Английская Википедия:Fluidized bed concentrator
A fluidized bed concentrator (FBC) is an industrial process for the treatment of exhaust air. The system uses a bed of activated carbon beads to adsorb volatile organic compounds (VOCs) from the exhaust gas. Differently from the fixed-bed or carbon rotor concentrators, the FBC system forces the VOC-laden air through several perforated steel trays, increasing the velocity of the air and allowing the sub-millimeter carbon beads to fluidize, or behave as if suspended in a liquid. This increases the surface area of the carbon-gas interaction, making it more effective at capturing VOCs.
Components
The fluidized bed concentrator consists of five primary components:
- Adsorption tower
- Desorption tower
- Thermal oxidizer
- Carbon transport system
- Process fans: inlet adsorber, inlet desorber, outlet oxidizer to stack
How it works
Industrial processes requiring ventilation, including paint booths,[2] printing, and chemical production, exhaust the ventilated air to the fluidized bed concentrator at room temperature.[3] The air first passes into the adsorption tower, where it moves through six perforated trays of clean carbon beads. The 0.7 mm bead activated carbon (BAC) fluidizes in the trays and captures the VOCs as they intermix.
The saturated carbon beads are passed from the adsorber tower to the desorber tower, where the beads are heated to 350 °F and the VOCs are released. Typically the adsorber tower is many times larger than the desorber tower, leading to an air volume reduction and an increase in VOC concentration. The ratio of adsorber size to desorber size is called the concentration ratio, and ranges from 10:1 to 100:1.[4]
The concentrated VOC gas stream is sent from the desorb tower to a thermal oxidizer, where the organic compounds are heated to 1400 °F and oxidized, or broken down into carbon dioxide (CO2), water (H2O), and by-products. In some cases, small amounts of carbon monoxide (CO), nitrogen oxide (NOX), and other gases are produced.
Emissions and energy usage
The primary advantage of the FBC over traditional rotor concentrators lies in its ability to achieve any concentration ratio up to the lower explosive limit (LEL). This allows Honda Alabama's paint shop to switch from oxidizing 100,000 CFM of VOCs in a regenerative thermal oxidizer (RTO), to oxidizing only 1,500 CFM of VOCs in a small thermal oxidizer, at a much higher concentration. Reducing the volume of air to be oxidized from 100,000 CFM to 1,500 CFM (66:1 concentration ratio), allows for a much lower energy usage and consequently, fewer CO2 and NOX emissions.
Industries served
See also
- Volatile organic compound
- National Emissions Standards for Hazardous Air Pollutants
- Air pollution in the United States
- Activated carbon
- Air pollution
References
External links
- Clean Air Act plus further links to relevant rules, reports, and programs.
- Organic NESHAP
- Английская Википедия
- Страницы с неработающими файловыми ссылками
- Air pollution control systems
- Pollution control technologies
- Air pollution in the United States
- Hazardous air pollutants
- United States Environmental Protection Agency
- Chemical safety
- Volatile organic compound abatement
- Industrial processes
- Fluidization
- Страницы, где используется шаблон "Навигационная таблица/Телепорт"
- Страницы с телепортом
- Википедия
- Статья из Википедии
- Статья из Английской Википедии
_at_Honda_Alabama.png){kind=link}
