A genset exhaust emission treatment system

Abstract

The application provides a generator set exhaust emission treatment system, which comprises a shell, an exhaust gas inlet and an exhaust gas outlet, and further comprises two flow guide tubes which are symmetrically fixedly installed on the inner side of the shell, the two ends of the flow guide tubes are sealingly connected with the shell, the middle axis of the shell is perpendicular to the two flow guide tubes, and a first air inlet is arranged on the side of the flow guide tube close to the exhaust gas inlet; a first inner tube is arranged on the inner side of any flow guide tube and is fixedly connected with the flow guide tube through a first partition plate, a second air inlet is arranged on the side of the first inner tube close to the exhaust gas inlet, and the second air inlet and the first air inlet are arranged on the two sides of the first partition plate respectively; two air outlet pipe groups are arranged on the two flow guide tubes and pass through the first inner tube, and any air outlet pipe group is arranged at equal intervals; and a first partition plate is fixed between the two flow guide tubes. The device generates a spiral flow guide channel through the arrangement of the flow guide tube and the first inner tube, the urea and the exhaust gas flow are fully mixed in the flow guide channel, and the mixing efficiency of the urea and the exhaust gas flow is improved.

Description

Technical Field

[0001] This invention relates to the field of exhaust gas treatment equipment technology, and in particular to a generator set exhaust gas treatment system. Background Technology

[0002] The diesel engine aftertreatment device, namely the SCR system, includes a mixer and a reactor. The mixer is connected to both the diesel engine's exhaust pipe and the reactor, and a urea nozzle is installed within the mixer. The urea sprayed from the nozzle undergoes hydrolysis and pyrolysis reactions in the mixer to generate ammonia. This ammonia then mixes with the NOx-containing exhaust gas in the mixer before flowing into the reactor for a reduction reaction.

[0003] Patent No. CN215633261U discloses a urea mixer and a DOC-DPF-SCR aftertreatment device, including an air inlet swirl tube. The air inlet swirl tube includes a tube body. Along the extension direction of the tube body's axis, one end of the tube body forms a urea injection end for connection with a urea injection assembly, and the other end of the tube body forms an air outlet. Along the circumference of the tube body, the tube wall has multiple spaced air inlets, and swirl vanes are provided on the outer side of the tube body. A swirl disk is located on the inner side of the end of the tube body at the air outlet. The swirl disk has multiple air vents, and multiple swirl vanes corresponding to the air vents are provided on the side of the swirl disk away from the urea injection end of the tube body.

[0004] However, due to the limitations of the cyclone tube and shell size, the flow path of urea and gas inside the cyclone tube is relatively short, resulting in a shorter mixing time for urea and gas and a certain degree of mixing. Summary of the Invention

[0005] To address the above problems, the present invention provides a generator set exhaust gas treatment system.

[0006] The exhaust gas treatment system of the generator set will be described in detail below with reference to the accompanying drawings and embodiments.

[0007] A generator set exhaust gas treatment system includes a casing, an exhaust gas inlet, and an exhaust gas outlet. It further includes: two guide tubes, symmetrically fixedly installed inside the casing, sealed at both ends to the casing and perpendicular to the central axis of the casing, with a first air inlet on the side of each guide tube near the exhaust gas inlet; a first inner tube, disposed inside either guide tube and fixedly connected to it via a first partition, with a second air inlet on the side of the first inner tube near the exhaust gas inlet; the second air inlet and the first air inlet being respectively located on opposite sides of the first partition; two exhaust pipe groups, disposed on the two guide tubes and passing through the first inner tube, with each exhaust pipe group arranged at equal intervals; and a first partition plate fixed between the two guide tubes.

[0008] In a preferred embodiment, the generator set exhaust gas treatment system further includes: a second inner cylinder, which is disposed inside any of the first inner cylinders and is fixedly connected to the first inner cylinders via a second partition. A third air inlet is provided on the side of the second inner cylinder near the exhaust gas inlet. The third air inlet and the second air inlet are respectively disposed on both sides of the second partition. Two exhaust pipe groups pass through the second inner cylinder.

[0009] In a preferred embodiment, the two air outlet pipe groups on the two guide tubes are staggered.

[0010] In a preferred embodiment, the first partition plate is arc-shaped and has ventilation holes.

[0011] In a preferred embodiment, the generator set exhaust gas treatment system further includes a mixing pipe, which includes: a first pipe section, which has a cylindrical annular structure and is connected to the shell through a second partition plate; and a second pipe section, which is fixed to one side of the first pipe section, has a conical annular structure, and is provided with a swirl plate inside to generate swirl in the airflow flowing through the second pipe section.

[0012] In a preferred embodiment, the mixing pipe further includes a third pipe section, which is fixed to one side of the second pipe section and is arranged in a cylindrical structure.

[0013] In a preferred embodiment, the mixing pipe further includes: a third partition plate, which is fixed on one side of the third pipe section and located on the side away from the exhaust gas inlet. It has a conical structure, extends into the third pipe section, and has air outlets at equal intervals on the side wall of the third partition plate. The air outlets are located inside the third pipe section.

[0014] The exhaust gas treatment system for the generator set of this application introduces exhaust gas into the exhaust gas inlet, then through two first air inlets into two guide cylinders on both sides of the casing for guidance. After passing through the first spiral of the first inner cylinder and the guide cylinders, it enters the second air inlet, then flows out through the exhaust pipe assembly, and finally flows out to the exhaust gas outlet. This device, by setting up guide cylinders and the first inner cylinder, generates a spiral guiding channel, within which urea and exhaust gas flow are fully mixed, thereby improving the mixing efficiency of urea and exhaust gas flow. Attached Figure Description

[0015] Other features and advantages of the invention will become clear from the following description of exemplary embodiments, which is incorporated in and constitutes a part of this specification. The accompanying drawings, which illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. In these drawings, similar reference numerals are used to denote similar elements. The drawings described below are some embodiments of the invention, but not all embodiments. Other drawings will be readily available to those skilled in the art based on these drawings without any inventive effort.

[0016] Figure 1Structural diagram of the generator set exhaust gas treatment system of the present invention;

[0017] Figure 2 Structural diagram of the mixing pipe and guide tube of the generator set exhaust gas treatment system of the present invention;

[0018] Figure 3 Structural diagram of the guide tube of the generator set exhaust gas treatment system of the present invention;

[0019] Figure 4 A cross-sectional view of the generator set exhaust gas treatment system of the present invention at location AA;

[0020] In the diagram: 10. Shell; 11. Exhaust gas inlet; 12. Exhaust gas outlet; 20. Guide tube; 21. First air inlet; 22. First inner cylinder; 23. First baffle; 24. Second air inlet; 25. Exhaust pipe assembly; 30. First partition plate; 40. Second inner cylinder; 41. Second baffle plate; 42. Third air inlet; 31. Vent hole; 50. Mixing pipe; 51. First pipe section; 52. Second pipe section; 53. Swirl plate; 54. Third pipe section; 60. Third partition plate; 61. Exhaust port; 511. Second partition plate. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0022] The exhaust gas treatment system of the generator set will be described in detail below with reference to the accompanying drawings and embodiments.

[0023] Example 1

[0024] A generator set exhaust gas treatment system includes a housing 10, an exhaust gas inlet 11, and an exhaust gas outlet 12. It also includes: two guide tubes 20, symmetrically fixedly installed inside the housing 10, with their upper and lower ends sealed to the housing 10 and perpendicular to the central axis of the housing 10; a first air inlet 21 on the side of the guide tube 20 near the exhaust gas inlet 11; a first inner tube 22, located inside either guide tube 20 and fixedly connected to the guide tube 20 via a first partition 23; a second air inlet 24 on the side of the first inner tube 22 near the exhaust gas inlet 11; the second air inlet 24 and the first air inlet 21 being located on opposite sides of the first partition 23; two exhaust pipe groups 25, located on the two guide tubes 20 and passing through the first inner tube 22; and a first partition plate 30 fixed between the two guide tubes 20.

[0025] During operation, exhaust gas enters through exhaust gas inlet 11, then flows through two first air inlets 21 into two guide tubes 20 on both sides of the housing 10. After passing through the first inner tube 22 and the first spiral of the guide tubes 20, it enters the second air inlet 24, then flows out through the exhaust pipe assembly 25, and finally flows out to the exhaust gas outlet 12. This device, by setting the guide tubes 20 and the first inner tube 22, generates a spiral guide channel, in which urea and exhaust gas flow are fully mixed, thereby improving the mixing efficiency of urea and exhaust gas flow.

[0026] Example 2

[0027] Example 2 is an improvement upon Example 1, and the improvements include:

[0028] The generator set exhaust gas treatment system also includes: a second inner cylinder 40, which is located inside any of the first inner cylinders 22 and is fixedly connected to the first inner cylinder 22 via a second partition 41. A third air inlet 42 is provided on the side of the second inner cylinder 40 near the exhaust gas inlet 11. The third air inlet 42 and the second air inlet 24 are respectively located on both sides of the second partition 41. Two exhaust pipe groups 25 pass through the second inner cylinder 40.

[0029] Based on Example 1, a second inner cylinder 40 is added, allowing the urea and exhaust gas flow to enter the third air inlet 42 after passing through two spirals, and finally flow out from the exhaust pipe group 25 to the exhaust gas outlet 12. This device improves the mixing efficiency of urea and exhaust gas flow by setting two spiral guide channels, which allow for thorough mixing of urea and exhaust gas flow.

[0030] Example 3

[0031] Example 3 is an improvement on Example 1, and the improvement includes: the two air outlet pipe groups 25 on the two guide tubes 20 are misaligned.

[0032] This device uses a staggered outlet pipe assembly 25 to create a mixed airflow of urea and exhaust gas flowing from the two guide tubes 20. This mutual turbulence and flow improves the thorough mixing of the urea and exhaust gas, thereby increasing the mixing efficiency of the urea and exhaust gas flow.

[0033] Example 4

[0034] Example 4 is an improvement on Example 1. The improvement includes: the first partition plate 30 is arranged in an arc shape, and a vent hole 31 is provided on the first partition plate 30.

[0035] This device has a vent 31 provided in the first partition plate 30, which causes the urea and exhaust gas mixed airflow flowing out of the two guide tubes 20 to turbulently flow with the mixed airflow flowing out of the vent 31, thereby increasing the turbulence and improving the full mixing of the urea and exhaust gas airflow, and thus improving the mixing efficiency of the urea and exhaust gas airflow.

[0036] Example 5

[0037] Example 5 is an improvement upon Example 1, and the improvements include:

[0038] The generator set exhaust gas treatment system also includes a mixing pipe 50, which includes: a first pipe section 51, which has a cylindrical annular structure and is connected to the housing 10 through a second partition plate 511; and a second pipe section 52, which is fixed on one side of the first pipe section 51, has a conical annular structure, and is provided with a swirl plate 53 inside, which is used to generate swirl in the airflow flowing through the second pipe section 52.

[0039] This device, by setting up a mixing pipe 50, further mixes the urea and waste gas mixture before it passes through the guide tube 20. Specifically, the mixed gas enters the mixing pipe 50 from the first pipe section 51, and then generates a swirling flow in the second pipe section 52. Since the second pipe section 52 has a conical annular structure, the flow velocity increases and the degree of turbulence intensifies while generating the swirling flow, thereby improving the full mixing of the urea and waste gas mixture and thus improving the mixing efficiency of the urea and waste gas mixture.

[0040] Example 6

[0041] Example 6 is an improvement upon Example 1, and the improvement includes:

[0042] The mixing pipe 50 also includes a third pipe section 54, which is fixed on one side of the second pipe section 52 and has a cylindrical structure.

[0043] The mixing pipe 50 also includes a third partition plate 60, which is fixed on one side of the third pipe section 54 and located on the side away from the exhaust gas inlet 11. It has a conical structure, extends into the third pipe section 54, and has air outlets 61 at equal intervals on the side wall of the third partition plate 60. The air outlets 61 are located inside the third pipe section 54.

[0044] This device, by setting a third pipe section 54 and a third partition plate 60, ensures that when the mixed airflow flows out of the third pipe section 54, it is blocked and turbulent by the conical structure of the third partition plate 60, and then evenly distributed to the outlet 61 for outflow, and finally flows into the guide tube 20. Since the guide tube 20 only has a first air inlet 21 on both sides of the shell 10, the mixed airflow from the arc-shaped outlet 61 flows into the straight first air inlet 21, thereby generating a certain velocity difference, thereby enhancing the turbulence between the airflows, improving the full mixing of urea and exhaust gas, and thus improving the mixing efficiency of urea and exhaust gas.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, 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 an article or apparatus comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the article or apparatus that includes that element.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. The present invention has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications and substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A generator set exhaust gas treatment system, comprising a casing (10), an exhaust gas inlet (11), and an exhaust gas outlet (12), characterized in that, Also includes: Two guide tubes (20) are symmetrically fixedly installed inside the housing (10), with their upper and lower ends sealed to the housing (10) and set perpendicular to the central axis of the housing (10). A first air inlet (21) is provided on the side of the guide tube (20) near the exhaust gas inlet (11). The first inner cylinder (22) is disposed inside each of the guide cylinders (20) and is fixedly connected to the guide cylinders (20) through the first partition (23). A second air inlet (24) is provided on the side of the first inner cylinder (22) near the exhaust gas inlet (11). The second air inlet (24) and the first air inlet (21) are respectively disposed on both sides of the first partition (23). Two air outlet pipe groups (25) are set on the two guide tubes (20) and pass through the first inner tube (22). Each air outlet pipe group (25) is arranged at equal intervals. The first partition plate (30) is fixed between the two guide tubes (20); The generator set exhaust gas treatment system further includes a mixing pipe (50), which comprises: The first pipe section (51) has a cylindrical annular structure and is connected to the shell (10) through the second partition plate (511); The second pipe section (52) is fixed on one side of the first pipe section (51), and has a conical ring structure. It is equipped with a swirl plate (53) to generate swirl in the airflow flowing through the second pipe section (52). The third pipe section (54) is fixed on one side of the second pipe section (52) and is arranged in a cylindrical structure; The third partition plate (60) is fixed on one side of the third pipe section (54) and is located on the side away from the exhaust gas inlet (11). It has a conical structure, extends into the third pipe section (54), and has air outlets (61) at equal intervals on the side wall of the third partition plate (60). The air outlets (61) are located inside the third pipe section (54).

2. The generator set exhaust gas treatment system according to claim 1, characterized in that, The generator set exhaust gas treatment system also includes: The second inner cylinder (40) is disposed inside each of the first inner cylinders (22) and is fixedly connected to the first inner cylinder (22) by the second partition (41). A third air inlet (42) is provided on the side of the second inner cylinder (40) near the exhaust gas inlet (11). The third air inlet (42) and the second air inlet (24) are respectively disposed on both sides of the second partition (41). The two exhaust pipe groups (25) pass through the second inner cylinder (40).

3. The generator set exhaust gas treatment system according to claim 1, characterized in that, The two air outlet pipe groups (25) on the two guide tubes (20) are staggered.

4. The generator set exhaust gas treatment system according to claim 1, characterized in that, The first partition plate (30) is arc-shaped, and a vent hole (31) is provided on the first partition plate (30).

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