A device for uniform distribution of raw flue gas in a desulfurization tower
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DATANG ENVIRONMENT IND GRP
- Filing Date
- 2025-06-26
- Publication Date
- 2026-08-07
AI Technical Summary
[0008]本实用新型的目的在于提供一种脱硫塔原净烟道烟气均布装置，该装置能够有效解决脱硫烟气系统中烟气速度分布不均、系统阻力不合理以及现有方案存在局限性的问题，提升了脱硫系统的整体性能
[0021]1.在原烟道和净烟道加装导流和均流组件，能够有效解决了脱硫烟气系统中烟气速度分布不均、系统阻力不合理以及现有方案存在局限性的问题，提升了脱硫系统的整体性能；
Smart Images
Figure CN224599049U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of limestone wet flue gas desulfurization technology, and in particular to a flue gas uniform distribution device for the original and clean flue gas duct of a desulfurization tower. Specifically, it is a device for uniformly distributing flue gas before and after desulfurization in the flue gas duct, eliminating local differences in flow velocity and concentration, and optimizing the flue gas flow state. Background Technology
[0002] In the production process of coal-fired power plants, the flue gas desulfurization system is a crucial link in controlling sulfur dioxide emissions. As the core equipment, the flue gas flow state directly affects the desulfurization efficiency within the absorption tower and the uniformity of the desulfurized flue gas distribution. If the raw flue gas entering the absorption tower has a large velocity deviation within the flue, it will lead to localized low desulfurization efficiency. Furthermore, if the velocity and concentration fields of the flue gas entering the clean flue after passing through the absorption tower are uneven, the CEMS measurement data of the clean flue gas will be unrepresentative, and the atmospheric pollutant emission values will not reflect the true operating status of the environmental protection equipment.
[0003] Ideally, the flue gas in the original clean flue should be evenly distributed to ensure the efficient operation of subsequent equipment and reduce the risk of localized corrosion and scaling. However, in actual operation, the original clean flue gas is affected by the upstream production system, resulting in uneven flow rate, concentration differences, and uneven humidity distribution in the treated flue gas. This seriously affects the normal operation, service life, desulfurization efficiency, and cost of the desulfurization system.
[0004] Currently, the existing technologies mainly address the issue of uniform distribution of flue gas within the raw and clean flue gas ducts of desulfurization absorption towers through the following solutions:
[0005] I. Guide Plate Solution: A fixed guide plate is installed inside the flue. The angle of the guide plate is adjusted to change the direction of flue gas flow, promoting uniform distribution of flue gas. However, this solution has obvious drawbacks. The fixed angle of the guide plate is difficult to adapt to changes in flue gas flow rate and velocity under different operating conditions, and the uniform distribution effect decreases significantly when the flue gas flow rate fluctuates.
[0006] II. Perforated Plate Flow Distribution Scheme: Perforated plates are installed in the clean flue to ensure uniform flow of flue gas through the throttling effect. While this scheme can improve flue gas distribution to some extent, the excessive resistance of the perforated plates affects the safe operation of thermal power units, increases energy consumption costs, and also impacts the load capacity of the units.
[0007] In summary, existing flue gas uniform distribution schemes have shortcomings in terms of adaptability, energy consumption control, maintenance costs, and uniform distribution effect. There is an urgent need for a flue gas uniform distribution device for the raw and clean flue gas ducts of desulfurization towers that is simple in structure, highly adaptable, and has a stable uniform distribution effect, so as to meet the actual needs of efficient flue gas treatment in thermal power plants. Utility Model Content
[0008] The purpose of this invention is to provide a flue gas uniform distribution device for the original clean flue gas duct of a desulfurization tower. This device can effectively solve the problems of uneven flue gas velocity distribution, unreasonable system resistance, and limitations of existing solutions in the desulfurization flue gas system, thereby improving the overall performance of the desulfurization system.
[0009] This utility model provides a flue gas uniform distribution device for the original clean flue of a desulfurization tower, including: a first flow guiding component installed in the original flue at the front end of the desulfurization tower, the first flow guiding component including multiple arc-shaped flow guiding plates arranged at the outlet bend of the induced draft fan, the inlet bend of the original flue, and the outlet bend of the original flue.
[0010] The second flow guiding component and the flow equalization component are installed in the clean flue gas duct at the rear end of the desulfurization tower. The second flow guiding component includes multiple zigzag flow guiding plates arranged at the first bend near the outlet of the desulfurization tower and multiple zigzag flow guiding plates at the second bend. The flow equalization component is arranged on the rear side of the second bend near the outlet of the desulfurization tower and in front of the clean flue gas measuring point. The flow equalization component is a flow equalization net with holes evenly distributed on its surface.
[0011] Preferably, the inlet of the original flue is connected to two sets of induced draft fan outlet bends, and two symmetrical arc-shaped guide plates are respectively arranged in the two sets of induced draft fan outlet bends, and a straight guide plate is arranged on the symmetrical line of the four arc-shaped guide plates.
[0012] Preferably, the adjacent arc-shaped guide vanes and the adjacent zigzag guide vanes are arranged at uniform intervals.
[0013] Preferably, each of the arc-shaped guide vanes and the zigzag guide vanes is bent or folded toward the center of the arc or one side of the inner angle of the bend at the bend.
[0014] Preferably, the radius of the arc of the arc-shaped guide vane and the bending angle of the zigzag guide vane are the same as the radius of the arc or the bending angle at the bend.
[0015] Preferably, the number of arc-shaped guide vanes at each bend is 2 to 3.
[0016] Preferably, the number of the zigzag guide vanes at each bend is 4 to 8, and each zigzag guide vane is formed by connecting two flat plates, with the included angle between the two flat plates being an obtuse angle.
[0017] Preferably, the flow equalization network is formed by welding multiple horizontal rectangular steel pipes and vertical rectangular steel pipes perpendicularly together.
[0018] Preferably, the flow equalization net is arranged perpendicular to the direction of flue gas flow in the clean flue.
[0019] Preferably, each end of the flow equalization net is welded to the interior of the clean flue or detachably connected by bolts.
[0020] Compared with the prior art, the present invention has the following beneficial effects:
[0021] 1. Adding flow guiding and flow equalization components to the original flue and clean flue can effectively solve the problems of uneven flue gas velocity distribution, unreasonable system resistance and the limitations of existing solutions in the desulfurization flue gas system, thereby improving the overall performance of the desulfurization system;
[0022] 2. For a 660MW thermal power unit, under 300MW and 600MW operating conditions, without the addition of flow guiding and flow equalization devices, the relative standard deviation of the cross-sectional velocity of the original and clean flue gas is relatively large. This utility model adds flow guiding plates with specific parameters to the original flue gas duct at the bend at the outlet of the induced draft fan, the confluence of the induced draft fan outlet flue gas duct, and the bend before the inlet of the desulfurization tower. The clean flue gas duct adds flow guiding plates to the bend at the outlet of the desulfurization tower and installs flow equalization nets at specific locations. After the modification, under the 300MW operating condition, the relative standard deviation of the cross-sectional velocity of the original flue gas decreased from 22.61% to 13.87%, and the relative standard deviation of the cross-sectional velocity of the clean flue gas decreased from 58.13% to 14.87%. Under the 600MW operating condition, the relative standard deviation of the cross-sectional velocity of the original flue gas decreased from 20.05% to 12.77%, and the relative standard deviation of the cross-sectional velocity of the clean flue gas decreased from 55.67% to 14.94%, meeting the design requirements, making the flue gas flow more evenly in the flue gas duct, and improving the processing efficiency of subsequent equipment.
[0023] 3. Optimize system resistance: Before optimization, the differential pressure of flue gas inlet and outlet in the original system under the 300MW and 600MW operating conditions was 506Pa and 1143Pa, respectively. After optimization, the differential pressure under the 300MW operating condition was reduced to 477Pa and the differential pressure under the 600MW operating condition was reduced to 1117Pa. While improving the uniformity of flue gas distribution, the system resistance was reduced, the energy consumption of equipment such as induced draft fans was reduced, the operating cost was reduced, and the system stability and reliability were improved.
[0024] 4. The project implementation difficulty and overall benefits are more advantageous: The project difficulty of this utility model is relatively moderate. While ensuring a good uniform distribution effect and reducing system resistance, it avoids excessive project volume and construction difficulty, resulting in higher overall benefits and making it more conducive to promotion and application in actual projects. Attached Figure Description
[0025] 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.
[0026] Figure 1 This is a schematic diagram showing the arrangement of the device of this utility model in the desulfurization tower;
[0027] Figure 2 This is a schematic diagram showing the specific structure of each part of the device of this utility model;
[0028] Explanation of reference numerals in the attached figures:
[0029] 1: Desulfurization tower; 2: Original flue; 3: Arc-shaped guide plate; 4: Clean flue; 5: Broken-line guide plate; 6: Flow equalization network; 7: Straight guide plate. Detailed Implementation
[0030] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. 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.
[0031] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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.
[0032] Furthermore, the terms "first" and "second" 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 as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" 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; 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.
[0033] like Figure 1 , 2 As shown, this utility model discloses a flue gas uniform distribution device for the original clean flue gas duct of a desulfurization tower, comprising: a first flow guiding component disposed in the original flue gas duct 2 at the front end of the desulfurization tower 1, the first flow guiding component comprising a component disposed at the bend of the induced draft fan outlet ( Figure 1, 2 (Location ① in the middle), at the bend of the original flue inlet ( Figure 1 , 2 (at position ② in the middle) and at the bend of the original flue outlet ( Figure 1 , 2 Multiple arc-shaped guide vanes 3 at position ③ in the middle;
[0034] The second flow guiding component and the flow equalization component are installed in the clean flue duct 4 at the rear end of the desulfurization tower 1, wherein the second flow guiding component includes a first bend located near the outlet of the desulfurization tower 1. Figure 1 , 2 Multiple zigzag guide vanes 5 at position ④ in the middle and at the second bend ( Figure 1 , 2 Multiple zigzag guide plates 5 (located at position ⑤) and flow equalization components are positioned near the second bend after the outlet of desulfurization tower 1 and before the clean flue gas measuring point. Figure 1 , 2 At position ⑥ in the middle, the flow equalization component is a flow equalization net 6 with holes evenly distributed on its surface.
[0035] Specifically, adjacent arc-shaped guide vanes 3 and adjacent zigzag guide vanes 5 are evenly spaced. Each arc-shaped guide vane 3 and zigzag guide vane 5 is bent or folded towards the center of the arc or the inner angle of the bend at each curve. The radius of the arc of the arc-shaped guide vane 3 and the bending angle of the zigzag guide vane 5 are the same as the radius of the arc or the bending angle at the curve. There are 2 to 3 arc-shaped guide vanes 3 at each curve, and 4 to 8 zigzag guide vanes 5 at each curve. Each zigzag guide vane 5 is composed of two flat plates connected together, and the included angle between the two flat plates is an obtuse angle.
[0036] In this embodiment, the inlet of the original flue 2 is connected to two sets of induced draft fan outlet bends. Two symmetrical arc-shaped guide plates are arranged in the two sets of induced draft fan outlet bends, and a straight guide plate 7 is arranged on the symmetrical line of the four arc-shaped guide plates.
[0037] In this embodiment, the flow equalization net 6 is made of multiple horizontal rectangular steel pipes and vertical rectangular steel pipes welded together perpendicularly. The flow equalization net is arranged perpendicular to the flue gas flow direction in the clean flue. Each end of the flow equalization net 6 is welded to the interior of the clean flue 4 or detachably connected by bolts.
[0038] This embodiment designs a desulfurization absorption tower for a 660MW thermal power unit. First, flow field simulation tests are conducted under 300MW and 600MW operating conditions. Based on the test results, the angle dimensions of the guide vanes and the dimensions of the flow equalization components are designed. The specific steps for setting them are as follows:
[0039] Step 1: Install the guide vane inside the original flue 2
[0040] At the bend of the induced draft fan outlet ( Figure 1 , 2 At position ①: Two arc-shaped guide vanes 3 are installed at the bends of the outlets of the two induced draft fans. The inner arc-shaped guide vane 3 has dimensions of 4241 (arc length, 90° angle) × 5000 (width) × 6 (thickness) (unit: mm), and weighs 998.76 kg / piece; the outer arc-shaped guide vane 3 has dimensions of 7068 (arc length, 90° angle) × 5000 × 6, and weighs 1664.51 kg / piece. This design of guide vanes with different sizes on the inner and outer sides guides the flue gas at the outlet of the induced draft fans to turn smoothly, reducing airflow impact and turbulence generation.
[0041] Exhaust fan outlet flue junction ( Figure 1 , 2 At position ② in the middle: Four (arc-shaped + straight) guide vanes are symmetrically installed at the confluence of the flue gas outlets of the two induced draft fans. The dimensions of the guide vane on the outer side of the bend are (arc 3927 (arc length, angle 90°) + straight 2003) × 6000 × 6, with a mass of 1675.82 kg / vane; the dimensions of the guide vane on the inner side of the bend are (arc 6283 (arc length, angle 90°) + straight 2003) × 6000 × 6, with a mass of 2341.62 kg / vane. These guide vanes work together to ensure uniform mixing of the flue gas at the confluence, avoiding airflow turbulence and uneven velocity.
[0042] At the bend before the inlet of desulfurization tower 1 ( Figure 1 , 2 At position ③ in the middle: Three arc-shaped guide vanes are installed at the bend before the inlet of desulfurization tower 1. The innermost arc-shaped guide vane 3 has dimensions of 3998 arcs (arc length, angle 90°) × 10000 × 6 and a mass of 1883.06 kg / vane; the middle guide vane has dimensions of 5340 arcs (arc length, angle 90°) × 10000 × 6 and a mass of 2515.14 kg / vane; the outermost arc-shaped guide vane 3 has dimensions of 7854 arcs (arc length, angle 90°) × 10000 × 6 and a mass of 3699.23 kg / vane. These guide vanes further adjust the flow direction and velocity distribution of the flue gas, making the flue gas entering the desulfurization tower more uniform and improving the efficiency of the desulfurization reaction.
[0043] Step 2: Setting up the flow guiding and equalization structure inside the clean flue duct 3
[0044] Desulfurization tower 1 outlet bend guide plate: at the first bend at the desulfurization tower outlet ( Figure 1 , 2Two zigzag guide vanes 5 are added at position ④ in the middle. The dimensions of the first group (bottom layer) of guide vanes are rectangular 500×8300×6 + trapezoidal 8300 / 8092×1200×6 (unit: mm, same below), and the weight is 658.70 kg / group; the dimensions of the second group of guide vanes are rectangular 700×8300×6 + trapezoidal 8300 / 8057×1400×6, and the weight is 812.94 kg / group (the number of newly added guide vanes can be adjusted according to the actual situation). At the second bend at the outlet of desulfurization tower 1 ( Figure 1 , 2 Four zigzag-shaped deflectors are installed at position ⑤ in the middle. The first group of deflectors (top layer) has dimensions of 800×5880×6 (rectangular) + 6026 / 5880×900×6 (trapezoidal) and weighs 473.91 kg / group. The second group of deflectors has dimensions of 1100×5880×6 (rectangular) + 6020 / 5880×900×6 (trapezoidal) and weighs 556.86 kg / group. The third group of deflectors has dimensions of 1200×5880×6 (rectangular) + 6025 / 5880×900×6 (trapezoidal) and weighs 584.66 kg / group. The fourth group of deflectors (bottom layer) has dimensions of 1300×5880×6 (rectangular) + 6035 / 5880×900×6 (trapezoidal) and weighs 612.57 kg / group. These baffles gradually guide and rectify the flue gas at the outlet of the desulfurization tower, enabling it to maintain a stable flow state at bends.
[0045] Flow equalization network 6: after the second bend at the desulfurization tower outlet and before the clean flue gas measuring point ( Figure 1 , 2 At position ⑥ in the middle, a layer of rectangular tube flow equalization assembly is installed, consisting of 16 vertical rectangular steel tubes, each measuring 80×40×3 cm and weighing 61.54 kg / tube; and 30 horizontal rectangular steel tubes, each measuring 50×50×3 cm and weighing 27.69 kg / tube. The rectangular tube flow equalization device utilizes its special structure to further evenly distribute the flue gas after it has been rectified by the guide plate, further eliminating differences in flue gas velocity and concentration, and ensuring a uniform distribution of flue gas within the clean flue.
[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A device for uniformly distributing flue gas in the original clean flue gas duct of a desulfurization tower, characterized in that, include: The first flow guiding component is installed in the original flue at the front end of the desulfurization tower. The first flow guiding component includes multiple arc-shaped flow guiding plates arranged at the outlet bend of the induced draft fan, the inlet bend of the original flue, and the outlet bend of the original flue. The second flow guiding component and the flow equalization component are installed in the clean flue gas duct at the rear end of the desulfurization tower. The second flow guiding component includes multiple zigzag flow guiding plates arranged at the first bend near the outlet of the desulfurization tower and multiple zigzag flow guiding plates at the second bend. The flow equalization component is arranged on the rear side of the second bend near the outlet of the desulfurization tower and in front of the clean flue gas measuring point. The flow equalization component is a flow equalization net with holes evenly distributed on its surface.
2. The flue gas uniform distribution device for the original clean flue gas duct of the desulfurization tower according to claim 1, characterized in that, The inlet of the original flue is connected to two sets of induced draft fan outlet bends. Two symmetrical arc-shaped guide plates are arranged in the two sets of induced draft fan outlet bends, and a straight guide plate is arranged on the symmetrical line of the four arc-shaped guide plates.
3. The flue gas uniform distribution device for the original clean flue gas duct of the desulfurization tower according to claim 1, characterized in that, The adjacent arc-shaped guide vanes and adjacent zigzag guide vanes are arranged at uniform intervals.
4. The flue gas uniform distribution device for the original clean flue gas duct of the desulfurization tower according to claim 3, characterized in that, Each of the arc-shaped guide vanes and the zigzag-shaped guide vanes is bent or folded toward the center of the arc or one side of the inner angle of the bend at the bend.
5. The flue gas uniform distribution device for the original clean flue gas duct of the desulfurization tower according to claim 4, characterized in that, The radius of the arc of the arc-shaped guide vane and the bending angle of the zigzag guide vane are the same as the radius of the arc or the bending angle at the bend.
6. The flue gas uniform distribution device for the original clean flue gas duct of the desulfurization tower according to claim 1, characterized in that, The number of arc-shaped guide vanes at each bend is 2 to 3.
7. The flue gas uniform distribution device for the original clean flue gas duct of the desulfurization tower according to claim 1, characterized in that, The number of the zigzag guide vanes at each bend is 4 to 8. Each zigzag guide vane is composed of two flat plates connected together, and the included angle between the two flat plates is an obtuse angle.
8. The flue gas uniform distribution device for the original clean flue gas duct of the desulfurization tower according to claim 1, characterized in that, The flow equalization network is formed by welding multiple horizontal rectangular steel pipes and vertical rectangular steel pipes perpendicularly together.
9. The flue gas uniform distribution device for the original clean flue gas duct of the desulfurization tower according to claim 8, characterized in that, The flow equalization net is arranged perpendicular to the direction of flue gas flow in the clean flue.
10. The flue gas uniform distribution device for the original clean flue gas duct of the desulfurization tower according to claim 8, characterized in that, Each end of the flow equalization net is welded to the interior of the clean flue or detachably connected by bolts.