Coal feeding device for circulating fluidized bed boiler

Abstract

The application discloses a coal feeding device for a circulating fluidized bed boiler, which comprises a coal hopper, a coal feeding pipe communicated with the coal hopper, a weighing mechanism communicated between the coal hopper and the coal feeding pipe, a pushing mechanism arranged in the coal feeding pipe, and a decoking device arranged at a discharging end of the coal feeding pipe. The pushing mechanism arranged in the coal feeding pipe and the decoking device arranged at the discharging end can not only remove the adhered residues on the pipe wall in a large area, but also ensure the smooth feeding of the coal into the pipe, and the structure is simple, compact and convenient to use.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of boiler production, in particular to a circulating fluidized bed boiler coal feeding device. BACKGROUND

[0002] Coking is a phenomenon that peat is carbonized and bonded by high-temperature baking due to sticking on the conveying pipeline. Because peat contains a large amount of soil and water, it has a great adhesion force on non-vertical pipelines. When it encounters high temperature, it is carbonized and bonded on the sticking part, and the pipeline at the clogging part is red-hot due to high temperature. The red-hot position continues to stick peat, and the accumulation and clogging phenomenon is more serious, which seriously affects the normal coal supply of the boiler, affects the power generation, and makes the boiler load drop instantaneously, which is a serious operation accident in the industry. SUMMARY

[0003] In view of the above problems of the prior art, the technical problem to be solved by the present application is to provide a circulating fluidized bed boiler coal feeding device which can quickly eliminate coal coke accumulation and ensure the smoothness of the coal feeding pipe.

[0004] To solve the above technical problems, one technical scheme adopted by the present application is to provide a circulating fluidized bed boiler coal feeding device, which comprises a coal hopper and a coal feeding pipe communicated with the coal hopper. A weighing mechanism is arranged in communication between the coal hopper and the coal feeding pipe. A pushing mechanism is further arranged in the coal feeding pipe. A coke removing device is further arranged at the discharge end of the coal feeding pipe. The coke removing device comprises a guide sleeve fixedly sleeved on the outer side of the coal feeding pipe and a rotating sleeve rotatably sleeved on the outer side of the guide sleeve. At least one ejector rod is inserted into the guide sleeve. Inserted slots are arranged on the inner side wall of the rotating sleeve corresponding to the positions of the ejector rods. The one end of each ejector rod is inserted into the inserted slot, and the inserted end of each ejector rod is provided with a guide column. The guide column corresponding to the position is inserted into the guide through slot. A through hole is arranged on the coal feeding pipe corresponding to the position of the ejector rod, and the other end of the ejector rod is inserted into the through hole.

[0005] A reciprocating motor is arranged on the support frame. The output end of the reciprocating motor is provided with a connecting rod. One end of the connecting rod is hingedly connected with one end of a transmission rod. The other end of the transmission rod is hingedly connected with a lug fixedly arranged on the rotating sleeve. The reciprocating motor is turned on, the transmission rod is driven to rotate by the connecting rod, and the rotating sleeve is synchronously driven to rotate by the hingedly connected lug. At the same time, the rotation of the rotating sleeve synchronously drives the rotation of the guide through slot. Similarly, the guide column inserted into the guide through slot is also synchronously driven to move, that is, the ejector rod connected with the guide column is synchronously driven to move. Since the ejector rod is inserted into the guide sleeve, the ejector rod is reciprocally moved on the guide sleeve and reciprocally inserted through the through hole, and is reciprocally moved on the wall of the coal feeding pipe.

[0006] With the above structure, the weighing mechanism is arranged to ensure the stability of the coal weight and avoid feeding blockage; the pushing mechanism is arranged to avoid the residual of the peat in the coal feeding pipe, reduce the accumulation and form the trend of rapid coal feeding; the coke removing device is arranged at the discharging end of the coal feeding pipe to crush the peat adhered to the adjacent high temperature position and then enter the combustion chamber with the subsequently pushed peat, which not only reduces the adhesion and accumulation, but also ensures the smoothness of the coal feeding pipe, and the structure is simple and the operation is convenient.

[0007] In order to simplify the structure and facilitate installation, as a preferred, the weighing mechanism comprises an electronic belt scale, a feeding port communicated with the discharging port of the coal hopper is arranged at one end of the electronic belt scale, a discharging pipe is arranged at the other end of the electronic belt scale, a drying pipe is communicated with the discharging pipe, and the discharging end of the drying pipe is communicated with the coal feeding pipe.

[0008] In order to quickly dry the surface of the peat and reduce the adhesion probability, as a preferred, the drying pipe is communicated with a first blowing pipe and a second blowing pipe communicated with the first blowing pipe, the gas outlet end of the second blowing pipe is communicated with the drying pipe, and a first adjusting valve is arranged on the second blowing pipe.

[0009] In order to simplify the installation structure, as a preferred, the pushing mechanism comprises a variable speed motor fixed on the coal feeding pipe and a shaftless spiral blade with one end connected with the output end of the variable speed motor, and the other end of the shaftless spiral blade extends into the coal feeding pipe; a support is arranged in the coal feeding pipe, a bushing is arranged on the support, the extending end of the shaftless spiral blade is fixedly connected with a connecting shaft, and the connecting shaft extends into the bushing.

[0010] In order to clean the residual peat on the inner wall of the coal feeding pipe, as a preferred, the outer diameter of the shaftless spiral blade is matched with the inner diameter of the coal feeding pipe.

[0011] In order to ensure the smooth movement of the ejector rod, as a preferred, a relief hole is arranged on the guide sleeve corresponding to the position of the ejector rod, an ejector rod sleeve is sleeved on the outer side of the ejector rod in each relief hole, a stepped hole is arranged in the ejector rod sleeve, a lubricating sleeve is arranged in the large hole end of the stepped hole, and the lubricating sleeve is attached to the outer side wall of the ejector rod.

[0012] In order to ensure the smooth rotation of the rotating sleeve and avoid interference and blockage, as a preferred, a cover plate is fixed on the rotating sleeve to shield the guide sleeve, a first groove is circumferentially arranged on the inner side wall of the cover plate, a second groove is arranged on the outer side wall of the guide sleeve corresponding to the position of the first groove, the first groove and the second groove form a cavity, and a ball is arranged in the cavity and attached to the cavity wall.

[0013] Beneficial effects: the present application sets pushing mechanism in the coal feeding pipe and sets the coke removing structure in the discharge end, which can not only remove the adhered residues on the pipe wall in a large area, but also ensure the smoothness of the coal feeding pipe, and the structure is simple, compact and convenient to use. BRIEF DESCRIPTION OF DRAWINGS

[0014] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application, the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application. In the drawings:

[0015] Figure 1 It is a structural schematic view of the present application.

[0016] Figure 2 It is an enlarged view of A in the figure. Figure 1

[0017] Figure 3 It is a structural schematic view of the coke removing device.

[0018] Figure 4 It is a structural sectional view of the rotating sleeve.

[0019] Figure 5 It is a schematic view of the arrangement of the guide through slot.

[0020] Figure 6 It is a schematic view of the installation structure of the guide sleeve and the coal feeding pipe.

[0021] Figure 7 It is a structural schematic view of the ejector rod sleeve.

[0022] Figure 8 It is a schematic view of the installation structure of the ejector rod and the guide column.

[0023] Figure 9 It is a use state view of the present application.

[0024] The meanings of the reference numerals in the drawings are as follows:

[0025] Coal hopper-1; electronic belt scale-2; discharge pipe-20; drying pipe-21; first blowing pipe-211; second blowing pipe-212; first regulating valve-213; second regulating valve-214; coal feeding pipe-3; variable speed motor-30; shaftless helical blade-31; support-32; connecting shaft-33; through hole-34;

[0026] Guide sleeve-4; rotating sleeve-40; lug-401; sealing plate-402; first recess-403; ejector rod-41; let-out hole-411; ejector rod sleeve-412; lubricating sleeve-413; insertion slot-42; guide column-43; guide through slot-44; second recess-45;

[0027] ​Reciprocating motor - 51; connecting rod - 52; transmission rod - 53; ball - 54. DETAILED DESCRIPTION

[0028] By Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , and Figure 9 As shown in the drawings, the present application comprises a coal hopper 1 and a coal feeding pipe 3 in communication with the coal hopper 1, a weighing mechanism is arranged in communication between the coal hopper 1 and the coal feeding pipe 3, a pushing mechanism is further arranged in the coal feeding pipe 3, and a decoking device is further arranged at the discharge end of the coal feeding pipe 3.

[0029] Specifically, the weighing mechanism comprises an electronic belt scale 2, a feeding port in communication with the discharge port of the coal hopper 1 is arranged at one end of the electronic belt scale 2, a discharge pipe 20 is arranged at the other end of the electronic belt scale 2, a drying pipe 21 is arranged in communication on the discharge pipe 20, the discharge end of the drying pipe 21 is arranged in communication with the coal feeding pipe 3; the drying pipe 21 is arranged in communication with a first air blowing pipe 211 and a second air blowing pipe 212 in communication with the first air blowing pipe 211, the gas outlet end of the second air blowing pipe 212 is arranged in communication with the drying pipe 21, and the first air blowing pipe 212 is provided with a first adjusting valve 213.

[0030] The pushing mechanism comprises a variable speed motor 30 fixedly arranged on the coal feeding pipe 3 and a shaftless spiral blade 31 connected at one end with the output end of the variable speed motor 30, the other end of the shaftless spiral blade 31 extends into the coal feeding pipe 3; a support 32 is arranged in the coal feeding pipe 3, a jack 32 is arranged on the support 32, the extending end of the shaftless spiral blade 31 is fixedly connected with a connecting shaft 33, the connecting shaft 33 extends into the jack, and the outer diameter size of the shaftless spiral blade 31 is matched with the inner diameter size of the coal feeding pipe 3.

[0031] The decoking device comprises a guide sleeve 4 fixedly sleeved on the outside of the coal feeding pipe 3 and a rotating sleeve 40 rotatably sleeved on the outside of the guide sleeve 4, at least one ejector rod 41 is inserted on the guide sleeve 4, and a jack 42 is arranged around the position corresponding to the ejector rod 41 on the inner side wall of the rotating sleeve 40, one end of each ejector rod 41 extends into the jack 42, and a guide column 43 is arranged at the extending end of each ejector rod 41, a guide slot 44 is arranged on the slot wall of the jack 42 at the position corresponding to the guide column 43, and the guide column 43 at the corresponding position extends into the guide slot 44; a through hole 34 is arranged on the coal feeding pipe 3 at the position corresponding to the ejector rod 41, the other end of the ejector rod 41 passes through the through hole 34 and extends into the coal feeding pipe 3.

[0032] Each guide sleeve 4 is provided with a clearance hole 411 at the position corresponding to the push rod 41. Each clearance hole 411 is provided with a push rod sleeve 412 that is sleeved on the outside of the push rod 41. Each push rod sleeve 412 is provided with a stepped hole. Each stepped hole has a lubricating sleeve 413 in the large hole end. The lubricating sleeve 413 fits snugly against the outer wall of the push rod 41.

[0033] A support frame 5 is fixed on the outside of the coal feeding pipe 3. A reciprocating motor 51 is provided on the support frame 5. A connecting rod 52 is provided at the output end of the reciprocating motor 51. One end of the connecting rod 52 is hinged to one end of the transmission rod 53. The other end of the transmission rod 53 is hinged to the lug 401 fixed on the rotating sleeve 40.

[0034] A sealing plate 402 that blocks the guide sleeve 4 is fixed on the rotating sleeve 40. A first groove 403 is arranged around the inner side wall of the sealing plate 402 in the circumferential direction. A second groove 45 is provided on the outer side wall of the guide sleeve 4 at the position corresponding to the first groove 403. The first groove 403 and the second groove 45 together form a cavity. A ball bearing 54 that fits the cavity wall is provided in the cavity.

[0035] The working principle of this invention is as follows:

[0036] like Figure 1 As shown, slurry is conveyed from the coal hopper 1 to the electronic belt scale 2. The electronic belt scale 2 ensures the stability of the coal feeding weight and avoids feed blockage. At the same time, a second regulating valve 214 is provided at the feed end of the drying pipe 21 to adjust the coal feeding amount according to the use of the combustion chamber.

[0037] The peat entering the drying pipe 21 contains moisture. Air is introduced and discharged through the first air pipe 211 to dry the peat. At the same time, in order to fully achieve the drying effect, the first regulating valve 213 needs to be opened so that the dry air is blown into the drying pipe 21 through the second air pipe 212 below the first air outlet pipe 211. The multi-directional blowing of dry air reduces the moisture on the surface of the peat and reduces the probability of the peat adhering in the coal feeding pipe 3.

[0038] like Figure 1 and Figure 2 As shown, next, the peat enters the coal feeding pipe 3 through the drying pipe 21. The variable speed motor 30 is started, which drives the shaftless spiral blade 31 to rotate. Since the outer diameter of the shaftless spiral blade 31 is matched with the inner diameter of the coal feeding pipe 3, the inner wall of the coal feeding pipe 3 is also scraped by the shaftless spiral blade 31 time and time again as the shaftless spiral blade 31 rotates. During the peat transportation process, the peat will not remain in the coal feeding pipe 3, which reduces the accumulation and forms a trend of rapid coal feeding.

[0039] like Figure 1 , Figures 3 to 9As shown, the peat then arrives at the discharge position via the feed pipe 3. At this position, to prevent the peat from sticking and accumulating due to high temperature, the reciprocating motor 51 needs to be turned on. The connecting rod 52 drives the transmission rod 53 to rotate, and the hinged support lug 401 simultaneously drives the rotating sleeve 40 to rotate. At the same time, the rotation of the rotating sleeve 40 synchronously drives the rotation of the guide groove 44. Similarly, it synchronously drives the guide post 43 extending into the guide groove 44 to move, that is, it synchronously drives the push rod 41 connected to the guide post 43 to move together. Since the push rod 41 is installed on the guide sleeve 4, it drives the push rod 41 to move back and forth on the guide sleeve 4 and reciprocate through the through hole 34, making a telescopic reciprocating movement on the pipe wall inside the feed pipe 3. This can break up the peat that is stuck to the high temperature position at the discharge end and allow it to enter the combustion chamber together with the peat that is pushed in from behind. This not only reduces adhesion and accumulation but also ensures the smooth flow of the feed pipe (e.g., Figure 9 The states shown in Figures a and b are as follows.

[0040] like Figure 3 , Figures 6 to 8 As shown, in order to ensure smooth movement of the push rod 41 under high temperature conditions, a clearance hole 411 is provided on the guide sleeve 4 at the position corresponding to the push rod 41. A push rod sleeve 412 is provided in each clearance hole 411 and sleeved on the outside of the push rod 41. A stepped hole is provided in the push rod sleeve 412. A lubricating sleeve 413 is provided in the large hole end of the stepped hole. The lubricating sleeve 413 fits snugly against the outer wall of the push rod 41.

[0041] Similarly, such as Figure 3 As shown, in order to make the rotation of the rotating sleeve 40 smooth, a sealing plate 402 that blocks the guide sleeve 4 is fixed on the rotating sleeve 40. A first groove 403 is provided along the circumferential direction on the inner side wall of the sealing plate 402. A second groove 45 is provided on the outer side wall of the guide sleeve 4 at the position corresponding to the first groove 403. The first groove 403 and the second groove 45 together form a cavity. A ball bearing 54 that fits against the cavity wall is provided in the cavity.

[0042] It should be noted that, as Figures 4 to 6 As shown, in this embodiment, six rows of slots 42 are evenly arranged axially inside the rotating sleeve 40. Each row of slots 42 has six guide grooves 44 evenly arranged circumferentially on its groove wall. That is, in this application, thirty-six push rods 41 are provided on the guide sleeve 4. This number is not unique and should be coordinated according to the applicable scope and the specifications of the push rods 41 to increase the total contact area of ​​the push rods 41 cross-section. This can effectively prevent coking on the wall of the coal feeding pipe 3.

Claims

1. A coal feeding device for a circulating fluidized bed boiler, characterized in that: The system includes a coal hopper (1) and a coal feeding pipe (3) connected to the coal hopper (1). A weighing mechanism is provided between the coal hopper (1) and the coal feeding pipe (3). A pushing mechanism is also provided inside the coal feeding pipe (3). A decoking device is also provided at the discharge end of the coal feeding pipe (3). The decoking device includes a guide sleeve (4) fixedly sleeved on the outside of the coal feeding pipe (3) and a rotating sleeve (40) rotatably sleeved on the outside of the guide sleeve (4). At least one push rod (41) is inserted into the guide sleeve (4). A corresponding push rod (41) is located on the inner wall of the rotating sleeve (40). Each position is provided with a slot (42), one end of each top rod (41) extends into the slot (42), and each top rod (41) is provided with a guide post (43) at the end of the extension. A guide groove (44) is provided on the groove wall of the slot (42) at the position corresponding to the guide post (43), and the guide post (43) at the corresponding position extends into the guide groove (44). A through hole (34) is provided on the coal feeding pipe (3) at the position corresponding to the top rod (41), and the other end of the top rod (41) passes through the through hole (34) and extends into the coal feeding pipe (3). A support frame is fixed on the outside of the coal feeding pipe (3), and a reciprocating motor (51) is mounted on the support frame. The output end of the reciprocating motor (51) is provided with a connecting rod (52). One end of the connecting rod (52) is hinged to one end of the transmission rod (53), and the other end of the transmission rod (53) is hinged to the lug (401) fixed on the rotating sleeve (40). When the reciprocating motor (51) is turned on, the connecting rod (52) drives the transmission rod (53) to rotate, and the hinged lug (401) drives the rotation synchronously. The sleeve (40) rotates; at the same time, the rotation of the rotating sleeve (40) synchronously drives the rotation of the guide groove (44), and similarly, it synchronously drives the guide column (43) extending into the guide groove (44) to move, that is, synchronously drives the top rod (41) connected to the guide column (43) to move together. Since the top rod (41) is installed on the guide sleeve (4), it drives the top rod (41) to move back and forth on the guide sleeve (4) and to pass through the through hole (34) repeatedly, making telescopic reciprocating movements on the pipe wall inside the coal feeding pipe (3).

2. The circulating fluidized bed boiler coal feeding device as described in claim 1, characterized in that: The weighing mechanism includes an electronic belt scale (2), with an inlet at one end of the electronic belt scale (2) connected to the outlet of the coal hopper (1), and an outlet pipe (20) at the other end of the electronic belt scale (2). A drying pipe (21) is connected to the outlet pipe (20), and the outlet end of the drying pipe (21) is connected to the coal feeding pipe (3).

3. The circulating fluidized bed boiler coal feeding device as described in claim 2, characterized in that: The drying tube (21) is also connected to a first air pipe (211) and a second air pipe (212) connected to the first air pipe (211). The air outlet of the second air pipe (212) is connected to the drying tube (21), and a first regulating valve (213) is provided on the second air pipe (212).

4. The coal feeding device for a circulating fluidized bed boiler as described in claim 1, characterized in that: The pushing mechanism includes a variable speed motor (30) fixed on the coal feeding pipe (3) and a shaftless spiral blade (31) with one end connected to the output end of the variable speed motor (30). The other end of the shaftless spiral blade (31) extends into the coal feeding pipe (3). A bracket (32) is provided in the coal feeding pipe (3). An insertion hole is provided on the bracket (32). A connecting shaft (33) is fixedly connected to the extended end of the shaftless spiral blade (31). The connecting shaft (33) extends into the insertion hole.

5. A coal feeding device for a circulating fluidized bed boiler as described in claim 4, characterized in that: The outer diameter of the shaftless helical blade (31) is matched with the inner diameter of the coal feed pipe (3).

6. The coal feeding device for a circulating fluidized bed boiler as described in claim 1, characterized in that: Each guide sleeve (4) is provided with a clearance hole (411) at the position corresponding to the top rod (41). Each clearance hole (411) is provided with a top rod sleeve (412) sleeved on the outside of the top rod (41). A stepped hole is provided in the top rod sleeve (412). A lubricating sleeve (413) is provided in the large hole end of the stepped hole. The lubricating sleeve (413) is fitted and sleeved on the outer wall of the top rod (41).

7. A coal feeding device for a circulating fluidized bed boiler as described in claim 1, characterized in that: A sealing plate (402) for blocking the guide sleeve (4) is fixed on the rotating sleeve (40). A first groove (403) is arranged around the inner side wall of the sealing plate (402) in the circumferential direction. A second groove (45) is provided on the outer side wall of the guide sleeve (4) at the position corresponding to the first groove (403). The first groove (403) and the second groove (45) together form a cavity. A ball bearing (54) that fits against the cavity wall is provided in the cavity.

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