Data-driven coal-fired unit pulverized coal pipeline blockage fault analysis method and system

Abstract

The invention discloses a data-driven coal-fired unit pulverized coal pipeline blockage fault analysis method and system. The system comprises a first function module, a first subtraction module, a first greater module, a first delay module, a first AND module, a second greater module, a third greater module, a second AND module, a third AND module, a fourth AND module, a first NOT module, a fifth AND module, a first pulverized coal pipeline blockage early warning module and a second pulverized coal pipeline blockage early warning module. The method comprises the steps that when the value, calculated through a first function module, of the coal feed quantity is subtracted from the actual value of the primary air quantity, the obtained value is larger than the built-in constant 10 of a first larger module, the judgment is met, and the output is 1. According to the method, through comprehensive analysis and adoption of corresponding prevention measures, treatment measures for fault problems of blockage of the pulverized coal pipeline under different working conditions are judged respectively, blockage of the pulverized coal pipeline can be effectively reduced, and the safety and economical efficiency of a unit are improved.

Description

Technical Field

[0001] The invention belongs to the field of intelligent control of thermal power plants, and in particular relates to a data-driven coal-fired unit pulverized coal pipeline blockage fault analysis method and system. Background Art

[0002] The blockage of pulverized coal pipeline in coal-fired units is a common problem that affects the safety and efficiency of the units. The following are the causes of blockage of pulverized coal pipeline in coal-fired units: Problem 1: primary air pressure problem: When the quality of coal entering the furnace changes, resulting in a lower calorific value of the coal, more coal is needed under the corresponding load. If the primary air pressure is low at this time, or during the process of adding load and coal, the primary air pressure adjustment does not match the output of the pulverizing system, it will easily cause the powder pipe to become blocked.

[0003] Problem 2: Improper equipment adjustment: the plug door on the powder pipe is stuck and does not fully open; the coal powder separator is not designed and installed properly or the baffle is not adjusted properly, resulting in uneven powder output; fan or baffle failure, as well as human factors, may cause the powder pipe to be blocked.

[0004] Based on the above reasons, the blockage of pulverized coal pipeline in coal-fired units is a complex problem involving multiple factors. A data-driven coal pipeline blockage fault analysis method and system for coal-fired units is proposed. Through comprehensive analysis and taking corresponding preventive measures, the occurrence of pulverized coal pipeline blockage can be effectively reduced, and the safety and economy of the unit can be improved. Summary of the invention

[0005] The purpose of the present invention is to provide a data-driven coal-fired unit coal powder pipeline blockage fault analysis method and system. The present invention, through comprehensive analysis and taking corresponding preventive measures, respectively determines the treatment measures for the powder pipe blockage fault problem under different working conditions, which can effectively reduce the occurrence of coal powder pipeline blockage and improve the safety and economy of the unit.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: A data-driven coal-fired unit pulverized coal pipeline blockage fault analysis system comprises a first function module, a first subtraction module, a first greater than module, a first delay module, a first and module, a second greater than module, a third greater than module, a second and module, a third and module, a fourth and module, a first non-module, a fifth and module, a first pulverized coal pipeline blockage warning module and a second pulverized coal pipeline blockage warning module; The output end of the first function module is connected to the first subtraction module, the output end of the first subtraction module is connected to the first greater than module, and the output end of the first greater than module is connected to the first delay module; the output end of the second greater than module and the output end of the third greater than module are both connected to the second AND module; the output end of the second AND module and the third AND module are both connected to the fourth AND module; The output end of the first delay module and the output end of the fourth AND module are both connected to the first AND module, and the output end of the first AND module is connected to the first pulverized coal pipeline blockage early warning module; The output end of the first delay module is connected to the first NOT module, the output end of the first NOT module and the output end of the fourth AND module are connected to the fifth AND module, and the output end of the fifth AND module is connected to the second pulverized coal pipeline blockage warning module.

[0007] A further improvement of the present invention is that the coal feed amount is connected to the first function module.

[0008] A further improvement of the present invention is that the actual value of the primary air volume is connected to the first subtraction module.

[0009] A further improvement of the present invention is that the speed of the coal feeder belt motor is connected to the second greater than module; and the current of the coal mill is connected to the third greater than module.

[0010] A further improvement of the present invention is that the powder pipe coal blocking signal is connected to the fourth and module.

[0011] A further improvement of the present invention is that the first coal mill outlet air and dust discharge valve is opened, the second coal mill outlet air and dust discharge valve is opened, the third coal mill outlet air and dust discharge valve is opened, and the fourth coal mill outlet air and dust discharge valve is opened and connected to the third and module.

[0012] The data-driven coal-fired unit pulverized coal pipeline blockage fault analysis method includes: When the value of the coal feed calculated by the first function module is subtracted from the actual value of the primary air volume, the obtained value is greater than the module's built-in constant 10 for comparison, then this judgment is met and the output is 1.

[0013] A further improvement of the present invention is that it also includes: When the speed of the coal feeder belt motor satisfies the second greater than module's built-in constant 100, the coal mill current satisfies the third greater than module's built-in constant 5, and the powder pipe blockage signal, the first coal mill outlet air and powder discharge valve is open, the second coal mill outlet air and powder discharge valve is open, the third coal mill outlet air and powder discharge valve is open, and the fourth coal mill outlet air and powder discharge valve is open are all 1, then this judgment is met and the output is 1.

[0014] A further improvement of the present invention is that it also includes: If the first judgment condition is 1 and the second judgment condition is 1, the output is the first pulverized coal pipeline blockage warning module, and the operating personnel are prompted to reduce the coal feed rate of the pulverizer, increase the primary air volume, pay attention to the changes in boiler pressure and temperature, and prevent over-temperature and over-pressure.

[0015] A further improvement of the present invention is that it also includes: If the first judgment condition is 0 and the second judgment condition is 1, the output is the second pulverized coal pipeline blockage warning module, and the operating personnel are prompted to confirm the actual position of the separator, adjustable shrinkage hole and powder pipe manual plug-in door, check whether the combustion port has serious coking changes, and prevent over-temperature and over-pressure.

[0016] Compared with the prior art, the present invention has at least the following beneficial technical effects: The present invention provides a data-driven coal-fired unit coal powder pipeline blockage fault analysis method, which adopts a fault analysis and positioning method, utilizes system operating parameters such as coal feed rate, actual value of primary air volume, speed of coal feeder belt motor, coal mill current, coal powder pipe blockage signal, and state of air and powder discharge valve at coal mill outlet, and combines the actual operation of the coal mill to develop a coal powder pipeline blockage fault analysis method to meet the accurate judgment of different fault conditions.

[0017] The present invention provides a data-driven coal-fired unit coal powder pipeline blockage fault analysis system, which divides the coal mill powder pipe blockage fault analysis into two fault conditions. When the first fault condition occurs, the system will prompt you to reduce the coal feed of the coal mill, increase the primary air volume, and change the boiler pressure and temperature to prevent over-temperature and over-pressure; when the second fault condition occurs, the system will prompt you to confirm the actual position of the separator, adjustable shrinkage hole and powder pipe manual plug-in door, check whether the injection port has serious coking changes, and prevent over-temperature and over-pressure.

[0018] In summary, the data-driven coal-fired unit coal powder pipeline blockage fault analysis method and system described in the present invention take into account the safety, stability and efficiency of the coal mill powder pipe under different operating conditions, timely analyze and judge the problem of coal mill powder pipe blockage, and improve the safety and economy of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 The schematic diagram of the data-driven coal-fired unit pulverized coal pipeline blockage fault analysis system.

[0021] Figure 2 This is a rendering of an embodiment of the present invention.

[0022] Description of reference numerals: 001, coal feeding amount, 002, actual value of primary air volume, 003, speed of coal feeder belt motor, 004, coal mill current, 005, coal powder pipe blocking signal, 006, the first coal mill outlet air and powder discharge valve is open, 007, the second coal mill outlet air and powder discharge valve is open, 008, the third coal mill outlet air and powder discharge valve is open, 009, the fourth coal mill outlet air and powder discharge valve is open, 010, the first function module, 011, the first subtraction module, 012, the first greater than module, 013, the first delay module, 014, the first and module, 015, the second greater than module, 016, the third greater than module, 017, the second and module, 018, the third and module, 019, the fourth and module, 020, the first non-module, 021, the fifth and module, 022, the first coal powder pipeline blockage warning module, 023, the second coal powder pipeline blockage warning module. DETAILED DESCRIPTION

[0023] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0026] In the present invention, unless otherwise clearly defined or limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the present invention, unless otherwise clearly defined or limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0028] It should be understood that when used in this specification and the appended claims, the terms "comprises" and "comprising" indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations.

[0029] It should also be understood that the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0030] It should be further understood that the term " / and" used in the specification of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0031] Structural schematic diagrams according to various disclosed embodiments of the present invention are shown in the drawings. These drawings are not drawn to scale, in which for the purpose of clear expression, some details are enlarged and some details may be omitted. The shapes of various regions and layers shown in the drawings and their relative sizes and positional relationships are only exemplary, and may actually deviate due to manufacturing tolerances or technical limitations, and those skilled in the art can design regions / layers with different shapes, sizes and relative positions according to actual needs.

[0032] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0033] The present invention provides a data-driven coal-fired unit coal powder pipeline blockage fault analysis method and system, which takes into account the safety, stability and efficiency of the coal mill powder pipe under different operating conditions, timely analyzes and determines the problem of coal mill powder pipe blockage, and improves the safety and economy of the unit.

[0034] Example 1 like Figure 1 As shown, the data-driven coal-fired unit coal powder pipeline blockage fault analysis system provided by the present invention includes a first function module 010, a first subtraction module 011, a first greater than module 012, a first delay module 013, a first and module 014, a second greater than module 015, a third greater than module 016, a second and module 017, a third and module 018, a fourth and module 019, a first non-module 020, a fifth and module 021, a first coal powder pipeline blockage warning module 022 and a second coal powder pipeline blockage warning module 023; the output end of the first function module 010 is connected to the first subtraction module 011, the output end of the first subtraction module 011 is connected to the first greater than module 012, and the output end of the first greater than module 012 is connected to The first delay module 013; the output end of the second greater than module 015 and the output end of the third greater than module 016 are both connected to the second AND module 017; the output end of the second AND module 017 and the third AND module 018 are both connected to the fourth AND module 019; the output end of the first delay module 013 and the output end of the fourth AND module 019 are both connected to the first AND module 014, and the output end of the first AND module 014 is connected to the first coal powder pipeline blockage warning module 022; the output end of the first delay module 013 is connected to the first non-module 020, the output end of the first non-module 020 and the output end of the fourth AND module 019 are connected to the fifth AND module 021, and the output end of the fifth AND module 021 is connected to the second coal powder pipeline blockage warning module 023.

[0035] In this embodiment, the coal feed amount 001 is connected to the first function module 010 .

[0036] In this embodiment, the actual value of the primary air volume 002 is connected to the first subtraction module 011 .

[0037] In this embodiment, the coal feeder belt motor speed 003 is connected to the second greater than module 015; the coal mill current 004 is connected to the third greater than module 016.

[0038] In this embodiment, the powder pipe blocking coal signal 005 is connected to the fourth AND module 019 .

[0039] In this embodiment, the first coal mill outlet air and dust discharge valve has been opened 006, the second coal mill outlet air and dust discharge valve has been opened 007, the third coal mill outlet air and dust discharge valve has been opened 008, and the fourth coal mill outlet air and dust discharge valve has been opened 009 are all connected to the third and module 018.

[0040] Example 2 like Figure 1 As shown, the data-driven coal-fired unit pulverized coal pipeline blockage fault analysis system provided by the present invention includes: coal supply amount 001, actual value of primary air volume 002, speed of coal feeder belt motor 003, coal mill current 004, pulverized coal pipe blocking signal 005, first coal mill outlet air and powder discharge valve opened 006, second coal mill outlet air and powder discharge valve opened 007, third coal mill outlet air and powder discharge valve opened 008, fourth coal mill outlet air and powder discharge valve opened 009, first function module 010, first subtraction module 011, first greater than module 012, first delay module 013, first and module 014, second greater than module 015, third greater than module 016, second and module 017, third and module 018, fourth and module 019, first non-module 020, fifth and module 021, first pulverized coal pipeline blockage warning module 022 and second pulverized coal pipeline blockage warning module 023.

[0041] Among them, the coal feeding amount 001 is connected to the first function module 010, the output end of the first function module 010 and the actual value of the primary air volume 002 are both connected to the first subtraction module 011, the output end of the first subtraction module 011 is connected to the first greater than module 012, and the output end of the first greater than module 012 is connected to the first delay module 013; the coal feeder belt motor speed 003 is connected to the second greater than module 015, the coal mill current 004 is connected to the third greater than module 016, the output end of the second greater than module 015 and the output end of the third greater than module 016 are both connected to the second AND module 017; the first coal mill outlet air and dust discharge valve has been opened 006, the second coal mill outlet air and dust discharge valve has been opened 007, the third coal mill outlet air and dust discharge valve has been opened 008, and the fourth coal mill outlet air and dust discharge valve has been opened 009 are all connected to the third AND module 018, and the output end of the second AND module 017, the powder pipe coal blocking signal 005, and the third AND module 018 are all connected to the fourth AND module 019.

[0042] The output end of the first delay module 013 and the output end of the fourth AND module 019 are both connected to the first AND module 014 , and the output end of the first AND module 014 is connected to the first pulverized coal pipeline blockage early warning module 022 .

[0043] The output end of the first delay module 013 is connected to the first non-module 020 , the output end of the first non-module 020 and the output end of the fourth AND module 019 are connected to the fifth AND module 021 , and the output end of the fifth AND module 021 is connected to the second pulverized coal pipeline blockage warning module 023 .

[0044] The system of the present invention is decomposed into multiple modules with clear functions, such as function module, subtraction module, greater than module, delay module, and module, not module, etc. This modular design makes the system structure clear, easy to understand and maintain. When a module needs to be modified or upgraded, it can be done independently without affecting the normal operation of other modules, thereby improving the maintainability and scalability of the system.

[0045] Example 3 like Figure 1 As shown, the data-driven coal-fired unit pulverized coal pipeline blockage fault analysis method provided by the present invention includes: 1) The first judgment condition: When the value of the coal feed 001 calculated by the first function module 010 is subtracted from the actual value of the primary air volume 002, the obtained value is greater than the built-in constant 10 of the module 012 for comparison, then this judgment is satisfied and the output is 1.

[0046] 2) The second judgment condition: when the coal feeder belt motor speed 003 satisfies the second built-in constant 100 which is greater than module 015, the coal mill current 004 satisfies the third built-in constant 5 which is greater than module 016, and the powder pipe blockage signal 005, the first coal mill outlet air and powder discharge valve is open 006, the second coal mill outlet air and powder discharge valve is open 007, the third coal mill outlet air and powder discharge valve is open 008, and the fourth coal mill outlet air and powder discharge valve is open 009 are all 1, this judgment is met and the output is 1.

[0047] 3) If the first judgment condition is 1 and the second judgment condition is 1, the output is the first pulverized coal pipeline blockage warning module 022, and the operating personnel are prompted to reduce the coal feed rate of the pulverizer, increase the primary air volume, pay attention to the changes in boiler pressure and temperature, and prevent over-temperature and over-pressure.

[0048] 4) If the first judgment condition is 0 and the second judgment condition is 1, the output is the second pulverized coal pipeline blockage warning module 023, and the operating personnel are prompted to confirm the actual position of the separator, adjustable shrinkage hole and powder pipe manual plug-in door, check whether the burner port has serious coking changes, and prevent over-temperature and over-pressure.

[0049] Example 4 like Figure 2As shown, through the implementation and application of the technology of the present invention in the simulation environment, in the time period of 18:20:00-19:20:00, the actual value of the powder hose differential pressure began to gradually increase from 0.5kPa to about 2.5kPa. At 18:20:00, the predicted value can completely correspond to the curve of the actual value, fully analyzing the variation law and range of the current powder hose differential pressure, and the phenomenon of branch pipe blockage has occurred. The predicted value curve determined by the model can timely discover the blockage fault and remind the operator to deal with this fault.

[0050] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0051] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A data-driven coal-fired unit pulverized coal pipeline blockage fault analysis system, characterized in that: It comprises a first function module (010), a first subtraction module (011), a first greater than module (012), a first delay module (013), a first AND module (014), a second greater than module (015), a third greater than module (016), a second AND module (017), a third AND module (018), a fourth AND module (019), a first non-module (020), a fifth AND module (021), a first pulverized coal pipeline blockage warning module (022) and a second pulverized coal pipeline blockage warning module (023); The output end of the first function module (010) is connected to the first subtraction module (011), the output end of the first subtraction module (011) is connected to the first greater than module (012), and the output end of the first greater than module (012) is connected to the first delay module (013); the output end of the second greater than module (015) and the output end of the third greater than module (016) are both connected to the second AND module (017); the output end of the second AND module (017) and the third AND module (018) are both connected to the fourth AND module (019); The output end of the first delay module (013) and the output end of the fourth AND module (019) are both connected to the first AND module (014), and the output end of the first AND module (014) is connected to the first pulverized coal pipeline blockage early warning module (022); The output end of the first delay module (013) is connected to the first non-module (020), the output end of the first non-module (020) and the output end of the fourth AND module (019) are connected to the fifth AND module (021), and the output end of the fifth AND module (021) is connected to the second coal powder pipeline blockage warning module (023).

2. The data-driven coal-fired unit pulverized coal pipeline blockage fault analysis system according to claim 1 is characterized in that: The coal feed amount (001) is connected to the first function module (010).

3. The data-driven coal-fired unit pulverized coal pipeline blockage fault analysis system according to claim 2 is characterized in that: The actual value of the primary air volume (002) is connected to the first subtraction module (011).

4. The data-driven coal-fired unit pulverized coal pipeline blockage fault analysis system according to claim 3 is characterized in that: The coal feeder belt motor speed (003) is connected to the second greater than module (015); the coal mill current (004) is connected to the third greater than module (016).

5. The data-driven coal-fired unit pulverized coal pipeline blockage fault analysis system according to claim 4 is characterized in that: The powder pipe blockage signal (005) is connected to the fourth AND module (019).

6. The data-driven coal-fired unit pulverized coal pipeline blockage fault analysis system according to claim 5 is characterized in that: The first coal mill outlet air and dust discharge valve is open (006), the second coal mill outlet air and dust discharge valve is open (007), the third coal mill outlet air and dust discharge valve is open (008), and the fourth coal mill outlet air and dust discharge valve is open (009) and are all connected to the third and module (018).

7. A data-driven coal-fired unit pulverized coal pipeline blockage fault analysis method, characterized in that: The method is based on the data-driven coal-fired unit pulverized coal pipeline blockage fault analysis system according to claim 6, comprising: When the value of the coal feed amount (001) calculated by the first function module (010) is subtracted from the actual value of the primary air volume (002), the obtained value is compared with the built-in constant 10 of the first greater than module (012), then this judgment is satisfied and the output is 1.

8. The data-driven coal-fired unit pulverized coal pipeline blockage fault analysis method according to claim 7, characterized in that: Also includes: When the coal feeder belt motor speed (003) satisfies the second greater than module (015) built-in constant 100, the coal mill current (004) satisfies the third greater than module (016) built-in constant 5, and the powder pipe blockage signal (005), the first coal mill outlet air and powder discharge valve is open (006), the second coal mill outlet air and powder discharge valve is open (007), the third coal mill outlet air and powder discharge valve is open (008), and the fourth coal mill outlet air and powder discharge valve is open (009) are all 1, this judgment is met and the output is 1.

9. The data-driven coal-fired unit pulverized coal pipeline blockage fault analysis method according to claim 8, characterized in that: Also includes: If the first judgment condition is 1 and the second judgment condition is 1, the output is the first pulverized coal pipeline blockage warning module (022), and the operating personnel are prompted to reduce the coal feed rate of the pulverizer, increase the primary air volume, pay attention to the changes in boiler pressure and temperature, and prevent over-temperature and over-pressure.

10. The data-driven coal-fired unit pulverized coal pipeline blockage fault analysis method according to claim 9, characterized in that: Also includes: If the first judgment condition is 0 and the second judgment condition is 1, the output is the second pulverized coal pipeline blockage warning module (023), and the operating personnel are prompted to confirm the actual positions of the separator, adjustable shrinkage hole and powder pipe manual plug-in door, check whether the burner port has serious coking changes, and prevent over-temperature and over-pressure.

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