SCR integrated water tube boiler structure and new type of convection form

Abstract

The application discloses an SCR integrated water pipe type boiler structure, which comprises a furnace body, an SCR reactor and an economizer, the smoke outlet of the furnace body is sequentially communicated with the SCR reactor and the economizer through intermediate devices, the economizer comprises a shell, heat exchange water pipes, a lower flow guide cover and an upper flow guide cover, the shell is vertically shaped as a multi-ribbed cylinder, a plurality of heat exchange water pipes are vertically arranged and the middle parts are located in the inner cavity of the shell, and the two end parts of the heat exchange water pipes are communicated with the water circulation system outside. When the application is used, since the flue gas enters the inner cavity of the shell from the lower flow guide cover, the lower flow guide seat and the flow guide hole, the flow direction of the flue gas is parallel to the axial direction of the heat exchange water pipes, so that the wind resistance and the flow disturbance can be greatly reduced, the pressure drop is reduced, the power consumption of the air blower and the induced draft fan outside is reduced, the ash deposition and the abrasion of the heat exchange water pipes are reduced, the service life of the heat exchange water pipes is prolonged, the soot blowing frequency is reduced, and the spacing between the heat exchange water pipes can be properly reduced.

Description

Technical Field

[0001] This invention relates to the field of heat energy recovery and utilization technology, and in particular to an integrated SCR water tube boiler structure and a novel convection mode. Background Technology

[0002] The exhaust gas produced during boiler combustion contains a large amount of pollutants such as nitrogen oxides. These pollutants must be treated to ensure the exhaust gas meets the corresponding emission standards before it can be released. Since the exhaust gas contains a large amount of waste heat, recovering and utilizing this waste heat is more in line with the requirements of energy conservation, environmental protection, and economic benefits. Chinese utility model patent application number CN201921914730.7 provides an integrated denitrification device combining an SCR reactor and an energy-saving device. This patent states that "the integrated denitrification device combining an SCR reactor and an energy-saving device can minimize the pressure loss during denitrification; tests have shown that the pressure loss can be less than 20 Pa. While not affecting the boiler's operation, it can also improve the boiler's energy efficiency, providing heat to the energy-saving device and improving its heat exchange efficiency." However, this patent does not describe the structure of the hot water exchange pipe, and observation from the attached drawings shows that the axis of the hot water exchange pipe is perpendicular to the flow direction of the exhaust gas. This leads to the following problems: First, the exhaust gas experiences significant turbulence and wind resistance when flowing through the hot water exchange pipe, resulting in a large pressure drop. First, it requires a high-powered blower or induced draft fan for assistance, resulting in high energy consumption. Second, due to the presence of turbulence, dust particles in the flue gas will aggravate the impact on the back of the hot water exchange pipes, and are also prone to ash accumulation, thereby increasing the wear of the hot water exchange pipes, reducing heat exchange efficiency and service life, and indirectly increasing the frequency of soot blowing, making it inconvenient to use. Third, due to the presence of turbulence and the relatively high wind resistance, in order to ensure smooth flow of exhaust gas, the spacing between the hot water exchange pipes needs to be increased, thereby reducing space utilization and indirectly increasing the space occupied. Fourth, due to the presence of turbulence and the relatively high wind resistance, its reliability is reduced, and it is easy to cause uneven heating on the windward and leeward sides of the hot water exchange pipes, thereby increasing thermal stress and further reducing reliability and safety. Summary of the Invention

[0003] The purpose of this invention is to provide an integrated SCR water tube boiler structure and a novel convection method to solve the above-mentioned technical problems.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An integrated SCR water tube boiler structure includes a boiler body, an SCR reactor, and an economizer. The flue gas outlet of the boiler body is connected to the SCR reactor and the economizer in sequence through an intermediate device. The economizer includes a shell, hot water exchange pipes, a lower guide shroud, and an upper guide shroud. The shell is a vertically shaped multi-faceted cylinder. Multiple hot water exchange pipes are vertically arranged and located in the inner cavity of the shell. The two ends of the hot water exchange pipes are connected to an external water circulation system. The lower guide shroud is rigidly connected to the bottom of the shell, and the upper guide shroud is rigidly connected to the top.

[0006] Based on the above technical solution, the hot water exchange pipe is a vertical cylindrical shape, with the top axially sealed and the bottom axially penetrating. The upper and lower parts of the hot water exchange pipe are each radially fixedly connected with a connecting nozzle. The hot water exchange pipe is connected to the external water circulation system through the connecting nozzles at the upper and lower parts. The lower part of the hot water exchange pipe is rigidly connected with a valve for controlling the on / off state. The valve is located below the connecting nozzle at the lower part of the hot water exchange pipe.

[0007] Based on the above technical solution, the upper flow guide seat and the upper flow guide shroud are detachably and rigidly connected to the upper part of the outer shell via flanges and fasteners, and the lower flow guide seat and the lower flow guide shroud are detachably and rigidly connected to the lower part of the outer shell via flanges and fasteners. The upper flow guide shroud is in the shape of an inverted frustum-shaped funnel, and the lower flow guide shroud is in the shape of a frustum-shaped funnel. The upper and lower flow guide seats are respectively provided with multiple circular flow guide holes running through them vertically. The upper and lower flow guide shrouds are respectively connected to the inner cavity of the outer shell through the flow guide holes, and each of the flow guide holes is coaxially and intermittently inserted into the hot water exchange pipe.

[0008] Based on the above technical solution, the bottom of the lower guide seat is flat and converges towards the upper middle part, the bottom of the upper guide seat is flat and converges towards the upper middle part, the upper guide seat has an upper drain port running through its four sides, and the lower guide seat has a lower drain port running through its four sides, the upper guide seat is equipped with an upper opening and closing mechanism, and the lower guide seat is equipped with a lower opening and closing mechanism. The upper opening and closing mechanism is used to control whether the upper drain port is connected to the inner cavity of the outer shell and the inner cavity of the upper guide cover, and the lower opening and closing mechanism is used to control whether the lower drain port is connected to the inner cavity of the outer shell and the inner cavity of the lower guide cover. Multiple vertical guide cylinders are fixed on the upper part of the lower guide seat, and each guide cylinder corresponds vertically to each guide hole and is coaxially and intermittently inserted into the outside of the hot water pipe.

[0009] Based on the above technical solution, the upper opening and closing mechanism includes a valve plate, a valve port, a support plate, a support groove, a crankshaft, a support base, and a servo motor. Each upper drain port is slidably connected to a vertical valve plate, each valve plate has a valve port horizontally extending through it, and each valve plate has a vertical support plate fixed to its top. Each support plate has a horizontal support groove extending through it. A crankshaft is installed on each of the four sides of the upper guide seat. The main shaft of the crankshaft is horizontally rotatably connected to the upper guide seat. The connecting rod shaft of the crankshaft is slidably connected to the support groove, allowing it to slide and rotate horizontally within the support groove. The upper guide shroud is rigidly connected to... Multiple support bases are provided, each of which is rigidly connected to a servo motor with braking function. The rotating shaft of the servo motor is connected to the main shaft of the crankshaft through gear transmission. The servo motor is electrically connected to an external electrical control system and power supply. When the servo motor rotates, it can drive the crankshaft to rotate through gear transmission. When the crankshaft rotates, it can move the support plate and valve plate up and down by cooperating with the support groove. When the valve plate moves up and down to a certain position, it can make the valve port simultaneously connect with the inner cavity of the upper guide shroud, the upper drain port and the inner cavity of the outer shell. When the valve plate moves up and down to a certain position, it can make the valve plate completely block the upper drain port.

[0010] Based on the above technical solution, the lower opening and closing mechanism includes an inner lifting frame, receiving holes, counterweight plates, threading holes, an upper protective cover, fixed pulleys, an outer lifting frame, and a lower protective cover. The inner lifting frame is slidably connected vertically within the outer shell. The inner lifting frame has multiple receiving holes extending vertically, each capable of being inserted into the outside of the guide tube. Multiple vertical counterweight plates are fixed to the bottom of the inner lifting frame. Each counterweight plate can be inserted vertically into the lower drain outlet to achieve complete sealing, and can also be disengaged from the lower drain outlet to allow communication between the lower drain outlet and the inner cavity of the outer shell and the inner cavity of the lower guide cover. The upper part of the outer shell has multiple horizontal threading holes connecting to the outside, and multiple upper protective covers are fixed to the upper outer wall. Each upper protective cover is rotatably connected to... A fixed pulley, the virtual axis of which is horizontally arranged, and each of the upper protective covers is respectively connected to the wire-passing hole and is symmetrically arranged with respect to the outer shell in the horizontal direction. An outer lifting frame is slidably connected to the outer shell. The outer lifting frame is fixed with multiple lower protective covers and is located below the lower protective covers. When each of the lower protective covers slides up and down, it can insert and disengage with the upper protective cover to realize the on / off control of the connection between the wire-passing hole and the outside world. The inner lifting frame and the outer lifting frame are connected by a high-temperature resistant flexible cable. The flexible cable is guided by the wire-passing hole and the upper part of the fixed pulley to achieve steering. Under the gravity of its own weight and the counterweight plate, the inner lifting frame always has a downward tendency to move, which can drive the outer lifting frame to move upward.

[0011] Based on the above technical solution, each of the aforementioned receiving holes has a support ring that rotates coaxially. The support ring is interlocked with the hot water pipe and the guide tube, and its inner circumference is horizontally fixed with elastic, high-temperature resistant bristles. A driven external gear ring is coaxially fixed outside each support ring. The driven external gear ring is located within the inner lifting frame, and adjacent driven external gear rings mesh with each other. The inner lifting frame is equipped with a rotary drive mechanism, which includes a guide shaft, a guide groove, an upper bushing, and a driving external gear ring. The upper guide seat and lower guide... The flow base is equipped with a guide shaft that can maintain relative stillness. The guide shaft is vertically arranged and has a spiral guide groove coaxially formed on its outer circumferential wall. An upper bushing is slidably connected to the guide shaft. The upper bushing is in close contact with the outer circumferential wall of the guide shaft and the guide groove. An active external gear ring is fixed coaxially to the outer side of the upper bushing relative to the guide shaft. When the upper bushing moves up and down along the guide shaft, it can achieve forward and reverse rotation by cooperating with the guide groove. The active external gear ring meshes with at least one driven external gear ring.

[0012] Based on the above technical solution, the rotary drive mechanism further includes ventilation holes, guide cones, anti-slip textures, turbofan blades, a lower bushing, and a lifting mechanism. The guide shaft is located in the middle of the upper and lower guide seats. A ventilation hole runs vertically through the middle of the upper guide seat, with a larger diameter at the top and a smaller diameter at the bottom, transitioning from the top to the bottom in a funnel shape. A guide cone is coaxially fixed to the top of the guide shaft. The bottom of the guide cone is conical with a downward protrusion, and the upper part is cylindrical. Anti-slip textures are provided on the conical surface at the bottom of the guide cone. The guide shaft is coaxially and interlocked within the ventilation hole. Multiple turbofan blades are fixed at equal angles on the outer circumference of the upper part of the guide cone. A rotatable connection is made in the middle of the lower guide seat. The lower bushing is slidably connected to the outer circumferential wall of the guide shaft and the guide groove. The lower guide seat is equipped with a lifting mechanism, which is rotatably connected to the bottom of the guide shaft. The lifting mechanism is used to control the up-and-down movement and braking of the guide shaft. During the up-and-down movement of the guide shaft, the turbine blades can be intermittently inserted into the ventilation hole and completely disengaged from the ventilation hole. When the turbine blades are intermittently inserted into the ventilation hole, the guide cone can use the anti-slip texture to fit against the central conical structure of the ventilation hole to block the ventilation hole and brake the rotation of the guide cone along the axis. When the turbine blades are completely disengaged from the ventilation hole, the guide cone and the anti-slip texture disengage from the central conical structure of the ventilation hole to allow the ventilation hole to open.

[0013] Based on the above technical solution, the lifting mechanism includes a conical shell, a receiving chamber, a bidirectional lead screw, a slider, a transmission shaft, a connecting arm, a lifting seat, and a handwheel. The bottom of the lower guide seat is fixed with a conical shell, the bottom of which is an inverted pointed cone, and the upper part is cylindrical. The conical shell and the lower guide seat together form the receiving chamber. Each of the left and right sides of the receiving chamber is rotatably connected to a bidirectional lead screw arranged laterally along the front and rear sides. The external threads of the bidirectional lead screws at the front and rear sides have opposite directions, and each thread at the front and rear sides is connected to a slider. The two bidirectional lead screws are respectively coaxially and rigidly connected to the transmission shaft. The transmission shaft is rotatably connected to the receiving chamber and the lower guide shroud through a sealed connection. Each slider is slidably connected to the receiving chamber at the front and rear sides. Each component is hinged with a connecting arm. A lifting seat is slidably connected to the receiving chamber. The lifting seat is rotatably connected to the guide shaft to realize the rotational connection of the lifting mechanism relative to the guide shaft. The connecting arms hinged to the slider of the same bidirectional lead screw form a group. The ends of the two groups of connecting arms away from the slider are respectively hinged to the left and right parts of the lifting seat. The connecting arms are arranged horizontally to the left and right and parallel to each other relative to the virtual hinge axis of the slider and the lifting seat. The two transmission shafts are connected by gear meshing. One of the transmission shafts is also rigidly connected to a handwheel on the same axis. When the bidirectional lead screw rotates forward and backward, it can drive the sliders it is located to move closer and further apart, thereby driving the lifting seat to move up and down through the connecting arms.

[0014] Based on the above technical solution, a novel convection method utilizes the aforementioned SCR integrated water tube boiler structure, characterized by the following steps:

[0015] S1: Close the valve and continuously inject untreated water into the connection port at the bottom of the hot water exchange pipe through the water circulation system. At the same time, use the water circulation system to draw out the water discharged from the connection port at the top of the hot water exchange pipe.

[0016] S2: Fuel is fed into the furnace, and an external blower is used to supply air into the furnace to aid combustion. The smoke and dust produced after fuel combustion mix with the air after combustion to form flue gas. The flue gas is then processed or transported by intermediate devices and enters the SCR reactor. After being processed by the SCR reactor, the flue gas enters the outer shell through the lower guide hood, lower guide seat and guide hole. The flue gas exchanges heat with the hot water pipe and is discharged through the guide hole, upper guide seat and upper guide hood. The heat carried by the flue gas heats the water in the hot water pipe.

[0017] S3: To drain the wastewater from the hot water pipe, simply open the valve.

[0018] S4: When it is necessary to clean the scale inside the hot water exchange pipe, open the valve and use the water circulation system to inject water into the connection port at the top of the hot water exchange pipe to achieve reverse flushing of the scale inside the hot water exchange pipe. Then the sewage is discharged through the valve.

[0019] Compared with the prior art, the present invention has the following advantages: When the present invention is used, since the flue gas enters the inner cavity of the outer shell from the lower guide hood, lower guide seat and guide hole, the flow direction of the flue gas is parallel to the axis of the hot water exchange pipe, which can greatly reduce wind resistance and turbulence, thereby reducing pressure drop and thus reducing the power consumption of external blower and induced draft fan; it reduces ash accumulation and wear of hot water exchange pipe, increases the service life of hot water exchange pipe, and reduces the soot blowing frequency; it can appropriately reduce the spacing between hot water exchange pipes, thereby improving space utilization efficiency; due to the reduction of turbulence and wind resistance, reliability is improved, heating is more uniform, thermal stress is reduced, and safety is improved, while the multi-faceted cylindrical outer shell can also guide the flue gas and reduce the generation of lateral turbulence;

[0020] When the flue gas is stopped being fed into the casing, by opening the upper and lower opening and closing mechanisms, the dust accumulated on the top of the upper and lower guide seats can be discharged to a certain extent through the upper and lower drain ports under the action of gravity. Alternatively, external soot blowing equipment can be used to assist in the discharge, allowing the dust to move downward and be discharged through the lower guide hood, making it easier to collect and making dust removal more convenient.

[0021] When the inner lifting frame moves up and down, the upper bushing, in conjunction with the guide shaft and guide groove, drives the active outer gear ring to rotate, which in turn drives the driven outer gear ring to rotate, and then drives all the support rings to rotate together. This allows the brush bristles to clean the outer wall of the hot water pipe, making dust removal more convenient and ensuring heat exchange efficiency after long-term use. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the isometric structure of the present invention.

[0023] Figure 2 This is a schematic diagram showing the connection between the internal lifting frame and the hot water exchange pipe of the present invention.

[0024] Figure 3 This is a schematic diagram illustrating the engagement of the driven external gear ring and the driving external gear ring of the present invention.

[0025] Figure 4 This is a front view schematic diagram of the outer shell of the present invention when it is cut open.

[0026] Figure 5 This is a front view schematic diagram of the upper air guide cover, upper air guide seat, outer shell, lower air guide seat and lower air guide cover of the present invention in a front section.

[0027] In the diagram: 4. Outer shell; 5. Hot water pipe; 6. Lower guide shield; 7. Upper guide shield; 8. Connecting nozzle; 9. Valve; 10. Upper guide seat; 11. Lower guide seat; 12. Guide hole; 13. Upper drain port; 14. Lower drain port; 17. Guide cylinder; 18. Valve plate; 19. Valve port; 20. Support plate; 21. Support groove; 22. Crankshaft; 23. Support seat; 24. Servo motor; 25. Inner lifting frame; 26. Receiving hole; 27. Counterweight insert plate; 28. Cable hole; 29. ​​Upper... 30. Protective cover, fixed pulley, 31. outer lifting frame, 32. lower protective cover, 33. support ring, 34. bristles, 35. driven external gear ring, 37. guide shaft, 38. guide groove, 39. upper bushing, 40. driving external gear ring, 41. ventilation hole, 42. guide cone, 44. turbofan blade, 45. lower bushing, 47. cone shell, 48. receiving chamber, 49. double-acting lead screw, 50. slider, 51. drive shaft, 52. connecting arm, 53. lifting seat, 54. handwheel, 55. flexible cable. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] like Figures 1-5 As shown, an integrated SCR water tube boiler structure includes a boiler body, an SCR reactor, and an economizer. The flue gas outlet of the boiler body is connected to the SCR reactor and the economizer in sequence through an intermediate device. The economizer includes an outer shell 4, hot water exchange pipes 5, a lower guide shroud 6, and an upper guide shroud 7. The outer shell 4 is a vertically shaped multi-faceted cylinder. Multiple hot water exchange pipes 5 are vertically arranged and located in the inner cavity of the outer shell 4. The hot water exchange pipes 5 are made of stainless steel with smooth outer walls. The two ends of the hot water exchange pipes 5 are connected to an external water circulation system. The lower guide shroud 6 is rigidly connected to the bottom of the outer shell 4, and the upper guide shroud 7 is rigidly connected to the top.

[0030] The hot water exchange pipe 5 is a vertical cylindrical shape, with the top axially sealed and the bottom axially penetrating. The upper and lower parts of the hot water exchange pipe 5 are each radially fixedly connected with a connecting nozzle 8. The hot water exchange pipe 5 is connected to the external water circulation system through the connecting nozzles 8 at the upper and lower parts. The lower part of the hot water exchange pipe 5 is rigidly connected with a valve 9 for controlling the on / off state. The valve 9 is located below the connecting nozzle 8 at the lower part of the hot water exchange pipe 5.

[0031] The upper part of the outer casing 4 is rigidly connected to the upper flow guide seat 10 and the upper flow guide shroud 7 via flanges and fasteners, and the lower part is rigidly connected to the lower part of the outer casing 4 via flanges and fasteners. The upper flow guide shroud 7 is in the shape of an inverted frustum-shaped funnel, and the lower flow guide shroud 6 is in the shape of a frustum-shaped funnel. The upper flow guide seat 10 and the lower flow guide seat 11 are respectively provided with multiple circular flow guide holes 12 extending through them vertically. The upper flow guide shroud 7 and the lower flow guide shroud 6 are respectively connected to the inner cavity of the outer casing 4 through the flow guide holes 12. Each of the flow guide holes 12 is respectively inserted into the hot water exchange pipe 5 with a coaxial clearance. The fasteners are known prior art, such as bolts and nuts (simplified in the attached drawings, threads are not shown).

[0032] During use, since the flue gas enters the inner cavity of the outer shell 4 through the lower guide shroud 6, lower guide seat 11, and guide hole 12, the flow direction of the flue gas is parallel to the axis of the hot water exchange pipe 5. This greatly reduces wind resistance and turbulence, thereby reducing pressure drop and consequently reducing the power consumption of the external blower and induced draft fan. It also reduces ash accumulation and wear on the hot water exchange pipe 5, increases the service life of the hot water exchange pipe 5, and reduces the soot blowing frequency. It can appropriately reduce the spacing between the hot water exchange pipes 5, thereby improving space utilization efficiency. Due to the reduction of turbulence and wind resistance, reliability is improved, heating is more uniform, thermal stress is reduced, and safety is improved. The multi-faceted cylindrical outer shell 4 can also guide the flue gas and reduce the generation of lateral turbulence.

[0033] The bottom of the lower guide seat 11 is flat and converges towards the upper middle part. The bottom of the upper guide seat 10 is flat and converges towards the upper middle part. The upper guide seat 10 has an upper drain port 13 running through its circumference. The lower guide seat 11 has a lower drain port 14 running through its circumference. The upper guide seat 10 is equipped with an upper opening and closing mechanism. The lower guide seat 11 is equipped with a lower opening and closing mechanism. The upper opening and closing mechanism is used to control whether the upper drain port 13 is connected to the inner cavity of the outer shell 4 and the inner cavity of the upper guide cover 7. The lower opening and closing mechanism is used to control whether the lower drain port 14 is connected to the inner cavity of the outer shell 4 and the inner cavity of the lower guide cover 6. Multiple vertical guide cylinders 17 are fixed on the upper part of the lower guide seat 11. Each guide cylinder 17 corresponds vertically to each guide hole 12 and is coaxially and intermittently inserted into the outside of the hot water pipe 5.

[0034] Furthermore, when the flue gas is stopped being fed into the housing 4, by opening the upper and lower opening and closing mechanisms, the dust accumulated at the top of the upper guide seat 10 and the top of the lower guide seat 11 can be discharged to a certain extent through the upper drain port 13 and the lower drain port 14 under the action of gravity. Alternatively, external soot blowing equipment can be used to assist in the discharge, allowing the dust to move downward and be discharged through the lower guide hood 6 for easy collection and making dust removal more convenient. When the flue gas is fed into the housing 4, the upper and lower opening and closing mechanisms must be kept closed to prevent the flue gas from flowing from the upper drain port 13 and the lower drain port 14.

[0035] The upper opening and closing mechanism includes a valve plate 18, a valve port 19, a support plate 20, a support groove 21, a crankshaft 22, a support base 23, and a servo motor 24. Each of the upper drain ports 13 is slidably connected to a vertical valve plate 18. Each valve plate 18 has a valve port 19 horizontally extending through it, and a vertical support plate 20 is fixed to its top. Each support plate 20 has a horizontal support groove 21 extending through it. A crankshaft 22 is installed on each of the four sides of the upper guide seat 10. The main shaft of the crankshaft 22 is horizontally rotatably connected to the upper guide seat 10. The connecting rod shaft of the crankshaft 22 is slidably connected to the support groove 21, allowing it to slide and rotate horizontally within the support groove 21. The upper guide shroud 7 is rigidly connected to multiple... Each support base 23 is rigidly connected to a servo motor 24 with braking function. The rotating shaft of the servo motor 24 is connected to the main shaft of the crankshaft 22 via gear transmission. The servo motor 24 is electrically connected to an external electrical control system and power supply. When the servo motor 24 rotates, it drives the crankshaft 22 to rotate via gear transmission. When the crankshaft 22 rotates, it can move the support plate 20 and the valve plate 18 up and down by cooperating with the support groove 21. When the valve plate 18 moves up and down to a certain position, it can make the valve port 19 simultaneously connect with the inner cavity of the upper guide shroud 7, the upper drain port 13, and the inner cavity of the outer shell 4. When the valve plate 18 moves up and down to a certain position, it can completely block the upper drain port 13. In order to reduce the impact of high temperature on the servo motor 24, the support base 23 and the gear transmission with heat insulation material can be used, or a heat insulation pad can be installed between the servo motor 24 and the support base 23.

[0036] The lower opening and closing mechanism includes an inner lifting frame 25, receiving holes 26, counterweight plates 27, wire holes 28, an upper protective cover 29, fixed pulleys 30, an outer lifting frame 31, and a lower protective cover 32. The inner lifting frame 25 is slidably connected vertically within the outer shell 4. The inner lifting frame 25 has multiple receiving holes 26 extending vertically, each capable of being inserted into the outside of the guide tube 17. Multiple vertical counterweight plates 27 are fixed to the bottom of the inner lifting frame 25. Each counterweight plate 27 can be inserted vertically into the lower drain outlet 14 to achieve complete sealing, and can also disengage from the lower drain outlet 14 to allow communication between the lower drain outlet 14 and the inner cavity of the outer shell 4 and the lower guide cover 6. The upper part of the outer shell 4 has multiple horizontally extending wire holes 28 connecting to the outside, and multiple upper protective covers 29 are fixed to the upper outer wall. Each upper protective cover 29 is rotatably connected to a fixed pulley 30. The virtual pivot of the fixed pulley 30 is horizontally arranged. Each of the upper protective covers 29 is connected to the corresponding wire hole 28 and is symmetrically arranged with respect to the outer shell 4 in the horizontal direction. An outer lifting frame 31 is slidably connected to the outer shell 4. The outer lifting frame 31 is fixed with multiple lower protective covers 32 and is located below the lower protective covers 32. When each lower protective cover 32 slides up and down, it can be inserted into and disengaged from the upper protective cover 29 to realize the on / off control of the connection between the wire hole 28 and the outside world. The inner lifting frame 25 and the outer lifting frame 31 are connected by a high-temperature resistant flexible cable 55, such as a steel cable. The flexible cable 55 is guided by the wire hole 28 and the upper part of the fixed pulley 30 to achieve steering. Under the action of its own weight and the gravity of the counterweight plate 27, the inner lifting frame 25 always has a downward tendency and can drive the outer lifting frame 31 to move upward.

[0037] Furthermore, by manually pulling down the outer lifting frame 31, the inner lifting frame 25 can be dragged up, thereby disengaging the counterweight plate 27 from the lower drain outlet 14. Alternatively, a winch can be installed below the outer lifting frame 31, allowing the winch to pull down and release the outer lifting frame 31 via a rope, making operation more convenient. Whether released manually or by the winch, the inner lifting frame 25 can move down on its own, allowing the counterweight plate 27 to engage with the lower drain outlet 14, achieving a seal. At this time, the receiving hole 26 and the guide cylinder 17 are intermittently engaged.

[0038] Each of the aforementioned receiving holes 26 has a support ring 33 that rotates coaxially. The support ring 33 is interposed around the hot water pipe 5 and the guide tube 17, and its inner circumference is horizontally fixed with elastic, high-temperature resistant bristles 34. The bristles 34 are made of stainless steel or high-temperature alloy wire. A driven external gear ring 35 is coaxially fixed outside the support ring 33. The driven external gear ring 35 is located inside the inner lifting frame 25, and adjacent driven external gear rings 35 mesh with each other. The inner lifting frame 25 is equipped with a rotary drive mechanism, which includes a guide shaft 37, a guide groove 38, an upper bushing 39, and a driving external gear ring 40. The upper guide seat... The guide shaft 37, which can maintain relative stillness, is jointly installed on the 10 and the lower guide seat 11. The guide shaft 37 is vertically arranged and has a spiral guide groove 38 coaxially opened on its outer circumferential wall. The guide shaft 37 is slidably connected to the upper shaft sleeve 39. The upper shaft sleeve 39 is in close contact with the outer circumferential wall of the guide shaft 37 and the guide groove 38. The upper shaft sleeve 39 is coaxially fixed with the guide shaft 37 to the outside. When the upper shaft sleeve 39 moves up and down along the guide shaft 37, it can achieve forward and reverse rotation by cooperating with the guide groove 38. The active external gear ring 40 meshes with at least one of the driven external gear rings 35.

[0039] Furthermore, when the inner lifting frame 25 moves up and down, the upper bushing 39, in conjunction with the guide shaft 37 and the guide groove 38, can drive the active outer gear ring 40 to rotate, thereby driving the driven outer gear ring 35 to rotate, which in turn drives each support ring 33 to rotate together. This allows the bristles 34 to clean the outer wall of the hot water pipe 5, making dust removal more convenient and ensuring heat exchange efficiency after long-term use. When dust removal is not required, the bristles 34 fixed on the inner circumference of the support ring 33 can also be intermittently inserted into the outside of the guide tube 17, thereby avoiding obstruction of normal flue gas flow.

[0040] The rotary drive mechanism also includes a ventilation hole 41, a guide cone 42, anti-slip textures, turbofan blades 44, a lower bushing 45, and a lifting mechanism. The guide shaft 37 is located in the middle of the upper guide seat 10 and the lower guide seat 11. The upper guide seat 10 has a ventilation hole 41 running vertically through its middle section. The upper diameter of the ventilation hole 41 is larger than its lower diameter, and the upper part of the ventilation hole 41 transitions into a funnel shape from top to bottom. The top of the guide shaft 37 is coaxially fixed with a guide cone 42. The bottom of the guide cone 42 is conical with a downward protrusion, and the upper part is cylindrical. The bottom conical surface of the guide cone 42 is provided with anti-slip textures (not shown in the attached figure). The guide shaft 37 is coaxially and gappedly inserted into the ventilation hole 41. Multiple turbofan blades 44 are fixed at equal angles on the outer circumference of the upper part of the guide cone 42. The lower bushing is rotatably connected to the middle of the lower guide seat 11. 45. The lower bushing 45 is slidably connected to the outer circumferential wall of the guide shaft 37 and the guide groove 38. The lower guide seat 11 is equipped with a lifting mechanism. The lifting mechanism is rotatably connected to the bottom of the guide shaft 37. The lifting mechanism is used to control the up and down movement and braking of the guide shaft 37. During the up and down movement of the guide shaft 37, the turbofan blade 44 can be intermittently inserted into the ventilation hole 41 and completely disengaged from the ventilation hole 41. When the turbofan blade 44 is intermittently inserted into the ventilation hole 41, the guide cone 42 can use the anti-slip texture to fit with the central conical structure of the ventilation hole 41 to block the ventilation hole 41 and brake the rotation of the guide cone 42 along the axis. When the turbofan blade 44 is completely disengaged from the ventilation hole 41, the guide cone 42 and the anti-slip texture disengage from the central conical structure of the ventilation hole 41 to achieve the opening of the ventilation hole 41.

[0041] Furthermore, the lifting mechanism can be used to raise and lower the guide shaft 37 and brake it. When cleaning the outer wall of the hot water pipe 5, the flue gas supply is stopped first, then the upper opening and closing mechanism is opened, and then the inner lifting frame 25 is moved up and down. At this time, some of the dust on the top of the lower guide seat 11 is discharged through the lower drain port 14. Then the guide shaft 37 is raised so that the guide cone 42 can release the blockage of the ventilation hole 41. Subsequently, air is sent into the outer casing 4 through the upper guide cover 7 using external equipment such as blowers. Air flows downward through the guide hole 12, the upper drain port 13, and the ventilation hole 41, carrying the accumulated dust at the top of the upper guide seat 10 downward. When the air passes through the ventilation hole 41, it can drive the turbine blades 44 to rotate rapidly, thereby driving the guide shaft 37 to rotate rapidly, which in turn can indirectly drive the support ring 33 to rotate rapidly. This allows the brush bristles 34 to quickly clean the outer wall of the hot water exchange pipe 5, thereby improving the dust removal effect and efficiency, making it more convenient to use, and helping to ensure heat exchange efficiency after long-term use.

[0042] The lifting mechanism includes a conical shell 47, a receiving chamber 48, a bidirectional lead screw 49, a slider 50, a drive shaft 51, a connecting arm 52, a lifting seat 53, and a handwheel 54. The bottom of the lower guide seat 11 is fixed with a conical shell 47. The bottom of the conical shell 47 is an inverted pointed cone, and the upper part is cylindrical. The conical shell 47 and the lower guide seat 11 together form the receiving chamber 48. The left and right sides of the receiving chamber 48 are each rotatably connected to a bidirectional lead screw 49 arranged laterally along the front and rear sides. The external threads of the bidirectional lead screw 49 at the front and rear sides have opposite directions, and each thread at the front and rear sides is connected to a slider 50. The two bidirectional lead screws 49 are respectively coaxially rigidly connected to the drive shaft 51. The drive shaft 51 is rotatably connected to the receiving chamber 48 and the lower guide shroud 6 through a sealed connection. Each slider 50 is slidably connected to the receiving chamber 48 at the front and rear sides, and is respectively hinged. A connecting arm 52 is connected to a lifting seat 53 that slides vertically within the receiving chamber 48. The lifting seat 53 is rotatably connected to the guide shaft 37, enabling the lifting mechanism to rotate relative to the guide shaft 37. The connecting arms 52 hinged to the slider 50 where the same bidirectional lead screw 49 is located form a group. The ends of the two groups of connecting arms 52 away from the slider 50 are respectively hinged to the left and right sides of the lifting seat 53. The connecting arms 52 are arranged horizontally to the left and right and parallel to each other relative to the virtual hinge axes of the slider 50 and the lifting seat 53. The two transmission shafts 51 are connected by gear meshing for transmission. One of the transmission shafts 51 is also rigidly connected to a handwheel 54 on the same axis. When the bidirectional lead screw 49 rotates forward and backward, it can drive the slider 50 where it is located to move closer and further away from each other, thereby driving the lifting seat 53 to move up and down through the connecting arm 52.

[0043] By manually turning the handwheel 54 forward and backward, the gear transmission can drive the two bidirectional lead screws 49 to rotate in both directions, so that the two sliders 50 where each bidirectional lead screw 49 is located move closer or further away synchronously. This allows the connecting arm 52 to drive the lifting seat 53 to rise or fall, thus realizing the up and down movement of the guide shaft 37.

[0044] A novel convection method, utilizing the aforementioned SCR integrated water tube boiler structure, includes the following steps:

[0045] S1: Close valve 9 and continuously inject untreated water into the connection port 8 at the bottom of the hot water exchange pipe 5 through the water circulation system. At the same time, use the water circulation system to draw out the water discharged from the connection port 8 at the top of the hot water exchange pipe 5.

[0046] S2: Fuel is fed into the furnace, and an external blower is used to blow air into the furnace to aid combustion. The smoke and dust produced after the fuel combustion mix with the air after combustion to form flue gas. The flue gas is then processed or transported by an intermediate device and enters the SCR reactor (the intermediate device is a known prior art, which can be a pipe or other device used to treat exhaust gas). After being processed by the SCR reactor, the flue gas enters the outer shell 4 through the lower guide hood 6, the lower guide seat 11 and the guide hole 12. After heat exchange with the hot water exchange pipe 5, the flue gas is discharged through the guide hole 12, the upper guide seat 10 and the upper guide hood 7. If necessary, an induced draft fan can be added outside the upper guide hood 7. The heat carried by the flue gas heats the water in the hot water exchange pipe 5.

[0047] S3: When it is necessary to drain the sewage in hot water pipe 5, simply open valve 9;

[0048] S4: When it is necessary to clean the scale inside the hot water exchange pipe 5, open the valve 9 and use the water circulation system to inject water into the connection port 8 at the top of the hot water exchange pipe 5 to achieve reverse flushing of the scale inside the hot water exchange pipe 5. Then the sewage is discharged through the valve 9.

[0049] The above description represents a preferred embodiment of the present invention. For those skilled in the art, any changes, modifications, substitutions, and variations made to the implementation methods without departing from the principles and spirit of the present invention, based on the teachings of the present invention, still fall within the protection scope of the present invention.

Claims

1. A structure for an integrated SCR water-tube boiler, comprising a boiler body, an SCR reactor, and an economizer, wherein the flue gas outlet of the boiler body is connected to the SCR reactor and the economizer sequentially via an intermediate device, characterized in that: The energy-saving device includes a shell (4), a hot water exchange pipe (5), a lower guide shroud (6), and an upper guide shroud (7). The shell (4) is a vertical multi-faceted cylindrical shape. The multiple hot water exchange pipes (5) are respectively arranged vertically, and the middle part is located in the inner cavity of the shell (4). The two ends of the hot water exchange pipes (5) are connected to the external water circulation system. The bottom of the shell (4) is rigidly connected to the lower guide shroud (6), and the upper part is rigidly connected to the upper guide shroud (7).

2. The SCR integrated water tube boiler structure according to claim 1, characterized in that: The hot water exchange pipe (5) is a vertical cylindrical shape, with the top axially sealed and the bottom axially penetrating. The upper and lower parts of the hot water exchange pipe (5) are each radially fixedly connected with a connecting nozzle (8). The hot water exchange pipe (5) is connected to the external water circulation system through the connecting nozzles (8) at the upper and lower parts. The lower part of the hot water exchange pipe (5) is rigidly connected with a valve (9) for controlling the on / off state. The valve (9) is located below the connecting nozzle (8) at the lower part of the hot water exchange pipe (5).

3. The SCR integrated water tube boiler structure according to claim 1, characterized in that: The upper part of the outer shell (4) is rigidly connected to the upper guide seat (10) and the upper guide shroud (7) via flanges and fasteners, and the lower part is rigidly connected to the lower part via flanges and fasteners. The upper guide shroud (7) is in the shape of an inverted frustum funnel, and the lower guide shroud (6) is in the shape of a frustum funnel. The upper guide seat (10) and the lower guide seat (11) are respectively provided with multiple circular guide holes (12) running through them. The upper guide shroud (7) and the lower guide shroud (6) are respectively connected to the inner cavity of the outer shell (4) via the guide holes (12). Each of the guide holes (12) is respectively inserted into the hot water pipe (5) with a coaxial gap.

4. The SCR integrated water tube boiler structure according to claim 3, characterized in that: The lower guide seat (11) has a flat bottom end and converges towards the upper middle part. The upper guide seat (10) has a flat bottom end and converges towards the upper middle part. The upper guide seat (10) has an upper drain outlet (13) running through its four sides. The lower guide seat (11) has a lower drain outlet (14) running through its four sides. The upper guide seat (10) is equipped with an upper opening and closing mechanism. The lower guide seat (11) is equipped with a lower opening and closing mechanism. The upper opening and closing mechanism is used to control... Whether the upper drain outlet (13) is connected to the inner cavity of the outer shell (4) and the inner cavity of the upper guide shroud (7), the lower opening and closing mechanism is used to control whether the lower drain outlet (14) is connected to the inner cavity of the outer shell (4) and the inner cavity of the lower guide shroud (6), and multiple vertical guide cylinders (17) are fixed on the upper part of the lower guide seat (11). Each of the guide cylinders (17) corresponds to each guide hole (12) above and below, and is coaxially and gappedly inserted into the outside of the hot water pipe (5).

5. The SCR integrated water tube boiler structure according to claim 4, characterized in that: The upper opening and closing mechanism includes a valve plate (18), a valve port (19), a support plate (20), a support groove (21), a crankshaft (22), a support seat (23), and a servo motor (24). Each of the upper drain ports (13) is slidably connected to a vertical valve plate (18) on its upper and lower sides. Each of the valve plates (18) is horizontally connected to a valve port (19), and each of the valve plates (18) is fixed with a vertical support plate (20) at its top. Each of the support plates (20) is connected to a horizontal support groove (21). The upper guide seat (10) is equipped with a crankshaft (22) on its front, back, left, and right sides. The main shaft of the crankshaft (22) is horizontally rotatably connected to the upper guide seat (10). The connecting rod shaft of the crankshaft (22) is slidably connected to the support groove (21). The connecting rod shaft of the crankshaft (22) can slide and rotate horizontally within the support groove (21). The upper guide cover (7) is rigidly connected. There are multiple support seats (23), and each support seat (23) is rigidly connected to a servo motor (24) with braking function. The rotating shaft of the servo motor (24) is connected to the main shaft of the crankshaft (22) through gear transmission. The servo motor (24) is electrically connected to the external electrical control system and power supply. When the servo motor (24) rotates, it can drive the crankshaft (22) to rotate through gear transmission. When the crankshaft (22) rotates, it can make the support plate (20) and valve plate (18) move up and down through cooperation with the support groove (21). When the valve plate (18) moves up and down to a certain position, it can make the valve port (19) simultaneously connected to the inner cavity of the upper guide shroud (7), the upper drain port (13) and the inner cavity of the outer shell (4). When the valve plate (18) moves up and down to a certain position, it can make the valve plate (18) completely block the upper drain port (13).

6. The SCR integrated water tube boiler structure according to claim 4, characterized in that: The lower opening and closing mechanism includes an inner lifting frame (25), a receiving hole (26), a counterweight plate (27), a wire hole (28), an upper cover (29), a fixed pulley (30), an outer lifting frame (31), and a lower cover (32). The inner lifting frame (25) is slidably connected to the outer shell (4) vertically. The inner lifting frame (25) has multiple receiving holes (26) running through it vertically. Each receiving hole (26) can be inserted into the outside of the guide tube (17). The bottom of the inner lifting frame (25) is fixed with... Multiple vertical counterweight plates (27) are provided. Each counterweight plate (27) can be inserted into the lower drain port (14) to achieve complete closure, and can also be disconnected from the lower drain port (14) to achieve communication between the lower drain port (14) and the inner cavity of the outer shell (4) and the inner cavity of the lower guide shroud (6). The upper part of the outer shell (4) has multiple horizontal through holes (28) for connecting to the outside, and multiple upper protective covers (29) are fixed on the upper outer wall. Each upper protective cover (29) is rotatably connected to a fixed... The pulley (30) has a virtual rotating shaft that is horizontally arranged. Each of the upper guards (29) is connected to the wire hole (28) and is symmetrically arranged with respect to the outer shell (4) in the horizontal direction. An outer lifting frame (31) is slidably connected to the outer shell (4) and the outer lifting frame (31) is fixed with multiple lower guards (32) and located below the lower guards (32). When each of the lower guards (32) slides up and down, it can make the lower guard (32) and the upper guard (28) slid together. 29) Connecting and disconnecting the connection to achieve on / off control of the connection between the wire hole (28) and the outside world. The inner lifting frame (25) and the outer lifting frame (31) are connected by a high-temperature resistant flexible cable (55). The flexible cable (55) is guided by the upper part of the wire hole (28) and the fixed pulley (30) to achieve steering. Under the gravity of its own weight and the counterweight plate (27), the inner lifting frame (25) always has a downward tendency and can drive the outer lifting frame (31) to move upward.

7. The SCR integrated water tube boiler structure according to claim 6, characterized in that: Each of the aforementioned receiving holes (26) has a support ring (33) that rotates coaxially. The support ring (33) is interposed outside the hot water pipe (5) and the guide tube (17), and has elastic, high-temperature resistant bristles (34) fixed horizontally on its inner circumference. A driven external gear ring (35) is coaxially fixed outside the support ring (33). The driven external gear ring (35) is located inside the inner lifting frame (25), and adjacent driven external gear rings (35) mesh with each other. The inner lifting frame (25) is equipped with a rotary drive mechanism, which includes a guide shaft (37), a guide groove (38), an upper bushing (39), and a driving external gear ring (40). The upper guide seat (10) and the lower guide seat (11) are also included. A guide shaft (37) capable of maintaining relative stillness is installed together. The guide shaft (37) is vertically arranged, and a spiral guide groove (38) is coaxially opened on the outer circumferential wall. An upper bushing (39) is slidably connected to the guide shaft (37). The upper bushing (39) is in close contact with the outer circumferential wall of the guide shaft (37) and the guide groove (38). An active external gear ring (40) is fixed coaxially with the guide shaft (37) on the outer side of the upper bushing (39). When the upper bushing (39) moves up and down along the guide shaft (37), it can achieve forward and reverse rotation by cooperating with the guide groove (38). The active external gear ring (40) meshes with at least one of the driven external gear rings (35).

8. The SCR integrated water tube boiler structure according to claim 7, characterized in that: The rotary drive mechanism also includes a ventilation hole (41), a guide cone (42), anti-slip texture, a turbofan blade (44), a lower bushing (45), and a lifting mechanism. The guide shaft (37) is located in the middle of the upper guide seat (10) and the lower guide seat (11). The upper guide seat (10) has a ventilation hole (41) running vertically through its middle section. The upper diameter of the ventilation hole (41) is large, while the lower diameter is small. The upper part of the ventilation hole (41) transitions downwards in a funnel shape. A guide cone (42) is coaxially fixed to the top of the guide shaft (37). The bottom of the guide cone (42) is conical with a downward protrusion, and the upper part is cylindrical. The bottom conical surface of the guide cone (42) is provided with anti-slip texture. The guide shaft (37) is coaxially and gapped into the ventilation hole (41). Multiple turbofan blades (44) are fixed at equal angles on the outer circumference of the upper part of the guide cone (42). A lower bushing (45) is rotatably connected to the middle of the lower guide seat (11). The lower bushing (45) is slidably connected to the outer circumferential wall of the guide shaft (37) and the guide groove (38). The lower guide seat (11) is equipped with a lifting mechanism. The lifting mechanism is rotatably connected to the bottom of the guide shaft (37). The lifting mechanism is used to control the up and down movement and braking of the guide shaft (37). During the up and down movement of the guide shaft (37), the turbine blade (44) can be intermittently inserted into the ventilation hole (41) and completely disengaged from the ventilation hole (41). When the turbine blade (44) is intermittently inserted into the ventilation hole (41), the guide cone (42) can use the anti-slip texture to fit with the middle conical structure of the ventilation hole (41) to block the ventilation hole (41) and brake the rotation of the guide cone (42) along the axis. When the turbine blade (44) is completely disengaged from the ventilation hole (41), the guide cone (42) and the anti-slip texture disengage from the middle conical structure of the ventilation hole (41) to achieve the opening of the ventilation hole (41).

9. The SCR integrated water tube boiler structure according to claim 8, characterized in that: The lifting mechanism includes a conical shell (47), a receiving chamber (48), a two-way lead screw (49), a slider (50), a drive shaft (51), a connecting arm (52), a lifting seat (53), and a handwheel (54). The bottom of the lower guide seat (11) is fixed with a conical shell (47). The bottom of the conical shell (47) is an inverted pointed cone, and the upper part is cylindrical. The conical shell (47) and the lower guide seat (11) together form the receiving chamber (48). The left and right sides of the receiving chamber (48) are each rotatably connected to a two-way lead screw (49) arranged horizontally in the front and back directions. The external threads of the two-way lead screw (49) are opposite in direction, and each thread of the front and back sides is connected to a slider (50). The two two-way lead screws (49) are respectively coaxially rigidly connected to the drive shaft (51). The drive shaft (51) is rotatably connected to the receiving chamber (48) and the lower guide shroud (6) through a sealed connection. Each slider (50) is slidably connected to the receiving chamber (48) in the front and back directions. Each is hinged with a connecting arm (52). The accommodating chamber (48) is slidably connected to a lifting seat (53). The lifting seat (53) is rotatably connected to the guide shaft (37) to realize the rotational connection of the lifting mechanism relative to the guide shaft (37). The connecting arms (52) hinged to the slider (50) where the same bidirectional screw (49) is located are a group. The ends of the two groups of connecting arms (52) away from the slider (50) are respectively hinged to the left and right sides of the lifting seat (53). The connecting arms (52) are arranged horizontally to the left and right and parallel to each other relative to the virtual hinge axis of the slider (50) and the lifting seat (53). The two transmission shafts (51) are connected by gear meshing. One of the transmission shafts (51) is also rigidly connected to a handwheel (54) on the same axis. When the bidirectional screw (49) rotates forward and backward, it can drive the slider (50) where it is located to move closer and further away from each other, thereby driving the lifting seat (53) to move up and down through the connecting arm (52).

10. A novel convection method, using the SCR integrated water tube boiler structure described in any one of claims 3-9, characterized in that, Includes the following steps: S1: Close the valve (9) and continuously inject untreated water into the connection port (8) at the bottom of the hot water exchange pipe (5) through the water circulation system. At the same time, use the water circulation system to draw out the water discharged from the connection port (8) at the top of the hot water exchange pipe (5). S2: Fuel is fed into the furnace and air is supplied into the furnace by an external blower to aid combustion. The smoke and dust produced after the fuel combustion mix with the air after combustion to form flue gas. The flue gas is then processed or transported by intermediate devices and enters the SCR reactor. After being processed by the SCR reactor, the flue gas enters the outer shell (4) through the lower guide hood (6), the lower guide seat (11) and the guide hole (12). The flue gas exchanges heat with the hot water pipe (5) and is discharged through the guide hole (12), the upper guide seat (10) and the upper guide hood (7). The heat carried by the flue gas heats the water in the hot water pipe (5). S3: When it is necessary to drain the sewage in the hot water pipe (5), simply open the valve (9); S4: When it is necessary to clean the scale in the hot water pipe (5), open the valve (9) and use the water circulation system to inject water into the connection port (8) at the top of the hot water pipe (5) to achieve reverse flushing of the scale in the hot water pipe (5), and then the sewage is discharged through the valve (9).

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