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SCP urea injection system for post treatment of diesel engine emissions

A urea injection system and exhaust post-treatment technology, which is applied in the direction of exhaust devices, mechanical equipment, engine components, etc., can solve the problems of large fluctuations in the injection volume of urea solution, poor accuracy and stability, etc., and achieve the elimination of adverse effects. Effect of pressure wave in small tube, improving measurement accuracy and stability

Active Publication Date: 2010-06-16
CHINA FIRST AUTOMOBILE
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Problems solved by technology

Therefore, the injection amount of urea solution fluctuates greatly, and the accuracy and stability are poor

Method used

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  • SCP urea injection system for post treatment of diesel engine emissions
  • SCP urea injection system for post treatment of diesel engine emissions
  • SCP urea injection system for post treatment of diesel engine emissions

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Embodiment Construction

[0014] The SCR urea injection system for diesel engine exhaust aftertreatment according to the present invention, the working principle of its embodiment is as follows figure 1 shown. The urea solution prepared according to the international standard ISO22241-1 is stored in the urea solution tank 1 . The solution flows into the delivery pump 5 through the outlet valve 2 and the filter 4 . The delivery pump 5 adopts a large flow pump, and its flow rate can reach more than 500% of the urea injection volume required by the system. The urea solution supplied by the delivery pump 5 is used as a reducing agent to spray into the exhaust pipe 11 of the diesel engine, and the excess urea solution is used for cooling the urea nozzle 14 . The urea solution used for cooling flows back to the urea solution tank 1 through the one-way valve 16 , the pressure control valve 17 , the return pipe 22 , the cooler 18 and the return valve 20 . The temperature of the urea solution can be adjusted...

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Abstract

The invention discloses an SCP urea injection system for the post treatment of diesel engine emissions, which belongs to internal combustion engine waste gas purification systems, comprises a urea solution box, a conveying pump, a filter, a urea nozzle, a pressure sensor and a temperature sensor, and is characterized in that the urea injection system comprises an energy accumulator, a large-capacity injection accommodating cavity and a device for heating urea solution by diesel exhaust, wherein the energy accumulator is connected with a main pipeline of the system in parallel and is used for stabilizing the pressure of the main pipeline; the large-capacity injection accommodating cavity is directly connected with the urea nozzle; and the device for heating the urea solution by the diesel exhaust comprises a waste gas inlet pipe, a temperature control valve, a waste gas outlet pipe and the like, wherein the urea nozzle adopts a pintle type nozzle which can prevent the urea from being crystallized at a low temperature to block an injection orifice. The system can realize precise and reliable injection metering of the urea solution.

Description

technical field [0001] The present invention relates to an SCR urea injection system for aftertreatment of exhaust gas of diesel engine, more specifically, relates to a selective catalytic reduction system (Selective Catalyst Reduction) for reducing NOx emission of diesel engine, which belongs to exhaust gas purification system of internal combustion engine. Background technique [0002] The international standard ISO22241-1 specifies the quality requirements for NOx reducing agent AUS32 for diesel engines. This is an aqueous urea solution with a urea content of 32.5% and an initial crystallization temperature of -11.5°C. When the urea solution is transported and stored at a temperature exceeding 30°C, it will be hydrolyzed and ammonia gas will be released. Therefore, the temperature of the urea solution in the urea injection system must be properly controlled. [0003] The existing SCR urea injection system has been applied to vehicle diesel engines that are required to m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/08
CPCY02T10/24Y02T10/12
Inventor 吴君华朱明健孔亮王晓勇
Owner CHINA FIRST AUTOMOBILE
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