Selective catalytic reduction failure of low NH3-NO  ratio

Tan, Piqiang; Li, Xiaoyü; Wang, Shiyan; Hu, Zhiyuan; Lou, Diming

doi:10.1016/j.cjche.2020.07.055

Cited by 6 publications

(3 citation statements)

References 28 publications

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“…Diao et al 29 conducted a study on the performance of diesel SCR urea pumps through bench tests, and the results showed that as the urea injection volume increased, the NO x conversion efficiency increased and NO x emissions downstream of SCR decreased significantly, but when the urea injection volume increased to a certain level, it caused a significant increase in ammonia escape. Tan et al 30 conducted an experimental study of selective catalytic reduction failure at low ammonia-to-nitrogen ratios and their urea injection deficiency test results showed that as the urea injection increased, the ammonia-to-nitrogen ratio increased and the NO x conversion efficiency rose, but ammonia leakage also increased.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on NO_x Reduction of Diesel Engine by EGR Coupled with SCR

Zhang,

Nie,

et al. 2024

ACS Omega

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Exhaust gas recirculation (EGR) and selective catalytic reduction (SCR) are crucial technologies for mitigating nitrogen oxide (NO x ) emissions in diesel engines. Although EGR reduces engine outlet NO x emissions, it simultaneously increases diesel consumption, leading to a poor economic performance. SCR requires AdBlue consumption; thus, striking the right balance for overall engine economy is of utmost importance. This study aims to evaluate NO x emission control and fluid cost in diesel engines. The total fluid cost of the diesel engine includes diesel and AdBlue. The engine is equipped with an aftertreatment system comprising a diesel oxidation catalyst (DOC), diesel particulate filter (DPF), selective catalytic reduction (SCR), and ammonia slip catalyst (ASC). The study was carried out at 1600 and 2100 rpm (25, 50, 75, and 100% load). The results show that with the increase of EGR valve opening, the exhaust temperature increased, the brake-specific fuel consumption (BSFC) increased, and the NO x emission decreased. With the increased AdBlue dosage, the NO x conversion efficiency gradually improved, ultimately approaching near-zero NO x emissions. However, as NO x emissions decreased, the equivalent diesel fluid cost rose. At 1600 r/min (100% load), when the NO x emissions were reduced by zero, the maximum fluid costs were 235, 223, and 218g/(kW•h) under the AdBlue/diesel price ratios of 1/1, 1/2, and 1/3, respectively. As the AdBlue/diesel price ratio decreases, the influence of EGR on the fluid cost diminishes. Coordinated control of EGR and AdBlue allows for reduced NO x emissions while mitigating the overall cost of diesel engines and aftertreatment systems. This research provides valuable guidance for EGR and urea control in diesel engines and contributes to the field of diesel engine emission control.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on NO_x Reduction of Diesel Engine by EGR Coupled with SCR

Zhang,

Nie,

et al. 2024

ACS Omega

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“…Flue gas denitrification by oxidation is to oxidize the slightly soluble NO in NO x into soluble NO 2 , HNO 3 , or N 2 O 5 for further wet removal. , This promising denitrification method avoids the leakage risk of NH 3 when adopting the traditional selective catalytic reduction (SCR) technology , and is suitable for flue gas denitrification at low temperature. , Common oxidants in oxidation denitration include O 3 , ClO 2 , or H 2 O 2 solution after vaporization, Fe[VI], and sodium persulfate . Among them, H 2 O 2 is a green and low-cost oxidizer, but its oxidation capacity is weaker (1.77 eV) than that of O 3 (2.08 eV) and ·OH (2.80 eV).…”

Section: Introductionmentioning

confidence: 99%

An Efficient and Green Method for Flue Gas NO Removal by Steel Slag Flue Gas Desulfurization Tail Liquid

Ren

Zhang

2023

Energy Fuels

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The tail liquid of steel slag flue gas desulfurization contains a large amount of FeSO 4 , which is potentially able to remove NO from flue gas by catalyzing the oxidation of H 2 O 2 . In this paper, desulfurization slurry with different sulfation degrees was obtained by controlling the reaction time of steel slag flue gas desulfurization, and then the slurry was further processed to acquire the catalyst containing FeSO 4 . Through the comparison of the catalytic performance of catalysts with different sulfation degrees, it was found that the catalyst with a sulfation degree of 70% had the best catalytic performance, and the removal rate of NO by catalytic oxidation of H 2 O 2 could reach 90%. In addition, the long-term catalytic test proved that it possessed stable and efficient catalytic performance. The catalytic reaction time was prolonged due to the complex structure of the catalyst, and its efficient catalytic ability was also correlated to the desulfurization product FeSO 4 attached to the silica gel surface with a high specific surface area. According to the calculation, 486.9 kg of the catalyst could be prepared per ton of steel slag flue gas desulfurization, showing low preparation cost and great application value.

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“…In addition, the process involves the hydrolysis of urea to produce NH 3 , which is slow during engine startup time due to lower temperatures in the SCR system. Thus, there is a delay in the supply of NH 3 in the SCR reaction, which may let some NOx into the environment and may lead to deposit formation in the pipe lines [ 5 ]. The problem can be overcome by using solid NH 3 carriers that supply NH 3 without delay and can work at low temperatures without solid deposit formation [ 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

3D-printed zeolite 13X-Strontium chloride units as ammonia carriers

Shezad,

D'Agostini,

Ezzine

et al. 2023

Heliyon

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Selective catalytic reduction failure of low NH3-NO ratio

Cited by 6 publications

References 28 publications

Experimental Study on NO_x Reduction of Diesel Engine by EGR Coupled with SCR

Experimental Study on NO_x Reduction of Diesel Engine by EGR Coupled with SCR

An Efficient and Green Method for Flue Gas NO Removal by Steel Slag Flue Gas Desulfurization Tail Liquid

3D-printed zeolite 13X-Strontium chloride units as ammonia carriers

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Selective catalytic reduction failure of low NH3-NO ratio

Cited by 6 publications

References 28 publications

Experimental Study on NOx Reduction of Diesel Engine by EGR Coupled with SCR

Experimental Study on NOx Reduction of Diesel Engine by EGR Coupled with SCR

An Efficient and Green Method for Flue Gas NO Removal by Steel Slag Flue Gas Desulfurization Tail Liquid

3D-printed zeolite 13X-Strontium chloride units as ammonia carriers

Contact Info

Product

Resources

About

Experimental Study on NO_x Reduction of Diesel Engine by EGR Coupled with SCR

Experimental Study on NO_x Reduction of Diesel Engine by EGR Coupled with SCR