Circulating fluidized bed boiler with bed material screening structure

Abstract

The utility model relates to the technical field of circulating fluidized bed boilers, in particular to a circulating fluidized bed boiler with a bed material screening structure, which comprises a boiler body, a spiral conveyor, a feeding hopper, two collecting mechanisms and a screening mechanism. The feeding hopper is connected with the spiral conveyor through a conveying pipe, the screening mechanism is fixedly installed on the feeding hopper and used for screening bed materials, the two collecting mechanisms are both fixedly installed on the feeding hopper, and the collecting mechanisms are used for collecting the screened bed materials. According to the circulating fluidized bed boiler with the bed material screening structure, secondary screening can be conducted on bed materials through the arranged screening mechanism, so that it is guaranteed that the granularity of the bed materials is kept uniform, the needed size is achieved, the fluidization quality of the circulating fluidized bed boiler is improved, the using effect of the boiler is improved, and the efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of circulating fluidized bed boiler technology, and specifically to a circulating fluidized bed boiler equipped with a bed material screening structure. Background Technology

[0002] Circulating fluidized bed boilers are a type of high-efficiency, low-pollution clean combustion boiler. Based on the principle of fluidized bed combustion, solid fuels are burned in a fluidized state. Specifically, high-speed air introduced from the bottom air distribution device fluidizes the fuel particles, making the fuel bed resemble a fluid. Simultaneously, secondary air is introduced at a certain height in the furnace to ensure complete combustion. The high-temperature flue gas generated during combustion carries a large number of solid particles out of the furnace.

[0003] The bed material in a circulating fluidized bed boiler refers to the solid particulate material in a fluidized state within the boiler furnace. The bed material is a key factor in achieving fluidized combustion of fuel. In a circulating fluidized bed boiler, primary air enters the furnace from the bottom, causing the bed material to fluidize, flowing like a liquid. Fuel particles are thoroughly mixed in the fluidized bed material and have good contact with air, thus ensuring a smooth combustion reaction. This fluidized state facilitates rapid ignition and stable combustion of the fuel, avoiding localized overheating and incomplete combustion.

[0004] Considering that the normal operation of existing circulating fluidized bed boilers depends on a good fluidization state, the particle size distribution of the bed material has a significant impact on the fluidization quality. If the particle size difference of the bed material is too large, during the fluidization process, smaller particles are easily carried by the airflow to components such as cyclone separators, while larger particles may be difficult to fluidize, resulting in uneven local fluidization, which in turn reduces the performance and efficiency of the circulating fluidized bed boiler. Utility Model Content

[0005] The purpose of this utility model is to provide a circulating fluidized bed boiler with a bed material screening structure.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A circulating fluidized bed boiler with a bed material screening structure is provided, including a boiler body, a screw conveyor, a feeding hopper, two collection mechanisms, and a screening mechanism. The screw conveyor is fixedly installed on the boiler body and is used to transport the bed material into the boiler body. The feeding hopper is connected to the screw conveyor through a conveying pipe. The screening mechanism is fixedly installed on the feeding hopper and is used to screen the bed material. Both collection mechanisms are fixedly installed on the feeding hopper and are used to collect the screened bed material.

[0008] Furthermore, the screening mechanism includes a movable plate, a first screen plate, a connecting rod, a second screen plate, and a hinge block. The hinge block is fixedly installed on the movable plate. The first screen plate is hinged to the hinge block. One end of the connecting rod is hinged to the first screen plate, and the other end of the connecting rod is hinged to the second screen plate. A limit groove is provided on the feeding hopper, and the first screen plate is slidably connected to the limit groove.

[0009] Furthermore, the screening mechanism also includes a slider and a guide block. The feeding hopper is provided with a guide groove and a sliding groove. The slider is fixedly installed on the moving plate and is slidably connected to the sliding groove. The guide block is fixedly installed on the screen plate and is slidably connected to the guide groove.

[0010] Furthermore, the screening mechanism also includes an electric telescopic rod, which is fixedly installed on the feeding hopper, and the output end of the electric telescopic rod is fixedly connected to the moving plate. The aperture of the second screen plate is larger than that of the first screen plate.

[0011] Furthermore, each collection mechanism includes a collection box, a support plate, and a mounting plate. The support plate and the mounting plate are fixedly installed on the feeding hopper, and the collection box can be installed and removed from the support plate and the mounting plate.

[0012] Furthermore, each collection mechanism also includes a fixing block and a wedge. The fixing block is fixedly installed on the collection box and is inserted into the mounting plate. The fixing block and the wedge are connected by a spring. The mounting plate has a slot, and the wedge can be slidably installed on the fixing block and engaged with the slot.

[0013] The beneficial effects of this utility model are as follows: This circulating fluidized bed boiler with a bed material screening structure can perform secondary screening of the bed material through the screening mechanism, thereby ensuring that the particle size of the bed material remains uniform and reaches the required size, thus improving the fluidization quality of the circulating fluidized bed boiler and improving the boiler's performance and efficiency. In addition, the collection mechanism can collect the unqualified bed material that has been screened out, and it is convenient to replace the collection box for subsequent processing or secondary processing, thereby further improving the boiler's performance. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments of this utility model will be briefly introduced below.

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 2 This is a schematic diagram of the main structure of the screening mechanism of this utility model;

[0017] Figure 3 This is a cross-sectional view of the feeding hopper of this utility model;

[0018] Figure 4 This is a schematic diagram of the main structure of the movable plate, screening plate one, and screening plate two of this utility model;

[0019] Figure 5 This is a schematic diagram of the disassembled structure of the collection mechanism of this utility model;

[0020] Figure 6 This is a schematic diagram of the main structure of the mounting plate and support plate of this utility model.

[0021] In the diagram: 1. Boiler body; 2. Screw conveyor; 3. Feeding hopper; 4. Conveying pipe; 5. Collection mechanism; 51. Collection box; 52. Support plate; 53. Mounting plate; 54. Fixing block; 55. Spring; 56. Wedge block; 57. Slot; 6. Screening mechanism; 61. Moving plate; 62. Screen plate one; 63. Connecting rod; 64. Screen plate two; 65. Hinge block; 66. Electric telescopic rod; 67. Guide groove; 68. Slide groove; 69. Sliding block; 610. Guide block; 611. Limiting groove. Detailed Implementation

[0022] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of this utility model, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0024] Reference Figure 1 and Figure 2 The diagram illustrates a circulating fluidized bed boiler with a bed material screening structure. It includes a boiler body 1, a screw conveyor 2, a feeding hopper 3, two collection mechanisms 5, and a screening mechanism 6. The screw conveyor 2 is fixedly installed on the boiler body 1 and is used to transport bed material into the boiler body 1. Through the screw conveyor 2, the screened qualified bed material can be uniformly transported into the boiler body 1. The feeding hopper 3 is connected to the screw conveyor 2 via a conveying pipe 4. The conveying pipe 4 transports the screened qualified bed material from the feeding hopper 3 to the screw conveyor 2. The screening mechanism 6 is fixedly installed on the feeding hopper 3 and is used to screen the bed material. Through the screening mechanism 6, the bed material can be screened a second time, thereby removing larger and smaller particles, thus improving the particle uniformity of the bed material. Both collection mechanisms 5 are fixedly installed on the feeding hopper 3 and are used to collect the screened bed material. Through the two collection mechanisms 5, the large and small particles of bed material that have been screened can be collected respectively.

[0025] Reference Figure 3 and Figure 4 The screening mechanism 6 includes a movable plate 61, a first screen plate 62, a connecting rod 63, a second screen plate 64, and a hinge block 65. The hinge block 65 is fixedly installed on the movable plate 61, which is inclined. Small particles of bed material screened by the first screen plate 62 will fall onto the movable plate 61 and then slide into the collection box 51. The first screen plate 62 is hinged to the hinge block 65, which can screen out small particles of bed material and retain bed material of appropriate particle size. One end of the connecting rod 63 is hinged to the first screen plate 62, and the other end of the connecting rod 63 is hinged to the second screen plate 64. The movement of the first screen plate 62 can drive the connecting rod 63 to move, and the movement of the connecting rod 63 can drive the second screen plate 64 to move. A limiting groove 611 is provided on the feeding hopper 3, which limits the first screen plate 62. The first screen plate 62 and the limiting groove 611 are slidably connected.

[0026] Reference Figure 3 and Figure 4 The screening mechanism 6 also includes a slider 69 and a guide block 610. The feeding hopper 3 is provided with a guide groove 67 and a sliding groove 68. The slider 69 is fixedly installed on the moving plate 61 and is slidably connected to the sliding groove 68. The sliding groove 68 is an inclined groove. The sliding effect of the slider 69 and the sliding groove 68 guides the moving plate 61. The guide block 610 is fixedly installed on the second screen plate 64 and is slidably connected to the guide groove 67. The sliding effect of the guide block 610 and the guide groove 67 guides the second screen plate 64.

[0027] Reference Figure 3 and Figure 4 The screening mechanism 6 also includes an electric telescopic rod 66, which is fixedly installed on the feeding hopper 3. By activating the electric telescopic rod 66, the moving plate 61 can be moved along the direction of the slide groove 68. The output end of the electric telescopic rod 66 is fixedly connected to the moving plate 61. Through the movement of the moving plate 61, the hinge block 65 causes the screen plate 1 62 to slide along the limiting groove 611. The aperture of the screen plate 2 64 is larger than that of the screen plate 1 62. The bed material is screened once through the screen plate 2 64, which can retain large particles of bed material on the screen plate 2 64. The bed material after the first screening is screened a second time through the screen plate 1 62, so that qualified bed material is retained on the screen plate 1 62. Subsequently, through the movement of the moving plate 61, the screen plate 1 62 and the screen plate 2 64 are tilted at the same time, so that large and small particles of bed material fall into the two collection boxes 51 respectively, while qualified bed material falls to the bottom of the feeding hopper 3.

[0028] Reference Figure 5 and Figure 6Each collection mechanism 5 includes a collection box 51, a support plate 52, and a mounting plate 53. The support plate 52 and mounting plate 53 are both fixedly installed on the feeding hopper 3, providing support and fixation for the installed collection box 51. The collection box 51 can be installed and removed from the support plate 52 and mounting plate 53. The collection box 51 collects unqualified bed material after screening. Each collection mechanism 5 also includes a fixing block 54 and a wedge block 56. The fixing block 54 is fixedly installed on the collection box 51 and is inserted into the mounting plate 53. The fixing block 54 and the wedge block 56 are connected by a spring 55. The elastic force of the wedge 56 ensures that it remains engaged with the slot 57 without external force, thereby limiting the collection box 51 and keeping it fixed. The mounting plate 53 has a slot 57, and the wedge 56 can be slidably mounted on the fixing block 54. The wedge 56 is engaged with the slot 57. Through the sliding effect of the wedge 56, the wedge 56 can engage or disengage with the slot 57.

[0029] This circulating fluidized bed boiler, equipped with a bed material screening structure, can perform secondary screening of the bed material through the screening mechanism, thereby ensuring that the particle size of the bed material remains uniform and reaches the required size, thus improving the fluidization quality of the circulating fluidized bed boiler and improving the boiler's performance and efficiency. In addition, the set collection mechanism can collect the unqualified bed material that has been screened, and facilitate the replacement of the collection box for subsequent processing or secondary processing, thereby further improving the boiler's performance.

[0030] It should be stated that the above-described specific embodiments are merely preferred embodiments of this utility model and the technical principles employed. Those skilled in the art should understand that various modifications, equivalent substitutions, and variations can be made to this utility model. However, such variations, as long as they do not depart from the spirit of this utility model, should be within the protection scope of this utility model. Furthermore, some terminology used in this application specification and claims is not limiting, but merely for ease of description.

Claims

1. A circulating fluidized bed boiler provided with a bed material screening structure, characterized in that, The utility model provides a boiler, including boiler body (1), screw conveyor (2), upper hopper (3), two collection mechanisms (5) and screening mechanism (6), screw conveyor (2) is fixedly installed on boiler body (1), and screw conveyor (2) is used for conveying bed material to boiler body (1), upper hopper (3) is connected with screw conveyor (2) through the conveying pipe (4), screening mechanism (6) is fixedly installed on upper hopper (3), and screening mechanism (6) is used for screening bed material, and two collection mechanisms (5) are all fixedly installed on upper hopper (3), and collection mechanism (5) is used for collecting the bed material after screening.

2. A circulating fluidized bed boiler provided with a bed material screening structure according to claim 1, characterized in that, The screening mechanism (6) includes a moving plate (61), a sieve plate one (62), a connecting rod (63), a sieve plate two (64) and a hinge block (65), the hinge block (65) is fixedly installed on the moving plate (61), the sieve plate one (62) is hinged with the hinge block (65), one end of the connecting rod (63) is hinged with the sieve plate one (62), the other end of the connecting rod (63) is hinged with the sieve plate two (64), and the upper hopper (3) is provided with a limiting groove (611), and the sieve plate one (62) is slidably connected with the limiting groove (611).

3. A circulating fluidized bed boiler provided with a bed material screening structure according to claim 2, characterized in that, The screening mechanism (6) further includes a sliding block (69) and a guide block (610), the upper hopper (3) is provided with a guide groove (67) and a sliding groove (68), the sliding block (69) is fixedly installed on the moving plate (61), and the sliding block (69) is slidably connected with the sliding groove (68), the guide block (610) is fixedly installed on the sieve plate two (64), and the guide block (610) is slidably connected with the guide groove (67).

4. A circulating fluidized bed boiler provided with a bed material screening structure according to claim 3, characterized in that, The screening mechanism (6) further includes an electric telescopic rod (66), the electric telescopic rod (66) is fixedly installed on the upper hopper (3), and the output end of the electric telescopic rod (66) is fixedly connected with the moving plate (61), and the aperture of the sieve plate two (64) is larger than the aperture of the sieve plate one (62).

5. A circulating fluidized bed boiler provided with a bed material screening structure according to claim 1, characterized in that, Each of the collection mechanisms (5) includes a collection box (51), a support plate (52) and a mounting plate (53), the support plate (52) and the mounting plate (53) are fixedly installed on the upper hopper (3), and the collection box (51) is detachably installed on the support plate (52) and the mounting plate (53).

6. A circulating fluidized bed boiler provided with a bed material screening structure according to claim 5, characterized in that, Each of the collection mechanisms (5) further includes a fixed block (54) and a wedge block (56), the fixed block (54) is fixedly installed on the collection box (51), the fixed block (54) is inserted with the mounting plate (53), the fixed block (54) and the wedge block (56) are connected through a spring (55), the mounting plate (53) is provided with a clamping groove (57), the wedge block (56) is slidably installed on the fixed block (54), and the wedge block (56) is clamped with the clamping groove (57).

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