Application of Pulsed Corona Induced Plasma Chemical Process to an Industrial Incinerator

Abstract

Pulsed corona induced plasma chemical process (PPCP) has been investigated for the simultaneous removal of NO(x) (nitrogen oxides) and SO2 (sulfur dioxide) from the flue gas emission. It is one of the world's largest scales of PPCP for treating NO(x) and SO2 simultaneously. A PPCP unit equipped with an average 120 kW modulator has been installed and tested at an industrial incinerator with the gas flow rate of 42 000 m3/h. To improve the removal efficiency of SO2 and NO(x), ammonia (NH3) and propylene (C3H6) were used as chemical additives. It was observed that the pulsed corona induced plasma chemical process made significant NO(x) and SO2 conversion with reasonable electric power consumption. The ammonia injection was very effective in the enhancement of SO2 removal. NO removal efficiency was significantly improved by injecting a C3H6 additive. In the experiments, the removal efficiencies of SO2 and NO(x) were approximately 99 and 70%, respectively. The specific energy consumption during the normal operation was approximately 1.4 Wh/m3, and the nanopulse conversion efficiency of 64.3% was achieved with the pulsed corona induced plasma chemical process.

An Industrial Streamer Corona Plasma System for Gas Cleaning

“…Considering a 95% of the efficiency from the mains to the C h , we can conclude that the total energy conversion efficiency is about 90%. For the 120 kW average power modulator described in [14], the efficiency is about 50%. The 40-kW average power modulator described in [13] has a efficiency of less then 76%; and for the system described in [22], it is less then 50% for 1-2 kW average power.…”

“…Nevertheless, three industrial corona plasma demonstration systems with up to 40-120 kW in average power were recently reported in Japan, Korea, and China. For example the system described by Mok et al [13], with an average output power of 40 kW, or the system described by Lee et al [14], with an average output power of 120 kW. All of them are based on magnetic compression techniques with pulse duration of 200-500 ns.…”

An Efficient, Repetitive Nanosecond Pulsed Power Generator with Ten Synchronized Spark Gap Switches

“…Semiconductor switches have a long lifetime and a high repetition rate (hundreds of kHz or even MHz) [9][10][11]; the main problems are their limited capacity and high cost for large-scale applications. Magnetic switches are robust and can be also used for high repetition rates (several kHz), however, their energy conversion efficiency for short pulse generation is relatively low (typically 60-80%) [12][13][14][15][16], and there is always a primary switch needed. The spark gap switch can hold a high voltage and carry a large current, and has a low conductive impedance and is easy to construct as well.…”

“…A system described by Mok et al [14], can deliver a ~500 ns (FWHM-full wave at half maximum) pulse with a peak power of ~500 MW, a peak current of 3.3 kA, a rise time of about 200 ns, and a maximal efficiency of 76%. A system described by Lee et al [16], can generate 700 ns pulse with a peak power of ~600 MW, a peak current of ~5 kA, a rise-time of about 70 ns, and a typical energy efficiency of 64.3%. Our previously developed single spark-gap switch based pulse generators are able to produce short pulses (50-100 ns) with a maximal efficiency of 95%, but at a low peak power [17,18].…”

Reduction of NO x /SO2 by Wire-plate Type Pulsed Discharge Reactor with Pulsed Corona Radical Shower

“…Especially the pulsed corona discharge process, owing to its advantages such as simultaneous removal of SO 2 , NO x and VOCs, simple operation process, small installation area, etc, represents a very attractive alternative to the conventional treatment methods of flue gas like flue gas desulphurization (FGD) and selective catalytic reduction (SCR). Furthermore, this process has already been demonstrated by several large-scale industrial experiments [7][8][9].…”