A fuel gas co-firing nozzle for use in fluidized bed boilers

Abstract

This utility model discloses a fuel gas co-firing nozzle for use in fluidized bed boilers, belonging to the technical field of fluidized bed boiler equipment. It includes a flame shield, a fixed plate, a rotating plate, a slider, a connecting rod, and support bars. The fixed plate has straight grooves, and the rotating plate has inclined grooves. Under the combined constraint of the straight and inclined grooves, the slider converts the rotational motion of the rotating plate into synchronous angle changes of multiple support bars, achieving rapid and synchronous height adjustment. The nozzle mechanism includes a main nozzle and two cross-arranged compensation nozzles (I and II). Fuel is obtained through a diversion pipe, and the combustion-supporting gas is guided by a guide plate to achieve multi-point three-dimensional flame heating. This utility model has an ingenious structure, which not only makes the support height adjustment operation convenient and synchronized, but also ensures uniform flame distribution and complete combustion, significantly improving heating efficiency and equipment adjustment stability.

Description

Technical Field

[0001] This utility model relates to the technical field of fluidized bed boiler equipment, and in particular to a fuel gas co-firing nozzle used in fluidized bed boilers. Background Technology

[0002] In the process of burning solid fuels, fluidized bed boilers sometimes need to co-fire gaseous fuels for ignition, combustion assistance, or stable combustion. This requires the use of specialized fuel gas co-firing nozzles. Existing fuel gas co-firing nozzles have a relatively simple structure, resulting in a concentrated flame pattern. This leads to excessively high temperatures in the area directly affected by the flame, while the temperature in the surrounding areas is relatively low, causing uneven heating of the boiler. Such localized high temperatures can damage stress components and shorten the service life of the equipment. In addition, the simple injection structure also results in poor mixing of fuel and combustion air, leading to incomplete combustion, which reduces thermal efficiency and causes fuel waste.

[0003] In some applications where the relative position of the nozzle and the heated body needs to be adjusted, the existing support and adjustment mechanisms are also inadequate. When the support height needs to be adjusted, the operator needs to adjust multiple support points one by one. The whole process is cumbersome and time-consuming. More importantly, when adjusting multiple support points independently, it is extremely difficult to ensure that the height of all support points is precisely consistent. This will cause the supported object to tilt, resulting in an unstable state and affecting the smoothness and safety of the adjustment process.

[0004] Therefore, this utility model proposes a fuel gas co-firing nozzle for use in fluidized bed boilers to overcome the shortcomings of the prior art. Utility Model Content

[0005] In view of the problems existing in the fuel gas co-firing device for fluidized bed boilers, such as uneven heating of the combustion nozzle, incomplete fuel combustion, and cumbersome structure of the support and adjustment mechanism that cannot be synchronously and smoothly adjusted, this utility model aims to provide a fuel gas co-firing nozzle and holder with an improved structure that can effectively solve the above problems for use in fluidized bed boilers.

[0006] This utility model provides a fuel gas co-firing nozzle for use in fluidized bed boilers, comprising: a flame shield, a nozzle mechanism, a fixing plate, a support bar, a rotating plate, a slider, and a connecting rod.

[0007] The fixing plate is fixed to the outer wall of the fireproof cover and has multiple straight grooves. The rotating plate is rotatably disposed at the bottom of the fireproof cover and has an inclined groove at the top.

[0008] Furthermore, the slider, the connecting rod, and the support bar are combined in the following manner: the main body of the slider slides in the straight groove, the lower end of the slider slides in the inclined groove, one end of the connecting rod is rotatably connected to the slider, and the other end of the connecting rod is rotatably connected to the middle of the support bar; the nozzle mechanism includes a main nozzle, and a compensation nozzle one and a compensation nozzle two arranged intersectingly around the main nozzle.

[0009] Preferably, the fuel gas co-firing nozzle and holder for use in fluidized bed boilers further includes a rotating handle, which is connected to the side wall of the rotating plate and is used to drive the rotating plate to rotate.

[0010] Preferably, the fuel gas co-firing nozzle and holder for use in fluidized bed boilers further includes an adjusting plate, a locking block, and a positioning pin. The adjusting plate is fixed to the fixed plate, the locking block is disposed on the rotating plate, and the positioning pin is adapted to be inserted into the adjusting plate and pass through the locking block to fix the relative position of the rotating plate and the fixed plate.

[0011] Preferably, the nozzle mechanism further includes an air intake pipe, a buffer chamber, and a diversion pipe. After the fuel gas enters the buffer chamber through the air intake pipe, a portion of the fuel enters the first compensation nozzle and the second compensation nozzle through the diversion pipe, while the other portion of the fuel directly enters the main nozzle.

[0012] Preferably, the air intake pipe is equipped with a valve for controlling the flow rate of the input gas.

[0013] Preferably, the nozzle mechanism further includes an inner ring and a guide plate, the guide plate being fixed between the inner ring and the main nozzle for guiding the combustion-supporting gas.

[0014] Preferably, the top surface of the fixing plate has a plurality of support bars arranged in a circular array, and the fixing plate has a plurality of straight grooves corresponding to the number of support bars.

[0015] Preferably, the slider is simultaneously confined within the straight groove and the inclined groove, so that when the rotating plate rotates, the slider is restricted to sliding only along the length direction of the straight groove.

[0016] This utility model has the following beneficial effects: 1. This utility model, by setting up a linkage mechanism consisting of a rotating plate, a slider, a connecting rod and a support bar, and utilizing the combined constraint of inclined groove and straight groove, transforms a single rotation operation into a synchronous and stable angle change of multiple support bars, solving the problems of complex structure, inconvenient operation and poor synchronization of existing adjustment mechanisms, and realizing fast, stable and synchronous adjustment of support height.

[0017] 2. This utility model solves the problems of uneven heating and incomplete fuel combustion in existing single-nozzle burners by setting up a multi-nozzle system consisting of a main nozzle, a cross-arranged compensation nozzle one and compensation nozzle two, and a guide plate for guiding the combustion-supporting gas. It achieves uniform flame distribution, high thermal efficiency and complete combustion. Attached Figure Description

[0018] Figure 1 This is a front perspective view of a fuel gas co-firing nozzle for use in a fluidized bed boiler, as proposed in this utility model. Figure 2 This is a partial structural exploded view of a fuel gas co-firing nozzle for use in a fluidized bed boiler, as proposed in this utility model. Figure 3 This is a partial structural exploded view of a fuel gas co-firing nozzle for use in a fluidized bed boiler, as proposed in this utility model. Figure 4 This is a partial structural diagram of a fuel gas co-firing nozzle for use in a fluidized bed boiler, as proposed in this utility model. Figure 5 This is a partial structural diagram of a fuel gas co-firing nozzle for use in a fluidized bed boiler, as proposed in this utility model.

[0019] Legend: 1. Fireproof cover; 2. Nozzle mechanism; 201. Inner ring; 202. Guide plate; 203. Main nozzle; 204. Compensating nozzle one; 205. Compensating nozzle two; 206. Buffer chamber; 207. Air inlet pipe; 208. Diversion pipe; 209. Valve; 3. Fixing plate; 4. Straight groove; 5. Support bar; 6. Connecting rod; 7. Sliding block; 8. Rotating plate; 9. Inclined groove; 10. Rotating handle; 11. Locking block; 12. Adjusting plate; 13. Positioning pin. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Example

[0021] Please refer to Figures 1 to 5This utility model provides a fuel gas co-firing nozzle for use in a fluidized bed boiler, including a fireproof cover 1 as a basic support component and a nozzle mechanism 2 disposed inside the fireproof cover 1. The nozzle mechanism 2 is used to generate and spray fuel flames. A mounting mechanism for supporting the boiler and adjusting its height is provided on the periphery of the fireproof cover 1. The mounting mechanism is based on a fixing plate 3, which is firmly fixed to the outer wall of the fireproof cover 1 by bolts or welding. The top surface of the fixing plate 3 has multiple radially distributed straight grooves 4. Multiple support bars 5 are arranged in a circumferential array on the top surface of the fixing plate 3, and the bottom of the support bars 5 is rotatably connected to the top surface of the fireproof cover 1. The movable plate 8 is rotatably mounted at the bottom of the fireproof cover 1, and multiple inclined grooves 9 are provided on the top surface of the movable plate 8. A rotating handle 10 is also connected to the outer side wall of the movable plate 8. The operator can drive the movable plate 8 to rotate around the central axis by operating the rotating handle 10. The slider 7 is a key component of the linkage mechanism. The main body of the slider 7 is slidably fitted in the straight groove 4 of the fixed plate 3, while the lower end of the slider 7 is slidably connected in the inclined groove 9 of the movable plate 8. One end of the connecting rod 6 is rotatably connected to the slider 7 through a pin, and the other end of the connecting rod 6 is also rotatably connected to the middle of the support bar 5 through a pin, thereby converting the radial linear motion of the slider 7 into the angular swing of the support bar 5.

[0022] To lock the adjusted height, the fuel gas co-firing nozzle and holder used in fluidized bed boilers also include an adjusting plate 12, a locking block 11, and a positioning pin 13. The adjusting plate 12 is fixed to the fixing plate 3 and has multiple holes. The locking block 11 is located on the rotating plate 8. The positioning pin 13 is adapted to be inserted into the holes of the adjusting plate 12 and pass through the locking block 11, thereby locking the rotating plate 8. The nozzle mechanism 2 includes a main nozzle 203 as the core of the gas injection and compensation nozzles 204 arranged intersecting around the main nozzle 203. The second compensating nozzle 205, in order to achieve efficient supply and mixing of gas, the nozzle mechanism 2 also includes an air intake pipe 207, on which a valve 209 is provided. A buffer chamber 206 is connected to the end of the air intake pipe 207. A diversion pipe 208 is led out from the buffer chamber 206 and connected to the first compensating nozzle 204 and the second compensating nozzle 205 respectively. In order to promote combustion, the nozzle mechanism 2 also has an inner ring 201 and a guide plate 202 inside. The guide plate 202 is fixed between the inner ring 201 and the main nozzle 203.

[0023] Please refer to Figure 1 , Figure 3 and Figure 4The rotating plate 8 serves as the driving source and is rotatably mounted at the bottom of the fireproof cover 1. The top surface is machined with multiple inclined grooves 9 distributed along a specific curve. The groove walls of the inclined grooves 9 are smooth and are used to guide the lower end of the slider 7 to slide inside. The rotating plate 8 is rotatably connected to the central axis at the bottom of the fireproof cover 1 through the central shaft hole. When rotating, it can push multiple sliders 7 to generate synchronous radial displacement through the side wall of the inclined grooves 9.

[0024] The top surface of the fixed plate 3 is provided with multiple strictly radially distributed straight grooves 4. The main body of the slider 7 is slidably embedded in the straight grooves 4, ensuring that the movement trajectory of the slider 7 is strictly limited to the radial direction and cannot deflect. One end of the connecting rod 6 is rotatably connected to the upper ear of the slider 7 through a pin, and the other end of the connecting rod 6 is rotatably connected to the middle of the support bar 5 through a pin. The bottom of the support bar 5 is also rotatably connected to the top surface of the fireproof cover 1 through a pin structure. In the assembled state, the slider 7 is simultaneously confined within the straight grooves 4 and the inclined grooves 9. When the rotating plate 8 rotates around the central axis, the inclined grooves 9... The side wall applies a tangential force to the slider 7. Since the slider 7 is restricted to radial movement by the straight groove 4, this force is converted into a driving force that pushes or pulls the slider 7 to slide radially along the straight groove 4. The radial displacement of the slider 7 is transmitted to the middle of the support bar 5 through the connecting rod 6, which in turn pushes the support bar 5 to swing around the bottom rotation point, thereby changing the height of the top of the support bar 5. Since all the sliders 7, connecting rods 6 and support bars 5 have the same structure and linkage relationship, and are driven by the same rotating plate 8, the angle changes of all support bars 5 can be precisely synchronized, ensuring the stability of the boiler during the lifting and lowering process.

[0025] In order to drive the rotation of the rotating plate 8, a rotating handle 10 is fixedly connected to the side wall of the rotating plate 8. The user can easily apply torque by manually operating the rotating handle 10 to drive the rotating plate 8 to rotate, thereby realizing the entire height adjustment process.

[0026] As a preferred embodiment, in order to reliably lock the support height after adjustment and prevent height changes due to vibration or accidental contact, refer to Figure 1 and Figure 4 The fuel gas co-firing nozzle and mounting bracket used in fluidized bed boilers also include an adjusting plate 12, a locking block 11, and a positioning pin 13. The adjusting plate 12 is fixed to the side of the fixing plate 3 by bolts or welding. Multiple rows of holes are evenly distributed along the circumference of the adjusting plate 12. The locking block 11 is fixedly connected to the outer edge of the rotating plate 8 and rotates synchronously with the rotating plate 8. When the target height is reached, the locking block 11 can be rotated to a position aligned with a row of holes on the adjusting plate 12. Then, the positioning pin 13 passes through the holes on the adjusting plate 12 and the through holes on the locking block 11 in sequence to fix the rotating plate 8 relative to the stationary adjusting plate 12, thereby preventing any rotation of the rotating plate 8 and finally achieving stable locking of the angle of the support bar 5.

[0027] As another preferred embodiment, in order to achieve uniform fuel supply and efficient combustion, refer to Figure 2 and Figure 5 The nozzle mechanism 2 is designed with a precise gas distribution and combustion-supporting structure. The nozzle mechanism 2 also includes an intake pipe 207, a buffer chamber 206, and a diversion pipe 208. Multiple streams of mixed fuel gas are input from the bottom end of the intake pipe 207. A valve 209 is installed on the intake pipe 207. The valve 209 is used to precisely control the total flow rate of the input fuel gas. After passing through the valve 209, the fuel gas enters the buffer chamber 206. The buffer chamber 206 has a large volume, which allows the gas to be fully mixed and the pressure to be stabilized. After buffering, the fuel gas is divided into two paths. One part enters the main nozzle 203 connected to it directly from the top of the buffer chamber 206. The other part is transported to the compensation nozzle 1 204 and compensation nozzle 205 through the diversion pipe 208 led out from the side wall of the buffer chamber 206. This design ensures that both the main and auxiliary nozzles can obtain a stable gas supply.

[0028] As another preferred embodiment, in order to further improve combustion efficiency and make fuel combustion more complete, refer to Figure 5 The nozzle mechanism 2 also includes an inner ring 201 and a guide plate 202. The inner ring 201 serves as the internal skeleton component of the nozzle mechanism 2. The main nozzle 203, the first compensation nozzle 204, and the second compensation nozzle 205 are all installed on the inner ring 201. The guide plate 202 is an annular plate and is fixed between the inner ring 201 and the main nozzle 203 by welding or snap-fitting. The guide plate 202 can effectively guide the surrounding combustion gas to the flame root of the main nozzle 203 when the nozzle is working, thereby enhancing the mixing effect of fuel and combustion gas.

[0029] Working principle: When adjusting the boiler's support height, first pull out the positioning pin 13 to release the lock on the rotating plate 8. Then, manually operate the rotating handle 10 to apply torque, causing the rotating plate 8 to rotate around its central axis. Since the lower part of the slider 7 is fitted into the inclined groove 9 of the rotating plate 8, and the main body of the slider 7 is restricted in the straight groove 4 of the fixed plate 3, when the rotating plate 8 rotates, the inclined groove 9 pushes the slider 7, forcing the slider 7 to slide linearly only along the radial direction defined by the straight groove 4. This converts the rotational motion of the rotating plate 8 into the synchronous radial motion of multiple sliders 7. Moving in a straight line, the radial displacement of the slider 7 is transmitted to the middle of the support bar 5 through the rotating connecting rod 6. Since the bottom of the support bar 5 is rotatably connected to the top surface of the fireproof cover 1, the pushing or pulling force applied by the connecting rod 6 will cause the support bar 5 to swing around the bottom fulcrum, thereby changing the angle between the support bar 5 and the horizontal plane, and finally realizing the synchronous raising or lowering of the top height of the support bar 5. After adjusting to the required height, the positioning pin 13 is re-inserted into the corresponding hole of the adjusting plate 12 and passes through the locking block 11, so that the rotating plate 8 can be stably locked to prevent accidental rotation. During combustion, multiple streams of mixed fuel gas enter the device through the intake pipe 207. The total intake volume can be controlled by adjusting the valve 209. The fuel gas first enters the buffer chamber 206 for pressure stabilization and secondary mixing. Then, a portion of the fuel gas directly enters the main nozzle 203 to form the central main flame, while the other portion is evenly distributed through the diversion pipe 208 to the cross-arranged compensation nozzles 1 204 and 2 205 to form a surrounding auxiliary flame. The main nozzle 203 and multiple compensation nozzles 1 204 and 2 205 work together to inject fuel, forming a multi-point, three-dimensional flame heating zone with a wider coverage area. This makes the heat distribution at the bottom of the boiler more uniform and avoids local overheating. At the same time, the guide plate 202 set between the inner ring 201 and the main nozzle 203 can actively guide the surrounding combustion air to the root of the flame by using the negative pressure generated by the injection, ensuring that the fuel and air are fully mixed, thereby achieving efficient and complete combustion.

Claims

1. A fuel gas co-combustion nozzle for use in a fluidized bed boiler, comprising: Fireproof cover (1) and nozzle mechanism (2) disposed inside the fireproof cover (1); Its features are, It also includes a fixed plate (3), multiple support bars (5), a rotating plate (8), a slider (7) and a connecting rod (6). The fixed plate (3) is fixed to the outer wall of the fireproof cover (1) and has multiple straight grooves (4). The bottom of the support bar (5) is rotatably connected to the top surface of the fireproof cover (1). The rotating plate (8) is rotatably set at the bottom of the fireproof cover (1). The top of the rotating plate (8) has an inclined groove (9). The lower end of the slider (7) slides in the inclined groove (9). The main body of the slider (7) slides in the straight groove (4). One end of the connecting rod (6) is rotatably connected to the slider (7). The other end of the connecting rod (6) is rotatably connected to the middle part of the support bar (5). The nozzle mechanism (2) includes a main nozzle (203) and two compensation nozzles (204 and 205) arranged intersecting around the main nozzle (203).

2. A fuel gas co-combustion nozzle for use in a fluidized bed boiler according to claim 1, characterized in that It also includes a rotating handle (10), which is connected to the side wall of the rotating plate (8) and is used to drive the rotating plate (8) to rotate.

3. The fuel gas mixing burner for fluidized bed boiler according to claim 1, characterized in that, It also includes an adjusting plate (12), a locking block (11) and a positioning pin (13). The adjusting plate (12) is fixed to the fixed plate (3) and has multiple holes. The locking block (11) is located on the rotating plate (8). The positioning pin (13) is adapted to be inserted into the hole of the adjusting plate (12) and passes through the locking block (11) to fix the relative position of the rotating plate (8) and the fixed plate (3).

4. The fuel gas co-combustion nozzle for fluidized bed boilers according to claim 1, characterized in that, The nozzle mechanism (2) also includes an air intake pipe (207), a buffer chamber (206), and a diversion pipe (208). After the fuel gas enters the buffer chamber (206) through the air intake pipe (207), part of the fuel enters the compensation nozzle one (204) and the compensation nozzle two (205) through the diversion pipe (208), and the other part of the fuel directly enters the main nozzle (203).

5. A fuel gas co-combustion nozzle for use in a fluidized bed boiler according to claim 4, characterized in that The intake pipe (207) is equipped with a valve (209) for controlling the flow rate of the input gas.

6. A fuel gas co-combustion nozzle for use in a fluidized bed boiler according to claim 1, characterized in that, The nozzle mechanism (2) also includes an inner ring (201) and a guide plate (202), the guide plate (202) being fixed between the inner ring (201) and the main nozzle (203).

7. The fuel gas co-combustion nozzle for fluidized bed boilers according to claim 1, characterized in that, The top surface of the fixing plate (3) has a plurality of support bars (5) arranged in a circular array, and the fixing plate (3) has a plurality of straight grooves (4) corresponding to the number of support bars (5).

8. A fuel gas co-combustion nozzle for use in a fluidized bed boiler according to claim 1, characterized in that, The slider (7) is simultaneously confined within the straight groove (4) and the inclined groove (9) so that when the rotating plate (8) rotates, the slider (7) is restricted to sliding only along the length direction of the straight groove (4).

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