Low-temperature denitration and cyclone dust removal integrated equipment
By using guide plates and rectifier grilles to adjust the airflow in the low-temperature denitrification cyclone dust removal integrated equipment, combined with flange connections, the problems of ammonia and flue gas mixture escaping and incomplete reaction in the duct were solved, achieving efficient ammonia and catalyst reaction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU XITU ENVIRONMENTAL PROTECTION TECH CO LTD
- Filing Date
- 2025-05-19
- Publication Date
- 2026-05-19
AI Technical Summary
In existing technologies, the low-temperature denitrification equipment and dust removal equipment are set up separately, which makes it easy for the ammonia gas and flue gas mixture to escape during the duct transportation process. The uneven mixing leads to incomplete reaction between ammonia gas and catalyst, resulting in ammonia gas escape.
The low-temperature denitrification cyclone dust removal integrated equipment is adopted. By setting guide plates and rectifier grids at the air inlet of the denitrification reaction device, the airflow direction and uniform flow velocity are adjusted. Combined with flange connection, the air duct transportation is avoided, ensuring that ammonia and catalyst react fully.
It effectively reduces ammonia escape, improves the reaction efficiency between ammonia and catalyst, and avoids the problems of direct escape of ammonia in the duct and incomplete local reaction.
Smart Images
Figure CN224252539U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of environmental protection equipment technology, and in particular relates to a low-temperature denitrification cyclone dust removal integrated equipment. Background Technology
[0002] Low-temperature denitrification technology (operating at 150-300℃) has become the preferred solution for specific industrial scenarios due to its energy-saving and high-efficiency characteristics in gas-fired boilers, coking plants, glass kilns, and waste incineration. Boiler flue gas typically contains high levels of dust, therefore, a combination of electrostatic precipitators, bag filters, and low-temperature selective catalytic regeneration (LT-SCR) processes is commonly used to remove dust and NOx. The SCR reaction requires ammonia to react with NOx in the flue gas under the action of a catalyst to produce nitrogen and water. In low-temperature SCR, if the flue gas temperature is low, the injected ammonia requires more time to mix evenly with the flue gas. Therefore, ammonia needs to be injected before dust removal to complete the mixing process during the dust removal stage. Currently, conventional processes typically have separate dust removal and denitrification equipment connected by ductwork. During the process of transporting the ammonia-flue gas mixture from the dust removal equipment to the denitrification equipment via ductwork, ammonia may escape directly from the ductwork or the ammonia may not react completely with the catalyst in the denitrification equipment, resulting in indirect ammonia escape.
[0003] Therefore, how to prevent ammonia escape when the mixture of flue gas and ammonia passes through dust removal equipment and low-temperature denitrification equipment is a technical problem that urgently needs to be solved by those skilled in the art.
[0004] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Utility Model Content
[0005] This disclosure provides at least one integrated low-temperature denitrification cyclone dust removal device.
[0006] In a first aspect, embodiments of this disclosure provide an integrated low-temperature denitrification cyclone dust removal device, comprising:
[0007] The dust removal device has an air inlet duct on its side wall for introducing dust-laden flue gas, and an air outlet on its top.
[0008] The denitrification reaction device has an air inlet at the bottom and is connected to the exhaust flue at the top;
[0009] The outlet and inlet are connected by a flange, and a catalyst is installed inside the denitrification reaction device. A guide plate and a flow straightening grid are installed between the catalyst and the inlet. The guide plate is inclined towards the side wall of the denitrification reaction device at an angle of 30°-60°.
[0010] In one optional embodiment, the denitrification reactor is provided with at least one mounting position for supporting the catalyst, and the side wall of the denitrification reactor is equipped with a number of acoustic soot blowers matching the mounting position, and the acoustic soot blowers are located below the mounting position.
[0011] In one optional embodiment, an ammonia injection grille is provided inside the air intake duct, and the ammonia injection grille has a plurality of injection holes evenly distributed on it.
[0012] In one alternative embodiment, the air intake duct is radially tangent to the housing of the dust removal device.
[0013] In one optional embodiment, the flow-rectifying grille includes longitudinal plates arranged along the flue gas flow direction and transverse plates perpendicular to the flue gas flow direction, the longitudinal plates and transverse plates being alternately combined to form a grid frame.
[0014] Secondly, this disclosure also provides an integrated low-temperature denitrification cyclone dust removal device, comprising:
[0015] The dust removal device has an air inlet duct on its side wall for introducing dust-laden flue gas, and an air outlet on its top.
[0016] The denitrification reaction device has an air inlet at the bottom that is connected to the air outlet of the dust removal device, and an air outlet flue at the top.
[0017] A flow field control component is installed in the flue gas inlet area of the denitrification reactor to optimize the airflow distribution through flow direction adjustment and flow velocity homogenization.
[0018] The catalyst is located downstream of the flue gas flow of the flow field control component.
[0019] In one optional embodiment, the flow field control component includes a guide vane and a flow straightening grid, wherein the guide vane is inclined toward the side wall of the denitrification reaction device at an angle of 30°-60°.
[0020] The rectifier grid is located between the catalyst and the guide plate.
[0021] In one optional embodiment, an ammonia injection grille is provided inside the air intake duct, and the ammonia injection grille has a plurality of injection holes evenly distributed on it.
[0022] In one alternative embodiment, the air intake duct is radially tangent to the housing of the dust removal device.
[0023] In one optional embodiment, the denitrification reactor is provided with at least one mounting position for supporting the catalyst, and the side wall of the denitrification reactor is equipped with a number of acoustic soot blowers matching the mounting position, and the acoustic soot blowers are located below the mounting position.
[0024] The beneficial effects of this utility model are as follows: the dust removal device and the denitrification reaction device of this low-temperature denitrification cyclone dust removal integrated equipment are directly connected by a flange, eliminating the need to transport the mixed gas of ammonia and flue gas through ducts, thus preventing ammonia from escaping directly in the ducts; in addition, a guide plate and a rectifier grid are installed between the catalyst and the air inlet in the denitrification reaction device. The inclined guide plate directs the high-speed airflow to the edge of the denitrification reaction device, reducing the central velocity of the mixed gas and extending the residence time of the mixed gas in the catalyst layer; the rectifier grid evenly distributes the airflow, allowing the catalyst in all areas to react effectively with ammonia, reducing the indirect escape of ammonia.
[0025] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and drawings.
[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description
[0027] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0028] Figure 1 A structural diagram of a low-temperature denitrification cyclone dust removal integrated device provided in this embodiment of the disclosure;
[0029] Figure 2 This is a schematic diagram of the structure of an ammonia injection grid in a low-temperature denitrification cyclone dust removal integrated device provided in an embodiment of this disclosure;
[0030] Figure 3 This is a top view of a dust removal device in a low-temperature denitrification cyclone dust removal integrated equipment provided in an embodiment of the present disclosure;
[0031] Figure 4 This is a schematic diagram of the structure of the rectifier grid of a low-temperature denitrification cyclone dust removal integrated device provided in an embodiment of this disclosure.
[0032] In the picture:
[0033] 100. Dust removal device; 110. Air outlet; 200. Denitrification reaction device; 210. Air inlet; 220. Catalyst; 230. Flow field control component; 231. Guide plate; 232. Rectifying grid; 2321. Vertical plate; 2322. Horizontal plate; 240. Mounting position; 250. Acoustic soot blower; 300. Flange; 400. Air inlet flue; 410. Ammonia injection grid; 411. Injection hole; 500. Air outlet flue. Detailed Implementation
[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0035] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.
[0036] In this document, when an element or layer is referred to as “located,” “joined to,” “connected to,” “attached to,” or “coupled to” another element or layer, it may be directly located, joined, connected, attached to, or coupled to the other element or layer, or there may be intermediate elements or layers present. Conversely, when an element is referred to as “directly on another element or layer,” “directly joined to,” “directly connected to,” “directly attached to,” or “directly coupled to” another element or layer, there may be no intermediate elements or layers present. Other terms used to describe relationships between elements should be interpreted in a similar manner (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items.
[0037] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.
[0038] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.
[0039] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.
[0040] Research has revealed the following drawbacks of existing technologies: Low-temperature denitrification technology refers to the reaction of ammonia and flue gas mixtures under low-temperature conditions via a catalyst: 4NO + 4NH3 + O2 → 4N2 + 6H2O, ultimately converting the mixture into pollution-free nitrogen and water. In conventional processes, dust removal and denitrification equipment are installed separately and connected by ductwork. During the transport of the ammonia and flue gas mixture from the dust removal equipment to the denitrification equipment via ductwork, aging ductwork can cause ammonia to escape directly. Furthermore, direct transport of the ammonia and flue gas mixture through ductwork can lead to uneven gas flow rates or insufficient mixing, resulting in excessively high flow rates or localized high ammonia concentrations when the mixture enters the denitrification equipment. This incomplete reaction between ammonia and the catalyst in the denitrification equipment leads to indirect ammonia escape.
[0041] Based on the above research, this disclosure provides a low-temperature denitrification cyclone dust removal integrated device. By setting a guide plate and a rectifier grid at the air inlet of the denitrification reaction device, and optimizing the airflow distribution through flow direction adjustment and flow velocity homogenization, the residence time of the mixed gas in the catalyst layer is extended, and the catalyst in all areas can react effectively with ammonia, reducing the indirect escape of ammonia and solving the above problems.
[0042] The shortcomings of the above solutions are the result of the inventor's practical experience and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventor's contribution to this disclosure.
[0043] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0044] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0045] See Figure 1 This disclosure provides a low-temperature denitrification cyclone dust removal integrated device, including: a dust removal device 100, with an inlet flue 400 on its side wall for introducing dust-laden flue gas, and an outlet 110 on its top. A denitrification reaction device 200 is arranged above the dust removal device 100, with an inlet 210 at its bottom and its top connected to the outlet flue 500. The outlet 110 of the dust removal device 100 and the inlet 210 of the denitrification reaction device 200 are connected by a flange 300. The dust-removed mixed gas directly enters the denitrification reaction device 200 from the dust removal device 100, and after being catalyzed by the catalyst 220 in the denitrification reaction device 200, it is converted into pollution-free nitrogen and water, and finally discharged from the outlet flue 500. This process eliminates the need to transport the ammonia and flue gas mixture through ductwork, avoiding the direct escape of ammonia during duct transport.
[0046] See also Figure 1 The denitrification reactor 200 contains a catalyst 220. A guide plate 231 and a flow straightener 232 are positioned between the catalyst 220 and the air inlet 210. The guide plate 231 is inclined towards the side wall of the denitrification reactor 200. The inclined guide plate 231 directs the high-speed airflow to the edge of the denitrification reactor 200, reducing the central velocity of the mixed gas and extending the residence time of the mixed gas in the catalyst 220 layer. The flow straightener 232 evenly distributes the airflow, ensuring that the catalyst 220 in all areas reacts effectively with ammonia, reducing indirect ammonia escape. The inclination angle of the guide plate 231 can be selected from 30° to 60°, preferably 45°.
[0047] See also Figure 1In some embodiments, the denitrification reactor 200 is provided with at least one mounting position 240 for supporting the catalyst 220, and the mounting position 240 is hollowed out. A number of acoustic soot blowers 250, matching the number of mounting positions 240, are installed on the side wall of the denitrification reactor 200, and the acoustic soot blowers 250 are located below the mounting positions 240. The acoustic soot blowers 250 use high-frequency acoustic energy to remove fly ash deposits from the surface of the catalyst 220, preventing blockage at the inlet of the catalyst 220, resulting in a more uniform distribution of the mixed gas in the catalyst 220, and reducing the risk of escape due to uneven contact between the mixed gas and the catalyst 220.
[0048] See Figure 1 and Figure 2 In some embodiments, an ammonia injection grille 410 is provided inside the intake flue 400, and a plurality of injection holes 411 are evenly distributed on the ammonia injection grille 410. The evenly distributed injection holes 411 ensure that the injected ammonia gas is fully mixed with the flue gas, avoiding excessively high or low local ammonia concentrations in the mixed gas.
[0049] See Figure 3 In some embodiments, the intake flue 400 is radially tangent to the housing of the dust removal device 100, so that the mixed gas forms a rotating airflow and enters the dust removal device 100. The mixed gas forms a high-speed rotating vortex inside the dust removal device 100. Due to the centrifugal force, the dust particles are thrown towards the cylinder wall, while the clean mixed gas moves towards the center, forming an upward inner vortex at the center, and is discharged into the denitrification device through the outlet 110.
[0050] Referring to Figure 4, in some embodiments, the rectifier grid 232 includes longitudinal plates 2321 arranged along the flue gas flow direction and transverse plates 2322 perpendicular to the flue gas flow direction. The longitudinal plates 2321 and transverse plates 2322 are alternately combined to form a grid frame. The grid frame divides the flow channel of the mixed gas into multiple small flow units, suppressing uneven lateral diffusion of the mixed gas, and ensuring that the catalyst 220 in all areas can react effectively with ammonia, thereby avoiding incomplete reaction between ammonia and the catalyst 220 in the denitrification equipment, which could lead to indirect ammonia escape.
[0051] See Figure 1 Some embodiments also provide a low-temperature denitrification cyclone dust removal integrated device, including: a dust removal device 100, whose side wall is provided with an inlet flue 400 for introducing dust-laden flue gas, and an outlet 110 at the top; a denitrification reaction device 200, whose bottom is provided with an inlet 210 communicating with the outlet 110 of the dust removal device 100, and whose top is communicating with the outlet flue 500; a flow field control component 230, which is disposed in the flue gas inlet area of the denitrification reaction device 200, for optimizing the airflow distribution by adjusting the flow direction and homogenizing the flow rate; and a catalyst 220, which is disposed downstream of the flue gas flow of the flow field control component 230.
[0052] See also Figure 1 In some embodiments, the flow field control component 230 includes a guide vane 231 and a flow straightener 232. The guide vane 231 is inclined toward the side wall of the denitrification reactor 200 to guide the high-speed airflow to the edge of the denitrification reactor 200. The flow straightener 232 is located between the catalyst 220 and the guide vane 231, which can uniformly distribute the airflow, allowing the catalyst 220 in all areas to react effectively with ammonia and reducing indirect ammonia escape.
[0053] In summary, the dust removal device 100 and the denitrification reaction device 200 of this low-temperature denitrification cyclone dust removal integrated equipment are directly connected via flange 300, eliminating the need to transport the mixed gas of ammonia and flue gas through ducts and preventing ammonia from escaping directly in the ducts. In addition, a guide plate 231 and a rectifier grid 232 are provided between the catalyst 220 and the air inlet 210 in the denitrification reaction device 200. The inclined guide plate 231 directs the high-speed airflow to the edge of the denitrification reaction device 200, reducing the central velocity of the mixed gas and extending the residence time of the mixed gas in the catalyst 220 layer. The rectifier grid 232 evenly distributes the airflow, allowing the catalyst 220 in all areas to react effectively with ammonia, reducing the indirect escape of ammonia.
[0054] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0055] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as the second element, component, region, layer, or segment.
[0056] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.
[0057] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.
[0058] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.
Claims
1. A low-temperature denitrification cyclone dust removal integrated equipment, characterized in that, include: The dust removal device (100) has an air inlet flue (400) on its side wall for introducing dust-laden flue gas and an air outlet (110) on its top. The denitrification reaction device (200) has an air inlet (210) at the bottom and is connected to the exhaust flue (500) at the top; The outlet (110) and inlet (210) are connected by a flange (300), and a catalyst (220) is provided inside the denitrification reaction device (200). A guide plate (231) and a rectifier grid (232) are provided between the catalyst (220) and the inlet (210). The guide plate (231) is inclined toward the side wall of the denitrification reaction device (200) at an angle of 30°-60°.
2. The integrated low-temperature denitrification cyclone dust removal equipment as described in claim 1, characterized in that, The denitrification reaction device (200) is provided with at least one mounting position (240) for supporting the catalyst (220). The side wall of the denitrification reaction device (200) is equipped with a number of acoustic soot blowers (250) matching the mounting position (240), and the acoustic soot blowers (250) are located below the mounting position (240).
3. The integrated low-temperature denitrification cyclone dust removal equipment as described in claim 1, characterized in that, An ammonia injection grille (410) is provided inside the air intake flue (400), and a number of injection holes (411) are evenly distributed on the ammonia injection grille (410).
4. The integrated low-temperature denitrification cyclone dust removal equipment as described in claim 1, characterized in that, The air intake duct (400) is radially tangent to the housing of the dust removal device (100).
5. The integrated low-temperature denitrification cyclone dust removal equipment as described in claim 1, characterized in that, The rectifier grille (232) includes a longitudinal plate (2321) arranged along the flue gas flow direction and a transverse plate (2322) perpendicular to the flue gas flow direction. The longitudinal plate (2321) and the transverse plate (2322) are interleaved to form a grid frame.
6. A low-temperature denitrification cyclone dust removal integrated equipment, characterized in that, include: The dust removal device (100) has an air inlet flue (400) on its side wall for introducing dust-laden flue gas and an air outlet (110) on its top. The denitrification reaction device (200) has an air inlet (210) at its bottom that is connected to the air outlet (110) of the dust removal device (100), and an air outlet flue (500) at its top; A flow field control component (230) is disposed in the flue gas inlet area of the denitrification reaction device (200) for optimizing the airflow distribution by adjusting the flow direction and homogenizing the flow velocity; The catalyst (220) is disposed downstream of the flue gas flow of the flow field control component (230).
7. The integrated low-temperature denitrification cyclone dust removal equipment as described in claim 6, characterized in that, The flow field control component (230) includes a guide plate (231) and a flow straightening grid (232). The guide plate (231) is inclined toward the side wall of the denitrification reaction device (200) at an angle of 30°-60°. The rectifier grille (232) is located between the catalyst (220) and the guide plate (231).
8. The integrated low-temperature denitrification cyclone dust removal equipment as described in claim 6, characterized in that, An ammonia injection grille (410) is provided inside the air intake flue (400), and a number of injection holes (411) are evenly distributed on the ammonia injection grille (410).
9. The integrated low-temperature denitrification cyclone dust removal equipment as described in claim 6, characterized in that, The air intake duct (400) is radially tangent to the housing of the dust removal device (100).
10. The integrated low-temperature denitrification cyclone dust removal equipment as described in claim 6, characterized in that, The denitrification reaction device (200) is provided with at least one mounting position (240) for supporting the catalyst (220). The side wall of the denitrification reaction device (200) is equipped with a number of acoustic soot blowers (250) matching the mounting position (240), and the acoustic soot blowers (250) are located below the mounting position (240).