Air preheater fault processing method and system

Abstract

The invention relates to the technical field of air preheater fault processing, in particular to an air preheater fault processing method and system, and the method comprises the steps: isolating a fault air preheater through reducing the load of a unit; an adjustable cutter is installed on the innermost ring of an air preheater rotor, and a center cylinder static seal winding drum is turned; by utilizing the rotation of the rotor of the air preheater, the adjustable cutter is used for carrying out annular cutting turning on the collision and grinding part; the turning process is adaptively adjusted through remote real-time monitoring. The method has the beneficial effects that by means of reducing the unit load and isolating the faulted air preheater, the problem of the sealing gap of the center cylinder is solved on line without shutdown, and frequent start and stop of the whole unit are successfully avoided. And meanwhile, the collision and abrasion part of the static sealing winding drum of the center cylinder is annularly cut through the tool frame, the risk of operation jamming caused by the fact that the dynamic and static gap is reduced due to sinking of a boiler truss is eliminated, and it is ensured that the air preheater stably operates under the adjusted sealing gap.

Description

Technical Field

[0001] The invention relates to the technical field of air preheater fault processing, and in particular to an air preheater fault processing method and system. Background Art

[0002] The air preheater is a heat exchange device that uses the heat of the flue gas at the tail of the boiler to heat the combustion air. The air is heated and the flue gas is cooled, thereby reducing the exhaust gas temperature, improving the boiler efficiency, and facilitating the ignition and combustion of the fuel. The air preheater consists of thousands of high-efficiency heat transfer elements tightly placed in a model fan-shaped bin. Multiple fan-shaped bins form a rotor. A rotor shell is installed outside the rotor. The two ends of the rotor shell are connected to the cold and hot end connecting plates. The cold and hot end connecting plates are connected to the smoke and air ducts, forming a half of the preheater flowing with flue gas and the other half flowing with air. When the rotor rotates slowly, the flue gas and air flow alternately through the heat transfer elements. The heat transfer elements absorb heat from the hot flue gas, and then this part of the heat transfer elements is flushed by the air flow and releases the stored heat. In order to avoid air leakage during the operation of the air preheater, sealing devices are designed for the rotating part and the fixed part of the air preheater. The sealing device is divided into radial seal, axial seal, annular seal and center tube seal.

[0003] When the truss of the air preheater sinks and the center tube seal is insufficient, it will cause friction on both the air side and the flue gas side. Since the adjustment of the truss requires a major modification of the boiler structure, it needs to be carried out during the maintenance period. The only way to solve the friction problem is to adjust the center tube sealing structure to eliminate the friction. To adjust the center tube sealing structure, it is necessary to enter the center tube inside the faulty air preheater from the flue gas side and the air side to process the center tube seal. Under normal conditions, the unit must be shut down and the processing must be carried out after all fans are shut down. Summary of the invention

[0004] In view of the above problems or problems existing in the prior art, the present invention is proposed.

[0005] Therefore, the object of the present invention is to provide an air preheater fault handling method, which can solve the problem that the truss at the air preheater sinks, resulting in a reduction in the dynamic and static sealing gaps of the air preheater center tube and the risk of operation jamming.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a method for handling air preheater faults, comprising isolating the faulty air preheater by reducing the unit load;

[0007] The static seal roll of the center barrel is turned by installing an adjustable cutter on the innermost ring of the air preheater rotor;

[0008] The air preheater rotor is rotated to enable the adjustable tool to perform circular turning on the grinding part;

[0009] Through remote real-time monitoring, adaptive adjustments can be made to the turning process.

[0010] As a preferred solution of the method for handling air preheater faults of the present invention, the unit load includes reducing the temperature and pressure of the flue gas and air flow inside the air preheater.

[0011] As a preferred solution of the air preheater fault handling method of the present invention, wherein: isolating the air preheater includes closing the damper plates on the flue gas side and the air side connected to the faulty air preheater by utilizing the pressure difference between the flue gas side and the air side of the unit, thereby preventing the flue gas and air from continuing to flow through the faulty equipment, and isolating the faulty air preheater.

[0012] As a preferred solution of the air preheater fault processing method of the present invention, the adjustable tool can adjust the tool feed as needed after each rotation of the air preheater rotor so that the rubbed part is gradually removed.

[0013] As a preferred solution of the air preheater fault handling method of the present invention, remote monitoring includes real-time monitoring of the operation process and tool status, and real-time adjustment of the tool position and feed amount through the remote monitoring screen.

[0014] In order to solve the above technical problems, the present invention also provides the following technical solutions: an air preheater fault handling system, comprising a fault handling unit, including a sealing component, and a fault handling component arranged outside the sealing component;

[0015] The control unit includes a monitoring module connected to the fault processing component, a control module connected to the monitoring module, and a feedback module connected to both the control module and the fault processing module.

[0016] As a preferred solution of the air preheater fault handling system of the present invention, the sealing assembly includes an air preheater rotor and a central tube static sealing reel connected to the air preheater rotor.

[0017] As a preferred solution of the air preheater fault handling system of the present invention, wherein: the fault handling component includes a cutter arranged outside the static sealing reel of the central tube, a base arranged outside the cutter, a cutter holder fixedly connected to the air preheater rotor, and a bolt arranged on one side of the cutter;

[0018] The tool is fixedly connected to the tool holder through the base.

[0019] As a preferred solution of the air preheater fault handling system of the present invention, the monitoring module includes a camera; the control module includes a remote monitoring device; and the feedback module includes a servo motor driver.

[0020] As a preferred solution of the air preheater fault handling system of the present invention, wherein: the bolt is arranged on the rear side of the base, the feedback module is connected to the bolt, and the bolt is accurately pushed into the tool by remotely controlling the feedback module.

[0021] Beneficial effects of the present invention: The present invention achieves the problem of the sealing gap of the center tube online without stopping the machine by reducing the load of the unit and isolating the faulty air preheater, successfully avoiding the frequent start and stop of the entire unit and reducing the life loss of the boiler and steam turbine equipment. At the same time, the tool is set up to perform circumcision on the rubbing part of the static sealing reel of the center tube, eliminating the risk of operation jamming caused by the reduction of the dynamic and static gap caused by the sinking of the boiler truss, ensuring the stable operation of the air preheater under the adjusted sealing gap, and avoiding equipment failure and shutdown due to jamming. Through remote monitoring and precise control of the tool position, the safety of operation is improved and the need for personnel to enter high-risk areas is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0023] Figure 1 The figure is a flow chart of the air preheater troubleshooting method.

[0024] Figure 2 This is a schematic diagram of the overall structural cross-section of the air preheater of the air preheater fault handling system.

[0025] Figure 3 This is a schematic diagram of the local structural cross-section of the fault handling unit of the air preheater fault handling system.

[0026] Figure 4 The invention is an implementation method of an air preheater fault processing system. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0028] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0030] Example 1

[0031] Reference Figure 1 , is an embodiment of the present invention, which provides an air preheater fault handling method, which can solve the problem that the truss at the air preheater sinks, resulting in a reduction in the dynamic and static sealing gaps of the air preheater center tube, and the risk of operation jamming.

[0032] Specifically, the faulty air preheater is isolated by reducing the unit load;

[0033] The static seal roll of the center barrel is turned by installing an adjustable cutter on the innermost ring of the air preheater rotor;

[0034] The air preheater rotor is rotated to enable the adjustable tool to perform circular turning on the grinding part;

[0035] Through remote real-time monitoring, adaptive adjustments can be made to the turning process.

[0036] Further, the unit load includes reducing the temperature and pressure of the flue gas and air flow inside the air preheater.

[0037] Furthermore, isolating the air preheater includes closing the damper plates on the flue gas side and the air side connected to the faulty air preheater by utilizing the pressure difference between the flue gas side and the air side of the unit to prevent the flue gas and air from continuing to flow through the faulty equipment, thereby isolating the faulty air preheater, wherein, under the action of the induced draft fan, the flue gas side is in a negative pressure state; and under the action of the forced draft fan and the primary fan, the air side is in a positive pressure state.

[0038] It should be noted that the unit load needs to be reduced to below 50%. This can reduce the operating pressure and temperature of the air preheater, creating safer and easier-to-operate conditions for subsequent isolation and maintenance work.

[0039] Furthermore, the adjustable cutter can adjust the cutter feed as required after each rotation of the air preheater rotor, so that the abraded part is gradually removed.

[0040] It should be noted that the setting of the adjustable tool is to turn the static seal reel of the center tube without stopping the machine. This method requires welding a channel steel on the innermost ring of the air preheater rotor and opening a hole in the channel steel as a fixed structure for the tool. This structure is called a tool holder. An adjustable tool is installed on the tool holder. The tool can control its radial in and out through bolts, thereby achieving precise turning of the static seal reel of the center tube. After each rotation of the rotor, the tool can be advanced 0.10mm by rotating the adjustment bolt, and the rubbing part can be gradually removed until the problem is solved.

[0041] Furthermore, remote monitoring includes real-time monitoring of the operation process and tool status, and real-time adjustment of the tool position and feed amount through the remote monitoring screen.

[0042] In summary, the present invention controls the restart button remotely or locally, and the operation and maintenance personnel can freely choose whether to go to the site to restart according to the location of the power station, which greatly reduces labor costs and time consumption. At the same time, by simplifying the restart process, the wear of the equipment caused by frequent manual restart is reduced, and the life of the equipment is extended. In addition, through the quick-response restart mechanism, the risk of power supply interruption is reduced, the continuity of the system and the user's power experience are improved, and a strong guarantee is provided for the stable operation of the power system.

[0043] Example 2

[0044] Example 2 Reference Figure 2~Figure 4 , which is the second embodiment of the present invention, provides an air preheater fault handling system, which can solve the problem that the truss at the air preheater sinks, resulting in a reduction in the dynamic and static sealing gaps of the air preheater center tube, and the risk of operation jamming.

[0045] Specifically, the fault handling unit 100 includes a sealing component 101 and a fault handling component 102 disposed outside the sealing component 101;

[0046] The control unit 200 includes a monitoring module 201 connected to the fault handling component 102 , a control module 202 connected to the monitoring module 201 , and a feedback module 203 connected to both the control module 202 and the fault handling module.

[0047] Furthermore, the sealing assembly 101 includes an air preheater rotor 101a and a central tube static sealing reel 101b connected to the air preheater rotor 101a.

[0048] Further, the fault handling assembly 102 includes a cutter 102a disposed outside the central cylinder static seal reel 101b, a base 102b disposed outside the cutter 102a, a cutter holder 102c fixedly connected to the air preheater rotor 101a, and a bolt 102d disposed on one side of the cutter 102a;

[0049] The tool 102a is fixedly connected to the tool holder 102c via the base 102b.

[0050] Furthermore, the monitoring module 201 includes a camera 201a; the control module 202 includes a remote monitoring device 202a; and the feedback module 203 includes a servo motor driver 203a.

[0051] Furthermore, the bolt 102d is disposed at the rear side of the base 102b, and the feedback module 203 is connected to the bolt 102d. By remotely controlling the feedback module 203, the bolt 102d is precisely pushed into the tool 102a.

[0052] During use, when troubleshooting is performed, the staff controls the load of the unit to be reduced to less than 50% to isolate the faulty air preheater. At this time, the rotation of the air preheater rotor 101a drives the tool holder 102c to rotate synchronously in the same direction, and the tool holder 102c drives the tool 102a to rotate synchronously in the same direction through the base 102b. At this time, the staff controls the bolt 102d to rotate accurately through the feedback module 203 according to the image transmitted from the monitoring module 201 to the control module 202, so that the bolt 102d pushes the tool 102a and the base 102b. 02b moves to the cutting position, at this time, the tool 102a follows the rotation of the rotor to perform circular cutting along the outer wall of the center tube static sealing reel 101b. When the rotor rotates one circle, the staff adjusts the bolt 102d through the feedback module 203 to control the tool 102a to advance 0.10mm to the side close to the center tube static sealing reel 101b, so that the tool 102a further cuts the center tube static sealing reel 101b, and so on. The center tube static sealing reel 101b is gradually cut until the friction part is completely removed to eliminate the risk of dynamic and static jamming.

[0053] When the fault handling is completed, the staff controls the bolt 102d through the feedback module 203 to drive the tool 102a to withdraw to the initial position. At the same time, the air preheater rotor 101a continues to rotate. At this time, the center tube static sealing reel 101b that is free from friction rotates together with the rotor center axis to maintain sealing contact with the boiler truss, ensuring the sealing of the air preheater and preventing cross leakage of flue gas and air, thereby restoring the stable operation and heat exchange efficiency of the air preheater.

[0054] In summary, the present invention achieves the problem of the sealing gap of the central tube without stopping the machine by reducing the load of the unit and isolating the faulty air preheater, successfully avoiding the frequent start and stop of the entire unit and reducing the life loss of the boiler and steam turbine equipment. At the same time, the tool 102a is set up to perform circumcision on the rubbing part of the static sealing reel 101b of the central tube, thereby eliminating the risk of operation jamming caused by the reduction of the dynamic and static gaps caused by the sinking of the boiler truss, ensuring that the air preheater operates stably under the adjusted sealing gap, and avoiding equipment failure and shutdown due to jamming. By remotely monitoring and precisely controlling the position of the tool 102a, the safety of operation is improved and the need for personnel to enter high-risk areas is reduced.

[0055] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible without substantially departing from the novel teachings and advantages of the subject matter described in the application (e.g., mounting arrangements, use of materials, color, changes in orientation, etc.). For example, the element shown as integrally formed may be composed of a plurality of parts or elements, the position of the element may be inverted or otherwise changed, and the nature or number or position of the discrete element may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to an alternative embodiment. In the claims, any "bracket plus function" clause is intended to cover the structure of the execution function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the present invention is not limited to a specific embodiment, but extends to a variety of modifications that still fall within the scope of the appended claims.

[0056] Additionally, in an effort to provide a concise description of example embodiments, all features of an actual implementation may not be described.

[0057] It should be understood that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but for those of ordinary skill having the benefit of this disclosure, the development effort will be a routine task of design, fabrication, and production without undue experimentation.

[0058] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for handling air preheater faults, characterized in that: include, Isolate the faulty air preheater by reducing the unit load; The static seal roll of the center cylinder is turned by installing an adjustable cutter on the innermost ring of the air preheater rotor; The air preheater rotor is rotated to enable the adjustable tool to perform circular turning on the grinding part; Through remote real-time monitoring, adaptive adjustments can be made to the turning process.

2. The air preheater fault handling method according to claim 1, characterized in that: The unit load includes reducing the temperature and pressure of the flue gas and air flow inside the air preheater.

3. The air preheater fault processing method according to claim 2, characterized in that: The isolating air preheater includes closing the dampers on the flue gas side and the air side connected to the faulty air preheater by utilizing the pressure difference between the flue gas side and the air side of the unit, thereby preventing the flue gas and air from continuing to flow through the faulty equipment and isolating the faulty air preheater.

4. The air preheater fault handling method according to claim 3, characterized in that: The adjustable cutter adjusts the cutter feed as required after each rotation of the air preheater rotor, so that the abraded part is gradually removed.

5. The air preheater fault processing method according to claim 4, characterized in that: The remote monitoring includes real-time monitoring of the operation process and the tool status, and real-time adjustment of the tool position and feed amount through the remote monitoring screen.

6. An air preheater fault handling system, applicable to an air preheater fault handling method, characterized in that: include, A fault handling unit (100) comprises a sealing component (101) and a fault handling component (102) arranged outside the sealing component (101); The control unit (200) comprises a monitoring module (201) connected to the fault processing component (102), a control module (202) connected to the monitoring module (201), and a feedback module (203) connected to both the control module (202) and the fault processing module.

7. The air preheater fault handling system according to claim 6, characterized in that: The sealing assembly (101) comprises an air preheater rotor (101a) and a central tube static sealing reel (101b) connected to the air preheater rotor (101a).

8. The air preheater fault handling system according to claim 7, characterized in that: The fault handling assembly (102) comprises a cutter (102a) arranged outside the central tube static sealing reel (101b), a base (102b) arranged outside the cutter (102a), a cutter holder (102c) fixedly connected to the air preheater rotor (101a), and a bolt (102d) arranged on one side of the cutter (102a); The tool (102a) is fixedly connected to the tool holder (102c) via the base (102b).

9. The air preheater fault processing system according to any one of claims 6 to 8, characterized in that: The monitoring module (201) comprises a camera (201a); the control module (202) comprises a remote monitoring device (202a); and the feedback module (203) comprises a servo motor driver (203a).

10. The air preheater fault processing system according to claim 9, characterized in that: The bolt (102d) is arranged on the rear side of the base (102b), and the feedback module (203) is connected to the bolt (102d). By remotely controlling the feedback module (203), the bolt (102d) is precisely pushed into the tool (102a).

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