Flue system
By increasing the width of the main expansion section of the main flue along its length and utilizing the branch and radial opening structure of the bypass flue, the introduced high-temperature flue gas is uniformly mixed with the flue gas in the main flue, solving the problem of insufficient mixing caused by the lack of a straight section in the main flue, and improving the denitrification effect and SCR reaction efficiency.
Patent Information
- Application Number
- CN202511476909.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-16
- Publication Date
- 2026-01-13
AI Technical Summary
In existing thermal power units, the main flue does not have a straight section connecting to the bypass flue, which prevents the introduced high-temperature flue gas from being fully mixed and diffused, affecting the effect and efficiency of the SCR reaction.
Design a flue system in which the width of the main expansion section of the main flue increases along its length, and the bypass flue is connected to the main expansion section through multiple branches. The flue gas in the branches diffuses evenly along its width and mixes thoroughly with the flue gas in the main expansion section through radially arranged strip openings.
This improves the effectiveness and efficiency of flue gas denitrification and ensures the smooth progress of the SCR reaction.
Smart Images
Figure CN121322972A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of combustion equipment, in particular to a flue system. BACKGROUND
[0002] The power plant usually adopts selective catalytic reduction (SCR) technology for flue gas denitrification, that is, the high-temperature flue gas upstream of the economizer is introduced into the part of the main flue located between the economizer and the SCR reaction zone through the bypass flue, so as to improve the flue gas temperature downstream of the economizer and make the SCR reaction zone smoothly perform the SCR reaction.
[0003] However, the bypass flue of the related technology needs to be connected to the straight section of the main flue, and the straight section needs to have sufficient length to enable the introduced high-temperature flue gas to fully mix and diffuse in the main flue, so as to ensure the effect and efficiency of the SCR reaction. In the power plant that has been running and needs to be modified for SCR, the main flue does not have a straight section for connecting the bypass flue, and after the SCR modification, the bypass flue can only be connected to the expansion section of the main flue, and the introduced high-temperature flue gas cannot fully mix and diffuse, resulting in poor effect and efficiency of flue gas denitrification. SUMMARY
[0004] The present application aims to at least partially solve one of the technical problems in the related art.
[0005] To this end, an embodiment of the present application proposes a flue system.
[0006] The flue system of the embodiment of the present application comprises: a main flue and a bypass flue, the main flue comprises a main expansion section, the width of the main expansion section is set to increase in the flue gas direction flowing along the length direction of the main expansion section, the bypass flue comprises a plurality of branches arranged at intervals along the width direction of the main expansion section, each branch is in communication with the main expansion section and forms a strip-shaped opening extending along the length direction of the main expansion section, and the plurality of strip-shaped openings are arranged radially along the flue gas direction.
[0007] The flue system of the embodiment of the present application, the flue gas in the bypass flue is introduced into the main expansion section of the main flue by the plurality of branches, so that the introduced flue gas uniformly flows along the width direction of the main expansion section. Since the plurality of strip-shaped openings are arranged radially, the introduced flue gas can uniformly diffuse along the main expansion section and fully mix with the flue gas in the main expansion section, thereby improving the effect and efficiency of flue gas denitrification.
[0008] In some embodiments, one end of the main expansion section in the width direction thereof is arranged straight along the length direction of the main expansion section, the other end of the main expansion section in the width direction thereof is arranged obliquely along the length direction of the main expansion section, the center line direction of the strip-shaped opening forms an included angle with the length direction of the main expansion section, and the included angle of the strip-shaped openings increases successively along the direction from one end to the other end of the main expansion section in the width direction thereof.
[0009] In some embodiments, both ends of the main expansion section in the width direction thereof are arranged obliquely away from the center line of the main expansion section along the direction of the flue gas, the center line direction of the strip-shaped opening forms an included angle with the length direction of the main expansion section, and the included angle of one strip-shaped opening farther away from the center line of the main expansion section is greater than that of another strip-shaped opening adjacent to the center line of the main expansion section.
[0010] In some embodiments, the branch communicated with the strip-shaped opening with the included angle greater than zero comprises a straight section and a twisted section, the straight section extends along the length direction of the branch and is arranged straight, and the twisted section extends along the length direction of the branch and is arranged twisted and is connected transitionally between the straight section and the strip-shaped opening.
[0011] In some embodiments, the bypass flue further comprises a bypass main section and a bypass expansion section, the bypass expansion section is connected between the bypass main section and the plurality of branches, the width of the bypass expansion section is arranged to increase from the bypass main section to the plurality of branches, and the plurality of branches are arranged spaced apart along the width direction of the bypass expansion section.
[0012] In some embodiments, the flue system further comprises a plurality of first guide plates, the plurality of first guide plates are arranged spaced apart in the main expansion section along the width direction of the main expansion section, the first guide plates and the strip-shaped openings are arranged alternately along the width direction of the main expansion section, and the plurality of first guide plates are arranged radially along the direction of the flue gas for guiding the flue gas entering the main expansion section through the strip-shaped openings.
[0013] In some embodiments, the strip-shaped opening is arranged between adjacent first guide plates.
[0014] In some embodiments, the width of the strip-shaped opening is constant, both ends of the strip-shaped opening in the width direction thereof are provided with corresponding first guide plates, and the first guide plates are flush with the edges corresponding to the one end of the strip-shaped opening.
[0015] In some embodiments, the flue system further comprises a plurality of second baffles, the plurality of second baffles are arranged in the main expansion section along the width direction of the main expansion section, and the plurality of second baffles are arranged radially along the flue gas direction and are located downstream of the plurality of first baffles.
[0016] In some embodiments, the strip-shaped opening is arranged between adjacent first baffles, the first baffles extend along the thickness direction of the main expansion section and are connected to at least one end of the main expansion section provided with the strip-shaped opening, and the second baffles extend along the thickness direction of the main expansion section and are connected between two ends of the main expansion section. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 is a schematic view of a flue system according to an embodiment of the present application; Figure 2 is a front view of a flue system according to an embodiment of the present application; Figure 3 is Figure 2 is a partially enlarged schematic view of a sectional view along A-A in Figure 4 is a side view of a main expansion section and a bypass flue of a flue system according to an embodiment of the present application; Figure 5 is a partial front sectional view of a main expansion section and a bypass flue of a flue system according to an embodiment of the present application.
[0018] REFERENCE NUMERALS: 1, main flue; 11, main expansion section; 12, first vertical section; 13, second vertical section; 14, third vertical section; 2, bypass flue; 21, branch; 211, straight section; 212, twisted section; 22, bypass main section; 23, bypass expansion section; 3, strip-shaped opening; 4, first baffle; 5, second baffle; 6, economizer; 7, ammonia injection grid; 8, denitration device. DETAILED DESCRIPTION
[0019] Embodiments of the present application are described in detail below with reference to the accompanying drawings. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.
[0020] Reference is made below to Figures 1-5 a flue system according to an embodiment of the present application.
[0021] As Figures 1-5 shown, the flue system according to an embodiment of the present application comprises a main flue 1 and a bypass flue 2.
[0022] The main flue 1 comprises a main expansion section 11, and the width W1 of the main expansion section 11 is arranged to increase in the direction of the flue gas flowing along the length L1 of the main expansion section 11. As shown in Figures 1-4 , the main expansion section 11 extends in the left-right direction as shown in Figure 1 , can extend horizontally in the left-right direction as shown in Figure 1 , or can extend obliquely in the left-right direction as shown in Figure 1 , so the length L1 direction of the main expansion section 11 is the left-right direction as shown in Figure 1 , and the flue gas in the main flue 1 flows in the direction from right to left when passing through the main expansion section 11 and forms a flue gas direction, and the width W1 of the main expansion section 11 can gradually increase in the direction from right to left to continuously expand, or can increase in steps in the direction from right to left to expand in intervals, and is preferably arranged to increase in steps.
[0023] The bypass flue 2 comprises a plurality of branch passages 21 arranged in intervals in the width W1 direction of the main expansion section 11. As shown in Figure 1 and Figure 4 , the main expansion section 11 has a width W1 and a thickness T1 formed on a cross section, and the width W1 is greater than or equal to the thickness T1, and preferably the width W1 is greater than the thickness T1, the width W1 direction is the front-back direction as shown in Figure 1 , and the thickness T1 direction is the up-down direction as shown in Figure 1 . The plurality of branch passages 21 are arranged in intervals in the front-back direction as shown in Figure 1 .
[0024] Each branch passage 21 communicates with the main expansion section 11 and forms a strip-shaped opening 3 extending in the length L1 direction of the main expansion section 11, and in the flue gas direction, the plurality of strip-shaped openings 3 are arranged radially. As shown in Figures 1-3 , the bottom end of the branch passage 21 communicates with the top wall surface of the main expansion section 11, the opening of the bottom end of the branch passage 21 penetrates the top wall surface of the main expansion section 11 and forms the strip-shaped opening 3, and the strip-shaped opening 3 extends in the left-right direction as shown in Figure 1 , and the plurality of strip-shaped openings 3 are arranged in intervals in the front-back direction as shown in Figure 1 , and in the flue gas direction from right to left, the plurality of strip-shaped openings 3 are arranged radially.
[0025] The flue system of the embodiment of the present application, the flue gas in the bypass flue 2 is introduced into the main expansion section 11 of the main flue 1 by the plurality of branch passages 21, so that the introduced flue gas is uniformly distributed in the width W1 direction of the main expansion section 11, and since the plurality of strip-shaped openings 3 are arranged radially, the introduced flue gas can be uniformly diffused along the main expansion section 11 and fully mixed with the flue gas in the main expansion section 11, thereby improving the effect and efficiency of flue gas denitration.
[0026] In some embodiments, as shown in Figure 1 and Figure 2As shown, the flue system further comprises a coal economizer 6, an ammonia injection grid 7 and a denitration device 8 arranged in the main flue 1, the coal economizer 6, the ammonia injection grid 7 and the denitration device 8 are arranged in sequence along the flow direction of the flue gas in the main flue 1, the main expansion section 11 is located between the coal economizer 6 and the ammonia injection grid 7, and the bypass flue 2 is connected to the part of the main flue 1 upstream of the coal economizer 6 along the flow direction of the flue gas in the main flue 1 at the top of the plurality of branches 21, so as to introduce the high-temperature flue gas upstream of the coal economizer 6 in the main flue 1 into the main expansion section 11 of the main flue 1, then fully mix with the original flue gas in the main expansion section 11 and flow along the flue gas direction, so as to improve the flue gas temperature in the main expansion section 11 and ensure the progress of the SCR reaction.
[0027] In some embodiments, as shown in Figure 1 and Figure 2 , the main flue 1 comprises a first vertical section 12, a second vertical section 13 and a third vertical section 14, the first vertical section 12, the second vertical section 13 and the third vertical section 14 all extend along the up-down direction as shown in Figure 1 , and are arranged in intervals along the left-right direction as shown in Figure 1 , the main expansion section 11 is connected between the bottom end of the first vertical section 12 and the bottom end of the second vertical section 13, the bottom end of the bypass flue 2 provided with the plurality of branches 21 is located between the first vertical section 12 and the second vertical section 13, the top end of the second vertical section 13 is connected to the top end of the third vertical section 14, the coal economizer 6 is arranged in the first vertical section 12, the ammonia injection grid 7 is arranged in the second vertical section 13, and the denitration device 8 is arranged in the third vertical section 14.
[0028] In some embodiments, one end (the rear end as shown in Figure 1 , also the bottom end as shown in Figure 3 ) of the main expansion section 11 in the width W1 direction is arranged straight along the length L1 direction of the main expansion section 11 (the left-right direction as shown in Figure 1 and Figure 3 ), and the other end (the front end as shown in Figure 1 , also the top end as shown in Figure 3 ) of the main expansion section 11 in the width W1 direction is arranged inclined along the length L1 direction of the main expansion section 11 (the left-right direction as shown in Figure 1 and Figure 3 ), specifically, extends along the direction from right to left as shown in Figure 1 , and is arranged inclined along the direction from rear to front, which can be continuously inclined or arranged in steps, so as to increase the width W1 of the main expansion section 11 along the direction from right to left.
[0029] As shown in Figure 3 , the center line C direction of the strip-shaped opening 3 is parallel to the length L1 direction of the main expansion section 11 (the left-right direction as shown in Figure 3forms an included angle a greater than or equal to zero between the direction from one end (e.g. the bottom end as shown) to the other end (e.g. the top end as shown) of the main expansion section 11, and the width W1 direction of the main expansion section 11. In other words, the included angle a of the plurality of strip-shaped openings 3 increases in sequence in the direction from the one end (e.g. the bottom end as shown) to the other end (e.g. the top end as shown) of the main expansion section 11, so that the plurality of strip-shaped openings 3 are arranged in a radial manner. Figure 3 In the example as shown, the included angle a of the strip-shaped opening 3 located at the lowest end in the middle can be zero or greater than zero, and is preferably greater than zero, and the included angles a of the remaining strip-shaped openings 3 are all greater than zero. Figure 3 In the example as shown, the included angle a of the strip-shaped opening 3 located at the lowest end in the middle can be zero or greater than zero, and is preferably greater than zero, and the included angles a of the remaining strip-shaped openings 3 are all greater than zero. Figure 3 Figure 3 It can be understood that the structure of the main expansion section 11 and the arrangement direction of the plurality of strip-shaped openings 3 are not limited to the example as shown, and in other embodiments, along the flue gas direction (e.g. the right-to-left direction as shown), both ends in the width W1 direction of the main expansion section 11 are arranged in a direction away from the center line of the main expansion section 11, in other words, the front end of the main expansion section 11 extends in the right-to-left direction as shown, and is arranged in a rear-to-front direction, and the rear end of the main expansion section 11 extends in the right-to-left direction, and is arranged in a front-to-rear direction. So that the width W1 of the main expansion section 11 increases in the right-to-left direction.
[0030] It can be understood that the structure of the main expansion section 11 and the arrangement direction of the plurality of strip-shaped openings 3 are not limited to the example as shown, and in other embodiments, along the flue gas direction (e.g. the right-to-left direction as shown), both ends in the width W1 direction of the main expansion section 11 are arranged in a direction away from the center line of the main expansion section 11, in other words, the front end of the main expansion section 11 extends in the right-to-left direction as shown, and is arranged in a rear-to-front direction, and the rear end of the main expansion section 11 extends in the right-to-left direction, and is arranged in a front-to-rear direction. So that the width W1 of the main expansion section 11 increases in the right-to-left direction. Figures 1-3 Figure 1 In the example as shown, the included angle a of the strip-shaped opening 3 located at the lowest end in the middle can be zero or greater than zero, and is preferably greater than zero, and the included angles a of the remaining strip-shaped openings 3 are all greater than zero. Figure 1 It can be understood that the structure of the main expansion section 11 and the arrangement direction of the plurality of strip-shaped openings 3 are not limited to the example as shown, and in other embodiments, along the flue gas direction (e.g. the right-to-left direction as shown), both ends in the width W1 direction of the main expansion section 11 are arranged in a direction away from the center line of the main expansion section 11, in other words, the front end of the main expansion section 11 extends in the right-to-left direction as shown, and is arranged in a rear-to-front direction, and the rear end of the main expansion section 11 extends in the right-to-left direction, and is arranged in a front-to-rear direction. So that the width W1 of the main expansion section 11 increases in the right-to-left direction.
[0031] In the example as shown, the included angle a of the strip-shaped opening 3 located at the lowest end in the middle can be zero or greater than zero, and is preferably greater than zero, and the included angles a of the remaining strip-shaped openings 3 are all greater than zero.
[0032] In some embodiments, the width W3 of the strip-shaped opening 3 is preferably but not limited to constant, and is arranged in the direction from the one end (e.g. the bottom end as shown) to the other end (e.g. the top end as shown) of the main expansion section 11.
[0033] Figure 1 In some embodiments, the width W3 of the strip-shaped opening 3 is preferably but not limited to constant, and is arranged in the direction from the one end (e.g. the bottom end as shown) to the other end (e.g. the top end as shown) of the main expansion section 11. Figure 3 The distance between the adjacent strip-shaped openings 3 increases from right to left, so that the plurality of strip-shaped openings 3 are arranged radially.
[0034] In some embodiments, the branch 21 communicating with the strip-shaped opening 3 with the included angle α greater than zero comprises a straight section 211 and a twisted section 212, the straight section 211 extends along the length L2 direction of the branch 21 (as Figure 4 indicated in the vertical direction) and is arranged straight, and the twisted section 212 extends along the length L2 direction of the branch 21 and is arranged twisted, and is transitionally connected between the straight section 211 and the strip-shaped opening 3.
[0035] As Figure 3 and Figure 4 indicated, the included angle α of all strip-shaped openings 3 is greater than zero, and each branch 21 comprises a straight section 211 and a twisted section 212 extending along the vertical direction as Figure 4 indicated and connected in sequence.
[0036] The straight section 211 extends along the vertical direction and is arranged straight, so as to facilitate the smoke in the bypass flue 2 to be shunted into each branch 21, and the cross section of the straight section 211 is preferably but not limited to rectangular.
[0037] The twisted section 212 extends along the vertical direction and is arranged twisted, and is transitionally connected between the straight section 211 and the strip-shaped opening 3, the smoke in the branch 21 is guided by the straight section 211 through the strip-shaped opening 3 through the twisted section 212, and the twisted section 212 guides and twists the passing smoke to the same angle as the strip-shaped opening 3, so that the smoke introduced into the main expansion section 11 by the plurality of strip-shaped openings 3 is radially arranged, thereby facilitating the smoke to be fully mixed with the original smoke in the main expansion section 11. The cross section of the twisted section 212 is preferably but not limited to parallelogram, and the strip-shaped opening 3 is preferably but not limited to parallelogram.
[0038] Further, the length of the twisted section 212 is not less than 200 mm, so as to ensure that the smoke is fully twisted.
[0039] Further, the cross-sectional area of the twisted section 212 is substantially the same as the cross-sectional area of the straight section 211, and preferably, the cross-sectional area of the twisted section 212 is 90% to 110% of the cross-sectional area of the straight section 211, so as to avoid vortex of the smoke after entering the twisted section 212 from the straight section 211.
[0040] It can be understood that, not limited to all branches 21 comprising the straight section 211 and the twisted section 212, in another embodiment, the branch 21 communicating with the strip-shaped opening 3 with the included angle α equal to zero comprises a straight section 211, the straight section 211 directly communicates with the strip-shaped opening 3, in other words, the straight section 211 is directly connected with the main expansion section 11.
[0041] In some embodiments, the bypass flue 2 further includes a bypass main section 22 and a bypass expansion section 23. The bypass expansion section 23 is connected between the bypass main section 22 and a plurality of branch lines 21. The width W2 of the bypass expansion section 23 is set to increase from the bypass main section 22 to the plurality of branch lines 21. The plurality of branch lines 21 are arranged at intervals along the width W2 of the bypass expansion section 23.
[0042] like Figure 4 The bypass flue 2 includes a bypass main section 22, a bypass expansion section 23, and multiple branch lines 21 connected sequentially in a vertical direction. The bypass expansion section 23 extends along... Figure 4 The left and right directions shown (e.g.) Figure 1 The width W2 (shown in the front-to-back direction) is set to increase from top to bottom so that the flue gas supplied by the bypass main section 22 is evenly distributed into multiple branches 21, thereby making the flue gas introduced into the main expansion section 11 by the bypass flue 2 uniform along the width W1 direction of the main expansion section 11.
[0043] Furthermore, the bypass expansion section 23 is provided with multiple bypass guide vanes (not shown in the figure), which are arranged along the width W2 direction of the bypass expansion section 23 (e.g., Figure 4 The left and right directions shown are also as follows Figure 1 The bypass guide plates are arranged at intervals (as shown in the front-to-back direction) and radially from top to bottom. Specifically, the interval between adjacent bypass guide plates is set to increase from top to bottom. Through the cooperation of multiple bypass guide plates and bypass expansion section 23, the flue gas supplied by the bypass main section 22 is evenly distributed to multiple branch lines 21.
[0044] Furthermore, branch 21 is configured to have at least four, preferably four to six.
[0045] In some embodiments, such as Figure 3 As shown, the flue system also includes multiple first guide vanes 4, which are arranged along the width W1 direction of the main expansion section 11 (e.g., Figure 1 The aforementioned front-back direction is also as follows: Figure 3 The first guide plates 4 and the strip openings 3 are arranged alternately in the main expansion section 11 in the vertical direction shown. Along the width W1 of the main expansion section 11, multiple first guide plates 4 are arranged radially to guide the flue gas entering the main expansion section 11 through the strip openings 3.
[0046] It should be noted that, along the flue gas direction, the area where multiple first guide plates 4 are located on the main expansion section 11 can be located downstream of the area where multiple strip openings 3 are located on the main expansion section 11. At this time, the flue gas introduced into the main expansion section 11 by multiple strip openings 3 flows along the flue gas direction and passes through multiple first guide plates 4, thereby being guided by multiple first guide plates 4.
[0047] The areas where multiple first guide plates 4 are located on the main expansion section 11 can also overlap with the areas where multiple strip openings 3 are located on the main expansion section 11 and be opposite to the multiple strip openings 3 in the vertical direction. At this time, the flue gas introduced into the main expansion section 11 by the multiple strip openings 3 is first guided by the multiple first guide plates 4 and then flows in the flue gas direction.
[0048] The first guide plate 4 and the strip opening 3 are arranged alternately along the width W1 direction of the main expansion section 11, so that the flue gas introduced by the strip opening 3 can pass between the adjacent first guide plates 4 and be guided by the adjacent first guide plates 4.
[0049] Multiple first guide plates 4 are arranged radially, which can guide the original flue gas in the main expansion section 11 and the flue gas introduced by multiple strip openings 3, so that the original flue gas and the introduced flue gas are uniform along the width W1 direction of the main expansion section 11, and the original flue gas and the introduced flue gas are fully mixed.
[0050] In some embodiments, the strip opening 3 is disposed between adjacent first guide plates 4.
[0051] like Figure 3 As shown, the areas where multiple first guide plates 4 are located on the main expansion section 11 overlap with the areas where multiple strip openings 3 are located on the main expansion section 11 and are vertically opposite to the multiple strip openings 3. The strip openings 3 are located between adjacent first guide plates 4, so that the space between the strip openings 3 and the adjacent first guide plates 4 is arranged opposite to each other and connected along the thickness T1 direction of the main expansion section 11. The flue gas introduced into the main expansion section 11 by the strip openings 3 first flows along the thickness T1 direction of the main expansion section 11 under the guidance of the adjacent first guide plates 4, so that the introduced flue gas is uniform along the thickness T1 of the main expansion section 11. Then, guided by the adjacent first guide plates 4, it flows along the flue gas direction, so that the introduced flue gas is uniform along the width W1 direction of the main expansion section 11, thereby ensuring that the original flue gas and the introduced flue gas are fully mixed.
[0052] In some embodiments, the width W3 of the strip opening 3 is constant, and the direction of the width W3 of the strip opening 3 (e.g.) Figure 1 The front and back directions shown are also as follows Figure 3 Both ends of the vertical direction shown are provided with corresponding first guide plates 4, and the first guide plates 4 are flush with the edge line of the corresponding end of the corresponding strip opening 3.
[0053] like Figure 3 As shown, the width W3 of the strip opening 3 is constant, and is preferably, but not limited to, a parallelogram shape, so that each strip opening 3 has a shape along the... Figure 3As shown, two vertically spaced side lines are provided, and multiple first guide plates 4 are arranged one-to-one with the side lines of all the strip openings 3. The first guide plates 4 are flush with their corresponding side lines; in other words, the first guide plates 4 are arranged along their corresponding side lines and extend along the thickness T1 direction of the main expansion section 11. This allows the first guide plates 4 to better guide the flue gas introduced into the strip openings 3, thereby ensuring thorough mixing of the original flue gas and the introduced flue gas.
[0054] It should be noted that since the width W3 of the strip opening 3 is constant, the spacing between adjacent first guide plates 4 that are opposite to the strip opening 3 is constant along the flue gas direction, while the spacing between adjacent first guide plates 4 that are not opposite to the strip opening 3 increases along the flue gas direction, so that the multiple first guide plates 4 are arranged radially.
[0055] In some embodiments, such as Figure 3 As shown, the flue system also includes multiple second guide vanes 5, which are arranged along the width W1 direction of the main expansion section 11 (e.g., Figure 1 The aforementioned front-back direction is also as follows: Figure 3 As shown in the vertical direction, multiple second guide plates 5 are arranged radially within the main expansion section 11 along the flue gas direction and are located downstream of multiple first guide plates 4. Specifically, the spacing between adjacent second guide plates 5 increases along the flue gas direction to ensure that the multiple second guide plates 5 are arranged radially. The second guide plates 5 further guide the original flue gas and the introduced flue gas to ensure that the original flue gas and the introduced flue gas are fully mixed and uniform along the width W1 direction of the main expansion section 11.
[0056] The second guide vane 5 can be positioned in a single row, or it can be configured as at least two rows spaced apart along the flue gas direction.
[0057] In some embodiments, the strip-shaped opening 3 is disposed between adjacent first guide plates 4, such as... Figure 3 As shown.
[0058] The first guide plate 4 extends along the thickness T1 direction of the main expansion section 11 and connects at least one end of the main expansion section 11 where the strip-shaped opening 3 is provided, such as Figure 5 As shown, the top of the main expansion section 11 is provided with multiple strip-shaped openings 3. The top of the first guide plate 4 is connected to the top of the main expansion section 11. The bottom of the first guide plate 4 can be connected to the bottom of the main expansion section 11 or it can be suspended in the main expansion section 11. The first guide plate 4 can be set to different lengths according to the working conditions of the flue system so that the flue gas introduced through the first guide plate 4 is uniform along the thickness T1 of the main expansion section 11, ensuring that the original flue gas and the introduced flue gas are fully mixed.
[0059] The second flow guide plate 5 extends along the thickness direction T1 of the main expansion section 11 and is connected between the two ends of the main expansion section 11. As shown in Figure 5 the top end of the second flow guide plate 5 is connected to the top end of the main expansion section 11, and the bottom end of the second flow guide plate 5 is connected to the bottom end of the main expansion section 11, so as to ensure that the original flue gas and the introduced flue gas are fully mixed.
[0060] In the description of the present application, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, 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 devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0061] In addition, the terms "first" and "second" are only used for differentiation and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features referred to. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.
[0062] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected or can communicate with each other; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0063] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.
[0064] In this disclosure, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the present disclosure. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily referred to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, the terminology "comprising" is used in the disclosure as comprising but not limited to, that is, it is open-ended and does not exclude the presence of additional features, structures, materials, or characteristics.
[0065] Although the embodiments of the present disclosure have been shown and described above, it is understood that the above-described embodiments are exemplary, and are not to be interpreted as limiting the present disclosure, and the ordinary skilled in the art can make changes, modifications, replacements, and variations to the above-described embodiments within the scope of the present disclosure.
Claims
1. A flue system, characterized in that, include: The main flue (1) and the bypass flue (2) are provided. The main flue (1) includes a main expansion section (11). The width of the main expansion section (11) is set to increase in the direction of flue gas flowing along the length of the main expansion section (11). The bypass flue (2) includes a plurality of branches (21) arranged at intervals along the width direction of the main expansion section (11). Each branch (21) is connected to the main expansion section (11) and forms a strip opening (3) extending along the length direction of the main expansion section (11). The plurality of strip openings (3) are arranged radially along the flue gas direction.
2. The flue system according to claim 1, characterized in that, One end of the main expansion section (11) in the width direction is straight along the length direction of the main expansion section (11), and the other end of the main expansion section (11) in the width direction is inclined along the length direction of the main expansion section (11). The center line direction of the strip opening (3) forms an angle greater than or equal to zero with the length direction of the main expansion section (11). Along the direction from one end to the other end of the main expansion section (11) in the width direction, the angle of the multiple strip openings (3) increases sequentially.
3. The flue system according to claim 1, characterized in that, Along the flue gas direction, both ends of the main expansion section (11) in the width direction are inclined in a direction away from the center line of the main expansion section (11). The center line direction of the strip opening (3) forms an angle greater than or equal to zero with the length direction of the main expansion section (11). Among the adjacent strip openings (3), the angle of the strip opening (3) that is far from the center line of the main expansion section (11) is greater than the angle of the other strip opening (3) that is adjacent to the center line of the main expansion section (11).
4. The flue system according to claim 2 or 3, characterized in that, The branch (21) connected to the strip opening (3) with an included angle greater than zero includes a straight section (211) and a twisted section (212). The straight section (211) extends along the length direction of the branch (21) and is straight. The twisted section (212) extends along the length direction of the branch (21) and is twisted, and is transitionally connected between the straight section (211) and the strip opening (3).
5. The flue system according to claim 1, characterized in that, The bypass flue (2) further includes a bypass main section (22) and a bypass expansion section (23). The bypass expansion section (23) connects the bypass main section (22) and the multiple branch lines (21). The width of the bypass expansion section (23) is set to increase from the bypass main section (22) to the multiple branch lines (21). The multiple branch lines (21) are arranged at intervals along the width direction of the bypass expansion section (23).
6. The flue system according to any one of claims 1-5, characterized in that, It also includes a plurality of first guide plates (4), which are arranged at intervals in the main expansion section (11) along the width direction. The first guide plates (4) and the strip opening (3) are arranged alternately along the width direction of the main expansion section (11). Along the flue gas direction, the plurality of first guide plates (4) are arranged radially to guide the flue gas entering the main expansion section (11) through the strip opening (3).
7. The flue system according to claim 6, characterized in that, The strip-shaped opening (3) is located between adjacent first guide plates (4).
8. The flue system according to claim 7, characterized in that, The width of the strip opening (3) is constant. Both ends of the strip opening (3) in the width direction are provided with corresponding first guide plates (4), and the first guide plates (4) are flush with the edge line of the corresponding end of the strip opening (3).
9. The flue system according to claim 6, characterized in that, It also includes a plurality of second guide vanes (5), which are arranged at intervals in the main expansion section (11) along the width direction of the main expansion section (11). Along the flue gas direction, the plurality of second guide vanes (5) are arranged radially and are located downstream of the plurality of first guide vanes (4).
10. The flue system according to claim 9, characterized in that, The strip opening (3) is located between adjacent first guide plates (4). The first guide plate (4) extends along the thickness direction of the main expansion section (11) and connects at least one end of the main expansion section (11) where the strip opening (3) is located. The second guide plate (5) extends along the thickness direction of the main expansion section (11) and connects between the two ends of the main expansion section (11).