Blast furnace gas waste heat recovery device

Abstract

The utility model discloses a blast furnace gas waste heat recovery device which comprises a dust removal tank, a gas inlet pipe extending into the dust removal tank is arranged at the top of the dust removal tank, the gas outlet direction of the gas inlet pipe is downward, a gas outlet pipe leading to the outer side is arranged at the top of the dust removal tank, and a dust falling opening is formed in the bottom of the dust removal tank. A dust collecting box is arranged at the bottom of the dust falling opening; a heat exchange bin is arranged in the dust removal tank, a breather pipe leading to the outer side of the dust removal tank is arranged on the heat exchange bin, an air blower and a heater which are communicated with the heat exchange bin are arranged on the outer side of the dust removal tank, and air outlets of the air blower and the heater lead to the blast furnace. The heat exchange bin is arranged in the dust removal tank for blast furnace gas dust removal treatment, air about to enter the blast furnace is preheated, heat energy can be recycled under the condition that the discharge speed of the blast furnace gas is not affected, and normal operation of blast furnace ironmaking is prevented from being affected.

Description

Technical Field

[0001] The utility model relates to the technical field of blast furnace ironmaking, in particular to a blast furnace gas waste heat recovery device. Background Art

[0002] Blast furnace gas (BFG) is a high-temperature gas produced during the blast furnace smelting process. Its discharge requires purification steps such as dust removal and decontamination. However, the waste heat from BFG is difficult to recover. Using this waste heat to convert thermal energy into kinetic energy would affect the gas's discharge rate, hindering its normal discharge and indirectly affecting the blast furnace's pressure, hindering ironmaking operations. Therefore, a waste heat recovery method that does not affect the gas's discharge rate is needed. Utility Model Content

[0003] The purpose of the utility model is to avoid the deficiencies of the prior art and provide a blast furnace gas waste heat recovery device, thereby effectively solving the deficiencies in the prior art.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a blast furnace gas waste heat recovery device, including a dust removal tank, the top of the dust removal tank is provided with an air inlet pipe extending to the interior of the dust removal tank, the air outlet direction of the air inlet pipe is downward, the top of the dust removal tank is provided with an air outlet pipe leading to the outside, the bottom of the dust removal tank is provided with a dust outlet, and the bottom of the dust outlet is provided with a dust collecting box; a heat exchange bin is provided in the dust removal tank, and a ventilation pipe leading to the outside of the dust removal tank is provided on the heat exchange bin, and a blower and a heater connected to the heat exchange bin are provided on the outside of the dust removal tank, and the air outlets of the blower and the heater lead to the blast furnace.

[0005] Furthermore, the heat exchange chamber is arranged in the middle of the dust removal tank, and the air inlet pipe passes through the middle of the heat exchange chamber.

[0006] Furthermore, the heat exchange chamber is spherical.

[0007] Furthermore, a plurality of ventilation pipes are radially arranged on the surface of the heat exchange chamber.

[0008] Furthermore, a dust cap is provided at the outer end of the vent pipe, and the dust cap is supported on the outer end of the vent pipe by a plurality of support rods, and the dust cap covers the vent at the outer end of the vent pipe.

[0009] Furthermore, a conical guide plate is provided at the bottom of the air inlet pipe in the dust removal tank, and a dust collection groove is provided on the edge of the guide plate.

[0010] Furthermore, the angle between the upper surface of the guide plate and the side wall of the dust removal tank is an obtuse angle.

[0011] The above-mentioned technical solution of the present invention has the following beneficial effects: the present invention sets a heat exchange chamber in the dust removal tank for blast furnace gas dust removal treatment to preheat the air about to enter the blast furnace, and can recover heat energy without affecting the discharge speed of blast furnace gas, thereby avoiding affecting the normal operation of blast furnace ironmaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a cross-sectional schematic diagram of an embodiment of the present utility model. DETAILED DESCRIPTION

[0013] The following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0014] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inside", "outside", "front end", "rear end", "head", "tail", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" 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 an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0015] like Figure 1As shown, a blast furnace gas waste heat recovery device of this embodiment includes a dust removal tank 1, an air inlet pipe 2 extending into the interior of the dust removal tank 1 is provided on the top of the dust removal tank 1, the air outlet direction of the air inlet pipe 2 is downward, an air outlet pipe 3 leading to the outside is provided on the top of the dust removal tank 1, a dust drop port 4 is provided at the bottom of the dust removal tank 1, and a dust collecting box 5 is provided at the bottom of the dust drop port 4; a heat exchange bin 6 is provided in the dust removal tank 1, a vent pipe 7 leading to the outside of the dust removal tank 1 is provided on the heat exchange bin 6, a blower 8 and a heater 9 connected to the heat exchange bin 6 are provided on the outside of the dust removal tank 1, and the air outlets of the blower 8 and the heater 9 lead to Blast furnace; blast furnace gas enters the dust removal tank 1 from the air inlet pipe 2, and after gravity dust removal in the dust removal tank 1, it flows upward along the side wall of the dust removal tank 1, and then is discharged to the purification device of the next step through the air outlet pipe 3. During this period, the blower 8 will continue to inhale air through the heat exchange bin 6 and the vent pipe 7, and the outside air will continue to pass through the heat exchange bin 6. The contact between the blast furnace gas and the heat exchange bin 6 will continuously transfer heat to the air in the heat exchange bin 6, thereby preheating the air about to enter the blast furnace. Heat energy can be recovered without affecting the discharge speed of the blast furnace gas, thereby avoiding affecting the normal operation of the blast furnace ironmaking;

[0016] Preferably, the heat exchange bin 6 is arranged in the middle of the dust removal tank 1, and the air inlet pipe 2 passes through the middle of the heat exchange bin 6; while the blast furnace exhaust gas enters the dust removal tank 1 through the air inlet pipe 2, it can also exchange heat with the air in the heat exchange bin 6, thereby improving the heat exchange efficiency;

[0017] Preferably, the heat exchange bin 6 is spherical. The spherical heat exchange bin 6 has a larger surface area, which can increase the contact area between the blast furnace gas and the heat exchange bin 6.

[0018] Preferably, multiple vent pipes 7 are radially arranged on the surface of the heat exchange bin 6. The diameter of the vent pipes 7 is relatively thin. Arranging multiple vent pipes 7 can not only ensure that sufficient air enters the heat exchange bin 6, but also increase the heat exchange area between the air and the blast furnace gas, thereby further improving the heat exchange efficiency.

[0019] Preferably, a dust cap 10 is provided at the outer end of the vent pipe 7. The dust cap 10 is supported on the outer end of the vent pipe 7 by a plurality of support rods. The dust cap 10 covers the vent opening at the outer end of the vent pipe 7. The dust cap 10 can prevent foreign particles from falling into the vent pipe 7.

[0020] Preferably, a conical guide plate 11 is provided at the bottom of the air inlet pipe 2 in the dust removal tank 1, and a dust collection groove 12 is provided on the edge of the guide plate 11; the blast furnace gas flowing out of the air inlet pipe 2 will flow directly to the guide plate 11, then flow to the surrounding area under the guidance of the guide plate 11, and then flow upward along the bottom of the dust removal tank 1 to be discharged, during which part of the dust may fall on the guide plate 11, and then fall into the dust collecting box 5 at the bottom through the dust collection groove 12;

[0021] Preferably, the angle between the upper surface of the guide plate 11 and the side wall of the dust removal tank 1 is an obtuse angle. After the blast furnace gas is guided by the guide plate 11, it can flow upward along the dust removal tank 1. The angle between the upper surface of the guide plate 11 and the side wall of the dust removal tank 1 is an obtuse angle, which can reduce the gas from flowing downward through the dust collection trough 12.

[0022] The embodiments of the present invention are provided for purposes of illustration and description and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for specific applications.

Claims

1. A blast furnace gas waste heat recovery device, characterized by: It includes a dust removal tank, the top of the dust removal tank is provided with an air inlet pipe extending to the interior of the dust removal tank, the air outlet direction of the air inlet pipe is downward, the top of the dust removal tank is provided with an air outlet pipe leading to the outside, the bottom of the dust removal tank is provided with a dust collection port, and the bottom of the dust collection port is provided with a dust collecting box; a heat exchange bin is provided in the dust removal tank, and a ventilation pipe leading to the outside of the dust removal tank is provided on the heat exchange bin, and a blower and a heater connected to the heat exchange bin are provided on the outside of the dust removal tank, and the air outlets of the blower and the heater lead to the blast furnace.

2. The blast furnace gas waste heat recovery device according to claim 1, characterized in that: The heat exchange chamber is arranged in the middle of the dust removal tank, and the air inlet pipe passes through the middle of the heat exchange chamber.

3. The blast furnace gas waste heat recovery device according to claim 1, characterized in that: The heat exchange chamber is spherical.

4. The blast furnace gas waste heat recovery device according to claim 1, characterized in that: A plurality of ventilation pipes are radially arranged on the surface of the heat exchange chamber.

5. The blast furnace gas waste heat recovery device according to claim 1, characterized in that: The outer end of the vent pipe is provided with a dustproof cap, which is supported on the outer end of the vent pipe by a plurality of support rods, and the dustproof cap covers the vent at the outer end of the vent pipe.

6. The blast furnace gas waste heat recovery device according to claim 1, characterized in that: A conical guide plate is provided at the bottom of the air inlet pipe in the dust removal tank, and a dust collection groove is provided at the edge of the guide plate.

7. The blast furnace gas waste heat recovery device according to claim 6, characterized in that: The angle between the upper surface of the guide plate and the side wall of the dust removal tank is an obtuse angle.

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