Boiler flue gas discharge duct structure

Abstract

The utility model is suitable for the technical field of the discharging pipe of the fluidized bed furnace, provides a kind of fluidized bed furnace flue gas discharging pipe structure, including: diffusion pipe, collection subassembly, arc communication pipe, receiving subassembly and filter component etc..Utilize the flue gas flow impact force, make the net disc in filter component and the guide inclined plate in receiving subassembly produce sustained vibration.Vibration can effectively prevent particulate matter to adhere and accumulate on net disc and inclined plate, solve the problem that the filtering device in traditional pipeline is easy to be blocked, ensure that the flue gas passage is long-term unobstructed, reduce maintenance frequency.Set up special collection subassembly, including outer frame and the collection box that can be pulled out, the impurities filtered and vibrated finally fall into collection box along guide inclined plate, realize the centralized collection and storage to filter impurities, it is convenient to clean regularly, improve the air quality of work area, so that unburnt particle can be collected and rekindle, improve fuel utilization rate, also reduce the difficulty and intensity of manual cleaning.

Description

Technical Field

[0001] This utility model belongs to the technical field of fluidized bed furnace exhaust pipe, and in particular relates to a structure for a fluidized bed furnace flue gas exhaust pipe. Background Technology

[0002] Fluidized bed furnaces, as highly efficient thermal equipment, are widely used in acid production plants for roasting pyrite and zinc concentrate. Their working principle utilizes fluidization technology to cause fuel to burn in a boiling state within the furnace, thereby improving combustion efficiency. However, during operation, especially during emergency system shutdowns or fluctuations in operating conditions, fluidized bed furnaces generate large amounts of high-temperature flue gas. This flue gas contains high concentrations of SO2, particulate matter, unburned carbon particles, and heavy metal pollutants. Improper handling can lead to severe environmental pollution and equipment damage.

[0003] Currently, fluidized bed furnaces typically have separate venting pipes (for emptying the flue gas inside the furnace during emergency system shutdown) and emergency explosion relief pipes (for handling situations where there is a sudden surge in flue gas). These two systems need to be staggered on the furnace outlet side and each requires its own support structure, resulting in complex piping layout, large space occupation, and high manufacturing costs.

[0004] More importantly, existing venting systems lack efficient filtration mechanisms. During emergency venting, large amounts of untreated flue gas (containing dust, oil, etc.) directly enter the atmosphere or subsequent desulfurization systems, causing pollution and potentially damaging desulfurization equipment. Flue gas generated by fluidized bed combustion carries a large amount of fly ash (especially fine particulate fuel), which easily accumulates on the inner wall of the flue gas outlet, reducing pipe diameter and decreasing exhaust efficiency. Existing technologies rely heavily on manual, periodic cleaning, which is not only labor-intensive and dangerous but also prone to secondary pollution. Furthermore, unburned carbon particles in the fly ash, if directly emitted, lead to energy waste and excessive pollutant levels.

[0005] In view of this, the present invention proposes a flue gas emission pipe structure for a fluidized bed furnace. Utility Model Content

[0006] This utility model provides a flue gas emission pipe structure for a fluidized bed furnace, aiming to solve the problems of redundant design, lack of filtration, and easy blockage and maintenance of conventional venting pipes and emergency explosion relief pipes.

[0007] This utility model is implemented as follows: a flue gas emission pipe structure for a fluidized bed furnace, comprising: Furnace body; A flue gas outlet chamber located on one side of the furnace body; A vent pipe is fixedly connected to the flue gas outlet chamber; A counterweight valve is installed at the top outlet of the vent pipe; An explosion relief pipe is fixedly connected to the furnace body located on one side of the flue gas outlet chamber, and the explosion relief pipe is fixedly connected to the vent pipe; An arc-shaped connecting pipe fixedly connected to the outer wall of the vent pipe; The filter assembly installed inside the vent pipe is used to filter the flue gas that flows through the explosion relief pipe and the vent pipe into the arc-shaped connecting pipe and is discharged. The receiving component, located inside the vent pipe, is used to guide and discharge the impurities filtered by the filter component. The collection assembly located outside the vent pipe is used to collect impurities that are guided and discharged by the receiving assembly.

[0008] Preferably, the collection assembly includes an outer frame fixed to the outer wall of the venting pipe, a pull-out groove is provided through the outer wall of the outer frame, a collection box is slidably fitted inside the pull-out groove, and a handle is fixed to the outer wall of the collection box.

[0009] Preferably, a discharge slot that communicates with the interior of the outer frame is provided through the outer wall of the vent pipe located inside the outer frame.

[0010] Preferably, the outer wall of the venting pipe is provided with a first through hole and a second through hole, and the two ends of the arc-shaped connecting pipe are respectively sleeved inside the first through hole and the second through hole.

[0011] Preferably, the receiving component includes a guide ramp that penetrates the inside of the unloading trough and extends into the interior of the outer frame, the guide ramp being inclined.

[0012] Preferably, a slider is fixed to the upper outer wall of the guide inclined plate, and a transmission cavity is opened inside the venting pipe located between the first through hole and the second through hole. A fixed rod is fixed to the inner side of the transmission cavity, and the fixed rod slides through the inner side of the slider. A support spring is sleeved on the outer side of the fixed rod, and the two ends of the support spring are respectively connected to the transmission cavity and the top of the slider.

[0013] Preferably, the filter assembly includes a mesh disk disposed inside the vent pipe, and a plurality of limiters are distributed in a ring array around the outer periphery of the mesh disk.

[0014] Preferably, the limiter includes two fixing blocks respectively disposed above and below the mesh disk, and a vertical rod passing through the inside of the mesh disk is fixed between the two fixing blocks, and a return spring is sleeved on the outside of the vertical rod.

[0015] Compared with related technologies, the flue gas emission pipe structure of the fluidized bed furnace provided by this utility model has the following beneficial effects: 1. Pipeline integration and structural simplification: The emergency venting pipe and the conventional venting pipe are combined and connected, and share a set of pipe support structure. The flue gas convergence is achieved through the arc-shaped connecting pipe. This design significantly reduces the number of pipes on site and avoids the need to set up a separate support structure for the venting pipe, thereby reducing the material and manufacturing costs of the equipment. At the same time, it simplifies the installation process and reduces the workload on site. 2. High-efficiency filtration and compliant emissions: A filter assembly is installed inside the vent pipe. This assembly mainly includes a vibrating mesh disc to intercept particulate matter in the flue gas. It can effectively filter suspended solids, particulate matter, and unburned dust mixed in the flue gas, preventing these impurities from being directly emitted with the flue gas. This helps to meet environmental emission standards and reduces the adverse impact on the subsequent flue gas desulfurization system. 3. Automatic Dust Removal, Anti-clogging, and Impurity Collection: Utilizing the impact force of flue gas flow, the filter disc in the filter assembly and the guide ramp in the receiving assembly continuously vibrate. This vibration effectively prevents particulate matter from adhering and accumulating on the filter disc and ramp, solving the problem of easy clogging in traditional duct filter devices, ensuring long-term unobstructed flue gas passage, and reducing maintenance frequency. A dedicated collection assembly, including an outer frame and a pull-out collection box, allows filtered and vibrated impurities to fall into the collection box along the guide ramp, achieving centralized collection and storage of filtered impurities. This facilitates regular cleaning, improves air quality in the working area, reduces secondary pollution to the environment, allows unburned particles to be collected and reburned, improving fuel utilization, and also reduces the difficulty and intensity of manual cleaning. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the planar structure of the present invention; Figure 2 This is a schematic diagram of the structure of the collection component of this utility model; Figure 3 This is a partial cross-sectional view of the outer frame of this utility model; Figure 4 This is a schematic diagram of the internal structure of the vent pipe of this utility model; Figure 5 for Figure 4 Enlarged structural diagram at point A in the middle; Figure 6 for Figure 4 Enlarged structural diagram at point B.

[0017] In the diagram: 1. Furnace body; 2. Flue gas outlet chamber; 3. Explosion relief pipe; 4. Collection assembly; 401. Outer frame; 402. Pull-out groove; 403. Collection box; 404. Handle; 5. Venting pipe; 501. Unloading trough; 502. First through hole; 503. Second through hole; 6. Counterweight valve; 7. Arc-shaped connecting pipe; 8. Receiving assembly; 801. Guide inclined plate; 802. Slider; 803. Support spring; 804. Fixing rod; 805. Transmission chamber; 9. Filter assembly; 901. Mesh tray; 902. Return spring; 903. Vertical rod; 904. Fixing block. Detailed Implementation

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0019] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. Example 1

[0020] A preferred embodiment of the flue gas emission pipe structure for a fluidized bed boiler provided by this utility model is, for example... Figures 1 to 6 The diagram shows a flue gas emission pipe structure for a fluidized bed furnace, comprising: a furnace body 1; a flue gas outlet chamber 2 disposed on one side of the furnace body 1; a vent pipe 5 fixedly connected to the flue gas outlet chamber 2; a counterweight valve 6 disposed at the top outlet of the vent pipe 5; a venting pipe 3 fixedly connected to the furnace body 1 located on one side of the flue gas outlet chamber 2, and the venting pipe 3 and the vent pipe 5 are fixedly connected; an arc-shaped connecting pipe 7 fixedly connected to the outer wall of the vent pipe 5; a filter assembly 9 disposed inside the vent pipe 5 for filtering the flue gas that flows through the venting pipe 3 and the vent pipe 5 into the arc-shaped connecting pipe 7 and is discharged; a receiving assembly 8 disposed inside the vent pipe 5 for guiding and discharging impurities filtered by the filter assembly 9; and a collection assembly 4 disposed outside the vent pipe 5 for collecting the impurities guided and discharged by the receiving assembly 8.

[0021] In this embodiment, when the system experiences a sudden problem and shuts down, or when the flue gas generated by combustion inside the furnace body 1 is excessively abundant, causing excessive flue gas pressure, the flue gas inside the furnace body 1 is vented through the explosion relief pipe 3 and the vent pipe 5. The high-pressure flue gas discharged from inside the furnace body 1 flows into the explosion relief pipe 3 and the vent pipe 5. Under the obstruction of the receiving component 8, the flue gas flows into the arc-shaped connecting pipe 7 and then flows back into the vent pipe 5 for discharge.

[0022] In this embodiment, suspended solids, particulate matter, and unburned dust in the flue gas discharged through the vent pipe 5 are filtered and blocked by the filter assembly 9 to prevent them from being discharged to the outside with the flue gas, causing non-compliance with emission standards or adversely affecting the desulfurization work of the subsequent flue gas desulfurization system. The suspended solids, particulate matter, and unburned dust filtered by the filter assembly 9 fall onto the receiving assembly 8 and are guided by the receiving assembly 8 to the collection assembly 4 for collection. Example 2

[0023] Based on Example 1, a preferred embodiment of the fluidized bed furnace flue gas emission pipe structure provided by this utility model is as follows: Figures 1 to 6 As shown: The collecting component 4 includes an outer frame 401 fixed to the outer wall of the venting pipe 5. A pull-out groove 402 is provided through the outer wall of the outer frame 401. A collecting box 403 is slidably fitted inside the pull-out groove 402. A handle 404 is fixed to the outer wall of the collecting box 403. A discharge slot 501, communicating with the interior of the outer frame 401, is provided through the outer wall of the venting pipe 5 located inside the outer frame 401. A first through hole 502 and a second through hole 503 are provided through the outer wall of the venting pipe 5. The two ends of the arc-shaped connecting pipe 7 are respectively fitted inside the first through hole 502 and the second through hole 503.

[0024] The receiving component 8 includes a guide ramp 801 that penetrates the inside of the unloading chute 501 and extends into the interior of the outer frame 401. The guide ramp 801 is inclined. A slider 802 is fixedly connected to the upper outer wall of the guide ramp 801. A transmission cavity 805 is provided inside the vent pipe 5 located between the first through hole 502 and the second through hole 503. A fixing rod 804 is fixedly connected to the inside of the transmission cavity 805. The fixing rod 804 slides through the inside of the slider 802. A support spring 803 is sleeved on the outside of the fixing rod 804. The two ends of the support spring 803 are respectively connected to the transmission cavity 805 and the top of the slider 802.

[0025] The filter assembly 9 includes a mesh tray 901 disposed inside the vent pipe 5, and a number of limiters are arranged in a ring array around the outer periphery of the mesh tray 901. Each limiter includes two fixing blocks 904 respectively disposed above and below the mesh tray 901, and a vertical rod 903 that penetrates the interior of the mesh tray 901 is fixed between the two fixing blocks 904. A return spring 902 is sleeved on the outside of the vertical rod 903.

[0026] In this embodiment, during operation, in the event of a sudden system malfunction and emergency shutdown, or when an excessive amount of flue gas generated inside the furnace 1 causes excessive flue gas pressure, the flue gas inside the furnace 1 is vented through the explosion relief pipe 3 and the vent pipe 5. The high-pressure flue gas discharged from inside the furnace 1 flows into the explosion relief pipe 3 and the vent pipe 5. After being blocked by the guide plate 801, the flue gas flows through the explosion relief pipe 3 and the vent pipe 5 and then into the arc-shaped connecting pipe 7, and is then transported again through the arc-shaped connecting pipe 7 to the vent pipe 5 for discharge.

[0027] In this embodiment, suspended matter, particulate matter, and unburned dust mixed in the flue gas flowing inside the arc-shaped connecting pipe 7 are filtered and blocked by the filter component 9 to prevent them from being discharged to the outside with the flue gas, causing non-compliance with emission standards or adversely affecting the desulfurization work of the subsequent flue gas desulfurization system.

[0028] In this embodiment, during the emission of flue gas through the vent pipe 3 and the collection assembly 4, the flue gas and impurities mixed in it impact the guide ramp 801 and the mesh tray 901. This causes the mesh tray 901 to vibrate reciprocally outside the upright 903 under the action of the return spring 902, and causes the guide ramp 801 to vibrate inside the vent pipe 5 under the action of the slider 802, the fixed rod 804, and the support spring 803. It should be noted that the lower side of the guide ramp 801 can be movably connected to the bottom of the discharge chute 501 or connected to the bottom of the discharge chute 501 via a spring. When the flue gas pressure decreases, suspended solids, particulate matter, and unburned dust fall under the influence of gravity.

[0029] In this embodiment, the vibrating mesh disk 901 can effectively prevent impurities such as suspended matter, particulate matter and unburned dust from adhering to the outer wall of the mesh disk 901 and causing blockage. The vibrating guide plate 801 can shake and discharge some of the impurities that fall on the outer wall of the guide plate 801 during the flue gas emission process, so that they are collected in the collection box 403 on the collection component 4 for collection and storage.

[0030] It is worth noting that the circuits, electronic components, and modules involved in this utility model are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this utility model does not involve any improvement to the software and methods.

[0031] It should be understood that the disclosed apparatus can be implemented in other ways, as illustrated in the several embodiments provided in this application. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of the units described above is only a logical functional division of the flue gas emission pipe structure of a fluidized bed boiler. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or communication connections shown or discussed may be through some interfaces; the indirect coupling or communication connections between devices or units may be telecommunications or other forms.

[0032] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Although this utility model has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of this utility model according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of this utility model. These technical solutions are also within the scope of protection of this utility model.

Claims

1. A flue gas exhaust pipe structure for a fluidized bed boiler, characterized in that, include: Furnace body (1); The flue gas outlet chamber (2) is located on one side of the furnace body (1); A vent pipe (5) is fixedly connected to the flue gas outlet chamber (2); A counterweight valve (6) is installed at the top outlet of the vent pipe (5); An explosion relief pipe (3) is fixedly connected to the furnace body (1) located on one side of the flue gas outlet chamber (2), and the explosion relief pipe (3) is fixedly connected to the vent pipe (5); An arc-shaped connecting pipe (7) is fixedly connected to the outer wall of the vent pipe (5); The filter assembly (9) installed inside the vent pipe (5) is used to filter the flue gas that flows through the explosion relief pipe (3) and the vent pipe (5) into the inner side of the arc-shaped connecting pipe (7) and is discharged. The receiving component (8) located inside the vent pipe (5) is used to guide and discharge the impurities filtered by the filter component (9). The collection assembly (4) located outside the vent pipe (5) is used to collect impurities that are guided and discharged by the receiving assembly (8).

2. The flue gas emission pipe structure for a fluidized bed boiler as described in claim 1, characterized in that, The collection component (4) includes an outer frame (401) fixed to the outer wall of the venting pipe (5), a pull-out groove (402) is provided through the outer wall of the outer frame (401), a collection box (403) is slidably sleeved inside the pull-out groove (402), and a handle (404) is fixed to the outer wall of the collection box (403).

3. The flue gas emission pipe structure for a fluidized bed boiler as described in claim 2, characterized in that, The outer wall of the vent pipe (5) located inside the outer frame (401) is provided with a discharge slot (501) that communicates with the inside of the outer frame (401).

4. The flue gas emission pipe structure for a fluidized bed boiler as described in claim 3, characterized in that, The outer wall of the venting pipe (5) is provided with a first through hole (502) and a second through hole (503), and the two ends of the arc-shaped connecting pipe (7) are respectively sleeved inside the first through hole (502) and the second through hole (503).

5. The flue gas emission pipe structure for a fluidized bed boiler as described in claim 4, characterized in that, The receiving component (8) includes a guide ramp (801) that penetrates the inside of the unloading chute (501) and extends into the inside of the outer frame (401), the guide ramp (801) being inclined.

6. The flue gas emission pipe structure for a fluidized bed boiler as described in claim 5, characterized in that, A slider (802) is fixedly connected to the upper outer wall of the guide plate (801). A transmission cavity (805) is provided inside the vent pipe (5) located between the first through hole (502) and the second through hole (503). A fixing rod (804) is fixedly connected to the inner side of the transmission cavity (805). The fixing rod (804) slides through the inner side of the slider (802). A support spring (803) is sleeved on the outer side of the fixing rod (804). The two ends of the support spring (803) are respectively connected to the top of the transmission cavity (805) and the top of the slider (802).

7. The flue gas emission pipe structure for a fluidized bed boiler as described in claim 6, characterized in that, The filter assembly (9) includes a mesh disk (901) disposed inside the vent pipe (5), and a number of limiters are distributed in a ring array on the outer periphery of the mesh disk (901).

8. The flue gas emission pipe structure for a fluidized bed boiler as described in claim 7, characterized in that, The limiter includes two fixing blocks (904) respectively disposed above and below the mesh disk (901), and a vertical rod (903) that penetrates the inside of the mesh disk (901) is fixed between the two fixing blocks (904). A return spring (902) is sleeved on the outside of the vertical rod (903).

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