(4) Evaluation of the performance of the cotton dryer
The evaluation of the performance of the cotton dryer should be based on the “National Industry Standard for Dryers” and considered from a practical perspective. That is, the main indicators to evaluate the performance of the dryer are energy consumption, water removal rate after one drying, drying unevenness and safe operation rate.
1. Energy consumption
Energy consumption includes thermal energy consumption and electrical energy consumption. Thermal energy consumption is calculated by the following formula:
So far, the drying of cotton depends on the increase in the temperature of the conveyed air. Therefore, the power consumption mentioned here refers to the operation of the cotton dryer itself and the process required. The electric power consumption of the fan is the electric power consumption of the hair dryer and suction fan.
2. Water removal rate after primary drying
The water removal rate after primary drying is not as high as possible, because the moisture content of cotton entering the sawtooth gin is 7% to 9%, which is the optimal work of the ginning system. Conditions, at this time, the cotton fiber has the highest output, the best quality, the most stable machine operation, and the lowest failure rate of equipment and processes. Therefore, for super-water molecular cotton, the optimal moisture content is 7% to 9% after one drying.
3. Drying unevenness
Drying unevenness refers to the difference between the highest moisture content and the lowest moisture content of cotton after drying. The standard stipulates that drying unevenness cannot exceed 1%, which means that drying is required The moisture content of the cotton after drying in the dryer should be as consistent as possible. Some of the cotton should not be dry and some should be wet. Otherwise, it will affect the subsequent processing of cotton.
4. Safe operation rate
The dryer should not be blocked and can work continuously for a long time. The use of the dryer should not affect the normal production of the ginnery.
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