Heat exchanger for Z-shaped flue of anode furnace

Abstract

The invention discloses a heat exchanger for a Z-shaped flue of an anode furnace, and belongs to the technical field of energy conservation and consumption reduction in non-ferrous metal smelting. The heat exchanger comprises at least one heat exchange pipe, the heat exchange pipe is arranged in a Z-shaped flue and is connected with the inner wall of the flue through a fixing piece, the heat exchange pipe is a Z-shaped heat exchange pipeline, is provided with a plurality of bent positions and is in a plurality of U shapes which are connected in sequence, the heat exchanger further comprises a reinforced splitter plate, and the reinforced splitter plate is installed in the middle of the flue and is connected with the heat exchange pipe. And the reinforced splitter plate is parallel to the inner wall of the flue, so that the flow direction of high-temperature flue gas and the arrangement of the heat exchange tubes are always kept in the vertical direction. The heat exchange pipes are matched with the Z-shaped flue, so that the flowing direction of high-temperature flue gas and the arrangement of the heat exchange pipes are always kept in the vertical direction, and the heat exchange efficiency of the heat exchange pipes is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of energy saving and consumption reduction in nonferrous metal smelting, and more specifically, relates to a heat exchanger for a "Z"-shaped flue of an anode furnace. Background Art

[0002] Copper refining anode furnace is a copper refining equipment commonly used in modern times. It is widely used in large copper smelters at home and abroad. It has the advantages of large capacity, high degree of mechanization and automation, flexible operation, small heat dissipation loss, good sealing, etc. However, the anode furnace is also the largest energy consumer in the entire copper smelting production process. As energy supply becomes increasingly tight, more stringent requirements are also put forward for environmental protection. Therefore, it is urgent to develop new energy-saving and consumption-reducing technologies and equipment at this stage.

[0003] The copper refining anode furnace smelting process is divided into four smelting stages: charging, oxidation, reduction and casting. The flue gas generated in the oxidation stage will be as high as about 1200-1300℃, and the flue gas temperature generated in the reduction stage will be as high as about 1400℃. If this part of the heat can be recycled, such as using waste heat from combustion air and using steam for smelting heating, it can greatly reduce production energy consumption, which is of great significance to energy conservation and consumption reduction of non-ferrous metal enterprises.

[0004] At present, the waste heat recovery devices and technologies developed for the recovery and utilization of waste heat from high-temperature flue gas generated by anode furnaces are mostly limited by the high flue gas temperature at the outlet of the anode furnace, the large dust content in the flue gas, and the large fluctuations in flue gas temperature and volume during different smelting periods. These problems make the recovery of this part of waste heat resources difficult and the recovery effect is unsatisfactory.

[0005] In order to solve the above problems, after searching, Chinese patent CN207395499U discloses a heat exchange device and a water-cooled smelting furnace with the same. The heat exchange device includes: a flue, a heat exchanger, a water inlet pipe and a water outlet pipe. The flue is used to connect the smelting furnace and the dust collecting equipment. A smoke exhaust channel is defined in the flue. Both ends of the flue have a smoke inlet and a smoke outlet connected to the smoke exhaust channel. The heat exchanger is arranged in the smoke exhaust channel, and each heat exchanger has a water inlet and a water outlet. The water inlet pipe is connected to the water inlet of the heat exchanger, and the drain pipe is connected to the water outlet of the heat exchanger. The cooling water enters the heat exchanger through the water inlet pipe for heat exchange and is discharged through the drain pipe. This patent adopts a water cooling method for waste heat recovery. The device needs to be installed independently, and the smoke needs to be introduced into the heat exchanger, and finally the smoke is led out to the designated location, which makes the device inconvenient to install.

[0006] For another example, Chinese patent CN203518648U discloses an anode furnace flue gas cooling device, which includes a bracket, a cooling pipe and an ash hopper, and is characterized in that the cooling pipe is connected to the top of the bracket with both ends opening downward, the ash hopper is connected to the bottom of the bracket with the hopper mouth facing upward, the opening of the cooling pipe is connected to the hopper mouth of the ash hopper, and each cooling pipe is connected in sequence through the hopper mouth of each ash hopper, the flue gas inlet pipe is connected to the front ash hopper, and the flue gas outlet pipe is connected to the rear ash hopper. The flue gas inlet pipe, the cooling pipe, the ash hopper and the flue gas outlet pipe form a flue gas cooling channel, and a water tank is provided above the bracket and around the cooling pipe, a water inlet pipe is provided at the lower end of the water tank, and a water outlet pipe is provided at the upper end.

[0007] Patent CN106918251A discloses a simple flue gas waste heat utilization device, which includes a heat exchange box whose upper end is connected to the smoke inlet pipe and a heat exchange tube passing through the heat exchange box. The heat exchange tube is arranged in a Z shape in the heat exchange box. The lower part of the heat exchange box is connected to a smoke exhaust pipe. The bottom of the heat exchange box is set as an inclined surface, and an ash discharge port is opened at the bottom of the inclined surface. The ash discharge port is connected to the ash discharge pipe.

[0008] However, the above device is not applicable to a "Z"-shaped flue, and the heat exchange efficiency of the flue gas in the "Z"-shaped flue is low. Summary of the invention

[0009] 1. Problem to be solved

[0010] In view of the problem of low heat exchange efficiency of existing heat exchange devices in a "Z"-shaped flue, the present invention provides a heat exchanger for the "Z"-shaped flue of an anode furnace, which ensures that the flow direction of high-temperature flue gas and the arrangement of heat exchange tubes are always kept in a vertical direction, thereby effectively improving the heat exchange efficiency of the heat exchange tubes.

[0011] 2. Technical solution

[0012] In order to solve the above problems, the technical solution adopted by the present invention is as follows:

[0013] The present invention discloses a heat exchanger for a "Z"-shaped flue of an anode furnace. The heat exchanger comprises at least one heat exchange tube, which is placed in the "Z"-shaped flue and connected to the inner wall of the flue through a fixing member.

[0014] The heat exchange pipe is a "Z"-shaped heat exchange pipe, which is provided with a number of bends and mutually parallel vertical sections, presenting a plurality of U-shaped sections connected in sequence, so that the high-temperature flue gas flow direction and the heat exchange pipe are always kept in a vertical direction. Specifically, the "Z"-shaped flue includes 1 section of flue, 2 sections of flue and 3 sections of flue, and the "Z"-shaped heat exchange pipe includes 1 section of heat exchange pipe, 2 sections of heat exchange pipe and 3 sections of heat exchange pipe. The 1 section of heat exchange pipe is located in the 1 section of flue, the 2 sections of heat exchange pipe are located in the 2 sections of flue, and the 3 sections of heat exchange pipe are located in the 3 sections of flue. The 1 section of heat exchange pipe, the 2 sections of heat exchange pipe and the 3 sections of heat exchange pipe are connected in sequence, and a first elbow joint is provided between the 1 section of heat exchange pipe and the 2 sections of heat exchange pipe, and a second elbow joint is provided between the 2 sections of heat exchange pipe and the 3 sections of heat exchange pipe.

[0015] Preferably, the diameter of the heat exchange tube is 26-40mm, the turning radius of the first elbow joint at the connection between the first section of the flue and the second section of the flue is 50mm, and its inner diameter is equal to the diameter of the heat exchange tube, which is 26-40mm; the turning radius of the second elbow joint at the connection between the second section of the flue and the third section of the flue is 50mm, and the inner diameter is 26-40mm. Among them, the elbow at the connection between the first section of the flue and the second section of the flue has two bends, and the bending parts here serve as thermal stress buffer parts between the first section of the heat exchange tube and the second section of the heat exchange tube, which can effectively solve the thermal stress problem caused by the operation of the heat exchanger, prevent the heat exchange tube from expanding here, and ensure the normal operation of the heat exchanger.

[0016] A plurality of heat exchange tubes are fixed by an enhanced diverter plate, and the enhanced diverter plate is installed in the middle of the flue and is parallel to the flue. Specifically, in the first section of the flue, an enhanced diverter plate is provided, and the enhanced diverter plate is parallel to the wall of the first section of the flue; in the second section of the flue, two enhanced diverter plates are provided, and the two enhanced diverter plates are parallel to the wall of the second section of the flue, so that the two sections of heat exchange tubes are symmetrical along the enhanced diverter plates; in the third section of the flue, two enhanced diverter plates are provided, and the two enhanced diverter plates are parallel to the wall of the third section of the flue, so that the three sections of heat exchange tubes are symmetrical along the enhanced diverter plates.

[0017] To ensure that the high-temperature flue gas flow direction and the heat exchange tube arrangement are always kept in a vertical direction to ensure maximum heat exchange efficiency.

[0018] Preferably, the distance between the enhanced diverter plate in the 1st section flue and the top of the upper wall of the 1st section flue is 480-485mm; the distance between the upper half of the enhanced diverter plate in the 2nd section flue and the top of the upper wall of the flue is 614-620mm, the distance between the lower half of the enhanced diverter plate and the bottom of the lower wall of the flue is 150-155mm, and the spacing between the two enhanced diverter plates is 730-735mm; the distance between the upper half of the enhanced diverter plate in the 3rd section flue and the top of the upper wall of the flue is 585-590mm, the distance between the lower half of the enhanced diverter plate and the bottom of the lower wall of the flue is 305-310mm, and the spacing between the two enhanced diverter plates is 595-600mm.

[0019] In order to solve the problem that the heat exchanger cannot operate normally due to slag splashing and ash accumulation caused by smelting in the anode furnace, special treatment is made for the arrangement of the first section of heat exchange tubes.

[0020] The heat exchange tubes in the first flue are arranged only in the upper part of the flue, and no heat exchange tubes are arranged in the lower part. The longest straight section of the heat exchange tubes in the first flue is 360mm, accounting for 20%-50% of the first flue, and gradually decreases to both sides, thus forming a blank area for the slag splashing platform.

[0021] The fixing part includes a hanging part and an angle steel for fixing the hanging part, the heat exchange tube is hung below the hanging part, and the angle steel is arranged in the flue pipe wall. The upper ends of the 1st section heat exchange tube and the 3rd section heat exchange tube are hung in the flue through the fixing part, and the lower ends are against the inner wall of the flue, and the heat exchange tube is fixed by using its own gravity as the pipe support force.

[0022] An air supply box is provided below the three-stage flue, and the air supply box is connected to the inlet of the three-stage heat exchange tube. An air collection box is provided above the one-stage flue, and the air collection box is connected to the outlet of the one-stage heat exchange tube. The cold medium flows from the air supply box into the three-stage heat exchange tube, is heated in the flue, and flows out from the outlet of the one-stage heat exchange tube into the air collection box. The flue gas enters from the one-stage flue, and after sufficient heat exchange with the heat exchange tube, the cooled flue gas flows out from the three-stage flue.

[0023] 3. Beneficial effects

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) A heat exchanger for a "Z"-shaped flue of an anode furnace of the present invention is provided with a plurality of U-shaped heat exchange tubes connected in sequence in the flue, and the heat exchange tubes are adapted to the "Z"-shaped flue, so that the high-temperature flue gas flow direction and the arrangement of the heat exchange tubes are always kept in a vertical direction, thereby improving the heat exchange efficiency of the heat exchange tubes;

[0026] (2) A heat exchanger for a "Z"-shaped flue of an anode furnace according to the present invention is provided with a reinforcing diverter plate parallel to the flue in the flue, and the reinforcing diverter plate is used to enhance the flue gas guiding effect, so that the high-temperature flue gas flow direction and the arrangement of the heat exchange tubes are always kept in a vertical direction, thereby improving the heat exchange efficiency of the heat exchange tubes;

[0027] (3) The present invention is a heat exchanger for a "Z"-shaped flue of an anode furnace, in which the heat exchange tubes in one section of the flue are arranged only in the upper half of the flue, and no heat exchange tubes are arranged in the lower half. The straight-flow section of one section of the heat exchange tube occupies 20%-50% of one section of the flue, forming a blank area in one section of the flue as a slag splashing platform to prevent slag splashing and ash accumulation on the heat exchange tubes during smelting in the anode furnace, which affects the normal operation of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but it should be understood that these drawings are designed only for explanation purposes and are not intended to limit the scope of the present invention. In addition, unless otherwise specified, these drawings are intended only to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.

[0029] Figure 1 It is a schematic cross-sectional view of the overall structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the arrangement of heat exchange tubes on the left end face of the three sections of the "Z"-shaped flue;

[0031] Figure 3 for Figure 2 Enlarged view of part A in the middle;

[0032] Figure 4 This is a schematic diagram of the arrangement of heat exchange tubes on the right end face of the first section of the "Z"-shaped flue;

[0033] Figure 5 It is a schematic diagram of the structure of the "Z"-shaped flue gas supply box and gas collecting box;

[0034] In the figure: 1, flue; 11, 1st section of flue; 12, 2nd section of flue; 13, 3rd section of flue;

[0035] 2. heat exchange tube; 21. heat exchange tube; 22. heat exchange tube; 23. heat exchange tube;

[0036] 3. Strengthen the manifold;

[0037] 4. Fixing parts; 41. Lifting parts; 42. Angle steel; 43. Rebar;

[0038] 5. Air supply box;

[0039] 6. Gas collecting box; 61. Support member; 611. Vertical support rod; 62. Diagonal support rod. DETAILED DESCRIPTION

[0040] The following detailed description of exemplary embodiments of the present invention refers to the accompanying drawings, which form a part of the description, and in which exemplary embodiments of the present invention that can be implemented are shown as examples. Although these exemplary embodiments are described in sufficient detail to enable those skilled in the art to implement the present invention, it should be understood that other embodiments can be implemented and various changes can be made to the present invention without departing from the spirit and scope of the present invention. The following more detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but is only for the purpose of illustrating and not limiting the description of the characteristics and features of the present invention, so as to propose the best mode for performing the present invention and to enable those skilled in the art to implement the present invention. Therefore, the scope of the present invention is limited only by the appended claims.

[0041] It should be understood that the following text is only used to describe one or several specific embodiments of the present invention, and does not strictly limit the scope of protection of the specific claims of the present invention. As used herein, the terms "parallel" and "perpendicular" are not limited to their strict geometric definitions, but include tolerances for reasonable and inconsistent machining or human errors.

[0042] Example

[0043] like Figure 1-3 As shown, a heat exchanger for a "Z"-shaped flue 1 of an anode furnace of the present invention comprises at least one heat exchange tube 2, which is placed in the "Z"-shaped flue 1 and connected to the inner wall of the flue 1 through a fixing member 4. The high-temperature flue gas flow direction and the arrangement of the heat exchange tube 2 are always kept in a vertical direction to ensure the maximum heat exchange efficiency.

[0044] The heat exchange tube 2 is a "Z"-shaped heat exchange tube 2, which is provided with a plurality of bends and mutually parallel vertical sections, presenting a plurality of U-shaped sections connected in sequence. Specifically, the "Z"-shaped flue 1 includes a flue 11, a flue 12 and a flue 13, and the "Z"-shaped heat exchange tube 2 includes a heat exchange tube 21, a heat exchange tube 22 and a heat exchange tube 23. The heat exchange tube 21 is located in the flue 11, the heat exchange tube 22 is located in the flue 12, and the heat exchange tube 23 is located in the flue 13. The heat exchange tube 21, the heat exchange tube 22 and the heat exchange tube 23 are connected in sequence, and a first elbow joint is provided between the heat exchange tube 21 and the heat exchange tube 22, and a second elbow joint is provided between the heat exchange tube 22 and the heat exchange tube 23.

[0045] The diameter of the heat exchange tube 2 in Example 1 is 36 mm, the turning radius of the first elbow joint at the connection between the first section of flue 11 and the second section of flue 12 is 50 mm, and its inner diameter is equal to the diameter of the heat exchange tube 2, which is 36 mm; the turning radius of the second elbow joint at the connection between the second section of flue 12 and the third section of flue 13 is 50 mm, and the inner diameter is 36 mm, so as to ensure that the flow rate of the fluid in the heat exchange tube 2 is above 15 m / s. Among them, the elbow at the connection between the first section of flue 11 and the second section of flue 12 has two bends, and the bending parts here serve as thermal stress buffer parts for the first section of heat exchange tube 21 and the second section of heat exchange tube 22, which can effectively solve the thermal stress problem caused by the operation of the heat exchanger, prevent the heat exchange tube 2 from expanding here, and ensure the normal operation of the heat exchanger.

[0046] In Example 1, a total of 14 heat exchange tubes 2 are provided, and the heat exchange tubes 2 are long in the middle of the flue 1 and gradually decrease on both sides. The distance between the enhanced diverter plate 3 in the first section of the flue 11 and the top of the upper wall of the first section of the flue 11 is 495 mm; the distance between the upper half of the enhanced diverter plate 3 in the second section of the flue 12 and the top of the upper wall of the flue 1 is 620 mm, the distance between the lower half of the enhanced diverter plate 3 and the bottom of the lower wall of the flue 1 is 150 mm, and the distance between the two enhanced diverter plates 3 is 730 mm; the distance between the upper half of the enhanced diverter plate 3 in the third section of the flue 13 and the top of the upper wall of the flue 1 is 590 mm, the distance between the lower half of the enhanced diverter plate 3 and the bottom of the lower wall of the flue 1 is 310 mm, and the distance between the two enhanced diverter plates 3 is 600 mm.

[0047] A plurality of heat exchange tubes 2 are fixed by an enhanced diverter plate 3, and the enhanced diverter plate 3 is installed in the middle of the flue 1 and is parallel to the flue 1. Specifically, in the first section of the flue 11, an enhanced diverter plate 3 is provided, and the enhanced diverter plate 3 is parallel to the wall of the first section of the flue 11; in the second section of the flue 12, two enhanced diverter plates 3 are provided, and the two enhanced diverter plates 3 are parallel to the wall of the second section of the flue 12, so that the second section of the heat exchange tube 22 is symmetrical along the enhanced diverter plate 3; in the third section of the flue 13, two enhanced diverter plates 3 are provided, and the two enhanced diverter plates 3 are parallel to the wall of the third section of the flue 13, so that the third section of the heat exchange tube 23 is symmetrical along the enhanced diverter plate 3.

[0048] In order to solve the problem that the heat exchanger cannot operate normally due to slag splashing and ash accumulation caused by smelting in the anode furnace, special treatment is performed on the arrangement of the first section of heat exchange tubes 21.

[0049] The heat exchange tubes 2 in the first flue 11 are arranged only in the upper part of the flue 1, and no heat exchange tubes 2 are arranged in the lower part. The inner diameter of the first flue 11 is 1500 mm, and the longest straight section of the first heat exchange tube 21 is 360 mm, accounting for 24% of the first flue 11, and gradually decreases to both sides, thereby forming a blank area for the slag splashing platform.

[0050] The fixing member 4 includes a hanging member 41 and an angle steel 42 for fixing the hanging member 41. The heat exchange tube 2 is hung below the hanging member 41, and the angle steel 42 is arranged in the wall of the flue 1. The upper ends of the two-section heat exchange tube 22 and the three-section heat exchange tube 23 are hung in the flue 1 through the fixing member 4, and the lower ends are against the inner wall of the flue 1, and the heat exchange tube 2 is fixed by using its own gravity as the pipe support force.

[0051] like Figure 1 As shown, an air supply box 5 is provided below the three-stage flue 13, and the air supply box 5 is connected to the inlet of the three-stage heat exchange tube 23. An air collecting box 6 is provided above the one-stage flue 11, and the air collecting box 6 is connected to the outlet of the one-stage heat exchange tube 21. The cooling medium flows from the air supply box 5 into the three-stage heat exchange tube 23, is heated in the flue 1, and flows out from the outlet of the one-stage heat exchange tube 21 into the air collecting box 6. The flue gas enters from the one-stage flue 11, and after sufficient heat exchange with the heat exchange tube 2, the cooled flue gas flows out from the three-stage flue 13.

[0052] It is worth noting that in order to improve the heat exchange efficiency of the heat exchanger of the present invention, the present application adopts a Z-shaped heat exchange tube 2 on the one hand, and utilizes its multiple bending sections to improve the cooling path, and controls the cooling performance by controlling the inner diameter of the heat exchange tube 2 and the distance between it and the flue 1. Another invention is to control the inflow direction of the flue gas to remain perpendicular to the heat exchange tube 2 so that it can obtain the maximum cooling rate. Specifically, in order to control the inflow direction of the flue gas, the present application introduces an enhanced diverter plate 3 to guide the gas. Further considering the aerodynamic relationship between the flue gas in the flue 1 and the inner wall of the flue 1 and the heat exchange tube 2, the setting position of the enhanced diverter plate 3 and the positional relationship between the heat exchange tube 2 and the flue 1 are controlled to achieve the maximum cooling rate of the flue gas in the pipeline.

[0053] In a specific embodiment of the present invention, the two "Z"-shaped heat exchange tubes are made of 347H stainless steel, with an inner diameter of 26-40 mm and a wall thickness of 1-2 mm.

[0054] The gas collecting box 6 device for inflow and discharge is made of ordinary carbon steel, and the pipeline for inflow and discharge of the cooling medium fluid is made of high-temperature resistant silicone hose, the inner diameter of the pipeline is 54-58mm, and the wall thickness is 1-2mm.

[0055] A small hole with an inner diameter of 55-60 mm is provided in the middle of the top of the gas collecting box 6 above the first section of the flue 11, and a small hole with an inner diameter of 55-60 mm is provided in the middle of the bottom of the gas supply box 5 below the third section of the flue 13, both of which are used to assemble pipes for the entry and discharge of the cooling medium. The gas collecting box 6 is equipped with a support 61. The gas collecting box 6 is fixed above the first section of the flue 11 by the support 61, which includes at least one vertical support rod 611 and at least one diagonal support rod 612. The support rod is made of ordinary carbon steel with a thickness of 10-15 mm, and is used to support and fix the gas collecting box 6. When the number of the vertical support rods 611 and the diagonal support rods 612 are two or more, the support rods are distributed in an "M" shape.

[0056] In addition to the above features, the heat exchanger structure installation diagram is as follows Figure 5 As shown. The "Z"-shaped flue 1 needs to be split into two parts from the center line, and the heat exchange tube 2 can be first installed in the upper part of the flue 1. After the heat exchange tube 2 is installed, the upper part of the flue 1 is connected to the lower part of the flue 1. The specific implementation is as follows.

[0057] In the present invention, the heat exchange tube 2 is fixed to the flue 1 by welding and hoisting. The fixing member 4 includes a hoisting member 41 and an angle steel 42 for fixing the hoisting member 41. The heat exchange tube 2 is hung below the hoisting member 41, and the angle steel 42 is arranged in the wall of the flue 1. The upper ends of the 2-section heat exchange tube 22 and the 3-section heat exchange tube 23 are hung in the flue 1 by the fixing member 4, and the lower ends are against the inner wall of the flue 1, and the heat exchange tube 2 is fixed by the weight of the heat exchange tube 2 itself as the pipeline support force.

[0058] Specifically, in the 1st section of flue 11 and the 3rd section of flue 13, 28 angle steels 42 are selected and installed on the upper walls of the 1st section of flue 11 and the 3rd section of flue 13, respectively, and the angle steels 42 are fixed to the flue 1 with bolts, wherein each angle steel 42 in the upper half of the 1st section of flue 11 is fixed with 5 bolts, and the bolts at the head and tail of the angle steel 42 penetrate the entire wall of the flue 1, and the length of the angle steel 42 is consistent with the thickness of the upper half of the wall of the 1st section of flue 11. Similarly, the installation method and specifications of the angle steel 42 of the 3rd section of flue 13 are the same as those of the angle steel 42 of the 1st section of flue 11.

[0059] After the angle steel 42 is installed, the heat exchange tube 2 can be installed. The heat exchange tube 2 is connected to the angle steel 42 through a hanging member. In this embodiment, the hanging member is a "U"-shaped pipe fixing member 4, and the "U"-shaped pipe fixing member 4 is welded to the angle steel 42.

[0060] A "U"-shaped pipe fixing part 4 is arranged at the bends of the first section heat exchange pipe 21 and the third section heat exchange pipe 23. After the arrangement is completed, the "U"-shaped pipe fixing part 4 is welded to the angle steel 42 to realize the hanging of the heat exchange pipe 2.

[0061] The connection between the first section of flue 11 and the second section of flue 12 and the connection between the second section of flue 12 and the third section of flue 13 can be directly hoisted by five steel bars 43. Specifically, in the first section of flue 11, there is a reinforced diverter plate 3, which is parallel to the wall of the first section of flue 11; in the second section of flue 12, there are two reinforced diverter plates 3, which are parallel to the wall of the second section of flue 12, so that the two sections of heat exchange tubes 22 are symmetrical along the reinforced diverter plates 3; at the intersection of the reinforced diverter plates 3 of the first section of flue 11 and the reinforced diverter plates 3 of the second section of flue 12, there are five parallel steel bars 43, the upper ends of the steel bars 43 are connected to the inner wall of the flue 1, and the lower ends pass through the intersection of the reinforced diverter plates 3, and are welded to the reinforced diverter plates 3 to realize the hanging of the reinforced diverter plates 3.

[0062] Similarly, two enhanced diverter plates 3 are provided in the three-section flue 13, and the two enhanced diverter plates 3 are parallel to the wall of the three-section flue 13, so that the three-section heat exchange tubes 23 are symmetrical along the baffle plate, and five parallel steel bars 43 are respectively provided at the intersection of the enhanced diverter plate 3 of the two-section flue 12 and the two enhanced diverter plates 3 of the three-section flue 13. The upper end of the steel bar 43 is connected to the inner wall of the flue 1, and the lower end passes through the intersection of the enhanced diverter plates 3 and is welded to the enhanced diverter plates 3 to realize the hanging of the two enhanced diverter plates 3.

[0063] After the heat exchange tube 2 is installed, the upper part of the flue 1 and the heat exchange tube 2 can be directly placed on the lower part of the flue 1, and then the upper and lower parts of the flue 1 are connected by welding or other methods. It is worth noting that since the temperature of the flue 1 is relatively high, in order to prevent the high temperature from affecting the flue 1 and the heat exchange tube 2, it is necessary to first cover the cross-section of the upper and lower parts of the flue 1 with refractory mud, and then place the upper and lower parts of the flue 1 together and combine them. After that, the steel structure of the outer wall of the flue 1 needs to be re-welded to ensure the stability of the overall structure of the flue 1.

[0064] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope involved in the present application is not limited to the technical solution formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the inventive concept, such as a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

[0065] Except for the technical features described in the specification, the remaining technical features are known technologies to those skilled in the art. In order to highlight the innovative features of the present invention, the remaining technical features will not be described here in detail.

Claims

1. A heat exchanger for a "Z"-shaped flue of an anode furnace, the heat exchanger comprising at least one heat exchange tube (2), characterized in that: The heat exchange tube (2) is placed in a "Z"-shaped flue (1) and connected to the inner wall of the flue (1) via a fixing member (4). The heat exchange tube (2) is a "Z"-shaped heat exchange tube (2) and is provided with a plurality of bends and mutually parallel vertical sections, so that the high-temperature flue gas flow direction and the heat exchange tube (2) are always maintained in a vertical direction.

2. The heat exchanger according to claim 1, characterized in that: The "Z"-shaped flue (1) comprises: a first section of flue (11), a second section of flue (12) and a third section of flue (13); the "Z"-shaped heat exchange tube (2) comprises a first section of heat exchange tube (21), a second section of heat exchange tube (22) and a third section of heat exchange tube (23); the first section of heat exchange tube (21) is located in the first section of flue (11); the second section of heat exchange tube (22) is located in the second section of flue (12); the third section of heat exchange tube (23) is located in the third section of flue (13); the first section of heat exchange tube (21), the second section of heat exchange tube (22) and the third section of heat exchange tube (23) are connected in sequence; a first elbow joint is provided between the first section of heat exchange tube (21) and the second section of heat exchange tube (22); and a second elbow joint is provided between the second section of heat exchange tube (22) and the third section of heat exchange tube (23).

3. The heat exchanger according to claim 1, characterized in that: It also comprises an enhanced flow divider plate (3), which is installed in the middle of the flue (1) and connected to the heat exchange tube (2), and the enhanced flow divider plate (3) is parallel to the inner wall of the flue (1).

4. The heat exchanger according to claim 3, characterized in that: The first section of the flue (11) is provided with an enhanced flow divider plate (3), and the enhanced flow divider plate (3) is parallel to the wall surface of the first section of the flue (11); the second section of the flue (12) is provided with two enhanced flow dividers (3), and the two enhanced flow dividers (3) are parallel to the wall surface of the second section of the flue (12), so that the two sections of heat exchange tubes (22) are symmetrical along the enhanced flow divider plate (3); the third section of the flue (13) is provided with two enhanced flow dividers (3), and the two enhanced flow dividers (3) are parallel to the wall surface of the third section of the flue (13), so that the three sections of heat exchange tubes (23) are symmetrical along the enhanced flow divider plate (3).

5. The heat exchanger according to claim 1, characterized in that: The length of the first section of heat exchange tube (21) is smaller than the diameter of the first section of flue (11), so that a blank area is provided below the first section of heat exchange tube (21) and between the first section of flue (11).

6. The heat exchanger according to claim 5, characterized in that The length of the straight-through section of the heat exchange tube (21) accounts for 20%-50% of the diameter of the flue (11).

7. The heat exchanger according to claim 6, characterized in that The length of the heat exchange tube (2) decreases from the middle to both sides.

8. The heat exchanger according to claim 7, characterized in that The fixing member (4) comprises a hanging member (41) and an angle steel (42); the heat exchange tube (2) is hung in the flue (1) via the fixing member (4); the lower ends of the second section of the heat exchange tube (22) and the third section of the heat exchange tube (23) are in contact with the inner wall of the flue (1).

9. The heat exchanger according to claim 8, characterized in that It also comprises steel bars (43), and the reinforced diverter plate (3) is connected to the flue pipe wall via the steel bars (43).

10. The heat exchanger according to claim 2, characterized in that An air supply box (5) is provided below the three-section flue (13), and the air supply box (5) is connected to the inlet of the three-section heat exchange pipe (23); an air collecting box (6) is provided above the one-section flue (11), and the air collecting box (6) is connected to the outlet of the one-section heat exchange pipe (21).

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