Metallurgical furnace flue gas waste heat utilization device

Abstract

The utility model discloses a metallurgical furnace flue gas waste heat utilization device, which relates to the technical field of non-ferrous metallurgical equipment and comprises a metallurgical furnace flue, a sleeve is fixedly sleeved on the outer side of the metallurgical furnace flue, and the outer wall of the sleeve is fixedly communicated with a normal temperature air inlet and a heated air outlet. A heat exchange guide sheet is fixedly connected between the metallurgical furnace flue and the sleeve, and specifically, the heat exchange guide sheet is a spiral auger-shaped guide sheet; according to the flue gas waste heat utilization device for the metallurgical furnace, waste heat in flue gas can be more effectively utilized, the heat exchange efficiency between air and the flue gas is enhanced through the spiral structure of the heat exchange guide sheets, meanwhile, the uniformity and efficiency of heat exchange are further improved through the design of reverse flowing, and therefore the utilization rate of energy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of nonferrous metallurgical equipment, and more specifically to a device for utilizing waste heat from flue gas of a metallurgical furnace. Background Art

[0002] Metallurgical furnaces produce a large amount of high-temperature flue gas during the smelting process. When the flue gas temperature is higher than 400°C, it has recycling value. Generally, the heat carried away by the flue gas accounts for 10%-60% of the total heat, so effectively recovering the waste heat of the flue gas is an important way to save energy and reduce consumption.

[0003] The exhaust temperature of the flue of metallurgical furnaces is about 800℃-1000℃, and sometimes even reaches 1100℃. However, in the existing process of exhausting the flue of metallurgical furnaces, the way to utilize waste heat is generally to pass the flue gas into a heat exchange boiler for heat exchange. However, the flue gas also needs to pass through the flue, so the surface heat of the flue has the problem of low utilization rate of waste heat resources. Utility Model Content

[0004] The purpose of the utility model is: in order to solve the above technical problems, the utility model provides a metallurgical furnace flue gas waste heat utilization device, which can recover and utilize the heat of the flue outer wall, thereby achieving the effect of energy saving and consumption reduction.

[0005] In order to achieve the above-mentioned purpose, the utility model specifically adopts the following technical scheme: a device for utilizing waste heat of flue gas from a metallurgical furnace, comprising a flue of a metallurgical furnace, a sleeve is fixedly mounted on the outer side of the flue of the metallurgical furnace, a normal temperature air inlet and a heated air outlet are fixedly connected to the outer wall of the sleeve, and a heat exchange guide plate is fixedly connected between the flue of the metallurgical furnace and the sleeve.

[0006] Preferably, both ends of the sleeve are closed.

[0007] Preferably, the heat exchange guide vane is a spiral dragon-shaped guide vane.

[0008] Preferably, the heat exchange guide plate separates the interlayer between the metallurgical furnace flue and the sleeve into a spiral cavity, and the normal temperature air inlet and the heated air outlet are both connected to the spiral cavity.

[0009] Preferably, the width of the interlayer between the metallurgical furnace flue and the sleeve is a, and a is smaller than the inner diameter of the metallurgical furnace flue.

[0010] Preferably, the flue gas in the flue of the metallurgical furnace and the air in the spiral cavity flow in opposite directions.

[0011] The beneficial effects of the utility model are as follows:

[0012] 1. Normal temperature air enters the sleeve through the normal temperature air inlet, and the heat exchange guide plate ensures the air flow direction. The normal temperature air passes through the entire sleeve and is finally discharged through the heated air outlet, thereby completing the heat exchange of flue gas waste heat;

[0013] 2. By setting a spiral heat exchange guide plate, the flow direction of the air in the sleeve can be ensured. At the same time, the heat exchange path of the normal temperature air is increased, the contact area between the normal temperature air and the flue wall of the metallurgical furnace is increased, and the air heat exchange time is extended, thereby enhancing the heat exchange efficiency between the air and the flue gas;

[0014] 3. By setting the interlayer width between the metallurgical furnace flue and the sleeve to be smaller and the design that the air and the flue gas flow in opposite directions, the uniformity and efficiency of heat exchange can be further improved, thereby improving the utilization rate of energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the internal structure of the utility model;

[0016] Figure 2 It is a cross-sectional view of the utility model.

[0017] Figure numerals: 1. Metallurgical furnace flue; 2. Sleeve; 201. Normal temperature air inlet; 202. Heating air outlet; 203. Spiral cavity; 3. Heat exchange guide plate. DETAILED DESCRIPTION

[0018] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0019] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "inside" and "outside" etc. indicating directions or positional relationships are 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, rather than indicating or implying 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.

[0020] See also Figure 1-2 The utility model provides the following technical solutions: a device for utilizing waste heat from flue gas of a metallurgical furnace, comprising a metallurgical furnace flue 1, a sleeve 2 being fixedly sleeved on the outer side of the metallurgical furnace flue 1, both ends of the sleeve 2 being closed, a normal temperature air inlet 201 and a heated air outlet 202 being fixedly connected to the outer wall of the sleeve 2, and a heat exchange guide plate 3 being fixedly connected between the metallurgical furnace flue 1 and the sleeve 2.

[0021] In this embodiment: the flue gas generated during the operation of the metallurgical furnace is discharged through the flue. When the flue gas is in the flue 1 of the metallurgical furnace, the heat is transferred to the sleeve 2 through the flue wall. Normal temperature air enters the sleeve 2 through the normal temperature air inlet 201. The air flow direction is ensured by the heat exchange guide plate 3. The normal temperature air passes through the entire sleeve 2 and is finally discharged through the heated air outlet 202, thereby completing the heat exchange of the flue gas waste heat.

[0022] As a technical optimization solution of the utility model, the heat exchange guide plate 3 is specifically a spiral dragon-shaped guide plate, and the heat exchange guide plate 3 separates the interlayer between the metallurgical furnace flue 1 and the sleeve 2 into a spiral cavity 203, and the normal temperature air inlet 201 and the heated air outlet 202 are both connected to the spiral cavity 203.

[0023] In this embodiment: by providing a spiral heat exchange guide plate 3, the flow direction of the air in the sleeve 2 can be ensured. At the same time, the heat exchange path of the normal temperature air is increased, the contact area between the normal temperature air and the wall of the metallurgical furnace flue 1 is increased, and the air heat exchange time is extended, thereby enhancing the heat exchange efficiency between the air and the flue gas.

[0024] As a technical optimization solution of the utility model, the width of the interlayer between the metallurgical furnace flue 1 and the sleeve 2 is a, and a is smaller than the inner diameter of the metallurgical furnace flue 1. The flue gas in the metallurgical furnace flue 1 flows in the opposite direction to the air in the spiral cavity 203.

[0025] In this embodiment, by setting the interlayer width between the metallurgical furnace flue 1 and the sleeve 2 to be smaller and the design that the air and the flue gas flow in opposite directions, the uniformity and efficiency of heat exchange can be further improved, thereby improving the utilization rate of energy.

[0026] The working principle and use process of the utility model are as follows: a flue gas waste heat utilization device is installed on the outside of the flue 1 of the metallurgical furnace, and the device can exchange heat between high-temperature flue gas and normal-temperature air. High-temperature flue gas enters from the right side of the flue, while normal-temperature air enters from the top of the sleeve 2. A spiral guide plate is provided in the sleeve to ensure the direction of air flow. After heat exchange, the normal-temperature air is heated to 100°C-250°C and can be directly used for winter heating or other occasions requiring a heat source. In order to improve the efficiency of heat utilization, countercurrent heat exchange is adopted for preheating air. After using this device, the comprehensive energy consumption of the metallurgical furnace can be reduced by about 30%, and fuel costs can be saved by about 1 million yuan per year. The design concept of the device is to recover and utilize the heat in the high-temperature flue gas generated by the metallurgical furnace through effective heat exchange technology, thereby achieving the effect of energy saving and emission reduction.

[0027] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A device for utilizing waste heat from flue gas of a metallurgical furnace, comprising a flue of a metallurgical furnace (1), characterized in that: A sleeve (2) is fixedly mounted on the outer side of the metallurgical furnace flue (1); a normal temperature air inlet (201) and a heated air outlet (202) are fixedly connected to the outer wall of the sleeve (2); and a heat exchange guide plate (3) is fixedly connected between the metallurgical furnace flue (1) and the sleeve (2).

2. The device for utilizing waste heat from flue gas of a metallurgical furnace according to claim 1, characterized in that: Both ends of the sleeve (2) are closed.

3. The device for utilizing waste heat from flue gas of a metallurgical furnace according to claim 1, characterized in that: The heat exchange guide blade (3) is specifically a spiral dragon-shaped guide blade.

4. The device for utilizing waste heat from flue gas of a metallurgical furnace according to claim 1, characterized in that: The heat exchange guide plate (3) separates the interlayer between the metallurgical furnace flue (1) and the sleeve (2) into a spiral cavity (203), and the normal temperature air inlet (201) and the heated air outlet (202) are both connected to the spiral cavity (203).

5. The device for utilizing waste heat from flue gas of a metallurgical furnace according to claim 1, characterized in that: The width of the interlayer between the metallurgical furnace flue (1) and the sleeve (2) is a, and a is smaller than the inner diameter of the metallurgical furnace flue (1).

6. The device for utilizing waste heat from flue gas of a metallurgical furnace according to claim 1, characterized in that: The flue gas in the metallurgical furnace flue (1) and the air in the spiral cavity (203) flow in opposite directions.

Images