Air-cooled smoke hood for three-stage waste heat recovery of smoke of anode furnace

Abstract

The utility model relates to the technical field of anode furnace smoke hoods, in particular to an air cooling smoke hood for anode furnace smoke three-level waste heat recovery. The air cooling smoke hood comprises three anode furnaces which are arranged in parallel, the top of each anode furnace is provided with a collecting smoke hood, the top of each collecting smoke hood is connected with a heat exchange smoke hood, and the rear end of each heat exchange smoke hood is connected with a smoke exhaust pipe. The air cooling flue sequentially penetrates through all the heat exchange smoke hoods from the side direction; through the arrangement, cooling of smoke of the anode furnace and recycling of waste heat can be achieved, and a stable heat source is provided.

Description

Technical Field

[0001] The utility model relates to an air-cooled smoke hood for three-stage waste heat recovery of anode furnace flue gas, belonging to the technical field of anode furnace smoke hoods. Background Art

[0002] The refining process of copper smelting mainly conducts the refining of blister copper. The core equipment is a rotary anode furnace and its auxiliary system. The refining operation is mainly divided into four operation stages: feeding, oxidation, reduction, and casting. The rotary anode furnace is heated by natural gas combustion through a combustion system to achieve the heat preservation and temperature rise of the copper melt. In the oxidation stage, compressed air is introduced under the melt for desulfurization and impurity removal. In the reduction stage, natural gas is introduced for deoxidation. The flue gas is collected through a smoke hood, and after passing through a flue gas pipeline to a plate-type flue gas cooler and a bag filter for further temperature reduction and dust removal, it enters the ring-collected flue gas treatment or acid-making system for treatment.

[0003] The temperature of the flue gas inside the smoke hood is generally between 300 - 800 °C. When the flue gas temperature is high in the reduction stage, the flue gas is cooled by blowing dilution air from the side end of the smoke hood, and the outlet flue gas temperature is reduced to about 300 - 600 °C to ensure the structural and process safety of the subsequent flue gas pipeline and bag filter. However, a large amount of waste heat in the flue gas is not utilized, and the injection of cold air increases the additional flue gas volume. The amount of injected cold air needs to be limited, otherwise the subsequent flue gas treatment will be out of control.

[0004] Therefore, it is necessary to develop a device for auxiliary temperature reduction and waste heat recovery inside the anode furnace smoke hood. Content of the Utility Model

[0005] In order to solve the above problems existing in the prior art, the utility model provides an air-cooled smoke hood for three-stage waste heat recovery of anode furnace flue gas.

[0006] The technical solution of the utility model is as follows:

[0007] An air-cooled smoke hood for three-stage waste heat recovery of anode furnace flue gas includes three anode furnaces arranged in parallel. A collecting smoke hood is provided at the top of each anode furnace. The top of the collecting smoke hood is connected with a heat exchange smoke hood, and the rear end of the heat exchange smoke hood is connected with an exhaust pipe; it also includes an air-cooled flue, and the air-cooled flue sequentially penetrates through each heat exchange smoke hood from the side.

[0008] Wherein, a smoke collecting cavity is arranged on each of the left and right sides of the inner cavity of the heat exchange smoke hood. A plurality of heat exchange smoke pipes distributed in parallel are communicated between the two smoke collecting cavities on both sides, and the heat exchange smoke hood is connected in series to the air-cooled flue through the smoke collecting cavities on both sides.

[0009] Wherein, the heat exchange smoke pipe is of a flat pipe structure, and its cross-section is an elliptical or rectangular structure.

[0010] Among them, flange structures that match each other are provided at the upper end of the converging smoke hood and the lower end of the heat exchange smoke hood, and the two are installed by flange docking.

[0011] Among them, the heat exchange smoke hood body is welded by steel structures, and a ramming material layer is coated on its inner wall.

[0012] The utility model has the following beneficial effects:

[0013] 1. The air-cooled smoke hood for the three-stage waste heat recovery of anode furnace flue gas of the utility model uses an air-cooled flue to exchange heat between cold air and the hot flue gas in the heat exchange smoke hood to cool down the hot flue gas. Compared with the traditional operation method of directly mixing cold air into the hot flue gas, the utility model does not change the original concentration and volume of the flue gas and does not affect the subsequent flue gas treatment.

[0014] 2. The air-cooled smoke hood for the three-stage waste heat recovery of anode furnace flue gas of the utility model uses an air-cooled flue to exchange heat between cold air and the hot flue gas in the heat exchange smoke hood to cool down the hot flue gas. The cold air after heat exchange recovers the heat energy of the hot flue gas and forms hot air at 100-200°C, which can be used to replace part of the heat supply methods such as natural gas, steam, and electric heating, and can be used for drying and baking wet materials, thus achieving the purpose of energy conservation and consumption reduction.

[0015] 3. The air-cooled smoke hood for the three-stage waste heat recovery of anode furnace flue gas of the utility model uses an air-cooled flue to exchange heat between cold air and the hot flue gas in the heat exchange smoke hood. The air-cooled flue sequentially penetrates the heat exchange smoke hoods of three anode furnaces from the side and absorbs the heat energy of each anode furnace step by step. Even if one of the anode furnaces is in a shutdown state, the air-cooled flue can still continuously output hot gas to ensure the continuity and stability of the recovered heat energy. Description of the Drawings

[0016] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 is a schematic diagram of the internal structure of the heat exchange smoke hood of the utility model.

[0018] The reference numerals in the drawings are shown as:

[0019] 10 - Anode furnace, 20 - Converging smoke hood, 30 - Heat exchange smoke hood, 31 - Smoke collecting cavity, 32 - Heat exchange smoke pipe, 40 - Exhaust pipe, 50 - Air-cooled flue. Detailed Embodiment

[0020] The following will combine the drawings and specific embodiments to elaborate on the utility model in detail.

[0021] See Figure 1-2, An air-cooled smoke hood 30 for three-stage waste heat recovery of anode furnace flue gas, which includes three anode furnaces 10 arranged in parallel. A collecting smoke hood 20 is provided at the top of each anode furnace 10. Since it needs to rotate during operation, the collecting smoke hood 20 is rotatably and tightly connected to the top of the anode furnace 10. The top of the collecting smoke hood 20 is connected to a heat exchange smoke hood 30. For the convenience of disassembly and assembly during maintenance, flange structures that match each other are provided at the upper end of the collecting smoke hood 20 and the lower end of the heat exchange smoke hood 30, and the two are installed by flange docking; a smoke exhaust pipe 40 is connected to the rear end of the heat exchange smoke hood 30. The flue gas discharged from the anode furnace 10 finally enters the next flue gas treatment process through the smoke exhaust pipe 40;

[0022] The solution further includes an air-cooled flue 50. The air-cooled flue 50 sequentially penetrates through each heat exchange smoke hood 30 from the side. Specifically, a smoke collecting cavity 31 is provided on each of the left and right sides of the inner cavity of the heat exchange smoke hood 30. A number of heat exchange smoke pipes 32 distributed in parallel are connected between the two side smoke collecting cavities 31. The heat exchange smoke hood 30 is connected in series to the air-cooled flue 50 through the two side smoke collecting cavities 31. During operation, the cold air flow enters the smoke collecting cavity 31 on one side of the heat exchange smoke hood 30 from one end of the air-cooled flue 50, then flows through each heat exchange smoke pipe 32 to the smoke collecting cavity 31 on the other side, and then is discharged from the smoke collecting cavity 31 on the other side and flows into the heat exchange smoke hood 30 of the next anode furnace 10; the cold air flow exchanges heat with the hot flue gas in the heat exchange smoke hood 30 when it is in the heat exchange smoke pipe 32; the design of the two side smoke collecting cavities 31 mainly plays a role in shunting and collecting, evenly shunting the heat exchange air flow input into the heat exchange smoke hood 30 to each heat exchange smoke hood 30, and then collecting and discharging the heat exchange air flow discharged from each heat exchange smoke hood 30;

[0023] As a further embodiment, in order to increase the heat exchange efficiency, the heat exchange smoke pipe 32 is of a flat tube structure, and its cross-section is an elliptical or rectangular structure, which improves the heat exchange efficiency by increasing the heat exchange contact surface;

[0024] As a further embodiment, the body of the heat exchange smoke hood 30 is welded by steel structure, and a ramming material layer is coated on its inner wall to prevent the high-temperature flue gas at the smoke outlet of the anode furnace 10 from burning out the smoke hood.

[0025] The working principle of the present utility model:

[0026] As Figure 1-2 shown, the anode furnace 10 collects the anode furnace flue gas through the collecting smoke hood 20 and the heat exchange smoke hood 30, and discharges it into the rear smoke exhaust pipe 40;

[0027] First, a fan is used to drive air flow through the air-cooled flue 50 to blow cold air into the smoke collection chamber 31 on one side of the heat exchange smoke hood 30 above the first anode furnace 10. The cold air enters each heat exchange smoke tube 32 through distribution in the smoke collection chamber 31. The cold air in the heat exchange smoke tube 32 is initially heated, and at the same time, partial cooling of the flue gas of the first anode furnace 10 is achieved. After the cooling air flow converges to the smoke collection chamber 31 on the other side, it enters the smoke collection chamber 31 at the inlet side of the heat exchange smoke hood 30 above the next anode furnace 10 through the air-cooled flue 50; the cold air initially heated by the first heat exchange smoke hood 30 enters the smoke collection chamber 31 of the heat exchange smoke hood 30 of the second anode furnace, enters the heat exchange smoke tube 32 through distribution in the smoke collection chamber 31, and the cooling air flow is heated a second time through the heat exchange smoke tube 32. At the same time, partial cooling of the flue gas of the second anode furnace 10 is achieved. After converging to the smoke collection chamber 31 on the other side, it enters the smoke collection chamber 31 at the inlet side of the heat exchange smoke hood 30 of the third heat exchange smoke hood 30 through the air-cooled flue 50 pipe; after being redistributed through the smoke collection chamber 31 and entering the heat exchange smoke tube 32, the cooling air flow is heated or kept warm three times through the heat exchange smoke tube 32. At the same time, partial cooling of the flue gas of the third anode furnace is achieved. After converging to the smoke collection chamber 31 on the other side, it is discharged through the air-cooled flue 50, thus realizing three-stage waste heat recovery. No matter what operating state the three anode furnaces are in, at least one anode furnace has high-temperature flue gas, so as to provide stable hot air for the backend.

[0028] Through the above settings, the cooling and waste heat recovery and utilization of the anode furnace flue gas can be realized, and a stable heat source can be provided.

[0029] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied to other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. An air-cooled hood for three-stage waste heat recovery of anode furnace flue gas, characterized in that: The invention comprises three anode furnaces (10) arranged in parallel, each of the anode furnaces (10) being provided with a collecting smoke hood (20) on the top, the top of the collecting smoke hood (20) being connected to a heat exchange smoke hood (30), the rear end of the heat exchange smoke hood (30) being connected to a smoke exhaust pipe (40); and also comprises an air cooling flue (50), the air cooling flue (50) passing through each of the heat exchange smoke hoods (30) in sequence from the side.

2. The air-cooled hood for three-stage waste heat recovery of anode furnace flue gas as claimed in claim 1, characterized in that: A smoke collecting chamber (31) is provided on each of the left and right sides of the inner cavity of the heat exchange smoke hood (30), and a plurality of heat exchange smoke pipes (32) distributed in parallel are provided in communication between the smoke collecting chambers (31) on both sides. The heat exchange smoke hood (30) is connected in series to the air-cooling flue (50) via the smoke collecting chambers (31) on both sides.

3. The air-cooled hood for three-stage waste heat recovery of anode furnace flue gas as claimed in claim 2, characterized in that: The heat exchange smoke tube (32) is a flat tube structure, and its cross section is an elliptical or rectangular structure.

4. The air-cooled hood for three-stage waste heat recovery of anode furnace flue gas according to claim 1, characterized in that: The upper end of the collecting hood (20) and the lower end of the heat exchange hood (30) are both provided with flange structures that match each other, and the two are butt-jointed and installed via flanges.

5. The air-cooled hood for three-stage waste heat recovery of anode furnace flue gas as claimed in claim 1, characterized in that: The heat exchange fume hood (30) body is formed by welding a steel structure, and the inner wall thereof is coated with a ramming material layer.

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