A kind of bulging full-welding detachable plate heat exchanger

Abstract

This invention relates to a detachable, fully welded, bulging plate heat exchanger, belonging to the technical field of heat exchangers. The detachable, bulging plate heat exchanger includes a heat exchange mechanism composed of multiple sets of heat exchange plates. Multiple sets of bulging heat exchange cores are arranged on the heat exchange plates. A flue gas flow channel is provided between adjacent heat exchange plates. A partition plate is arranged within the flue gas flow channel, and a guide gas cavity is provided inside the partition plate. The partition plate is open on the side near the flue gas inlet. A heat exchange flow cavity is formed between the partition plate and the heat exchange plates. A guide gas hole is formed on the side wall of the partition plate near the heat exchange flow cavity. This invention allows the flue gas to be diverted into the heat exchange flow cavity and the guide gas cavity after entering the flue gas flow channel. The flue gas in the heat exchange flow cavity directly contacts the surface of the bulging heat exchange cores for heat exchange and forms turbulence. The flue gas in the guide gas cavity is ejected through the guide gas hole and impacts the turbulent flue gas in the heat exchange flow cavity, ensuring thorough mixing of the heat-exchanged and non-heat-exchanged flue gas.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger technology, and in particular to a drum-type, fully welded, detachable plate heat exchanger. Background Technology

[0002] Plate heat exchangers are widely used in flue gas waste heat recovery, chemical, power, and HVAC fields due to their advantages such as compact structure, high heat transfer efficiency, and convenient maintenance. In flue gas waste heat recovery applications, plate heat exchangers are usually composed of a base shell and multiple sets of heat exchange mechanisms. Flue gas flow channels are formed between adjacent heat exchange plates, and medium flow channels are set inside the bulging heat exchange cores on the heat exchange plates. When the working medium flows through the medium flow channels, it exchanges heat with the high-temperature flue gas in the flue gas flow channels.

[0003] The expanding heat exchange core can increase the heat exchange area and enhance heat exchange. At the same time, it can promote the generation of turbulence in the flue gas in the flue gas flow channel, improve the heat exchange intensity. In addition, the flue gas turbulence has a certain scouring effect on the inner wall of the heat exchange plate, which can reduce the adhesion of dust in the flue gas on the inner wall of the heat exchange plate, which is conducive to maintaining the long-term stable operation of the heat exchanger. In the flue gas flow channel, the heat exchange between the flue gas and the expanded heat exchange core mainly occurs in the near-wall region close to the surface of the expanded heat exchange core. The flue gas in the middle of the flue gas flow channel is farther from the surface of the heat exchange core, and its heat needs to be gradually transferred to the near-wall region through gas turbulence mixing before it can effectively exchange heat with the heat exchange core. The turbulence disturbance generated by the expanded heat exchange core structure alone has a limited mixing effect on the flue gas in the middle of the flue gas flow channel, resulting in a large radial temperature gradient in the flue gas flow channel, insufficient heat exchange of the flue gas in the middle, and difficulty in further improving the overall heat exchange efficiency. Meanwhile, the dust and other solid particles carried in the flue gas will resist the flow of the flue gas and affect the gas flow rate when they flow in the flue gas duct. During the flow, the particles will also wear the surface of the bulging heat exchange core and heat exchange plate. Existing technology usually installs a filter device at the flue gas inlet for preliminary dust removal, but due to the limitations of filtration accuracy and installation space, some fine dust will still enter the flue gas duct with the flue gas, affecting the life of the heat exchanger. Summary of the Invention

[0004] Therefore, it is necessary to provide a drum-type, fully welded, detachable plate heat exchanger to address the aforementioned technical problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A fully welded, detachable plate heat exchanger includes a heat exchange mechanism composed of multiple heat exchange plates. Multiple sets of expanded heat exchange cores are arranged on the heat exchange plates. A flue gas flow channel is provided between two adjacent heat exchange plates. A partition plate is provided within the flue gas flow channel. An air guide cavity is provided inside the partition plate. The partition plate is open on the side near the flue gas inlet. The space between the partition plate and the heat exchange plates forms a heat exchange flow cavity. Air guide holes are formed on the side wall of the partition plate near the heat exchange flow cavity.

[0006] Preferably, the diameter of the air guide hole located at the flue gas inlet end is larger than that of the air guide hole located at the flue gas outlet end.

[0007] Preferably, the air guide hole is located where the distance between the bulging heat exchange cores on two adjacent heat exchange plates gradually increases.

[0008] Furthermore, a baffle plate is provided on the side of the air guide hole near the flue gas inlet.

[0009] Furthermore, the air guide baffle is arranged in an arc shape.

[0010] Preferably, the airflow cavity is provided with multiple sets of airflow guides, and an airflow channel is provided between two adjacent airflow guides, with the airflow hole connected to the airflow channel.

[0011] Furthermore, the flow guide is provided with an interception hole, which is opened in the middle of one side of the flow guide, and the cavity enclosed by the flow guide is a temporary storage cavity.

[0012] Furthermore, an interception protrusion is provided on the flow guide, the interception protrusion protruding in the direction of flue gas flow.

[0013] Furthermore, the flow guide frame is provided with a cross-shaped material catcher plate, which is used to divide the temporary storage chamber into four separate sub-chambers.

[0014] Preferably, it also includes a base shell, and multiple sets of the heat exchange mechanisms are provided and installed on the base shell; wherein adjacent sets of the heat exchange mechanisms are staggered.

[0015] Compared with the prior art, the present invention provides a drum-type, fully welded, detachable plate heat exchanger, which has the following advantages: This invention incorporates a partition substrate within the flue gas flow channel, causing the flue gas to be diverted into a heat exchange cavity and a guide flow cavity after entering the channel. The flue gas in the heat exchange cavity directly contacts the surface of the bulging heat exchange core for heat exchange and forms turbulence. The flue gas in the guide flow cavity is ejected through the guide holes and impacts the turbulent flue gas in the heat exchange cavity, ensuring thorough mixing between the heat-exchanged and non-heat-exchanged flue gas. This significantly improves the mixing degree between the flue gas in the middle of the flow channel and the near-wall region, effectively solving the problem of insufficient heat exchange in the middle of the flow channel in the prior art and improving the overall heat exchange efficiency.

[0016] Under the negative pressure at the suction end of the flue gas flow channel, the flue gas in the heat exchange flow cavity is blocked by the partition plate and will not directly enter the guide flow cavity. The flue gas maintains a turbulent state in the heat exchange flow cavity and continues to flow along the surface of the bulging heat exchange core. The turbulent mixing distance is shorter, the contact frequency with the bulging heat exchange core is higher, and the heat exchange time is longer, which improves the heat exchange integrity of the flue gas in the heat exchange flow cavity.

[0017] This invention achieves a more efficient heat exchange process by making the diameter of the air guide hole at the flue gas inlet larger than that at the flue gas outlet. This results in a larger volume of flue gas entering the heat exchange cavity at the inlet, which flows along the entire cavity and participates in heat exchange for a longer period. Meanwhile, the smaller diameter of the air guide hole at the outlet leads to a higher exhaust velocity and stronger turbulent disturbance in the outlet region. This creates a heat exchange regulation system in the flue gas flow channel that prioritizes extending the heat exchange time in the initial stage and enhancing turbulent mixing in the later stage, resulting in a more rational distribution of heat exchange intensity throughout the flow channel.

[0018] This invention features interception holes on the flow guide frame, forming a temporary storage chamber within the cavity. When dust-laden flue gas flows through the interception holes in the flow guide channel, dust particles are intercepted by inertia and temporarily stored in the temporary storage chamber, thus achieving online dust removal of the flue gas inside the heat exchanger. When the intercepted flue gas is discharged through the air guide hole, it experiences less dust resistance and a longer spray impact distance, which is beneficial for enhanced mixing.

[0019] In this invention, two adjacent heat exchange mechanisms are staggered. The flue gas in the middle of the first flue gas flow channel enters the side of the second flue gas flow channel and directly contacts the bulging heat exchange core in the second flue gas flow channel for heat exchange. This allows the flue gas in the middle of the first flue gas flow channel that has not been fully heat-exchanged to have a secondary heat exchange opportunity, breaking the inertia of the flue gas always flowing along the middle of the flow channel. This makes the heat exchange of each stage more balanced when the multi-stage heat exchange mechanism is used in series. At the same time, the design of the partition plate and the air guide hole, which is larger at the front and smaller at the back, works together to generate stronger turbulent mixing in the small-diameter air guide hole at the flue gas outlet end. The temperature distribution of the flue gas entering the second flue gas flow channel is more uniform, and the temperature of the flue gas entering the heat exchange flow cavity and the air guide flow cavity is closer. This reduces the temperature difference gradient along the radial direction and along the friction of the heat exchange plate, reduces the thermal stress caused by local overheating or overcooling, and improves the safety and stability of the heat exchanger operation. Attached Figure Description

[0020] Figure 1This is the front view of the present invention; Figure 2 This is a top view of the present invention; Figure 3 This is a side view of the present invention; Figure 4 This is an isometric view of the present invention; Figure 5 This is a schematic diagram of the staggered arrangement of heat exchange mechanisms in this invention; Figure 6 This is a cross-sectional view showing the staggered arrangement of heat exchange mechanisms in this invention; Figure 7 For the present invention Figure 6 Enlarged view of section A in the middle; Figure 8 This is a schematic diagram of the structure when two adjacent heat exchange plates are separated in this invention; Figure 9 This is a cross-sectional view of the separator substrate in this invention; Figure 10 This is a schematic diagram of the structure of the drum-type heat exchanger core in this invention; Figure 11 This is a schematic diagram of the flow guide frame in this invention; Figure 12 For the present invention Figure 11 Enlarged view of section B; Figure 13 This is a schematic diagram of the air guide baffle in this invention; Figure 14 For the present invention Figure 13 Enlarged view of section C.

[0021] In the diagram: 1. Base shell; 101. Medium circulation pipe; 102. Flue gas flow channel; 2. Heat exchange mechanism; 201. Expansion heat exchange core; 202. Medium flow channel; 203. Mounting base plate; 3. Separating base plate; 301. Heat exchange flow cavity; 302. Air guide cavity; 303. Air guide hole; 304. Air guide baffle; 4. Flow guide frame; 401. Air guide channel; 402. Interception hole; 403. Interception protrusion; 404. Material catcher plate. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0023] Example: A type of expanded, fully welded, detachable plate heat exchanger, as described in reference... Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 10 The system includes a base shell 1, within which multiple heat exchange mechanisms 2 are installed. Each heat exchange mechanism 2 consists of multiple interconnected heat exchange plates, which are assembled together by mounting bolts. A mounting base plate 203 is mounted on each heat exchange plate, and the mounting base plate 203 is used to assemble the heat exchange mechanisms 2 onto the base shell 1 by mounting bolts. Multiple sets of expanding heat exchange cores 201 are provided on the heat exchange plates. A flue gas flow channel 102 is provided between adjacent heat exchange plates, through which flue gas for heat exchange flows. A medium flow channel 202 is provided within each expanding heat exchange core 201, through which a working medium flows. The medium includes substances such as water and refrigerant. The base shell 1 is equipped with a medium circulation pipe 101 for connecting and circulating multiple medium flow channels 202. One end of the base shell 1 is connected to a flue gas port, and the other end is pumped by a suction pump. When the flue gas flows into the flue gas flow channel 102 inside the base shell 1, it exchanges heat with the working medium in the medium flow channel 202. The distance between the bulging heat exchange cores 201 on two adjacent heat exchange plates alternately increases and decreases, which can increase the heat exchange area of ​​the bulging heat exchange cores 201 and promote the turbulence of the flue gas in the flue gas flow channel 102, reducing the dust in the flue gas adhering to the inner wall of the heat exchange plate.

[0024] In the flue gas flow channel 102, heat exchange between the flue gas and the expanded heat exchange core 201 mainly occurs in the near-wall region close to the surface of the expanded heat exchange core 201. However, the flue gas located in the middle of the flue gas flow channel 102 is farther from the heat exchange core surface, and its heat needs to be transferred to the near-wall region through gas turbulence mixing before it can effectively exchange heat with the heat exchange core. However, the turbulence disturbance generated by the existing expanded heat exchange core 201 has a limited mixing effect on the middle of the flue gas flow channel 102, resulting in a large radial temperature gradient in the flow channel and insufficient heat exchange of the flue gas in the middle. Therefore, the overall heat exchange efficiency still has room for further improvement. Therefore, referring to... Figure 8 and Figure 9 , Figure 9 The blank arrows in the diagram indicate the direction of flue gas flow. A partition substrate 3 is provided in the flue gas flow channel 102 between the two heat exchange plates. The partition substrate 3 is mounted on the mounting substrate 203. The partition substrate 3 has a guide air flow cavity 302 inside, and the partition substrate 3 is open near the flue gas inlet. There is a heat exchange flow cavity 301 between the partition substrate 3 and the heat exchange plate. A guide air hole 303 is provided on the side wall of the partition substrate 3 near the heat exchange flow cavity 301.

[0025] When suction is performed at the suction end of the flue gas flow channel 102, the heat exchange cavity 301 will be under negative pressure. The flue gas entering the flue gas flow channel 102 will be split under negative pressure. Most of the flue gas will enter the heat exchange cavity 301, and a small portion of the flue gas will enter the guide flow cavity 302. The flue gas in the heat exchange cavity 301 will exchange heat and form turbulence when it comes into contact with the bulging heat exchange core 201. When the flue gas in the guide flow cavity 302 passes through the guide hole 303, due to the small diameter of the guide hole 303 and its high flow velocity, the flue gas in the guide flow cavity 302 will impact the turbulent flue gas in the heat exchange cavity 301 when it is discharged from the guide hole 303. This will cause the flue gas in the heat exchange cavity 301 to mix with the flue gas discharged from the guide flow cavity 302 through the guide hole 303, and promote the turbulence of the flue gas. This will make the mixing of the heat-exchanged flue gas and the non-heat-exchanged flue gas more complete and improve the heat exchange efficiency.

[0026] Secondly, under the negative pressure at the suction end of the flue gas flow channel 102, the turbulent gas in the heat exchange cavity 301 is blocked by the partition plate 3 and will not directly enter the middle of the flue gas flow channel 102, i.e., the guide air flow cavity 302. Moreover, the turbulent mixing distance of the flue gas in the heat exchange cavity 301 is shorter, and the contact frequency with the bulging heat exchange core 201 is higher, which makes the heat exchange time between the flue gas in the heat exchange cavity 301 and the bulging heat exchange core 201 longer.

[0027] In one specific embodiment, in a single partition substrate 3, the diameter of the air guide hole 303 located at the flue gas inlet end is larger than that of the air guide hole 303 located at the flue gas outlet end, so that the flue gas content entering the heat exchange flow cavity 301 through the air guide hole 303 at the flue gas inlet is greater. This part of the flue gas participates in heat exchange in the heat exchange flow cavity 301 for a longer time and has a better heat exchange effect. Meanwhile, the diameter of the air guide hole 303 located at the flue gas outlet end is smaller, which has a better turbulence effect on the flue gas.

[0028] In one specific implementation, refer to Figure 9 The air guide hole 303 is located where the distance between the bulging heat exchange cores 201 on two adjacent heat exchange plates increases. As the flue gas flows from the distance increasing to the distance decreasing, the flue gas velocity increases, resulting in a stronger impact force and more thorough mixing between the flue gas in the heat exchange cavity 301 and the flue gas flowing out of the air guide hole 303.

[0029] In one specific implementation, refer to Figure 13 , Figure 14 A baffle 304 is provided on the side of the air guide hole 303 near the flue gas inlet. The baffle 304 can reduce the flue gas flow cross section and promote the flue gas flow rate. At the same time, it can block the flue gas discharge from the air guide hole 303 and extend the impact stroke of the air flow in the air guide hole 303. This allows the flue gas in the air guide hole 303 to impact the part with larger spacing when impacting, and promotes the flue gas to quickly adhere to the wall surface of the expansion heat exchange core 201 when the spacing changes from small to large.

[0030] Among them, reference Figure 14 The air guide baffle 304 is arc-shaped, which can guide the flue gas to both sides and mix it with the adjacent flue gas to promote the uniformity of flue gas temperature.

[0031] In one specific implementation, refer to Figure 11 and Figure 12 , Figure 12 The blank arrows in the middle indicate the direction of flue gas flow. Multiple sets of guide frames 4 are provided in the airflow cavity 302. A guide channel 401 is provided between two adjacent guide frames 4. The air guide hole 303 is connected in the airflow channel 401. Through the provided airflow channel 401, the free diffusion of flue gas in the airflow cavity 302 can be reduced, the flow path of flue gas can be shortened, and the flow velocity of the air guide hole 303 located at the flue gas inlet end can be increased.

[0032] Among them, the flow guide 4 is arranged in a rhombus shape. Along the flue gas flow direction, the tip of the rhombus flow guide 4 faces the flue gas flow direction, so that the flue gas is split along both sides of the flow guide 4 and discharged from the adjacent air guide hole 303. The flow path between two adjacent air guide holes 303 is the shortest.

[0033] In one specific embodiment, although the dust and other solid particles in the flue gas are not easily attached to the bulging heat exchange core 201 due to the influence of turbulence in the flue gas flow channel 102, the dust and other solid particles in the flue gas will flow with the flue gas. The dust will generate a certain resistance to the flow of the flue gas, affecting the gas flow rate. At the same time, the dust and other solid particles will wear down the surface of the bulging heat exchange core 201. Although the prior art sets a filter device at the flue gas inlet to collect the dust, a small amount of dust will still enter the flue gas flow channel 102 with the flue gas.

[0034] Therefore, refer to Figure 12 An interception hole 402 is provided on the flow guide frame 4. The interception hole 402 is located in the middle of one side of the flow guide frame 4. The cavity enclosed by the flow guide frame 4 is a temporary storage cavity. When the flue gas flows through the flow guide channel 401 and passes through the interception hole 402, dust is intercepted by the interception hole 402 under the action of inertia. Some of the intercepted dust enters the temporary storage cavity for temporary storage. Other dust is continuously collected and temporarily stored as it passes through the next interception hole 402. When the expansion heat exchange core 201 is being repaired, such as... Figure 8 By separating two adjacent heat exchange plates, the temporary storage chamber can be opened and exposed for cleaning of dust.

[0035] Secondly, the intercepted smoke experiences less dust resistance when it is discharged through the air guide hole 303, which can increase the impact distance of this part of the smoke.

[0036] Among them, the flow guide frame 4 is provided with an interception protrusion 403, which protrudes in the direction of flue gas flow so that dust can enter the temporary storage chamber under the action of inertia.

[0037] In one specific embodiment, a cross-shaped material collection plate 404 is provided in the flow guide frame 4, which can divide the temporary storage chamber into four separate sub-chambers, thereby preventing flue gas from entering from one interception hole 402 and flowing out from the other interception hole 402, thus preventing disruption of the orderly flow of flue gas, and preventing dust from flying out from the other interception hole 402 and affecting the dust collection effect.

[0038] The horizontal plate of the material collection plate 404 is inclined downward, so that the dust on the upper side can be guided and collected.

[0039] In another embodiment, reference is made to Figure 5 , Figure 6 and Figure 7 The two adjacent heat exchange mechanisms 2 are staggered, that is, along the airflow direction, the middle of the previous flue gas duct 102 is connected to the side of the next flue gas duct 102, so that when the flue gas in the middle of the previous flue gas duct 102 that has not participated in high-frequency heat exchange enters the next flue gas duct 102, it comes into contact with the bulging heat exchange core 201 of the next flue gas duct 102, thereby improving the heat exchange efficiency of the flue gas.

[0040] When used in conjunction with the partition substrate 3, the small diameter of the air guide hole 303 at the flue gas outlet end results in better turbulence and mixing of the flue gas, making the flue gas entering the subsequent flue gas flow channel 102 more uniform. The flue gas temperatures entering the heat exchange cavity 301 and the air guide cavity 302 are closer, thereby further improving heat exchange efficiency, enhancing heat exchange uniformity, and reducing the thermal stress caused by excessive local temperature differences.

[0041] When used in conjunction with the dust removal mechanism of the flow guide frame 4, some dust in the flue gas entering the heat exchange mechanism 2 is collected. The flue gas filtered by the previous heat exchange mechanism 2 is then mixed, and the dust-laden flue gas will continue to be filtered when it enters the flow guide cavity 302 of the next heat exchange mechanism 2. This makes the dust gradually decrease along the flue gas flow direction, thereby reducing the wear of dust on the subsequent bulging heat exchange core 201.

[0042] In a specific workflow, multiple heat exchange plates of the heat exchange mechanism 2 are first assembled together with mounting bolts, and the heat exchange mechanism 2 is installed as a whole in the base shell 1 with mounting bolts. A flue gas flow channel 102 is formed between two adjacent heat exchange plates, and a medium flow channel 202 is formed inside the bulging heat exchange core 201 on the heat exchange plate. The working medium enters the medium flow channel 202 through the medium circulation pipe 101 on the base shell 1, and flows through each group of heat exchange mechanisms 2 in sequence to achieve interconnection and circulation.

[0043] Flue gas enters the base shell 1 from the flue gas inlet end and flows into the flue gas flow channel 102 under the suction action of the suction pump. When the flue gas flows in the flue gas flow channel 102, the distance between the bulging heat exchange cores 201 on the two adjacent heat exchange plates alternately increases and decreases, the flue gas becomes turbulent, the heat exchange intensity in the near wall area is increased, and at the same time the turbulence washes the inner wall of the heat exchange plate, reducing dust adhesion.

[0044] As the flue gas continues to flow through the partition plate 3, it is split. Part of the flue gas enters the heat exchange flow chamber 301, and the other part enters the guide flow chamber 302. The flue gas entering the heat exchange flow chamber 301 contacts the surface of the bulging heat exchange core 201 for heat exchange and forms turbulence. The flue gas entering the guide flow chamber 302 is ejected through the guide hole 303, impacting the flue gas that has already formed turbulence in the heat exchange flow chamber 301, so that the heat-exchanged flue gas and the unheat-exchanged flue gas are fully mixed, and the heat exchange is enhanced. Under the negative pressure at the suction end of the flue gas flow channel 102, the turbulent flue gas in the heat exchange flow chamber 301 is blocked by the partition plate 3 and will not directly enter the guide flow chamber 302. The heat exchange time between the flue gas and the bulging heat exchange core 201 in the heat exchange flow chamber 301 is extended.

[0045] Along the flue gas flow direction, the diameter of the guide hole 303 at the flue gas inlet end is larger than that at the flue gas outlet end. Therefore, a larger amount of flue gas enters the heat exchange cavity 301 at the flue gas inlet end, and this part of the flue gas participates in heat exchange in the heat exchange cavity 301 for a longer time. The diameter of the guide hole 303 at the flue gas outlet end is smaller, the ejection velocity is higher, the turbulence disturbance of the flue gas at this point is stronger, and the mixing effect is better.

[0046] The air guide hole 303 is located at a position where the distance between two adjacent bulging heat exchange cores 201 gradually increases. As the flue gas flows from the area where the distance increases to the area where the distance decreases, the flow velocity increases, enhancing the impact and mixing between the flue gas in the heat exchange cavity 301 and the flue gas ejected from the air guide hole 303. The air guide baffle 304 blocks the flue gas discharged from the air guide hole 303, extending the impact stroke of the ejected airflow, allowing the ejected flue gas to impact the area where the distance increases, promoting the flue gas to quickly adhere to the wall of the bulging heat exchange core 201 as the distance increases. The arc-shaped air guide baffle 304 guides the ejected flue gas to both sides, mixing it with the adjacent flue gas, making the flue gas temperature more uniform.

[0047] The flue gas in the airflow cavity 302 flows in the airflow channel 401 formed by the airflow guide 4. The free diffusion of the flue gas in the airflow channel 401 is restricted, the flow path is regularized, and the flow velocity at the airflow guide hole 303 at the flue gas inlet end is increased. The rhomboid airflow guide 4 causes the flue gas to be diverted along its two sides, and the flow path between adjacent airflow guide holes 303 is the shortest.

[0048] When the dust contained in the flue gas flows through the interception hole 402 on the guide frame 4, it is intercepted by inertia and temporarily stored in the temporary storage chamber. The interception protrusion 403 further guides the dust into the temporary storage chamber. When the flue gas that has been intercepted is discharged through the air guide hole 303, it experiences less resistance and a longer impact distance. The cross-shaped material collection plate 404 divides the temporary storage chamber into multiple independent sub-chambers to prevent the flue gas from entering from one interception hole 402 and flowing directly out from another interception hole 402, thus avoiding dust flying out and ensuring the dust collection effect.

[0049] When multiple heat exchange mechanisms 2 are arranged in an alternating manner, the flue gas in the middle of the previous flue gas flow channel 102 enters the side of the next flue gas flow channel 102 and comes into contact with the bulging heat exchange core 201 in the next flue gas flow channel 102 for heat exchange. This allows the flue gas in the middle of the previous flue gas flow channel 102 that has not been fully heat exchanged to have another opportunity for heat exchange, thereby improving the overall heat exchange efficiency.

[0050] The small-diameter air guide hole 303 at the flue gas outlet enhances turbulent mixing, making the flue gas temperature distribution more uniform as it enters the next flue gas flow channel 102. The flue gas temperatures entering the heat exchange chamber 301 and the air guide chamber 302 are closer, thereby reducing the thermal stress caused by local temperature differences. When the dust removal structure based on the flow guide frame 4 is in use, the dust-laden flue gas is partially collected in the previous heat exchange mechanism 2 and continues to be filtered when it enters the next heat exchange mechanism 2, so that the dust in the flue gas gradually decreases along the flow direction, reducing the wear of dust on the subsequent bulging heat exchange core 201.

[0051] When dust needs to be cleaned, separate the adjacent heat exchange plates, open and expose the temporary storage chamber, and the accumulated dust can be removed.

Claims

1. A detachable, fully welded, drum-type plate heat exchanger, comprising a heat exchange mechanism (2) composed of multiple sets of heat exchange plates, wherein multiple sets of drum-type heat exchange cores (201) are arranged on the heat exchange plates, and a flue gas flow channel (102) is provided between two adjacent heat exchange plates, characterized in that, A partition plate (3) is provided inside the flue gas flow channel (102), and an airflow guide cavity (302) is provided inside the partition plate (3). The partition plate (3) is open on the side near the flue gas inlet end. The space between the partition substrate (3) and the heat exchange plate is a heat exchange cavity (301), and the partition substrate (3) has an air guide hole (303) on its side wall near the heat exchange cavity (301).

2. The expanded-type, fully welded, detachable plate heat exchanger according to claim 1, characterized in that, The diameter of the air guide hole (303) located at the flue gas inlet end is larger than the diameter of the air guide hole (303) located at the flue gas outlet end.

3. The expanded-type fully welded detachable plate heat exchanger according to claim 1, characterized in that, The air guide hole (303) is located at the point where the distance between the bulging heat exchange cores (201) on two adjacent heat exchange plates increases from small to large.

4. The expanded-type fully welded detachable plate heat exchanger according to claim 3, characterized in that, A baffle plate (304) is provided on the side of the air guide hole (303) near the flue gas inlet.

5. A drum-type, fully welded, detachable plate heat exchanger according to claim 4, characterized in that, The air guide baffle (304) is arranged in an arc shape.

6. The expanded-type fully welded detachable plate heat exchanger according to claim 1, characterized in that, Multiple sets of air guide frames (4) are provided in the air guide cavity (302), and an air guide channel (401) is provided between two adjacent air guide frames (4), and the air guide hole (303) is connected in the air guide channel (401).

7. A drum-type, fully welded, detachable plate heat exchanger according to claim 6, characterized in that, The flow guide (4) is provided with an interception hole (402), which is located in the middle of one side of the flow guide (4). The cavity enclosed by the flow guide (4) is a temporary storage cavity.

8. A drum-type, fully welded, detachable plate heat exchanger according to claim 7, characterized in that, An interception protrusion (403) is provided on the flow guide (4), and the interception protrusion (403) protrudes in the direction of flue gas flow.

9. A drum-type, fully welded, detachable plate heat exchanger according to claim 8, characterized in that, The flow guide (4) is provided with a cross-shaped material catcher (404), which is used to divide the temporary storage chamber into four separate sub-chambers.

10. A drum-type, fully welded, detachable plate heat exchanger according to claim 1, characterized in that, It also includes a base shell (1), and the heat exchange mechanism (2) is provided in multiple sets and installed on the base shell (1); The heat exchange mechanisms (2) in the two adjacent groups are staggered.

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