Silencing device and flue gas conveying system

Abstract

This application provides a silencing device and a flue gas conveying system. The silencing device includes a silencing housing, multiple support members, and multiple sets of silencer assemblies for silencing. The silencing housing has an airflow inlet for flue gas to flow in and an airflow outlet for flue gas to flow out. Multiple support members are disposed inside the silencing housing, and each support member is provided with at least one set of silencer assemblies to achieve noise reduction. The spacing between the silencer assemblies on all adjacent support members is gradually varied according to the airflow velocity distribution. This arrangement allows the flue gas to be re-diverted according to the magnitude of the flue gas resistance between it and the silencer assemblies when passing through the gradually arranged silencer assemblies, thereby making the flue gas velocity distribution more uniform. This avoids local turbulence or eddies caused by uneven flue gas velocity, which could lead to vibration and damage to the silencer assemblies.

Description

Technical Field

[0001] This application relates to the field of flue gas conveying technology, and in particular to a silencing device and a flue gas conveying system. Background Technology

[0002] A flue gas transport system is a system that uses an induced draft fan to transport flue gas into a flue gas path for subsequent flue gas treatment. In actual operation, the induced draft fan generates noise, so a silencer needs to be installed at the fan's exhaust outlet to reduce noise.

[0003] However, the exhaust outlet of the induced draft fan is usually designed with a variable diameter structure, which makes the flue gas velocity distribution at the exhaust outlet uneven (i.e., the flue gas velocity at the bottom may be high, while the flue gas velocity at the top may be low). This can cause some silencers to vibrate and eventually break. Utility Model Content

[0004] The purpose of this application is to provide a silencer and a flue gas conveying system, which aims to solve the problem of how to avoid the silencer being easily damaged by vibration due to uneven airflow velocity distribution, which causes some of the silencers to be impacted by high-speed airflow.

[0005] In a first aspect, embodiments of this application provide a silencing device, including a silencing housing, multiple support members, and multiple sets of silencing assemblies for silencing; The silencing housing is used to be installed in the flue gas path of the flue gas conveying system, and the silencing housing has an airflow inlet for flue gas to flow in and an airflow outlet for flue gas to flow out; a plurality of the support members are installed in the silencing housing and are arranged in parallel at intervals along a direction perpendicular to the flue gas flowing into the silencing housing. Each of the supports is provided with at least one set of the silencer assemblies, and along the arrangement direction of the supports, the spacing between the silencer assemblies on all adjacent supports is gradually set to correspond to the velocity distribution of the airflow flowing through the airflow inlet.

[0006] In some embodiments, the direction in which the flue gas flows into the silencing housing is perpendicular to the height direction of the silencing housing; The airflow velocity gradually decreases along the direction from the bottom to the top of the silencing housing; in all the supports, the distance between the muffler assembly on any one support and the muffler assembly on the adjacent upper support is greater than the distance between the muffler assembly on any one support and the muffler assembly on the adjacent lower support.

[0007] In some embodiments, the muffler assembly includes a plurality of mufflers spaced apart along the length of the support member; The silencer includes a silencer column extending along the direction from the airflow inlet to the airflow outlet. The inner cavity of the silencer column forms a silencer chamber, and the outer wall of the silencer column is provided with a plurality of silencer holes communicating with the silencer chamber.

[0008] In some embodiments, a sound-absorbing reinforcement is provided inside the sound-absorbing cavity, and the sound-absorbing reinforcement is provided with multiple sets of auxiliary sound-absorbing holes communicating with the sound-absorbing cavity.

[0009] In some embodiments, each group of silencers includes at least two silencers, and the silencers in two adjacent groups of silencers are staggered. Each set of auxiliary noise reduction holes includes at least two auxiliary noise reduction holes, and the auxiliary noise reduction holes of two adjacent sets of auxiliary noise reduction holes are staggered. The noise reduction reinforcement is provided in at least two parts, and the at least two noise reduction reinforcements are arranged in a cross manner.

[0010] In some embodiments, the muffler further includes a flow guide disposed at at least one end of the muffler column, wherein the outer wall surface of the flow guide has a gradually increasing tapered structure in the direction along the flow guide to the muffler column.

[0011] In some embodiments, the angle of the tapered structure ranges from 5° to 85°.

[0012] In some embodiments, all the silencers on two adjacent supports are arranged facing each other along the arrangement direction of the supports; The silencers on the same support member are evenly spaced. The silencing cavity is provided with a silencing medium and / or a waterproof medium; The cross-section of the silencing column is square or circular.

[0013] In some embodiments, the silencing housing includes at least two sub-housings connected sequentially along the arrangement direction of the support members; Each of the sub-shells is provided with a hoisting structure; and / or, the outer walls of two adjacent sub-shells are provided with connectors, and the two adjacent connectors are welded and / or screwed together. The sound-absorbing shell has a square or circular cross-section.

[0014] Secondly, embodiments of this application also provide a flue gas conveying system, including an induced draft fan, a flue gas path, and a silencer; The induced draft fan has an induced draft inlet, an induced draft outlet, and a variable diameter outlet. The induced draft outlet is connected to the induced draft inlet, and the variable diameter outlet is connected to both the induced draft outlet and the airflow inlet, so that the flue gas flows into the induced draft fan through the induced draft inlet under the action of the induced draft fan and is transported to the flue gas path through the induced draft outlet, the variable diameter outlet, the airflow inlet, and the airflow outlet.

[0015] The beneficial effects of this utility model are: This application provides a silencing device and a flue gas conveying system. The silencing device includes a silencing housing, multiple support members, and multiple sets of silencer assemblies for silencing. The silencing housing is disposed within the flue gas path of the flue gas conveying system and has an airflow inlet for flue gas to flow in and an airflow outlet for flue gas to flow out, thereby facilitating flue gas flow. Multiple support members are disposed within the silencing housing and are arranged parallel to each other at intervals along a direction perpendicular to the flue gas inflow into the silencing housing. Each support member is provided with at least one set of silencer assemblies to achieve noise reduction.

[0016] Meanwhile, since the flow velocity of flue gas is uneven when it flows into the muffler housing, this application sets the spacing between the muffler components on all adjacent support members to be gradually varied, corresponding to the velocity distribution of the airflow through the air inlet. This arrangement allows the flue gas to be re-diverted according to the magnitude of the flue gas resistance between it and the muffler components when it flows through the gradually arranged muffler components, thereby making the flow velocity distribution of the flue gas more uniform. This avoids the phenomenon of local turbulence or eddies caused by uneven flue gas velocity, which could lead to vibration and damage to the muffler components.

[0017] In other words, by setting a silencer assembly with gradually varying spacing, the flue gas can be re-divided in terms of flow rate, making the flow rate more uniform, so as to avoid vibration damage to the silencer cavity assembly, thereby improving the service life of the silencer assembly and ensuring the reliable operation of the entire flue gas conveying system. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the flue gas conveying system shown in the embodiment of this application; Figure 2 for Figure 1A magnified view of a portion at point A; Figure 3 This is a schematic diagram of the flue gas path and the silencer device shown in the embodiments of this application; Figure 4 for Figure 3 A magnified view of the area at point B; Figure 5 This is a schematic diagram of the structure of the silencing device shown in the embodiment of this application; Figure 6 for Figure 5 A magnified view of the area at point C; Figure 7 This is a schematic diagram of the structure of the silencing housing of the silencing device shown in the embodiment of this application; Figure 8 This is a front view of the muffler column of the muffler device shown in the embodiment of this application; Figure 9 This is a schematic diagram of the structure of a flow guide component of the silencing device shown in the embodiments of this application; Figure 10 This is a side view of the sound-absorbing column shown in an embodiment of this application; Figure 11 This is a schematic diagram of another silencing device shown in an embodiment of this application; Figure 12 This is a schematic diagram of another flow guide component shown in an embodiment of this application.

[0020] Figure label: 100. Silencing device; 110. Silencing housing; 111. Airflow inlet; 112. Airflow outlet; 113. Sub-housing; 114. Lifting structure; 115. Connecting component; 120. Support component; 130. Silencing assembly; 131. Silencing device; 132. Silencing column; 133. Silencing hole group; 134. Silencing reinforcement component; 136. Silencing hole; 140. Flow guide component; 141. Flow guide surface; 150. Silencing medium; 200. Flue gas conveying system; 210. Flue gas path; 220. Exhaust fan; 221. Exhaust inlet; 222. Variable diameter outlet; 310. First fastener; 320. Second fastener. Detailed Implementation

[0021] In the embodiments of this application, the terms "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," "third," "fourth," "fifth," and "sixth" may explicitly or implicitly include one or more of that feature.

[0022] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0023] Reference Figures 1 to 12 As shown, this application embodiment provides a silencing device 100, including a silencing housing 110, multiple support members 120, and multiple sets of silencing assemblies 130 for silencing.

[0024] The silencing housing 110 is used to be installed in the flue gas path 210 of the flue gas conveying system 200, and the silencing housing 110 has an airflow inlet 111 for flue gas to flow in and an airflow outlet 112 for flue gas to flow out; a plurality of support members 120 are installed in the silencing housing 110 and are arranged in parallel at intervals along the direction perpendicular to the flue gas flowing into the silencing housing 110.

[0025] Each support member 120 is provided with at least one set of silencer assemblies 130, and along the arrangement direction of the support members 120, the spacing between all adjacent silencer assemblies 130 on two support members 120 is gradually set to correspond to the velocity distribution of the airflow through the airflow inlet 111.

[0026] In practice, the silencer 100 is installed in the flue gas path 210 of the flue gas conveying device to reduce the noise generated by the induced draft fan 220 of the flue gas conveying device to a certain extent. The specific silencer housing 110 can constitute part of the flue.

[0027] The silencing device 100 specifically includes a silencing housing 110, multiple support members 120, and multiple sets of silencer assemblies 130. The multiple support members 120 are disposed within the silencing housing 110 and are used to support the silencer assemblies 130. The silencer assemblies 130 are used for noise reduction. The noise reduction principle of the silencer assemblies 130 can be resistive noise reduction, reactive noise reduction, impedance composite noise reduction, or micro-perforated plate noise reduction, etc., and the specific method can be selected according to actual needs.

[0028] For example, the support member 120 can be a support rod or a support frame. The support member 120 is connected to the muffler assembly 130 by a first fastener 310, welding, or snap-fit ​​connection to ensure reliable load-bearing of the muffler assembly 130. For example, the first fastener 310 can be a bolt or a screw. The support member 120 can be welded to or snap-fitted to the muffler housing 110.

[0029] For example, the support member 120 can be configured as follows: Figure 5 The seven shown can be configured with a set of silencer components 130 on each support 120, or the support 120 can be configured with three, four, five, etc. The specific number of support 120 is determined according to the cross-sectional area of ​​the flue gas flow.

[0030] For example, the sound-absorbing housing 110 can be as follows: Figure 11 The circular shell shown may be, for example, as... Figure 7 The square outer shell shown, namely the sound-absorbing shell 110, can have a circular or square cross-section.

[0031] Specifically, the support members 120 are arranged parallel to each other in a direction perpendicular to the direction in which the flue gas flows into the silencer housing 110. This arrangement allows the silencer assembly 130 installed on each support member 120 to cover a larger airflow area, so as to achieve subsequent uniform airflow operation.

[0032] For example, refer to Figure 1 As shown, when the flue gas flows into the muffler housing 110 in a horizontal direction (including from left to right or from right to left), all the support members 120 are spaced apart in a vertical direction perpendicular to the horizontal direction, and the spacing between adjacent support members 120 is gradually set according to the airflow velocity distribution. This allows the spacing between the muffler assemblies 130 on adjacent support members 120 to be gradually set according to the airflow velocity distribution, thereby achieving uniform airflow operation, that is, re-dividing the airflow velocity to make the airflow velocity more uniform.

[0033] The specific structural principle of uniform airflow velocity is illustrated with the following example: For instance, when the flow direction of the flue gas is as follows... Figure 3 When the flow rate of the flue gas gradually decreases from bottom to top in the left-right direction as shown, the support members 120 can be arranged vertically, and the spacing between adjacent support members 120 gradually increases from bottom to top. Figure 3The gradual setting is not shown in the text; it is only used to illustrate the relationship between the arrangement of the silencer assembly 130 and the flow rate of the flue gas (the specific meaning can be understood from the text description). This makes the resistance of the flue gas greater in the bottom space and less in the upper space when it flows through the silencer housing 110. This allows the flow rate of the flue gas to be redistributed under the action of different resistances, thereby making the final flow rate of the flue gas more uniform.

[0034] For example, when the direction of smoke flow is as follows: Figure 1 When the flow rate of the flue gas gradually increases from bottom to top in the left-right direction as shown, the support members 120 can be arranged vertically, and the distance between adjacent support members 120 gradually decreases from bottom to top. This makes the resistance of the flue gas in the bottom space less and the resistance greater when flowing through the upper space when the flue gas flows through the silencing shell 110. This allows the flow rate of the flue gas to be redistributed under the action of different resistances, thereby making the final flow rate of the flue gas more uniform.

[0035] Similarly, when the flue gas flows vertically and its velocity gradually decreases from left to right, the support members 120 can be arranged horizontally, with the spacing between adjacent support members 120 gradually increasing from left to right. This results in greater resistance to the flue gas in the left space and less resistance in the right space when the flue gas flows through the silencing shell 110. This allows the flue gas velocity to be redistributed under different resistances, resulting in a more uniform flue gas velocity.

[0036] Of course, in a special case, if the airflow velocity itself is relatively uniform, the spacing between adjacent support members 120 can also be set to be consistent.

[0037] The silencing device 100 of this embodiment includes a silencing housing 110, multiple support members 120, and multiple sets of silencer assemblies 130 for silencing. The silencing housing 110 is disposed within the flue gas path 210 of the flue gas conveying system 200, and has an airflow inlet 111 for flue gas to flow in and an airflow outlet 112 for flue gas to flow out, thus facilitating flue gas flow. The multiple support members 120 are disposed within the silencing housing 110 and are arranged parallel to each other at intervals along a direction perpendicular to the flue gas inflow into the silencing housing 110. Each support member 120 is provided with at least one set of silencer assemblies 130 to achieve noise reduction.

[0038] Meanwhile, since the flow rate of flue gas is uneven when it flows into the muffler housing 110, in this embodiment, the spacing between the muffler assemblies 130 on all two adjacent support members 120 is set in a gradually changing manner corresponding to the flow rate distribution of the airflow. This arrangement allows the flue gas to be re-diverted according to the magnitude of the flue gas resistance between it and the muffler assembly 130 when it flows through the gradually arranged muffler assembly 130, thereby making the flow rate distribution of the flue gas more uniform. This can avoid the phenomenon of local turbulence or eddies caused by uneven flue gas flow rate, which could lead to vibration and damage to the muffler assembly 130.

[0039] In other words, in this embodiment, by setting the silencer assembly 130 with gradually varying spacing, the flue gas can be re-divided in terms of flow rate, making the flow rate more uniform, so as to avoid vibration damage to the silencer assembly 130, thereby improving the service life of the silencer assembly 130 and ensuring the reliable operation of the entire flue gas conveying system 200.

[0040] Reference Figures 1 to 5 As shown, in some embodiments, the direction in which the flue gas flows into the silencing housing 110 is perpendicular to the height direction of the silencing housing 110; The airflow velocity gradually decreases along the direction from the bottom to the top of the muffler housing 110; among all the supports 120, the distance between the muffler assembly 130 on any one support 120 and the muffler assembly 130 on the adjacent upper support 120 is greater than the distance between the muffler assembly 130 on any one support 120 and the muffler assembly 130 on the adjacent lower support 120.

[0041] In this embodiment, the flow direction of the flue gas can be set to along Figure 3As shown in the left-right direction, the support members 120 are arranged parallel and spaced vertically. The airflow velocity through the airflow inlet 111 gradually decreases from bottom to top, meaning the airflow velocity is high at the bottom and low at the top. The distance between any muffler assembly 130 on any support member 120 and the muffler assembly 130 on the adjacent upper support member 120 can be greater than the distance between any muffler assembly 130 on any support member 120 and the muffler assembly 130 on the adjacent lower support member 120. In other words, the distance between adjacent support members 120 gradually increases from bottom to top. This further increases the distance between the muffler assemblies 130 on adjacent support members 120, resulting in greater resistance to the flue gas in the bottom space and less resistance in the upper space when the flue gas flows through the muffler housing 110. This allows the flue gas velocity to be redistributed under different resistances, resulting in a more uniform final flue gas velocity.

[0042] For example, the velocity of the flue gas gradually decreases from bottom to top. Counting from bottom to top, the distance between the first support member 120 and the second support member 120 is S1, the distance between the second support member 120 and the third support member 120 is S2, the distance between the third support member 120 and the fourth support member 120 is S3, and the distance between the (n-1)th support member 120 and the nth support member 120 (the topmost support member) is S... n-1 At this time S n-1 ...S3>S2>S1. At this time, the distance between the first group of muffler assemblies 130 and the second group of muffler assemblies 130 is T1, the distance between the second group of muffler assemblies 130 and the third group of muffler assemblies 130 is T2, the distance between the third group of muffler assemblies 130 and the fourth group of muffler assemblies 130 is T3, and the distance between the (n-1)th group of muffler assemblies 130 and the nth group of muffler assemblies 130 (the topmost group of muffler assemblies) is T... n-1 At this time T n-1 >……T3>T2TS1.

[0043] Reference Figure 5 As shown, in some embodiments, the muffler assembly 130 includes a plurality of mufflers 131 spaced apart along the length of the support member 120; the muffler 131 includes a muffler column 132 extending along the direction from the airflow inlet 111 to the airflow outlet 112, the inner cavity of the muffler column 132 forms a muffler cavity, and a plurality of muffler hole groups 133 communicating with the muffler cavity are provided on the outer wall of the muffler column 132.

[0044] Specifically, when the flue gas flows into the silencer housing 110, the airflow velocity can be evenly distributed under the action of multiple silencer columns 132 with gradual settings. For details, please refer to the description above, which will not be repeated here.

[0045] In this embodiment, the muffler 131 includes a muffler column 132, which has a group of muffler holes 133 communicating with the muffler cavity. Utilizing the acoustic characteristics of the muffler column 132 with the group of muffler holes 133, when sound waves are incident on the group of muffler holes 133 on the muffler column 132, the sound energy is converted into heat energy due to friction and damping, thereby achieving noise reduction. Furthermore, the muffler 131 of this embodiment has advantages such as simple structure, low cost, and good noise reduction effect.

[0046] For example, each set of muffler assemblies 130 may have two mufflers 131, or three, four, five mufflers 131, etc.

[0047] Reference Figure 10 As shown, in some embodiments, a noise reduction reinforcement 134 is provided inside the noise reduction cavity, and the noise reduction reinforcement 134 is provided with multiple sets of auxiliary noise reduction holes communicating with the noise reduction cavity.

[0048] In practice, the silencing reinforcement 134, which is placed inside the silencing cavity, can also play a role in structural strength of the silencing column 132, that is, to improve the rigidity of the muffler 131. This can also increase the silencing circumference of the silencing column 132, thereby increasing the silencing volume.

[0049] Furthermore, in this embodiment, the stiffness of the muffler 131 is improved by setting staggered silencing holes 136 and silencing reinforcement 134, while the uniformity of the flue gas velocity is improved by using the gradually arranged muffler assembly 130. The combined effect of the two can effectively improve the vibration resistance of the muffler assembly 130 and prevent the muffler assembly 130 from vibrating and breaking.

[0050] Reference Figure 5 As shown, in some embodiments, each group of silencing holes 133 includes at least two silencing holes 136. The silencing holes 136 of two adjacent groups of silencing holes 133 are staggered. The staggered silencing holes 136 can make the silencing column 132 more rigid without affecting the silencing effect.

[0051] Specifically, when multiple sets of silencer hole groups 133 are set, the interior angle β of the triangular structure formed by the three adjacent silencer holes 136 of two adjacent columns of silencer hole groups 133 can be 60° or other angles.

[0052] Accordingly, each set of auxiliary silencing holes includes at least two auxiliary silencing holes. The auxiliary silencing holes of two adjacent sets of auxiliary silencing holes are staggered. The staggered auxiliary silencing holes can make the silencing column 132 more rigid without affecting the silencing effect.

[0053] Reference Figure 10As shown, in some embodiments, at least two noise-reducing reinforcement members 134 are provided, and the at least two noise-reducing reinforcement members 134 are arranged crosswise, so that multiple noise-reducing reinforcement members 134 are connected into a whole and connected to the noise-reducing column 132, which can further improve the rigidity and structural strength of the entire muffler 131.

[0054] For example, the noise reduction reinforcement 134 can be a reinforcement plate adapted to the length of the noise reduction column 132, or it can be a reinforcement block or a reinforcing rib provided on the inner wall of the noise reduction column 132.

[0055] For example, the silencing reinforcement 134 and the silencing post 132 can be welded or snapped together.

[0056] Reference Figure 8 As shown, in some embodiments, the muffler 131 further includes at least one guide member 140, which is disposed at at least one end of the muffler column 132. In the direction from the guide member 140 to the muffler column 132, the guide member 140 has a tapered structure with a gradually increasing inner cavity.

[0057] In practice, in order to guide or direct the flue gas, a guide member 140 can be provided at at least one end of the silencer column 132. The guide member 140 has a tapered structure with gradually increasing outer wall surface along the direction from the guide member 140 to the silencer column 132. That is, the outer surface of the guide member 140 is the guide surface 141, so as to guide the flue gas and thus minimize the impact of the silencer 131 on the flue gas flow field.

[0058] For example, the angle range of the conical structure is 5°-85°. By reasonably setting the angle range of the conical structure, reliable guidance of flue gas can be ensured, so as to minimize the impact on the flue gas flow field.

[0059] For example, the range of the cone angle can be 5°, 30°, 60° or 85°.

[0060] Furthermore, the outer contour of the guide 140 can be as follows: Figure 9 The square pyramid structure shown can also be shaped like... Figure 12 The multi-sided structure (with more than four edges) or the frustum-shaped structure shown.

[0061] Reference Figure 5 As shown, in some embodiments, all the silencers 131 on two adjacent supports 120 are arranged facing each other along the arrangement direction of the supports 120, so that the arrangement of the entire silencer 131 is not only more regular, but also reduces the influence of the silencer 131 on the flue gas flow field to a certain extent.

[0062] Similarly, the silencers 131 on the same support 120 are evenly spaced, which makes the arrangement more aesthetically pleasing and is conducive to uniform airflow of flue gas.

[0063] For example, the silencing cavity is provided with a silencing medium 150 and / or a waterproof medium. For instance, only the silencing medium 150 can be provided in the silencing cavity to further improve the silencing effect, or a waterproof medium can be provided in the silencing cavity to achieve a waterproof function, or both the silencing medium 150 and the waterproof medium can be provided in the silencing cavity at the same time.

[0064] For example, the sound-absorbing medium 150 can be glass wool, rock wool, etc. The waterproof medium can be waterproof cloth or waterproof film.

[0065] For example, the cross-section of the muffler column 132 is square or circular. For instance, the muffler column 132 can be a rectangular muffler column or a cylindrical muffler column. The shape of the muffler column and the shape of the muffler housing can be combined. For example, a cylindrical muffler housing 110 and a rectangular muffler column 132 can be used, or a rectangular muffler housing 110 and a cylindrical muffler column 132 can be used, or both the muffler column 132 and the muffler housing 110 can be cylindrical or both can be rectangular.

[0066] Reference Figure 7 As shown, in some embodiments, the silencing housing 110 includes at least two sub-housings 113 connected sequentially along the arrangement direction of the support members 120. This allows for the selection of different numbers of sub-housings 113 for splicing according to the actual required volume or height of the silencing housing 110, thereby achieving modular assembly and shortening on-site installation time.

[0067] For example, sub-shell 113 may include two or three.

[0068] In practice, a hoisting structure 114 is provided on any of the sub-shells 113 to facilitate lifting and transportation. For example, the hoisting structure 114 can be provided on the uppermost sub-shell 113, which makes hoisting operations easier.

[0069] The hoisting structure 114 can be, for example, a hook or a ring.

[0070] In addition, four hoisting structures 114 can be set up at the four corners of the sub-shell 113 to facilitate transfer and improve installation and transportation efficiency.

[0071] Specifically, each of the two adjacent sub-shells 113 has a connector 115 on its outer wall, and the two adjacent connectors 115 are welded and / or screwed together.

[0072] For example, the connector 115 can be an angle steel. After two angle steels are fitted together, they can be aligned and welded together using the second fastener 320, or they can be directly connected using the second fastener 320, or they can be directly welded, thereby achieving a reliable connection between the two sub-shells 113. For example, the second fastener 320 can specifically be a bolt or a fastening pin.

[0073] Reference Figures 1 to 12 As shown in the figure, this application embodiment also provides a flue gas conveying system 200, including an induced draft fan 220, a flue gas path 210, and a silencer 100.

[0074] The induced draft fan 220 has an induced draft inlet 221, an induced draft outlet, and a variable diameter outlet 222. The induced draft outlet is connected to the induced draft inlet 221, and the variable diameter outlet 222 is connected to both the induced draft outlet and the airflow inlet 111, so that the flue gas flows into the induced draft fan 220 through the induced draft inlet 221 under the action of the induced draft fan 220 and is transported to the flue gas path 210 through the induced draft outlet, the variable diameter outlet 222, the airflow inlet 111, and the airflow outlet 112.

[0075] The specific structure and implementation principle of the silencing device 100 in this embodiment are the same as those of the silencing device 100 provided in the above embodiments, and can bring the same or similar technical effects. They will not be described in detail here, but can be referred to the description of the above embodiments.

[0076] In practice, the induced draft fan 220 draws the flue gas into the induced draft inlet 221 under the suction or draft of the induced draft fan 220, and finally delivers it to the flue gas path 210 through the induced draft outlet, the variable diameter outlet 222, and the silencer housing 110. The specific flow path of the flue gas can be referred to... Figure 1 As shown by the arrow in the diagram. At the same time, the noise reduction device 100 in the flue gas path 210 is used to reduce the noise of the induced draft fan 220 during operation, so as to avoid excessive noise causing a bad user experience.

[0077] Typically, the outlet section of the induced draft fan 220 is configured as a variable diameter outlet 222. For example, the lower half of the outlet section can be flush with the bottom surface of the induced draft fan 220, while the upper half is a conical section inclined away from the lower half along the flow direction of the flue gas, thereby expanding the air outlet area. However, such a configuration will cause the flow velocity of the flue gas at the bottom to be significantly higher than that at the top when the flue gas flows out through the variable diameter outlet 222. When the flue gas has an uneven flow velocity, when the uneven flue gas flows through the silencer 100, the uneven flow velocity will form turbulence or vortex zones in local areas of the silencer assembly 130. The airflow pressure pulsates violently in these areas, generating periodic impact forces on the silencer assembly 130 (such as the silencer reinforcement 134, the silencer medium 150, or the silencer column 132). Long-term action will cause fatigue cracks or damage.

[0078] Therefore, in this embodiment, the silencer assembly 130 is configured with a gradual change corresponding to the airflow velocity distribution. For example, when the flue gas flow direction is as follows... Figure 3 When the flow rate of the flue gas gradually decreases from bottom to top in the left-right direction as shown, the support members 120 can be arranged vertically, and the spacing between adjacent support members 120 gradually increases from bottom to top. Figure 3 The gradual setting is not shown in the text; it is only used to illustrate the relationship between the arrangement of the silencer assembly 130 and the flow rate of the flue gas (the specific meaning can be understood from the text description). This makes the resistance of the flue gas greater in the bottom space and less in the upper space when it flows through the silencer housing 110. This allows the flow rate of the flue gas to be redistributed under the action of different resistances, thereby making the final flow rate of the flue gas more uniform.

[0079] For example, when the direction of smoke flow is as follows: Figure 3 When the flue gas velocity gradually increases from bottom to top in the left-right direction as shown, the support members 120 can be arranged in the vertical direction, and the spacing between adjacent support members 120 gradually decreases from bottom to top. Figure 3 The gradual setting is not shown in the text; it is only used to illustrate the relationship between the arrangement of the silencer assembly 130 and the flow rate of the flue gas (the specific meaning can be understood from the text description). This makes the resistance of the flue gas less in the bottom space and greater in the upper space when it flows through the silencer housing 110. This allows the flow rate of the flue gas to be redistributed under the action of different resistances, thereby making the final flow rate of the flue gas more uniform.

[0080] Similarly, when the flue gas flows vertically and its velocity gradually decreases from left to right, the support members 120 can be arranged horizontally, with the spacing between adjacent support members 120 gradually increasing from left to right. This results in greater resistance to the flue gas in the left space and less resistance in the right space when the flue gas flows through the silencing shell 110. This allows the flue gas velocity to be redistributed under different resistances, resulting in a more uniform flue gas velocity.

[0081] In the description of the embodiments of this application, specific features, structures, materials or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0082] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A noise reduction device, characterized in that, It includes a silencing housing (110), multiple support members (120), and multiple sets of silencer assemblies (130) for silencing. The silencing housing (110) is used to be installed in the flue gas path (210) of the flue gas conveying system (200), and the silencing housing (110) has an airflow inlet (111) for flue gas to flow in and an airflow outlet (112) for flue gas to flow out; a plurality of the support members (120) are installed in the silencing housing (110) and are arranged in parallel at intervals along a direction perpendicular to the flow of flue gas into the silencing housing (110); Each of the support members (120) is provided with at least one set of the silencer assemblies (130), and along the arrangement direction of the support members (120), the spacing between all adjacent two support members (120) of the silencer assemblies (130) is gradually set in a manner corresponding to the velocity distribution of the airflow flowing into the silencer housing (110).

2. The silencing device according to claim 1, characterized in that, The direction in which the flue gas flows into the silencing shell (110) is perpendicular to the height direction of the silencing shell (110); The airflow velocity gradually decreases in the direction from the bottom to the top of the silencing housing (110); In all of the supports (120), the distance between the muffler assembly (130) on any one support (120) and the muffler assembly (130) on the adjacent upper support (120) is greater than the distance between the muffler assembly (130) on any one support (120) and the muffler assembly (130) on the adjacent lower support (120).

3. The silencing device according to claim 1, characterized in that, The muffler assembly (130) includes a plurality of mufflers (131) spaced apart along the length of the support (120); The silencer (131) includes a silencer column (132) extending along the direction from the airflow inlet (111) to the airflow outlet (112). The inner cavity of the silencer column (132) forms a silencer cavity, and the outer wall of the silencer column (132) is provided with a plurality of silencer hole groups (133) communicating with the silencer cavity.

4. The silencing device according to claim 3, characterized in that, The silencing cavity is provided with a silencing reinforcement member (134), and the silencing reinforcement member (134) is provided with a plurality of auxiliary silencing holes that communicate with the silencing cavity.

5. The silencing device according to claim 4, characterized in that, Each group of silencer holes (133) includes at least two silencer holes (136), and the silencer holes (136) of two adjacent groups of silencer holes (133) are staggered. Each set of auxiliary noise reduction holes includes at least two auxiliary noise reduction holes, and the auxiliary noise reduction holes of two adjacent sets of auxiliary noise reduction holes are staggered. At least two noise-reducing reinforcement members (134) are provided, and at least two noise-reducing reinforcement members (134) are arranged crosswise.

6. The silencing device according to claim 3, characterized in that, The muffler (131) further includes a guide (140) disposed at at least one end of the muffler column (132), wherein the outer wall of the guide (140) has a gradually increasing conical structure in the direction from the guide (140) to the muffler column (132).

7. The silencing device according to claim 6, characterized in that, The angle range of the conical structure is 5°-85°.

8. The silencing device according to claim 3, characterized in that, All the silencers (131) on two adjacent supports (120) are arranged facing each other along the arrangement direction of the supports (120); The silencers (131) on the same support member (120) are evenly spaced; The silencing cavity is provided with a silencing medium (150) and / or a waterproof medium; The cross-section of the silencing column (132) is square or circular.

9. The silencing device according to claim 1, characterized in that, The sound-absorbing housing (110) includes at least two sub-housings (113) connected sequentially along the arrangement direction of the support (120). A hoisting structure (114) is provided on any of the sub-shells (113); and / or, a connector (115) is provided on the outer wall of two adjacent sub-shells (113), and the two adjacent connectors (115) are welded and / or screwed together; The cross-section of the sound-absorbing shell (110) is square or circular.

10. A flue gas conveying system, characterized in that, It includes an induced draft fan (220), a flue gas path (210), and a silencer (100) as described in any one of claims 1 to 9. The induced draft fan (220) has an induced draft inlet (221), an induced draft outlet, and a variable diameter outlet (222). The induced draft outlet is connected to the induced draft inlet (221), and the variable diameter outlet (222) is connected to the induced draft outlet and the airflow inlet (111) respectively, so that the flue gas flows into the induced draft fan (220) through the induced draft inlet (221) under the action of the induced draft fan (220) and is transported to the flue gas path (210) through the induced draft outlet, the variable diameter outlet (222), the airflow inlet (111), and the airflow outlet (112).

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