Air purification technology: Currently in Japan's Kan-Etsu Tunnel has been successfully used for electricity in the longitudinal ventilation system in the longitudinal section of the tunnel to remove dust in the polluted air. But > electrostatic can not purify the road tunnel in another major pollutant - carbon monoxide (CO). After exploring and researching, the tunnel developed using high-voltage pulse corona technology, simulated in the laboratory to purify the polluted air in the road tunnel, and achieved the following results: the tunnel in the wind speed of 7.5m/s conditions, the dust removal rate of 93%, the CO purification rate of 72%.
I. Principle of high-voltage pulse corona technology
The high voltage pulse generated by the pulse power supply is added to the reactor electrodes, which generates a strong electric field between the reactor electrodes. Under the action of the strong electric field, some of the molecules are ionized, and the ionized electrons are accelerated by the strong electric field to gain energy and become high-energy electrons (5-20eV), and the high-energy electrons can activate, cleave, and ionize other molecules, to produce OH, O, HO2 and other kinds of active particles and free radicals. In the reactor, the SO2 and NO in the reactor are oxidized by the active particles and free radicals to the higher-order oxides SO3 and NO2, which meet with the H2O in the flue gas to form H2SO4 and HNO3, and in the case of injection of NH3 or other neutralizers to generate (NH4)2SO4/NH4NO3 aerosol, which is then collected by the dust collector. The electric field of the pulsed corona discharge flue gas denitrification reactor itself has a dust removal function at the same time.
Two, high-pressure pulse corona technology treatment process
High-pressure pulse corona technology is mainly composed of flue gas conditioning system, pulse high-voltage power supply system, reactor system, by-product collection system, control system, ammonia station and auxiliary devices. After dedusting the boiler flue gas, the flue gas conditioning tower regulates the temperature and humidity of the flue gas, and then flows through the reactor, in the pulsed corona discharge plasma field in the reactor, the sulfur dioxide and nitrogen oxides in the flue gas interact with the ammonia provided by the ammonia station to form ammonium sulfate and ammonium nitrate, respectively. The by-products are collected through a by-product collection system and used as fertilizers, and the clean flue gas is discharged from the chimney.
Three, high-pressure pulsed corona technology development background
Pulsed corona plasma (Pulse-induced Plasma Chemical Process, i.e., PPCP) (SO2) denitrification (NOx) is a technology developed in the 80s.
In 1984, Mizuno first pulsed corona discharge on the simulation of flue gas to remove SO2 test, the experiment shows: pulsed corona on the removal of SO2 is very effective, in terms of energy utilization, it is at least twice as much as the electron beam.
In 1986, Masuda conducted a study of NO removal using positive and negative pulsed corona discharges, and the results showed that NO could be removed with both positive and negative pulsed discharges.In 1986, Clements conducted a study of simultaneous removal of SO2, NOx, and fly ash using pulsed corona. The presence of fly ash was found to improve NO removal. The results of this experiment were very attractive for the modification of dust collectors. Thereafter, Dinelli's industrial test of simultaneous removal of NOx and SO2 from flue gas by pulsed corona resulted in a denitrification efficiency of 50% to 60% and an efficiency of about 80%. 1992, WangRonyi investigated the removal of SO2 and NO by positive pulsed corona using a simulated flue gas that was very close to the real flue gas, with a desulfurization rate of more than 95% and a denitrification rate of 30% to 57%. ~57%.In the late 1980s, China also began to study the pulsed corona discharge desulfurization and denitrification technology. Wu Yan and Masuda studied the oxidation of NO in the corona field. Experimental results show that: NO oxidation, positive polarity pulse voltage effect is good, and the shorter the rise time of the pulse voltage front, the better. Chongqing University recently used nanosecond (ns) level pulsed corona discharge technology to oxidize CO removal experimental research, and achieved satisfactory results. The study shows that the technology has a broad application prospect.
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