Deslagging device of circulating fluidized bed boiler

Abstract

The utility model discloses a slag discharging device of a circulating fluidized bed boiler, which comprises a slag bin body, a slag discharging port is arranged at the bottom of the slag bin body, and a connecting pipe is arranged at the slag discharging port. A rotating part is rotationally connected to the bottom of the connecting pipe, a plurality of dredging rods are arranged on the inner side of the rotating part, the tops of the dredging rods all extend to the slag discharging opening, and in the rotating process, the dredging rods are controlled through a second limiting assembly to loosen a slag block pile at the slag discharging opening, so that the anti-blocking effect is achieved; according to the utility model, the design structure is reasonable, the rotating part is mounted on the connecting pipe, the dredging rod is mounted on the rotating part, and slag blocks at the slag discharge port are loosened by the dredging rod under the control of the first limiting assembly and the second limiting assembly, so that the slag blocks fall down and are discharged under the stirring of the dredging rod and the action of gravity; the problems that in the prior art, a draught fan and a filter screen are used for guiding deslagging, losses are large, frequent cleaning and replacement are needed, and the service life is short are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of circulating fluidized bed, in particular to a slag discharging device for a circulating fluidized bed boiler. Background Technique

[0002] A circulating fluidized bed boiler is a boiler that adopts fluidized bed combustion technology and has a wide range of applications in multiple industrial fields; the circulating fluidized bed boiler needs to maintain a certain amount of waste slag as bed material, but the waste slag cannot be too much, so slag discharging treatment is required. Due to the increasingly complex fuel composition nowadays, the problem of blockage is more likely to occur.

[0003] In the Chinese utility model patent with the publication number of CN216716212U, a slag discharging port anti-blocking device for a circulating fluidized bed boiler is disclosed. By arranging a fan on one side of the slag discharging bin, the suction force provided by the fan is used for slag discharging, and the stirring block is used to stir the impurities in the slag discharging bin to play a role in anti-blocking. However, due to the suction force provided by the fan, in order to prevent dust from entering the fan, a filter screen is arranged in front of the fan for filtering. However, there is a lot of dust during the slag discharging process, and some small slag blocks are also easy to impact the filter screen under the action of the suction force, making the filter screen easily damaged seriously and affecting the service life of the slag discharging device. Content of the Utility Model

[0004] The purpose of the utility model is to make up for the deficiencies of the prior art and provide a slag discharging device for a circulating fluidized bed boiler.

[0005] To achieve the above purpose, the utility model provides the following technical scheme:

[0006] A slag discharging device for a circulating fluidized bed boiler includes a slag bin body. A slag discharging port is opened at the bottom of the slag bin body, and a connecting pipe is installed at the slag discharging port; the bottom of the connecting pipe is rotatably connected with a rotating part. The rotating part is a cylindrical structure with openings at the top and bottom. A plurality of third chutes distributed in an annular array are arranged on the inner wall of the rotating part. A plurality of dredging rods are also arranged inside the rotating part. Each dredging rod includes an operating part and a mounting part. The extending direction of the operating part is adapted to the extending direction of the rotating part. One end of the mounting part is connected to the operating part, and the other end of the mounting part penetrates through the corresponding third chute and extends to the outside of the rotating part; one ends of the plurality of dredging rods located outside the rotating part are respectively connected with a first limiting component and a second limiting component. The first limiting component is used to drive the rotating part and the plurality of dredging rods to rotate. The tops of the plurality of dredging rods all extend to the slag discharging port. The second limiting component is used to drive the plurality of dredging rods to move up and down or clamp towards the middle of the rotating part to loosen the slag block pile at the slag discharging port and play a role in anti-blocking.

[0007] Further, the dredging rod has a T-shaped structure. One end of the T-shaped structure penetrates through the third sliding groove, and a control rod is connected to this end of the T-shaped structure. The first limiting component is a first annular structure. The inner wall of the first limiting component is fixedly sleeved on the outside of the rotating part, and a driving component is arranged on one side of the first limiting component for driving the first limiting component to rotate. Among them, the bottoms of several control rods all penetrate through the first limiting component, so that the first limiting component drives the T-shaped structure and the rotating part to rotate through the control rods.

[0008] Further, the second limiting component includes an outer limiting frame installed on the outside of the connecting pipe. An inner limiting frame is connected to one side of the outer limiting frame. The inner sides of the inner limiting frame and the outer limiting frame are both second annular structures, and the second annular structure is sleeved on the outside of the rotating part. The bottom of the driving component is connected to the outer limiting frame. Among them, there is a gap between the inner side of the top of the outer limiting frame and the outer side of the top of the inner limiting frame to form a second sliding groove, and the shape of the second sliding groove is a multi-pointed star shape. The bottoms of several control rods respectively penetrate through the second sliding groove below, and the width of the second sliding groove matches the diameter of the control rod. First sliding grooves are opened at the connection positions of the first limiting component and several control rods, and each first sliding groove is slidably connected to a control rod respectively. The several first sliding grooves are distributed in an annular array around the outside of the rotating part, so that when the several control rods rotate, they slide along the track of the second sliding groove.

[0009] Further, a control ring with undulations is connected to the outer limiting frame. The control ring is located directly below the second sliding groove, and the bottoms of several control rods are slidably connected to the upper surface of the control ring. A shielding plate is sleeved on the outside of the T-shaped structure, and the shielding plate is located outside the rotating part. The side surface of the rotating part opposite to the upper surface of the shielding plate and the upper surface of the shielding plate are both magnetic surfaces, and the upper surface of the shielding plate repels the magnetic surface on the rotating part. The shielding plate is driven by the repulsive magnetic force to drive the bottom of the control rod to press against the upper surface of the control ring, so that the control rod moves up and down through the control ring.

[0010] A limiting component is arranged between the rotating part and the shielding plate. The limiting component is used to limit the horizontal movement of the shielding plate, so that the distance between the axis of the moving shielding plate and the rotating part remains the same.

[0011] Further, the inner side of the shielding plate is in contact with the outer side wall of the rotating part. The connection position of the shielding plate and the T-shaped structure is located in the middle of the shielding plate. The height of the shielding plate is twice the height of the third sliding groove, and the width of the shielding plate is greater than the width of the third sliding groove, so that during the movement, the shielding plate always covers the third sliding groove.

[0012] Further, the second chute includes several first inflection points and second inflection points. The several first inflection points and the several second inflection points are both distributed in an annular array around the rotating part, and the annular diameter of the distribution of the first inflection points is greater than the annular diameter of the distribution of the second inflection points. Each first inflection point is connected to two adjacent second inflection points on both sides through a communication channel; the up-and-down undulation points on the control ring respectively adapt to the first inflection points and the second inflection points of the second chute.

[0013] Further, the cross-sectional shape of the third chute is a right trapezoid, and the hypotenuse of the third chute is located below the T-shaped structure, and the bottom of the trapezoid of the third chute is located inside the rotating part.

[0014] Compared with the prior art, the slag discharging device of this circulating fluidized bed boiler has the following beneficial effects:

[0015] First, in the present utility model, a rotating part is installed on the connecting pipe, and a dredging rod is installed on the rotating part. Through the control of the first limiting component and the second limiting component, the dredging rod loosens the slag blocks at the slag discharging port, so that the slag blocks fall downward and are discharged under the agitation of the dredging rod and the action of gravity, solving the problems of large loss in guiding slag discharge through a fan and a filter screen in the prior art, frequent cleaning and replacement required, resulting in a short service life.

[0016] Second, in the present utility model, the dredging rod rotates continuously. During the rotation, the two groups of dredging rods squeeze each other inward, so that larger ones can be broken during the clamping process, avoiding blockage caused by larger slag blocks. At the same time, the dredging rod also jacks up and rotates upward to further control the slag discharging port, improving the effect of crushing and agitating the slag blocks. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0018] Figure 2 is a cross-sectional view of the rotating part of the present utility model;

[0019] Figure 3 is a three-dimensional structural schematic diagram of the first limiting component of the present utility model;

[0020] Figure 4 is a cross-sectional view of the first limiting component of the present utility model;

[0021] Figure 5 is an exploded schematic diagram of the present utility model;

[0022] Figure 6 is a cross-sectional view of the outer limiting frame of the present utility model.

[0023] In the figure: 1. Slag bin body; 2. Connecting pipe; 3. Rotating part; 4. Discharging part; 5. Control component; 6. Unclogging rod; 7. First limiting component; 8. Second limiting component; 801. Outer limiting frame; 802. Inner limiting frame; 803. Control ring; 9. Control rod; 10. Baffle plate. Detailed implementation manner

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] As Figure 1-6 shown, the present utility model provides a technical solution: a slag discharging device for a circulating fluidized bed boiler, including a slag bin body 1, a slag discharging port is opened at the bottom of the slag bin body 1, and a connecting pipe 2 is installed at the slag discharging port; the bottom of the connecting pipe 2 is rotatably connected to a rotating part 3, the rotating part 3 is a cylindrical structure with openings at both the top and the bottom, a plurality of third chutes are arranged in an annular array on the inner wall of the rotating part 3, and a plurality of unclogging rods 6 are further arranged inside the rotating part 3. The unclogging rod 6 includes an operating part and a mounting part. The extending direction of the operating part is adapted to the extending direction of the rotating part 3. One end of the mounting part is connected to the operating part, and the other end of the mounting part penetrates through the corresponding third chute and extends to the outside of the rotating part 3; one ends of the plurality of unclogging rods 6 located outside the rotating part 3 are respectively connected to a first limiting component 7 and a second limiting component 8. The first limiting component 7 is used to drive the rotating part 3 and the plurality of unclogging rods 6 to rotate. The tops of the plurality of unclogging rods 6 all extend to the slag discharging port. The second limiting component 8 is used to drive the plurality of unclogging rods 6 to move up and down or clamp towards the middle of the rotating part 3 to loosen the slag block pile at the slag discharging port and play a role in preventing blockage.

[0026] In use, the third chute communicates with the inner and outer sides of the rotating part 3 and has a right trapezoidal cross-section, with the bottom side located on the inner side wall of the rotating part 3 and the right-angled side located above, so as to facilitate the sliding of slag blocks through the hypotenuse and avoid slag block accumulation; the bottom of the rotating part 3 is rotatably connected to a discharging part 4, and the side surface of the discharging part 4 is connected to a second limiting component 8. At the same time, the top of the second limiting component 8 is connected to the connecting pipe 2 through a bracket for fixing the second limiting component 8 and keeping the discharging part 4 fixed, so that slag blocks enter at the top of the discharging part 4 and are discharged at the side or bottom outlet; a control component 5 is further arranged at the bottom of the second limiting component 8. The control component 5 includes an electric / hydraulic telescopic rod. The telescopic end of the telescopic rod is connected with a sealing gasket through a U-shaped connecting rod. The sealing gasket is slidably connected to the inner wall of the discharging part 4. When the sealing gasket moves upward to the top of the discharging part 4, the discharging part 4 is closed, thereby closing the slag discharge. At the same time, the upper part of the sealing gasket is an inclined surface, and the slope of the inclined surface is adapted to the slope of the side outlet of the discharging part 4, so that after the sealing gasket moves to a position adapted to the outlet below, the slag is discharged through the side outlet.

[0027] The dredging rod 6 has a T-shaped structure. One end of the T-shaped structure penetrates through the third chute, and a control rod 9 is connected to this end of the T-shaped structure; the first limiting component 7 is a first annular structure. The inner wall of the first limiting component 7 is fixedly sleeved on the outside of the rotating part 3, and a driving component is arranged on one side of the first limiting component 7 for driving the first limiting component 7 to rotate; among them, the bottoms of several control rods 9 all penetrate through the first limiting component 7, so that the first limiting component 7 drives the T-shaped structure and the rotating part 3 to rotate through the control rod 9.

[0028] In use, the number of T-shaped structures, control rods 9, and the third sliding grooves are adapted to each other. The number of T-shaped structures can be twelve, and their material can be selected as cemented carbide. The T-shaped structure includes a vertical rod and a telescopic cross rod. The vertical rod and the cross rod are fixedly connected. The vertical rod is a multi-prismatic body, and the edge of one of the prisms faces the axis side of the rotating part 3 to improve the extrusion effect. The width of the cross rod is adapted to the width of the third sliding groove. The driving component uses an electric motor. The first annular structure and the electric motor can be connected by gear transmission, belt transmission, and chain transmission. The electric motor drives the first annular structure to rotate, and then drives the control rod 9 to rotate. The control rod 9 further drives the T-shaped structure to rotate. The T-shaped structure drives the rotating part 3 to rotate through the third sliding groove at the same time. The T-shaped structure agitates the slag blocks in the connecting pipe 2 and at the outlet of the slag bin 1 to facilitate the fall of the slag blocks. At the same time, the cross rod and the control rod 9 can be connected by a telescopic push rod. The telescopic push rod is used to push the cross rod to move horizontally to adjust the initial position of the cross rod. At the same time, when not in use, the cross rod can be retracted to the side wall of the rotating part 3. It is also possible to open a number of corresponding threaded holes on the side of the cross rod close to the control rod 9. By aligning different threaded holes with the top of the control rod 9, and then threadedly connecting the screws with the threaded holes and the top of the control rod 9 to fix it. The initial positions of multiple T-shaped structures in the rotating part 3 are adjusted manually to facilitate the better rotation of the T-shaped structures to dredge the slag blocks and assist in slag discharge.

[0029] The second limiting component 8 includes an outer limiting frame 801 installed on the outside of the connecting pipe 2. One side of the outer limiting frame 801 is connected with an inner limiting frame 802. The inner sides of the inner limiting frame 802 and the outer limiting frame 801 are both second annular structures, and the second annular structure is sleeved on the outside of the rotating part 3. The bottom of the driving component is connected with the outer limiting frame 801. Among them, there is a gap between the inner side of the top of the outer limiting frame 801 and the outer side of the top of the inner limiting frame 802 to form a second sliding groove. The shape of the second sliding groove is a multi-pointed star shape. The bottom parts of several control rods 9 respectively penetrate the lower second sliding groove, and the width of the second sliding groove matches the diameter of the control rod 9. First sliding grooves are opened at the connection parts of the first limiting component 7 and several control rods 9, and each first sliding groove is slidably connected with a control rod 9 respectively. The several first sliding grooves are distributed in an annular array around the outside of the rotating part 3 so that several control rods 9 slide along the track of the second sliding groove during rotation.

[0030] In use, the outer limiting frame 801 includes a first circular ring at the bottom. The top of the first circular ring is fixedly connected to a second circular ring through a rectangular column, and is also fixedly connected to the rectangular column on the inner limiting frame 802. The top of the rectangular column is connected to a third circular ring, which matches the height of the second circular ring and has a certain gap therebetween to form a second chute. The movement of the control rod 9 is restricted by the second chute. When the first limiting component 7 rotates, the first limiting component 7 provides rotational power to the control rod 9. At the same time, the upper first chute cooperates with the second chute to prevent the control rod 9 from getting stuck, enabling the control rod 9 to slide reciprocally in the first chute and continuously move along the second chute. The control rod 9 provides a horizontal reciprocating motion for the T-shaped structure to achieve the extrusion of slag blocks and further improve the effect of auxiliary slag discharge.

[0031] An undulating control ring 803 is connected to the outer limiting frame 801. The control ring 803 is located directly below the second chute, and the bottoms of several control rods 9 are slidably connected to the upper surface of the control ring 803. A shielding plate 10 is sleeved outside the T-shaped structure. The shielding plate 10 is located outside the rotating part 3. The side surface of the rotating part 3 opposite to the upper surface of the shielding plate 10 and the upper surface of the shielding plate 10 are both magnetic surfaces, and the upper surface of the shielding plate 10 repels the magnetic surface on the rotating part 3. The repulsive magnetic force is used to push the shielding plate 10 to drive the bottom of the control rod 9 to press against the upper surface of the control ring 803, so that the control rod 9 moves up and down through the control ring 803. A limiting component is arranged between the rotating part 3 and the shielding plate 10 to limit the horizontal movement of the shielding plate 10, so that the distance between the axis of the moving shielding plate 10 and the rotating part 3 remains the same.

[0032] In use, the limiting component can adopt a circular rod. The top of the circular rod is fixedly connected to the magnetic surface of the rotating part 3, and the bottom penetrates through the shielding plate 10 to limit the horizontal movement of the shielding plate 10, enabling it to only move up and down. The shielding plate 10 is slidably connected to the cross bar of the T-shaped structure. Due to the magnetic force between the shielding plate 10 and the rotating part 3, the bottom of the control rod 9 always keeps pressing on the upper surface of the control ring 803. So that during the movement, the bottom of the control rod 9 moves along the upper surface of the control ring 803, thereby driving the up and down movement of the T-shaped structure, further improving the effect of auxiliary slag discharge and playing a role in preventing blockage. The undulating height of the control ring 803 is adapted to the height of the third chute to avoid mutual interference.

[0033] The inner side of the baffle 10 is in contact with the outer side wall of the rotating part 3; the connection part between the baffle 10 and the T-shaped structure is located in the middle of the baffle 10. The height of the baffle 10 is twice the height of the third chute, and the width of the baffle 10 is greater than the width of the third chute, so that during the movement, the baffle 10 always blocks the third chute; during use, the baffle 10 needs to move up and down while always keeping the third chute blocked, thereby preventing slag blocks from moving to the outside through the third chute, playing a role in sealing, dust prevention and leakage prevention.

[0034] The second chute includes a number of first inflection points and second inflection points. The number of first inflection points and the number of second inflection points are both distributed in an annular array around the rotating part 3, and the annular diameter of the distribution of the first inflection points is greater than the annular diameter of the distribution of the second inflection points. Each first inflection point is connected to the two adjacent second inflection points on both sides through a communication channel; the up-and-down undulating points on the control ring 803 are respectively adapted to the first inflection point and the second inflection point of the second chute; during use, the first inflection point and the second inflection point on the second chute, that is, point A and point B, are switched between a number of points A and B through the control rod 9, realizing movement in the second chute. At the same time, an extrusion process includes moving from the initial point A to point B, and then from point B to point A to complete an extrusion cycle. Through the distance between A and B, the frequency of controlling clamping can be realized. Six alternating annular distributions of A and B can be adopted; and the frequency of up-and-down undulation is controlled by the up-and-down undulating points, that is, point C and point D. Six alternating distributions of C and D are adopted, and point A is directly above point C, and point B is directly above point D, which are used for clamping and jacking at the same time to improve the effect of auxiliary slag discharge.

[0035] First, the motor drives the first limiting component 7 to rotate by thirty degrees, and then the first limiting component 7 drives the control rod 9 to rotate by thirty degrees. Since the control rod 9 penetrates the second chute, and at the same time, a first chute is provided between the first limiting component 7 and the control rod 9, the control rod 9 at point A in the second chute moves to point B, and at the same time, it moves from the side far from the circle to the side close to the center of the circle in the first chute, while the control rod 9 at point B in the second chute moves along the second chute to point A, and correspondingly moves from the side close to the center of the circle to the side far from the center of the circle in the first chute. At the same time, a control ring 803 with high and low undulations is provided at the bottom of the control rod 9, and a T-shaped structure is connected to the top of the control rod 9. At the same time, the T-shaped structure is connected to the baffle 10. The side surface of the rotating part 3 opposite to the upper surface of the lower baffle 10 and the upper surface of the baffle 10 are both magnetic surfaces, and the two repel each other, so that a downward thrust is provided to the baffle 10 through the magnetic force, so that the control rod 9 only presses on the upper surface of the control ring 803. During rotation, the upper side of the control rod 9 moves from point A to point B, and at the same time, the bottom of the control rod 9 moves from point C to point D. Similarly, for the bottom of the control rod 9 from point B to point A, it moves from point D to point C.

[0036] Then continue to rotate continuously, so that several control rods 9 rotate around the axis of the rotating part 3, and at the same time move along the second chute, causing the control rods 9 to reciprocate in the first chute, and at the same time the control rods 9 continuously move up and down reciprocally. Furthermore, for the T-shaped structure connecting the top of the control rod 9, when moving from A to B, the T-shaped structure moves towards the middle of the rotating part 3 while rotating, and at the same time jacks up. When moving towards the middle, larger particles can be squeezed and broken, and at the same time inserted upward into the slag block pile above. After moving downward, the slag block pile is loosened to facilitate falling downward. At the same time, for the T-shaped structure from point B to A, while rotating, it moves towards the inner wall of the rotating part 3, preparing to squeeze and break again, and at the same time pushing the slag block pile downward. Then it reciprocates like this to avoid slag discharge blockage.

Claims

1. A slag discharging device for a circulating fluidized bed boiler, comprising a slag bin body (1), a slag discharging port is formed at the bottom of the slag bin body (1), and a connecting pipe (2) is installed at the slag discharging port; characterized in that: A rotating part (3) is rotatably connected to the bottom of the connecting pipe (2). The rotating part (3) is a cylindrical structure with openings at both the top and the bottom. A plurality of third chutes are formed in the inner wall of the rotating part (3) and are distributed in an annular array. A plurality of dredging rods (6) are further arranged inside the rotating part (3). The dredging rod (6) comprises an operating part and a mounting part. The extending direction of the operating part is adapted to the extending direction of the rotating part (3). One end of the mounting part is connected to the operating part, and the other end of the mounting part penetrates through the corresponding third chute and extends to the outside of the rotating part (3); One end of each of the plurality of dredging rods (6) located outside the rotating part (3) is respectively connected to a first limiting component (7) and a second limiting component (8). The first limiting component (7) is used to drive the rotating part (3) and the plurality of dredging rods (6) to rotate. The tops of the plurality of dredging rods (6) all extend to the slag discharging port. The second limiting component (8) is used to drive the plurality of dredging rods (6) to move up and down or clamp towards the middle of the rotating part (3), so as to loosen the slag block pile at the slag discharging port and play a role in preventing blockage.

2. The slag discharge device of the circulating fluidized bed boiler according to claim 1, wherein: The dredging rod (6) is of a T-shaped structure. One end of the T-shaped structure penetrates through the third chute, and a control rod (9) is connected to this end of the T-shaped structure; The first limiting component (7) is a first annular structure. The inner wall of the first limiting component (7) is fixedly sleeved on the outside of the rotating part (3), and a driving component is arranged on one side of the first limiting component (7) for driving the first limiting component (7) to rotate; Wherein, the bottoms of the plurality of control rods (9) all penetrate through the first limiting component (7), so that the first limiting component (7) drives the T-shaped structure and the rotating part (3) to rotate through the control rod (9).

3. The slag discharge device of the circulating fluidized bed boiler according to claim 2, characterized in that: The second limiting component (8) comprises an outer limiting frame (801) installed on the outside of the connecting pipe (2). An inner limiting frame (802) is connected to one side of the outer limiting frame (801). The inner sides of the inner limiting frame (802) and the outer limiting frame (801) are both second annular structures, and the second annular structure is sleeved on the outside of the rotating part (3), and the bottom of the driving component is connected to the outer limiting frame (801); Wherein, there is a gap between the inner side of the top of the outer limiting frame (801) and the outer side of the top of the inner limiting frame (802) to form a second chute. The shape of the second chute is a multi-pointed star shape. The bottoms of the plurality of control rods (9) respectively penetrate through the lower second chute, and the width of the second chute matches the diameter of the control rod (9); A first chute is provided at the connection of the first limiting component (7) and each of the plurality of control rods (9), and each of the first chutes is slidably connected to one of the control rods (9). The plurality of first chutes are distributed in an annular array around the outer side of the rotating part (3), so that when the plurality of control rods (9) rotate, they slide along the track of the second chute.

4. The slag discharging device of the circulating fluidized bed boiler according to claim 3, characterized in that: A control ring (803) with undulations is connected to the outer limiting frame (801). The control ring (803) is located directly below the second chute, and the bottoms of the plurality of control rods (9) are slidably connected to the upper surface of the control ring (803); A shielding plate (10) is sleeved on the outer side of the T-shaped structure, and the shielding plate (10) is located on the outer side of the rotating part (3); One side surface of the rotating part (3) opposite to the upper surface of the shielding plate (10) and the upper surface of the shielding plate (10) are both magnetic surfaces, and the upper surface of the shielding plate (10) repels the magnetic surface on the rotating part (3). The repulsive magnetic force pushes the shielding plate (10) to drive the bottom of the control rod (9) to press the upper surface of the control ring (803), so that the control rod (9) moves up and down through the control ring (803); A limiting component is provided between the rotating part (3) and the shielding plate (10). The limiting component is used to limit the horizontal movement of the shielding plate (10), so that the distance between the axis of the moving shielding plate (10) and the rotating part (3) remains the same.

5. The slag discharging device of the circulating fluidized bed boiler according to claim 4, characterized in that: The inner side of the shielding plate (10) is in contact with the outer side wall of the rotating part (3); The connection between the shielding plate (10) and the T-shaped structure is located in the middle of the shielding plate (10). The height of the shielding plate (10) is twice the height of the third chute, and the width of the shielding plate (10) is greater than the width of the third chute, so that during movement, the shielding plate (10) always shields the third chute.

6. The slag discharging device of the circulating fluidized bed boiler according to claim 4, characterized in that: The second chute includes a plurality of first inflection points and second inflection points. The plurality of first inflection points and the plurality of second inflection points are both distributed in an annular array around the rotating part (3), and the annular diameter of the distribution of the first inflection points is greater than the annular diameter of the distribution of the second inflection points. Each of the first inflection points is connected to two adjacent second inflection points on both sides through a communication channel; The undulating points on the control ring (803) are respectively adapted to the first inflection point and the second inflection point of the second chute.

7. The slag discharging device of the circulating fluidized bed boiler according to claim 2, characterized in that: The cross-sectional shape of the third chute is a right trapezoid, and the hypotenuse of the third chute is located below the T-shaped structure, and the bottom side of the trapezoid of the third chute is located inside the rotating part (3).

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