A heat exchanger for a condensing boiler and its usage method

Abstract

This invention discloses a heat exchanger for a condensing boiler and its usage method, relating to the field of heat exchanger technology. The device includes a shell with an inlet pipe and an outlet pipe connected within it. A disturbance component is installed inside the shell. A tube sheet and a partition plate are fixedly connected inside the shell, with the tube sheet and partition plate fixedly connected. Multiple circulation pipes are fixedly connected to the tube sheet. The disturbance component in this device, through the cooperation of an inclined baffle plate and a reciprocatingly rotating disturbance plate, can dynamically disturb and enhance the turbulence formed by the flue gas. This solves the problem of weak turbulence and dead zones behind vertically fixed baffle plates in existing technologies. The rotatable disturbance plate can periodically disturb the flue gas, effectively disrupting and reorganizing the flue gas remaining behind the baffle plate, drawing the flue gas in the "dead zone" into the mainstream, enhancing turbulent mixing and heat exchange, and further improving the fluidity of the flue gas in the energy-saving heat exchange device.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger technology, and more specifically, to a heat exchanger for a condensing boiler and its method of use. Background Technology

[0002] Shell-and-tube heat exchangers are the core components of condensing boilers, and their performance directly determines the boiler's thermal efficiency and operational reliability. During use, high-temperature flue gas enters from the inlet on the shell side, flows through the gaps in the circulating tube bundle, exchanges heat with the low-temperature return water inside the tubes, and is then discharged.

[0003] In existing shell-and-tube heat exchangers, because the cross-sectional area of ​​the inlet is much smaller than the cross-sectional area of ​​the shell side, the high-speed flue gas will form a strong "jet effect" at the inlet. This high-speed jet will directly impact the tube bundle in the central area opposite the inlet, resulting in excessive flue gas flow and high velocity in this local area. Meanwhile, the tube bundle areas on both sides will form "low-speed dead zones" because the flue gas cannot reach them effectively, resulting in "local overheating" or "inadequate cooling".

[0004] Furthermore, existing technologies generally employ vertically arranged baffles to form a shell-side flow field. This method achieves heat exchange by forcing the flue gas to repeatedly turn laterally and scour the tube bundle. However, this method will cause a flow dead zone behind the baffle, causing the flue gas to stagnate in this area, resulting in ineffective heat exchange.

[0005] In addition, since the cross-sectional area of ​​the low-temperature return water inlet pipe is much smaller than that of the tube box cavity, and the water is pumped into the circulation pipe, the incoming water will form a high-speed jet in the cavity. This causes most of the fluid to directly impact and flow through the circulation pipe bundle in the central area facing the inlet, while the flow rate to the circulation pipe bundle in the edge and corner areas is insufficient. This will result in the inability to effectively cool the corresponding shell-side flue gas, forming a heat exchange "dead zone" and causing a decrease in the overall heat transfer area utilization rate.

[0006] Meanwhile, even after the boiler and heat exchanger are shut down, the blower will continue to operate for a period of time, sending air into the heat exchanger to purge the residual flue gas in the shell side. However, this method cannot remove the residual low-temperature return water in the circulating pipes, and the purging cannot cover the outer wall of all circulating pipes, resulting in acidic condensate still adsorbed on the pipe wall surface. (When the high-temperature flue gas is cooled below its dew point temperature in the heat exchanger, water vapor begins to condense into condensate and forms a very thin water film on the metal wall. This liquid water film adsorbs acidic gases in the flue gas, thus forming acidic condensate. However, when both the boiler and heat exchanger are operating, condensate is continuously generated to flush the water film, so acidic condensate does not remain on the outer surface of the pipe wall during operation.) Since the acidic condensate is still on the pipe wall surface after shutdown, it will cause shutdown corrosion.

[0007] To solve the above problems, the inventors proposed a heat exchanger for a condensing boiler. Summary of the Invention

[0008] To solve the above-mentioned technical problems, a heat exchanger for a condensing boiler is provided. This technical solution solves the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention can be implemented using the following technical solutions:

[0010] This invention provides a heat exchanger for a condensing boiler, comprising a shell, an inlet pipe and an outlet pipe connected inside the shell, a tube sheet and a partition plate fixedly connected inside the shell, the tube sheet and the partition plate being fixedly connected, and a plurality of circulation pipes being fixedly connected to the tube sheet;

[0011] The housing is equipped with a disturbance component, which includes a baffle plate fixedly connected to the housing. Multiple baffle plates are arranged in parallel and offset positions. A disturbance plate is rotatably connected to each baffle plate. A sleeve is fixedly connected to the outer wall of the housing. A drive shaft is rotatably connected inside the sleeve. Multiple multi-groove pulleys are rotatably connected to the outer wall of the housing and the end of the drive shaft. A bracket is fixedly connected to the outer wall of the housing. A servo motor is fixedly connected to the surface of the bracket. A crank is rotatably connected to the bracket. A long rod is rotatably connected to the bottom of the crank. An active plate is rotatably connected to the long rod.

[0012] The housing is provided with a flow splitting assembly, which is located below the intake pipe. The flow splitting assembly includes a frame, and two frames are symmetrically arranged. Each frame is fixedly connected to the housing, and two guide plates are fixedly connected to each frame.

[0013] Preferably, each of the baffles is inclined, each of the disturbance plates has a toothed groove on its outer wall, each of the disturbance plates is fixedly connected to a nearby multi-groove pulley, wherein two of the multi-groove pulleys are fixedly connected to a drive shaft, and each pair of multi-groove pulleys is connected by a synchronous belt drive.

[0014] Preferably, the output shaft of the servo motor is fixedly connected to the crank, the active plate is rotatably connected to the bracket, and the active plate is fixedly connected to one of the multi-groove pulleys.

[0015] Preferably, the diversion assembly includes two oscillating plates symmetrically arranged. Each oscillating plate is rotatably connected to a nearby guide plate. Each frame is symmetrically fixedly connected to two springs with respect to the oscillating plate. Each guide plate is fixedly connected to a reset pad.

[0016] Preferably, each of the guide plates is inclined, and each of the guide plates and each swing plate has a guide groove on its surface.

[0017] Preferably, each of the swing plates abuts against two adjacent reset pads, and each of the swing plates is arranged parallel to the guide plate.

[0018] Preferably, a flow stabilizing component is provided inside the housing. The flow stabilizing component includes a three-way ball valve, a flow stabilizing plate, and a heating box. A valve body is rotatably connected inside the three-way ball valve. An L-shaped flow channel is opened inside the valve body. A valve stem is fixedly connected to the valve body. Three connecting pipes are connected inside the three-way ball valve. A water outlet pipe is provided at the end of the housing.

[0019] Preferably, the valve stem is rotatably connected to the three-way ball valve, one of the connecting pipes is connected to the inside of the housing, and the remaining two connecting pipes are respectively connected to the circulating water tank and the heating tank. The circulating water tank is equipped with a water pump and a cooling plate, and the top of the circulating water tank is equipped with an exhaust port. The water outlet pipe is connected to the circulating water tank, and the heating tank is equipped with an air pump.

[0020] Preferably, the flow stabilizer plate has multiple holes, the diameter of the holes in the central region of the flow stabilizer plate is smaller than the diameter of the holes in the edge region, and the density of the holes in the central region of the flow stabilizer plate is higher than the density of the holes in the edge region.

[0021] Preferably, a method for using a heat exchanger in a condensing boiler is proposed, comprising the following steps:

[0022] Step 1, Water Return Circulation: Confirm the connectivity of the water circuit, start the water pump in the circulating water tank, so that the circulating pipe bundle is filled with water, and the low-temperature return water returns to the circulating water tank through the outlet pipe. When the low-temperature return water forms a circulation loop, the heat exchanger enters the ready-to-operate state.

[0023] Step 2, Introduce flue gas: Turn on the boiler blower and use the blower to send the flue gas generated by the boiler combustion into the heat exchanger through the air inlet pipe. The flue gas equipment then enters the condensation and heat exchange operation state.

[0024] Step 3, Shutdown and Purging: When shutting down, turn off the boiler and use a blower to purge the residual flue gas in the shell side. Then, cut off the water circuit and connect the dry hot air source. Use dry hot air to purge the tube side and the cavity after the valve to completely drain the residual water and the acidic condensate remaining on the outer wall of the evaporator tube bundle.

[0025] As described above, the advantages of this invention are:

[0026] The disturbance component in this device, through the cooperation of an inclined baffle plate and a reciprocating rotating disturbance plate, can dynamically disturb and enhance the turbulence formed by the flue gas. This solves the problem of weak turbulence and dead zone behind the vertical fixed baffle plate in the prior art. The rotating disturbance plate can periodically disturb the flue gas, effectively disrupting and reorganizing the flue gas lingering behind the baffle plate, entraining the flue gas in the "dead zone" into the main flow, enhancing turbulent mixing and heat exchange, and further improving the fluidity of the flue gas in the energy-saving heat exchange device.

[0027] The flow-dividing component in this device, through the coordinated design of a fixed guide plate and a freely rotating swing plate, achieves the effects of active segmentation, deflection, and disturbance of the flue gas. This improves the uniformity of flue gas coverage in the circulating tube bundle and solves the problem in the prior art where, after the flue gas enters the large-section shell side from the inlet pipe, it directly impacts the opposing circulating tube bundle at a "high velocity," resulting in a high velocity in the central region and a slow velocity in the two sides, leading to uneven velocity distribution and the formation of a "low-velocity dead zone." In this way, more circulating tube bundles participate in effective heat exchange, improving the overall heat exchange efficiency and enhancing the heat exchange efficiency of the energy-saving heat exchange device.

[0028] The flow stabilizing component in this device redistributes the low-temperature return water flow or air heat flow through the flow stabilizing plate by creating holes of varying diameters. This further ensures a more uniform flow rate into each circulation pipe, solving the problem in existing technologies where, due to fluid inertia, most of the fluid flows directly to the central tube bundle of the opposing circulation pipe, resulting in excessive flow while the flow to the peripheral circulation pipe bundles is insufficient. Uniform flow rate means that each circulation pipe bundle is fully utilized, maintaining consistent cooling capacity on its outer wall. This improves the latent heat recovery rate of water vapor and further enhances the condensation capacity of the energy-saving heat exchange device.

[0029] The flow stabilizing component in this device achieves rapid switching through a direct connection design between the integrated three-way ball valve and the housing. It can replace the low-temperature return water in the circulation pipe bundle with dry hot gas, and raise the temperature of the circulation pipe wall. This causes the acidic condensate adsorbed on the pipe wall to evaporate, solving the problem that acidic condensate remains on the outer surface of the circulation pipe bundle after the boiler is shut down, leading to corrosion and a decrease in condensation capacity during subsequent condensation. Attached Figure Description

[0030] Figure 1 This is a front perspective view of the overall structure of the present invention;

[0031] Figure 2 This is a three-dimensional cross-sectional view of the interior of the housing shown in this invention;

[0032] Figure 3 This is a three-dimensional schematic diagram of the housing, baffle plate, and related components shown in this invention;

[0033] Figure 4 This is an exploded three-dimensional schematic diagram of the baffle and disturbance plate shown in this invention;

[0034] Figure 5 This is a three-dimensional schematic diagram of the sleeve and multi-groove pulley components shown in this invention;

[0035] Figure 6 This is a three-dimensional cross-sectional view of the inside of the sleeve shown in this invention;

[0036] Figure 7 This is a three-dimensional schematic diagram of the servo motor and crank-related components shown in this invention;

[0037] Figure 8 This is a three-dimensional schematic diagram of the long rod, active plate, and related components shown in the present invention;

[0038] Figure 9 This is a three-dimensional schematic diagram of the shell, frame and related components shown in this invention;

[0039] Figure 10 This is a three-dimensional schematic diagram of the frame, guide plate, and related components shown in this invention;

[0040] Figure 11 As shown in this invention Figure 9 A magnified 3D schematic diagram of part A;

[0041] Figure 12 This is a three-dimensional schematic diagram of the swing plate and reset pad components shown in the present invention;

[0042] Figure 13 This is a three-dimensional schematic diagram of the flow stabilizer plate and related components with holes shown in this invention;

[0043] Figure 14 This is a three-dimensional cross-sectional view of the internal structure of the three-way ball valve shown in this invention;

[0044] Figure 15 This is a top plan view of the valve body and connecting pipe components shown in this invention.

[0045] The reference numerals in the accompanying drawings of this invention are as follows:

[0046] 1. Shell; 2. Tube sheet; 3. Divider plate; 4. Circulation pipe;

[0047] Disturbance components: 51. Baffle plate; 52. Disturbance plate; 53. Sleeve; 54. Drive shaft; 55. Multi-groove pulley; 56. Bracket; 57. Servo motor; 58. Crank; 59. Long rod; 510. Active plate;

[0048] Diverter components: 61. Frame; 62. Diverter plate; 63. Swing plate; 64. Spring; 65. Reset pad;

[0049] Flow stabilizing components: 71. Three-way ball valve; 72. Valve body; 73. Valve stem; 74. Connecting pipe; 75. Flow stabilizing plate; 76. Hole; 77. Heating box; 78. Water outlet pipe. Detailed Implementation

[0050] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0051] The embodiments provided by the present invention will be described in detail below:

[0052] A heat exchanger for a condensing boiler, such as Figure 1 and Figure 2 As shown, the device includes a housing 1, with an inlet pipe and an outlet pipe connected inside the housing 1. Both the inlet and outlet pipes are located on the outer circumference of the housing 1 and are arranged vertically, using an upper inlet and lower outlet configuration. The inlet pipe is connected to the boiler's blower, which can send the flue gas generated by the boiler combustion into the interior of the housing 1 through the inlet pipe. After being cooled, the flue gas is then removed from the outlet pipe. A tube sheet 2 and a partition plate 3 are fixedly connected inside the housing 1. The tube sheet 2 and the partition plate 3 are fixedly connected, and multiple circulation pipes 4 are fixedly connected to the tube sheet 2. The housing 1, tube sheet 2, partition plate 3, and circulation pipes 4 are all existing technologies and will not be described in detail here.

[0053] like Figures 2 to 8 As shown, a disturbance component is provided inside the housing 1. The disturbance component includes a baffle plate 51 fixedly connected inside the housing 1. Four baffle plates 51 are arranged in parallel with each other in a staggered manner. Multiple circulation pipes 4 pass through the baffle plates 51. A disturbance plate 52 is rotatably connected to the side of each baffle plate 51 near the inner wall of the housing 1. A sleeve 53 is fixedly connected to the outer wall of the housing 1. A drive shaft 54 ​​is rotatably connected inside the sleeve 53. A multi-groove pulley 55 is rotatably connected to the outer wall of the housing 1 and the end of the drive shaft 54. There are a total of six multi-groove pulleys 55. Four of the multi-groove pulleys 55 are located on the outer wall of the housing 1, and the remaining two multi-groove pulleys 55 are located at the upper and lower ends of the drive shaft 54. A bracket 56 is fixedly connected to the outer wall of the housing 1. A servo motor 57 is fixedly connected to the upper surface of the bracket 56. A crank 58 is rotatably connected to the inner wall of the bracket 56. A long rod 59 is rotatably connected to the end of the crank 58 away from the servo motor 57. An active plate 510 is rotatably connected to the end of the long rod 59 away from the crank 58.

[0054] like Figure 9 and Figure 10 As shown, a flow splitting assembly is provided inside the housing 1. The flow splitting assembly is located below the intake pipe. The flow splitting assembly includes a frame 61. Two frames 61 are symmetrically arranged. Each frame 61 is fixedly connected to the inner cavity of the housing 1. Two guide plates 62 are fixedly connected to each frame 61.

[0055] Furthermore, such as Figures 2 to 5 As shown, each baffle 51 is inclined, and each disturbance plate 52 has a toothed groove on its outer wall. When the disturbance plate 52 rotates, the toothed groove can shear and stir the flue gas. Each disturbance plate 52 is fixedly connected to a nearby multi-groove pulley 55. Two of the multi-groove pulleys 55 are fixedly connected to the upper and lower ends of the drive shaft 54, and each pair of multi-groove pulleys 55 are connected by a synchronous belt drive.

[0056] Furthermore, such as Figure 7 As shown, the output shaft of the servo motor 57 is fixedly connected to the crank 58. The output shaft of the servo motor 57 can drive the crank 58 to rotate. The active plate 510 is rotatably connected to the surface of the bracket 56 through the mounting shaft. The mounting shaft of the active plate 510 passes through the bracket 56 and is fixedly connected to one of the multi-groove pulleys 55.

[0057] Furthermore, such as Figures 10 to 12 As shown, the diversion assembly includes two oscillating plates 63. Each oscillating plate 63 is symmetrically arranged and rotatably connected to the outer wall of the adjacent guide plate 62. Each oscillating plate 63 is located between two adjacent guide plates 62. Each frame 61 is symmetrically fixedly connected to two springs 64 between it and the oscillating plate 63. Each pair of springs 64 is located at the bottom of the adjacent oscillating plate 63. Each guide plate 62 is fixedly connected to a reset pad 65 on its surface.

[0058] Furthermore, such as Figure 10 As shown, each guide plate 62 is inclined, and each guide plate 62 and each swing plate 63 has a guide groove on its surface, so that the flue gas entering the housing 1 is guided by the inclined guide plate 62 and the guide groove.

[0059] Furthermore, such as Figure 11 and Figure 10 As shown, each swing plate 63 abuts against the bottom surface of two adjacent reset pads 65. The reset pads 65 are used to limit the swing plate 63 and restrict the rotation amplitude of the swing plate 63. Each swing plate 63 is arranged parallel to the guide plate 62.

[0060] Furthermore, such as Figures 13 to 15As shown, a flow stabilizing assembly is provided inside the housing 1. The flow stabilizing assembly includes a three-way ball valve 71, a flow stabilizing plate 75, and a heating box 77. The flow stabilizing plate 75 is located between the housing 1 and the tube sheet 2, and is located below the partition plate 3. A valve body 72 is rotatably connected inside the three-way ball valve 71. An L-shaped flow channel is opened inside the valve body 72. A valve stem 73 is fixedly connected to the outer surface of the valve body 72. Three connecting pipes 74 are connected inside the three-way ball valve 71. A water outlet pipe 78 is provided at one end of the housing 1 near the three-way ball valve 71.

[0061] Furthermore, such as Figure 14 As shown, valve stem 73 is rotatably connected to three-way ball valve 71. The upper end of valve stem 73 passes through three-way ball valve 71. Connecting pipe 74 near the side of housing 1 is connected to the space below partition plate 3. The remaining two connecting pipes 74 are connected to the external circulating water tank and heating box 77 respectively. The circulating water tank is equipped with a water pump and a cooling plate. The upper surface of the circulating water tank is equipped with an exhaust port. The end of the outlet pipe 78 away from housing 1 is connected to the circulating water tank. The water pump can send water from the circulating water tank into the interior of the circulating pipe 4, and then leave the circulating pipe 4 through the outlet pipe 78, re-enter the circulating water tank, and be cooled by the cooling plate. The heating box 77 is equipped with an air pump. The air pump can send the hot air heated by the heating box 77 into the interior of the circulating pipe 4, and finally discharge it from the exhaust port. The operator can rotate valve stem 73 to switch the L-shaped flow channel in valve body 72, thereby connecting the circulating water tank with the interior of housing 1, or connecting the heating box 77 with the interior of housing 1.

[0062] Furthermore, such as Figure 13 As shown, the vertical surface of the flow stabilizer 75 has multiple holes 76. The diameter of the holes 76 in the central region of the flow stabilizer 75 is smaller than that in the edge region. The density of the holes 76 in the central region of the flow stabilizer 75 is greater than that in the edge region. When fluid passes through the holes 76, the fluid resistance in the central region of the flow stabilizer 75 is greater than that in the edge region.

[0063] Furthermore, a method for using a heat exchanger in a condensing boiler is proposed, comprising the following steps:

[0064] Step 1, Water Return Circulation: Confirm the connectivity of the water circuit, start the water pump in the circulating water tank, so that the tube bundle of the circulating pipe 4 is filled with water, and the low-temperature return water returns to the circulating water tank through the outlet pipe 78. When the low-temperature return water forms a circulation loop, the heat exchanger enters the ready-to-operate state.

[0065] Step 2, Introduce flue gas: Turn on the boiler blower and use the blower to send the flue gas generated by the boiler combustion into the heat exchanger through the air inlet pipe. The flue gas equipment then enters the condensation and heat exchange operation state.

[0066] Step 3, Shutdown and Purging: When shutting down, turn off the boiler and use a blower to purge the residual flue gas in the shell side. Then, cut off the water circuit and connect the dry hot air source. Use dry hot air to purge the tube side and the cavity after the valve to completely drain the residual water and the acidic condensate remaining on the outer wall of the evaporator tube bundle.

[0067] During work:

[0068] This device can ensure a uniform flow rate distribution of the fluid entering the circulation pipe 4. The detailed steps are as follows:

[0069] Start the water pump so that the low-temperature return water in the circulating water tank enters the area below the partition plate 3 through the connecting pipe 74 connecting the water pump, the L-shaped flow channel in the valve body 72, and the connecting pipe 74 connecting the housing 1. The low-temperature return water will come into contact with the flow stabilizing plate 75. Since the flow stabilizing plate 75 has small and densely distributed holes 76 in the plate surface corresponding to the central area of ​​the circulating pipe 4 bundle, a high flow resistance area is formed. In the plate surface corresponding to the edge area of ​​the circulating pipe 4 bundle, the flow stabilizing plate 75 has large and sparsely distributed holes 76, a low flow resistance area is formed. When the low-temperature return water encounters the high flow resistance in the central area of ​​the flow stabilizer plate 75, part of the fluid in the low-temperature return water will be slowed down, while the other part will flow to the area with lower resistance and pass through the low-flow resistance area at the edge. In this way, the low-temperature return water is redistributed before entering the circulation pipe 4, which further makes the flow rate of low-temperature return water entering each circulation pipe 4 more uniform. The uniform flow distribution of low-temperature return water helps to make the temperature distribution of the heat exchange tube wall more uniform, thereby improving the heat transfer efficiency and the latent heat recovery efficiency of water vapor.

[0070] In the above process, the flow stabilizing component in this device, by opening holes 76 of different diameters on the flow stabilizing plate 75, redistributes the low-temperature return water flow or air heat flow passing through the flow stabilizing plate 75, further making the flow rate entering each circulation pipe 4 more uniform. This solves the problem in the prior art where, due to fluid inertia, most of the fluid flows directly to the central tube bundle of the opposite circulation pipe 4, resulting in excessive flow, while the flow rate to the peripheral circulation pipe bundles of 4 is insufficient. Uniform flow means that each circulation pipe bundle of 4 is fully utilized, keeping the cooling capacity of its outer wall consistent. This improves the latent heat recovery rate of water vapor and further enhances the condensation capacity in the energy-saving heat exchange device.

[0071] This device can guide the flue gas entering the shell side. The detailed steps are as follows:

[0072] After the low-temperature return water begins to circulate in the circulation pipe 4, the boiler blower is started. When the flue gas is blown into the shell 1 by the boiler blower from the inlet pipe located on the outer ring surface of the shell 1, it first contacts the inclined guide plate 62. The symmetrical guide plate 62 divides the high-velocity flue gas and guides it to the non-central areas on both sides through the guide grooves opened on its surface, such as... Figure 9 As shown, the flue gas is forced to change its initial direction, expanding the impact area and allowing it to contact more of the circulation pipe 4. Since the flue gas supplied by the blower is in a turbulent state, i.e., the flow velocity is not fixed, the swing plate 63 rotates towards the side closer to the spring 64 during the contact process with the flue gas, causing the swing plate 63 to compress the spring 64. Then the spring 64 rebounds and resets, causing the swing plate 63 to rotate away from the spring 64. As the impact force generated by the flue gas periodically acts on the swing plate 63, the spring 64 reciprocates, causing the swing plate 63 to swing back and forth, creating disturbance to the flue gas after it is guided, further enhancing the diffusion area of ​​the flue gas. In this way, the uniformity of the distribution of the flue gas after it enters the shell 1 is improved through the combination of "fixed guidance + dynamic disturbance".

[0073] In the above process, the flow-dividing component in this device, through the coordinated design of the fixed guide plate 62 and the freely rotating swing plate 63, achieves the effects of active segmentation, deflection and disturbance of the flue gas, thereby improving the uniformity of flue gas coverage in the circulation tube bundle 4. This solves the problem in the prior art where, after the flue gas enters the large cross-section shell side from the inlet pipe, it directly impacts the opposing circulation tube bundle 4 at a "high velocity", resulting in a high velocity in the central area and a slow velocity in the two sides, leading to uneven velocity distribution and the formation of a "low-velocity dead zone". In this way, more circulation tube bundle 4 participates in effective heat exchange, improving the overall heat exchange efficiency and the heat exchange efficiency of the energy-saving heat exchange device.

[0074] This device can enhance flue gas turbulence. The detailed steps are as follows:

[0075] Simultaneously with starting the water pump, the servo motor 57 is started, causing the output shaft of the servo motor 57 to rotate, which in turn drives the crank 58 to rotate. The crank 58, through the long rod 59, causes the drive plate 510 to reciprocate. The drive plate 510 drives one of the multi-groove pulleys 55 to reciprocate forward and reverse. Since the multi-groove pulleys 55 are connected by a synchronous belt and a transmission shaft 54, all the multi-groove pulleys 55 will rotate forward and reverse, and reciprocate in this cycle, further causing all the disturbance plates 52 to rotate forward and reverse periodically.

[0076] When the flue gas passes laterally through the circulation pipe 4, the reciprocatingly rotating disturbance plate 52, in conjunction with the toothed grooves on its outer wall, agitates and shears the flue gas in the dead zone behind the baffle plate 51. When the disturbance plate 52 reciprocates, its sides and edges will introduce the flue gas with a relatively high flow rate into the dead zone, thereby pushing out the flue gas with a lower flow rate in the dead zone, realizing the shearing and mixing of the flue gas, thereby enhancing the turbulence formed by the flue gas and further enhancing the fluidity of the flue gas.

[0077] In the above process, the disturbance component in this device, through the inclined baffle 51 and the reciprocating rotating disturbance plate 52, can dynamically disturb and enhance the turbulence formed by the flue gas, which solves the problem of weak turbulence and dead zone behind the vertical fixed baffle 51 in the prior art. The rotatable disturbance plate 52 can periodically disturb the flue gas, effectively disrupt and reorganize the flue gas behind the baffle 51, and entrain the flue gas in the "dead zone" into the main flow, enhance turbulent mixing and heat exchange, and further improve the flowability of flue gas in the energy-saving heat exchange device.

[0078] This device can dry the inner cavity of the circulation tube 4. The detailed steps are as follows:

[0079] After the boiler is shut down, the water pump is turned off, and the valve stem 73 is turned counterclockwise by 90 degrees so that one end of the L-shaped flow channel inside the valve body 72 is aligned with the connecting pipe 74 connecting to the heating box 77. Then, the air pump of the heating box 77 is started, so that hot air enters the area below the partition plate 3 through the connecting pipe 74 connecting to the air pump, the L-shaped flow channel inside the valve body 72, and the connecting pipe 74 connecting to the housing 1. Through the action of the flow stabilizing plate 75, the hot air flow is evenly distributed into each circulation pipe 4 tube bundle and exits from the outlet. Water pipe 78 is discharged. The hot air purging not only empties the residual low-temperature return water in circulation pipe 4, but also heats up the tube bundle of circulation pipe 4, thereby evaporating the acidic condensate adhering to the outer wall of the tube bundle of circulation pipe 4. This prevents the acidic condensate from corroding the tube wall of circulation pipe 4 after shutdown. After purging, turn valve stem 73 clockwise 90 degrees to return it to its initial position, so that one end of the L-shaped flow channel in valve body 72 is re-aligned with the connecting pipe 74 connecting to the circulation water tank for the next use.

[0080] In the above process, the flow stabilizing component in this device, through the direct connection design of the integrated three-way ball valve 71 and the housing 1, achieves rapid switching. It can replace the low-temperature return water in the circulation pipe 4 bundle with dry hot gas, and raise the temperature of the circulation pipe 4 wall. This causes the acidic condensate adsorbed on the pipe wall to evaporate, solving the problem that acidic condensate remains on the outer surface of the circulation pipe 4 bundle after the boiler is shut down, which leads to corrosion and reduces the condensation capacity during subsequent condensation.

[0081] The above description is merely an embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A heat exchanger for a condensing boiler, comprising a shell (1), characterized in that, The housing (1) is connected to an air inlet pipe and an air outlet pipe. The housing (1) is fixedly connected to a tube sheet (2) and a partition plate (3). The tube sheet (2) and the partition plate (3) are fixedly connected. Multiple circulation pipes (4) are fixedly connected to the tube sheet (2). A disturbance component is provided inside the housing (1). The disturbance component includes a baffle plate (51) fixedly connected inside the housing (1). Multiple baffle plates (51) are arranged in parallel with each other in a staggered manner. A disturbance plate (52) is rotatably connected to each baffle plate (51). A sleeve (53) is fixedly connected to the outer wall of the housing (1). A drive shaft (54) is rotatably connected inside the sleeve (53). Multiple multi-groove pulleys (55) are rotatably connected to the outer wall of the housing (1) and the end of the drive shaft (54). A bracket (56) is fixedly connected to the outer wall of the housing (1). A servo motor (57) is fixedly connected to the surface of the bracket (56). A crank (58) is rotatably connected to the bracket (56). A long rod (59) is rotatably connected to the bottom of the crank (58). An active plate (510) is rotatably connected to the long rod (59). The housing (1) is provided with a flow splitting assembly, which is located below the intake pipe. The flow splitting assembly includes a frame (61), and two frames (61) are symmetrically arranged. Each frame (61) is fixedly connected to the housing (1), and two guide plates (62) are fixedly connected to each frame (61).

2. The heat exchanger for a condensing boiler according to claim 1, characterized in that, Each of the baffle plates (51) is inclined, and each of the disturbance plates (52) has a toothed groove on its outer wall. Each of the disturbance plates (52) is fixedly connected to a nearby multi-groove pulley (55), wherein two of the multi-groove pulleys (55) are fixedly connected to a drive shaft (54), and each pair of multi-groove pulleys (55) are connected by a synchronous belt drive.

3. The heat exchanger for a condensing boiler according to claim 1, characterized in that, The output shaft of the servo motor (57) is fixedly connected to the crank (58), the active plate (510) is rotatably connected to the bracket (56), and the active plate (510) is fixedly connected to one of the multi-groove pulleys (55).

4. The heat exchanger for a condensing boiler according to claim 1, characterized in that, The diversion assembly includes a swing plate (63), two swing plates (63) are symmetrically arranged, each swing plate (63) is rotatably connected to a nearby guide plate (62), each frame (61) is symmetrically fixedly connected to the swing plate (63) with two springs (64), and each guide plate (62) is fixedly connected with a reset pad (65).

5. A heat exchanger for a condensing boiler according to claim 4, characterized in that, Each of the aforementioned guide plates (62) is inclined, and each of the aforementioned guide plates (62) and each swing plate (63) has a guide groove on its surface.

6. A heat exchanger for a condensing boiler according to claim 4, characterized in that, Each of the swing plates (63) abuts against two adjacent reset pads (65), and each of the swing plates (63) is arranged parallel to the guide plate (62).

7. A heat exchanger for a condensing boiler according to claim 1, characterized in that, The housing (1) is provided with a flow stabilizing component, which includes a three-way ball valve (71), a flow stabilizing plate (75) and a heating box (77). A valve body (72) is rotatably connected inside the three-way ball valve (71). An L-shaped flow channel is opened inside the valve body (72). A valve stem (73) is fixedly connected to the valve body (72). Three connecting pipes (74) are connected inside the three-way ball valve (71). A water outlet pipe (78) is provided at the end of the housing (1).

8. A heat exchanger for a condensing boiler according to claim 7, characterized in that, The valve stem (73) is rotatably connected to the three-way ball valve (71). One of the connecting pipes (74) is connected to the inside of the housing (1). The remaining two connecting pipes (74) are connected to the circulating water tank and the heating tank (77) respectively. The circulating water tank is equipped with a water pump and a cooling plate. The top of the circulating water tank is equipped with an exhaust hole. The water outlet pipe (78) is connected to the circulating water tank. The heating tank (77) is equipped with an air pump.

9. A heat exchanger for a condensing boiler according to claim 7, characterized in that, The flow stabilizer plate (75) has multiple holes (76). The diameter of the holes (76) in the central region of the flow stabilizer plate (75) is smaller than that of the holes (76) in the edge region. The density of the holes (76) in the central region of the flow stabilizer plate (75) is higher than that of the holes (76) in the edge region.

10. A method of using the condensing boiler heat exchanger according to claim 8, characterized in that: Includes the following steps: Step 1, Water return circulation: Confirm the connection status of the water circuit, start the water pump in the circulating water tank, so that the tube bundle of the circulating pipe (4) is filled with water, and the low temperature return water returns to the circulating water tank through the outlet pipe (78). When the low temperature return water forms a circulation loop, the heat exchanger enters the ready-to-run state. Step 2, Introduce flue gas: Turn on the boiler blower and use the blower to send the flue gas generated by the boiler combustion into the heat exchanger through the air inlet pipe. The flue gas equipment then enters the condensation and heat exchange operation state. Step 3, Shutdown and Purging: When shutting down, turn off the boiler and use a blower to purge the residual flue gas in the shell side. Then, cut off the water circuit and connect the dry hot air source. Use dry hot air to purge the tube side and the cavity after the valve to completely drain the residual water and the acidic condensate remaining on the outer wall of the evaporator tube bundle.

Images