Sodium benzoate drum scraper dryer

Oct 26, 2025

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I. Process Conditions

1. Material Name: Sodium Benzoate

2. Initial Moisture Content (Wet Basis): 65%

3. Final Moisture Content (Wet Basis): ≤1.0%

4. Dry Product Yield: 5,000,000 T/year

5. Specific Gravity of Liquid: ~1100 kg/m³

6. Bulk Gravity of Dry Product: ~800 kg/m³

7. Viscosity: Yes

8. Heating Temperature: 140-160℃

9. Steam Pressure: 0.6 MPa

10. Heating Method: Steam

11. Equipment Material: 321 for material contact areas, Q235-A for other parts

12. Drying Method: Drum scraper dryer

13. Power Supply: 380V 50HZ

14. Installation: Indoor

II. Calculation (Theoretical)

1. Dry Product Output: 695 kg/h

2. Moisture Evaporation Rate: ≈1599 kg/h

3. Wet Processing Rate: 2294 kg/h

4. Calculation of Heating Area:

Heat required for moisture evaporation: Q1 = 951405 kcal/h

Heat required for material temperature rise: Q2 = 22240 kcal/h

Equipment heat loss (10%)

Q3 = 97365 kcal/h

Therefore: Q_total = 951405 + 22240 + 97365 = 107 1010 kcal/h

Steam consumption: 2142 kg/h

Drying area: A ≈ 62.6 m²

Considering processing capacity, single drum model: HG-φ2000×3000

Effective heating area: 3.14 × 2.0 × 3 × 0.75 = 14.13 m² (effective area accounts for 75% of the total area)

Number of drums needed: 62.6 ÷ 14.13 = 4.4 (Round to 5)

5. Drying intensity calculation: (At 200℃, the drying intensity is generally 15-30 kg/m²h)

The total effective area of 5 drums (φ2.0×3) is: 14.13 × 5 = 70.65 m²

Then the drying intensity is: 1599 ÷ 70.65 = 22.63 The required water volume (kg/m²h) meets the requirements.

6. Calculation of wet processing capacity:

Main unit speed: 1-5 rpm, calculated at 1.5 rpm.

Film thickness: 0.3-1.5 mm, calculated at 0.5 mm.

Specific gravity of liquid: 1100 kg/m³

Therefore: The processing capacity of each drum is: 2294 ÷ 5 = 459 kg

3.14 × 2.0 × 3 × (0.5 ÷ 1000) × 1.5 × 60 × 1100 × 0.75 = 699 kg/h > 459 kg/h

Meets design requirements.

Summary: Based on the above calculations, it is recommended to select 5 HGφ2000x3000 type drum scraper dryers to meet the requirements.

III. Working Principle

1. High operational flexibility and wide adaptability: The drum dryer has a high operational flexibility. 1. **Many Factors Affecting Drum Drying:** Changing one of the many factors influencing drum drying will not affect the drying operation of other factors. For example, the main factors affecting drum drying include heating medium temperature, material properties, film thickness, and drum rotation speed. Changing any one of these parameters will directly affect the drying rate, while the factors are unrelated. This makes drum drying operation very convenient, allowing it to adapt to various materials and different production volumes.

2. **High Thermal Efficiency of Drum Drying:** The thermal efficiency of drum drying is approximately 80% to 90%. This is because the heat transfer mechanism of drum drying is heat conduction, and the heat transfer direction remains consistent throughout the entire operation cycle. Except for heat loss through end caps and thermal radiation, the remaining heat is used for moisture evaporation from the film on the outer wall of the drum.

3. **Short Drying Time:** The wet film formed on the outer wall of the drum at the beginning of drying is generally 0.3–1.5 mm, and the entire drying cycle only takes 10–60 seconds. After the wet material has lost moisture, it is unloaded by a scraper, making drum dryers suitable for viscous slurry materials. Drying this type of material is difficult using other drying equipment.

4. High drying rate: Due to the thin material film and the consistent direction of heat and mass transfer, the surface of the material film can maintain 15-30 kg H2O (m².h).

5. Continuous operation, stable quality, labor saving, and the ability to obtain uniform products;

Easy to clean inside the machine, easy to change product types;

The exhaust gas does not carry away the material, eliminating the need for dust removal equipment.

IV. Main Technical Parameters: (Single Unit)

1. Model: HG φ2000×3000

2. Effective outer diameter of the drum: φ2000 mm

3. Effective length of the drum: 3000 mm

4. Material thickness: 0.3-1.5 mm

5. Feeding method: Bottom feeding.

6. Drying intensity: 12-20 kg water/m².h

7. Main machine speed: 1-5 rpm

8. Effective drying area: 14.13 m²