Soot blowing system of air pre-heater

Abstract

The invention discloses an air pre-heater soot blowing system which comprises a laser signal transmitter and a laser signal receiver which are arranged on the two opposite sides in the axial direction of a rotating shaft of an air pre-heater respectively, and laser signals transmitted by the laser signal transmitter are transmitted to the laser signal receiver through an air bin of the air pre-heater; the position sensor is used for measuring the rotating angle of the air pre-heater from the reference position; the soot blowing device is arranged along the radial direction of the air preheater and is used for blowing the air bin; the processing device is used for controlling soot blowing; when the laser signal is blocked due to blockage of the air bin, the laser signal receiver transmits a blockage signal to the processing device, and the processing device correspondingly starts the soot blowing device according to the rotation angle of the air pre-heater after receiving the blockage signal. The soot blowing system of the air pre-heater can accurately blow the blocked area of the air pre-heater, so that the influence of accumulated soot on the performance of a boiler is improved, and the service life of the air pre-heater can be prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of air preheaters, in particular to an air preheater soot blowing system. Background Art

[0002] An air preheater is a preheating device that improves the boiler's heat exchange performance and reduces heat loss. The air preheater transfers the heat carried by the flue gas discharged from the boiler's tail flue through the heat sink to the air entering the boiler, preheating the air to a certain temperature.

[0003] Air preheater sootblowing primarily involves removing the accumulated soot from the air preheater to maintain unobstructed exhaust. Currently, a typical steam sootblowing method utilizes hydraulic sootblowing, which is effective for heat exchange components such as air preheaters. However, operating a steam sootblower with water can damage the air preheater and affect its heat transfer efficiency. Another method, steam sootblowing, increases the water vapor content in the exhaust gas, making the heating surfaces of the tail flue more susceptible to soot accumulation and corrosion, and sometimes increases the frequency of boiler shutdowns for water flushing.

[0004] Currently, thermal power plants are more often faced with uneven soot blowing in air preheaters, which may lead to a series of adverse consequences.

[0005] To ensure the normal operation and safety of the boiler, the air preheater must be sootblown regularly and evenly. At the same time, the sootblower must be regularly inspected and maintained to promptly identify and resolve any problems. The above methods can only address uneven air preheater sootblowing from a management perspective, resulting in low sootblowing accuracy. Summary of the Invention

[0006] The main purpose of the present invention is to provide an air preheater soot blowing system, aiming to improve the soot blowing accuracy of the air preheater and save energy.

[0007] To achieve the above object, the present invention proposes an air preheater soot blowing system, which comprises:

[0008] The laser signal transmitter and the laser signal receiver are respectively arranged on opposite sides of the rotating shaft of the air preheater in the axial direction. The laser signal emitted by the laser signal transmitter is transmitted to the laser signal receiver through the air bin of the air preheater.

[0009] A position sensor is used to measure the rotation angle of the air preheater from the reference position;

[0010] The soot blowing device is arranged along the radial direction of the air preheater and is used to blow the air bin;

[0011] a processing device for controlling sootblowing;

[0012] Among them, when the laser signal is blocked due to blockage in the wind bin, the laser signal receiver transmits the blockage signal to the processing device. After receiving the blockage signal, the processing device starts the soot blowing device according to the rotation angle of the air preheater.

[0013] Furthermore, the start-up time of the sootblowing device T3 = {A3-(A2-A1)} / S, wherein A3 represents the rotation angle of the air preheater from the laser signal transmitter to the sootblowing device, A2 represents the rotation angle of the air preheater from the reference position during the duration of the blockage signal, A1 represents the rotation angle of the air preheater from the reference position before the processing device receives the blockage signal, and S represents the rotation angle of the air preheater per unit time.

[0014] Furthermore, the working time of the sootblowing device is T2-T1, wherein T2 is the end time of the blockage signal, T2=A2 / S, and T1 is the start time of the blockage signal, T1=A1 / S. After the working time, the processing device shuts down the sootblowing device.

[0015] Furthermore, the position sensor is a magnetic switch, which is installed on the bearing side of the air preheater rotating motor.

[0016] Furthermore, the sootblowing device can move relative to the air preheater along the radial direction of the air preheater.

[0017] The air preheater sootblowing system of the present invention can accurately blow soot and improve sootblowing efficiency. By accurately blowing soot from the air preheater, it can more effectively remove accumulated soot and dirt, maintain its heat exchange efficiency, reduce the impact of soot accumulation on boiler performance, and extend the service life of the air preheater.

[0018] Secondly, precise sootblowing helps reduce operating costs. By reducing unnecessary sootblowing times and lowering sootblowing intensity, energy is saved and wear is reduced, thereby reducing maintenance costs.

[0019] Furthermore, precise sootblowing can improve boiler safety. By promptly removing accumulated dust and dirt from the air preheater surface, equipment failures and safety incidents caused by excessive soot accumulation can be avoided, ensuring safe and stable boiler operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the structure of the air preheater soot blowing system according to an embodiment of the present invention.

[0021] Description of Figure Numbers:

[0022] Laser signal transmitter 110; laser signal receiver 120; wind silo 130; position sensor 200; sootblowing device 300; processing device 400.

[0023] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0024] The following will be combined with the accompanying drawings to clearly and completely describe the 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 making any creative efforts are within the scope of protection of the present invention.

[0025] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, top, bottom, side, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0026] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element.

[0027] In addition, the descriptions involving "first", "second", etc. in the embodiments of the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features.

[0028] In view of the technical defects existing in the related art, this embodiment provides an air preheater soot blowing system. Figure 1 As shown, the air preheater sootblowing system of this embodiment includes a laser signal transmitter 110 , a laser signal receiver 120 , a position sensor 200 , a sootblowing device 300 and a processing device 400 .

[0029] Among them, the laser signal transmitter 110 and the laser signal receiver 120 are respectively arranged on opposite sides of the axial direction of the rotating shaft of the air preheater. The laser signal emitted by the laser signal transmitter 110 is transmitted to the laser signal receiver 120 through the air silo 130 of the air preheater. Specifically, when the laser signal emitted by the laser signal transmitter 110 passes through the dust-free area of the air silo 130, it can be normally transmitted to the laser signal receiver 120. Therefore, the laser signal receiver 120 can receive the laser signal when there is no dust accumulation in the air silo 130. The soot blowing device 300 is arranged along the radial direction of the air preheater and is used to blow the air silo 130, and the processing device 400 is used to control the soot blowing. Specifically, when the air silo 130 is blocked by dust accumulation, the laser signal is blocked by the blocked area of the air silo, so that the laser signal receiver 120 cannot receive the laser signal.

[0030] At this point, the laser signal receiver 120 transmits a blockage signal to the processing device 400. The position sensor 200 measures the rotation angle of the air preheater from the reference position. Upon receiving the blockage signal, the processing device 400 activates the sootblowing device 300 based on the rotation angle of the air preheater to purge the air silo 130.

[0031] Specifically, in order to accurately purge the blocked area of the air bin 130, the start-up time T3 of the sootblowing device 300 should be set. The start-up time T3 of the sootblowing device 300 = {A3-(A2-A1)} / S. Among them, A3 represents the rotation angle of the air preheater from the laser signal transmitter 110 to the sootblowing device 300. For example, A3 is 90°, which means that in the rotation circumference of the air preheater, the angle between the laser signal transmitter 110 and the sootblowing device 300 is 90°. Of course, the laser signal transmitter 110 and the sootblowing device 300 can also be arranged close to each other according to actual needs. A2 represents the angle at which the air preheater rotates from the reference position during the duration of the blockage signal. A1 represents the angle at which the air preheater rotates from the reference position before the processing device 400 receives the blockage signal. S represents the rotation angle of the air preheater per unit time, such as 5° / second. By setting the start-up time of the sootblowing device 300, the blocked area of the air bin 130 can be accurately purged, thereby eliminating the need to purge the air bin 130 for a long time, thereby saving energy.

[0032] Furthermore, to further improve the accuracy of purging, the operating time of the sootblower 300 should be precisely controlled to purge only the blocked areas of the air silo 130. The operating time of the sootblower 300 is T2-T1. T2 is the end time of the blockage signal, T2 = A2 / S. T1 is the start time of the blockage signal, T1 = A1 / S. After the operating time has expired, the processing device 400 shuts down the sootblower 300, thereby saving energy.

[0033] Optionally, the position sensor 200 of this embodiment may be a magnetic switch, which is installed on the bearing side of the air preheater rotating motor to measure the angle of rotation of the air preheater from a reference position.

[0034] Furthermore, the sootblower 300 can move relative to the air preheater in the radial direction. This allows the sootblower 300 to be positioned outside the air preheater when the air silo 130 does not need to be purged. When the air preheater air silo 130 needs to be purged, the sootblower 300 moves radially into the air preheater. The timing of the sootblower 300's activation should also take into account the time it takes to enter the air preheater.

[0035] In summary, compared with related technologies, the air preheater sootblowing system of this embodiment can accurately blow soot and improve sootblowing efficiency. By accurately blowing soot from the air preheater, it can more effectively remove accumulated dust and dirt, maintain its heat exchange efficiency, reduce the impact of soot accumulation on boiler performance, and extend the service life of the air preheater.

[0036] Secondly, precise sootblowing helps reduce operating costs. By reducing unnecessary sootblowing times and lowering sootblowing intensity, energy is saved and wear is reduced, thereby reducing maintenance costs.

[0037] Furthermore, precise sootblowing can improve boiler safety. By promptly removing accumulated dust and dirt from the air preheater surface, equipment failures and safety incidents caused by excessive soot accumulation can be avoided, ensuring safe and stable boiler operation.

[0038] The above description is only a partial or preferred embodiment of the present invention. Neither the text nor the drawings can limit the scope of protection of the present invention. Any equivalent structural transformation made by using the contents of the present invention specification and drawings under the overall concept of the present invention, or direct / indirect application in other related technical fields, is included in the scope of protection of the present invention.

Claims

1. An air preheater sootblowing system, characterized in that: include: A laser signal transmitter and a laser signal receiver are respectively arranged on opposite sides of the rotating shaft of the air preheater in the axial direction, and the laser signal emitted by the laser signal transmitter is transmitted to the laser signal receiver through the air bin of the air preheater; A position sensor, used for measuring the rotation angle of the air preheater from a reference position; A soot blowing device is arranged along the radial direction of the air preheater and is used to blow the air bin; a processing device for controlling said sootblowing; When the laser signal is blocked due to blockage of the wind silo, the laser signal receiver transmits a blockage signal to the processing device. After receiving the blockage signal, the processing device starts the soot blowing device according to the rotation angle of the air preheater.

2. The air preheater soot blowing system according to claim 1, characterized in that: The starting time T3 of the sootblowing device is {A3-(A2-A1)} / S, wherein A3 represents the rotation angle of the air preheater from the laser signal transmitter to the sootblowing device, A2 represents the rotation angle of the air preheater from the reference position during the duration of the blockage signal, A1 represents the rotation angle of the air preheater from the reference position before the processing device receives the blockage signal, and S represents the rotation angle of the air preheater per unit time.

3. The air preheater sootblowing system according to claim 2, characterized in that: The working time of the sootblowing device is T2-T1, wherein T2 is the end time of the blocking signal, T2=A2 / S, and T1 is the start time of the blocking signal, T1=A1 / S. After the working time, the processing device turns off the sootblowing device.

4. The air preheater sootblowing system according to any one of claims 1 to 3, characterized in that: The position sensor is a magnetic switch, which is installed on the bearing side of the air preheater rotating motor.

5. The air preheater sootblowing system according to claim 4, characterized in that: The sootblowing device can move relative to the air preheater along the radial direction of the air preheater.

Images