CN212657702U

CN212657702U - Anti-blocking device for coal dropping pipe of fluidized bed boiler

Info

Publication number: CN212657702U
Application number: CN202020701007.7U
Authority: CN
Inventors: 赵明亮; 姜薇薇; 王忠言; 郭帅; 鲁绍博; 刘秀; 王宁; 韩季廷; 张雪; 聂路远; 金英爱; 刘研
Original assignee: STATE GRID JILINSHENG ELECTRIC POWER SUPPLY Co ELECTRIC POWER RESEARCH INSTITUTE; Jilin University; State Grid Corp of China SGCC; Electric Power Research Institute of State Grid Jilin Electric Power Co Ltd
Current assignee: STATE GRID JILINSHENG ELECTRIC POWER SUPPLY Co ELECTRIC POWER RESEARCH INSTITUTE; Jilin University; State Grid Corp of China SGCC; Electric Power Research Institute of State Grid Jilin Electric Power Co Ltd
Priority date: 2020-04-30
Filing date: 2020-04-30
Publication date: 2021-03-05
Anticipated expiration: 2030-04-30

Abstract

The utility model provides a fluidized bed boiler coal breakage pipe prevents stifled device, include: the device comprises an air blowing box body, a cam mechanism and an air compressor; the coal feeding device comprises a coal dropping pipe, a gas blowing box body, a reducing spray pipe, a coal discharging pipe and a coal conveying pipe, wherein two ends of the gas blowing box body are hinged at the corners of the coal dropping pipe and the coal discharging pipe, the gas blowing box body is of a hollow structure, the bottom of the gas blowing box body is provided with an air inlet, the inside of the gas blowing box body is provided with the reducing spray pipe communicated with the outside, and raw coal at the corners; the cam mechanism is used for driving the air blowing box body to move in a reciprocating mode, and the blowing range of the air blowing box body is enlarged. The utility model discloses on the coal breakage inside pipe wall of the easy chute blockage that takes place, set up cam mechanism and the box of blowing, be provided with the convergent spray tube in the gas blow box, the air passes through air compressor and gets into this box of blowing, flows into the convergent spray tube again, after reducing air pressure increase speed, sweeps the raw coal, and the box reciprocating motion under cam mechanism's drive of should blowing simultaneously, so the raw coal can't stop in this department to reach and prevent stifled effect.

Description

Anti-blocking device for coal dropping pipe of fluidized bed boiler

Technical Field

The utility model relates to a fluidized bed boiler technical field especially involves a fluidized bed boiler coal breakage pipe anti-blocking device.

Background

Between the feeder and the mill, the transportation of the raw coal is usually accomplished by a coal drop pipe. Due to improper storage mode, the humidity of the raw coal is usually high, and when the water content of the raw coal is more than 10%, the fluidity of the raw coal is reduced, the viscosity is increased, and the raw coal is easy to hang on the wall of a coal dropping pipe when passing through the coal dropping pipe to form blockage. Once the coal blockage fault occurs, the coal blockage fault is difficult to dredge, and great potential safety hazard is generated on the whole unit. The traditional anti-blocking method has three types:

1. laying special materials on the inner side of the coal dropping pipe to reduce the friction coefficient of the inner surface, but the cost is too high, the replacement is difficult, and the flow cross section of the pipeline is reduced;

2. blowing through the blocked part by using an air cannon, but large-area blowing cannot be realized;

3. the vibrator is adopted to vibrate the blocked part, but the damage to the coal dropping pipe is large, and the effect on the coal with large viscosity is common.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a prevent device of circulating fluidized bed boiler coal breakage pipe jam sweeps and vibrates in coal breakage pipe and lower coal union coupling department, makes the raw coal be difficult for piling up in the bottom, gets into furnace smoothly, has effectively solved the problem that the aforesaid exists.

In order to achieve the above purpose, the utility model discloses do following design:

a fluidized bed boiler coal breakage pipe anti-blocking device comprises: the device comprises an air blowing box body, a cam mechanism and an air compressor; the coal feeding device comprises a coal dropping pipe, a gas blowing box body, a coal pushing pipe and a coal pushing pipe, wherein two ends of the gas blowing box body are hinged at corners of the coal dropping pipe and the coal dropping pipe; the tapered spray pipe comprises a large opening and a small opening with different diameters, compressed air generated by the air compressor flows into the air blowing box body from an air inlet, then flows through the large opening of the tapered spray pipe, and is sprayed out from the small opening of the tapered spray pipe after being subjected to pressure reduction and speed increase; the cam mechanism comprises a motor, a cam shaft and a fixed support, the motor and the fixed support are respectively fixed at the corners of the coal dropping pipe and the coal discharging pipe, and a main synchronous belt wheel is sleeved on an output shaft of the motor; the camshaft is arranged on the fixed support through a bearing; the cam shaft is respectively sleeved with a secondary synchronous belt wheel and at least one cam, and the secondary synchronous belt wheel and the primary synchronous belt wheel are in meshing transmission through a synchronous belt; when the motor drives the cam shaft to rotate forward and backward, the bulge of the cam pushes the bottom of the air blowing box body to generate two driving forces in opposite directions, and the air blowing box body is driven to do reciprocating motion.

Compared with the prior art, the beneficial effects of the utility model are that:

the cam mechanism and the blowing box body are arranged on the inner wall of the coal dropping pipe easy to cause coal blockage, the reducing nozzle is arranged in the blowing box body, air enters the blowing box body through the air compressor and then flows into the reducing nozzle, after the air pressure is reduced and the speed is increased, raw coal is blown and swept, and meanwhile the blowing box body does reciprocating motion under the driving of the cam mechanism, so that the raw coal cannot stay at the position, and the anti-blocking effect is achieved.

Drawings

The invention is further described with reference to the following drawings and detailed description:

FIG. 1 is a schematic view of the overall structure of an anti-blocking device for a coal dropping pipe of a fluidized bed boiler according to an embodiment of the present invention;

fig. 2 is a schematic view of an internal structure of the air blowing box provided by the embodiment of the present invention;

fig. 3 is a schematic structural diagram of a cam mechanism according to an embodiment of the present invention.

In the figure: 1-air blowing box body, 101-air inlet, 102-tapered spray pipe, 103-bottom, 2-cam mechanism, 201-motor, 2011-output shaft, 202-cam shaft, 203-main synchronous pulley, 204-auxiliary synchronous pulley, 205-cam, 206-synchronous belt, 3-air compressor, 4-coal dropping pipe, 5-coal dropping pipe and 6-valve.

The same reference numbers in all figures indicate similar or corresponding features or functions.

Detailed Description

In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.

In order to solve the problem that the corner of coal breakage pipe 4 and lower coal pipe 5 easily takes place the chute blockage, the utility model discloses set up one in this corner and prevent stifled device, carry out the reciprocal sweeping of circulation to this corner to prevent the problem emergence of chute blockage.

Fig. 1 shows the whole structure of the anti-blocking device for the coal dropping pipe of the fluidized bed boiler provided by the embodiment of the utility model.

As shown in figure 1, the utility model provides a fluidized bed boiler coal breakage pipe prevents stifled device, include: the blowing box body 1, the cam mechanism 2 and the air compressor 3, the air compressor 3 is used for conveying compressed air to the blowing box body 1, and the blowing box body 1 is used for blowing and sweeping the corners of the coal dropping pipe 4 and the coal dropping pipe 5 to blow off raw coal. The cam mechanism 2 is used for driving the air blowing box body 1 to move in a reciprocating mode, blowing of the air blowing box body 1 in a certain range is achieved, the blowing area is increased, and a better anti-blocking effect is achieved.

Fig. 2 shows the internal structure of the air blowing box provided by the embodiment of the present invention.

As shown in fig. 2, the air blowing box 1 is a hollow box, an air inlet 101 is opened at the bottom of the air blowing box 1, the air compressor 3 is communicated with the air inlet 101 at the bottom of the air blowing box 1 through a pipe, and a valve 6 is arranged on the pipe for controlling the flow rate.

Be provided with a plurality of convergent spray pipes 102 in the inside of box 1 of blowing, every convergent spray pipe 102 all has the different macrostoma and osculum of diameter, the osculum is compared to the macrostoma and is more close to air inlet 101, the macrostoma is located the below of osculum promptly, the high pressure compressed air more than 0.3MP that air compressor 3 produced gets into the box 1 of blowing from air inlet 101, after the macrostoma of convergent spray pipe 102 steps down the speed increase back from the osculum blowout of convergent spray pipe 102, blow to the raw coal, eliminate the jam, the knot arch of raw coal, the bridging problem.

Wide flow velocity c of the convergent nozzle 102₁Approximately 0, the state at the large port can be considered as a stagnation state of the constant entropy flow.

p^*＝p₁＝0.3MPa，T^*＝T₁＝298K，p_B＝0.1MPa，

Therefore, p₂＝p_cr＝0.528×p₁0.16MPa, it can be considered that the air reaches a critical state at the small opening of the tapered nozzle 102, at which time

In the formula, p^*Is stagnation pressure; p is a radical of₁，p₂The pressure at the small and large openings of the convergent nozzle 102; p is a radical of_crIs the critical pressure; p is a radical of_BIs a back pressure; ma is Mach number; c. C_fIs a small orifice flow rate.

Fig. 3 shows a structure of a cam mechanism provided in an embodiment of the present invention.

Fig. 3 is combined with fig. 1 to show that the cam mechanism includes a motor 201, a cam shaft 202 and a fixed support, the motor 201 and the fixed support are respectively fixed at the corners of the coal dropping pipe 4 and the coal dropping pipe 5, and a main synchronous pulley 203 is sleeved on an output shaft 2011 of the motor 201; the camshaft 202 is mounted on the fixed support through a bearing; a secondary synchronous pulley 204 and at least one cam 205 are respectively sleeved on the camshaft 202, and the secondary synchronous pulley 205 and the primary synchronous pulley 203 are in meshing transmission through a synchronous belt 206; when the motor 201 is used for driving the primary synchronous pulley 203 to rotate synchronously, the primary synchronous pulley 203 is used for driving the driven pulley 205 to rotate through the synchronous belt 206, the driven pulley 205 is used for driving the cam shaft 202 to rotate, the cam shaft 202 is used for driving the cam 205 to rotate, and when the cam 205 rotates to the protruding position and pushes the bottom 103 of the air blowing box body 1, a driving force is generated to drive the air blowing box body 1 to move.

When the motor 201 drives the cam shaft 202 to rotate in the forward and reverse directions, the blowing box 1 is driven to reciprocate.

In order to prevent the blowing box body 1 from falling off, two ends of the blowing box body 1 are hinged at the corners of the coal dropping pipe 4 and the coal dropping pipe 5.

The blowing box body 1 is driven to reciprocate within a certain range through the cam mechanism, the blowing range of the blowing box body 1 can be enlarged, and raw coal is effectively prevented from being accumulated at the corners of the coal dropping pipe 4 and the coal dropping pipe 5.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a fluidized bed boiler coal breakage pipe prevents stifled device which characterized in that includes: the device comprises an air blowing box body (1), a cam mechanism (2) and an air compressor (3); wherein the content of the first and second substances,

the coal feeding device is characterized in that two ends of the air blowing box body (1) are hinged to corners of the coal dropping pipe (4) and the coal dropping pipe (5), the air blowing box body (1) is of a hollow structure, an air inlet (101) is formed in the bottom of the air blowing box body (1), and a gradually-reduced spray pipe (102) communicated with the outside is arranged inside the air blowing box body (1);

the tapered spray pipe (102) comprises a large opening and a small opening with different diameters, compressed air generated by the air compressor (3) flows into the blowing box body (1) from the air inlet (101), then flows through the large opening of the tapered spray pipe (102) to be depressurized and accelerated, and then is sprayed out from the small opening of the tapered spray pipe (102);

the cam mechanism (2) comprises a motor (201), a cam shaft (202) and a fixed support, the motor (201) and the fixed support are respectively fixed at the corners of the coal dropping pipe (4) and the coal dropping pipe (5), and a main synchronous belt wheel (203) is sleeved on an output shaft of the motor (201); the camshaft (202) is mounted on the fixed support through a bearing; a secondary synchronous pulley (204) and at least one cam (205) are respectively sleeved on the camshaft (202), and the secondary synchronous pulley (204) is meshed with the primary synchronous pulley (203) through a synchronous belt (206) for transmission; when the motor (201) drives the cam shaft (202) to rotate positively and negatively, the bulge of the cam (205) pushes the bottom (103) of the air blowing box body (1) to generate two driving forces in opposite directions, and the air blowing box body (1) is driven to do reciprocating motion.