Bell-shaped hood of circulating fluidized bed boiler

Abstract

The utility model discloses a bell-shaped hood of a circulating fluidized bed boiler, which comprises a core tube and a bell-shaped outer cover covering the upper part of the core tube, the top of the core tube is sealed by a top plate, the upper end part of the side wall of the core tube is provided with a circle of inner holes communicated with an inner cavity of the core tube, the upper part of the core tube is provided with a left clamping block, a right clamping block and a supporting plate, the supporting plate is located below the two clamping blocks, the bell-shaped outer cover is hollow, the top of the bell-shaped outer cover is closed, an opening is formed in the lower end of the bell-shaped outer cover, a circle of outer holes communicated with a middle cavity of the bell-shaped outer cover are formed in the lower portion of the bell-shaped outer cover, and a left clamping groove and a right clamping groove are formed in the lower portion of the inner surface of the bell-shaped outer cover. The bottom face of the bell-shaped outer cover is provided with a left clamping groove inlet and a right clamping groove inlet corresponding to the two clamping blocks, the left clamping groove inlet and the right clamping groove inlet are communicated with the two clamping grooves respectively, the two clamping blocks are clamped into the left clamping groove and the right clamping groove through the left clamping groove inlet and the right clamping groove inlet respectively, and the bottom face of the bell-shaped outer cover makes contact with the supporting plate. The air chamber is more reasonable in structure, the outer cover can be effectively prevented from falling off, the service life is longer, and slag leakage of the air chamber is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of circulating fluidized bed boilers, and particularly relates to a bell-shaped air cap for a circulating fluidized bed boiler. Background Art

[0002] During the operation of a circulating fluidized bed boiler, a stable material circulation needs to be established, and the air cap on the air distribution plate is an important structural component to achieve this process. When the circulating fluidized bed boiler is working, it is necessary to ensure that air is evenly distributed across the entire furnace cross-section. On the premise of uniform fluidization of the material, fluidization dead zones should be avoided, and slag leakage into the air chamber should not occur.

[0003] There are many types of air caps, and the pigtail-shaped air cap, r-shaped air cap, arrow-shaped air cap, column-shaped air cap, and bell-shaped air cap have been widely used at home and abroad. Among them, the bell-shaped air cap is a type of air cap that is currently used more frequently. This air cap consists of a core pipe and an outer cover. The core pipe passes through the air distribution plate and is fixedly connected to the air distribution plate. A tuyere communicating with the inner cavity of the core pipe is arranged on the top surface of the core pipe. The air cap is fixed on the upper part of the core pipe, and several outer holes are opened around the outer cover of the air cap.

[0004] However, due to the improper structural design of the existing bell-shaped air cap, during the working process, the outer cover often falls off from the core pipe. When the outer cover falls off, slag will leak out from the tuyere on the top surface of the core pipe, causing slag leakage into the air chamber, uneven fluidization, and bed coking accidents.

[0005] Therefore, there is an urgent need in the prior art for a bell-shaped air cap for a circulating fluidized bed boiler with a longer service life and capable of effectively avoiding slag leakage into the air chamber. Summary of the Invention

[0006] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a bell-shaped air cap for a circulating fluidized bed boiler with a longer service life and capable of effectively avoiding slag leakage into the air chamber.

[0007] The purpose of the utility model is achieved through the following technical solutions: A bell-shaped air cap for a circulating fluidized bed boiler includes a core pipe and a bell-shaped outer cover covering the upper part of the core pipe. The top of the core pipe is closed by a top plate. A circle of inner holes communicating with the inner cavity of the core pipe is arranged at the upper end of the side wall of the core pipe. Two left and right clamping blocks and a support plate are arranged on the upper part of the core pipe. The support plate is located below the two clamping blocks. The bell-shaped outer cover is hollow, with a closed top and an opening at the lower end. A circle of outer holes communicating with the middle cavity of the bell-shaped outer cover is arranged at the lower part of the bell-shaped outer cover. Two left and right clamping grooves are arranged at the lower part of the inner surface of the bell-shaped outer cover. The bottom surface of the bell-shaped outer cover is provided with two left and right slot entrances corresponding to the two clamping blocks and communicating with the two clamping grooves respectively. The two clamping blocks are respectively clamped into the two clamping grooves through the two left and right slot entrances, and the bottom surface of the bell-shaped outer cover is in contact with the support plate.

[0008] The bottom of the bell-shaped outer cover is spot welded to the support plate.

[0009] A support ring is fixedly arranged at the lower part of the core tube.

[0010] The beneficial effects of the utility model are as follows: the structure of the utility model is more reasonable, which can effectively prevent the outer cover from falling off, has a longer service life, and avoids slag leakage in the air chamber. The outer cover and the core tube are connected by a self-locking buckle structure, which is convenient for installation and disassembly. Description of the Drawings

[0011] Figure 1 is the overall structural schematic diagram of the utility model;

[0012] Figure 2 is the sectional structural schematic diagram of the bell-shaped outer cover;

[0013] Figure 3 is the bottom surface structural schematic diagram of the bell-shaped outer cover;

[0014] Figure 4 is the sectional structural schematic diagram of the core tube;

[0015] Figure 5 is the structural schematic diagram of the upper part of the core tube.

[0016] In the figure: 1 - bell-shaped outer cover; 2 - outer hole; 3 - card slot; 4 - card slot entrance; 5 - core tube; 6 - inner hole; 7 - top plate; 8 - card block; 9 - support plate; 10 - support ring; 11 - opening. Detailed Embodiment

[0017] The following describes the present utility model in detail with reference to the drawings.

[0018] As Figures 1-5 shown, a bell-shaped wind cap of a circulating fluidized bed boiler includes a core tube 5 and a bell-shaped outer cover 1 covering the upper part of the core tube 5. The top of the core tube 5 is closed by a top plate 7. An inner hole 6 communicating with the inner cavity of the core tube 5 is provided at the upper end of the side wall of the core tube 5. Two left and right card blocks 8 and a support plate 9 are provided at the upper part of the core tube 5. The support plate 9 is located below the two card blocks 8. The bell-shaped outer cover 1 is hollow, with a closed top and an opening 11 at the lower end. An outer hole 2 communicating with the middle cavity of the bell-shaped outer cover 1 is provided at the lower part of the bell-shaped outer cover 1. Two left and right card slots 3 are provided on the lower part of the inner surface of the bell-shaped outer cover 1. Two left and right card slot entrances 4 communicating with the two card slots 3 respectively are provided on the bottom surface of the bell-shaped outer cover 1 corresponding to the two card blocks 8. The two card blocks 8 are respectively inserted into the two card slots 3 through the two left and right card slot entrances 4, and the bottom surface of the bell-shaped outer cover 1 is in contact with the support plate 9.

[0019] During operation, the air in the air chamber is successively sent into the furnace through the inner hole 6 of the core pipe 5 and the outer hole 2 of the air cap for fluidization and combustion. In the present utility model, the bell-shaped outer cover 1 is arranged on the core pipe 5 through the cooperation of the clamping block 8 and the clamping groove 3, and the connection method is relatively reliable, and the bell-shaped outer cover 1 is not likely to fall off during the working process. The bottom of the bell-shaped outer cover 1 is electrically welded to the support plate 9, and at the same time, two connection methods of clamping the clamping block 8 with the clamping groove 3 and welding are adopted to further improve the connection reliability and ensure the service life. The bell-shaped outer cover 1 is made of an alloy wear-resistant material, which can improve the service life.

[0020] Furthermore, the top of the core pipe 5 is closed by the top plate 7, and a circle of inner holes 6 is provided at the upper end of the side wall of the core pipe 5. During the working process, even if the bell-shaped outer cover 1 falls off, the slag is not likely to enter the core pipe 5 through the inner holes 6 on the side of the core pipe 5, avoiding slag leakage in the air chamber.

[0021] As Figure 1 , Figure 4 shown, a support ring 10 is fixedly arranged at the lower part of the core pipe 5. The core pipe 5 passes through the air distribution plate and is fixedly connected to the air distribution plate. The support ring 10 is supported on the air distribution plate, and the support ring 10 is welded to the air distribution plate to ensure the connection reliability.

[0022] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present utility model, rather than a limitation on the protection scope of the present utility model. Any simple modification or equivalent replacement made by those of ordinary skill in the art to the technical solution of the present utility model does not depart from the essence and scope of the technical solution of the present utility model.

Claims

1. A bell-shaped air cap for a circulating fluidized bed boiler, comprising a core tube and a bell-shaped outer cover placed on the upper part of the core tube, characterized in that: The top of the core tube is closed by a top plate. An inner hole communicating with the inner cavity of the core tube is provided at the upper end of the side wall of the core tube. Two left and right clamping blocks and a support plate are provided at the upper part of the core tube. The support plate is located below the two clamping blocks. The bell-shaped outer cover is hollow, with a closed top and an opening at the lower end. A ring of outer holes communicating with the middle cavity of the bell-shaped outer cover is provided at the lower part of the bell-shaped outer cover. Two left and right clamping grooves are provided at the lower part of the inner surface of the bell-shaped outer cover. The bottom surface of the bell-shaped outer cover is provided with two left and right slot entrances respectively communicating with the two clamping grooves corresponding to the two clamping blocks. The two clamping blocks are respectively clamped into the two left and right clamping grooves through the two left and right slot entrances. The bottom surface of the bell-shaped outer cover is in contact with the support plate.

2. The bell-shaped wind cap of a circulating fluidized bed boiler according to claim 1, characterized in that: The bottom of the bell-shaped outer cover is spot-welded to the support plate.

3. The bell-shaped wind cap of a circulating fluidized bed boiler according to claim 2, characterized in that: A support ring is fixedly arranged at the lower part of the core tube.

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