Method, system and equipment for controlling primary air pressure of coal-fired unit, medium and product

Abstract

The invention discloses a coal-fired unit primary air pressure control method, system and equipment, a medium and a product, and relates to the field of intelligent control of generator sets, and the method comprises the steps that real-time operation data of a coal-fired unit is obtained; a primary air pressure amplitude limiting value is determined by combining the average coal supply quantity-air pressure amplitude limiting mapping table, and a primary air pressure candidate value group is determined through the corrected total coal quantity-air pressure candidate value mapping table of different mapping relations; a primary air pressure target value is obtained based on the primary air pressure amplitude limiting value and the candidate value set; and adjusting related equipment of the primary air system according to the primary air pressure target value. The method can effectively cope with complex and changeable operation conditions of the coal-fired unit, reduces primary air pressure fluctuation, improves the combustion efficiency of the boiler, guarantees stable and efficient operation of the unit, and enhances the economical efficiency and reliability of operation of the unit.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of intelligent control of generator sets, in particular to a control method, system, device, medium and product for primary air pressure of a coal-fired generator set. BACKGROUND

[0002] In the field of energy production, coal-fired power generation, as an important power supply method, plays a key role in ensuring stable energy supply. With the continuous development of the electricity market and the increasing demand for energy utilization efficiency and environmental protection, coal-fired generator sets are facing more complex and variable operating environments and more stringent performance requirements. Efficient, stable and flexible operation of coal-fired generator sets is of great significance to ensure the reliability of power supply, reduce power generation costs and reduce pollutant emissions. The stable control of primary air pressure is a key link in the operation of coal-fired generator sets, which directly affects the combustion efficiency of the boiler, the conveying effect of the coal powder and the overall operating performance of the unit.

[0003] During actual operation of the coal-fired generator set, it will experience various different working conditions, such as start and stop of the unit, rapid change of load, switching of the coal mill, etc. These working condition changes will cause significant changes in the pressure demand of the primary air fan. The primary air pressure control method in the related art is often based on fixed parameter settings, which is difficult to adapt to complex and variable working conditions. When facing rapid changes in working conditions, it is difficult to timely and accurately adjust the primary air pressure set value, which can easily lead to excessive fluctuations in the primary air pressure, thereby affecting the stability of the boiler combustion and the operating efficiency of the unit, and even may cause safety hazards.

[0004] Therefore, there is an urgent need for a control method that can adapt to the multi-working condition operation of the coal-fired generator set and realize self-adaptation of the primary air pressure set value. SUMMARY

[0005] The purpose of the present application is to provide a control method, system, device, medium and product for primary air pressure of a coal-fired generator set, which can accurately adapt to different operating conditions of the coal-fired generator set, ensure stable primary air pressure, directly ensure safe and stable operation of the unit and economic and efficient production, and provide more solid technical support and protection for the sustainable development of the coal-fired power generation industry.

[0006] To achieve the above purpose, the present application provides the following solutions:

[0007] In a first aspect, the present application provides a control method for primary air pressure of a coal-fired generator set, comprising:

[0008] obtaining real-time operating data of the coal-fired generator set; the real-time operating data includes a coal supply amount instruction of a coal feeder, a number of coal feeders in operation and an operating condition; the operating condition includes a load fluctuation condition, a coal quality change condition, a unit start-stop condition or a coal mill switching condition;

[0009] determine a primary air pressure limit value at the current time according to the coal feeder coal quantity instruction and the coal feeder running quantity in the real-time operation data, in combination with an average coal quantity-primary air pressure limit mapping table;

[0010] determine a primary air pressure candidate value group at the current time according to the corrected total coal quantity through a corrected total coal quantity-primary air pressure candidate value mapping table of different mapping relationships; the corrected total coal quantity is obtained by dynamically correcting the coal quantity instruction based on the running condition in the real-time operation data through a condition-compensation coefficient mapping table and a step compensation rule;

[0011] obtain a primary air pressure target value at the current time based on the primary air pressure limit value at the current time and the primary air pressure candidate value group;

[0012] control and adjust the primary air system related equipment according to the primary air pressure target value at the current time; the primary air system related equipment includes a primary air fan, a damper and a baffle.

[0013] In a second aspect, the present application provides a primary air pressure control system of a coal-fired unit, comprising:

[0014] a data acquisition unit configured to acquire real-time operation data of the coal-fired unit; the real-time operation data includes a coal feeder coal quantity instruction, a coal feeder running quantity and a running condition; the running condition includes a load fluctuation condition, a coal quality change condition, a unit start-stop condition or a coal mill switching condition;

[0015] a limit value calculation unit configured to determine a primary air pressure limit value at the current time according to the coal feeder coal quantity instruction and the coal feeder running quantity in the real-time operation data, in combination with an average coal quantity-primary air pressure limit mapping table;

[0016] a pressure candidate value calculation unit configured to determine a primary air pressure candidate value group at the current time according to the corrected total coal quantity through a corrected total coal quantity-primary air pressure candidate value mapping table of different mapping relationships; the corrected total coal quantity is obtained by dynamically correcting the coal quantity instruction based on the running condition in the real-time operation data through a condition-compensation coefficient mapping table and a step compensation rule;

[0017] a target value determination unit configured to obtain a primary air pressure target value at the current time based on the primary air pressure limit value at the current time and the primary air pressure candidate value group;

[0018] a control and adjustment unit configured to control and adjust the primary air system related equipment according to the primary air pressure target value at the current time; the primary air system related equipment includes a primary air fan, a damper and a baffle.

[0019] In a third aspect, the present application provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor executes the computer program to implement the steps of the control method of the primary air pressure of the coal-fired generating unit according to any one of the above.

[0020] In a fourth aspect, the present application provides a computer-readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the steps of the control method of the primary air pressure of the coal-fired generating unit according to any one of the above.

[0021] In a fifth aspect, the present application provides a computer program product, comprising a computer program, and the computer program is executed by a processor to implement the steps of the control method of the primary air pressure of the coal-fired generating unit according to any one of the above.

[0022] According to the specific embodiments provided by the present application, the present application has the following technical effects:

[0023] The present application provides a control method, system, device, medium and product of the primary air pressure of the coal-fired generating unit, which obtains real-time operation data containing the coal supply instruction, the number of coal supply machine operation and various operation conditions, to provide basic information for subsequent accurate control, solves the problem of inaccurate control caused by incomplete information acquisition, and realizes comprehensive control of the operation state of the unit. By combining the average coal supply amount-air pressure limit mapping table to determine the primary air pressure limit value, and using the correction total coal amount-air pressure candidate value mapping table with different mapping relationships to determine the candidate value group, the problem that a single control parameter cannot adapt to complex conditions is solved, and the control strategy is flexibly adjusted according to different conditions. By synthesizing the limit value and the candidate value group to obtain the target value and adjusting the related equipment, the problem of unstable control of the primary air pressure under complex conditions is solved, the stable control of the primary air pressure of the coal-fired generating unit under multiple conditions is realized, the variable load operation demand of the unit is met, and the flexibility and adaptability of the unit are enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0025] Figure 1 FIG. 1 is a diagram of the application environment of a control method of the primary air pressure of the coal-fired generating unit according to an embodiment of the present application;

[0026] Figure 2 FIG. 2 is a flowchart of a control method of the primary air pressure of the coal-fired generating unit according to an embodiment of the present application;

[0027] Figure 3 A functional module schematic diagram of a control system of a primary air pressure of a coal-fired unit provided by an embodiment of the present application is shown in FIG. 1.

[0028] Figure 4 A control strategy logic schematic diagram of a control system of a primary air pressure of a coal-fired unit provided by an embodiment of the present application is shown in FIG. 2.

[0029] Figure 5 A control strategy logic schematic diagram of a control system of a primary air pressure of a coal-fired unit provided by another embodiment of the present application is shown in FIG. 3.

[0030] Figure 6 A structural schematic diagram of a computer device provided by an embodiment of the present application is shown in FIG. 4. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0032] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0033] The control method of the primary air pressure of the coal-fired unit provided by the embodiments of the present application can be applied to, for example, Figure 1In the application environment shown, the terminal 102 communicates with the server 104 via a network. The data storage system can store data that the server 104 needs to process. The data storage system can be set up separately, integrated on the server 104, or placed on the cloud or other servers. Terminal 102 can transmit the real-time operating data of the coal-fired unit to server 104. After receiving the real-time operating data of the coal-fired unit, server 104 determines the current primary air pressure limit value based on the coal feeder's coal feed rate instruction and the number of coal feeders in operation in the real-time operating data, combined with an average coal feed rate-air pressure limit mapping table. Based on the corrected total coal quantity, a set of primary air pressure candidate values ​​at the current moment is determined using different mapping relationships of corrected total coal quantity-air pressure candidate value mapping tables. The corrected total coal quantity is obtained by dynamically correcting the coal feed rate instruction based on the operating conditions in the real-time operating data using an operating condition-compensation coefficient mapping table and a step compensation rule. Based on the current primary air pressure limit value and the set of primary air pressure candidate values, a current primary air pressure target value is obtained. Primary air system-related equipment, including primary fans, dampers, and baffles, is controlled and adjusted based on the current primary air pressure target value. Server 104 can provide feedback of the obtained current primary air pressure target value to terminal 102. In addition, in some embodiments, the method for controlling the primary air pressure of the coal-fired unit can also be implemented independently by the server 104 or the terminal 102. For example, the terminal 102 can directly perform a primary fan pressure adjustment process on the real-time operating data of the coal-fired unit, or the server 104 can obtain the real-time operating data of the coal-fired unit from the data storage system and perform a primary fan pressure adjustment process on the real-time operating data of the coal-fired unit.

[0034] The terminal 102 may be, but is not limited to, various desktop computers, laptop computers, smart phones, tablet computers, IoT devices, and portable wearable devices. The server 104 may be implemented as an independent server or a server cluster consisting of multiple servers, or a cloud server.

[0035] In an exemplary embodiment, Figure 2 As shown, a method for controlling the primary air pressure of a coal-fired unit is provided. The method is executed by a computer device, specifically a computer device such as a terminal or a server, or a terminal and a server. In the embodiment of the present application, the method is applied to Figure 1 The server 104 in FIG. 1 is taken as an example to illustrate the method, which includes the following steps 201 to 205. Among them:

[0036] In step 201, real-time operation data of the coal-fired unit is acquired; the real-time operation data includes a coal feeding amount instruction of a coal feeder, a running number of the coal feeder, and a running condition; the running condition includes a load fluctuation condition, a coal quality change condition, a unit start-stop condition, or a coal mill switching condition.

[0037] In step 202, a primary air pressure limit value at the current time is determined according to the coal feeding amount instruction of the coal feeder and the running number of the coal feeder in the real-time operation data and in combination with an average coal feeding amount-air pressure limit mapping table.

[0038] In step 203, a primary air pressure candidate value group at the current time is determined according to a corrected total coal amount through a corrected total coal amount-air pressure candidate value mapping table of different mapping relationships; the corrected total coal amount is obtained by dynamically correcting the coal feeding amount instruction based on the running condition in the real-time operation data through a condition-compensation coefficient mapping table and a step compensation rule.

[0039] In step 204, a primary air pressure target value at the current time is obtained based on the primary air pressure limit value at the current time and the primary air pressure candidate value group at the current time.

[0040] In step 205, a primary air system related device is controlled and adjusted according to the primary air pressure target value at the current time; the primary air system related device includes a primary air fan, a damper, and a baffle.

[0041] By implementing the above steps 201 to 205, the present application can realize accurate and dynamic control of the primary air pressure of the coal-fired unit. The problem of large fluctuation of the primary air pressure under complex conditions and difficult stable control is effectively solved, the stability and efficiency of the unit operation are improved, and the adaptability of the unit to different conditions is enhanced.

[0042] In another exemplary embodiment of the present application, step 202 specifically includes:

[0043] The coal feeding amount instructions of all the coal feeders at the current time are summed to obtain a coal feeding amount comprehensive value at the current time.

[0044] The running number of the coal feeder is limited to obtain a limited running number of the coal feeder at the current time.

[0045] The coal feeding amount comprehensive value at the current time is divided by the limited running number of the coal feeder at the current time to obtain an average coal feeding amount value at the current time.

[0046] The average coal feeding amount value at the current time is used to determine the primary air pressure limit value at the current time through the average coal feeding amount-air pressure limit mapping table.

[0047] In another example embodiment of the present application, the set of primary air pressure candidate values in step 203 specifically includes: a first primary air pressure candidate value and a second primary air pressure candidate value.

[0048] The first primary air pressure candidate value is obtained based on the corrected total coal amount according to a corrected total coal amount-air pressure candidate mapping relationship based on a steady state operating condition mapping relationship.

[0049] The second primary air pressure candidate value is obtained according to the corrected total coal amount according to a corrected total coal amount-air pressure candidate mapping relationship based on a dynamic operating condition mapping relationship.

[0050] In another example embodiment of the present application, step 204 specifically includes:

[0051] The real-time operating data further includes a number of operating coal mills.

[0052] The number of operating coal mills at the current time is obtained by processing the number of operating coal mills at the current time using a first-order inertia filtering algorithm.

[0053] A coal mill number change compensation value is obtained based on the corrected number of operating coal mills at the current time and the number of operating coal mills.

[0054] A comprehensive compensation value of the primary air pressure at the current time is obtained by adding the primary air fan feedforward value at the current time and the coal mill number change compensation value.

[0055] If the comprehensive compensation value of the primary air pressure at the current time is less than the first primary air pressure candidate value, the first primary air pressure candidate value is taken as the primary air pressure reference value; otherwise, the coal mill number change compensation value is taken as the primary air pressure reference value.

[0056] If the primary air pressure reference value is less than the second primary air pressure candidate value, the primary air pressure reference value is taken as the primary air pressure target value at the current time; otherwise, the second primary air pressure candidate value is taken as the primary air pressure target value at the current time.

[0057] As an optional implementation, the application can also predict the trend of the primary air pressure in a future period of time by inputting real-time data into the analysis model. According to the prediction result, the optimal parameter setting values of various types are calculated by using an optimization algorithm to maintain the primary air pressure within the set range and adapt to different working condition changes. At the same time, according to external factors such as the load instruction of the unit and the running state of the coal mill, the possible influence on the primary air pressure is predicted in advance, and the control parameters of the fan are actively adjusted to improve the overall performance and economic benefit of the unit. Among them, the change of the load instruction directly affects the output power of the unit. When the load increases, the boiler needs more fuel, and the output of the coal mill will also increase, resulting in an increase in the demand for primary air. At this time, the pressure of the primary air fan must be increased to meet the demand for more air volume. Conversely, when the load decreases, the air demand decreases, and the pressure may decrease. However, the application considers dynamic response problems, such as the speed of load change and whether the fan can adjust in time to avoid excessive pressure fluctuations affecting the stability of combustion.

[0058] The application also provides an application scenario of the control method of the primary air pressure of the coal-fired unit. Specifically, the control method of the primary air pressure of the coal-fired unit provided in the embodiment can be applied in a coal-fired power plant boiler operation control scenario, which includes a coal powder preparation and conveying link, a combustion adjustment link, and a wind and smoke system regulation link. In the coal powder preparation and conveying link, raw coal enters the coal mill to be ground into coal powder, and then is conveyed to the boiler burner by the primary air. In this process, the coal feeder adjusts the coal supply amount according to the load instruction, which directly affects the coal powder preparation amount and the demand for primary air. After entering the combustion adjustment link, the number of burners in operation and the air-coal ratio are dynamically adjusted according to the unit load demand to ensure the combustion efficiency and stability. Then, it enters the wind and smoke system regulation link. The primary air, as the key medium for coal powder conveying and combustion, needs to be accurately controlled in pressure to match the coal powder conveying demand. The control method of the primary air pressure of the coal-fired unit provided in the embodiment belongs to the primary air pressure optimization control sub-link in the wind and smoke system regulation link. Specifically, the primary air pressure limit value is first determined based on real-time operation data, and then the primary air pressure candidate value group is determined through different mapping relationships. The target value is obtained by comprehensively considering the two, and finally the primary air fan, damper and baffle and other equipment are accurately adjusted according to the target value, such as automatically adjusting the frequency converter of the primary air fan or the opening degree of the baffle to realize closed-loop control of the pressure, so as to ensure that the primary air pressure is always in the best state, improve the intelligent level and stability of the whole coal-fired power plant boiler operation control, and finally realize the application effects of dynamic response, stability improvement and energy saving and consumption reduction, and significantly improve the flexibility and economy of the unit operation.

[0059] Based on the same inventive concept, the application further provides a coal-fired unit primary air pressure control system for implementing the above-mentioned coal-fired unit primary air pressure control method. The system provides a solution to the problem similar to the solution provided in the above-mentioned method, and therefore the specific limitations in one or more coal-fired unit primary air pressure control system embodiments provided below can refer to the limitations of the coal-fired unit primary air pressure control method provided above, which will not be described here again.

[0060] In one exemplary embodiment, as shown in Figure 3 A coal-fired unit primary air pressure control system is provided, comprising:

[0061] A data acquisition unit 301 is configured to acquire real-time operation data of the coal-fired unit, wherein the real-time operation data comprises a coal feeder coal supply amount instruction, a coal feeder operation quantity, and an operation condition; and the operation condition comprises a load fluctuation condition, a coal quality change condition, a unit start-stop condition, or a coal mill switching condition.

[0062] An amplitude limiting value calculation unit 302 is configured to determine a primary air pressure amplitude limiting value at a current time based on the coal feeder coal supply amount instruction and the coal feeder operation quantity in the real-time operation data and in combination with an average coal supply amount-primary air pressure amplitude limiting mapping table.

[0063] A pressure candidate value calculation unit 303 is configured to determine a primary air pressure candidate value group at the current time by using different mapping relationship correction total coal supply amount-primary air pressure candidate value mapping tables based on a corrected total coal supply amount; the corrected total coal supply amount is obtained by dynamically correcting the coal supply amount instruction based on the operation condition in the real-time operation data by using an operation condition-compensation coefficient mapping table and a step compensation rule.

[0064] A target value determination unit 304 is configured to obtain a primary air pressure target value at the current time based on the primary air pressure amplitude limiting value at the current time and the primary air pressure candidate value group.

[0065] A control adjustment unit 305 is configured to control and adjust a primary air system related device based on the primary air pressure target value at the current time; the primary air system related device comprises a primary air fan, a damper, and a baffle.

[0066] In another exemplary embodiment of the application, the feedforward value calculation unit specifically comprises a first amplitude limiting module, a first addition module, a first division module, and a first function module.

[0067] The first amplitude limiting module and the first addition module are connected to the first division module; and the first division module is further connected to the first function module.

[0068] The first adding module is configured to sum all coal feeder coal supply amount instructions at the current time to obtain a current coal supply amount comprehensive value.

[0069] The first limiting module is configured to limit the number of running coal feeders to obtain a limited number of running coal feeders at the current time.

[0070] The first division module is configured to divide the current coal supply amount comprehensive value by the limited number of running coal feeders to obtain an average coal supply amount value at the current time.

[0071] The first function module is configured to determine a primary air pressure limiting value at the current time based on the average coal supply amount value at the current time through an average coal supply amount-air pressure limiting mapping table.

[0072] In another example embodiment of the present application, the setting value generation unit specifically includes a first first-order inertia module, a coal mill number correction module, a third adding module, a first large selection module, and a first small selection module.

[0073] The first first-order inertia module is configured to process the number of running coal mills at the current time through a first-order inertia filtering algorithm to obtain a corrected number of coal mills at the current time.

[0074] The coal mill number correction module is configured to obtain a coal mill number change compensation value based on the corrected number of coal mills at the current time and the number of running coal mills.

[0075] The third adding module is configured to add the primary air feeder value at the current time and the coal mill number change compensation value to obtain a comprehensive compensation value of the primary air pressure at the current time.

[0076] The first large selection module is configured to, if the comprehensive compensation value of the primary air pressure at the current time is less than the first primary air pressure candidate value, take the first primary air pressure candidate value as a primary air pressure reference value; otherwise, take the coal mill number change compensation value as the primary air pressure reference value.

[0077] The first small selection module is configured to, if the primary air pressure reference value is less than the second primary air pressure candidate value, take the primary air pressure reference value as a primary air pressure target value at the current time; otherwise, take the second primary air pressure candidate value as the primary air pressure target value at the current time.

[0078] In another example embodiment of the present application, as Figure 4As shown, the control strategy logic of the control system of the primary air pressure of the coal-fired unit is provided, specifically comprising: A coal feeder coal supply instruction (001), A coal feeder is running (002), B coal feeder coal supply instruction (003), B coal feeder is running (004), C coal feeder coal supply instruction (005), C coal feeder is running (006), D coal feeder coal supply instruction (007), D coal feeder is running (008), E coal feeder coal supply instruction (009), E coal feeder is running (010), F coal feeder coal supply instruction (011), F coal feeder is running (012), the number of running coal feeders (013), the first switching module (014), the second switching module (015), the third switching module (016), the fourth switching module (017), the fifth switching module (018), the sixth switching module (019), the first limiting module (020), the first addition module (021), the first division module (022), the first function module (023), the primary air pressure limiting value (024).

[0079] A coal feeder coal supply instruction (001) and A coal feeder is running (002) correspond to the "PV1" end and the "S" end connected to the first switching module (014) respectively, B coal feeder coal supply instruction (003) and B coal feeder is running (004) correspond to the "PV1" end and the "S" end connected to the second switching module (015) respectively, C coal feeder coal supply instruction (005) and C coal feeder is running (006) correspond to the "PV1" end and the "S" end connected to the third switching module (016) respectively, D coal feeder coal supply instruction (007) and D coal feeder is running (008) correspond to the "PV1" end and the "S" end connected to the fourth switching module (017) respectively, E coal feeder coal supply instruction (009) and E coal feeder is running (010) correspond to the "PV1" end and the "S" end connected to the fifth switching module (018) respectively, F coal feeder coal supply instruction (011) and F coal feeder is running (012) correspond to the "PV1" end and the "S" end connected to the sixth switching module (019) respectively, the output end of the first switching module (014), the output end of the second switching module (015), the output end of the third switching module (016), the output end of the fourth switching module (017), the output end of the fifth switching module (018), the output end of the sixth switching module (019) are all connected to the first addition module (021), the number of running coal feeders (013) is connected to the first limiting module (020), the output end of the first addition module (021) and the output end of the first limiting module (020) are all connected to the first division module (022), the output end of the first division module (022) is connected to the first function module (023) and the primary air pressure set value before limiting (024) in turn.

[0080] The first to sixth switch modules (014) to (019) are used for outputting the value of the "Pv1" terminal when the "S" terminal is 0, and outputting the value of the "Pv2" terminal when the "S" terminal is 1.

[0081] The first limiting module (020) is used for limiting the upper and lower limits of the input value, so that the output value is always within the set upper and lower limit range.

[0082] The first function module (023) is used for inputting the value to pass through the input and output corresponding function curve relationship set in the module, and outputting the corresponding output value.

[0083] In another exemplary embodiment of the present application, as shown in Figure 5 The control strategy logic diagram of the control system of the coal-fired unit primary air pressure is provided, and specifically includes: a primary air pressure limiting value (024), a primary air fan feedforward value (025), a corrected total coal quantity (026), a number of coal mills in operation (027), a second function module (028), a third function module (029), a first first-order inertia module (030), a coal mill number correction module (including a first subtraction module (031), a first greater-than comparison module (033), a first pulse module (035) and a seventh switch module (036)), a second first-order inertia module (032), a second addition module (034), a third addition module (037), a first maximum selection module (038), a first minimum selection module (039) and a primary air pressure self-adaptation (040).

[0084] The primary air pressure limiting value (024) is connected to the second first-order inertia module (032), the primary air fan feedforward value (025) and the output end of the second first-order inertia module (032) are both connected to the second addition module (034), the mill operation quantity (027) is connected to the first first-order inertia module (030), the mill operation quantity (027) and the output end of the first first-order inertia module (030) are both connected to the first subtraction module (031), the output end of the first subtraction module (031) is connected to the first greater than comparison module (033), the output end of the first greater than comparison module (033) is connected to the first pulse module (035), the output end of the first pulse module (035) is connected to the "S" end of the seventh switch module (036), the output end of the second addition module (034) and the output end of the seventh switch module (036) are both connected to the third addition module (037), the corrected total coal quantity (026) is connected to the second function module (028), the output end of the second function module (028) and the output end of the third addition module (037) are both connected to the first greater than selection module (038), the corrected total coal quantity (026) is connected to the third function module (029), the output end of the third function module (029) and the output end of the first greater than selection module (038) are both connected to the first less than selection module (039), and the output end of the first less than selection module (039) is connected to the primary air pressure self-adaption (040).

[0085] The second function module (028) represents that the input value passes through the input and output corresponding function curve relationship set inside the module, and outputs the corresponding output value; and the third function module (029) represents that the input value passes through the input and output corresponding function curve relationship set inside the module, and outputs the corresponding output value.

[0086] The first first-order inertia module (030) represents that the first-order inertia link is a link that the output response of a system is proportional to the change rate of an input signal, but there is a lag phenomenon. The output change rate is slower than the change rate of the input signal, and reflects the inertia caused by the combination of energy storage elements (such as inductance, capacitance) and energy consumption elements (such as resistance, damper) of the system. The second first-order inertia module (032) represents that the first-order inertia link is a link that the output response of a system is proportional to the change rate of an input signal, but there is a lag phenomenon. The output change rate is slower than the change rate of the input signal, and reflects the inertia caused by the combination of energy storage elements (such as inductance, capacitance) and energy consumption elements (such as resistance, damper) of the system.

[0087] The first greater than comparison module (033) represents that all input ends are compared in greater than. If input end 1 is greater than input end 2, then the output is 1, and if input end 1 is less than input end 2, then the output is 0.

[0088] The first pulse module (035) represents the function of completing the output fixed-width high-level pulse.

[0089] The seventh switching module (036) represents that when the "S" end is 0, the output is the value of the "Pv1" end, and when the "S" end is 1, the output is the value of the "Pv2" end.

[0090] The first maximum selection module (038) represents that all input ends are compared to select the maximum value, and the output is the maximum value of the input end. The first minimum selection module (039) represents that all input ends are compared to select the minimum value, and the output is the minimum value of the input end.

[0091] In another exemplary embodiment of the present application, a self-adaptive control method for the primary air pressure of a coal-fired unit is provided, and the specific implementation process is as follows:

[0092] (1) First, the running states of the A coal feeder (002), the B coal feeder (004), the C coal feeder (006), the D coal feeder (008), the E coal feeder (010), and the F coal feeder (012) are sequentially and comprehensively judged. If the A coal feeder is running (002) and the running state is 1 at this time, the first switching module (014) outputs the A coal feeder coal supply instruction (001), and otherwise 0. If the B coal feeder is running (004) and the running state is 1 at this time, the second switching module (015) outputs the B coal feeder coal supply instruction (003), and otherwise 0. If the C coal feeder is running (006) and the running state is 1 at this time, the third switching module (016) outputs the C coal feeder coal supply instruction (005), and otherwise 0. If the D coal feeder is running (008) and the running state is 1 at this time, the fourth switching module (017) outputs the D coal feeder coal supply instruction (007), and otherwise 0. If the E coal feeder is running (010) and the running state is 1 at this time, the fifth switching module (018) outputs the E coal feeder coal supply instruction (009), and otherwise 0. If the F coal feeder is running (012) and the running state is 1 at this time, the sixth switching module (019) outputs the F coal feeder coal supply instruction (011), and otherwise 0. The coal supply instructions of all coal feeders are summed by the first addition module (021).

[0093] (2) The output value of the first addition module (021) is divided by the value of the running coal feeder number (013) after the first limiting module (020) by the first division module (022). The output end of the first division module (022) is calculated by the first function module (023) to obtain the primary air pressure limiting value (024).

[0094] The average coal supply value and the primary air fan feed value before the primary air pressure setting value limit are adaptively changed according to the coal supply comprehensive instruction of the coal feeder. The mapping relationship between the average coal supply value and the primary air fan feed value based on the coal supply instruction of the coal feeder and the average coal supply value calculated by the running number of the coal feeder is shown in Table 1.

[0095] Table 1 Mapping relationship between average coal supply value and primary air fan feed value

[0096] Average coal supply value (t / h) 0 10 20 40 46 50 55 63 67 70 100 Primary air pressure set value before limit (kPa) 6.5 6.5 6.5 6.5 7 7.4 7.8 8.5 8.8 8.8 8.8

[0097] (3) The result of the adaptively changed total coal quantity (026) after the second function module (028) is applied to the first large selection module (038). The first type of mapping relationship between the corrected total coal quantity and the first primary air pressure candidate value is shown in Table 2.

[0098] Table 2 First type of corrected total coal quantity-air pressure candidate mapping relationship

[0099] Corrected total coal amount (t) 0 10 20 100 150 200 400 Second function module (028) primary air pressure set value (kPa) 4 4 7 7 7.5 8 8

[0100] (4) The result of the adaptively changed total coal quantity (026) after the third function module (029) is applied to the first small selection module (039). The second type of mapping relationship between the corrected total coal quantity and the second primary air pressure candidate value is shown in Table 3.

[0101] Table 3 Second type of corrected total coal quantity-air pressure candidate mapping relationship

[0102] Corrected total coal amount (t) 0 100 150 200 400 Third function module (029) primary air pressure set value (kPa) 9 9 9.5 10 10

[0103] (5) The value of the running number of the coal mill (027) after the first first-order inertia module (030) is calculated by the first subtraction module (031) after the running number of the coal mill (027) is calculated, and the output value is compared with the preset comparison threshold (0.1 here) using the first greater than comparison module (033). After the first pulse module (035), it is applied to the "S" end of the seventh switching module (036). If the "S" end of the seventh switching module (036) is 1, the seventh switching module (036) outputs the value of the "PV1" end (0.3 here). If the "S" end of the seventh switching module (036) is 0, the seventh switching module (036) outputs the value of the "PV2" end (0 here). The seventh switching module (036), the primary air fan feed value (025) and the primary air pressure limit value (024) are added by the third addition module (037). The output value is compared with the primary air pressure setting of the second function module (028); the output value is compared with the primary air pressure setting of the third function module (029); and the final output value is the primary air pressure self-adaptation (040).

[0104] The application has at least the following beneficial technical effects:

[0105] 1、The coal-fired unit multi-condition primary air pressure set value self-adaptive control system provided by the application comprehensively considers the relationship between multiple variables such as primary air pressure, flow, temperature, and performs multi-variable coordinated control. By establishing a multi-variable control system, the optimization control of the primary air fan pressure set value is realized, so that the system can ensure stable operation while achieving the best operating efficiency. The pressure, flow and temperature of the primary air of the coal-fired unit need to be optimized through multi-variable coordinated control. The pressure is the driving force of the flow, and the temperature indirectly affects the relationship between the two through density and combustion efficiency, and the complexity of control is further increased by the wind-coal ratio, load response and safety constraints.

[0106] 2、The coal-fired unit multi-condition primary air pressure set value self-adaptive control method provided by the application calculates the pressure demand of the primary air fan according to the load instruction and the change trend of the boiler. When the boiler load increases, the output of the coal mill needs to be increased accordingly, at which time the primary air fan pressure set value should be increased in advance to meet the increased air volume demand.

[0107] In summary, the coal-fired unit multi-condition primary air pressure set value self-adaptive control method and system described in the application can enhance the flexibility and adaptability of the unit. Whether it is the start and stop of the unit, the rapid change of the load, or the complex working condition change of the coal mill, the self-adaptive control can quickly respond, maintain the stability of the primary air fan pressure, and meet the demand of the unit variable load operation.

[0108] In an exemplary embodiment, a computer device, which can be a server or a terminal, is provided, and an internal structure diagram thereof can be as shown in Figure 6 The computer device includes a processor, a memory, an input / output interface (I / O) and a communication interface. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store primary air pressure processing data. The input / output interface of the computer device is used to exchange information between the processor and external devices. The communication interface of the computer device is used to communicate with external terminals through network connection. The computer program is executed by the processor to implement a control method for the primary air pressure of a coal-fired unit.

[0109] Those skilled in the art can understand that,Figure 6 The structure shown in the figure is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the computer device to which the scheme of the present application is applied. The specific computer device can include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components. In an exemplary embodiment, a computer device is provided, including a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the steps in the above method embodiments.

[0110] In an exemplary embodiment, a computer readable storage medium is provided, storing a computer program, which is executed by a processor to implement the steps in the above method embodiments.

[0111] In an exemplary embodiment, a computer program product is provided, including a computer program, which is executed by a processor to implement the steps in the above method embodiments.

[0112] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the present application are all information and data authorized by the user or authorized by all parties, and the collection, use and processing of related data need to comply with relevant regulations.

[0113] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when executed, can include the processes of the above-mentioned embodiment methods. Any reference to memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ReadOnly Memory, ROM), magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive random access memory (Resistive Random Access Memory, ReRAM), magnetoresistive random access memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric memory (Ferroelectric Random Access Memory, FRAM), phase change memory (Phase Change Memory, PCM), graphene memory, etc. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, etc. As an illustration but not limitation, RAM can be in various forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), etc.

[0114] The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a blockchain, etc., without being limited thereto. The processor involved in the embodiments provided in the present application can be a general processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., without being limited thereto.

[0115] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the present application.

[0116] The principles and implementation manners of the present application are described herein by using specific examples, and the above examples are only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manners and application ranges will have changes. In conclusion, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A method for controlling the primary air pressure of a coal-fired unit, characterized in that: The method for controlling the primary air pressure of a coal-fired unit includes: Acquire real-time operating data of the coal-fired unit; the real-time operating data includes coal feeder coal feed quantity instructions, number of coal feeder operations, and operating conditions; the operating conditions include load fluctuation conditions, coal quality change conditions, unit start-up and shutdown conditions, or pulverizer switching conditions; Determining the primary wind pressure limit value at the current moment according to the coal feed rate instruction of the coal feeder and the number of coal feeder operations in the real-time operation data and in combination with the average coal feed rate-wind pressure limit mapping table; According to the corrected total coal quantity, a primary air pressure candidate value group at the current moment is determined using corrected total coal quantity-air pressure candidate value mapping tables with different mapping relationships; the corrected total coal quantity is obtained by dynamically correcting the coal feed quantity instruction based on the operating conditions in the real-time operating data using the operating condition-compensation coefficient mapping table and the step compensation rule; Obtaining a primary wind pressure target value at the current moment based on the primary wind pressure limit value at the current moment and the primary wind pressure candidate value group; The primary air system related equipment is controlled and adjusted according to the primary air pressure target value at the current moment; the primary air system related equipment includes the primary fan, damper and baffle.

2. The method for controlling the primary air pressure of a coal-fired unit according to claim 1, characterized in that: According to the coal feed rate instruction of the coal feeder and the number of coal feeder operations in the real-time operation data, combined with the average coal feed rate-wind pressure limit mapping table, the primary wind pressure limit value at the current moment is determined, specifically including: The coal feeding instructions of all coal feeders at the current moment are summed up to obtain the comprehensive value of the coal feeding amount at the current moment; Performing a limit process on the number of running coal feeders to obtain the number of running coal feeders after the limit at the current moment; Divide the current comprehensive value of coal feeding by the number of coal feeders in operation after limiting to obtain the current average coal feeding value; Based on the average coal feed value at the current moment, the primary wind pressure limit value at the current moment is determined through the average coal feed value-wind pressure limit mapping table.

3. The method for controlling the primary air pressure of a coal-fired unit according to claim 1, characterized in that: The primary air pressure candidate value group specifically includes: a first primary air pressure candidate value and a second primary air pressure candidate value; The first primary air pressure candidate value is obtained based on the corrected total coal quantity and the first type of corrected total coal quantity-air pressure candidate mapping relationship; The second primary air pressure candidate value is obtained according to the corrected total coal quantity and the second type of corrected total coal quantity-air pressure candidate mapping relationship.

4. The method for controlling the primary air pressure of a coal-fired unit according to claim 1, characterized in that: Obtaining a primary wind pressure target value at the current moment based on the primary wind pressure limit value at the current moment and the primary wind pressure candidate value group specifically includes: The real-time operation data also includes the primary fan feedforward value and the number of coal mill operations; The corrected number of coal mills at the current moment is obtained by processing the number of coal mills in operation at the current moment using the first-order inertial filtering algorithm; Based on the corrected number of coal mills and the number of coal mills in operation at the current moment, a compensation value for the change in the number of coal mills is obtained; The current primary air fan feedforward value, the primary air pressure limit value and the coal mill quantity change compensation value are added together to obtain the comprehensive compensation value of the primary air pressure at the current moment; If the comprehensive compensation value of the primary air pressure at the current moment is less than the first candidate primary air pressure value, the first candidate primary air pressure value is used as the primary air pressure reference value; otherwise, the compensation value for the change in the number of coal mills is used as the primary air pressure reference value; If the primary air pressure reference value is less than the second primary air pressure candidate value, the primary air pressure reference value is used as the primary air pressure target value at the current moment; otherwise, the second primary air pressure candidate value is used as the primary air pressure target value at the current moment.

5. A control system for primary air pressure of a coal-fired unit, characterized in that: The control system of the primary air pressure of a coal-fired unit applies the control method of the primary air pressure of a coal-fired unit according to any one of claims 1 to 4, and the control system of the primary air pressure of the coal-fired unit comprises: A data acquisition unit is used to obtain real-time operating data of the coal-fired unit; the real-time operating data includes coal feeder coal feed rate instructions, the number of coal feeder operations, and operating conditions; the operating conditions include load fluctuation conditions, coal quality change conditions, unit start-up and shutdown conditions, or pulverizer switching conditions; a limit value calculation unit, configured to determine the primary wind pressure limit value at the current moment according to the coal feed rate instruction of the coal feeder and the number of coal feeder operations in the real-time operation data, in combination with an average coal feed rate-wind pressure limit mapping table; a pressure candidate value calculation unit, configured to determine a primary air pressure candidate value group at the current moment based on the corrected total coal quantity, using corrected total coal quantity-air pressure candidate value mapping tables with different mapping relationships; the corrected total coal quantity is obtained by dynamically correcting the coal feed quantity instruction based on the operating conditions in the real-time operating data, using the operating condition-compensation coefficient mapping table and the step compensation rule; a target value determining unit, configured to obtain a primary wind pressure target value at a current moment based on the primary wind pressure limit value at a current moment and the primary wind pressure candidate value group; The control and adjustment unit is used to control and adjust the primary air system related equipment according to the primary air pressure target value at the current moment; the primary air system related equipment includes a primary fan, damper and baffle.

6. The primary air pressure control system of a coal-fired unit according to claim 5, characterized in that: The feedforward value calculation unit specifically includes: a first limiting module, a first adding module, a first dividing module and a first function module; The first limiting module and the first adding module are respectively connected to the first dividing module; the first dividing module is also connected to the first function module; The first adding module is used to perform a sum operation on the coal feeding amount instructions of all coal feeders at the current moment to obtain a comprehensive value of the coal feeding amount at the current moment; The first limiting module is used to limit the number of running coal feeders to obtain the number of running coal feeders after limiting at the current moment; The first division module is used to divide the comprehensive value of the coal feeding amount at the current moment by the number of coal feeders in operation after limiting to obtain the average coal feeding amount value at the current moment; The first function module is used to determine the primary wind pressure limit value at the current moment based on the average coal feed value at the current moment through an average coal feed-wind pressure limit mapping table.

7. The primary air pressure control system of a coal-fired unit according to claim 5, characterized in that: The set value generating unit specifically includes: a first first-order inertia module, a coal mill quantity correction module, a third addition module, a first large selection module and a first small selection module; The first first-order inertia module is used to process the number of coal mills in operation at the current moment using a first-order inertia filtering algorithm to obtain a corrected number of coal mills at the current moment; The coal mill quantity correction module is used to obtain a coal mill quantity change compensation value based on the corrected coal mill quantity and the number of coal mills in operation at the current moment; The third adding module is used to add the primary fan feedforward value, the primary air pressure limit value and the coal mill quantity change compensation value at the current moment to obtain a comprehensive compensation value of the primary air pressure at the current moment; The first selection module is configured to use the first candidate primary air pressure value as the primary air pressure reference value if the comprehensive compensation value of the primary air pressure at the current moment is less than the first candidate primary air pressure value; otherwise, use the compensation value for the change in the number of coal mills as the primary air pressure reference value; The first small selection module is used to use the primary wind pressure reference value as the primary wind pressure target value at the current moment if the primary wind pressure reference value is less than the second primary wind pressure candidate value; otherwise, use the second primary wind pressure candidate value as the primary wind pressure target value at the current moment.

8. A computer device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method for controlling the primary air pressure of a coal-fired unit according to any one of claims 1 to 4.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for controlling the primary air pressure of a coal-fired unit according to any one of claims 1 to 4 is implemented.

10. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the method for controlling the primary air pressure of a coal-fired unit according to any one of claims 1 to 4 is implemented.

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