Adjustable pulverized coal distributor of fan coal mill

Abstract

The utility model relates to an adjustable pulverized coal distributor of a fan coal mill, which comprises an outer cylinder wall and an inner cylinder wall, a support frame is arranged at the bottom of the inner side of the outer cylinder wall, the inner cylinder wall is fixedly connected with the support frame, a plurality of fan blades are arranged between the outer cylinder wall and the inner cylinder wall, the fan blades are in shaft connection with the outer cylinder wall and the inner cylinder wall, and the fan blades are fixedly connected with the outer cylinder wall and the inner cylinder wall. An adjusting piece is arranged on the outer side of the outer cylinder wall and is connected with the fan blades; according to the utility model, the purpose of adjusting the angles of a plurality of fan blades at the same time can be achieved by controlling the ring rod.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of coal powder distributor, concretely is a fan mill adjustable type coal powder distributor. BACKGROUND

[0002] Under the current technical background, the fan mill is widely used in the grinding and conveying of coal in power plants. Although the traditional fixed type coal powder distributor is simple and reliable, it has limitations in adjusting the amount of coal powder entering different burners, cannot be flexibly adjusted according to actual needs, leads to low combustion efficiency and is difficult to adapt to load changes. In addition, due to the lack of precise control means, the coal powder distributor is prone to deviation during operation, affecting the overall performance of the boiler, and thus affecting the thermal efficiency and combustion effect. In order to improve the efficiency and stability of coal-fired power generation, it is inevitable to develop a device that can conveniently adjust the distribution of coal powder. SUMMARY

[0003] This section aims to outline some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the utility model name to avoid obscuring the purpose of this section, the abstract of the specification and the utility model name. Such simplifications or omissions cannot be used to limit the scope of the utility model.

[0004] In view of the following technical problems in the prior art: the traditional coal powder distributor is often difficult to realize fine and intelligent control, leading to low wind powder matching efficiency, affecting the combustion efficiency and stability of the boiler.

[0005] To solve the above technical problems, the utility model provides the following technical scheme: a fan mill adjustable type coal powder distributor, comprising,

[0006] The outer cylinder wall and the inner cylinder wall are fixedly connected with the support frame, and a plurality of fan blades are arranged between the outer cylinder wall and the inner cylinder wall, the fan blades are connected with the outer cylinder wall and the inner cylinder wall, and an adjusting member is arranged on the outer side of the outer cylinder wall and connected with the fan blades.

[0007] As a preferred technical scheme of the fan mill adjustable type coal powder distributor, one end of the fan blade is fixedly connected with a first rotating shaft, and the other end is fixedly connected with a second rotating shaft, a circular groove is arranged on the outer side of the inner cylinder wall, and the end of the first rotating shaft is embedded in the circular groove.

[0008] As a preferred technical scheme of the fan mill adjustable type coal powder distributor, a perforation is arranged on the outer cylinder wall, a fixed tube is arranged on the outer side of the perforation, and the second rotating shaft is arranged in the fixed tube.

[0009] As a kind of fan mill adjustable coal powder distributor, the outer cylinder wall outside is provided with clamping plate, the clamping plate is provided with roller, the roller outside is equipped with ring rod.

[0010] As a kind of fan mill adjustable coal powder distributor, the adjusting piece includes the connecting seat arranged on the outer cylinder wall outside, the connecting seat is provided with electric actuator, the electric actuator is connected with the ring rod by transmission part.

[0011] As a kind of fan mill adjustable coal powder distributor, the ring rod is connected with the second rotating shaft by linkage, the linkage includes the radial rod fixed on the ring rod outside, the first connecting rod fixedly connected with the second rotating shaft, the second connecting rod rotationally connected with radial rod and first connecting rod.

[0012] As a kind of fan mill adjustable coal powder distributor, the outer cylinder wall outside is further provided with limiting piece, the limiting piece includes constraint rod and telescopic rod, one end of the constraint rod is rotationally connected with the outer cylinder wall, the other end is rotationally connected with one end of telescopic rod, the other end of telescopic rod is rotationally connected with ring rod.

[0013] The beneficial effects of the present application are as follows: the present application can control the ring rod to adjust the angles of multiple fan blades simultaneously. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description, and obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor. Among them:

[0015] Figure 1 It is the overall cross-sectional structure schematic diagram of the present application;

[0016] Figure 2 It is the enlarged structure schematic diagram of B in the present application; Figure 1

[0017] Figure 3 It is the A view in the present application; Figure 1

[0018] ​​Reference numerals: 101, support frame; 300, fan blade; 200, inner cylinder wall; 301, first rotating shaft; 201, circular groove; 102, perforation; 103, fixed tube; 104, clamping plate; 105, roller; 400, adjusting component; 401, connecting seat; 402, electric actuator; 403, transmission component; 404, linkage component; 302, second rotating shaft; 404a, radial rod; 404b, first connecting rod; 404c, second connecting rod; 500, limiting component; 501, constraint rod; 100, outer cylinder wall; 502, telescopic rod; 106, ring rod. Detailed Implementation

[0019] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0020] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0021] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0022] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0023] Example 1

[0024] Reference Figures 1-3 This embodiment provides an adjustable pulverized coal distributor for a fan-driven coal mill, comprising an outer cylinder wall 100 and an inner cylinder wall 200. A support frame 101 is provided at the bottom inner side of the outer cylinder wall 100, and the inner cylinder wall 200 is fixedly connected to the support frame 101. A plurality of fan blades 300 are provided between the outer cylinder wall 100 and the inner cylinder wall 200, and the fan blades 300 are axially connected to the outer cylinder wall 100 and the inner cylinder wall 200. An adjustment component 400 is provided on the outer side of the outer cylinder wall 100 and connected to the fan blades 300.

[0025] Two support frames 101 are provided, which are used to fix the upper and lower ends of the inner cylinder wall 200 respectively; the adjusting component 400 is used to adjust the angle of multiple fan blades 300 simultaneously.

[0026] In this embodiment, the fan blades 300 are provided with 12 blades.

[0027] One end of the fan blade 300 is fixed with a first rotating shaft 301, and the other end is fixed with a second rotating shaft 302. A circular groove 201 is provided on the outer side of the inner cylinder wall 200, and the end of the first rotating shaft 301 is embedded in the circular groove 201.

[0028] The fan blades 300 are placed vertically and arranged radially along the device.

[0029] A perforation 102 is provided on the outer cylinder wall 100, and a fixing tube 103 is provided on the outside of the perforation 102. The second rotating shaft 302 passes through the fixing tube 103.

[0030] A bearing connection may be provided between the second rotating shaft 302 and the fixed tube 103 to keep the first rotating shaft 302 rotatable.

[0031] The fan blade 300 is a plate structure, and the first rotating shaft 301 is a round shaft structure. The end of the shaft that is connected to the fan blade 300 is provided with a groove. The fan blade 300 is embedded in the groove structure and fixed by bolts.

[0032] A clamping plate 104 is provided on the outer side of the outer cylinder wall 100, and a roller 105 is provided in the clamping plate 104. A ring rod 106 is sleeved on the outer side of the roller 105.

[0033] The roller 105 is connected to the clamping plate 104 by a pin. The roller 105 can rotate. The roller 105 is provided with an annular groove. The ring rod 106 is sleeved on the outside of the roller 105, so the ring rod 106 can make circular motion in place.

[0034] The adjusting component 400 includes a connecting seat 401 disposed on the outer side of the outer cylinder wall 100, and an electric actuator 402 disposed on the connecting seat 401. The electric actuator 402 is connected to the ring rod 106 through a transmission component 403.

[0035] Specifically, the transmission component 403 can be a connection structure of bevel gear and bevel gear disk. The electric actuator 402 is provided with a bevel gear, and the ring rod 106 is provided with a bevel gear disk. The bevel gear meshes with the bevel gear disk. When the bevel gear rotates, it drives the bevel gear disk to rotate, causing the ring rod 106 to rotate. Alternatively, a quasi-hypoid gear transmission method can be used for driving. Since the driving method of the electric actuator 402 to the ring rod 106 is existing technology, it will not be described in detail.

[0036] The ring rod 106 is inserted into the connecting seat 401.

[0037] Electric actuator 402 is specifically a rotary type, adopting an intelligent integrated product. The electric actuator's open / close direction limit switch should have two pairs of independent two normally open and two normally closed contacts, and the torque switch should have one pair of independent two normally open and two normally closed contacts; its contact capacity is 220VAC 5A; power: 0.75KW; voltage rating: 380V 50Hz; full stroke: 60s; protection rating: IP54; insulation class: F, but its temperature rise must not exceed the temperature rise value specified for Class B insulation; electrical equipment CE certification.

[0038] The ring rod 106 is connected to the second rotating shaft 302 via a linkage 404. The linkage 404 includes a radial rod 404a fixed to the outside of the ring rod 106, a first connecting rod 404b fixedly connected to the second rotating shaft 302, and a second connecting rod 404c rotatably connected to both the radial rod 404a and the first connecting rod 404b.

[0039] The first connecting rod 404b is perpendicular to the second rotating shaft 302, and can be fixed with bolts.

[0040] The radial rod 404a can be fixedly connected to the ring rod 106 by bolts and auxiliary fixing plate. One end of the first connecting rod 404b is also fastened to the second rotating shaft 302 by bolts.

[0041] A collar may be provided at one end of the second connecting rod 404c. The collar is sleeved on the radial rod 404a and the collar is limited so that the second connecting rod 404c can rotate relative to the radial rod 404a. Similarly, the other end of the first connecting rod 404b is pin connected to the second connecting rod 404c. Therefore, the first connecting rod 404b and the relatively rotating second connecting rod 404c can rotate together.

[0042] Based on this structure, when the ring rod 106 rotates, the radial rod 404a is driven to move, the second connecting rod 404c rotates relative to the first connecting rod 404b, and drives the second rotating shaft 302 to rotate, thus causing the fan blade 300 angle to deflect.

[0043] This achieves the goal of controlling the angle adjustment of multiple fan blades 300 simultaneously by rotating the drive ring rod 106.

[0044] A limiting member 500 is also provided on the outer side of the outer cylinder wall 100. The limiting member 500 includes a constraint rod 501 and a telescopic rod 502. One end of the constraint rod 501 is rotatably connected to the outer cylinder wall 100, and the other end is rotatably connected to one end of the telescopic rod 502. The other end of the telescopic rod 502 is rotatably connected to the ring rod 106.

[0045] The limiting component 500 is used to limit the rotation angle of the ring rod 106.

[0046] To allow the working angle of the adjustable blades to now be between 40° and 90°, an angle pointer is designed on the outer side of the second rotating shaft, which should be able to rotate between 30° and 90°.

[0047] Furthermore, by adjusting the regulating blades within the distributor, the amount of pulverized coal entering the upper two-stage burners is ensured to be 15% of the total coal quantity, while the amount entering the lower two-stage burners is 85%. The automatic adjustable blade pulverized coal distributor can regulate the distribution of air and pulverized coal during operation, achieving effective control over the air-coal distribution process. By adjusting the blade angle of the pulverized coal distributor, the height of the furnace flame center is changed, thereby increasing the means of regulating steam temperature under different loads. This alters the heat load distribution and prevents slagging. The distributor blade angle offers both manual and automatic adjustment modes for convenient operation and adjustment.

[0048] The pulverized coal distributor is made of steel plate with a material of at least 16Mn, which has high wear resistance. The regulating baffle is made of Q235-B with nickel-based tungsten carbide coating to improve its wear resistance. The coating thickness is not less than 1mm, and the service life is not less than 30 years under an average annual operating time of 5500 hours. Simultaneously, the blades are arranged in a flow-oriented manner to avoid direct and hard erosion of the blades by the pulverized coal airflow, thus reducing wear and extending service life. The root of the blade shaft, which is most susceptible to wear from the pulverized coal airflow, is treated with anti-wear material.

[0049] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0050] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An adjustable pulverized coal distributor for a fan-operated coal mill, characterized in that: include, The outer cylinder wall (100) and the inner cylinder wall (200) are provided. A support frame (101) is provided at the bottom of the inner side of the outer cylinder wall (100). The inner cylinder wall (200) is fixedly connected to the support frame (101). A plurality of fan blades (300) are provided between the outer cylinder wall (100) and the inner cylinder wall (200). The fan blades (300) are axially connected to the outer cylinder wall (100) and the inner cylinder wall (200). An adjusting component (400) is provided on the outer side of the outer cylinder wall (100) and connected to the fan blades (300).

2. The adjustable pulverized coal distributor for a fan mill according to claim 1, characterized in that: One end of the fan blade (300) is fixed with a first rotating shaft (301), and the other end is fixed with a second rotating shaft (302). A circular groove (201) is provided on the outer side of the inner cylinder wall (200), and the end of the first rotating shaft (301) is embedded in the circular groove (201).

3. The adjustable pulverized coal distributor for a fan mill according to claim 2, characterized in that: The outer cylinder wall (100) is provided with a perforation (102), and a fixing tube (103) is provided outside the perforation (102), and the second rotating shaft (302) passes through the fixing tube (103).

4. The adjustable pulverized coal distributor for a fan mill according to claim 2 or 3, characterized in that: A clamping plate (104) is provided on the outer side of the outer cylinder wall (100), and a roller (105) is provided in the clamping plate (104). A ring rod (106) is sleeved on the outer side of the roller (105).

5. The adjustable pulverized coal distributor for a fan mill according to claim 4, characterized in that: The adjusting component (400) includes a connecting seat (401) disposed on the outer side of the outer cylinder wall (100), and an electric actuator (402) is disposed on the connecting seat (401). The electric actuator (402) is connected to the ring rod (106) through a transmission component (403).

6. The adjustable pulverized coal distributor for a fan mill according to claim 5, characterized in that: The ring rod (106) is connected to the second rotating shaft (302) via a linkage (404). The linkage (404) includes a radial rod (404a) fixed to the outside of the ring rod (106), a first connecting rod (404b) fixedly connected to the second rotating shaft (302), and a second connecting rod (404c) rotatably connected to both the radial rod (404a) and the first connecting rod (404b).

7. The adjustable pulverized coal distributor for a fan-operated coal mill according to claim 6, characterized in that: A limiting member (500) is also provided on the outside of the outer cylinder wall (100). The limiting member (500) includes a constraint rod (501) and a telescopic rod (502). One end of the constraint rod (501) is rotatably connected to the outer cylinder wall (100), and the other end is rotatably connected to one end of the telescopic rod (502). The other end of the telescopic rod (502) is rotatably connected to the ring rod (106).

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