Shell-and-tube heat exchanger

Abstract

The utility model discloses a shell-and-tube heat exchanger which comprises a shell guiding outdoor air to flow and a heat exchange assembly guiding smoke to flow, the heat exchange assembly is arranged in the shell, and tube boxes communicated with the heat exchange assembly are detachably arranged at the two ends of the shell. A pass partition plate used for dividing an inner cavity of the tube box into two independent cavities is arranged in one tube box. According to the heat exchanger, the inner cavity of one tube box is divided into two independent cavities through the pass partition plate, so that smoke entering from the gas inlet flange tube flows into the other tube box through part of the heat exchange assemblies communicated with the gas inlet flange tube, then flows back to the tube box on the other side through the rest of the heat exchange assemblies, and is discharged from the gas outlet flange tube; the communicating cavities of the air inlet flange pipe and the air outlet flange pipe are switched through the air inlet and outlet switching mechanism, so that the positions of the air inlet part and the air outlet part of the heat exchange assembly are exchanged, the heat exchange assembly is heated and corroded more uniformly, and the overall service life of the heat exchanger is effectively prolonged.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, and in particular to a shell-and-tube heat exchanger. Background Technology

[0002] The statements herein provide only background information related to this invention and do not necessarily constitute prior art.

[0003] In the processes of iron and steel smelting and non-ferrous metal pyrometallurgical smelting, the flue gas contains a large amount of waste heat, which needs to be recovered to increase economic benefits. Since some enterprises do not have the need to use steam in the production process, they will install air heat exchangers to recover the waste heat of the flue gas through production hot air.

[0004] Current air heat exchangers work by passing flue gas through heat exchange tubes and cold air through the outside of the tube shell for heat exchange. However, because the flue gas temperature at the inlet is much higher than that at the outlet, the heat exchange tubes at the inlet corrode faster. When the heat exchange tubes in the high-temperature heat exchange area are severely corroded, the entire air heat exchanger can no longer be used, resulting in a short service life. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned shortcomings by providing a shell-and-tube heat exchanger that extends the overall service life of the heat exchanger.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a shell-and-tube heat exchanger, comprising a shell for guiding the flow of outdoor air and a heat exchange component for guiding the flow of flue gas, wherein the heat exchange component is disposed inside the shell, and tube boxes connected to the heat exchange component are detachably disposed at both ends of the shell. One of the tube boxes is provided with a partition plate for dividing the inner cavity of the tube box into two independent chambers. Corresponding to the tube box are an inlet flange pipe and an outlet flange pipe respectively connected to the two chambers, and an inlet / outlet switching mechanism for switching the chambers connected by the inlet flange pipe and the outlet flange pipe.

[0007] Furthermore, the inlet flange pipe and the outlet flange pipe are staggered, and the inlet and outlet switching mechanism includes two air guide pipes disposed on the partition plate and located in two chambers respectively. The partition plate is provided with through holes that communicate with the air guide pipes, and the two air guide pipes are respectively connected to the inlet flange pipe and the outlet flange pipe.

[0008] The inlet / outlet switching mechanism also includes a flipping assembly for rotating the partition plate and the air guide pipe together, and a dynamic sealing assembly for keeping the partition plate and the air guide pipe sealed with the corresponding pipe box when rotating.

[0009] Furthermore, the flipping assembly includes a rotating rod rotatably disposed within the partition plate, with a turntable fixedly disposed at one end of the rotating rod outside the tube box, and an eccentric block inserted into the partition plate fixedly disposed at the other end of the rotating rod inside the tube box.

[0010] Furthermore, the air inlet / outlet switching mechanism is provided with a positioning mechanism for positioning the partition plate after the partition plate is flipped.

[0011] The positioning mechanism includes a positioning sleeve disposed inside the air guide tube and movable along the axis of the air guide tube. A lifting rod is provided at one end of the positioning sleeve near the rotating rod. A C-shaped sleeve is sleeved on the rotating rod at one end of the lifting rod near the rotating rod. The positioning mechanism also includes a lever fixedly disposed on the rotating rod and used to move the C-shaped sleeve.

[0012] When the positioning sleeve moves to its limit position closer to the rotating rod, both ends of the positioning sleeve are inside the air guide tube. When the positioning sleeve moves to its limit position further away from the rotating rod, one end of the positioning sleeve moves outside the air guide tube. The dividing plate is provided with an arc-shaped groove for the eccentric block to rotate 90 degrees. The height of the lever is not less than the maximum length of the positioning sleeve moving outside the air guide tube, and the two levers are perpendicular to each other.

[0013] Furthermore, a recess is provided in the bottom cavity of the pipe box for inserting and positioning the positioning sleeve in the air guide pipe that is misaligned with the air outlet flange pipe.

[0014] Furthermore, the turntable is provided with protrusions, and two stops are provided on the pipe box in the rotation area of ​​the protrusions to mark the two flip states of the split partition.

[0015] The beneficial effects of this utility model are reflected in:

[0016] This invention divides the inner cavity of one tube box into two independent chambers using a partition plate. This allows the flue gas entering from the inlet flange pipe to flow through a heat exchange component connected to it into the other tube box, and then back through the remaining heat exchange component to the other tube box before being discharged from the outlet flange pipe. After a period of operation, an inlet / outlet switching mechanism switches the connected chambers of the inlet and outlet flange pipes, exchanging the positions of the inlet and outlet portions of the heat exchange component. This results in more uniform heat corrosion of the heat exchange component and effectively extends the overall service life of the heat exchanger. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present invention;

[0018] Figure 2 for Figure 1 A magnified view of a portion of point C is shown below;

[0019] Figure 3 This is a partial exploded view of the present invention;

[0020] Figure 4 This is a working view of the partition plate when the inlet flange pipe is connected to the upper chamber and the outlet flange pipe is connected to the lower chamber.

[0021] Figure 5 This is a working state view of the partition plate when the inlet flange pipe is connected to the lower chamber and the outlet flange pipe is connected to the upper chamber.

[0022] Figure 6 This is a partial view of the air inlet / outlet switching mechanism of this utility model;

[0023] Figure 7 for Figure 5 A magnified view of a portion of point A shown;

[0024] Figure 8 for Figure 5 A magnified view of a portion of point B shown.

[0025] In the picture:

[0026] 1. Shell; 2. Heat exchange assembly; 3. Tube box; 4. Divider plate; 5. Inlet flange; 6. Outlet flange; 7. Inlet / outlet switching mechanism; 71. Air guide pipe; 72. Rotating rod; 73. Turntable; 74. Eccentric block; 8. Positioning mechanism; 81. Positioning sleeve; 82. Lifting rod; 83. C-shaped ferrule; 84. Pulley. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0028] Please see Figure 1-8 This utility model discloses a shell-and-tube heat exchanger, including a shell 1 for guiding the flow of outdoor air and a heat exchange component 2 for guiding the flow of flue gas. The heat exchange component 2 is disposed inside the shell 1. Both ends of the shell 1 are detachably provided with tube boxes 3 that are connected to the heat exchange component 2. One of the tube boxes 3 is provided with a partition plate 4 for dividing the inner cavity of the tube box 3 into two independent chambers. Correspondingly, the tube box 3 is provided with an inlet flange pipe 5 and an outlet flange pipe 6 that are respectively connected to the two chambers, and an inlet / outlet switching mechanism 7 for switching the chambers connected to the inlet flange pipe 5 and the outlet flange pipe 6.

[0029] This invention divides the inner cavity of one of the tube boxes 3 into two independent chambers by a partition plate 4. This allows the flue gas entering from the inlet flange pipe 5 to flow through the heat exchange component 2 connected to it into the other tube box 3, and then back through the remaining heat exchange component 2 to the other tube box 3, before being discharged from the outlet flange pipe 6. After a period of operation, the inlet and outlet switching mechanism 7 switches the connected chambers of the inlet flange pipe 5 and the outlet flange pipe 6, exchanging the positions of the inlet and outlet parts of the heat exchange component 2. This results in more uniform heat corrosion of the heat exchange component 2 and effectively extends the overall service life of the heat exchanger.

[0030] In one embodiment, the inlet flange pipe 5 and the outlet flange pipe 6 are staggered. The inlet and outlet switching mechanism 7 includes two air guide pipes 71 disposed on the partition plate 4 and located in two chambers respectively. The partition plate 4 has through holes that communicate with the air guide pipes 71. The two air guide pipes 71 are respectively connected to the inlet flange pipe 5 and the outlet flange pipe 6.

[0031] The inlet / outlet switching mechanism 7 also includes a flipping assembly for rotating the partition plate 4 and the air guide pipe 71 together, and a dynamic sealing assembly for keeping the partition plate 4 and the air guide pipe 71 sealed with the corresponding pipe box 3 when they rotate.

[0032] This design allows for switching between the chambers connected to the inlet flange pipe 5 and the outlet flange pipe 6 simply by flipping the partition plate 4 to change their connection with the air guide pipe 71, effectively improving the convenience of the switching operation.

[0033] It should be noted that the heat exchange component 2 and the dynamic sealing component are mature existing technologies, and will not be elaborated on further here.

[0034] In one embodiment, the flipping assembly includes a rotating rod 72 rotatably disposed within the partition plate 4, with a turntable 73 fixedly disposed at one end of the rotating rod 72 outside the tube box 3, and an eccentric block 74 inserted into the partition plate 4 fixedly disposed at one end of the rotating rod 72 inside the tube box 3.

[0035] With this design, the eccentric block 74 is inserted into the partition plate 4. When the turntable 73 drives the rotating rod 72 to rotate, it is blocked by the eccentric block 74, which drives the partition plate 4 to rotate together.

[0036] In one embodiment, the inlet / outlet switching mechanism 7 is provided with a positioning mechanism 8 for positioning the split partition 4 after it is flipped.

[0037] The positioning mechanism 8 includes a positioning sleeve 81 disposed inside the air duct 71 and movable along the axis of the air duct 71. A lifting rod 82 is provided at one end of the positioning sleeve 81 near the rotating rod 72. A C-shaped sleeve 83 is provided at the end of the lifting rod 82 near the rotating rod 72 and sleeved on the rotating rod 72. The positioning mechanism 8 also includes a lever 84 fixedly disposed on the rotating rod 72 and used to move the C-shaped sleeve 83.

[0038] When the positioning sleeve 81 moves to the extreme position closer to the rotating rod 72, both ends of the positioning sleeve 81 are inside the air guide tube 71. When the positioning sleeve 81 moves to the extreme position away from the rotating rod 72, one end of the positioning sleeve 81 moves outside the air guide tube 71. The dividing plate 4 is provided with an arc-shaped groove for the eccentric block 74 to rotate 90 degrees. The height of the lever block 84 is not less than the maximum length of the positioning sleeve 81 moving outside the air guide tube 71, and the two lever blocks 84 are perpendicular to each other.

[0039] This design causes the rotating rod 72 to rotate first, driving the two levers 84 to rotate. The lower C-shaped sleeve 83 is pushed upward by the corresponding lever 84, overcoming the influence of gravity and fully retracting into the air guide tube 71. Then, the lever 84 on the rotating rod 72 rotates to the limit position of the arc groove, causing the rotating rod 72 to continue rotating and drive the partition plate 4 to flip. After the flip is completed, the lower C-shaped sleeve 83 falls under the action of gravity. If it is aligned with the air outlet flange pipe 6 at this time, it can be inserted into the air outlet flange pipe 6 to complete the positioning of the partition plate 4.

[0040] In one embodiment, a recess is provided in the bottom cavity of the pipe box 3 for inserting and positioning the positioning sleeve 81 in the air guide pipe 71 that is misaligned with the air outlet flange pipe 6.

[0041] This design allows the air guide pipe 71, which is misaligned with the air outlet flange pipe 6, to be inserted into the sink through its internal positioning sleeve 81 when rotated to the lower position, thereby positioning the partition plate 4.

[0042] In one embodiment, a protrusion is provided on the turntable 73, and two stops are provided on the corresponding tube box 3 within the rotation area of ​​the protrusion, for marking the two flip states of the split partition 4.

[0043] This design uses a stop to limit the rotation angle of the protrusion, making it easier for external operators to determine whether the split partition 4 has been flipped to the required position when switching operations, thus further improving operational convenience.

[0044] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0045] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0046] Additionally, "multiple" refers to two or more.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A shell-and-tube heat exchanger, comprising a shell (1) for guiding the flow of outdoor air and a heat exchange assembly (2) for guiding the flow of flue gas, wherein the heat exchange assembly (2) is disposed within the shell (1), characterized in that: Both ends of the housing (1) are detachably provided with tube boxes (3) that are connected to the heat exchange assembly (2). One of the tube boxes (3) is provided with a partition plate (4) for dividing the inner cavity of the tube box (3) into two independent chambers. Correspondingly, the tube box (3) is provided with an inlet flange pipe (5) and an outlet flange pipe (6) that are respectively connected to the two chambers, as well as an inlet / outlet switching mechanism (7) for switching the chambers connected to the inlet flange pipe (5) and the outlet flange pipe (6).

2. The shell-and-tube heat exchanger according to claim 1, characterized in that: The inlet flange pipe (5) and outlet flange pipe (6) are staggered. The inlet and outlet switching mechanism (7) includes two air guide pipes (71) disposed on the partition plate (4) and located in two chambers respectively. The partition plate (4) has through holes that communicate with the air guide pipes (71). The two air guide pipes (71) are respectively connected to the inlet flange pipe (5) and the outlet flange pipe (6). The inlet / outlet air switching mechanism (7) also includes a flipping assembly for rotating the partition plate (4) and the air guide pipe (71) together, and a dynamic sealing assembly for keeping the partition plate (4) and the air guide pipe (71) sealed with the corresponding pipe box (3) when they rotate.

3. A shell-and-tube heat exchanger according to claim 2, characterized in that: The flipping assembly includes a rotating rod (72) rotatably disposed within the partition plate (4), with a turntable (73) fixedly disposed at one end of the rotating rod (72) outside the tube box (3), and an eccentric block (74) fixedly disposed at one end of the rotating rod (72) inside the tube box (3) and inserted into the partition plate (4).

4. A shell-and-tube heat exchanger according to claim 3, characterized in that: The inlet / outlet switching mechanism (7) is provided with a positioning mechanism (8) for positioning the split partition (4) after it is flipped; The positioning mechanism (8) includes a positioning sleeve (81) disposed inside the air duct (71) and movable along the axis of the air duct (71). A lifting rod (82) is provided at one end of the positioning sleeve (81) near the rotating rod (72). A C-shaped sleeve (83) is provided at one end of the lifting rod (82) near the rotating rod (72) and is sleeved on the rotating rod (72). The positioning mechanism (8) also includes a lever (84) fixedly disposed on the rotating rod (72) and used to move the C-shaped sleeve (83). When the positioning sleeve (81) moves to the limit position closer to the rotating rod (72), both ends of the positioning sleeve (81) are inside the air guide pipe (71). When the positioning sleeve (81) moves to the limit position away from the rotating rod (72), one end of the positioning sleeve (81) moves outside the air guide pipe (71). The dividing plate (4) is provided with an arc-shaped groove for the eccentric block (74) to rotate 90 degrees. The height of the lever (84) is not less than the maximum length of the positioning sleeve (81) moving outside the air guide pipe (71), and the two levers (84) are perpendicular to each other.

5. A shell-and-tube heat exchanger according to claim 4, characterized in that: The bottom cavity of the pipe box (3) is provided with a recess for the positioning sleeve (81) in the air guide pipe (71) that is misaligned with the air outlet flange pipe (6) to be inserted and positioned.

6. A shell-and-tube heat exchanger according to claim 4, characterized in that: The turntable (73) is provided with protrusions, and the tube box (3) is provided with two blocks located in the rotation area of ​​the protrusions to mark the two flip states of the partition plate (4).

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