摘要:

We carried out tests on certain incinerator plant for two years from 1993 through 1994, to assure the effect of pulsed corona discharge for removal of NOxand dioxin in flue gas in the small-scale experimental apparatus. The gas volume of the test plant is 50NM3/H.

ISSN:0010-2202    

DOI:10.1080/00102209808952023

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

In order to establish a design rule of the plasma reactors, a fundamental investigation was carried out. The results show that important points of the design criteria were flow speed of gas and power input to the discharge tubes. An engineering model of plasma reactor for 100 kVA diesel engine generating system was designed, constructed and tested. The reactor is composed of 3 blocks, 30 discharge tubes with 1 m long and they are driven by a high voltage inverter power source. The test results show that the fundamental data were applicable to the engineering model reactor and the required energy yield of NO oxidation process was almost attained. A scale up rule has also been confirmed

ISSN:0010-2202    

DOI:10.1080/00102209808952024

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

An experimental investigation has been conducted to reduce NOxfrom combustion flue gases by means of corona discharge activated methane radical injection methods. Two types of corona radical injectors, the hollow needle type and the multihole type, are used in the present investigations. Experiments are conducted for the simulated flue gas (Nx:Ox:COxNO = 83.996:8:8:0.004) flow rate from I to 20L/min., the activation voltage from 0 to 40 KV and the Ar-methane mixture gas (95:5) flow rate from 0 to 200 mL/min. The results show that the NOxreduction increases with increasing activation voltage and nonmonotonically depends on methane stoichiometry. Trace amounts of N2O and NH3were observed as a by product

ISSN:0010-2202    

DOI:10.1080/00102209808952025

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Application of non-thermal plasma for gas cleaning is gaining prominence in the recent years. Normally, the gas treatment was carried out at or above room temperature, by the dry type plasma reactor. However, this treatment is still inadequate in the removal of certain stable gases present in the flue gas mixture. We propose the non-thermal plasma process at very low temperature, and report here some interesting results of treatment of NO or N2O with pulsed plasma below — 100°C ambient temperature. Direct methanol synthesis from CH4and CO2at very low temperature is also reported. A comparative analysis of the various tests are presented together with a note on the energy consideration

ISSN:0010-2202    

DOI:10.1080/00102209808952026

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

The effect of magnetic field on NOxremoval characteristics from a model combustion gas has been experimentally investigated using a DC corona discharge reactor with a multipoint-plate geometry. The experiment was conducted for a simulated flue gas (NO:O.17%, N2:99.83%) and the NO concentration and gas flow rate were varied during the experiment.

ISSN:0010-2202    

DOI:10.1080/00102209808952027

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

The reduction of NOxfrom diesel engine exhaust gas by superimposing barrier discharge plasma reactors is experimentally investigated. The experiments are conducted for the applied voltages from 0 to 24 kV, electrode gap distance from l.5 to 5.0 mm, and the flow rates from 0.2 to 2 L/min at initial NOxconcentration 1,700 ppm. The results show that NOxreduction increases with increasing discharge power and electrode gap distance. The superimposing barrier discharges under out-of-phase operation mode shows best result, where maximum NOxreduction rate is approximately 60% at operating electric power 10 W.

ISSN:0010-2202    

DOI:10.1080/00102209808952028

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

An experimental investigation has been conducted to reduce NOxfrom combustion flue gases by means of corona discharge activated ammonia radical shower methods. Experiments were conducted for pure nitrogen-NO, wet air-NO, and simulated combustion gases at a flue gas flow rate 3 l/min. The results showed that the NOxreduction increased with increasing activation voltage. In case of wet air-NO mixture gases, a NOxreduction efficiency of 100% was achieved. The deposited NH4NO3aerosol particles have a significant effect on the stability of intense streamer coronas. Trace amounts of N2O in an exhaust gas and NH4NO3aerosol particles deposited on the electrodes were observed as by-products

ISSN:0010-2202    

DOI:10.1080/00102209808952029

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Gaseous TCE (Trichloroethylene) was decomposed by 185 nm wavelength UV (ultraviolet) lamps and studies were made on the correlation between the residence time and the decomposition percentage, among others. A single UV lamp test reactor was used for the first series of tests. Gaseous TCE was able to be decomposed 100% within a very short residence time. However, the gas following the TCE decomposition contained, besides theoretical final products (hydrogen chloride and carbon dioxide), numerous by-products. Many of these by-products were able to be detoxicated by a sodium hydroxide solution. Increasing of the residence time yielded almost 100% CO2(carbon dioxide) in terms of carbon balance. Identical tests were also done using a multi-UV lamp test reactor, but as there were differences between it and a single UV lamp version (e.g., reactor volume, number of lamps, and lamp wattage) the decomposition performance (CO2generation percentage) was evaluated using the electric energy per TCE unit [J/g-TCE] as the parameter. The decomposition performance by both apparatus was almost identical

ISSN:0010-2202    

DOI:10.1080/00102209808952030

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Power consumption and byproducts analysis are two key issues that users must address in determining which nonthermal plasma technology is the most appropriate for certain applications. We compared the operating characteristics and power consumption for scaled-up nonthermal plasma devices: pulsed-corona, packed-bed, silent corona, and surface discharge plasma technologies. Advantages and disadvantages of each nonthermal plasma technology are discussed. Understanding of plasma chemistry or byproducts is also essential for the development of nonthermal plasma technologies. Plasma chemical reactions of trichloroethy-lene (TCE) and alkyl acetates were investigated using pulsed-corona and packed-bed reactors. The effects of excited electrons, background gas, moisture, and reactor-dependent phenomena on product distribution and chemical interaction were studied. The initial step of plasma chemical decomposition of TCE can be ascribed to the electron attachment (not to active oxygen species or OH radicals), followed by homolysis and/or heterolysis reactions. Extremely high decomposition of TCE was obtained in nitrogen. Byproduct formation was significantly suppressed under aerated conditions. Alkyl acetate decomposition was affected by reactor type and alkyl chain length

ISSN:0010-2202    

DOI:10.1080/00102209808952031

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

This paper presents the results of plasma chemistry calculations to study the effect of dose rate, pulse length and pulse repetition rate on pulsed electron beam processing of NOxand SO2in combustion flue gases. The main objective is to determine if the proposed combinations of dose rate, pulse length and pulse repetition rate would have any deleterious effect on the utilization of radicals for pollutant removal. For a dose rate of 2 × 106kGy per second and a pulse length of 30 nanoseconds, the average dose per pulse is sufficiently low to prevent any deleterious effect on process efficiency because of radical-radical recombination reactions. During each post-pulse period, the radicals are utilized in the oxidation of NOxand SO2in a timescale of around 200 microseconds; thus, with pulse frequencies of around 5 kilohertz or less, the radical concentrations remain sufficiently low to prevent any significant competition between radical -pollutant and radical - radical reactions. The main conclusion is that a pulsed electron beam reactor, operating with a dose rate of 2 × 106kGy per second, pulse length of 30 ns and pulse repetition rate of up to around 5 kHz, will have the same plasma chemistry efficiency as an electron beam reactor operating with a very low dose rate in continuous mode

ISSN:0010-2202    

DOI:10.1080/00102209808952032

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor