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Since EPA MACT regulations are based on mass emissions, most research done on Hazardous Air Pollution (HAP) emissions focused on the biggest mass contributor, formaldehyde. However, experience with California Toxic Hot Spot regulations show that other constituents must be considered with risk-based rules are applied. In Particular, polynuclear aromatic hydrocarbons (PAH), benzene, and acrolein play a role in addition to formaldehyde. The destruction efficiency of these HAPS across a Non-Selective Catalytic Reduction (NSCR) catalyst is not well documented, so tests were conducted on a Superior 6G825 reciprocating IC engine with a MORATECH Corporation NSCR catalyst at Colorado State University. Formaldehyde, acrolein, and acetaldehyde were measured with a Nicolet Magna FTIR. Benzene, toluene, ethyl benzene and xylenes (BTEX) and PAH compounds are measured by Emissions Monitoring, Inc. using EPA Method 18 and California Air Review Board (CARB) method 429. An equivalence ratio of approximately 1.005 – 1.010 is maintained for four sample runs. Data are presented for 100% (900 rpm, 500 bhp) and 70% load. Pre-catalyst formaldehyde concentration levels were about 5 ppm. Formaldehyde was reduced by an average of 95% across the catalyst. Acrolein concentration levels were below the minimum detectable concentration levels both pre and post catalyst. Post catalyst acrolein concentration levels were below 130 ppb. Benzene and toluene were the most significant PAH compounds measured with pre-catalyst concentrations of 5.6 ppb and 2.5 ppb, respectively. Removal efficiencies for the naphthalene and acenaphthalene were 88% and 97% respectively. These destruction efficiencies are much higher than typically assumed by California air districts during the permitting process.
Your Price $195.00
List Price $195.00