Copper smelting furnace waste heat recovery device

Abstract

The utility model discloses a copper smelting furnace waste heat recovery device relates to waste heat recovery, apply to copper smelting furnace waste heat recovery, including heat exchange pipe, it includes the U -shaped pipe body of symmetrical distribution, and the first end and the second end of two U -shaped pipe body are provided with spiral pipe between, and the fin of equidistance distribution is fixedly arranged on two spiral pipes. The utility model discloses the combination design of spiral pipe and fin, optimizes the flue gas flow field while strengthening the heat exchange, realizes the dual -purpose promotion of waste heat recovery efficiency and operating stability.

Description

Technical Field

[0001] This utility model relates to waste heat recovery, specifically a waste heat recovery device for a copper smelting furnace. Background Technology

[0002] Copper smelting is a typical high-energy-consuming process, generating a large amount of high-temperature flue gas in key steps such as smelting and blowing. The waste heat carried by this flue gas is of significant value. Effectively recovering and utilizing this waste heat is of great importance for reducing the overall energy consumption of the smelting process, reducing production costs, improving energy efficiency, and achieving green and low-carbon production.

[0003] Currently, the industry commonly uses waste heat boilers or various heat exchangers to recover waste heat from smelting furnace flue gas. Common heat exchange devices often employ straight tube, serpentine tube, or simple U-shaped tube bundle structures. While these traditional structures can achieve basic heat exchange functions, they still have some shortcomings when applied to specific scenarios of copper smelting flue gas waste heat recovery: Firstly, when flue gas flows through the heat exchange tube bundle, the flow field distribution may be uneven, easily forming flow "dead zones" or short circuits, resulting in some heat exchange surfaces not fully participating in heat exchange, leaving room for improvement in overall heat exchange efficiency; secondly, traditional tube bundle layouts and surface structures have limited ability to tamper with flue gas, resulting in thicker boundary layers and higher heat transfer resistance. Furthermore, some complex heat exchangers also suffer from problems such as inconvenient ash cleaning, easy local wear or blockage, and high manufacturing and maintenance costs. Utility Model Content

[0004] The purpose of this invention is to provide a waste heat recovery device for copper smelting furnaces to address the aforementioned shortcomings in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a waste heat recovery device for copper smelting furnaces, applied to waste heat recovery in copper smelting furnaces, including heat exchange tubes, each comprising symmetrically distributed U-shaped tubes, and a spiral tube is provided between the first and second ends of the two U-shaped tubes, with fins evenly distributed fixedly arranged on both spiral tubes.

[0006] Preferably, the fins have a circular structure.

[0007] Preferably, the multiple fins on the two spiral tubes are staggered.

[0008] Preferably, the device also includes a rectangular chamber, wherein there are multiple heat exchange tubes arranged in a rectangular array inside the rectangular chamber, while U-shaped tubes are located on the outside of the rectangular chamber and are inserted and fixed in mounting holes opened on the rectangular chamber.

[0009] Preferably, the U-shaped tube is arranged at an angle, and the minimum included angle with respect to the horizontal plane is 45°-65°.

[0010] Preferably, multiple heat exchange tubes are connected in series to form a heat exchange channel. The rectangular chamber is fixedly equipped with an inlet pipe and an outlet pipe. The inlet pipe is fixedly connected to the inlet of the heat exchange channel, and the outlet pipe is fixedly connected to the outlet of the heat exchange channel.

[0011] Preferably, an upper conical air vent is fixedly installed at one end of the rectangular cabin, and a lower conical air vent is fixedly installed at the other end, with the water inlet pipe distributed near the lower conical air vent.

[0012] Preferably, the upper conical air vent is provided with multiple heat-conducting plates arranged in a matrix.

[0013] Preferably, the heat-conducting plate has a V-shaped cross-section, with fixed points facing the lower conical air vent, and a predetermined distance is maintained between two adjacent vertically arranged heat-conducting plates to form a flue gas guide channel.

[0014] In the above technical solution, the waste heat recovery device for copper smelting furnace provided by this utility model has the following beneficial effects:

[0015] 1. The symmetrically distributed U-shaped tube and spiral tube combination structure ensures a more uniform distribution of the high-temperature flue gas flow field within the device, reducing flow dead zones and short-circuit phenomena, and ensuring full utilization of all heat exchange surfaces. Furthermore, the spiral tube itself and its fins significantly increase the total heat exchange area. The spiral structure effectively disturbs the flue gas, disrupting its thermal boundary layer, while the fins further enhance turbulence, thereby greatly strengthening the heat transfer process and comprehensively improving waste heat recovery efficiency.

[0016] 2. The fins are fixed equidistantly on the spiral tube, forming a regular and unobstructed flue gas passage. This not only helps guide the flue gas flow and reduce dead zones for ash accumulation, but also facilitates mechanical vibration and purging operations when ash removal is required. The spiral tube section is relatively independent, making it easy to inspect and perform localized maintenance, thus reducing the difficulty and cost of maintenance work. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 A schematic diagram of the overall structure provided for an embodiment of this utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the heat exchange tube and rectangular chamber provided in an embodiment of the present utility model;

[0020] Figure 3 A schematic diagram of the structure of the spiral tube and fins provided in the embodiments of this utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the heat exchange tube provided in an embodiment of the present utility model;

[0022] Figure 5 This is a schematic diagram of the rectangular chamber and heat exchange tubes provided in an embodiment of the present invention.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. U-shaped tube body; 2. Spiral tube; 3. Fins; 4. Rectangular compartment; 41. Water inlet pipe; 42. Water outlet pipe; 43. Upper conical air guide; 431. Heat conduction plate; 44. Lower conical air guide; 100. Flue gas guide channel. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0026] Example 1

[0027] like Figure 1 and Figure 2 As shown, this embodiment provides a core heat exchange unit for a copper smelting furnace waste heat recovery device. The core of this device lies in its unique heat exchange tube structure. The aforementioned heat exchange tube mainly comprises two symmetrically distributed U-shaped tubes 1. These two U-shaped tubes 1 do not operate independently, but rather form a continuous fluid channel through the connection between their first and second ends. Specifically, a spiral tube 2 is respectively arranged between the corresponding ports of the two U-shaped tubes 1. That is, one spiral tube 2 connects one pair of ports (such as the first end) of the two U-shaped tubes 1, and the other spiral tube 2 connects to the other pair of ports (such as the second end), thereby forming a closed, approximately "U"-shaped loop with a spiral segment.

[0028] To further enhance heat exchange, fins 3 are fixedly installed on both spiral tubes 2. These fins 3 are equidistantly distributed along the axial direction of the spiral tubes 2, thereby significantly increasing the effective contact area between the heat exchange tubes and the high-temperature flue gas. The shape of the fins 3 can be varied. For example, in a preferred embodiment, the fins 3 can adopt a circular structure, which is easy to process and can provide a uniform and expanded heat exchange surface.

[0029] Working principle:

[0030] During operation, the cooling medium (such as water) flows in from one side of the U-shaped tube 1, sequentially through a spiral tube 2, another U-shaped tube 1, and a second spiral tube 2 before exiting. Simultaneously, high-temperature flue gas laterally washes over the entire heat exchange tube bundle. The symmetrical arrangement of the U-shaped tubes 1 provides stable structural support and a smooth medium flow path. The key innovation lies in the spiral tubes 2 and their fins 3: First, the spiral structure itself increases the effective length and heat exchange area of ​​the tube; second, the spiral shape continuously disturbs the flue gas flowing over its outer surface, disrupting its thermal boundary layer and enhancing convective heat transfer; finally, the equidistantly distributed fins 3 further greatly expand the heat exchange area and intensify the turbulence of the flue gas. These three factors combined result in a significant improvement in heat exchange efficiency. Furthermore, the regular fin distribution forms an orderly flue gas channel, helping to reduce dead zones for ash accumulation and facilitating subsequent cleaning and maintenance.

[0031] Example 2

[0032] Based on Example 1, referring to Figures 3 to 5 This example also includes a rectangular chamber 4, which constitutes the main outer shell of the recovery device. Multiple heat exchange tubes, as in Embodiment 1, are arranged in a regular rectangular array. Figure 2 The U-shaped tubes 1 are distributed inside the rectangular compartment 4. The two ends (i.e., the inlet and outlet ends) of the U-shaped tube 1 are located on the outside of the rectangular compartment 4. They are inserted into and fixed in the pre-drilled mounting holes on the side wall of the compartment 4 to achieve sealing and support.

[0033] To optimize structural strength and media flow, all U-shaped tubes 1 of the heat exchange tubes are installed at an angle. The central axis of the U-shaped tube 1 forms an angle with the horizontal plane, with a minimum value between 45° and 65°. This inclined design is beneficial to the overall load-bearing capacity and stress distribution of the device, and also conforms to the natural flow trend of the cooling medium under gravity.

[0034] Multiple independent heat exchange tubes need to be connected in series to form a continuous heat exchange channel. Specifically, the outlet of one heat exchange tube is connected to the inlet of the next heat exchange tube via a pipe, thus forming a series loop. A main water inlet pipe 41 and a water outlet pipe 42 are fixedly installed on the rectangular chamber 4. The water inlet pipe 41 is fixedly connected to the starting water inlet of the entire series heat exchange channel, while the water outlet pipe 42 is fixedly connected to the final water outlet of the channel. This allows the cooling medium to flow sequentially through all heat exchange tubes, fully absorbing heat.

[0035] To further guide and evenly distribute the high-temperature flue gas, upper conical air guides 43 and lower conical air guides 44 are fixedly installed at both ends of the rectangular chamber 4 along the flue gas flow direction. The flue gas enters from the larger inlet end (lower conical air guide 44), undergoes heat exchange through the heat exchange tube bundle, and exits from the smaller outlet end (upper conical air guide 43). The conical structure helps to uniformize the flue gas velocity before entering the core heat exchange zone, avoiding localized high-speed scouring or low-speed stagnation zones. In an optimized design, the water inlet pipe 41 can be arranged near the lower conical air guide 44 (i.e., the flue gas inlet end). This allows the cooling medium to flow in roughly opposite directions to the flue gas, which helps to improve the overall heat transfer temperature difference, thereby further enhancing waste heat recovery efficiency.

[0036] This embodiment achieves an integrated arrangement of multiple heat exchange tubes through a rectangular chamber 4, resulting in a compact structure that facilitates overall installation and maintenance. The series flow channels and inclined arrangement optimize thermal and hydraulic performance, while the conical air guide improves the uniformity of the flue gas flow field, making the overall operation of the device more stable and efficient.

[0037] Example 3

[0038] Based on Example 2, this embodiment features a more refined and optimized design for flue gas guidance and ash prevention.

[0039] like Figure 5 As shown, the upper conical air vent 43 has been structurally reinforced in this embodiment. Multiple heat-conducting plates 431 arranged in a matrix (i.e., row-column aligned) are disposed on the inner side of the upper conical air vent 43. These heat-conducting plates 431 serve multiple functions.

[0040] The heat-conducting plate 431 has a V-shaped cross-section. Its installation direction has specific requirements: the apex (i.e., the tip) of the V-shape faces the direction of flue gas flow, that is, it points downwards towards the conical air inlets 44. Simultaneously, a predetermined, uniform spacing is maintained between multiple heat-conducting plates 431 in two adjacent vertical rows (along the flue gas flow direction), thus forming a regular flue gas guide channel 100 between them.

[0041] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A waste heat recovery device for copper smelting furnaces, used for waste heat recovery in copper smelting furnaces, characterized in that, It includes heat exchange tubes, which include symmetrically distributed U-shaped tube bodies (1), and a spiral tube (2) is provided between the first and second ends of the two U-shaped tube bodies (1), and equidistant fins (3) are fixedly provided on the two spiral tubes (2).

2. The waste heat recovery device for a copper smelting furnace according to claim 1, characterized in that, The fin (3) has a circular structure.

3. The waste heat recovery device for a copper smelting furnace according to claim 1, characterized in that, Multiple fins (3) on the two spiral tubes (2) are staggered.

4. The waste heat recovery device for a copper smelting furnace according to claim 1, characterized in that, It also includes a rectangular chamber (4), the number of heat exchange tubes is multiple and they are distributed in a rectangular array inside the rectangular chamber (4), while the U-shaped tube (1) is located on the outside of the rectangular chamber (4) and is inserted and fixed in the mounting hole opened on the rectangular chamber (4).

5. The waste heat recovery device for a copper smelting furnace according to claim 4, characterized in that, The U-shaped tube (1) is arranged at an angle, and the minimum included angle with respect to the horizontal plane is 45°-65°.

6. The waste heat recovery device for a copper smelting furnace according to claim 4, characterized in that, Multiple heat exchange tubes are connected in series to form a heat exchange channel. The rectangular chamber (4) is fixedly equipped with an inlet pipe (41) and an outlet pipe (42). The inlet pipe (41) is fixedly connected to the inlet of the heat exchange channel, and the outlet pipe (42) is fixedly connected to the outlet of the heat exchange channel.

7. The waste heat recovery device for a copper smelting furnace according to claim 6, characterized in that, One end of the rectangular cabin (4) is fixedly installed with an upper conical air guide (43), and the other end is fixedly installed with a lower conical air guide (44). The water inlet pipe (41) is distributed close to the lower conical air guide (44).

8. The waste heat recovery device for a copper smelting furnace according to claim 7, characterized in that, The upper conical air vent (43) is provided with multiple matrix-arranged heat-conducting plates (431).

9. A waste heat recovery device for a copper smelting furnace according to claim 8, characterized in that, The heat-conducting plate (431) has a V-shaped cross-section and is distributed with fixed points facing the lower conical air guide (44). The heat-conducting plates (431) in two adjacent vertical rows maintain a predetermined distance to form a flue gas guide channel (100).

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