Urea aqueous solution ultrasonic atomization device

Abstract

The utility model provides a urea aqueous solution ultrasonic atomization device. The urea aqueous solution ultrasonic atomization device comprises an exhaust pipe, an ultrasonic atomizer, an intelligent transmission rod and a urea nozzle, the exhaust pipe is connected with a front engine tail pipe; the ultrasonic nebulizer is connected with the intelligent transmission rod; the ultrasonic atomizer is connected with the urea nozzle through the intelligent conveying rod; the urea nozzle is connected to the tail end of the intelligent conveying rod; the SCR postprocessor is arranged at the rear end of the exhaust pipe; the first tail gas sensor is positioned in front of the urea nozzle; the second tail gas sensor is positioned behind the SCR postprocessor; by means of the ultrasonic atomization device, the NOX content of the upper portion and the NOX content of the lower portion of the exhaust pipe can be accurately adjusted and controlled, and the SCR aftertreatment system can achieve the high conversion rate.

Description

Technical Field

[0001] This utility model patent relates to an ultrasonic atomization device for urea aqueous solution, and the relevant field includes NO. X Emission control and after-treatment of internal combustion engine exhaust. Background Technology

[0002] NO X This is a key and challenging aspect of internal combustion engine emission pollution control. Currently, urea nozzle atomization SCR systems are complex in structure, costly, and some atomized droplet sizes are still relatively large, easily leading to urea crystallization and making it difficult to meet the stricter requirements of the China VI emission standards. Ultrasonic atomization technology, however, has the advantage of easier control over atomized droplet size, resulting in a smaller atomized droplet distribution. This utility model patent proposes applying intelligent ultrasonic atomization technology to SCR exhaust aftertreatment systems to explore NOx emissions from internal combustion engines. X New control technologies enable SCR systems to meet increasingly stringent emission regulations. Utility Model Content

[0003] The purpose of this invention is to provide an ultrasonic atomization device for urea aqueous solution to improve the NO content in internal combustion engine exhaust. X Absorption efficiency.

[0004] The technical solution of this utility model is to provide an ultrasonic atomizing device for urea aqueous solution, characterized in that the ultrasonic atomizing device for urea aqueous solution includes at least:

[0005] The exhaust pipe is connected to the engine tailpipe at the front, and the engine exhaust contains NO. X Ultrasonic atomizer, which is connected to the intelligent transmission rod;

[0006] The intelligent transmission rod connects the ultrasonic atomizer and the urea nozzle, and the height h of the intelligent transmission rod in the exhaust pipe can be adjusted.

[0007] A urea nozzle is connected to the end of an intelligent conveying rod, and the tilt angle of the urea nozzle can be adjusted.

[0008] The SCR aftertreatment system is located at the rear end of the exhaust pipe;

[0009] The first exhaust gas sensor is connected to the electronic control unit (ECU) and is located in front of the urea nozzle.

[0010] The second exhaust gas sensor is connected to the electronic control unit (ECU), located behind the SCR after-processor, and installed on the upper part of the exhaust pipe.

[0011] The third exhaust gas sensor is connected to the electronic control unit (ECU), located behind the SCR after-processor, and installed at the bottom of the exhaust pipe.

[0012] Furthermore, the ultrasonic atomizer atomizes the liquid urea into urea droplets, which then enter the intelligent conveyor rod and are sprayed into the exhaust pipe through the urea nozzle.

[0013] Furthermore, the two ends of the intelligent transmission rod are connected to the ultrasonic atomizer and the urea nozzle. The ultrasonic atomizer and the intelligent transmission rod are equipped with signal receivers. There is an annular connecting valve at the connection between the intelligent transmission rod and the urea nozzle. The annular connecting valve is rotated according to the control signal to change the spray angle of the urea nozzle.

[0014] Furthermore, the urea nozzle is located inside the exhaust pipe and is connected to the intelligent transmission rod via a ring-shaped connecting valve, which sprays out urea droplets from the intelligent transmission rod.

[0015] Furthermore, the intelligent transmission rod does not cross the center line of the exhaust pipe when it extends or retracts.

[0016] The advantages of this utility model over the prior art include:

[0017] (1) The ultrasonic atomizing device for urea aqueous solution of this utility model, wherein the electronic control unit (ECU) measures the NO content measured by the first exhaust gas sensor, the second exhaust gas sensor, and the third exhaust gas sensor. X The concentration signal value is used to accurately calculate and adjust the frequency f and power P of the ultrasonic atomizer, spraying out an appropriate amount of urea droplets, which can effectively eliminate NO in the exhaust gas. X This also avoids excessive waste.

[0018] (2) The ultrasonic atomizing device and control method for urea aqueous solution of this utility model are calculated by the electronic control unit (ECU). If the NO in the upper and lower parts of the exhaust pipe is... X If the urea content is different and the absolute value of the difference is greater than threshold A but less than threshold B, then only the injection angle of the urea nozzle needs to be adjusted. If the signal value of the second exhaust gas sensor is greater than the signal value of the third exhaust gas sensor, then the tilt angle is controlled. To direct the urea nozzle upwards, or conversely, to control the tilt angle. This causes the urea nozzle to spray downwards; through precise control of each unit and real-time signal feedback from sensors, the system can accurately regulate the NO emission levels in the upper and lower parts of the exhaust pipe. X The content enables the SCR post-processing system to achieve a high conversion rate.

[0019] (3) The ultrasonic atomizing device and control method for urea aqueous solution of this utility model, the electronic control unit (ECU) calculates, if the NO in the upper and lower parts of the exhaust pipe XThe absolute value of the content difference is greater than or equal to the threshold B, and the tilt angle is... The adjustment strategy is the same as above. The electronic control unit (ECU) sends a control signal to adjust the height h of the intelligent transmission rod inside the exhaust pipe. If the NO in the upper part of the exhaust pipe... X If the NO content is higher in the upper part of the exhaust pipe than in the lower part, then increase the h value. X If the NO content is lower than in the lower part, the h value is reduced. By controlling the extension and retraction of the intelligent transmission rod, the NO content in the upper and lower parts of the exhaust pipe can be regulated more quickly. X The content allows the SCR aftertreatment system to achieve a higher conversion rate in a shorter time. It is also necessary to ensure that the intelligent transmission rod does not cross the center line of the exhaust pipe during extension and retraction, to prevent excessive airflow from bending or breaking the intelligent transmission rod. Attached Figure Description

[0020] To make the content of this utility model clearer and easier to understand, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Figure 1 This is a schematic diagram of the ultrasonic atomization device for urea aqueous solution of this utility model.

[0022] Figure 2 This is a schematic diagram of an ultrasonic atomization device for urea aqueous solution based on a certain control strategy according to this utility model.

[0023] Explanation of reference numerals on the accompanying drawings:

[0024] 10-Exhaust pipe; 20-Ultrasonic atomizer; 30-Intelligent transmission rod; 40-Urea nozzle; 50-Electronic control unit (ECU); 60-SCR after-processor; 101-First exhaust gas sensor; 102-Second exhaust gas sensor; 103-Third exhaust gas sensor; 401-Urea droplets; 402-Annular connecting valve. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0026] In this utility model, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this utility model, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0027] In this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number. In the description of this invention, if relational terms such as "first" and "second" are used, they are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0028] In this utility model, unless otherwise explicitly defined, terms such as "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model based on the specific content of the technical solution.

[0029] In this embodiment, please refer to the following: Figure 1 The ultrasonic atomizing device and control method for urea aqueous solution includes an exhaust pipe 10, which is connected to the engine tailpipe in front. The engine exhaust gas contains NO. X The ultrasonic atomizer 20 is connected to the intelligent transmission rod 30, and its power P and frequency f can be adjusted; the intelligent transmission rod 30 connects the ultrasonic atomizer 20 and the urea nozzle 40, and the height h of the intelligent transmission rod in the exhaust pipe 10 is adjustable; the urea nozzle 40 is connected to the end of the intelligent transmission rod 30, and the tilt angle of the urea nozzle is adjustable. Adjustable; Electronic control unit ECU 50, which receives signals from the first exhaust gas sensor 101, the second exhaust gas sensor 102, and the third exhaust gas sensor 103, and calculates and sends control signals to adjust the power P and frequency f of the ultrasonic atomizer 20, the height h of the intelligent transmission rod 30 in the exhaust pipe 10, and the tilt angle of the urea nozzle 40. SCR aftertreatment unit 60, which is located at the rear end of exhaust pipe 10, so that NOX A chemical reaction is carried out with NH3; a first exhaust gas sensor 101 is connected to the electronic control unit ECU 50 and is located in front of the urea nozzle 40; a second exhaust gas sensor 102 is connected to the electronic control unit ECU 50 and is located behind the SCR after-processor 60 and installed on the upper part of the exhaust pipe 10; a third exhaust gas sensor 103 is connected to the electronic control unit ECU 50, is located behind the SCR after-processor 60 and installed on the lower part of the exhaust pipe 10.

[0030] In this embodiment, when the ultrasonic atomizing device for urea aqueous solution is applied to a vehicle, the front end of the exhaust pipe 10 is connected to the vehicle's engine tailpipe, containing NO. X Engine exhaust gas enters the exhaust pipe 10. The ultrasonic atomizer 20 atomizes liquid urea into urea droplets 401. The urea droplets 401 enter the intelligent delivery rod 30 and are sprayed into the exhaust pipe 10 through the urea nozzle 40. The urea droplets 401 evaporate upon heating, producing NH3 and NO. X A chemical reaction occurs in the SCR post-processor 60 to reduce NO. X Actual emissions. The electronic control unit (ECU50) determines NO emissions based on the SCR aftertreatment system (60) before and after the process. X NO content signal and NO in the upper and lower parts of exhaust pipe 10 after SCR aftertreatment 60 X The content signal is used to adjust the height h of the urea nozzle 40 in the exhaust pipe 10 and the injection angle of the urea nozzle 40. The content of the injected urea droplets 401 and the frequency f and power P of the ultrasonic atomizer 20.

[0031] Furthermore, the intelligent transmission rod 30 is connected at both ends to the ultrasonic atomizer 20 and the urea nozzle 40. Both the ultrasonic atomizer 20 and the intelligent transmission rod 30 are equipped with signal receivers. Based on control signals, the frequency f and power P of the ultrasonic atomizer 20, as well as the length of the intelligent transmission rod 30, are adjusted. An annular connecting valve 402 is located at the connection point between the intelligent transmission rod 30 and the urea nozzle 40. Rotating the annular connecting valve 402 according to control signals changes the spray angle of the urea nozzle 40. The urea nozzle 40 is located inside the exhaust pipe 10 and is connected to the intelligent transmission rod 30 via an annular connecting valve 402. It sprays out urea droplets 401 from the intelligent transmission rod 30. The nozzle's height h and injection angle within the exhaust pipe 10 are specified. The movement of the intelligent transmission rod 30 changes accordingly. The intelligent transmission rod 30 must not cross the center line of the exhaust pipe 10 during extension or retraction to avoid excessive airflow bending or breaking the intelligent transmission rod. XThe content signal value is obtained through the first exhaust gas sensor 101, the second exhaust gas sensor 102 and the third exhaust gas sensor 103 at both ends.

[0032] Furthermore, the electronic control unit (ECU) 50 collects real-time signals from the first exhaust gas sensor 101, the second exhaust gas sensor 102, and the third exhaust gas sensor 103. After centralized data processing, the control signal is transmitted to the signal receiver of the ultrasonic atomizer 20. Based on the control signal, the frequency f and power P of the ultrasonic atomizer 20 are adjusted to spray an appropriate amount of urea droplets 401. At the same time, the ultrasonic atomizer 20 transmits a signal to the signal receiver of the intelligent transmission rod 30, changing the length of the intelligent transmission rod 30 and the angle of rotation of the annular connecting valve 402, thereby changing the height h of the urea nozzle 40 on the central axis of the exhaust pipe 10 and the injection tilt angle. .

[0033] This embodiment proposes a method for controlling an ultrasonic atomizing device for urea aqueous solution, comprising the following steps:

[0034] (1) Obtain NO before and after the SCR post-processor device X Content signal value;

[0035] (2) Based on the signal values ​​collected by the sensor, the electronic control unit ECU50 uses a neural network related algorithm to calculate the appropriate urea solution supply amount, the appropriate frequency f and power P of the ultrasonic atomizer 20, the extension and retraction of the intelligent transmission rod 30, and the rotation angle of the urea nozzle 40. .

[0036] The specific control methods are:

[0037] The electronic control unit ECU 50 measures NO based on the first exhaust gas sensor 101, the second exhaust gas sensor 102, and the third exhaust gas sensor 103. X By adjusting the frequency f and power P of the ultrasonic atomizer 20, an appropriate amount of urea droplets 401 are sprayed out, which can effectively eliminate NO in the exhaust gas. X This also avoids excessive waste;

[0038] The second exhaust gas sensor 102 monitors NO at the upper part of the exhaust pipe 10. X The content of NO in the lower part of the exhaust pipe 10 is monitored by the third exhaust gas sensor 103. X The NO content is calculated by the electronic control unit ECU50. If the NO content in the upper and lower parts of the exhaust pipe 10 is... X If the absolute value of the content difference is less than threshold A, no adjustment should be made. The calculation is performed by the electronic control unit ECU50. If the NO content in the upper and lower parts of the exhaust pipe 10 is... XIf the content is different and the absolute value of the difference is greater than threshold A but less than threshold B, then only the injection tilt angle of the urea nozzle 40 needs to be adjusted. If the signal value of the second exhaust gas sensor 102 is greater than the signal value of the third exhaust gas sensor 103, then the tilt angle is controlled. To make the urea nozzle point upwards at 40 degrees, or conversely, to control the tilt angle. This causes the urea nozzle to spray downwards at 40°. Through precise control of each unit and real-time signal feedback from sensors, the system can accurately regulate the NO emission levels in the upper and lower parts of the exhaust pipe. X The content enables the SCR post-processing system to achieve a high conversion rate;

[0039] The electronic control unit ECU50 calculates whether the NO emissions from the upper and lower parts of the exhaust pipe 10 are... X The absolute value of the content difference is greater than or equal to the threshold B, and the tilt angle is... The adjustment strategy is the same as above. The electronic control unit ECU50 sends a control signal to adjust the height h of the intelligent transmission rod 30 inside the exhaust pipe 10. If the NO in the upper part of the exhaust pipe 10 is... X If the NO content is higher than in the lower part, then increase the h value. If the NO content in the upper part of exhaust pipe 10 is higher... X If the NO content is lower than in the lower part, the h value is reduced. By controlling the extension and retraction of the intelligent transmission rod, the NO content in the upper and lower parts of the exhaust pipe can be regulated more quickly. X The content allows the SCR aftertreatment system to achieve a higher conversion rate in a shorter time. It is also necessary to ensure that the intelligent transmission rod does not cross the center line of the exhaust pipe during extension and retraction, to prevent excessive airflow from bending or breaking the intelligent transmission rod.

[0040] Finally, it should be noted that the above descriptions are merely specific embodiments of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An ultrasonic atomizing device for urea aqueous solution, characterized in that, include: Exhaust pipe (10), which is connected to the engine tailpipe at the front, and the engine exhaust contains NO. X ; An ultrasonic atomizer (20) is connected to an intelligent transmission rod (30). The intelligent transmission rod (30) connects the ultrasonic atomizer (20) and the urea nozzle (40), and the height h of the intelligent transmission rod (30) in the exhaust pipe (10) can be adjusted. A urea nozzle (40) is connected to the end of the intelligent conveyor rod (30), and the inclination angle of the urea nozzle is... Capable of regulation; SCR aftertreatment (60), the SCR aftertreatment is located at the rear end of the exhaust pipe (10); The first exhaust gas sensor (101) is connected to the electronic control unit (ECU) (50) and is located in front of the urea nozzle (40). The second exhaust gas sensor (102) is connected to the electronic control unit (ECU) (50), located behind the SCR after-processor (60), and installed on the upper part of the exhaust pipe (10). The third exhaust gas sensor (103) is connected to the electronic control unit (ECU) (50), located behind the SCR after-processor (60), and installed at the bottom of the exhaust pipe (10).

2. The ultrasonic atomizing device for urea aqueous solution according to claim 1, characterized in that, The ultrasonic atomizer (20) atomizes liquid urea into urea droplets (401), which enter the intelligent conveyor rod (30) and are sprayed into the exhaust pipe (10) through the urea nozzle (40).

3. The ultrasonic atomizing device for urea aqueous solution according to claim 1, characterized in that, The intelligent transmission rod (30) is connected to the ultrasonic atomizer (20) and the urea nozzle (40) at both ends. The ultrasonic atomizer (20) and the intelligent transmission rod (30) are equipped with signal receivers. There is an annular connecting valve (402) at the connection between the intelligent transmission rod (30) and the urea nozzle (40). The annular connecting valve (402) is rotated according to the control signal to change the spray angle of the urea nozzle (40). .

4. The ultrasonic atomizing device for urea aqueous solution according to claim 1, characterized in that, The urea nozzle (40) is located inside the exhaust pipe (10) and is connected to the intelligent transmission rod (30) through an annular connecting valve (402) to spray out the urea droplets (401) inside the intelligent transmission rod (30).

5. The ultrasonic atomizing device for urea aqueous solution according to claim 1, characterized in that, When the intelligent transmission rod (30) extends or retracts, it does not cross the center line of the exhaust pipe (10).

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