A flue gas preheating boiler with energy-saving top-blown heat exchanger

Abstract

The present invention relates to the technical field of flue gas preheating, and discloses a flue gas preheating heating boiler of an energy-saving top-blown heat exchanger, comprising: a heat exchanger main body, one side of the heat exchanger main body is connected to a heat exchange furnace body, the top of the heat exchange furnace body is connected to a heat exchange tube, and a check valve is installed inside the heat exchange furnace body; a filtering mechanism, the filtering mechanism is located inside the heat exchange furnace body, the filtering mechanism comprises a layered filtering component, a preheating component and a positioning component; through the setting of the filtering mechanism, the flue gas in the preheating process can be filtered to prevent particles, dust or other impurities in the flue gas from being deposited inside the heat exchange furnace body, thereby improving the preheating efficiency, reducing the damage to the heat exchange furnace body, extending its service life, and not easily causing equipment failure. At the same time, it solves the problem of more frequent cleaning, maintenance or replacement of parts in traditional devices, increasing maintenance costs and workload, thereby reducing overall energy consumption.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas preheating, and in particular to a flue gas preheating heating boiler of an energy-saving top-blown heat exchanger. Background Art

[0002] The flue gas heating furnace of the heat exchanger is a device that uses the heat in the flue gas to heat a certain medium. It is usually used in industrial production to improve energy utilization efficiency. The flue gas contains a large amount of thermal energy. If it is not utilized and directly discharged into the atmosphere, it is not only a waste of energy, but also may cause environmental pollution. Therefore, the heat in the flue gas can be transferred to water, air or other working fluids through the heat exchanger, so that the heat can be reused.

[0003] Traditional heat exchangers are used to transfer heat, so that heat exchange can be carried out between two or more fluids at different temperatures, thereby realizing processes such as heating, cooling, condensation or evaporation, maximizing the efficiency of heat transfer, ensuring that the two fluids do not directly contact each other to prevent pollution or chemical reactions. Flue gas enters the heat exchanger from the high-temperature end, and cold fluid enters from the low-temperature end, and heat is exchanged through the heat transfer wall of the heat exchanger. After the flue gas temperature is reduced, it is discharged into the atmosphere or subsequent treatment system, and the preheated medium is output to the burner to improve the combustion efficiency or the energy utilization efficiency of the process system, which not only realizes waste heat recovery and reduces energy consumption, but also extends the life of the equipment; however, it is difficult to filter the waste heat during preheating treatment, resulting in particulate matter, dust or other impurities in the flue gas being deposited inside the heat exchange furnace body, reducing the preheating efficiency, and easily damaging the heat exchange furnace body, shortening its service life, causing equipment failure, and requiring more frequent cleaning, maintenance or replacement of parts, increasing maintenance costs and workload, thereby increasing overall energy consumption. Summary of the invention

[0004] The purpose of the present invention is to provide an energy-saving top-blown heat exchanger flue gas preheating heating boiler, which solves the problem in the background technology that it is difficult to filter the waste heat during preheating, resulting in particulate matter, dust or other impurities in the flue gas being deposited inside the heat exchange furnace body, reducing the preheating efficiency.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A flue gas preheating heating boiler with an energy-saving top-blown heat exchanger comprises: a heat exchanger body, one side of the heat exchanger body is connected to a heat exchange furnace body, the top of the heat exchange furnace body is connected to a heat exchange tube, and a check valve is installed inside the heat exchange furnace body, the check valve is mainly used to prevent the flue gas from flowing back from the heat exchange furnace body into the heat exchanger body, which greatly improves the connectivity between the heat exchanger body and the heat exchange furnace body, and preventing the flue gas from flowing back can ensure that the heat in the flue gas is fully utilized, reduce heat waste, improve heat exchange efficiency, and further improve the overall thermal efficiency of the boiler; a filtering mechanism, the filtering mechanism is located inside the heat exchange furnace body and is used to filter the flue gas of the heat exchanger body, the filtering mechanism comprises a layered filtering assembly, a preheating assembly and a positioning assembly, the layered filtering assembly is located inside the heat exchange furnace body and is used to filter the flue gas in layers, the preheating assembly is located at the lower part of the layered filtering assembly and is used to preheat the flue gas, and the positioning assembly is located between the heat exchange furnace body and the layered filtering assembly and is used to position the layered filtering assembly.

[0007] Preferably, the preheating assembly includes baffle plates fixed on both sides of the interior of the heat exchange furnace body, a resistive heater is arranged between the two baffle plates, the resistive heater extends to one side of the heat exchange furnace body and is installed with a temperature control plate, the temperature control plate is a common temperature control assembly on the market and is used to control the temperature emitted by the resistive heater, thereby improving the heating efficiency, ensuring temperature uniformity and stability; reducing energy waste and operating costs; extending equipment life and reducing losses and failures caused by temperature fluctuations.

[0008] Preferably, the layered filter assembly includes a filter seat installed on the top of two barrier plates and a filter hole opened on the top of the filter seat, a first filter plate and a second filter plate corresponding to the filter hole are installed inside the filter seat, and a slider is fixed to the bottom of the filter seat, a slide groove for sliding the slider is opened on the top of the barrier plate, and two control grooves are opened on one side of the filter seat, and the two control grooves are mainly used to facilitate pulling the filter seat to move on the barrier plate, so as to facilitate the user to disassemble the filter seat and save labor.

[0009] Preferably, the positioning assembly includes a plurality of bolts threaded onto the outer wall of the heat exchange furnace body, a linkage rod is installed on one side of the bolt, an extrusion sleeve is rotatably installed on one side of the linkage rod, the extrusion sleeve corresponds to the outer wall of the filter seat, and the two sides of the filter seat are squeezed by the extrusion sleeve, thereby positioning the filter seat, ensuring that it can be more stable during operation, reducing local stress concentration, and extending the service life of the filter seat and related components.

[0010] Preferably, a disassembly mechanism for facilitating disassembly of the filter seat is provided on one side of the heat exchange furnace body, the disassembly mechanism includes a take-in and put-out port opened on one side of the heat exchange furnace body, a storage groove is opened on the top of the take-in and put-out port, a closing plate corresponding to the take-in and put-out port is provided inside the storage groove, a sealing strip is installed on the outer wall of the closing plate, and a control component for controlling the closing plate is provided on the top of the closing plate. Through the setting of the sealing strip, the closing plate can seal the take-in and put-out port when closed, thereby ensuring that heat energy is fully utilized, reducing heat loss, and further improving the thermal efficiency of the heat exchange furnace. By reducing heat leakage, the fuel or electricity consumption required by the heat exchange furnace during operation will be reduced, thereby increasing energy utilization.

[0011] Preferably, the control component includes two movable rods fixed on the top of the closing plate, a frame is fixed on the top of the heat exchange furnace body, the two movable rods extend to the top of the frame and a control panel is installed together, and a limit assembly for limiting the two movable rods is arranged between the frame and the two movable rods. Through the setting of the control panel, the user can save more effort when pulling the two movable rods.

[0012] Preferably, the limit assembly includes two fixed seats fixed on the top of the frame, a bidirectional screw is rotatably installed between the two fixed seats, the outer wall of the bidirectional screw is screwed with two threaded blocks, and one side of the two threaded blocks is provided with a plug-in assembly for plugging two movable rods, wherein a control sleeve is provided on the outer wall in the middle of the bidirectional screw. Through the setting of the control sleeve, the staff can rotate the bidirectional screw more smoothly, the friction between the staff and the bidirectional screw is increased, the rotation is facilitated, and labor is further saved.

[0013] Preferably, the plug-in assembly includes a movable plate fixed on one side of the threaded block, a positioning rod is fixed on one side of the movable plate, and the positioning rod is plugged into the movable rod. Through the mutual plug-in of the positioning rod and the movable rod, the closing plate can be effectively positioned when closed, avoiding the situation where the closing plate causes shaking in the access port due to external factors, thereby improving the stability of the device in sealing the access port.

[0014] Preferably, a linkage plate is fixed to one side of the threaded block relative to the movable plate, protrusions are fixed to both sides of the bottom of the linkage plate, a fixing groove for sliding the linkage plate is formed on the top of the frame, and limiting grooves for sliding the protrusions are formed on both sides of the fixing groove.

[0015] Preferably, a sealing mechanism for closing the heat exchange tube is provided on one side of the heat exchange furnace body, and the sealing mechanism includes an extension seat fixed on one side of the heat exchange furnace body, a groove cavity is jointly provided between the heat exchange furnace body and the extension seat, a sealing plate matching the bottom of the heat exchange tube is provided inside the groove cavity, two support plates are fixed to the top of the heat exchange furnace body and the extension seat, a threaded rod is rotatably installed between the two support plates, a fixed block is fixed to one side of the extension seat, a driving motor is installed on the top of the fixed block, the output end of the driving motor is connected to the threaded rod, a moving block is screwed on the outer wall of the threaded rod, a connecting plate is connected between the moving block and the sealing plate, and an open groove for sliding the connecting plate is provided on the top of the extension seat.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0017] 1. The present invention can filter the flue gas during the preheating process by setting a filtering mechanism, so as to prevent particulate matter, dust or other impurities in the flue gas from being deposited inside the heat exchange furnace body, thereby improving the preheating efficiency, reducing damage to the heat exchange furnace body, extending its service life, and not easily causing equipment failure. At the same time, it solves the problem of more frequent cleaning, maintenance or replacement of parts in traditional devices, increasing maintenance costs and workload, thereby reducing overall energy consumption;

[0018] 2. The present invention can realize the rapid disassembly of the filter mechanism through the setting of the disassembly mechanism, which is convenient for replacement, reducing the downtime caused by filter material blockage, thereby improving the operation efficiency and continuity of the equipment. Replacing the filter component can effectively prevent impurity accumulation and corrosion, protect the internal structure of the heat exchange furnace body, further extend the service life of the equipment, and facilitate maintenance personnel to quickly locate the problem and make necessary repairs or replacements, greatly improving the filtering efficiency of the device;

[0019] 3. The present invention can seal the heat exchange furnace body by setting a sealing mechanism, effectively reducing heat loss, preventing hot air from escaping easily and preventing cold air from penetrating, thereby ensuring that heat can be concentrated inside the heat exchange furnace body, thereby improving thermal efficiency. By sealing the heat exchange furnace body, the stability of the interior of the heat exchange furnace body can be maintained, further saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 is a cross-sectional view of the heat exchange furnace body;

[0022] Figure 3 It is a structural schematic diagram of the filtering mechanism of the present invention;

[0023] Figure 4 is a cross-sectional view of the filter mechanism of the present invention;

[0024] Figure 5 It is a structural schematic diagram of the positioning assembly of the present invention;

[0025] Figure 6 This is one of the structural schematic diagrams of the disassembly mechanism of the present invention;

[0026] Figure 7 This is the second structural schematic diagram of the disassembly mechanism of the present invention;

[0027] Figure 8 It is a structural schematic diagram of the cleaning and sealing mechanism of the present invention;

[0028] Fig. 9 It is a structural schematic diagram of the threaded rod of the present invention.

[0029] Among them: 1. Heat exchanger body; 2. Heat exchange furnace body; 3. Filter mechanism; 4. Disassembly mechanism; 5. Sealing mechanism; 6. Heat exchange tube; 7. Check valve;

[0030] 31. Blocking plate; 32. Bolt; 33. Filter seat; 34. Temperature control plate; 35. Filter hole; 36. Extrusion sleeve; 37. Resistive heater; 38. Control slot; 39. Slider; 310. First filter plate; 311. Second filter plate; 312. Linkage rod;

[0031] 41. Closing plate; 42. Sealing strip; 43. Movable rod; 44. Frame; 45. Control panel; 46. Fixed seat; 47. Bidirectional screw; 48. Positioning rod; 49. Threaded block; 410. Linkage plate; 411. Movable plate;

[0032] 51. Extension seat; 52. Driving motor; 53. Support plate; 54. Threaded rod; 55. Moving block; 56. Sealing plate; 57. Fixed block; 58. Connecting plate. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Please refer to Figure 1 and Figure 2 A flue gas preheating boiler with an energy-saving top-blown heat exchanger comprises: a heat exchanger body 1, a heat exchange furnace body 2 is connected to one side of the heat exchanger body 1, a heat exchange pipe 6 is connected to the top of the heat exchange furnace body 2, and a check valve 7 is installed inside the heat exchange furnace body 2.

[0035] Please refer to Figure 2 - Figure 5 , the filtering mechanism 3 is located inside the heat exchange furnace body 2 and is used to filter the flue gas of the heat exchanger main body 1. The filtering mechanism 3 includes a layered filtering component, a preheating component and a positioning component. The layered filtering component is located inside the heat exchange furnace body 2 and is used to filter the flue gas in layers. The preheating component is located at the lower part of the layered filtering component and is used to preheat the flue gas. The positioning component is located between the heat exchange furnace body 2 and the layered filtering component and is used to position the layered filtering component. The preheating component includes a baffle plate 31 fixed on both sides of the heat exchange furnace body 2. A resistive heater 37 is arranged between the two baffle plates 31. The resistive heater 37 extends to one side of the heat exchange furnace body 2 and is installed with a temperature The control plate 34, the layered filter assembly includes a filter seat 33 installed on the top of the two baffle plates 31 and a filter hole 35 opened on the top of the filter seat 33, the filter seat 33 is internally installed with a first filter plate 310 and a second filter plate 311 corresponding to the filter hole 35, and a slider 39 is fixed to the bottom of the filter seat 33, the baffle plate 31 is provided with a slide groove for the slider 39 to slide, and one side of the filter seat 33 is provided with two control grooves 38, and the positioning assembly includes a plurality of bolts 32 screwed to the outer wall of the heat exchange furnace body 2, a linkage rod 312 is installed on one side of the bolt 32, and an extrusion sleeve 36 is rotatably installed on one side of the linkage rod 312, and the extrusion sleeve 36 corresponds to the outer wall of the filter seat 33;

[0036] The flue gas is transported to the heat exchange furnace body 2, and the temperature control board 34 controls the resistance heater 37 to work. After the flue gas is heated by the resistance heater 37, a preheating effect is formed. When the flue gas is heated, it moves upward, and the heated flue gas is filtered for the first time through the first filter plate 310, and then the flue gas after the first filtration is filtered again through the second filter plate 311, and finally discharged through the filter hole 35. By filtering the flue gas multiple times, the dirt in the flue gas can be effectively purified, and the flue gas is safer when reused. At the same time, it meets the emission standards and reduces the damage to the environment, thereby improving the efficiency of the device in filtering the flue gas. The principle of hot air rising is used to allow the heated flue gas to rise to the heat exchange The exhaust of hot gas can be used to perform operations, thereby improving resource utilization. When the filter seat 33 is working, the bolt 32 is first rotated to drive the linkage rod 312 to move, and the linkage rod 312 drives the extrusion sleeve 36 to move. The movement of the extrusion sleeve 36 squeezes the filter seat 33, thereby achieving the function of positioning the filter seat 33. By filtering the flue gas, the preheating efficiency can be improved, the damage to the heat exchange furnace body 2 can be reduced, the service life of the heat exchange furnace body 2 can be extended, and it is not easy to cause equipment failure. At the same time, it solves the problem of more frequent cleaning, maintenance or replacement of parts in traditional devices, which increases maintenance costs and workload, thereby reducing overall energy consumption.

[0037] Please refer to Figure 6 and Figure 7A disassembly mechanism 4 for facilitating the disassembly of the filter seat 33 is provided on one side of the heat exchange furnace body 2. The disassembly mechanism 4 includes a take-in and put-out port opened on one side of the heat exchange furnace body 2. A storage groove is provided on the top of the take-in and put-out port. A closing plate 41 corresponding to the take-in and put-out port is provided inside the storage groove. A sealing strip 42 is installed on the outer wall of the closing plate 41, and a control component for controlling the closing plate 41 is provided on the top of the closing plate 41. The control component includes two movable rods 43 fixed on the top of the closing plate 41. A frame 44 is fixed on the top of the heat exchange furnace body 2. The two movable rods 43 extend to the top of the frame 44 and are jointly installed with a control panel 45. A limiting component for limiting the two movable rods 43 is provided between the frame 44 and the two movable rods 43. The limiting assembly includes two fixing seats 46 fixed on the top of the frame body 44, a bidirectional screw 47 is rotatably installed between the two fixing seats 46, two threaded blocks 49 are screwed to the outer wall of the bidirectional screw 47, and a plug-in assembly for plugging two movable rods 43 is provided on one side of the two threaded blocks 49. The plug-in assembly includes a movable plate 411 fixed on one side of the threaded block 49, a positioning rod 48 is fixed on one side of the movable plate 411, and the positioning rod 48 is plugged with the movable rod 43. A linkage plate 410 is fixed on one side of the threaded block 49 relative to the movable plate 411, and protrusions are fixed on both sides of the bottom of the linkage plate 410. A fixing groove for sliding the linkage plate 410 is provided on the top of the frame body 44, and limiting grooves for sliding the protrusions are provided on both sides of the fixing groove;

[0038] The two-way screw 47 is rotated to drive the two threaded blocks 49 to move toward each other on their outer walls, and the movement of the two threaded blocks 49 drives the movable plate 411 to move, and the movement of the movable plate 411 drives the positioning rod 48 to move, and the positioning rod 48 is moved to separate it from the movable rod 43, and the movement of the threaded block 49 drives the linkage plate 410 to move synchronously, and the movement of the linkage plate 410 drives the two protrusions to move, so that the two protrusions slide in the limiting grooves, and the mutual cooperation between the two protrusions and the limiting grooves makes the threaded block 49 more stable during the movement, avoiding the situation that the two-way screw 47 drives the threaded block 49 to rotate, and after the mutual separation of the positioning rod 48 and the movable rod 43, the control plate 4 is pulled. 5 drives the two movable rods 43 to move, and the movement of the two movable rods 43 drives the closing plate 41 to move, and the movement of the closing plate 41 separates it from the access port. When the access port is in an open state, the filter seat 33 is pulled through the control groove 38 until it is separated from the heat exchange furnace body 2, so as to realize the function of disassembling the filter seat 33, which is convenient for replacement, and reduces the downtime caused by filter material blockage, thereby improving the operation efficiency and continuity of the equipment. Replacing the filter component can effectively prevent impurities from accumulating and corroding, protect the internal structure of the heat exchange furnace body 2, and further extend the service life of the equipment. At the same time, it is convenient for maintenance personnel to quickly locate the problem and make necessary repairs or replacements, which greatly improves the filtering efficiency of the device.

[0039] Please also refer to Figure 8 and Fig. 9 A sealing mechanism 5 for closing the heat exchange tube 6 is provided on one side of the heat exchange furnace body 2. The sealing mechanism 5 includes an extension seat 51 fixed on one side of the heat exchange furnace body 2. A groove cavity is provided between the heat exchange furnace body 2 and the extension seat 51. A sealing plate 56 matching the bottom of the heat exchange tube 6 is provided inside the groove cavity. Two support plates 53 are fixed on the top of the heat exchange furnace body 2 and the extension seat 51. A threaded rod 54 is rotatably installed between the two support plates 53. A fixed block 57 is fixed on one side of the extension seat 51. A driving motor 52 is installed on the top of the fixed block 57. The output end of the driving motor 52 is connected to the threaded rod 54. A moving block 55 is screwed on the outer wall of the threaded rod 54. A connecting plate 58 is connected between the moving block 55 and the sealing plate 56. An open groove for sliding the connecting plate 58 is provided on the top of the extension seat 51.

[0040] The threaded rod 54 is driven to rotate by the driving motor 52, and the rotation of the threaded rod 54 drives the moving block 55 to move on its outer wall, and the movement of the moving block 55 drives the connecting plate 58 to move, and the movement of the connecting plate 58 drives the sealing plate 56 to move synchronously, and the movement of the sealing plate 56 makes it cooperate with the bottom of the heat exchange tube 6, and the mutual cooperation between the sealing plate 56 and the bottom of the heat exchange tube 6 forms a barrier to the bottom of the heat exchange tube 6, so as to achieve the effect of sealing the inside of the heat exchange furnace body 2, effectively reduce the loss of heat, so that hot air will not easily escape and cold air cannot penetrate, ensure that the heat can be concentrated in the heat exchange furnace body 2, thereby improving the thermal efficiency, and by sealing the heat exchange furnace body 2, the stability of the inside of the heat exchange furnace body 2 can be maintained, and energy can be further saved.

[0041] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit thereof, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An energy-saving top-blown heat exchanger flue gas preheating boiler, characterized in that: include: A heat exchanger body (1), one side of the heat exchanger body (1) being connected to a heat exchange furnace body (2), the top of the heat exchange furnace body (2) being connected to a heat exchange tube (6), and a check valve (7) being installed inside the heat exchange furnace body (2); a filtering mechanism (3), the filtering mechanism (3) being located inside the heat exchange furnace body (2) and being used to filter the flue gas of the heat exchanger body (1), the filtering mechanism (3) comprising a layered filtering component, a preheating component and a positioning component, the layered filtering component being located inside the heat exchange furnace body (2) The preheating assembly is located at the bottom of the layered filtering assembly and is used to preheat the smoke; the positioning assembly is located between the heat exchange furnace body (2) and the layered filtering assembly and is used to position the layered filtering assembly; the preheating assembly comprises baffles (31) fixed to both sides of the interior of the heat exchange furnace body (2); a resistive heater (37) is arranged between the two baffles (31); the resistive heater (37) extends to one side of the heat exchange furnace body (2) and is provided with a temperature sensor. The layered filter assembly comprises a filter seat (33) mounted on the top of two baffle plates (31) and a filter hole (35) provided on the top of the filter seat (33); a first filter plate (310) and a second filter plate (311) corresponding to the filter hole (35) are installed inside the filter seat (33); a slider (39) is fixed to the bottom of the filter seat (33); a slide groove for the slider (39) to slide is provided on the top of the baffle plate (31); and a filter hole (35) is provided on one side of the filter seat (33). two control grooves (38); a disassembly mechanism (4) for facilitating disassembly of the filter seat (33) is provided on one side of the heat exchange furnace body (2); the disassembly mechanism (4) comprises a take-in / take-out port provided on one side of the heat exchange furnace body (2); a storage groove is provided on the top of the take-in / take-out port; a closing plate (41) corresponding to the take-in / take-out port is provided inside the storage groove; a sealing strip (42) is installed on the outer wall of the closing plate (41); and a control component for controlling the closing plate (41) is provided on the top of the closing plate (41);A sealing mechanism (5) for closing the heat exchange tube (6) is provided on one side of the heat exchange furnace body (2), the sealing mechanism (5) comprising an extension seat (51) fixed to one side of the heat exchange furnace body (2), a groove cavity is provided between the heat exchange furnace body (2) and the extension seat (51), a sealing plate (56) matching with the bottom of the heat exchange tube (6) is provided inside the groove cavity, two support plates (53) are fixed on the top of the heat exchange furnace body (2) and the extension seat (51), and one of the two support plates (53) is provided with a sealing plate (56) matching with the bottom of the heat exchange tube (6). A threaded rod (54) is rotatably mounted between the extension seat (51), a fixed block (57) is fixed on one side of the extension seat (51), a driving motor (52) is mounted on the top of the fixed block (57), an output end of the driving motor (52) is connected to the threaded rod (54), a moving block (55) is screwed on the outer wall of the threaded rod (54), a connecting plate (58) is connected between the moving block (55) and the sealing plate (56), and an open groove for the connecting plate (58) to slide is provided on the top of the extension seat (51). ; 2. The flue gas preheating boiler of the energy-saving top-blown heat exchanger according to claim 1 is characterized in that: The positioning assembly comprises a plurality of bolts (32) threadedly connected to the outer wall of the heat exchange furnace body (2); a linkage rod (312) is mounted on one side of the bolts (32); an extrusion sleeve (36) is rotatably mounted on one side of the linkage rod (312); the extrusion sleeve (36) corresponds to the outer wall of the filter seat (33).

3. The flue gas preheating boiler of the energy-saving top-blown heat exchanger according to claim 1 is characterized in that: The control assembly comprises two movable rods (43) fixed on the top of the closing plate (41); a frame (44) is fixed on the top of the heat exchange furnace body (2); the two movable rods (43) extend to the top of the frame (44) and are jointly equipped with a control panel (45); and a limiting assembly for limiting the two movable rods (43) is provided between the frame (44) and the two movable rods (43).

4. The flue gas preheating boiler of the energy-saving top-blown heat exchanger according to claim 3 is characterized in that: The limit assembly comprises two fixing seats (46) fixed on the top of the frame (44), a bidirectional screw (47) is rotatably mounted between the two fixing seats (46), two threaded blocks (49) are screwed to the outer wall of the bidirectional screw (47), and a plug-in assembly for plugging two movable rods (43) is provided on one side of the two threaded blocks (49).

5. The flue gas preheating boiler of the energy-saving top-blown heat exchanger according to claim 4 is characterized in that: The plug-in assembly comprises a movable plate (411) fixed to one side of the threaded block (49), a positioning rod (48) being fixed to one side of the movable plate (411), and the positioning rod (48) being plugged into the movable rod (43).

6. The flue gas preheating boiler of the energy-saving top-blown heat exchanger according to claim 5 is characterized in that: A linkage plate (410) is fixed to one side of the threaded block (49) relative to the movable plate (411), protrusions are fixed to both sides of the bottom of the linkage plate (410), a fixing groove for the linkage plate (410) to slide is formed at the top of the frame (44), and limiting grooves for the protrusions to slide are formed on both sides of the fixing groove.

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