DPF combustor

Abstract

The utility model provides a DPF burner, and belongs to the field of diesel engine tail gas treatment. A gas inlet and a gas outlet are formed in the two sides of the burner shell respectively; the first combustion chamber is arranged on the inner side of the combustor shell, and a first rotational flow plate is fixed to one end. One end of the material spraying pipe penetrates through the first rotational flow plate and communicates with the first combustion chamber, and the other end of the material spraying pipe extends outwards and penetrates out of the combustor shell; the igniter sequentially penetrates through the combustor shell and the first combustion chamber; the second combustion chamber is arranged in the first combustion chamber in a sleeving mode and fixedly connected with the first combustion chamber through a second rotational flow plate, and the length of the second combustion chamber is at least 1.5 times that of the first combustion chamber. According to the DPF combustor, due to the rotational flow effect of the first rotational flow plate, the second rotational flow plate and the third rotational flow plate, the turbulent flow effect of the first combustion chamber, the second combustion chamber and the third rotational flow plate is remarkable, fuel and exhaust tail gas are fully mixed, and the combustion efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of tail gas treatment, in particular to a DPF burner. Background Art

[0002] Particulate matter is a major pollutant in diesel engine exhaust emissions. Particulate matter treatment technologies primarily reduce exhaust particulate matter through capture. Particulate filtration is currently recognized as the most effective technology for reducing diesel engine particulate matter emissions. Diesel particulate filters (DPFs) can eliminate 95% of diesel engine particulate matter (black smoke) emissions, reducing PM levels in the air.

[0003] Because the particulate filter continuously collects particles from the internal combustion engine's exhaust, exhaust backpressure inevitably increases, necessitating regular removal of particles from the DPF. DPFs operate with two particle removal functions: passive regeneration and active regeneration. Active regeneration involves adding a burner before the DPF. The burner includes an air supply system, a fuel supply system, a nozzle, an oil-air mixer, and an ignition plug. The atomized oil-air mixture is ignited by the ignition plug in the combustion chamber, causing the exhaust to reach approximately 620°C, igniting the particles in the DPF and achieving active regeneration.

[0004] At present, the existing patent 202020938723.7 discloses an insertable multi-stage mixing DPF burner, including a burner outer tube and a multi-stage combustion chamber. The multi-stage combustion chamber includes an inner combustion chamber and an after-combustion chamber installed in the burner outer tube in sequence according to the exhaust flow direction. The inner combustion chamber is provided with a first end cover, and the first end cover is provided with a nozzle. The wall of the burner outer tube is provided with a spray pipe and an igniter extending from the outside into the inside. The spray pipe is connected to the nozzle and sprays fuel into the inner combustion chamber. The ignition head of the igniter extends into the inner combustion chamber, and the tail end of the after-combustion chamber is provided with a fire-retardant net.

[0005] In the above technology, the exhaust inlet channels of combustion chambers 2 and 3 are narrow, the amount of diesel engine exhaust entering is small, the utilization efficiency of combustion chambers 2 and 3 is limited, and at the same time, the turbulence effect of combustion chambers 2 and 3 is not significant, the mixing effect between fuel and exhaust is limited, and the combustion efficiency is low. Utility Model Content

[0006] In view of the above problems, the present utility model provides a DPF burner.

[0007] A DPF burner comprises: a burner shell with an air inlet and an air outlet on both sides; a first combustion chamber arranged on the inner side of the burner shell and having a first swirl plate fixed at one end; a spray pipe with one end passing through the first swirl plate and communicating with the first combustion chamber, and the other end extending outward and passing through the burner shell; an igniter passing through the burner shell and the first combustion chamber in sequence; a second combustion chamber sleeved in the first combustion chamber and fixedly connected to the first combustion chamber via the second swirl plate, and the length of the second combustion chamber is at least 1.5 times the length of the first combustion chamber.

[0008] A first air intake passage is formed between the second combustion chamber and the first combustion chamber, and a diameter of a middle portion of the first air intake passage is smaller than a diameter of both ends of the first air intake passage, wherein the air intake side of the first air intake passage is arranged in a trumpet-shaped opening.

[0009] In a preferred embodiment, the DPF burner further includes: a third combustion chamber, which is sleeved outside the second combustion chamber and fixedly connected to the second combustion chamber through a third swirl plate, and the length of the third combustion chamber is at least 1.5 times the length of the second combustion chamber.

[0010] In a preferred embodiment, a second air intake passage is formed between the third combustion chamber and the second combustion chamber, and a diameter of a middle portion of the second air intake passage is smaller than a diameter at both ends of the second air intake passage.

[0011] In a preferred embodiment, trumpet-shaped openings are provided on both sides of the third combustion chamber, and the diameter away from the second combustion chamber is larger than the diameter close to the second combustion chamber, and air vents are evenly provided on the shell wall of the third combustion chamber away from the second combustion chamber.

[0012] In a preferred embodiment, the DPF burner further comprises: an exhaust gas diffusion plate, which is arranged in an arc shape and protrudes toward the first combustion chamber, fixed to the inner side of the burner housing and fixed on the side away from the first combustion chamber.

[0013] In a preferred embodiment, the DPF burner further comprises: connecting flanges integrally provided on both sides of the burner housing.

[0014] In the DPF burner of the present application, gas and liquid are atomized and sprayed into the first combustion chamber through the spray pipe, and the oil mist contacts the igniter to ignite and burn. A part of the exhaust gas enters the first combustion chamber through the first swirl plate, thereby generating a rotating airflow, and the flame is evenly mixed and burned. Similarly, another part of the exhaust gas enters the second combustion chamber through the second swirl plate, contacts the flame from the first combustion chamber, and is evenly mixed and burned. Due to the swirl effect of the first swirl plate and the second swirl plate, the turbulence effect of the first combustion chamber and the second combustion chamber is significant, the fuel and exhaust gas are fully mixed, and the combustion efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Other characteristics, features and advantages of the present invention will become clear by reading the following description of exemplary embodiments with reference to the accompanying drawings. The accompanying drawings, which are incorporated into and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, are used to explain the principles of the present invention. In these drawings, similar reference numerals are used to represent similar elements. The drawings described below are some embodiments of the present invention, not all embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without inventive effort.

[0016] Figure 1 The structure diagram of the DPF burner of this utility model;

[0017] Figure 2 Cross-sectional view of the DPF burner at position AA of the present utility model.

[0018] In the figure: 10, burner housing; 11, air inlet; 12, air outlet; 20, first combustion chamber; 21, first swirl plate; 30, spray pipe; 31, igniter; 40, second combustion chamber; 41, second swirl plate; 42, first air inlet channel; 50, third combustion chamber; 51, third swirl plate; 52, second air inlet channel; 53, air vent; 60, exhaust diffuser; 13, connecting flange. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be arbitrarily combined with each other.

[0020] The DPF burner is described in detail below with reference to the accompanying drawings and embodiments. Example

[0021] A DPF burner includes: a burner housing 10 with an air inlet 11 and an air outlet 12 on either side; a first combustion chamber 20 disposed inside the burner housing 10 and having a first swirl plate 21 fixed to one end; a spray pipe 30 with one end passing through the first swirl plate 21 and communicating with the first combustion chamber 20 and the other end extending outward and passing through the burner housing 10; and an igniter 31 passing through the burner housing 10 and the first combustion chamber 20 in sequence.

[0022] The second combustion chamber 40 is sleeved on the first combustion chamber 20 and fixedly connected to the first combustion chamber 20 via a second swirl plate 41 . The length of the second combustion chamber 40 is at least 1.5 times that of the first combustion chamber 20 .

[0023] The DPF burner further includes: a connecting flange 13 , which is integrally provided on both sides of the burner housing 10 .

[0024] The length of the second combustion chamber 40 is at least 1.5-2 times the length of the first combustion chamber 20 .

[0025] During operation, a connecting flange 13 is provided on the air inlet 11 of the DPF burner, which is fixed to the engine exhaust pipe through the connecting flange 13. The gas and liquid are atomized and sprayed into the first combustion chamber 20 by the spray pipe 30, and the oil mist contacts the igniter 31 to ignite and burn. A part of the exhaust gas enters the first combustion chamber 20 through the first swirl plate 21, thereby generating a rotating airflow, and the flame is evenly mixed and burned. Similarly, another part of the exhaust gas enters the second combustion chamber 40 through the second swirl plate 41, contacts the flame from the first combustion chamber 20, and then is evenly mixed and burned. Due to the swirl effect of the first swirl plate 21 and the second swirl plate 41, the turbulence effect of the first combustion chamber 20 and the second combustion chamber 40 is significant, the fuel and exhaust gas are fully mixed, and the combustion efficiency is high.

[0026] The large triangular openings of the first swirl plate 21 and the second swirl plate 41 can absorb the exhaust gas from the exhaust pipe to a greater extent, so that the exhaust gas from the exhaust pipe and the flame are fully burned. Example

[0027] Example 2 is an improvement on Example 1, and the improvement includes: a first air intake channel 42 is formed between the second combustion chamber 40 and the first combustion chamber 20, and the middle diameter of the first air intake channel 42 is smaller than the two end diameters of the first air intake channel 42, wherein the air intake side of the first air intake channel 42 is arranged in a trumpet-shaped opening.

[0028] Among them, the air intake side of the first air intake channel 42 is set to have a trumpet-shaped opening, and the middle diameter of the first air intake channel 42 is smaller than the diameters of the two ends of the first air intake channel 42 (Venturi tube structure), which can attract the exhaust pipe tail gas into the first air intake channel 42 to a greater extent, so that the flame and the exhaust tail gas are fully burned, thereby improving the combustion efficiency of the DPF burner. Example

[0029] Example 3 is an improvement on Example 1, and the improvement includes: the DPF burner also includes: a third combustion chamber 50, which is arranged on the outside of the second combustion chamber 40 and is fixedly connected to the second combustion chamber 40 through a third swirl plate 51, and the length of the third combustion chamber 50 is at least 1.5 times the length of the second combustion chamber 40.

[0030] Among them, by providing the third combustion chamber 50 and the third swirl plate 51 capable of generating a swirling flow, the exhaust gas can be further swirled and disturbed, the fuel and the exhaust gas are fully mixed, and the combustion efficiency of the DPF burner is improved.

[0031] The length of the third combustion chamber 50 is at least 1.5-2 times the length of the second combustion chamber 40 . Example

[0032] Example 4 is an improvement on Example 1, and the improvement includes: forming a second air intake passage 52 between the third combustion chamber 50 and the second combustion chamber 40 , and the middle diameter of the second air intake passage 52 is smaller than the diameters at both ends of the second air intake passage 52 .

[0033] Among them, the middle diameter of the second air intake channel 52 is smaller than the two end diameters of the second air intake channel 52 (Venturi tube structure), which can attract the exhaust pipe tail gas into the second air intake channel 52 to a greater extent, so that the flame and the exhaust tail gas are fully burned, thereby improving the combustion efficiency of the DPF burner. Example

[0034] Example 5 is an improvement on Example 1, and the improvements include: trumpet-shaped openings are set on both sides of the third combustion chamber 50, and the diameter away from the second combustion chamber 40 is larger than the diameter close to the second combustion chamber 40, and air vents 53 are evenly opened on the shell wall of the third combustion chamber 50 away from the second combustion chamber 40.

[0035] Among them, vent holes 53 are evenly opened on the shell wall of the third combustion chamber 50, which can allow the exhaust gas to enter the third combustion chamber 50 from the side of the third combustion chamber 50 through the vent holes 53, so that the flame and exhaust gas can be fully burned, thereby improving the combustion efficiency of the DPF burner. Example

[0036] Example 6 is an improvement on Example 1, and the improvement includes: the DPF burner also includes: an exhaust gas diffusion plate 60, which is arranged in an arc shape and protrudes toward the side of the first combustion chamber 20, is fixed on the inner side of the burner housing 10, and is fixed on the side away from the first combustion chamber 20.

[0037] The tail gas diffusion plate 60 is fixed to the inner side of the burner housing 10 through a support frame.

[0038] The exhaust gas diffusion plate 60 is provided to allow the flame to spread in a diffusive manner, thereby improving the uniformity of the temperature field.

[0039] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include," "comprise," or any other variations thereof are intended to cover non-exclusive inclusion, so that an article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such article or device. In the absence of further limitations, the elements defined by the phrase "comprising..." do not exclude the presence of other identical elements in the article or device comprising the elements.

[0040] The above embodiments are intended to illustrate the technical solutions of the present invention and are not intended to limit the present invention. The present invention is described in detail with reference to the preferred embodiments. It should be understood by those skilled in the art that the technical solutions of the present invention may be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications and replacements shall be covered by the claims of the present invention.

Claims

1. A DPF burner, characterized in that: include: A burner housing (10) having an air inlet (11) and an air outlet (12) on either side; A first combustion chamber (20) is arranged inside the burner housing (10), and a first swirl plate (21) is fixed at one end; A spray pipe (30), one end of which passes through the first swirl plate (21) and communicates with the first combustion chamber (20), and the other end of which extends outward and passes through the burner housing (10); An igniter (31) passes through the burner housing (10) and the first combustion chamber (20) in sequence; The second combustion chamber (40) is sleeved on the first combustion chamber (20) and fixedly connected to the first combustion chamber (20) via a second swirl plate (41), and the length of the second combustion chamber (40) is at least 1.5 times the length of the first combustion chamber (20).

2. The DPF burner according to claim 1, characterized in that: A first air intake passage (42) is formed between the second combustion chamber (40) and the first combustion chamber (20), and the diameter of the middle portion of the first air intake passage (42) is smaller than the diameters of both ends of the first air intake passage (42), wherein the air intake side of the first air intake passage (42) is arranged in a trumpet-shaped opening.

3. The DPF burner according to claim 1, characterized in that: The DPF burner also includes: The third combustion chamber (50) is sleeved outside the second combustion chamber (40) and is fixedly connected to the second combustion chamber (40) via a third swirl plate (51). The length of the third combustion chamber (50) is at least 1.5 times the length of the second combustion chamber (40).

4. The DPF burner according to claim 3, characterized in that: A second air intake passage (52) is formed between the third combustion chamber (50) and the second combustion chamber (40), and a diameter of a middle portion of the second air intake passage (52) is smaller than a diameter at both ends of the second air intake passage (52).

5. The DPF burner according to claim 4, characterized in that: Both sides of the third combustion chamber (50) are provided with trumpet-shaped openings, and the diameter of the side away from the second combustion chamber (40) is larger than the diameter of the side close to the second combustion chamber (40), and ventilation holes (53) are evenly opened on the shell wall of the third combustion chamber (50) away from the second combustion chamber (40).

6. The DPF burner according to claim 1, characterized in that: The DPF burner also includes: The tail gas diffusion plate (60) is arranged in an arc shape and is convexly arranged toward one side of the first combustion chamber (20), and is fixed to the inner side of the burner housing (10) and to the side away from the first combustion chamber (20).

7. The DPF burner according to claim 1, characterized in that: The DPF burner further comprises: a connecting flange (13) integrally provided on both sides of the burner housing (10).

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