Diversion purification system and method for high-speed waste gas

Abstract

The invention discloses a diversion and purification system and method for high-speed waste gas, belongs to the technical field of waste gas treatment, and aims to solve the problem of poor waste gas treatment effect caused by short action time of high-speed waste gas discharged by an aero-engine test bed and a catalyst in the prior art. The flow guide purification system comprises a purification cylinder, a purification assembly and a flow guide cone, the purification assembly is arranged on the side wall of the purification cylinder; an inner cavity of the purification cylinder communicates with the external environment through pores of the purification assembly; one end of the purification cylinder is an open end, and the other end is a closed end; the flow guide cone is arranged in the purification barrel and fixedly connected with the closed end, and the tip end of the flow guide cone faces the open end of the purification barrel. The device can be used for diversion purification of high-speed waste gas.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of waste gas treatment, and particularly relates to a flow guide purification system and method for high-speed waste gas. BACKGROUND

[0002] In the operation process of an aero-engine test bench, high-speed flowing waste gas is generated. During the emission process, due to the extremely high flow rate, the waste gas often presents a strong jet state. Specifically, the flow rate of the waste gas is large (up to 100 m / s to 200 m / s), so that the contact time of the waste gas with the catalyst is particularly short when passing through the treatment system. This short contact time directly affects the chemical reaction time between the waste gas and the catalyst, resulting in that the catalyst cannot fully react with the harmful components in the waste gas.

[0003] Under this condition, the effect of waste gas treatment is naturally difficult to achieve the ideal state, and the treated waste gas may still contain a high concentration of pollutants, significantly reducing the comprehensive effect of waste gas treatment. SUMMARY

[0004] In view of the above analysis, the embodiments of the present application aim to provide a flow guide purification system and method for high-speed waste gas, to solve the problem that the high-speed waste gas emitted by the aero-engine test bench has a short reaction time with the catalyst, resulting in poor waste gas treatment effect.

[0005] The present application provides a flow guide purification system for high-speed waste gas, comprising a purification cylinder, a purification assembly and a flow guide cone;

[0006] The purification assembly is arranged on the side wall of the purification cylinder, and the inner cavity of the purification cylinder is in communication with the external environment through the apertures of the purification assembly;

[0007] One end of the purification cylinder is an open end, and the other end is a closed end;

[0008] The flow guide cone is arranged in the purification cylinder and is fixedly connected with the closed end, and the tip of the flow guide cone faces the open end of the purification cylinder.

[0009] Further, the shape of the purification cylinder is cylindrical, and the shape of the flow guide cone is conical.

[0010] Further, the purification cylinder comprises an inner mesh cylinder and an outer mesh cylinder, and a containing cavity is formed between the inner mesh cylinder and the outer mesh cylinder, and the purification assembly is arranged in the containing cavity.

[0011] Further, the shape of the purification cylinder is a polygonal prism, and the shape of the flow guide cone is a polygonal pyramid.

[0012] Further, the number of edges of the purification cylinder is equal to the number of edges of the flow guide cone, and the side surface of the purification cylinder corresponds to the side surface of the flow guide cone one by one.

[0013] Further, the side of the purification cylinder is provided with a containing hole, and the purification assembly is located in the containing hole and detachably connected with the containing hole.

[0014] Further, the purification assembly comprises a first catalyst layer and a second catalyst layer which are stacked.

[0015] Further, the first catalyst layer is a selective catalytic reduction denitration catalyst.

[0016] The second catalyst layer is a noble metal catalyst.

[0017] Further, the inner cavity of the purification cylinder is divided into a plurality of straight cylinder sections which are sequentially connected along the flow direction of the exhaust gas.

[0018] The application also provides a flow guiding and purifying method for high-speed exhaust gas, which adopts the flow guiding and purifying system.

[0019] Compared with the prior art, the application can achieve at least one of the following beneficial effects:

[0020] A) The flow guiding and purifying system for high-speed exhaust gas provided by the application can effectively change the flow direction of the high-speed exhaust gas by arranging the flow guiding cone body, significantly reduce the flow speed of the exhaust gas in the purification cylinder, effectively prolong the contact time of the exhaust gas with the purification assembly, improve the chemical reaction efficiency of the exhaust gas and the catalyst in the purification assembly, ensure that the harmful components in the exhaust gas can be fully treated and purified, and further significantly improve the purification effect and efficiency of the exhaust gas.

[0021] B) The flow guiding and purifying system for high-speed exhaust gas provided by the application has small floor area, is convenient to install and maintain, has high practicability and economy, and can meet the strict requirements of the high-speed exhaust gas purification in places such as the aero-engine test bed.

[0022] In the application, the above technical solutions can be combined with each other to realize more preferred combination solutions. Other features and advantages of the application will be described in the subsequent description, and some advantages will become apparent from the description or be understood by implementing the application. The purposes and other advantages of the application can be realized and obtained from the contents specifically indicated in the description and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings are only used for the purpose of illustrating specific embodiments and are not considered as limiting the application, and in the whole drawings, the same reference signs represent the same parts.

[0024] Figure 1 The first structure schematic view of the flow guiding and purifying system for high-speed exhaust gas provided by the embodiment one of the application;

[0025] Figure 2This is a schematic diagram of a second structure of the high-speed exhaust gas guiding and purification system provided in Embodiment 1 of the present invention;

[0026] Figure 3 This is a schematic diagram of the structure of the high-speed exhaust gas guiding and purification system provided in Embodiment 2 of the present invention;

[0027] Figure 4 This is a flowchart of a method for guiding and purifying high-speed exhaust gas provided in Embodiment 3 of the present invention.

[0028] Figure label:

[0029] 1-Internal air intake pipe; 2-Air intake bend; 3-Purification component; 4-Expansion and deceleration section; 5-Guide cone; 6-First straight section; 7-Second straight section; 8-Third straight section; 9-First guide ring; 10-Second guide ring; 11-Connecting pipe; 12-Surrounding connecting rod; 13-External air intake pipe; 14-Exhaust gas detection component. Detailed Implementation

[0030] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0031] Example 1

[0032] This embodiment provides a flow guiding and purification system for high-speed exhaust gas. See [link to documentation]. Figures 1 to 2 It includes a purification cylinder 2, a purification component 3, and a guide cone 5. The purification component 3 is located on the side wall of the purification cylinder 2. The inner cavity of the purification cylinder 2 is connected to the external environment through the pores of the purification component 3. One end of the purification cylinder 2 is an open end, which serves as an air inlet, and the other end is a closed end. The guide cone 5 is located inside the purification cylinder 2 and is fixedly connected to the closed end. The tip of the guide cone 5 faces the open end of the purification cylinder 2.

[0033] In practical applications, when the exhaust gas enters the purification cylinder 2 at a high flow rate (e.g., 100m / s to 200m / s), it will flow directly and quickly to the guide cone 5. During the contact with the guide cone 5, the exhaust gas will change direction and disperse and flow in the opposite direction under the action of the guide cone 5. At the same time, the flow rate of the exhaust gas will be greatly reduced, so that it can flow evenly through the surrounding purification components 3 and fully contact the catalyst in the purification components 3.

[0034] Compared with the prior art, the flow guide purification system for high-speed exhaust gas provided by the embodiment can effectively change the flow direction of high-speed exhaust gas, significantly reduce the flow rate of the exhaust gas in the purification cylinder 2, effectively prolong the contact time of the exhaust gas with the purification assembly 3, improve the chemical reaction efficiency of the exhaust gas and the catalyst in the purification assembly 3, ensure that the harmful components in the exhaust gas can be fully treated and purified, and further significantly improve the purification effect and efficiency of the exhaust gas.

[0035] In addition, the flow guide purification system for high-speed exhaust gas has a compact structure, a small footprint, and is convenient to install and maintain, and has high practicability and economy, and can meet the strict requirements of the aero-engine test bed and the like for high-speed exhaust gas purification.

[0036] The shapes of the purification cylinder 2 and the flow guide cone 5 can adopt the following two modes:

[0037] One mode is that the purification cylinder 2 is in the shape of a cylinder, and correspondingly, the flow guide cone 5 is in the shape of a cone, as shown in Figure 1 .

[0038] In this structure, the purification cylinder 2 is in a sandwich structure, including an inner mesh cylinder and an outer mesh cylinder, and a containing cavity is formed between the inner mesh cylinder and the outer mesh cylinder, and the purification assembly 3 is arranged in the containing cavity, that is, the inner mesh cylinder, the purification assembly 3 and the outer mesh cylinder are sequentially sleeved from inside to outside. In this way, the purification assembly 3 is stably clamped between the inner mesh cylinder and the outer mesh cylinder, which can not only ensure the stability of the purification assembly 3, but also facilitate the installation and replacement of the purification assembly 3. Moreover, the sandwich structure design can also enhance the overall strength of the purification cylinder 2 to a certain extent, so that it can better withstand the impact force generated when the high-speed exhaust gas flows, and prolong the service life of the purification cylinder 2.

[0039] Another mode is that the purification cylinder 2 is in the shape of a polygonal prism, and correspondingly, the flow guide cone 5 is in the shape of a polygonal pyramid, as shown in Figure 2 .

[0040] It should be noted that the number of edges of the purification cylinder 2 is equal to the number of edges of the flow guide cone 5, and the side surfaces of the purification cylinder 2 correspond one by one to the side surfaces of the flow guide cone 5.

[0041] In this structure, the side surface of the purification cylinder 2 is provided with a containing hole, and the purification assembly 3 is located in the containing hole and detachably connected with the containing hole, which can greatly increase the installation area of the purification assembly 3, and further improve the treatment efficiency of the exhaust gas. The polygonal cylinder body enables the exhaust gas to more fully contact the purification assembly 3 when flowing through the treatment section, ensuring that the catalytic reaction is carried out completely.

[0042] In view of the fact that the exhaust gas mainly contains VOCs and NOx, in order to achieve purification of the above two pollutants, the structure of the purification assembly 3, specifically, is a double-layer structure, including a first catalyst layer and a second catalyst layer stacked together.

[0043] The first catalyst layer is an SCR catalyst (selective catalytic reduction denitrification),

[0044] The second catalyst layer is a noble metal catalyst, and the noble metal catalyst is exemplarily a platinum-palladium noble metal catalyst.

[0045] In order to further improve the purification effect of the exhaust gas, the inner cavity of the purification cylinder 2 is divided into a plurality of straight cylinder sections connected in sequence along the flow direction of the exhaust gas.

[0046] Exemplarily, the number of straight cylinder sections is three, that is, the inner cavity of the purification cylinder 2 is divided into a first straight cylinder section 6, a second straight cylinder section 7 and a third straight cylinder section 8 connected in sequence along the flow direction of the exhaust gas.

[0047] It should be noted that along the direction gradually away from the inlet end of the inner cavity of the purification cylinder 2, the opening rate of the purification assembly 3 in the first straight cylinder section 6 > the opening rate of the purification assembly 3 in the second straight cylinder section 7 > the opening rate of the purification assembly 3 in the third straight cylinder section 8, and the pore diameter of the purification assembly 3 in the first straight cylinder section 6 > the pore diameter of the purification assembly 3 in the second straight cylinder section 7 > the pore diameter of the purification assembly 3 in the third straight cylinder section 8.

[0048] This is because, due to the arrangement of the flow guide cone 5, the exhaust gas will preferentially flow out from the purification assembly 3 of the third straight cylinder section 8, but as the exhaust gas flows reversely, the flow rate of the exhaust gas will gradually decrease, and in the present embodiment, by arranging the purification assembly 3 with different opening rates, the contact of the exhaust gas with the catalyst in different straight cylinder sections can be more sufficient and uniform.

[0049] Specifically, the opening rate of the purification assembly 3 in the third straight cylinder section 8 is small, which can ensure that the exhaust gas has sufficient contact time with the catalyst when the flow rate is high; while the opening rate of the purification assembly 3 in the first straight cylinder section 6 is large, because after the flow rate of the exhaust gas decreases, the purification assembly 3 with a larger opening rate still maintains a high treatment efficiency, avoiding the decrease of treatment effect due to too low flow rate. By adopting the above segmented design with different opening rates and pore diameters, the flow purification system can dynamically adjust the contact of the exhaust gas with the catalyst according to the change of the flow rate of the exhaust gas, thereby further improving the purification effect of the exhaust gas.

[0050] In addition, in order to further optimize the flow and purification process of the exhaust gas, the flow and purification system for high-speed exhaust gas further comprises a diameter expansion and speed reduction section 4 arranged at the gas inlet of the purification cylinder 2, the inner diameter of the gas inlet end of the diameter expansion and speed reduction section 4 is smaller than the inner diameter of the gas outlet end of the diameter expansion and speed reduction section 4. In this way, the exhaust gas can first pass through an expanded channel before entering the purification cylinder 2, further reducing the flow rate of the exhaust gas and making the exhaust gas more evenly enter the purification cylinder 2.

[0051] In order to further guide the flow of exhaust gas and optimize the flow state of exhaust gas in the inner cavity of the purification cylinder 2, the flow and purification system further comprises a plurality of flow guide rings arranged in the inner cavity of the purification cylinder 2, the plurality of flow guide rings are arranged along the axial direction of the inner cavity of the purification cylinder 2, the inner diameter and the outer diameter of the flow guide rings gradually decrease along the direction away from the gas inlet end of the inner cavity of the purification cylinder 2, and there is a gap between the flow guide ring and the inner wall of the inner cavity of the purification cylinder 2.

[0052] In actual application, when the exhaust gas enters the inner cavity of the purification cylinder 2 from the gas inlet end, it will flow through the plurality of flow guide rings in sequence. Since the inner diameter and the outer diameter of the flow guide ring gradually decrease, the gradual change structure can gradually control the flow rate and flow direction of the exhaust gas during the flow process of the exhaust gas.

[0053] In addition, the moderate gap between the flow guide ring and the inner wall of the inner cavity of the purification cylinder 2 can effectively avoid excessive obstruction of the flow guide ring to the flow of the exhaust gas, thereby ensuring that the exhaust gas can smoothly pass through this area.

[0054] As to the structure of the flow guide ring, specifically, it comprises a front inner concave ring and a rear inner concave ring, the front inner concave ring and the rear inner concave ring are symmetrically arranged and fixedly connected, and in actual application, they can be integrally formed. In this way, the flow guide ring can play a flow guiding role in the flow process of the exhaust gas through the arrangement of the front inner concave ring and the rear inner concave ring. This structure not only can enhance the flow and purification effect of the exhaust gas, but also can improve the contact efficiency of the exhaust gas and the purification assembly 3, thereby further improving the purification effect of the exhaust gas.

[0055] Exemplarily, the number of flow guide rings is two, i.e. a first flow guide ring 9 and a second flow guide ring 10, the first flow guide ring 9 is located in the first straight cylinder section 6, the second flow guide ring 10 is located in the second straight cylinder section 7, the inner diameter of the second flow guide ring 10 is smaller than that of the first flow guide ring 9, and the outer diameter of the second flow guide ring 10 is smaller than that of the first flow guide ring 9.

[0056] Based on the structure and number of the flow guide ring and the arrangement position of the flow guide ring, in the flow and purification system for high-speed exhaust gas of the embodiment, the flow process of the exhaust gas is as follows:

[0057] When the exhaust gas enters the inner cavity of the purification cylinder 2 from the air inlet end, the first part of the exhaust gas contacts the first flow guide ring 9, and under the guidance of the front inner concave ring in the first flow guide ring 9, the first part of the exhaust gas diffuses to the four directions and flows through the first straight cylinder segment 6, contacts the catalyst in the first straight cylinder segment 6, and purifies the first part of the exhaust gas;

[0058] The remaining exhaust gas continues to flow forward, and since the inner diameter and the outer diameter of the second flow guide ring 10 are smaller than the inner diameter and the outer diameter of the first flow guide ring 9, the second part of the exhaust gas contacts the front inner concave ring in the second flow guide ring 10, and under the guidance of the front inner concave ring in the second flow guide ring 10, the second part of the exhaust gas diffuses to the four directions and flows through the second straight cylinder segment 7, contacts the catalyst in the second straight cylinder segment 7, and purifies the second part of the exhaust gas;

[0059] The remaining exhaust gas continues to flow forward, contacts the flow guide cone 5, and under the guidance of the flow guide cone 5, the remaining exhaust gas diffuses to the four directions, wherein the third part of the exhaust gas flows through the third straight cylinder segment 8, contacts the catalyst in the third straight cylinder segment 8, and purifies the third part of the exhaust gas, and at the same time, the remaining exhaust gas flows reversely;

[0060] The fourth part of the exhaust gas contacts the second flow guide ring 10, and under the guidance of the rear inner concave ring in the second flow guide ring 10, the fourth part of the exhaust gas diffuses to the four directions and flows through the second straight cylinder segment 7, contacts the catalyst in the second straight cylinder segment 7, and purifies the fourth part of the exhaust gas;

[0061] The fifth part of the exhaust gas continues to flow forward, contacts the first flow guide ring 9, and under the guidance of the rear inner concave ring in the first flow guide ring 9, the fifth part of the exhaust gas diffuses to the four directions and flows through the first straight cylinder segment 6, contacts the catalyst in the first straight cylinder segment 7, and purifies the fifth part of the exhaust gas.

[0062] As can be seen from the above exhaust gas flow process, the flow guide purification system for high-speed exhaust gas of the embodiment can realize multiple splitting and guiding of the exhaust gas in the purification cylinder 2 through the cooperation of the flow guide ring and the flow guide cone 5, which not only prolongs the contact time of the exhaust gas and the catalyst, but also makes the exhaust gas flow more uniformly through the purification assemblies 3 of each straight cylinder segment, thereby significantly improving the purification efficiency of VOCs and NOx and other pollutants in the exhaust gas.

[0063] In order to facilitate the installation and maintenance of the flow guide ring, the above-mentioned flow guide purification system further comprises a connecting assembly, and the flow guide ring is erected in the inner cavity of the purification cylinder 2 through the connecting assembly.

[0064] Specifically, the connecting assembly comprises a connecting rod 12, one end of the connecting rod 12 is fixedly connected with the inner wall of the purification cylinder 2, and the other end of the connecting rod 12 is fixedly connected with the flow guide ring. Exemplarily, the number of the connecting rods 12 is multiple, and the multiple connecting rods 12 are evenly arranged along the circumference of the purification cylinder 2. Through this arrangement mode, the connecting rod 12 reliably connects the flow guide ring with the purification cylinder 2, thereby ensuring the stability of the position of the flow guide ring in the inner cavity of the purification cylinder 2.

[0065] In addition, the multiple connecting rods 12 are evenly arranged along the circumference of the purification cylinder 2, so that the flow guide ring is uniformly stressed, and is not easy to be deformed or displaced under long-term scouring of the exhaust gas, thereby ensuring the stability and effectiveness of the flow guiding effect of the flow guide ring on the exhaust gas, and further facilitating the continuous and efficient operation of the entire flow guiding and purifying system.

[0066] Embodiment two

[0067] The flow guiding and purifying system for high-speed exhaust gas provided in the embodiment is basically the same as the flow guiding and purifying system for high-speed exhaust gas provided in embodiment one, and the difference lies in that:

[0068] The flow guiding and purifying system of the embodiment further comprises an air guide joint and an exhaust gas detection assembly 14, see Figure 3 The air guide joint comprises an internal air guide pipe 1, a connecting pipe 11 and an external air guide pipe 13, wherein the internal air guide pipe 1 is located in the injection cylinder of the aero-engine test bed, one end of the connecting pipe 11 penetrates through the side wall of the injection cylinder and is fixedly connected with the internal air guide pipe 1, the other end of the connecting pipe 11 is connected with one end of the external air guide pipe 13, and the other end of the external air guide pipe 13 is sequentially connected with the exhaust gas detection assembly 14 and the purification cylinder 2.

[0069] Compared with the prior art, the flow guiding and purifying system for high-speed exhaust gas provided in the embodiment can flexibly adjust the exhaust gas extraction position through the arrangement of the internal air guide pipe 1 and the external air guide pipe 13, thereby avoiding the deviation caused by sampling only near the wall surface of the injection cylinder, and more accurately reflecting the real exhaust gas condition in the injection cylinder of the aero-engine test bed.

[0070] On the other hand, through the sequential connection of the exhaust gas detection assembly 14 and the purification cylinder 2, the real-time detection of the exhaust gas can be realized while the exhaust gas is being purified, so that not only can the content change of various pollutants in the exhaust gas be grasped in real time to provide data support for the subsequent adjustment of the purification process, but also the possible problems of the purification system, such as catalyst failure and blockage of the purification assembly 3, can be found in time, and then targeted maintenance measures can be taken to ensure that the flow guiding and purifying system is always in a good operating state, thereby ensuring the efficient purification of VOCs and other pollutants in high-speed exhaust gas.

[0071] In order to be able to introduce the exhaust gas smoothly into the internal air guide pipe 1, the above-mentioned air guide joint further comprises an air guide elbow 2, one end of which is fixedly connected with the internal air guide pipe 1, and the other end is arranged in the axial direction of the air guide cylinder and faces the inflow direction of the exhaust gas. Exemplarily, the internal air guide pipe 1 is arranged in the radial direction of the air guide cylinder, and the bending angle of the elbow is 90°. In this way, through the arrangement of the air guide elbow 2, the exhaust gas can flow more smoothly into the internal air guide pipe 1 along the axial direction of the air guide cylinder, avoiding the turbulence and backflow phenomenon of the exhaust gas during the entering process, thereby ensuring the smoothness and continuity of the exhaust gas extraction. The special design of the air guide elbow 2 makes it better adapt to the air flow environment in the air guide cylinder, efficiently and accurately guiding the exhaust gas into the internal air guide pipe 1, providing a stable and reliable gas sample for the subsequent detection work.

[0072] Embodiment three

[0073] The embodiment provides a flow guide purification method for high-speed exhaust gas, which adopts the flow guide purification system for high-speed exhaust gas provided in the embodiment one or the embodiment two, and the flow guide purification method comprises the following steps. Figure 4

[0074] Step 1: After the exhaust gas enters the inner cavity of the purification cylinder 2 from the air inlet end, the first part of the exhaust gas contacts the first flow guide ring 9, and under the guidance of the front inner concave ring in the first flow guide ring 9, the first part of the exhaust gas diffuses to the four directions and flows through the first straight cylinder segment 6, contacts the catalyst in the first straight cylinder segment 6, and performs purification treatment on the first part of the exhaust gas;

[0075] Step 2: The remaining exhaust gas continues to flow forward, and the second part of the exhaust gas contacts the second flow guide ring 10, and under the guidance of the front inner concave ring in the second flow guide ring 10, the second part of the exhaust gas diffuses to the four directions and flows through the second straight cylinder segment 7, contacts the catalyst in the second straight cylinder segment 7, and performs purification treatment on the second part of the exhaust gas;

[0076] Step 3: The remaining exhaust gas continues to flow forward and contacts the flow guide cone 5, and under the guidance of the flow guide cone 5, the remaining exhaust gas diffuses to the four directions, wherein the third part of the exhaust gas flows through the third straight cylinder segment 8, contacts the catalyst in the third straight cylinder segment 8, and performs purification treatment on the third part of the exhaust gas, and at the same time, the remaining exhaust gas flows reversely;

[0077] Step 4: The fourth part of the exhaust gas contacts the second flow guide ring 10, and under the guidance of the rear inner concave ring in the second flow guide ring 10, the fourth part of the exhaust gas diffuses to the four directions and flows through the second straight cylinder segment 7, contacts the catalyst in the second straight cylinder segment 7, and performs purification treatment on the fourth part of the exhaust gas;

[0078] ​Step 5: The fifth part of the exhaust gas continues to flow forward and contacts the first guide ring 9, and under the guidance of the inner concave ring of the first guide ring 9, the fifth part of the exhaust gas diffuses outward and flows through the first straight cylinder segment 6, and contacts the catalyst of the first straight cylinder segment 7 to purify the fifth part of the exhaust gas.

[0079] Compared with the prior art, the beneficial effects of the method for guiding and purifying high-speed exhaust gas provided by the embodiment are basically the same as those of the system for guiding and purifying high-speed exhaust gas provided by the first embodiment, and are not described here.

[0080] The above describes only the preferred specific embodiments of the present application, but the protection scope of the present application is not limited to this. Any changes or replacements within the technical range disclosed by the present application can be easily thought of by those skilled in the art, and should be covered within the protection scope of the present application.

Claims

1. A flow guiding purification system for high velocity exhaust gas, characterized in that The purification system comprises a purification cylinder, a purification assembly and a flow guide cone body. The purification assembly is arranged on the side wall of the purification cylinder, and the inner cavity of the purification cylinder is communicated with the external environment through the aperture of the purification assembly. One end of the purification cylinder is an open end, and the other end is a closed end. The flow guide cone body is arranged in the purification cylinder and fixedly connected with the closed end, and the tip of the flow guide cone body is directed to the open end of the purification cylinder.

2. The flow guiding purification system for high speed exhaust gas according to claim 1, characterized by, The purification cylinder is in a cylindrical shape, and the flow guide cone body is in a conical shape.

3. The flow guiding purification system for high speed exhaust gas according to claim 2, characterized by, The purification cylinder comprises an inner mesh cylinder and an outer mesh cylinder, and a containing cavity is arranged between the inner mesh cylinder and the outer mesh cylinder.

4. The flow guiding purification system for high speed exhaust gas according to claim 1, characterized by, The purification cylinder is in a multi-prism shape, and the flow guide cone body is in a multi-prism pyramid shape.

5. The flow guiding purification system for high speed exhaust gas according to claim 4, characterized by The number of edges of the purification cylinder is equal to the number of edges of the flow guide cone body, and the side surface of the purification cylinder corresponds to the side surface of the flow guide cone body one by one.

6. The flow guiding purification system for high speed exhaust gas according to claim 5, characterized by The side surface of the purification cylinder is provided with a containing hole, and the purification assembly is arranged in the containing hole and detachably connected with the containing hole.

7. The flow guiding purification system for high speed exhaust gas according to claim 1, characterized by The purification assembly comprises a first catalyst layer and a second catalyst layer which are stacked.

8. The flow guiding purification system for high speed exhaust gas according to claim 7, characterized by The first catalyst layer is a selective catalytic reduction denitration catalyst. The second catalyst layer is a noble metal catalyst.

9. The flow guiding purification system for high speed exhaust gases according to claim 1, characterized in that, The inner cavity of the purification cylinder is divided into a plurality of straight cylinder sections which are connected in sequence along the flow direction of the exhaust gas.

10. A method for the purification of high velocity exhaust gas, characterized in that, The flow guide purification system according to any one of claims 1 to 9 is adopted.

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