Venturi tube, ceramic fiber filter tube and flue gas dust removal device

Abstract

The utility model discloses a venturi tube, ceramic fiber filter tube and flue gas dust removal device, relates to flue gas treatment technical field, venturi tube includes inlet section, contraction section, throat part and diffusion section that connect in proper order along the length direction, diffusion section far away from throat part end is connected with steady flow section, steady flow section along the length direction inner diameter keeps consistent; according to the Venturi tube provided by the technical scheme of the utility model, the flow stabilizing section is arranged behind the diffusion section to provide an area for stabilizing gas flow, and the flow direction of compressed gas is corrected after the compressed gas is rebounded twice on the inner wall of the Venturi tube, so that the pressure and the flow speed of the gas are reduced, the damage to the ceramic fiber filter tube is reduced, and the service life of the ceramic fiber filter tube is prolonged. The pipe breakage rate of the blowing far end is greatly reduced, the working stability of the ceramic fiber filter pipe is guaranteed, and the service life of the ceramic fiber filter pipe is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas treatment, in particular to a venturi tube, a ceramic fiber filter tube and a flue gas dust removal device. Background Art

[0002] Ceramic fiber filter tubes are a type of flue gas treatment equipment that combines dust removal and denitrification. Made of micron-sized fibers, the intricate fiber structure within the ceramic fiber filter tube effectively traps dust on the filter surface, allowing clean flue gas to pass through the filter tube and be discharged into the atmosphere. Dust on the filter surface is cleaned by pulse jets and collected in the dust collector hopper for external discharge. Furthermore, the filter tube itself is impregnated with a vanadium-titanium catalyst, enabling it to also perform denitrification. As ceramic fiber filter tubes are gradually applied to flue gas treatment in industries such as glass, coking, and biomass power generation, their operational stability, service life, and tube breakage rate are receiving increasing attention.

[0003] Existing ceramic fiber filter tubes mostly use compressed air pulse blowing. After the pulse valve is opened, the compressed air in the air bag enters the blowpipe through the pulse valve, and then a row of nozzles below the blowpipe sprays each filter tube separately. The compressed air ejected from the nozzle first passes through the Venturi tube above the filter tube, where the gas flow rate, pressure, and direction are adjusted before entering the filter tube to form a spray. After the compressed air enters the blowpipe, the airflow becomes uneven, resulting in a large impact on the ceramic fiber filter tube. In addition, after the high-temperature flue gas is introduced into the ceramic filter tube dust collector, it expands and deforms due to the heat, causing the blowpipe to be slightly misaligned, resulting in misaligned and uneven spraying. This will further increase the impact of the distal nozzle on the inner wall of the ceramic fiber filter tube, affecting the service life of the ceramic fiber filter tube. Utility Model Content

[0004] The main purpose of the utility model is to provide a venturi tube, a ceramic fiber filter tube and a flue gas dust removal device, aiming to reduce the impact of compressed gas on the ceramic fiber filter tube and extend the service life of the ceramic fiber.

[0005] To achieve the above-mentioned purpose, the Venturi tube proposed in the present invention includes an inlet section, a contraction section, a throat and a diffusion section connected in sequence along the length direction. The diffusion section is connected to a flow stabilization section at one end away from the throat, and the inner diameter of the flow stabilization section remains consistent along the length direction.

[0006] In one embodiment, the diameters of the flow stabilizing section and the diffusion section at one end close to the flow stabilizing section are equal.

[0007] In one embodiment, the length of the flow stabilization section is A, 10 cm ≤ A ≤ 20 cm.

[0008] In one embodiment, the length of the flow stabilization section is 10 cm.

[0009] In one embodiment, a transition fillet is provided at the connection between the diffusion section and the flow stabilization section.

[0010] In one embodiment, the venturi tube is made of one of ceramic, cast iron and stainless steel.

[0011] In one embodiment, the diffuser section and the flow stabilization section are an integrated structure.

[0012] In one embodiment, an installation portion is formed at one end of the inlet section away from the contraction section and extending radially outward.

[0013] The utility model also provides a ceramic fiber filter tube, which includes a venturi tube and a tube body. The venturi tube partially extends into the inner hole of the tube body, and the mounting portion overlaps the air inlet end of the tube body.

[0014] The venturi tube includes an inlet section, a contraction section, a throat and a diffusion section connected in sequence along the length direction. The diffusion section is connected to a flow stabilization section at one end away from the throat. The inner diameter of the flow stabilization section remains consistent along the length direction.

[0015] The utility model also provides a flue gas dust removal device, which includes the ceramic fiber filter tube mentioned above.

[0016] The technical solution of the present utility model proposes a venturi tube, including an inlet section, a contraction section, a throat, a diffusion section and a steady flow section. When the gas enters the contraction section from the inlet section, its speed increases, resulting in a decrease in pressure, thereby forming a negative pressure area in the throat, which helps to capture particulate matter in the gas. By setting a steady flow section after the diffusion section to provide an area for stable gas flow, the flow direction of the compressed gas after two rebounds on the inner wall of the venturi tube is corrected, so that the gas pressure and flow rate are reduced, the damage to the ceramic fiber filter tube is reduced, the pipe breakage rate at the far end of the injection is greatly reduced, the working stability of the ceramic fiber filter tube is ensured and its service life is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0018] Figure 1 This is a structural schematic diagram of an embodiment of a Venturi tube provided by the present invention.

[0019] Description of Figure Numbers:

[0020] 1000. Venturi tube; 1. Inlet section; 11. Mounting section; 2. Contraction section; 3. Throat; 4. Diffusion section; 5. Steady flow section.

[0021] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0023] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0024] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0025] Ceramic fiber filter tubes are a type of flue gas treatment equipment that combines dust removal and denitrification. Made of micron-sized fibers, the intricate fiber structure within the ceramic fiber filter tube effectively traps dust on the filter surface, allowing clean flue gas to pass through the filter tube and be discharged into the atmosphere. Dust on the filter surface is cleaned by pulse jets and collected in the dust collector hopper for external discharge. Furthermore, the filter tube itself is impregnated with a vanadium-titanium catalyst, enabling it to also perform denitrification. As ceramic fiber filter tubes are gradually applied to flue gas treatment in industries such as glass, coking, and biomass power generation, their operational stability, service life, and tube breakage rate are receiving increasing attention.

[0026] Existing ceramic fiber filter tubes mostly use compressed air pulse blowing. After the pulse valve is opened, the compressed air in the air bag enters the blowpipe through the pulse valve, and then a row of nozzles below the blowpipe sprays each filter tube separately. The compressed air ejected from the nozzle first passes through the Venturi tube above the filter tube, where the gas flow rate, pressure, and direction are adjusted before entering the filter tube to form a spray. After the compressed air enters the blowpipe, the airflow becomes uneven, resulting in a large impact on the ceramic fiber filter tube. In addition, after the high-temperature flue gas is introduced into the ceramic filter tube dust collector, it expands and deforms due to the heat, causing the blowpipe to be slightly misaligned, resulting in misaligned and uneven spraying. This will further increase the impact of the distal nozzle on the inner wall of the ceramic fiber filter tube, affecting the service life of the ceramic fiber filter tube.

[0027] To solve the above problems, please refer to Figure 1 The utility model proposes a venturi tube 1000, comprising an inlet section 1, a contraction section 2, a throat 3 and a diffusion section 4 connected in sequence along the length direction, the diffusion section 4 is connected to a flow stabilizing section 5 at one end away from the throat 3, and the inner diameter of the flow stabilizing section 5 remains consistent along the length direction.

[0028] The technical solution of the present invention proposes a venturi tube 1000, comprising an inlet section 1, a contraction section 2, a throat 3, a diffusion section 4 and a steady flow section 5. When the gas enters the contraction section 2 from the inlet section 1, its velocity increases, resulting in a decrease in pressure, thereby forming a negative pressure zone in the throat 3, which helps to capture particulate matter in the gas. By providing a region for stable gas flow after the diffusion section 4, the flow direction of the compressed gas is corrected after two rebounds on the inner wall of the venturi tube 1000, thereby reducing the gas pressure and flow rate, reducing damage to the ceramic fiber filter tube, greatly reducing the tube breakage rate at the far end of the injection, ensuring the working stability of the ceramic fiber filter tube and extending its service life.

[0029] In an optional embodiment, to ensure the stability of the compressed air in the venturi tube 1000, please refer to Figure 1 , the diameter of the steady flow section 5 is equal to that of the diffuser section 4 at one end thereof close to the steady flow section 5. The purpose of this design is to provide a smooth transition, reduce the resistance and turbulence of the fluid when it enters the steady flow section 5 from the diffuser section 4, and thus help maintain the stability of the fluid flow. In fluid dynamics, sudden changes in diameter can lead to drastic changes in fluid velocity and pressure, thereby generating turbulence and eddies. By making the diameter of the steady flow section 5 equal to that of the diffuser section 4, such sudden changes can be avoided and the instability of the compressed air after passing through the diffuser section 4 can be reduced. This smooth transition helps to reduce the scouring of the inner wall of the venturi tube 1000 by the fluid, thereby extending the service life of the equipment. At the same time, this also helps to reduce the energy loss of compressed air when passing through the venturi tube 1000, and improve the efficiency of the entire venturi tube 1000.

[0030] Optionally, the length of the stabilizing section 5 is A, 10cm≤A≤20cm. This design provides an appropriate stabilizing region, allowing the compressed air sufficient length to stabilize after leaving the diffuser section 4, reducing turbulence and eddies, thereby improving dust removal efficiency. The length of the stabilizing section 5 is crucial to ensuring fluid flow stability. If the length is too short, the compressed air may not be sufficiently stabilized, resulting in poor dust removal. If the length is too long, the overall size of the Venturi tube 1000 may increase, resulting in reduced space utilization efficiency. Therefore, by specifying the length range of the stabilizing section 5, it is possible to ensure efficient dust removal while maintaining the compactness of the equipment. This design also helps reduce energy loss within the stabilizing section 5, improving the energy efficiency of the entire system. In addition, by providing a standardized length, the Venturi tube 1000 can be more easily mass-produced and installed. By fixing the length of the stabilizing section 5, the performance of each Venturi tube 1000 is guaranteed to be consistent, facilitating performance testing and quality control. Furthermore, a standardized length helps simplify inventory management and logistics processes. In this embodiment, the length of the flow stabilizing section 5 is 15 cm. In other embodiments, the length of the flow stabilizing section 5 can be specifically selected according to the pressure of the compressed gas in the venturi tube 1000 and the diameter of the venturi tube 1000.

[0031] Furthermore, to ensure a smooth transition of the compressed air from the diffuser section 4 to the steady flow section 5, please refer to Figure 1 , a transition fillet is provided at the connection between the diffusion section 4 and the steady flow section 5. The purpose of setting the transition fillet is to reduce the resistance and turbulence during the fluid flow process by reducing the sharp edges of the connection, thereby improving the smoothness and stability of the fluid flow. The design of the transition fillet helps to reduce the energy loss of the fluid when passing through the diffusion section 4 and the steady flow section 5, and improve the efficiency of the venturi tube 1000. In addition, the fillet can also reduce the scouring of the fluid on the inner wall of the venturi tube 1000 and extend the service life of the equipment. In fluid dynamics, sharp edges can cause fluid separation and the generation of vortices, which will increase pressure loss and wear. By introducing a transition fillet, the flow path of the compressed air can be smoothed and these adverse effects can be reduced.

[0032] In an optional embodiment, to ensure the longevity of the Venturi tube 1000, the material of the Venturi tube 1000 is ceramic, cast iron, or stainless steel. Ceramic has excellent wear and corrosion resistance and is suitable for use in high-temperature and corrosive environments; cast iron is relatively low-cost and suitable for general industrial applications; and stainless steel has excellent strength and corrosion resistance. By offering a variety of material options, the Venturi tube 1000 can be adapted to meet the needs of different usage scenarios. This design flexibility helps expand the applicability of the Venturi tube 1000.

[0033] In an optional embodiment, to facilitate the production of the Venturi tube 1000, the diffuser section 4 and the flow stabilization section 5 are integrated. This integrated structure helps improve the overall strength and stability of the Venturi tube 1000 and reduces the risk of failure due to loose connections. Furthermore, the integrated structure helps reduce leakage and turbulence during fluid flow, thereby improving the performance of the Venturi tube 1000. During the manufacturing process, the integrated structure can reduce the need for welding or threaded connections, thereby reducing manufacturing complexity and cost. This helps improve the reliability of the Venturi tube 1000 and reduces potential leak points and maintenance requirements.

[0034] In an optional embodiment, to facilitate the installation of the venturi tube 1000, please refer to Figure 1 , one end of the inlet section 1 away from the contraction section 2 extends radially outward to form a mounting portion 11. The purpose of this design is to provide a structure that is easy to install, so that the venturi tube 1000 can be more easily connected to external equipment or pipelines. The design of the mounting portion 11 helps to simplify the installation process of the venturi tube 1000 and improves the convenience and reliability of installation. In addition, the mounting portion 11 can also serve as a supporting structure to enhance the stability of the venturi tube 1000. In actual applications, the mounting portion 11 can be designed to have a shape that matches the interface of the pipeline or equipment, thereby ensuring that the venturi tube 1000 can be seamlessly integrated into the entire system. It also helps to reduce potential errors during the installation process and improves the convenience and accuracy of the installation of the venturi tube 1000.

[0035] The present invention also provides a ceramic fiber filter tube comprising a tube body and a venturi tube 1000. The venturi tube 1000 partially extends into the inner bore of the tube body, and a mounting portion 11 overlaps the air inlet end of the tube body. The venturi tube 1000 and the tube body are combined to form a complete ceramic fiber filter tube system for filtering compressed air. Furthermore, the integration of the venturi tube 1000 and the tube body ensures efficient dust removal as the fluid passes through the filter tube. The design of the venturi tube 1000 helps accelerate fluid flow and improve dust removal efficiency, while the tube body provides structural support and protects the venturi tube 1000 from damage. Furthermore, the design of the mounting portion 11 allows the entire filter tube system to be easily installed in existing piping systems, enhancing system flexibility and compatibility. The specific structure of the venturi tube 1000 is similar to that of the aforementioned embodiments. Since the present ceramic fiber filter tube utilizes all the technical solutions of all the aforementioned embodiments, it at least possesses all the beneficial effects provided by the technical solutions of the aforementioned embodiments, which will not be further elaborated here.

[0036] The present invention also proposes a flue gas dust removal device, which includes a ceramic fiber filter tube. By using the ceramic fiber filter tube, the flue gas dust removal device can utilize the acceleration and deceleration effects of the venturi tube 1000 and the filtering effect of the ceramic fiber to achieve efficient removal of dust in the flue gas. This device is suitable for various industrial processes and helps to reduce air pollution and improve environmental quality. In addition, the design of the ceramic fiber filter tube also helps to reduce the maintenance requirements of the equipment because it can withstand high temperatures and corrosive environments, thereby extending the service life of the equipment. The specific structure of the ceramic fiber filter tube refers to the above-mentioned embodiment. Since the flue gas dust removal device adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0037] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A venturi tube for a ceramic fiber filter tube, having a fluid channel formed therein, characterized in that: The invention comprises an inlet section, a contraction section, a throat section and a diffusion section which are sequentially connected along the length direction. The diffusion section is connected to a flow stabilization section at one end away from the throat. The inner diameter of the flow stabilization section is kept consistent along the length direction.

2. The venturi tube according to claim 1, wherein: The diameters of the flow stabilizing section and the diffusion section close to one end of the flow stabilizing section are equal.

3. The venturi tube according to claim 1, wherein: The length of the steady flow section is A, 10cm≤A≤20cm.

4. The venturi tube according to claim 1, wherein: The length of the steady flow section is 10 cm.

5. The venturi tube according to any one of claims 1 to 4, characterized in that A transition fillet is provided at the connection between the diffusion section and the flow stabilization section.

6. The venturi tube according to claim 5, characterized in that The material of the venturi tube is one of ceramic, cast iron and stainless steel.

7. The venturi tube according to claim 5, wherein: The diffusion section and the flow stabilization section are an integrated structure.

8. The venturi tube according to claim 5, wherein: An end of the inlet section away from the contraction section extends radially outward to form a mounting portion.

9. A ceramic fiber filter tube, characterized in that: It comprises the venturi tube and the tube body as claimed in claim 8, wherein the venturi tube partially extends into the inner hole of the tube body, and the mounting portion overlaps the air inlet end of the tube body.

10. A flue gas dust removal device, characterized in that: Comprising the ceramic fiber filter tube as claimed in claim 9.

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