Coal dust separator with ring-shaped jointing device

Abstract

This utility model discloses a pulverized coal separator with an annular adjustment device, including an outer shell and an inner hopper, which form an annular channel. An upper baffle assembly and a lower baffle assembly with identical structures are installed within the annular channel. An upper annular adjustment mechanism and a lower annular adjustment mechanism with identical structures are installed outside the outer shell. The upper annular adjustment mechanism includes a linkage ring supported by a fixing member. Multiple linkage components are installed on the linkage ring. Each linkage component includes a radial connecting rod, a rocker arm, and a rocker arm connecting rod connected to each other. The radial connecting rod is fixedly installed on the linkage ring, and the rocker arm connecting rod is fixedly connected to the end of a support shaft extending from the outer shell. An electric controller is connected to the linkage ring, driving the linkage ring to swing circumferentially. This enables the synchronous opening and closing of multiple axial baffles, eliminating adjustment deviations of individual baffles, improving the stability against coal flow impact under large-angle operating conditions, effectively improving the pulverized coal separation performance of the separator baffles at large angles, and effectively expanding the adjustable range of pulverized coal fineness under ultra-low load conditions.

Description

Technical Field

[0001] This utility model belongs to the field of thermal power generation technology, specifically relating to a pulverized coal separator with a ring-shaped regulating device. Background Technology

[0002] Power plants are required to maintain stable combustion in burners at ultra-low loads during deep peak shaving. This necessitates appropriately reducing the fineness of pulverized coal to induce earlier ignition, especially for coals with high ash content and low volatile matter. Given the current complex and uncontrollable coal sources in thermal power plants, and the promotion of co-firing with coal slime or sludge to improve profitability, real-time adjustment of pulverized coal fineness is crucial for the safe and economical operation of boilers at low loads.

[0003] Most domestic units still use static baffle-type pulverized coal separators, which require manual adjustment of the axial baffle opening to adjust the pulverizer's processing capacity and pulverized coal fineness. Even with increased baffle angles under low-load stable combustion conditions, the separation performance still deteriorates, failing to achieve good adaptability and follow-up of the pulverizing system under low-load stable combustion. Existing dynamic separators mostly use dynamic rotors to separate pulverized coal, resulting in significantly higher product costs. If a static separator is converted into a dynamic separator, the baffle plate shape needs to be changed and guide plates need to be added. Although this can achieve real-time adjustment of pulverized coal fineness, the conversion cost is too high, and maintenance and cleaning are frequent and costly. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a pulverized coal separator with a ring-shaped adjustment device, which can solve the technical problem that the separation performance of the existing static separator is still poor under low load and stable combustion conditions, even if the angle of the separator baffle is increased.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A pulverized coal separator with an annular adjustment device includes a coaxially arranged outer shell and an inner hopper, with the inner hopper fitted inside the outer shell. Both the outer shell and the inner hopper have conical sidewalls. The top of the outer shell is provided with an outlet pipe, and the bottom of the outer shell is provided with an inlet pipe and a return pulverized coal pipe. The inner surface of the outer shell and the outer surface of the inner hopper form an annular channel. An upper baffle assembly and a lower baffle assembly are installed in the annular channel. An upper annular adjustment mechanism and a lower annular adjustment mechanism are installed outside the outer shell. The upper annular adjustment mechanism is connected to the upper baffle assembly, and the lower annular adjustment mechanism is connected to the lower baffle assembly. Each of the upper and lower annular adjustment mechanisms is connected to an electric controller. The upper baffle assembly and the lower baffle assembly have the same structure. The upper baffle assembly includes a plurality of axial baffles that are radially and equally spaced along the annular channel. A support shaft is fixedly installed on the axis of the axial baffle. One end of the support shaft is installed on the inner hopper, and the other end of the support shaft extends out of the outer shell. The upper ring-shaped adjustment mechanism and the lower ring-shaped adjustment mechanism have the same structure. The aforementioned upper ring linkage mechanism includes a linkage ring sleeved on the outer shell. The linkage ring and the outer shell are connected by multiple fasteners. The linkage ring includes an inner ring and an outer ring fixedly connected by a connecting plate. Multiple linkage components corresponding to the support shaft are installed at equal intervals on the circumferential outer wall of the outer ring. One end of the fastener is fixedly installed on the outer wall of the outer shell, and the other end of the fastener is provided with a guide rail that cooperates with the inner ring. The electric controller is connected to the outer ring. The inner ring cooperates with the guide rail and guides the linkage ring to swing circumferentially under the control of the electric controller. The linkage assembly includes a radial connecting rod, a rocker arm, and a rocker arm connecting rod that are connected to each other. One end of the radial connecting rod is fixedly installed on the outer wall of the outer ring, and the other end of the radial connecting rod is connected to the top of the rocker arm through a universal joint. The bottom end of the rocker arm is connected to one end of the rocker arm connecting rod through a universal joint, and the other end of the rocker arm connecting rod is fixedly connected to the other end of its corresponding support shaft.

[0006] This utility model also includes the following technical features: The electric controller includes an angular stroke actuator, an actuator rocker arm, a first drive shaft, a transmission rocker arm, a second drive shaft, and a guide rod. The angular stroke actuator is fixedly installed on the outer wall of the outer casing. The output end of the angular stroke actuator is fixedly connected to one end of the actuator rocker arm. The other end of the actuator rocker arm is hinged to one end of the transmission rocker arm via the first drive shaft. The other end of the transmission rocker arm is hinged to one end of the guide rod via the second drive shaft. The other end of the guide rod is fixedly installed on the circumferential outer wall of the outer ring.

[0007] It also includes multiple angle indicator components that correspond one-to-one with the support shaft. Each angle indicator component includes an angle indicator plate and an angle pointer. The angle indicator plate is fixedly installed on the outer wall of the outer shell. The angle indicator plate has a fan-shaped structure, and the center of the angle indicator plate is coaxial with its corresponding support shaft. One end of the angle pointer is fixedly connected to the other end of the corresponding support shaft through a flange. The angle between the angle pointer and the rocker arm connecting rod is 180°.

[0008] The central angle corresponding to the angle indicator sign is a right angle.

[0009] The two ends of the support shaft are respectively hinged to the outer shell and the inner hopper by pins.

[0010] The included angle between two adjacent radial links is 12~15°.

[0011] The number of fasteners is at least three.

[0012] Compared with the prior art, this utility model has the following technical effects: This pulverized coal separator, by installing corresponding annular adjustment mechanisms on the upper and lower baffle assemblies, can achieve synchronous opening and closing of multiple axial baffles, eliminating adjustment deviations of individual baffles and improving the stability against coal flow impact under large-angle operating conditions. The opening degree of the axial baffle of the upper baffle assembly is adjusted according to the different opening degrees of the axial baffles of the lower baffle assembly, effectively improving the pulverized coal separation performance of the separator baffles at large angles. The assembly relationship between the fixing parts and the linkage ring limits the axial displacement of the linkage ring, guiding the linkage ring to stably oscillate circumferentially, ensuring the stability of the annular adjustment mechanism, and effectively expanding the adjustable range of pulverized coal fineness under ultra-low loads, enabling a pulverized coal fineness R90 of 5% to 10%. The pulverized coal fineness can be remotely controlled and adjusted according to load changes via an electric controller, with a response speed of no more than 10 seconds, effectively ensuring the maximum stable output of pulverized coal per unit time by the pulverizing system. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the upper ring-shaped adjustment mechanism of this utility model.

[0015] Figure 3 This is a schematic diagram of the electric controller structure of this utility model.

[0016] Figure 4 This is a schematic diagram showing the connection relationship between the upper annular joint adjustment structure and the upper baffle assembly of this utility model.

[0017] The meanings of the labels in the diagram are as follows: 1. Outer shell, 2. Inner chamber, 3. Annular channel, 4. Upper baffle assembly, 5. Lower baffle assembly, 6. Upper annular adjustment mechanism, 7. Lower annular adjustment mechanism, 8. Electric controller, 9. Angle indicator assembly; 41. Axial baffle; 42. Support shaft; 61. Linkage ring; 62. Fixing component; 63. Linkage assembly; 64. Guide rail; 611. Outer ring; 612. Inner ring; 613. Connecting plate; 631. Connecting rod; 632. Rocker arm; 633. Rocker arm connecting rod; 81. Angular stroke actuator; 82. Actuator rocker arm; 83. First drive shaft; 84. Drive rocker arm; 85. Second drive shaft; 86. Guide rod. 91. Angle indicator; 92. Angle pointer.

[0018] The specific content of this utility model will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0019] Following the above technical solution, the following are specific embodiments of this utility model. It should be noted that this utility model is not limited to the following specific embodiments, and all equivalent modifications made based on the technical solution of this application fall within the protection scope of this utility model.

[0020] In this utility model, unless otherwise stated, directional terms such as "upper", "lower", "left", and "right" are generally defined based on the drawing in the corresponding figure; "inner" and "outer" refer to the inner and outer contours of the corresponding components; and "longitudinal", "transverse", and "vertical" refer to the directions marked in the figure.

[0021] Example: This embodiment provides a pulverized coal separator with a ring-type regulating device, such as... Figures 1 to 4 As shown, it includes an outer shell 1 and an inner hopper 2 arranged coaxially. The inner hopper 2 is fitted inside the outer shell 1. The side walls of both the outer shell 1 and the inner hopper 2 are conical structures. The top of the outer shell 1 is provided with an outlet pipe, and the bottom of the outer shell 1 is provided with an inlet pipe and a powder return pipe. The inner surface of the outer shell 1 and the outer surface of the inner hopper 2 form an annular channel 3. An upper baffle assembly 4 and a lower baffle assembly 5 are installed in the annular channel 3. An upper annular adjustment mechanism 6 and a lower annular adjustment mechanism 7 are installed outside the outer shell 1. The upper annular adjustment mechanism 6 is connected to the upper baffle assembly 4, and the lower annular adjustment mechanism 7 is connected to the lower baffle assembly 5. An electric controller 8 is connected to the upper annular adjustment mechanism 6 and the lower annular adjustment mechanism 7 respectively. The upper baffle assembly 4 and the lower baffle assembly 5 have the same structure. The upper baffle assembly 4 includes a plurality of axial baffles 41 that are radially and equally spaced along the annular channel 3. A support shaft 42 is fixedly installed on the axis of the axial baffle 41. One end of the support shaft 42 is installed on the inner hopper 2, and the other end of the support shaft 42 extends out of the outer shell 1. The upper ring-shaped joint adjustment mechanism 6 and the lower ring-shaped joint adjustment mechanism 7 have the same structure; The upper ring linkage mechanism 6 includes a linkage ring 61 sleeved on the outer shell 1. The linkage ring 61 is connected to the outer shell 1 by multiple fasteners 62. The linkage ring 61 includes an inner ring 612 and an outer ring 611 fixedly connected by a connecting plate 613. Multiple linkage components 63 corresponding to the support shaft 42 are installed at equal intervals on the circumferential outer wall of the outer ring 611. One end of the fastener 62 is fixedly installed on the outer wall of the outer shell 1. The other end of the fastener 62 is provided with a guide rail 64 that cooperates with the inner ring 612. The electric controller 8 is connected to the outer ring 611. The inner ring 612 cooperates with the guide rail 64 and guides the linkage ring 61 to swing circumferentially under the control of the electric controller 8. The linkage assembly 63 includes a radial connecting rod 631, a rocker arm 632, and a rocker arm connecting rod 633 that are connected to each other. One end of the radial connecting rod 631 is fixedly installed on the outer wall of the outer ring 611. The other end of the radial connecting rod 631 is connected to the top end of the rocker arm 632 through a universal joint. The bottom end of the rocker arm 632 is connected to one end of the rocker arm connecting rod 633 through a universal joint. The other end of the rocker arm connecting rod 633 is fixedly connected to the other end of its corresponding support shaft 42.

[0022] In this embodiment, the upper baffle assembly 4 and the lower baffle assembly 5 are paired with corresponding upper annular adjustment mechanisms 6 and lower annular adjustment mechanisms 7. The electric controller 8 is used to drive the linkage ring 61 to swing circumferentially around the axis of the outer shell 1, thereby driving the linkage assembly 63 connected to the linkage ring 61 to operate simultaneously and drive each support shaft 42 to rotate by the same angle. The support shaft 42 then drives the axial baffle 41 to flip its opening degree, so as to realize the synchronous opening and closing of multiple axial baffles 41 and eliminate the adjustment deviation of a single axial baffle 41. There are at least 3 fixing parts 62 to provide effective and stable support for the linkage ring 61. The assembly relationship between the fixing parts 62 and the linkage ring 61 not only prevents the linkage ring 61 from being displaced in the axial direction, but also plays a stable guiding role for the circumferential swing of the linkage ring 61, ensuring the stability of the annular adjustment mechanism during operation. In use, the opening degree of the upper baffle assembly 4 can be adjusted according to the different opening degrees of the lower baffle assembly 5, thereby effectively improving the coal powder separation performance of the axial baffle 41 at large angles.

[0023] As a preferred embodiment, the electric controller 8 includes an angular stroke actuator 81, an actuator rocker arm 82, a first drive shaft 83, a transmission rocker arm 84, a second drive shaft 85, and a guide rod 86. The angular stroke actuator 81 is fixedly installed on the outer wall of the housing 1. The output end of the angular stroke actuator 81 is fixedly connected to one end of the actuator rocker arm 82. The other end of the actuator rocker arm 82 is hinged to one end of the transmission rocker arm 84 through the first drive shaft 83. The other end of the transmission rocker arm 84 is hinged to one end of the guide rod 86 through the second drive shaft 85. The other end of the guide rod 86 is fixedly installed on the circumferential outer wall of the outer ring 611. The electric controller 8 drives the linkage ring 61 to convert the rotation angle of 0~90° provided by the output end of the angular stroke actuator 81 into the circumferential torque of the linkage ring 61. Multiple linkage components 63 on the linkage ring synchronously drive the corresponding support shaft 42 to rotate, ensuring that multiple axial baffles 41 open and close in a consistent manner, thereby improving the stability against coal flow impact under large angle working conditions.

[0024] As a preferred embodiment, this embodiment also includes multiple angle indicator components 9 corresponding one-to-one with the support shaft 42. The angle indicator component 9 includes an angle indicator plate 91 and an angle pointer 92. The angle indicator plate 91 is fixedly installed on the outer wall of the housing 1. The angle indicator plate 91 has a fan-shaped structure. The center of the angle indicator plate 91 is coaxially set with its corresponding support shaft 42. One end of the angle pointer 92 is fixedly connected to the other end of the corresponding support shaft 42 through a flange. The angle between the angle pointer 92 and the rocker arm connecting rod 633 is 180°. The angle of rotation of the rocker arm connecting rod 633 is the angle of rotation of the support shaft 42. The angle pointer 92 can reflect the rotation angle of the rocker arm connecting rod 633 in real time. The opening and closing angle of the axial baffle 41 can be observed intuitively, which is convenient for precise control of the opening degree of the axial baffle 41 by the electric controller 6.

[0025] Furthermore, the central angle corresponding to the angle indicator 91 is a right angle, and the angle marking of the angle indicator 91 is the same as the opening range of the axial baffle 41, which is 0~90°.

[0026] As a preferred embodiment, the two ends of the support shaft 42 are respectively hinged to the outer shell 1 and the inner hopper 2 by pins, which can ensure static fixed connection and also allow relative movement with the outer shell 1 and the inner hopper 2. The pins can be locked with cotter pins, which is reliable and easy to disassemble.

[0027] As a preferred embodiment, the included angle between two adjacent radial connecting rods 631 is 12~15°, and the included angle between adjacent support shafts 42 of the upper baffle assembly 4 and the lower baffle assembly 5 of the pulverized coal separator is generally 12~15°. This angle setting ensures that the number of linkage components 63 corresponds to the number of support shafts 42, and that each support shaft 42 corresponds to one linkage component 63.

[0028] In actual operation of this embodiment: During operation, this pulverized coal separator ensures that the electric controller 8 is interlocked with the DCS control system, guaranteeing stable connection between each linkage component 63 and its corresponding support shaft 42. When the boiler load is running stably at 50-70% (typical value 60%), isokinetic sampling is performed on all pulverized coal pipelines at the pulverizer outlet, simultaneously recording parameters such as pulverizer power consumption, air volume, and pressure difference. The fineness of the pulverized coal (R90 value) is tested to establish benchmark data. The axial baffle opening of the lower baffle assembly 5 is adjusted to 45~65° (preferably 55°) through its corresponding electric controller 8, and the change in pulverized coal fineness is observed. While maintaining the opening of the lower baffle assembly 5, the axial baffle opening of the upper baffle assembly 4 is gradually increased from 20° (each increase ≤5°) through the electric controller 8 of the upper baffle assembly 4 until the pulverized coal fineness R90 reaches the target range of 5%-10%, that is, 5%-10% of the pulverized coal particles are larger than 90 micrometers.

Claims

1. A pulverized coal separator with an annular regulating device, comprising a coaxially arranged outer shell (1) and an inner hopper (2), the inner hopper (2) being fitted inside the outer shell (1), the side walls of both the outer shell (1) and the inner hopper (2) being conical structures, the top of the outer shell (1) being provided with an outlet pipe, the bottom of the outer shell (1) being provided with an inlet pipe and a return pulverized coal pipe, the inner surface of the outer shell (1) and the outer surface of the inner hopper (2) forming an annular channel (3), characterized in that, The annular channel (3) is equipped with an upper baffle assembly (4) and a lower baffle assembly (5). The outer shell (1) is equipped with an upper annular adjustment mechanism (6) and a lower annular adjustment mechanism (7). The upper annular adjustment mechanism (6) is connected to the upper baffle assembly (4), and the lower annular adjustment mechanism (7) is connected to the lower baffle assembly (5). The upper annular adjustment mechanism (6) and the lower annular adjustment mechanism (7) are each connected to an electric controller (8). The upper baffle assembly (4) and the lower baffle assembly (5) have the same structure. The upper baffle assembly (4) includes a plurality of axial baffles (41) that are radially and equally spaced along the annular channel (3). A support shaft (42) is fixedly installed on the axis of the axial baffle (41). One end of the support shaft (42) is installed on the inner bucket (2), and the other end of the support shaft (42) extends out of the outer shell (1). The upper ring-shaped adjustment mechanism (6) and the lower ring-shaped adjustment mechanism (7) have the same structure; The upper ring linkage mechanism (6) includes a linkage ring (61) sleeved on the outer shell (1). The linkage ring (61) and the outer shell (1) are connected by multiple fasteners (62). The linkage ring (61) includes an inner ring (612) and an outer ring (611) fixedly connected by a connecting plate (613). Multiple linkage components (63) corresponding to the support shaft (42) are installed at equal intervals on the circumferential outer wall of the outer ring (611). One end of the fastener (62) is fixedly installed on the outer wall of the outer shell (1). The other end of the fastener (62) is provided with a guide rail (64) that cooperates with the inner ring (612). The electric controller (8) is connected to the outer ring (611). The inner ring (612) cooperates with the guide rail (64) and guides the linkage ring (61) to swing circumferentially under the control of the electric controller (8). The linkage assembly (63) includes a radial connecting rod (631), a rocker arm (632), and a rocker arm connecting rod (633) that are connected to each other. One end of the radial connecting rod (631) is fixedly installed on the outer wall of the outer ring (611). The other end of the radial connecting rod (631) is connected to the top of the rocker arm (632) through a universal joint. The bottom end of the rocker arm (632) is connected to one end of the rocker arm connecting rod (633) through a universal joint. The other end of the rocker arm connecting rod (633) is fixedly connected to the other end of its corresponding support shaft (42).

2. The pulverized coal separator with an annular regulating device as described in claim 1, characterized in that, The electric controller (8) includes an angular stroke actuator (81), an actuator rocker arm (82), a first drive shaft (83), a transmission rocker arm (84), a second drive shaft (85), and a guide rod (86). The angular stroke actuator (81) is fixedly installed on the outer wall of the outer casing (1). The output end of the angular stroke actuator (81) is fixedly connected to one end of the actuator rocker arm (82). The other end of the actuator rocker arm (82) is hinged to one end of the transmission rocker arm (84) through the first drive shaft (83). The other end of the transmission rocker arm (84) is hinged to one end of the guide rod (86) through the second drive shaft (85). The other end of the guide rod (86) is fixedly installed on the circumferential outer wall of the outer ring (611).

3. The pulverized coal separator with a ring-shaped regulating device as described in claim 1, characterized in that, It also includes multiple angle indicator components (9) that correspond one-to-one with the support shaft (42). The angle indicator component (9) includes an angle indicator plate (91) and an angle pointer (92). The angle indicator plate (91) is fixedly installed on the outer wall of the outer shell (1). The angle indicator plate (91) has a fan-shaped structure. The center of the angle indicator plate (91) is coaxially set with its corresponding support shaft (42). One end of the angle pointer (92) is fixedly connected to the other end of the corresponding support shaft (42) through a flange. The included angle between the angle pointer (92) and the rocker arm connecting rod (633) is 180°.

4. The pulverized coal separator with an annular regulating device as described in claim 3, characterized in that, The central angle corresponding to the angle indicator (91) is a right angle.

5. The pulverized coal separator with an annular regulating device as described in claim 1, characterized in that, The two ends of the support shaft (42) are respectively hinged to the outer shell (1) and the inner hopper (2) by pins.

6. The pulverized coal separator with a ring-shaped regulating device as described in claim 1, characterized in that, The included angle between two adjacent radial links (631) is 12~15°.

7. The pulverized coal separator with a ring-shaped regulating device as described in claim 1, characterized in that, The number of fasteners (62) is at least three.

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