Biomass circulating fluidized bed boiler hood
By setting up a mobile unit and curved groove in the hood of the biomass circulating fluidized bed boiler, the problems of hood wear and air exhaust fixation are solved, and the durability of the hood and the safety of the boiler are improved.
Patent Information
- Application Number
- CN202421673211.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-15
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-07-15
AI Technical Summary
The existing boiler hood is seriously worn and needs to be replaced frequently. The fixed air outlet size leads to a limited air exhaust volume, which affects the safety of the boiler.
A biomass circulating fluidized bed boiler air hood is designed, including an air outlet hood and a protective hood, and a mobile unit is set up to facilitate automatic adjustment of air outlet communication under high pressure, expand the exhaust passage, and use arc-shaped grooves to buffer air flow and avoid wear.
It effectively avoids wear of the hood, reduces the replacement frequency, ensures stable pressure in the boiler, and improves safety and exhaust efficiency.
Smart Images
Figure CN223137864U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of boiler air caps, in particular to a biomass circulating fluidized bed boiler air cap. Background Technique
[0002] The boiler air cap is the air distribution device of the boiler. The air cap plays a role in evenly distributing air, ensuring uniform fluidization throughout the furnace, and avoiding local coking, which plays a crucial role in the safe and economic operation of the boiler.
[0003] The characteristics of the existing boiler air caps are that the air cap apertures are small and the air distribution uniformity is good, but the wear phenomenon caused by the too small design spacing is relatively common. The characteristics of the large air caps are that the air cap apertures are large, and the turbulence intensity is large after reaching the critical fluidization. Their design spacing is large, so the wear caused by the air caps blowing against each other can be effectively avoided. However, during the use of the boiler air caps, the boiler air caps are severely worn, resulting in frequent replacement. Moreover, in the existing technology, the air outlet sizes of the boiler air caps are fixed, resulting in the air discharge volume being limited within a certain range. When the air discharge volume cannot keep up, it will cause a large boiler pressure and affect the safety of the boiler. Therefore, we propose a biomass circulating fluidized bed boiler air cap. Content of the Utility Model
[0004] Aiming at the deficiencies of the existing technology, the utility model provides a biomass circulating fluidized bed boiler air cap, which solves the problems that during the use of the boiler air cap, the boiler air cap is severely worn, resulting in frequent replacement, and in the existing technology, the air outlet size of the boiler air cap is fixed, resulting in the air discharge volume being limited within a certain range. When the air discharge volume cannot keep up, it will cause a large boiler pressure and affect the safety of the boiler.
[0005] To achieve the above purposes, the utility model is realized through the following technical solutions: A biomass circulating fluidized bed boiler air cap, including a boiler air cap, an air outlet cap is fixedly connected to the top end surface of the boiler air cap, a protective cap is sleeved on the outer peripheral wall of the air outlet cap, a plurality of upper air outlets and lower air outlets are opened on the protective cap, the opening position of the upper air outlet corresponds to the air outlet cap, the boiler air cap and the air outlet cap are communicated with the upper air outlet on the protective cap, the opening position of the lower air outlet corresponds to the boiler air cap, and the following are provided on the boiler air cap:
[0006] A moving unit, the moving unit includes a fixed seat, a connecting seat and a spring, and both ends of the spring are fixedly connected to the fixed seat and the connecting seat respectively, and the connecting seat is fixedly connected to the protective cap.
[0007] Preferably, a threaded groove is opened on the inner wall of the boiler air cap, and the boiler air cap is connected to the circulating fluidized bed boiler through the threaded groove.
[0008] Preferably, an arc-shaped groove is opened at the top of the protective cap.
[0009] Preferably, a fixing seat is arranged inside the protective cap, and the fixing seat is fixedly connected to the inner wall of the boiler air cap.
[0010] Preferably, a plurality of guiding seats are fixedly connected to the outer wall of the fixing seat.
[0011] Preferably, the guiding seat is slidably connected to the connecting seat.
[0012] Preferably, a limiting block is fixedly connected to one end of the guiding seat away from the fixing seat, and the limiting block is attached to the connecting seat.
[0013] The utility model discloses a biomass circulating fluidized bed boiler air cap, and the beneficial effects thereof are as follows:
[0014] When the air in the circulating fluidized bed boiler is discharged through the upper air outlet, when the discharged air pressure is relatively large, the large air pressure cannot be completely controlled to be discharged through the upper air outlet. At this time, the large air pressure pushes the protective cap to move. Under the movement of the protective cap, the lower air outlet on the protective cap is communicated with the air outlet cap, thereby expanding the communication between the air outlet cap and the upper air outlet and the lower air outlet, facilitating rapid air exchange, discharging waste gas and exchanging oxygen, avoiding excessive pressure in the boiler and preventing potential safety hazards. Under the action of the arc-shaped groove, the circulating air is buffered, preventing the circulating air from directly impacting the upper air outlet on the protective cap and avoiding excessive wear of the protective cap, resulting in a high replacement frequency of the protective cap. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.
[0016] Figure 1 It is a schematic structural diagram of the present utility model;
[0017] Figure 2 It is a sectional view of the present utility model;
[0018] Figure 3 It is the present utility model Figure 2 Partial enlarged view in.
[0019] In the figure: 1, boiler air cap; 2, air outlet cap; 3, fixing seat; 301, guiding seat; 302, limiting block; 4, protective cap; 401, upper air outlet; 402, lower air outlet; 5, connecting seat; 501, spring. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Apparently, the described embodiments are some, rather than all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0021] By providing an air cap for a biomass circulating fluidized bed boiler in the embodiments of the present application, the problems that during the use of the boiler air cap 1, the boiler air cap 1 is severely worn, resulting in frequent replacement, and in the prior art, the air outlet size of the boiler air cap 1 is fixed, resulting in the air discharge volume being limited within a certain range, and when the air discharge volume cannot keep up, it will cause a relatively large boiler pressure and affect the safety of the boiler are solved. When the air in the circulating fluidized bed boiler is discharged through the upper air outlet 401, when the discharged air pressure is relatively large, the air pressure is too large to completely control the discharge through the upper air outlet 401. At this time, the large air pressure pushes the protective cap 4 to move. Under the movement of the protective cap 4, the lower air outlet 402 on the protective cap 4 communicates with the air outlet cap 2, thereby expanding the communication between the air outlet cap 2, the upper air outlet 401, and the lower air outlet 402, facilitating rapid air exchange, exhaust gas discharge, and oxygen exchange, avoiding excessive pressure in the boiler and potential safety hazards. Under the action of the arc-shaped groove, the circulating air is buffered to prevent the circulating air from directly impacting the upper air outlet 401 on the protective cap 4 and avoid excessive wear of the protective cap 4, resulting in a relatively high replacement frequency of the protective cap 4.
[0022] To better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the accompanying drawings of the specification and specific embodiments.
[0023] The embodiments of the present utility model disclose an air cap for a biomass circulating fluidized bed boiler.
[0024] As shown in Figure 1 -3, it includes a boiler air cap 1. An air outlet cap 2 is fixedly connected to the top end surface of the boiler air cap 1. A protective cap 4 is sleeved on the outer peripheral wall of the air outlet cap 2. A plurality of upper air outlets 401 and lower air outlets 402 are opened on the protective cap 4. The opening position of the upper air outlet 401 corresponds to the air outlet cap 2. The boiler air cap 1 and the air outlet cap 2 communicate with the upper air outlet 401 on the protective cap 4. The opening position of the lower air outlet 402 corresponds to the boiler air cap 1. When the air in the circulating fluidized bed boiler enters the protective cap 4 through the air outlet cap 2, the air is discharged through the upper air outlet 401 on the protective cap 4 to control the exhaust gas discharge and oxygen circulation. When the discharged air pressure is relatively large, it is discharged outward through the lower air outlet 402. The following is provided on the boiler air cap 1:
[0025] The moving unit includes a fixed seat 3, a connecting seat 5 and a spring 501. The two ends of the spring 501 are respectively fixedly connected to the fixed seat 3 and the connecting seat 5. The connecting seat 5 is fixedly connected to the protective cap 4. When the air in the circulating fluidized bed boiler is discharged through the upper air outlet 401, when the discharged air pressure is relatively large, the large air pressure cannot completely control the discharge of the upper air outlet 401. At this time, the large air pressure pushes the protective cap 4 to move. Under the movement of the protective cap 4, the lower air outlet 402 on the protective cap 4 is communicated with the air outlet cap 2, so as to expand the communication between the air outlet cap 2, the upper air outlet 401 and the lower air outlet 402, facilitate rapid air exchange, discharge waste gas and exchange oxygen, and avoid the situation of excessive pressure in the boiler and potential safety hazards.
[0026] Threaded grooves are formed on the inner wall of the boiler air cap 1. The boiler air cap 1 is connected to the circulating fluidized bed boiler through the threaded grooves, and the boiler air cap 1 is screwed onto the circulating fluidized bed boiler.
[0027] An arc-shaped groove is formed at the top of the protective cap 4. Under the action of the arc-shaped groove, the circulating air is buffered to prevent the circulating air from directly impacting the upper air outlet 401 on the protective cap 4, and to avoid excessive wear of the protective cap 4, resulting in a relatively high replacement frequency of the protective cap 4.
[0028] A fixed seat 3 is arranged inside the protective cap 4, and the fixed seat 3 is fixedly connected to the inner wall of the boiler air cap 1.
[0029] A plurality of guide seats 301 are fixedly connected to the outer wall of the fixed seat 3.
[0030] The guide seat 301 is slidably connected to the connecting seat 5. Under the action of the guide seat 301, the protective cap 4 and the connecting seat 5 move stably on the boiler air cap 1. The spring 501 is sleeved on the guide seat 301. Under the action of the spring 501, the position of the protective cap 4 is limited.
[0031] A limiting block 302 is fixedly connected to one end of the guide seat 301 away from the fixed seat 3. The limiting block 302 is in contact with the connecting seat 5. When the pressure is relatively large, the protective cap 4 is pushed to drive the connecting seat 5 to slide on the guide seat 301, squeezing the spring 501, so that the lower air outlet 402 is communicated with the air outlet cap, facilitating accelerated exhaust and avoiding the situation of excessive boiler pressure;
[0032] When the pressure decreases, under the rebound of the spring 501, the protective cap 4 is pushed back to the starting position. At the same time, the connecting seat contacts the limiting seat 302. Under the action of the limiting block 302, the position of the connecting seat 5 is limited.
[0033] The above has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.
Claims
1. A biomass circulating fluidized bed boiler air cap, comprising a boiler air cap (1), characterized in that, A wind cap (2) is fixedly connected to the top end surface of the boiler wind cap (1). A protective cap (4) is sleeved on the outer peripheral wall of the wind cap (2). A plurality of upper air outlets (401) and lower air outlets (402) are formed in the protective cap (4). The opening position of the upper air outlet (401) corresponds to that of the wind cap (2). The boiler wind cap (1) and the wind cap (2) are communicated with the upper air outlet (401) on the protective cap (4). The opening position of the lower air outlet (402) corresponds to that of the boiler wind cap (1). The following is provided on the boiler wind cap (1): A moving unit, which includes a fixed seat (3), a connecting seat (5) and a spring (501). The two ends of the spring (501) are respectively fixedly connected to the fixed seat (3) and the connecting seat (5). The connecting seat (5) is fixedly connected to the protective cap (4).
2. The air cap of a biomass circulating fluidized bed boiler according to claim 1, characterized in that, Thread grooves are formed on the inner wall of the boiler wind cap (1). The boiler wind cap (1) is connected to the circulating fluidized bed boiler through the thread grooves.
3. A wind cap for a biomass circulating fluidized bed boiler according to claim 1, characterized in that An arc-shaped groove is formed at the top of the protective cap (4).
4. A wind cap for a biomass circulating fluidized bed boiler according to claim 3, characterized in that, A fixed seat (3) is arranged inside the protective cap (4). The fixed seat (3) is fixedly connected to the inner wall of the boiler wind cap (1).
5. A wind cap for a biomass circulating fluidized bed boiler according to claim 4, characterized in that, A plurality of guide seats (301) are fixedly connected to the outer wall of the fixed seat (3).
6. The wind cap of a biomass circulating fluidized bed boiler according to claim 5, characterized in that The guide seat (301) is slidably connected to the connecting seat (5).
7. A wind cap for a biomass circulating fluidized bed boiler according to claim 6, characterized in that, A limiting block (302) is fixedly connected to one end of the guide seat (301) away from the fixed seat (3). The limiting block (302) is in contact with the connecting seat (5).