Working principle and advantages of continuous mesh belt dryer for yam tablets

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Jiutian

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Sep 6, 2024

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To buy a yam slice dryer, you can choose a multi-layer mesh belt yam slice dryer, which adopts a multi-layer flip structure, and uses the pure hot air generated by the heat source to dry layer by layer in the drying box, and the drying effect is good.

The working principle of the continuous mesh belt dryer for yam slices: the fresh yam slices are transported to the bottom of the drying box through the conveyor belt, and fall down layer by layer in an “s” shape. There is a material blocking device between the layers. Prevent the yam pieces from falling directly to the bottom. The heat source blows the hot air into the bottom of the drying box under the action of the fan, and the hot air passes through the mesh belt layer by layer, takes away the moisture in the yam slices, and discharges from the top, which is a cycle process.

Advantages of yam tablet mesh belt dryer:

1. Save labor, the equipment adopts continuous drying, 2–3 people are enough for the whole set of equipment.

2. The drying temperature and operating speed are controllable, which can be controlled through the power distribution cabinet according to different materials.

3. The heat source can be coal, wood, natural gas, diesel, air energy heat pump, etc. Customers can choose according to the actual local conditions and their own.

4. Clean and hygienic, the mesh belt in contact with the material is made of 304 stainless steel.

5. Compared with traditional dryers, mesh belt dryers can be used for continuous production with higher efficiency.

6. The mesh belt dryer is a low-speed drying, and the whole set of equipment has almost no wearing parts.

If you are interested in our mesh belt dryer, please feel free to contact us.

https://www.jiutian-dryer.com/product/other/54.html

Working Principle

The mesh belt dryer is a continuous production drying equipment. The main heating methods are electric heating, steam heating and hot air heating. The main principle is to spread the material evenly on the mesh belt. The mesh belt is made of 12-60 steel mesh belt, which is dragged by the transmission device to move back and forth in the dryer. The drying machine is discharged from the moisture exhaust hole to achieve the purpose of drying. The length of the box is composed of standard sections. In order to save space, the dryer can be made into a multi-layer type. 6-40m, effective width 0.6-3.0m.

The whole equipment consists of feeding system, hot air system, discharge system, and moisture discharge system.

The charging system makes the materials evenly dispersed on the screen plate and conveyed to the drying section at a uniform speed. The hot air system is to provide the heat source required for drying, providing 80~120℃ hot air to the drying chamber. When the conveyor belt passes through, the hot air passes through the materials on the conveyor belt from top to bottom or from bottom to top so that the materials can be dried evenly and finally discharged by the discharge system.

Applications

Conveyor mesh belt dryer is a commonly used continuous drying equipment, which can be widely used in chemical, food, medicine, building materials, electronics and other industries, especially suitable for drying sheet, strip and granular materials with good ventilation. Paste-like materials such as filter cakes can also be dried after being formed by a granulator or an extruder.

Technical Parameters

Model DW-1.2-8A DE-1.2-10A DW-2.0-8A DW-2.0-10A Quantity of unit 4 5 4 5 Length of the drying section 8M 10M 8M 10M Operation temperature 50-140℃ Steam pressure 0.2-0.8Mpa Steam consumption 120-300kg/h 150-375kg/h 180-500kg/h 225-600kg/h Drying time 0.2-1.2h 0.25-1.5h 0.2-1.2h 0.25-1.5h Drying strength 6-30kg.h2o/㎡.h Power 11.4kw 13.6kw 12.5kw 14.7kw Model DW3-1.2-8B DW3-1.2-10B DW3-2.0-8B DW3-2.0-10B Quantity of unit 8 10 8 10 Length of the drying section 24M 30M 24M 30M Operation temperature 50-140℃ Steam pressure 0.2-0.8Mpa Steam consumption 240-550kg/h 300-750kg/h 350-1000kg/h 400-1200kg/h Drying time 0.2-1.2h 0.25-1.5h 0.2-1.2h 0.25-1.5h Drying strength 6-30kg.h2o/㎡.h Power 21.7kw 26.1kw 29.2kw 35.2kw

Our Mesh Belt Dryer Projects (Vegetable & Seaweed)

I: Drying Solutions for Vegetable Dehydration

Customer's Material & Related Parameters

Material

Vegetable

Initial Moisture w1

70~80%

Final Moisture w2

12%

Capacity

1200Kg/h

Bulk density of wet materials

ρ=800kg/m3

Material Specific Heat

0.5Kcal/kg-℃

Material Temperature t0

20℃ 

Heating Method

Electric heating / charcoal

Drying Temperature t1

80~120℃

Drainage Temperature t2

60℃

1. Mesh Belt Dryer Model Selection for Vegetable Dehydration

Heat balance calculation: Take the average local temperature as t0=20℃, air moisture content as d0=0.01Kg/Kg dry air.

1. Required dry moisture: W=600×(80-3)/(100-80)=2310kg/h.
2. Heat required for moisture evaporation: Q1=W (595+0.45t2- t0)=1392000Kcal/h.
3. Heat required for material warming: Q2= W2 [0.5(1- w2) + w2](t2- t0) = 47600Kcal/h.
4. Heat required for system loss: Q3= (0.15 ~ 0.2) × (Q1+ Q2) = 220,000Kcal/h.
5. Mass flow rate of drying hot air: M=( Q1+ Q2+ Q3) ÷ [(0.24+0.45 d0)( t1- t2)-0.1×0.24(t2- t0)] ≈ 121,000Kg/h.
6. Provide total heat: Q0=M(0.24+0.45 d0)(t1- t0)=2958450K cal/h.
7. Check the reasonableness of the set exhaust air temperature: Exhaust air moisture content: d2 = d1 + W water / G = 0.01 + 2310/121000 = 0.03kg water / kg dry gas, check the air enthalpy wet diagram can be found in the corresponding dew point temperature t dew = 31.64 ℃, then t2 – t dew = 28 ℃ > 20 ℃, to ensure that the exhaust air does not condense.

Due to the nature of the material, we decided to choose a set of DW5-2.25X20 five-layer mesh belt dryer (each layer is 20m long and 2.25m wide).

2. Fan Selection

• Circulating fan: 4-72-6c-11kw Air volume: 18000m3/h Air pressure: 1200pa.
• Dehumidification fan: 4-72-8C-30kw Air volume: 30000m3/h Wind pressure: 900pa.

3. Equipment Introduction

• Equipment material: The whole equipment adopts steel frame structure, the outer wall is made of stainless steel plate and the inner wall is stainless steel. The 1, 2, 3, 4 and 5 layers of mesh belts are made of stainless steel. The spreader bar and protective cover of the mesh belt are all stainless steel. The chain, sprocket, track, circulating fan and moisture exhaust fan of the mesh belt are made of carbon steel.
• Feeding method: The screw conveyor is used to lift the material to the first layer.
• Heating method: steam heating, heat exchange by carbon steel column fin radiator, the temperature of each unit can be set and controlled independently.
• Transmission device: The transmission device has a large reduction ratio, so that the drying time can be controlled in 2~3 hours to improve the applicable range of the equipment.

4. Parameters of DW5-2.25X20 Mesh Belt Dryer for Vegetables Dehydration

DW5-2.25X20 Mesh Belt Dryer Technical Parameters

Drying Material

Vegetable

Machine Model

DW5-2.25X20

Machine Number

1 set

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Mesh Belt Width

2.25m

Layers of Mesh Belt

5

length of Drying Section

100m

Number of Drying Units

10

Effective Drying Area

225 m2

Inlet Air Temperature

80~120℃

Exhaust Temperature

60℃

Drying Time

2 hours

Machine Power

217Kw

Dimension of Main Machine

24400X3165X4750mm

II: Drying Solutions for Seaweed (carrageenan)

Customer's Material & Related Parameters

Material

Seaweed

Initial Moisture w1

90%

Final Moisture w2

12~ 14%

Capability

100~200 kg/h (200kg/h for design)

Heating Method

Steam

Steam Pressure

0.5MPA

Drying Temperature t1

110～120℃ (115°C for design)

Drainage Temperature t2

70～80℃ (75°C for design)

1. Mesh Belt Dryer Model Selection for Seaweed Drying

Heat balance calculation: Take the average local temperature as t0=20℃, air moisture content as d0=0.01Kg/Kg dry air.

• Required dry moisture: W=200×(90%-12%)/(1-12%)=178kg/h.
• Heat required for evaporation of moisture: Q1=178×(595+0.45×75-20)≈10.8×104Kcal/h.
• Heat required for material warming: Q2=200×(0.4×(1-15%)+15%)×(60-20)≈0.4×104Kcal/h.
• Heat required for system loss: Q3=0.15×(10.8+0.4)×104≈1.68×104Kcal/h.
• Required air volume of the system: LG=(Q1+Q2+Q3)/[(0.24+0.45×0.011)(115-75)-0.1×0.24(75-20)]=11162kg/h.
• Total heat provided by heat source: Q0=11162×(0.24+0.45×0.011)(115-20)≈26×104Kcal/h.

Exhaust emission verification: With the machine exhaust moisture tail gas moisture content Hs: Hs = 0.011 + 178/11162 ≈ 0.026Kg/Kg dry air. According to the above parameters to check the air enthalpy and humidity diagram: air moisture content of 0.026Kg/kg dry air; dry bulb temperature of 75 ℃; air relative humidity of 3.53%; wet bulb temperature of 42 ℃; dew point of 27 ℃; dry, wet bulb temperature difference Δt = 75-42 = 33 ℃ > 20 ℃, regarded as a reasonable temperature setting for moisture discharge.

According to our company’s experience in using equipment in similar industries, the average drying intensity of mesh belt dryer is 10-15Kg water/m2.h. The design is taken as 12Kg water/m2-h, then the effective area of drying required A: A=178/12≈15m2. Combined with the above calculation, DW1.5×10 belt dryer is selected for production.

2. Parameters of DW1.5×10 Mesh Belt Dryer for Seaweed Drying

DW1.5×10 Mesh Belt Dryer Technical Parameters

Drying Material

Seaweed (carrageenan)

Machine Model

DW1.5×10

Machine Number

1 set

Mesh Belt Width

1.5m

length of Drying Section

10m

Effective Drying Area

15 m2

Inlet Air Temperature

110～120℃

Dehumidification Temperature

70～80℃

Equipment Weight

6 tons/set

Dimension of Main Machine

12000X2100X2800mm

Contact us to discuss your requirements of Mushroom Grinding Machine. Our experienced sales team can help you identify the options that best suit your needs.