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r _ �,;,::�_; - y, �;,.�€ ,.. � � ,F-;' E �rrot� '-� � -� '�r �%a .,_� £ =��=�-.� Ems_ -��} ..�:,�;. z�.� � :�%:: #. ,�. �•-:, � _ r; `�'r M - s _ r' x^" -r_ - :;. -fir-z r - r r 4.� �— a ..-- ---- ?', - •- = - moi-37-x- - - `r 5 the Catalytic reactor. ample a from theno ports ara on- aly2od to dotermine the hydrncabon destruction 4Lf f1CianC1or,. OPERATING PCnFe7 MAr3CF: vapor conconta'ations fron two progect sites are Shown in Figure 2, The data illustrates the broad range of vapor compositions under which the MMC is capable of operating. The top Curve shown data from an operation durin5l which the extracted vapor was in the f lamnables range. tl'ho lower flammability limit of gasoline vapors in air is ab,iut 15,000 ppm(v), or 1 .5t(v)). The. lower- curve sahous data obtained during operation of a CAR unit. At they beginning of thins project, she extracted air had a high combustible content and dilution .sir was required to prevent overheating of the catalyst. The admixture of dilution air resulted in a Mower drawdown of the hydrscarbon concentration for the first 20 days. Potential emissions to the atmosphere without control oL the vented ga. are shown in figure 3. At the 10,000 ppm(v) level and a flow rate of 100 Ctm, the emisassion% mould be almost 400 pounds per day. ' The VCP unit with supplemental l fuel would be the recommended operating node at this concen- tration of hydrocarbons. Cmissions from the VCP have been measured by numerous regulatory agencies stuch as the San Diego APCs, South Coast AQM€1, and the California Air Resources Board. In all instances the hydrocarbon do*- truCtion efficiencies have been above 99.01. Thus actual hydrocarbon emission, from the .tack are less than 1.0 lb/day. CO levels have been below 10 ppm, and NO, levels have been below 1 pprA. !.rad and sulfur have t: beton detected. At the 3,000 ppm(v) level and a flow rate of 90 Ctm, the uncontrolled emissions would be 100 lb/day. Operating a catalytic reactor at 90t destruction efficiency would redutn the emissions to 10 lb/day. It would be possible to operate the catalytic reactor at a higher destruction efficiency, thereby reducing emissions below 10 lb/day. This could be done by raising the: temperature: of the catalyst bed,. There Is a trade-off, however, between catalyst bed temperature —and-Catalyst---life.---Wo..__racam end that- be operated in a cost-effective gray to meet emission guide- lines while, at the same time, rainimixing catalyst detarl oration. At recommended operatinfj conditions the catalyst life has been found to exceed one year. 4 Emissions from operations In the CAR modes are shown in Table 1. The data are abstracted from a report subalttcd to