Tail gas purification assembly of marine low-speed diesel engine

Abstract

The utility model relates to the technical field of diesel engine tail gas purification, and discloses a marine low-speed diesel engine tail gas purification assembly which comprises an exhaust collecting pipe, an exhaust manifold is installed on the outer wall of the exhaust collecting pipe, a spray gun support is arranged on one side of the exhaust manifold and communicated with the exhaust collecting pipe, and a spray gun is arranged on the spray gun support. The tail gas purification assembly of the marine low-speed diesel engine comprises an exhaust header, an exhaust manifold, a spray gun support and a spray gun assembly, the spray gun support is internally connected with the spray gun assembly in an inserted mode, and the direction of the spray gun assembly is the same as the axial direction of the exhaust manifold, and through design, the tail gas purification assembly of the marine low-speed diesel engine is composed of the exhaust header, the exhaust manifold, the spray gun support and the spray gun assembly. The spraying direction of the spraying gun assembly is the same as the axial direction of the exhaust manifold, the assembly structure solves the problem that a mixing pipe cannot be installed due to insufficient space in a cabin, the spraying gun assembly is arranged in the exhaust manifold, a mixer and the mixing pipe are omitted, the system is more compact, and meanwhile, the temperature in the exhaust manifold is high, so that evaporation and decomposition of urea sprayed by the spraying gun assembly are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of diesel engine exhaust purification, in particular to an exhaust purification component for a low-speed marine diesel engine. Background Art

[0002] Nitrogen oxides (NOx) in ship diesel engine exhaust are one of the important components of atmospheric pollutants and have a direct impact on the health of humans and animals.

[0003] With the implementation of IMO Tier III regulations and the gradual expansion of emission control areas (ECA), it is increasingly urgent to research and develop processes suitable for ship engine exhaust purification. Selective catalytic reduction (SCR) is one of the most widely recognized effective methods for NOx removal. In recent years, it has played a key role in thermal power generation, automobile, shipbuilding and other industries. This process is to select a suitable reducing agent (ammonia and hydrocarbons, etc.) under the action of a catalyst to selectively catalyze the reaction with nitrogen oxides (NOx) at a certain temperature to generate non-toxic and harmless nitrogen and water.

[0004] However, the existing space in the cabin is insufficient, the mixing tube and the evaporator are too large, occupying a lot of space, and cannot be compactly installed. In addition, urea is easy to accumulate without evaporation equipment. Therefore, those skilled in the art provide a marine low-speed diesel engine exhaust purification component to solve the problems raised in the above background technology. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the utility model provides a marine low-speed diesel engine exhaust purification component to solve the problems of insufficient space in the existing cabin, the large size of the mixing tube and the evaporator, which occupy a lot of space and cannot be installed compactly, and the easy accumulation of urea in the absence of evaporation equipment.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a marine low-speed diesel engine exhaust purification component, comprising an exhaust manifold, an exhaust manifold is installed on the outer wall of the exhaust manifold, a spray gun bracket is arranged on one side of the exhaust manifold, the spray gun bracket is connected to the exhaust manifold, a spray gun assembly is inserted in the spray gun bracket, and the direction of the spray gun assembly is the same as the axial direction of the exhaust manifold.

[0009] Preferably, a first positioning block is installed at one end of the spray gun bracket away from the exhaust manifold, and a positioning hole is formed on the first positioning block.

[0010] Preferably, a second positioning block is installed on the outer wall of the spray gun assembly, and the second positioning block is fitted with the first positioning block.

[0011] Preferably, a movable groove is opened in the second positioning block, a plug-in bracket is arranged in the movable groove, one end of the plug-in bracket inserted in the second positioning block is sleeved with a pressure spring, one end of the pressure spring is connected to the plug-in bracket, and the other end of the pressure spring is in pressure contact with the inner wall of the top end of the movable groove.

[0012] Preferably, one end of the plug-in bracket is plugged into the positioning hole on the first positioning block. Before the first positioning block contacts the second positioning block, the plug-in bracket is pulled up. After the first positioning block contacts the second positioning block, the plug-in bracket is released to plug the plug-in bracket into the positioning hole on the first positioning block, thereby completing the connection between the spray gun assembly and the spray gun bracket. This method facilitates the disassembly and maintenance of the spray gun assembly at a later time.

[0013] (III) Beneficial effects

[0014] Compared with the prior art, the utility model provides a marine low-speed diesel engine exhaust purification component, which has the following beneficial effects:

[0015] Through design, the marine low-speed diesel engine exhaust purification component consists of an exhaust manifold, an exhaust manifold, a spray gun bracket and a spray gun assembly, and the spray gun assembly is plugged into the spray gun bracket, and the spray direction of the spray gun assembly is the same as the axial direction of the exhaust manifold. The component structure solves the problem of insufficient space in the cabin to install a mixing tube. The spray gun assembly is arranged in the exhaust manifold, eliminating the mixer and mixing tube, and the system is more compact. At the same time, the temperature in the exhaust manifold is higher, which is more conducive to the evaporation and decomposition of urea sprayed by the spray gun assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of a marine low-speed diesel engine exhaust purification component provided in an embodiment of the present application.

[0017] Figure 2 It is a structural schematic diagram of a marine low-speed diesel engine exhaust purification component provided in an embodiment of the present application.

[0018] Figure 3 It is a structural schematic diagram of a marine low-speed diesel engine exhaust purification component provided in an embodiment of the present application.

[0019] In the figure: 1. exhaust manifold; 2. exhaust manifold; 3. spray gun bracket; 301. first positioning block; 3011. positioning hole; 4. spray gun assembly; 401. second positioning block; 4011. movable groove; 5. plug-in bracket; 6. pressure spring. DETAILED DESCRIPTION

[0020] 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.

[0021] The utility model provides a technical solution, a marine low-speed diesel engine exhaust purification component, please refer to Figure 1 , including an exhaust manifold 1, an exhaust manifold 2 is installed on the outer wall of the exhaust manifold 1, a spray gun bracket 3 is arranged on one side of the exhaust manifold 2, the spray gun bracket 3 is connected to the exhaust manifold 1, a spray gun assembly 4 is inserted in the spray gun bracket 3, and the direction of the spray gun assembly 4 is the same as the axial direction of the exhaust manifold 2.

[0022] See also Figure 2 , Figure 3 The end of the spray gun bracket 3 away from the exhaust manifold 1 is equipped with a first positioning block 301, and the first positioning block 301 is provided with a positioning hole 3011. The outer wall of the spray gun assembly 4 is equipped with a second positioning block 401, and the second positioning block 401 is fitted with the first positioning block 301. The second positioning block 401 is provided with a movable groove 4011, and a plug-in bracket 5 is arranged in the movable groove 4011. One end of the plug-in bracket 5 inserted in the second positioning block 401 is sleeved with a pressure spring 6, and one end of the pressure spring 6 is connected to the plug-in bracket 5. , the other end of the pressing spring 6 is pressed and contacted with the inner wall of the top end of the movable groove 4011, and one end of the plug-in bracket 5 is plugged into the positioning hole 3011 on the first positioning block 301. Before the first positioning block 301 contacts the second positioning block 401, the plug-in bracket 5 is pulled up. After the first positioning block 301 contacts the second positioning block 401, the plug-in bracket 5 is released to plug the plug-in bracket 5 into the positioning hole 3011 on the first positioning block 301, thereby completing the connection between the spray gun assembly 4 and the spray gun bracket 3. This method is convenient for the later disassembly and maintenance of the spray gun assembly 4.

[0023] The utility model discloses a marine low-speed diesel engine exhaust gas purification component, which is composed of an exhaust manifold 1, an exhaust manifold 2, a spray gun bracket 3 and a spray gun assembly 4, and the spray gun assembly 4 is plugged with the spray gun bracket 3, and the spray direction of the spray gun assembly 4 is the same as the axial direction of the exhaust manifold 2;

[0024] A first positioning block 301 is installed at the end of the spray gun bracket 3 away from the exhaust manifold 1, and a positioning hole 3011 is provided on the first positioning block 301. A second positioning block 401 is installed on the outer wall of the spray gun assembly 4, and a movable groove 4011 is provided in the second positioning block 401. A plug-in bracket 5 is arranged in the movable groove 4011, and one end of the plug-in bracket 5 inserted in the second positioning block 401 is sleeved with a pressure spring 6, one end of the pressure spring 6 is connected to the plug-in bracket 5, and the other end of the pressure spring 6 is in pressure contact with the inner wall of the top end of the movable groove 4011. Before the first positioning block 301 contacts the second positioning block 401, the plug-in bracket 5 is pulled up. After the first positioning block 301 contacts the second positioning block 401, the plug-in bracket 5 is released, so that the plug-in bracket 5 is plugged into the positioning hole 3011 on the first positioning block 301, thereby completing the connection between the spray gun assembly 4 and the spray gun bracket 3. This method is convenient for disassembly and maintenance of the spray gun assembly 4 in the later stage.

[0025] The spray gun assembly is used for the injection of SCR urea, and the urea injection amount of the spray gun assembly 4 is related to the working condition of the diesel engine and the catalyst temperature, and the number of the spray gun assemblies 4 is related to the number of cylinders of the oil production machine;

[0026] When the component is working, the basic urea injection amount is calculated according to the engine working condition, and the injection amount of the spray gun assembly 4 is obtained through correction to be consistent with the exhaust amount of the exhaust manifold 2. The exhaust flow rate is a dependent variable of the reaction catalyst characteristics and is a very important variable in the urea injection control, and the diesel engine exhaust flow rate is the sum of the intake flow rate and the diesel engine fuel injection amount;

[0027] It is worth mentioning that this component structure solves the problem of insufficient space in the cabin to install a mixing tube. The spray gun assembly 4 is arranged in the exhaust manifold 1, eliminating the mixer and the mixing tube, making the system more compact. At the same time, the temperature in the exhaust manifold 1 is higher, which is more conducive to the evaporation and decomposition of urea sprayed by the spray gun assembly 4.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0029] In this document, unless otherwise clearly stipulated and limited, terms such as "installation", "setting", "connection", "fixation", and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in this utility model according to the specific circumstances.

[0030] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A marine low-speed diesel engine exhaust purification assembly, comprising an exhaust manifold (1), characterized in that: An exhaust manifold (2) is mounted on the outer wall of the exhaust manifold (1), a spray gun bracket (3) is arranged on one side of the exhaust manifold (2), the spray gun bracket (3) is connected to the exhaust manifold (1), a spray gun assembly (4) is inserted into the spray gun bracket (3), and the direction of the spray gun assembly (4) is the same as the axial direction of the exhaust manifold (2).

2. The exhaust gas purification component for a low-speed marine diesel engine according to claim 1, characterized in that: A first positioning block (301) is installed at one end of the spray gun bracket (3) away from the exhaust manifold (1), and a positioning hole (3011) is provided on the first positioning block (301).

3. A marine low-speed diesel engine exhaust purification component according to claim 2, characterized in that: A second positioning block (401) is installed on the outer wall of the spray gun assembly (4), and the second positioning block (401) is in contact with the first positioning block (301).

4. The exhaust gas purification assembly for a low-speed marine diesel engine according to claim 3, characterized in that: A movable groove (4011) is provided in the second positioning block (401), and a plug-in bracket (5) is arranged in the movable groove (4011). One end of the plug-in bracket (5) inserted in the second positioning block (401) is sleeved with a pressure spring (6), one end of the pressure spring (6) is connected to the plug-in bracket (5), and the other end of the pressure spring (6) is in pressure contact with the inner wall of the top end of the movable groove (4011).

5. The exhaust gas purification assembly for a low-speed marine diesel engine according to claim 4, characterized in that: One end of the plug-in bracket (5) is plugged into a positioning hole (3011) on the first positioning block (301).

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