Post-treatment device for hydrogen internal combustion engine
By combining a side-entry centrifugal water vapor separator and a catalytic muffler, the problem of water vapor aging the catalyst in the exhaust gas of hydrogen internal combustion engines is solved, achieving efficient NOx purification and sustained net-zero emissions from hydrogen internal combustion engines.
Patent Information
- Application Number
- CN202423214371.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-12-25
AI Technical Summary
Traditional catalysts are prone to aging and failure under the high water vapor content exhaust conditions of hydrogen internal combustion engines, making it difficult to effectively reduce NOx emissions and becoming a bottleneck for the commercialization of hydrogen internal combustion engines.
A combination of a side-entry centrifugal water vapor separator and a catalytic silencing device is adopted. Using a cyclone plate and a stainless steel winding mesh assembly, water vapor is first centrifugally condensed into liquid water, and then the water vapor content is reduced by the H2-SCR catalytic unit to protect the catalyst activity.
It effectively reduces the water vapor content in the exhaust gas, reduces the risk of hydrothermal aging of the catalyst, and ensures the long-lasting net-zero emission performance of the hydrogen internal combustion engine.
Smart Images
Figure CN223523809U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to hydrogen fuel cell engine technical field, especially relates to a kind of aftertreatment device for hydrogen internal combustion engine. BACKGROUND
[0002] Under the global energy-saving emission reduction trend, it is imminent for transportation industry to accelerate the process of carbon reduction and decarbonization. Hydrogen energy, as a key element to promote energy transformation and upgrading, has become the focus of commercial vehicle and internal combustion engine enterprises, with diversified technology research and development around hydrogen fuel. Among them, hydrogen internal combustion engine not only meets the emission reduction requirements, but also can be comparable to traditional internal combustion engine in terms of use cost. Hydrogen internal combustion engine is an internal combustion engine that uses hydrogen as fuel. It generates power by burning hydrogen, similar to the working principle of traditional fuel internal combustion engine, but the fuel is different. Traditional internal combustion engines using gasoline, diesel and natural gas can be adapted to use hydrogen fuel, which can reduce carbon dioxide emissions in exhaust gas by more than 99%. Strengthening the research, development and production of hydrogen internal combustion engine helps to accelerate the transition to carbon neutral technology and achieve net zero carbon dioxide emissions by 2050. Hydrogen combustion only produces water and no greenhouse gases such as carbon dioxide, which is environmentally friendly. Hydrogen can be produced by water electrolysis, biomass gasification and other methods, and is a renewable energy source. Compared with fuel cells, hydrogen internal combustion engine has lower cost and can utilize existing internal combustion engine production and supply chain to achieve fuel substitution through minor modifications. In addition to harmless emissions such as water vapor, hydrogen engine also produces harmful emissions such as NOx, which need to be treated with targeted purification. However, the high exhaust gas temperature and high water content caused by its working characteristics pose a severe challenge to the aftertreatment catalyst system. Traditional catalysts often perform poorly under such extreme conditions, and even fail, becoming a major technical bottleneck restricting the commercialization of hydrogen internal combustion engine. Current H2-SCR catalyst technology still has difficulty in solving water and heat aging problems, and how to condense and discharge the high water vapor content exhaust gas before it reaches the catalyst is a problem that needs to be solved. SUMMARY
[0003] The utility model provides a kind of aftertreatment device for hydrogen internal combustion engine, its purpose is to make the water vapor in hydrogen internal combustion engine exhaust condense into liquid water state and discharge in advance, avoid a large amount of water vapor to flow through SCR catalyst and make catalyst deteriorate prematurely, ensure that aftertreatment device can continuously reduce NOx pollutant, improve service life.
[0004] The utility model solves the technical problem of the scheme:
[0005] An aftertreatment device for hydrogen internal combustion engine, characterized by:
[0006] Having a side-in centrifugal water vapor separation device and a catalytic muffler device connected to each other;
[0007] The side wall of the air inlet cylinder of the side-inlet centrifugal water-vapor separation device is provided with an air inlet pipe;
[0008] The cyclone cylinder is installed in the air inlet cylinder, and a cyclone cavity is formed between the inner wall of the air inlet cylinder and the outer wall of the cyclone cylinder;
[0009] The bottom of the cyclone plate is connected to the outer wall of the cyclone cylinder, and the top is connected to the junction line of the air inlet pipe and the air inlet cylinder, the cyclone plate separates the cyclone cavity, the obtuse angle formed by the cyclone plate and the cyclone cylinder faces the air inlet pipe, the acute angle formed by the cyclone plate and the cyclone cylinder is adjacent to the opening area on the cyclone cylinder, and the opening area is provided with a mesh hole;
[0010] The part connected to the catalytic muffler device of the cyclone cylinder is provided with a stainless steel winding net.
[0011] The catalytic cylinder of the catalytic muffler device is provided with an H2-SCR catalytic unit;
[0012] The rear part of the catalytic cylinder is provided with a muffler core;
[0013] The rear end of the catalytic cylinder is provided with an air outlet pipe.
[0014] The support cone pipe connects the air inlet pipe and the air inlet cylinder.
[0015] The air inlet pipe is provided with a temperature sensor seat and a urea nozzle base.
[0016] The stainless steel winding net is woven into a wave-peak and wave-valley shape by cylindrical stainless steel wires, and is wound layer by layer.
[0017] The catalytic cylinder of the catalytic muffler device is provided with a drainage hole.
[0018] The catalytic cylinder is provided with a nitrogen-oxygen sensor base.
[0019] The muffler core is a resistance composite muffler structure. Beneficial effects
[0020] 1. The side-inlet centrifugal water-vapor separation device is convenient for vehicle arrangement, can form cyclone of tail gas, and water vapor is thrown to the inner wall of the cylinder after centrifugal action, forms liquid water after cooling, and is discharged after settlement;
[0021] 2. The water vapor that has not formed liquid water after centrifugal force is further settled after passing through the stainless steel winding net assembly (the specific surface area of the stainless steel winding net is large);
[0022] 3. The water vapor content of the H2-SCR catalytic unit after passing through the water-vapor separation device can be obviously reduced, the water thermal aging risk is reduced, the catalyst activity is ensured, and the hydrogen internal combustion engine can meet the net zero emission for a long time. BRIEF DESCRIPTION OF DRAWINGS
[0023] Figure 1It is a hydrogen internal combustion engine aftertreatment device appearance;
[0024] Figure 2 It is a side-in centrifugal water-vapor separation device view;
[0025] Figure 3 It is a hydrogen internal combustion engine aftertreatment device sectional view;
[0026] Figure 4 It is a stainless steel winding net structure view. DETAILED DESCRIPTION
[0027] The utility model will be explained further in connection with the drawings and specific embodiments.
[0028] In order to more clearly illustrate the technical scheme of the utility model, the drawings needed to be used in the description will be simply introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and other embodiments can be obtained according to these drawings without creating labor for the ordinary skilled in the art.In order to facilitate the understanding of the utility model, the utility model will be explained in more detail in connection with the drawings and specific embodiments.
[0029] The utility model is a hydrogen internal combustion engine aftertreatment device, and the horn mouth cylinder of the mixed structure cooperates with the hump pipe at the rear end of the particle trap, and the rear end is welded with the front end of the selective catalytic reduction converter.
[0030] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 ,
[0031] The utility model provides a hydrogen internal combustion engine aftertreatment device.
[0032] As shown in Figure 1 , the aftertreatment device in the utility model includes the side-in centrifugal water-vapor separation device 1 and the catalytic muffler device 2 connected with each other.
[0033] The side-in centrifugal water-vapor separation device 1 as shown in Figure 2 , Figure 3 ,
[0034] The side wall of the air inlet cylinder 9 is provided with the air inlet pipe 4, and the air inlet end of the air inlet pipe 4 is provided with the air inlet flange 3 connected with the outside, and the support cone pipe 5 connects the air inlet pipe 4 and the air inlet cylinder 9 to play a supporting role.
[0035] The air inlet pipe 4 is provided with the temperature sensor seat 6, the temperature sensor can be installed to monitor the tail gas temperature, so that the injection time of the reducing agent urea can be controlled, and the urea nozzle base 7 is further arranged, the urea nozzle can be arranged to spray the urea water solution.
[0036] The end of the intake cylinder 9 away from the catalytic muffler device 2 is provided with an intake end cover 11 and an intake inner end cover 12.
[0037] The swirl cylinder 8 is installed in the intake cylinder 9, and a swirl cavity 82 is formed between the inner wall of the intake cylinder 9 and the outer wall of the swirl cylinder 8.
[0038] The bottom of the swirl plate 81 is connected to the outer wall of the swirl cylinder 8, and the top is connected to the junction line of the intake pipe 4 and the intake cylinder 9. The swirl plate 81 divides the swirl cavity 82, and the obtuse angle formed by the swirl plate 81 and the swirl cylinder 8 is directed towards the intake pipe 4. The acute angle formed by the swirl plate 81 and the swirl cylinder 8 is adjacent to the opening area on the swirl cylinder 8, and the opening area is provided with a mesh 80. The mesh 80 can form high-speed swirl while ensuring that the resistance of the aftertreatment device does not increase.
[0039] The part of the swirl cylinder 8 connected to the catalytic muffler device 2 is provided with a partition plate 13. The through hole of the partition plate 13 is provided with a stainless steel winding mesh 10 as shown in Figure 4 The stainless steel winding mesh 10 is a wire cake made of stainless steel wire by rolling and brazing. The stainless steel winding mesh 10 is woven into a wave shape by cylindrical stainless steel wire, and is wound layer by layer. It has the characteristics of large specific surface area, strong heat storage capacity and good sound attenuation effect.
[0040] The exhaust gas flows into the intake pipe 4 and is blocked by the swirl plate 81. It rotates around the outer wall of the swirl cylinder 8 in the swirl cavity 82. After about one rotation, it flows into the inner cavity of the swirl cylinder 8 through the mesh 80 on the swirl cylinder 8 (as shown by the rotating arrow). Then it flows through the stainless steel winding mesh 10. During this process, part of the water vapor in the high-temperature gas is pre-cooled and condensed on the surface of the intake cylinder 9, forming liquid water, and part of the gas is settled after passing through the stainless steel winding mesh 10. Figure 2 The water vapor separation device is a side-in centrifugal structure, which forms high-speed swirl in the originally smooth gas flow, and the water vapor is pre-cooled and condensed after hitting the wall.
[0041] As shown in Figure 3
[0042] A drain hole 20 is provided on the catalytic cylinder 14 to facilitate the timely discharge of liquid water separated in the water vapor separation device.
[0043] A nitrogen oxygen sensor base 17 is provided on the catalytic cylinder 14 to facilitate the installation of a nitrogen oxygen sensor, which can monitor the concentration of nitrogen oxides in the exhaust in real time, facilitate the reasonable control of the amount of urea injection, and perform closed-loop control on the urea injection.
[0044] A gasket 15 is installed on the inner wall of the catalytic cylinder 14, and an H2-SCR catalytic unit 16 for hydrogen internal combustion engine is installed in the gasket 15.
[0045] The catalytic cylinder 14 is provided with a muffling core 18 at the rear part.
[0046] The catalytic cylinder 14 is provided with a muffling core 18 at the rear part.
[0047] The hydrogen internal combustion engine water vapor separation post-processing device is provided with a side-in centrifugal water vapor separation device in front of the post-processing, and the exhaust gas is condensed and settled twice in the water vapor separation device, so that the water vapor flowing through the H2-SCR catalytic unit is reduced to the maximum, and the long-term activity of the catalyst is ensured.
[0048] The above is only the preferred embodiment of the present application, and it should be pointed out that, for those skilled in the art, without departing from the technical solutions of the present application, a number of modifications or equivalent replacements can be made, for example, the centrifugal water vapor separation structure in the present application can be arranged separately or adopt radial air inlet, the outer cylinder with circular cross section can also be replaced by elliptical, oval, square, round square or other equivalent shapes, which are all considered as the protection scope of the present application.
[0049] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts of each embodiment can be referred to each other. The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications of the embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. An exhaust treatment device for a hydrogen internal combustion engine, characterized by: The application relates to a side-inlet centrifugal water-vapor separation device and a catalytic muffler device which are connected with each other, wherein a side wall of an air inlet cylinder of the side-inlet centrifugal water-vapor separation device is provided with an air inlet pipe; a cyclone cylinder is arranged in the air inlet cylinder, and a cyclone cavity is formed between an inner wall of the air inlet cylinder and an outer wall of the cyclone cylinder; a bottom of a cyclone plate is connected with the outer wall of the cyclone cylinder, and a top of the cyclone plate is connected with a joint line of the air inlet pipe and the air inlet cylinder; the cyclone plate separates the cyclone cavity; an obtuse angle formed by the cyclone plate and the cyclone cylinder is directed towards the air inlet pipe; an acute angle formed by the cyclone plate and the cyclone cylinder is adjacent to an open hole region of the cyclone cylinder, and the open hole region is provided with a mesh hole; a part of the cyclone cylinder which is connected with the catalytic muffler device is provided with a stainless steel winding net; an H2-SCR catalytic unit is arranged in a catalytic cylinder of the catalytic muffler device; a muffling core body is arranged at a rear part of the catalytic cylinder; and an air outlet pipe is arranged at a rear end of the catalytic cylinder.
2. The aftertreatment device for a hydrogen internal combustion engine according to claim 1, characterized by: A support cone pipe connects the air inlet pipe and the air inlet cylinder.
3. The aftertreatment device for a hydrogen internal combustion engine according to claim 1, characterized by: A temperature sensor seat and a urea nozzle base are arranged on the air inlet pipe.
4. The aftertreatment device for a hydrogen internal combustion engine according to claim 1, characterized by: The stainless steel winding net is woven into a wave-peak and wave-valley shape by cylindrical stainless steel wires and is wound layer by layer.
5. The aftertreatment device for a hydrogen internal combustion engine according to claim 1, characterized by: A drain hole is arranged on the catalytic cylinder of the catalytic muffler device.
6. The aftertreatment device for a hydrogen internal combustion engine according to claim 1, characterized by: A nitrogen-oxygen sensor base is arranged on the catalytic cylinder.
7. The aftertreatment device for a hydrogen internal combustion engine according to claim 1, characterized by: The muffling core body is a resistance composite muffling structure.