A combined system integrated heat exchange device

Abstract

The present invention discloses a combined system integrated heat exchange device, including a bottom support assembly, a smoke box supported on the bottom support assembly, an inlet and an outlet respectively arranged at the front and rear ends of the smoke box; the inlet of the smoke box is docked with an inlet flue through a compensation element, and the outlet of the smoke box is docked with an outlet flue through a compensation element, and a serpentine heat exchanger and a radial heat pipe heat exchanger are sequentially arranged in the smoke box along the direction of flue gas flow according to the temperature difference of the flue. The advantages of the present invention are: giving full play to the potential of two different heat exchangers; effectively improving the heat exchange efficiency through integrated control; the serpentine heat exchanger is supported by a vibration reduction system and the radial heat pipe heat exchanger is supported by a vibration reduction star net, ensuring the safety and stability of the equipment, effectively extending the equipment operation life, and reducing the comprehensive operation cost.

Description

Technical Field

[0001] The invention relates to the technical field of energy-saving equipment, and in particular to a combined system integrated heat exchange device. Background Art

[0002] Coal-fired power is one of the main energy sources for my country's electricity supply. How to improve the production efficiency of the coal-fired power industry, the recovery of flue gas waste heat from coal-fired power generation is crucial, with huge energy-saving potential and broad market prospects. The existing industrial boiler flue gas waste heat recovery equipment mainly uses a single serpentine tube heat exchanger. The disadvantages of this single serpentine tube heat exchanger are: (1) low heat exchange efficiency. Since the heat exchange tubes passing cooling water in the serpentine tube heat exchanger are in direct contact with the flue gas for heat exchange, and since the flue gas of industrial boilers contains acidic substances such as sulfur, the temperature in the low temperature zone (flue gas outlet section) is lower than the dew point of the acidic substances. The acidic substances will condense on the tube wall and corrode the tube shell of the finned tube. The operating stability and reliability of the finned tube heat exchanger are poor, and the service life is short; (2) The heat exchange tube is prone to long-term and large-scale continuous vibration during operation. When the heat exchange tube vibrates for a long time and continuously, it is not only easy to cause collisions between adjacent heat exchange tubes, but also the tube wall will gradually become thinner due to wear over time, and finally cause the heat exchange tube to crack; and long-term vibration is easy to cause the joints between the heat exchange tube and the connecting elbow to leak and fail due to fatigue loosening or weld cracking, resulting in poor operating stability. Summary of the invention

[0003] The object of the present invention is to provide a combined system integrated heat exchange device with high heat exchange efficiency and high operation stability.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a combined system integrated heat exchange device, including a bottom support assembly, a smoke box is supported on the bottom support assembly, and an inlet and an outlet are respectively arranged at the front and rear ends of the smoke box; the inlet of the smoke box is connected to the inlet flue through a compensation element, and the outlet of the smoke box is connected to the outlet flue through a compensation element, and a serpentine heat exchanger and a radial heat pipe heat exchanger are arranged in sequence in the smoke box along the direction of smoke flow;

[0005] The serpentine heat exchanger comprises a plurality of serpentine heat exchange modules, each of which comprises: a serpentine heat exchange module frame, a serpentine water inlet header and a serpentine water outlet header. A plurality of finned tubes are supported between the left and right tube sheets of the serpentine heat exchange module frame. The finned tubes are arranged in a plurality of layers in the vertical direction. The finned tubes of each layer are connected by a plurality of elbows to form a plurality of independent parallel serpentine heat exchange pipelines. A vibration reduction support assembly for vibration reduction and position limiting of the finned tubes of each layer is provided below each layer of finned tubes. The inlets of all serpentine heat exchange pipelines are connected in parallel at the same time. Connect the serpentine tube water inlet header, and the outlets of all serpentine heat exchange tubes are simultaneously connected in parallel to the serpentine tube water outlet header; the vibration reduction support assembly includes: a support support plate, on which a plurality of positioning notches are arranged at intervals, each positioning notch of the support support plate corresponds to each fin tube of each layer of fin tubes, and a pair of vibration reduction limit ears for limiting the fins on the fin tubes placed in the positioning notches are symmetrically arranged on the groove walls on both sides of each positioning notch, and a damping spring for supporting the tube body of the fin tube placed in the positioning notch is arranged at the groove bottom of each positioning notch;

[0006] The radial heat pipe heat exchanger comprises a plurality of radial heat pipe modules, each of which comprises: a heat pipe module frame, a heat pipe water inlet header and a heat pipe water outlet header, a plurality of horizontal radial heat pipes are supported between the left and right side plates of the heat pipe module frame, a pipe end sealing structure is provided between the pipe end of each radial heat pipe and the corresponding side plate, the radial heat pipes are arranged into a plurality of layers in the vertical direction and into a plurality of rows along the direction of flue gas flow, the inner pipes of each row of radial heat pipes form a plurality of independent and parallel heat pipe heat exchange pipelines through a plurality of bent pipes, and each layer of radial heat pipes is provided with a plurality of layers of radial heat pipes. The tubes are connected and fixed together by tube clamps, and a star chain vibration reduction net is arranged on the heat pipe module frame. The star chain vibration reduction net has mesh holes corresponding to all radial heat pipes respectively, and the star chain vibration reduction net is inserted into all radial heat pipes through the mesh holes to simultaneously reduce vibration and limit the position of all radial heat pipes; the inlets of all heat pipe heat exchange pipelines are simultaneously connected in parallel to the heat pipe water inlet header, and the outlets of all heat pipe heat exchange pipelines are simultaneously connected in parallel to the heat pipe water outlet header; a flue gas flow abnormality alarm system is arranged on the smoke box between the serpentine tube heat exchanger and the radial heat pipe heat exchanger.

[0007] Furthermore, in the aforementioned combined system integrated heat exchange device, a header fixing assembly for fixing the header of the serpentine tube heat exchanger is provided on the smoke box, and the structure of the header fixing assembly includes: a header bracket fixedly mounted on the smoke box, and a plurality of U-shaped bolts, each U-shaped bolt is buckled on the outside of the header through its U-shaped bayonet, and both ends of the U-shaped bolt simultaneously pass through the header bracket and are threadedly connected with locking nuts, and when the locking nuts are tightened, the U-shaped bolts can tighten the header to fix the header.

[0008] Furthermore, in the aforementioned combined system integrated heat exchange device, the tube end sealing structure includes: a jacket tube and a tube sheet cover, the jacket tube is fixedly sleeved on the radial heat pipe end, the tube sheet cover is sleeved on the outside of the jacket tube, one end of the tube sheet cover is welded and sealed with the jacket tube, and the other end covers the corresponding side plate through hole and is welded and sealed with the corresponding side plate.

[0009] Furthermore, the aforementioned combined system integrated heat exchange device, wherein: the bottom support assembly includes: a base and a sliding support, a plurality of mounting grooves are arranged on the top of the base, a plurality of legs are arranged on the bottom of the sliding support, a wear-resistant slide plate is installed at the bottom of each leg, the legs of the sliding support correspond one-to-one to the mounting grooves of the base, the caliber of the legs of the sliding support is smaller than the caliber of the corresponding mounting grooves, and the sliding support is supported on the base by inserting its legs into the corresponding mounting grooves.

[0010] Furthermore, the aforementioned combined system integrated heat exchange device, wherein: a smoke temperature monitoring mechanism for detecting the smoke temperature is installed in the outlet flue of the smoke box, and the structure of the smoke temperature monitoring mechanism includes: a detection port is provided on the outlet flue, a fixed tube is butt-welded to the detection port, a lower flange is fixed to the pipe mouth of the fixed tube, a detection tube is inserted into the fixed tube, the detection tube is inserted into the outlet flue through the fixed tube, an upper flange for contacting and sealing with the lower flange is installed on the upper part of the detection tube, and a temperature detection probe connected to the control system signal is installed at the lower end of the detection tube.

[0011] Furthermore, in the aforementioned combined system integrated heat exchange device, a sewage outlet is provided at the bottom of the outlet flue, and the sewage outlet is connected to a sewage pipe.

[0012] Further, the aforementioned combined system integrated heat exchange device, wherein: insulation boxes are arranged on both sides of the serpentine tube heat exchanger and both sides of the radial heat pipe heat exchanger, each insulation box covers the corresponding end of the corresponding heat exchanger, and an inspection port is arranged on the insulation box corresponding to the radial heat pipe heat exchanger, and the edge of the inspection port protrudes from the insulation box to form a door frame, one end of the inspection door is hinged to one side of the door frame by a hinge, and the inspection door can be pressed on the door frame to close the inspection port when it rotates inward around the hinge, and a circle of sealing strip is arranged on the inner edge of the inspection door in contact with the door frame, A heat insulation film, a heat insulation board and a heat insulation sealing board are arranged on the inner side of the inspection door in sequence from the inside to the outside, an inspection door pressure rod is fixed on the outer side of the inspection door, a U-shaped bayonet is arranged at the end of the inspection door pressure rod away from the hinged end of the inspection door, and a locking screw is hingedly connected to the door frame side away from the hinged end of the inspection door through a hinge axis. When the inspection door closes the inspection port, the locking screw can be just inserted into the U-shaped bayonet of the inspection door pressure rod when it rotates outward around the hinge axis, and a clamping nut is also threadedly connected to the locking screw, which can compress the inspection door pressure rod and lock the inspection door to the door frame when the clamping nut is tightened inward.

[0013] Furthermore, in the aforementioned combined system integrated heat exchange device, the finned tubes of the serpentine tube heat exchanger are elliptical rectangular finned tubes with an elliptical tube cross section, and the major axis of the elliptical cross section of the elliptical rectangular finned tube is arranged along the flue gas flow direction.

[0014] Furthermore, in the aforementioned combined system integrated heat exchange device, the compensation element is a compensator or a double expansion joint.

[0015] Furthermore, in the aforementioned combined system integrated heat exchange device, the flue gas flow abnormality alarm system includes: a flow detector for real-time monitoring of the flue gas flow in the smoke box, and a PLC control system, the flow detector is signal-connected to the PLC control system, the flow detector feeds back the collected real-time flue gas flow data to the PLC control system in real time, the PLC control system can compare the real-time flue gas flow data fed back by the flow detector with the normal flue gas flow data of the unit, when the real-time flue gas flow data is lower than 90% of the normal flue gas flow data of the unit, the PLC control system will issue an alarm.

[0016] Through the implementation of the above technical scheme, the beneficial effects of the present invention are: (1) the two-stage design of using finned tubes as the first-level high-temperature heat exchange section and heat pipe heat exchanger as the second-level low-temperature section improves the adaptability range of flue gas temperature, improves heat exchange efficiency, and reduces processing costs; (2) the heat pipe heat exchanger is used as the heat exchanger of the low-temperature flue gas. Since the outer layer of the inner tube through which cooling water passes has an interlayer filled with heat pipe working fluid, the inner tube through which cooling water passes will not directly contact the low-temperature flue gas, thereby avoiding condensation in the heat exchanger located in the low-temperature section, thereby improving the overall service life of the equipment; (3) it has multiple vibration reduction structures such as compensators, double expansion joints, star chain vibration reduction nets, and vibration reduction support components, which greatly improves the stability and safety of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a combined system integrated heat exchange device described in the present invention.

[0018] Figure 2 for Figure 1 AA view of the body.

[0019] Figure 3 Schematic diagram of the structure of the serpentine tube heat exchanger.

[0020] Figure 4 for Figure 3 Left view of .

[0021] Figure 5 for Figure 3 Top view of the .

[0022] Figure 6It is a structural schematic diagram of the vibration reduction support assembly.

[0023] Figure 7 Schematic diagram of the structure of a radial heat pipe heat exchanger.

[0024] Figure 8 for Figure 7 Left view of .

[0025] Fig. 9 for Figure 7 Top view of the .

[0026] Fig.10 It is a structural schematic diagram of the pipe end sealing structure.

[0027] Fig.11 This is a schematic diagram of the structure of the Starlink vibration reduction network.

[0028] Fig.12 It is a schematic diagram of the structure of the pipe clamp.

[0029] Fig.13 It is a structural schematic diagram of the bottom support assembly.

[0030] Fig.14 The figure is a schematic diagram of the assembly of the support feet and the mounting slots.

[0031] Fig.15 for Fig.14 Top view of the .

[0032] Fig.16 This is a schematic diagram of the maintenance door in use when the inspection opening is closed.

[0033] Fig.17 for Fig.16 BB cross-sectional view. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0035] In the description of the present invention, it should be understood that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore should not be understood as a limitation on the present invention.

[0036] like Figure 1 , Figure 2As shown, a combined system integrated heat exchange device comprises a bottom support assembly 1, on which a smoke box 2 is supported, and an inlet and an outlet are respectively arranged at the front and rear ends of the smoke box 2; the inlet of the smoke box 2 is docked with an inlet flue 4 through a compensator 3, and the inlet flue has a double inlet, and the outlet of the smoke box 2 is docked with an outlet flue 6 through a double expansion joint 5, and a serpentine heat exchanger 7 and a radial heat pipe heat exchanger 8 are arranged in sequence along the flue gas flow direction in the smoke box 2 according to the flue temperature difference, so as to give full play to the potential of the two different heat exchangers; the compensator 3 and the double expansion joint 5 can reduce the influence of the "thermal expansion and contraction" or vibration of the smoke box during operation on the pipes connecting the inlet flue and the outlet flue, thereby improving the stability and safety of equipment operation;

[0037] like Figure 3 , Figure 4 , Figure 5 As shown, the serpentine heat exchanger 7 includes a plurality of serpentine heat exchange modules 9. In this embodiment, the serpentine heat exchanger 7 includes three serpentine heat exchange modules 9 stacked in sequence from top to bottom. In this embodiment, since the structure of each serpentine heat exchange module 9 is the same, the structure of only one of the serpentine heat exchange modules 9 is used as an example for explanation. The structure of the serpentine heat exchange module 9 includes: a serpentine heat exchange module frame 10, a serpentine tube water inlet header 11 and a serpentine tube water outlet header 12. A plurality of fin tubes 14 are supported between the left and right tube sheets 13 of the serpentine heat exchange module frame 10. During actual installation, the tube sheets 13 serve as a part of the side wall of the smoke box. The fin tubes 14 are arranged in a plurality of layers in the vertical direction. The fin tubes 14 of each layer are connected by a plurality of elbows 15 to form a plurality of independent and parallel serpentine heat exchange pipelines. A plurality of fin tubes 14 are provided below each layer of the fin tubes 14. There is a vibration reduction support assembly 16 for reducing vibration and limiting the position of the layer of finned tubes 14. The inlets of all serpentine heat exchange pipes are simultaneously connected in parallel to the serpentine tube water inlet header 11, and the outlets of all serpentine heat exchange pipes are simultaneously connected in parallel to the serpentine tube water outlet header 12. In this embodiment, the finned tubes 14 of the serpentine tube heat exchanger 7 are elliptical rectangular finned tubes with an elliptical tube cross section, and the long axis of the elliptical cross section of the elliptical rectangular finned tube is arranged along the flue gas flow direction. Since the elliptical tube is streamlined, the fluid separation point moves backward in the cross-flow airflow, thereby reducing the vortex area behind the tube. In addition, part of the boundary of the elliptical tube is thinner than that of the circular tube, which is conducive to enhancing heat transfer and reducing flow resistance. In addition, the elliptical tube has good rigidity along the flow direction and has a certain flexibility perpendicular to the flow direction. In the cross-flow airflow, the vibration amplitude is small, and the ability to resist thermal stress is strong, thereby improving the stability of the equipment.

[0038] like Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 , Fig.12As shown, the radial heat pipe heat exchanger 8 includes a plurality of radial heat pipe modules 17. In this embodiment, the radial heat pipe heat exchanger 8 includes two radial heat pipe modules 17 stacked in sequence from top to bottom. In this embodiment, since the structure of each radial heat pipe module is the same, the structure of only one radial heat pipe module is used as an example for description. The radial heat pipe module 17 includes: a heat pipe module frame 18, a heat pipe water inlet header 19 and a heat pipe water outlet header 20. A plurality of radial heat pipes 22 are supported between the left and right side plates 21 of the heat pipe module frame 18, and each radial heat pipe is placed in a water-laying manner; the structure of the radial heat pipe includes: horizontally laid The outer tube and the inner tube are arranged, the outer tube is sleeved outside the inner tube, the tube ends on both sides of the inner tube extend out of the outer tube, the sealed interlayer space formed by the inner tube and the outer tube is filled with heat pipe working medium, the tube ends on both sides of the inner tube are respectively provided with an inlet and an outlet, and the inner tube passes through cooling water and other cold media when the radial heat pipe is used; when in use, the high-temperature flue gas heats the heat pipe working medium, and the gas formed after the heat pipe working medium evaporates exchanges heat with the cold medium in the inner tube through the inner tube wall, and the condensate of the heat pipe medium is regenerated after the heat exchange, and the condensate falls to the bottom of the interlayer space under the action of gravity, and the heat of the external gas is efficiently transferred to the cold medium in the inner tube through the continuous evaporation and cooling of the heat pipe working medium;

[0039] During actual installation, the side plate 21 serves as a part of the side wall of the smoke box; a tube end sealing structure is provided between the tube end of each radial heat pipe 22 and the corresponding side plate 21; each radial heat pipe 22 is arranged into several layers in the up-down direction and several rows along the flue gas flow direction; the inner tubes of each row of radial heat pipes 22 form several independent and parallel heat pipe heat exchange pipelines through several bends 23; each layer of radial heat pipes 22 are connected and fixed together through pipe clamps 24; a star chain vibration reduction net 25 is provided on the heat pipe module frame 18; the star chain vibration reduction net 25 has mesh holes 26 corresponding to all radial heat pipes 22 respectively; the star chain vibration reduction net 25 is inserted into all radial heat pipes 22 through the mesh holes 26 to simultaneously reduce vibration and limit all radial heat pipes 22; the inlets of all heat pipe heat exchange pipelines are simultaneously connected in parallel to the heat pipe water inlet header 19, and the outlets of all heat pipe heat exchange pipelines are simultaneously connected in parallel to the heat pipe water outlet header 20;

[0040] In this embodiment, if Figure 6 As shown, the vibration reduction support assembly 16 includes: a support support plate 27, on which a plurality of positioning notches 28 are arranged at intervals, each positioning notch 28 of the support support plate 27 corresponds to each fin tube 14 of each layer of fin tubes 14 one by one, and a pair of vibration reduction limiting ears 29 for limiting the fins on the fin tube 14 placed in the positioning notch 28 are symmetrically arranged on the groove walls on both sides of each positioning notch 28, and a damping spring 30 for supporting the tube body of the fin tube 14 placed in the positioning notch 28 is arranged at the groove bottom of each positioning notch 28. The above-mentioned vibration reduction support assembly has a simple structure and is easy to install and maintain;

[0041] In this embodiment, a header fixing assembly 31 for fixing the header of the serpentine tube heat exchanger 7 is provided on the smoke box 2. In this embodiment, the structures of the header fixing assembly for fixing the serpentine tube water inlet header 11 and the header fixing assembly for fixing the serpentine tube water outlet header 12 are the same. The following only takes the structure of the header fixing assembly for fixing the serpentine tube water inlet header 11 as an example for explanation. The structure of the header fixing assembly includes: a header bracket 32 ​​fixedly mounted on the smoke box 2, and a plurality of U-shaped bolts 33. After each U-shaped bolt 33 is buckled on the outside of the serpentine tube water inlet header 11 through its U-shaped bayonet, both ends of the U-shaped bolt 33 simultaneously pass through the header bracket 32 ​​and are threadedly connected with a locking nut 34. When the locking nut 34 is tightened, the U-shaped bolt 33 can tighten the serpentine tube water inlet header 11 to fix the serpentine tube water inlet header 11. The above-mentioned header fixing assembly has a simple structure and is easy to disassemble and maintain.

[0042] In this embodiment, the tube end sealing structure includes: a sheath tube 35 and a tube sheet cover 36, wherein the sheath tube 35 is fixedly sleeved on the tube end of the radial heat pipe 22 passing through the corresponding side plate through hole 37, and the tube sheet cover 36 is sleeved on the outside of the sheath tube 35, one end of the tube sheet cover 36 is welded and sealed with the sheath tube 35, and the other end of the tube sheet cover 36 covers the corresponding side plate through hole 37 and is welded and sealed with the corresponding side plate 21, so that the gap between the tube end of the radial heat pipe 22 and the side plate through hole 37 can be effectively sealed to prevent the smoke in the smoke box from escaping from the gap between the tube end of the radial heat pipe 22 and the side plate through hole 37;

[0043] In this embodiment, if Fig.13 , Fig.14 , Fig.15 As shown, the bottom support assembly 1 includes: a base 38 and a sliding support 39, a plurality of mounting grooves 40 are arranged on the top of the base 38, a plurality of legs 41 are arranged on the bottom of the sliding support 39, a wear-resistant slide plate 42 is installed at the bottom of each leg 41, the legs 41 of the sliding support 39 correspond to the mounting grooves 40 of the base 38 one by one, the diameter of the legs 41 of the sliding support 39 is smaller than the diameter of the corresponding mounting grooves 40, the sliding support 39 is supported on the base 38 by inserting its legs 41 into the corresponding mounting grooves 40, so that when the cigarette box is fixedly installed on the sliding support 39, the cigarette box 2 has adjustment and expansion space on the base;

[0044] In this embodiment, a smoke temperature monitoring mechanism for detecting smoke temperature is installed on the outlet flue 6 of the smoke box 2, and the structure of the smoke temperature monitoring mechanism includes: a detection port is provided on the outlet flue 6, a fixed pipe 43 is butt-welded to the detection port, a lower flange 44 is fixed to the pipe mouth of the fixed pipe 43, a detection tube 45 is inserted into the fixed pipe 43, the detection tube 45 is inserted into the outlet flue 6 through the fixed pipe 43, an upper flange 46 for contacting and sealing with the lower flange 44 is installed on the upper part of the detection tube 45, and a temperature detection probe 47 connected to the control system signal is installed at the lower end of the detection tube 45, so that the detection tube can be easily taken out and installed;

[0045] In this embodiment, a sewage outlet is provided at the bottom of the outlet flue 6, and a sewage outlet is connected to a sewage pipe 48; Fig.16 , Fig.17 As shown, both sides of the serpentine heat exchanger 7 and both sides of the radial heat pipe heat exchanger 8 are provided with insulation boxes 61, each insulation box 61 covers the corresponding end of the corresponding heat exchanger, and an inspection port is provided on the insulation box corresponding to the radial heat pipe heat exchanger 8. The edge of the inspection port protrudes from the insulation box to form a door frame 49, and one end of the inspection door 50 is hinged to one side of the door frame 49 through a hinge 51. When the inspection door 50 rotates inward around the hinge 51, it can press on the door frame 49 to close the inspection port. A circle of sealing strips 52 is provided on the inner edge of the inspection door 50 in contact with the door frame 49, and a heat insulation film 53, a heat insulation board 54 and a heat insulation seal are sequentially provided on the inner side of the inspection door 50 from the inside to the outside. Plate 55, an inspection door pressure rod 56 is fixed on the outside of the inspection door 50, a U-shaped bayonet 57 is provided at the end of the inspection door pressure rod 56 away from the hinged end of the inspection door, and a locking screw 59 is hingedly connected to the door frame 49 side away from the hinged end of the inspection door through a hinge shaft 58. When the inspection door 50 closes the inspection port, the locking screw 59 rotates outward around the hinge shaft 58 to just fit into the U-shaped bayonet 57 of the inspection door pressure rod 56. A compression nut 60 is also threadedly connected to the locking screw 59. When the compression nut 60 is tightened inwardly, the inspection door pressure rod 56 can be compressed to lock the inspection door 50 to the door frame 49. The above-mentioned inspection door structure has good thermal insulation performance, is convenient for locking and opening, and is easy to operate and use;

[0046] In this embodiment, a flue gas flow abnormality alarm system 62 is arranged on the smoke box between the serpentine tube heat exchanger and the radial heat pipe heat exchanger; the flue gas flow abnormality alarm system 62 includes: a flow detector for real-time monitoring of the flue gas flow in the smoke box, and a PLC control system, the flow detector is connected to the PLC control system by signal, the flow detector feeds back the collected real-time flue gas flow data to the PLC control system in real time, the PLC control system can compare the real-time flue gas flow data fed back by the flow detector with the normal flue gas flow data of the unit, when the real-time flue gas flow data is lower than 90% of the normal flue gas flow data of the unit, the PLC control system will issue an alarm; taking a 200,000-kilowatt unit as an example, the normal flue gas flow of the unit is 220,000 Nm³ / h, when the real-time flue gas flow data is lower than 19.8Nm³ / h, the PLC control system will issue an alarm, indicating that there is a blockage in the smoke box, so as to remind the staff to clean it in time and improve the stability of equipment use.

[0047] The advantages of the present invention are: (1) the two-stage design uses finned tubes as the first-level high-temperature heat exchange section and the heat pipe heat exchanger as the second-level low-temperature section, which improves the adaptability range of flue gas temperature, improves the heat exchange efficiency, and reduces the processing cost; (2) the heat pipe heat exchanger is used as the heat exchanger of the low-temperature flue gas. Since the outer surface of the inner tube through which cooling water passes has an interlayer filled with heat pipe working fluid, the inner tube through which cooling water passes will not directly contact the low-temperature flue gas, thereby avoiding condensation in the heat exchanger located in the low-temperature section, thereby improving the overall service life of the equipment; (3) it has multiple vibration reduction structures such as compensators, double expansion joints, star chain vibration reduction nets, and vibration reduction support components, which greatly improves the stability and safety of the equipment.

[0048] The above description is only a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any modification or equivalent change made based on the technical essence of the present invention still falls within the scope of protection required by the present invention.

Claims

1. A combined system integrated heat exchange device, Features: It includes a bottom support assembly, a smoke box is supported on the bottom support assembly, an inlet and an outlet are respectively arranged at the front and rear ends of the smoke box; the inlet of the smoke box is connected to the inlet flue through a compensation element, and the outlet of the smoke box is connected to the outlet flue through a compensation element, and a serpentine heat exchanger and a radial heat pipe heat exchanger are arranged in sequence in the smoke box along the direction of the smoke flow; The serpentine heat exchanger comprises a plurality of serpentine heat exchange modules, each of which comprises: a serpentine heat exchange module frame, a serpentine water inlet header and a serpentine water outlet header. A plurality of finned tubes are supported between the left and right tube sheets of the serpentine heat exchange module frame. The finned tubes are arranged in a plurality of layers in the vertical direction. The finned tubes of each layer are connected by a plurality of elbows to form a plurality of independent parallel serpentine heat exchange pipelines. A vibration reduction support assembly for vibration reduction and position limiting of the finned tubes of the layer is provided below each layer of finned tubes. The inlets of all serpentine heat exchange pipelines are connected in parallel at the same time. The serpentine tube water inlet header is connected, and the outlets of all serpentine heat exchange tubes are simultaneously connected in parallel to the serpentine tube water outlet header; the vibration reduction support assembly comprises: a support support plate, on which a plurality of positioning notches are arranged at intervals, each positioning notch of the support support plate corresponds to each fin tube of each layer of fin tubes, and a pair of vibration reduction limiting ears for limiting the fins on the fin tubes placed in the positioning notches are symmetrically arranged on the groove walls on both sides of each positioning notch, and a damping spring for supporting the tube body of the fin tube placed in the positioning notch is arranged at the groove bottom of each positioning notch; The radial heat pipe heat exchanger comprises a plurality of radial heat pipe modules, each of which comprises: a heat pipe module frame, a heat pipe water inlet header and a heat pipe water outlet header, a plurality of horizontal radial heat pipes are supported between the left and right side plates of the heat pipe module frame, a pipe end sealing structure is provided between the pipe end of each radial heat pipe and the corresponding side plate, the radial heat pipes are arranged into a plurality of layers in the vertical direction and into a plurality of rows along the direction of flue gas flow, the inner pipes of each row of radial heat pipes form a plurality of independent and parallel heat pipe heat exchange pipelines through a plurality of bent pipes, and each layer of radial heat pipes is provided with a plurality of pipes. The tubes are connected and fixed together by tube clamps, and a star chain vibration reduction net is arranged on the heat pipe module frame, and the star chain vibration reduction net has mesh holes corresponding to all radial heat pipes respectively, and the star chain vibration reduction net is inserted into all radial heat pipes through the mesh holes to simultaneously reduce vibration and limit all radial heat pipes; the inlets of all heat pipe heat exchange pipelines are simultaneously connected in parallel to the heat pipe water inlet header, and the outlets of all heat pipe heat exchange pipelines are simultaneously connected in parallel to the heat pipe water outlet header; a smoke flow abnormality alarm system is arranged on the smoke box between the serpentine heat exchanger and the radial heat pipe heat exchanger; The tube end sealing structure includes: a jacket tube and a tube sheet cover, wherein the jacket tube is fixedly sleeved on the radial heat pipe end, the tube sheet cover is sleeved on the outside of the jacket tube, one end of the tube sheet cover is welded and sealed with the jacket tube, and the other end covers the corresponding side plate through hole and is welded and sealed with the corresponding side plate; The bottom support assembly includes: a base and a sliding support, a plurality of mounting grooves are arranged on the top of the base, a plurality of legs are arranged on the bottom of the sliding support, a wear-resistant slide plate is installed at the bottom of each leg, the legs of the sliding support correspond to the mounting grooves of the base one by one, the diameter of the legs of the sliding support is smaller than the diameter of the corresponding mounting grooves, and the sliding support is supported on the base by inserting its legs into the corresponding mounting grooves; The finned tube of the serpentine tube heat exchanger is an elliptical rectangular finned tube with an elliptical tube cross section, and the long axis of the elliptical cross section of the elliptical rectangular finned tube is arranged along the flue gas flow direction; the elliptical tube is streamlined, and in the cross-flow, the fluid separation point moves backward to reduce the vortex area behind the tube. The part of the boundary of the elliptical tube is thinner than that of the circular tube, which is conducive to enhancing heat transfer and reducing flow resistance; A header fixing assembly is provided on the smoke box for fixing the header of the serpentine tube heat exchanger. The structure of the header fixing assembly includes: a header bracket fixedly installed on the smoke box, and a plurality of U-shaped bolts. After each U-shaped bolt is buckled on the outside of the header through its U-shaped bayonet, both ends of the U-shaped bolt simultaneously pass through the header bracket and are threadedly connected with a locking nut. When the locking nut is tightened, the U-shaped bolt can tighten the header to fix the header. A smoke temperature monitoring mechanism for detecting smoke temperature is installed at the outlet flue of the smoke box, and the structure of the smoke temperature monitoring mechanism includes: a detection port is arranged on the outlet flue, a fixed pipe is butt-welded to the detection port, a lower flange is fixed to the pipe mouth of the fixed pipe, a detection tube is inserted into the fixed pipe, the detection tube is inserted into the outlet flue through the fixed pipe, an upper flange for contacting and sealing with the lower flange is installed on the upper part of the detection tube, and a temperature detection probe connected to the control system signal is installed at the lower end of the detection tube; a sewage outlet is arranged at the bottom of the outlet flue, and the sewage outlet is connected to the sewage outlet pipe; Insulation boxes are provided on both sides of the serpentine tube heat exchanger and both sides of the radial heat pipe heat exchanger. Each insulation box covers the corresponding end of the corresponding heat exchanger. An inspection port is provided on the insulation box corresponding to the radial heat pipe heat exchanger. The edge of the inspection port protrudes from the insulation box to form a door frame. One end of the inspection door is hinged to one side of the door frame through a hinge. When the inspection door rotates inward around the hinge, it can press on the door frame to close the inspection port. A circle of sealing strips is provided on the inner edge of the inspection door in contact with the door frame. Insulation films are provided on the inner side of the inspection door from the inside to the outside. , insulation board and insulation sealing board, an inspection door pressure rod is fixed on the outside of the inspection door, a U-shaped bayonet is arranged at the end of the inspection door pressure rod away from the hinged end of the inspection door, a locking screw is hingedly connected to the door frame side away from the hinged end of the inspection door through a hinge axis, when the inspection door closes the inspection port, the locking screw can be just inserted into the U-shaped bayonet of the inspection door pressure rod when it rotates outward around the hinge axis, and a compression nut is also threadedly connected to the locking screw, and when the compression nut is tightened inwardly, the inspection door pressure rod can be compressed to lock the inspection door to the door frame; the compensation element is a compensator or a double expansion joint; The abnormal smoke flow alarm system includes: a flow detector for real-time monitoring of the smoke flow in the smoke box, and a PLC control system. The flow detector is connected to the PLC control system by signal. The flow detector feeds back the collected real-time smoke flow data to the PLC control system in real time. The PLC control system can compare the real-time smoke flow data fed back by the flow detector with the normal smoke flow data of the unit's flue. When the real-time smoke flow data is lower than 90% of the normal smoke flow data of the unit's flue, the PLC control system will issue an alarm.

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