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Study on the NOx release rule along the boiler during pulverized coal combustion

JIN Jing, ZHANG Zhongxiao, LI Ruiyang

Frontiers in Energy 2007, Volume 1, Issue 1,   Pages 91-95 doi: 10.1007/s11708-007-0009-7

Abstract: Numerical simulation and experimental study on NO release along the boiler during pulverized coal combustion have been conducted. With the increase of temperature the NO emission increased and the peak value of NO release moved forward. But when the temperature increased to a certain degree, NO emission began to reduce. NO emission increased with the increase of nitrogen content of coal. The peak value of NO release moved backwards with the increase of coal rank. NO emission increased obviously with the increase of stoichiometric ratio. There existed a critical average diameter of the pulverized coal (). If "d, NO emission reduced with the decrease of pulverized coal size. If >, NO emission reduced with the increase of the pulverized coal size. The results showed that the simulation results are in agreement with the experimental results for concentration distribution of NO along the axis of the furnace.
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Selective catalytic reduction of NOx from exhaust of lean-burn engine over Ag-Al2O3/cordierite catalyst

LI Junhua, KANG Shoufang, FU Lixin, HAO Jiming

Frontiers of Environmental Science & Engineering 2007, Volume 1, Issue 2,   Pages 143-146 doi: 10.1007/s11783-007-0025-1

Abstract: A highly effective Ag-AlO catalyst was prepared using the sol-gel method, and characterized by surface area using nitrogen adsorption, scanning electron microscopy (SEM), and transmission electron microscopy (TEM) techniques. The catalyst performance was tested on a real lean-burn gasoline engine. Only unburned hydrocarbons and carbon monoxide in the exhaust were directly used as reductant (without any external reductant), the maximum NO conversion could only reach 40% at 450?C. When an external reductant, ethanol was added, the average NO conversion was greater than 60%. At exhaust gas temperature range of 350 500?C, the maximum NO conversion reached about 90%. CO and HC could be efficiently oxidized with Pt-AO oxidation catalyst placed at the end of SCR converter. However, NO conversion drastically decreased because of the oxidation of some intermediates to NO again. The possible reaction mechanism was proposed as two typical processes, nitration, and reduction in HC-SCR over Ag-AlO.

Keywords： lean-burn gasoline     external reductant     nitrogen adsorption     conversion     catalyst performance    

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NOx removal by non-thermal plasma reduction: experimental and theoretical investigations

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 10,   Pages 1476-1484 doi: 10.1007/s11705-022-2165-z

Abstract: Green and efficient NOx removal at low temperature is still desired. NOx removal via non-thermal plasma (NTP) reduction is one of such technique. This work presents the experimental and theoretical study on the NOx removal via NTP reduction (NTPRD) in dielectric barrier discharge reactor (DBD). The effect of O2 molar fraction on NOx species in the outlet of DBD, and effects of NH3/NO molar ratio and discharge power of DBD on NOx removal efficiency are investigated. Results indicate that anaerobic condition and higher discharge power is beneficial to direct removal of NOx, and the NOx removal efficiency can be up to 98.5% under the optimal operating conditions. It is also found that adding NH3 is favorable for the reduction of NOx to N2 at lower discharge power. In addition, the NOx removal mechanism and energy consumption analysis for the NTPRD process are also studied. It is found that the reduced active species ( N∗, N−, N+, N2∗, NH2+, etc.) generated in the NTPRD process play important roles for the reduction of NOx to N2. Our work paves a novel pathway for NOx removal from anaerobic gas in industrial application.

Keywords： ${\rm{NO}}_x $ removal     NTP reduction     mechanism     energy consumption    

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Time-varying formation tracking for uncertain second-order nonlinearmulti-agent systems

Mao-peng RAN, Li-hua XIE, Jun-cheng LI

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 1,   Pages 76-87 doi: 10.1631/FITEE.1800557

Abstract:

Our study is concerned with the time-varying formation tracking problem for second-order multi-agentnonlinear dynamics and external disturbance, and the states of the followers form a predefined time-varying formationThen we propose a novel ESO based time-varying formation tracking protocol.It is proved that, under the proposed protocol, the ESO estimation error and the time-varying formation

Keywords： Multi-agent system     Time-varying formation     Formation tracking     Nonlinear dynamics     Extended state observer    

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3D finite element prediction of chip flow, burr formation, and cutting forces in micro end-milling of

A. DAVOUDINEJAD, P. PARENTI, M. ANNONI

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 2,   Pages 203-214 doi: 10.1007/s11465-017-0421-6

Abstract: performed under different cutting conditions to obtain realistic numerical predictions of chip flow, burr formationadvantages, such as capability to easily handle any type of tool geometry and any side effect on chip formation

Keywords： 3D finite element modeling     micro end-milling     cutting force     chip formation     burr formation    

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Mechanistic insight into the biofilm formation and process performance of a passive aeration ditch (PAD

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 7, doi: 10.1007/s11783-021-1494-3

Abstract:

• A Passive Aeration Ditch was developed to treat decentralized wastewater.

Keywords： Decentralized wastewater     Passive aeration ditch     Biofilm formation     C/N ratio     Salinity     Model simulation    

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Is atmospheric oxidation capacity better in indicating tropospheric O formation?

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 5, doi: 10.1007/s11783-022-1544-5

Abstract: ItemContent>

● This study summarizes and evaluates different approaches that indicate O3 formation

Keywords： O3     AOC     O3 formation regime    

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Formation mechanism and modeling of surface waviness in incremental sheet forming

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 2, doi: 10.1007/s11465-022-0679-1

Abstract: In this paper, the formation mechanism and the prediction of waviness are both investigated through experimentsThis work is favorable for the perfection of formation mechanism and control of surface quality in ISF

Keywords： surface waviness     incremental sheet forming     numerical simulation     formation mechanism     deformation history    

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New insights into the formation of ammonium nitrate from a physical and chemical level perspective

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 11, doi: 10.1007/s11783-023-1737-6

Abstract:

● Factor analysis of ammonium nitrate formation based on thermodynamic

Keywords： Ammonium nitrate formation     Thermodynamic theory     Aerosol liquid water content     Source apportionment    

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High-precision standard enthalpy of formation for polycyclic aromatic hydrocarbons predicting from general

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 12,   Pages 1743-1750 doi: 10.1007/s11705-022-2184-9

Abstract: The standard enthalpy of formation is an important predictor of the reaction heat of a chemical reactionIn this work, a high-precision method was developed to calculate accurate standard enthalpies of formationcomputational results, it was found that the present method can give a good description of enthalpy of formation

Keywords： standard enthalpy of formation     polycyclic aromatic hydrocarbons     connectivity based hierarchy     high-precision    

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The formation mechanism and the influence factor of residual stress in machining

Zhaoxu QI,Bin LI,Liangshan XIONG

Frontiers of Mechanical Engineering 2014, Volume 9, Issue 3,   Pages 265-269 doi: 10.1007/s11465-014-0311-0

Abstract: The paper presents a method of theoretical analysis in order to explicate the formation mechanism ofAnd these influences are explained from the perspective of formation mechanism of residual stress in

Keywords： residual stress     analytical model     strain     plastic     cutting parameter    

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Subsurface damage pattern and formation mechanism of monocrystalline -GaO in grinding process

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 2, doi: 10.1007/s11465-022-0677-3

Abstract: The aim of this study is to investigate the damage pattern and formation mechanism of monocrystallineThe formation of nanocrystals and amorphous phase was related to the grinding conditions and material

Keywords： monocrystalline beta-phase gallium oxide     grinding process     subsurface damage     nanocrystals     amorphous phase    

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Key features of new particle formation events at background sites in China and their influence on cloud

Xiaojing SHEN,Junying SUN,Xiaoye ZHANG,Yangmei ZHANG,Lu ZHANG,Ruxia FAN

Frontiers of Environmental Science & Engineering 2016, Volume 10, Issue 5, doi: 10.1007/s11783-016-0833-2

Abstract: New particle formation (NPF) event at multi rural sites in China Identifying the characteristics of NPFdistributions with mobility diameter sizes ranging from 3 to 800 nm were performed to study new particle formationThe mean formation rate of 3-nm particles was 6.3, 3.7, and 5.8 cm ·s , and the mean particle growthThe formation rate of NPF events at these sites, as well as the condensation sink, is approximately 10

Keywords： New particle formation     Regional background     Cloud condensation nuclei     Growth rate     Formation rate    

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Characteristics of typical dissolved black carbons and their influence on the formation of disinfection

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 12, doi: 10.1007/s11783-022-1585-9

Abstract:

● The physicochemical and structural properties of DBC were characterized.

Keywords： black carbon (DBC)     Chlorine     Chloramine     Disinfection by-products (DBPs)     Disinfection by-products formation    

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Strategies on designing multifunctional surfaces to prevent biofilm formation? ?

Yang Lu,Zhanguo Yue,Wei Wang,Zhiqiang Cao

Frontiers of Chemical Science and Engineering 2015, Volume 9, Issue 3,   Pages 324-335 doi: 10.1007/s11705-015-1529-z

Abstract: Bacteria adhesion and biofilm formation have raised severe problems on public health, food industry and

Keywords： antimicrobial     surface     multifunctional    

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Title Author Date Type Operation

Study on the NOx release rule along the boiler during pulverized coal combustion

JIN Jing, ZHANG Zhongxiao, LI Ruiyang

Journal Article

Selective catalytic reduction of NOx from exhaust of lean-burn engine over Ag-Al2O3/cordierite catalyst

LI Junhua, KANG Shoufang, FU Lixin, HAO Jiming

Journal Article

NOx removal by non-thermal plasma reduction: experimental and theoretical investigations

Journal Article

Time-varying formation tracking for uncertain second-order nonlinearmulti-agent systems

Mao-peng RAN, Li-hua XIE, Jun-cheng LI

Journal Article

3D finite element prediction of chip flow, burr formation, and cutting forces in micro end-milling of

A. DAVOUDINEJAD, P. PARENTI, M. ANNONI

Journal Article

Mechanistic insight into the biofilm formation and process performance of a passive aeration ditch (PAD

Journal Article

Is atmospheric oxidation capacity better in indicating tropospheric O formation?

Journal Article

Formation mechanism and modeling of surface waviness in incremental sheet forming

Journal Article

New insights into the formation of ammonium nitrate from a physical and chemical level perspective

Journal Article

High-precision standard enthalpy of formation for polycyclic aromatic hydrocarbons predicting from general

Journal Article

The formation mechanism and the influence factor of residual stress in machining

Zhaoxu QI,Bin LI,Liangshan XIONG

Journal Article

Subsurface damage pattern and formation mechanism of monocrystalline -GaO in grinding process

Journal Article

Key features of new particle formation events at background sites in China and their influence on cloud

Xiaojing SHEN,Junying SUN,Xiaoye ZHANG,Yangmei ZHANG,Lu ZHANG,Ruxia FAN

Journal Article

Characteristics of typical dissolved black carbons and their influence on the formation of disinfection

Journal Article

Strategies on designing multifunctional surfaces to prevent biofilm formation? ?

Yang Lu,Zhanguo Yue,Wei Wang,Zhiqiang Cao

Journal Article