One of the key differences between halogen bulbs and traditional incandescent lamps lies in the gas inside the glass envelope. Instead of just a vacuum or inert gas, halogen bulbs are filled with a small amount of halogen gas, typically iodine or bromine. This unique composition allows for a special chemical process that significantly improves the bulb's performance and lifespan.
When the filament is heated, it emits tungsten atoms that travel toward the glass surface. Upon reaching the cooler parts of the bulb, these tungsten atoms combine with the halogen gas to form a compound called a tungsten halide (such as tungsten iodide or bromide). This compound then moves back toward the hotter center of the bulb, where it breaks down again into pure tungsten and halogen gas. The tungsten returns to the filament, while the halogen re-enters the gas mixture, creating a continuous cycle.
This self-repairing mechanism prevents the filament from degrading over time. As a result, halogen bulbs last much longer—up to four times longer than standard incandescent bulbs. Additionally, because the filament can operate at higher temperatures without melting, halogen lamps produce brighter light, have a higher color temperature, and are more energy-efficient.
Although halogen lamps still work by heating a tungsten filament to emit light, they differ from regular incandescent bulbs due to the presence of the halogen gas. The gas mixture usually contains 95% dibromomethane and helium, along with 5% high-purity nitrogen. This combination creates the so-called "halogen cycle," which helps maintain the integrity of the filament and the clarity of the bulb’s glass.
In this cycle, tungsten evaporates from the hot filament and travels to the cooler areas of the bulb. There, it reacts with bromine to form WBr₂, which then moves back to the hotter region of the filament. Once there, it decomposes, depositing tungsten back onto the filament and releasing bromine back into the gas. This process prevents the filament from thinning and breaking, and also stops darkening on the bulb’s walls, leading to a much longer life and better performance.
Lobe Pumps For Chemicals In Paper Making
Lobe pumps mainly be used following positions in the paper making industry:
Preparation of starch glue and feeding and conveying of starch.----S.S. lobe pump
Coating preparation and coating feeding and transportation.----S.S. lobe pump
Chemical unloading and chemical addition.----S.S. lobe pump
Rotor pumps for paper making, Rotary lobe pumps for paper-making,Rotor pump in paper making
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