Intelligent control method and system for air volume of coal pulverizing system under various working conditions

Abstract

The invention discloses an intelligent air quantity control method and system for a coal pulverizing system under various working conditions. The system comprises a first switching module, a first AND module, a second AND module, a first lead-lag module, a first over-limit alarm module, a first NOT module, a first AND module, a second over-limit alarm module, a second AND module and a first function curve module. The method comprises the following steps: when the first switching module is 1 and the fault early warning output of the hot air regulating valve is 1, and the primary air flow of the coal mill is greater than 47.7 after passing through the first lead-lag module and the first over-limit alarm module, the final output is the fault of the hot air regulating valve and the air flow is greater than 47.7 thh, and the coal feeding amount is set. In the operation stages of all working conditions, the air volume requirement of the coal pulverizing system can change along with the change of the boiler load, the control system can quickly respond to the load change, and the air volume is changed by automatically adjusting the opening degree of the air door or the rotating speed of the draught fan so as to adapt to the new load requirement.

Description

Technical Field

[0001] The invention belongs to the field of intelligent control of thermal power plants, and in particular relates to an intelligent control method and system for air volume under various working conditions of a pulverizing system. Background Art

[0002] The pulverizing system is an important component of thermal power generation, and its operating status directly affects the combustion efficiency of the boiler and the economy of the overall power plant. When the pulverizing system enters the stable operation stage, the control of the air volume will mainly depend on the feedback signal of the system, such as the outlet temperature of the coal mill, the primary air pressure and other parameters. Through real-time monitoring and adjustment of these parameters, it can be ensured that the match between the air volume and the amount of fuel reaches the best state, thereby improving the combustion efficiency and economy. However, the air volume control under various working conditions of the pulverizing system is a complex and delicate process, which requires comprehensive consideration of multiple factors and the adoption of corresponding control strategies. By continuously optimizing and improving the air volume control technology, the operating efficiency and stability of the pulverizing system can be improved, contributing to the sustainable development of thermal power generation enterprises. Summary of the invention

[0003] The purpose of the present invention is to provide an intelligent air volume control method and system for a powder making system under various operating conditions. In the present invention, during the various operating stages, the air volume demand of the powder making system will change with the change of the boiler load. The control system can quickly respond to the load change and change the air volume by automatically adjusting the damper opening or the fan speed to adapt to the new load demand.

[0004] In order to achieve the above object, the present invention adopts the following technical solution: The present invention provides an intelligent air volume control system under various working conditions of a milling system, comprising a first switching module, a first AND module, a second AND module, a first lead-lag module, a first over-limit alarm module, a first non-module, a first AND module, a second over-limit alarm module, a second AND module and a first function curve module; The first switching module is connected to the first AND module, the first leading and lagging module is connected to the first over-limit alarm module and the first non-module in sequence, and the output end of the first AND module and the output end of the first over-limit alarm module are both connected to the second AND module; The output terminal of the first AND module and the output terminal of the first NOT module are both connected to the first AND module; The output end of the first AND module and the output end of the first non-module are both connected to the first AND module, and the output end of the first AND module and the output end of the second over-limit alarm module are both connected to the second AND module; The first lead-lag module is sequentially connected to the first function curve module and the coal feed amount corresponding to the primary air volume.

[0005] A further improvement of the present invention is that the hot air regulating valve fault warning output is connected to the first and module; The primary air flow of the coal mill is connected to the first lead-lag module.

[0006] A further improvement of the present invention is that the position feedback of the cold air regulating door of the coal mill is connected to the second over-limit alarm module.

[0007] A further improvement of the present invention is that the output end of the second AND module is connected to the hot air regulating valve failure and the wind is greater than 47.7thh and the coal supply amount is set.

[0008] A further improvement of the present invention is that the output end of the first AND module is connected to the hot air regulating valve when the hot air regulating valve fails and the wind speed is less than 47.7thh and the cold air regulating valve is opened.

[0009] A further improvement of the present invention is that the output end of the second and module is connected to the coal mill which is fully opened and has low air volume and is sequentially controlled to stop.

[0010] The present invention also provides an intelligent control method for air volume under various working conditions of a milling system. The method is based on the intelligent control system for air volume under various working conditions of the milling system, and includes: When the first switching module is 1 and the hot air regulating valve fault warning output is 1, when the primary air flow of the coal mill passes through the first lead-lag module and the first over-limit alarm module and is greater than 47.7, the final output is a hot air regulating valve failure and the wind is greater than 47.7th and the coal feed rate is set.

[0011] A further improvement of the present invention is that it also includes: when the first switching module is 1 and the hot air regulating valve fault warning output is 1, when the primary air flow of the coal mill passes through the first lead-lag module and the first over-limit alarm module to meet the requirement of being less than 47.7, the final output is that the hot air regulating valve fails and the wind is less than 47.7th and the cold air regulating valve is opened.

[0012] A further improvement of the present invention is that it also includes: when the first switching module is 1 and the hot air regulating valve fault warning output is 1, when the primary air flow of the coal mill is less than 47.7 after the first lead-lag module and the first over-limit alarm module, and the position feedback of the cold air regulating door of the coal mill is greater than 80, the final output is that the cold air regulating valve is fully opened and the air volume is low, and the coal mill is stopped by sequential control.

[0013] A further improvement of the present invention is that it also includes: after the primary air flow of the coal mill is calculated by the first lead-lag module and the first function curve module, the final output is the coal feed amount corresponding to the primary air volume.

[0014] Compared with the prior art, the present invention has at least the following beneficial technical effects: The present invention provides an intelligent air volume control method under various working conditions of a pulverizing system, which obtains equipment information of each coal mill in the pulverizing system, and assigns values ​​to the coal mills according to the information to obtain basic scores. Then, the basic scores are adjusted according to the equipment status of the coal mills to obtain evaluation scores, and the coal mills are prioritized and their start and stop order is determined accordingly.

[0015] The present invention provides an intelligent air volume control system under various working conditions of a pulverizing system, which monitors the operating status of the pulverizing system, determines the start and stop demand type of the coal mill, and controls the start or stop of the coal mill according to the start and stop demand type and the start and stop sequence of the coal mill. This system can effectively reduce the operating burden of operating personnel, reduce the error operation rate, and improve the stability and economy of the pulverizing system.

[0016] In summary, the intelligent air volume control method and system under various working conditions of the pulverizing system described in the present invention comprehensively consider various factors of the pulverizing system and adopt corresponding control strategies. By continuously optimizing and improving the air volume control technology, the operating efficiency and stability of the pulverizing system can be improved, thereby contributing to the sustainable development of thermal power generation enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 This is the schematic diagram of the intelligent air volume control system under various working conditions of the powder making system.

[0019] Figure 2 This is a rendering of an embodiment of the present invention.

[0020] Description of reference numerals: 001. The first switching module, 002. The hot air regulating valve fault warning output, 003. The primary air flow of the coal mill, 004. The position feedback of the cold air regulating door of the coal mill, 005. The first AND module, 006. The second AND module, 007. The first lead-lag module, 008. The first over-limit alarm module, 009. The first non-module, 010. The first AND module, 011. The second over-limit alarm module, 012. The second AND module, 013. The first function curve module, 014. The hot air regulating valve fails and the wind is greater than 47.7thh and the coal supply is set, 015. The hot air regulating valve fails and the wind is less than 47.7thh and the cold air regulating valve is opened, 016. The cold air regulating valve is fully opened and the air volume is low and the coal mill is stopped by sequential control, 017. The coal supply corresponding to the primary air volume. DETAILED DESCRIPTION

[0021] 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.

[0022] 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.

[0023] 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.

[0024] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0026] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0027] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0028] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0029] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0030] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0031] The purpose of the present invention is to provide an intelligent air volume control method and system for a powder making system under various operating conditions. In the present invention, during the various operating stages, the air volume demand of the powder making system will change with the change of the boiler load. The control system can quickly respond to the load change and change the air volume by automatically adjusting the damper opening or the fan speed to adapt to the new load demand.

[0032] Example 1 like Figure 1As shown, the air volume intelligent control system under various working conditions of the milling system provided by the present invention comprises a first switching module 001, a first AND module 005, a second AND module 006, a first lead-lag module 007, a first over-limit alarm module 008, a first non-module 009, a first AND module 010, a second over-limit alarm module 011, a second AND module 012 and a first function curve module 013; the first switching module 001 is connected to the first AND module 005, the first lead-lag module 007 is connected to the first over-limit alarm module 008 and the first non-module 009 in sequence, and the first AND module The output end of 005 and the output end of the first over-limit alarm module 008 are both connected to the second AND module 006; the output end of the first AND module 005 and the output end of the first non-module 009 are both connected to the first AND module 010; the output end of the first AND module 005 and the output end of the first non-module 009 are both connected to the first AND module 010, and the output end of the first AND module 010 and the output end of the second over-limit alarm module 011 are both connected to the second AND module 012; the first lead-lag module 007 is sequentially connected to the first function curve module 013 and the coal supply amount 017 corresponding to the primary air volume.

[0033] The present invention adopts multiple modules for construction, and this modular design makes the system more flexible and expandable. When it is necessary to modify or upgrade the system function, it is only necessary to operate on a specific module without making large-scale changes to the entire system. The present invention makes the logical control process of the system clear and easy to understand through the clear module connection relationship. This helps maintenance personnel to quickly understand the working principle of the system and perform troubleshooting and repair. The present invention includes a first over-limit alarm module 008 and a second over-limit alarm module 011, which can send out an alarm signal when the system parameters exceed the set range, thereby promptly reminding the operator to take measures to avoid potential safety hazards. The introduction of the first lead-lag module 007 enables the system to perform predictive adjustment based on historical data and current trends, thereby more accurately controlling the air volume. This adjustment method helps to improve the stability and response speed of the system. The first function curve module 013 can finely adjust the air volume according to a preset functional relationship. This adjustment method not only improves the accuracy of control, but also enables the system to adapt to more complex working conditions.

[0034] In this embodiment, the hot air regulating valve fault warning output 002 is connected to the first AND module 005 ; the coal mill primary air flow 003 is connected to the first lead-lag module 007 .

[0035] In this embodiment, the coal mill cold air regulating door position feedback 004 is connected to the second over-limit alarm module 011 .

[0036] In this embodiment, the output end of the second AND module 006 is connected to the hot air regulating valve failure and the wind speed is greater than 47.7thh and the coal supply amount 014 is set.

[0037] In this embodiment, the output end of the first AND module 010 is connected to the hot air regulating valve 015 when the hot air regulating valve fails and the wind speed is less than 47.7thh and the cold air regulating valve 015 is opened.

[0038] In this embodiment, the output end of the second AND module 012 is connected to the cold air regulating valve fully opened with low air volume and the coal mill 016 is stopped by sequential control.

[0039] Example 2 like Figure 1 As shown, the air volume intelligent control system under various working conditions of the pulverizing system provided by the present invention includes: a first switching module 001, a hot air regulating valve fault warning output 002, a coal mill primary air flow 003, a coal mill cold air regulating door position feedback 004, a first and module 005, a second and module 006, a first lead-lag module 007, a first over-limit alarm module 008, a first non-module 009, a first and module 010, a second over-limit alarm module 011, a second and module 012, a first function curve module 013, a hot air regulating valve fault and the wind is greater than 47.7thh and the coal feed is set 014, a hot air regulating valve fault and the wind is less than 47.7thh and the cold air regulating valve is opened 015, the cold air regulating valve is fully opened with low air volume and the coal mill is stopped 016 by sequential control, and the coal feed corresponding to the primary air volume 017.

[0040] Among them, the connection method of the hot air regulating valve failure and the wind li is greater than 47.7thh and the set coal supply amount 014 includes: the first switching module 001 and the hot air regulating valve failure warning output 002 are both connected to the first AND module 005, the coal mill primary air flow 003 is connected to the first lead-lag module 007 and the first over-limit alarm module 008 in sequence, the output end of the first AND module 005 and the output end of the first over-limit alarm module 008 are both connected to the second AND module 006, and the output end of the second AND module 006 is connected to the hot air regulating valve failure and the wind li is greater than 47.7thh and the set coal supply amount 014.

[0041] The connection method of the hot air regulating valve failure and the wind li is less than 47.7thh and the cold air regulating valve 015 is opened includes: the first switching module 001 and the hot air regulating valve failure warning output 002 are both connected to the first AND module 005, the coal mill primary air flow 003 is sequentially connected to the first lead-lag module 007, the first over-limit alarm module 008, and the first non-module 009, the output end of the first AND module 005 and the output end of the first non-module 009 are both connected to the first AND module 010, and the output end of the first AND module 010 is connected to the hot air regulating valve failure and the wind li is less than 47.7thh and the cold air regulating valve 015 is opened.

[0042] The connection method of the cold air regulating valve fully open with low air volume and sequentially controlled stop of the coal mill 016 includes: the first switching module 001 and the hot air regulating valve fault warning output 002 are both connected to the first AND module 005, the coal mill primary air flow 003 is sequentially connected to the first lead-lag module 007, the first over-limit alarm module 008, and the first non-module 009, the output end of the first AND module 005 and the output end of the first non-module 009 are both connected to the first AND module 010, the coal mill cold air regulating door position feedback 004 is connected to the second over-limit alarm module 011, the output end of the first AND module 010 and the output end of the second over-limit alarm module 011 are both connected to the second AND module 012, and the output end of the second AND module 012 is connected to the cold air regulating valve fully open with low air volume and sequentially controlled stop of the coal mill 016.

[0043] The connection method of the coal feeding amount 017 corresponding to the primary air volume includes: the primary air flow rate 003 of the coal mill is sequentially connected to the first lead-lag module 007, the first function curve module 013, and the coal feeding amount 017 corresponding to the primary air volume.

[0044] Example 3 like Figure 1 As shown, the method for intelligently controlling the air volume of a powder making system under various working conditions provided by the present invention includes: 1) When the first switching module 001 is 1 and the hot air regulating valve fault warning output 002 is 1, when the coal mill primary air flow 003 meets the requirement of being greater than 47.7 after the first leading and lagging module 007 and the first over-limit alarm module 008, the final output is that the hot air regulating valve is faulty and the air flow is greater than 47.7thh and the coal feed rate 014 is set; 2) When the first switching module 001 is 1 and the hot air regulating valve fault warning output 002 is 1, when the coal mill primary air flow 003 is less than 47.7 after the first leading and lagging module 007 and the first over-limit alarm module 008, the final output is that the hot air regulating valve is faulty and the air flow is less than 47.7thh and the cold air regulating valve 015 is opened; 3) When the first switching module 001 is 1 and the hot air regulating valve fault warning output 002 is 1, when the coal mill primary air flow 003 meets the first lead-lag module 007 and the first over-limit alarm module 008 to be less than 47.7, and the coal mill cold air regulating door position feedback 004 meets the requirement of being greater than 80, the final output is that the cold air regulating valve is fully opened and the air volume is low and the coal mill is stopped by sequential control 016; 4) After the coal mill primary air flow 003 is calculated by the first lead-lag module 007 and the first function curve module 013, the final output is the coal feed amount 017 corresponding to the primary air volume.

[0045] Example 4 like Figure 2As shown, through the implementation and application of the technology of the present invention in a simulation environment, within the time range of 07:20:52-14:59:00, the historical milling system operating parameters are transmitted to the milling system intelligent air volume control method and system under various working conditions developed by the present invention. The dynamic parameters of the air volume can be well predicted, and the predicted parameter range is within 0t / h to 200t / h, which is consistent with the current unit operating conditions and achieves a high consistency. It can provide assistance to production operators in air volume control when monitoring the panel, and ensure the safe and stable operation of the unit.

[0046] 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.

[0047] 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. The intelligent control system of air volume under various working conditions of the milling system is characterized by: It comprises a first switching module (001), a first AND module (005), a second AND module (006), a first lead-lag module (007), a first over-limit alarm module (008), a first non-module (009), a first AND module (010), a second over-limit alarm module (011), a second AND module (012) and a first function curve module (013); The first switching module (001) is connected to the first AND module (005), the first leading and lagging module (007) is connected to the first over-limit alarm module (008) and the first non-module (009) in sequence, and the output end of the first AND module (005) and the output end of the first over-limit alarm module (008) are both connected to the second AND module (006); The output terminal of the first AND module (005) and the output terminal of the first NOT module (009) are both connected to the first AND module (010); The output end of the first AND module (005) and the output end of the first non-module (009) are both connected to the first AND module (010), and the output end of the first AND module (010) and the output end of the second over-limit alarm module (011) are both connected to the second AND module (012); The first lead-lag module (007) is sequentially connected to the first function curve module (013) and the coal supply amount (017) corresponding to the primary air volume.

2. The intelligent control system for air volume under various working conditions of the milling system according to claim 1 is characterized in that: The hot air regulating valve fault warning output (002) is connected to the first AND module (005); The coal mill primary air flow (003) is connected to the first lead-lag module (007).

3. The intelligent control system for air volume under various working conditions of the milling system according to claim 2 is characterized in that: The coal mill cold air regulating door position feedback (004) is connected to the second over-limit alarm module (011).

4. The intelligent control system for air volume under various working conditions of the milling system according to claim 3 is characterized in that: The output end of the second AND module (006) is connected to the hot air regulating valve failure and the wind is greater than 47.7thh and the coal supply amount (014) is set.

5. The intelligent control system for air volume under various working conditions of the milling system according to claim 4 is characterized in that: The output end of the first AND module (010) is connected to the hot air regulating valve (015) when the hot air regulating valve fails and the wind speed is less than 47.7thh and the cold air regulating valve (015) is opened.

6. The intelligent air volume control system under various working conditions of the milling system according to claim 5 is characterized in that: The output end of the second AND module (012) is connected to the cold air regulating valve fully opened to low air volume and sequentially controlled to stop the coal mill (016).

7. The intelligent control method of air volume under various working conditions of the milling system is characterized by: The method is based on the intelligent air volume control system under various working conditions of the pulverizing system according to claim 6, comprising: When the first switching module (001) is 1 and the hot air regulating valve fault warning output (002) is 1, when the primary air flow rate (003) of the coal mill is greater than 47.7 after the first lead-lag module (007) and the first over-limit alarm module (008), the final output is that the hot air regulating valve is faulty and the air flow is greater than 47.7th and the coal feed rate (014) is set.

8. The method for intelligently controlling air volume under various working conditions of a milling system according to claim 7 is characterized in that: Also includes: When the first switching module (001) is 1 and the hot air regulating valve fault warning output (002) is 1, when the coal mill primary air flow (003) is less than 47.7 after the first lead-lag module (007) and the first over-limit alarm module (008), the final output is that the hot air regulating valve fails and the air flow is less than 47.7th, and the cold air regulating valve (015) is opened.

9. The method for intelligently controlling air volume under various working conditions of a milling system according to claim 8 is characterized in that: Also includes: When the first switching module (001) is 1 and the hot air regulating valve fault warning output (002) is 1, when the primary air flow rate (003) of the coal mill is less than 47.7 after the first lead-lag module (007) and the first over-limit alarm module (008), and the coal mill cold air regulating door position feedback (004) is greater than 80, the final output is that the cold air regulating valve is fully opened and the air volume is low and the coal mill is stopped by sequential control (016).

10. The method for intelligently controlling air volume under various working conditions of a powder making system according to claim 9, characterized in that: Also includes: After the primary air flow rate (003) of the coal mill is calculated by the first lead-lag module (007) and the first function curve module (013), the final output is the coal feed rate (017) corresponding to the primary air volume.

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