Device and method for adding diesel urea solution
A technology for adding devices and diesel engines, applied in the direction of mufflers, exhaust devices, mechanical equipment, etc., can solve the problems of complex structure of urea supply system, power consumption of diesel engines, high cost, etc., to improve reliability and economy, atomization Good effect and low cost
Inactive Publication Date: 2012-12-26
MILITARY TRANSPORTATION UNIV PLA
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Problems solved by technology
[0006] (2) The structure of the urea supply system is complex, the cost is high, and it needs to consume part of the power of the diesel engine
[0008] (4) In order to achieve a stable injection pressure of the urea solution, a pressure regulator is required. The use of the pressure regulator increases the structural complexity. In addition, the return pipe and the heating device related to the return pipe and the pressure regulator need to be added.
Method used
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Embodiment 1
[0057] control Figure 1-5 , the urea solution flow control device and atomizer are taken according to image 3 integrated design scheme.
[0058] On a heavy-duty high-pressure common rail supercharged diesel engine with a displacement of 9.73L and a rated power of 276kW, the standard test condition test stipulated by the national emission regulations was carried out. The volume of the SCR catalytic converter is 20L, and the nitrogen oxide emission test of the original diesel engine As a result, ESC, the European steady-state test cycle or thirteen working conditions method, is 8.59g / kW.h; ETC, the European transient test cycle, is 9.67g / kW.h;
[0059] After using the urea solution adding device to inject urea solution into the exhaust, the diesel engine nitrogen oxide emission test results ESC is 1.81g / kW.h; ETC is 1.66g / kW.h; ammonia leakage peak value is less than 8ppm.
[0060] Figure 5 It is the nitrogen oxide emission curve of the original engine and urea solution in...
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The invention relates to a device and a method for adding diesel urea solution and belongs to the technical field of engine exhaust-gas disposal. The device comprises a urea box, N pressure chambers connected with the urea box, a switch valve for realizing control, air inlet / outlet pipes positioned at the top of the pressure chambers, three-way valves positioned at the top of the air inlet / outletpipes, urea solution outlet pipes positioned at the bottom of the pressure chambers, control units connected with the three-way valves, the switch valves, and urea solution flow rate controllers, wherein the other ends of the outlet pipes are connected in series with the urea solution flow rate controllers and urea solution nozzles in turn. The invention provides a pumpless urea solution adding device, a system and a method, which have the advantages of low energy consumption, simple structure, low cost of devices, reliable operation and excellent atomization effect.
Description
technical field [0001] The invention belongs to an accessory device for engine exhaust treatment, and further relates to a device and method for adding urea solution to a diesel engine. Background technique [0002] Diesel engines have been widely used in various industries all over the world due to their high thermal efficiency and low exhaust emissions, but their high nitrogen oxide emissions have always been a problem that plagues people. Selective Catalytic Reduction (SCR) is an effective method to control nitrogen oxides in diesel engines. Achieving precision, fast response, low-cost urea solution supply device with high reliability, consistency and atomization effect is a key factor affecting the popularization of diesel engine SCR. [0003] Currently commonly used urea solution supply devices are divided into two types, one is compressed air assisted injection form, and the other is non-compressed air assisted form. The compressed air-assisted form is to use compres...
Claims
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IPC IPC(8): F01N3/20F01N3/32
CPCY02T10/20Y02T10/12
Inventor 资新运邓成林张春润姚广涛徐正飞庞海龙姜大海刘宏威卜建国
Owner MILITARY TRANSPORTATION UNIV PLA