Coal mill primary air volume control method and device, medium, equipment and program product

Abstract

The invention relates to a coal mill primary air volume control method and device, a medium, equipment and a program product, and relates to the field of coal mill control. Comprising the following steps: determining a primary air speed first instruction of the coal mill according to the primary air speed of each of a plurality of outlets of the coal mill; determining a primary air speed second instruction of the coal mill according to a coal feeding instruction of the coal feeder; determining a primary air control instruction of the coal mill according to the primary air speed first instruction and / or the primary air speed second instruction; and adjusting the opening degree of a hot air control valve of the coal mill according to the primary air control instruction so as to control the primary air volume of an inlet of the coal mill. The primary air volume of the inlet of the coal mill is adjusted through the primary air speed of the outlet of the coal mill, the condition that the primary air volume of the coal mill and the load of the coal mill are synchronous can be better maintained, and therefore the possibility that faults occur in the working process of the coal mill is reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of coal mill control, and in particular, to a method, device, medium, equipment and program product for controlling primary air volume of a coal mill. Background Art

[0002] The control of the primary air volume of the coal mill requires that the coal powder can respond quickly to the load change on the one hand, and on the other hand, it must be able to ensure the safe operation of the coal mill. If the primary air volume is too small, it may cause the coal mill to grind stiff, burn the nozzle, or cause coal powder to deposit and self-ignite in some areas; if the primary air volume is too large, the exhaust gas temperature will increase, the boiler efficiency will decrease, and the wear of the primary air duct and the power consumption of the primary air fan will increase. Therefore, the control of the primary air volume of the coal mill must be synchronized with the load in real time to ensure the economic and safe operation of the boiler; however, the primary air volume measurement points of many power plant coal mills cannot be accurately measured due to the limited space of the coal mill inlet duct, the installation location of the measurement point, and the easy blockage of the measurement point itself. At the same time, since the primary air volume actually measures the air volume at the inlet of the coal mill, it also includes the sealing air of the coal mill and the coal feeder. This part of the air changes with the change of the operating conditions of the coal mill. Therefore, the primary air volume measurement point cannot accurately reflect the actual primary air volume inside the coal mill, resulting in the coal mill primary air volume and load being out of sync, thereby increasing the possibility of mechanical failure during the operation of the coal mill. Summary of the invention

[0003] In order to overcome the problems existing in the related art, the present disclosure provides a coal mill primary air volume control method, device, medium, equipment and program product.

[0004] According to a first aspect of an embodiment of the present disclosure, a method for controlling primary air volume of a coal mill is provided, comprising: Determining a first primary wind speed instruction of the coal mill according to the primary wind speed of each outlet of the plurality of outlets of the coal mill; Determining a second primary wind speed instruction of the coal mill according to a coal feeding instruction of the coal feeder; Determining a primary air control instruction of the coal mill according to the first primary air speed instruction and / or the second primary air speed instruction; The hot air damper opening of the coal mill is adjusted according to the primary air control instruction to control the primary air volume at the inlet of the coal mill.

[0005] Optionally, determining the second primary wind speed instruction of the coal mill according to the coal feeding instruction of the coal feeder includes: The second primary wind speed instruction is determined according to the coal feeding type and coal feeding amount of the coal mill; the coal feeding instruction includes the coal feeding type and coal feeding amount.

[0006] Optionally, after determining the second primary wind speed instruction of the coal mill according to the coal feeding instruction of the coal feeder, the method further includes: Obtaining a manually input wind speed correction instruction in the coal mill; The first wind speed second instruction is corrected according to the wind speed correction instruction.

[0007] Optionally, determining the primary air control instruction of the coal mill according to the first primary wind speed instruction and / or the second primary wind speed instruction includes: Determining a deviation value between the primary wind speed first instruction and the primary wind speed second instruction; The primary air control instruction is determined according to the coal feeding instruction and the deviation value.

[0008] Optionally, the method further comprises: When the primary wind speed at the first outlet of the coal mill is less than a wind speed threshold, the primary wind control instruction is corrected according to the primary wind speed; the first outlet is any one of the multiple outlets of the coal mill.

[0009] Optionally, the method further comprises: Determining whether the coal mill meets the condition of correcting the primary air control instruction according to the cold air damper; When the conditions are met, the primary air control instruction is corrected according to the cold air damper of the coal mill.

[0010] Optionally, the condition for correcting the primary air control instruction according to the cold air threshold includes: The cold air regulating valve and the hot air regulating valve of the coal mill are in automatic control mode; The cold air valve correction function of the coal mill is in operation mode; The cold air adjustment valve instruction value of the cold air adjustment valve is greater than the cold air adjustment valve correction value; The average value of the primary wind speeds at the multiple outlets of the coal mill is greater than or equal to the first wind speed threshold; The primary wind speed at any outlet of the multiple outlets of the coal mill is greater than the second wind speed threshold.

[0011] Optionally, when the condition is met, the primary air control instruction is corrected according to the cold air damper of the coal mill, including: Determine a deviation value between a cold air damping valve instruction value and a cold air damping valve correction value of the coal mill cold air damping valve; The primary air control instruction is modified according to the deviation value.

[0012] Optionally, the method further comprises: When any one of the following conditions is met, the correction of the primary air control instruction according to the cold air damper is stopped: The cold air regulating valve and hot air regulating valve of the coal mill are in manual control mode; The cold air valve adjustment correction function of the coal mill is in the exit mode; The cold air damping valve instruction value of the cold air damping valve is less than or equal to the cold air damping valve correction value; The average value of the primary wind speeds at the multiple outlets of the coal mill is less than the first wind speed threshold; The primary wind speed of any outlet of the coal mill is less than or equal to the second wind speed threshold; The change in the average value of the primary wind speeds at the multiple outlets of the coal mill is greater than or equal to the third wind speed threshold.

[0013] According to a second aspect of an embodiment of the present disclosure, a primary air volume control device for a coal mill is provided, comprising: A first determination module, configured to determine a first primary wind speed instruction of the coal mill according to a primary wind speed of each outlet of a plurality of outlets of the coal mill; A second determination module, configured to determine a second primary wind speed instruction of the coal mill according to a coal feeding instruction of the coal feeder; A third determination module, configured to determine a primary air control instruction of the coal mill according to the first primary air speed instruction and / or the second primary air speed instruction; A control module is used to adjust the hot air damper opening of the coal mill according to the primary air control instruction to control the primary air volume at the inlet of the coal mill.

[0014] According to a third aspect of an embodiment of the present disclosure, a computer-readable storage medium is provided, on which computer program instructions are stored. When the program instructions are executed by a processor, the steps of the coal mill primary air volume control method provided in the first aspect of the present disclosure are implemented.

[0015] According to a fourth aspect of an embodiment of the present disclosure, there is provided an electronic device, including: a memory having a computer program stored thereon; A processor is used to execute the computer program in the memory to implement the steps of the coal mill primary air volume control method provided in the first aspect of the present disclosure.

[0016] According to a fifth aspect of an embodiment of the present disclosure, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the steps of the coal mill primary air volume control method provided in the first aspect of the present disclosure.

[0017] Through the above technical scheme, the first primary wind speed instruction of the coal mill is determined according to the primary wind speed of each of the multiple outlets of the coal mill; the second primary wind speed instruction of the coal mill is determined according to the coal feeding instruction of the coal feeder; the primary wind control instruction of the coal mill is determined according to the first primary wind speed instruction and / or the second primary wind speed instruction; the hot air damper opening of the coal mill is adjusted according to the primary wind control instruction to control the primary air volume at the inlet of the coal mill. By adjusting the primary air volume at the inlet of the coal mill through the primary wind speed at the outlet of the coal mill, the synchronization between the primary air volume of the coal mill and the load of the coal mill can be better maintained, thereby reducing the possibility of failure during the operation of the coal mill.

[0018] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 The present invention is a flow chart of a method for controlling primary air volume of a coal mill according to an exemplary embodiment.

[0020] Figure 2 The present invention is a flow chart of a method for controlling primary air volume of a coal mill according to an exemplary embodiment.

[0021] Figure 3 The present invention is a flow chart of a method for controlling primary air volume of a coal mill according to an exemplary embodiment.

[0022] Figure 4 The present invention is a flow chart of a method for controlling primary air volume of a coal mill according to an exemplary embodiment.

[0023] Figure 5 The present invention is a flow chart of a method for controlling primary air volume of a coal mill according to an exemplary embodiment.

[0024] Figure 6 The present invention is a flow chart of a method for controlling primary air volume of a coal mill according to an exemplary embodiment.

[0025] Figure 7 The present invention is a flow chart of a method for controlling primary air volume of a coal mill according to an exemplary embodiment.

[0026] Figure 8 is a schematic diagram of a coal mill primary air volume control device 800 according to an exemplary embodiment.

[0027] Fig. 9 is a schematic diagram of an electronic device 900 according to an exemplary embodiment. DETAILED DESCRIPTION

[0028] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0029] It should be noted that all actions of acquiring signals, information or data in the present disclosure are carried out in compliance with the relevant data protection laws and policies of the country where the device is located and with the authorization given by the owner of the corresponding device.

[0030] Figure 1 FIG. 1 is a flow chart showing a method for controlling the primary air volume of a coal mill according to an exemplary embodiment. Figure 1 As shown, the method comprises the following steps: In step S101, a first primary wind speed instruction of the coal mill is determined according to the primary wind speed of each of the multiple outlets of the coal mill.

[0031] For example, the main function of the coal mill is to grind the raw coal into coal powder that meets the combustion requirements. During the operation of the coal mill, the coal powder is prepared through the grinding and separation of the coal mill, and is transported to the subsequent combustion system or storage facility through the outlet of the coal mill. The control of the primary air at the inlet of the coal mill is crucial to ensure the efficiency of boiler combustion and the safe operation of the coal mill itself. The primary air can transport the coal powder from the coal mill to the furnace, and can also dry the coal powder to ensure that the coal powder can be burned; in addition, the control of the primary air at the inlet of the coal mill can affect the temperature of the air-coal mixture at the outlet of the coal mill, as well as the primary air at the outlet of the coal mill, thereby affecting the combustion efficiency and the safety of the coal mill. It can be seen that the primary air at the inlet of the coal mill is closely related to the primary air at the outlet of the coal mill. Therefore, the primary air at the inlet of the coal mill can be dynamically adjusted according to the primary air at the outlet of the coal mill.

[0032] The coal mill has multiple outlets, each of which is equipped with a wind speed measuring device for measuring the primary wind speed at each outlet of the coal mill. The first primary wind speed instruction of the coal mill can be determined based on the primary wind speed at each outlet. The first primary wind speed instruction refers to the control instruction for the primary air at the coal mill inlet determined based on the primary wind speed at the coal mill outlet. At this time, the hot air damper of the coal mill can be controlled based on the first primary wind speed instruction to control the primary air at the coal mill inlet.

[0033] Taking a 330MW coal-fired boiler direct-blowing pulverizing system as an example, when the coal mill of the system includes four outlets, the first primary wind speed instruction at the inlet of the coal mill can be determined according to the primary wind speeds of the four outlets; for example, at the primary wind speed measurement point of each of the four outlets of the coal mill, after 5 seconds of filtering, the primary wind speed corresponding to the outlet is obtained; after determining the primary wind speed corresponding to the four outlets, the average value of the primary wind speeds corresponding to the four outlets can be multiplied by a specified coefficient as the first primary wind speed instruction; wherein, filtering can remove instantaneous fluctuations and noise in the wind speed readings caused by turbulence of the air flow inside the air duct or external environmental factors, which can ensure that the primary wind speed measurement value is more stable, reduce the measurement error caused by sudden changes in wind speed, and thus improve the reliability and stability of the data.

[0034] In addition, in step S101, the following steps may be included: Obtaining the primary wind speed of each outlet of the coal mill multiple outlets to obtain multiple primary wind speeds; Performing data processing on the multiple primary wind speeds, wherein the data processing is used to filter out abnormal values ​​in the multiple primary wind speeds; The first primary wind speed instruction is determined according to an average value of the plurality of primary wind speeds after the data processing.

[0035] In step S102, a second primary wind speed instruction of the coal mill is determined according to the coal feeding instruction of the coal feeder.

[0036] Exemplarily, the primary air in the coal mill is used to dry the coal powder and transport the coal powder from the coal mill to the furnace. Therefore, the second primary air speed instruction at the coal mill inlet can be determined according to the coal feeding instruction of the coal mill. The coal feeding instruction may include the coal feeding amount and / or the coal feeding type. For example, the coal feeding instruction of the coal feeder can be converted into the corresponding second primary air speed instruction via a function.

[0037] In step S103, a primary air control instruction of the coal mill is determined according to the first primary air speed instruction and / or the second primary air speed instruction.

[0038] For example, when the primary air volume at the coal mill inlet is too low, it may cause the primary air duct to be blocked by powder or the coal mill to be blocked by coal, or even cause the pulverizing system to explode; when the primary air volume of the coal mill is too high, it may increase the energy consumption of the primary fan and reduce the boiler efficiency. Therefore, the primary air control of the coal mill is crucial to the safe operation of the coal mill. In addition, the primary air control of the coal mill is a dynamically changing process, and the primary air volume of the coal mill may be affected by one or more factors. The changes in the primary wind speed at the coal mill inlet and the primary wind speed at the coal mill outlet determine the working state, coal grinding conditions, coal quantity changes, etc. inside the coal mill; therefore, the primary air at the coal mill inlet can be controlled according to the primary wind speed at the coal mill outlet, that is, the primary air control instruction of the coal mill is determined according to the first primary wind speed instruction; or, the primary air at the coal mill inlet can be controlled according to the change in the coal quantity in the coal mill, that is, the primary air control instruction of the coal mill is determined according to the second primary wind speed instruction; or, the primary air at the coal mill inlet can be controlled jointly according to the primary wind speed at the coal mill outlet and the change in the coal quantity in the coal mill, that is, the primary air control instruction of the coal mill is determined according to the first primary wind speed instruction and the second primary wind speed instruction. For example, the primary air control instruction can be determined according to the average value of the first primary wind speed instruction and the second primary wind speed instruction; or, the primary air control instruction can be determined according to the maximum value of the first primary wind speed instruction and the second primary wind speed instruction.

[0039] In step S104, the hot air damper opening of the coal mill is adjusted according to the primary air control instruction to control the primary air volume at the inlet of the coal mill.

[0040] Exemplarily, the primary air control of the coal mill mainly relies on the opening adjustment of the hot air damper of the coal mill. The hot air damper controls the temperature and air volume of the primary air by adjusting the proportion of hot air in the primary air entering the coal mill. Among them, adjusting the opening of the hot air damper of the coal mill through the primary air control instruction can automatically adjust the opening of the hot air damper through the control logic. When the measured value of the primary air volume at the inlet of the coal mill is greater than the set value of the primary air volume in the primary air control instruction, it means that the hot air proportion is too high or the total amount of primary air is too large. The opening of the hot air damper can be reduced to reduce the hot air proportion and the primary air volume; when the measured value of the primary air volume at the inlet of the coal mill is less than the set value of the primary air volume in the primary air control instruction, it means that the hot air proportion is too low or the total amount of primary air is small. The opening of the hot air damper can be increased to increase the hot air proportion and the primary air volume.

[0041] Through the above technical scheme, the first primary wind speed instruction of the coal mill is determined according to the primary wind speed of each of the multiple outlets of the coal mill; the second primary wind speed instruction of the coal mill is determined according to the coal feeding instruction of the coal feeder; the primary wind control instruction of the coal mill is determined according to the first primary wind speed instruction and / or the second primary wind speed instruction; the hot air damper opening of the coal mill is adjusted according to the primary wind control instruction to control the primary air volume at the inlet of the coal mill. By adjusting the primary air volume at the inlet of the coal mill through the primary wind speed at the outlet of the coal mill, the synchronization between the primary air volume of the coal mill and the load of the coal mill can be better maintained, thereby reducing the possibility of failure during the operation of the coal mill.

[0042] Figure 2 FIG. 1 is a flow chart showing a method for controlling the primary air volume of a coal mill according to an exemplary embodiment. Figure 2 As shown, step S102 includes the following steps: In step S1021, the second primary wind speed instruction is determined according to the coal feeding type and coal feeding amount of the coal mill; the coal feeding instruction includes the coal feeding type and coal feeding amount.

[0043] For example, the inlet and outlet of the coal mill can be regarded as an isenthalpic change process (no heat generation, work), and the heat loss is approximately equal to the heat loss energy of mechanical work, which is very small and can be ignored. Therefore, it can be considered that the total heat of the coal mill inlet = the total heat of the coal mill outlet, that is, the heat of coal at the coal mill inlet + the heat of air at the coal mill inlet = the heat of coal powder at the coal mill outlet + the heat of air at the coal mill outlet; Among them, the heat of coal at the coal mill inlet = the heat of other components in the coal at the coal mill inlet + the heat of water at the coal mill inlet; Water heat at coal mill inlet = water enthalpy at coal mill inlet × moisture content of coal at coal mill inlet; Coal moisture content at coal mill inlet = coal feed amount × moisture content; The heat of coal powder at the coal mill outlet = the heat of other coal components at the coal mill outlet + the heat of water in the coal at the coal mill outlet.

[0044] To sum up, when the coal feed rate is the same, the higher the moisture content of the coal, the greater the required primary air volume; therefore, the coal types can be divided according to the moisture content of the coal; in addition, based on the above-mentioned enthalpy change process, the coal feed rate and coal feed type at the coal mill inlet will affect the primary air volume at the coal mill inlet, therefore, the second primary wind speed instruction can be determined according to the coal feed rate and coal feed type at the coal mill inlet.

[0045] Figure 3 FIG. 1 is a flow chart showing a method for controlling the primary air volume of a coal mill according to an exemplary embodiment. Figure 3 As shown, after step S102, the method further includes the following steps: In step S105, the wind speed correction instruction manually input into the coal mill is obtained.

[0046] In step S106, the second primary wind speed instruction is corrected according to the wind speed correction instruction.

[0047] Exemplarily, while determining the second primary wind speed instruction of the coal mill according to the coal feeding instruction of the coal feeder, the coal mill operator can correct the second primary wind speed instruction according to the actual situation. Therefore, when the manually input wind speed correction instruction is obtained, the second primary wind speed instruction can be corrected according to the wind speed correction instruction. For example, the wind speed correction instruction and the second primary wind speed instruction can be sent to the adder together, and the corrected instruction can be obtained after calculation as the second primary wind speed instruction.

[0048] Figure 4 FIG. 1 is a flow chart showing a method for controlling the primary air volume of a coal mill according to an exemplary embodiment. Figure 4 As shown, step S103 includes the following steps: In step S1031, a deviation value between the first wind speed instruction and the second wind speed instruction is determined.

[0049] In step S1032, the primary air control instruction is determined according to the coal feeding instruction and the deviation value.

[0050] Exemplarily, the coal feeding instruction may change as the amount of coal inside the coal mill changes; therefore, the coal feeding instruction may be used as a feedforward signal, and the primary wind control instruction may be determined based on the first primary wind speed instruction and the second primary wind speed instruction; for example, the deviation value between the first primary wind speed instruction and the second primary wind speed instruction is determined, and then the primary wind control instruction is determined based on the coal feeding instruction and the deviation value.

[0051] Figure 5 FIG. 1 is a flow chart showing a method for controlling the primary air volume of a coal mill according to an exemplary embodiment. Figure 5 As shown, the method further comprises the following steps: In step S107, when the primary wind speed at the first outlet of the coal mill is less than the wind speed threshold, the primary wind control instruction is corrected according to the primary wind speed; the first outlet is any outlet among the multiple outlets of the coal mill.

[0052] Exemplarily, during the coal grinding process, the coal mill needs to use primary air to ensure the fineness of the ground coal, ensure the drying, transportation and combustion of the coal; when the primary air volume and / or primary air speed of the coal mill are too small, the following problems may occur: the coal powder is deposited inside the coal mill or in the transportation pipeline, causing coal blockage, the wind speed of the coal mill wind ring is reduced, the fineness of the ground coal powder is insufficient, the coal powder is not fully burned, the coal powder cannot be completely dried, etc.; therefore, a wind speed threshold can be set, and when the primary wind speed at the first outlet of the coal mill is less than the wind speed threshold, the primary air control instruction is corrected according to the primary wind speed of the first outlet; for example, the wind speed threshold is 18m / s, and when the primary wind speed at the first outlet is less than 18m / s, the primary wind speed in the primary wind control instruction is controlled to increase at a specified rate until the primary wind speed at the first outlet is greater than or equal to 18m / s, wherein the specified rate can be determined according to the size of the primary wind speed at the first outlet, that is, when the primary wind speed at the first outlet is in different ranges, different specified rates correspond. In addition, in order to avoid the primary wind speed of the first outlet from continuously decreasing, the method can also set an alarm threshold, which is greater than the wind speed threshold. When the primary wind speed of the first outlet is equal to the alarm threshold, the lock is executed (the primary wind speed in the primary wind control instruction is controlled to no longer decrease), and a low wind speed alarm is issued. The first outlet is any outlet of the multiple outlets of the coal mill.

[0053] In another possible embodiment, the method further includes: When an average value of primary wind speeds at multiple outlets of the coal mill is less than the wind speed threshold, the primary wind control instruction is corrected according to the average value of the primary wind speeds.

[0054] Figure 6 FIG. 1 is a flow chart showing a method for controlling the primary air volume of a coal mill according to an exemplary embodiment. Figure 6 As shown, the method further comprises the following steps: In step S108, it is determined whether the coal mill meets the conditions for correcting the primary air control instruction according to the cold air damping valve.

[0055] In step S109, when the condition is met, the primary air control instruction is corrected according to the cold air damping valve of the coal mill.

[0056] For example, during the operation of the coal mill, the cold air damper of the coal mill is used to control the outlet temperature of the coal mill. When the cold air damper is opened widely, it means that the drying output is too large. Under the premise of ensuring the ventilation output, the primary wind speed at the inlet of the coal mill can be appropriately reduced, so that the cold air damper can be automatically closed to achieve the purpose of reducing the exhaust gas temperature. Therefore, when the working condition of the coal mill meets the conditions for modifying the primary air control instruction according to the cold air damper, the primary air control instruction can be modified according to the cold air damper.

[0057] Optionally, the condition for correcting the primary air control instruction according to the cold air damper includes: The cold air damper and hot air damper of the coal mill are in automatic control mode; The cold air damper correction function of the coal mill is in operation mode; The cold air adjustment valve instruction value of the cold air adjustment valve is greater than the cold air adjustment valve correction value; The average value of primary wind speeds at multiple outlets of the coal mill is greater than or equal to a first wind speed threshold; The primary wind speed at any outlet of the coal mill is greater than the second wind speed threshold.

[0058] Among them, the cold air damper and the hot air damper of the coal mill both include automatic control mode and manual control mode. When they are both in automatic control mode, the primary air control instruction can be corrected according to the cold air damper; the coal mill includes a function of correcting the primary air control instruction with the cold air damper. When the function is in operation mode, the primary air control instruction can be corrected according to the cold air damper; the cold air damper correction value is the manually set minimum cold air value. Only when the cold air damper instruction value generated in the automatic control mode is greater than the cold air damper correction value, the primary air control instruction needs to be corrected according to the cold air damper; before correcting the primary air control instruction according to the cold air damper, the primary wind speed of the multiple outlets of the coal mill needs to be considered. Therefore, in the present disclosure, on the basis of satisfying the above conditions, the following conditions need to be satisfied: the average value of the primary wind speed of the multiple outlets of the coal mill is greater than or equal to the first wind speed threshold, and the primary wind speed of any outlet of the multiple outlets of the coal mill is greater than the second wind speed threshold. Among them, the present disclosure does not limit the size of the first wind speed threshold and the second wind speed threshold.

[0059] Optionally, when any one of the following conditions is met, the correction of the primary air control instruction according to the cold air damper is stopped: The cold air regulating valve and hot air regulating valve of the coal mill are in manual control mode; The cold air valve correction function of the coal mill is in the exit mode; The cold air adjustment valve instruction value of the cold air adjustment valve is less than or equal to the cold air adjustment valve correction value; The average value of the primary wind speeds at the multiple outlets of the coal mill is less than the first wind speed threshold; The primary wind speed of any outlet of the coal mill is less than or equal to the second wind speed threshold; The change in the average value of the primary wind speeds at multiple outlets of the coal mill is greater than or equal to the third wind speed threshold.

[0060] Exemplarily, when any one of the above conditions is met, the correction of the primary air control instruction according to the cold air damper can be stopped, wherein the change in the average value of the primary air speeds at multiple outlets of the coal mill refers to the difference between the average value of the primary air speeds at multiple outlets at the current moment and the average value of the primary air speeds at multiple outlets at the previous moment.

[0061] Figure 7 FIG. 1 is a flow chart showing a method for controlling the primary air volume of a coal mill according to an exemplary embodiment. Figure 7 As shown, step S109 includes the following steps: In step S1091, the deviation value between the cold air damping command value and the cold air damping correction value of the coal mill is determined.

[0062] In step S1092, the primary air control instruction is corrected according to the deviation value.

[0063] Exemplarily, when correcting the primary air control instruction according to the cold air damper of the coal mill, the primary air control instruction can be corrected according to the deviation between the cold air damper instruction value and the cold air damper correction value of the cold air damper of the coal mill. For example, the cold air damper instruction value is sent to the regulator at the same time as the cold air damper correction value after second-order filtering (120 seconds) to calculate the deviation between the two. When the deviation is greater than 0, the deviation can be used as a signal to correct the primary air control instruction to reduce the opening of the hot air damper of the coal mill and reduce the primary air speed at the coal mill outlet.

[0064] In addition, when any condition for stopping the correction of the primary air control instruction according to the cold air damping valve is met, the process of correcting the primary air control instruction according to the cold air damping valve of the coal mill will be automatically terminated, and after a specified time, it will be re-evaluated whether the coal mill meets the conditions for correcting the primary air control instruction according to the cold air damping valve, and the process will be repeated in sequence.

[0065] The method may also include: when the cold air damper of the coal mill is in a closed state for a long time, that is, the time when the cold air damper opening is 0% is greater than the specified time threshold, and the average value of the primary wind speeds at multiple outlets of the coal mill is less than the first wind speed threshold, the primary air control instruction can be corrected to increase the primary wind speed at the coal mill inlet; when the cold air damper opening is greater than or equal to the set opening threshold, the logic instruction can be controlled to stop.

[0066] Through the above technical scheme, the first primary wind speed instruction of the coal mill is determined according to the primary wind speed of each of the multiple outlets of the coal mill; the second primary wind speed instruction of the coal mill is determined according to the coal feeding instruction of the coal feeder; the primary wind control instruction of the coal mill is determined according to the first primary wind speed instruction and / or the second primary wind speed instruction; the hot air damper opening of the coal mill is adjusted according to the primary wind control instruction to control the primary air volume at the inlet of the coal mill. By adjusting the primary air volume at the inlet of the coal mill through the primary wind speed at the outlet of the coal mill, the synchronization between the primary air volume of the coal mill and the load of the coal mill can be better maintained, thereby reducing the possibility of failure during the operation of the coal mill.

[0067] Figure 8 FIG. 8 is a schematic diagram of a coal mill primary air volume control device 800 according to an exemplary embodiment. Figure 8 As shown, the device 800 includes: a first determination module 810, a second determination module 820, a third determination module 830 and a control module 840; wherein: The first determination module 810 is used to determine a first primary wind speed instruction of the coal mill according to the primary wind speed of each outlet of the coal mill; The second determining module 820 is used to determine the second primary wind speed instruction of the coal mill according to the coal feeding instruction of the coal feeder; The third determination module 830 is used to determine the primary air control instruction of the coal mill according to the first primary air speed instruction and / or the second primary air speed instruction; The control module 840 is used to adjust the hot air damper opening of the coal mill according to the primary air control instruction to control the primary air volume at the inlet of the coal mill.

[0068] Optionally, the second determination module 820 is used to determine the second primary wind speed instruction according to the coal feeding type and coal feeding amount of the coal mill; the coal feeding instruction includes the coal feeding type and coal feeding amount.

[0069] Optionally, the second determining module 820 is further configured to: Obtaining a manually input wind speed correction instruction in the coal mill; The first wind speed second instruction is corrected according to the wind speed correction instruction.

[0070] Optionally, the third determination module 830 includes: a calculation submodule and a determination submodule; The calculation submodule is used to determine a deviation value between the first wind speed instruction and the second wind speed instruction; The determination submodule is used to determine the primary air control instruction according to the coal feeding instruction and the deviation value.

[0071] Optionally, the device further comprises an instruction correction module; The instruction correction module is used to correct the primary air control instruction according to the primary wind speed when the primary wind speed at the first outlet of the coal mill is less than the wind speed threshold; the first outlet is any outlet among the multiple outlets of the coal mill.

[0072] Optionally, the instruction correction module includes: a judgment submodule and an instruction correction submodule; The judging submodule is used to judge whether the coal mill meets the condition of correcting the primary air control instruction according to the cold air regulating valve; The instruction correction submodule is used to correct the primary air control instruction according to the cold air damper of the coal mill when the condition is met.

[0073] Optionally, the condition for correcting the primary air control instruction according to the cold air damper includes: The cold air damper and hot air damper of the coal mill are in automatic control mode; The cold air damper correction function of the coal mill is in operation mode; The cold air adjustment valve instruction value of the cold air adjustment valve is greater than the cold air adjustment valve correction value; The average value of primary wind speeds at multiple outlets of the coal mill is greater than or equal to a first wind speed threshold; The primary wind speed at any outlet of the coal mill is greater than the second wind speed threshold.

[0074] Optionally, the instruction modifies the submodule and is also used to: Determine the deviation between the cold air regulating valve instruction value and the cold air regulating valve correction value of the cold air regulating valve of the coal mill; The primary air control instruction is corrected according to the deviation value.

[0075] Optionally, when any one of the following conditions is met, the correction of the primary air control instruction according to the cold air damper is stopped: The cold air regulating valve and hot air regulating valve of the coal mill are in manual control mode; The cold air valve correction function of the coal mill is in the exit mode; The cold air adjustment valve instruction value of the cold air adjustment valve is less than or equal to the cold air adjustment valve correction value; The average value of the primary wind speeds at the multiple outlets of the coal mill is less than the first wind speed threshold; The primary wind speed of any outlet of the coal mill is less than or equal to the second wind speed threshold; The change in the average value of the primary wind speeds at multiple outlets of the coal mill is greater than or equal to the third wind speed threshold.

[0076] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0077] Through the above technical scheme, the first primary wind speed instruction of the coal mill is determined according to the primary wind speed of each of the multiple outlets of the coal mill; the second primary wind speed instruction of the coal mill is determined according to the coal feeding instruction of the coal feeder; the primary wind control instruction of the coal mill is determined according to the first primary wind speed instruction and / or the second primary wind speed instruction; the hot air damper opening of the coal mill is adjusted according to the primary wind control instruction to control the primary air volume at the inlet of the coal mill. By adjusting the primary air volume at the inlet of the coal mill through the primary wind speed at the outlet of the coal mill, the synchronization between the primary air volume of the coal mill and the load of the coal mill can be better maintained, thereby reducing the possibility of failure during the operation of the coal mill.

[0078] Fig. 9 FIG. 1 is a schematic diagram of an electronic device 900 according to an exemplary embodiment. Fig. 9 As shown, the electronic device 900 may include: a processor 901 , a memory 902 . The electronic device 900 may also include one or more of a multimedia component 903 , an input / output (I / O) interface 904 , and a communication component 905 .

[0079] The processor 901 is used to control the overall operation of the electronic device 900 to complete all or part of the steps in the above-mentioned coal mill primary air volume control method. The memory 902 is used to store various types of data to support the operation of the electronic device 900, and these data may include, for example, instructions for any application or method used to operate on the electronic device 900, and application-related data, such as contact data, sent and received messages, pictures, audio, video, etc. The memory 902 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (Static Random Access Memory, referred to as SRAM), electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, referred to as EEPROM), erasable programmable read-only memory (Erasable Programmable Read-Only Memory, referred to as EPROM), programmable read-only memory (Programmable Read-Only Memory, referred to as PROM), read-only memory (Read-Only Memory, referred to as ROM), magnetic memory, flash memory, disk or optical disk. The multimedia component 903 may include a screen and an audio component. The screen may be, for example, a touch screen, and the audio component is used to output and / or input audio signals. For example, the audio component may include a microphone, which is used to receive external audio signals. The received audio signal may be further stored in the memory 902 or sent through the communication component 905. The audio component also includes at least one speaker for outputting audio signals. The I / O interface 904 provides an interface between the processor 901 and other interface modules, and the other interface modules may be keyboards, mice, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 905 is used for wired or wireless communication between the electronic device 900 and other devices. Wireless communication, such as Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, etc., or a combination of one or more of them, is not limited here. Therefore, the corresponding communication component 905 may include: Wi-Fi module, Bluetooth module, NFC module, etc.

[0080] In an exemplary embodiment, the electronic device 900 can be implemented by one or more application specific integrated circuits (ASIC), digital signal processors (DSP), digital signal processing devices (DSPD), programmable logic devices (PLD), field programmable gate arrays (FPGA), controllers, microcontrollers, microprocessors or other electronic components to execute the above-mentioned coal mill primary air volume control method.

[0081] In another exemplary embodiment, a computer-readable storage medium including program instructions is also provided, and when the program instructions are executed by a processor, the steps of the above-mentioned coal mill primary air volume control method are implemented. For example, the computer-readable storage medium can be the above-mentioned memory 902 including program instructions, and the above-mentioned program instructions can be executed by the processor 901 of the electronic device 900 to complete the above-mentioned coal mill primary air volume control method.

[0082] In another exemplary embodiment, a computer program product is also provided. The computer program product includes a computer program that can be executed by a programmable device, and the computer program has a code portion for executing the above-mentioned coal mill primary air volume control method when executed by the programmable device.

[0083] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0084] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0085] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A method for controlling the primary air volume of a coal mill. It is characterized in that include: Determining a first primary wind speed instruction of the coal mill according to the primary wind speed of each outlet of the plurality of outlets of the coal mill; Determining a second primary wind speed instruction of the coal mill according to a coal feeding instruction of the coal feeder; Determining a primary air control instruction of the coal mill according to the first primary air speed instruction and / or the second primary air speed instruction; The hot air damper opening of the coal mill is adjusted according to the primary air control instruction to control the primary air volume at the inlet of the coal mill.

2. The method according to claim 1, It is characterized in that The method of determining the second primary wind speed instruction of the coal mill according to the coal feeding instruction of the coal feeder comprises: The second primary wind speed instruction is determined according to the coal feeding type and coal feeding amount of the coal mill; the coal feeding instruction includes the coal feeding type and coal feeding amount.

3. The method according to claim 1, It is characterized in that After determining the second primary wind speed instruction of the coal mill according to the coal feeding instruction of the coal feeder, the method further includes: Obtaining a manually input wind speed correction instruction in the coal mill; The first wind speed second instruction is corrected according to the wind speed correction instruction.

4. The method according to claim 1, It is characterized in that The determining of the primary air control instruction of the coal mill according to the first primary air speed instruction and / or the second primary air speed instruction comprises: Determining a deviation value between the primary wind speed first instruction and the primary wind speed second instruction; The primary air control instruction is determined according to the coal feeding instruction and the deviation value.

5. The method according to claim 1, It is characterized in that The method further comprises: When the primary wind speed at the first outlet of the coal mill is less than a wind speed threshold, the primary wind control instruction is corrected according to the primary wind speed; the first outlet is any one of the multiple outlets of the coal mill.

6. The method according to claim 1, It is characterized in that The method further comprises: Determining whether the coal mill meets the condition of correcting the primary air control instruction according to the cold air damper; When the conditions are met, the primary air control instruction is corrected according to the cold air damper of the coal mill.

7. The method according to claim 6, It is characterized in that The conditions for correcting the primary air control instruction according to the cold air damper include: The cold air regulating valve and the hot air regulating valve of the coal mill are in automatic control mode; The cold air valve correction function of the coal mill is in operation mode; The cold air adjustment valve instruction value of the cold air adjustment valve is greater than the cold air adjustment valve correction value; The average value of the primary wind speeds at the multiple outlets of the coal mill is greater than or equal to the first wind speed threshold; The primary wind speed at any one of the multiple outlets of the coal mill is greater than the second wind speed threshold.

8. The method according to claim 6, It is characterized in that When the condition is met, the primary air control instruction is corrected according to the cold air damper of the coal mill, including: Determine a deviation value between a cold air valve command value and a cold air valve correction value of the coal mill cold air valve; The primary wind control instruction is corrected according to the deviation value.

9. The method according to claim 7, It is characterized in that The method further comprises: When any one of the following conditions is met, the correction of the primary air control instruction according to the cold air damper is stopped: The cold air regulating valve and hot air regulating valve of the coal mill are in manual control mode; The cold air valve adjustment correction function of the coal mill is in the exit mode; The cold air damping valve instruction value of the cold air damping valve is less than or equal to the cold air damping valve correction value; The average value of the primary wind speeds at the multiple outlets of the coal mill is less than the first wind speed threshold; The primary wind speed of any outlet of the coal mill is less than or equal to the second wind speed threshold; The change in the average value of the primary wind speeds at the multiple outlets of the coal mill is greater than or equal to the third wind speed threshold.

10. A primary air volume control device for a coal mill, It is characterized in that include: A first determination module, configured to determine a first primary wind speed instruction of the coal mill according to a primary wind speed of each outlet of a plurality of outlets of the coal mill; A second determination module, configured to determine a second primary wind speed instruction of the coal mill according to a coal feeding instruction of the coal feeder; A third determination module, configured to determine a primary air control instruction of the coal mill according to the first primary air speed instruction and / or the second primary air speed instruction; A control module is used to adjust the hot air damper opening of the coal mill according to the primary air control instruction to control the primary air volume at the inlet of the coal mill.

11. A non-transitory computer-readable storage medium having computer program instructions stored thereon, It is characterized in that When the computer program instructions are executed by a processor, the steps of the method according to any one of claims 1 to 9 are implemented.

12. An electronic device, It is characterized in that include: a memory having a computer program stored thereon; A processor, configured to execute the computer program in the memory to implement the steps of the method according to any one of claims 1 to 9.

13. A computer program product comprising a computer program, It is characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 9 are implemented.

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