X-shaped static mixer of selective catalytic reduction denitration system

Abstract

The utility model discloses an X-shaped static mixer of a selective catalytic reduction denitration system, which relates to the technical field of chemical engineering and comprises a mixing pipe, the mixing pipe is arranged in a mixing area inside a flue, a plurality of mixing units are arranged in an inner cavity of the mixing pipe and are connected together in a welding manner, and the mixing units are arranged in the mixing area. The mixing unit is composed of a plurality of crossed transverse strips according to a certain rule, the transverse strips are connected together in a welding mode, the left end and the right end of the mixing pipe are fixedly connected with first connecting flanges, and first sealing rings are movably installed on the surfaces of the first connecting flanges. According to the X-shaped static mixer of the selective catalytic reduction denitration system, due to the arrangement of the mixing unit, mixed fluid rotates leftwards and rightwards sometimes, the flowing direction is changed continuously, it is ensured that the fluid in the X-shaped static mixer is mixed uniformly, and the phenomena of dead zones and vortexes are avoided, so that the reaction between ammonia gas and nitrogen oxide is effectively promoted; and the denitration efficiency of the SCR denitration system is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical engineering, and particularly relates to an X-shaped static mixer of a selective catalytic reduction denitration system. Background Art

[0002] The static mixer of the catalytic reduction denitrification system is a device used for gas mixing, usually used to effectively mix two or more gases together. It belongs to the field of catalyst and gas mixing. In this application, the static mixer mainly plays the role of a gas distributor and mixer to improve the diffusion performance of the reducing agent and increase its contact efficiency with the catalyst surface.

[0003] At present, there are few studies on the market analyzing the effects of different structural components of SMX static mixing elements on the mixing effect of reductant and flue gas at the inlet flue of SCR denitrification system. The cost is high, and it is difficult for researchers to determine the optimal position of SMX static mixing elements from the inlet of catalyst layer, which is not conducive to in-depth research on static mixers in SCR denitrification reduction systems. Utility Model Content

[0004] The technical problem to be solved by the utility model is that there are few studies on the market analyzing the mixing effect of different structural elements of SMX type static mixing elements on the reducing agent and flue gas at the inlet flue of the SCR denitration system, and the cost is relatively high.

[0005] The technical solution adopted by the utility model to solve its technical problems is: an X-shaped static mixer of a selective catalytic reduction denitrification system, comprising a mixing tube, wherein the mixing tube is arranged in a mixing zone inside a flue, wherein an inner cavity of the mixing tube is provided with a plurality of mixing units, wherein the plurality of mixing units are connected together by welding, wherein the mixing unit is composed of a plurality of crossed horizontal bars according to a certain rule, wherein the plurality of the horizontal bars are connected together by welding, wherein both left and right ends of the mixing tube are fixedly connected with a first connecting flange, wherein a first sealing ring is movably installed on the surface of the first connecting flange.

[0006] As a preferred embodiment of the present invention, a guide pipe is fixedly connected to the top of the mixing tube, and a second connecting flange is fixedly connected to the top of the guide pipe.

[0007] As a preferred embodiment of the present invention, a second sealing ring is fixedly and movably mounted on the surface of the second connecting flange.

[0008] As a preferred embodiment of the present invention, the mixing unit is cylindrical as a whole.

[0009] As a preferred embodiment of the present invention, a plurality of mounting holes are provided on the surfaces of the first connecting flange and the second connecting flange.

[0010] As a preferred embodiment of the present invention, the ratio L / D of the length to the diameter of the mixing tube is 5-10.

[0011] As a preferred embodiment of the present invention, the material of the mixing tube is stainless steel.

[0012] The beneficial effects of the utility model are:

[0013] 1. The X-shaped static mixer of the selective catalytic reduction denitration system, through the setting of the mixing unit, makes the mixed fluid sometimes rotate to the left and sometimes rotate to the right, constantly changing the flow direction, ensuring that the fluid inside the X-shaped static mixer is evenly mixed, avoiding the generation of dead zones and vortex phenomena, thereby effectively promoting the reaction between ammonia and nitrogen oxides, improving the denitration efficiency of the SCR denitration system, and reducing environmental protection operation costs. By installing a first sealing ring on the surface of the first connecting flange and setting a sealing ring on the surface of the connecting flange, the structural design of the X-shaped static mixer is optimized to ensure even mixing of the fluid and improve mixing efficiency. By placing the mixing tube in the mixing zone inside the flue, it can help researchers determine the best position of the SMX static mixer in the SCR reaction system, and provide technical support for the technical transformation of the cooperative units.

[0014] 2. The X-shaped static mixer of the selective catalytic reduction denitration system can guide the fluid to flow into the mixing tube at a specific speed and direction through the setting of the guide tube to ensure the uniform mixing of two or more gases, make the flow path of the fluid in the mixing tube more stable, reduce turbulence and eddy currents, and thus improve the mixing effect. By setting the ratio of the length to the tube diameter L / D of the mixing tube to 5-10, the length to tube diameter ratio within this range can effectively achieve full mixing of ammonia and nitrogen oxides, improve the reaction efficiency, thereby improving the denitration rate, and avoid uneven mixing caused by an excessively long or short static mixer length to tube diameter ratio, which affects the reaction effect. By rotating the stainless steel material, corrosion damage to the catalyst can be avoided, thereby extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure provided by an embodiment of the utility model;

[0016] Figure 2 It is a schematic diagram of the connection structure of several mixing units provided in an embodiment of the utility model;

[0017] Figure 3 It is a schematic diagram of the structure of a single mixing unit provided in an embodiment of the utility model;

[0018] Figure 4 It is an exploded view of a local structure provided by an embodiment of the utility model;

[0019] Figure 5It is a left view of the overall structure provided by an embodiment of the utility model.

[0020] Explanation of markings in the figure: 1. mixing tube; 2. mixing unit; 3. horizontal bar; 4. first connecting flange; 5. first sealing ring; 6. flow guide tube; 7. second connecting flange; 8. second sealing ring; 9. mounting hole. DETAILED DESCRIPTION

[0021] The present invention will now be further described in detail in conjunction with the accompanying drawings and preferred embodiments. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0022] like Figures 1 to 5 As shown, the X-shaped static mixer of the selective catalytic reduction denitrification system provided by the utility model includes a mixing tube 1, which is arranged in the mixing zone inside the flue. The inner cavity of the mixing tube 1 is provided with a plurality of mixing units 2, which are connected together by welding. The mixing unit 2 is composed of a plurality of crossed horizontal bars 3 according to a certain rule, and the plurality of horizontal bars 3 are connected together by welding. The left and right ends of the mixing tube 1 are fixedly connected with a first connecting flange 4, and a first sealing ring 5 is movably installed on the surface of the first connecting flange 4.

[0023] refer to Figure 2 , Figure 3 and Figure 4 The top of the mixing tube 1 is fixedly connected with a guide tube 6, the top of the guide tube 6 is fixedly connected with a second connecting flange 7, the surface of the second connecting flange 7 is fixedly and movably mounted with a second sealing ring 8, and the mixing unit 2 is cylindrical as a whole.

[0024] By adopting the above scheme: through the setting of the guide tube 6, the fluid can be guided to flow into the mixing tube 1 at a specific speed and direction to ensure uniform mixing of two or more gases, making the flow path of the fluid in the mixing tube 1 more stable, reducing turbulence and eddy currents, thereby improving the mixing effect.

[0025] refer to Figure 4 and Figure 5 A plurality of mounting holes 9 are provided on the surfaces of the first connecting flange 4 and the second connecting flange 7. The ratio L / D of the length to the diameter of the mixing tube 1 is 5-10, and the material of the mixing tube 1 is stainless steel.

[0026] The above scheme is adopted: by setting the ratio L / D of the length of the mixing tube 1 to the tube diameter to 5-10, the length to tube diameter ratio within this range can effectively achieve full mixing of ammonia and nitrogen oxides, improve the reaction efficiency, thereby improving the denitrification rate, avoid uneven mixing caused by too long or too short static mixer length to tube diameter ratio, affect the reaction effect, and avoid corrosion damage to the catalyst by rotating the stainless steel material, thereby extending the service life of the equipment.

[0027] Working principle:

[0028] When in use, the mixer is installed in the mixing area inside the flue through the first connecting flange 4 and the first sealing ring 5. The fluid enters the mixing tube 1 and is guided by the mixing unit 2 to continuously change the flow direction, so that the fluid is evenly mixed in the mixing tube 1, promoting the reaction between ammonia and nitrogen oxides, and ultimately improving the denitrification efficiency of the SCR denitrification system.

[0029] In summary: the X-shaped static mixer of the selective catalytic reduction denitration system, through the coordinated use of the mixing tube 1, the mixing unit 2 and the guide tube 6, solves the problem that there are few studies on the market analyzing the mixing effects of different structural elements of the SMX type static mixing element on the reducing agent and flue gas at the inlet flue of the SCR denitration system, the cost is high, and it is difficult for researchers to determine the optimal position of the SMX type static mixing element from the inlet of the catalyst layer, which is not conducive to people's in-depth research on the static mixer in the SCR denitration reduction system.

[0030] 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 variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes 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;

[0031] 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 the scope of the present invention is defined by the appended claims and their equivalents;

[0032] The above description only describes the specific implementation methods of the utility model. Various examples do not limit the essential content of the utility model. Ordinary technicians in the relevant technical field can modify or deform the specific implementation methods described above after reading the description without departing from the essence and scope of the utility model.

Claims

1. An X-shaped static mixer for a selective catalytic reduction denitration system, comprising a mixing tube (1), characterized in that: The mixing tube (1) is arranged in a mixing zone inside a flue, the inner cavity of the mixing tube (1) is provided with a plurality of mixing units (2), the plurality of mixing units (2) are connected together by welding, the mixing unit (2) is composed of a plurality of crossed horizontal bars (3) arranged in a certain pattern, the plurality of horizontal bars (3) are connected together by welding, the left and right ends of the mixing tube (1) are fixedly connected with a first connecting flange (4), and a first sealing ring (5) is movably mounted on the surface of the first connecting flange (4).

2. The X-shaped static mixer of the selective catalytic reduction denitration system according to claim 1, characterized in that: The top of the mixing tube (1) is fixedly connected to a flow guide tube (6), and the top of the flow guide tube (6) is fixedly connected to a second connecting flange (7).

3. The X-shaped static mixer of the selective catalytic reduction denitration system according to claim 2, characterized in that: A second sealing ring (8) is fixedly and movably mounted on the surface of the second connecting flange (7).

4. The X-shaped static mixer of the selective catalytic reduction denitration system according to claim 1, characterized in that: The mixing unit (2) is cylindrical as a whole.

5. The X-shaped static mixer of the selective catalytic reduction denitration system according to claim 1, characterized in that: A plurality of mounting holes (9) are provided on the surfaces of the first connecting flange (4) and the second connecting flange (7).

6. The X-shaped static mixer of the selective catalytic reduction denitration system according to claim 1, characterized in that: The ratio L / D of the length to the diameter of the mixing tube (1) is 5-10.

7. The X-shaped static mixer of the selective catalytic reduction denitration system according to claim 1, characterized in that: The material of the mixing tube (1) is stainless steel.

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