to handle. It is especially suitable for solvents that need to be recovered and flammable and oxidizable heat-sensitive materials. It has been widely used in fine chemical, petrochemical and dye industries.

The homogeneity of temperature, humidity, and mixing degree in the axial section makes the equipment available for heating or melting, or for some solid material reactions. It has been successfully used in compound fertilizer and modified starch industries. Paddle dryers can be used to sterilize food and flour. The large heating area within the effective volume of the unit quickly heats the material to the sterilization temperature, avoiding long-term heating and changing the quality of the material.

V. Adapted materials 1. Petrochemical industry: polyolefin powder, polycarbonate resin, high and low density polyethylene, linear low density polyethylene, polyacetal particles, nylon 6, nylon 66, nylon 12, acetate fiber, Polyphenylene sulfide, propylene-based resin, engineering plastics, polyvinyl chloride, polyvinyl alcohol, polystyrene, polypropylene, polyester, polyoxymethylene, styrene-acrylonitrile copolymerization, and ethylene-propylene copolymerization.

2. Environmental protection industry: PTA sludge, electroplating sewage sludge, boiler soot, pharmaceutical factory waste residue, sugar factory waste residue, MSG factory waste residue, coal ash.

3. Feed industry: soy sauce residue, bone-based feed, distiller's grains, food scraps, apple dregs, orange peel, soybean meal, chicken bone feed, fish meal, feed additives, bio-slag mud.

4. Food industry: starch, cocoa beans, corn kernels, salt, modified starch, medicines.

5. Chemical industry: soda ash, NPK compound fertilizer, kaolin, bentonite, white carbon black, carbon black, phosphogypsum, sodium oxide fluoride, nitric acid, calcium, magnesium carbonate, sodium cyanide, aluminum hydroxide, barium sulfate, Calcium sulfate, calcium carbonate, dyes, molecular sieves, saponins.

六 、 Characteristic parameter table

Type

KJG-2.7

KJG-9

KJG-13

KJG-18

KJG-24

KJG-29

KJG-36

KJG-41

Heat transfer area m2

2.7

9

13

18

twenty four

29

36

41

Effective volume m3

0.06

0.32

0.59

1.09

1.53

1.85

2.42

2.8

Speed range rpm

15-30

10-25

10-25

10-20

10-20

10-20

10-20

10-20

Kw

2.2

4.0

5.5

7.5

11

11

15

15

Body width A mm

306

584

762

940

1118

1118

1296

1296

Overall width B mm

736

841

1066

1320

1474

1474

1676

1676

Body length C mm

1956

2820

3048

3328

3454

4114

4115

4724

Overall length D mm

2972

4876

5486

5918

6147

6808

6960

7570

Feed distance E mm

1752

2540

2768

3048

3150

3810

3810

4420

Center height F mm

380

380

534

610

762

762

915

915

Total height G mm

762

838

1092

1270

1524

1524

1778

1778

Steam inlet N inch

(2) 3/4

(2) 3/4

(twenty one

(twenty one

(twenty one

(twenty one

(twenty one

(twenty one

Outlet O inch

(2) 3/4

(2) 3/4

(twenty one

(twenty one

(twenty one

(twenty one

(twenty one

(twenty one

Type

KJG-48

KJG-52

KJG-62

KJG-68

KJG-73

KJG-81

KJG-87

KJG-95

KJG-110

Heat transfer area m2

48

52

62

68

73

81

87

95

110

Effective volume m3

3.54

3.96

4.79

5.21

5.78

6.43

7.39

8.07

9.46

Speed range rpm

10-20

10-20

10-20

10-20

5-15

5-15

5-15

5-15

5-10

Kw

30

30

45

45

55

55

75

75

95

Body width A mm

1474

1474

1651

1652

1828

1828

2032

2032

2210

Overall width B mm

1854

1854

2134

2134

2286

2286

2438

2438

2668

Body length C mm

4724

5258

5410

5842

5461

6020

5537

6124

6122

Overall length D mm

7772

8306

8865

9296

9119

9678

9119

9704

9880

Feed distance E mm

4420

4954

4953

5384

5004

5562

5080

5664

5664

Center height F mm

1066

1066

1220

1220

1220

1220

1220

1220

1220

Total height G mm

2032

2032

2362

2362

2464

2464

2566

2566

2668

Steam inlet N inch

(2) 11/2

(2) 11/2

(2) 11/2

(2) 11/2

(2) 11/2

(2) 11/2

(2) 2

(2) 2

(2) 2

Outlet O inch

(2) 11/2

(2) 11/2

(2) 11/2

(2) 11/2

(2) 11/2

(2) 11/2

(2) 2

(2) 2

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