Thermal Analysis of Urea Tank Solution Warm Up for Selective Catalytic Reduction (SCR)

El-Sharkawy, Alaa; Kalantzis, Panagiotis D.; Syed, Muqsid A.; Snyder, David J.

doi:10.4271/2009-01-0971

Cited by 8 publications

(4 citation statements)

References 9 publications

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“…MEA is one of the bulk commodity chemicals widely used in industry as a gas-scrubbing agent for absorption and removal of CO 2 and H 2 S from refinery and natural gas streams [15], while its 50% aqueous solution has a very low freezing point (À50°C) [16]. In comparison, the freezing point of aqueous urea solution (32.5%) is À12°C [5].…”

Section: Introductionmentioning

confidence: 99%

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Autocatalytic synergism observed during lean-NO reduction with a bifunctional reductant over Ag/Al2O3 catalyst

Kim

Cho

et al. 2012

Journal of Catalysis

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Section: Introductionmentioning

confidence: 99%

“…However, both technologies have serious drawbacks that hamper their commercial application, such as an additional urea tank to be refilled periodically and heated to prevent freezing of the urea solution (urea-SCR) [5], and the high cost of noble metals with complex engine control (LNT) [6].…”

Section: Introductionmentioning

confidence: 99%

Autocatalytic synergism observed during lean-NO reduction with a bifunctional reductant over Ag/Al2O3 catalyst

Kim

Cho

et al. 2012

Journal of Catalysis

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“…Choi et al analyzed the capability of heating and melting system for urea tank, which system is circulated by engine coolant [18]. El-Sharkawy et al applied thermal analysis on the urea tank solution warm up for SCR system under low ambient temperature, and described heating system process for melting the frozen urea [19].…”

Section: Introductionmentioning

confidence: 99%

A CAN-Based Urea Line Heater Diagnostics Development and Experimental Validation for Selective Catalytic Reduction (SCR) System

2021

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Urea line heating system is critical for Selective Catalytic Reduction (SCR) aftertreatment system under low temperature environment. Traditionally, the Electronic Control Unit (ECU) motivates urea lines heating command and diagnostics directly. This paper illustrates a Controller Area Network (CAN)-based line heater architecture development for the SCR aftertreatment system, as well as the diagnostics generation. The CAN-based line heater diagnostics is validated on vehicle experimental with four different given cases. It can be seen from the validation results that the diagnostics logic and algorithm are reasonable, and the line heater failure modes could be detected correctly including open circuit, short circuit and inducement. In addition, the failure modes are able to set or clear for each of the urea lines according to the diagnostics logic. ECU and ECU1 could communicate well between each other by CAN. This study introduces a new line heater architecture for SCR aftertreatment system which is meaningful for the whole vehicle assembly, which could be considered in the real application in future.

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“…Stefan et al analyzed the melting of UWS by using a numerical analysis model in which an electric heating module was applied to an AdBlue Tank (UWS Tank) [18]. LLC Chrysler et al conducted a numerical analysis of the freezing and melting characteristics of a UWS tank by applying the method that uses the heat of the engine coolant and compared it with the operation test [19]. Choi et al applied a method that uses the heat of engine coolant to experimentally study the melting characteristics of UWS in a tank with the aim of ensuring that adequate UWS is consumed by the urea-SCR system of a vehicle at start-up; in addition, they performed a numerical analysis to determine the optimal shape of heating coils [20,21].…”

Section: Introductionmentioning

confidence: 99%

Melting and Heat Transfer Characteristics of Urea Water Solution According to a Heating Module’s Operating Conditions in a Frozen Urea Tank

Jeong

Jang

2021

Energies

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The urea-selective catalytic reduction (SCR) system, a nitrogen oxide reduction device for diesel vehicles, is a catalytic system that uses urea water solution (UWS) as a reducing agent. This system has a relatively wide range of operating temperatures. However, the freezing point of the reducing urea solution used in this system is −11 °C. When the ambient temperature dips below this freezing point in winter, the solution may freeze. Therefore, it is important to understand the melting characteristics of frozen UWS in relation to the operating conditions of the heating device to supply the minimum amount of aqueous solution required by the system in the initial stage of normal operation and startup of the urea–SCR system. In this study, we artificially froze a liquid solution by placing it along with a heating module in an acrylic chamber to simulate a urea solution tank. Two types of heating modules (P120 and P160) consisting of two heating elements and heat transfer bodies were used to melt the frozen solution. The melting characteristics of the frozen solution were observed, for example, changes in the temperature distribution around the heating module and the cross-sectional melting shape with the passage of time since the start of the power supply to the heating module. The shape of melting around the heating module differed depending on the level of UWS relative to the heater inside the urea tank. In case 1, it melted in a wide shape with an open top, and in case 2, it melted in a closed shape. This shape change was attributed to the formation of internal gaseous space due to volume reduction during melting and the heat transfer characteristics of the fluid and solid substances.

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Thermal Analysis of Urea Tank Solution Warm Up for Selective Catalytic Reduction (SCR)

Cited by 8 publications

References 9 publications

Autocatalytic synergism observed during lean-NO reduction with a bifunctional reductant over Ag/Al2O3 catalyst

Autocatalytic synergism observed during lean-NO reduction with a bifunctional reductant over Ag/Al2O3 catalyst

A CAN-Based Urea Line Heater Diagnostics Development and Experimental Validation for Selective Catalytic Reduction (SCR) System

Melting and Heat Transfer Characteristics of Urea Water Solution According to a Heating Module’s Operating Conditions in a Frozen Urea Tank

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