Coke oven gas passes through processes to eliminate trace tar fog via_________________?
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Answer: C. Electrostatic precipitator
Explanation
Electrostatic precipitators apply high voltage electrical fields to ionize and capture sub-micron tar fog droplets. Charged tar particles migrate toward collecting electrodes, effectively scrubbing the flowing coke oven gas stream. This high efficiency separation prevents downstream pipeline fouling and protects sensitive chemical recovery units. Coke oven gas contains fine suspended tar fog droplets that must be removed prior to chemical processing. Electrostatic precipitation utilizes corona discharge to charge aerosol particles suspended in carrier gases. Tar removal is essential for maintaining the purity of recovered chemical by products like ammonia and benzene.
Steel mill byproduct recovery plants rely heavily on electrostatic precipitators for clean gas conditioning. Removing tar fog prevents fouling in downstream gas compressors, heat exchangers, and distribution mains. High collection efficiencies ensure environmental emission standards and product purity specifications are met. Option cyclone separator relies on centrifugal force, which is ineffective for capturing microscopic tar fogs. Option wet packed scrubber is used for bulk cooling and washing, but lacks the fine efficiency for sub-micron tar. Option washing with monoethanolamine removes acid gases like hydrogen sulfide rather than tar fog aerosols.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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