Reactant metering and delivering device for internal combustion engine tail gas purification and aftertreatment system

A technology of exhaust gas purification and conveying device, which is used in exhaust gas treatment, exhaust device, internal combustion piston engine, etc., can solve problems such as the failure of the urea solution system to work properly, the easy dehydration and crystallization at the urea outlet of the metering pump, and the damage of the urea metering device.

Active Publication Date: 2015-05-20
湖北洛特福环保设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main technical problem to be solved by the present invention is to provide a reactant metering and delivery device for an internal combustion engine exhaust gas purification post-treatment system, which solves the problem of volume expansion of urea (the reactant in this invention usually refers to urea) solution when it freezes in cold weather. The urea metering device is damaged, and the system cannot work normally due to the dehydration and crystallization of the urea solution at the junction with the air when the system is not in use for a long time
Secondly, the present invention also solves the problem of easy dehydration and crystallization at the urea outlet of the metering pump

Method used

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  • Reactant metering and delivering device for internal combustion engine tail gas purification and aftertreatment system
  • Reactant metering and delivering device for internal combustion engine tail gas purification and aftertreatment system
  • Reactant metering and delivering device for internal combustion engine tail gas purification and aftertreatment system

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Such as figure 1 As shown, an airless vehicle exhaust aftertreatment system: including engine 608, exhaust pipe 609, nozzle 607, SCR catalyst 611, SCR pre-SCR temperature and NOx sensor 603, SCR post-SCR temperature and NOx sensor 604, coolant circulation control Valve 606, urea storage tank 700, heat exchanger 612 and urea metering device 1000;

[0035] The pre-SCR temperature and NOx sensor 603, the nozzle 607, the SCR catalyst 611, and the post-SCR temperature and NOx sensor 604 are sequentially arranged on the exhaust pipe 609;

[0036] The metering device 1000 is integrated with the urea storage tank 700 .

[0037] A urea filling port (not shown) and a pressure regulating valve 613 are also installed on the top of the urea storage tank 700 . The urea storage tank 700 has a built-in heat exchanger 612, which is connected with the cooling circulation liquid of the engine 608. When the urea needs to be heated in cold weather, the controller 600 opens the engine cool...

Embodiment 2

[0042] On the basis of Embodiment 1, different from Embodiment 1, as a further improvement, in order to protect the internal core parts of the metering pump from being damaged due to the expansion of the urea freezing volume, a or multiple deformable bodies, such as image 3 shown. The deformable body can be made of appropriate materials, and there is little deformation in the working pressure range of the metering pump (generally less than 10bar), or the amount of deformation is known, so that the metering accuracy will not be significantly affected; but at higher pressures (such as greater than 10bar), it is easy to deform elastically, so that when the urea freezes and expands, it can absorb the pressure in the liquid cavity inside the metering pump, and avoid damage to other parts in the metering pump due to excessive pressure. After the urea solution is thawed and the pressure in the pump returns to normal, the deformable body returns to its original shape.

Embodiment 3

[0044] Such as Figure 4 As shown, on the basis of Embodiment 1, air assistance is added to form an air-assisted vehicle exhaust after-treatment system. At this time, the difference from Embodiment 1 is that the urea metering device 1000 further includes an air switching valve 100 . The air switching valve 100 is connected with the controller 600 through wires and is controlled by the controller 600 to switch. The inlet end of the air switch valve 100 introduces compressed air into the air control valve 100 through the air delivery pipe 101 , and the outlet end is firstly connected to the metering pump 200 through the injection pipe 402 , and then connected to the nozzle 607 in series.

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Abstract

Disclosed is a urea metering and conveying device of a tail gas clean-up post-treatment system of an internal-combustion engine. The urea metering and conveying device comprises a urea metering device (1000), a spray nozzle (607) and a urea storage tank (700), wherein urea is contained in the urea storage tank (700); and the urea metering device (1000) comprises a metering pump (200) and a controller (600), wherein the metering pump (200) is installed inside the urea storage tank (700) and is immersed in the urea, the metering pump (200) is connected to the controller (600) and is connected to the spray nozzle (607) through an injection pipe (402), and the controller (600) is installed on the top portion or the outer portion of the urea storage tank (700). The urea metering and conveying device can avoid the situation in which components coming into contact with urea are damaged because a urea solution is frozen in inclement weather, and can also avoid the situation in which the system cannot operate normally due to the dehydration and crystallization of urea.

Description

technical field [0001] The invention relates to a reactant conveying and metering device, in particular to a reactant metering and conveying device for an internal combustion engine tail gas purification post-treatment system. Background technique [0002] The reactant currently used for aftertreatment of diesel engines is aqueous urea. The integration of the urea delivery and metering system on the urea tank not only saves installation space and manufacturing costs, but more importantly makes the system more reliable. One of the arrangements is to put the urea metering pump in the urea tank and soak it in the urea solution. Since the urea solution will freeze at low temperature, the volume expansion will produce great stress during freezing, which will easily cause damage to the urea pump and other devices immersed in the urea solution. In addition, for the air-assisted injection system, the junction of the urea outlet and the air is prone to crystallization due to dehydr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/28
CPCB01D53/90B01D53/9431B01D53/9495B01D2251/2067F01N3/208F01N2610/02F01N2610/10F01N2610/1406F01N2610/1433Y02T10/12
Inventor 李平
Owner 湖北洛特福环保设备有限公司
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