Radial heat pipe economizer

Abstract

The present invention discloses a radial heat pipe economizer, which includes a radial heat pipe heat exchanger supported in a support frame. The radial heat pipe heat exchanger includes: each radial heat exchange module is sequentially arranged and assembled to form a flue with a smoke inlet and a smoke outlet, a smoke inlet horn is provided at the smoke inlet, and a smoke outlet horn is provided at the smoke outlet; the radial heat exchange module includes: a number of horizontally arranged radial heat pipes are supported between the left and right side plates of the box body; the structure of the radial heat pipe includes: an inner pipe is inserted into an outer pipe, both pipe ends of the outer pipe are respectively sealed and connected to the outer wall of the inner pipe through end caps, a heat transfer working medium is filled in the annular gap, and spiral fins are installed on the outer wall of the outer pipe; each radial heat pipe is neatly arranged in the box body, the inner pipes of each radial heat pipe are connected through a number of elbows to form a number of heat exchange pipelines, the inlets of all heat exchange pipelines are communicated with a water inlet header, and the outlets are communicated with a water outlet header, and a flow guiding and abrasion prevention assembly is provided on the smoke-facing surface of each row of radial heat pipes. The present invention has the advantages of high operation stability.

Description

Technical Field

[0001] The present invention relates to the technical field of energy-saving equipment, and particularly to a radial heat pipe economizer. Background Art

[0002] An economizer is an important device for recovering the waste heat of a large amount of medium- and low-temperature flue gas discharged from an industrial boiler. At present, the economizers adopted are mostly finned tube economizers. The disadvantages of such finned tube economizers are as follows: A large amount of ash particles are often carried in the flue gas. Especially when solid fuel is used, a large amount of ash particles impact and cut the heating surface of the finned tubes. At the same time, when the wall temperature is lower than the flue gas dew point, sulfur dioxide and sulfur trioxide in the flue gas combine with water vapor to form weak acids or medium strong acids, thereby causing acid corrosion to the finned tubes. Wear and acid corrosion will cause the heating surface of the finned tubes of the economizer to leak prematurely, resulting in a very short service life of the finned tube economizer, even less than one month. A large amount of maintenance costs also increase the usage cost of the enterprise. Summary of the Invention

[0003] The purpose of the present invention is to provide a radial heat pipe economizer with high operating stability and long service life.

[0004] To achieve the above object, the present invention adopts the following technical solutions: a radial heat pipe economizer, comprising a radial heat pipe heat exchanger supported in a support frame, and the radial heat pipe heat exchanger includes: a plurality of radial heat exchange modules, and each radial heat exchange module is sequentially arranged and assembled to form a flue with a flue gas inlet and a flue gas outlet. A real-time flue gas flow detector for real-time detecting the flue gas flow is arranged at the flue gas inlet of the flue, and a temperature measuring instrument for real-time detecting the flue gas temperature is arranged at the flue gas outlet of the flue. The radial heat exchange module includes: a water inlet header, a water outlet header, and a box body with open fronts and rears. A plurality of horizontally arranged radial heat pipes are supported between the left and right side plates of the box body; the structure of the radial heat pipe includes: an outer pipe and an inner pipe, the inner pipe is disposed through the outer pipe, and both ends of the outer pipe are respectively hermetically connected to the outer wall of the inner pipe through end caps, so that the inner pipe, the outer pipe and each end cap jointly form an annular gap, a heat transfer working medium is filled in the annular gap, and spiral fins are installed along the length direction on the outer wall of each radial heat pipe; each radial heat pipe is neatly arranged in the box body to form a plurality of layers of heat pipe rows arranged at intervals up and down along the flue gas flow direction. The inner pipes of the radial heat pipes in each layer of heat pipe row extend out of the corresponding side plate of the box body and are connected through a plurality of elbows to form a left-right symmetric heat exchange pipeline. Each layer of heat exchange pipeline has water inlet in the middle and water outlet at both front and rear ends. The water inlet and the water outlet of the heat exchange pipeline formed by the odd-numbered layers of heat pipe rows are both located on the left side of the box body, and the water inlet and the water outlet of the heat exchange pipeline formed by the even-numbered layers of heat pipe rows are both located on the right side of the box body. The water inlets of all odd-numbered heat pipe rows are communicated with the left water inlet header, and the water outlets of all even-numbered heat pipe rows are communicated with the right water inlet header, and the left water inlet header and the right water inlet header are arranged symmetrically left and right; the front water outlets of all odd-numbered heat pipe rows are communicated with the left front water outlet header, and the front water outlets of all even-numbered heat pipe rows are communicated with the right front water outlet header, and the left front water outlet header and the right front water outlet header are arranged symmetrically left and right; the rear water outlets of all odd-numbered heat pipe rows are communicated with the left rear water outlet header, and the rear water outlets of all even-numbered heat pipe rows are communicated with the right rear water outlet header, and the left rear water outlet header and the right rear water outlet header are arranged symmetrically left and right; a water inlet assembly for automatically adjusting the water inflow is arranged on each water inlet header, a water outlet assembly for automatically adjusting the water outflow is arranged on each water outlet header, and a flow guiding and abrasion prevention assembly is arranged on the smoke-facing side of the radial heat pipes in each row of heat pipe rows. Further, for the aforementioned radial heat pipe economizer, wherein: the installation structure between the pipe end of each radial heat pipe and the corresponding side plate of the box body is specifically: an installation hole is arranged on the side plate of the box body, the diameter of the installation hole is larger than the outer diameter of the spiral fin of the radial heat pipe, and the pipe end of the radial heat pipe passes through the installation hole on the side plate and extends out of the corresponding side plate until the spiral fin of the radial heat pipe extends into the installation hole; a sleeve is sleeved outside the outer pipe of the radial heat pipe extending out of the side plate, the outer end of the sleeve is hermetically welded and fixed to the outer wall of the corresponding outer pipe, a bowl-shaped end cap is sleeved outside the sleeve, one end of the bowl-shaped end cap is welded and sealed to the outer wall of the sleeve, and the other end of the bowl-shaped end cap covers the installation hole of the corresponding side plate and is welded and sealed to the corresponding side plate.

[0005] Furthermore, for the aforementioned radial heat pipe economizer, wherein: a filling port is provided on the outer wall of the outer tube of the radial heat pipe, and a filling mechanism is provided at the filling port. The filling mechanism can allow the working medium to enter the annular gap during filling and does not allow the working medium in the annular gap to escape from the filling port after filling. The structure of the filling mechanism includes: a filling body, which is provided with an inlet and an outlet. A sealing cover capable of opening or closing the inlet is provided at the inlet of the filling body. The outlet of the filling body is butt-connected and communicated with the filling port on the outer wall of the outer tube of the radial heat pipe. A filling channel connecting the inlet and the outlet is provided inside the filling body. A sealing surface is provided inside the filling channel. An installation opening is formed on the side wall of the filling body facing the sealing surface. A number of guide columns extending from the installation opening to the sealing surface are provided in the filling channel between the installation opening and the sealing surface. Each guide column forms a guide channel. A sealing plate is slidably arranged in the guide channel. A cover plate for closing the installation opening is detachably installed at the installation opening. A spring seat is fixed on the side wall of the cover plate located in the filling channel. A spring is connected between the spring seat and the sealing plate. One end of the spring abuts against the spring seat and the other end abuts against the sealing plate. Under the elastic force of the spring, the sealing plate always has a tendency to tightly press against the sealing surface along the guide column against the filling direction to cut off the filling channel.

[0006] Furthermore, for the aforementioned radial heat pipe economizer, wherein: the specific installation structure of the radial heat pipe heat exchanger on the support frame is as follows: a number of cross beams are respectively fixed on the left and right sides of the radial heat pipe heat exchanger. Sliding supports are respectively fixed at the bottom ends of each cross beam. A number of limiting grooves are provided on the support frame. The limiting grooves of the support frame correspond to the sliding supports of each cross beam one by one. The diameter of each sliding support is smaller than the diameter of the corresponding limiting groove. The radial heat pipe heat exchanger is supported on the support frame by supporting the sliding supports at both ends of each cross beam in the corresponding limiting grooves.

[0007] Furthermore, for the aforementioned radial heat pipe economizer, wherein: the cross beam includes a number of support beams arranged in sequence, and adjacent support beams are connected and fixed through expansion joints.

[0008] Furthermore, for the aforementioned radial heat pipe economizer, wherein: the structure of the flow guiding and abrasion prevention assembly includes: a number of abrasion prevention and flow guiding pipes arranged in front of the smoke-facing surface of each row of radial heat pipes. Each abrasion prevention and flow guiding pipe is arranged in sequence along the flue gas flow direction. A flow dividing piece is fixedly installed on the smoke-facing surface of the first abrasion prevention and flow guiding pipe along the flue gas flow direction.

[0009] Furthermore, for the aforementioned radial heat pipe economizer, wherein: adjacent two abrasion prevention and flow guiding pipes are connected and fixed through U-shaped fixing ears and fixing rods.

[0010] Furthermore, for the aforementioned radial heat pipe economizer, it is as follows: The structure of the water inlet assembly includes: several water inlets are installed on the water inlet header, each water inlet is connected to two parallel water inlet bypass pipes, a water inlet regulating valve is installed on each water inlet bypass pipe, and each water inlet bypass is connected to the water inlet main pipe; The structure of the water outlet assembly includes: several water outlets are installed on the water outlet header, each water outlet is connected to two parallel water outlet bypass pipes, a water outlet regulating valve is installed on each water outlet bypass pipe, and each water outlet bypass is connected to the water outlet main pipe.

[0011] By implementing the above technical solutions, the beneficial effects of the present invention are: (1) Each layer of heat pipe rows in the heat exchange module adopts the method of water inlet in the middle and water outlet on both sides, reducing the flow distance and time of the refrigerant in the heat medium, making the heat pipe operate more efficiently and stably; (2) The water inlet header and water outlet header of the odd-layer heat pipe rows in the heat exchange module and the water inlet header and water outlet header of the even-layer heat pipe rows are arranged symmetrically left and right. At the same time, since each layer of heat pipe rows adopts the method of water inlet in the middle and water outlet on both sides, the flow direction of the heat exchange refrigerant in the odd-layer heat pipe rows in the radial heat exchange module is opposite to that in the even-layer heat pipe rows, thus greatly reducing the probability of resonance in the radial heat pipe heat exchanger and making the overall operation of the equipment more stable; (3) Through the design of the flow guiding and anti-wear assembly, the smoke-facing surface of the radial heat pipe is effectively protected, making the equipment more wear-resistant; (4) The horizontally arranged radial heat pipes make the equipment more resistant to low-temperature corrosion, the structure is more compact, the installation is more convenient, and when the finned outer pipe of a single radial heat pipe is damaged, the whole heat pipe heat exchanger can still operate normally, with higher operation stability and use safety; (5) The filling and maintenance are convenient; (6) The structure of installing the radial heat pipes in the box body is designed, which can not only effectively seal the gap between the pipe ends of the radial heat pipes and the corresponding side plates, but also effectively protect the pipe body of the radial heat pipes, extend the service life of the radial heat pipes and the whole equipment, and improve the use stability and use safety of the equipment; (7) Through the intelligent hydrophobic system composed of each water inlet assembly and water outlet assembly and other hydrophobic components, as well as the real-time flue gas flow detector and temperature detector, it can automatically adjust and increase or decrease the refrigerant flow through the inner pipes of each radial heat exchange module according to the flue gas flow at the flue inlet and the flue gas temperature at the flue outlet in the actual operation conditions, ensuring that the flue gas temperature discharged from the flue outlet is 90 °C, not only ensuring the stable operation of the equipment itself, but also providing flue gas at the optimal temperature for the subsequent electric dust removal, ensuring the efficient, stable and smooth operation of the subsequent low-temperature and low-temperature electric dust removal system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic structural diagram of the radial heat pipe economizer described in the present invention when the support frame is hidden.

[0013] Figure 2 is Figure 1 A schematic structural diagram when part of the side plates are hidden and the support frame is not hidden in the left view direction.

[0014] Figure 3 It is Figure 2 an enlarged schematic view of part C shown in the figure.

[0015] Figure 4 It is Figure 1 a schematic view of the connection relationship of each radial heat pipe, elbow, right water inlet header, right front water outlet header and right rear water outlet header in the even-layer heat pipe tube row in the top view direction.

[0016] Figure 5 It is Figure 1 a schematic view of the connection relationship of each radial heat pipe, elbow, left water inlet header, left front water outlet header and left rear water outlet header in the odd-layer heat pipe tube row in the top view direction.

[0017] Figure 6 It is a schematic view of the connection relationship of the right rear water outlet header, the water outlet assembly and the water outlet main pipe.

[0018] Figure 7 It is a schematic view of the connection relationship of the right water inlet header, the water inlet assembly and the water inlet main pipe.

[0019] Figure 8 It is a schematic view of the installation structure between the end of the radial heat pipe and the side plate of the corresponding box body.

[0020] Figure 9 It is Figure 8 a schematic view of the structure of the helical fin shown in the left view direction.

[0021] Figure 10 It is a schematic view of the structure of the drainage and abrasion prevention assembly.

[0022] Figure 11 It is a schematic view of the structure of the radial heat pipe when the heat transfer working medium is hidden.

[0023] Figure 12 It is a schematic view of the working principle of the radial heat pipe.

[0024] Figure 13 It is a schematic view of the structure of the filling mechanism. Specific embodiments

[0025] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is 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 orientation, as well as a specific orientation structure and operation. Therefore, it should not be construed as a limitation to the present invention. In the present invention, the Figure 1 left side of the paper surface in the figure is defined as the direction "left", and the Figure 1 right side of the paper surface in the figure is defined as the direction "right", the Figure 1 upper side of the paper surface in the figure is defined as the direction "upper", the Figure 1 lower side of the paper surface in the figure is defined as the direction "lower", the Figure 2 left side of the paper surface in the figure is defined as the direction "front", and the Figure 2 right side of the paper surface in the figure is defined as the direction "rear";

[0027] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 shown, the radial heat pipe economizer includes a radial heat pipe heat exchanger supported in a support frame 1. The radial heat pipe heat exchanger includes: a plurality of radial heat exchange modules 2. Each radial heat exchange module 2 is sequentially arranged and assembled to form a flue with a flue gas inlet and a flue gas outlet. A flue gas inlet horn 3 is provided at the flue gas inlet of the flue, and a real-time flue gas flow detector 26 for real-time detecting the flue gas flow is provided on the flue gas inlet horn 3. A flue gas outlet horn 4 is provided at the flue gas outlet of the flue, and a temperature measuring instrument 27 for real-time detecting the flue gas temperature is provided on the flue gas outlet horn 4. The radial heat exchange module 2 includes: a water inlet header 5, a water outlet header 6, and a box body with open front and rear ends. A plurality of horizontally arranged radial heat pipes 8 are supported between the left and right side plates 7 of the box body; As Figure 9 , Figure 11 , Figure 12As shown, the structure of the radial heat pipe 8 includes: a coaxial outer pipe 81 and an inner pipe 82. The inner pipe 82 is disposed inside the outer pipe 81. The two ends of the outer pipe 81 are respectively sealed and connected to the outer wall of the inner pipe 82 through covers 83, so that the inner pipe 82, the outer pipe 81 and each cover 83 together form an annular gap 84. A heat exchange working medium 85 is filled in the annular gap 84, and the heat exchange working medium is water. On the outer wall of the outer pipe 81 of each radial heat pipe 8, spiral fins 86 are installed along its length direction, and the threaded fins 86 are prepared from toothed belts. Each radial heat pipe 8 is neatly arranged in the box body along the flue gas flow direction to form several layers of heat pipe rows arranged at intervals up and down along the flue gas flow direction. The inner pipes 82 of each radial heat pipe 8 in each layer of heat pipe row extend out of the corresponding side plate 7 of the box body and are connected through several elbows 87 to form a left-right symmetric heat exchange pipeline. Each layer of heat exchange pipeline has water inlet in the middle and water outlet at both front and rear ends. The water inlet and outlet of the heat exchange pipeline formed by the odd-numbered layer heat pipe rows are both located on the left side of the box body, and the water inlet and outlet of the heat exchange pipeline formed by the even-numbered layer heat pipe rows are both located on the right side of the box body. The water inlets of all odd-numbered heat exchange pipe rows are communicated with the left water inlet header 51, and the water outlets of all even-numbered heat exchange pipe rows are communicated with the right water inlet header 52, and the left water inlet header 51 and the right water inlet header 52 are arranged symmetrically left and right; the front water outlets of all odd-numbered heat exchange pipe rows are communicated with the left front water outlet header 61, and the front water outlets of all even-numbered heat exchange pipe rows are communicated with the right front water outlet header 62, and the left front water outlet header 61 and the right front water outlet header 62 are arranged symmetrically left and right; the rear water outlets of all odd-numbered heat exchange pipe rows are communicated with the left rear water outlet header 63, and the rear water outlets of all even-numbered heat exchange pipe rows are communicated with the right rear water outlet header 64, and the left rear water outlet header 63 and the right rear water outlet header 64 are arranged symmetrically left and right; because the water inlet headers and water outlet headers of the odd-numbered layer heat pipe rows and the water inlet headers and water outlet headers of the even-numbered layer heat pipe rows are arranged symmetrically left and right, and at the same time, because each layer of heat pipe row adopts the way of water inlet in the middle and water outlet at both sides, the flow direction of the heat exchange refrigerant in the odd-numbered layer heat pipe rows in the radial heat exchange module and the flow direction of the heat exchange refrigerant in the even-numbered layer heat pipe rows are opposite flows, thus greatly reducing the probability of resonance and making the overall operation of the equipment more stable;

[0028] Water inlet assemblies for automatically adjusting the water inflow are provided on both the left water inlet header 51 and the right water inlet header 52, and water outlet assemblies for automatically adjusting the water outflow are provided on the left front water outlet header 61, the left rear water outlet header 63, the right front water outlet header 62 and the right rear water outlet header 64. In this embodiment, since the structures of the water inlet assemblies on each water inlet header are the same, only the structure of the water inlet assembly on the right water inlet header 52 will be taken as an example for illustration, as Figure 7As shown in the figure, the structure of the water inlet assembly includes: several water inlets 18 are installed on the water inlet header 5, and two parallel water inlet bypass pipes 19 are connected to each water inlet 18. A water inlet regulating valve 20 is installed on each water inlet bypass pipe 19, and each water inlet bypass 19 is connected to the water inlet main pipe 21. In this embodiment, since the structures of the water outlet assemblies on each water outlet header are the same, only the structure of the water outlet assembly on the right rear water outlet header 64 will be taken as an example for illustration, as Figure 6 shown, the structure of the water outlet assembly includes: several water outlets 22 are installed on the water outlet header 6, and two parallel water outlet bypass pipes 23 are connected to each water outlet 22. A water outlet regulating valve 24 is installed on each water outlet bypass pipe 23, and each water outlet bypass pipe 23 is connected to the water outlet main pipe 25. In actual application, each water inlet regulating valve 20, each water outlet regulating valve 24, the real-time flue gas flow detector 26 and the temperature measuring instrument 27 are all electrically connected to the PLC control system. The PLC control system can adjust the opening degrees of each water inlet regulating valve 20 and each water outlet regulating valve 24 in real time according to the flue gas flow at the flue inlet and the flue gas temperature at the flue outlet in the actual operating conditions, so as to synchronously adjust and increase or decrease the refrigerant flow rate through the inner pipes of each radial heat exchange module, ensure that the flue gas discharged from the flue outlet is at 90 °C, thereby providing effective and reasonable flue gas for the subsequent electric dust removal and ensuring the stable operation of the subsequent electric dust removal system;

[0029] A diversion and abrasion prevention assembly 9 is arranged on the smoke-facing side of the radial heat pipes 8 in each row of heat pipe tube rows; in this embodiment, as Figure 10 shown, the structure of the diversion and abrasion prevention assembly 9 includes: several abrasion prevention and diversion pipes 91 arranged directly in front of the smoke-facing surface of each row of radial heat pipes. Each abrasion prevention and diversion pipe 91 is arranged in sequence along the flue gas flow direction. The direct erosion of the radial heat pipes by the flue gas is avoided through the abrasion prevention and diversion pipes 91, effectively protecting the radial heat pipes, thereby prolonging the service life of the radial heat pipes. A diversion plate 92 is fixedly installed on the smoke-facing surface of the first abrasion prevention and diversion pipe 91 along the flue gas flow direction. The diversion plate 92 can better divert the flue gas, which can not only change the disordered flue gas into an orderly state, but also better prevent the direct erosion of the abrasion prevention and diversion pipes 91 by the flue gas, prolonging the service life of the abrasion prevention and diversion pipes 91, and further prolonging the service life of the overall equipment; in this embodiment, adjacent two abrasion prevention and diversion pipes 91 are connected and fixed through U-shaped fixing ears 93 and fixing rods 94. During installation, first weld the fixing rods 94 on the side walls of each abrasion prevention and diversion pipe 91, and then weld the fixing rods 94 of the two abrasion prevention and diversion pipes 91 to the two connecting arms of the U-shaped fixing ear 93 respectively, thereby completing the connection of the two abrasion prevention and diversion pipes 91;

[0030] In this embodiment, as Figure 8As shown in the figure, the installation structure between the tube end of each radial heat pipe 8 and the side plate 7 of the corresponding side of the box body is specifically as follows: an installation hole 10 is provided on the side plate 7 of the box body, and the diameter of the installation hole 10 is larger than the outer diameter of the spiral fin 86 of the radial heat pipe 8. The tube end of the radial heat pipe 8 passes out of the corresponding side plate 7 from the installation hole 10 of the side plate 7 until the spiral fin 86 of the radial heat pipe 8 extends into the installation hole 10; a sleeve 11 is sleeved outside the outer tube 81 of the radial heat pipe 8 extending out of the side plate 7. The outer tube end of the sleeve 11 is fixedly welded and sealed to the outer wall of the corresponding outer tube 81. A bowl-shaped cover 12 is sleeved outside the sleeve 11. One end of the bowl-shaped cover 12 is welded and sealed to the outer wall of the sleeve 11, and the other end of the bowl-shaped cover 12 covers the installation hole 10 of the corresponding side plate 7 and is welded and sealed to the corresponding side plate 7, so as to effectively seal the gap between the tube end of the radial heat pipe and the corresponding side plate; after the above installation structure of the radial heat pipe and the corresponding side of the box body is adopted in this application, on the one hand, the diameter of the installation hole 10 of the side plate is larger than the outer diameter of the spiral fin 86 of the radial heat pipe 8. In this way, during assembly, the spiral fin of the radial heat pipe 8 can be located in the installation hole 10 of the side plate. This assembly state is as shown in Figure 8 As shown in the figure, since the spiral fin 86 of the radial heat pipe 8 is in the installation hole 10 of the side plate, when the radial heat pipe vibrates during the operation of the equipment, only the direct friction between the spiral fin 86 of the radial heat pipe and the side plate 7 will occur, and the direct friction between the tube body of the radial heat pipe and the side plate 7 will not occur, thus effectively protecting the tube body of the radial heat pipe, prolonging the service life of the radial heat pipe, and improving the use stability and safety of the equipment; on the other hand, since the diameter of the installation hole 10 of the side plate is larger than the outer diameter of the spiral fin 86 of the radial heat pipe 8, the advantages of this design are: 1) The assembly is convenient. The radial heat pipe 8 can pass through the installation hole 10 of the side plate as a whole. In this way, the overall installation process of the equipment can be designed as: passing each radial heat pipe through the installation hole 10 of the corresponding side plate 7 of the box body one by one and inserting it into the installation hole 10 of the side plate 7 on the other side of the box body. In this way, when assembling a single radial heat pipe, it is not necessary to consider the corresponding state of the remaining radial heat pipes and the side plates of the box body, and the assembly process is time-saving and labor-saving; furthermore, the shape of the cover connecting the sleeve and the side plate of the box body is designed as a bowl-shaped cover. This cover design has good welding stress diffusion during welding, strong adaptability to rapid temperature changes, will not cause welding hidden dangers, and is not easy to burst due to rapid temperature changes of the flue gas, further improving the use stability and safety of the equipment;

[0031] In this embodiment, a filling port is provided on the outer wall of the outer tube 81 of the radial heat pipe 8, and a filling mechanism 13 is provided at the filling port. The filling mechanism 13 can allow the working medium to enter the annular gap 84 during filling and does not allow the working medium in the annular gap 84 to escape from the filling port after filling, as shown in Figure 13As shown in the figure, the structure of the mesenchymal mechanism 13 includes: a mesenchymal body 131, the mesenchymal body 131 is provided with an inlet 132 and an outlet 133. A sealing cover 141 capable of opening or closing the inlet is provided at the inlet 132 of the mesenchymal body 131. The outlet 133 of the mesenchymal body 131 is butt-connected and communicated with a mesenchymal port on the outer wall of the outer tube 81 of the radial heat pipe 8. A mesenchymal channel 134 connecting the inlet 132 and the outlet 133 is arranged inside the mesenchymal body 131. A sealing surface 135 is arranged inside the mesenchymal channel 134. An installation opening is formed on the side wall of the mesenchymal body 131 facing the sealing surface 135. A number of guide columns 136 extending from the installation opening to the sealing surface 135 are arranged in the mesenchymal channel 134 between the installation opening and the sealing surface 135. Each guide column 136 forms a guide channel. A sealing plate 137 is slidably arranged in the guide channel. A cover plate 138 for closing the installation opening is detachably installed at the installation opening. A spring seat 139 is fixed on the side wall of the cover plate located in the mesenchymal channel 134. A spring 140 is connected between the spring seat 139 and the sealing plate 137. One end of the spring 140 abuts against the spring seat 139 and the other end abuts against the sealing plate 137. Under the elastic force of the spring 140, the sealing plate 137 always has a tendency to tightly press against the sealing surface 135 along the guide column 136 against the mesenchymal direction to cut off the mesenchymal channel 134; when it is necessary to fill the annular gap of the radial heat pipe 8 with a heat transfer working medium, the heat transfer working medium is filled into the mesenchymal channel 134 from the inlet 132. At this time, under the pressure action, the sealing plate 137 will leave the sealing surface 135 to open the mesenchymal channel 134, so that the heat transfer working medium can smoothly fill the annular gap 84 of the radial heat pipe 8 through the mesenchymal channel 134, the outlet 133 and the mesenchymal port; after the mesenchymal filling is completed, under the pressure action of the working medium in the annular gap of the radial heat pipe, the sealing plate 137 will re-tightly press against the sealing surface 135 along the guide column 136 against the mesenchymal direction under the elastic force of the spring 140, so as to cut off the mesenchymal channel 134 again. The above-mentioned mesenchymal mechanism has a simple structure and is convenient to use; when the radial heat pipe is overhauled and it is necessary to discharge the heat transfer working medium 85, only need to open the cover plate 138 and take out the sealing plate 137. At this time, the heat transfer working medium 85 in the annular gap 84 will be exhausted through the installation opening on the side wall of the mesenchymal body;

[0032] In this embodiment, the specific installation structure of the radial heat pipe heat exchanger on the support frame 1 is as follows: a number of cross beams 14 are respectively fixed on the left and right sides of the radial heat pipe heat exchanger. At the bottom of each end of each cross beam 14, sliding supports 15 are respectively fixed. A number of limiting grooves 16 are provided on the support frame 1. The limiting grooves 16 of the support frame 1 correspond one by one to the sliding supports 15 of each cross beam 14. The diameter of each sliding support 15 is smaller than the diameter of the corresponding limiting groove 16. The radial heat pipe heat exchanger is supported on the support frame 1 by supporting the sliding supports 15 at both ends of each cross beam 14 in the corresponding limiting grooves 16. In this way, the radial heat pipe heat exchanger can have self-adjusting and expansion space on the support frame 1, thereby improving the use stability of the equipment. In this embodiment, the cross beam 14 includes a number of support beams arranged in sequence. Adjacent support beams are connected and fixed by expansion joints 17. In this way, the radial heat pipe heat exchanger can have more self-adjusting and expansion space on the support frame 1, further improving the use stability of the equipment.

[0033] During operation, the flue gas enters the radial heat pipe heat exchanger from the inlet smoke horn 3, and is discharged from the outlet smoke horn 3 after being heat exchanged by each radial heat exchange module 2. During the process of the flue gas passing through each radial heat exchange module 2, cold water is continuously introduced into the inlet main pipe 21. The cold water in the inlet main pipe 21 then enters the inlet header 5 through the inlet bypass pipe 19 currently controlled to be opened by the PLC control system according to the operating conditions, and is then distributed from the inlet header 5 to each layer of radial heat pipes 8, so as to exchange heat with the flue gas. The heat exchange process between the flue gas and the radial heat pipe is described below: After the flue gas passes through the radial heat pipe 8, the heat in the flue gas will be first transferred to the outer pipe 81, and then transferred to the heat exchange working medium 85 in the annular gap 84. The heat exchange working medium 85 will evaporate and gasify when heated. The steam flows radially to the outer wall of the inner pipe and condenses to release heat, thereby heating the cold water flowing through the inner pipe 82 at this time. After the steam exchanges heat with the inner pipe 82 and condenses into a liquid, it then relies on gravity to flow back to the lower part of the cavity of the annular gap 84 and enters the next cycle, repeating continuously, so as to realize the heat recovery and utilization of the flue gas. In this equipment, the cold water after heat exchange is introduced into the inner pipe 82, and the heat exchange working medium is arranged in the annular gap 84 formed by the inner pipe 82 and the outer pipe 81. In this way, during the operation of the equipment, the outer pipe 81 will effectively protect the inner pipe 82. As long as the inner pipe 82 does not leak, even if the outer pipe 81 leaks, it will not affect the operation of the cold water for heat exchange, thereby greatly improving the overall service life of the equipment. The cold water is collected in the outlet header 6 after heat exchange with the flue gas, and then enters the outlet main pipe 25 through the outlet bypass pipe 23 currently controlled to be opened by the PLC control system according to the operating conditions and is discharged.

[0034] The advantages of the present invention are as follows: (1) In each layer of the heat pipe row of the heat exchange module, water is introduced from the middle and discharged from both sides, reducing the flow distance and time of the refrigerant in the heat medium and making the operation of the heat pipe more efficient and stable; (2) The water inlet header and the water outlet header of the odd-layer heat pipe rows of the heat exchange module are arranged symmetrically with the water inlet header and the water outlet header of the even-layer heat pipe rows left and right. At the same time, since water is introduced from the middle and discharged from both sides in each layer of the heat pipe row, the flow direction of the heat exchange refrigerant in the odd-layer heat pipe rows in the radial heat exchange module is opposite to that in the even-layer heat pipe rows, thus greatly reducing the probability of resonance in the radial heat pipe heat exchanger and making the overall operation of the equipment more stable; (3) Through the design of the drainage and abrasion prevention component, the smoke-facing surface of the radial heat pipe is effectively protected, making the equipment more wear-resistant; (4) By using horizontally arranged radial heat pipes, the equipment is more resistant to low-temperature corrosion, has a more compact structure, is more convenient to install, and when the finned outer tube of a single radial heat pipe is damaged, the heat pipe heat exchanger can still operate normally, with higher operation stability and use safety; (5) It is convenient for filling the medium and maintenance; (6) The structure of installing the radial heat pipe in the box body is designed, which can not only effectively seal the gap between the pipe end of the radial heat pipe and the corresponding side plate, but also effectively protect the body of the radial heat pipe, extend the service life of the radial heat pipe and the whole equipment, and improve the use stability and use safety of the equipment; (7) Through the intelligent drain system composed of each water inlet component, water outlet component and other drain components, as well as the real-time flue gas flow detector and temperature detector, the refrigerant flow rate flowing through the inner pipes of each radial heat exchange module can be automatically adjusted according to the flue gas flow rate at the inlet of the flue and the flue gas temperature at the outlet of the flue in the actual operation condition, ensuring that the flue gas temperature discharged from the outlet of the flue is 9C, which not only ensures the stable operation of the equipment itself, but also provides flue gas at the optimal temperature for the subsequent electric dust removal, ensuring the efficient, stable and smooth operation of the subsequent low-low temperature electric dust removal system.

[0035] The above are only the preferred embodiments of the present invention, and it is not limited to the present invention in any other form. Any modification or equivalent change made according to the technical essence of the present invention still falls within the scope of protection required by the present invention.

Claims

1. Radial heat pipe economizer, characterized in that: The invention comprises a radial heat pipe heat exchanger supported in a supporting frame, wherein the radial heat pipe heat exchanger comprises: a plurality of radial heat exchange modules, each radial heat exchange module is sequentially arranged and assembled to form a flue with a smoke inlet and a smoke outlet, a real-time smoke flow detector for real-time detection of smoke flow rate is provided at the smoke inlet of the flue, and a temperature meter for real-time detection of smoke temperature is provided at the smoke outlet of the flue, the radial heat exchange module comprises: a water inlet header, a water outlet header, and a box body with front and rear openings, and a plurality of horizontally arranged radial heat pipes are supported between the left and right side plates of the box body; the structure of the radial heat pipe comprises: an outer The inner tube is passed through the outer tube, and the ends of the outer tube on both sides are sealed and connected to the outer wall of the inner tube through covers, so that the inner tube, the outer tube and the covers together form an annular gap, and the annular gap is filled with heat exchange medium. Spiral fins are installed on the outer wall of the outer tube of each radial heat pipe along its length direction; the radial heat pipes are neatly arranged in the box to form several layers of heat pipe rows arranged at intervals in the direction of flue gas flow, and the inner tubes of each radial heat pipe in each layer of heat pipe row extend out of the corresponding box side plate and are connected through several elbows to form a left-right symmetrical heat exchange pipeline, and each layer of heat exchange pipeline is water-inlet from the middle and water-outlet from the front and rear ends. The water inlet and outlet of the heat exchange pipeline formed by the odd-numbered layers of heat pipe rows are both located on the left side of the box, and the water inlet and outlet of the heat exchange pipeline formed by the even-numbered layers of heat pipe rows are both located on the right side of the box. The water inlets of all odd-numbered layers of heat exchange tube rows are connected to the left water inlet header, and the water inlets of all even-numbered layers of heat exchange tube rows are connected to the right water inlet header, and the left water inlet header and the right water inlet header are arranged symmetrically on the left and right; the front water outlets of all odd-numbered layers of heat exchange tube rows are connected to the left front water outlet header, and the front water outlets of all even-numbered layers of heat exchange tube rows are connected to the right front water outlet header, and the left front water outlet header and the right front water outlet header are arranged symmetrically on the left and right; The rear water outlets of all odd-numbered heat exchange tube rows are connected to the left rear water outlet header, and the rear water outlets of all even-numbered heat exchange tube rows are connected to the right rear water outlet header, and the left rear water outlet header and the right rear water outlet header are arranged symmetrically on the left and right sides; a water inlet assembly for automatically adjusting the water inlet volume is provided on each water inlet header, and a water outlet assembly for automatically adjusting the water outlet volume is provided on each water outlet header, and a drainage and anti-wear assembly is provided on the smoke-facing side of the radial heat pipes of each row of heat pipe rows; the flow direction of the heat exchange refrigerant in the odd-numbered heat pipe rows in the radial heat exchange module is counter-flow to the flow direction of the heat exchange refrigerant in the even-numbered heat pipe rows; The mounting structure between the tube end of each radial heat pipe and the corresponding side panel of the box is specifically as follows: a mounting hole is provided on the side panel of the box, the diameter of the mounting hole is larger than the outer diameter of the spiral fin of the radial heat pipe, the tube end of the radial heat pipe passes outward from the mounting hole of the side panel and out of the corresponding side panel until the spiral fin of the radial heat pipe extends into the mounting hole; a sleeve is sheathed on the outer side of the outer tube of the radial heat pipe extending out of the side panel, the outer tube end of the sleeve is sealed and welded to the outer wall of the corresponding outer tube, and a bowl-shaped cover is sheathed on the outer side of the sleeve, one end of the bowl-shaped cover is welded and sealed to the outer wall of the sleeve, and the other end of the bowl-shaped cover covers the mounting hole of the corresponding side panel and is welded and sealed to the corresponding side panel; The structure of the water inlet assembly includes: several water inlets are installed on the water inlet header, and two parallel water inlet bypass pipes are connected to each water inlet. A water inlet regulating valve is installed on each water inlet bypass pipe, and each water inlet bypass is connected to the water inlet main pipe; The structure of the water outlet assembly includes: several water outlets are installed on the water outlet header, and two parallel water outlet bypass pipes are connected to each water outlet. A water outlet regulating valve is installed on each water outlet bypass pipe, and each water outlet bypass pipe is connected to the water outlet main pipe; Each water inlet regulating valve, each water outlet regulating valve, the real-time flue gas flow detector and the temperature measuring instrument are all electrically connected to the PLC control system. The PLC control system can adjust the opening degrees of each water inlet regulating valve and water outlet regulating valve in real time according to the flue gas flow at the flue inlet and the flue gas temperature at the flue outlet in the actual operating conditions, so as to synchronously adjust and increase or decrease the refrigerant flow through the inner pipes of each radial heat exchange module, ensuring that the flue gas temperature discharged from the flue outlet is 90 °C, thereby providing effective and reasonable flue gas for the subsequent electric dust removal.

2. The radial heat pipe economizer according to claim 1, characterized in that: A filling port is arranged on the outer wall of the outer pipe of the radial heat pipe, and a filling mechanism is arranged at the filling port. The filling mechanism can allow the working medium to enter the annular gap during filling and does not allow the working medium in the annular gap to escape from the filling port after filling. The structure of the filling mechanism includes: a filling body, the filling body is provided with an inlet and an outlet. A sealing cover capable of opening or closing the inlet is arranged at the inlet of the filling body. The outlet of the filling body is butted and communicated with the filling port on the outer wall of the outer pipe of the radial heat pipe. A filling channel connecting the inlet and the outlet is arranged inside the filling body. A sealing surface is arranged inside the filling channel. An installation opening is formed on the side wall of the filling body facing the sealing surface. Several guide columns extending from the installation opening to the sealing surface are arranged in the filling channel between the installation opening and the sealing surface. Each guide column forms a guide channel. A sealing plate is slidably arranged in the guide channel. A cover plate for closing the installation opening is detachably installed at the installation opening. A spring seat is fixed on the side wall of the cover plate located in the filling channel. A spring is connected between the spring seat and the sealing plate. One end of the spring abuts against the spring seat and the other end abuts against the sealing plate. The sealing plate always has a tendency to tightly press against the sealing surface along the guide column against the filling direction under the elastic force of the spring to cut off the filling channel.

3. The radial heat pipe economizer according to claim 1, wherein: The specific installation structure of the radial heat pipe heat exchanger on the support frame is: several cross beams are respectively fixed on the left and right sides of the radial heat pipe heat exchanger. Sliding supports are respectively fixed at the bottom ends of each cross beam. Several limiting grooves are arranged on the support frame. The limiting grooves of the support frame correspond to the sliding supports of each cross beam one by one. The diameter of each sliding support is smaller than the diameter of the corresponding limiting groove. The radial heat pipe heat exchanger is supported on the support frame by supporting the sliding supports at both ends of each cross beam in the corresponding limiting grooves.

4. The radial heat pipe economizer according to any one of claims 1 to 3, characterized in that: The cross beam includes several sequentially arranged support beams, and adjacent support beams are connected and fixed through expansion joints.

5. The radial heat pipe economizer according to any one of claims 1 to 3, characterized in that: The structure of the drainage and abrasion prevention assembly includes: several abrasion prevention and drainage pipes arranged directly in front of the smoke-facing surface of each row of radial heat pipes. Each abrasion prevention and drainage pipe is arranged in sequence along the flue gas flow direction. A shunt piece is fixedly installed on the smoke-facing surface of the first abrasion prevention and drainage pipe along the flue gas flow direction.

6. The radial heat pipe economizer according to claim 5, wherein: Two adjacent anti-abrasion drainage tubes are connected and fixed through U-shaped fixing ears and fixing rods.

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