In a tunnel washer system with no problem in the efficiency of the tunnel washer and water extraction press, if the efficiency of tumble dryers is low, then the overall efficiency will be difficult to improve. Nowadays, some laundry factories have increased the number of tumble dryers to handle this problem. However, this method is actually not worthwhile. Though the overall efficiency seems to be improved, energy consumption and power consumption have also increased, which contributes to the increasing energy costs. Our following article will discuss this in detail.
So, how many tumble dryers configured in a tunnel washer system can be considered to be reasonable? The calculation based on the formula is as follows. (Different moisture content after being dried from the water extraction press and differences in drying times for steam-heated tumble dryers should be considered).
Taking a laundry factory as an example, its working parameters are as follows:
Tunnel washer system configuration: one 16-chamber 60 kg tunnel washer.
Discharge time of a linen cake: 2 minutes/chamber.
Working hours: 10 hours/day.
Daily production: 18,000 kg.
Towel drying proportion: 40% (7,200 kg/day).
Linen ironing proportion: 60% (10,800 kg/day).
CLM 120 kg tumble dryers:
Towel drying and cooling down time: 28 minutes/time.
Time required to scatter the clumped sheets and quilt covers: 4 minutes/time.
The drying output of a tumble dryer: 60 minutes ÷ 28 minutes/time × 120 kg/time = 257 kg/hour.
The output of bed sheets and duvet covers that are scattered by a tumble dryer: 60 minutes ÷ 4 minutes/time × 60 kg/time = 900 kg/hour.
18,000 kg/day ×Towel drying proportion: 40% ÷ 10 hours/day ÷ 257 kg/unit = 2.8 units.
18000kg/day × Linen ironing proportion: 60% ÷10 hours/day÷900kg/machine=1.2 machines.
CLM total: 2.8 units for towel drying + 1.2 units for bedding scattering = 4 units.
Other brands (120 kg tumble dryers):
Towel drying time: 45 minutes/time.
Time required to scatter the clumped sheets and quilt covers: 4 minutes/time.
The drying output of a tumble dryer: 60 minutes÷45 minutes/time×120 kg/time=160 kg/hour.
The output of bed sheets and duvet covers that are scattered by a tumble dryer: 60 minutes ÷ 4 minutes/time × 60 kg/time = 900 kg/hour.
18,000 kg/day × Towel drying proportion: 40%÷ 10 hours/day ÷ 160 kg/unit = 4.5 units; 18,000 kg/day ×Linen ironing proportion: 60% ÷ 10 hours/day ÷ 900 kg/unit = 1.2 units.
Total of other brands: 4.5 units for towel drying + 1.2 units for bedding scattering = 5.7 units, i.e. 6 units (If the tumble dryer can only dry one cake at a time, the number of dryers cannot be less than 8).
From the above analysis, we can see that the efficiency of the dryer is closely related to the water extraction press in addition to its own reasons. Therefore, the efficiency of the tunnel washer system is interrelated and mutually influential with each module equipment. We cannot judge whether the entire tunnel washer system is efficient based on the efficiency of only one device. We cannot assume that if a laundry factory's tunnel washer system is equipped with 4 tumble dryers, all tunnel washer systems will be fine with 4 tumble dryers; nor can we assume that all factories must be equipped with 6 tumble dryers just because one factory is not equipped with 6 tumble dryers. Only by mastering the accurate data of each manufacturer's equipment can we determine how much equipment to configure more reasonably.
Post time: Sep-03-2024