Heat exchanger capable of improving heat exchange efficiency

Abstract

The utility model relates to the technical field of heat exchange equipment, and discloses a heat exchanger capable of improving heat exchange efficiency, which comprises a heat exchanger shell, a plurality of heat exchange pipes are arranged in the heat exchanger shell in parallel, a plurality of groups of heat exchange pipes are transversely distributed, the end parts of the plurality of heat exchange pipes in each group are sequentially connected with bent pipes, and are combined into a coherent water pipeline; the multiple water inlet ends jointly communicate with a water inlet header pipe, the multiple water outlet ends jointly communicate with a water outlet header pipe, an air inlet and an air outlet are formed in the two sides, located in the length direction of the heat exchange pipe, of the heat exchanger shell correspondingly, and a flow expanding device covers the air inlet and comprises a flow expanding base body and a plurality of flow dividing pipes. The air inlet ends of the flow dividing pipes are evenly distributed at the inlet of the flow expanding base body, and the air outlet ends of the flow dividing pipes extend into the heat exchanger shell, are bent in the direction away from the center axis of the heat exchanger shell and are evenly distributed at the outlet of the flow expanding base body. The effect of improving the heat exchange efficiency of the heat exchanger is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchange equipment, and in particular to a heat exchanger capable of improving heat exchange efficiency. BACKGROUND

[0002] In the complex production system of an ethylene plant, the contradiction between energy utilization and resource allocation is increasingly prominent. On the one hand, there are a large number of heating media such as steam and steam condensate hot water in the plant, which contain abundant waste heat. However, due to the lack of effective utilization methods, a large amount of waste heat is wasted. At the same time, part of the steam is long-term vented due to the lack of proper treatment methods, not only causing environmental pollution, but also leading to a huge waste of valuable energy resources. On the other hand, the cracking furnace is the core equipment of ethylene production, which needs to consume a large amount of fuel to heat the air entering the furnace. The traditional heating method is inefficient, and the heat generated by fuel combustion cannot be fully recovered and utilized, further exacerbating energy waste.

[0003] In order to solve the above problems, the industry generally uses ordinary finned tube heat exchangers to recover waste heat. Specifically, the ordinary finned tube heat exchanger transfers the waste heat of steam or steam condensate hot water to the air entering the cracking furnace, realizing effective transfer of energy. The common finned tube heat exchanger design includes a plurality of parallel arranged heat exchange tubes, each heat exchange tube is provided with fins to increase the surface area, thereby improving the heat transfer efficiency. In addition, the heat exchanger shell is usually provided with air inlet and outlet to facilitate the flow of air and absorb heat through the heat exchange tube.

[0004] However, the existing ordinary finned tube heat exchanger generally has the problem of low heat exchange efficiency, especially when dealing with high temperature and high pressure steam, its heat transfer coefficient is low, which cannot completely recover waste heat, resulting in low heat energy utilization rate. In addition, the air side resistance of the ordinary finned tube heat exchanger is large, and an additional fan is needed to overcome this resistance, which increases the energy consumption of the system and reduces the overall energy saving effect. Practical new type content

[0005] In order to improve the heat exchange efficiency of the heat exchanger, the present application provides a heat exchanger capable of improving heat exchange efficiency.

[0006] The heat exchanger capable of improving heat exchange efficiency provided by the present application adopts the following technical scheme:

[0007] The utility model provides a kind of heat exchanger capable of improving heat exchange efficiency, including heat exchanger shell, several heat exchange pipes are arranged in parallel in the heat exchanger shell, several heat exchange pipes are distributed with multiple groups along transverse direction, the end of the extension of several heat exchange pipes in each group in heat exchanger shell is sequentially connected with elbow pipe, several heat exchange pipes and elbow pipe in each group are combined into one coherent water channel, the water inlet end and water outlet end of each water channel extend out of heat exchanger shell, multiple water inlet ends are commonly connected with water inlet main pipe, and multiple water outlet ends are commonly connected with water outlet main pipe, air inlet and air outlet are respectively arranged on the both sides of heat exchanger shell in the length direction of heat exchange pipe, the air inlet is covered with flow spreading device, the air inlet of flow spreading device is connected with air inlet pipe, and the flow spreading device includes the flow spreading base body arranged in the shape of horn and several shunt pipes arranged in flow spreading base body, the air inlet end of several shunt pipes is evenly distributed at the air inlet of flow spreading base body, the air outlet end of several shunt pipes extends into heat exchanger shell and is bent towards the direction of center axis of heat exchanger shell, and is evenly distributed at the air outlet of flow spreading base body.

[0008] By adopting the above technical scheme, the horn-shaped flow spreading base body and the honeycomb-shaped shunt pipes of the flow spreading device can significantly increase the contact area between air and heat exchange pipes, and make the air evenly dispersed in the heat exchanger shell after entering the heat exchanger, and exchange heat with the heat exchange pipes, to realize efficient heat absorption. This design not only improves the heat recovery rate, but also ensures that the air is fully heated in these areas, improving the overall heat exchange efficiency. In addition, the design of the flow spreading base body can also effectively reduce air flow resistance, reduce fan energy consumption, and further enhance the energy-saving performance of the system.

[0009] Optionally, a receptacle is arranged in the flow spreading base body corresponding to each shunt pipe, the shunt pipe and the receptacle are inserted and matched, a support edge is arranged on the air inlet end of the shunt pipe, and a sealing ring is arranged on each shunt pipe and pressed between the support edge and the flow spreading base body.

[0010] By adopting the above technical scheme, the detachable connection design between each shunt pipe and the flow spreading base body makes it convenient to replace and clean the single blocked shunt pipe. At the same time, the structure of the sealing ring and the support edge enhances the stability of the shunt pipe at the air inlet end, effectively avoids air leakage, ensures that the system has good sealing performance, and further improves the heat exchange efficiency.

[0011] Optionally, a filter steel mesh is arranged between the flow spreading device and the air inlet pipe, the air inlet pipe is screwed on the flow spreading device, and the filter steel mesh is tightly pressed on the support edges.

[0012] By adopting the above technical scheme, the filter steel net can effectively intercept impurities in the air, reduce the possibility of entering the heat exchanger, and thus reduce the influence on the heat exchange efficiency. Meanwhile, the air inlet pipe is sleeved on the flow expansion base through threads, and the filter steel net is abutted against the support edge, so that the structure is more stable, and the installation and maintenance are facilitated.

[0013] Optionally, a impeller is rotatably arranged in the air inlet pipe, an axis of the impeller is coaxially arranged with the air inlet pipe, and a brush rod is connected to one end of the impeller close to the filter steel net, and the brush rod covers the mesh surface of the filter steel net along the rotation of the impeller.

[0014] By adopting the above technical scheme, when the impeller rotates in the air inlet pipe, the brush rod can cover and clean the mesh surface of the filter steel net, effectively prevent dust and impurities from blocking the filter steel net, ensure smooth air flow, and improve the working efficiency of the heat exchanger. Meanwhile, this design does not require an additional power source, and can realize automatic cleaning function by relying on air flow, thereby reducing maintenance cost and prolonging service life of the equipment.

[0015] Optionally, the heat exchange pipe is provided with a spiral fin around the periphery in the heat exchanger.

[0016] By adopting the above technical scheme, the spiral fin can increase the contact area between the fluid and the heat exchange pipe, so that more heat can be transferred to the air in a short time, thereby improving the performance of the entire heat exchanger. Meanwhile, the spiral fin can also improve the flow characteristics, reduce local turbulence, and further improve the heat transfer effect.

[0017] Optionally, the spiral fins on the adjacent two rows of heat exchange pipes are oppositely arranged.

[0018] By adopting the above technical scheme, the spiral fins on the adjacent two rows of heat exchange pipes are oppositely arranged, which can effectively enhance the turbulence effect, promote the mixing between fluids, and further improve the heat exchange efficiency. Meanwhile, this design can also reduce flow resistance and energy consumption, so as to ensure that the heat exchanger operates efficiently while maintaining a low operating cost.

[0019] Optionally, a flow collecting shell covering the air outlet is connected to the heat exchanger shell, the flow collecting shell is arranged in a horn shape, an air outlet pipe is connected to the air outlet end of the flow collecting shell, and silver-plated copper finned tubes are used for the several rows of heat exchange pipes close to the flow collecting shell.

[0020] By adopting the above technical scheme, the horn-shaped design of the flow collecting shell helps to guide and concentrate the outflowing air, reduces turbulence and resistance loss, and improves the gas flow efficiency. Meanwhile, the silver-plated copper finned tubes are used for the several rows of heat exchange pipes close to the flow collecting shell, which significantly improves the heat conduction performance of the heat exchange pipes at the outlet water pipe, further improves the energy utilization rate, and reduces the energy waste rate.

[0021] Optionally, a connecting plate is arranged between the flow expansion device and the flow gathering shell, one connecting plate is arranged on each side of the length direction of the heat exchanger shell, the two connecting plates, the flow expansion device and the flow gathering shell form a sleeve shell for sleeving the heat exchanger shell, and a sealing gasket is arranged at the abutting position of the flow expansion device, the flow gathering shell and the heat exchanger shell.

[0022] By adopting the above technical scheme, the sleeve shell structure formed between the connecting plate, the flow expansion device and the flow gathering shell for sleeving the heat exchanger shell makes it convenient to pull out the heat exchanger shell from the sleeve shell when the heat exchange pipe needs to be cleaned, thereby improving the convenience of cleaning operation. Meanwhile, the arrangement of the sealing gasket effectively enhances the sealing performance of the flow expansion device and the flow gathering shell covering the air inlet and outlet of the heat exchanger shell, reduces the possibility of air leakage, and further improves the heat exchange efficiency.

[0023] In summary, the present application has at least one of the following beneficial technical effects:

[0024] 1. The horn-shaped flow expansion base body and the honeycomb-shaped distributed shunt pipes of the flow expansion device can significantly increase the contact area of air and heat exchange pipes, and make the air uniformly dispersed in the heat exchanger shell after entering the heat exchanger, and exchange heat with the heat exchange pipes, so as to realize efficient heat absorption. This design not only improves the heat recovery rate, but also ensures that the air is fully heated in these areas, thereby improving the overall heat exchange efficiency. In addition, the design of the flow expansion base body can also effectively reduce the air flow resistance, reduce the energy consumption of the fan, and further enhance the energy-saving performance of the system;

[0025] 2. The detachable connection design between each shunt pipe and the flow expansion base body makes it convenient to replace and clean the single blocked shunt pipe. At the same time, the structure of the sealing ring and the support edge enhances the stability of the shunt pipe at the air inlet end, effectively avoids air leakage, ensures that the system has good sealing performance, and further improves the heat exchange efficiency;

[0026] 3. The filter steel mesh can effectively intercept impurities in the air, reduce the possibility of entering the heat exchanger, and thus reduce the influence on the heat exchange efficiency. At the same time, the air inlet pipe is sleeved on the flow expansion base body through threads, and the filter steel mesh is tightly pressed against the support edge, so that the structure is more stable and convenient to install and maintain. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a schematic diagram of the overall structure of the embodiment of the present application.

[0028] Figure 2 is a sectional view of the overall structure of the embodiment of the present application.

[0029] Figure 3 is a sectional view of the embodiment of the present application, which shows the positional relationship between the impeller, the filter steel mesh and the shunt pipe.

[0030] Marked for explanation:

[0031] 1, heat exchanger shell; 11, air inlet; 12, air outlet; 2, heat exchange pipe; 21, elbow; 22, water inlet pipe; 23, water outlet pipe; 24, spiral fin; 3, flow expansion device; 31, flow expansion base; 311, jack; 32, shunt pipe; 321, support edge; 322, sealing ring; 4, air inlet pipe; 41, support plate; 42, impeller; 421, brush rod; 422, reinforcing rib; 5, flow collection shell; 51, sealing pad; 52, bolt; 6, air outlet pipe; 7, connecting plate; 8, support leg; 9, filter steel mesh. DETAILED DESCRIPTION

[0032] The following will be described in detail with reference to the accompanying drawings Figures 1-3 Further detailed description is made to the present application.

[0033] The present application discloses a heat exchanger capable of improving heat exchange efficiency.

[0034] Reference Figure 1 and Figure 2 A heat exchanger capable of improving heat exchange efficiency comprises a heat exchanger shell 1, a plurality of heat exchange pipes 2 are installed in parallel in the heat exchanger shell 1, an air inlet 11 is arranged at the bottom of the heat exchanger shell 1, a flow expansion device 3 is arranged at the air inlet 11, and an air inlet pipe 4 is connected to the air inlet of the flow expansion device 3. An air outlet 12 is arranged at the top of the heat exchanger shell 1, a flow collection shell 5 is arranged at the air outlet 12, the flow collection shell 5 is arranged in a horn shape, and an air outlet pipe 6 is connected to the air outlet end of the flow collection shell 5. A connecting plate 7 is fixedly arranged between the flow expansion device 3 and the flow collection shell 5, one connecting plate 7 is arranged on each side of the length direction of the heat exchanger shell 1, a sleeve shell of the heat exchanger shell 1 is formed between the two connecting plates 7, the flow expansion device 3 and the flow collection shell 5, and the flow expansion device 3 and the flow collection shell 5 are fixed on the heat exchanger shell 1 through sealing pads 51 and bolts 52. A plurality of support legs 8 are fixedly arranged at the bottom of the flow expansion device 3.

[0035] Reference Figure 1 and Figure 2 A plurality of groups of heat exchange pipes 2 are distributed in the transverse direction, a plurality of heat exchange pipes 2 in each group are sequentially connected and installed with an elbow 21 extending out of the end of the heat exchanger shell 1, and the plurality of heat exchange pipes 2 and the elbow 21 in each group are combined into a continuous water passage, the water inlet end and the water outlet end of each water passage extend out of the heat exchanger shell 1, a plurality of water inlet ends are commonly connected and installed with a water inlet pipe 22, and a plurality of water outlet ends are commonly connected and installed with a water outlet pipe 23, the water inlet pipe 22 and the water outlet pipe 23 are arranged on the same side of the heat exchanger shell 1, and the water inlet pipe 22 is located above the water outlet pipe 23.

[0036] Reference Figure 1 and Figure 2In the use of the heat exchanger, steam or steam condensate hot water is injected from the upper water inlet pipe 22 into the heat exchange pipe 2, flows in the water pipe, and finally flows out from the lower water outlet pipe 23. The air outlet pipe 6 is connected with the air inlet end of the cracking furnace, and the cracking furnace uses its own suction to suck air into the heat exchanger shell 1 from the self-expanding flow device 3. The steam or steam condensate hot water flowing in the heat exchange pipe 2 exchanges heat with the air through the pipe wall of the heat exchange pipe 2, and the hot air after heat exchange is guided by the converging shell 5 and is sucked into the furnace by the cracking furnace.

[0037] Referring to Figure 2 Each heat exchange pipe 2 is fixedly arranged with a spiral fin 24 on the circumference in the heat exchanger, and the spiral fins 24 on the adjacent two rows of heat exchange pipes 2 are arranged in opposite directions. The several rows of heat exchange pipes 2 near the converging shell 5 use silver-plated copper finned tubes.

[0038] Referring to Figure 2 And Figure 3 The expanding flow device 3 includes an expanding flow base body 31 and a plurality of shunt pipes 32. The expanding flow base body 31 is arranged in a trumpet shape, and the size of the inlet is smaller than that of the outlet. The air inlet pipe 4 is threadedly sleeved at the inlet of the expanding flow base body 31. The shunt pipe 32 is a bendable high-temperature-resistant plastic hose, and a plurality of shunt pipes 32 are inserted into the expanding flow base body 31. The expanding flow base body 31 is provided with an insertion hole 311 corresponding to each shunt pipe 32, and the shunt pipe 32 is inserted and matched with the insertion hole 311. The air inlet ends of the plurality of shunt pipes 32 are uniformly distributed at the inlet of the expanding flow base body 31, the air outlet ends extend into the heat exchanger shell 1 and are bent towards the direction away from the central axis of the heat exchanger shell 1, and are uniformly distributed at the outlet of the expanding flow base body 31.

[0039] Referring to Figure 3 The outer circle of the air inlet end of each shunt pipe 32 is integrally formed with an outwardly turned supporting edge 321, and a sealing ring 322 is sleeved on each shunt pipe 32, and the sealing ring 322 is pressed between the supporting edge 321 and the expanding flow base body 31.

[0040] Referring to Figure 3 A filter steel mesh 9 is arranged between the expanding flow device 3 and the air inlet pipe 4. The filter steel mesh 9 abuts the supporting edges 321 of the plurality of shunt pipes 32 against the end wall of the expanding flow base body 31, and the air inlet pipe 4 abuts the filter steel mesh 9 against the plurality of supporting edges 321.

[0041] Referring to Figure 3In order to reduce the mesh clogging rate of the filter steel mesh 9, the impeller 42 is coaxially arranged in the air inlet pipe 4, the air inlet end of the air inlet pipe 4 is fixedly provided with a cross-shaped support plate 41, the impeller 42 is rotatably arranged on the side of the support plate 41 facing the filter steel mesh 9 through a bearing, and the small-diameter end of the impeller 42 faces the air inlet end of the air inlet pipe 4. The rotating shaft end of the impeller 42 extends to the surface of the filter steel mesh 9 and is connected with a brush rod 421, the brush rod 421 is arranged perpendicular to the rotating shaft of the impeller 42 and is fixed on the side wall of the rotating shaft of the impeller 42 in cooperation with the radius of the air inlet pipe 4, and the connection between the rotating shaft of the impeller 42 and the brush rod 421 is fixedly provided with a reinforcing rib 422, and the bristle side of the brush rod 421 abuts against the filter steel mesh 9.

[0042] The implementation principle of the heat exchanger capable of improving heat exchange efficiency is as follows: in the use process of the heat exchanger, steam or steam condensate hot water is injected from the upper water inlet main pipe 22 into the heat exchange pipe 2, flows in the water passage, and finally flows out from the lower water outlet main pipe 23. The air inlet pipe 6 is connected with the air inlet end of the cracking furnace, the cracking furnace uses its own suction to suck air from the air inlet pipe 4, and filters impurities in the air through the filter steel mesh 9. The filtered air flows through the flow expansion device 3 and is uniformly dispersed in the heat exchanger shell 1, exchanges heat with the steam or steam condensate hot water flowing in the heat exchange pipe 2 through the pipe wall and the spiral fin 24 of the heat exchange pipe 2, and the hot air after heat exchange is guided by the flow gathering shell 5 and is sucked into the furnace by the cracking furnace.

[0043] In this process, the air sucked from the air inlet end of the air inlet pipe 4 continuously impacts on the guide vanes of the impeller 42, so that the impeller 42 rotates, and the rotating impeller 42 rotates with the brush rod 421 taking the end of the rotating shaft of the impeller 42 as the rotation center. After the brush rod 421 rotates one circle, the scraping path of the brush rod 421 covers the mesh of the filter steel mesh 9, and in the process of rotation, the brush rod 421 pushes the impurities clogging in the mesh of the filter steel mesh 9 away from the mesh, so as to improve the heat exchange efficiency.

[0044] The above are the preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A heat exchanger capable of improving heat exchange efficiency, comprising a heat exchanger shell (1), wherein a plurality of heat exchange tubes (2) are arranged in parallel inside the heat exchanger shell (1), the plurality of heat exchange tubes (2) are distributed in multiple groups along the transverse direction, and the ends of the plurality of heat exchange tubes (2) in each group extending out of the heat exchanger shell (1) are sequentially connected to bends (21), the plurality of heat exchange tubes (2) and bends (21) in each group are combined to form a continuous water pipe, the inlet end and the outlet end of each water pipe extend out of the heat exchanger shell (1), the plurality of inlet ends are connected to a common inlet manifold (22), and the plurality of outlet ends are connected to a common outlet manifold (23), characterized in that The heat exchanger shell (1) is provided with an air inlet (11) and an air outlet (12) on both sides of the heat exchange tube (2) along the length direction. The air inlet (11) is covered with a flow diffuser (3). The air inlet of the flow diffuser (3) is connected to an air inlet pipe (4). The flow diffuser (3) includes a flow diffuser base (31) arranged in a trumpet shape and several flow dividers (32) arranged on the flow diffuser base (31). The air inlet ends of the several flow dividers (32) are evenly distributed at the inlet of the flow diffuser base (31). The air outlet ends of the several flow dividers (32) extend into the heat exchanger shell (1) and bend in a direction away from the central axis of the heat exchanger shell (1), and are evenly distributed at the outlet of the flow diffuser base (31).

2. A heat exchanger capable of improving heat exchange efficiency according to claim 1, characterized in that... The expansion substrate (31) has a corresponding insertion hole (311) for each diverter pipe (32). The diverter pipe (32) is inserted into the insertion hole (311). The outer ring of the air inlet end of the diverter pipe (32) is provided with a support edge (321). Each diverter pipe (32) is fitted with a sealing ring (322). The sealing ring (322) is pressed between the support edge (321) and the expansion substrate (31).

3. A heat exchanger capable of improving heat exchange efficiency according to claim 2, characterized in that... A filter steel mesh (9) is provided between the flow-expanding device (3) and the air inlet pipe (4). The air inlet pipe (4) is threaded onto the flow-expanding device (3) and the filter steel mesh (9) is pressed against several support edges (321).

4. A heat exchanger capable of improving heat exchange efficiency according to claim 3, characterized in that... An impeller (42) is rotatably installed inside the air inlet pipe (4). The axial direction of the impeller (42) is coaxial with that of the air inlet pipe (4). A brush rod (421) is connected to one end of the shaft of the impeller (42) near the filter steel mesh (9). The brush rod (421) rotates along the impeller (42) and covers the mesh surface of the filter steel mesh (9).

5. A heat exchanger capable of improving heat exchange efficiency according to claim 1, characterized in that... The heat exchange tube (2) is located inside the heat exchanger and has spiral fins (24) wrapped around its periphery.

6. A heat exchanger capable of improving heat exchange efficiency according to claim 5, characterized in that... The spiral fins (24) on two adjacent heat exchange tubes (2) are arranged in opposite directions of rotation.

7. A heat exchanger capable of improving heat exchange efficiency according to claim 1, characterized in that... The heat exchanger shell (1) is connected to a flow-gathering shell (5) covering the air outlet (12). The flow-gathering shell (5) is arranged in a trumpet shape, and its air outlet end is connected to an air outlet pipe (6). Several rows of heat exchange tubes (2) near the flow-gathering shell (5) are silver-plated copper finned tubes.

8. A heat exchanger capable of improving heat exchange efficiency according to claim 1, characterized in that, A connecting plate (7) is provided between the flow-expanding device (3) and the flow-concentrating shell (5). One connecting plate (7) is provided on each side of the heat exchanger shell (1) along its length. The two connecting plates (7), the flow-expanding device (3), and the flow-concentrating shell (5) form a shell that covers the heat exchanger shell (1). A sealing gasket (51) is provided at the contact point between the flow-expanding device (3), the flow-concentrating shell (5), and the heat exchanger shell (1).

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