Composite hood for circulating fluidized bed boiler

Abstract

The utility model relates to the technical field of combustors, in particular to a composite hood for a circulating fluidized bed boiler. Comprising a hood rod and a hood cover, a connector is arranged on the top of the hood rod in a protruding mode, the middle of the hood cover is of a hollow structure, air outlets are formed in the periphery of the lower portion of the hood cover at equal intervals, a through hole matched with the connector is formed in the center of the top of the hood cover, the top of the hood rod is located in the hood cover, and the connector penetrates through the through hole; a cover plate is attached to the top of the hood cover, and the bottom of the cover plate is fixedly connected with the connector. The wear resistance, corrosion resistance and high temperature resistance of the wind cap are guaranteed through the wind cap cover made of the silicon carbide ceramic material, then the cover plate and the connector of the wind cap rod are welded, the wind cap cover is clamped in the middle to be fixed, the top of the wind cap rod is protected through the cover plate, and the service life of the wind cap is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of air hoods for circulating fluidized bed boilers, in particular to a composite air hood for circulating fluidized bed boilers. Background Art

[0002] It is of great significance to develop new combustion technologies and improve the operating efficiency of energy-consuming equipment.

[0003] Existing hoods used in circulating fluidized bed boilers are cast from heat-resistant and wear-resistant steel. These hoods distribute air evenly, prevent wear, and prevent slag leakage. However, hoods made of heat-resistant and wear-resistant steel are not wear-resistant, corrosion-resistant, or oxidation-resistant, resulting in a short service life and requiring replacement every 1-3 months, causing significant economic losses. Damage to cast steel hoods can lead to uneven air distribution, altered airflow direction, and slag leakage.

[0004] The prior art 201721746930.7 discloses a hood, including a hood body, which is a long cylinder with a hollow structure inside. The lower bottom surface is provided with an air inlet hole, and the upper bottom surface is provided with a connecting hole, which is connected to the hollow structure; the circumferential side of the hood body is provided with a plurality of openings, which are connected to the hollow structure. The material of the hood body is silicon carbide material. Although it effectively solves the defects of traditional cast steel that are not wear-resistant, corrosion-resistant, and not resistant to high temperatures, when the hood blows up the coal, the falling coal will hit the top of the hood, causing damage to the top of the hood. Utility Model Content

[0005] The utility model aims to solve the above problems, thereby providing a composite hood for a circulating fluidized bed boiler which increases the service life of the hood.

[0006] The utility model solves the above problems by adopting the following technical solutions:

[0007] A composite hood for a circulating fluidized bed boiler comprises a hood rod and a hood cover, a connector protruding from the top of the hood rod, a hollow structure in the middle of the hood cover and air outlets equally spaced on the lower periphery, a through hole adapted to the connector being provided at the center of the top of the hood cover, the top of the hood rod being located inside the hood cover and the connector passing through the through hole, the hood cover being made of silicon carbide ceramic material, a cover plate being fitted on the top of the hood cover, and the bottom of the cover plate being fixedly connected to the connector.

[0008] Compared with the prior art, the present invention adopting the above technical solution has the following outstanding features:

[0009] The hood cover is made of silicon carbide ceramic material to ensure the wear resistance, corrosion resistance and high temperature resistance of the hood. Then the cover plate and the hood rod are welded together to fix the hood cover in the middle, and the top of the hood rod is protected by the cover plate to ensure the service life of the hood.

[0010] As a preferred embodiment, a further technical solution of the present invention is:

[0011] Furthermore, the cover plate is annular and has a welding hole in the middle, and the diameter of the cover plate is larger than the diameter of the hood cover.

[0012] Furthermore, the cover plate is made of heat-resistant cast steel.

[0013] Furthermore, the air outlet is arranged to be tilted downward from the inside to the outside. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the main cross-sectional structure of an embodiment of the utility model;

[0015] The components marked in the figure are: hood rod 1, connector 11, hood cover 2, air outlet 21, and cover plate 3. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with embodiments, the purpose of which is only to provide a better understanding of the content of the present invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0017] A composite hood for a circulating fluidized bed boiler comprises a hood rod 1 and a hood cover 2. A connector 11 is protruding from the top of the hood rod 1. The middle portion of the hood cover 2 is a hollow structure and air outlets 21 are evenly spaced on the lower periphery. A through hole adapted to the connector 11 is provided at the center of the top of the hood cover 2. The top of the hood rod 1 is located inside the hood cover 2 and the connector 11 passes through the through hole. The material of the hood cover 2 is silicon carbide ceramic material. A cover plate 3 is fitted on the top of the hood cover 2, and the bottom of the cover plate 3 is fixedly connected to the connector 11.

[0018] Furthermore, the cover plate 3 is annular and has a welding hole in the middle. The diameter of the welding hole is smaller than the diameter of the connector 11 , and the diameter of the cover plate 3 is larger than the diameter of the hood cover 1 , thereby fully protecting the top of the hood cover 1 .

[0019] Furthermore, the cover plate 3 is made of heat-resistant cast steel, which has excellent high-temperature performance and strong corrosion resistance.

[0020] Furthermore, the air outlet 21 is arranged to be tilted downward from the inside to the outside.

[0021] The hood cover is made of silicon carbide ceramic material to ensure the wear resistance, corrosion resistance and high temperature resistance of the hood. Then the cover plate and the hood rod are welded together to fix the hood cover in the middle, and the top of the hood rod is protected by the cover plate to ensure the service life of the hood.

[0022] The above description is only a preferred embodiment of the present invention and does not limit the scope of the present invention. Any equivalent changes made using the contents of the present invention specification and its drawings are included in the scope of the present invention.

Claims

1. A composite hood for a circulating fluidized bed boiler, comprising a hood rod and a hood cover, wherein a connector protrudes from the top of the hood rod, the hood cover is hollow in the middle and has air outlets spaced evenly around the lower periphery, and a through hole is provided at the center of the top of the hood cover to fit the connector, characterized in that: The top of the hood rod is located inside the hood cover and the connecting head passes through the through hole. The material of the hood cover is silicon carbide ceramic material. A cover plate is fitted on the top of the hood cover. The bottom of the cover plate is fixed to the connecting head. The cover plate is annular and has a welding hole in the middle. The diameter of the cover plate is larger than the diameter of the hood cover, and the air outlet is tilted downward from the inside to the outside.

2. The composite hood for a circulating fluidized bed boiler according to claim 1, characterized in that: The cover is made of heat-resistant cast steel.

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