Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
CHEE 450 Design Project: Air Filtration Kelsea Fitzpatrick | Kristen DeJong | Kelsey Barton Presentation Outline Introduction and Design Considerations Aerosols HEPA Filters Filtration Mechanisms Proposed Design Alternatives Introduction and Design Considerations Air filter is initial step in insulin process, sterilizing fermentor feed SuperPRO output: Fermentation as batch process Feed composition of ammonia, nitrogen, and oxygen Unspecified particulate matter 1166 m3/hr average flowrate Sterilized air required for fermentor to ensure no batch contamination Aerosols Solid and liquid contaminants suspended in gas streams Typical size: 0.001 µm to 100 µm Particulates follow lognormal distribution Examples: Soil, bacteria, pollen… Soil Particles (magnified) E. coli bacteria Pollen Particles (magnified) Vacuum cleaner HEPA filter HEPA Filters High Efficiency Particulate Filter Removes at least 99.97% of air borne particles > 0.3 µm Requires prefilter system to capture larger particles Initially developed in 1940’s for a top-secret method of eliminating radioactive particulate Currently used in: electronic, medical, pharmaceutical, and nuclear fields Filtration Mechanisms Proposed Design Recommended filters from Cambridge Filter Corp Prefilter Aero-Answer Mate - $75.00 60-65% efficiency 1580 m3/h HEPA Filter Absolute Filter - $160.00 99.97% efficiency 1680 m3/h Considerations Moisture susceptibility Replacement cost and frequency Ozone molecule Alternatives Air filtration alternatives Ozone (O3) injection UV Radiation Gas Scrubbing Heat Serves to kill biological particles but not necessarily remove all physical or chemical particles Less economical