Pulsed coronal discharge for combined removal of SO(sub 2), NO(sub x) and fly ash from flue gas

摘要

The processing chamber has been designed with an outer pipe of two inches in diameter. This tube can be used as an electrode, other geometries of smaller dimensions can be placed inside. A cross section is shown in Figure 1. The current reaction chamber is 15.24 cm in length, but can be increased as needed to match the impedance of the cable to that of the processor for maximum energy transfer. Configurations tested for NO removal are a 0.157 cm stainless wire in a 4.06 cm stainless tube, a 0.102 cm platinum wire in 2.54 cm tube lined with 0.0025 cm platinum foil, and a center conductor of 1.27 cm diameter thin brass discs spaced at 0.635 com in a 5.08 cm stainless tube. We have changed the charging circuit to allow high pulse rates. The present system performs well up to twenty pulses per second. Most of the data taken has been at a pulse rate of five pps. Part of the reason for this rate is that we want mixing to take place between pulses. The volume of the reaction chamber is approximately 0.3 lifers and the flow rate is from three to five liters/second. Once an optimum geometry is found we will determine the efficiency of single pass processing. This will include reducing the flow to be just in turbulent flow and then increasing the pulse rate. Since the system is eight liters and in turbulent flow then with a one liter/second flow we would pulse the system for eight seconds. This may cause a significant improvement at lower NO concentrations.