Air distribution device of circulating fluidized bed sludge incinerator

Abstract

The utility model discloses an air distribution device of a circulating fluidized bed sludge incinerator, which comprises a hearth, a slag discharge port arranged in the middle of the hearth, an air distribution box arranged at the lower part of the hearth, a plurality of air cap groups uniformly distributed along the axis of the hearth and arranged on the surface of the hearth, and the air cap groups comprise a plurality of first furnace air caps and a plurality of second furnace air caps, the first furnace air cap and the second furnace air cap are arranged at an interval, the first furnace air cap and the second furnace air cap are both communicated with the interior of the air distribution box, air outlet channels are arranged on the peripheral sides of the first furnace air cap and the second furnace air cap, and metal balls are arranged in the second furnace air cap, can move up and down and are used for opening or closing the air outlet channel of the second furnace air cap. The metal ball is arranged in the second furnace air cap, when the air supply amount is large, air can push the metal ball to ascend, the air outlet channel of the metal ball is normally opened, when the air outlet amount is small, the second furnace air cap is closed, the air amount is concentrated at the first furnace air cap, and therefore it is guaranteed that the air amount at the first furnace air cap can blow up sludge.

Description

Technical Field

[0001] This utility model relates to the field of sludge incinerator technology, and more specifically, to an air distribution device for a circulating fluidized bed sludge incinerator. Background Technology

[0002] A circulating fluidized bed sludge incinerator is a device used to burn sludge. During operation, sludge enters the incinerator and is blown into the air by the air caps inside the incinerator, where it is burned. However, when the air supply decreases, due to the large number of air caps, uneven airflow from the air caps and low air volume at the air outlets can easily occur, making it difficult to effectively blow the sludge into the air. This causes the sludge to accumulate on the surface of the furnace and burn, thus affecting the combustion effect of the sludge. Therefore, there is an urgent need to improve this. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an air distribution device for a circulating fluidized bed sludge incinerator. By setting a metal ball inside the second furnace air cap, when the air supply is large, the gas can push the metal ball to rise, so that its air outlet channel can be opened normally. When the air supply is small, the second furnace air cap is closed, and the air volume is concentrated at the first furnace air cap, thereby ensuring that the air volume at the first furnace air cap can blow the sludge.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: an air distribution device for a circulating fluidized bed sludge incinerator, comprising a furnace chamber, a slag discharge port in the middle of the furnace chamber, an air distribution box in the lower part of the furnace chamber, and multiple air cap groups evenly distributed along the axis of the furnace chamber surface. Each air cap group includes multiple first furnace air caps and second furnace air caps, which are spaced apart. Both the first and second furnace air caps are connected to the interior of the air distribution box. Air outlet channels are provided around the first and second furnace air caps. A metal ball is provided inside the second furnace air cap, which can move up and down to open or close the air outlet channel of the second furnace air cap.

[0005] Furthermore, both the first furnace hood and the second furnace hood include a connecting pipe that is fixedly connected to the furnace chamber. A cap is threaded onto the upper part of the connecting pipe. The cap is higher than the upper surface of the furnace chamber. The air outlet channel is located around the cap and is inclined toward the upper surface of the furnace chamber.

[0006] Furthermore, a flow stabilizer is provided between the connecting pipe and the cap, and the flow stabilizer has multiple flow stabilizing holes.

[0007] Furthermore, the cap has an internal mounting cavity, the air outlet channel is located around the mounting cavity, the metal ball is located inside the mounting cavity of the second furnace hood, and the lower part of the metal ball abuts against the upper part of the flow stabilizer plate.

[0008] Furthermore, the outer side of the cap is provided with an annular platform, and the outer contour of the annular platform is hexagonal.

[0009] Furthermore, an installation groove is provided above the slag discharge port. The installation groove is located below the upper surface of the furnace. Multiple directional air caps are installed in the installation groove, which are evenly distributed along the slag discharge port. The directional air caps are L-shaped and have horizontal air outlets.

[0010] Furthermore, the air distribution box is divided into a first annular cavity, a second annular cavity, and a third annular cavity by partition ribs. The first annular cavity is connected to the directional air cap, the second annular cavity is connected to the air cap assembly, and a convex ring is provided on the upper outer side of the furnace. The convex ring has multiple air outlet areas on the side facing the furnace, and the air outlet areas are connected to the third annular cavity.

[0011] Furthermore, the lower part of the first annular cavity is connected to a first air inlet pipe, the lower part of the second annular cavity is connected to a second air inlet pipe, and the lower part of the third annular cavity is connected to a third air inlet pipe.

[0012] Furthermore, the air outlet area includes a first air outlet and a second air outlet located above the first air outlet. The first air outlet is inclined toward the upper surface of the furnace, and the second air outlet is located higher than the air cap assembly.

[0013] In summary, this utility model has the following beneficial effects:

[0014] When the gas supply is normal, the gas pressure can push the metal ball to the top of the installation cavity. At this time, the air outlet channel, connecting pipe and upper surface of the furnace in the second furnace hood are completely connected, and the hood assembly can all output gas normally to achieve sludge blowing and combustion. When the gas supply is low (such as when the equipment is just started or the gas supply equipment malfunctions), the gas pressure cannot push the metal ball to rise. At this time, the connecting pipe and air outlet channel in the second furnace hood are blocked by the metal ball, and the gas is concentrated to supply gas to the first furnace hood, ensuring the air output at the first furnace hood. The sludge can also be blown up and burned through the first furnace hood, greatly reducing the impact of the gas supply on sludge combustion and ensuring good equipment stability. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram of this embodiment from a first-view perspective;

[0016] Figure 2 This is a structural schematic diagram of this embodiment from a second perspective;

[0017] Figure 3 This is a cross-sectional view of this embodiment;

[0018] Figure 4 for Figure 3 Enlarged view at point A;

[0019] Figure 5 for Figure 3 Enlarged view at point B;

[0020] Figure 6 for Figure 3 Enlarged view at point C;

[0021] Figure 7 A cross-sectional view of the second furnace hood in its first state;

[0022] Figure 8 This is a cross-sectional view of the second furnace vent cap in the second state.

[0023] Reference numerals: 1. Furnace chamber; 11. Slag discharge port; 12. Mounting groove; 13. Raised ring; 14. Air outlet zone; 141. First air outlet; 142. Second air outlet; 15. First air inlet pipe; 16. Second air inlet pipe; 17. Third air inlet pipe; 2. Directional air cap; 3. Air cap assembly; 31. First furnace air cap; 32. Second furnace air cap; 4. Air distribution box; 41. First annular cavity; 42. Second annular cavity; 43. Third annular cavity; 44. Separating rib; 5. Connecting pipe; 6. Cap; 61. Mounting cavity; 62. Air outlet channel; 63. Annular platform; 7. Flow stabilizer; 8. Metal ball. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] like Figures 1 to 8As shown, this embodiment discloses an air distribution device for a circulating fluidized bed sludge incinerator, including a furnace 1. A slag discharge port 11 is provided in the center of the furnace 1. Multiple air cap groups 3 are evenly distributed along the axis of the furnace 1 on its surface. Each air cap group 3 includes multiple first furnace air caps 31 and second furnace air caps 32, which are spaced apart. Both the first furnace air caps 31 and the second furnace air caps 32 are connected to the interior of an air distribution box 4. Air outlet channels 62 are provided around the periphery of both the first furnace air caps 31 and the second furnace air caps 32. The interior of the second furnace air cap 32 is provided with… The metal ball 8 is movable up and down to open or close the air outlet channel 62 of the second furnace hood 32. Specifically, both the first furnace hood 31 and the second furnace hood 32 include a connecting pipe 5 fixedly connected to the furnace chamber 1. The upper part of the connecting pipe 5 is threaded with a cap 6. The cap 6 is higher than the upper surface of the furnace chamber 1. The air outlet channel 62 is located around the cap 6 and is inclined towards the upper surface of the furnace chamber 1. The cap 6 has an installation cavity 61 inside. The air outlet channel 62 is located around the installation cavity 61. The metal ball 8 is located in the installation cavity 61 of the second furnace hood 32.

[0026] When the gas supply is normal, the gas pressure can push the metal ball 8 to the top of the mounting cavity 61. At this time, the air outlet channel 62, the connecting pipe 5 and the upper surface of the furnace 1 in the second furnace hood 32 are completely connected, and the hood assembly 3 can all output gas normally to achieve the blowing and combustion of sludge. When the gas supply is low (such as when the equipment is just started or the gas supply equipment malfunctions), the gas pressure cannot push the metal ball 8 to rise. At this time, the connecting pipe 5 and the air outlet channel 62 in the second furnace hood 32 are blocked by the metal ball 8, and the gas is concentrated to supply gas to the first furnace hood 31 to ensure the air volume at the first furnace hood 31. The sludge can also be blown up and burned through the first furnace hood 31, which greatly reduces the impact of the gas supply on the sludge combustion and makes the equipment stable.

[0027] A flow stabilizer 7 is provided between the connecting pipe 5 and the cap 6. The flow stabilizer 7 has multiple flow stabilizing holes. The lower part of the metal ball 8 abuts against the upper part of the flow stabilizer 7. When the gas passes through the flow stabilizer 7, it can be dispersed and flow out from the flow stabilizing holes, thereby achieving stable gas flow and improving the uniformity of the air outlet 62.

[0028] The cap 6 has an annular platform 63 on its outer side. The annular platform 63 has a hexagonal outer contour. The connecting pipe 5 is threadedly connected to the cap 6. By setting the annular platform 63, the cap 6 can be easily disassembled and assembled, thereby facilitating the maintenance of the first furnace wind cap 31.

[0029] The slag discharge port 11 is provided with an installation groove 12 at its upper part. The installation groove 12 is located below the upper surface of the furnace 1. Multiple directional air caps 2 are evenly distributed along the slag discharge port 11 in the installation groove 12. The directional air caps 2 are L-shaped and the air outlets are set horizontally. The air outlets of the directional air caps 2 are lower than the air outlet channel 62. By setting the directional air caps 2, an air curtain will be formed above the slag discharge port 11. The principle of forming the air curtain is existing technology and will not be described in detail in this specification. This effectively reduces the discharge of sludge from the slag discharge port 11 during combustion, which is conducive to the complete combustion of sludge.

[0030] The lower part of the furnace chamber 1 is provided with an air distribution box 4. The air distribution box 4 is divided into a first annular cavity 41, a second annular cavity 42 and a third annular cavity 43 by a partition rib 44. The first annular cavity 41 is connected to the directional air cap 2, and the second annular cavity 42 is connected to the air cap assembly 3. The upper outer side of the furnace chamber 1 is provided with a convex ring 13. The convex ring 13 has multiple air outlet areas 14 on the side facing the furnace chamber 1. The air outlet area 14 is connected to the third annular cavity 43. The air outlet area 14 includes a first air outlet 141 and a second air outlet 142 located above the first air outlet 141. The first air outlet 141 is inclined towards the upper surface of the furnace chamber 1. The second air outlet 142 is located higher than the air cap assembly 3. The lower part of the first annular cavity 41 is connected to a first air inlet pipe 15. The lower part of the second annular cavity 42 is connected to a second air inlet pipe 16. The lower part of the third annular cavity 43 is connected to a third air inlet pipe 17.

[0031] The first air inlet pipe 15, the second air inlet pipe 16, and the third air inlet pipe 17 are connected to an external air supply device (not shown in the figure) and are supplied with air independently through the air supply device. That is, the first air inlet pipe 15, the first annular cavity 41, and the directional air cap 2 form a first airflow channel; the second air inlet pipe 16, the second annular cavity 42, and the air cap assembly 3 form a second airflow channel; and the third air inlet pipe 17, the third annular cavity 43, and the air outlet area 14 form a third airflow channel. The first air outlet 141 in the air outlet area 14 can blow air onto the upper surface of the furnace 1, thereby cleaning the upper surface of the furnace 1. The second air outlet 142 can blow air onto the air cap assembly 3, thereby cleaning the air cap assembly 3.

[0032] The working principle is as follows: During operation, air is supplied to the first air inlet pipe 15 and the second air inlet pipe 16 respectively. The gas flows out from the air cap group 3 and the directional air cap 2 respectively. The gas flowing out from the air cap group 3 can blow the sludge on the surface of the furnace 1 and burn it in the air. The gas flowing out from the directional air cap 2 can form an air curtain, which can block the blown sludge and effectively reduce the fall of incompletely burned sludge from the slag discharge port 11. When the sludge is fully burned, the air supply to the first air inlet pipe 15 can be reduced or stopped, so that the slag can be discharged from the slag discharge port 11. After the operation is completed, the air supply to the first air inlet pipe 15 and the second air inlet pipe 16 is stopped, and air is supplied to the third air inlet pipe 17 at the same time. The gas flows out from the first air outlet 141 and the second air outlet 142, respectively blowing and cleaning the upper surface of the furnace 1 and the surface of the air cap group 3. The blown-off slag is then discharged from the slag discharge port 11.

[0033] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. An air distribution device for a circulating fluidized bed sludge incinerator, characterized in that, The furnace includes a furnace chamber (1), a slag discharge port (11) in the middle of the furnace chamber (1), a wind distribution box (4) at the bottom of the furnace chamber (1), and a plurality of wind cap groups (3) evenly distributed along its axis on the surface of the furnace chamber (1). The wind cap group (3) includes a plurality of first furnace wind caps (31) and second furnace wind caps (32). The first furnace wind caps (31) and second furnace wind caps (32) are spaced apart. The first furnace wind caps (31) and second furnace wind caps (32) are both connected to the inside of the wind distribution box (4). The first furnace wind caps (31) and second furnace wind caps (32) are provided with air outlet channels (62) on their periphery. The second furnace wind cap (32) is provided with a metal ball (8) inside. The metal ball (8) can move up and down to open or close the air outlet channel (62) of the second furnace wind cap (32).

2. The air distribution device for a circulating fluidized bed sludge incinerator according to claim 1, characterized in that, The first furnace hood (31) and the second furnace hood (32) both include a connecting pipe (5) fixedly connected to the furnace chamber (1). The upper part of the connecting pipe (5) is threaded with a cap (6). The cap (6) is higher than the upper surface of the furnace chamber (1). The air outlet channel (62) is located around the cap (6) and is inclined toward the upper surface of the furnace chamber (1).

3. The air distribution device for a circulating fluidized bed sludge incinerator according to claim 2, characterized in that, A flow stabilizer plate (7) is provided between the connecting pipe (5) and the cap (6), and the flow stabilizer plate (7) is provided with multiple flow stabilizing holes.

4. The air distribution device for a circulating fluidized bed sludge incinerator according to claim 3, characterized in that, The cap (6) has an installation cavity (61) inside, the air outlet channel (62) is located around the installation cavity (61), the metal ball (8) is located in the installation cavity (61) of the second furnace air cap (32), and the lower part of the metal ball (8) abuts against the upper part of the flow stabilizer (7).

5. The air distribution device for a circulating fluidized bed sludge incinerator according to claim 2, characterized in that, The cap (6) has an annular platform (63) on its outer side, and the outer contour of the annular platform (63) is hexagonal.

6. The air distribution device for a circulating fluidized bed sludge incinerator according to claim 1, characterized in that, The slag discharge port (11) is provided with an installation groove (12) at the top. The installation groove (12) is located below the upper surface of the furnace (1). Multiple directional air caps (2) are evenly distributed along the slag discharge port (11) in the installation groove (12). The directional air caps (2) are L-shaped and the air outlets are set horizontally.

7. The air distribution device for a circulating fluidized bed sludge incinerator according to claim 6, characterized in that, The air distribution box (4) is divided into a first annular cavity (41), a second annular cavity (42) and a third annular cavity (43) by a partition rib (44). The first annular cavity (41) is connected to the directional air cap (2), and the second annular cavity (42) is connected to the air cap group (3). A convex ring (13) is provided on the upper outer side of the furnace (1). The convex ring (13) has multiple air outlet areas (14) on the side facing the furnace (1). The air outlet area (14) is connected to the third annular cavity (43).

8. The air distribution device for a circulating fluidized bed sludge incinerator according to claim 7, characterized in that, The lower part of the first annular cavity (41) is connected to a first air inlet pipe (15), the lower part of the second annular cavity (42) is connected to a second air inlet pipe (16), and the lower part of the third annular cavity (43) is connected to a third air inlet pipe (17).

9. The air distribution device for a circulating fluidized bed sludge incinerator according to claim 7, characterized in that, The air outlet area (14) includes a first air outlet (141) and a second air outlet (142) located above the first air outlet (141). The first air outlet (141) is inclined toward the upper surface of the furnace (1), and the second air outlet (142) is located higher than the air cap assembly (3).

Images