Low-nitrogen combustion self-locking hood of medium-temperature separation fluidized bed boiler
By designing a low-nitrogen combustion self-locking hood of medium-temperature separation fluidized bed boiler, using the self-locking principle and cyclone device, the existing hood has been solved, and the fluidization strength of the fluidized bed is achieved. Improved uniformity extends the service life of the equipment and reduces maintenance costs.
Patent Information
- Application Number
- CN202323418853.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-15
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2033-12-15
AI Technical Summary
The low-nitrogen combustion hood of the existing medium-temperature separation fluidized bed boiler has poor fluidization effect, ash leakage and wear problems, especially the poor fluidization effect of the side blowing hood, the lower blowing hood is easy to wear and the fluidized air uniformity cannot be achieved. Adjustment results in material loss and wear of the air chamber wall, which in severe cases causes the fluidized bed to stop running.
Design a medium-temperature separation fluidized bed boiler low-nitrogen combustion self-locking hood, including hood rod, casing, wear-resistant protective layer, ventilation hole, L-shaped boss, cyclone sheet and hood cover, adopting self-locking principle and rotating In the flow device, the depth of the hood rod inserting the sleeve is greater than the length of the sleeve, the cyclone sheet is inclined counterclockwise, and the wear-resistant protective layer is made of non-baked zirconium corundum material. The hood cover and the hood rod form a self-locking structure to avoid direct contact between the hood and the material.
The fluidization strength and uniformity of the fluidized bed are improved, which avoids the hood leakage, extends the service life of the equipment, reduces maintenance costs, and improves the reliability and fluidization effect of the equipment.
Smart Images
Figure CN222164777U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of boiler hoods, in particular to a low-nitrogen combustion self-locking hood for a medium-temperature separation fluidized bed boiler. Background Art
[0002] Fluidized bed is a widely used industrial device mainly used for gas-solid reaction, with a series of advantages such as simple structure, no moving parts, and uniform gas-solid mixing. One of the key components of its application is the air distribution plate, which is the bottom plate of the fluidized bed furnace. Its lower part is connected to the wind chamber. Its function is to support the materials in the fluidized bed furnace and make the gas in the wind chamber pass through the entire area of the air distribution plate evenly and enter the furnace. The main combustion area above the air distribution plate is the furnace bed, where the fluidization of the fuel and the low-nitrogen combustion reaction mainly occur. Existing hoods are mainly classified into down-blowing and side-blowing types according to the fluidization wind direction. When the side-blowing hood is used for low-nitrogen combustion in a medium-temperature separation fluidized bed boiler, its fluidization effect is not good, the material under the hood cannot be fully fluidized, and the accumulated materials are easy to wear the hood. Although the down-blowing hood has a good fluidization effect, the hood cap is easy to wear and the uniformity of the fluidizing wind cannot be adjusted. The connection between the hood cap and the hood rod is mainly classified into bell-shaped, embedded, welded, and threaded. The hoods with the above-mentioned connection types all have different degrees of ash leakage and poor fluidization effect. Ash leakage from the hood not only causes the loss of materials in the fluidized bed furnace, but also easily causes wear on the wall of the wind chamber. In severe cases, the wind chamber is filled with ash leakage, forcing the fluidized bed to stop operating. Based on this, the utility model proposes a self-locking hood for low-nitrogen combustion in a medium-temperature separation fluidized bed boiler. Utility Model Content
[0003] The utility model aims to provide a low-nitrogen combustion self-locking hood for a medium-temperature separation fluidized bed boiler to solve the above-mentioned problems.
[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:
[0005] The utility model discloses a self-locking hood for low-nitrogen combustion of a medium-temperature separation fluidized bed boiler, comprising a hood rod, a sleeve is arranged around the outer periphery of the lower end of the hood rod, the sleeve is welded to an air distribution plate, and a wear-resistant protective layer is arranged on the outer side of the sleeve; a plurality of ventilation holes are opened on the outer side wall of the upper end of the hood rod, and L-shaped bosses are arranged below the plurality of ventilation holes; a hood cover matching with the hood rod is arranged on the upper outer side of the hood rod, a groove matching with the L-shaped boss is opened on the inner side wall of the hood cover, and a plurality of swirl plates distributed in a circle are arranged on the inner side wall of the hood cover near the position of the lower fluidizing air outlet.
[0006] Furthermore, the depth of the hood rod inserted into the sleeve is greater than the length of the sleeve.
[0007] Furthermore, the top of the hood rod is a blind plugging structure.
[0008] Furthermore, a plurality of the swirl sheets are designed to be tilted counterclockwise and downward.
[0009] Furthermore, the wear-resistant protective layer is made of unbaked zirconium corundum wear-resistant plastic.
[0010] Compared with the prior art, the beneficial technical effects of the utility model are:
[0011] The utility model discloses a medium-temperature separation fluidized bed boiler with a low-nitrogen combustion self-locking hood, which does not require changes to the air distribution plate and casing structure of the medium-temperature separation fluidized bed boiler. The self-locking principle and device structure are simple, and are easy to obtain materials and manufacture, with low maintenance costs. While ensuring the fluidization intensity of the down-blowing hood, a swirl device is added to improve the fluidization uniformity. The self-locking principle adopted is simple and easy to manufacture, and the self-locking device does not contact the material and has high reliability. The fluidization effect of the medium-temperature separation fluidized bed boiler with low-nitrogen combustion is improved, and at the same time, ash leakage from the hood is avoided, thereby extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The utility model will be further described below in conjunction with the accompanying drawings.
[0013] Figure 1 This is the front view of the low-nitrogen combustion self-locking hood of the medium-temperature separation fluidized bed boiler of the utility model;
[0014] Figure 2 This is a structural diagram of the hood;
[0015] Figure 3 This is the front view of the hood rod;
[0016] Figure 4 Install structural drawings for hood rods and hood covers;
[0017] Figure 5 Bottom view of the hood rod and hood cover installation structure;
[0018] Figure 6 A perspective view of the installation structure for the hood rod and hood cover;
[0019] Explanation of the accompanying drawings: 1. hood rod; 2. hood cover; 3. wear-resistant protective layer; 4. sleeve; 5. ventilation hole; 6. L-shaped boss; 7. swirl sheet; 8. groove. DETAILED DESCRIPTION
[0020] like Figure 1-6 As shown, a low-nitrogen combustion self-locking hood for a medium-temperature separation fluidized bed boiler includes a hood rod 1, a sleeve 4 is welded around the outer periphery of the lower end of the hood rod 1, the sleeve 4 is welded to an air distribution plate, and the sleeve 4 is fully welded and fixedly connected to the air distribution plate on both sides.
[0021] The outer side of the sleeve 4 is provided with a wear-resistant protective layer 3, and the wear-resistant protective layer 3 is made of a non-baking zirconium corundum wear-resistant plastic. Since the fluidization wind direction of the low-nitrogen combustion self-locking wind cap of the medium-temperature separation fluidized bed boiler in this embodiment is the lower fluidization, in order to prevent the fluidized wind and materials from scouring the water-cooled wall and the air distribution plate, the air distribution plate and the water-cooled wall need to be wear-resistantly protected. The non-baking zirconium corundum wear-resistant plastic has a high aluminum oxide content, excellent wear resistance and temperature resistance, and is easy to construct without molding. After the construction is completed, it can be simply maintained by dry method without the need for a baking furnace, and has a long service life.
[0022] A plurality of ventilation holes 5 are provided on the outer side wall of the upper end of the hood rod 1, specifically three rows of φ8 and evenly distributed. An L-shaped boss 6 is installed below the plurality of ventilation holes 5. A hood cover 2 matching with the hood rod 1 is installed on the upper outer side of the hood rod 1, and the top of the hood cover 2 is also a blind plug structure. A groove 8 matching with the L-shaped boss 6 is provided on the inner side wall of the hood cover 2. The L-shaped boss 6 matches the groove 8 in size, and the boss height is greater than the groove depth, which can play a positioning role during the installation process.
[0023] A plurality of swirl blades 7 distributed in a circumference are installed on the inner wall of the hood cover 2 near the downflow tuyere.
[0024] The depth of the hood rod 1 inserted into the sleeve 4 is greater than the length of the sleeve 4, ensuring the installation strength of the hood rod. Specifically, the gap between the hood rod 1 and the sleeve 4 is uniform to prevent the hood 1 from being deflected, and at the same time, the fluidizing air is preferentially contacted with the hood rod 1 to prevent the fluidizing air from forming turbulence in the sleeve 4.
[0025] In this embodiment, the top of the hood rod 1 is a blind plug structure, and the whole is cast in one piece to ensure strength and service life.
[0026] The plurality of swirl blades 7 are designed to be tilted counterclockwise downward with an inclination angle of 8° to ensure uniform fluidization.
[0027] The action process of the utility model is as follows:
[0028] After the equipment is running, the hood adopts the downward air flow method of the hood cover 2, and the air enters under the gravity of the hood cover 2. Under the reverse force of the swirl sheet 7 at the lower part of the hood cover 2, the groove 8 is affected by the vertical downward force and the horizontal force, and the L-shaped boss 6 of the hood rod 1 is pressed, so that the hood rod 1 and the hood cover 2 form a self-locking.
[0029] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.
Claims
1. A medium temperature separation fluidized bed boiler low nitrogen combustion self-locking hood, characterized by: It comprises a hood rod (1), a sleeve (4) is arranged around the outer periphery of the lower end of the hood rod (1), the sleeve (4) is welded to the air distribution plate, and a wear-resistant protective layer (3) is arranged on the outer side of the sleeve (4); a plurality of ventilation holes (5) are provided on the outer side wall of the upper end of the hood rod (1), and an L-shaped boss (6) is arranged below the plurality of ventilation holes (5); a hood cover (2) matching therewith is arranged on the upper outer side of the hood rod (1), a groove (8) matching the L-shaped boss (6) is arranged on the inner side wall of the hood cover (2), and a plurality of swirl plates (7) distributed in a circular pattern are arranged on the inner side wall of the hood cover (2) near the downstream air outlet.
2. The low-nitrogen combustion self-locking hood of the medium-temperature separation fluidized bed boiler according to claim 1 is characterized by: The depth of the hood rod (1) inserted into the sleeve (4) is greater than the length of the sleeve (4).
3. The low-nitrogen combustion self-locking hood of the medium-temperature separation fluidized bed boiler according to claim 1 is characterized by: The top of the hood rod (1) is a blind plugging structure.
4. The low-nitrogen combustion self-locking hood of the medium-temperature separation fluidized bed boiler according to claim 1 is characterized by: The plurality of swirl blades (7) are designed to be tilted counterclockwise and downward.
5. The low-nitrogen combustion self-locking hood of the medium-temperature separation fluidized bed boiler according to claim 1 is characterized by: The wear-resistant protective layer (3) is made of a non-baking zirconium corundum wear-resistant plastic material.