Blast furnace coal powder heating device

Abstract

The application provides a blast furnace pulverized coal heating device, which comprises a device body, a coal conveying heat exchange pipe is internally arranged in the device body, a motor is fixedly arranged on the surface of one end of the coal conveying heat exchange pipe, a plug cover is threadedly connected to the other end of the coal conveying heat exchange pipe, and a feeding mechanism and a cleaning mechanism are arranged in the coal conveying heat exchange pipe. The blast furnace pulverized coal heating device effectively solves the problem of uneven preheating temperature of the pulverized coal by arranging the feeding mechanism. The motor drives the rotating block and the first connecting rod to rotate, so that the spiral blade pushes the pulverized coal to spiral forward in the coal conveying heat exchange pipe. The conveying mode makes the pulverized coal continuously tumble and mix, and fully contact with the inner wall of the coal conveying heat exchange pipe, so that the heat transferred by the heating medium through the pipe wall uniformly acts on the pulverized coal. No matter where the pulverized coal is located in the pipe, similar heat can be obtained, the preheating temperature difference of the pulverized coal at different positions is greatly reduced, the combustion efficiency of the pulverized coal is improved, and local unburned pulverized coal is prevented from blocking the blast furnace column.

Description

Technical Field

[0001] This utility model relates to the field of blast furnace pulverized coal heating, and more specifically, to a blast furnace pulverized coal heating device. Background Technology

[0002] In blast furnace ironmaking, pulverized coal, as an important fuel and reducing agent, plays a crucial role in the stable operation of the blast furnace and the quality of molten iron. To improve the combustion efficiency and enhance the reactivity of pulverized coal, it is necessary to heat-treat it. Research in blast furnace pulverized coal heating focuses on developing efficient and stable heating devices to precisely control the temperature of pulverized coal, meet the requirements of different blast furnace operating conditions, and thus ensure the high efficiency, energy saving, and environmental protection of the ironmaking process.

[0003] The prior art disclosed in patent publication (announcement) number CN216891046U is an integrated heating device for pulverized coal in a blast furnace, including a heater body with a closed cylindrical structure. At least one coal conveying heat exchange pipe is inserted into the heater body. The outer wall of the coal conveying heat exchange pipe and the inner wall of the heater body form a heat exchange cavity. A heating medium inlet is provided at one end of the heat exchange cavity, and a heating medium outlet is provided at the other end of the heat exchange cavity. Multiple heating units are arranged equidistantly in the heat exchange cavity. Each heating unit includes a deflector plate and a flow divider plate. The outer side of the deflector plate is close to the inner wall of the heater body. The deflector plate is set at a certain angle to the axis of the heater body. The deflector plate is arranged in a semi-elliptical ring shape in the heat exchange cavity. Each heating unit is provided with two deflector plates, one upper and one lower. The two deflector plates are horizontally mirrored vertically and staggered horizontally by a certain distance.

[0004] The aforementioned patent document discloses an integrated pulverized coal heating device for blast furnaces. While this solves the problem of insufficient combustion of pulverized coal at the blast furnace tuyeres due to short residence time and insufficient travel distance, leading to reduced pulverized coal utilization and limited blast furnace production capacity, its shortcomings are as follows:

[0005] In the blast furnace pulverized coal integral heating device of the above-mentioned comparative patent, the heating medium is deflected by the deflector plate and the flow divider plate in the heat exchange chamber. However, when the pulverized coal flows in the coal conveying heat exchange tube, the preheating temperature of the pulverized coal at different locations may vary greatly due to uneven flow velocity or the limitation of the length of the heat exchange tube. Uneven temperature will reduce the combustion efficiency of pulverized coal and may even cause local unburned pulverized coal to block the blast furnace charge column.

[0006] Furthermore, after prolonged use, coal dust may accumulate on the inner wall of the coal conveying heat exchange tube, and the lack of a dedicated cleaning structure makes internal cleaning extremely difficult. Incomplete cleaning will affect the heat exchange efficiency of the device and may even lead to device malfunction.

[0007] Therefore, we have made improvements to this and proposed a blast furnace pulverized coal heating device. Utility Model Content

[0008] To address the shortcomings of existing technologies, this utility model provides a blast furnace pulverized coal heating device, which solves the problems mentioned in the background art.

[0009] To achieve the above-mentioned objectives, this utility model provides the following technical solution:

[0010] A blast furnace pulverized coal heating device was developed to solve the above problems.

[0011] The application is as follows:

[0012] The device includes a main body, inside which a coal conveying heat exchange tube is installed. A heating medium inlet is installed on the upper surface of the main body, and a heating medium outlet is installed on the lower surface of the main body. A feed pipe is fixedly installed on the upper surface of one end of the coal conveying heat exchange tube, and a discharge pipe is fixedly installed on the lower surface of the other end of the coal conveying heat exchange tube. A motor is fixedly installed on the surface of one end of the coal conveying heat exchange tube, and a plug is threaded to the outside of the other end of the coal conveying heat exchange tube. A conveying mechanism and a cleaning mechanism are provided inside the coal conveying heat exchange tube.

[0013] The material conveying mechanism includes two rotating blocks. The two rotating blocks are rotatably connected to the inner wall of the plug at one end of the coal conveying heat exchange pipe. The output end of the motor is fixedly connected to the rotating block on the inner wall of the coal conveying heat exchange pipe. A first connecting rod is connected between the two rotating blocks, and a spiral blade is fixedly installed on the outside of the first connecting rod.

[0014] As a preferred technical solution of this application, rectangular blocks are fixedly installed on the surfaces of both ends of the first connecting rod, and a rectangular slot is opened on one side surface of the rotating block. The rectangular blocks and the rectangular slot are connected by a snap-fit ​​connection.

[0015] As a preferred technical solution of this application, the cleaning mechanism includes a second connecting rod, and rectangular blocks are fixedly installed on both ends of the second connecting rod.

[0016] As a preferred technical solution of this application, four fixing rods are fixedly installed on the outer surface of the second connecting rod, and sliding rods are connected inside the fixing rods. Cleaning brushes are fixedly installed on the other end of the two sliding rods on the same side.

[0017] As a preferred technical solution of this application, the fixed rod has a sliding groove inside, and the sliding rod is slidably connected to the sliding groove.

[0018] As a preferred technical solution of this application, a stop block is slidably connected inside the slide groove, and one end of the sliding rod is fixedly connected to the stop block. A spring is fixedly installed between the stop block and the inner wall of the slide groove.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] In the scheme of this application:

[0021] 1. This blast furnace pulverized coal heating device effectively solves the problem of uneven pulverized coal preheating temperature by setting up a conveying mechanism. The motor drives the rotating block and the first connecting rod to rotate, causing the spiral blades to propel the pulverized coal forward spirally within the coal conveying heat exchange tube. This conveying method allows the pulverized coal to continuously tumble and mix, ensuring full contact with the inner wall of the coal conveying heat exchange tube, so that the heat transferred by the heating medium through the tube wall is evenly distributed to the pulverized coal. Regardless of the position of the pulverized coal within the tube, it receives similar heat, greatly reducing the preheating temperature difference between different positions, improving pulverized coal combustion efficiency, and preventing localized unburned pulverized coal from clogging the blast furnace burden.

[0022] 2. The cleaning mechanism in this device cleverly solves the problem of difficult cleaning of the inner wall of the coal conveying heat exchanger tubes. The second connecting rod of the cleaning mechanism is connected to the rotating block through a rectangular clamping block and rotates synchronously with the conveying mechanism. Inside the fixed rod on the second connecting rod, the sliding rod, under the action of a spring, keeps the cleaning brush in close contact with the tube wall. During the operation of the device, the cleaning brush continuously cleans the tube wall, brushing off the accumulated coal dust and discharging it with the normal coal dust flow. This real-time cleaning method requires no additional shutdown operation, ensuring the heat exchange efficiency of the device and reducing the risk of device failure due to coal dust accumulation. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0024] Figure 2 This is a three-dimensional structural diagram of the material conveying mechanism of this utility model;

[0025] Figure 3 This is a cross-sectional structural diagram of the material conveying mechanism of this utility model;

[0026] Figure 4 This is a schematic diagram of the rectangular card block and rectangular card slot of this utility model;

[0027] Figure 5 This is a three-dimensional structural diagram of the cleaning mechanism of this utility model;

[0028] Figure 6 This is a cross-sectional structural diagram of the stop block and spring of this utility model.

[0029] The image shows:

[0030] 1. Device body; 2. Coal conveying heat exchanger pipe; 3. Heating medium inlet; 4. Heating medium outlet; 5. Feed pipe; 6. Discharge pipe; 7. Motor; 8. Conveying mechanism; 801. Rotating block; 802. First connecting rod; 803. Spiral blade; 804. Rectangular locking block; 805. Rectangular locking groove; 9. Plug; 10. Cleaning mechanism; 1001. Second connecting rod; 1002. Fixed rod; 1003. Sliding rod; 1004. Cleaning brush; 1005. Slide groove; 1006. Stop block; 1007. Spring. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described examples are only some embodiments of this utility model, and not all embodiments.

[0032] Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely to illustrate some embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0033] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] In the description of this utility model, it should be noted that the terms "upper" and "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. These terms 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 on this utility model. In addition, the terms "first" and "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] To address the technical problems in the background section, the following blast furnace pulverized coal heating device is provided:

[0037] Combination Figure 1 - Figure 6As shown, the present invention provides a blast furnace pulverized coal heating device, comprising a device body 1, a coal conveying heat exchange pipe 2 installed inside the device body 1, a heating medium inlet 3 installed on the upper surface of the device body 1, and a heating medium outlet 4 installed on the lower surface of the device body 1. A feed pipe 5 is fixedly installed on the upper surface of one end of the coal conveying heat exchange pipe 2, and a discharge pipe 6 is fixedly installed on the lower surface of the other end of the coal conveying heat exchange pipe 2. A motor 7 is fixedly installed on the surface of one end of the coal conveying heat exchange pipe 2, and a motor 7 is fixedly installed on the exterior of the other end of the coal conveying heat exchange pipe 2. The threaded connection is provided with a plug 9. The inside of the coal conveying heat exchange pipe 2 is provided with a material conveying mechanism 8 and a cleaning mechanism 10. The material conveying mechanism 8 includes a rotating block 801, and there are two rotating blocks 801. The two rotating blocks 801 are rotatably connected to the inner wall of the plug 9 at one end of the coal conveying heat exchange pipe 2. The output end of the motor 7 is fixedly connected to the rotating block 801 on the inner wall of the coal conveying heat exchange pipe 2. A first connecting rod 802 is connected between the two rotating blocks 801, and a spiral blade 803 is fixedly installed on the outside of the first connecting rod 802.

[0038] In this embodiment: the device body 1 serves as an overall frame, and the coal conveying heat exchange pipe 2 installed inside it is the core channel for coal powder transmission and heating. The heating medium enters from the heating medium inlet 3 on the upper surface of the device body 1, exchanges heat with the coal powder in the coal conveying heat exchange pipe 2, and then flows out from the heating medium outlet 4 on the lower surface. The coal powder enters through the feed pipe 5 on the upper surface of one end of the coal conveying heat exchange pipe 2. Under the action of the conveying mechanism 8, the rotating block 801 is driven by the motor 7 to rotate, which in turn causes the first connecting rod 802 and its spiral blade 803 to rotate, pushing the coal powder to the other end. This conveying method causes the coal powder to continuously tumble and mix, making full contact with the inner wall of the coal conveying heat exchange pipe 2. The heat transferred by the heating medium through the pipe wall is evenly applied to the coal powder, greatly reducing the preheating temperature difference of coal powder at different locations, improving the coal powder combustion efficiency, and finally discharging from the discharge pipe 6. At the same time, the cleaning mechanism 10 can effectively prevent coal powder from accumulating on the inner wall of the coal conveying heat exchange pipe 2, ensuring the stable operation of the device.

[0039] In a preferred embodiment, rectangular blocks 804 are fixedly installed on the surfaces of both ends of the first connecting rod 802, and a rectangular slot 805 is provided on one side surface of the rotating block 801. The rectangular blocks 804 and the rectangular slot 805 are connected by a snap-fit ​​connection.

[0040] In this embodiment: the rectangular block 804 engages with the rectangular slot 805. Since the rectangular block 804 is embedded in the rectangular slot 805 and cannot rotate relative to it, when the motor 7 drives the rotating block 801 at one end to rotate, it can drive the first connecting rod 802 to rotate, thus providing a reliable power guarantee for the subsequent normal operation of the spiral blade 803 to realize the coal powder conveying.

[0041] In a preferred embodiment, the cleaning mechanism 10 includes a second connecting rod 1001, and rectangular locking blocks 804 are fixedly installed on both ends of the second connecting rod 1001. Four fixing rods 1002 are fixedly installed on the outer surface of the second connecting rod 1001, and sliding rods 1003 are connected inside the fixing rods 1002. Cleaning brushes 1004 are fixedly installed on the other ends of the two sliding rods 1003 on the same side.

[0042] In this embodiment: when it is necessary to clean the inner wall of the pipe, the plug 9 is rotated off, the first connecting rod 802 is removed, the second connecting rod 1001 is placed into the pipe, and the plug 9 is tightened; rectangular locking blocks 804 are firmly installed on both ends of the second connecting rod 1001, and can rotate together with the rotating block 801 by engaging with the rectangular locking groove on the rotating block 801;

[0043] Four fixed rods 1002 are evenly fixedly installed on the outer surface of the second connecting rod 1001. Each fixed rod 1002 is ingeniously connected to a sliding rod 1003. The other ends of the two sliding rods 1003 on the same side are fixedly installed with a cleaning brush 1004. When the second connecting rod 1001 rotates, the cleaning brush 1004 will rotate accordingly to clean the inner wall of the coal conveying heat exchange tube 2, effectively removing residual coal powder and other impurities, and ensuring the unobstructed and clean interior of the coal conveying heat exchange tube 2.

[0044] In a preferred embodiment, the fixed rod 1002 has a groove 1005 inside, and the sliding rod 1003 is slidably connected to the groove 1005. A stop 1006 is slidably connected inside the groove 1005, and one end of the sliding rod 1003 is fixedly connected to the stop 1006. A spring 1007 is fixedly installed between the stop 1006 and the inner wall of the groove 1005.

[0045] In this embodiment: the stop 1006 provided in the chute 1005 is fixedly connected to one end of the sliding rod 1003, which can effectively prevent the sliding rod 1003 from slipping out of the chute 1005; during the cleaning process, when encountering thick local dirt or foreign objects blocking the inner wall of the coal conveying heat exchange pipe 2, the sliding rod 1003 is compressed by the spring 1007, so that the cleaning brush 1004 can automatically adjust the pressure and position with the pipe wall according to the actual situation, avoiding damage to the cleaning brush 1004 or the pipe wall due to hard contact. The spring 1007 pushes the stop 1006 with its own elastic restoring force to drive the sliding rod 1003 to reset, ensuring that the cleaning brush 1004 always maintains a suitable contact state with the pipe wall, and continuously and efficiently completes the cleaning task.

[0046] Specifically, the working principle of this solution is as follows:

[0047] When the blast furnace pulverized coal heating device is working, the heating medium enters from the heating medium inlet 3 on the upper surface of the device body 1, exchanges heat with the pulverized coal in the internal coal conveying heat exchange pipe 2, and then flows out from the heating medium outlet 4 on the lower surface. The pulverized coal enters the coal conveying heat exchange pipe 2 through the feed pipe 5. The motor 7 drives the rotating block 801 at one end to rotate. Because the rectangular locking blocks 804 at both ends of the first connecting rod 802 engage with the rectangular locking slots 805 on the rotating block 801, the first connecting rod 802 rotates accordingly. The spiral blades 803 on it push the pulverized coal towards the discharge pipe 6. During this process, the pulverized coal tumbles and mixes, making full contact with the pipe wall and being heated evenly, thus improving combustion efficiency.

[0048] When cleaning the inner wall of the pipe is required, rotate the plug 9 to remove it, then take out the first connecting rod 802, and then place the second connecting rod 1001 into the pipe. The rectangular locking blocks 804 at both ends of the second connecting rod 1001 engage with the rotating block 801, and rotate with it when driven by the motor 7. Inside the fixed rod 1002 on the second connecting rod 1001, the sliding rod 1003 is slidably connected to the sliding groove 1005, and the stop block 1006 prevents the sliding rod 1003 from slipping off. When encountering dirt or foreign objects on the pipe wall, the sliding rod 1003 compresses the spring 1007, causing the cleaning brush 1004 to automatically adjust the pressure and position with the pipe wall to avoid damage; ensuring that the cleaning brush 1004 always maintains a suitable contact state with the pipe wall, ensuring stable operation of the device.

[0049] The above is the entire working process of the device, and all contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0050] The above embodiments are only used to illustrate the present utility model and are not intended to limit the technical solutions described in the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, the present utility model is not limited to the specific embodiments described above. Therefore, any modifications or equivalent substitutions to the present utility model, and all technical solutions and improvements that do not depart from the spirit and scope of the utility model, are covered within the scope of the claims of the present utility model.

Claims

1. A blast furnace pulverized coal heating device, comprising a device body (1), characterized in that: The device body (1) is equipped with a coal conveying heat exchange pipe (2) inside, and a heating medium inlet (3) is installed on the upper surface of the device body (1), and a heating medium outlet (4) is installed on the lower surface of the device body (1). A feed pipe (5) is fixedly installed on the upper surface of one end of the coal conveying heat exchange pipe (2), and a discharge pipe (6) is fixedly installed on the lower surface of the other end of the coal conveying heat exchange pipe (2). A motor (7) is fixedly installed on the surface of one end of the coal conveying heat exchange pipe (2), and a plug (9) is threadedly connected to the other end of the coal conveying heat exchange pipe (2). A conveying mechanism (8) and a cleaning mechanism (10) are provided inside the coal conveying heat exchange pipe (2). The material conveying mechanism (8) includes a rotating block (801), and there are two rotating blocks (801). The two rotating blocks (801) are rotatably connected to the inner wall of the plug (9) at one end of the coal conveying heat exchange pipe (2). The output end of the motor (7) is fixedly connected to the rotating block (801) on the inner wall of the coal conveying heat exchange pipe (2). A first connecting rod (802) is connected between the two rotating blocks (801), and a spiral blade (803) is fixedly installed on the outside of the first connecting rod (802).

2. The blast furnace pulverized coal heating device according to claim 1, characterized in that: The first connecting rod (802) has rectangular card blocks (804) fixedly installed on both ends of its surface, and a rectangular card slot (805) is opened on one side of the rotating block (801). The rectangular card blocks (804) and the rectangular card slot (805) are connected by a snap-fit ​​connection.

3. The blast furnace pulverized coal heating device according to claim 2, characterized in that: The cleaning mechanism (10) includes a second connecting rod (1001), and rectangular clips (804) are fixedly installed on both ends of the second connecting rod (1001).

4. A blast furnace pulverized coal heating device according to claim 3, characterized in that: Four fixing rods (1002) are fixedly installed on the outer surface of the second connecting rod (1001), and a sliding rod (1003) is connected inside the fixing rod (1002). A cleaning brush (1004) is fixedly installed on the other end of the two sliding rods (1003) on the same side.

5. A blast furnace pulverized coal heating device according to claim 4, characterized in that: The fixed rod (1002) has a groove (1005) inside, and the sliding rod (1003) is slidably connected to the groove (1005).

6. A blast furnace pulverized coal heating device according to claim 5, characterized in that: The slide groove (1005) is slidably connected to a stop (1006), and one end of the sliding rod (1003) is fixedly connected to the stop (1006). A spring (1007) is fixedly installed between the stop (1006) and the inner wall of the slide groove (1005).

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