Flue gas guiding device applied to outlet of boiler denitration device
By installing a flow guiding component at the outlet of the boiler denitrification device, the problem of uneven flue gas flow field was solved, and uniform flow of flue gas in the air preheater tube box was achieved, thus improving heat exchange efficiency.
Patent Information
- Application Number
- CN202520291719.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-24
- Publication Date
- 2026-01-16
- Estimated Expiration
- 2035-02-24
AI Technical Summary
Uneven flue gas flow at the boiler denitrification unit outlet causes localized low-speed and high-speed zones in the flue gas within the air preheater tube box, leading to ash accumulation and wear, which affects heat exchange efficiency.
A first flow guiding component and a second flow guiding component, including a flow guiding plate and a flow guiding baffle, are installed at the outlet of the boiler denitrification device. By rectifying and homogenizing the flue gas flow field, the flue gas is ensured to enter the primary air preheater and the secondary air preheater tube box evenly.
Through the synergistic effect of the flow guiding components, the flue gas flow becomes more uniform and stable, improving the heat exchange efficiency of the preheater.
Smart Images
Figure CN223807204U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a boiler technical field, concretely relates to a flue gas flow guide device applied to the outlet of boiler denitration device. BACKGROUND
[0002] The boiler flue gas passes through two right angle elbows, an obtuse angle elbow, then passes through a right angle elbow, and finally passes through an irregular variable diameter flue which becomes larger from small, and then enters the front and rear two air preheater tube boxes respectively. Because the flue gas is turned several times, the flue gas flow field at the air preheater inlet is seriously deflected, the flue gas flow into the tube box close to the front secondary air preheater is less, and the flue gas flow into the tube box close to the rear primary air preheater is more.
[0003] Due to the uneven flue gas flow field, there are local low speed area and local high speed area in the flue. The inlet velocity field distribution is high in the middle and low on both sides. The low speed area forms a flue gas dead zone, which leads to ash deposition and worse heat exchange, and the high speed area is prone to wear. The uneven heat exchange caused by uneven flue gas flow field further causes uneven flue gas temperature field, which leads to poor heat exchange and low efficiency. SUMMARY
[0004] The utility model aims at providing a flue gas flow guide device applied to the outlet of boiler denitration device to solve the problem of uneven flue gas at the outlet of boiler denitration device mentioned in the background.
[0005] To solve the above technical problems, the utility model provides a flue gas flow guide device applied to the outlet of boiler denitration device for uniform flue gas flow field through the upper flue into the primary air preheater tube box and the secondary air preheater tube box respectively, which comprises a first flow guide component and a second flow guide component, the first flow guide component is arranged in the flue for rectifying the flue gas, and the second flow guide component is arranged in the flue at the inlet end of the secondary air preheater tube box for uniform flue gas.
[0006] Further, the first flow guide component comprises a first flow guide plate and a second flow guide plate, a plurality of first flow guide plates are installed on both sides of the flue inlet end, and a plurality of second flow guide plates are installed at the turning position of the flue.
[0007] Further, the arrangement angle between the first flow guide plate and the baffle plate on both sides of the flue is 45°.
[0008] Further, a plurality of supporting rods are installed at the turning position of the flue, the second flow guide plate is a flow guide flap, and the flow guide flap is welded on the supporting rod.
[0009] Further, the second flow guide assembly comprises third flow guide plates and fourth flow guide plates, and the third flow guide plates and the fourth flow guide plates are arranged in a longitudinal and transverse staggered manner.
[0010] Further, the third flow guide plates are arranged along the width direction of the flue, and the arrangement angle is 45-60°, and the fourth flow guide plates are arranged along the depth direction of the flue, and the arrangement angle is 30-60°.
[0011] Further, the third flow guide plates are composed of a plurality of spliced plates, and the spliced plates are adapted to the fourth flow guide plates.
[0012] The utility model discloses the beneficial effect is: the utility model discloses the synergistic effect of first flow guide assembly and second flow guide assembly, and the smoke in the flowing process has obtained the full rectification and homogenization processing, makes the smoke when entering primary air preheater pipe box and secondary air preheater pipe box, and its flow state is more uniform and stable, thereby improves the preheating efficiency. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 It is the structural schematic diagram of the utility model embodiment.
[0014] Figure 2 It is the smoke flow direction schematic diagram of the utility model embodiment.
[0015] Figure 3 It is the first flow guide plate local structure schematic diagram of the utility model embodiment.
[0016] Figure 4 It is the second flow guide plate local structure schematic diagram of the utility model embodiment.
[0017] Figure 5 It is the second flow guide assembly side view structure schematic diagram of the utility model embodiment.
[0018] Figure 6 It is the second flow guide assembly three-dimensional structure schematic diagram of the utility model embodiment.
[0019] Wherein: 1, flue; 2, primary air preheater pipe box; 3, secondary air preheater pipe box; 4, first flow guide assembly; 5, second flow guide assembly; 6, support rod.
[0020] 41, first flow guide plate; 42, second flow guide plate; 51, third flow guide plate; 52, fourth flow guide plate. DETAILED DESCRIPTION
[0021] Clearly, the described embodiments are merely embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.
[0022] In order to make the purposes, technical schemes and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and specific embodiments.
[0023] In the following description, the reference to "one embodiment", "an embodiment", "one example", "an example" and the like indicates that the embodiment or example so described can include a particular feature, structure, characteristic, property, element or limitation, but every embodiment or example need not necessarily include the particular feature, structure, characteristic, property, element or limitation. Moreover, repeated use of the phrase "according to an embodiment of the present application" does not necessarily refer to the same embodiment, although it can.
[0024] As shown in Figures 1-6 The utility model discloses a kind of flue gas flow guide devices applied to the outlet of boiler denitration device, for the flue gas flow field of uniform through upper flue 1 respectively into primary air preheater pipe box 2 and secondary air preheater pipe box 3, the flue 1 is an irregular variable-diameter flue 1 by small, i.e. its import end is 90 ° variable-diameter elbow, transverse section is reduced to 11760mm from 13770mm, then after a turning point, it is divided into primary air preheater pipe box 2 and secondary air preheater pipe box 3.The second flow guide component 5 is arranged in the flue 1 of secondary air preheater pipe box 3 import end, for uniform flue gas.
[0025] That is, the device is arranged in the irregular variable-diameter flue 1 of preheater pipe box upper portion, for changing the flow direction of flue gas, eliminating uneven flue gas.When flue gas flows out from the outlet of boiler denitration device, its flow state can not be uniform, there are vortex, turbulent flow and other phenomena. First flow guide component 4 (such as flow guide plate, rectifier grid etc.) is guided and adjusted to flue gas by its specific structure, so that its flow state becomes more uniform and stable. After being rectified by first flow guide component 4, flue gas can still exist some local uneven phenomena before entering secondary air preheater pipe box 3. Second flow guide component 5 is finely designed (such as diffusion section, contraction section, flow guide hole etc.), and flue gas is uniformly treated again, to ensure that flue gas can uniformly enter secondary air preheater pipe box 3, thereby improving preheating efficiency.
[0026] The utility model discloses a first flow guide component 4 and second flow guide component 5's synergies, and the smoke has been given full rectification and homogenization treatment in the flowing process, makes the smoke when entering primary air preheater pipe box 2 and secondary air preheater pipe box 3, its flow state is more uniform and stable, thereby improves the preheating efficiency.
[0027] In one embodiment, the first flow guide component 4 includes a first flow guide plate 41 and a second flow guide plate 42, a plurality of first flow guide plates 41 are installed on both sides of the inlet end of the flue 1, and a plurality of second flow guide plates 42 are installed at the turning point of the flue 1 at intervals for eliminating the biasing force and rectifying.
[0028] In this embodiment, two first flow guide plates 41 are provided, which are composed of two irregular steel plates. During installation, the contact surface of the two first flow guide plates 41 does not fit, and the cutting and grinding are performed on site according to actual needs. The plurality of second flow guide plates 42 are arranged in three layers from the front of the furnace to the rear of the furnace, the second flow guide plate 42 has a bending radius R800, and the spacing between the two layers of folded plates is about 700mm; the size and angle of the folded plate are determined by flow field analysis.
[0029] In one embodiment, the arrangement angle between the first flow guide plate 41 and the guard plate on both sides of the flue 1 is 45°.
[0030] In one embodiment, a plurality of support rods 6 are installed at the turning point of the flue 1, and the second flow guide plate 42 is a flow guide folded plate welded on the support rod 6. In this embodiment, an H-shaped steel is used to manufacture a cross-shaped frame support rod 6 for fixing the second flow guide plate 42 at the turning point of the flue 1, and the flue 1 is divided into about 24 support frames along the width direction, with a horizontal pitch of about 1000mm. The second flow guide plate 42 is cut and ground on site and welded at the contact point with the support rod 6.
[0031] In one embodiment, the second flow guide component 5 includes a third flow guide plate 51 and a fourth flow guide plate 52, and the plurality of third flow guide plates 51 and the plurality of fourth flow guide plates 52 are arranged in a grid shape to effectively guide the flow of flue gas inside the flue 1, ensure that the airflow distribution inside the flue 1 is more uniform, and avoid the situation of local airflow being too strong or too weak. The size, spacing and direction of the grid-shaped flue gas passage formed by the third flow guide plate 51 and the fourth flow guide plate 52 are determined by flow field analysis.
[0032] In one embodiment, the plurality of third flow guide plates 51 are arranged along the width direction of the flue 1, and the arrangement angle is 45°-60°, which is used to distribute part of the airflow to both sides to fill the entire flue 1 space. The plurality of fourth flow guide plates 52 are arranged along the depth direction of the flue 1, and the arrangement angle is 30°-60°, which is used to rectify the uniformity of the flue gas entering the air preheater from the front end.
[0033] In one embodiment, the third guide plate 51 is composed of a plurality of spliced plates, and the plurality of spliced plates are adapted to the plurality of fourth guide plates 52, facilitating installation.
[0034] The design idea of the embodiment of the utility model is as follows:
[0035] The irregular flue 1 on the upper part of the primary air preheater pipe box 2 and the secondary air preheater pipe box 3 is provided with a flow guide device, specifically a first flow guide assembly 4 and a second flow guide assembly 5, and through the synergistic effect of the first flow guide assembly 4 and the second flow guide assembly 5, the flue gas is fully rectified and homogenized in the flow process.
[0036] The first flow guide assembly 4 is a first guide plate 41 arranged on both sides of the inlet end of the flue 1 and a second guide plate 42 arranged at the turning position of the flue 1, which is used to eliminate the deflection force and rectify the flow, so that the flue gas flow field at the inlet end of the secondary air preheater pipe box 3 is uniform. The second flow guide assembly 5 is a third guide plate 51 and a fourth guide plate 52 arranged in a grid shape in a longitudinal and transverse staggered manner, the third guide plate 51 is used to distribute part of the airflow to both sides to fill the entire flue 1 space, and the fourth guide plate 52 is used to rectify the uniformity of the flue gas at the inlet of the air preheater.
[0037] The utility model discloses through the synergistic effect of the first flow guide assembly 4 and the second flow guide assembly 5, the flue gas is fully rectified and homogenized in the flow process, so that the flow state of the flue gas is more uniform and stable when entering the primary air preheater pipe box 2 and the secondary air preheater pipe box 3, thereby improving the preheating efficiency.
[0038] The above description of the disclosed embodiments is that the professional skilled in the art can realize or use the utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A flue gas flow guide device applied to the outlet of a boiler denitration device, used for uniform flue gas flow field passing through the upper flue into the primary air preheater tube box and the secondary air preheater tube box respectively, characterized in that: The application relates to a flue gas flow guiding device for a boiler, which comprises a first flow guiding component and a second flow guiding component.
2. The flue gas flow guide device applied to the outlet of a boiler denitration device according to claim 1, characterized in that: The first flow guiding component is arranged in the flue for guiding the flue gas, and the second flow guiding component is arranged in the flue at the inlet end of the secondary air preheater pipe box for uniformly distributing the flue gas.
3. The flue gas flow guide device applied to the outlet of the denitration device of a boiler according to claim 2, characterized in that: The first flow guiding component comprises first flow guiding plates and second flow guiding plates.
4. The flue gas flow guide device applied to the outlet of the denitration device of a boiler according to claim 2, characterized in that: The first flow guiding plates are arranged on both sides of the inlet end of the flue.
5. The flue gas flow guiding device applied to the outlet of a boiler denitration device according to claim 1, characterized in that: The arrangement angle between the first flow guiding plates and the side plates of the flue is 45 degrees.
6. The flue gas flow guiding device applied to the outlet of a boiler denitration device according to claim 5, characterized in that: A plurality of supporting rods are arranged at the turning position of the flue.
7. The flue gas flow guide device applied to the outlet of a boiler denitration device according to claim 6, characterized in that: The second flow guiding plates are flow guiding folded plates which are welded on the supporting rods. The second flow guiding component comprises third flow guiding plates and fourth flow guiding plates. The third flow guiding plates and the fourth flow guiding plates are arranged in a longitudinal and transverse manner. The third flow guiding plates are arranged along the width direction of the flue with an arrangement angle of 45-60 degrees. The fourth flow guiding plates are arranged along the depth direction of the flue with an arrangement angle of 30-60 degrees. The third flow guiding plates are composed of a plurality of spliced plates which are adapted to the fourth flow guiding plates.