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Temperature-based control of reagent distribution

A technology of reagents and catalysts, which is applied in the field of diesel engine exhaust aftertreatment systems, can solve problems such as ineffective operation and lower overall system efficiency

Active Publication Date: 2022-05-03
WATLOW ELECTRIC MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Injecting urea only when the exhaust stream is warm enough will reduce the overall efficiency of the system (as it will not operate efficiently under certain operating conditions)

Method used

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  • Temperature-based control of reagent distribution

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Embodiment Construction

[0020] The following description is merely exemplary in nature and is in no way intended to limit the disclosure, its application or uses. It should also be understood that steps within a method may be executed in different order without altering the principles of the present disclosure.

[0021] refer to figure 1 , shows a diesel exhaust aftertreatment system in accordance with the teachings of the present disclosure and is generally indicated by reference numeral 20 . Diesel exhaust aftertreatment system 20 includes a fluid injection conduit 24 coupled to reagent source 18 upstream of catalyst 16 (which in this form is selective catalytic reduction (SCR)) and to the diesel exhaust flow 12. The system 20 also includes a heater 26 operably connected to the injection conduit 24, wherein, in one form, the heater 26 heats the reagent flowing through the injection conduit 24 to decompose the reagent before being injected into the diesel exhaust stream. The state of matter is at...

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Abstract

The present disclosure provides a method of treating a diesel exhaust system, the method comprising: heating a reagent to a temperature such that at least a portion of the reagent is heated into a gas phase, injecting the reagent into the diesel exhaust stream upstream of the catalyst, and by Catalysts react diesel exhaust with heated reagents to convert NO x converted to N 2 and H 2 O. The heating regulates the mass flow rate of the reagent by at least partially converting the reagent's state of matter into the gas phase, and the heated reagent in gaseous form reduces the formation of deposits within the diesel exhaust system.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to and benefit from U.S. Provisional Application Serial No. 62 / 520,959, filed June 16, 2017. The disclosures of the aforementioned applications are incorporated herein by reference in their entirety. technical field [0003] The present disclosure relates to diesel exhaust aftertreatment systems, and more particularly to systems for injecting urea into a diesel exhaust stream upstream of a catalyst to reduce harmful emissions. Background technique [0004] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art. [0005] Many diesel exhaust aftertreatment systems use SCR (Selective Catalytic Reduction) to reduce NO x (nitrogen oxides) emissions. SCR systems use catalysts to boost NO x Reacts with ammonia to form N 2 and H 2 O. Typically, ammonia is supplied to the catalyst by injection of urea in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/20F01N3/08
CPCF01N3/0842F01N2240/02F01N2240/16F01N2240/25F01N2610/06F01N2610/10F01N2610/102F01N2610/105F01N2610/144F01N2610/1453F01N2610/146F01N2900/0416F01N2900/0602F01N2900/08F01N2900/12F01N2900/1402F01N2900/1404F01N2900/1411F01N2900/1602F01N2900/1812F01N2900/1818F01N3/208F01N2560/06F01N2610/02F01N2900/1811Y02T10/12Y02A50/20F01N11/00F01N2560/026F01N2560/07
Inventor 马克·丹尼斯·埃弗利保罗·道格拉斯·弗里杰弗里·迪斯特尔迈尔安德鲁·D·塞尔维
Owner WATLOW ELECTRIC MFG