Boiler tail flue dust deposition prevention flow field turbulent flow device and boiler
By setting up a material level and flue gas flow rate measurement device in the boiler tail flue, adjusting the position of the flow blocking plate, and combining the flow balancing plate to improve flow uniformity, the problem of ash accumulation in the flue is solved, reducing maintenance costs and wear, and improving flue gas Flow rate and dust carrying capacity.
Patent Information
- Application Number
- CN202323405474.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-13
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2033-12-13
AI Technical Summary
In the prior art, the flue at the tail of the boiler is severely ash, resulting in uneven flue gas flow rate, which increases the wear of the flue wall and inner support members, increases the maintenance workload, and poses a risk of incomplete cleaning.
A flow field spoiler device for preventing ash accumulation at the tail flue of the boiler is designed, including a material level measuring device and a flue gas flow rate measuring device in the horizontal and vertical sections, adjusting the position of the flow blocking plate through the lifting structure and adjusting the smoke. The air flow rate is combined with the flow equilibrium to improve flow uniformity and increase the flue gas flow rate to improve the ash accumulation condition.
It effectively reduces ash accumulation in the flue at the tail of the boiler, reduces maintenance costs, increases flue gas flow rate, enhances dust carrying capacity, and simplifies on-site renovation work.
Smart Images
Figure CN222335409U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of coal or biomass burning boilers, in particular to a flow field disturbance device for preventing dust accumulation in a tail flue of a boiler, and a boiler. Background Art
[0002] The flue is the channel for flue gas to flow. The flue gas from power plant boilers or industrial furnaces that burn coal or biomass contains a lot of dust. After long-term use, there is often a lot of ash accumulation in the horizontal section or the lower part of the vertical climbing section of the flue at the tail of the boiler. Fly ash accumulates in the flue body, which not only increases the flue load, but also reduces the flow area of the flue gas, increases the flue gas velocity, greatly aggravates the wear of the flue wall and internal support rods, and increases a lot of additional maintenance work. In severe cases, it may even cause the flue to collapse due to ash accumulation.
[0003] At present, the commonly used flue ash treatment method is usually to set up an ash discharge port at the tail flue of the boiler, and the staff regularly discharges ash manually through the ash discharge port. However, the manual ash removal effect is very poor, and there are areas that are not thoroughly cleaned. Before each boiler maintenance, a large amount of manpower and material resources must be invested in horizontal flue ash cleaning, which is risky, takes a long time to clean, and the boiler's induced draft fan and induced draft fan are turned on for a longer time, which increases power consumption.
[0004] According to DL / T 5121-2000 "Technical Specifications for Design of Smoke, Air and Pulverized Coal Pipes in Thermal Power Plants", the recommended design velocity of the flue leading to the chimney after the air preheater is 10-15m / s. When designing, the ash accumulation in the flue before the dust collector is calculated based on the remaining cross-section at a velocity of 8m / s. In actual situations, due to the uneven velocity distribution in the flue, there are local low flue gas velocity, and the location with low velocity is generally the area with serious ash accumulation. Utility Model Content
[0005] Therefore, the technical problem to be solved by the utility model is to overcome the serious dust accumulation problem in the prior art, thereby providing a flow field spoiler device for preventing dust accumulation in the tail flue of a boiler and a boiler.
[0006] In order to solve the above technical problems, the utility model provides a flow field spoiler device for preventing dust accumulation in a boiler tail flue, comprising: a boiler tail flue, the boiler tail flue comprising a horizontal section, a vertical section, and a corner section, a material level measuring device is provided on the horizontal section, and a flue gas flow rate measuring device is provided on the vertical section; a flow equalizing plate, arranged at the corner section of the boiler tail flue; a baffle, arranged on the horizontal section and located between the material level measuring device and the flow equalizing plate; a lifting structure, arranged on the outside of the horizontal section, and the lifting structure is connected to the baffle, and the lifting structure is used to drive the baffle to perform lifting movement relative to the boiler tail flue.
[0007] Furthermore, the cross section of the baffle is 50% to 70% of the cross section of the boiler tail flue.
[0008] Furthermore, the flow equalizing plates have at least two rows, which are arranged at intervals in the corner section.
[0009] Furthermore, each row of the flow equalizing plates has multiple groups, and the multiple groups of the flow equalizing plates are arranged along the radial direction of the boiler tail flue.
[0010] Furthermore, each row of the flow equalizing plates has 3 to 6 groups.
[0011] Furthermore, the cross section of the current equalizing plate is arc-shaped.
[0012] Furthermore, the cross section of the flow equalizing plate is in a broken line shape.
[0013] Furthermore, it also includes a control device, which is connected to the material level measuring device, the flue gas flow rate measuring device, and the lifting structure.
[0014] Furthermore, the lifting structure is a chain lifting mechanism.
[0015] The utility model also provides a boiler, comprising the flow field spoiler device for preventing dust accumulation in the tail flue of the boiler.
[0016] The technical solution of this utility model has the following advantages:
[0017] 1. The utility model provides a flow field spoiler device for preventing dust accumulation in a boiler tail flue, comprising: a boiler tail flue, the boiler tail flue comprising a horizontal section, a vertical section, and a corner section, a material level measuring device is provided on the horizontal section, and a flue gas flow rate measuring device is provided on the vertical section; a flow equalizing plate, provided at the corner section of the boiler tail flue; a baffle, provided on the horizontal section, and located between the material level measuring device and the flow equalizing plate; a lifting structure, provided on the outside of the horizontal section, and the lifting structure is connected to the baffle, and the lifting structure is used to drive the baffle to perform lifting movement relative to the boiler tail flue.
[0018] By setting a material level measuring device in the horizontal section of the boiler tail flue, that is, setting a material level measuring device at the inlet of the boiler tail flue, and setting a flue gas flow rate measuring device in the vertical section, that is, setting a flue gas flow rate measuring device at the outlet of the boiler tail flue, the test results of the material level measuring device and the flue gas flow rate measuring device can be used to determine the lifting height of the baffle plate. The lifting and lowering of the baffle plate is driven by the lifting structure, thereby adjusting the flow rate of the flue gas in the boiler tail flue, reducing the effective flow cross-section of the boiler tail flue, increasing the flow rate at the bottom of the boiler tail flue, and enhancing the dust carrying capacity of the bottom boiler tail flue. In the default state, the baffle area in the boiler tail flue is zero. At the same time, the flow equalizer can greatly improve the uniformity of the flue gas flow at the turning section.
[0019] The flow field spoiler device for preventing ash accumulation in the boiler's rear flue increases the flue gas flow velocity in the local area of the boiler's rear flue by arranging flow equalizers and baffles, and utilizes the self-purge ability of the flue gas to improve the ash accumulation condition inside the boiler's rear flue. Compared with other technologies, the spoiler device requires less on-site modification work and can significantly reduce maintenance costs.
[0020] 2. The utility model provides a flow field spoiler device for preventing dust accumulation in the boiler tail flue, wherein the cross section of the baffle is 50% to 70% of the cross section of the boiler tail flue. By adjusting the baffle, the effective cross section of the boiler tail flue is reduced, the flow velocity at the bottom of the boiler tail flue is increased, and the dust carrying capacity of the bottom boiler tail flue is enhanced.
[0021] The utility model summary is provided to introduce a selection of concepts in a simplified form, which will be further described in the following detailed description. The utility model summary is not intended to identify key features or essential features of the present disclosure, nor is it intended to limit the scope of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0023] Figure 1 A schematic diagram of the structure of a flow field spoiler device for preventing dust accumulation in a boiler tail flue provided by the utility model;
[0024] Figure 2 A cross-sectional view of a baffle plate of a flow field spoiler device for preventing dust accumulation in a boiler tail flue provided by the utility model.
[0025] Description of reference numerals:
[0026] 1. Boiler tail flue; 2. Horizontal section; 3. Vertical section; 4. Corner section; 5. Flow equalizing plate; 6. Baffle plate; 7. Lifting structure; 8. Control device. DETAILED DESCRIPTION
[0027] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present disclosure. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.
[0028] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.
[0029] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.
[0030] In the present disclosure, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is lower in level than the second feature.
[0031] The disclosure below provides many different embodiments or examples to realize different structures of the present disclosure. In order to simplify the disclosure of the present disclosure, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present disclosure. In addition, the present disclosure can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present disclosure provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.
[0032] The preferred embodiments of the present disclosure are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present disclosure, and are not used to limit the present disclosure.
[0033] See also Figure 1 to Figure 2 As shown, the utility model provides a flow field spoiler device for preventing dust accumulation in a boiler tail flue, comprising: a boiler tail flue 1, wherein the boiler tail flue 1 comprises a horizontal section 2, a vertical section 3, and a corner section 4, wherein a material level measuring device is provided on the horizontal section 2, and a flue gas flow rate measuring device is provided on the vertical section 3; a flow equalizing plate 5, which is arranged at the corner section 4 of the boiler tail flue 1; a baffle 6, which is arranged on the horizontal section 2 and is located between the material level measuring device and the flow equalizing plate 5; a lifting structure 7, which is arranged on the outside of the horizontal section 2, and the lifting structure 7 is connected to the baffle 6, and the lifting structure 7 is used to drive the baffle 6 to perform lifting movement relative to the boiler tail flue 1.
[0034] By setting a material level measuring device in the horizontal section 2 of the boiler tail flue 1, that is, setting a material level measuring device at the inlet of the boiler tail flue 1, and setting a flue gas flow rate measuring device in the vertical section 3, that is, setting a flue gas flow rate measuring device at the outlet of the boiler tail flue 1, the lifting height of the baffle 6 can be determined by using the test results of the material level measuring device and the flue gas flow rate measuring device. The lifting and lowering of the baffle 6 is driven by the lifting structure 7, thereby adjusting the flow rate of the flue gas in the boiler tail flue 1, reducing the effective flow cross-section of the boiler tail flue 1, increasing the flow rate at the bottom of the boiler tail flue 1, and enhancing the dust carrying capacity of the bottom boiler tail flue 1. In the default state, the baffle area of the baffle 6 in the boiler tail flue 1 is zero. At the same time, the flow equalizing plate 5 can greatly improve the uniformity of the flue gas flow at the turning section.
[0035] The flow field spoiler device for preventing dust accumulation in the boiler tail flue increases the flue gas flow velocity in a local area in the boiler tail flue 1 by arranging a flow equalizing plate 5 and a baffle 6, and utilizes the self-purge ability of the flue gas to improve the dust accumulation condition inside the boiler tail flue 1. Compared with other technologies, the spoiler device requires less on-site modification work and can significantly reduce maintenance costs.
[0036] The flow of flue gas carrying fly ash is a typical dilute phase flow. Under normal working conditions, the ability of flue gas to carry fly ash depends on whether the flue gas velocity can meet the requirements. According to relevant theories, in the process of pneumatic conveying of powder, in order to prevent the powder from settling in the flue, the air flow velocity should be greater than the limit velocity. Combined with the actual calculation of coal-fired boilers, the flue gas velocity required for conveying in vertical pipes is higher than 3-4 m / s.
[0037] In some optional embodiments, the cross section of the baffle plate 6 is 50% to 70% of the cross section of the boiler tail flue 1. By adjusting the baffle plate 6, the effective flow cross section of the boiler tail flue 1 is reduced, the flow velocity at the bottom of the boiler tail flue 1 is increased, and the dust carrying capacity of the bottom boiler tail flue 1 is enhanced. At the same time, in order to ensure the stability of the flue during the lifting process, limit channels for the lifting of the baffle plate 6 can be arranged on both sides of the boiler tail.
[0038] In some optional embodiments, the flow equalizer 5 has at least two rows, which are arranged at intervals in the corner section 4. The installation position of the flow equalizer 5 can be determined according to the size of the flue, which can greatly improve the uniformity of the flue gas flow in the turning chamber.
[0039] Specifically, each row of the flow equalizing plates 5 has a plurality of groups, and the plurality of groups of the flow equalizing plates 5 are arranged along the radial direction of the boiler tail flue 1. In this embodiment, each row of the flow equalizing plates 5 has 3 to 6 groups.
[0040] In order to ensure the rigidity of the flow equalizing plates 5, in addition to the connection parts of the side walls of the boiler tail flue 1 being fully welded on both sides, each group of flow equalizing plates 5 is connected and reinforced by internal support rods.
[0041] The cross section of the current equalizing plate 5 is arc-shaped.
[0042] In order to improve the ash accumulation condition at the bottom of the flue, the cross section of the flow equalizer 5 can also be in a broken line shape in combination with the flue gas flow condition. Specifically, the cross section shape of the flow equalizer 5 can be set according to actual conditions.
[0043] In some optional embodiments, the flow field disturbance device for preventing ash accumulation in the tail flue of the boiler further includes a control device 8 , and the control device 8 is connected to the material level measuring device, the flue gas flow rate measuring device, and the lifting structure 7 .
[0044] The control device 8 is installed near the boiler tail flue 1, and determines the unit operating load according to the measurement value measured by the flue gas flow rate measuring device, and determines the ash accumulation inside the boiler tail flue 1 according to the material level measurement value measured by the material level measuring device; when the ash accumulation in the boiler tail flue 1 of the corner section 4 is large, the lifting structure 7 controls the baffle 6 downward to reduce the flow area of the boiler tail flue 1, increase the flue gas flow rate in the lower part, and use the self-purge ability of the flue gas to take away the accumulated fly ash.
[0045] The control device 8 is a PLC control device 8 arranged at a suitable position outside the boiler tail flue 1 .
[0046] The flue gas velocity measuring device is arranged in the vertical section 3, using a multi-point sampling backrest tube type measuring element, and the measured data is transmitted to the control device 8 after processing. The material level measuring device is arranged at the turning section, using a radar or ultrasonic type measuring element, and the measured data is transmitted to the control device 8 after processing.
[0047] In this embodiment, the lifting structure 7 is a chain lifting mechanism.
[0048] The utility model also provides a boiler, comprising the flow field spoiler device for preventing dust accumulation in the tail flue of the boiler.
[0049] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.
Claims
1. A flow field spoiler device for preventing dust accumulation in the tail flue of a boiler, characterized in that: include: A boiler tail flue (1), the boiler tail flue (1) comprising a horizontal section (2), a vertical section (3), and a corner section (4), the horizontal section (2) being provided with a material level measuring device, and the vertical section (3) being provided with a flue gas velocity measuring device; A flow balancing plate (5) is arranged at a corner section (4) of the boiler tail flue (1); A baffle (6) is provided on the horizontal section (2) and is located between the material level measuring device and the flow balancing plate (5); A lifting structure (7) is arranged outside the horizontal section (2), and the lifting structure (7) is connected to the baffle plate (6). The lifting structure (7) is used to drive the baffle plate (6) to perform lifting movement relative to the boiler tail flue (1).
2. The flow field spoiler device for preventing dust accumulation in the tail flue of a boiler according to claim 1, characterized in that: The cross section of the baffle plate (6) is 50% to 70% of the cross section of the boiler tail flue (1).
3. The flow field spoiler device for preventing dust accumulation in the tail flue of a boiler according to claim 2, characterized in that: The flow equalizing plates (5) have at least two rows and are arranged at intervals in the corner section (4).
4. The flow field spoiler device for preventing dust accumulation in the tail flue of a boiler according to any one of claims 1 to 3, characterized in that: Each row of the flow equalizing plates (5) has a plurality of groups, and the plurality of groups of the flow equalizing plates (5) are arranged along the radial direction of the boiler tail flue (1).
5. The flow field spoiler device for preventing dust accumulation in the tail flue of a boiler according to claim 4, characterized in that: Each row of the flow equalizing plates (5) has 3 to 6 groups.
6. The flow field spoiler device for preventing dust accumulation in the tail flue of a boiler according to claim 5, characterized in that: The cross section of the flow equalizing plate (5) is arc-shaped.
7. The flow field spoiler device for preventing dust accumulation in the tail flue of a boiler according to claim 5, characterized in that: The cross section of the flow balancing plate (5) is in the shape of a broken line.
8. The flow field spoiler device for preventing dust accumulation in the tail flue of a boiler according to claim 6, characterized in that: It also comprises a control device (8), wherein the control device (8) is connected to the material level measuring device, the flue gas flow rate measuring device, and the lifting structure (7).
9. The flow field spoiler device for preventing dust accumulation in the tail flue of a boiler according to claim 1, characterized in that: The lifting structure (7) is a chain-type lifting mechanism.
10. A boiler, characterized in that: A flow field spoiler device for preventing dust accumulation in a boiler tail flue as claimed in any one of claims 1 to 9.