Heat exchange structure of hot blast stove

Abstract

The heat exchange structure comprises a heat exchange shell, a heat inlet pipe, an air inlet pipe, a heat exchange pipe, a hot air outlet and a smoke outlet, a lower partition plate and an upper partition plate are arranged in the heat exchange shell, the lower partition plate and the upper partition plate divide the interior of the heat exchange shell into three cavities, and the three cavities are an air inlet cavity, a heat exchange cavity and a confluence cavity in sequence from bottom to top; the air inlet pipes are arranged on the side wall of the air inlet cavity, the lower ends of the heat inlet pipes are connected with a combustion chamber of the hot blast stove, the upper ends of the heat inlet pipes penetrate through the air inlet cavity to reach the heat exchange cavity, the lower ends of the heat exchange pipes are fixed to the lower partition plate, and the upper ends of the heat exchange pipes are fixed to the upper partition plate. According to the hot blast stove heat exchange structure with a special structure, combusted high-temperature smoke firstly exchanges heat with the heat exchange pipes and then enters the middle heat exchange cavity and the outer heat exchange cavity, a heat preservation effect is achieved on the inner heat exchange cavity, heat loss of a middle core area is reduced, and the heat exchange effect of the whole device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange structures, in particular to a heat exchange structure of a hot blast stove. Background Art

[0002] Hot blast furnace is a thermal power machine. It began to be widely used in my country in the late 1970s. It has become a replacement product for electric heat sources and traditional steam power heat sources in many industries. There are many varieties and complete series of hot blast furnaces. They are divided into manual burning and machine burning according to the coal adding method, and divided into coal, oil, gas furnaces, etc. according to the type of fuel. The direct high-purification hot blast furnace uses fuel to directly burn, and forms hot air through high-purification treatment, and directly contacts with the material for heating, drying or baking. The amount of fuel consumed by this method is about half of that of using steam or other indirect heaters. Improving the thermal efficiency of the hot blast furnace can effectively reduce energy consumption and save costs. The utility model provides a heat exchange structure of a hot blast furnace with high thermal efficiency. Utility Model Content

[0003] The utility model aims to provide a heat exchange structure of a hot blast stove.

[0004] The above technical objectives of the utility model are achieved through the following technical solutions:

[0005] A heat exchange structure of a hot blast stove comprises a heat exchange shell, a heat inlet pipe, an air inlet pipe, a heat exchange pipe, a hot air outlet and a smoke outlet. A lower partition and an upper partition are arranged in the heat exchange shell. The lower partition and the upper partition divide the interior of the heat exchange shell into three cavities, which are an air inlet chamber, a heat exchange chamber and a converging chamber from bottom to top. The air inlet pipe is arranged on the side wall of the air inlet chamber. The lower end of the heat inlet pipe is connected to the combustion chamber of the hot blast stove. The upper end of the heat inlet pipe passes through the air inlet chamber to reach the heat exchange chamber. The lower ends of the multiple heat exchange pipes are fixed on the lower partition and the upper ends are fixed on the lower partition. On the upper partition, the heat exchange tube connects the air inlet chamber with the converging chamber, and the hot air outlet is arranged at the top of the converging chamber. A heat exchange inner tube is arranged outside the multiple heat exchange tubes, an inner heat exchange chamber is formed inside the heat exchange inner tube, and a heat exchange outer tube is arranged outside the heat exchange inner tube. An intermediate heat exchange chamber is formed between the heat exchange inner tube and the heat exchange outer tube, and an outer heat exchange chamber is formed between the heat exchange outer tube and the heat exchange outer shell. A plurality of smoke outlets 1 are arranged on the side surface of the upper end of the heat exchange inner tube, a plurality of smoke outlets 2 are arranged on the top of the heat exchange outer tube, and a smoke outlet is arranged on the side wall of the bottom of the outer heat exchange chamber.

[0006] Furthermore, there are multiple smoke outlets, each of which is equipped with a detachable filter screen, which can be used to filter smoke generated after fuel combustion, and the filter screen can be disassembled to clean the smoke regularly.

[0007] Furthermore, the smoke outlet 1 and the smoke outlet 2 are staggeredly arranged on the circumference of the heat exchange inner cylinder and the heat exchange outer cylinder, thereby increasing the time that the smoke stays in the middle heat exchange cavity, thereby increasing the thermal efficiency.

[0008] Furthermore, there are multiple hot air outlets, and the sizes of the multiple hot air outlets are set to different sizes. By setting multiple hot air outlets, each hot air outlet can be provided with a valve and can be connected to different drying equipment to transport hot air.

[0009] Furthermore, the inlet end of the air inlet pipe is connected to a blowing device, and the blowing device is a blower, which can be selected according to design requirements.

[0010] In summary, the utility model has the following beneficial effects: the utility model designs a hot blast furnace heat exchange structure with a special structure. The burning high-temperature flue gas first exchanges heat with the heat exchange tube, and then enters the middle heat exchange cavity and the outer heat exchange cavity, thereby insulating the inner heat exchange cavity, reducing the heat loss in the middle core area, and improving the heat exchange effect of the entire device. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the internal structure of the utility model;

[0012] Figure 2 It is the internal airflow distribution diagram of the utility model;

[0013] Figure 3 yes Figure 1 A partial enlarged view of .

[0014] In the figure, 1. heat exchange shell; 2. heat inlet pipe; 3. air inlet pipe; 4. air inlet chamber; 5. lower partition; 6. heat exchange inner cylinder; 7. inner heat exchange chamber; 8. heat exchange pipe; 9. heat exchange outer cylinder; 10. middle heat exchange chamber; 11. smoke outlet 1; 12. smoke outlet 2; 13. outer heat exchange chamber; 14. smoke outlet; 15. upper partition; 16. confluence chamber; 17. hot air outlet. DETAILED DESCRIPTION

[0015] The utility model is further described in detail below in conjunction with the accompanying drawings, and the technical solutions in the embodiments of the utility model are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] like Figure 1-Figure 3As shown, a heat exchange structure of a hot blast stove comprises a heat exchange shell 1, a heat inlet pipe 2, an air inlet pipe 3, a heat exchange pipe 8, a hot air outlet 17 and a smoke outlet 14. A lower partition 5 and an upper partition 15 are arranged in the heat exchange shell 1. The lower partition 5 and the upper partition 15 divide the interior of the heat exchange shell 1 into three cavities, which are an air inlet chamber 4, a heat exchange chamber and a converging chamber 17 from bottom to top. The air inlet pipe 3 is arranged on the side wall of the air inlet chamber 4. The lower end of the heat inlet pipe 2 is connected to the combustion chamber of the hot blast stove. The upper end of the heat inlet pipe 2 passes through the air inlet chamber 4 to reach the heat exchange chamber. The lower ends of the plurality of heat exchange pipes 8 are fixed on the lower partition 5 and the upper ends are fixed on the upper partition. On the plate 15, the heat exchange tube 8 connects the air inlet chamber 4 with the confluence chamber 16, and the hot air outlet 17 is arranged at the top of the confluence chamber 16. A heat exchange inner tube 6 is arranged outside the plurality of heat exchange tubes 8, and an inner heat exchange chamber 7 is formed inside the heat exchange inner tube 6. A heat exchange outer tube 9 is arranged outside the heat exchange inner tube 6, and an intermediate heat exchange chamber 10 is formed between the heat exchange inner tube 6 and the heat exchange outer tube 9. An outer heat exchange chamber 13 is formed between the heat exchange outer tube 9 and the heat exchange outer shell 1. A plurality of smoke outlets 11 are arranged on the side surface of the upper end of the heat exchange inner tube 6, a plurality of smoke outlets 2 12 are arranged on the top of the heat exchange outer tube 9, and a smoke outlet 14 is arranged on the side wall of the bottom of the outer heat exchange chamber 13.

[0017] Furthermore, there are multiple smoke outlets 14, and each smoke outlet 14 is equipped with a detachable filter screen, which can be used to filter smoke generated after fuel combustion, and the filter screen can be disassembled and the smoke can be cleaned regularly.

[0018] Furthermore, the smoke outlet 1 11 and the smoke outlet 2 12 are staggered on the circumference of the heat exchange inner cylinder 6 and the heat exchange outer cylinder 9 to increase the time the smoke stays in the middle heat exchange cavity 10, thereby increasing the thermal efficiency.

[0019] Furthermore, there are multiple hot air outlets 17, and the sizes of the multiple hot air outlets 17 are set to different sizes. By setting multiple hot air outlets 17, each hot air outlet 17 can be provided with a valve and can be connected to different drying equipment to transport hot air.

[0020] Furthermore, the inlet end of the air inlet pipe 3 is connected to a blowing device, and the blowing device is a blower, which can be selected according to design requirements.

[0021] Working principle: Figure 2 and Figure 3As shown, the flue gas generated by the combustion of the hot blast furnace enters the inner heat exchange chamber 7 through the heat inlet pipe 2, the fresh air enters the air inlet chamber 4 from the air inlet pipe 3, and then enters the heat exchange tube 8 from the air inlet chamber 4 to exchange heat with the high-temperature flue gas in the inner heat exchange chamber 7. The airflow in the heat exchange tube 8 is heated and enters the confluence chamber 16, and then is transported to the device that needs to be heated through the hot gas outlet 17; the high-temperature flue gas after heat exchange in the inner heat exchange chamber 7 enters the intermediate heat exchange chamber 10 through the top smoke outlet 11, and forms a thermal insulation layer on the outside of the heat exchange inner tube 6; the flue gas in the intermediate heat exchange chamber 10 enters the outer heat exchange chamber 13 through the smoke outlet 2 12, and forms a thermal insulation layer on the outside of the heat exchange outer tube 9; finally, the cooled flue gas is discharged from the smoke outlet 14. The solution designed by the utility model makes full use of the waste heat of the flue gas to carry out heat exchange and form a thermal insulation layer, reduces the heat transfer in the central area of ​​the heat exchange, and improves the thermal efficiency.

[0022] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as the modifications are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A heat exchange structure of a hot air stove, comprising a heat exchange shell (1), a heat inlet pipe (2), an air inlet pipe (3), a heat exchange pipe (8), a hot air outlet (17) and a smoke outlet (14), characterized in that: The heat exchange shell (1) is provided with a lower partition (5) and an upper partition (15), and the lower partition (5) and the upper partition (15) divide the interior of the heat exchange shell (1) into three cavities, which are, from bottom to top, an air inlet chamber (4), a heat exchange chamber and a confluence chamber (16). The air inlet pipe (3) is arranged on the side wall of the air inlet chamber (4), the lower end of the heat inlet pipe (2) is connected to the combustion chamber of the hot air furnace, and the upper end of the heat inlet pipe (2) passes through the air inlet chamber (4) to reach the heat exchange chamber. The lower ends of a plurality of heat exchange pipes (8) are fixed on the lower partition (5) and the upper ends are fixed on the upper partition (15). The heat exchange pipes (8) connect the air inlet chamber (4) with the confluence chamber (16), and the heat The gas outlet (17) is arranged at the top of the confluence cavity (16); a heat exchange inner cylinder (6) is arranged outside the plurality of heat exchange tubes (8); an inner heat exchange cavity (7) is formed inside the heat exchange inner cylinder (6); a heat exchange outer cylinder (9) is arranged outside the heat exchange inner cylinder (6); an intermediate heat exchange cavity (10) is formed between the heat exchange inner cylinder (6) and the heat exchange outer cylinder (9); an outer heat exchange cavity (13) is formed between the heat exchange outer cylinder (9) and the heat exchange outer shell (1); a plurality of smoke outlets (11) are arranged on the side surface of the upper end of the heat exchange inner cylinder (6); a plurality of smoke outlets (12) are arranged on the top of the heat exchange outer cylinder (9); and a smoke outlet (14) is arranged on the bottom side wall of the outer heat exchange cavity (13).

2. The heat exchange structure of a hot blast stove according to claim 1, characterized in that: There are a plurality of smoke outlets (14), and each smoke outlet (14) is mounted with a detachable filter.

3. The heat exchange structure of a hot blast stove according to claim 2, characterized in that: The smoke outlet 1 (11) and the smoke outlet 2 (12) are staggeredly arranged on the circumference of the heat exchange inner cylinder (6) and the heat exchange outer cylinder (9).

4. The heat exchange structure of a hot blast stove according to claim 3, characterized in that: The number of the hot air outlets (17) is multiple, and the sizes of the multiple hot air outlets (17) are set to different sizes.

5. The heat exchange structure of a hot blast stove according to claim 4, characterized in that: The inlet end of the air inlet pipe (3) is connected to the air blowing device.

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