A blast furnace pulverized coal injection preheating system

Abstract

This utility model relates to the field of blast furnace pulverized coal injection technology, specifically a blast furnace pulverized coal injection preheating system, including a conveying pipe. A heat exchange pipe is sleeved on the upper part of the outer wall of the conveying pipe, and an electric heating tape is wound around the lower part of the outer wall of the conveying pipe. During operation, the hot blast and waste air generated during blast furnace smelting are introduced into the heat exchange pipe through the air inlet pipe, exchanging heat with the conveying pipe to preheat the pulverized coal inside the conveying pipe. This improves energy utilization and reduces waste. The heat generated by the electric heating tape and the insulation effect of the insulation cotton keep the lower half of the conveying pipe at a high temperature, further improving the preheating effect, increasing the temperature of the pulverized coal, reducing the heat absorbed by the pulverized coal after entering the blast furnace, and improving the blast furnace thermal efficiency. Furthermore, when the hot blast and waste air supply is unstable, hot air generated by an external hot air fan can be introduced into the air inlet pipe to ensure stable heat exchange, making the preheating temperature more stable, thereby effectively improving preheating efficiency and energy utilization.

Description

Technical Field

[0001] This utility model relates to the field of blast furnace pulverized coal injection technology, specifically a blast furnace pulverized coal injection preheating system. Background Technology

[0002] In the steel smelting process, pulverized coal injection into blast furnaces is an important energy-saving and consumption-reducing technology. By injecting pulverized coal into the blast furnace to replace part of the coke, production costs can be effectively reduced and environmental pollution can be reduced. In traditional pulverized coal injection processes, the pulverized coal temperature is relatively low, requiring it to absorb a large amount of heat before combustion in the blast furnace, leading to a decrease in blast furnace thermal efficiency. Although some preheating devices exist in existing technologies, they suffer from problems such as unstable preheating temperature and low thermal efficiency. Therefore, improving preheating efficiency and energy utilization is one of the problems that needs to be solved in the current operation of blast furnace pulverized coal injection systems. To address this, a blast furnace pulverized coal injection preheating system is proposed. Utility Model Content

[0003] The purpose of this invention is to provide a blast furnace pulverized coal injection preheating system to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a blast furnace pulverized coal injection preheating system, comprising a conveying pipe, a heat exchange pipe sleeved on the upper part of the outer side wall of the conveying pipe, an electric heating tape wrapped around the lower part of the outer side wall of the conveying pipe, the outer side wall of the electric heating tape covered with insulation cotton, a feed pipe connected to the top of the conveying pipe, a feed hopper connected to the top of the feed pipe, an air inlet pipe one and an air inlet pipe two connected to the outer side wall of the conveying pipe respectively, the air inlet pipe one being connected to hot blast and waste air generated by blast furnace smelting, the air inlet pipe two being connected to an external hot air blower, exhaust holes evenly opened at the bottom of the heat exchange pipe, and a connecting pipe connected to the bottom of the conveying pipe.

[0005] As a further preferred embodiment of this technical solution: a filter plate is provided at the top of the inside of the feed pipe, a bracket is fixedly connected to the lower part of the left side wall of the feed hopper, a motor is installed on the inner side wall of the bracket, one end of the output shaft of the motor extends into the inside of the feed hopper and is fixedly connected to a connecting shaft, and flexible rubber strips are uniformly fixedly connected to the outer side wall of the connecting shaft.

[0006] As a further preferred embodiment of this technical solution: a cover plate is hinged to one side of the upper surface of the feed hopper, and a handle is fixedly connected to the right side of the upper surface of the cover plate.

[0007] As a further preferred embodiment of this technical solution: a slot is provided on the top of the right side wall of the feed pipe, an insert plate is inserted into the inner side wall of the slot, a through groove is provided on the upper surface of the insert plate, and the filter plate is fixedly connected to the inner side wall of the through groove.

[0008] As a further preferred embodiment of this technical solution: a fixing block is fixedly connected to the front side of the right side wall of the feed pipe, and a push rod is threadedly connected to the front surface of the fixing block.

[0009] As a further preferred embodiment of this technical solution, a knob is fixedly connected to the front end of the top rod.

[0010] As a further preferred embodiment of this technical solution: a pull ring is fixedly connected to the right side wall of the insert plate.

[0011] As a further preferred embodiment of this technical solution: a mounting plate is fixedly connected to the right side of the front surface of the conveying pipe, and a control panel is mounted on the front surface of the mounting plate. The electrical output terminal of the control panel is electrically connected to the electrical input terminal of the motor through a wire.

[0012] Compared with the prior art, the beneficial effects of this utility model are: In operation, this invention introduces hot blast and waste air generated during blast furnace smelting into the heat exchange pipe through the first air inlet pipe. This allows for heat exchange with the conveying pipe, preheating the pulverized coal inside the conveying pipe, improving energy utilization and reducing waste. Furthermore, the heat generated by the electric heating tape and the insulation effect of the insulating cotton maintain a high temperature in the lower half of the conveying pipe, further enhancing the preheating effect, increasing the temperature of the pulverized coal, reducing the heat absorbed by the pulverized coal upon entering the blast furnace, and improving the blast furnace's thermal efficiency. When the hot blast and waste air supply is unstable, hot air generated by an external hot air blower can be introduced into the second air inlet pipe to ensure stable heat exchange and a more stable preheating temperature. This effectively improves preheating efficiency and energy utilization, bringing convenience to the blast furnace pulverized coal injection system. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is a cross-sectional view of the feed hopper in this utility model; Figure 4 This is a schematic diagram of the structure of the feed pipe and feed hopper in this utility model; Figure 5 In this utility model Figure 4 Enlarged view of the structure of area A; Figure 6 This is a schematic diagram of the structure of the feed tube and slot in this utility model; Figure 7 This is a schematic diagram of the structure of the insert plate and filter plate in this utility model.

[0014] In the picture: 1. Conveying pipe; 2. Heat exchanger pipe; 3. Air inlet pipe one; 4. Air inlet pipe two; 5. Exhaust vent; 6. Electric heating tape; 7. Insulation cotton; 8. Connecting pipe; 9. Feed pipe; 10. Feed hopper; 11. Filter plate; 12. Support; 13. Motor; 14. Connecting shaft; 15. Flexible rubber strip; 16. Cover plate; 17. Handle; 18. Slot; 19. Insert plate; 20. Through groove; 21. Fixing block; 22. Top rod; 23. Knob; 24. Pull ring; 25. Mounting plate; 26. Control panel. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "equipment" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0017] Please see Figure 1-7This utility model provides a technical solution: a blast furnace pulverized coal injection preheating system, including a conveying pipe 1, a heat exchange pipe 2 sleeved on the upper part of the outer wall of the conveying pipe 1, an electric heating tape 6 wrapped around the lower part of the outer wall of the conveying pipe 1, and insulation cotton 7 covering the outer wall of the electric heating tape 6. A feed pipe 9 is connected to the top of the conveying pipe 1, and a feed hopper 10 is connected to the top of the feed pipe 9. An air inlet pipe 3 and an air inlet pipe 4 are connected to the outer wall of the conveying pipe 1 respectively. The air inlet pipe 3 introduces hot blast and waste air generated during blast furnace smelting, and the air inlet pipe 4 is connected to an external hot air blower. Exhaust holes 5 are evenly distributed at the bottom of the heat exchange pipe 2, and a connecting pipe 8 is connected to the bottom of the conveying pipe 1. The hot blast and waste air generated during blast furnace smelting are directed along... The air inlet pipe 3 leads to the heat exchange pipe 2, which exchanges heat with the conveying pipe 1, thus preheating the pulverized coal inside the conveying pipe 1. This improves energy utilization and reduces waste. The heat generated by the electric heating tape 6 and the insulation effect of the insulation cotton 7 keep the lower half of the conveying pipe 1 at a high temperature, further improving the preheating effect, increasing the temperature of the pulverized coal, reducing the heat absorbed by the pulverized coal after entering the blast furnace, and improving the thermal efficiency of the blast furnace. Moreover, when the hot air and exhaust air cannot be supplied stably, hot air generated by an external hot air fan can be introduced into the air inlet pipe 4 to ensure stable heat exchange and make the preheating temperature more stable. This effectively improves the preheating efficiency and energy utilization, bringing convenience to the operation of the blast furnace pulverized coal injection system.

[0018] In this embodiment, specifically: a filter plate 11 is provided at the top of the inside of the feed pipe 9, a bracket 12 is fixedly connected to the lower part of the left side wall of the feed hopper 10, a motor 13 is installed on the inner side wall of the bracket 12, one end of the output shaft of the motor 13 extends into the inside of the feed hopper 10 and is fixedly connected to a connecting shaft 14, and flexible rubber strips 15 are evenly fixedly connected to the outer side wall of the connecting shaft 14; after coal powder is added to the feed hopper 10, the motor 13 works to drive the connecting shaft 14 and the flexible rubber strips 15 to rotate, and the flexible rubber strips 15 repeatedly beat the filter plate 11, which can break up the clumps of coal powder, and the vibration generated by beating can accelerate the falling of coal powder, thereby ensuring the quality of the supplied coal powder.

[0019] In this embodiment, specifically: a cover plate 16 is hinged to one side of the upper surface of the feed hopper 10, and a handle 17 is fixedly connected to the right side of the upper surface of the cover plate 16; after adding coal powder, closing the cover plate 16 can reduce the escape of coal powder, and the handle 17 is designed to facilitate opening and closing the cover plate 16.

[0020] In this embodiment, specifically: a slot 18 is provided on the top of the right side wall of the feed pipe 9, an insert plate 19 is inserted into the inner side wall of the slot 18, a through groove 20 is provided on the upper surface of the insert plate 19, and the filter plate 11 is fixedly connected to the inner side wall of the through groove 20; the insert plate 19 is pulled out periodically to facilitate the cleaning of impurities on the filter plate 11.

[0021] In this embodiment, specifically: a fixing block 21 is fixedly connected to the front side of the right side wall of the feed pipe 9, and a push rod 22 is threadedly connected to the front surface of the fixing block 21; tightening the push rod 22 to press against the insert plate 19 can lock the insert plate 19 to prevent it from moving accidentally.

[0022] In this embodiment, specifically: a knob 23 is fixedly connected to the front end of the push rod 22; this facilitates turning the push rod 22.

[0023] In this embodiment, specifically: a pull ring 24 is fixedly connected to the right side wall of the insert plate 19; to facilitate the movement of the insert plate 19.

[0024] In this embodiment, specifically: a mounting plate 25 is fixedly connected to the right side of the front surface of the conveying pipe 1, and a control panel 26 is mounted on the front surface of the mounting plate 25. The electrical output terminal of the control panel 26 is electrically connected to the electrical input terminal of the motor 13 through a wire; this facilitates the control of the working state of the motor 13.

[0025] The working principle of this utility model is as follows: the hot blast and exhaust air generated by blast furnace smelting are introduced into the heat exchange pipe 2 through the air inlet pipe 3, and exchange heat with the conveying pipe 1, thereby preheating the pulverized coal inside the conveying pipe 1, improving energy utilization and reducing waste. Furthermore, the heat generated by the electric heating tape 6 and the insulation effect of the insulation cotton 7 keep the lower half of the conveying pipe 1 at a high temperature, further improving the preheating effect, increasing the temperature of the pulverized coal, reducing the heat absorbed by the pulverized coal after entering the blast furnace, and improving the thermal efficiency of the blast furnace. Moreover, when the hot blast and exhaust air cannot be stably controlled... During scheduled supply, hot air generated by an external hot air blower can be introduced into the air inlet pipe 4 to ensure stable heat exchange and make the preheating temperature more stable, thereby effectively improving preheating efficiency and energy utilization, and bringing convenience to the operation of the blast furnace pulverized coal injection system. After adding pulverized coal into the feed hopper 10, the motor 13 drives the connecting shaft 14 and the flexible rubber strip 15 to rotate. The flexible rubber strip 15 repeatedly beats the filter plate 11, which can break up the clumps of pulverized coal, and the vibration generated by beating can accelerate the falling of pulverized coal, thereby ensuring the quality of the supplied pulverized coal.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A blast furnace pulverized coal injection preheating system, characterized in that: The system includes a conveying pipe (1), a heat exchange pipe (2) is fitted on the upper part of the outer side wall of the conveying pipe (1), an electric heating tape (6) is wrapped around the lower part of the outer side wall of the conveying pipe (1), the outer side wall of the electric heating tape (6) is covered with heat insulation cotton (7), the top of the conveying pipe (1) is connected to a feed pipe (9), the top of the feed pipe (9) is connected to a feed hopper (10), the outer side wall of the conveying pipe (1) is connected to an air inlet pipe one (3) and an air inlet pipe two (4), the air inlet pipe one (3) is connected to the hot air and waste air generated by blast furnace smelting, the air inlet pipe two (4) is connected to an external hot air blower, the bottom of the heat exchange pipe (2) is evenly provided with exhaust holes (5), and the bottom of the conveying pipe (1) is connected to a connecting pipe (8).

2. The blast furnace pulverized coal injection preheating system according to claim 1, characterized in that: The feed pipe (9) has a filter plate (11) at the top inside. The feed hopper (10) has a bracket (12) fixedly connected to the lower left side wall. The bracket (12) has a motor (13) installed on the inner side wall. One end of the output shaft of the motor (13) extends into the feed hopper (10) and is fixedly connected to a connecting shaft (14). Flexible rubber strips (15) are evenly fixedly connected to the outer side wall of the connecting shaft (14).

3. The blast furnace pulverized coal injection preheating system according to claim 2, characterized in that: A cover plate (16) is hinged to one side of the upper surface of the feed hopper (10), and a handle (17) is fixedly connected to the right side of the upper surface of the cover plate (16).

4. The blast furnace pulverized coal injection preheating system according to claim 3, characterized in that: A slot (18) is provided on the top right side wall of the feed pipe (9). A plate (19) is inserted into the inner side wall of the slot (18). A through groove (20) is provided on the upper surface of the plate (19). The filter plate (11) is fixedly connected to the inner side wall of the through groove (20).

5. The blast furnace pulverized coal injection preheating system according to claim 4, characterized in that: A fixing block (21) is fixedly connected to the front side of the right side wall of the feed pipe (9), and a push rod (22) is threadedly connected to the front surface of the fixing block (21).

6. The blast furnace pulverized coal injection preheating system according to claim 5, characterized in that: A knob (23) is fixedly connected to the front end of the top rod (22).

7. The blast furnace pulverized coal injection preheating system according to claim 6, characterized in that: A pull ring (24) is fixedly connected to the right side wall of the insert plate (19).

8. The blast furnace pulverized coal injection preheating system according to claim 7, characterized in that: A mounting plate (25) is fixedly connected to the right side of the front surface of the conveying pipe (1). A control panel (26) is mounted on the front surface of the mounting plate (25). The electrical output terminal of the control panel (26) is electrically connected to the electrical input terminal of the motor (13) through a wire.

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