Experimental and modeling study of the effect of CH4 and pulverized coal on selective non-catalytic reduction process

Zhang, Yanwen; Cai, Ningsheng; Yang, Jing-biao; Xu, Bo

doi:10.1016/j.chemosphere.2008.07.032

Cited by 27 publications

(30 citation statements)

References 20 publications

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“…The mechanism and effect of hydrocarbons as additive to the process has a generally accepted conclusion: it extends the temperature window and shifts it towards lower temperature through promoting the production rate of active radicals, but decreases the maximum NO x removal efficiency [15].…”

Section: Technological Principles Of Reactionsmentioning

confidence: 99%

“…So far, many researches have been done on urea as reduction agent [11][12][13], but N 2 O has not been taken into consideration or given enough attention. Using additives to improve reaction characteristics of SCNR process has been studied by many scholars; the additives are usually hydrocarbons to De NO x process [14,15] and sodium salts to NO x OUT process [16][17][18][19]. Most studies on the NO x OUT process with additives did not consider the detailed effects on N 2 O for its low concentration or explained the effect just from the aspect of active radicals' effect.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study of the influence of sodium salts as additive to NO x OUT process

Liang

Zhong

Jin

et al. 2010

Korean J. Chem. Eng.

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An experimental study of the SNCR process with urea as reducing agent and sodium salts as additive has been carried out, and detailed analysis of the reaction mechanism has been given here. In the temperature range of 800-975 o C, NO concentration decreases at first and then increases while the concentration of N 2 O increases at first and then decreases with the increasing of temperature, and the turning point is 900 o C. With increasing of normalized stoichiometric ratio of reduction nitrogen to NO x (NSR), NO removal efficiency increases, while the concentration of N 2 O also increases, which decreases overall NO x removal efficiency. With sodium salts as additive, the concentration of N 2 O decreases with increasing of sodium salts addition at all temperatures, while the concentration of NO decreases at first and then increases at low-temperature side of the temperature window and increases at high-temperature side with additional increasing, whose changing extent is smaller than N 2 O. Since sodium salts as additive can remove N 2 O effectively and have no large influence on the removal of NO, the effect of sodium salts as additive is the combined effect of the production of active radicals and the removal of HNCO produced by the decomposition of urea through neutralization reactions, which is more important. To achieve the same effect under each condition, the needed addition of NaOH and CH 3 COONa is less than that of Na 2 CO 3 counting as Na atom. For the decomposition of CH 3 COONa can produce CH 3 COO, its addition can promote the reduction of NO more obviously at the lower temperature than Na 2 CO 3 or NaOH. Overall NO x removal efficiency at 900 o C with NSR=1.5 had been improved from about 30% to 70.45% through the addition of sodium salts. Sodium salts as additive caused the flue gas to become alkaline gas, but it was not serious for sodium salts existing as NaNCO.

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Section: Technological Principles Of Reactionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental study of the influence of sodium salts as additive to NO x OUT process

Liang

Zhong

Jin

et al. 2010

Korean J. Chem. Eng.

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“…Flue gas cleaning is rarely used measure because of the complex equipment and expensive technologies [2]. Most commonly used measures for NOX reduction: a small amount of excess air, air distribution or flue gas recirculation to the combustion chamber [3].…”

Section: Introductionmentioning

confidence: 99%

NOx removal by NH3 and flammable additives in the selective non-catalytic reduction (SNCR) process

Sereika

Buinevičius

Puida

et al. 2017

mech

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“…Nevertheless, this narrow and relatively high temperature interval may be widened and also lowered by additive effects. Several additives have been tested and evaluated in the literature, such as CO and H 2 [2], alkanes (CH 4 , C 2 H 6 and C 4 H 10 ) [3], alcohols (CH 3 OH, C 2 H 5 OH and (CH 2 OH) 2 ) [4,5], volatile organic compounds (C 6 H 5 OH and C 7 H 8 ) [6], sodium compounds (Na 2 CO 3 , HCOONa, CH 3 COONa, and NaNO 3 ) [7], or other additives (C 2 H 4 , C 2 H 4 O, CH 3 CHO, CH 3 NH 2 , and pulverized coal) [5][6][7][8]. More recently, some works presented the effects of multicomponent gas additives, such as the combination of CO, H 2 , and CH 4 , on the SNCR process [9].…”

Section: Introductionmentioning

confidence: 99%

No Reduction by Selective Noncatalytic Reduction Using Ammonia-Effects of Additives

Dao

Gasnot

Bakali

et al. 2009

Inter J Ener Clean Env

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An experimental study of nitric oxide removal by selective noncatalytic reduction (SNCR) using ammonia as reducing agent has been performed in a semi-industrial reactor over the temperature range 973-1200 K. Several chemical compounds, such as CH4, C2H4, C2H6, CH3OH, C2H5OH, and CO, which are usually used in the literature as additives for the SNCR process, have been evaluated. As a result, very high efficiencies (up to 82%) have been achieved in our optimal experimental conditions with the classical SNCR process. The additives seem to make the NO reduction process more effective at lower temperatures. These additives induce a downward shift (up to more than 100 K) of the optimal temperature window for the reduction process, and a slight decrease of the maximum NO reduction level depending on the species and on the additive concentration. The additive utilization effectively decreases residual NH3 emissions.

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Experimental and modeling study of the effect of CH4 and pulverized coal on selective non-catalytic reduction process

Cited by 27 publications

References 20 publications

Experimental study of the influence of sodium salts as additive to NO x OUT process

Experimental study of the influence of sodium salts as additive to NO x OUT process

NOx removal by NH3 and flammable additives in the selective non-catalytic reduction (SNCR) process

No Reduction by Selective Noncatalytic Reduction Using Ammonia-Effects of Additives

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