Development, Application and Direction of Development of Urea-SCR

Qi, Zhanfeng; Li, Shusen; Guo, Xing‐Min

doi:10.14257/ijmue.2016.11.6.12

Cited by 5 publications

(6 citation statements)

References 14 publications

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“…where w is the displacement of rigid inclusion; u is the phase angle; e is the eccentricity; l is the length of connecting rod, l= e/l; v is the angular velocity; b is the radius of rigid inclusion; R is the effective outer radius of diaphragm; and S is the distance between the top and bottom dead center, S = 2e. The displacement function applied on the rigid inclusion is described as equations (6) and (7).…”

Section: Structure Modelmentioning

confidence: 99%

“…1–5 The pump that is widely used in non-air-assisted Urea-SCR system is one of the miniature diaphragm pumps. 6,7…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5] The pump that is widely used in non-air-assisted Urea-SCR system is one of the miniature diaphragm pumps. 6,7 The disadvantage of diaphragm pump is the pressure pulsation that occurs due to the periodic change of pump working chamber volume and opening of the port valves, which can lead to vibration of piping system. 8,9 In addition, the interaction between the diaphragm and fluid, check valve and fluid make it very difficult to precisely predict the dynamic performance of diaphragm pump.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on dynamic characteristics of a plate-type discharge valve in a diaphragm pump for SCR system by two-way FSI model

Shi

Yang

Pan

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part D:

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A plate-type port valve with rubber valve plate in a miniature diaphragm pump is presented. To investigate the dynamic characteristics of this type of discharge valve, a two-way fluid structure interaction model is proposed. The interaction between the dynamic behavior of the fluid and rubber is considered in the fluid structure interaction model. Based on the fluid structure interaction model, the internal flow of the pump, the deflection of the diaphragm and discharge valve plate is calculated. To verify the validity of the numerical model, a prototype pump is fabricated and tested. The experimental pressures in the working chamber of the pump show the same overall trends with the numerical results. The deviations between the numerical and experimental flowrates are less than 7.2%. The experimental results prove that the numerical model is effective in predicting a complete discharge process of the pump. There is a big difference between the deflection of the center of the valve plate and the edge of the valve plate. The oscillation period of the pressure in the working chamber of the pump is approximately double that of the discharge valve plate. When the pump speed is lower than 2500 r/min, it has little influence on the lag angles of the discharge valve under rated pressure. The lag angles at rated pump speed increase when the backpressures increase. The stress of the discharge valve plate reaches a peak when the valve plate impact on the valve limiter or valve seat.

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Section: Structure Modelmentioning

confidence: 99%

“…1–5 The pump that is widely used in non-air-assisted Urea-SCR system is one of the miniature diaphragm pumps. 6,7…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigation on dynamic characteristics of a plate-type discharge valve in a diaphragm pump for SCR system by two-way FSI model

Shi

Yang

Pan

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…The associate editor coordinating the review of this manuscript and approving it for publication was Jenny Mahoney. and reduce NH 3 slip [11], [12]. NH 3 is also harmful to the environment.…”

Section: Introductionmentioning

confidence: 99%

“…Only a few studies have focused on the pressure pulsation of UDSs, which can directly influence the precision of UWS dosing and the spray characteristics of the UWS. The pump widely used in non-air-assisted UDSs (NAUDSs) is a high-speed diaphragm pump, which can cause serious pressure pulsation in pipelines [12], [19]. Many researchers have reported the pressure pulsation of diaphragm pumps [20]- [22].…”

Section: Introductionmentioning

confidence: 99%

Effects of a Bladder Accumulator on Pressure Pulsation of Urea Dosing System

et al. 2019

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Non-air-assisted urea dosing systems (NAUDSs) with diaphragm pump are usually used in selective catalytic reduction (SCR) systems to supply the urea water solution. The system pressure pulsation caused by diaphragm pump can significantly reduce the injecting precision of NAUDSs and further decrease the conversion efficiency of the SCR systems. Therefore, this study aimed to reduce the system pressure pulsation by installing a bladder accumulator in a NAUDS. The bladder accumulator could effectively absorb the system pressure pulsation. A numerical model was proposed to study the effects of the bladder accumulator on the pressure pulsation of the NAUDS. The software Amesim 15.0 R and ADINA 9.3 R were used to develop a new submodel for the bladder accumulator and the diaphragm pump in the NAUDS. Simulation results show that the pressure pulsation of the NAUDS mainly depended on the bladder accumulator parameter. Reducing bladder thickness, bladder elasticity modulus, and bladder accumulator stiffness significantly decreased the system pressure pulsation. When the stiffness of the bladder accumulator was lower than 5×10 11 Pa/m 3 , the pulsation ratio of system pressure reduced to below 5%. A test system was built to validate the numerical model. The test data of the system pressure showed almost the same change trend as the simulation results. Thus, the proposed numerical model can effectively predict the dynamic behavior of the NAUDS, and the results may serve as a reference for the design of similar NAUDSs.INDEX TERMS Selective catalytic reduction (SCR), non-air-assisted urea dosing system (NAUDS), diaphragm pump, pressure pulsation, bladder accumulator.

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