A boiler steam soot blowing control method and system

Abstract

The present application discloses a boiler steam sootblowing control method, which is applied with a vibrator and a vibration sensor. The method comprises: vibrating the boiler by the vibrator, and collecting the vibration characteristic data of the boiler in real time by the vibration sensor; determining the distribution of ash accumulation and the thickness of ash accumulation based on the vibration characteristic data, and driving the sootblowing gun to blow the ash accumulation according to the distribution of ash accumulation and the thickness of ash accumulation. The present application discloses a boiler steam sootblowing control method and system, which comprises a plurality of vibrators, a plurality of vibration sensors, a sootblowing gun and an analysis and processing module. The analysis and processing module determines the distribution of ash accumulation and the thickness of ash accumulation based on the vibration characteristic data, and drives the sootblowing gun to blow the ash accumulation according to the distribution of ash accumulation and the thickness of ash accumulation, which not only reduces energy consumption and improves the sootblowing effect, but also avoids the problem of overblowing on the heating surface of the boiler and reduces damage to the heating surface.

Description

Technical Field

[0001] The invention relates to the technical field of power plant boiler maintenance, and in particular to a boiler steam soot blowing control method and system. Background Art

[0002] A boiler refers to a medium-to-large boiler in a power plant that provides a specified quantity and quality of steam to the steam turbine. It is one of the main thermal equipment in a thermal power plant and is often matched with a steam turbine generator set of a certain capacity. It is mainly used for power generation, but in some cases it can also be used for external heat supply.

[0003] When the boiler is in operation for a long time, ash and coke will accumulate on the heating surface, which will deteriorate the heat transfer. For the tail flue, due to the long-term accumulation of combustibles, re-combustion accidents may occur. Therefore, after the boiler has been in operation for a period of time, it is necessary to blow off the ash on the heating surface to clean it.

[0004] In the prior art, the soot blowing method adopted is steam soot blowing. During the soot blowing process, steam or drain is directly discharged to the drain expansion tank, which has the disadvantages of loud noise and heat waste. In addition, due to the lack of effective monitoring of the ash thickness on the boiler heating surface, excessive soot blowing or insufficient soot blowing is prone to occur, which will cause damage to the boiler heating surface in the long run. Summary of the invention

[0005] The object of the present invention is to provide a method and system which can effectively monitor the heating surface of a boiler and perform targeted soot blowing according to the distribution and thickness of ash accumulation, so as to reduce energy consumption and damage to the heating surface.

[0006] Therefore, the present invention discloses a boiler steam soot blowing control method, which uses a vibrator and a vibration sensor, and the method includes:

[0007] The boiler is vibrated by a vibrator, and vibration characteristic data of the boiler is collected in real time by the vibration sensor;

[0008] Based on the vibration characteristic data, the distribution of the dust accumulation and the thickness of the dust accumulation are determined, and the soot blowing gun is driven to blow the dust accumulation according to the distribution of the dust accumulation and the thickness of the dust accumulation.

[0009] In some embodiments of the present application, in order to determine the location of dust accumulation, the method is improved, and the method for determining the distribution of dust accumulation includes:

[0010] Evenly arrange a plurality of the vibrators and vibration sensors on the outside of the boiler;

[0011] While driving the vibrator to vibrate, the vibration characteristic data collected by the vibration sensor is obtained, and the ash accumulation distribution on the heating surface of the boiler is determined according to the vibration characteristic data and the corresponding arrangement of the vibration sensor.

[0012] In some embodiments of the present application, in order to enable the sootblowing gun to perform targeted sootblowing on the soot accumulation thickness and avoid excessive sootblowing on the heating surface of the boiler, a method for determining the soot accumulation thickness is provided. The method for determining the soot accumulation thickness includes:

[0013] According to the relationship between the vibration characteristic data and the dust accumulation thickness, a dust accumulation thickness comparison table is preset;

[0014] Vibration characteristic data is acquired through the vibration sensor, and the dust accumulation thickness corresponding to the vibration characteristic data is determined according to the dust accumulation thickness comparison table.

[0015] In some embodiments of the present application, the types of the vibration characteristic data are disclosed, and the vibration characteristic data includes vibration amplitude and vibration frequency.

[0016] In some embodiments of the present application, in order to facilitate determination of the thickness of dust accumulation on the heating surface, a method for presetting the dust accumulation thickness comparison table is disclosed. The method for presetting the dust accumulation thickness comparison table includes:

[0017] Acquire a first vibration characteristic of a heating surface without dust accumulation and a second vibration characteristic of a heating surface with dust accumulation, and determine a vibration characteristic difference value between the first vibration characteristic and the second vibration characteristic;

[0018] The vibration characteristic difference value is made to correspond to the dust thickness of the corresponding heated surface.

[0019] The present application discloses a boiler steam soot blowing control method, which drives the boiler to vibrate through a vibrator, and uses a vibration sensor to judge the distribution and thickness of soot on the heating surface of the boiler based on the vibration characteristic data of the boiler monitored, and then controls the soot blowing gun to perform targeted soot blowing on the accumulated soot.

[0020] A boiler steam soot blowing control system, comprising:

[0021] a plurality of vibrators, arranged on the boiler, for vibrating the boiler;

[0022] A plurality of vibration sensors are arranged outside the boiler and used to monitor vibration characteristic data of the boiler;

[0023] Soot blowing gun, used to guide steam to blow the accumulated soot on the heating surface;

[0024] An analysis and processing module, used to control the operation of the vibrator and acquire and analyze the vibration characteristic data collected by the vibration sensor;

[0025] The analysis and processing module determines the distribution of the dust accumulation and the thickness of the dust accumulation based on the vibration characteristic data, and drives the soot blowing gun to blow the dust accumulation according to the distribution of the dust accumulation and the thickness of the dust accumulation.

[0026] In some embodiments of the present application, in order to determine the distribution of dust accumulation, a method for determining the distribution of dust accumulation is disclosed. The method for determining the distribution of dust accumulation includes:

[0027] The analysis and processing module determines the distribution of ash accumulation on the heating surface of the boiler according to the vibration characteristic data and the corresponding arrangement of the vibration sensors, so that the sootblowing gun can be directed to the ash accumulation on the heating surface.

[0028] In some embodiments of the present application, in order to enable a sootblowing gun to perform sootblowing operations on soot deposits of different thicknesses in a targeted manner, a method for determining the thickness of soot deposits is disclosed. The method for determining the thickness of soot deposits includes:

[0029] According to the relationship between the vibration characteristic data and the dust accumulation thickness, a dust accumulation thickness comparison table is preset;

[0030] The analysis and processing module determines the dust accumulation thickness corresponding to the vibration characteristic data according to the dust accumulation thickness comparison table.

[0031] In some embodiments of the present application, in order to enable the system to find the dust accumulation thickness value corresponding to a certain vibration characteristic data, a method for presetting a dust accumulation thickness comparison table is disclosed. The method for presetting the dust accumulation thickness comparison table includes:

[0032] Determining a vibration characteristic difference value between the first vibration characteristic and the second vibration characteristic according to a first vibration characteristic of the heating surface without dust accumulation and a second vibration characteristic of the heating surface with dust accumulation collected by the vibration collection module;

[0033] The vibration characteristic difference value is made to correspond to the dust thickness of the corresponding heated surface.

[0034] In some embodiments of the present application, the vibration characteristic difference value is a vibration frequency difference or a vibration amplitude difference.

[0035] The present application discloses a boiler steam soot blowing control system, which drives the boiler to vibrate through a vibrator. The analysis and processing module determines the distribution and thickness of soot on the heating surface of the boiler based on the monitored vibration characteristic data of the boiler, and then controls the soot blowing gun to blow the accumulated soot in a targeted manner.

[0036] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a flow chart of the steps of the method for constructing a boiler steam sootblowing control system in an embodiment of the present application. DETAILED DESCRIPTION

[0038] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0039] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0040] Example:

[0041] A boiler refers to a medium-to-large boiler in a power plant that provides a specified quantity and quality of steam to the steam turbine. It is one of the main thermal equipment in a thermal power plant and is often matched with a steam turbine generator set of a certain capacity. It is mainly used for power generation, but in some cases it can also be used for external heat supply.

[0042] When the boiler is in long-term operation, ash and coking will occur on the heating surface, which will deteriorate the heat transfer. For the tail flue, due to the long-term accumulation of combustibles, reburning accidents will occur. Therefore, after the boiler has been running for a period of time, it is necessary to blow the heating surface to keep the heating surface clean. Because the thermal conductivity of ash is very small, ash accumulation on the heating surface of the boiler affects the heat transfer of the heating surface, the temperature of the heat-absorbing medium decreases, and the exhaust temperature increases, thereby reducing the thermal efficiency of the boiler; when the ash accumulation is serious, the flue gas flow cross-sectional area is reduced, the flow resistance is increased, the power consumption of the induced draft fan is increased, the boiler operation load is reduced, and even the boiler is forced to stop; due to ash accumulation, the rear flue gas temperature increases, affecting the safe operation of the tail heating surface. If the local ash accumulation is serious, it is possible to form a "flue gas corridor", which will increase the wear of the local heating surface due to the increase in flue gas velocity. Therefore, the boiler heating surface should be blown regularly.

[0043] In the prior art, the soot blowing method adopted is steam soot blowing. During the soot blowing process, steam or drain is directly discharged to the drain expansion tank, which has the disadvantages of loud noise and heat waste. In addition, due to the lack of effective monitoring of the ash thickness on the boiler heating surface, excessive soot blowing or insufficient soot blowing is prone to occur, which will cause damage to the boiler heating surface in the long run.

[0044] The present invention discloses a boiler steam soot blowing control method, which uses a vibrator and a vibration sensor, and the method comprises:

[0045] Step 1: Vibrate the boiler by using a vibrator, and collect vibration characteristic data of the boiler in real time by using the vibration sensor.

[0046] Step 2: Based on the vibration characteristic data, determine the distribution of dust accumulation and the thickness of dust accumulation, and drive the soot blowing gun to blow the dust accumulation according to the distribution of dust accumulation and the thickness of dust accumulation.

[0047] In some embodiments of the present application, in order to determine the location of dust accumulation, the method for determining the distribution of dust accumulation in step 2 is disclosed. The method for determining the distribution of dust accumulation includes:

[0048] Step 3:

[0049] A plurality of the vibrators and vibration sensors are evenly arranged outside the boiler.

[0050] While driving the vibrator to vibrate, the vibration characteristic data collected by the vibration sensor is obtained, and the ash accumulation distribution on the heating surface of the boiler is determined according to the vibration characteristic data and the corresponding arrangement of the vibration sensor.

[0051] In some embodiments of the present application, in order to enable the sootblowing gun to perform targeted sootblowing on the soot accumulation thickness and avoid excessive sootblowing on the heating surface of the boiler, a method for determining the soot accumulation thickness is provided, that is, the method for determining the soot accumulation thickness in step 2. The method for determining the soot accumulation thickness includes:

[0052] Step 4: Preset a dust accumulation thickness comparison table based on the relationship between the vibration characteristic data and the dust accumulation thickness.

[0053] Vibration characteristic data is acquired through the vibration sensor, and the dust accumulation thickness corresponding to the vibration characteristic data is determined according to the dust accumulation thickness comparison table.

[0054] In some embodiments of the present application, the types of the vibration characteristic data are disclosed, and the vibration characteristic data includes vibration amplitude and vibration frequency.

[0055] In some embodiments of the present application, in order to facilitate determination of the thickness of dust accumulation on the heating surface, a method for presetting the dust accumulation thickness comparison table in step 4 is disclosed, and the method for presetting the dust accumulation thickness comparison table includes:

[0056] Step 5:

[0057] Obtain a first vibration characteristic of a heating surface without dust accumulation and a second vibration characteristic of a heating surface with dust accumulation, and determine a vibration characteristic difference value between the first vibration characteristic and the second vibration characteristic:.

[0058] The vibration characteristic difference value is made to correspond to the dust thickness of the corresponding heated surface.

[0059] The present application discloses a boiler steam soot blowing control method, which drives the boiler to vibrate through a vibrator, and uses a vibration sensor to judge the distribution and thickness of soot on the heating surface of the boiler based on the vibration characteristic data of the boiler monitored, and then controls the soot blowing gun to perform targeted soot blowing on the accumulated soot.

[0060] In order to further illustrate the technical solution of the present application, the technical solution of the present application is now explained through a specific application scenario.

[0061] It is now necessary to carry out soot blowing on the inner wall of the power plant boiler. The conventional soot blowing method is to guide the steam in the mother pipe into the boiler, and use a soot blowing gun to blow the soot accumulated on the heating surface. Since the soot blowing consumes a lot of energy and excessive steam blowing on the heating surface will cause damage to the heating surface of the boiler, a steam soot blowing control system is needed that can carry out targeted soot blowing on the soot condition of the heating surface.

[0062] See also Figure 1 The steps of constructing the above steam soot blowing control system method include:

[0063] S1. Arrange a vibrator and several vibration sensors on the side of the boiler;

[0064] S2, driving the vibrator to vibrate, and collecting vibration characteristic data by the vibration sensor;

[0065] S3. Determine the distribution of ash accumulation on the heating surface of the boiler according to the vibration characteristic data and the corresponding arrangement of the vibration sensors.

[0066] S4. Preset a dust accumulation thickness comparison table based on the relationship between the vibration characteristic data and the dust accumulation thickness.

[0067] S5. Acquire vibration characteristic data through the vibration sensor, and determine the dust accumulation thickness corresponding to the vibration characteristic data according to the dust accumulation thickness comparison table.

[0068] S6. Adjust the soot blowing angle of the soot blowing gun according to the distribution of soot accumulation on the heating surface, and determine the soot blowing intensity and time of the soot blowing gun according to the thickness of the soot accumulation.

[0069] Among them, in step S1, the vibrator is arranged at a fixed position of the boiler, and the vibration frequency of the vibrator should be fixed. The vibration sensor can be evenly arranged on the outside of the boiler, specifically, it can be divided into multiple areas relative to the heating surface of the boiler, and the vibration sensor is arranged at the center position of different areas.

[0070] In step S4, the method for presetting the dust accumulation thickness comparison table may be: dividing the dust accumulation thickness into several thickness values, identifying vibration characteristic data for different thickness values, so as to form a one-to-one correspondence between the dust accumulation thickness value and the vibration characteristic data.

[0071] In some embodiments of the present application, a boiler steam sootblowing control system is also disclosed. The system includes a plurality of vibrators, a plurality of vibration sensors, a sootblowing gun, and an analysis and processing module.

[0072] The plurality of vibrators are arranged on the boiler and are used to vibrate the boiler.

[0073] The plurality of vibration sensors are arranged outside the boiler and are used to monitor vibration characteristic data of the boiler.

[0074] The soot blowing gun is used to guide the steam to blow the soot accumulated on the heating surface.

[0075] The analysis and processing module is used to control the operation of the vibrator and obtain and analyze the vibration characteristic data collected by the vibration sensor.

[0076] The analysis and processing module determines the distribution of the dust accumulation and the thickness of the dust accumulation based on the vibration characteristic data, and drives the soot blowing gun to blow the dust accumulation according to the distribution of the dust accumulation and the thickness of the dust accumulation.

[0077] In some embodiments of the present application, in order to determine the distribution of dust accumulation, a method for determining the distribution of dust accumulation is disclosed. The method for determining the distribution of dust accumulation includes:

[0078] The analysis and processing module determines the distribution of ash accumulation on the heating surface of the boiler according to the vibration characteristic data and the corresponding arrangement of the vibration sensors, so that the sootblowing gun can be directed to the ash accumulation on the heating surface.

[0079] In some embodiments of the present application, in order to enable a sootblowing gun to perform sootblowing operations on soot deposits of different thicknesses in a targeted manner, a method for determining the thickness of soot deposits is disclosed. The method for determining the thickness of soot deposits includes:

[0080] According to the relationship between the vibration characteristic data and the dust accumulation thickness, a dust accumulation thickness comparison table is preset.

[0081] The analysis and processing module determines the dust accumulation thickness corresponding to the vibration characteristic data according to the dust accumulation thickness comparison table.

[0082] In some embodiments of the present application, in order to enable the system to find the dust accumulation thickness value corresponding to a certain vibration characteristic data, a method for presetting a dust accumulation thickness comparison table is disclosed. The method for presetting the dust accumulation thickness comparison table includes:

[0083] According to the first vibration characteristic of the heating surface without dust accumulation and the second vibration characteristic of the heating surface with dust accumulation collected by the vibration collection module, a vibration characteristic difference value between the first vibration characteristic and the second vibration characteristic is determined.

[0084] The vibration characteristic difference value is made to correspond to the dust thickness of the corresponding heated surface.

[0085] In some embodiments of the present application, the vibration characteristic difference value is a vibration frequency difference or a vibration amplitude difference.

[0086] The technical solution disclosed in the present application has the following inventive concept:

[0087] Invention concept 1: Different dust accumulation conditions inside the boiler have different vibration characteristics, and the dust accumulation conditions inside the boiler are judged based on the different vibration characteristics.

[0088] Inventive concept 2: By evenly arranging a number of vibration sensors on the side of the boiler, the distribution of ash accumulation inside the boiler can be monitored. The more vibration sensors are arranged, the more accurate the judgment of the distribution of ash accumulation can be.

[0089] Invention concept three: By presetting the ash accumulation thickness comparison table, the thickness of the ash accumulation at a certain position inside the boiler can be accurately monitored, which facilitates the control of the soot blowing gun to perform soot blowing operations on the ash accumulation.

[0090] Inventive concept four: The method for presetting the dust accumulation thickness comparison table is to obtain the first vibration characteristic of the heating surface without dust accumulation and the second vibration characteristic of the heating surface with dust accumulation, and determine the vibration characteristic difference value between the first vibration characteristic and the second vibration characteristic; correspond the vibration characteristic difference value to the corresponding dust thickness of the heating surface.

[0091] The present application discloses a boiler steam soot blowing control system, which drives the boiler to vibrate through a vibrator. The analysis and processing module determines the distribution and thickness of soot on the heating surface of the boiler based on the monitored vibration characteristic data of the boiler, and then controls the soot blowing gun to blow the accumulated soot in a targeted manner.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution 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 they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A boiler steam sootblowing control method, characterized in that: A vibrator and a vibration sensor are used, and the method includes: The boiler is vibrated by a vibrator, and vibration characteristic data of the boiler is collected in real time by the vibration sensor; Based on the vibration characteristic data, determine the distribution of dust accumulation and the thickness of dust accumulation, and drive the soot blowing gun to blow the dust accumulation according to the distribution of dust accumulation and the thickness of dust accumulation; Determining the distribution of dust accumulation includes: Evenly arrange a plurality of the vibrators and vibration sensors on the outside of the boiler; While driving the vibrator to vibrate, the vibration characteristic data collected by the vibration sensor is obtained, and the distribution of ash accumulation on the heating surface of the boiler is determined according to the vibration characteristic data and the corresponding arrangement of the vibration sensor; The method for determining the dust accumulation thickness comprises: According to the relationship between the vibration characteristic data and the dust accumulation thickness, a dust accumulation thickness comparison table is preset; Vibration characteristic data is acquired through the vibration sensor, and the dust accumulation thickness corresponding to the vibration characteristic data is determined according to the dust accumulation thickness comparison table.

2. A boiler steam sootblowing control method according to claim 1, characterized in that: The vibration characteristic data includes vibration amplitude and vibration frequency.

3. A boiler steam sootblowing control method according to claim 1, characterized in that: The method of presetting the dust accumulation thickness comparison table includes: Acquire a first vibration characteristic of a heating surface without dust accumulation and a second vibration characteristic of a heating surface with dust accumulation, and determine a vibration characteristic difference value between the first vibration characteristic and the second vibration characteristic; The vibration characteristic difference value is made to correspond to the dust thickness of the corresponding heated surface.

4. A boiler steam sootblowing control system, applied to a boiler steam sootblowing control method as claimed in any one of claims 1 to 3, characterized in that: include: a plurality of vibrators, arranged on the boiler, for vibrating the boiler; A plurality of vibration sensors are arranged outside the boiler and used to monitor vibration characteristic data of the boiler; Soot blowing gun, used to guide steam to blow the accumulated soot on the heating surface; An analysis and processing module, used to control the operation of the vibrator and acquire and analyze the vibration characteristic data collected by the vibration sensor; The analysis and processing module determines the distribution of the dust accumulation and the thickness of the dust accumulation based on the vibration characteristic data, and drives the soot blowing gun to blow the dust accumulation according to the distribution of the dust accumulation and the thickness of the dust accumulation.

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