Coal-fired boiler pulverized coal feeding amount linkage type adjusting device and pulverized coal feeding system

Abstract

The utility model relates to the technical field of pulverized coal feeding, in particular to a coal-fired boiler pulverized coal feeding amount linkage type adjusting device and a pulverized coal feeding system, which comprise a feeding joint for adjusting air pressure and a curved pipe for transporting pulverized coal gas, a pressure relief pipe for balancing air pressure, an exhaust pipe for exhausting waste gas, a conical head for increasing air pressure conveying and an upper air channel communicated with a curved pipe are arranged in the feeding connector, the curved pipe is connected to one end of the feeding connector, the conical head is connected to the other end of the feeding connector, and the pressure relief pipe is vertically arranged over the feeding connector. The upper air channel is arranged in the center of the pressure relief pipe and communicated with the curved pipe, and the exhaust pipe is installed on the side face of the pressure relief pipe and keeps horizontal with the feeding connector. The rated air pressure in the pipe is adjusted through the pressure relief pipe, meanwhile, pipeline damage is avoided, the rated value of the pressure relief pipe can be changed, the amount of pulverized coal in linkage gas can be adjusted in a targeted mode, and the blockage problem is solved through the upper air channel capable of being rapidly cleaned.

Description

Technical Field

[0001] The utility model relates to the technical field of coal powder feeding, in particular to a coal powder feeding amount linkage regulating device for a coal-fired boiler and a coal powder feeding system. Background Art

[0002] Pulverized coal is a boiler fuel and is generally transported pneumatically through pipelines. The pulverized coal in the pipeline is quickly pressed into the boiler through the pipeline's pressurization, which not only improves the combustion efficiency but also increases gas circulation, avoiding the problem of incomplete combustion. However, the air pressure in the traditional pneumatic pipeline will gradually decrease as the amount of pulverized coal decreases, and it is impossible to continuously input high pressure into the boiler. Therefore, a coal-fired boiler pulverized coal feeding amount linkage adjustment device and a pulverized coal feeding system are needed to meet the needs.

[0003] Chinese patent CN208025548U discloses a pulverized coal constant feeding device, comprising a pulverized coal bin, a storage bin is provided below the pulverized coal bin, a powder holding tray is provided below the storage bin, a rotating cylinder is provided inside the powder holding tray, the rotating cylinder is a hollow structure, a plurality of receiving barrels are provided above the powder holding tray, the outer wall of the receiving barrel is fixedly connected to a connecting shaft, one end of the connecting shaft passes through the outer wall of the rotating cylinder and is connected to a small motor shaft through a coupling, the small motor is connected to the inside of the rotating cylinder through a connecting frame, and a controller is provided on one side of the powder holding tray; by arranging the receiving barrel and the rotating cylinder, the pulverized coal can be continuously collected, by arranging the small motor and the connecting shaft, the receiving barrel can be rotated to facilitate adjustment of the direction of the barrel mouth of the receiving barrel, by arranging the powder holding tray and arranging the bottom of the powder holding tray as an inclined structure, the pulverized coal can be collected when the pulverized coal is rotated and switched, and the scheme effectively solves the problem that the pulverized coal cannot be continuously input into the boiler at high pressure by adding a pressurizing device in the pipeline so as to quickly increase the air pressure after the air pressure in the pipeline is reduced.

[0004] There are still several points for improvement in the above scheme: the pipeline area is constant and the bearing pressure per unit area is limited. Unilaterally increasing the gas pressure will lead to excessive pressure, which may easily damage the pipeline; coal powder is easy to accumulate, causing blockage in the pipeline after long-term use. Utility Model Content

[0005] In order to solve the problems of the prior art, the utility model provides a coal-fired boiler pulverized coal feed amount linkage regulating device, comprising a feeding joint for regulating air pressure and a curved pipe for transporting pulverized coal gas, the feeding joint is provided with a pressure relief pipe for balancing the air pressure, an exhaust pipe for discharging exhaust gas, a conical head for increasing air pressure delivery and an upper air duct connected to the curved pipe, the curved pipe is connected to one end of the feeding joint, the conical head is connected to the other end of the feeding joint, the pressure relief pipe is vertically arranged directly above the feeding joint, the upper air duct is arranged at the center of the pressure relief pipe and is connected to the curved pipe, and the exhaust pipe is installed on the side of the pressure relief pipe and maintained horizontally with the feeding joint.

[0006] Preferably, a spring, a threaded rod, a pressing plate and a cover are provided in the pressure relief pipe. The cover is installed at the pipe opening of the pressure relief pipe. The threaded rod passes through the cover and is connected to the upper surface of the pressing plate. The spring is arranged between the lower surface of the pressing plate and the pipe opening of the upper airway.

[0007] Preferably, a threaded hole is provided at the center of the cover, a threaded opening is provided at the pipe opening of the pressure relief pipe, and a knob is installed at the top of the threaded rod.

[0008] Preferably, a filter screen and a top cover are provided in the upper airway, the filter screen is provided at the center of the upper airway, and the top cover is installed at the pipe opening of the upper airway and connected to the pressure relief pipe.

[0009] A pulverized coal feeding system comprises a booster pump, a motor, a flange inlet and the aforementioned pulverized coal feeding amount linkage regulating device for a coal-fired boiler, wherein the booster pump is installed at one end of a curved pipe, the motor is coaxially connected to the booster pump and is located below the curved pipe, and the flange inlet is installed on one side of the pump surface of the booster pump.

[0010] Preferably, the booster pump is provided with a piston, a rotating shaft, an impeller and a turntable, the rotating shaft passes through the pump surface of the booster pump and is connected to the motor, the impeller and the turntable are concentrically mounted on the rotating shaft, and the piston is located above the turntable and connected to the turntable.

[0011] Preferably, the piston is provided with an air hole, a gasket and a positioning rod, the air hole is arranged at the center of the piston, the positioning rod is installed beside the air hole and is located on the upper surface of the piston, and the gasket is installed on the positioning rod and covers the air hole.

[0012] Preferably, a connecting rod, a push rod and a positioning shaft are provided on the turntable, the positioning shaft is rotatably installed on the turntable, the connecting rod is rotatably connected to the positioning shaft, one end of the push rod is rotatably connected to the connecting rod, and the other end of the push rod 742 is connected to the bottom of the piston.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. The utility model adjusts the rated air pressure in the pipe through a pressure relief pipe, while avoiding pipeline damage. Specifically, when the pulverized coal gas passes through the conical head on the feeding joint, the cross-sectional area of ​​the pipe is reduced, so the air pressure of the pulverized coal gas flowing per unit area of ​​the conical head increases and is discharged from the conical head. The internal air pressure of the feeding joint is balanced by changing the rated value of the pressure relief pipe, and the gas flow rate in the feeding joint is adjusted while avoiding pipeline damage caused by excessive pressure.

[0015] 2. The utility model can change the rated value of the pressure relief pipe so as to adjust the rated value of the pressure relief pipe according to the amount of pulverized coal in the linked gas. Specifically, when the pulverized coal content or concentration in the gas decreases, the gas pressure in the pipe and the rated value of the pressure relief valve are increased to ensure the safety of the pipeline. The amount of pulverized coal output per unit time will not decrease. The threaded rod rotates on the cover to squeeze the pressing plate and thus the spring. Since the pulverized coal gas must push open the spring at the upper airway to pass through the upper airway, the rated air pressure in the feeding joint is changed by adjusting the compression value of the spring.

[0016] 3. The utility model uses an upper airway that can be quickly cleaned to solve the blockage problem. Specifically, the threaded port is used to quickly open or close the pressure relief pipe. After opening the pipe mouth of the pressure relief pipe, the filter in the upper airway at the center of the pressure relief pipe is taken out and cleaned, so as to clean the upper airway in time and avoid a large amount of coal powder accumulating in the upper airway to cause blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a stereoscopic diagram of a linkage type regulating device for the pulverized coal feed amount of a coal-fired boiler.

[0018] Figure 2 The present invention is a stereoscopic diagram of a feeding joint in a linkage type regulating device for pulverized coal feeding amount of a coal-fired boiler.

[0019] Figure 3 The present invention is a cross-sectional view of a feed joint in a linkage type regulating device for pulverized coal feed amount of a coal-fired boiler.

[0020] Figure 4 The present invention is a three-dimensional diagram of a cover in a linkage-type regulating device for pulverized coal feeding amount of a coal-fired boiler.

[0021] Figure 5 It is a stereoscopic diagram of a booster pump in a pulverized coal feeding system.

[0022] Figure 6 A coal powder feeding system Figure 5 Enlarged view of the piston on top of the boost pump.

[0023] The numbers in the figure are: 1. Feed joint; 2. Pressure relief pipe; 21. Spring; 22. Threaded rod; 23. Pressing plate; 24. Cover; 241. Knob; 242. Threaded hole; 243. Threaded mouth; 3. Exhaust pipe; 4. Conical head; 5. Upper airway; 51. Filter; 52. Top cover; 6. Curved pipe; 7. Booster pump; 71. Piston; 711. Air hole; 712. Gasket; 713. Positioning rod; 72. Rotating shaft; 73. Impeller; 74. Turntable; 741. Connecting rod; 742. Push rod; 743. Positioning shaft; 8. Motor; 9. Flange inlet. DETAILED DESCRIPTION

[0024] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0025] See also Figure 1 to Figure 6 As shown, a coal-fired boiler pulverized coal feed amount linkage regulating device comprises a feeding joint 1 for regulating air pressure and a curved pipe 6 for transporting pulverized coal gas, wherein the feeding joint 1 is provided with a pressure relief pipe 2 for balancing air pressure, an exhaust pipe 3 for discharging exhaust gas, a conical head 4 for increasing air pressure delivery and an upper airway 5 connected to the curved pipe 6, the curved pipe 6 is connected to one end of the feeding joint 1, the conical head 4 is connected to the other end of the feeding joint 1, the pressure relief pipe 2 is vertically arranged directly above the feeding joint 1, the upper airway 5 is arranged at the center of the pressure relief pipe 2 and is connected to the curved pipe 6, and the exhaust pipe 3 is installed on the side of the pressure relief pipe 2 and is kept horizontal with the feeding joint 1.

[0026] The regulating device transports pulverized coal gas through the curved pipe 6. When the pulverized coal gas passes through the conical head 4 on the feeding joint 1, the cross-sectional area of ​​the pipe is reduced, so the air pressure of the pulverized coal gas flowing per unit area of ​​the conical head increases and is discharged from the conical head 4. The pulverized coal accumulates in the feeding joint 1, and the internal air pressure of the feeding joint 1 is balanced by changing the rated value of the pressure relief pipe 2. While adjusting the gas flow rate in the feeding joint 1, excessive pressure is avoided to prevent pipeline damage. The exhaust pipe 3 is used to discharge the air pressure exceeding the rated value out of the pressure relief pipe 2. At the same time, the upper airway 5 is used to block the pulverized coal to prevent a large amount of pulverized coal from leaking from the pressure relief pipe 2.

[0027] See also Figure 1~Figure 3 As shown, a spring 21, a threaded rod 22, a pressing plate 23 and a cover 24 are provided in the pressure relief pipe 2. The cover 24 is installed at the pipe opening of the pressure relief pipe 2. The threaded rod 22 passes through the cover 24 and is connected to the upper surface of the pressing plate 23. The spring 21 is arranged between the lower surface of the pressing plate 23 and the pipe opening of the upper airway 5.

[0028] The threaded rod 22 rotates on the cover 24 to squeeze the pressing plate 23 and thus the spring 21. Since the pulverized coal gas must push open the spring 21 at the pipe opening of the upper airway 5 to pass through the upper airway 5, the rated air pressure in the feeding joint 1 is changed by adjusting the compression value of the spring 21. When the air pressure is too high, the excess gas enters the pressure relief pipe 2 from the upper airway 5 and is then discharged from the exhaust pipe 3.

[0029] See also Figure 4 As shown, a threaded hole 242 is provided at the center of the cover 24 , a threaded opening 243 is provided at the pipe opening of the pressure relief pipe 2 , and a knob 241 is installed at the top of the threaded rod 22 .

[0030] The threaded hole 242 corresponds to the size of the threaded rod 22, ensuring that the length of the threaded rod 22 in the pressure relief pipe 2 can be adjusted by turning the knob 241, thereby determining the compression value of the spring 21. The threaded mouth 243 is used to quickly open or close the pressure relief pipe 2 so as to clean the upper airway 5 in time and avoid a large amount of coal powder accumulating in the upper airway 5 and causing blockage.

[0031] See also Figure 3 As shown, a filter screen 51 and a top cover 52 are provided in the upper airway 5 , the filter screen 51 is provided at the center of the upper airway 5 , and the top cover 52 is installed at the pipe opening of the upper airway 5 and connected to the pressure relief pipe 2 .

[0032] The filter screen 51 is used to block the coal powder, prevent a large amount of coal powder from overflowing from the upper air duct 5 and discharge excess air pressure. The top cover 52 is compressed by the spring 21 and closes the pipe opening of the upper air duct 5. When the air pressure in the feeding joint 1 is greater than the elastic force of the spring 21, the top cover 52 is lifted up and the air pressure is balanced by the pressure relief pipe 2. When the air pressure in the feeding joint 1 is less than the elastic force of the spring 21 again, the top cover 52 is closed.

[0033] See also Figure 1 to Figure 6 As shown, a pulverized coal feeding system includes a booster pump 7, a motor 8, a flange inlet 9 and a linkage type regulating device for pulverized coal feeding amount of a coal-fired boiler as described above. The booster pump 7 is installed at one end of a curved pipe 6, the motor 8 is coaxially connected to the booster pump 7 and is located below the curved pipe 6, and the flange inlet 9 is installed on one side of the pump surface of the booster pump 7.

[0034] The flange inlet 9 is used for transporting pulverized coal gas. The pulverized coal gas is pressurized and sent into the curved pipe 6 by the booster pump 7. The air pressure in the feeding joint 1 can be artificially and quickly increased by changing the speed of the motor 8, so that a large amount of pulverized coal gas can quickly enter the boiler for combustion.

[0035] See also Figure 5 As shown, the boost pump 7 is provided with a piston 71, a rotating shaft 72, an impeller 73 and a turntable 74. The rotating shaft 72 passes through the pump surface of the boost pump 7 and is connected to the motor 8. The impeller 73 and the turntable 74 are concentrically mounted on the rotating shaft 72. The piston 71 is located above the turntable 74 and is connected to the turntable 74.

[0036] The piston 71 moves up and down in the pump channel of the booster pump 7 to increase the air pressure. The rotating shaft 72 is connected to the motor 8. The rotating shaft 72 rotates the turntable 74 to supply force to the piston 71 and make the piston 71 reciprocate in the booster pump 7. The impeller 73 is used to initially pressurize the pulverized coal gas transmitted from the flange inlet 9 and send it into the pump channel of the booster pump 7.

[0037] See also Figure 5 and Figure 6As shown, the piston 71 is provided with an air hole 711, a gasket 712 and a positioning rod 713. The air hole 711 is arranged at the center of the piston 71, the positioning rod 713 is installed beside the air hole 711 and is located on the upper surface of the piston 71, and the gasket 712 is installed on the positioning rod 713 and covers the air hole 711.

[0038] In order to ensure that the air pressure in the curved pipe 6 can be increased when the piston 71 reciprocates, the air hole 711 is blocked by the gasket 712 on the positioning rod 713. When the piston 71 rises, the gasket 712 fits against the air hole 711 for pressurization. When the piston 71 falls, the gasket 712 separates from the air hole 711, and the booster pump 7 replenishes air pressure to the top of the piston 71.

[0039] See also Figure 5 As shown, a connecting rod 741, a push rod 742 and a positioning shaft 743 are provided on the turntable 74. The positioning shaft 743 is rotatably installed on the turntable 74. The connecting rod 741 is rotatably connected to the positioning shaft 743. One end of the push rod 742 is rotatably connected to the connecting rod 741, and the other end of the push rod 742 is connected to the bottom of the piston 71.

[0040] The connecting rod 741 is driven by the rotating disk 74 to push the push rod 742 back and forth. The push rod 742 is located at the top of the piston 71 and supplies force to the piston 71. At the same time, the push rod 742 is located on both sides of the air hole 711 on the piston 71 to avoid blocking the air hole 711.

[0041] The above embodiments only express one or several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the attached claims.

Claims

1. A pulverized coal feed rate linkage regulating device for a coal-fired boiler, comprising a feed joint (1) for regulating gas pressure and a curved pipe (6) for transporting pulverized coal gas; It is characterized in that The feed joint (1) is provided with a pressure relief pipe (2) for balancing air pressure, an exhaust pipe (3) for discharging exhaust gas, a conical head (4) for increasing air pressure delivery, and an upper airway (5) connected to a curved pipe (6). The curved pipe (6) is connected to one end of the feed joint (1), and the conical head (4) is connected to the other end of the feed joint (1). The pressure relief pipe (2) is vertically arranged directly above the feed joint (1), the upper airway (5) is arranged at the center of the pressure relief pipe (2) and is connected to the curved pipe (6), and the exhaust pipe (3) is installed on the side of the pressure relief pipe (2) and is kept horizontal with the feed joint (1).

2. A coal-fired boiler pulverized coal feeding amount linkage regulating device according to claim 1, characterized in that: A spring (21), a threaded rod (22), a pressing plate (23) and a cover (24) are provided in the pressure relief pipe (2); the cover (24) is installed at the pipe opening of the pressure relief pipe (2); the threaded rod (22) passes through the cover (24) and is connected to the upper surface of the pressing plate (23); and the spring (21) is provided between the lower surface of the pressing plate (23) and the pipe opening of the upper airway (5).

3. A coal-fired boiler pulverized coal feeding amount linkage regulating device according to claim 2, characterized in that: A threaded hole (242) is provided at the center of the cover (24), a threaded opening (243) is provided at the pipe opening of the pressure relief pipe (2), and a knob (241) is installed at the top of the threaded rod (22).

4. The device for adjusting the coal powder feeding amount of a coal-fired boiler according to claim 1, characterized in that: A filter screen (51) and a top cover (52) are provided in the upper airway (5); the filter screen (51) is provided at the center of the upper airway (5); and the top cover (52) is installed at the pipe opening of the upper airway (5) and is connected to the pressure relief pipe (2).

5. A pulverized coal feeding system, characterized in that: The invention comprises a booster pump (7), a motor (8), a flange inlet (9) and a pulverized coal feed amount linkage regulating device for a coal-fired boiler as claimed in any one of claims 1 to 4, wherein the booster pump (7) is mounted at one end of a curved pipe (6), the motor (8) is coaxially connected to the booster pump (7) and is located below the curved pipe (6), and the flange inlet (9) is mounted on a pump surface on one side of the booster pump (7).

6. A pulverized coal feeding system according to claim 5, characterized in that: The booster pump (7) is provided with a piston (71), a rotating shaft (72), an impeller (73) and a rotating disk (74); the rotating shaft (72) passes through the pump surface of the booster pump (7) and is connected to the motor (8); the impeller (73) and the rotating disk (74) are coaxially mounted on the rotating shaft (72); and the piston (71) is located above the rotating disk (74) and is connected to the rotating disk (74).

7. A pulverized coal feeding system according to claim 6, characterized in that: The piston (71) is provided with an air hole (711), a gasket (712) and a positioning rod (713); the air hole (711) is provided at the center of the piston (71); the positioning rod (713) is installed beside the air hole (711) and is located on the upper surface of the piston (71); the gasket (712) is installed on the positioning rod (713) and covers the air hole (711).

8. A pulverized coal feeding system according to claim 6, characterized in that: A connecting rod (741), a push rod (742) and a positioning shaft (743) are provided on the rotating disk (74); the positioning shaft (743) is rotatably mounted on the rotating disk (74); the connecting rod (741) is rotatably connected to the positioning shaft (743); one end of the push rod (742) is rotatably connected to the connecting rod (741); and the other end of the push rod (742) is connected to the bottom of the piston (71).

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