A method and apparatus for controlling coal feeding during the sequential start-up process of a pulverizing system.

Abstract

This application relates to a method and apparatus for controlling coal feeding during the sequential start-up process of a pulverizing system. The specific scheme involves: acquiring the maximum output value of the target mill to be started, the number of currently operating mills, and the current coal feed rate of each currently operating mill; acquiring the preset coal feeding rate of the target mill; acquiring the current coal feed rate of the mill and the current wall temperature of the generator set's high-temperature superheater in real time; determining the target coal feeding rate of the target mill based on the current wall temperature of the high-temperature superheater, the current coal feed rate, and the preset coal feeding rate; controlling the coal feeder of the target mill to feed coal to the target mill based on the corrected target coal feeding rate; and controlling the coal feeder to stop feeding coal to the target mill in response to the current coal feed rate meeting the preset requirements. This application achieves automatic start-up of the mill.

Description

Technical Field

[0001] This application relates to the field of control technology for pulverizing systems of thermal power units, and in particular to a method and device for controlling coal feeding during the sequential start-up process of a pulverizing system. Background Technology

[0002] In related technologies, most sequential start-up systems only start the mill to a basic coal quantity, and then the operators gradually control the addition of coal and air to achieve parallel milling. The operation process is complicated and wastes manpower and time costs. Therefore, it is necessary to propose a method for controlling the coal feeding rate during the sequential one-button start-up of the pulverizing system to achieve unmanned intervention in the entire start-up process. Summary of the Invention

[0003] Therefore, this application provides a method and apparatus for controlling coal feeding during the sequential start-up process of a pulverizing system. The technical solution of this application is as follows:

[0004] According to a first aspect of the embodiments of this application, a method for controlling coal feeding during the sequential start-up process of a pulverizing system is provided, the method comprising:

[0005] The maximum output value of the target mill group to be started, the number of mill groups currently in operation, and the current coal feed rate of each of the currently operating mill groups are obtained respectively.

[0006] Based on the maximum output value and the number of currently operating mill groups, the preset coal feeding rate of the target mill group is obtained; wherein, the preset coal feeding rate includes a first coal feeding rate, a second coal feeding rate, and a third coal feeding rate; wherein, the first coal feeding rate is less than the second coal feeding rate, and the second coal feeding rate is less than the third coal feeding rate;

[0007] Control the target grinding unit to start, and obtain the current coal feed rate of the grinding unit and the current wall temperature of the high-temperature superheater of the generator unit in real time;

[0008] The target coal feeding rate of the target mill group is determined based on the current wall temperature of the high-temperature superheater, the current coal feed rate, and the preset coal feeding rate.

[0009] The target coal feeding rate is corrected based on the current coal feed rate of each of the currently operating mills.

[0010] The coal feeder of the target mill is controlled to feed coal to the target mill based on the target coal feeding rate after correction processing;

[0011] In response to the current coal feed rate meeting the preset requirements, the coal feeder is controlled to stop feeding coal to the target mill.

[0012] According to one embodiment of this application, determining the target coal feeding rate of the target mill based on the current wall temperature of the high-temperature superheater, the current coal feed rate, and the preset coal feeding rate includes:

[0013] Based on the current wall temperature of the high-temperature superheater, determine the rate of change of the current wall temperature of the high-temperature superheater;

[0014] In response to the current wall temperature of the high-temperature superheater being greater than or equal to a first preset threshold, and / or in response to the current wall temperature change rate of the high-temperature superheater being greater than or equal to a second preset threshold, the target coal feeding rate of the target mill group is determined to be the first coal feeding rate.

[0015] In response to the current coal feed rate being less than a third preset threshold, the target coal feeding rate of the target mill is determined to be the third coal feeding rate.

[0016] In response to the current wall temperature of the high-temperature superheater being less than the first preset threshold, the current wall temperature change rate of the high-temperature superheater being less than the second preset threshold, and the current coal feed rate being greater than or equal to the third preset threshold, the target coal feeding rate of the target mill is determined to be the second coal feeding rate.

[0017] According to one embodiment of this application, determining the target coal feeding rate of the target mill based on the current wall temperature of the high-temperature superheater, the current coal feed rate, and the preset coal feeding rate further includes:

[0018] In response to the current wall temperature of the high-temperature superheater being greater than or equal to a first preset threshold, and / or in response to the current wall temperature change rate of the high-temperature superheater being greater than or equal to a second preset threshold, and the current coal feed rate being less than a third preset threshold, the target coal feeding rate of the target mill is determined to be the third coal feeding rate.

[0019] According to one embodiment of this application, the step of correcting the target coal feeding rate based on the current coal feed rate of each of the currently operating mills includes:

[0020] Based on the current coal feed rate of each of the currently operating mill groups, determine the average coal feed rate of the currently operating mill groups;

[0021] The correction coefficient is determined based on the average coal feed rate.

[0022] Multiply the correction coefficient by the target coal feeding rate to obtain the corrected target coal feeding rate.

[0023] According to one embodiment of this application, determining the correction coefficient based on the average coal feed rate includes:

[0024] In response to the average coal feed rate being less than or equal to the first preset coal feed rate, the correction coefficient is determined to be 0;

[0025] In response to the average coal feed rate being greater than the first preset coal feed rate and less than the second preset coal feed rate, the correction coefficient is determined based on the first preset correction coefficient, the first preset threshold, and the second preset threshold; wherein the first preset coal feed rate is less than the second preset coal feed rate;

[0026] In response to the average coal feed rate being greater than the second preset coal feed rate, the determined correction coefficient is determined to be the first preset correction coefficient.

[0027] According to one embodiment of this application, determining the correction coefficient based on the first preset correction coefficient, the first preset threshold, and the second preset threshold includes:

[0028] The first preset threshold is determined as the first horizontal coordinate, and 0 is determined as the first vertical coordinate to obtain the coordinates of the first target point.

[0029] The second preset threshold is determined as the second horizontal coordinate, and the first preset correction coefficient is determined as the second vertical coordinate to obtain the coordinates of the second target point;

[0030] Based on the coordinates of the first target point and the coordinates of the second target point, determine a linear function that passes through the coordinates of the first target point and the coordinates of the second target point;

[0031] The correction coefficient is determined based on the linear function and the average coal feed rate.

[0032] According to one embodiment of this application, the step of controlling the coal feeder to stop feeding coal to the target mill in response to the current coal feed rate meeting a preset requirement includes:

[0033] Based on the current coal feed rate of each of the currently operating mill units, determine the minimum coal carrying capacity;

[0034] In response to the maximum output value of the target mill being greater than or equal to the minimum coal carrying capacity, the coal feeder is controlled to stop feeding coal to the target mill.

[0035] According to a second aspect of the embodiments of this application, a coal feeding control device for the sequential start-up process of a pulverizing system is provided, the device comprising:

[0036] The first acquisition module is used to acquire the maximum output value of the target mill group to be started, the number of mill groups currently running, and the current coal feed rate of each of the currently running mill groups.

[0037] The second acquisition module is used to acquire the preset coal feeding rate of the target mill based on the maximum output value and the number of mills currently in operation; wherein the preset coal feeding rate includes a first coal feeding rate, a second coal feeding rate and a third coal feeding rate; wherein the first coal feeding rate is less than the second coal feeding rate, and the second coal feeding rate is less than the third coal feeding rate;

[0038] The third acquisition module is used to control the start-up of the target grinding group and acquire the current coal feed rate of the grinding group and the current wall temperature of the high-temperature superheater of the generator set in real time.

[0039] The determination module is used to determine the target coal feeding rate of the target mill based on the current wall temperature of the high-temperature superheater, the current coal feed rate, and the preset coal feeding rate.

[0040] The correction module is used to correct the target coal feeding rate based on the current coal feed rate of each of the currently operating mills.

[0041] The first control module is used to control the coal feeder of the target mill to feed coal to the target mill based on the target coal feeding rate after correction processing;

[0042] The second control module is used to control the coal feeder to stop feeding coal to the target mill in response to the current coal feed rate meeting the preset requirements.

[0043] According to a third aspect of the embodiments of this application, an electronic device is provided, including: a processor, and a memory communicatively connected to the processor;

[0044] The memory stores computer-executed instructions;

[0045] The processor executes computer execution instructions stored in the memory to implement the method as described in any one of the first aspects.

[0046] According to a fourth aspect of the embodiments of this application, a computer-readable storage medium is provided, wherein computer-executable instructions are stored therein, which, when executed by a processor, are used to implement the method as described in any one of the first aspects.

[0047] The technical solutions provided by the embodiments of this application bring at least the following beneficial effects:

[0048] By acquiring the maximum output value of the target mill to be started, the number of currently operating mills, and the current coal feed rate of each currently operating mill; based on the maximum output value and the number of currently operating mills, the preset coal feeding rate of the target mill is obtained; the target mill is started by controlling its startup, and the current coal feed rate of the mill and the current wall temperature of the generator's high-temperature superheater are acquired in real time; based on the current wall temperature of the high-temperature superheater, the current coal feed rate, and the preset coal feeding rate, the target coal feeding rate of the target mill is determined; based on the current coal feed rate of each currently operating mill, the target coal feeding rate is corrected; based on the corrected target coal feeding rate, the coal feeder of the target mill is controlled to feed coal to the target mill; in response to the current coal feed rate meeting the preset requirements, the coal feeder is controlled to stop feeding coal to the target mill. This achieves automatic mill startup, improves the accuracy of coal feeding rate control during mill startup, and increases the efficiency of mill startup.

[0049] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0050] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application, and do not constitute an undue limitation of this application.

[0051] Figure 1 This is a flowchart illustrating a coal feeding control method for a sequential start-up process in a pulverizing system, as described in this application embodiment.

[0052] Figure 2 This is a structural block diagram of a coal feeding control device for a sequential start-up process of a pulverizing system, as described in an embodiment of this application.

[0053] Figure 3 This is a block diagram of an electronic device according to an embodiment of this application. Detailed Implementation

[0054] To enable those skilled in the art to better understand the technical solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0055] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0056] It should be noted that in most related technologies, sequential start-up systems only start the mill to a basic coal quantity, and then the operators gradually control the addition of coal and air to achieve simultaneous grinding. The operation process is complicated and wastes manpower and time costs. Therefore, it is necessary to propose a method for controlling the coal feeding rate during the sequential one-button start-up of the pulverizing system to achieve unmanned intervention in the entire start-up process.

[0057] To address the aforementioned issues, this application proposes a method and apparatus for controlling coal feeding during the sequential start-up process of a pulverizing system. This involves acquiring the maximum output value of the target mill to be started, the number of currently operating mills, and the current coal feed rate for each currently operating mill. Based on the maximum output value and the number of currently operating mills, a preset coal feeding rate for the target mill is obtained. The target mill is then started, and the current coal feed rate of the mill and the current wall temperature of the generator set's high-temperature superheater are acquired in real time. Based on the current wall temperature of the high-temperature superheater, the current coal feed rate, and the preset coal feeding rate, a target coal feeding rate for the target mill is determined. The target coal feeding rate is then corrected based on the current coal feed rate of each currently operating mill. The coal feeder of the target mill is controlled to feed coal to the target mill based on the corrected target coal feeding rate. Finally, in response to the current coal feed rate meeting the preset requirements, the coal feeder is controlled to stop feeding coal to the target mill. This achieves automatic start-up of the mill, improves the accuracy of coal feeding rate control during the start-up process, and increases the efficiency of mill start-up.

[0058] It should be noted that the grinding unit includes a coal feeder, a coal separator, a pulverized coal conveying pipeline, and a coal mill. Each grinding unit has a corresponding high-temperature superheater.

[0059] Figure 1 This is a flowchart of a coal feeding control method for a sequential start-up process of a pulverizing system, as described in an embodiment of this application.

[0060] like Figure 1 As shown, the coal feeding control method for the sequential start-up process of this pulverizing system includes:

[0061] Step 101: Obtain the maximum output value of the target mill group to be started, the number of mill groups currently in operation, and the current coal feed rate of each mill group currently in operation.

[0062] It should be noted that the maximum output value of the target grinding unit can be the nameplate output value of the target grinding unit, that is, the maximum output value under the condition of ensuring stable operation of the target grinding unit.

[0063] Understandably, multiple mills may be operating simultaneously. When it is necessary to start another mill, it is necessary to determine the number of mills currently in operation and the current coal feed rate of each mill currently in operation.

[0064] Step 102: Based on the maximum output value and the number of mills currently in operation, obtain the preset coal feeding rate of the target mill.

[0065] In this embodiment of the application, the preset coal feeding rate includes a first coal feeding rate, a second coal feeding rate, and a third coal feeding rate.

[0066] In this embodiment of the application, the first coal feeding rate is less than the second coal feeding rate, and the second coal feeding rate is less than the third coal feeding rate.

[0067] As an example of a possible implementation, the first coal feeding rate, the second coal feeding rate, and the third coal feeding rate can be preset by the following method:

[0068] The first coal feeding rate can be determined based on the target mill's installed capacity and the mill's load change rate setting. For example, for a mill with an installed capacity of 1000MW, the load change rate setting is 10-20MW / min, which translates to a coal feeding rate of 5t / h / min, i.e., the installed capacity divided by the load change rate setting.

[0069] For the second coal feeding rate, if at least one of the currently operating mills is at risk of clogging due to an excessively high coal feeding rate, then the second coal feeding rate is set for different numbers of mills based on the number of currently operating mills and the actual demand for load increase rate.

[0070] For the third coal feeding rate, in order to quickly reach the target load value at the initial stage of the target mill group startup, the third coal feeding rate is set according to the number of mill groups currently in operation.

[0071] It is understandable that different maximum output values ​​and different numbers of currently operating mill units correspond to a specific coal feeding rate. As a possible implementation example, the preset coal feeding rate of the target mill unit is obtained based on the maximum output value and the number of currently operating mill units.

[0072] Step 103: Control the target grinding group to start, and obtain the current coal feed rate of the grinding group and the current wall temperature of the high-temperature superheater of the generator set in real time.

[0073] Step 104: Determine the target coal feeding rate of the target mill based on the current wall temperature of the high-temperature superheater, the current coal feed rate, and the preset coal feeding rate.

[0074] In some embodiments of this application, step 104 includes:

[0075] Step a1: Determine the rate of change of the current wall temperature of the high-temperature superheater based on the current wall temperature of the high-temperature superheater.

[0076] Understandably, based on the current wall temperature of the high-temperature superheater obtained at each moment, the rate of change of the current wall temperature of the high-temperature superheater can be calculated.

[0077] Step a2: In response to the current wall temperature of the high-temperature superheater being greater than or equal to a first preset threshold, and / or in response to the current wall temperature change rate of the high-temperature superheater being greater than or equal to a second preset threshold, the target coal feeding rate of the target mill group is determined to be the first coal feeding rate.

[0078] Understandably, when the high-temperature superheater wall temperature of the target mill is overheating or rising rapidly, a lower coal feeding rate should be selected. Too fast a coal feeding rate will aggravate combustion disturbance in the furnace, leading to further exacerbation of the overheating situation.

[0079] It should be noted that both the first preset threshold and the second preset threshold are thresholds that are preset according to actual needs.

[0080] As an example of a possible implementation, in response to the current wall temperature of the high-temperature superheater being greater than or equal to a first preset threshold, and / or in response to the current wall temperature change rate of the high-temperature superheater being greater than or equal to a second preset threshold, the target coal feeding rate of the target mill is determined to be the first coal feeding rate.

[0081] Step a3: In response to the current coal feed rate being less than the third preset threshold, the target coal feeding rate of the target mill group is determined to be the third coal feeding rate.

[0082] For example, when the coal feed rate of the target mill is in the range of 15t / h to 30t / h, that is, in the initial stage of starting the mill and feeding the coal drop roller, a high coal feeding rate should be selected. At this time, the coal feed rate of the mill is low, and in addition, coal powder accumulates in the mill in the initial stage of starting the mill. If the coal feeding rate is too slow, it will cause the flame detector at the outlet of the mill tube to be unstable or disappear, triggering the mill to jump. Therefore, it is necessary to quickly increase the coal feed rate by using a higher coal feeding rate.

[0083] Step a4: In response to the current wall temperature of the high-temperature superheater being less than the first preset threshold, the current wall temperature change rate of the high-temperature superheater being less than the second preset threshold, and the current coal feed rate being greater than or equal to the third preset threshold, the target coal feeding rate of the target mill group is determined to be the second coal feeding rate.

[0084] As an example of a possible implementation, in response to the current wall temperature of the high-temperature superheater being less than a first preset threshold, the current wall temperature change rate of the high-temperature superheater being less than a second preset threshold, and the current coal feed rate being greater than or equal to a third preset threshold, i.e., neither the triggering condition of the first coal feed rate nor the triggering condition of the third coal feed rate is met, the target coal feed rate of the target mill is determined to be the second coal feed rate.

[0085] In some embodiments of this application, step 104 further includes: in response to the current wall temperature of the high-temperature superheater being greater than or equal to a first preset threshold, and / or in response to the current wall temperature change rate of the high-temperature superheater being greater than or equal to a second preset threshold, and the current coal feed rate being less than a third preset threshold, determining the target coal feeding rate of the target mill group as a third coal feeding rate.

[0086] As an example of a possible implementation, in response to the current wall temperature of the high-temperature superheater being greater than or equal to a first preset threshold, and / or in response to the current wall temperature change rate of the high-temperature superheater being greater than or equal to a second preset threshold, and when the current coal feed rate is less than a third preset threshold, i.e., when both the triggering conditions for the first coal feed rate and the triggering conditions for the third coal feed rate are met, the target coal feed rate of the target mill group is preferentially determined as the third coal feed rate, thereby increasing the coal feed rate as quickly as possible.

[0087] Step 105: Based on the current coal feed rate of each of the currently operating mill units, the target coal feeding rate is corrected.

[0088] In some embodiments of this application, step 105 includes:

[0089] Step b1: Determine the average coal feed rate of the currently operating mill based on the current coal feed rate of each of the currently operating mills.

[0090] As an example of possible implementation, the current coal feed rates of each of the currently operating mills are added together to obtain the total coal feed rate. The total coal feed rate is then divided by the number of currently operating mills to obtain the average coal feed rate of the currently operating mills.

[0091] As another possible implementation example, the average coal feed rate of the currently operating mill is calculated using the following formula:

[0092]

[0093] In the formula, x iLet y be the coal feed rate of the i-th mill unit, in t / h; i The y value represents the operating state of the i-th grinding mill unit, an integer of 0 or 1. i A value of 1 indicates that the i-th grinding unit is running, and a value of 0 indicates that the grinding unit is stopped. Grinding unit y is in the process of sequential start-up. i The value is 0; This refers to the average coal feed rate of the currently operating mill unit.

[0094] Step b2: Determine the correction coefficient based on the average coal feed rate.

[0095] In some embodiments of this application, step b2 includes:

[0096] Step b21: In response to the average coal feed rate being less than or equal to the first preset coal feed rate, the correction coefficient is determined to be 0.

[0097] Step b22: In response to the average coal feed being greater than the first preset coal feed and less than the second preset coal feed, a correction coefficient is determined based on the first preset correction coefficient, the first preset threshold, and the second preset threshold.

[0098] In this embodiment of the application, the first preset coal quantity is less than the second preset coal quantity.

[0099] In some embodiments of this application, step b22 specifically includes:

[0100] Step c1: Determine the first preset threshold as the first horizontal coordinate and 0 as the first vertical coordinate to obtain the coordinates of the first target point.

[0101] Step c2: Determine the second preset threshold as the second horizontal coordinate and the first preset correction coefficient as the second vertical coordinate to obtain the coordinates of the second target point.

[0102] Step c3: Based on the coordinates of the first target point and the second target point, determine a linear function that passes through the coordinates of the first target point and the second target point.

[0103] Step c4: Determine the correction coefficient based on the linear function and the average coal feed rate.

[0104] As a possible implementation example, the average coal feed rate is substituted into the linear function as a variable to obtain the correction coefficient.

[0105] Step b23: In response to the average coal feed rate being greater than the second preset coal feed rate, the correction coefficient is determined to be the first preset correction coefficient.

[0106] For example, the correction factor δ can be calculated using the following formula:

[0107]

[0108] The first preset coal quantity is set at 55 t / h, the second preset coal quantity is set at 75 t / h, and the first preset correction coefficient is set at 1.5. For the above linear function, Passing through the coordinates of the first target point (55, 0) and the coordinates of the second target point (75, 1.5).

[0109] It should be noted that when the average coal feed rate of other operating mill groups... When the output of the coal mill approaches 75 t / h (nameplate output), other operating mills face a higher risk of clogging. Therefore, the coefficient δ should be increased to accelerate the coal feeding rate during sequential start-up. When the average coal feed rate of other operating mills... When the coal quantity is relatively small, if the newly started mill is further increased, it will lead to... Further reduction could cause blockages in the coal feed pipes of other operating mills, leading to combustion fluctuations in the furnace and overheating of the superheater wall. Based on experience, when the average coal feed rate of the currently operating mills is approximately 55 t / h, the coal feed rate of newly started mills should be stopped, and the correction factor δ should be reduced to 0 to maintain the current coal feed rate. As the load further increases and Continue adding coal after increasing the volume.

[0110] It is understandable that the physical meaning of the first target point coordinates (55, 0) is: if the average coal feed rate of the currently operating mill is less than 55 t / h, then the coal feeding rate of the newly started target mill is 0 times the base rate, meaning that no further coal needs to be added, and coal should only be added when the average coal feed rate of the currently operating mill exceeds 55 t / h. The second target point coordinates (75, 1.5) indicate that when the average coal feed rate of the currently operating mill exceeds 75 t / h, coal should be added at a rate of 1.5 times the base rate.

[0111] Step b3: Multiply the correction coefficient by the target coal feeding rate to obtain the corrected target coal feeding rate.

[0112] As an example of possible implementation, the correction factor δ is multiplied by the target coal feeding rate to obtain the corrected target coal feeding rate.

[0113] Step 106: Based on the corrected target coal feeding rate, control the coal feeder of the target mill to feed coal to the target mill.

[0114] Step 107: In response to the current coal feed rate meeting the preset requirements, control the coal feeder to stop feeding coal to the target mill.

[0115] In some embodiments of this application, step 107 includes:

[0116] Step d1: Determine the minimum coal carrying capacity based on the current coal feed rate of each of the currently operating mill units.

[0117] As an example of possible implementation, the minimum value of the current coal feed rate for each of the currently operating mill units is determined, and this minimum value is defined as the minimum coal carrying capacity.

[0118] As another possible implementation example, the minimum coal carrying capacity can be calculated using the following formula:

[0119] x min =min[x1+75(1-y1),x2+75(1-y2),...,x n +75(1-y n )]

[0120] Where, x min This is the minimum coal carrying capacity, which is generally less than or equal to the mill's nameplate output (approximately 75 t / h); x1, x2, ..., x n The coal quantity for each mill unit; y1, y2, ..., y n This represents the operating status of each mill unit. A value of 1 indicates that it is running, and a value of 0 indicates that it is stopped or starting up.

[0121] Step d2: In response to the maximum output value of the target mill being greater than or equal to the minimum coal carrying capacity, the coal feeder is controlled to stop feeding coal to the target mill.

[0122] According to the coal feeding control method for the sequential start-up process of the pulverizing system in this application embodiment, the maximum output value of the target mill to be started, the number of currently operating mills, and the current coal feed rate of each currently operating mill are obtained respectively; based on the maximum output value and the number of currently operating mills, a preset coal feeding rate for the target mill is obtained; the target mill is started, and the current coal feed rate of the mill and the current wall temperature of the high-temperature superheater of the generator set are obtained in real time; based on the current wall temperature of the high-temperature superheater, the current coal feed rate, and the preset coal feeding rate, the target coal feeding rate of the target mill is determined; based on the current coal feed rate of each currently operating mill, the target coal feeding rate is corrected; based on the corrected target coal feeding rate, the coal feeder of the target mill is controlled to feed coal to the target mill; in response to the current coal feed rate meeting the preset requirements, the coal feeder is controlled to stop feeding coal to the target mill. This achieves automatic start-up of the mill, improves the accuracy of coal feeding rate control during the start-up process, and increases the efficiency of mill start-up.

[0123] Figure 2 This is a structural block diagram of a coal feeding control device for a sequential start-up process of a pulverizing system, as described in an embodiment of this application.

[0124] like Figure 2 As shown, the coal feeding control device for the sequential start-up process of the pulverizing system includes:

[0125] The first acquisition module 201 is used to acquire the maximum output value of the target mill group to be started, the number of mill groups currently running, and the current coal feed rate of each mill group currently running.

[0126] The second acquisition module 202 is used to acquire the preset coal feeding rate of the target mill based on the maximum output value and the number of mills currently in operation; wherein the preset coal feeding rate includes a first coal feeding rate, a second coal feeding rate and a third coal feeding rate; wherein the first coal feeding rate is less than the second coal feeding rate and the second coal feeding rate is less than the third coal feeding rate.

[0127] The third acquisition module 203 is used to control the start-up of the target grinding group and to acquire the current coal feed rate of the grinding group and the current wall temperature of the high-temperature superheater of the generator set in real time.

[0128] The determination module 204 is used to determine the target coal feeding rate of the target mill group based on the current wall temperature of the high-temperature superheater, the current coal feed rate, and the preset coal feeding rate.

[0129] The correction module 205 is used to correct the target coal feeding rate based on the current coal feed rate of each of the currently running mills.

[0130] The first control module 206 is used to control the coal feeder of the target mill to feed coal to the target mill based on the target coal feeding rate after correction processing;

[0131] The second control module 207 is used to control the coal feeder to stop feeding coal to the target mill in response to the current coal feed rate meeting the preset requirements.

[0132] The coal feeding control device for the sequential start-up process of a pulverizing system according to embodiments of this application, and the coal feeding control method for the sequential start-up process of a pulverizing system according to embodiments of this application, respectively acquire the maximum output value of the target mill group to be started, the number of currently operating mill groups, and the current coal feed rate of each currently operating mill group; based on the maximum output value and the number of currently operating mill groups, obtain the preset coal feeding rate of the target mill group; control the target mill group to start, and acquire the current coal feed rate of the mill group and the current wall temperature of the high-temperature superheater of the generator set in real time; determine the target coal feeding rate of the target mill group based on the current wall temperature of the high-temperature superheater, the current coal feed rate, and the preset coal feeding rate; correct the target coal feeding rate based on the current coal feed rate of each currently operating mill group; control the coal feeder of the target mill group to feed coal to the target mill group based on the corrected target coal feeding rate; and control the coal feeder to stop feeding coal to the target mill group in response to the current coal feed rate meeting the preset requirements. This achieves automatic start-up of the mill group, improves the accuracy of coal feeding rate control during the start-up process, and increases the efficiency of mill group start-up.

[0133] Figure 3This is a block diagram of an electronic device according to an embodiment of this application. For example... Figure 3 As shown, the electronic device may include: a transceiver 31, a processor 32, and a memory 33.

[0134] Processor 32 executes computer execution instructions stored in memory, causing processor 32 to perform the scheme in the above embodiments. Processor 32 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0135] The memory 33 is connected to the processor 32 via the system bus and completes communication between them. The memory 33 is used to store computer program instructions.

[0136] Transceiver 31 can be used to obtain the task to be run and its configuration information.

[0137] The system bus can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The system bus can be divided into address bus, data bus, control bus, etc. For ease of representation, only one thick line is used in the diagram, but this does not indicate that there is only one bus or one type of bus. Transceivers are used to enable communication between database access devices and other computers (e.g., clients, read-write libraries, and read-only libraries). Memory may include random access memory (RAM) and may also include non-volatile memory.

[0138] The electronic device provided in this application embodiment can be the terminal device described in the above embodiments.

[0139] This application also provides a chip for executing instructions, which is used to execute the message processing method described in the above embodiments.

[0140] This application also provides a computer-readable storage medium storing computer instructions that, when executed on a computer, cause the computer to perform the message processing method described in the above embodiments.

[0141] This application also provides a computer program product, which includes a computer program stored in a computer-readable storage medium. At least one processor can read the computer program from the computer-readable storage medium, and when the at least one processor executes the computer program, it can implement the technical solution of the message processing method in the above embodiments.

[0142] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0143] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A method for controlling coal feeding during the sequential start-up process of a pulverizing system, characterized in that, The method includes: The maximum output value of the target mill group to be started, the number of mill groups currently in operation, and the current coal feed rate of each of the currently operating mill groups are obtained respectively. Based on the maximum output value and the number of currently operating mill groups, the preset coal feeding rate of the target mill group is obtained; wherein, the preset coal feeding rate includes a first coal feeding rate, a second coal feeding rate, and a third coal feeding rate; wherein, the first coal feeding rate is less than the second coal feeding rate, and the second coal feeding rate is less than the third coal feeding rate; Control the target grinding group to start, and obtain the current coal feed rate of the grinding group and the current wall temperature of the high-temperature superheater of the generator set in real time; The target coal feeding rate of the target mill group is determined based on the current wall temperature of the high-temperature superheater, the current coal feed rate, and the preset coal feeding rate. The target coal feeding rate is corrected based on the current coal feed rate of each of the currently operating mills. The coal feeder of the target mill is controlled to feed coal to the target mill based on the target coal feeding rate after correction processing; In response to the current coal feed rate meeting the preset requirements, the coal feeder is controlled to stop feeding coal to the target mill. The step of determining the target coal feeding rate of the target mill based on the current wall temperature of the high-temperature superheater, the current coal feed rate, and the preset coal feeding rate includes: Based on the current wall temperature of the high-temperature superheater, determine the rate of change of the current wall temperature of the high-temperature superheater; In response to the current wall temperature of the high-temperature superheater being greater than or equal to a first preset threshold, and / or in response to the current wall temperature change rate of the high-temperature superheater being greater than or equal to a second preset threshold, the target coal feeding rate of the target mill group is determined to be the first coal feeding rate. In response to the current coal feed rate being less than a third preset threshold, the target coal feeding rate of the target mill is determined to be the third coal feeding rate. In response to the current wall temperature of the high-temperature superheater being less than the first preset threshold, the current wall temperature change rate of the high-temperature superheater being less than the second preset threshold, and the current coal feed rate being greater than or equal to the third preset threshold, the target coal feeding rate of the target mill is determined to be the second coal feeding rate. The step of correcting the target coal feeding rate based on the current coal feed rate of each of the currently operating mill units includes: Based on the current coal feed rate of each of the currently operating mill groups, determine the average coal feed rate of the currently operating mill groups; The correction coefficient is determined based on the average coal feed rate. Multiply the correction coefficient by the target coal feeding rate to obtain the corrected target coal feeding rate.

2. The method according to claim 1, characterized in that, The step of determining the target coal feeding rate of the target mill based on the current wall temperature of the high-temperature superheater, the current coal feed rate, and the preset coal feeding rate further includes: In response to the current wall temperature of the high-temperature superheater being greater than or equal to a first preset threshold, and / or in response to the current wall temperature change rate of the high-temperature superheater being greater than or equal to a second preset threshold, and the current coal feed rate being less than a third preset threshold, the target coal feeding rate of the target mill is determined to be the third coal feeding rate.

3. The method according to claim 1, characterized in that, The determination of the correction coefficient based on the average coal feed rate includes: In response to the average coal feed rate being less than or equal to the first preset coal feed rate, the correction coefficient is determined to be 0; In response to the average coal feed being greater than the first preset coal feed and less than the second preset coal feed, the correction coefficient is determined based on the first preset correction coefficient, the first preset threshold, and the second preset threshold; wherein the first preset coal feed is less than the second preset coal feed. In response to the average coal feed rate being greater than the second preset coal feed rate, the determined correction coefficient is determined to be the first preset correction coefficient.

4. The method according to claim 3, characterized in that, Determining the correction coefficient based on the first preset correction coefficient, the first preset threshold, and the second preset threshold includes: The first preset threshold is determined as the first horizontal coordinate, and 0 is determined as the first vertical coordinate to obtain the coordinates of the first target point. The second preset threshold is determined as the second horizontal coordinate, and the first preset correction coefficient is determined as the second vertical coordinate to obtain the coordinates of the second target point; Based on the coordinates of the first target point and the coordinates of the second target point, determine a linear function that passes through the coordinates of the first target point and the coordinates of the second target point; The correction coefficient is determined based on the linear function and the average coal feed rate.

5. The method according to claim 1, characterized in that, The step of controlling the coal feeder to stop feeding coal to the target mill unit in response to the current coal feed rate meeting the preset requirements includes: Based on the current coal feed rate of each of the currently operating mill units, determine the minimum coal carrying capacity; In response to the maximum output value of the target mill being greater than or equal to the minimum coal carrying capacity, the coal feeder is controlled to stop feeding coal to the target mill.

6. A coal feeding control device for the sequential start-up process of a pulverizing system, characterized in that, The apparatus, applicable to the method of any one of claims 1-5, comprises: The first acquisition module is used to acquire the maximum output value of the target mill group to be started, the number of mill groups currently running, and the current coal feed rate of each of the currently running mill groups. The second acquisition module is used to acquire the preset coal feeding rate of the target mill based on the maximum output value and the number of mills currently in operation; wherein the preset coal feeding rate includes a first coal feeding rate, a second coal feeding rate and a third coal feeding rate; wherein the first coal feeding rate is less than the second coal feeding rate, and the second coal feeding rate is less than the third coal feeding rate; The third acquisition module is used to control the start-up of the target grinding group and acquire the current coal feed rate of the grinding group and the current wall temperature of the high-temperature superheater of the generator set in real time. The determination module is used to determine the target coal feeding rate of the target mill based on the current wall temperature of the high-temperature superheater, the current coal feed rate, and the preset coal feeding rate. The correction module is used to correct the target coal feeding rate based on the current coal feed rate of each of the currently operating mills. The first control module is used to control the coal feeder of the target mill to feed coal to the target mill based on the target coal feeding rate after correction processing; The second control module is used to control the coal feeder to stop feeding coal to the target mill in response to the current coal feed rate meeting the preset requirements.

7. An electronic device, characterized in that, include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executed instructions; The processor executes computer execution instructions stored in the memory to implement the method as described in any one of claims 1-5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the method as described in any one of claims 1-5.

Images