Waste heat utilization device and application thereof in condensing boiler

Abstract

The present application relates to the technical field of condensing boiler, and particularly relates to a waste heat utilization device and application thereof in a condensing boiler, which comprises a boiler assembly, the boiler assembly comprises a boiler body, the top of the boiler body is provided with a condensing assembly, the condensing assembly comprises a box arranged on the boiler body, the inside of the box is provided with array-distributed condensing pipes, and the flat part of each condensing pipe is provided with a connecting assembly; the connecting assembly comprises a rotating piece, the two sides of the rotating piece are provided with connecting plates, the middle part of each connecting plate is rotationally connected with a rotating ring, and the rotating ring and the rotating piece are provided with array-distributed heat transfer pieces; the opposite side of each adjacent heat transfer piece is provided with a connecting piece, and the heat transfer piece close to the rotating piece is connected with the rotating piece through the connecting piece; the connecting assembly arranged on the condensing pipe can solve the technical problem that dust and other impurities in flue gas are easily attached in the low-speed area, thereby causing the heat exchange efficiency of the condensing pipe to be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of condensing boilers, in particular to a waste heat utilization device and its application in a condensing boiler. BACKGROUND

[0002] The main fuel used by traditional boilers is coal. Natural gas boilers have advantages such as environmental protection and energy saving compared with traditional coal-fired boilers.

[0003] The exhaust gas temperature of traditional gas boilers is generally high, up to about 200℃. The latent heat in the flue gas is not fully utilized, so the average thermal efficiency of the boiler is not very high, resulting in a huge loss of energy. A gas condensing boiler uses condensing technology. If the exhaust gas temperature of the boiler is reduced to a sufficiently low level, the water vapor in the flue gas in a superheated state will condense. By recovering the latent heat of the water vapor, the thermal efficiency of the gas condensing boiler will be significantly improved.

[0004] A patent with the application number CN202110865969.5 discloses an energy-saving gas condensing boiler convenient to maintain, which comprises a boiler body, a supporting frame fixedly connected to the lower side of the boiler body, a water inlet provided on the left end surface of the upper side of the boiler body, a water outlet provided on the right end surface of the lower side of the boiler body, a dismounting mechanism fixedly connected to the left end surface of the middle part of the boiler body, a burner connected to the left side of the dismounting mechanism, and a fixed head fixedly connected to the right side of the burner. The energy-saving gas condensing boiler convenient to maintain can quickly and conveniently dismount and install the burner, thereby effectively improving the maintenance efficiency of the energy-saving gas condensing boiler and facilitating the cleaning of the accumulated carbon on the inner wall of the combustion chamber, so that the thermal efficiency of the gas condensing boiler is improved.

[0005] Although the above-mentioned existing condensing boiler can improve the thermal efficiency of the condensing boiler, after the exhaust gas temperature is treated by the condensing technology of the existing gas condensing boiler, the low-temperature flue gas after treatment is still in a saturated state and contains a large amount of water vapor. A large amount of waste heat in the flue gas is not recovered and utilized.

[0006] At the same time, the condenser of the existing condensing boiler is mostly a finned tube, which strengthens heat transfer by expanding the heating surface. After the flue gas enters the condenser, it is in contact with the finned tube for heat transfer. After the flue gas contacts the finned tube, a low-speed area is generated on the back side of the flue gas of the finned tube, and dust and other impurities in the flue gas are easily attached to the low-speed area, causing the heat exchange efficiency of the finned tube to decrease. In addition, the dust attached to the surface of the pipeline and the expanded heating surface is not easy to clean, increasing the number and difficulty of maintenance.

[0007] Therefore, the application provides a waste heat utilization device and application thereof in a condensing boiler to solve the above technical problems of the prior art. SUMMARY

[0008] The application aims to provide a waste heat utilization device and application thereof in a condensing boiler, which forms turbulent flow on the circumferential side of the condensing pipe when the impeller rotates, eliminates the low-speed area on the condensing pipe, and avoids the accumulation of impurities in the low-speed area; the pusher and the connecting piece are arranged to improve the heat exchange efficiency of the condensing pipe and the flue gas, and avoid the waste heat in the flue gas from being recycled.

[0009] To achieve the above object, the application provides the following technical scheme.

[0010] A waste heat utilization device comprises a boiler assembly, wherein the boiler assembly comprises a boiler body, a condensing assembly is arranged on the top of the boiler body, the condensing assembly comprises a box arranged on the boiler body, an array of condensing pipes are arranged in the box, and a connecting assembly is arranged on the flat portion of each condensing pipe.

[0011] The connecting assembly comprises a rotating piece arranged on the middle portion of the flat portion of the condensing pipe, connecting plates are arranged on both sides of the rotating piece, a rotating ring is rotatably connected to the middle portion of the connecting plate, an array of heat transfer pieces are arranged between the rotating ring and the rotating piece, and the heat transfer pieces are movably connected to the condensing pipe.

[0012] One side of each heat transfer piece adjacent to the rotating piece is connected to the rotating piece through a connecting piece, and the other side of each heat transfer piece adjacent to the connecting plate is connected to the rotating ring through a pusher, and a protective sleeve is arranged on the outer side of the pusher.

[0013] The heat transfer pieces on the upper and lower condensing pipes are arranged in a staggered manner.

[0014] Preferably, the rotating piece comprises a fixed portion movably connected to the flat portion of the condensing pipe, an impeller is arranged on the outer side of the fixed portion, an array of locking pieces are arranged at the connection between the fixed portion and the impeller, and the connecting piece is connected to the impeller.

[0015] When the locking pieces are in the pop-up state, the fixed portion and the impeller are in the fixed connection state; and when the locking pieces are in the retracted state, the fixed portion and the impeller are in the rotary connection state.

[0016] Preferably, the heat transfer piece comprises a ball part, which is in sliding connection with the straight part of the condensing pipe, the outer side of the ball part is provided with a movable part, the outer side of the movable part is provided with a fin, the fin is symmetrically provided with a movable slot, and the movable slot is located at the connection between the fin and the connecting piece.

[0017] A connecting rod is connected in the movable slots on the plurality of fins, one end of the connecting rod is connected with the rotating ring, and the other end of the connecting rod is connected with the fixed part.

[0018] Preferably, the connecting piece comprises an elastic piece, the elastic piece is arranged on the outer side of the connecting rod, the size of the elastic piece is greater than the size of the movable slot, the outer side of the elastic piece is provided with a flexible sleeve, and the flexible sleeve covers the elastic piece.

[0019] The elastic piece and the flexible sleeve are fixedly connected with the fixed part.

[0020] Preferably, the condensing assembly further comprises a smoke exhaust pipe arranged at the end of the box body, the smoke exhaust pipe is internally provided with a flow detector for detecting the flow of flue gas; one end of the smoke exhaust pipe away from the box body is provided with a smoke inlet pipe.

[0021] The bottom of the box body is provided with an inclined part, the height of the inclined part towards one end of the smoke inlet pipe is greater than the height of the inclined part towards one end of the smoke exhaust pipe, and the lowest part of the inclined part is provided with a drainage part.

[0022] Preferably, the outer side of the box body is provided with a water inlet part and a water outlet part, the water inlet part is connected with the water inlet end of the condensing pipe, the water outlet part is connected with the water outlet end of the condensing pipe, the other end of the water outlet part is connected with the boiler body in communication, and the water outlet end of the condensing pipe is provided with a temperature detector for detecting the water temperature.

[0023] Preferably, the boiler assembly further comprises a burner arranged at the end of the boiler body, the end of the burner is provided with a corrugated baffle, the corrugated baffle is located in the inside of the boiler body, the other end of the corrugated baffle is provided with a smoke return box, one end of the smoke return box away from the corrugated baffle is provided with an explosion-proof pipe, the top of the smoke return box is provided with an array of return pipes, and one end of the return pipe away from the smoke return box is connected with a front smoke box.

[0024] Preferably, the front smoke box is located at the end of the boiler body close to the burner, the top of the front smoke box is provided with a connecting pipe, and the connecting pipe is in communication with the condensing assembly.

[0025] The inside of the front smoke box is provided with an isolation pipe, one end of the isolation pipe is connected with the output end of the burner, and the other end of the isolation pipe is in communication with the corrugated baffle.

[0026] The application of a waste heat utilization device in a condensing boiler, when the condensing assembly is used to heat-exchange treat flue gas, a low-speed area is generated on the back side of the condensing pipe, and dust and other impurities in the flue gas are easily attached to the low-speed area, causing the heat exchange efficiency of the condensing pipe to decrease, and the waste heat utilization device needs to be used for auxiliary treatment.

[0027] Technical effects and advantages of the present application:

[0028] 1. The present application is provided with an impeller and a connecting rod, after the flue gas enters the inside of the box through the smoke inlet pipe, the flue gas drives the impeller to rotate, the impeller drives the fins to rotate through the connecting rod, and the turbulent flow is formed on the side of the condensing pipe, on the one hand, the contact time of the flue gas and the heat exchange pipe is improved, and the waste heat utilization efficiency is improved, on the other hand, the low-speed area on the condensing pipe is eliminated, and the dust in the flue gas is prevented from accumulating in the low-speed area.

[0029] 2. The present application is provided with a pushing piece and a connecting piece, when the heat exchange efficiency between the condensing pipe and the flue gas is detected to be low, the pushing piece is controlled to push the fins to move towards the direction of the impeller, thereby shortening the spacing between the fins and improving the heat exchange efficiency between the condensing pipe and the flue gas, when the working power of the boiler body is detected to be too high, causing too much flue gas generated by the burner, the pushing piece is controlled to drive the fins to deflect, so that in the process of the impeller driving the fins to rotate, the fins lift the condensate flowing to the inclined part, so that the condensate contacts and exchanges heat with the flue gas, the heat exchange efficiency of the flue gas is improved, and the temperature of the flue gas discharged is prevented from being too high. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a schematic diagram of the main structure of the present application;

[0031] Figure 2 It is a schematic diagram of the internal structure of the boiler body of the present application;

[0032] Figure 3 It is a schematic diagram of the front structure of the condensing assembly of the present application;

[0033] Figure 4 It is a schematic diagram of the back structure of the condensing assembly of the present application;

[0034] Figure 5 It is a schematic diagram of the internal structure of the condensing assembly of the present application;

[0035] Figure 6 It is a schematic diagram of the distribution of the heat transfer piece in the box of the present application;

[0036] Figure 7 It is a schematic diagram of the structure of the connecting assembly of the present application;

[0037] Figure 8 It is a schematic diagram of the structure of the pushing piece of the present application;

[0038] Figure 9 Structure diagram of the locking member of the present application;

[0039] Figure 10 Structure diagram of the rotating direction of the heat transfer member of the present application;

[0040] Figure 11 Structure diagram of the cross section of the connecting assembly of the present application;

[0041] Figure 12 Structure diagram of the state of the fins after deflection of the present application;

[0042] Figure 13 Structure diagram of the distribution of the fins on the upper and lower condensing pipes of the present application.

[0043] In the figure: 1, condensing assembly; 101, smoke inlet pipe; 102, box body; 103, smoke outlet pipe; 104, inclined part; 105, water outlet part; 106, condensing pipe; 107, water inlet part; 108, water outlet part; 2, connecting assembly; 201, rotating member; 2011, fixed part; 2012, impeller; 2013, locking member; 202, heat transfer member; 2021, ball part; 2022, movable part; 2023, fin; 2024, movable groove; 203, connecting member; 2031, flexible sleeve; 2032, elastic member; 204, connecting plate; 205, rotating ring; 206, pushing member; 207, protective sleeve; 3, connecting rod; 4, boiler assembly; 401, boiler body; 402, burner; 403, furnace; 404, smoke return box; 405, return pipe; 406, front smoke box; 407, connecting pipe. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0045] Embodiment 1:

[0046] Reference Figures 1 to 5As shown, the embodiment provides a condensing boiler with waste heat utilization device, which comprises a boiler assembly 4, the boiler assembly 4 comprises a boiler body 401, one end of the boiler body 401 is provided with a front smoke box 406, the outer side of the front smoke box 406 is provided with a burner 402, the output end of the burner 402 passes through the front smoke box 406 and is connected with a corrugated furnace 403, the corrugated furnace 403 is located in the inside of the boiler body 401, the other end of the corrugated furnace 403 is provided with a return smoke box 404, the end of the return smoke box 404 away from the corrugated furnace 403 is provided with an explosion-proof pipe, the top of the return smoke box 404 is provided with an array of return pipes 405, the end of the return pipe 405 away from the return smoke box 404 is connected with the front smoke box 406, and the top of the front smoke box 406 is provided with a condensing assembly 1.

[0047] The flue gas enters the return smoke box 404 from the corrugated furnace 403, and then enters the inside of the front smoke box 406 through the return pipe 405, and the front smoke box 406 sends the flue gas into the condensing assembly 1. The condensing assembly 1 cools the flue gas to meet the emission temperature.

[0048] The front smoke box 406 is located at one end of the boiler body 401 close to the burner 402, the top of the front smoke box 406 is provided with a connecting pipe 407, the connecting pipe 407 is connected with the condensing assembly 1. The inside of the front smoke box 406 is provided with an isolation pipe, one end of the isolation pipe is connected with the output end of the burner 402, and the other end of the isolation pipe is connected with the corrugated furnace 403.

[0049] The isolation pipe is arranged so that the burner 402 directly acts on the corrugated furnace 403 without affecting the flue gas in the front smoke box 406.

[0050] The condensing assembly 1 comprises a smoke inlet pipe 101, a box body 102, a smoke exhaust pipe 103 and a condensing pipe 106.

[0051] The box body 102 is arranged at the top of the boiler body 401, one end of the box body 102 is connected with the smoke exhaust pipe 103, the other end of the box body 102 is connected with the smoke inlet pipe 101, the input end of the smoke inlet pipe 101 is connected with the connecting pipe 407, the condensing pipe 106 is arranged in the inside of the box body 102 and is arranged in an array, one end of the condensing pipe 106 is connected with a water inlet portion 107 arranged on the box body 102, the other end of the condensing pipe 106 is connected with a water outlet portion 108 arranged on the box body 102, and the other end of the water outlet portion 108 is connected with the inside of the boiler body 401.

[0052] In use, fuel air is mixed and injected into the corrugated baffle 403 through the fuel supply system and the burner 402, and the fuel is combusted at a slightly positive pressure in the corrugated baffle 403. The high temperature generated by the combustion is transferred to the front smoke box 406 through the return smoke box 404 and the return pipe 405, and then the smoke gas is sent into the condensing assembly 1 through the connecting pipe 407. In the condensing assembly 1, the remaining heat of the smoke gas is fully utilized to convert into effective power of the boiler.

[0053] The smoke gas enters the inside of the box 102 through the smoke inlet pipe 101. The condensing pipe 106 in the inside of the box 102 is in contact with the smoke gas, and the condensing pipe 106 cools the smoke gas. Finally, the smoke gas is discharged from the smoke outlet pipe 103.

[0054] It should be noted that when the condensing assembly 1 is working, the external water pump passes the cooling water into the condensing pipe 106 through the water inlet part 107. When the smoke gas passes the outside of the condensing pipe 106, the temperature of the smoke gas is reduced by using the cooling water. When the temperature is below the dew point of the water, the water in the smoke gas is condensed into water. At the same time, the high-temperature smoke gas increases the temperature of the cooling water in the condensing pipe 106. The heated cooling water can be directly returned to the inside of the boiler through the water outlet part 108 and participate in the heating effect of the water in the inside of the boiler, thereby improving the efficiency of the boiler to generate saturated steam.

[0055] Embodiment 2

[0056] Although the condensing device arranged on the boiler body can reduce the exhaust temperature of the smoke gas to a certain extent and improve the efficiency of the boiler to generate saturated steam, after the smoke gas is in contact with the condensing pipe 106, a low-speed area is generated on the back side of the condensing pipe 106. The dust and other impurities in the smoke gas are easily attached to the low-speed area, which causes the heat exchange efficiency of the condensing pipe 106 to decrease. In addition, the dust attached between the surface of the pipe and the extended heating surface is not easy to clean, which increases the number and difficulty of maintenance.

[0057] In view of this, the embodiment is arranged with the connecting assembly 2 on the condensing pipe 106 to solve the technical problem that the dust and other impurities in the smoke gas are easily attached to the low-speed area, which causes the heat exchange efficiency of the condensing pipe 106 to decrease.

[0058] The difference between the embodiment 1 and the embodiment 2 is that:

[0059] Reference Figures 1 to 13As shown, the straight part of the single condensing pipe 106 is provided with a connecting assembly 2, the connecting assembly 2 comprises a rotating part 201, the rotating part 201 is arranged at the middle part of the straight part of the condensing pipe 106, the two sides of the rotating part 201 are provided with connecting plates 204, the middle part of the connecting plate 204 is rotatably connected with a rotating ring 205, the rotating ring 205 and the rotating part 201 are provided with arrayed heat transfer parts 202, the heat transfer part 202 is movably connected with the condensing pipe 106, the opposite side of two adjacent heat transfer parts 202 is provided with a connecting part 203, the heat transfer part 202 close to the rotating part 201 is connected with the rotating part 201 through the connecting part 203, the heat transfer part 202 close to the connecting plate 204 is connected with the rotating ring 205 through a pushing part 206, the outer side of the pushing part 206 is provided with a protective sleeve 207.

[0060] The heat transfer parts 202 on the upper and lower condensing pipes 106 are staggered.

[0061] The rotating part 201 is driven to rotate by the flue gas, the connecting part 203 and the heat transfer part 202 are synchronously rotated in the process of the rotating part 201 rotating, because the rotating directions of the rotating parts 201 on the upper and lower condensing pipes 106 are consistent, in the process of the rotating part 201 rotating, the turbulent flow is formed on the side of the heat transfer part 202, on the one hand, the contact time of the flue gas and the heat transfer pipe is increased, the waste heat utilization efficiency is improved, on the other hand, the low speed area on the condensing pipe 106 is eliminated, the dust in the flue gas is prevented from accumulating in the low speed area.

[0062] It should be noted that the telescopic end of the pushing part 206 is hinged with the heat transfer part 202.

[0063] The rotating part 201 comprises a fixed part 2011, the fixed part 2011 is fixedly connected with the straight part of the condensing pipe 106, the outer side of the fixed part 2011 is provided with an impeller 2012, the connecting part 203 is connected with the impeller 2012, and the connecting part 203 is provided with arrayed locking parts 2013.

[0064] When the locking part 2013 is in the pop-up state, the fixed part 2011 and the impeller 2012 are in the fixed connection state; when the locking part 2013 is in the retracted state, the fixed part 2011 and the impeller 2012 are in the rotary connection state. By controlling the pop-up and retraction of the locking part 2013, the rotation and stop of the impeller 2012 can be controlled, so as to adapt to the specific work of the connecting assembly 2 of the box body 102 under different working conditions.

[0065] The heat transfer member 202 comprises a ball portion 2021 which is in sliding connection with the flat portion of the condensing pipe 106, the outer side of the ball portion 2021 is provided with a movable portion 2022, the outer side of the movable portion 2022 is provided with fins 2023, the fins 2023 are symmetrically provided with movable grooves 2024, and the movable grooves 2024 are located at the connection position of the fins 2023 and the connecting member 203; the combination mode of the ball portion 2021 and the movable portion 2022 is similar to the universal ball structure, and specific as shown in Figure 9 The specific structure is not described here in detail.

[0066] The movable grooves 2024 on the plurality of fins 2023 are jointly connected with a connecting rod 3, one end of the connecting rod 3 is connected with a rotating ring 205, and the other end of the connecting rod 3 is connected with the fixed portion 2011.

[0067] It should be noted that the size of the movable groove 2024 is greater than that of the connecting rod 3, and the shape of the movable groove 2024 comprises a rectangle, a circle or a square.

[0068] The connecting member 203 comprises an elastic member 2032, the elastic member 2032 is arranged on the outer side of the connecting rod 3, the size of the elastic member 2032 is greater than that of the movable groove 2024, the outer side of the elastic member 2032 is provided with a flexible sleeve 2031, and the flexible sleeve 2031 covers the elastic member 2032.

[0069] The elastic member 2032 and the flexible sleeve 2031 are fixedly connected with the fixed portion 2011.

[0070] The bottom of the box body 102 is provided with an inclined portion 104, the height of the inclined portion 104 towards one end of the smoke inlet pipe 101 is greater than the height of the inclined portion 104 towards one end of the smoke exhaust pipe 103, and the lowest part of the inclined portion 104 is provided with a drainage portion 105.

[0071] After the flue gas contacts the condensing pipe 106, the temperature of the flue gas is reduced by using the cooling water in the condensing pipe 106, when the temperature is below the dew point of water, the water contained in the flue gas is condensed into water, and falls to the bottom of the box body 102 along the fins 2023, and the water falling to the bottom of the box body 102 flows to the drainage portion 105 along the inclined portion 104, which is convenient for final treatment.

[0072] In this embodiment, the inside of the smoke exhaust pipe 103 is provided with a flow detector for detecting the flow of flue gas, and the outlet end of the condensing pipe 106 is provided with a temperature detector for detecting the temperature of water, by detecting the value change between the flow detector and the temperature detector, the specific situation of the flue gas running in the box body 102 is judged, and according to different situations, the connecting assembly 2 is controlled to make corresponding changes, so as to ensure the heat exchange efficiency of the condensing pipe 106.

[0073] The boiler is externally provided with a control assembly, which comprises a control terminal for controlling all electrical components to work.

[0074] In the initial state, the pushing member 206 is in the elongated state, the elastic member 2032 is in the compressed state, the locking member 2013 is in the retracted state, and the fixed part 2011 and the impeller 2012 are in the rotating connection state.

[0075] It should be noted that the locking member 2013 comprises an electromagnetic bolt, which is arranged in the fixed part 2011, and the inner side of the impeller 2012 is provided with an array of insertion slots, which are matched with the extension end of the electromagnetic bolt. When the electromagnetic bolt is in the retracted state, the electromagnetic bolt is out of contact with the insertion slot, and the fixed part 2011 and the impeller 2012 are in the rotating connection state. When the electromagnetic bolt is in the ejected state, the electromagnetic bolt is inserted into the insertion slot, and the fixed part 2011 and the impeller 2012 are in the fixed connection state.

[0076] In use, the flue gas discharged from the front smoke box 406 enters the inside of the box 102 through the smoke inlet pipe 101. After entering the box 102, the flue gas contacts the condensing pipe 106 on one hand, and reduces the temperature of the flue gas by using the cooling water in the condensing pipe 106. On the other hand, the impeller 2012 is driven to rotate, and the rotating ring 205 is driven to rotate by the connecting rod 3 in the process of rotating the impeller 2012. In the process of rotating the connecting rod 3, the fin 2023 is synchronously driven to rotate around the ball part 2021.

[0077] It should be noted that in the process of driving the rotating ring 205 to rotate by the connecting rod 3, the connecting rod 3 extrudes the movable slot 2024 on the fin 2023, thereby driving the fin 2023 to rotate around the ball part 2021.

[0078] Since the rotating directions of the impellers 2012 on the upper and lower condensing pipes 106 are consistent (as shown in the specific Figure 10 As shown), in the process of driving the fin 2023 to rotate by the impeller 2012, a turbulent flow is formed on the circumferential side of the condensing pipe 106, which on one hand increases the contact time of the flue gas with the heat exchange pipe, and on the other hand eliminates the low-speed area on the condensing pipe 106, thereby avoiding the dust in the flue gas from accumulating in the low-speed area.

[0079] In the process of heat exchange of the condensing pipe 106 on the flue gas, the control terminal detects the value change between the flow detector inside the smoke exhaust pipe 103 and the temperature detector at the water outlet end of the condensing pipe 106, judges the specific situation of the flue gas running in the box 102, and controls the connecting assembly 2 to make corresponding changes according to different situations.

[0080] When the control terminal detects that the value detected by the flow detector is in the normal state, but the value detected by the temperature detector is lower than the set value, it indicates that the spacing between the fins 2023 is too large, resulting in a smaller heat exchange efficiency between the condenser pipe 106 and the flue gas. At this time, the control terminal controls the pusher 206 connected with the rotating ring 205 to extend, and the pusher 206 pushes the fins 2023 on the side close to the connecting plate 204 to move towards the impeller 2012. In the process of moving of the fins 2023, the connecting piece 203 synchronously drives the remaining fins 2023 to move towards the impeller 2012, thereby shortening the spacing between the fins 2023 and improving the heat exchange efficiency between the condenser pipe 106 and the flue gas.

[0081] It should be noted that when the pusher 206 pushes the fins 2023 to move towards the impeller 2012, the fins 2023 synchronously extrude the elastic piece 2032, so that the distance between the fins 2023 changes equidistantly.

[0082] The elastic piece 2032 includes a spring, and the elastic piece 2032 between the fins 2023 is equidistantly distributed, that is, when the pusher 206 pushes one fin 2023 to move along the condenser pipe 106, the pushing force is transmitted to the next fin 2023 through the elastic piece 2032, so that the force received by each elastic piece 2032 is equal, and the distance between the fins 2023 is equidistantly reduced.

[0083] It should be noted that the pusher 206 includes an electric push rod, and since the pushers 206 are symmetrically distributed on the rotating ring 205, the pushing forces applied by the two pushers 206 to the fins 2023 are consistent during the process of pushing the fins 2023 to move.

[0084] When the control terminal detects that the value detected by the flow detector is higher than the set value, but the value detected by the temperature detector is higher than the set value, it indicates that the working power of the burner 402 is too high, and more heat and flue gas are generated, so that the amount of flue gas discharged from the smoke exhaust pipe 103 increases, and the water temperature flowing out of the water outlet of the condenser pipe 106 increases. At this time, the control terminal controls the working power of the burner 402 to be reduced to reduce the amount of flue gas generated by the burner 402.

[0085] The method of reducing flue gas by reducing power is relatively slow, so when the control terminal reduces the working power of the burner 402, the control terminal controls the fins 2023 to change the shape to further reduce the discharge temperature of the flue gas.

[0086] The specific steps are: the inside of the impeller 2012 is provided with a torque sensor, when the control terminal detects that the plane formed by the two opposite connecting rods 3 is parallel to the top of the box body 102 (i.e. the state of the connecting rod 3 is as shown in the figure Figure 9As shown), the control system controls the locking member 2013 to pop out, and after the locking member 2013 pops out, the impeller 2012 and the fixing portion 2011 are in a fixed connection state.

[0087] by Figure 6 For example, after the impeller 2012 and the fixing part 2011 are in a fixed connection state, the control system controls the connecting component 2 on the condenser 106 at the bottom of the box body 102 to perform corresponding actions, specifically controlling one of the pushers 206 on the rotating ring 205 to contract. Since the telescopic end of the pusher 206 is hinged to the fin 2023, and the size of the movable groove 2024 is larger than the size of the connecting rod 3, after the pusher 206 contracts, the fin 2023 deflects around the ball part 2021 under the influence of the elastic restoring force of the elastic member 2032. Then, the locking member 2013 on the condenser 106 at the bottom of the box body 102 is controlled to contract, so that the impeller 2012 and the fixing part 2011 are in a rotationally connected state. Since the fin 2023 is in a deflected state (the state of the fin 2023 at this time is as shown in FIG. Figure 12 As shown in FIG, when the impeller 2012 drives the fins 2023 to rotate under the impetus of the flue gas, the fins 2023 lift up the condensed water flowing to the inclined portion 104, so that the condensed water contacts and exchanges heat with the flue gas, thereby improving the heat exchange efficiency of the flue gas and preventing the exhaust temperature of the flue gas from being too high.

[0088] When the control terminal detects that the value detected by the flow detector is lower than the set value and the value detected by the temperature detector is also lower than the set value, it indicates that there are too many impurities adhering to the condenser 106, resulting in a decrease in the heat exchange efficiency of the condenser 106. At the same time, the impurities block the flue gas channel in the box 102, causing the flow rate of flue gas discharged from the exhaust pipe 103 to be less than the set value.

[0089] by Figure 6 For example, the control terminal controls the locking member 2013 on the rotating member 201 in the middle of the box body 102 to pop out, so that the fins 2023 on the condenser tube 106 in the middle of the box body 102 stop rotating, and the rotation of the fins 2023 in other positions is not affected. Then, the pushing member 206 corresponding to the condenser tube 106 in the middle of the box body 102 is controlled to continuously extend and retract. Since the heat transfer members 202 on the upper and lower condenser tubes 106 are staggered (specifically, Figure 13 As shown), during the continuous extension and retraction of the pusher 206, the fin 2023 located in the middle is able to move back and forth between the two fins 2023, so that the fin 2023 located in the middle can clean the impurities adhering to the fins 2023 on both sides, so that the channel for the smoke to flow between the fins 2023 is restored to be unobstructed, thereby preventing the smoke from being in a blocked state in the box body 102 for a long time, affecting the safe operation of the box body 102.

[0090] It should be noted that the distribution of the condenser tube 106 in the embodiment is as shown in the figure, but in actual application, the fins 2023 on the condenser tube 106 between the upper and lower condenser tubes 106 can be controlled to clean the flue gas passage according to the number of condenser tubes 106 arranged. Figure 6

[0091] By arranging the pushing member 206 and the connecting member 203, when it is detected that the heat exchange efficiency between the condenser tube 106 and the flue gas is low, the pushing member 206 is controlled to push the fins 2023 to move in the direction of the impeller 2012, thereby shortening the spacing between the fins 2023 and improving the heat exchange efficiency between the condenser tube 106 and the flue gas; when it is detected that the working power of the boiler body 401 is too high, causing too much flue gas generated by the burner 402, the pushing member 206 is controlled to drive the fins 2023 to deflect, so that in the process of the impeller 2012 driving the fins 2023 to rotate, the fins 2023 lift the condensate flowing to the inclined part 104, so that the condensate contacts and exchanges heat with the flue gas, improving the heat exchange efficiency of the flue gas and avoiding that the temperature of the flue gas discharged is too high; when it is detected that too much impurities adhere to the condenser tube 106, causing the heat exchange efficiency of the condenser tube 106 to decrease, the pushing member 206 corresponding to the condenser tube 106 in the middle of the box body 102 is continuously stretched and contracted, so that the fins 2023 in the middle can clean the impurities adhering to the fins 2023 distributed on both sides, so that the passage through which the flue gas flows between the fins 2023 is restored to be smooth.

[0092] Although the embodiments of the present application have been shown and described, various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.​

Claims

1. A waste heat utilization device characterized by comprising: The application relates to a boiler assembly (4) which comprises a boiler body (401), the top of the boiler body (401) being provided with a condensing assembly (1), the condensing assembly (1) comprising a box (102) arranged on the boiler body (401), the inside of the box (102) being provided with arrayed condensing pipes (106), and the flat part of each condensing pipe (106) being provided with a connecting assembly (2); The connecting assembly (2) comprises a rotating part (201) arranged at the middle part of the flat part of the condensing pipe (106), the two sides of the rotating part (201) being provided with connecting plates (204), the middle part of each connecting plate (204) being rotatably connected with a rotating ring (205), and the rotating ring (205) and the rotating part (201) being provided with arrayed heat transfer parts (202) which are movably connected with the condensing pipe (106); The opposite side of each two adjacent heat transfer parts (202) is provided with a connecting part (203), the heat transfer part (202) close to the rotating part (201) is connected with the rotating part (201) through the connecting part (203), and the heat transfer part (202) close to the connecting plate (204) is connected with the rotating ring (205) through a pushing part (206), and the outer side of the pushing part (206) is provided with a protective sleeve (207); The heat transfer parts (202) on the upper and lower condensing pipes (106) are staggered; The rotating part (201) comprises a fixed part (2011) which is fixedly connected with the flat part of the condensing pipe (106), the outer side of the fixed part (2011) is provided with an impeller (2012), the connecting part between the fixed part (2011) and the impeller (2012) is provided with arrayed locking parts (2013), and the connecting part (203) is connected with the impeller (2012); When the locking parts (2013) are in the pop-up state, the fixed part (2011) and the impeller (2012) are in the fixed connection state; when the locking parts (2013) are in the retracted state, the fixed part (2011) and the impeller (2012) are in the rotary connection state.

2. The waste heat utilization device according to claim 1, characterized by The heat transfer part (202) comprises a ball part (2021) which is slidably connected with the flat part of the condensing pipe (106), the outer side of the ball part (2021) is provided with a movable part (2022), the outer side of the movable part (2022) is provided with fins (2023), the fins (2023) are symmetrically provided with movable grooves (2024), and the movable grooves (2024) are located at the connecting part between the fins (2023) and the connecting part (203). The movable slots (2024) on the plurality of fins (2023) are jointly connected with a connecting rod (3), one end of the connecting rod (3) is connected with the rotating ring (205), and the other end of the connecting rod (3) is connected with the fixed part (2011).

3. The waste heat utilization device according to claim 2, characterized by The connecting piece (203) comprises an elastic piece (2032), the elastic piece (2032) is arranged on the outer side of the connecting rod (3), the size of the elastic piece (2032) is greater than the size of the movable slot (2024), and the outer side of the elastic piece (2032) is provided with a flexible sleeve (2031) which covers the elastic piece (2032). The elastic piece (2032) and the flexible sleeve (2031) are fixedly connected with the fixed part (2011).

4. The waste heat utilization device according to claim 1, characterized by The condensing assembly (1) further comprises a smoke exhaust pipe (103) arranged at the end of the box body (102), the inside of the smoke exhaust pipe (103) is provided with a flow detector for detecting the flow of flue gas, one end of the smoke exhaust pipe (103) away from the box body (102) is provided with a smoke inlet pipe (101). The bottom of the box body (102) is provided with an inclined part (104), the height of the inclined part (104) towards one end of the smoke inlet pipe (101) is greater than the height of the inclined part (104) towards one end of the smoke exhaust pipe (103), and the lowest part of the inclined part (104) is provided with a drainage part (105).

5. The waste heat utilization device according to claim 1, characterized by The outside of the box body (102) is provided with a water inlet part (107) and a water outlet part (108), the water inlet part (107) is connected with the water inlet end of the condensing pipe (106), the water outlet part (108) is connected with the water outlet end of the condensing pipe (106), and the other end of the water outlet part (108) is connected with the boiler body (401) in communication; the water outlet end of the condensing pipe (106) is provided with a temperature detector for detecting the water temperature.

6. The waste heat utilization device according to claim 1, characterized by The boiler assembly (4) further comprises a burner (402) arranged at the end of the boiler body (401), the end of the burner (402) is provided with a corrugated baffle (403), the corrugated baffle (403) is located in the inside of the boiler body (401), the other end of the corrugated baffle (403) is provided with a smoke return box (404), one end of the smoke return box (404) away from the corrugated baffle (403) is provided with an anti-explosion pipe, and the top of the smoke return box (404) is provided with an array of return pipes (405), one end of the return pipe (405) away from the smoke return box (404) is connected with a front smoke box (406).

7. The waste heat utilization device according to claim 6, characterized in that The front smoke box (406) is located at one end of the boiler body (401) close to the burner (402), the top of the front smoke box (406) is provided with a connecting pipe (407), and the connecting pipe (407) is connected with the condensing assembly (1) in communication. The inside of the front smoke box (406) is provided with an isolation pipe, one end of the isolation pipe is connected with the output end of the burner (402), and the other end of the isolation pipe is connected with the corrugated baffle (403) in communication.

8. Use of a waste heat utilization device according to any one of claims 1 to 7 in a condensing boiler.

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