This article mainly introduces the relevant information of air electric heaters in meltblown fabric equipment (meltblown nonwoven machine, meltblown fabric machine). The meltblown process flow is: polymer preparation → melt extrusion → metering pump → meltblown die assembly → melt filament stretching → cooling → receiving device. Main equipment of meltblown equipment: feeding machine, screw extruder, metering pump, meltblown die assembly, air compressor, air electric heater, receiving device, winding device. For producing polyester and other raw materials, a chip drying device is also required. Auxiliary production equipment mainly includes die cleaning furnace, electrostatic application device and spray device.
The meltblown process requires a large amount of hot air. The compressed air output by the air compressor is dehumidified and filtered, then sent to the air heater for heating, and then sent to the meltblown die assembly. The air heater shell and heating elements must resist oxidation by high-temperature air, so the material must be stainless steel.
The following is the selection of air electric heaters for meltblown fabric equipment:
Name | Duct-type Air Electric Heater (Circulation Electric Heater) | Air-duct-type Air Electric Heater |
I. Overview: | ||
Medium | Air | Air |
Pressure | Heated gas pressure ≥0.3Kg/cm2. | Heated gas pressure ≤0.3Kg/cm2. |
Outlet Temperature | ≤850℃. | Low temperature type ≤230℃; Medium temperature type ≤450℃; High temperature type ≤650℃. |
Heating Method | Duct type (Circulation type). | Air-duct type. |
Power | Single unit ≤2500KW (multiple units can be combined). | Low temperature type ≤100kW; Medium temperature type ≤60kW; High temperature type ≤300kW. |
Image | ||
II. Control Options: | ||
SCR | SCR control panel adjusts the power of the electric heater, reducing the power density of the elements, causing the cooler to operate the electric heater. This reduction in power density will extend the life of the electric heater and prevent fluid degradation when flow is reduced. SCR control is recommended for gas applications requiring tight control and single-pass liquid flow. | |
SCR/Contactor Combination | For many large loads, full SCR control is impractical. For these applications, a combination of SCR and contactor control is a good choice for tight control with fluctuating demand. As demand increases, the SCR will "ramp up" the temperature until a full row of contactor circuits engages. The SCR will then "ramp up" and repeat the process until steady state is achieved. | |
Panel Material | Control panel available in carbon steel, 304SS and 316SS. | |
