Egg white spray dryer

Egg white Spray Dryer

1. Parameters and requirements provided by customers:

1. Material name: egg white

2. Processing capacity: 2000 Kg/12h

3. Raw material moisture content: 75%, product moisture content: 15%

4. Evaporated moisture: 120Kg/h

5. Inlet air temperature: 150℃, exhaust air temperature: 80℃

6. Heating method: steam

7. Product collection: cyclone + bag filter

8. Equipment material: stainless steel at the material contact point

2. Determination of process parameters:

1. Hot air parameters:

Normal temperature: t0=15℃, inlet air temperature: t1=150℃, exhaust air temperature: t2=80℃

Air moisture content: d0=0.01kg water/kg dry air

2. Material parameters:

Processing capacity: W processing = 170 Kg/h

Raw material moisture content: ω1=75%, product moisture content: ω1=15%

Raw material temperature: θ1=10℃, product temperature after drying: θ2=~50℃

3. Material balance:

1. Dehydration amount: W water = W treatment × (ω1-ω2)/(1-ω2) = 120 ㎏/h

2. Output: W = 170-120 = 50 ㎏/h

4. Heat balance calculation and air volume calculation:

1. Heat required for dehydration: Q1=74520 kCal/h

2. Heat required to heat up the product: Q2=800 kCal/h

3. Equipment heat loss (take the peripheral heat loss in the drying process as 15%): Q3=11298 kCal/h

4. Hot air volume: L=(Q1+Q2+Q3)/(I1-I2′)=5061 kg/h

5. Check calculation of exhaust air parameters: Exhaust air humidity content: d2=0.01+120/5061=0.0337 kg water/kg dry air

5. Related design of spray drying tower:

1. Selection of spray head:

According to parameters: (spray volume: 170 Kg/h, solid content: 25%)

The selected nozzle model is: JGP-100-2.2 Kw

Atomizing disc diameter: d=120mm, rotating speed: 17600r/min, processing capacity: ~200 Kg/h

Lubrication cooling: forced external circulation pump oil cooling

2. After preliminary calculation, the diameter of the drying tower: D'=3.5 m

3. Calculation of drying tower height:

Height of cylinder section: H1=3.66m, height of cone section: H2=2.75m, height of top guardrail: H3=1.2m

4. Check the rationality of the drying tower size from the drying strength:

(1) Calculation of drying tower volume:

Volume of cylindrical segment: A1=35.2 m3, volume of conical segment: A2=9.8 m3

Total volume: A=A1+A2=45m3

(2) Value of drying strength:

From the "Encyclopedia of Spray Drying Practical Technology", it can be known that the drying strength is calculated by the following formula:

E=[(t1+273)3.4287]/[(t2+273)3.34]=(150+273)3.4287/(80+273)3.34=3.12kg water/m3·h

The actual value should be 0.9 times the calculated value (due to the low wind temperature), then E=2.8 water/m3·h

Actual dehydration capacity: W water=E×A=2.8×45=126 Kg water/h>120 Kg water/h

It can be seen from the verification of drying strength that the drying volume can meet the actual dehydration requirements of drying.