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A Computational Investigation of Industrial Selective .

Apr 09, 2018 · The selective catalytic reduction (SCR) is a promising NO x (a mixture of NO and NO 2) reduction technology for various applications.The SCR process entails the conversion of NO x by the .

Quasi 1D modeling of two-phase flow and deposit formation .

increase in exhaust mass flow can decrease the total weight of deposits on the pipe wall because of the promotion of the mass a nd heat transfer process both in the droplets and wall film. Key words: Selective catalytic reduction (SCR), Two-phase flow, Wall film, Deposit components, 1D model

US20060042234A1 - Control system for an engine .

An engine exhaust treatment system using a control system is described. In one form of the present invention, engine exhaust gas contaminates are passed through a selective reduction catalyst and a contaminate reducing agent is injected into the catalyst. The amount of contaminates present in the exhaust proximate to the selective reduction .

Comparison of reverse flow and counter-current reactors in .

Comparison of reverse flow and counter-current reactors in case of selective catalytic reduction of NOx 3 2. Problem Statement, background Our group recently investigated the behavior of a monolithic reactor operating in flow-reversal and counter-current reactor modes. The counter-current reactor

A Computational Investigation of Industrial Selective .

Apr 09, 2018 · The selective catalytic reduction (SCR) is a promising NO x (a mixture of NO and NO 2) reduction technology for various applications.The SCR process entails the .

A kinetic model for ammonia selective catalytic reduction .

Jun 24, 2008 · Kinetic modeling, in combination with flow reactor experiments, was used in this study for simulating NH 3 selective catalytic reduction (SCR) of NO x over Cu-ZSM-5. First the mass-transfer in the wash-coat was examined experimentally, by using two monoliths: one with 11 wt.% wash-coat and the other sample with 23 wt.% wash-coat.

Reverse flow reactors as sustainable devices for .

Jan 01, 2019 · Reverse flow reactor for the selective catalytic reduction of nitrogen oxides: evolution of concentration profiles during a half-cycle (300 s). . The mathematical model commonly used for reverse flow reactors is the continuous heterogeneous dynamic model, because of being particularly suited to model fast high exothermic or endothermic .

(735a) Detailed Kinetic Modeling of Selective Catalytic .

Nov 07, 2013 · mathematical model of the catalytic monolith reactor coupled with the detailed kinetic model is used to study the complex reaction system. The kinetic model developed .

Unsteady Analysis of NO Reduction over Selective Catalytic .

A heterogeneous 1D dynamic model of SCR−de-NOx (SCR = selective catalytic reduction) monolith reactors is developed, based on the concept of the "active" catalyst region. Its predictions are practically equivalent to those of a previous 2D model, but its numerical solution is faster by 1 order of magnitude, making it suitable for predictive control applications. The model is successfully .

Operating envelope of Haber–Bosch process design for power .

1.1 Haber–Bosch process The Haber–Bosch ammonia synthesis loop for producing NH 3 consists of mixing and compression units, synthesis reactor system, a trail of heat exchangers and coolers, a separator, a recycle loop and a storage unit. Altogether, it can be divided into four subsections, as shown in Fig. 1.The system design of the ammonia synthesis reactor .

Comparison of reverse flow and counter-current reactors in .

Abstract The paper is focused on the comparison between a reverse flow reactor (RFR) and a counter-current reactor (CCR) in terms of the performances that may be achieved in these kinds of reactors when selective catalytic reduction (SCR) of NO x with ammonia is carried out. In order to investigate the performances of both reactor configurations, a mathematical model .

Comparison of reverse flow and counter-current reactors in .

The paper is focused on the comparison between a reverse flow reactor (RFR) and a counter-current reactor (CCR) in terms of the performances that may be achieved in these kinds of reactors when selective catalytic reduction (SCR) of NO x with ammonia is carried out. In order to investigate the performances of both reactor configurations, a mathematical model based on heat and mass .

Comparison of reverse flow and counter-current reactors in .

Abstract The paper is focused on the comparison between a reverse flow reactor (RFR) and a counter-current reactor (CCR) in terms of the performances that may be achieved in these kinds of reactors when selective catalytic reduction (SCR) of NO x with ammonia is carried out. In order to investigate the performances of both reactor configurations, a mathematical model based on heat and mass .

Operating envelope of Haber–Bosch process design for power .

1.1 Haber–Bosch process The Haber–Bosch ammonia synthesis loop for producing NH 3 consists of mixing and compression units, synthesis reactor system, a trail of heat exchangers and coolers, a separator, a recycle loop and a storage unit. Altogether, it can be divided into four subsections, as shown in Fig. 1.The system design of the ammonia synthesis reactor .

Selective catalytic reduction of NO with hydrocarbons .

The U.S. Department of Energy's Office of Scientific and Technical Information

Ammonia Selective Catalytic Reduction of NO in a .

1.2 NH 3-SCR reactors The most common reactor used for NH 3-SCR is the fixed bed reactor, either with particulate or structured catalyst (Irfan et al., 2008). Fluidized beds (Tran et al., 2008), and reactors operating in forced unsteady state, such as loop reactors and reverse flow reactors (Noskov et al., 1993) have also been studied.

Modeling and simulation of a novel internal circulating .

The internal circulating fluidized bed (i-CFB) reactor exhibits an ability to overcome the negative impact of excessive O₂ present in the flue gas on selective catalytic reduction of NOx with hydrocarbons as the reductant (HC-SCR) by decoupling NOx adsorption and reaction into two separate zones. A mathematical model .

Numerical analysis of ammonia homogenization for selective .

Numerical analysis of ammonia homogenization for selective catalytic reduction application Jakov Baleta a, Matija Martinjakb, Milan Vujanović, Klaus Pachlerc, Jin Wangd, Neven Duića aFaculty of .

US20100122526A1 - Method of controlling the operation of a .

A method of controlling the feeding of a reducing agent, such as urea or ammonia, to a selective catalytic reduction reactor, which is operative for removing NOx from a process gas of a process plant, comprising the steps of estimating a present value of at least one predetermined parameter which is indicative of the amount of NOx that needs to be removed from said process gas in the selective .

SELECTIVE CATALYTIC REDUCTION OF NITROGEN OXIDES .

Mathematical modelling of the SCR of NOx in unsteady-state catalytic reactors ' _ 85 4.1. The one phase model _ 89 4.2. The two-phase model ; . 92 4.3. Simulation of forced unsteady state reactors 95 4.3.1. The reverse flow reactor (RFR) 95 4.3.2. Reactor network (RN) _ ;: 99 4.3.3. Comparison between RFR and RN 102 Chapter 5 Simplified models .

Modelling of the selective catalytic NOx reduction in .

Abstract. A mathematical model for the simulation of the selective catalytic reduction of NO x by ammonia in diesel exhaust is presented. The simulation of heat and mass transfer, and flow phenomena in a monolithic catalytic converter is performed by a previously published mathematical model.

In-Sik Nam's research works | Pohang University of Science .

In-Sik Nam's 137 research works with 3,949 citations and 3,987 reads, including: Effect of Hydrocarbon on DeNOx Performance of Selective Catalytic Reduction by Combined Reductant over Cu .

Honeycomb Reactor Washcoated with Mordenite Type Zeolite .

Jan 08, 1996 · A mathematical model for the design of extruded honeycomb reactor for selective catalytic reduction of NOx. 2006,,, 445-448. DOI: 10.1016/S0167-2991(06)81629-0. Alicia V. Boix, Eduardo A. Lombardo, Eduardo E. Miró. Effect of the Pt/Co ratio upon the catalytic .

NO forced unsteady state reactors

the mean outlet concentration of NH3 and NOx was investigated, as well as the response of these devices to perturbations in the pollutant feed concentration. Keywords Selective Catalytic Reduction, NOx removal, Reverse‐flow reactor, Reactors Network, Chromatographic reactor.

Reverse Flow Reactor with Side Feeding as a Novel Strategy .

Jul 29, 2020 · The simulation of dynamic reverse flow operation (RFO) with reactor side feeding for selectivity issue during exothermic reaction, while incorporating mass and energy balances both solid phase and gas phase, is presented in this paper with particular aim to investigate the product distribution.

Selective catalytic reduction of NO in a reverse-flow .

Selective catalytic reduction (SCR) with ammonia in fixed-bed (monolithic) reactors has stood out among other techniques in the last decades. In this work, the use of reverse-flow reactors, operated under the forced un-steady state generated by the periodic reversal of the flow .

Selective Catalytic Reduction of NOx with ammonia in .

Selective Catalytic Reduction of NOx . 2 -Department of Material Science and Chemical Engineering, Politecnico di Torino, Italy. Reverse Flow Reactor (RFR) vs. Reactor Network. Reaction mechanism: S S AB C B SB +→ +→ Process mathematical model.

Quasi 1D modeling of two-phase flow and deposit formation .

increase in exhaust mass flow can decrease the total weight of deposits on the pipe wall because of the promotion of the mass a nd heat transfer process both in the droplets and wall film. Key words: Selective catalytic reduction (SCR), Two-phase flow, Wall film, Deposit components, 1D model

EP1799975A4 - Control system for an engine aftertreatment .

An engine exhaust treatment system using a control system is described. In one form of the present invention, engine exhaust gas contaminates are passed through a selective reduction catalyst and a contaminate reducing agent is injected into the catalyst. The amount of contaminates present in the exhaust proximate to the selective reduction .

EXPERIMENTAL STUDY AND THEORETICAL MODELING OF .

Literature data were used to model coke-related deactivation at high coke levels, (up to 20%), greatly exceeding monolayer coverage.^ Experimentally, the effect of SO(,2) on the reaction rate for the selective catalytic reduction of NO by NH(,3) over a vanadia-alumina catalyst was examined in a flow reactor.