CHEN 4501W Lecture Notes - Lecture 38: Grain Elevator, Boiling Liquid Expanding Vapor Explosion, Deflagration

• School: UMN
• Department: Chemical Engineering
• Course: CHEN 4501W
• Professor: Derby Jefferey

Document Summary

Mixtures: fuel + o2 --> co2 + h2o grain dust + o2 --> co2 + h2o. Fire diffusion limited rxn btwn fuel and oxidant. Liquids never burnthey vaporize and mix with oxygen in air. Explosions rapid, transient combustion (decomposition or oxidation) deflagration: v < vsound detonation: v > vsound pressure wave causes damage blast focussing important depends strongly on presure and confinement. Inhaled: suffocation, very high hazard: n2 co2 hemoglobin binding: smoking, co, h2s (rotton eggs), hcn. Chen4501w_design1 page 1 hemoglobin binding: smoking, co, h2s (rotton eggs), hcn neurological pistons: ash3, hg(ch3)3 cancer: smoking, asbestos, silica, pcbs, dioxin: Ingested: long term effects, love canal no backup pressure relief valve no alternative cooling system scaled up reactor (heat generation goes up proportional to volume, but cooling goes up with surface area) Theory of safety probability of failure, time to failure coupling of probabilities. N events in series (n things all have to work) p = pn.