An electrically energized renewable tail gas treatment device and its parking regeneration method

Abstract

An electrically energized renewable exhaust gas treatment device and a method for parking regeneration using the device. With the metal foam inner cylinder in the exhaust gas treatment device as the main component, supplemented by an electric heating component, it has fast heat conduction and avoids ablation caused by a sharp temperature rise. It can achieve a space utilization rate of 50%, ensure a soot particle capture efficiency of over 85%, and can use a volume of about 1.5L, which is about 10 times higher than that of ordinary DPF, preventing the situation of soot particle blockage. At the same time, the operation of the control electric heating wire is controlled by an electric control mechanism, and the electric control system is equipped with a digital display thermometer and a thermocouple, which can accurately control the temperature of the heating system, perform differential temperature rise and treatment, and the regeneration method is more flexible.

Description

Technical Field

[0001] The present invention relates to the technical field of diesel engine exhaust gas treatment equipment for off-road mobile machinery, and particularly relates to an electrically renewable exhaust gas treatment device and a method for parking regeneration using the device. Background Art

[0002] The DPF purification technology is a relatively mature diesel engine exhaust gas treatment technology in the prior art. The DPF is a diesel particulate filter. After installation, it is equivalent to putting an "N95" mask on a diesel vehicle. A traditional DPF can collect about 80% of the particulate matter.

[0003] The diesel particulate filter generally needs to be used for about 3 to 7 days. The accumulated soot will cause blockage, and the DPF needs to be removed for regeneration. Generally, it takes 2 to 3 days for a repair shop to handle it, and the cost is relatively high. To solve this problem, a Chinese patent application with the application number CN201210534472.6 and the application name of a diesel engine exhaust aftertreatment temperature raising device and a temperature raising method discloses a diesel engine exhaust aftertreatment temperature raising device and a temperature raising method that can not only increase the exhaust gas temperature of a diesel vehicle without an ignition system but also regenerate a diesel engine exhaust aftertreatment device in an ultra-low temperature state below zero degrees. The heating rod is in a columnar structure and is divided into a wiring end part, a heat conduction part, and a high-temperature ignition head. The heat conduction part is located in the diesel gasification cavity and is hermetically fitted with the end covers at both ends of the diesel gasification cavity. The wiring end part and the high-temperature ignition head are located outside the end covers of the diesel gasification cavity. The heat storage body is sleeved on the heat conduction part of the heating rod and is located in the diesel gasification cavity. A ignition tube cavity is covered on the high-temperature ignition head. The heat storage body is sleeved on the heat conduction part of the heating rod and is located in the diesel gasification cavity. One end of the combustion cavity is connected to the diesel gasification cavity and covers the ignition tube cavity. The fuel injection pipe part in the fuel delivery pipe passes through the end cover of the diesel gasification cavity and is located in the diesel gasification cavity. The heating part in the fuel delivery pipe is located in the combustion cavity.

[0004] To avoid blockage through regeneration, in order to ensure that the particulate matter captured by the DPF can be completely cleaned, the oxidation-reduction temperature of the particulate matter needs to be reduced from 600 - 650 degrees to about 450 degrees. This requires continuous addition of special additives to achieve. Besides significantly increasing the use cost and making the system more complex, the additives themselves have potential hazards to safety, health, and the environment. At the same time, the active regeneration system in the prior art is designed more complexly, the system working state is unstable, and when the DPF is regenerated, the temperature rises sharply. When the temperature is higher than 1350 °C, the DPF will soften and show ablation phenomena. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides an electrically renewable exhaust gas treatment device with a simple structure, fast heat conduction, high temperature resistance, and a large utilization space, and a method for regenerating the device when parking.

[0006] To solve the above technical problems, the present invention is solved by the following technical solutions: An electrically energized and renewable tail gas treatment device, including a housing, an air inlet passage and an air outlet passage are provided on the housing and are communicated with the internal cavity of the housing. The internal cavity of the housing is divided into an air inlet part and an exhaust part by the tail gas treatment device. The tail gas treatment device includes an air inlet cavity and a treatment cavity formed by the cooperation of an outer cylinder and a metal foam inner cylinder. The air inlet cavity is communicated with the air inlet part, and the treatment cavity is communicated with the exhaust part. An electric heating component electrically connected to an external power source is provided on the outer side wall of the outer cylinder.

[0007] In the above technical solution, air inlet baffles and air outlet baffles are provided at both ends of the outer cylinder and the metal foam inner cylinder. The air inlet cavity is communicated with the air inlet part through air inlet holes provided on the air inlet baffle, and the treatment cavity is communicated with the exhaust part through air outlet holes provided on the air outlet baffle.

[0008] In the above technical solution, the outer edge of the air inlet baffle is in sealing cooperation with the inner cavity wall of the housing, so that the internal cavity of the housing is divided into the air inlet part and the exhaust part, forming two independent chambers, and maximizing the utilization of space.

[0009] In the above technical solution, the size of the air inlet holes on the air inlet baffle matches the size of the opening of the metal foam inner cylinder.

[0010] In the above technical solution, the size of the air outlet baffle matches the size of the outer cylinder, and the air outlet baffle is embedded at the opening of the end of the outer cylinder.

[0011] In the above technical solution, the air outlet holes are opened corresponding to the setting position of the treatment cavity, so that the treatment cavity is communicated with the exhaust part.

[0012] In the above technical solution, one or more air outlet holes are provided, which is beneficial to air outlet.

[0013] In the above technical solution, the outer cylinder and the metal foam inner cylinder are coaxially sleeved, so that the space between the inner cavity wall of the outer cylinder and the outer cavity wall of the metal foam inner cylinder forms a treatment cavity, and the internal cavity of the metal foam inner cylinder forms an air inlet cavity.

[0014] In the above technical solution, the electric heating component includes an electric heating wire, the electric heating wire is wound on the outer side of the outer cylinder, and its two ends extend from inside the housing to outside the housing and are electrically connected to an electric control mechanism.

[0015] In the above technical solution, the electric control mechanism is electrically connected to a power source.

[0016] A parking regeneration method for an energized renewable tail gas treatment device, comprising the following steps:

[0017] Step 1: Obtain the pressure values at the positions of the intake channel and the outlet channel of the tail gas treatment device in real time through sensors, so as to obtain the back pressure value;

[0018] Step 2: Calculate the carbon loading Y based on the back pressure. The relationship between the carbon loading Y and the back pressure X is as follows: Y = 0.02X 2 + 0.9X + 0.35;

[0019] Step 3: Transmit the obtained carbon loading data to the electronic control mechanism. When the carbon loading reaches the preset value for parking regeneration, the electronic control mechanism controls the parking regeneration time and the heating temperature to complete the regeneration.

[0020] In the above technical solution, the regeneration rate in Step 3 is greater than 90%.

[0021] Compared with the prior art, the present invention has the following beneficial effects: With the metal foam inner cylinder in the tail gas treatment device as the main body, supplemented by an electric heating component, the melting point of the metal foam is 1455°C and the heat conduction is fast, avoiding the ablation phenomenon caused by a sharp rise in temperature; The reasonable layout structure can make the space utilization rate reach 50%. The porosity of the metal foam inner cylinder is greater than that of the traditional DPF coating layer, which can ensure that the soot particle capture efficiency is above 85%, and the available volume is about 1.5L, which is about 10 times higher than that of ordinary DPF, preventing the situation of soot particle blockage; At the same time, the electronic control mechanism controls the operation of the electric heating wire, and the electronic control system is equipped with a digital display thermometer and a thermocouple, which can accurately control the temperature of the heating system, perform differential heating, and the regeneration method is more flexible, ensuring that the regeneration rate reaches more than 90%. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] Figure 1 It is a schematic structural diagram of the present invention.

[0024] Figure 2 It is an exploded structural diagram of the present invention.

[0025] Figure 3 It is an axonometric sectional view of the present invention.

[0026] Figure 4 It is an exploded structural diagram of the tail gas treatment device.

[0027] Figure 5 This is a schematic diagram of the connection structure of the present invention.

[0028] Figure 6 This is a curve graph showing the relationship between back pressure and carbon loading. Detailed implementation manners

[0029] The present invention will be further described in detail below with reference to the accompanying drawings.

[0030] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and other obvious variations can be conceived by those skilled in the art. The basic principles defined in the following description can be used in other implementation manners, variations, improvements, equivalent manners, and other technical solutions without departing from the spirit and scope of the present invention.

[0031] Those skilled in the art should understand that in the disclosure of the present invention, the orientation or position indicated by terms such as "longitudinal", "transverse", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or position relationship shown in the drawings. It is only for the convenience of simplifying the description of the present invention, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on the present invention.

[0032] It can be understood that the term "one" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in other embodiments, the number of the element can be multiple. The term "one" should not be construed as a limitation on the number.

[0033] See Figures 1 to 5, A power-on renewable tail gas treatment device, including a housing 1. The two ends of the housing are of a closed structure, and the inner cavity forms a closed structure. Obviously, the form of this housing 1 is not limited to a cylinder, and can also be square or other shapes, depending on the installation environment. Guided by maximizing space utilization, a housing 1 with a shape that conforms to the actual situation is customized. The tail gas treatment device 2 is arranged inside the housing 1. By opening an air inlet channel 11 and an air outlet channel 12 on the housing 1, the collected tail gas enters the housing 1 through the air inlet channel 11. After passing through the tail gas treatment device 2, it is discharged through the air outlet channel 12, thus realizing the function of tail gas treatment. Of course, the arrangement positions of the air inlet channel 11 and the air outlet channel 12 can be diverse, not limited to the arrangement shown in the figure. It can be that the air inlet channel 11 and the air outlet channel 12 are on the same horizontal line at the same time, or the air inlet channel 11 and the air outlet channel 12 are on two mutually perpendicular planes, or the air inlet channel 11 and the air outlet channel 12 are on the same vertical line. The installation compatibility is large and it can be widely used in various occasions.

[0034] Obviously, the tail gas entering the housing 1 contains a large amount of soot particles. After passing through the tail gas treatment device 2, the gradual accumulation will cause the blockage of the tail gas treatment device, which will instead affect the performance of the vehicle or construction machinery. Therefore, the assembly relationship between the tail gas treatment device 2 and the housing 1 is particularly important, and it can be renewable, that is, through the tail gas treatment device 2 itself, it can clean the soot particles attached to the tail gas treatment device 2 and restore the treatment performance of the tail gas treatment device 2 itself. The specific structure is as follows:

[0035] The tail gas treatment device 2 is arranged inside the housing 1 and divides the internal cavity of the housing 1 into an air inlet part 13 and an exhaust part 14. Obviously, the cavity corresponding to the air inlet channel 11 side is the air inlet part 13, and the cavity corresponding to the air outlet channel 12 side is the exhaust part 14.

[0036] The tail gas treatment device 2 includes an outer cylinder 21, a metal foam inner cylinder 22, an intake baffle 25, an exhaust baffle 26, and an electric heating component 20. Among them, both the outer cylinder 21 and the metal foam inner cylinder 22 are structures with open ends, and the set size of the outer cylinder 21 is larger than that of the metal foam inner cylinder 22. When the outer cylinder 21 and the metal foam inner cylinder 22 adopt a cylindrical structure, the cylinder diameter of the outer cylinder 21 is larger than that of the metal foam inner cylinder 22. The outer cylinder 21 and the metal foam inner cylinder 22 are sleeved together and arranged coaxially. In this way, a certain capacity space is formed between the inner cavity wall of the outer cylinder 21 and the outer cavity wall of the metal foam inner cylinder 22. At this time, the intake baffle 25 is arranged on the end faces of the outer cylinder 21 and the metal foam inner cylinder at one end of the intake part 13, so that the intake baffle 25 closes one end of the capacity space formed between the inner cavity wall of the outer cylinder 21 and the outer cavity wall of the metal foam inner cylinder 22, and the outer edge of the intake baffle 25 abuts against the inner cavity wall of the housing 1 and is in sealing fit, so that the internal cavity of the housing 1 is divided into an intake part 13 and an exhaust part 14. Of course, an intake hole 251 is opened in the middle of the intake baffle 25, and the aperture size of the intake hole 251 matches the cylinder diameter size of the metal foam inner cylinder 22. Of course, the intake hole 251 here is not limited to a circular shape and can adopt a shape suitable for the actual use environment. The tail gas enters the intake part 13 through the intake channel 11, and then enters the treatment cavity 24 after passing through the metal foam inner cylinder 22 through the intake hole 251.

[0037] The exhaust baffle 26 is arranged on the other end face of the outer cylinder 21 and the metal foam inner cylinder at one end of the intake part 13, so that the intake baffle 25 closes the other end of the capacity space formed between the inner cavity wall of the outer cylinder 21 and the outer cavity wall of the metal foam inner cylinder 22, so as to realize that the capacity space becomes a closed area. And the outer diameter of the exhaust baffle 26 is the same as the inner diameter of the outer cylinder 21, that is, the exhaust baffle 26 can just be stably clamped at the port of the outer cylinder 21. An exhaust hole 261 is opened on the exhaust baffle 26 corresponding to the position of the treatment cavity 24, which can make the tail gas entering the treatment cavity 24 be discharged to the exhaust part 14 through the exhaust hole 261, and ensure that it will not directly reach the exhaust part 14 from the metal foam inner cylinder 22. The number of the exhaust holes 261 can be set to one or more according to the exhaust gas volume.

[0038] Obviously, in order to make the assembly of the metal foam inner cylinder 22 with the intake baffle 25 and the exhaust baffle 26 more stable, fitting installation parts 221 are arranged at both ends of the metal foam inner cylinder 22 for stable cooperation with the intake baffle 25 and the exhaust baffle 26.

[0039] The electric heating component 20 includes an electric heating wire which is wound around the outer periphery of the outer cylinder 21, and its two ends extend from inside the housing 1 to outside the housing 1 and are electrically connected to the electric control mechanism 5. The electric control mechanism 5 is equipped with a digital display thermometer and a thermocouple, which can accurately control the temperature of the electric heating component 20, perform differential heating, and the regeneration method is more flexible. Of course, the electric control mechanism 5 is electrically connected to the power supply 3.

[0040] Of course, the outer cylinder 21 and the metal foam inner cylinder 22 can also adopt other shaped structures and can also achieve the same effect.

[0041] When the tail gas treatment device 2 needs to be regenerated, only need to connect the electric heating component 20 to the electric control mechanism 5 and plug in the 220V power supply. There is a temperature control meter on the electric control mechanism 5. Press the switch to start the regeneration, and it will automatically heat up and regenerate.

[0042] The parking regeneration method of the tail gas treatment device includes the following steps:

[0043] Step 1: Obtain the pressure values at the positions of the intake passage and the outlet passage of the tail gas treatment device in real time through the sensor, and obtain the back pressure value through the pressure difference between the two.

[0044] Step 2: Calculate the carbon loading Y based on the back pressure. The relationship between the carbon loading Y and the back pressure X is as follows: Y = 0.02X 2 + 0.9X + 0.35.

[0045] Figure 6 is the relationship curve between the back pressure and the carbon loading.

[0046] Step 3: Transmit the obtained carbon loading data to the electric control mechanism. When the carbon loading reaches the preset value for parking regeneration, the electric control mechanism controls the parking regeneration time and the heating temperature, completes the regeneration, and ensures that the regeneration rate is greater than 90%.

[0047] Carbon loading / g Back pressure / KPa Temperature / °C Time / min Regeneration rate 1 0.8 500 15 95.30% 1.5 1.3 500 15 92.70% 2 2 500 15 91.20% 2.5 2.5 510 20 95.30% 3 3 510 20 93.50% 3.5 3.7 510 20 90.20% 4 4.5 520 25 94.10% 4.5 5.3 520 25 92.10% 5 6.2 530 25 90.20% 6 7.8 530 30 94.40% 7 9.6 540 30 92.40% 8 12 550 30 90.50%

[0048] It can be seen from the experimental data in the above table that a high regeneration rate can be obtained through the corresponding relationship between the carbon loading, the back pressure value, the temperature, and the time.

[0049] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the drawings are only examples and do not limit the present invention. The object of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and described in the embodiments. Without departing from the said principles, the embodiments of the present invention can have any deformation or modification.

Claims

1. An electrically energized and renewable tail gas treatment device, comprising a housing (1), an intake passage (11) and an exhaust passage (12) are provided on the housing (1) and communicate with the internal cavity of the housing, Characterized in that, The internal cavity of the housing (1) is divided into an intake part (13) and an exhaust part (14) by the tail gas treatment device (2). The tail gas treatment device (2) includes an intake cavity (23) and a treatment cavity (24) formed by the cooperation of an outer cylinder (21) and a metal foam inner cylinder (22). The intake cavity (23) communicates with the intake part (13), and the treatment cavity (24) communicates with the exhaust part (14). An electric heating component (20) electrically connected to an external power supply (3) is provided on the outer side wall of the outer cylinder (21); intake baffles (25) and exhaust baffles (26) are provided at both ends of the outer cylinder (21) and the metal foam inner cylinder (22). The intake cavity (23) communicates with the intake part (13) through intake holes (251) provided on the intake baffle (25). The treatment cavity (24) communicates with the exhaust part (14) through exhaust holes (261) provided on the exhaust baffle (26); the outer edge of the intake baffle (25) is hermetically fitted with the inner cavity wall of the housing (1), so that the internal cavity of the housing (1) is divided into the intake part (13) and the exhaust part (14). The size of the intake holes (251) on the intake baffle (25) matches the size of the opening of the metal foam inner cylinder (22); the outer diameter of the exhaust baffle (26) is the same as the inner diameter of the outer cylinder (21), and the exhaust baffle (26) is embedded at the opening of the end of the outer cylinder (21); the exhaust holes (261) are provided on the exhaust baffle (26) corresponding to the treatment cavity (24), so that the treatment cavity (24) communicates with the exhaust part (14); the electric heating component (20) includes an electric heating wire, and the electric heating wire is wound on the outer side of the outer cylinder (21), and its two ends extend from inside the housing (1) to outside the housing (1) and are electrically connected to an electric control mechanism (5), and the electric control mechanism (5) is electrically connected to the power supply (3).

2. An electrically energized and renewable tail gas treatment device according to claim 1, Characterized in that, One or more exhaust holes (261) are provided.

3. An electrically energized and renewable tail gas treatment device according to claim 1, Characterized in that, The outer cylinder (21) and the metal foam inner cylinder (22) are coaxially sleeved, so that the space between the inner cavity wall of the outer cylinder and the outer cavity wall of the metal foam inner cylinder (22) forms a treatment cavity (24), and the internal cavity of the metal foam inner cylinder (22) forms an intake cavity (23).

4. A parking regeneration method for an electrically energized and renewable tail gas treatment device according to any one of claims 1-3, Characterized in that, Comprising the following steps: Step 1: Real-time obtain the pressure values at the positions of the intake passage and the exhaust passage of the tail gas treatment device through sensors, so as to obtain the back pressure value; Step 2: Calculate the carbon loading Y based on the back pressure. The relationship between the carbon loading Y and the back pressure X is as follows: Y = 0.02X² + 0.9X + 0.35; Step 3: Transmit the obtained carbon loading data to the electronic control mechanism. When the carbon loading reaches the preset value for parking regeneration, the electronic control mechanism controls the parking regeneration time and the heating temperature to complete the regeneration.

5. The parking regeneration method of an electrically regenerable exhaust gas treatment device according to claim 4, characterized in that the regeneration rate in step 3 is greater than 90%.

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