This article mainly introduces relevant information about 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 for meltblown: 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 slice drying device is also required. Auxiliary production equipment mainly includes die cleaning furnace, electrostatic application device, and spray device.
The meltblown process of air electric heater requires a large amount of hot air. The compressed air output from the air compressor is dehumidified and filtered, then sent to the air heater for heating, and then to the meltblown die assembly. The shell and heating elements of the air heater 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 | Pipeline Air Electric Heater (Circulation Electric Heater) | Duct 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 | Pipeline (Circulation). | Duct. |
Power | Single unit ≤2500KW (multiple units can be combined). | Low temperature type ≤100kW; Medium temperature type ≤60kW; High temperature type ≤300kW. |
II. Control Selection: | ||
SCR | SCR control panel adjusts the power of the electric heater, reducing the power density of the elements, causing the cooler to run the electric heater. This reduction in power density will extend the life of the electric heater and prevent fluid degradation when flow is reduced. For gas applications requiring tight control and single-pass liquid flow, SCR control is recommended. | |
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 panels are available in carbon steel, 304SS, and 316SS. | |
