Hot blast stove with self-cooling function

Abstract

The utility model relates to the technical field of hot blast stoves, in particular to a hot blast stove with a self-cooling function, which comprises a shell and a supporting seat, the supporting seat is fixedly mounted at the lower end of the shell, an inner container is arranged in the shell, an interlayer guide plate is spirally arranged on the outer wall of the inner container, and an air outlet is arranged at one end of the inner container. A combustor is mounted at the other end through a flame protection pipe; a rotational flow guide plate is arranged at the joint of the flame protection pipe and the inner container, and second burner air inlets are symmetrically formed in the side walls of the upper end and the lower end of the flame protection pipe. The interlayer is arranged between the shell and the inner container, and the interlayer flow guide plate is arranged on the inner container, so that the interlayer flow guide plate not only increases the heat conductivity coefficient of the inner container and air, enhances heat exchange between the inner container and cold air and cools the inner container, but also increases the strength of the inner container, reduces the consumption of steel and prolongs the service life of the inner container.

Description

Technical Field

[0001] The utility model relates to the technical field of hot blast stoves, in particular to a hot blast stove with a self-cooling function. 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 source and traditional steam power heat source in many industries. There are many varieties and 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.

[0003] The function of the hot blast furnace in an ironmaking blast furnace is to heat the blast air to the required temperature in order to improve the benefit and efficiency of the blast furnace; it works on the principle of "heat storage". The coal gas is burned in the combustion chamber, and the high-temperature exhaust gas passes through the checker bricks and stores heat. When the checker bricks are fully heated, the hot blast furnace can be changed to air supply. At this time, the relevant combustion valves are closed, and the air supply valves are opened. The cold air is heated and sent out through the checker bricks.

[0004] In the prior art, the high temperature radiation generated by the combustion of fuel in the burner will heat the inner pot, and the burner will continue to heat the inner pot when working. After long-term use, the inner pot will be burned, affecting the use of the hot air stove. To this end, the utility model proposes a hot air stove with a self-cooling function to solve the above problem. Utility Model Content

[0005] The purpose of the utility model is to provide a hot air stove with a self-cooling function to solve the problems raised in the above background technology.

[0006] To achieve the above object, the utility model provides the following technical solution: a hot air stove with a self-cooling function, comprising: a shell and a support base, the support base is fixedly installed at the lower end of the shell, an inner shell is provided inside, a sandwich guide plate is spirally provided on the outer wall of the inner shell, an air outlet is provided at one end of the inner shell, and a burner is installed at the other end through a flame protection tube;

[0007] A swirl guide plate is arranged at the connection between the flame protection tube and the inner tank, and a burner air inlet 2 is symmetrically arranged on the upper and lower end side walls of the flame protection tube.

[0008] Preferably, the air outlet is cylindrical, one end of the air outlet is connected to the inner tank, the other end of the air outlet is located outside the shell and is fixedly mounted with a connecting flange, and the outer wall of the air outlet is fixedly connected to the shell.

[0009] Preferably, a thermocouple is fixedly mounted on the upper end of the air outlet.

[0010] Preferably, an air inlet is fixedly mounted on a side wall at one end of the shell, the air inlet is connected to the interior of the shell, and the air inlet is close to the air outlet.

[0011] Preferably, one end of the flame protection tube is fixedly mounted on the inner container and communicated with the inner container, and the other end passes through the outer shell and is fixedly connected to the outer shell.

[0012] Preferably, the burner is fixedly mounted on the outer end of the flame protection tube, and the flame nozzle at one end of the burner passes through the flame protection tube and is located in the inner tank.

[0013] Preferably, a burner air inlet 1 is provided on the lower side of the outer end of the burner.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] By setting a sandwich between the outer shell and the inner liner, and setting a sandwich guide plate on the inner liner, the sandwich guide plate not only increases the thermal conductivity between the inner liner and the air, enhances the heat exchange between the inner liner and the cold air, cools the inner liner, but also increases the strength of the inner liner, reduces steel consumption, and increases the service life of the inner liner. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the main cross-section of the overall structure of the utility model;

[0017] Figure 2 It is a top view cross-sectional schematic diagram of the overall structure of the utility model.

[0018] In the figure: 1. outer shell; 2. support base; 3. liner; 4. sandwich guide plate; 5. air outlet; 6. connecting flange; 7. electric thermocouple; 8. air inlet; 9. swirl guide plate; 10. burner; 11. burner air inlet 1; 12. burner air inlet 2; 13. flame nozzle; 14. flame protection tube. DETAILED DESCRIPTION

[0019] In order to make the purpose and technical solution of the utility model clearly and completely described, and the advantages more clearly understood, the embodiments of the utility model are further described in detail in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are part of the embodiments of the utility model, not all of the embodiments, and are only used to explain the embodiments of the utility model, and are not used to limit 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.

[0020] In the description of the present utility model, it should be noted that the terms "center", "middle", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "one", "first", "second", "third", "fourth", "fifth", "sixth" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] For the purpose of simplicity and illustration, the principles of the embodiments are mainly described by reference to examples. In the following description, many specific details are proposed to provide a thorough understanding of the embodiments. However, it is obvious that for those of ordinary skill in the art, these embodiments may not be limited to these specific details in practice. In some instances, known methods and structures are not described in detail to avoid making these embodiments unnecessarily difficult to understand. In addition, all embodiments can be used in combination with each other.

[0023] See also Figure 1 to Figure 2 The utility model provides a technical solution: a hot air stove with a self-cooling function, comprising: an outer shell 1 and a support base 2, the support base 2 is fixedly mounted at the lower end of the outer shell 1 to support the outer shell 1, an inner liner 3 is arranged inside the outer shell 1, a sandwich is arranged between the outer shell 1 and the inner liner 3, the inner liner 3 is in the shape of a bucket, and a sandwich guide plate 4 is spirally arranged on the outer wall of the inner liner 3, an air outlet 5 is arranged at one end of the inner liner 3, the air outlet 5 is cylindrical, one end of the air outlet 5 is connected with the inner liner 3, the other end of the air outlet 5 is located at the outer side of the outer shell 1, and a connecting flange 6 is fixedly mounted thereon for easy connection with an external object, the outer wall of the air outlet 5 is fixedly connected to the outer shell 1 to fix the air outlet 5, an electric thermocouple 7 is fixedly mounted on the upper end of the air outlet 5 for easy temperature measurement, an air inlet 8 is fixedly mounted on the side wall at one end of the outer shell 1, the air inlet 8 is connected with the interior of the outer shell 1, the air inlet 8 is close to the air outlet 5, and air can be introduced into the sandwich between the outer shell 1 and the inner liner 3 through the air inlet 8.

[0024] The other end of the inner tank 3 is provided with a burner 10 through a flame protection tube 14. One end of the flame protection tube 14 is fixedly mounted on the inner tank 3 and communicated with the inner tank 3, and the other end passes through the outer shell 1 and is fixedly connected to the outer shell 1 to fix the flame protection tube 14. A swirl guide plate 9 is provided at the connection between the flame protection tube 14 and the inner tank 3. The upper and lower end side walls of the flame protection tube 14 are symmetrically provided with a burner air inlet 12, and the air in the interlayer through the burner air inlet 12 can enter the flame protection tube 14.

[0025] The burner 10 is fixedly mounted on the outer end of the flame protection tube 14, and the flame nozzle 13 at one end of the burner 10 passes through the flame protection tube 14 and is located in the inner tank 3 and on the inner side of the swirl guide plate 9. The swirl guide plate 9 arranged around the flame nozzle 13 in the burner 10 is arranged at an angle of 60°, so that the cold air enters the inner tank 3 in a rotating state and is fully mixed with the flame generated by the burner 10. A burner air inlet 11 is provided on the lower side of the outer end of the burner 10 to provide oxygen for the burner 10.

[0026] The cold air enters from the air inlet 8 of the hot blast furnace, and moves toward the burner 10 through the interlayer guide plate 4 arranged on the inner liner 3 at the shrinkage. The cold air cools the inner liner 3 in the process of moving toward the rear. The cold air entering the rear is divided into two parts. One part enters through the flame protection tube 14 as secondary combustion air to participate in the combustion of the burner 10, and the other part enters the combustion chamber through the swirl guide plate 9 around the burner 10. The swirl guide plate 9 arranged around the flame nozzle 13 in the burner 10 is arranged at an angle of 60°, so that the cold air enters the inner liner 3 in a rotating state and is fully mixed with the flame generated by the burner 10.

[0027] The wind speed at the burner outlet 5 reaches 150m / S, which produces an induced effect. The interlayer operates in a negative pressure state, and even if the contact point seal fails, it will not cause high-temperature wind to overflow the hot blast furnace.

[0028] The high temperature radiation generated by the combustion of the fuel heats the inner liner 3, while the cold air entering the combustion chamber continuously cools the inner liner 3 to ensure that the inner liner 3 will not be burned.

[0029] Since the burner 10 adopts oxygen-deficient combustion and performs secondary mixed combustion at the outlet, the combustion temperature is lowered while reducing NOx emissions.

[0030] The sandwich guide plate 4 not only increases the thermal conductivity between the inner liner 3 and the air, and enhances the heat exchange between the inner liner 3 and the cold air, but also increases the strength of the inner liner 3 and reduces the consumption of steel.

[0031] Due to the existence of the interlayer, when the hot air temperature is 650℃, the thickness of the outer insulation layer only needs to be 50mm to ensure that the surface temperature rise is no more than 20℃. The inner tank 3 can still maintain its original structure without deformation after a service life of 10 years. When the hot air temperature for material drying is lower than 240℃, the furnace body does not need to be insulated and the surface temperature rise does not exceed 20℃.

[0032] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hot air stove with self-cooling function, comprising: A shell (1) and a support base (2), wherein the support base (2) is fixedly mounted on the lower end of the shell (1), and is characterized in that an inner shell (3) is arranged inside the shell (1), a sandwich guide plate (4) is spirally arranged on the outer wall of the inner shell (3), an air outlet (5) is arranged at one end of the inner shell (3), and a burner (10) is installed at the other end through a flame protection tube (14); A swirl guide plate (9) is provided at the connection between the flame protection tube (14) and the inner container (3), and burner air inlet ports 2 (12) are symmetrically provided on the upper and lower end side walls of the flame protection tube (14).

2. The hot air stove with self-cooling function according to claim 1, characterized in that: The air outlet (5) is cylindrical, one end of the air outlet (5) is connected to the inner container, the other end of the air outlet (5) is located outside the outer shell (1) and is fixedly mounted with a connecting flange (6), and the outer wall of the air outlet (5) is fixedly connected to the outer shell (1).

3. The hot air stove with self-cooling function according to claim 1, characterized in that: A thermocouple (7) is fixedly mounted on the upper end of the air outlet (5).

4. The hot air stove with self-cooling function according to claim 1, characterized in that: An air inlet (8) is fixedly mounted on a side wall at one end of the housing (1); the air inlet (8) is connected to the interior of the housing (1); and the air inlet (8) is close to the air outlet (5).

5. The hot air stove with self-cooling function according to claim 1, characterized in that: One end of the flame protection tube (14) is fixedly mounted on the inner container (3) and communicates with the inner container (3), and the other end passes through the outer shell (1) and is fixedly connected to the outer shell (1).

6. The hot air stove with self-cooling function according to claim 1, characterized in that: The burner (10) is fixedly mounted on the outer end of the flame protection tube (14), and the flame nozzle (13) at one end of the burner (10) passes through the flame protection tube (14) and is located in the inner container (3).

7. The hot air stove with self-cooling function according to claim 1, characterized in that: A burner air inlet 1 (11) is provided at the lower side of the outer end of the burner (10).

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