Exhaust gas subsequent processing method and method therefor

A technology of metering device and conveying device, which is applied in exhaust treatment, exhaust device, muffler device, etc., can solve the problem of not setting heat exchange, save space, ensure anti-freezing protection, and save energy.

Active Publication Date: 2008-01-09
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] It has been known from DE 199 46 902 A1 to introduce an aqueous urea solution for nitrogen removal into the exhaust gas line behind the engine and to provide a return line from the delivery pump back to the urea container, which return line Used to reduce possible overpressure in the urea line or for venting the urea line, but especially in the critical case of freezing, especially outside the time of metering the reducing agent into the vent line , there is no continuous heat exchange between the aqueous urea solution and the parts of the exhaust aftertreatment device that are at risk of freezing

Method used

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  • Exhaust gas subsequent processing method and method therefor
  • Exhaust gas subsequent processing method and method therefor
  • Exhaust gas subsequent processing method and method therefor

Examples

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Embodiment Construction

[0018] FIG. 1 shows a device for aftertreatment of exhaust gases. Reference numeral 1 denotes a urea container from which aqueous urea solution is drawn by a delivery pump 4 via a line 1a, for example a hose line, with a non-return valve 2 and a filter 3 formed as a filter sieve and is drawn via Another check valve 6 feeds a metering valve 7 . The metering valve 7 meters the required aqueous urea solution into a mixing chamber 8 . A possible overflow of aqueous urea solution can be conveyed back to the urea container 1 via a return line 12 via a pressure regulator 5 and a further non-return valve 11 . Any necessary degassing of line 1 a takes place via a degassing circuit with a degassing valve 10 . Furthermore, reference numeral 20 denotes a compressed air container, from which compressed air can be introduced into the mixing chamber via a pressure limiter 21 , a 2 / 2-way valve 22 and a non-return valve 23 . The introduction of the reducing agent-air mixture from the mixing...

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Abstract

The invention relates to a method and device for subsequently treating exhaust gases of an internal combustion engine while using a reactant, particularly a reducing agent, which is to be introduced into the exhaust gases. According to the invention, the reactant is pumped by means of a delivery device (4), particularly a pump, out of a reactant reservoir (1) and to a dosing device (80), particularly a dosing valve so that after the dosing device is opened, the reactant can be introduced into an exhaust gas line of the internal combustion engine in a dosed manner (dosing operation). Reactant can be conveyed back from the delivery device (4) to the reactant reservoir (1) via a return line (12). The reactant can circulate between the delivery device (4) and the reactant reservoir (1) whereby, particularly when the dosing device is closed, preventing the reactant from freezing (freezing prevention).

Description

technical field [0001] The invention relates to a method and a device for exhaust gas aftertreatment of an internal combustion engine of the type according to the independent claims. Background technique [0002] It has been known from DE 199 46 902 A1 to introduce an aqueous urea solution for nitrogen removal into the exhaust gas line behind the engine and to provide a return line from the delivery pump back to the urea container, which return line Used to reduce possible overpressure in the urea line or for venting the urea line, but especially in the critical case of freezing, especially outside the time of metering the reducing agent into the vent line , no continuous heat exchange is provided between the aqueous urea solution and the parts of the exhaust gas aftertreatment device at risk of freezing. [0003] Furthermore, DE 102 54 981 A1 discloses removing reducing agent remaining in the reducing agent-carrying line after metering by means of compressed air. Content...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20B01D53/94B01D53/90
CPCB01D53/90Y02T10/24F01N3/2066F01N3/208B01D53/79F01N2610/1473F01N2610/02Y02A50/20Y02T10/12
Inventor B·巴尔欣
Owner ROBERT BOSCH GMBH
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