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How organic heat carrier is used in spunbond nonwoven equipment
Organic heat carrier is a general term for organic substances used as heat transfer medium, including heat transfer fluid, heat transfer oil, heat medium, etc. It is an organic medium used for indirect heat transfer. It is widely used in various industrial fields because of its ability to generate high temperature under low vapor pressure, high heat transfer efficiency, and convenient transportation.
The spunbond non-woven fabric technology mainly uses polyester and polypropylene as raw materials, extrudes and stretches the polymer to form continuous filaments, and then lays the filaments into a net, and the fiber net is self-bonded and stretched. Thermal bonding, chemical bonding or mechanical reinforcement methods to turn the web into a non-woven fabric.
1. Heat characteristics of equipment used in spunbond non-woven fabrics industry
Taking the process flow of PP as the main raw material as an example, the equipment heat consumption of spunbond non-woven fabrics is mainly concentrated in Main screw, filter, meter, spinning box and 5 parts of hot rolling mill. Due to differences in equipment structure, all or part of the above 5 parts use organic heat carrier for heat exchange to heat or keep warm products and equipment. We divide it into three major parts, and the heating temperature varies depending on the raw material.
2. The organic heat carrier used in the spunbond non-woven fabric industry equipment is prohibited from overheating
Under the operating conditions of the heat transfer system, the system heating The average main fluid temperature of the heat transfer oil measured at the outlet of the element is the working temperature; the maximum main fluid temperature of the heat transfer oil allowed at the outlet of the system heating element is the maximum working temperature. The temperature of the organic heat carrier exceeds its maximum allowable use temperature, that is, overheating. 'Boiler Safety Technology Supervision Regulations' stipulates that the maximum working temperature of organic heat carrier should not be higher than its natural point. When the average mainstream density of the radiant heating surface of the heating element is greater than 50kw/m, the maximum working temperature of the organic heat carrier should be 20°C lower than the maximum allowable use temperature.
There is a difference between the maximum allowable operating temperature of the oil and the maximum operating temperature of the system, because the highest point of the system medium temperature appears in the boundary layer in direct contact with the heating element, and the temperature on the instrument side is the average mainstream of the medium body temperature.
(2) Reasons for overheating
①The maximum allowable working temperature of the selected oil is lower than the working temperature of the system;
②The oil heats up too fast when the system starts;
③The maximum heat flux density on the surface of the metal sheath of the electric heating element is greater than 20kw/m;
④The flow velocity of the medium around the heating element is less than 2m/s.
(3) Overheating hazard
The thermal cracking phenomenon will occur when the oil temperature exceeds the maximum temperature it can withstand, and the cracking and metamorphism rate increases exponentially with the continuous increase of temperature , The metamorphic rate of the organic heat carrier increases, and the sludge and coking are gradually formed in the system, which reduces the heat exchange efficiency, increases the load of the circulating pump, and increases the energy consumption.
Spunbond non-woven fabrics use heat mostly in the form of electric heating. In the process of using organic heat carrier for heat transfer, the occurrence of medium over-temperature and heat should be prevented. Oxidation and leakage to ensure the safety of operators and the normal operation of equipment.
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