Deflectible burner for wall-type cut-circle boilers

Abstract

A deflectable burner for a wall-like, cross-sectional boiler, characterized in that it comprises a number of burner nozzles (20), wherein the number of burner nozzles (20) are provided on each of the four walls (10) of the combustion chamber and the burner nozzles (20) are connected to a deflection arrangement; wherein the deflection arrangement comprises a servomotor (31), wherein the servomotor (31) is connected to a screw (37), wherein a solid rod (38) is mounted outside the screw (37), wherein the solid rod (38) is provided with a threaded groove (39) which is screwed to the screw (37), and wherein the solid rod (38) is connected to the burner nozzles (20).

Description

TECHNICAL FIELD

[0001] The present invention relates to the field of burners, in particular to a deflectable burner for wall-type sectional boilers. STATE OF THE ART

[0002] The wall-type cut-circle boiler is a pulverized coal boiler typically used in supercritical or ultra-supercritical plants. Its design features burners arranged on all four walls of the combustion chamber to optimize the pulverized coal combustion process by forming a cut-circle combustion pattern. Cut-circle combustion can effectively improve combustion efficiency, reduce the emission of harmful gases, and contribute to a uniform airflow distribution in the combustion chamber. Each layer of burners typically corresponds to a coal mill, improving the boiler's thermal efficiency by injecting finely pulverized coal and making the fuel and air more homogeneous.In the course of efficient and stable combustion, the temperature distribution in the combustion chamber is effectively controlled, so that areas with too high or too low temperature are avoided, thereby improving the operational stability of the boiler.

[0003] In wall-type sectional-circle boilers, the design and arrangement of the burners are very important. Typically, multiple burners are used, operating in parallel to ensure uniform airflow and temperature in the combustion chamber. The position and direction of the burner nozzles have an important influence on the combustion effect. Therefore, the use of a deflection mechanism is very important. The deflection mechanism mainly serves to adjust the angle of the burner nozzle to change the direction of the mixed airflow of ejected pulverized coal and air, thus improving the airflow distribution in the combustion chamber and avoiding the problems of dead space and uneven temperature. Through this adjustment, the burner can be flexibly adapted to different working conditions, improving the combustion efficiency and thermal performance of the boiler.

[0004] However, the deflection mechanisms currently used in many wall-type sectional-circle boilers have certain limitations in actual operation. Typically, the position and angle of these deflections are fixed, so they cannot be adjusted in real time according to the combustion state in the combustion chamber. Once the adjustment of the deflection mechanism no longer meets actual needs, the stability and efficiency of combustion are often affected. For example, when the load on the boiler changes, the airflow distribution in the combustion chamber may no longer be uniform. If the deflection mechanism cannot be adjusted in time, localized, too fast, or too slow combustion may occur, thereby affecting the combustion efficiency and heat efficiency of the entire boiler.Since the position of the deflection mechanism is difficult to adjust according to the state of the art, it cannot respond flexibly to the requirements of changing operating conditions, which limits the adaptability of the boiler to some extent. CONTENTS OF THE PRESENT UTILITY MODEL

[0005] The purpose of the present invention is to overcome the defect that it is difficult to change the position of the deflection mechanism according to the actual need, and to provide a burner for wall-type sectional boilers and its working method.

[0006] To achieve the above purpose, the present invention uses the following technical solutions: In a first aspect, the present invention provides a burner for wall-type sectional-circle boilers comprising a number of burner nozzles, the number of burner nozzles being provided on the four walls of the combustion chamber, respectively, and the burner nozzles being connected to a deflection arrangement; The deflection assembly comprises a servo motor, wherein the servo motor is connected to a screw, wherein a solid rod is mounted outside the screw, wherein the solid rod is provided with a threaded groove which is screwed to the screw, and wherein the solid rod is connected to the burner nozzles. A further improvement of the present invention is that the output shaft of the servo motor is connected to a first flexible shaft, a square hole is provided in the first flexible shaft, a second flexible shaft is slidably connected to the square hole, and the second flexible shaft is connected to the screw.

[0007] A further improvement of the present invention is that the screw is rotatably connected to the first mounting plate via a bearing.

[0008] A further improvement of the present invention is that the output shaft of the servo motor is connected to the first flexible shaft via the first connection arrangement; wherein the first connection assembly comprises a second connection plate, wherein the output shaft of the servo motor is fixedly mounted on the second connection plate, wherein the first flexible shaft is fixed to a second square plate on the underside, and wherein the second square plate is provided with a second recess, wherein the second connection plate is fixed to a second projection block on one side, wherein the second projection block is inserted into the second recess, wherein the second square plate is provided with a receiving groove, wherein the receiving groove is connected to the second recess, and wherein a second fixing plate is provided in the receiving groove, wherein the second fixing plate is slidably connected to a slide rod, wherein both ends of the second projection block are provided with limiting grooves,wherein one end of the slide rod is inserted into the limiting grooves and the other end of the slide rod is fixed to a drive plate, wherein a spring is placed on the slide rod, wherein the two ends of the spring are firmly connected to the drive plate and the second fixing plate, respectively.

[0009] A further improvement of the present invention is that the drive plate is provided with a movable plate on one side, and a fixing block is fixedly mounted on both ends of one side of the second square plate, a bolt is screwed to the fixing block, one end of the bolt is rotatably connected to the movable plate via a bearing, two sets of bolts are fixedly mounted with second telescopic rods at opposite ends, and both ends of the second telescopic rods are fixedly provided with round rods.

[0010] A further improvement of the present invention is that the second flexible shaft is connected to the screw by a second connecting arrangement; wherein the second connection assembly comprises a first connection plate, the first connection plate being provided at one end of the screw, a first square plate being provided at one end of the second flexible shaft, the first square plate being provided with a first recess, the first connection plate being provided with a first projection block on one side, the first projection block being inserted into the first recess, both ends of the first square plate being fixedly mounted to two sets of side plates, the side plates being rotatably connected to a rotary shaft via a bearing, and a movable rod being provided between the two sets of rotary shafts, a torsion spring being mounted on the rotary shaft, the two ends of the torsion spring being respectively fixedly connected to the movable rod and the side plates,wherein the movable rod is provided at one end with a first telescopic rod, and wherein a support plate is provided at one end of the first telescopic rod.,

[0011] A further improvement of the present invention is that a positioning rod is rotatably connected to one side of the support plate, the positioning rod is slidably connected to the side wall of the first square plate, positioning grooves are provided at both ends of the first projection block, and one end of the positioning rod is inserted into the positioning groove.

[0012] In a second aspect, the present invention provides a working method for the deflectable burner for wall-type sectional boilers, comprising the following steps: The servo motor is started after receiving the command from the control system; The servo motor rotates to drive the screw in its axial direction;

[0013] When the screw rotates, the solid rod placed outside the screw moves linearly along the axial direction of the screw;

[0014] The linear displacement of the solid rod directly drives the angle change of the burner nozzle, thereby changing the angle of the nozzle and the injection direction.

[0015] A further improvement of the present invention is that when the output shaft of the servo motor is connected to the first flexible shaft via the first connecting structure, the pin is caused to rotate by the round rod to allow the two sets of movable plates to drive the drive plate backward until the slide rod is located in the receiving groove and the second projection block is inserted into the second recess; and that when the slide rod and the limiting groove are aligned, the round rod is reversed so that the slide rod is inserted into the limiting groove.

[0016] A further improvement of the present invention is that when the second flexible shaft is connected to the screw by the second connecting arrangement, the movable rod is compressed and the torsion spring is compressed until the positioning rod is located in the first square plate, and the first projection block is inserted into the first recess, and when the positioning rod and the positioning groove are aligned with each other, the positioning rod is inserted into the positioning groove by the action of the torsion spring, so that the second flexible shaft is connected to the screw.

[0017] Compared to the prior art, the present invention has the following advantageous effects: The present invention is capable of precise angle adjustment because the deflection assembly is driven by a servo motor, a screw, and a solid rod. This allows the burner nozzle to adjust its direction in real time as needed to optimize the distribution of the combustion gas flow in the combustion chamber. This flexible adjustment capability contributes to improving combustion efficiency, particularly under changing boiler loads or different fuel conditions. By precisely adjusting the nozzle deflection angle, the present invention can evenly distribute the combustion gas flow in the combustion chamber and reduce the phenomenon of incomplete combustion.The direction of the burner nozzle can be dynamically adjusted to different operating conditions, allowing for better adaptation to different loads and fuel requirements, ultimately improving the overall combustion efficiency of the boiler. The adjustable deflection angle of the present invention allows the burner nozzle to be adjusted according to the temperature distribution in the combustion chamber, effectively avoiding areas with excessively high or low temperatures and optimizing the thermal efficiency of the combustion chamber. By controlling the direction of the combustion air flow, the temperature distribution in the combustion chamber can be made more uniform, reducing heat loss and improving overall thermal efficiency.The present invention's ability to precisely control the combustion process helps optimize the fuel-oxygen mixture ratio, making the combustion process more complete. By adjusting the nozzle direction, excessive or incomplete combustion in some areas can be avoided, thereby reducing the emission of carbon monoxide, nitrogen oxides, and other pollutants in accordance with environmental requirements. The present invention allows the system to dynamically adjust the nozzle deflection angle to the specific needs of the boiler due to the cooperation between the servomotor and the deflection assembly. This flexibility allows the boiler to operate under various operating conditions, adapt to load changes or different fuel types, and even maintain efficient and stable operation under some special operating conditions.The present invention is capable of maintaining a long service life in high-temperature and high-pressure operating environments because the mechanical transmission is achieved through screws and solid rods, a construction that is typically more robust and durable. Furthermore, the high precision and stability of the servomotor control ensures that the device can operate stably over a long period of time, reducing breakdowns and maintenance costs. The present invention can adapt to the different combustion characteristics of various fuels (such as natural gas, coal, biomass, etc.), and by adjusting the deflection angle of the burner nozzle, it can be adjusted according to the combustion characteristics of different fuels to achieve optimal combustion results.In summary, the present invention offers the advantages of flexible and precise adjustment of the burner nozzle angle, which allows the direction of the combustion air flow to be dynamically adjusted according to actual operating requirements, significantly improves combustion efficiency, optimizes temperature distribution, reduces emissions, adapts to different operating conditions, and improves the reliability and ease of use of the system. These positive effects combine to improve the overall performance of the boiler and its adaptability to the environment, and overcome the shortcomings of the conventional boiler system, which is difficult to adapt to the needs of the operating process in real time. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a schematic diagram showing the distribution of burner nozzles in the present invention; Fig. Figure 2 shows a schematic representation of the deflection arrangement of the present invention in front view; Fig. Figure 3 is an enlarged schematic representation of the structure at A in Fig. 2 of the present invention; Fig. Figure 4 is an enlarged schematic representation of the structure at B in Fig. 2 of the present invention; Fig. 5 is a schematic plan view of the first connecting assembly of the present invention; Fig. 6 is a schematic plan view of the local structure of the second connecting assembly of the present invention; 10. four walls of the combustion chamber; 20. burner nozzle; 30. box; 31. servo motor; 32. first flexible shaft; 33.

[0018] Square hole; 34. Second flexible shaft; 35. Screws; 36. First mounting plate; 37. Screw; 38. Solid rod; 39. Thread groove; 40. First fixing plate; 41. First square plate; 42. First recess; 43. First projection block; 44. Side plate; 45. Rotating shaft; 46. Movable rod; 47. Torsion spring; 48. First telescopic rod; 49. Support plate; 491. Positioning rod; 492. Positioning groove; 50. Second connecting plate; 51. Second square plate; 52. Second recess; 53. second projection block; 54. receiving groove; 55. second fixing plate; 56. sliding rod; 57. limit groove; 58. driving plate; 59. spring; 591. movable plate; 592. fixing block; 593. bolt; 594. second telescopic rod; 595. round rod. DETAILED DESCRIPTION

[0019] Only certain exemplary embodiments are briefly described below. As those skilled in the art will appreciate, the described embodiments may be modified in many ways without departing from the spirit or scope of the present invention. Accordingly, the accompanying drawings and description are to be considered essentially as illustrative and not restrictive.

[0020] In the description of the present application, it is to be understood that the terms, e.g. "center", "longitudinal", "transverse", "length", "width", "thickness", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "above", "below", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the attached drawings, are used only for convenience and to simplify the description of the present application and do not indicate or imply that the device or element referred to has a particular orientation or must be constructed and operated with a particular orientation and are therefore not to be construed as limiting the present application.

[0021] The term "first" or "second" feature in the description and claims of this application may explicitly or implicitly encompass one or more such features. Consequently, a feature defined as "first" or "second" may include one or more of these features, either explicitly or implicitly. In the description of this application, unless otherwise stated, "plurality" means two or more. Embodiment 1

[0022] In the Fig. 1 to 2 is a deflectable burner for wall-type sectional circular boilers, comprising a number of burner nozzles (20), the number of burner nozzles (20) being provided on the four walls (10) of the combustion chamber, respectively, and the burner nozzles (20) being connected to a deflection arrangement;

[0023] The deflection arrangement comprises a servo motor (31), wherein the servo motor (31) is connected to a screw (37), wherein a solid rod (38) is placed outside the screw (37), wherein the solid rod (38) is provided with a threaded groove (39) which is screwed to the screw (37), and wherein the solid rod (38) is connected to the burner nozzles (20). Embodiment 2

[0024] In the Fig. 1 to 2 is a working procedure for the deflectable burner for wall-type sectional boilers, which includes the following steps: S1: Servo motor 31 is activated when it receives a command from the control system. Servo motor 31 is typically an electric motor that can precisely control the angle and speed of rotation. S2: The servo motor 31 is connected to the screw 37 via a shaft. When the servo motor 31 rotates, it drives the screw 37 to rotate in its axial direction. S3: The screw 37 has a threaded structure. When the screw 37 rotates, the solid rod 38, which is mounted on the screw, moves linearly along the axial direction of the screw 37. Since the rotation of the screw 37 drives the solid rod to retract or retract, the linear displacement of the solid rod is a direct result of the rotation of the screw. The thread fit between the solid rod 38 and the screw 37 enables the rotation of the screw 37 to be precisely converted into a linear movement of the solid rod 38. S4: The solid rod 38 is connected to the burner nozzle 20 by a mechanical connection. The linear displacement of the solid rod 38 directly leads to an angle change in the burner nozzle 20. The movement of the solid rod 38 causes the burner nozzle 20 to be deflected in a specific direction, whereby the exact deflection angle depends on the angle of rotation of the screw and the pitch of the thread. S5: When the solid rod 38 moves, the burner nozzle 20 is deflected, changing the angle and injection direction of the burner nozzle 20. The deflection angle of the burner nozzle 20 determines the distribution of the fuel-air mixture flow in the combustion chamber.

[0025] The servo motor 31 of this embodiment is generally equipped with a position sensor and a feedback control system capable of monitoring the position of the burner nozzle 20, along with the position of the solid rod 38 and the angle of the burner nozzle 20, in real time. The control system adjusts the control instructions according to real-time data such as the temperature and pressure in the combustion chamber to ensure that the deflection angle of the burner nozzle and the combustion state of the combustion chamber meet the specified working requirements. In this way, the servo motor makes fine adjustments according to the feedback signal to ensure the stability and efficiency of the combustion process. Through this transmission process, the deflection angle of the burner nozzle 20 is precisely controlled, thereby achieving effective adjustment of the combustion air flow and the temperature distribution in the combustion chamber.This is of great importance for improving the combustion efficiency of the boiler, reducing emissions and optimizing the combustion process.

[0026] The transmission process of this embodiment is based on a servo motor, which drives the linear movement of the solid rod through the rotation of the screw, which in turn adjusts the deflection angle of the burner nozzle. The entire process relies on the synergistic work of the mechanical transmission and the servo control system, which can precisely adjust the position of the burner nozzle and optimize the boiler's combustion process. Embodiment 3

[0027] As in Fig. 2, the deflection arrangement comprises a servo motor 31.The servo motor 31 is fixedly installed in the box 30, the output shaft of the servo motor 31 is detachably connected to the first flexible shaft 32 via the first connecting structure, the square hole 33 is opened in the first flexible shaft 32, the second flexible shaft 34 is slidably connected to the square hole 33, and the screw 37 is rotatably connected to the first fixing plate 36 via a bearing, and one end of the second flexible shaft 34 is detachably connected to the screw 37 via the second connecting structure, a solid rod 38 is rotatably connected to one side of the burner nozzle 20, a threaded groove 39 is opened in the solid rod 38, and the screw 37 is threadedly connected to the threaded groove 39, and the screw 35 is threadedly connected to the upper side wall of the first flexible shaft 32, and one end of the screw 35 is in close contact with the second flexible shaft 34.

[0028] During use, the first mounting plate 36 and the box 30 are first fixed in a suitable position. Then, the screw 37 can be rotated by the servo motor 31, the first flexible shaft 32, and the second flexible shaft 34. When the screw 37 is rotated, the burner nozzle 20 can be compressed to rotate the burner nozzle 20 counterclockwise and achieve deflection. Embodiment 4

[0029] As in the Fig. 2, Fig. 4 and Fig. 5, the output shaft of the servo motor 31 is connected to the first flexible shaft 32 via a first connecting assembly, the first connecting assembly comprising a second connecting plate 50, the output shaft of the servo motor 31 is fixedly mounted to the second connecting plate 50, and the second square plate 51 is fixedly mounted to the bottom of the first flexible shaft 32. A second recess 52 is opened in the second square plate 51, a second projection block 53 is fixedly attached to one side of the second connecting plate 50, and the second projection block 53 is inserted into the second recess 52. Receiving grooves 54 are opened on the second square plate 51, which are located on both sides of the second recess 52, and the receiving grooves 54 are connected to the second recess 52. A second fixing plate 55 is fixedly mounted in the receiving grooves 54.and a slide rod 56 is slidably connected to the second fixing plate 55. Both ends of the second projection block 53 are fixedly connected to the limit grooves 57, and one end of the slide rod 56 is inserted into the limit grooves 57. The drive plate 58 is fixedly mounted on the other end of the slide rod 56, the spring 59 is fitted on the slide rod 56, and both ends of the spring 59 are fixedly connected to the drive plate 58 and the second fixing plate 55, respectively. The movable plate 591 is fixedly attached to one side of the drive plate 58, and the fixing block 592 is fixedly mounted to both ends of one side of the second square plate 51. The bolts 593 are threadedly connected to the fixing block 592, and one end of the bolts 593 is rotatably connected to the movable plate 591 via a bearing. A second telescopic rod 594 is fixedly mounted at the opposite ends of the two sets of bolts 593,and a second telescopic rod 594 is fixedly mounted at both ends of the round rod 595, and the second telescopic rod 594 is preferably the telescopic rod in patent CN203939829U.,

[0030] In use, the round rod 595 is used to rotate the bolt 593, so that the two sets of movable plates 591 drive the drive plate 58 to move backward until the slide rod 56 is located in the receiving groove 54, after which the second projection block 53 is inserted into the second recess 52, and when the slide rod 56 and the limit groove 57 are aligned with each other, the round rod 595 can be reversed so that the slide rod 56 is inserted into the limit groove 57; Up to this point, the servo motor 31 and the first flexible shaft 32 can be connected together, with the spring 59 in a deformed state to reinforce the position of the slide rod 56 to a certain extent. Embodiment 5

[0031] As in the Fig. 2, Fig. 3 and Fig.6, the second flexible shaft 34 is connected to the screw 37 via a second connection assembly, the second connection assembly including a first connection plate 40, and the first connection plate 40 is fixedly mounted to one end of the screw 37; a first square plate 41 is fixedly mounted to one end of the second flexible shaft 34, a first recess 42 is opened in the first square plate 41, a first projection block 43 is fixedly mounted to one side of the first connection plate 40, and the first projection block 43 is inserted into the first recess 42, and two sets of side plates 44 are fixedly mounted to both ends of the first square plate 41;A rotary shaft 45 is rotatably connected to the side plates 44 by means of a bearing. A movable rod 46 is fixedly mounted between the two sets of rotary shafts 45. A torsion spring 47 is supported on the rotary shaft 45, and both ends of the torsion spring 47 are fixedly connected to the movable rod 46 and the side plates 44, respectively. A first telescopic rod 48 is fixedly mounted to one end of the movable rod 46, and a support plate 49 is fixedly mounted to one end of the first telescopic rod 48. A positioning rod 491 is rotatably connected to one side of the support plate 49, and the positioning rod 491 is slidably connected to a side wall of the first square plate 41. Positioning grooves 492 are provided at both ends of the first projection block 43, and one end of the positioning rod 491 is inserted into the positioning grooves 492.

[0032] In use, the movable rod 46 is compressed, deforming the torsion spring 47 until the positioning rod 491 is located in the first square plate 41, after which the first projection block 43 is inserted into the first recess 42; when the positioning rod 491 and the positioning groove 492 are aligned, the positioning rod 491 can be inserted into the positioning groove 492 under the action of the torsion spring 47, so that the second flexible shaft 34 and the screw 37 can be connected to each other.

[0033] Although the present invention has been described above with reference to the embodiments, various improvements may be made and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the disclosed embodiments of the present invention may be used in any combination with each other, and the omission of an exhaustive description of these combinations in the present specification is merely for the sake of saving space and resources. Therefore, the present invention is not limited to the particular embodiments disclosed in the text, but includes all technical solutions that fall within the scope of the claims. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] CN 203939829

[0029]

Claims

[1] Deflectable burner for wall-type cutting circle boiler, characterized by in that it comprises a number of burner nozzles (20), wherein the number of burner nozzles (20) are each provided on the four walls (10) of the combustion chamber and the burner nozzles (20) are connected to a deflection arrangement; wherein the deflection arrangement comprises a servomotor (31), wherein the servomotor (31) is connected to a screw (37), wherein a solid rod (38) is placed outside the screw (37), wherein the solid rod (38) is provided with a threaded groove (39) which is screwed to the screw (37), and wherein the solid rod (38) is connected to the burner nozzles (20). [2] Deflectable burner for wall-type cut-circle boiler according to claim 1, characterized byin that the output shaft of the servo motor (31) is connected to a first flexible shaft (32), wherein a square hole (33) is provided in the first flexible shaft (32), wherein a second flexible shaft (34) is slidably connected to the square hole (33) and the second flexible shaft (34) is connected to the screw (37). [3] Deflectable burner for wall-type cut-circle boiler according to claim 2, characterized by that the screw (37) is rotatably connected to the first fastening plate (36) via a bearing. [4] Deflectable burner for wall-type cut-circle boiler according to claim 2, characterized bythat the output shaft of the servo motor (31) is connected to the first flexible shaft (32) via the first connection arrangement; wherein the first connection arrangement comprises a second connection plate (50), wherein the output shaft of the servo motor (31) is fixedly mounted on the second connection plate (50), wherein the first flexible shaft (32) is fastened to a second square plate (51) on the underside, and wherein the second square plate (51) is provided with a second recess (52), wherein the second connection plate (50) is fastened to a second projection block (53) on one side, wherein the second projection block (53) is inserted into the second recess (52), wherein the second square plate (51) is provided with a receiving groove (54), wherein the receiving groove (54) is connected to the second recess (52), and wherein a second fastening plate (55) is provided in the receiving groove (54),wherein the second fixing plate (55) is slidably connected to a slide rod (56), wherein both ends of the second projection block (53) are provided with limiting grooves (57), wherein one end of the slide rod (56) is inserted into the limiting grooves (57) and the other end of the slide rod (56) is fixed to a drive plate (58), wherein a spring (59) is placed on the slide rod (56), wherein the two ends of the spring (59) are fixedly connected to the drive plate (58) and the second fixing plate (55), respectively. [5] Deflectable burner for wall-type cut-circle boiler according to claim 4, characterized bythat the drive plate (58) is provided on one side with a movable plate (591) and a fixing block (592) is fixedly mounted at both ends of one side of the second square plate (51), wherein a bolt (593) is screwed to the fixing block (592), wherein one end of the bolt (593) is rotatably connected to the movable plate (591) via a bearing, wherein two sets of bolts (593) are fixedly mounted with second telescopic rods (594) at opposite ends and both ends of the second telescopic rods (594) are fixedly provided with round rods (595). [6] Deflectable burner for wall-type cut-circle boiler according to claim 2, characterized bythat the second flexible shaft (34) is connected to the screw (37) by a second connecting arrangement; wherein the second connecting arrangement comprises a first connecting plate (40), wherein the first connecting plate (40) is provided at one end of the screw (37), wherein a first square plate (41) is provided at one end of the second flexible shaft (34), wherein the first square plate (41) is provided with a first recess (42), wherein the first connecting plate (40) is provided with a first projection block (43) on one side, wherein the first projection block (43) is inserted into the first recess (42), wherein both ends of the first square plate (41) are fixedly mounted with two sets of side plates (44), wherein the side plates (44) are rotatably connected to a rotary shaft (45) via a bearing, and wherein a movable rod (46) is provided between the two sets of rotary shafts (45),wherein a torsion spring (47) is mounted on the rotary shaft (45), wherein the two ends of the torsion spring (47) are each fixedly connected to the movable rod (46) and the side plates (44), wherein the movable rod (46) is provided at one end with a first telescopic rod (48), and wherein a support plate (49) is provided at one end of the first telescopic rod (48). [7] Deflectable burner for wall-type cut-circle boiler according to claim 6, characterized by that a positioning rod (491) is rotatably connected to one side of the support plate (49), wherein the positioning rod (491) is slidably connected to the side wall of the first square plate (41), wherein positioning grooves (492) are provided at both ends of the first projection block (43), and wherein one end of the positioning rod (491) is inserted into the positioning groove (492).

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