Pressure relief device applied to pulverized coal conveying system

Abstract

The utility model discloses a pressure relief device applied to a pulverized coal conveying system, which comprises a pulverized coal bunker and a straight pipe connector, the bottom of the pulverized coal bunker is connected with a straight pipe, the other end of the straight pipe is connected with an injection tank, the surface of the straight pipe is connected with an upper bell valve and a lower bell valve through hoses, and the surface of the straight pipe is provided with a three-way connector. One end of the three-way joint is connected with a pressure relief pipeline, the other end of the pressure relief pipeline is communicated with the pulverized coal bunker, when the upper-middle valve and the lower-middle valve leak to cause the blockage of the pulverized coal in the straight pipe, the air pressure between the lower bell valve and the upper bell valve is suddenly increased, and the blocked pulverized coal in the injection tank or the straight pipe can be blown into the pulverized coal bunker through the pressure relief pipeline; therefore, the problems that the labor intensity of manual pipeline cleaning operation is reduced, the air pressure between the lower bell valve and the upper bell valve is suddenly increased, downward pressure is given to the injection tank, and the metering scale of the injection tank is inaccurate are solved, the situation can be avoided through the pressure relief pipeline, continuous production can be achieved, and therefore pulverized coal can be evenly, stably, continuously and safely fed to the reduction furnace.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal powder transportation, and in particular relates to a pressure relief device applied to a coal powder transportation system. Background Art

[0002] Since pulverized coal is generally transported to the blast furnace by a fully enclosed nitrogen charging device, in which the pulverized coal bin and the pulverized coal injection tank are composed of two butterfly valves, a soft connection and a hard connection, the internal situation of the system cannot be seen during production operation, and it is difficult to observe slight air leakage in the valves (upper bell valve and lower bell valve), which can easily cause unsmooth pulverized coal feeding, inaccurate metering of pulverized coal entering the blast furnace, and pressure buildup in the pulverized coal conveying system. Such undesirable phenomena seriously affect the thermal balance of the blast furnace. In order to solve this problem, the blast furnace coal injection system basically adopts regular shutdown for coal injection maintenance and artificial foam water leakage detection. The traditional shutdown treatment does not meet the requirements of the blast furnace (uniform, stable, continuous and safe coal delivery). This method has the disadvantages of low work efficiency, high labor intensity, affecting the stable and smooth operation of the blast furnace, and heat loss of the blast furnace, which seriously affects the cost reduction and efficiency improvement of the blast furnace and restricts the development of the blast furnace industry. Utility Model Content

[0003] The purpose of the utility model is to provide a pressure relief device applied to a pulverized coal conveying system, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a pressure relief device for a pulverized coal conveying system, comprising:

[0005] A pulverized coal bin, wherein a straight pipe is connected to the bottom of the pulverized coal bin, and the other end of the straight pipe is connected to the injection tank. One side of the injection tank is connected to the air supply system via a pipeline. An upper bell valve and a lower bell valve are connected to the surface of the straight pipe via a hose. A tee joint is provided on the surface of the straight pipe. One end of the tee joint is connected to a pressure relief pipe, and the other end of the pressure relief pipe is connected to the pulverized coal bin, so that the pressure relief pipe can blow the pulverized coal blocked in the injection tank or the straight pipe into the pulverized coal bin;

[0006] A straight pipe connector is detachably arranged on the surface of the pressure relief pipe and is used to clean the straight pipe between the upper bell valve and the spray tank.

[0007] Preferably, the pressure relief pipe is arranged at an angle of 45° upwards to the straight pipe.

[0008] Preferably, a sampling tube is provided on the surface of the straight tube and located between the upper bell valve and the lower bell valve, and one end of the sampling tube is hinged with a sealing cover via a hinge.

[0009] Preferably, a threaded cylinder is provided at the center of the top of the sealing cover, and a threaded rod is threadedly connected inside the threaded cylinder. One end of the threaded cylinder is rotatably connected to a sealing plate provided inside the sealing cover, and a sealing gasket is provided at the bottom of the sealing plate. The sealing plate is used to seal the sealing port inside the sampling tube.

[0010] Preferably, fixed ears are connected to one end of both the sampling tube and the sealing cover, and the fixed ears are fixedly connected by bolts.

[0011] Preferably, the straight pipe connector and the pressure relief pipe are connected by a flange.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] (1) The gas supply system provides a gas source, and the pulverized coal in the pulverized coal bin is transported into the straight pipe through the injection tank. The pressure relief pipe controls the air pressure between the lower bell valve and the upper bell valve. During the powder feeding period, the pressure relief pipe is in a closed state, and during the injection period, it is in an open state. If the upper and lower middle valves leak and cause the pulverized coal in the straight pipe to be blocked, the air pressure between the lower bell valve and the upper bell valve will increase sharply, which will cause the pressure of the injection tank to blow back upward along the straight pipe. Therefore, the blocked pulverized coal inside the injection tank or the straight pipe can be blown into the pulverized coal bin through the pressure relief pipe, thereby reducing the labor intensity of manual pipeline cleaning operations. And through the pressure relief pipe, it is avoided that when the upper and lower middle valves leak, the air pressure between the lower bell valve and the upper bell valve increases sharply, giving a downward pressure to the injection tank, resulting in inaccurate weighing of the injection tank scale. And this situation can be eliminated through the pressure relief pipe, and continuous production can be achieved, so that pulverized coal can be evenly, stably, continuously, and safely fed into the reduction furnace.

[0014] (2) Through the sampling holes on the surface of the straight pipe, the situation between the lower bell valve and the upper bell valve can be observed at any time, which is convenient for sampling and checking whether the powder feeding channel is abnormal. By screwing the bolts on the surfaces of the two groups of fixed ears to loosen the sealing cover and the sampling tube, and screwing the threaded rod to rotate inside the threaded cylinder, the sealing plate sealed inside the sealing port of the sampling tube is disengaged from the seal, and the sealing cover is flipped through the hinge, so that the sampling tube can be opened to sample the pulverized coal inside the straight pipe, which is convenient for detecting the quality of the freshly ground pulverized coal. Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of the present utility model;

[0016] Figure 2 is a schematic structural diagram of the sealing cover and the sampling tube of the present utility model.

[0017] In the figure: 1, pulverized coal bin; 2, straight pipe; 3, injection tank; 4, hose; 5, upper bell valve; 6, lower bell valve; 7, pressure relief pipeline; 8, straight pipe connector; 9, gas supply system; 10, sampling pipe; 11, hinge; 12, sealing cover; 13, threaded cylinder; 14, threaded rod; 15, sealing plate; 16, sealing port; 17, fixed ear; 18, bolt; 19, sealing gasket; 20, gas flow direction; 21, pulverized coal flow direction. Specific implementation mode

[0018] 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 in 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.

[0019] The present invention provides a pressure relief device applied to a pulverized coal conveying system as shown in Figure 1-2 the following, including:

[0020] A pulverized coal bin 1, the bottom of the pulverized coal bin 1 is connected with a straight pipe 2, and the other end of the straight pipe 2 is connected with an injection tank 3. One side of the injection tank 3 is connected with a gas supply system 9 through a pipeline. The surface of the straight pipe 2 is connected with an upper bell valve 5 and a lower bell valve 6 through a hose 4. A three-way joint is provided on the surface of the straight pipe 2, and one end of the three-way joint is connected with a pressure relief pipeline 7, and the other end of the pressure relief pipeline 7 is connected with the pulverized coal bin 1, so that the pressure relief pipeline 7 can blow the blocked pulverized coal 21 inside the injection tank 3 or the straight pipe 2 into the pulverized coal bin 1;

[0021] A straight pipe connector 8, the straight pipe connector 8 is detachably arranged on the surface of the pressure relief pipeline 7 and is used to clean the straight pipe 2 between the upper bell valve 5 and the injection tank 3.

[0022] The pressure relief pipeline 7 and the straight pipe 2 are arranged at an upward angle of 45°, which is convenient for the rising gas 20 to enter the pressure relief pipeline 7.

[0023] A sampling pipe 10 is provided on the surface of the straight pipe 2 and between the upper bell valve 5 and the lower bell valve 6. One end of the sampling pipe 10 is hinged with a sealing cover 12 through a hinge 11, and the sampling pipe 10 is sealed through the sealing cover 12 to prevent the sampling pipe 10 from leaking air.

[0024] A threaded cylinder 13 is provided at the center of the top of the sealing cover 12, and a threaded rod 14 is threadedly connected inside the threaded cylinder 13. One end of the threaded cylinder 13 is rotatably connected to a sealing plate 15 provided inside the sealing cover 12, and a sealing gasket 19 is provided at the bottom of the sealing plate 15. The sealing plate 15 is used to seal the sealing port 16 inside the sampling tube 10. Fixed ears 17 are connected to one end of each of the sampling tube 10 and the sealing cover 12, and the fixed ears 17 are fixedly connected by bolts 18. Rotate the threaded rod 14 to rotate inside the threaded cylinder 13, so that the sealing plate 15 sealed in the sealing port 16 of the sampling tube 10 is disengaged from the seal, and the sealing cover 12 is flipped through the hinge 11, so that the sampling tube 10 can be opened to sample the pulverized coal in the straight pipe 2, which is convenient for detecting the quality of the freshly ground pulverized coal.

[0025] The straight pipe connector 8 and the pressure relief pipeline 7 are connected by a flange. The straight pipe connector 8 is arranged on the pressure relief pipeline 7 with a length of 30 cm and is a detachable straight pipe connector 8, which is convenient for cleaning the pipeline between the upper bell valve 5 and the injection tank 3 from here when the straight pipe connector 8 is disassembled.

[0026] For the pressure relief device applied to the pulverized coal conveying system, the air supply system 9 provides the air source, and the pulverized coal in the pulverized coal bin 1 is conveyed into the straight pipe 2 through the injection tank 3. The injection systems are all vertically distributed. The flow of the pulverized coal depends on its own gravity and gas pressure, and the pressure relief pipeline 7 controls the air pressure between the lower bell valve 6 and the upper bell valve 5. During the powder feeding period, the pressure relief pipeline 7 is in the closed state and is in the open state during the injection period. If the upper and lower middle valves leak and cause the pulverized coal in the straight pipe 2 to be blocked, the air pressure between the lower bell valve 6 and the upper bell valve 5 will increase sharply, which will cause the pressure of the injection tank 3 to blow back upward along the straight pipe 2. Thus, the blocked pulverized coal inside the injection tank 3 or the straight pipe 2 can be blown into the pulverized coal bin 1 by the rising gas 20 in the pressure relief pipeline 7, thereby reducing the labor intensity of manual pipeline cleaning operations. By adjusting the pipeline pressure between the powder feeding and the injection tank 3 through the pressure relief pipeline 7, the weighing scale in the injection tank 3 can accurately record the amount of pulverized coal fed into the reduction furnace, effectively solving the problem of excessive pulverized coal injection caused by inaccurate metering, which in turn causes the reduction furnace to overheat and affect production;

[0027] And through the pressure relief pipeline 7, it is avoided that when the upper and lower middle valves leak, the air pressure between the lower bell valve 6 and the upper bell valve 5 increases sharply, giving a downward pressure to the injection tank 3, resulting in inaccurate weighing of the injection tank 3. This situation can be eliminated through the pressure relief pipeline 7, and continuous production can be achieved, so that pulverized coal can be evenly, stably, continuously and safely fed to the reduction furnace.

[0028] Through the sampling hole on the surface of the straight pipe 2, the situation between the lower bell valve 6 and the upper bell valve 5 can be observed at any time, which is convenient for sampling and checking whether the powder feeding channel is abnormal. By screwing the bolts 18 on the surface of the two groups of fixing ears 17, the sealing cover 12 and the sampling pipe 10 are loosened, and the threaded rod 14 is screwed to rotate within the threaded cylinder 13, so that the sealing plate 15 sealed within the sealing port 16 of the sampling pipe 10 is disengaged from the seal, and the sealing cover 12 is flipped through the hinge 11, thereby opening the sampling pipe 10 to sample the pulverized coal within the straight pipe 2, which is convenient for detecting the quality of freshly ground pulverized coal. After the detection, the sealing cover 12 can be flipped back to its original position and the threaded rod 14 is screwed to rotate within the threaded cylinder 13, so that the sealing plate 15 moves towards the position of the sealing port 16 and seals the sealing port 16. Then, the bolts 18 are screwed to fix the two groups of fixing ears 17, thereby completing the sealing of the sampling pipe 10 and preventing the sampling pipe 10 from leaking air.

[0029] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A pressure relief device applied to a pulverized coal conveying system, characterized in that Comprising: A pulverized coal bin (1), the bottom of the pulverized coal bin (1) is connected to a straight pipe (2), and the other end of the straight pipe (2) is connected to a blowing tank (3). One side of the blowing tank (3) is connected to a gas supply system (9) through a pipeline. The surface of the straight pipe (2) is connected to an upper bell valve (5) and a lower bell valve (6) through a flexible pipe (4). A tee joint is provided on the surface of the straight pipe (2). One end of the tee joint is connected to a pressure relief pipeline (7), and the other end of the pressure relief pipeline (7) is connected to the pulverized coal bin (1), so that the pressure relief pipeline (7) can blow the blocked pulverized coal (21) inside the blowing tank (3) or the straight pipe (2) into the pulverized coal bin (1); A straight pipe connector (8), the straight pipe connector (8) is detachably arranged on the surface of the pressure relief pipeline (7) and is used for cleaning the straight pipe (2) between the upper bell valve (5) and the blowing tank (3).

2. The pressure relief device applied to the pulverized coal conveying system according to claim 1, wherein: The pressure relief pipeline (7) is arranged at an upward angle of 45° with respect to the straight pipe (2).

3. The pressure relief device applied to the pulverized coal conveying system according to claim 1, characterized in that: A sampling pipe (10) is provided on the surface of the straight pipe (2) and between the upper bell valve (5) and the lower bell valve (6). One end of the sampling pipe (10) is hinged with a sealing cover (12) through a hinge (11).

4. The pressure relief device applied to the pulverized coal conveying system according to claim 3, wherein: A threaded cylinder (13) is provided at the center of the top of the sealing cover (12), and a threaded rod (14) is threadedly connected inside the threaded cylinder (13). One end of the threaded cylinder (13) is rotatably connected to a sealing plate (15) provided inside the sealing cover (12), and a sealing gasket (19) is provided at the bottom of the sealing plate (15). The sealing plate (15) is used for sealing the sealing port (16) inside the sampling pipe (10).

5. The pressure relief device applied to the pulverized coal conveying system according to claim 3, wherein: Both ends of the sampling pipe (10) and the sealing cover (12) are connected with fixing ears (17), and the fixing ears (17) are fixedly connected by bolts (18).

6. The pressure relief device applied to the pulverized coal conveying system according to claim 1, wherein: The straight pipe connector (8) and the pressure relief pipeline (7) are connected by a flange.

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