Anti-urea-crystallization diesel engine post-treatment heating mixing device
A technology for heating and mixing diesel engines, applied in exhaust treatment, muffler devices, exhaust devices, etc., can solve the problems of reducing conversion efficiency, low exhaust temperature, affecting catalytic reaction, etc., to promote the pyrolysis and hydrolysis of urea, improve NOx Catalytic conversion efficiency, the effect of improving uniformity
Pending Publication Date: 2018-11-02
NORTH CHINA INST OF AEROSPACE ENG
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Problems solved by technology
However, the working conditions of the engine are changing. When the engine is working under low load, the exhaust gas temperature is low, and the reaction efficiency of urea hydrolysis and pyrolysis is low, so that the urea aqueous solution crystallizes on the inner wall of the exhaust pipe, forming a large amount of deposits, affecting Catalyzed reaction to reduce NO X Conversion efficiency
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[0008] The present invention will be described in further detail below according to the accompanying drawings.
[0009] As shown in the attached figure, a post-treatment heating and mixing device for diesel engines to prevent urea crystallization is composed of a heating cylinder and a mixer. The resistance heating cylinder and the mixer are integrated and located between the exhaust gas inlet pipe 1 and the catalytic converter 15. , including a urea nozzle 2, a control unit 7, a temperature sensor 8, a control switch 5, a power supply 4, a sliding rheostat 3, an external switch 6, a resistance wire 9, an insulating cylinder 10, an outer cylinder 11 of a heating and mixing device, and a resistance wire insulating support 12, Boss 13, arc blade 14. The temperature sensor 8 is connected to the control unit 7, the control switch 5, the power supply 4, the sliding rheostat 3, the external switch 6 and the resistance wire 9 are connected in series, and the resistance wire 9 is woun...
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The invention provides an anti-urea-crystallization diesel engine post-treatment heating mixing device. The device is arranged between a tail gas inlet pipeline (1) and a catalytic converter (15). Thedevice is characterized in that the device comprises a temperature sensor (8), a control unit (7), a control switch (5), a power supply (4), a slide rheostat (3), a resistance wire (9), external switch (6), an insulating cylinder (10), a heating mixing device outer cylinder (11), an insulating bracket (12), and a fan shaped blade type mixer (14), wherein the heating mixing device outer cylinder is provided with a protruded table (13), and the resistance heating cylinder and the mixer are integrated as a whole and located in the jet area of a urea jet nozzle (2). The exhaust back pressure of the device is small, the structure is simple and compact, and the installation is convenient so that the low-temperature adaptability of a diesel engine SCR post-treatment system can be effectively improved, ammonia gas and exhaust gas is intensively mixed and the NOX conversion efficiency is improved.
Description
Technical field: [0001] The invention relates to the technical field of exhaust aftertreatment systems of internal combustion engines, in particular to a diesel engine aftertreatment heating and mixing device for preventing urea crystallization. Background technique: [0002] In the face of increasingly stringent diesel engine emission regulations, especially the Euro V emission standard, the NOx emission limit has been greatly reduced. Urea Selective Catalytic Reduction (Urea-SCR) technology has high efficiency, high selectivity and high economy The advantages of high performance and sulfur resistance have become the main technical direction for domestic diesel engine emission upgrades. At present, in the diesel engine exhaust emission system with SCR system, a mixer is usually installed after the urea injection nozzle of the catalytic converter in the exhaust pipeline to improve the air flow disturbance, promote the uniformity of urea flow, and make the urea aqueous soluti...
Claims
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Login to View More IPC IPC(8): F01N3/20
CPCF01N3/2013F01N2900/1404Y02T10/12
Inventor 焦运景白亚双许文娟
Owner NORTH CHINA INST OF AEROSPACE ENG