Flue gas waste heat recovery plate type heat exchanger

Abstract

The utility model discloses a flue gas waste heat recovery plate-type heat exchanger which comprises a plate-type heat exchanger body, a liquid inlet pipe and a flue gas outlet pipe are respectively arranged above an end plate of the plate-type heat exchanger body, and a liquid discharge pipe and a flue gas inlet mechanism are respectively arranged below the end plate of the plate-type heat exchanger body. A smoke inlet pipe is arranged on the smoke inlet mechanism, a pressure relief pipe is fixedly arranged on the outer side of the circumference of the smoke inlet pipe, a pressurizing seat is arranged on the inner wall of the circumference in the pressure relief pipe, a mounting groove is formed in the top of the pressure relief pipe, a pressure relief piece covers the interior of the mounting groove, a pressing ring covers the surface of the pressure relief piece, and a safety cover covers the top of the pressing ring. According to the flue gas waste heat recovery plate-type heat exchanger, the situation that metal plates in the plate-type heat exchanger body are damaged due to the fact that pressure borne by the metal plates is too large is avoided; and excessive pressure is released, so that the problems of deformation and fracture of plates in the plate heat exchanger body, damage of sealing pieces, looseness of connecting parts and the like caused by pressure building are avoided, and the service life of equipment is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of heat exchangers, specifically a plate heat exchanger for flue gas waste heat recovery. Background Technology

[0002] A plate heat exchanger is a type of heat exchanger consisting of a series of corrugated metal plates stacked together. Thin rectangular channels are formed between the plates, through which heat exchange occurs. The plate heat exchanger includes frame plates on both sides, heat exchanger plates between adjacent frame plates, tightening screws that penetrate the frame plates and are located on both sides of the heat exchanger plates, an upper guide rod that penetrates the frame plates and is located at the top of the heat exchanger plates, and a lower guide rod that penetrates the frame plates and is located at the bottom of the heat exchanger plates. The heat exchanger plates are fitted onto the upper and lower guide rods and slide along the length of the upper and lower guide rods.

[0003] Regarding the patent for plate heat exchangers, after searching, publication number CN117516247A discloses a support device for a plate heat exchanger and a plate heat exchanger. The document includes a base, on which a vertical plate, a crossbar, and a shock-absorbing component are provided; the bottom of the vertical plate is slidably connected to the base, the top of the vertical plate is fixedly connected to one end of the crossbar, and the end of the crossbar away from the vertical plate is cantilevered towards the center line of the base.

[0004] While the aforementioned device can resist the movement of the pusher plate by using air within the cavity, thus mitigating vibration in the plate heat exchanger, in actual use, the heat exchange fluid often contains impurities such as dust and sand. After long-term operation, these impurities may accumulate in narrow channels or corners inside the heat exchanger, reducing the cross-sectional area of ​​the flow channel and increasing fluid resistance, leading to pressure buildup. Pressure buildup can cause the pressure on the plates to exceed the design value, resulting in plate deformation. Long-term or severe pressure buildup may cause the plates to crack, damaging the structural integrity of the plate heat exchanger, causing leakage between hot and cold fluids, affecting the heat exchange effect, and even causing the equipment to be scrapped, thus reducing the service life of the equipment. Utility Model Content

[0005] The purpose of this invention is to provide a flue gas waste heat recovery plate heat exchanger to solve the defects mentioned in the background art.

[0006] To achieve the above objectives, a flue gas waste heat recovery plate heat exchanger is provided, comprising a plate heat exchanger body. An inlet pipe and a flue gas outlet pipe are respectively installed above the end plates of the plate heat exchanger body. A drain pipe and a flue gas inlet mechanism are respectively installed below the end plates of the plate heat exchanger body. A flue gas inlet pipe is provided on the flue gas inlet mechanism. A pressure relief pipe is fixedly installed on the outer circumference of the flue gas inlet pipe. A pressure boosting seat is provided on the inner circumference of the pressure relief pipe. An installation groove is opened at the top of the pressure relief pipe. A pressure relief plate is covered inside the installation groove. A pressure ring is covered on the surface of the pressure relief plate. A safety cover is covered on the top of the pressure ring. A positioning seat is fixedly installed at the end of the flue gas inlet pipe. A filter cartridge is installed inside the positioning seat.

[0007] Furthermore, the flue gas inlet mechanism includes a flue gas inlet pipe, a pressure relief pipe, a pressure boosting seat, a pressure boosting channel, a pressure relief plate, a pressure ring, a locking bolt, a support column, a safety cover, and a positioning seat. The pressure boosting seat inside the pressure relief pipe has an isosceles trapezoidal cross section, and a pressure boosting channel is provided inside the pressure boosting seat.

[0008] Furthermore, the pressure boosting channel is wider at the bottom and narrower at the top, with the top of the pressure boosting channel positioned opposite the pressure relief plate. The pressure relief plate and the pressure ring are concentric circles, and the pressure ring covers the surface of the pressure relief plate and is fixed by multiple sets of locking bolts.

[0009] Furthermore, the pressure relief plate includes a mounting ring and an impact weak point, the impact weak point being arranged in a quincunx shape, and the depth of the impact weak point being equal to half the thickness of the pressure relief plate.

[0010] Furthermore, a baffle is fixedly installed at the bottom of the safety cover, a deceleration cover is installed at the bottom of the baffle, a cone-shaped tip is fixedly connected to the top of the baffle, and the bottom of the baffle extends into the interior of the deceleration cover.

[0011] Furthermore, the deceleration cover is fixedly installed on the upper circumferential outer wall surface of the pressure relief pipe; the end face of the deceleration cover is "L" shaped, and multiple sets of support columns are fixedly installed inside the safety cover, with the bottom of the support columns fixedly connected to the surface of the pressure ring.

[0012] Furthermore, five sets of positioning grooves are evenly provided on the inner circumference of the positioning seat, and five sets of positioning blocks are evenly provided on the outer circumference of the end of the filter cylinder. The positioning blocks are adapted to the size of the positioning grooves, and the positioning blocks are inserted into the inside of the positioning grooves and fixed by bolts.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This utility model addresses the issue of pressure buildup caused by blockage inside the plate heat exchanger. When this blockage occurs, the flue gas entering the flue gas inlet pipe impacts the inside of the pressure relief pipe and, through the pressure booster seat, impacts the pressure relief plate. The pressure relief plate has a weak impact port at its bottom. Once this weak port is breached, pressure is released from the flue gas inlet pipe and the inside of the plate heat exchanger, preventing excessive pressure on the metal plates inside the plate heat exchanger and thus avoiding damage. This releases excess pressure, preventing deformation and cracking of the plates inside the plate heat exchanger, as well as damage to seals and loosening of connecting parts, thus extending the equipment's service life.

[0015] 2. In this utility model, the filter cartridge is screwed onto the positioning seat via the positioning groove and the top of the positioning block. Before the gas enters the interior of the plate heat exchanger body, it can undergo preliminary filtration through the filter cartridge. Flue gas often contains impurities such as dust and particles. The filter cartridge can intercept these impurities, preventing them from entering the heat exchanger with the flue gas, thus preventing impurities from causing wear on the plates, flow channels and other components of the plate heat exchanger, and further extending the service life of the equipment. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a front view schematic diagram of the structure of this utility model;

[0018] Figure 2 for Figure 1 A bottom view;

[0019] Figure 3 for Figure 1 Top view;

[0020] Figure 4 This is a schematic diagram of the flue gas inlet mechanism in this utility model;

[0021] Figure 5 A bottom view of the flue gas inlet mechanism;

[0022] Figure 6 This is a top view of the flue gas inlet mechanism;

[0023] Figure 7 This is a schematic diagram of the pressure relief plate in this utility model;

[0024] Figure 8 This is a cross-sectional view of the pressure relief plate of this utility model.

[0025] The following are the labeling elements in the diagram: 1. Plate heat exchanger body; 2. Liquid inlet pipe; 3. Liquid outlet pipe; 4. Flue gas outlet pipe; 5. Flue gas inlet mechanism; 50. Flue gas inlet pipe; 51. Pressure relief pipe; 52. Pressure boosting seat; 53. Pressure boosting channel; 54. Pressure relief plate; 541. Mounting ring; 542. Impact weak point; 55. Pressure ring; 56. Locking bolt; 57. Support column; 58. Safety cover; 581. Tip; 582. Baffle; 583. Deceleration cover; 59. Positioning seat; 591. Filter cartridge; 592. Positioning groove; 593. Positioning block. Detailed Implementation

[0026] 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 some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] 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.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] 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 technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, 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. When 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.

[0030] Please see Figure 1-8 This utility model provides a plate heat exchanger for flue gas waste heat recovery, including a plate heat exchanger body 1. An inlet pipe 2 and a flue gas outlet pipe 4 are respectively installed on the upper end plate of the plate heat exchanger body 1. A drain pipe 3 and a flue gas inlet mechanism 5 are respectively installed on the lower end plate of the plate heat exchanger body 1. A flue gas inlet pipe 50 is provided on the flue gas inlet mechanism 5. A pressure relief pipe 51 is fixedly provided on the outer circumference of the flue gas inlet pipe 50. A pressure boosting seat 52 is provided on the inner circumference of the pressure relief pipe 51. An installation groove is opened at the top of the pressure relief pipe 51. A pressure relief plate 54 is covered inside the installation groove. A pressure ring 55 is covered on the surface of the pressure relief plate 54. A safety cover 58 is covered on the top of the pressure ring 55. A positioning seat 59 is fixedly provided at the end of the flue gas inlet pipe 50. A filter cylinder 591 is provided inside the positioning seat 59.

[0031] Working Principle: In actual use, the plate heat exchanger body 1 is assembled from many stamped metal plates, with corrugations or other special shapes on the plates. Narrow flow channels are formed between the plates, and the flow channels of adjacent plates are isolated from each other, respectively for the flow of high-temperature flue gas and low-temperature medium. The plates are usually made of materials with good thermal conductivity, such as stainless steel, to ensure efficient heat transfer. When high-temperature flue gas enters one side of the flow channel of the plate heat exchanger through the flue gas inlet mechanism 5, the heat in the flue gas is first transferred to the metal plates in contact with the flue gas through heat conduction. Due to the good thermal conductivity of metal, the heat will quickly diffuse within the plates. In the flow channel on the other side of the plates, the low-temperature medium, such as..., flows at a certain flow rate; through thermal convection... The heat on the plates is transferred to the low-temperature medium, raising its temperature; thus achieving the purpose of recovering waste heat from the flue gas. When the flue gas enters the plate heat exchanger body 1, if a blockage occurs inside the plate heat exchanger body 1, causing pressure buildup, the flue gas entering the flue gas inlet pipe 50 impacts the inside of the pressure relief pipe 51 and, through the pressure boosting seat 52, impacts the pressure relief plate 54. The bottom of the pressure relief plate 54 is provided with a weak impact port 542, which is arranged in a quincunx shape. After the weak impact port 542 is broken, pressure relief can be performed on the flue gas inlet pipe 50 and the inside of the plate heat exchanger body 1, preventing excessive pressure on the metal plates inside the plate heat exchanger body 1 and causing damage; releasing excess pressure. To prevent deformation and cracking of the internal plates of the plate heat exchanger body 1 due to pressure buildup, as well as damage to seals and loosening of connecting parts, thus extending the service life of the equipment; the high-temperature gas released through the pressure relief plate 54 impacts the safety cover 58 and enters the deceleration cover 583 for deceleration; this prevents the high-temperature gas from being directly sprayed into the surrounding environment, avoiding burns to nearby operators or maintenance personnel due to accidental contact with the high-temperature gas flow, ensuring personnel safety; the gas may have a large impact force during pressure relief, and if it rushes out directly, it may cause impact injury to surrounding personnel; the safety cover 58 and the deceleration cover 583 can change the gas flow direction, buffer the impact force of the gas, and reduce the possibility of such injury; in the flue gas inlet pipe A filter cartridge 591 is installed at the end of 50. The filter cartridge 591 is screwed onto the positioning seat 59 via the positioning groove 592 and the top of the positioning block 593. Before the gas enters the interior of the plate heat exchanger body 1, it can undergo preliminary filtration through the filter cartridge 591. Flue gas often contains impurities such as dust and particles. The filter cartridge 591 can intercept these impurities and prevent them from entering the interior of the heat exchanger with the flue gas. This prevents impurities from causing wear on the plates, flow channels, and other components of the plate heat exchanger and extends the service life of the equipment. After each use of the plate heat exchanger body 1, the filter cartridge 591 and the pressure relief plate 54 need to be disassembled. The filter cartridge 591 should be cleaned and the pressure relief plate 54 should be inspected for cracks to avoid affecting the next use.

[0032] In a preferred embodiment, the flue gas inlet mechanism 5 includes a flue gas inlet pipe 50, a pressure relief pipe 51, a pressure boosting seat 52, a pressure boosting channel 53, a pressure relief plate 54, a pressure ring 55, a locking bolt 56, a support column 57, a safety cover 58, and a positioning seat 59. The pressure boosting seat 52, located above the inside of the pressure relief pipe 51, has an isosceles trapezoidal cross section, and a pressure boosting channel 53 is provided inside the pressure boosting seat 52.

[0033] The pressure boosting channel 53 is wider at the bottom and narrower at the top. The top of the pressure boosting channel 53 is positioned opposite to the pressure relief plate 54. The pressure relief plate 54 and the pressure ring 55 are concentric circles. The pressure ring 55 covers the surface of the pressure relief plate 54 and is fixed by multiple sets of locking bolts 56.

[0034] In a preferred embodiment, the pressure relief plate 54 includes a mounting ring 541 and an impact weak point 542, which is arranged in a quincunx shape and the depth of the impact weak point 542 is equal to half the thickness of the pressure relief plate 54.

[0035] A baffle 582 is fixedly installed at the bottom of the safety cover 58, a deceleration cover 583 is installed at the bottom of the baffle 582, a cone-shaped tip 581 is fixedly connected to the top of the baffle 582, and the bottom of the baffle 582 extends into the interior of the deceleration cover 583.

[0036] In a preferred embodiment, the deceleration cover 583 is fixedly installed on the upper circumferential outer wall surface of the pressure relief pipe 51; the end face of the deceleration cover 583 is "L" shaped, and multiple sets of support columns 57 are fixedly installed inside the safety cover 58, with the bottom of the support columns 57 fixedly connected to the surface of the pressure ring 55.

[0037] Five sets of positioning grooves 592 are evenly provided on the inner circumference of the positioning seat 59, and five sets of positioning blocks 593 are evenly provided on the outer circumference of the end of the filter cylinder 591. The positioning blocks 593 are adapted to the size of the positioning grooves 592, and the positioning blocks 593 are inserted into the interior of the positioning grooves 592 and fixed by bolts.

[0038] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A flue gas heat recovery plate heat exchanger comprising a plate heat exchanger body (1), characterized in that: The end plate of the plate heat exchanger body (1) is respectively provided with a liquid inlet pipe (2) and a flue gas outlet pipe (4), and the end plate of the plate heat exchanger body (1) is respectively provided with a liquid outlet pipe (3) and a flue gas inlet mechanism (5), the flue gas inlet mechanism (5) is provided with a flue gas inlet pipe (50), the outer side of the circumference of the flue gas inlet pipe (50) is fixedly provided with a pressure relief pipe (51), the inner circumferential wall of the pressure relief pipe (51) is provided with a booster seat (52), the top of the pressure relief pipe (51) is provided with a mounting groove, the inside of the mounting groove is covered with a pressure relief piece (54), the surface of the pressure relief piece (54) is covered with a pressure ring (55), the top of the pressure ring (55) is covered with a safety cover (58), the end of the flue gas inlet pipe (50) is fixedly provided with a positioning seat (59), and the inside of the positioning seat (59) is provided with a filter cartridge (591).

2. A flue gas heat recovery plate heat exchanger according to claim 1, characterized in that: The flue gas inlet mechanism (5) comprises a flue gas inlet pipe (50), a pressure relief pipe (51), a booster seat (52), a booster channel (53), a pressure relief piece (54), a pressure ring (55), a locking bolt (56), a support column (57), a safety cover (58) and a positioning seat (59), the booster seat (52) on the inside of the pressure relief pipe (51) is provided with an isosceles trapezoidal section, and the inside of the booster seat (52) is provided with a booster channel (53).

3. A flue gas heat recovery plate heat exchanger according to claim 2, characterized in that: The booster channel (53) is wide at the bottom and narrow at the top, the booster channel (53) is arranged opposite to the pressure relief piece (54) at the top, the pressure relief piece (54) and the pressure ring (55) are concentric structures, the pressure ring (55) covers the surface of the pressure relief piece (54) and is fixedly connected by a plurality of locking bolts (56).

4. A flue gas heat recovery plate heat exchanger according to claim 3, characterized in that: The pressure relief piece (54) comprises a mounting ring (541) and an impact weak port (542), the impact weak port (542) is provided in a quincunx shape, and the depth of the impact weak port (542) is equal to one half of the thickness of the pressure relief piece (54).

5. A flue gas heat recovery plate heat exchanger according to claim 2, characterized in that: The bottom of the safety cover (58) is fixedly provided with a blocking cover (582), the bottom of the blocking cover (582) is provided with a speed reduction cover (583), the top of the blocking cover (582) is fixedly connected with a tapered tip (581), and the bottom of the blocking cover (582) extends into the inside of the speed reduction cover (583).

6. A flue gas heat recovery plate heat exchanger according to claim 5, characterized in that: The speed reduction cover (583) is fixedly arranged on the outer wall surface of the upper part of the pressure relief pipe (51), the end surface of the speed reduction cover (583) is provided in an "L" shape, a plurality of support columns (57) are fixedly arranged in the inside of the safety cover (58), and the bottom of the support column (57) is fixedly connected to the surface of the pressure ring (55).

7. A flue gas heat recovery plate heat exchanger according to claim 2, characterized in that: Five groups of positioning grooves (592) are uniformly arranged on the inner circumferential wall of the positioning seat (59), five groups of positioning blocks (593) are uniformly arranged on the outer side of the end of the filter cartridge (591), the size of the positioning block (593) is matched with the size of the positioning groove (592), the positioning block (593) is inserted into the inside of the positioning groove (592) and is fixed by a bolt.

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