A counterflow high-efficiency air preheater

Abstract

The application belongs to the field of air heat exchange, and particularly relates to a countercurrent high-efficiency air preheater, which comprises a shell, a plate, and a gas flow direction control mechanism. The rear surface of a shell cover is connected with the front surface of the shell through bolts. The inner wall of the shell is fixedly connected with a mounting rod. The outer wall of the mounting rod penetrates the inner wall of the plate. The gas flow direction control mechanism is provided with five groups. Two groups of the gas flow direction control mechanism are arranged on the left and right sides of the plate and are fixedly connected with the inner wall of the shell. Two groups of the gas flow direction control mechanism are arranged below the plate close to the left and right sides. One group of the gas flow direction control mechanism is arranged above the plate close to the right side. The gas flow direction control mechanism is arranged, so that flue gas produced by a heating furnace and clean air can enter the gap position between two plate pieces along the gas distribution groove, and the gas does not need to pass through a multi-process turning bellows, thereby reducing the cost and not affecting the gas flow direction.

Description

Technical Field

[0001] This application belongs to the field of air heat exchange, specifically a counter-current high-efficiency air preheater. Background Technology

[0002] The heating furnace is the main energy-consuming equipment, accounting for more than 60% of the total equipment. Among them, the heat carried away by the flue gas accounts for about 90% of the heat loss of the heating furnace. According to calculations, for every 10°C increase in flue gas temperature, the thermal efficiency of the heating furnace will decrease by 0.42%. The waste heat recovery of flue gas is significant. Therefore, improving the air preheater is particularly important and is an important indicator of energy conservation and emission reduction.

[0003] Currently, in order to ensure that the flue gas from the heating furnace can be effectively recycled and reused, it is often necessary to pass the flue gas into an air preheater so that the flue gas can heat the clean air.

[0004] Currently, existing plate air preheaters are often cross-flow plate-shaped. However, when using this type of preheater, it is often necessary to use a multi-pass turning fan box to make the gas distributed in a staggered manner. However, since the multi-pass turning fan box often occupies a large space, it results in a large heat exchange area and high cost. Therefore, it is necessary to design a counter-flow high-efficiency air preheater to solve the above problems. Utility Model Content

[0005] The purpose of this application is to address the shortcomings of existing technologies by designing a counter-current high-efficiency air preheater that uses a gas flow control mechanism to deliver gas to a designated location. This solves the problem that multi-process turning bellows occupy a large space and result in high costs.

[0006] To achieve the above objectives, the following technical solution is adopted:

[0007] A counter-current high-efficiency air preheater includes a shell, a cover, plates, and a gas flow control mechanism. The rear surface of the cover is bolted to the front surface of the shell. An installation rod is fixedly connected to the inner wall of the shell. The outer wall of the installation rod penetrates the inner wall of the plates. Five sets of gas flow control mechanisms are provided. Two sets of gas flow control mechanisms are located on the left and right sides of the plates and are fixedly connected to the inner wall of the shell. Two sets of gas flow control mechanisms are located below the left and right sides of the plates. One set of gas flow control mechanisms is located above the right side of the plates. The latter three sets of gas flow control mechanisms all penetrate the inner wall of the shell and are fixedly connected to the inner wall of the shell.

[0008] Preferably, the gas flow control mechanism includes a mounting frame, the outer walls of the mounting frames on the left and right sides of the plate are slidably connected to the inner wall of the housing, the outer walls of the three mounting frames on the upper and lower sides of the plate are through and fixedly connected to the inner wall of the housing, the inner wall of the mounting frame is provided with a ventilation groove, the inner wall of the mounting frame near the plate is provided with a gas distribution groove, and the inner wall of the mounting frame away from the plate is through and fixedly connected with a connecting pipe.

[0009] Preferably, a plate positioning assembly is provided on the rear side of the shell cover and on the outside of the mounting frame located on the left and right sides of the plate.

[0010] Preferably, the plate positioning assembly includes a trapezoidal block, the outer wall of which is fixedly connected to one end of the mounting frame near the plate, the front surface of the mounting frame is provided with a control groove, and the rear surface of the cover is fixedly connected with a control rod.

[0011] Preferably, the outer wall of the plate is in contact with the inner wall of the shell, and the front and rear surfaces of the plate are fixedly connected with protrusions.

[0012] Preferably, the projected shape of the trapezoidal block on the lower surface of the housing is an isosceles trapezoid, and the longer base of the trapezoidal block is fixedly connected to the side of the mounting frame near the plate.

[0013] Preferably, the width of the trapezoidal block is the same as the width of the protrusion.

[0014] Preferably, the inner wall of the plate has a circular hole that matches the shape of the mounting rod, and the inner wall of the plate fits against the outer wall of the mounting rod.

[0015] Compared with the prior art, the beneficial effects of this application are:

[0016] 1. This application adopts a gas flow control mechanism, which enables the flue gas and clean air produced by the heating furnace to enter the gap between the two plates along the gas distribution groove, without the gas needing to pass through a multi-pass turning wind box, thus reducing costs and not affecting the gas flow direction.

[0017] 2. This application adopts a trapezoidal block, control slot and control rod configuration to ensure that after the plate is disassembled and cleaned and reinstalled, it can be restored to its original position under the joint action of the trapezoidal block and its side wall, thus ensuring that the equipment can be used stably for a long time. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure in this application;

[0019] Figure 2 This is an exploded view of this application;

[0020] Figure 3 This is a cross-sectional view of the present application;

[0021] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0022] Figure 5 This is a top sectional view of this application;

[0023] Figure 6 for Figure 5 Enlarged view of point B in the middle;

[0024] Figure 7 This is a side sectional view of the present application;

[0025] Figure 8 This is a schematic diagram of the structure of the plate and mounting rod in this application.

[0026] The components are: 1. Housing; 2. Housing cover; 3. Plate; 4. Gas flow control mechanism; 5. Mounting rod; 6. Protrusion; 41. Mounting frame; 42. Ventilation groove; 43. Gas distribution groove; 44. Connecting pipe; 45. Plate positioning assembly; 451. Trapezoidal block; 452. Control groove; 453. Control rod. Detailed Implementation

[0027] Reference Figures 1-8 A counter-current high-efficiency air preheater includes a shell 1, a cover 2, plates 3, and a gas flow control mechanism 4. The gas flow control mechanism 4 is used to control the flow direction of flue gas and clean air entering the shell 1. The rear surface of the cover 2 is bolted to the front surface of the shell 1. The bolted connection ensures that the cover 2 and the shell 1 can be connected to each other and also separated. The inner wall of the shell 1 is fixedly connected with four mounting rods 5. The outer wall of the mounting rods 5 penetrates the inner wall of the plates 3. The four mounting rods 5 are respectively located near the four corners of the plates 3. The gas flow control mechanism 4 is provided in five sets. Two sets of gas flow control mechanisms 4 are located on the left and right sides of the plates 3 and are fixedly connected to the inner wall of the shell 1. Two sets of gas flow control mechanisms 4 are located below the left and right sides of the plates 3. One set of gas flow control mechanisms 4 is located above the right side of the plates 3. The latter three sets of gas flow control mechanisms 4 all penetrate the inner wall of the shell 1 and are fixedly connected to the inner wall of the shell 1.

[0028] In this embodiment, during use, the operator selects the gas flow control mechanism 4 for gas access according to the required gas flow direction;

[0029] When the flue gas enters through the lower left gas flow control mechanism 4, it enters the position between the two plates 3 along the lower left gas flow control mechanism 4 and leaves the housing 1 through the lower right gas flow control mechanism 4. At the same time, clean air enters the housing 1 through the upper right gas flow control mechanism 4 and leaves the housing 1 through the left gas flow control mechanism 4. Therefore, when between the two plates 3, the clean air and the flue gas move in opposite directions, achieving a convective heat transfer effect.

[0030] When the flue gas enters the housing 1 through the lower right gas flow control mechanism 4, it enters the position between the two plates 3 along the lower right gas flow control mechanism 4 and leaves the housing 1 through the lower left gas flow control mechanism 4. At this time, clean air enters the housing 1 through the left gas flow control mechanism 4 and moves from right to left between the two plates 3 where the flue gas is located. It leaves the housing 1 through the left gas flow control mechanism 4. Therefore, the clean air and the flue gas still move in opposite directions, achieving the effect of convective heat transfer.

[0031] As a preferred embodiment, the gas flow control mechanism 4 includes a mounting frame 41, which is square in shape. The outer walls of the mounting frames 41 on the left and right sides of the plate 3 are slidably connected to the inner wall of the housing 1. The outer walls of the three mounting frames 41 on the upper and lower sides of the plate 3 are through and fixedly connected to the inner wall of the housing 1. The inner wall of the mounting frame 41 is provided with a ventilation groove 42, which is used to make the external gas move evenly to the inlet of the gas distribution groove 43. The inner wall of the mounting frame 41 near the plate 3 is provided with a gas distribution groove 43, and the inner wall of the mounting frame 41 away from the plate 3 is through and fixedly connected with a connecting pipe 44. The outside of the connecting pipe 44 is provided with a flange that connects to an external pipeline, and the inside of the connecting pipe 44 is provided with a valve that controls its opening and closing. When the gas enters the mounting frame 41 along the connecting pipe 44, it first enters the inside of the ventilation groove 42, and then enters the position between the two plates 3 along the gas distribution groove 43.

[0032] As a preferred embodiment, a plate positioning assembly 45 is provided on the rear side of the cover 2 and the exterior of the mounting frame 41 located on the left and right sides of the plate 3. The plate positioning assembly 45 is used to ensure that the plate 3 can be moved to its original position after disassembly and installation.

[0033] As a preferred embodiment, the plate positioning assembly 45 includes a trapezoidal block 451. The outer wall of the trapezoidal block 451 is fixedly connected to the end of the mounting frame 41 near the plate 3. A control groove 452 is formed on the front surface of the mounting frame 41. The projection shape of the control groove 452 onto the lower surface of the housing 1 is a right trapezoid, and the rear end of the control groove 452 near the plate 3 is set as an inclined surface. A control rod 453 is fixedly connected to the rear surface of the cover 2. The control rod 453 and the control groove 452 are at the same height. When the cover 2 is removed, and the plate 3 is moved forward along the outer wall of the mounting rod 5 for removal, the inclined surface of the trapezoidal block 451 can be pushed to make the mounting frames 41 on the left and right sides of the plate 3 move towards the distance. The plate 3 is moved away from the plate 3. After disassembly, the staff can easily clean the stains adhering to its surface. After cleaning and reinstallation, the staff first installs the plates 3 on the outside of the mounting rod 5 in sequence, and then installs the cover 2. During the installation of the cover 2, the cover 2 moves backward, driving the control rod 453 to move in the direction of entering the control groove 452. This causes the control rod 453 to push the inclined surface of the control groove 452, thereby causing the mounting frame 41 to move closer to the plate 3. This allows the trapezoidal block 451 to enter the position between the two plates 3, thereby positioning the plate 3 and ensuring that the plate 3 is still in its original position after reinstallation.

[0034] As a preferred method, the outer wall of the plate 3 is in contact with the inner wall of the shell 1, and the front and rear surfaces of the plate 3 are fixedly connected with protrusions 6. The protrusions 6 are cylindrical in shape. By setting the protrusions 6, the distance between the two plates 3 is fixed, and when the airflow is very low, turbulence can be achieved due to the contact between the gas and the outer circumferential surface of the protrusions 6.

[0035] As a preferred method, the projected shape of the trapezoidal block 451 on the lower surface of the housing 1 is an isosceles trapezoid. By setting the shape of the trapezoidal block 451, it is ensured that when there is a distance between it and the plate 3, it moves towards the plate 3. Its shorter base can smoothly enter the position between the two plates 3, and the longer base of the trapezoidal block 451 is fixedly connected to the side of the mounting frame 41 near the plate 3.

[0036] As a preferred approach, the width of the trapezoidal block 451 is the same as the width of the protrusion 6. By ensuring that the widths are the same, it is guaranteed that the trapezoidal block 451 can fit precisely between the two plates 3.

[0037] As a preferred method, the inner wall of the plate 3 is provided with a round hole that fits the shape of the mounting rod 5. The round hole ensures that the plate 3 can be smoothly installed on the outer wall of the mounting rod 5, and the inner wall of the plate 3 fits against the outer wall of the mounting rod 5. The fit ensures that the gas between the two plates 3 does not easily flow between them along the gap between the plate 3 and the mounting rod 5.

Claims

1. A counter-current high-efficiency air preheater, characterized in that, The device includes a housing (1), a cover (2), a plate (3), and a gas flow control mechanism (4). The rear surface of the cover (2) is connected to the front surface of the housing (1) by bolts. An installation rod (5) is fixedly connected to the inner wall of the housing (1). The outer wall of the installation rod (5) penetrates the inner wall of the plate (3). Five sets of gas flow control mechanisms (4) are provided. Two sets of gas flow control mechanisms (4) are located on the left and right sides of the plate (3) and are fixedly connected to the inner wall of the housing (1). Two sets of gas flow control mechanisms (4) are located below the left and right sides of the plate (3). One set of gas flow control mechanisms (4) is located above the right side of the plate (3). The latter three sets of gas flow control mechanisms (4) penetrate the inner wall of the housing (1) and are fixedly connected to the inner wall of the housing (1).

2. The counter-current high-efficiency air preheater according to claim 1, characterized in that, The gas flow control mechanism (4) includes a mounting frame (41). The outer walls of the mounting frames (41) on the left and right sides of the plate (3) are slidably connected to the inner wall of the housing (1). The outer walls of the three mounting frames (41) on the upper and lower sides of the plate (3) are through and fixedly connected to the inner wall of the housing (1). The inner wall of the mounting frame (41) is provided with a ventilation groove (42). The inner wall of the mounting frame (41) on the side closer to the plate (3) is provided with a gas distribution groove (43). The inner wall of the mounting frame (41) on the side away from the plate (3) is through and fixedly connected with a connecting pipe (44).

3. A counter-current high-efficiency air preheater according to claim 2, characterized in that, The rear side of the shell cover (2) and the exterior of the mounting frame (41) located on the left and right sides of the plate (3) are provided with a plate positioning assembly (45).

4. A counter-current high-efficiency air preheater according to claim 3, characterized in that, The plate positioning assembly (45) includes a trapezoidal block (451), the outer wall of which is fixedly connected to one end of the mounting frame (41) near the plate (3), the front surface of the mounting frame (41) is provided with a control groove (452), and the rear surface of the cover (2) is fixedly connected with a control rod (453).

5. A counter-current high-efficiency air preheater according to claim 1, characterized in that, The outer wall of the plate (3) is in contact with the inner wall of the shell (1), and the front and rear surfaces of the plate (3) are fixedly connected with protrusions (6).

6. A counter-current high-efficiency air preheater according to claim 4, characterized in that, The projected shape of the trapezoidal block (451) on the lower surface of the housing (1) is an isosceles trapezoid, and the longer base of the trapezoidal block (451) is fixedly connected to the side of the mounting frame (41) near the plate (3).

7. A counter-current high-efficiency air preheater according to claim 4, characterized in that, The width of the trapezoidal block (451) is the same as the width of the protrusion (6).

8. A counter-current high-efficiency air preheater according to claim 1, characterized in that, The inner wall of the plate (3) is provided with a round hole that matches the shape of the mounting rod (5), and the inner wall of the plate (3) is in contact with the outer wall of the mounting rod (5).

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