Towards ideal NO/sub x/ control technology using plasma-chemical hybrid process

Yamamoto, Toshiaki; Okubo, Masaaki; Hayakawa, K.; Kitaura, Koichi

doi:10.1109/ias.1999.805940

Cited by 16 publications

(8 citation statements)

References 11 publications

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“…The CO concentrations are 14-24 ppm in all conditions and do not increase when propane is added. The removal efficiencies in Table 3 are higher than those reported in [20][21][22] because high-performance nanosecond-pulse high voltage power supply may be used to energize the NTP reactor. Figure 12 shows time-dependent NO x reduction characteristics after the gas passes through the Na 2 SO 3 chemical reactor.…”

Section: Pilot-scale Experiments For Simultaneous Removal Of No X and contrasting

confidence: 67%

“…Although this satisfies the environmental regulations of the Japanese Ministry of the Environment [27], it should be removed by oxidation catalysts or other suitable methods. It is known from previous experiments [20][21][22], that N 2 O is produced in negligible amounts by the present method. The SO 2 in the flue gas is completely removed.…”

Section: Small-scale Experiments For Plasma-chemical Hybrid Treatment mentioning

confidence: 88%

“…In this method, plasma-induced NO 2 is reduced to N 2 using a wet-type chemical scrubber with a sodium sulfite (Na 2 SO 3 ) or sodium sulfide (Na 2 S) aqueous solution. These have been studied at a laboratory scale in experiments for simulated exhaust gas [16][17][18][19][20][21][22] and boiler emission [23]. However, this technology needs further analysis on reaction byproducts (especially they are harmful or not) when it is applied to a real exhaust gas including many components.…”

mentioning

confidence: 98%

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Pilot-Scale Experiment for Simultaneous Dioxin and NO x Removal from Garbage Incinerator Emissions Using the Pulse Corona Induced Plasma Chemical Process

Yoshida

Yamamoto

Kuroki

et al. 2009

Plasma Chem Plasma Process

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A pilot-scale pulse corona induced plasma chemical process (PPCP) reactor for controlling gas-phase dioxins and NO x simultaneously is installed in a garbage incineration plant. The flow rate of the sampled flue gas is 5,000 Nm 3 /h (N: standard state) in maximum at the PPCP reactor, which consists of 22 wire-cylinder electrodes and is energized by a 50 kW nanosecond pulse high voltage generator. With an applied plasma energy density of 2.9-6.1 Wh/Nm 3 , the decomposition efficiency for dioxins is 75-84% based on TEQ (toxic equivalents); the conversion efficiency of NO to NO 2 is *93% at maximum. The flue gas treated by the PPCP reactor is introduced at a rate of 50 Nm 3 /h to a wet-type chemical reactor, which uses an aqueous solution of sodium sulfite (Na 2 SO 3 ). More than 90% of NO x is reduced to nitrogen, with negligible byproducts such as NO 2 -or NO 3 -ions left in the solution.

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Section: Pilot-scale Experiments For Simultaneous Removal Of No X and contrasting

confidence: 67%

Section: Small-scale Experiments For Plasma-chemical Hybrid Treatment mentioning

confidence: 88%

mentioning

confidence: 98%

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Pilot-Scale Experiment for Simultaneous Dioxin and NO x Removal from Garbage Incinerator Emissions Using the Pulse Corona Induced Plasma Chemical Process

Yoshida

Yamamoto

Kuroki

et al. 2009

Plasma Chem Plasma Process

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“…7 that the NO removal efficiency may decrease as the pH of the solution increases further above 12.86. After 120 min operation, the NO However, on the other hand, the Co(en) 3 3+ concentration decreases because the formation of Co(en) 2 (OH) 2 + , Co(en)(OH) 4 − and even Co(OH) 3 deposit increases with the pH value in the aqueous solution, which gives rise to the decrease of NO removal efficiency.…”

Section: Effect Of Ph On No Removalmentioning

confidence: 94%

“…The NO X treatment techniques are broadly classified as dry and wet processes. The dry processes are further classified as selective catalytic reduction (SCR) [1,2], selective non-catalytic reduction (SNCR), adsorption and nonthermal plasmas [3,4]. SCR of NO by NH 3 at 300-400 • C to form water and nitrogen is the best developed and worldwide used technology for the control of NO X emissions in fuel combustion from stationary sources [5].…”

Section: Introductionmentioning

confidence: 99%