A pulverized coal silo for a hot blast stove

Abstract

This utility model relates to a pulverized coal silo for a hot blast stove, applying the field of pulverized coal silo technology. It solves the problem that explosion relief valves are easily damaged, requiring replacement before the pulverized coal silo can be reused, resulting in high maintenance costs. The silo includes a silo body, a dust collector, a pulverized coal feed pipe, an explosion-proof component, a baffle plate, and an inert gas conveying pipe. The explosion-proof component includes an explosion-proof port at the top of the silo body, an explosion-proof pipe connected at one end to the explosion-proof port, and an explosion-proof cover hinged to the explosion-proof port. The baffle plate is disposed inside the explosion-proof pipe and has several through holes. An on / off valve is installed on the inert gas conveying pipe. The silo provides explosion relief through the explosion-proof port, and after the explosion is relieved, the explosion-proof cover automatically closes inside the explosion-proof port, achieving reuse.

Description

Technical Field

[0001] This utility model is applied in the field of pulverized coal silo technology, and in particular relates to a pulverized coal silo for a hot blast stove. Background Technology

[0002] Coal powder silos are primarily used to store large quantities of coal powder, serving as a supply, transfer, and storage facility. In the metallurgical industry, there is a process and technology that uses hot blast stoves and dryers for material drying, typically employing coal powder as the combustion medium and heat source. The coal powder is fed into the hot blast stove via a coal powder silo, pneumatic conveying, and injection to obtain heat for the drying process. Because the storage and use of coal powder pose significant safety risks, including the potential for fire and explosion, safety is fundamental to the entire process control during coal powder storage and use.

[0003] The existing patent number "CN216159644U" discloses an automatic explosion-proof pulverized coal silo, including a pulverized coal silo body. Several explosion-proof holes are evenly installed on the top of the pulverized coal silo body, and an automatic explosion-proof valve is installed on the top of the pulverized coal silo body. The automatic explosion-proof valve includes a channel vertically set on the top of the pulverized coal silo body and a valve cover fastened to the upper end of the channel. The valve cover is hinged to the outer wall of the channel, and a rubber sealing ring is provided at the position where the valve cover fastens to the channel. The valve cover is obliquely fastened to the upper end of the channel, and the side of the valve cover with a higher horizontal position is fixedly connected to one end of a rotating part, while the other end of the rotating part is rotatably connected to a base on the outer wall of the channel.

[0004] The above description has the following problems: After the valve cover is opened by a large impact force, if the rotation angle is large, it is not easy for the valve cover to close back at the explosion-proof port after the explosion is released; secondly, because there is a sealing ring on the outer circle surface of the valve cover, it is not easy to fit tightly with the explosion-proof port when closing, due to the sealing ring, resulting in poor sealing and affecting the normal operation of the pulverized coal silo. Utility Model Content

[0005] The purpose of this utility model is to provide a pulverized coal silo for a hot blast stove, which solves the problems of the valve cover not being easy to close again at the explosion-proof opening after the explosion is vented, and the inadequate sealing affecting the normal operation of the pulverized coal silo.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] This utility model provides a pulverized coal silo for a hot blast stove, including a silo body, a dust collector and a pulverized coal feeding pipe at the top of the silo body, and further comprising:

[0008] An explosion-proof assembly includes an explosion-proof port located at the top of the powder hopper body, an explosion-proof pipe connected at one end to the explosion-proof port, and an explosion-proof cover hinged inside the explosion-proof port. The explosion-proof cover is provided with a reset element for automatic resetting.

[0009] A sealing element, the sealing element being used to seal the explosion-proof cover over the explosion-proof opening;

[0010] A baffle plate is disposed inside the explosion-proof pipe, and the baffle plate is provided with a plurality of through holes;

[0011] An inert gas conveying pipeline is provided for conveying inert gas into the powder silo body. The inert gas conveying pipeline is located at the bottom end of one side of the powder silo body and is equipped with an on / off valve.

[0012] Furthermore, the reset component is a compression spring, one end of which is connected to the inner side of the explosion-proof cover, and the other end of which is connected to the inner wall of the explosion-proof opening.

[0013] Furthermore, a sealing flange is provided along the circumference of the inner wall of the explosion-proof port, which fits against the inner side of the explosion-proof cover, and a sealing layer is provided on the upper end surface of the sealing flange.

[0014] Furthermore, a hinge is provided on the outer surface of the explosion-proof cover, and the other end of the hinge is installed on the top of the powder hopper body.

[0015] Furthermore, temperature detectors and pressure detectors are provided at the bottom, middle and top of the powder hopper body. The signal output terminals of the temperature detectors and pressure detectors are connected to the signal receiving terminals of the electrical control components. The signal receiving terminal of the on / off valve is connected to the signal output terminal of the electrical control components.

[0016] Furthermore, the top of the powder hopper body is provided with a dual gas detector for detecting oxygen and carbon monoxide concentrations, and the signal output terminal of the dual gas detector is connected to the signal receiving terminal of the electrical control component.

[0017] Furthermore, at least two delivery pipes for filling the powder hopper body into the powder hopper body are also provided at the top of the body. Each delivery pipe is equipped with a control valve, and the signal receiving end of the control valve is connected to the signal receiving end of the electrical control component.

[0018] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0019] This utility model provides a pulverized coal silo for a hot blast stove, comprising a silo body, a dust collector and a pulverized coal feeding pipe at the top of the silo body, an explosion-proof assembly including an explosion-proof port at the top of the silo body, an explosion-proof pipe connected at one end to the explosion-proof port, and an explosion-proof cover hinged to the top of the silo body and covering the explosion-proof port; a sealing element for sealing the explosion-proof cover over the explosion-proof port; a baffle plate disposed inside the explosion-proof pipe, the baffle plate having several through holes; and an inert gas conveying pipe for conveying inert gas into the silo body, the inert gas conveying pipe being disposed at the bottom of one side of the silo body, and an on / off valve being disposed on the inert gas conveying pipe. By filling the powder hopper with nitrogen to replace the flammable and explosive gases inside, the gas is discharged through the dust filter, thus achieving the function of depressurization and cooling. In the event of an explosion, the greater pressure will push open the explosion-proof cover, which will then release the explosion through the explosion-proof port. After the explosion is released, the explosion-proof cover can be reset under the action of a compression spring and placed inside the explosion-proof port for reuse. Attached Figure Description

[0020] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0021] Figure 1 This is a schematic diagram of the overall structure in a preferred embodiment of the present invention;

[0022] Figure 2 This is a cross-sectional view of the overall structure in a preferred embodiment of the present invention;

[0023] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0024] The reference numerals in the attached figures are explained as follows:

[0025] 1. Powder silo body; 2. Dust collector; 3. Powder coal feed pipe; 4. Explosion-proof port; 5. Explosion-proof pipe; 6. Explosion-proof cover; 7. Sealing flange; 8. Baffle plate; 9. Inert gas conveying pipe; 10. Temperature detector; 11. Pressure detector; 12. Dual gas detector; 13. Conveying pipe; 14. Control valve; 15. On / off valve; 16. Compression spring; 17. Hinge. Detailed Implementation

[0026] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0029] refer to Figure 1 , Figure 2 and Figure 3 This utility model provides a pulverized coal silo for a hot blast stove, comprising a silo body 1, with a dust collector 2 and a pulverized coal feed pipe 3 installed at the top of the silo body 1. During operation, pulverized coal is fed into the silo body 1 through the pulverized coal feed pipe 3. Upon entering the silo, the pulverized coal impacts and splashes a large amount of dust. The dust collector 2 removes this splashed dust and also helps stabilize the pressure within the silo body 1.

[0030] refer to Figure 1 , Figure 2 and Figure 3 It also includes explosion-proof components, seals 7, baffles 8, and inert gas delivery pipes 9. The explosion-proof components include an explosion-proof port 4 located at the top of the powder silo body 1, an explosion-proof pipe 5 connected at one end to the explosion-proof port 4, and an explosion-proof cover 6 hinged within the explosion-proof port 4. The explosion-proof cover 6 is equipped with a reset element 16 for automatic resetting; the reset element 16 is a compression spring, one end of which is connected to the inner surface of the explosion-proof cover 6, and the other end is connected to the inner wall of the explosion-proof port 4. In the event of an explosion, the explosion-proof cover 6 releases the explosion under the force of the impact, and after the explosion is released, the explosion-proof cover 6 resets under the action of the compression spring 16. No manual closing is required.

[0031] The inner wall of the explosion-proof opening 4 is provided with a sealing flange 7 along its circumference, which fits against the inner side of the explosion-proof cover 6. A sealing layer is provided on the upper end face of the sealing flange 7. When the explosion-proof cover 6 is placed inside the explosion-proof opening 4, the sealing flange 7 provides support for the explosion-proof cover 6. The explosion-proof cover 6 can achieve a sealing effect by pressing itself against the sealing layer. The sealing layer is made of high-temperature resistant rubber material.

[0032] refer to Figure 1 , Figure 2 and Figure 3 A baffle plate 8 is installed inside the explosion-proof pipe 5, and the baffle plate 8 has several through holes. The baffle plate 8 installed inside the explosion-proof pipe 5 serves to block the flow of solids (such as iron objects) from the coal powder in the event of an explosion. An inert gas conveying pipe 9 is used to convey inert gas into the coal powder silo body 1. The inert gas conveying pipe 9 is located at the bottom end of one side of the coal powder silo body 1, and an on / off valve 15 is installed on the inert gas conveying pipe 9.

[0033] refer to Figure 1 , Figure 2 and Figure 3 The inert gas conveying pipeline 9 is used to convey inert gas into the powder silo body 1. The inert gas is nitrogen. Nitrogen is introduced to replace the gas in the powder silo body 1, so as to avoid the risk of fire or explosion and play a preventive role.

[0034] refer to Figure 1 , Figure 2 and Figure 3 A hinge 17 is provided on the outer side of the explosion-proof cover 6. The other end of the hinge 17 is installed on the top of the powder hopper body 1. The hinge 17 can pull the explosion-proof cover 6 to prevent the explosion-proof cover 6 from being damaged and splashed, and from hitting the explosion-proof pipe 5 or the baffle plate 8.

[0035] refer to Figure 1 , Figure 2 and Figure 3 Temperature detectors 10 and pressure detectors 11 are installed at the bottom, middle, and top of the powder hopper body 1. The signal output terminals of the temperature detectors 10 and pressure detectors 11 are connected to the signal receiving terminals of the electrical control components. The signal receiving terminal of the on / off valve 15 is connected to the signal output terminal of the electrical control components. The temperature and pressure inside the powder hopper body 1 are detected by the temperature detectors 10 and pressure detectors 11 respectively. When any one of them is outside the set range, the signal is fed back to the electrical control components, which control the on / off valve 15 to deliver nitrogen into the powder hopper body 1.

[0036] refer to Figure 1 , Figure 2 and Figure 3The powder silo body 1 is equipped with a dual gas detector 12 at its top for detecting oxygen and carbon monoxide concentrations. The signal output terminal of the dual gas detector 12 is connected to the signal receiving terminal of the electrical control component. At least two inert gas delivery pipes 13 are also provided at the top of the powder silo body 1 for filling it with inert gas. Each delivery pipe 13 is equipped with a control valve 14, and the signal receiving terminal of the control valve 14 is connected to the signal receiving terminal of the electrical control component. The dual gas detector 12 detects oxygen and carbon monoxide levels within the powder silo body 1 to prevent spontaneous combustion and explosion due to excessively high concentrations. When the detected concentration reaches a set range, the electrical control component controls the on / off valve 15 and the control valve 14 to open, simultaneously delivering nitrogen gas into the powder silo body 1 through the delivery pipes 13 and the inert gas delivery pipes 9. This multi-directional nitrogen filling ensures that flammable and explosive gases are promptly discharged from the powder silo body 1, improving safety performance.

[0037] In summary, when this hot blast stove's pulverized coal silo is in operation, nitrogen is introduced to replace the flammable and explosive gases inside the silo body 1. The gas is then discharged through the dust filter, thus achieving pressure relief and cooling. In the event of an explosion, the high pressure will force open the explosion-proof cover 6, allowing for explosion venting through the explosion-proof port 4. After the explosion is vented, the explosion-proof cover 6 can be reset under the action of a spring, allowing for reuse. The temperature detector 10 and pressure detector 11 can monitor the pressure and temperature inside the silo body 1 in real time, enabling timely nitrogen injection for cooling and pressure reduction, thus ensuring the safety of pulverized coal storage and use.

[0038] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the protection scope of this utility model.

Claims

1. A coal powder bin for a hot blast stove, comprising a powder bin body, a dust collector and a coal powder feeding pipe being provided at a top end of the powder bin body, characterized in that, Also includes: An explosion-proof assembly includes an explosion-proof port located at the top of the powder hopper body, an explosion-proof pipe connected at one end to the explosion-proof port, and an explosion-proof cover hinged inside the explosion-proof port. The explosion-proof cover is provided with a reset element for automatic resetting. A baffle plate is disposed inside the explosion-proof pipe, and the baffle plate is provided with a plurality of through holes; An inert gas conveying pipeline is provided for conveying inert gas into the powder silo body. The inert gas conveying pipeline is located at the bottom end of one side of the powder silo body and is equipped with an on / off valve.

2. The pulverized coal silo for a hot blast stove according to claim 1, characterized in that, The reset component is a compression spring, one end of which is connected to the inner side of the explosion-proof cover, and the other end of which is connected to the inner wall of the explosion-proof opening.

3. The pulverized coal silo for a hot blast stove according to claim 1 or 2, characterized in that, The inner wall of the explosion-proof opening is provided with a sealing protrusion along its circumference, which fits against the inner side of the explosion-proof cover, and a sealing layer is provided on the upper end surface of the sealing protrusion.

4. The pulverized coal silo for a hot blast stove according to claim 3, characterized in that, A hinge is provided on the outer side of the explosion-proof cover, and the other end of the hinge is installed on the top of the powder hopper body.

5. The pulverized coal silo for a hot blast stove according to claim 4, characterized in that, Temperature detectors and pressure detectors are installed at the bottom, middle and top of the powder hopper body. The signal output terminals of the temperature detectors and pressure detectors are connected to the signal receiving terminals of the electrical control components. The signal receiving terminal of the on / off valve is connected to the signal output terminal of the electrical control components.

6. The pulverized coal silo for a hot blast stove according to claim 5, characterized in that, The top of the powder hopper body is equipped with a dual gas detector for detecting oxygen and carbon monoxide concentrations. The signal output terminal of the dual gas detector is connected to the signal receiving terminal of the electrical control component.

7. The pulverized coal silo for a hot blast stove according to claim 6, characterized in that, The top of the powder hopper body is also provided with at least two conveying pipes for filling the powder hopper body with inert gas. Each conveying pipe is provided with a control valve, and the signal receiving end of the control valve is connected to the signal receiving end of the electrical control component.

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