Denitration treatment device for large internal combustion engine

Abstract

The utility model provides a denitration treatment device for a large internal combustion engine, which relates to the technical field of exhaust denitration, and comprises a protective box body, an exhaust pipeline is arranged in the protective box body, two ends of the exhaust pipeline are an air inlet and an air outlet, and an ejector is arranged on the inner wall of the pipeline of the air outlet. Horn mouths at two ends of the ejector are respectively an interface chamber and a diffusion chamber, a middle diameter opening of the ejector is a mixing chamber, a plurality of mixing baffles which are arranged in sequence are arranged in the mixing chamber, a conveying pipe is arranged in the ejector close to the mixing baffles, and the other end of the conveying pipe is connected with a water pump. Waste gas discharged by an internal combustion engine enters the ejector through the gas inlet, meanwhile, the water pump is started to pump out denitration liquid such as urea stored in the water tank, the denitration liquid enters the ejector through the conveying pipe and is mixed with the waste gas under the action of the mixing baffle, and full mixing of the waste gas and the denitration liquid is promoted through the design of the mixing baffle. And the denitration effect and the standard-reaching rate of exhaust are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of exhaust gas denitration, in particular to a large internal combustion engine denitration treatment device. Background Art

[0002] Internal combustion engines produce a large amount of nitrogen oxides during combustion. In order to prevent environmental pollution and reduce harm to human health, the exhaust gas emitted by internal combustion engines needs to be denitrified.

[0003] After searching, a low-concentration gas internal combustion engine flue gas denitrification catalytic device disclosed with an existing patent announcement number of CN208406632U includes a catalytic device body, a guide box, a flue gas duct, a nine-square grid, a honeycomb catalyst plate and an exhaust pipe, and its characteristics are that the head of the catalytic device body is connected to the flue gas duct, the front section of the catalytic device body is provided with a guide box, the inside of the guide box is provided with a nine-square grid, the rear section of the catalytic device body is built-in with 5 to 12 honeycomb catalyst plates, and the tail of the catalytic device body is connected to the exhaust pipe; one side of the catalytic device body is provided with a detachable plate.

[0004] However, in actual use, the utility model uses urea for denitrification, but the urea is not fully mixed with the exhaust gas, resulting in a general denitrification effect of the exhaust gas, affecting the emission compliance rate of the exhaust gas. Utility Model Content

[0005] The technical solution of the utility model is aimed at the existing technology that solves too single technical problems, and provides a solution that is significantly different from the existing technology. In order to overcome the above defects of the existing technology, the utility model provides a new solution to solve the problems raised in the above background technology.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a large internal combustion engine denitrification treatment device, including a protective box body, an exhaust pipe is arranged inside the protective box body, the two ends of the exhaust pipe are an air inlet and an exhaust port, an ejector is installed on the inner wall of the exhaust port pipe, the bell mouths at both ends of the ejector are an interface chamber and a diffusion chamber respectively, the middle diameter outlet of the ejector is a mixing chamber, a plurality of mixing baffles arranged in sequence are arranged inside the mixing chamber, a delivery pipe is arranged inside the ejector near the mixing baffle, the other end of the delivery pipe is connected to a water pump, and the input end of the water pump is installed inside the water tank below.

[0007] Optionally, the interior of the injector is an hourglass-shaped structure.

[0008] Optionally, a first window and a second window are respectively formed on the top of the protective box and the outer shell.

[0009] Optionally, both the first window and the second window are provided with filters.

[0010] Optionally, a mounting frame is provided on the top of the protective box near the first window.

[0011] Optionally, a fan is fixed on the mounting frame.

[0012] Optionally, a built-in electric heater is installed inside the exhaust duct.

[0013] Optionally, a plurality of electric heating blocks are also installed on the outer wall of the exhaust duct.

[0014] Compared with the prior art, the advantages and positive effects of the utility model are:

[0015] In the utility model, the exhaust gas discharged by the internal combustion engine enters the injector through the air inlet, and at the same time, the water pump is started to extract the denitrification liquid such as urea stored in the water tank. The denitrification liquid enters the injector through the delivery pipe, and is mixed with the exhaust gas under the action of the mixing baffle. The design of the mixing baffle promotes the full mixing of the exhaust gas and the denitrification liquid, thereby improving the denitrification effect and compliance rate of the exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A three-dimensional diagram of a large internal combustion engine denitration treatment device provided by the utility model;

[0017] Figure 2 A schematic cross-sectional structure diagram of a large internal combustion engine denitration treatment device provided by the utility model;

[0018] Figure 3 The utility model provides a schematic diagram of the cross-sectional structure of the interior of an injector of a large internal combustion engine denitration treatment device.

[0019] Legend:

[0020] 1. Protective box; 2. Air inlet; 3. Exhaust port; 4. First window; 5. Second window; 6. Filter; 7. Ejector; 8. Water tank; 9. Water pump; 10. Delivery pipe; 11. Built-in electric heater; 12. Electric heating block; 13. Mounting bracket; 14. Fan; 15. Interface chamber; 16. Mixing chamber; 17. Diffusion chamber; 18. Mixing baffle. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Example

[0023] like Figure 1 , Figure 2 and Figure 3 As shown, the utility model provides a technical solution: a large internal combustion engine denitration treatment device, including a protective box body 1, an exhaust pipe is arranged inside the protective box body 1, the two ends of the exhaust pipe are an air inlet 2 and an exhaust port 3, an ejector 7 is installed on the inner wall of the exhaust port 3, the bell mouths at both ends of the ejector 7 are an interface chamber 15 and a diffusion chamber 17 respectively, the middle diameter outlet of the ejector 7 is a mixing chamber 16, a plurality of mixing baffles 18 arranged in sequence are arranged inside the mixing chamber 16, a delivery pipe 10 is arranged near the mixing baffle 18 inside the ejector 7, the other end of the delivery pipe 10 is connected to a water pump 9, the input end of the water pump 9 is installed inside the lower water tank 8, and the interior of the ejector 7 is an hourglass-shaped structure.

[0024] In this embodiment, the exhaust gas discharged by the internal combustion engine enters the injector 7 through the air inlet 2, and at the same time, the water pump 9 is started to extract the denitrification liquid such as urea stored in the water tank 8. The denitrification liquid enters the injector 7 through the delivery pipe 10, and is mixed with the exhaust gas under the action of the mixing baffle 18. The design of the mixing baffle 18 promotes the full mixing of the exhaust gas and the denitrification liquid, thereby improving the denitrification effect and compliance rate of the exhaust gas, and the hourglass-shaped structure makes the injector 7 have a Venturi effect, which further promotes the mixing of liquid and gas and achieves a high-efficiency denitrification effect.

[0025] A first window 4 and a second window 5 are respectively provided on the top and the outer shell of the protection box body 1. The first window 4 and the second window 5 are both provided with a filter screen 6. A mounting frame 13 is provided on the top of the protection box body 1 near the first window 4, and a fan 14 is fixed on the mounting frame 13.

[0026] In this embodiment, the first window 4 and the second window 5 provide a heat dissipation channel, and multiple fans 14 are started at the same time, so as to accelerate the circulation of air between the inside of the protective box 1 and the outside air, thereby cooling the inside of the protective box 1 to reduce the damage of high temperature to the exhaust pipe, and the filter 6 plays the role of filtering dust.

[0027] A built-in electric heater 11 is installed inside the exhaust pipe, and a plurality of electric heating blocks 12 are also installed on the outer wall of the exhaust pipe.

[0028] In this embodiment, the exhaust pipe can be heated persistently and evenly by the built-in electric heater 11 and the electric heating block 12, thereby improving the mixing degree between the exhaust gas and the denitrification liquid, which is beneficial to improving the denitrification effect. In addition, the design and materials of the exhaust pipe can usually withstand a certain temperature difference, and the pipe will not become brittle or damaged due to excessive temperature difference between the inside and outside of the pipe.

[0029] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A large internal combustion engine denitration treatment device, comprising a protective box (1), characterized in that: An exhaust pipe is provided inside the protective box (1), and the two ends of the exhaust pipe are an air inlet (2) and an exhaust port (3). An ejector (7) is installed on the inner wall of the exhaust port (3). The two ends of the ejector (7) are respectively an interface chamber (15) and a diffusion chamber (17). The middle diameter outlet of the ejector (7) is a mixing chamber (16). A plurality of mixing baffles (18) arranged in sequence are provided inside the mixing chamber (16). A delivery pipe (10) is provided inside the ejector (7) near the mixing baffle (18). The other end of the delivery pipe (10) is connected to a water pump (9). The input end of the water pump (9) is installed inside the water tank (8) below.

2. A large internal combustion engine denitration treatment device according to claim 1, characterized in that: The interior of the ejector (7) is an hourglass-shaped structure.

3. A large internal combustion engine denitration treatment device according to claim 1, characterized in that: The top of the protective box (1) and the outer shell are respectively provided with a first window (4) and a second window (5).

4. A large internal combustion engine denitration treatment device according to claim 3, characterized in that: Filter screens (6) are provided on both the first window (4) and the second window (5).

5. A large internal combustion engine denitration treatment device according to claim 1, characterized in that: A mounting frame (13) is provided at the top of the protection box (1) near the first window (4).

6. A large internal combustion engine denitration treatment device according to claim 5, characterized in that: A fan (14) is fixed on the mounting frame (13).

7. A large internal combustion engine denitration treatment device according to claim 1, characterized in that: A built-in electric heater (11) is installed inside the exhaust pipe.

8. A large internal combustion engine denitration treatment device according to claim 1, characterized in that: A plurality of electric heating blocks (12) are also installed on the outer wall of the exhaust pipe.

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