OCR Text |
Show The chemical manufacturer is in an ozone non-attainment area and wants to expand production. To process a permit for this expansion, N O , offsets, in addition to lowering the levels of C O and H C N in the vent from the two-stage incinerator, are being sought. Quantitatively, the chemical manufacturer wants to achieve a 9 8 % reduction in H C N , a 9 5 % reduction in C O , and a 9 0 % reduction in NO,. PROBLEM SOLUTION In order to reduce the level of CO and HCN currently being emitted from the incinerator stack, it was recommended that the existing unit be modified to the Hybrid Low N Q , Process. This technology was developed to provide a more effective means of N O , reduction than is currently being achieved by staged combustion techniques or post-combustion selective reagent methods. The Hybrid Process combines thermal and catalytic treatment steps which results in higher destruction efficiencies than staged combustion and eliminates the need for potentially obnoxious reagents, such as ammonia or urea, which are required for selective post-combustion N O , reduction approaches. The technology can be applied to most processes which generate NO, and requires only auxiliary fuel and air to achieve N O , reductions in excess of 99 percent with C O emissions of less than 50 ppmv as shown in Figure 2. Patents have been issued for the application of the technology to internal combustion (IC) engines (3), boilers (4), and incinerators (5). Proof-of-concept testing has been completed for stationary IC engines, incinerators, and industrial boilers. Corrected NOx Corrected CO Figure 2. NOx and C O Emissions (corrected to 15% 02) from Hybrid Low N O x Process at USD Demonstration III |