Smoke inlet pipeline of waste heat boiler
By installing primary guide plates, secondary guide plates, and final guide plates inside the flue, combined with a convex ridge structure, the problems of severe dust accumulation and wear in traditional flue designs are solved, achieving self-cleaning and improved energy efficiency of the flue.
Patent Information
- Application Number
- CN202520637940.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-07
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-04-07
AI Technical Summary
Traditional flue designs create low-speed vortices in the corner areas, leading to severe ash accumulation and increased pressure loss. Furthermore, traditional flow guiding technologies cannot adapt to a wide range of flow velocity control, resulting in equipment wear and high maintenance costs.
It adopts a combination design of primary guide vane, secondary guide vane and final guide vane, combined with convex ridge structure, to suppress turbulence and dust accumulation through three-stage airflow regulation, and achieve self-cleaning effect.
It reduces the pressure of ash accumulation in the flue, reduces equipment wear and maintenance costs, and improves the energy efficiency and reliability of the flue.
Smart Images
Figure CN223954124U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a pipeline, specifically to a waste heat boiler flue gas into the furnace pipeline. BACKGROUND
[0002] In the field of industrial waste heat recovery, as the key channel for high-temperature flue gas transportation, the uniformity and stability of the internal flow field of the flue directly affect the energy efficiency and reliability of the waste heat boiler.
[0003] Traditional flue designs generally use circular or rectangular cross sections, which are prone to form low-speed vortexes in the corner areas. The proportion of ash accumulation caused by corner vortexes in rectangular flues is over 60%, and the local turbulent kinetic energy is as high as over 20%, which increases the pressure loss and exacerbates the pipe wall wear.
[0004] Existing flow guide technologies mostly rely on simple flat or arc-shaped flow guide plates, which cannot adapt to a wide range of flow speed regulation. Experiments show that the standard deviation of downstream flow speed is as high as 35%, and the fixed layout is difficult to match dynamic working conditions. The ash accumulation rate is over 2mm / h at low load, the pressure loss increases by over 200Pa at high load, and the induced draft fan energy consumption increases by 10%-15%.
[0005] In addition, there is a lack of targeted vortex suppression design in the flue, and the proportion of ash accumulation in the low-speed area is over 40%. It needs to rely on high-frequency soot blowing (more than once a month), and the traditional soot blower not only accelerates equipment wear, but also increases the annual operation and maintenance cost by over 800,000 yuan. SUMMARY
[0006] In view of the technical problem of high ash accumulation pressure in the existing flue, the utility model provides a waste heat boiler flue gas into the furnace pipeline, which has the advantages of reducing ash accumulation pressure.
[0007] The technical scheme of the utility model is as follows:
[0008] A waste heat boiler flue gas into the furnace pipeline comprises:
[0009] A pipeline body, one end of which is an inlet, and the other end of which is an outlet;
[0010] A primary flow guide plate is inclinedly arranged in the pipeline body and close to the inlet, and the primary flow guide plate extends towards the outlet;
[0011] A plurality of secondary flow guide plates are inclinedly arranged downstream of the primary flow guide plate, and the inclination angles of the secondary flow guide plates gradually decrease relative to the axis of the pipeline body;
[0012] A plurality of tertiary flow guide plates are evenly distributed around the pipeline body;
[0013] A ridge is arranged on the top of the inner wall of the pipeline body and close to the outlet.
[0014] Optionally, the pipeline body is provided with a plurality of spiral grooves on both sides.
[0015] Optionally, the pipeline body is elliptical in cross section.
[0016] The long axis of the pipeline body is arranged in a horizontal direction, and the short axis is arranged in a vertical direction.
[0017] Optionally, the width direction of the primary flow guide plate is parallel to the short axis of the pipeline body, and the primary flow guide plate is inclined towards the axis direction at the end close to the outlet.
[0018] Optionally, the primary flow guide plates are symmetrically arranged on the top and bottom of the pipeline body, and the primary flow guide plates are symmetric airfoils.
[0019] Optionally, the inclination angles of all the secondary flow guide plates decrease from 30° to 10° from the inlet end to the outlet end.
[0020] Optionally, the secondary flow guide plates are symmetrically arranged on the top and bottom of the pipeline body.
[0021] Optionally, the pitch of the spiral groove is one third of the length of the pipeline body.
[0022] Optionally, the ridge extends along the inner wall of the pipeline body, and the extension direction is perpendicular to the axis of the pipeline body; a plurality of ridges are distributed along the axis direction of the pipeline body.
[0023] Optionally, the cross section of the ridge is semicircular, and the length of the ridge is one half of the length of the short axis of the pipeline body.
[0024] Compared with the prior art, the utility model has the beneficial effects that:
[0025] By arranging the primary flow guide plate in the pipeline body, the airflow is forced to turn to the central axis, then a plurality of secondary flow guide plates are arranged downstream of the processing flow guide plate, the airflow is dispersed, the cross section flow velocity distribution is balanced, and the local turbulence caused by uneven flow velocity is suppressed. The tertiary flow guide plate is arranged downstream of the secondary flow guide plate, the circumferential rotation component of the flue gas is blocked, the "spiral flow" phenomenon is eliminated, and the "converging-uniform flow-steady flow" three-stage regulation is formed in cooperation with the previous flow guide plate. Finally, the ridge is arranged close to the outlet, the low-speed area on the top of the pipeline body is destroyed, the ash deposition is prevented, the micro vortex is generated through the ridge, the shearing action of the airflow on the wall is enhanced, and self-cleaning is realized.
[0026] By the technical scheme, the purpose of reducing the ash deposition pressure in the pipeline body can be achieved. BRIEF DESCRIPTION OF DRAWINGS
[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.
[0028] Figure 1 It is a schematic diagram of the internal structure of the utility model;
[0029] Figure 2 It is a schematic diagram of the internal structure of the utility model;
[0030] Figure 3 It is a schematic diagram of the semi-partial structure of the utility model. DETAILED DESCRIPTION
[0031] In the following, only some exemplary embodiments are simply described. As those skilled in the art can realize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the drawings and the description are considered to be essentially exemplary rather than limiting.
[0032] In the description of the present application, it is understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the present application is used, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0033] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of a specific example are described in the following. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides various specific examples of processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.
[0034] The embodiments of the present application will be described in detail below with reference to the drawings.
[0035] Embodiment:
[0036] Referring to Figure 1 、 Figure 2 and Figure 3 , the present embodiment discloses a flue gas inlet pipe of a waste heat boiler, comprising a pipe body 10, a primary flow guide plate 20, a secondary flow guide plate 30, a tertiary flow guide plate 40 and a ridge 50.
[0037] Specifically, one end of the pipe body 10 is an inlet, and the other end of the pipe body 10 is an outlet. The fluid in the pipe body 10 flows from the inlet to the outlet, which defines the upstream and downstream.
[0038] The primary flow guide plate 20 is installed near the inlet of the pipe body 10 and is arranged in an inclined manner. The end of the primary flow guide plate 20 close to the inlet is close to the bottom of the pipe body 10, and the other end of the primary flow guide plate 20 extends to the outlet end of the pipe body 10 and is inclined to the axis of the pipe body 10.
[0039] A plurality of secondary flow guide plates 30 are arranged in the pipe body 10, and the secondary flow guide plates 30 are located downstream of the primary flow guide plate 20. All the secondary flow guide plates 30 are distributed along the axis of the pipe body 10, and all the secondary flow guide plates 30 are arranged in an inclined manner. The inclination angles of all the secondary flow guide plates 30 gradually decrease from upstream to downstream. The inclination angle of the secondary flow guide plate 30 is relative to the axis of the pipe body 10, and the width direction of all the secondary flow guide plates 30 is arranged in a horizontal direction.
[0040] A plurality of tertiary flow guide plates 40 are arranged in the pipe body 10, and all the tertiary flow guide plates 40 are uniformly distributed around the pipe body 10, and all the tertiary flow guide plates 40 are located downstream of the secondary flow guide plate 30.
[0041] Finally, the ridge 50 is arranged on the outlet end of the pipe body 10, the ridge 50 is arranged on the top of the pipe body 10, the extension direction of the ridge 50 is perpendicular to the axis of the pipe body 10, and the ridge 50 is located downstream of the tertiary flow guide plate 40.
[0042] In the embodiment, by arranging the primary guide plate 20 in the pipeline body 10, the airflow is forced to turn to the central axis, then a plurality of secondary guide plates 30 are arranged downstream of the processing guide plate to disperse the airflow, balance the cross-sectional flow velocity distribution, and suppress local turbulence caused by uneven flow velocity. The tertiary guide plate 40 is arranged downstream of the secondary guide plate 30 to block the circumferential rotation component of the flue gas, eliminate the “spiral flow” phenomenon, and cooperate with the previous guide plate to form a “converging-flow-stabilizing” three-stage regulation. Finally, the ridge 50 is arranged near the outlet to destroy the low-speed area at the top of the pipeline body 10, prevent ash deposition, and generate micro-vortices through the ridge 50 to enhance the shear action of the airflow on the wall, thereby achieving self-cleaning. Through the technical scheme, the purpose of reducing the ash deposition pressure in the pipeline body 10 can be achieved.
[0043] In one specific embodiment:
[0044] The pipeline body 10 is provided with a plurality of spiral grooves 60 on both sides. By designing the spiral grooves 60, the wall-attached airflow rotation component is converted into axial momentum, the boundary layer separation is reduced, and the corner vortex generation is suppressed.
[0045] Preferably, the pitch of the spiral groove 60 is one-third of the length of the pipeline body 10. Through the cooperation of weak spiral disturbance and axial dominant flow, an optimal balance between vortex suppression, drag reduction, and self-cleaning is achieved, which is a high-performance-price ratio choice for industrial flue guide structures.
[0046] In another specific embodiment:
[0047] The cross-section of the pipeline body 10 is elliptical, and the long axis of the pipeline body 10 is arranged in the horizontal direction and the short axis is arranged in the vertical direction. Compared with the rectangular structure, the elliptical structure can reduce the corner vortex and reduce the risk of airflow separation.
[0048] Preferably, the width direction of the primary guide plate 20 is parallel to the short axis of the pipeline body 10, and the primary guide plate 20 is inclined towards the axis near the outlet end. The top and bottom of the pipeline body 10 are symmetrically provided with the primary guide plate 20, and the primary guide plate 20 is a symmetric airfoil. The symmetric airfoil structure of the primary guide plate 20 can reduce the obstruction to the airflow.
[0049] In another specific embodiment:
[0050] The inclination angles of all secondary guide plates 30 decrease from 30° to 10° from the inlet end to the outlet end. In this scheme, a total of three secondary guide plates 30 are designed, and the inclination angles of the three secondary guide plates 30 from upstream to downstream are 30°, 20°, and 10°, respectively. The included angle between the secondary guide plate 30 and the axis of the pipeline body 10 transitions from 30° to 10°, gradually reducing the flow velocity gradient.
[0051] Preferably, the top and bottom of the pipeline body 10 are symmetrically provided with secondary guide plates 30, through which design, the airflow in the pipeline body 10 is balanced, and strong scouring on the top of the pipeline body 10 is avoided.
[0052] In another specific embodiment,
[0053] The ridges 50 extend along the inner wall of the pipeline body 10, and the extension direction is perpendicular to the axis of the pipeline body 10. A plurality of ridges 50 are distributed along the axis direction of the pipeline body 10, and a continuous wave structure is formed along the axis direction of the pipeline body 10. The ridge 50-recess alternating structure forms a local high-speed area, and the airflow is used to wash away the particulate matter. In addition, the ridge 50 needs to be continuous and smooth to prevent local flow separation.
[0054] Preferably, the cross section of the ridge 50 is semicircular, and the length of the ridge 50 is half of the length of the short axis of the pipeline body 10. The semicircular cross section of the ridge 50 is the optimal choice for the vortex prevention ridge 50 of the pipeline body 10 through the streamline drag reduction, high shear force self-cleaning and low stress structure, and has performance and economic benefits.
[0055] The above-described embodiments only express the specific implementation of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application.
Claims
1. A flue gas inlet duct for a waste heat boiler, characterized in that The utility model relates to a pipeline, comprising: a pipeline body having an inlet at one end and an outlet at the other end; a primary flow guide plate disposed obliquely within the pipeline body and proximate to the inlet, the primary flow guide plate extending towards the outlet; a plurality of secondary flow guide plates disposed obliquely downstream of the primary flow guide plate, the secondary flow guide plates having a gradually decreasing angle of inclination relative to the axis of the pipeline body; a plurality of tertiary flow guide plates distributed evenly around the circumference of the pipeline body; a ridge disposed on the top inner wall of the pipeline body proximate to the outlet.
2. The flue gas inlet duct of a waste heat boiler according to claim 1, characterized in that The pipeline body has a plurality of helical grooves disposed on either side thereof.
3. The flue gas inlet duct of a waste heat boiler according to claim 2, characterized in that The cross-section of the pipeline body is elliptical. The major axis of the pipeline body is disposed horizontally and the minor axis is disposed vertically.
4. The flue gas inlet duct of a waste heat boiler according to claim 3, characterized in that The width direction of the primary flow guide plate is parallel to the minor axis of the pipeline body, and the proximate-to-outlet end of the primary flow guide plate is inclined towards the axis.
5. The flue gas inlet duct of a waste heat boiler according to claim 4, characterized in that The primary flow guide plates are symmetrically disposed on the top and bottom of the pipeline body, and are symmetric airfoils.
6. The flue gas inlet duct of a waste heat boiler according to claim 3, characterized in that The angle of inclination of all the secondary flow guide plates decreases from 30° to 10° from the inlet end to the outlet end.
7. The flue gas inlet duct of a waste heat boiler according to claim 6, characterized in that The secondary flow guide plates are symmetrically disposed on the top and bottom of the pipeline body.
8. The flue gas inlet duct of a waste heat boiler according to claim 3, characterized in that The pitch of the helical grooves is one-third of the length of the pipeline body.
9. The flue gas inlet duct of a waste heat boiler according to claim 3, characterized in that The ridge extends along the inner wall of the pipeline body, and the extension direction is perpendicular to the axis of the pipeline body; along the axis direction of the pipeline body, a plurality of ridges are distributed.
10. The flue gas inlet duct of a waste heat boiler according to claim 9, characterized in that The cross-section of the ridge is semicircular, and the length of the ridge is half the length of the minor axis of the pipeline body.