Water-coal-air coordination optimization control method and device for variable load process of coal-fired unit

Abstract

The embodiment of the application provides a kind of coal-fired unit variable load process water-coal wind coordination optimization control method and device, belong to coal-fired power plant automatic control technical field.The method comprises: obtaining control instruction in the variable load process of coal-fired unit;Wherein, the control instruction includes: feedwater flow control instruction, coal supply amount control instruction, primary air volume control instruction and secondary air volume control instruction;The control instruction is not synchronized to be issued, so that the control instruction presents different progress order with the change of boiler load, and the progress order is: the progress order of secondary air volume, primary air volume, feedwater flow and coal supply amount.The method considers equipment delay and boiler heat storage characteristics, and corrects the control instruction of feedwater flow, coal supply amount, primary air volume and secondary air volume in the variable load process, transmits different boiler load instructions for different control instructions, changes original synchronous change, so that the variable load process is more smooth, and thermal control parameter is more stable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automatic control of coal-fired power plants, in particular to a water-coal-air coordinated optimization control method for a variable load process of a coal-fired unit, a water-coal-air coordinated optimization control device for a variable load process of a coal-fired unit, a machine-readable storage medium and a processor. BACKGROUND

[0002] Renewable energy has the characteristics of intermittency, periodicity, random fluctuation and regional limitation, and its grid connection brings new challenges to the safe and stable operation of the power grid. Coal-fired units frequently participate in the peak shaving task of the power grid and are in a variable load state for a long time, so it is necessary to fully tap and utilize the flexible operation capability of the thermal system of the coal-fired unit to alleviate the pressure brought by the grid connection of new energy. The control of the water supply, coal supply and air supply is the core of the coordinated control system of the coal-fired unit, and the control strategy will affect the stability of the thermal parameters and the load following property of the entire variable load process. Due to the large thermal inertia of the thermal system of the coal-fired unit, the parameter control effect is poor in the variable load process, the temperature and pressure fluctuate strongly, which affects the operation life and reliability of the unit, and even threatens the operation safety of the unit. Therefore, the water-coal-air coordinated control strategy needs to be optimized to improve the thermal control level of the variable load process of the coal-fired unit. SUMMARY

[0003] The purpose of the embodiments of the present application is to provide a water-coal-air coordinated optimization control method and device for a variable load process of a coal-fired unit. The method considers the equipment delay and the heat storage characteristics of the boiler, corrects the control instructions of the water supply flow, coal supply, primary air volume and secondary air volume in the variable load process, transmits different boiler load instructions for different control instructions, changes the original synchronous change, and makes the variable load process more smooth and the thermal control parameters more stable.

[0004] To achieve the above-mentioned purpose, the first aspect of the present application provides a water-coal-air coordinated optimization control method for a variable load process of a coal-fired unit, which comprises:

[0005] obtaining control instructions in a variable load process of a coal-fired unit; wherein the control instructions include water flow control instructions, coal supply control instructions, primary air volume control instructions and secondary air volume control instructions;

[0006] The control instructions are issued asynchronously, so that the control instructions change with different progress sequences according to the change of the boiler load, and the progress sequence is the progress sequence of the secondary air volume, the primary air volume, the water flow and the coal supply.

[0007] In the embodiments of the present application, the secondary air volume control instructions include:

[0008] F sa =f sa(L B )+f sa,d (B1,B2,B3…) (4);

[0009] In the formula, F sa This is a secondary air volume control command; f sa For secondary air volume control setpoint; f sa,d This is the correction value for secondary air volume control; L B For boiler load command; B i (i = 1, 2, 3...) represents the monitored boiler thermal parameters;

[0010] When a coal-fired power unit increases its load, the boiler load command issued to the secondary air volume control circuit is as follows:

[0011]

[0012] In the formula, K is the load increase rate, in MW / min; P0 is the initial load, in MW; P1 is the target load, in MW; and t represents time, in min.

[0013] In this embodiment of the application, the primary air volume control command includes:

[0014] F pa =f pa (L B )+f pa,d (B1,B2,B3…) (3);

[0015] In the formula, F pa This is a primary airflow control command; f pa This is the setpoint for primary air volume control; f pa,d This is the primary air volume control correction value; L B For boiler load command; B i (i = 1, 2, 3...) represents the monitored boiler thermal parameters;

[0016] When a coal-fired unit increases its load, the boiler load command issued to the primary air volume control circuit is as follows:

[0017]

[0018] In the formula, K is the load increase rate, in MW / min; P0 is the initial load, in MW; P1 is the target load, in MW; and t represents time, in min.

[0019] In this embodiment of the application, the water supply flow control command includes:

[0020] F fw =f fw (LB )+f fw,d (B1,B2,B3…) (1);

[0021] F = f (L) + f (B1,B2,B3…) (1); fw is the feed water flow control instruction; f fw is the feed water flow control set value; f fw,d is the feed water flow control correction value; L B is the boiler load instruction; B i (i = 1, 2, 3…) are the monitored boiler thermal parameters;

[0022] When the coal-fired unit is undergoing load increase, the boiler load instruction issued to the feed water flow control loop is:

[0023]

[0024] wherein K is the load increase rate, with the unit of MW / min; P0 is the initial load, with the unit of MW; P1 is the target load, with the unit of MW; and t represents time, with the unit of min.

[0025] In the embodiments of the present application, the coal feeding amount control instruction comprises:

[0026] F = f (L) + f (B1,B2,B3…) (1); c is the feed water flow control instruction; f c (L B )+f c,d (B1,B2,B3…) (2);

[0027] F = f (L) + f (B1,B2,B3…) (1); c is the feed water flow control instruction; f c is the feed water flow control set value; f c,d is the feed water flow control correction value; L B is the boiler load instruction; B i (i = 1, 2, 3…) are the monitored boiler thermal parameters;

[0028] When the coal-fired unit is undergoing load increase, the boiler load instruction issued to the feed water flow control loop is:

[0029]

[0030] wherein K is the load increase rate, with the unit of MW / min; P0 is the initial load, with the unit of MW; P1 is the target load, with the unit of MW; and t represents time, with the unit of min.

[0031] In the embodiments of the present application, when the coal-fired unit is undergoing load decrease, the boiler load instruction issued to the secondary air flow control loop is:

[0032]

[0033] In the formula, K is a load reduction rate, the unit is MW / min; P0 is an initial load, the unit is MW; P1 is a target load, the unit is MW; t represents time, the unit is min.

[0034] In the embodiment of the present application, when the coal-fired unit is in the process of load reduction, the boiler load instruction issued to the primary air flow control loop is:

[0035]

[0036] In the formula, K is a load reduction rate, the unit is MW / min; P0 is an initial load, the unit is MW; P1 is a target load, the unit is MW; t represents time, the unit is min.

[0037] In the embodiment of the present application, when the coal-fired unit is in the process of load reduction, the boiler load instruction issued to the primary air flow control loop is:

[0038]

[0039] In the formula, K is a load reduction rate, the unit is MW / min; P0 is an initial load, the unit is MW; P1 is a target load, the unit is MW; t represents time, the unit is min.

[0040] In the embodiment of the present application, when the coal-fired unit is in the process of load reduction, the boiler load instruction issued to the primary air flow control loop is:

[0041]

[0042] In the formula, K is a load reduction rate, the unit is MW / min; P0 is an initial load, the unit is MW; P1 is a target load, the unit is MW; t represents time, the unit is min.

[0043] The second aspect of the present application provides a coal-fired unit variable load process water-coal-air coordinated optimization control device, the device comprises:

[0044] An acquisition module is configured to acquire control instructions in a coal-fired unit variable load process; wherein the control instructions comprise: a feedwater flow control instruction, a coal feed amount control instruction, a primary air flow control instruction, and a secondary air flow control instruction;

[0045] An instruction issuing module is configured to issue the control instructions asynchronously, so that the control instructions present different progress sequences with the change of the boiler load, and the progress sequence is: the progress sequence of the secondary air flow, the primary air flow, the feedwater flow, and the coal feed amount.

[0046] The third aspect of the present application provides a processor configured to execute the above-mentioned coal-fired unit variable load process water-coal-air coordinated optimization control method.

[0047] The fourth aspect of the present application provides a machine readable storage medium, which stores instructions, and the instructions, when executed by a processor, cause the processor to be configured to perform the coal-fired unit variable load process water-coal-air coordinated optimization control method.

[0048] Compared with the prior art, the above technical solution of the present application has the following beneficial effects:

[0049] The present application provides a coal-fired unit variable load process water-coal-air coordinated optimization control method and device, which considers equipment delay and boiler heat storage characteristics, corrects the control instructions of feed water flow, coal supply amount, primary air volume and secondary air volume in the variable load process, transmits different boiler load instructions for different control instructions, changes the original synchronous change, so that the variable load process is smoother and the thermal control parameters are more stable.

[0050] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0051] The accompanying drawings are used to provide a further understanding of the embodiments of the present application, and constitute a part of the specification, and are used to explain the embodiments of the present application together with the following specific embodiments, but do not constitute a limitation of the embodiments of the present application. In the drawings:

[0052] Figure 1 The application environment schematic diagram of the coal-fired unit variable load process water-coal-air coordinated optimization control method according to the embodiments of the present application is schematically shown;

[0053] Figure 2 The flowchart of the coal-fired unit variable load process water-coal-air coordinated optimization control method according to the embodiments of the present application is schematically shown;

[0054] Figure 3 The boiler load instruction change trend graph in the variable load process according to the embodiments of the present application is schematically shown;

[0055] Figure 4 The structure block diagram of the coal-fired unit variable load process water-coal-air coordinated optimization control device according to the embodiments of the present application is schematically shown;

[0056] Figure 5 The internal structure diagram of the computer device according to the embodiments of the present application is schematically shown. DETAILED DESCRIPTION

[0057] The thermal inertia of the thermal system of the coal-fired unit and the delay of the start-stop process of the equipment are key problems restricting the variable load rate of the coal-fired power plant. In the initial variable load stage of the coal-fired power plant, if the coal supply and water supply are rapidly changed, the boiler efficiency will inevitably decrease, the steam-water parameters will be unstable, and the control effect will be poor. Moreover, due to the existence of a certain amount of "coal storage" in the coal pulverizing system, the heat storage state of the unit can be gradually changed by changing the air volume in the initial variable load process, and the coal supply and water supply can be more smoothly changed thereafter. Therefore, the control instructions of water, coal and air are changed to be non-synchronous in the embodiment, so that the thermal state is more smoothly transitioned in the variable load process, and the control effect of the thermal parameters is improved.

[0058] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. It should be understood that the specific implementation manners described herein are only used to illustrate and explain the embodiments of the present application, and are not used to limit the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0059] It should be noted that if the description of "first", "second", and the like is involved in the embodiments of the present application, the description of "first", "second", and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize it, and when the combination of technical solutions appears to be contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection claimed by the present application.

[0060] The coal-fired unit variable load process water-coal-air coordinated optimization control method provided by the present application can be applied to the application environment as shown in Figure 1 The terminal 102 communicates with the server 104 through the network. The terminal 102 can be, but is not limited to, various personal computers, notebook computers, smart phones, tablet computers, and portable wearable devices, and the server 104 can be implemented by an independent server or a server cluster composed of multiple servers.

[0061] Figure 2 The flowchart of the coal-fired unit variable load process water-coal-air coordinated optimization control method according to the embodiments of the present application is schematically shown. As shown in Figure 2As shown, in one embodiment of this application, a method for coordinated optimization control of water, coal, and air during variable load processes in a coal-fired unit is provided. This embodiment mainly applies this method to the above-mentioned... Figure 1 Taking terminal 102 (or server 104) as an example, the following steps are included:

[0062] Step 110: Obtain control commands during the load change process of the coal-fired unit; wherein, the control commands include: water flow control command, coal feed control command, primary air volume control command, and secondary air volume control command.

[0063] In the boiler-generator coordinated control system of a coal-fired power unit, the control commands for feedwater flow, coal feed, primary air volume, and secondary air volume during load changes are calculated from the boiler load command to obtain setpoints, and from deviations in real-time boiler operating parameters (such as steam-water separator outlet temperature, main steam temperature, and main steam pressure) to obtain correction values. The setpoints are only related to the boiler commands.

[0064] In this embodiment, the water supply flow control command is written as:

[0065] F fw =f fw (L B )+f fw,d (B1,B2,B3…) (1);

[0066] In the formula, F fw For water supply flow control commands, f fw f is the setpoint for water supply flow control. fw,d For water supply flow control correction value; L B For boiler load command; B i (i = 1, 2, 3...) represents the various boiler thermal parameters being monitored.

[0067] The coal feed control command is written as: F c =f c (L B )+f c,d (B1,B2,B3…) (2);

[0068] In the formula, F c For coal feed rate control commands; f c This is the setpoint for coal feed rate control; f c,d This is the correction value for coal feed rate control; L B For boiler load command; B i (i = 1, 2, 3...) represents the various boiler thermal parameters being monitored.

[0069] The primary air volume control command is written as: F pa =f pa (L B)+f pa,d (B1,B2,B3…) (3);

[0070] In the formula, F pa This is a primary airflow control command; f pa This is the setpoint for primary air volume control; f pa,d This is the primary air volume control correction value; L B For boiler load command; B i (i = 1, 2, 3...) represents the various boiler thermal parameters being monitored.

[0071] The secondary air volume control command is written as: F sa =f sa (L B )+f sa,d (B1,B2,B3…) (4);

[0072] In the formula, F sa This is a secondary air volume control command; f sa For secondary air volume control setpoint; f sa,d This is the correction value for secondary air volume control; L B For boiler load command; B i (i = 1, 2, 3...) represents the various boiler thermal parameters being monitored.

[0073] Step 120: The control commands are issued asynchronously, so that the control commands present different progress sequences as the boiler load changes. The progress sequence is: secondary air volume, primary air volume, feedwater flow rate, and coal feed rate.

[0074] f under steady-state operating conditions fw,d f c,d f pa,d and f sa,d All are zero. In this embodiment, the boiler load command L is transmitted to the four controlled variables (feedwater flow control command, coal feed control command, primary air volume control command, and secondary air volume control command) obtained in step 110 during the load change process. B The different values ​​result in the four controlled variables having different progress sequences as the boiler load changes, namely secondary air volume, primary air volume, feedwater flow rate, and coal feed rate.

[0075] In this embodiment, when the coal-fired unit is about to undergo a load increase process, with a load increase rate of K (MW / min), an initial load of P0 (MW), and a target load of P1 (MW), the boiler load command transmitted to the secondary air volume control loop is as follows:

[0076]

[0077] Wherein, t represents time, unit is min, zero point is starting point of variable load process, maximum value is (P1-P0) / K.

[0078] When the unit is about to carry out the load increasing process, the boiler load instruction conveyed to the primary air flow control loop is:

[0079]

[0080] When the unit is about to carry out the load increasing process, the boiler load instruction conveyed to the primary air flow control loop is:

[0081]

[0082] When the unit is about to carry out the load increasing process, the boiler load instruction conveyed to the primary air flow control loop is:

[0083]

[0084] When the unit is about to carry out the load decreasing process, the boiler load instruction conveyed to the secondary air flow control loop is:

[0085]

[0086] When the unit is about to carry out the load decreasing process, the boiler load instruction conveyed to the primary air flow control loop is:

[0087]

[0088] When the unit is about to carry out the load decreasing process, the boiler load instruction conveyed to the primary air flow control loop is:

[0089]

[0090] When the unit is about to carry out the load decreasing process, the boiler load instruction conveyed to the primary air flow control loop is:

[0091]

[0092] When the unit is in an incomplete load change process, and the target load changes, the new target load is taken as P1, the current transmitted boiler load instruction L B is taken as the initial load, and the time t is reset, and the boiler load instruction in the new load change process is recalculated.

[0093] The method described in the embodiment takes into account the heat storage of the boiler system and the delay of the equipment operation, and realizes smooth transition in the load change. The stability of the thermal parameter control in the load change process of the coal-fired unit is improved. The steam parameter fluctuation is reduced, the safety is improved, and the service life of the equipment is prolonged.

[0094] Figure 2 Fig. 1 is a flowchart of a method for water-coal-wind coordinated optimization control in a load change process of a coal-fired unit in an embodiment. It should be understood that although the steps in the flowchart are shown in sequence according to the arrows, the steps are not necessarily executed in sequence according to the arrows. Unless otherwise specified in this document, the execution of the steps is not strictly limited in sequence, and the steps can be executed in other sequences. Moreover, Figure 2 at least part of the steps in the flowchart can include multiple sub-steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution sequence of the sub-steps or stages is not necessarily sequential, but can be executed in rotation or alternation with at least part of other steps or sub-steps or stages of other steps. Figure 2

[0095] Figure 3 Fig. 2 schematically shows a trend chart of the change of the boiler load instruction in the load change process according to the embodiment of the present application. In the embodiment, the load change time and the boiler load instruction are normalized and dimensionless, and the change trends of the secondary air volume, the primary air volume, the feedwater flow, and the coal feed are obtained, as shown in Fig. 2. The method takes into account the thermal inertia and equipment delay of the coal-fired power plant, changes the originally synchronous feedwater flow, coal feed, and air volume control instructions, and first changes the heat storage state of the unit by changing the air volume at the beginning of the load change process, further smoothly transitions the coal feed and the feedwater flow, and can maintain the stability of the thermal parameters in the load change process, and improve the load change performance of the coal-fired unit. Figure 3

[0096] In an embodiment, as shown in Fig. 3, a device for water-coal-wind coordinated optimization control in a load change process of a coal-fired unit is provided, which includes an acquisition module 210 and an instruction issuing module 220, wherein: Figure 4

[0097] ​​​The acquisition module 210 is configured to acquire a control instruction in a variable load process of a coal-fired unit; wherein the control instruction comprises a feedwater flow control instruction, a coal feed amount control instruction, a primary air volume control instruction, and a secondary air volume control instruction.

[0098] The instruction issuing module 220 is configured to issue the control instruction asynchronously, so that the control instruction presents different progress sequences with the change of the boiler load, and the progress sequence is: the secondary air volume, the primary air volume, the feedwater flow, and the coal feed amount.

[0099] The water-coal-wind coordinated optimization control device for the variable load process of the coal-fired unit comprises a processor and a memory, the acquisition module 210 and the instruction issuing module 220 are stored in the memory as program units, and the corresponding functions are realized by the processor executing the program modules stored in the memory.

[0100] The processor comprises a core, and the core calls the corresponding program units from the memory. The core can be one or more, and the water-coal-wind coordinated optimization control method for the variable load process of the coal-fired unit is realized by adjusting the core parameters.

[0101] The memory can comprise a non-permanent memory in a computer readable medium, a random access memory (RAM), and / or a non-volatile memory such as a read-only memory (ROM) or a flash memory (flash RAM), and the memory comprises at least one memory chip.

[0102] The embodiment of the present application provides a storage medium, which stores a program, and the program is executed by a processor to realize the water-coal-wind coordinated optimization control method for the variable load process of the coal-fired unit.

[0103] In one embodiment, a computer device is provided, which can be a terminal, and an internal structure diagram of the computer device can be as shown in Figure 5As shown in the figure. The computer device includes a processor A01, a network interface A02, a display screen A04, an input device A05 and a memory (not shown in the figure) connected through a system bus. Among them, the processor A01 of the computer device is used to provide computing and control capabilities. The memory of the computer device includes an internal memory A03 and a non-volatile storage medium A06. The non-volatile storage medium A06 stores an operating system B01 and a computer program B02. The internal memory A03 provides an environment for the operating system B01 and the computer program B02 in the non-volatile storage medium A06 to run. The network interface A02 of the computer device is used to communicate with the external terminal through the network connection. The computer program is executed by the processor A01 to implement a coal-fired unit variable load process water-coal-air coordination optimization control method. The display screen A04 of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input device A05 of the computer device can be a touch layer overlaid on the display screen, or a key, trackball or touchpad arranged on the shell of the computer device, or an external keyboard, touchpad or mouse, etc.

[0104] Those skilled in the art can understand that, Figure 5 The structure shown in the figure is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the computer device to which the scheme of the present application is applied. The specific computer device can include more or fewer components than those shown in the figure, or combine certain components, or have a different component arrangement.

[0105] In one embodiment, the coal-fired unit variable load process water-coal-air coordination optimization control device provided by the present application can be implemented in the form of a computer program, which can run on a computer device as shown in the figure. Figure 5 The memory of the computer device can store various program modules constituting the coal-fired unit variable load process water-coal-air coordination optimization control device, such as the acquisition module 210 and the instruction issuing module 220 shown in the figure. The computer program composed of various program modules enables the processor to execute the steps in the coal-fired unit variable load process water-coal-air coordination optimization control method of each embodiment of the present application described in the specification. Figure 4

[0106] Figure 5 The computer device can execute step 110 through the acquisition module 210 in the coal-fired unit variable load process water-coal-air coordination optimization control device as shown in the figure. Figure 4 The computer device can execute step 220 through the instruction issuing module 220.

[0107] The present application provides a device, which comprises a processor, a memory and a program stored in the memory and executable on the processor. When the processor executes the program, the following steps are implemented.​

[0108] In step 110, control instructions in the variable load process of the coal-fired unit are acquired; wherein the control instructions include: feedwater flow control instructions, coal supply amount control instructions, primary air volume control instructions and secondary air volume control instructions.

[0109] In step 120, the control instructions are issued asynchronously, so that the control instructions present different progress sequences with the change of the boiler load, and the progress sequence is: secondary air volume, primary air volume, feedwater flow and coal supply amount.

[0110] In one embodiment, the secondary air volume control instructions include:

[0111] F sa = f sa (L B )+ f sa,d (B1, B2, B3…) (4);

[0112] In the formula, F sa is the secondary air volume control instruction; f sa is the secondary air volume control set value; f sa,d is the secondary air volume control correction value; L B is the boiler load instruction; and B i (i = 1, 2, 3…) is each monitored boiler thermal parameter.

[0113] When the coal-fired unit is in the process of increasing load, the boiler load instruction issued to the secondary air volume control loop is:

[0114]

[0115] In the formula, K is the increasing load rate, with the unit of MW / min; P0 is the initial load, with the unit of MW; P1 is the target load, with the unit of MW; and t represents time, with the unit of min.

[0116] In one embodiment, the primary air volume control instructions include:

[0117] F pa = f pa (L B )+ f pa,d (B1, B2, B3…) (3);

[0118] In the formula, F pa is the primary air volume control instruction; f pa is the primary air volume control set value; f pa,d is the primary air volume control correction value; L B is the boiler load instruction; and B iB (i=1, 2, 3…) are the monitored boiler thermal parameters;

[0119] When the coal-fired unit is in the process of increasing load, the boiler load instruction given to the primary air flow control loop is:

[0120]

[0121] In the formula, K is the increasing load rate, the unit is MW / min; P0 is the initial load, the unit is MW; P1 is the target load, the unit is MW; t represents time, the unit is min.

[0122] In one embodiment, the feedwater flow control instruction comprises:

[0123] F fw = f fw (L B )+ f fw,d (B1, B2, B3…) (1);

[0124] In the formula, F fw is the feedwater flow control instruction; f fw is the feedwater flow control set value; f fw,d is the feedwater flow control correction value; L B is the boiler load instruction; B i (i=1, 2, 3…) are the monitored boiler thermal parameters;

[0125] When the coal-fired unit is in the process of increasing load, the boiler load instruction given to the primary air flow control loop is:

[0126]

[0127] In the formula, K is the increasing load rate, the unit is MW / min; P0 is the initial load, the unit is MW; P1 is the target load, the unit is MW; t represents time, the unit is min.

[0128] In one embodiment, the coal feed amount control instruction comprises:

[0129] F c = f c (L B )+ f c,d (B1, B2, B3…) (2);

[0130] In the formula, F c is the coal feed amount control instruction; f c is the coal feed amount control set value; f c,d is the coal feed amount control correction value; L B is the boiler load instruction; B i(i = 1, 2, 3…) are the monitored thermal parameters of the boiler;

[0131] When the coal-fired unit is in the process of increasing load, the boiler load instruction issued to the coal feed control loop is:

[0132]

[0133] wherein K is the increasing load rate, with the unit of MW / min; P0 is the initial load, with the unit of MW; P1 is the target load, with the unit of MW; and t represents time, with the unit of min.

[0134] In one embodiment, when the coal-fired unit is in the process of decreasing load, the boiler load instruction issued to the secondary air volume control loop is:

[0135]

[0136] wherein K is the decreasing load rate, with the unit of MW / min; P0 is the initial load, with the unit of MW; P1 is the target load, with the unit of MW; and t represents time, with the unit of min.

[0137] In one embodiment, when the coal-fired unit is in the process of decreasing load, the boiler load instruction issued to the primary air volume control loop is:

[0138]

[0139] wherein K is the decreasing load rate, with the unit of MW / min; P0 is the initial load, with the unit of MW; P1 is the target load, with the unit of MW; and t represents time, with the unit of min.

[0140] In one embodiment, when the coal-fired unit is in the process of decreasing load, the boiler load instruction issued to the feed water flow control loop is:

[0141]

[0142] wherein K is the decreasing load rate, with the unit of MW / min; P0 is the initial load, with the unit of MW; P1 is the target load, with the unit of MW; and t represents time, with the unit of min.

[0143] In one embodiment, when the coal-fired unit is in the process of decreasing load, the boiler load instruction issued to the coal feed control loop is:

[0144]

[0145] wherein K is the decreasing load rate, with the unit of MW / min; P0 is the initial load, with the unit of MW; P1 is the target load, with the unit of MW; and t represents time, with the unit of min.

[0146] In one embodiment, when the unit is in an ongoing load change process, and the target load is changed, the new target load is taken as P1, the current transmitted boiler load command L B as the initial load, and the time t is reset, the boiler load command in the new load change process is recalculated.

[0147] Those skilled in the art will understand that embodiments of the present application can be provided as methods, systems, or computer program products. Accordingly, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application can take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage devices, etc.) embodying computer readable program code.

[0148] The present application is described in reference to the flowchart and / or block diagrams of the methods, apparatus (systems) and computer program products according to embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagrams, and combinations of flows and / or blocks in the flowchart and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more flows and / or blocks Figure 1 means for carrying out the functions specified in the flowchart and / or block diagram block or blocks.

[0149] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions means which implement the function specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more flows and / or blocks Figure 1 means for carrying out the functions specified in the flowchart and / or block diagram block or blocks.

[0150] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more flows and / or blocks Figure 1 means for carrying out the functions specified in the flowchart and / or block diagram block or blocks.

[0151] In one typical arrangement, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0152] Memory can include non-persistent memory and / or volatile memory, such as random access memory (RAM) about which the computer stores the information. Memory is an example of computer readable media.

[0153] Computer readable media includes permanent and non-permanent, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read only memory (ROM), electrically erasable programmable read only memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital versatile disc (DVD), or other optical storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible to a computing device. According to the definition herein, computer readable media does not include transitory media, such as modulated data signals and carrier waves.

[0154] It should also be noted that the terms "comprising", "containing", or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article or apparatus that comprises a list of elements does not include only those elements in the list, but can also include other elements not expressly listed or inherent to such process, method, article or apparatus. Without further limitation, an element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or apparatus that includes the element.

[0155] The above merely provides an embodiment of the present application and is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the scope of claims of the present application.

Claims

1. A method for coordinated optimization control of water-coal-air in a variable load process of a coal-fired unit, characterized in that, The method comprises: obtaining control instructions in a variable load process of a coal-fired unit; wherein the control instructions comprise: feedwater flow control instructions, coal supply amount control instructions, primary air volume control instructions and secondary air volume control instructions; the control instructions are issued asynchronously, so that the control instructions present different progress sequences with changes in boiler load, and the progress sequence is: the progress sequence of secondary air volume, primary air volume, feedwater flow and coal supply amount; The primary air quantity control instruction comprises: (3); In the formula, F pa is the primary air volume control instruction; f pa is the primary air volume control set value; f pa,d is the primary air volume control correction value; L B is the boiler load instruction; B i (i=1,2,3…) are the monitored boiler thermal parameters; The secondary air amount control instruction includes: (4); wherein, F sa is the secondary air flow control instruction; f sa is the secondary air flow control set value; f sa,d is the secondary air flow control correction value; L B is the boiler load instruction; B i (i = 1, 2, 3...) are the monitored boiler thermal parameters.

2. The method of claim 1, wherein, when the coal-fired unit is in an ascending load process, the boiler load instruction issued to the secondary air volume control loop is: (5)； wherein K is the ramp-up rate in MW / min; P 0 is the initial load in MW; P 1 is the target load in MW; t represents time, in min.

3. The method of claim 1, wherein, when the coal-fired unit is in an ascending load process, the boiler load instruction issued to the primary air volume control loop is: (6)； wherein K is the ramp-up rate in MW / min; P 0 is the initial load in MW; P 1 is the target load in MW; t represents time, in min.

4. The method of claim 1, wherein, The water supply flow control instruction includes: (1); wherein, F fw is a feed water flow control command; f fw is a feed water flow control set value; f fw,d is a feed water flow control correction value; L B is a boiler load command; B i (i = 1, 2, 3...) are each monitored boiler thermal parameters; when the coal-fired unit is in an ascending load process, the boiler load instruction issued to the feedwater flow control loop is: (7)； wherein K is the ramp-up rate in MW / min; P 0 is the initial load in MW; P 1 is the target load in MW; t denotes time in min.

5. The method of claim 1, wherein, The coal supply amount control instruction includes: (2); wherein, F c is the coal feed control instruction; f c is the coal feed control set value; f c,d is the coal feed control correction value; L B is the boiler load instruction; B i (i = 1, 2, 3...) are the monitored thermal parameters of the boiler. when the coal-fired unit is in an ascending load process, the boiler load instruction issued to the coal supply amount control loop is: (8)； wherein K is the ramp-up rate in MW / min; P 0 is the initial load in MW; P 1 is the target load in MW; t denotes time in min.

6. The method of claim 2, wherein, when the coal-fired unit is in a descending load process, the boiler load instruction issued to the secondary air volume control loop is: (9)； wherein K is the ramp-down rate, in MW / min; P 0 is the initial load, in MW; P 1 is the target load, in MW; t represents time, in min.

7. The method of claim 3, wherein, when the coal-fired unit is in a descending load process, the boiler load instruction issued to the primary air volume control loop is: (10)； wherein K is the ramp-down rate, in MW / min; P 0 is the initial load, in MW; P 1 is the target load, in MW; t represents time, in min.

8. The method of claim 4, wherein, when the coal-fired unit is in a descending load process, the boiler load instruction issued to the feedwater flow control loop is: (11)； wherein K is the ramp-down rate, in MW / min; P 0 is the initial load, in MW; P 1 is the target load, in MW; t represents time, in min.

9. The method of claim 5, wherein, when the coal-fired unit is in a descending load process, the boiler load instruction issued to the coal supply amount control loop is: (12)； wherein K is the ramp-down rate, in MW / min; P 0 is the initial load, in MW; P 1 is the target load, in MW; t represents time, in min.

10. A device for coordinated optimization control of coal-fired unit variable load process and coal wind, characterized in that, The device comprises: an obtaining module, configured to obtain control instructions in a variable load process of a coal-fired unit; wherein the control instructions comprise: feedwater flow control instructions, coal supply amount control instructions, primary air volume control instructions and secondary air volume control instructions; an instruction issuing module, configured to issue the control instructions asynchronously, so that the control instructions present different progress sequences with changes in boiler load, and the progress sequence is: the progress sequence of secondary air volume, primary air volume, feedwater flow and coal supply amount; The primary air quantity control instruction comprises: (3); wherein, F pa is the primary air flow control instruction; f pa is the primary air flow control set value; f pa,d is the primary air flow control correction value; L B is the boiler load instruction; B i (i = 1, 2, 3...) are the monitored boiler thermal parameters; The secondary air amount control instruction includes: (4); wherein, F sa is the secondary air flow control instruction; f sa is the secondary air flow control set value; f sa,d is the secondary air flow control correction value; L B is the boiler load instruction; B i (i = 1, 2, 3...) are the monitored boiler thermal parameters.

11. A processor, comprising: configured to perform the variable load process water-coal-wind coordinated optimization control method of the coal-fired unit according to any one of claims 1 to 9.

12. A machine-readable storage medium having stored thereon instructions, the instructions being executable by a machine to cause the machine to: The instructions, when executed by a processor, cause the processor to be configured to perform the variable load process water-coal-wind coordinated optimization control method of the coal-fired unit according to any one of claims 1 to 9.

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